Patent Grant
12121592
This instant application contains a Sequence Listing which has been submitted electronically in ASCII format and is hereby incorporated by reference in its entirety. Said ASCII copy, created on Jun. 3. 2022, is named MRT-1055US17_ST25.txt and is 11 KB in size. No new matter is hereby added.
Novel approaches and therapies are still needed for the treatment of protein and enzyme deficiencies. For example, lysosomal storage diseases are a group of approximately 50 rare inherited metabolic disorders that result from defects in lysosomal function, usually due to a deficiency of an enzyme required for metabolism. Fabry disease is a lysosomal storage disease that results from a deficiency of the enzyme alpha galactosidase (GLA), which causes a glycolipid known as globotriaosylceramide to accumulate in blood vessels and other tissues, leading to various painful manifestations. For certain diseases, like Fabry disease, there is a need for replacement of a protein or enzyme that is normally secreted by cells into the blood stream. Therapies, such as gene therapy, that increase the level or production of an affected protein or enzyme could provide a treatment or even a cure for such disorders. However, there have been several limitations to using conventional gene therapy for this purpose.
Conventional gene therapy involves the use of DNA for insertion of desired genetic information into host cells. The DNA introduced into the cell is usually integrated to a certain extent into the genome of one or more transfected cells, allowing for long-lasting action of the introduced genetic material in the host. While there may be substantial benefits to such sustained action, integration of exogenous DNA into a host genome may also have many deleterious effects. For example, it is possible that the introduced DNA will be inserted into an intact gene, resulting in a mutation which impedes or even totally eliminates the function of the endogenous gene. Thus, gene therapy with DNA may result in the impairment of a vital genetic function in the treated host, such as e.g., elimination or deleteriously reduced production of an essential enzyme or interruption of a gene critical for the regulation of cell growth, resulting in unregulated or cancerous cell proliferation. In addition, with conventional DNA based gene therapy it is necessary for effective expression of the desired gene product to include a strong promoter sequence, which again may lead to undesirable changes in the regulation of normal gene expression in the cell. It is also possible that the DNA based genetic material will result in the induction of undesired anti-DNA antibodies, which in turn, may trigger a possibly fatal immune response. Gene therapy approaches using viral vectors can also result in an adverse immune response. In some circumstances, the viral vector may even integrate into the host genome. In addition, production of clinical grade viral vectors is also expensive and time consuming. Targeting delivery of the introduced genetic material using viral vectors can also be difficult to control. Thus, while DNA based gene therapy has been evaluated for delivery of secreted proteins using viral vectors (U.S. Pat. No. 6,066,626; US2004/0110709), these approaches may be limited for these various reasons.
Another obstacle apparent in these prior approaches at delivery of nucleic acids encoding secreted proteins, is in the levels of protein that are ultimately produced. It is difficult to achieve significant levels of the desired protein in the blood, and the amounts are not sustained over time. For example, the amount of protein produced by nucleic acid delivery does not reach normal physiological levels, See e.g., US2004/0110709.
In contrast to DNA, the use of RNA as a gene therapy agent is substantially safer because (1) RNA does not involve the risk of being stably integrated into the genome of the transfected cell, thus eliminating the concern that the introduced genetic material will disrupt the normal functioning of an essential gene, or cause a mutation that results in deleterious or oncogenic effects; (2) extraneous promoter sequences are not required for effective translation of the encoded protein, again avoiding possible deleterious side effects; (3) in contrast to plasmid DNA (pDNA), messenger RNA (mRNA) is devoid of immunogenic CpG motifs so that anti-RNA antibodies are not generated; and (4) any deleterious effects that do result from mRNA based on gene therapy would be of limited duration due to the relatively short half-life of RNA. In addition, it is not necessary for mRNA to enter the nucleus to perform its function, while DNA must overcome this major barrier.
One reason that mRNA based gene therapy has not been used more in the past is that mRNA is far less stable than DNA, especially when it reaches the cytoplasm of a cell and is exposed to degrading enzymes. The presence of a hydroxyl group on the second carbon of the sugar moiety in mRNA causes merle hinderance that prevents the mRNA from forming the more stable double helix structure of DNA and thus makes the mRNA more prone to hydrolytic degradation. As a result, until recently, it was widely believed that mRNA was too labile to withstand transfection protocols. Advances in RNA stabilizing modifications have sparked more interest in the use of mRNA in place of plasmid DNA in gene therapy. Certain delivery vehicles, such as cationic lipid or polymer delivery vehicles may also help protect the transfected mRNA from endogenous RNases. Yet, in spite of increased stability of modified mRNA, delivery of mRNA to cells in vivo in a manner allowing for therapeutic levels of protein production is still a challenge, particularly for mRNA encoding full length proteins. While delivery of mRNA encoding secreted proteins has been contemplated (US2009/0286852), the levels of a full length secreted protein that would actually be produced via in vivo mRNA delivery are not known and there is not a reason to expect the levels would exceed those observed with DNA based gene therapy.
To date, significant progress using mRNA gene therapy has only been made in applications for which low levels of translation has not been a limiting factor, such as immunization with mRNA encoding antigens. Clinical trials involving vaccination against tumor antigens by intradermal injection of naked or protamine-complexed mRNA have demonstrated feasibility, lack of toxicity, and promising results. X. Su et al., Mol. Pharmaceutics 8:774-787 (2011). Unfortunately, low levels of translation has greatly restricted the exploitation of mRNA based gene therapy in other applications which require higher levels of sustained expression of the mRNA encoded protein to exert a biological or therapeutic effect.
The invention provides methods for delivery of mRNA gene therapeutic agents that lead to the production of therapeutically effective levels of secreted proteins via a “depot effect.” In embodiments of the invention, mRNA encoding a secreted protein is loaded in lipid nanoparticles and delivered to target cells in vivo. Target cells then act as a depot source for production of soluble, secreted protein into the circulatory system at therapeutic levels. In some embodiments, the levels of secreted protein produced are above normal physiological levels.
The invention provides compositions and methods for intracellular deliver of mRNA in a liposomal transfer vehicle to one or more target cells for production of therapeutic levels of secreted functional protein.
The compositions and methods of the invention are useful in the management and treatment of a large number of diseases, in particular diseases which result from protein and/or enzyme deficiencies, wherein the protein or enzyme is normally secreted. Individuals suffering from such diseases may have underlying genetic defects that lead to the compromised expression of a protein, or enzyme, including, for example, the non-synthesis of the secreted protein, the reduced synthesis of the secreted protein, or synthesis of a secreted protein lacking or having diminished biological activity. In particular, the methods and compositions of the invention are useful for the treatment of lysosomal storage disorders and/or the urea cycle metabolic disorders that occur as a result of one or more defects in the biosynthesis of secreted enzymes involved in the urea cycle.
The compositions of the invention comprise an mRNA, a transfer vehicle and, optionally, an agent to facilitate contact with, and subsequent transfection of a target cell. The mRNA can encode a clinically useful secreted protein. For example, the mRNA may encode a functional secreted urea cycle enzyme or a secreted enzyme implicated in lysosomal storage disorders. The mRNA can encode, for example, erythropoietin (e.g., human EPO) or α-gatactosidase (e.g. human α-galactosidase (human GLA).
In some embodiments the mRNA can comprise one or more modifications that confer stability to the mRNA (e.g., compared to a wild-type or native version of the mRNA) and may also comprise one or more modifications relative to the wild-type which correct a defect implicated in the associated aberrant expression of the protein. For example, the nucleic acids of the present invention may comprise modifications to one or both of the 5′ and 3′ untranslated regions. Such modifications may include, but are not limited to, the inclusion of a partial sequence of a cytomegalovirus (CMV) immediate-early 1 (IE1) gene, a poly A tail, a Cap1 structure or a sequence encoding human growth hormone (hGH)). In some embodiments, the mRNA is modified to decrease mRNA immunogenecity.
Methods of treating a subject comprising administering a composition of the invention, are also contemplated. For example, methods of treating or preventing conditions in which production of a particular secreted protein and/or utilization of a particular secreted protein is inadequate or compromised are provided. In one embodiment, the methods provided herein can be used to treat a subject having a deficiency in one or more urea cycle enzymes or in one or more enzymes deficient in a lysosomal storage disorder.
In a preferred embodiment, the mRNA in the compositions of the invention is formulated in a liposomal transfer vehicle to facilitate delivery to the target cell. Contemplated transfer vehicles may comprise one or more cationic lipids, non-cationic lipids, and/or PEG-modified lipids. For example, the transfer vehicle may comprise at least one of the following cationic lipids: C12-200, DLin-KC2-DMA, DODAP, HGT4003, ICE, HGT5000, or HGT5001. In embodiments, the transfer vehicle comprises cholesterol (chol) and/or a PEG-modified lipid. In some embodiments, the transfer vehicles comprises DMG-PEG2K. In certain embodiments, the transfer vehicle comprises one of the following lipid formulations: C12-200, DOPE, chol, DMG-PEG2K; DODAP, DOPE, cholesterol, DMG-PEG2K; HGT5000, DOPE, chol, DMG-PEG2K, HGT5001, DOPE, chol, DMG-PEG2K.
The invention also provides compositions and methods useful for facilitating the transfection and delivery of one or more mRNA molecules to target cells capable of exhibiting the “depot effect.” For example, the compositions and methods of the present invention contemplate the use of targeting ligands capable of enhancing the affinity of the composition to one or more target cells. In one embodiment, the targeting ligand is apolipoprotein-B or apolipoprotein-E and corresponding target cells express low-density lipoprotein receptors, thereby facilitating recognition of the targeting ligand. The methods and compositions of the present invention may be used to preferentially target a vast number of target cells. For example, contemplated target cells include, but are not limited to, hepatocytes, epithelial cells, hematopoietic cells, epithelial cells, endothelial cells, lung cells, bone cells, stem cells, mesenchymal cells, neural cells, cardiac cells, adipocytes, vascular smooth muscle cells, cardiomyocytes, skeletal muscle cells, beta cells, pituitary cells, synovial lining cells, ovarian cells, testicular cells, fibroblasts, B cells, T cells, reticulocytes, leukocytes, granulocytes and tumor cells.
In embodiments, the secreted protein is produced by the target cell for sustained amounts of time. For example, the secreted protein may be producted for more than one hour, more than four, more than six, more than 12, more than 24, more than 48 hours, or more than 72 hours after administration. In some embodiments the polypeptide is expressed at a peak level about six hours after administration. In some embodiments the expression of the polypeptide is sustained at least at a therapeutic level. In some embodiments the polypeptide is expressed at at least a therapeutic level for more than one, more than four, more than six, more than 12, more than 24, more than 48 hours, or more than 72 hours after administration. In some embodiments the polypeptide is detectable at the level in patient serum or tissue (e.g., liver, or lung). In some embodiments, the level of detectable polypeptide is from continuous expression from the mRNA composition over periods of time of more than one, more than four, more than six, more than 12, more than 24, more than 48 hours, or more than 72 hours after administration.
In certain embodiments, the secreted protein is produced at levels above normal physiological levels. The level of secreted protein may be increased as compared to a control.
In some embodiments the control is the baseline physiological level of the polypeptide in a normal individual or in a population of normal individuals. In other embodiments the control is the baseline physiological level of the polypeptide in an individual having a deficiency in the relevant protein or polypeptide or in a population of individuals having a deficiency in the relevant protein or polypeptide. In some embodiments the control can be the normal level of the relevant protein or polypeptide in the individual to whom the composition is administered. In other embodiments the control is the expression level of the polypeptide upon other therapeutic intervention, e.g., upon direct injection of the corresponding polypeptide, at one or more comparable time points.
In certain embodiments the polypeptide is expressed by the target cell at a level which is at least 1.5-fold, at least 2-fold, at least 5-fold, at least 10-fold, at least 20-fold, 30-fold, at least 100-fold, at least 500 -fold, at least 5000-fold, at least 50,000-fold or at least 100,000-fold greater than a control. In some embodiments, the fold increase of expression greater than control is sustained for more than one, more than four, more than six, more than 12, more than 24, or more than 48 hours, or more than 72 hours after administration. For example, in one embodiment, the levels of secreted protein are detected in the serum at least 1.5-fold, at least 2-fold, at least. 5-fold, at least 10-fold, at least 20-fold, 30-fold, at least 100-fold, at least 500-fold, at least 5000-fold, at least 50,000-fold or at least 100,000-fold greater than a control for at least 48 hours or 2 days. In certain embodiments, the levels of secreted protein are detectable at 3 days, days, 5 days, or 1 week or more after administration. Increased levels of secreted protein may be Observed in the serum and/or in a tissue (e.g. liver, lung).
In some embodiments, the method yields a sustained circulation half-life of the desired secreted protein. For example, the secreted protein may be detected for hours or days longer than the half-life observed via subcutaneous injection of the secreted protein. In embodiments, the half-life of the secreted protein is sustained for more than 1 day, 2 days, 3 days, 4 days, 5 days, or 1 week or more.
In some embodiments administration comprises a single or repeated doses. In certain embodiments, the dose is administered intravenously, or by pulmonary delivery.
The polypeptide can be, for example, one or more of erythropoietin, α-galactosidase, LDL receptor, Factor VIII, Factor IX, α-L-iduronidase (for MPS 1), iduronate sulfatase (for MPS II), heparin-N-sulfatase (for MPS IIIA) α-N-acetylglucosaminidase (for MPS IIIB), galactose 6-sultatase (for MPS IVA), lysosomal acid lipase, arylsulfatase-A.
Certain embodiments relate to compositions and methods that provide to a cell or subject mRNA, at least a part of which encodes a functional protein, in art amount that is substantially less that the amount of corresponding functional protein generated from that mRNA. Put another way, in certain embodiments the mRNA delivered to the cell can produce an amount of protein that is substantially greater than the amount of mRNA delivered to the cell. For example, in a given amount of time, for example 1, 2, 3, 4, 5, 6, 7, 6, 9, 10, 12, 15, 20, or 24 hours from administration of the mRNA to a cell or subject, the amount of corresponding protein generated by that mRNA can be at least 1.5, 2, 3, 5, 10, 15, 20, 25, 50,100, 150, 200, 250, 300, 400, 500, or more times greater that the amount of mRNA actually administered to the cell or subject. This can be measured on a mass-by-mass basis, on a mole-by-mole basis, and/or on a molecule-by-molecule basis. The protein can be measured in various ways. For example, for a cell, the measured protein can be measured as intracellular protein, extracellular protein, or a combination of the two. For a subject, the measured protein can be protein measured in serum; in a specific tissue or tissues such as the liver, kidney, heart, or brain; in a specific cell type such as one of the various cell types of the liver or brain; or in any combination of serum, tissue, and/or cell type. Moreover, a baseline amount of endogenous protein can be measured in the cell or subject prior to administration of the mRNA and then subtracted from the protein measured after administration of the mRNA to yield the amount of corresponding protein generated from the mRNA. In this way, the mRNA can provide a reservoir or depot source of a large amount of therapeutic material to the cell or subject, for example, as compared to amount of mRNA delivered to the cell or subject. The depot source can act as a continuous source for polypeptide express on from the mRNA over sustained periods of time.
The above discussed and many other features and attendant advantages of the present invention will become better understood by reference to the following detailed description of the invention when taken in conjunction with the accompanying examples. The various embodiments described herein are complimentary and can be combined or used together in a manner understood by the skilled person in view of the teachings contained herein.
The invention provides compositions and methods for intracellular delivery of mRNA in a liposomal transfer vehicle to one or more target cells for production of therapeutic levels of secreted functional protein.
The term “functional,” as used herein to qualify a protein or enzyme, means that the protein or enzyme has biological activity, or alternatively is able to perform the same, or a similar function as the native or normally-functioning protein or enzyme. The mRNA compositions of the invention are useful for the treatment of a various metabolic or genetic disorders, and in particular those genetic or metabolic disorders which involve the non-expression, misexpression or deficiency of a protein or enzyme. The term “therapeutic levels” refers to levels of protein detected in the blood or tissues that are above control levels, wherein the control may be normal physiological levels, or the levels in the subject prior to administration of the mRNA composition. The term “secreted.” refers to protein that is detected outside the target cell, in extracellular space. The protein may be detected in the blood or in tissues. In the context of the present invention the term “produced” is used in its broadest sense to refer the translation of at least one mRNA into a protein or enzyme. As provided herein, the compositions include a transfer vehicle. As used herein, the term “transfer vehicle” includes any of the standard pharmaceutical carriers, diluents, excipients and the like which are generally intended for use in connection with the administration of biologically active agents, including nucleic, acids. The compositions and in particular the transfer vehicles described herein are capable of delivering mRNA to the target cell. In embodiments, the transfer vehicle is a lipid nanoparticle.
The mRNA in the compositions of the invention may encode, for example, a secreted hormone, enzyme, receptor, polypeptide, peptide or other protein of interest that is normally secreted. In one embodiment of the invention, the mRNA may optionally have chemical or biological modifications which, for example, improve the stability and for half-life of such mRNA or which improve or otherwise facilitate protein production.
The methods of the invention provide for optional co-delivery of one or more unique mRNA to target cells, for example, by combining two unique mRNAs into a single transfer vehicle. In one embodiment of the present invention, a therapeutic first mRNA, and as therapeutic second mRNA, may be formulated in a single transfer vehicle and administered. The present invention also contemplates co-delivery and/or co-administration of a therapeutic first mRNA and a second nucleic acid to facilitate and/or enhance the function or delivery of the therapeutic first mRNA. For example, such a second nucleic acid (e.g., exogenous or synthetic mRNA) may encode a membrane transporter protein that upon expression (e.g., translation of the exogenous or synthetic mRNA) facilitates the delivery or enhances the biological activity of the first mRNA. Alternatively, the therapeutic first mRNA may be administered with a second nucleic acid that functions as a “chaperone” for example, to direct the folding of either the therapeutic first mRNA.
The methods of the invention also provide for the delivery of one or more therapeutic nucleic acids to treat a single disorder or deficiency, wherein each such therapeutic nucleic acid functions by a different mechanism of action. For example, the compositions of the present invention may comprise a therapeutic first mRNA which, for example, is administered to correct an endogenous protein or enzyme deficiency, and which is accompanied by a second nucleic acid, which is administered to deactivate or “knock-down” a malfunctioning endogenous nucleic acid and its protein or enzyme product. Such “second” nucleic acids may encode, for example mRNA or siRNA.
Upon transfection, a natural mRNA in the compositions of the invention may decay with a half-life of between 30 minutes and several days. The mRNA in the compositions of the invention preferably retain at least some ability to be translated, thereby producing a functional secreted protein or enzyme. Accordingly, the invention provides compositions comprising and methods of administering a stabilized mRNA. In some embodiments of the invention, the activity of the mRNA is prolonged over an extended period of time. For example, the activity of the mRNA may be prolonged such that the compositions of the present invention are administered to a subject on a semi-weekly or bi-weekly basis, or more preferably on a monthly, bi-monthly, quarterly or an annual basis. The extended or prolonged activity of the mRNA of the present invention, is directly related to the quantity of secreted functional protein or enzyme produced from such mRNA. Similarly, the activity of the compositions of the present invention may be further extended or prolonged by modifications made to improve or enhance translation of the mRNA. Furthermore, the quantity of functional protein or enzyme produced by the target cell is a function of the quantity of mRNA delivered to the tar et cells and the stability of such mRNA. To the extent that the stability of the mRNA of the present invention may be improved or enhanced, the half-life, the activity of the produced secreted protein or enzyme and the dosing frequency of the composition may be further extended.
Accordingly, in some embodiments, the mRNA in the compositions of the invention comprise at least one modification which confers increased or enhanced stability to the nucleic acid, including, for example, improved resistance to nuclease digestion in vivo. As used herein, the terms “modification” and “modified” as such terms relate to the nucleic acids provided herein, include at least one alteration which preferably enhances stability and renders the mRNA more stable (e.g., resistant to nuclease digestion) than the wild-type or naturally occurring version of the mRNA. As used herein, the terms “stable” and “stability” as such terms relate to the nucleic acids of the present invention, and particularly with respect to the mRNA, refer to increased or enhanced resistance to degradation by, for example nucleases (i.e., endonucleases or exonucleases) which are normally capable of degrading such mRNA. Increased stability can include, for example, less sensitivity to hydrolysis or other destruction by endogenous enzymes (e.g., endonucleases or exonucleases) or conditions within the target cell or tissue, thereby increasing or enhancing the residence of such mRNA in the target cell, tissue, subject and or cytoplasm. The stabilized mRNA molecules provided herein demonstrate longer half-lives relative to their naturally occurring, unmodified counterparts (e.g., the wild-type version of the mRNA). Also contemplated by the terms “modification” and “modified” as such terms related to the mRNA of the present invention are alterations which improve or enhance translation of mRNA nucleic acids, including for example, the inclusion of sequences winch function in the initiation of protein translation (e.g., the Kozac consensus sequence). (Kozak, M., Nucleic Acids Res 15 (20); 8125-48(1987)).
In some embodiments the mRNA of the invention have undergone a chemical or biological modification to render them more stable. Exemplary modifications to an mRNA include the depletion of a base (e.g., by deletion or by the substitution of one nucleotide for another) or modification of a base, for example, the chemical modification of a base. The phrase “chemical modifications” as used herein, includes modifications which introduce chemistries which differ from those seen in naturally occurring mRNA, for example, covalent modifications such as the introduction of modified nucleotides, (e.g., nucleotide analogs, or the inclusion of pendant groups which are not naturally found in such mRNA molecules).
In addition, suitable modifications include alterations in one or more nucleotides of a codon such that the codon encodes the same amino acid but is more stable than the codon found in the wild-type version of the mRNA. For example, an inverse relationship between the stability of RNA and a higher number cytidines (C's) and/or uridines (U's) residues has been demonstrated, and RNA devoid of C and U residues have been found to be stable to most RNases (Heidenreich, et al. J Biol Chem 269, 2131-8 (1994)). In some embodiments, the number of C and/or U residues in an mRNA sequence is reduced. In a another embodiment, the number of C and/or U residues is reduced by substitution of one codon encoding a particular amino acid for another codon encoding the same or a related amino acid. Contemplated modifications to the mRNA nucleic acids of the present invention also include the incorporation of pseudouridines. The incorporation of pseudouridines into the mRNA nucleic acids of the present invention may enhance stability and translational capacity, as well as diminishing immunogenicity in vivo. See, e.g., Karikó, K., et al., Molecular Therapy 16(11): 1833-1840 (2008). Substitutions and modifications to the mRNA of the present invention may be performed by methods readily known to one or ordinary skill in the art.
The constraints on reducing the number of C and U residues in a sequence will likely be greater within the coding region of an mRNA, compared to an untranslated region, (i.e., it will likely not be possible to eliminate all of the C and U residues present in the message while still retaining the ability of the message to encode the desired amino acid sequence). The degeneracy of the genetic code, however presents an opportunity to allow the number of C and/or U residues that are present in the sequence to be reduced, while maintaining the same coding capacity (i.e., depending on which amino acid is encoded by as codon, several different possibilities for modification of RNA sequences may be possible). For example, the codons for Gly can be altered to GGA or GGG instead of GGU or GGC.
The term modification also includes, for example, the incorporation of non-nucleotide linkages or modified nucleotides into the mRNA sequences of the present invention (e.g., modifications to one or both the 3′ and 5′ ends of an mRNA molecule encoding a functional secreted protein or enzyme). Such modifications include the addition of bases to an mRNA sequence (e.g., the inclusion of a poly A tail or a longer poly A tail), the alteration of the 3′ UTR or the 5′ UTR, complexing the mRNA with an agent (e.g., a protein or a complementary nucleic acid molecule), and inclusion of elements which change the structure of an mRNA molecule (e.g., which form secondary structures).
The poly A tail is thought to stabilize natural messengers. Therefore, in one embodiment a long poly A tail can be added to an mRNA molecule thus rendering the mRNA more stable. Poly A tails can be added using a variety of art-recognized techniques. For example, long poly A tails can be added to synthetic or in vitro transcribed mRNA using poly A polymerase (Yokoe, et. al. Nature Biotechnology, 1996; 14. 1252-1256). A transcription vector can also encode long poly A tails. In addition, poly A tails can be added by transcription directly from PCR products. In one embodiment, the length of the poly A tail is at least about 90, 200, 300, 400 at least 500 nucleotides. In one embodiment, the length of the poly A tail is adjusted to control the stability of a modified mRNA molecule of the invention and, thus, the transcription of protein. For example, since the length of the poly A tail can influence the half-life of an mRNA molecule, the length of the poly A tail can be adjusted to modify the level of resistance of the mRNA to nucleases and thereby control the time course of protein expression in a cell. In one embodiment, the stabilized mRNA molecules are sufficiently resistant to in vivo degradation (e.g., by nucleases), such that they may be delivered to the target cell without a transfer vehicle.
In one embodiment, an mRNA can be modified by the incorporation 3′ and/or 5′ untranslated (UTR) sequences which are not naturally found in the wild-type mRNA. In one embodiment, 3′ and/or 5′ flanking sequence which naturally flanks an mRNA and encodes a second, unrelated protein can be incorporated into the nucleotide sequence of an mRNA molecule encoding a therapeutic or functional protein in order to modify it. For example, 3′ or 5′ sequences from mRNA molecules which are stable (e.g., globin, actin, GAPDH, tubulin, histone, or citric acid cycle enzymes) can be incorporated into the 3′ and/or 5′ region of a sense mRNA nucleic acid molecule to increase the stability of the sense mRNA molecule. See, e.g., US2003/0083272.
In some embodiments, the mRNA in the compositions of the invention include modification of 5′ end of the mRNA to include a partial sequence of a CMV immediate-early 1 (1E1) acne or a filament thereof (e.g., SEQ ID NO:1) to improve the nuclease resistance and/or improve the half-life of the mRNA. In addition to increasing the stability of the mRNA nucleic acid sequence, it has been surprisingly discovered the inclusion of a partial sequence of a CMV immediate-early 1 (1E1) gene enhances the translation of the mRNA and the expression of the functional protein or enzyme. Also contemplated is the inclusion of a human growth hormone (hGH) gene sequence, or a fragment thereof (e.g., SEQ ID NO:2) to the 3′ ends of the nucleic acid mRNA) to further stabilize the mRNA. Generally, preferred modifications improve the Stability and/or pharmacokinetic properties (e.g., half-life) of the mRNA relative, to their unmodified counterparts, and include, for example modifications made to improve such mRNA's resistance to in vivo nuclease digestion.
Further contemplated are variants of the nucleic acid sequence of SEQ ID NO:1 and/or SEQ ID NO:2, wherein the the variants maintain the functional properties of the nucleic acids including stabilization of the mRNA and/or pharmacokinetic properties (e.g., half-life). Variants may have greater than 90%, greater than 95%, greater than 98%, or greater than 99% sequence identity to SEQ ID NO:1 or SEQ ID NO:2.
In some embodiments, the composition can comprise a stabilizing reagent. The compositions can include one or more formulation reagents that bind directly or indirectly to, and stabilize the mRNA, thereby enhancing residence time in the target cell. Such reagents preferably lead to an improved half-life of the mRNA in the target cells. For example, the stability of an mRNA and efficiency of translation may be increased by the incorporation of “stabilizing reagents” that form complexes with the mRNA that naturally occur within a cell (see e.g., U.S. Pat. No. 5,677,124). Incorporation of a stabilizing reagent can be accomplished for example by combining the poly and a protein with the mRNA to be stabilized in vitro before loading or encapsulating the mRNA within a transfer vehicle. Exemplary stabilizing reagents include one or more proteins, peptides, aptamers, translational accessory protein, mRNA binding proteins, and/or translation initiation factors.
Stabilization of the compositions may also be improved by the use of opsonization-inhibiting moieties, which are typically large hydrophilic polymers that are chemically or physically bound to the transfer vehicle (e.g., by the intercalation of a lipid-soluble anchor into the membrane itself, or by binding directly to active groups of membrane lipids). These opsonization-inhibiting hydrophilic polymers form a protective surface layer which significantly decreases the uptake of the liposomes by the macrophage-monocyte system and reticulo-endothelial system (e.g., as described in U.S. Pat. No. 4,920,016 , the entire disclosure of which is herein incorporated by reference). Transfer vehicles modified with opsonization-inhibition moieties thus remain in the circulation much longer than their unmodified counterparts.
When RNA is hybridized to a complementary nucleic acid molecule (e.g., DNA or RNA) it may be protected from nucleases. (Krieg, et al. Melton, Methods in Enzymology, 1987; 155, 397-4151). The stability of hybridized mRNA is likely due to the inherent single strand specificity of most RNases. In some embodiments, the stabilizing reagent selected to complex a mRNA is a eukaryotic protein, (e.g., a mammalian protein). In yet another embodiment, the mRNA can be modified by hybridization to a second nucleic acid molecule. If an entire to mRNA molecule were hybridized to a complementary nucleic acid molecule translation initiation may be reduced. In some embodiments the 5′ untranslated region and the AUG start region of the mRNA molecule may optionally be left unhybridized. Following translation initiation, the unwinding activity of the ribosome complex can function even on high affinity duplexes so that translation can proceed. (Liebhaber. J. Mol. Biol. 1992: 226: 2-13; Monia, et al. J Biol Chem. 1993 268: 14514-22.)
It will be understood that any of the above described methods for enhancing the stability of mRNA may be used either alone or in combination with one or more of any of the other above-described methods and/or compositions.
The mRNA of the present invention may be optionally combined with a reporter gene (e.g., upstream or downstream of the coding region of the mRNA) which, for example, facilitates the determination of mRNA delivery to the target cells or tissues. Suitable reporter genes may include, for example, Green Fluorescent Protein mRNA ((HP mRNA), Renilla Luciferase mRNA (Luciferase mRNA), Firefly Luciferase mRNA, or any combinations thereof. For example, GFP mRNA may be fused with a mRNA encoding a secretable protein to facilitate confirmation of mRNA localization in the target cells that will act as a depot for protein production.
As used herein, the terms “transfect” or “transfection” mean the intracellular introduction of a mRNA into a cell, or preferably into a target cell. The introduced mRNA may be stably or transiently maintained in the target cell. The term “transfection efficiency” refers to the relative amount of mRNA taken up by the target cell which is subject to transfection. In practice, transfection efficiency is estimated by the amount of a reporter nucleic acid product expressed by the target cells following transfection. Preferred embodiments include compositions with high transfection efficacies and in particular those compositions that minimize adverse effects which are mediated by transfection of non-target cells. The compositions of the present invention that demonstrate high transfection efficacies improve the likelihood that appropriate dosages of the mRNA will be delivered to the target cell, while minimizing potential systemic adverse effects. In one embodiment of the present invention, the transfer vehicles of the present invention are capable of delivering large mRNA sequences (e.g., mRNA of at least 1 kDa, 1.5 kDa, 2 kDa, 2.5 kDa, 5 kDa, 10 kDa, 12 kDa, 15 kDa, 20 kDa, 25 kDa, 30 kDa, or more). The mRNA can be formulated with one or more acceptable reagents, which provide a vehicle for delivering such mRNA to target cells. Appropriate reagents are generally selected with regard to a number of factors, which include, among other things, the biological or chemical properties of the mRNA, the intended route of administration, the anticipated biological environment to which such mRNA will be exposed and the specific properties of the intended target cells. In some embodiments, transfer vehicles, such as liposomes, encapsulate the mRNA without compromising biological activity. In some embodiments, the transfer vehicle demonstrates preferential and/or substantial binding to a target cell relative to non-target cells. In a preferred embodiment, the transfer vehicle delivers its contents to the target cell such that the mRNA are delivered to the appropriate subcellular compartment, such as the cytoplasm.
In embodiments, the transfer vehicle in the compositions of the invention is a liposomal transfer vehicle, e.g. a lipid nanoparticle. In one embodiment, the transfer vehicle may be selected and/or prepared to optimize delivery of the mRNA to a target cell. For example, if the target cell is a hepatocyte the properties of the transfer vehicle (e.g., size, charge and/or pH) may be optimized to effectively deliver such transfer vehicle to the target cell, reduce immune clearance and/or promote retention in that target cell. Alternatively, if the target cell is the central nervous system (e.g., mRNA administered for the treatment of neurodegenerative diseases may specifically target brain or spinal tissue), selection and preparation of the transfer vehicle must consider penetration of, and retention within the blood brain barrier and/or the use of alternate means of directly delivering such transfer vehicle to such target cell. In one embodiment the compositions of the present invention may be combined with agents that facilitate the transfer of exogenous mRNA (e.g., agents winch disrupt or improve the permeability of the blood brain barrier and thereby enhance the transfer of exogenous mRNA to the target cells).
The use of liposomal transfer vehicles to facilitate the delivery of nucleic acids to target cells is contemplated by the present invention. Liposomes (e.g., liposomal lipid nanoparticles) are generally useful in a variety of applications in research, industry, and medicine, particularly for their use as transfer vehicles of diagnostic or therapeutic compounds in vivo (Lasic, Trends Biotechnol., 16: 307-321, 1998; Drummond et al., Pharmacol. Rev., 51: 691-743, 1999) and are usually characterized as microscopic vesicles having an interior aqua space sequestered from an outer medium by a membrane of one or more bilayers. Bilayer membranes of liposomes are typically formed by amphiphilic molecules, such as lipids of synthetic or natural origin that comprise spatially separated hydrophilic and hydrophobic domains (Lasic, Trends Biotechnol., 16: 307-321, 1998). Bilayer membranes of the liposomes can also be formed by amphiphilic polymers and surfactants (e.g., polymersomes, niosmes, etc.).
In the context of the present invention, a liposomal transfer vehicle typically serves to transport the mRNA to the target cell. For the purposes of the present invention, the liposomal transfer vehicles are prepared to contain the desired nucleic acids. The process of incorporation of a desired entity (e.g., a nucleic acid) into a liposome is often referred to as “loading” (Lasic, et al., FEBS Lett., 312: 255-258, 1992). The liposome-incorporated nucleic acids may be completely or partially located in the interior space of the liposome, within the bilayer membrane of the liposome, or associated with the exterior surface of the liposome membrane. The incorporation of a nucleic acid into liposomes is also referred to herein as “encapsulation” wherein the nucleic acid is entirely contained within the interior space of the liposome. The purpose of incorporating a mRNA into a transfer vehicle, such as a liposome, is often to protect the nucleic acid from an environment which may contain enzymes or chemicals that degrade nucleic acids and/or systems or receptors that cause the rapid excretion of the nucleic acids. Accordingly, in a preferred embodiment of the present invention, the selected transfer vehicle is capable of enhancing the stability of the mRNA contained therein. The liposome can allow the encapsulated mRNA to reach the target cell and/or may preferentially allow the encapsulated mRNA to teach the target cell, or alternatively limit the delivery of such mRNA to other sites or cells where the presence of the administered mRNA may be useless or undesirable. Furthermore, incorporating the mRNA into a transfer vehicle, such as for example, a cationic liposome, also facilitates the delivery of such mRNA into a target cell.
Ideally, liposomal transfer vehicles are prepared to encapsulate one or more desired mRNA such that the compositions demonstrate a high transfection efficiency and enhanced stability. While liposomes can facilitate introduction of nucleic acids into target cells, the addition of polycations (e.g., poly L-lysine and protamine), as a copolymer can facilitate, and in some instances markedly enhance the transfection efficiency of several types of cationic liposomes by 2-28fold in a number of cell lines both in vitro and in vivo. (See N. J. Caplen, et al., Gene Ther. 1995 2: 603; S. Li, et al., Gene Ther. 1997; 4, 891.)
In a preferred embodiment of the present invention, the transfer vehicle is formulated as a lipid nanoparticle. As used herein, the phrase “lipid nanoparticle” refers to a transfer vehicle comprising one or more lipids (e.g., cationic lipids, non-cationic lipids, and PEG-modified lipids). Preferably, the lipid nanoparticles are formulated to deliver one or more mRNA to one or more target cells. Examples of suitable lipids include, for example, the phosphatidyl compounds (e.g., phosphatidylglycerol, phosphatidylcholine, phosphatidylserine, phosphatidylethanolamine, sphingolipids, cerebrosides, and gangliosides). Also contemplated is the use of polymers as transfer vehicles, whether alone or in combination with other transfer vehicles. Suitable polymers may include, for example, polyacrylates, polyalkycyanoacrylates, polylactide, polylactide-polyglycolide copolymers, polycaprolactones, dextran, albumin; gelatin, alginate, collagen, chitosan, cyclodextrins, dendrimers and polythylemimine. In one embodiment, the transfer vehicle is selected based upon its ability to facilitate the transfection of a mRNA to a target cell.
The invention contemplates the use of lipid nanoparticles as transfer vechicles comprising a cationic lipid to encapsulate and/or enhance the delivery of mRNA into the target cell that will act as a depot for protein production. As used herein, the phrase “cationic lipid” refers to any of a number of lipid species that carry a net positive charge at a selected pH, such as physiological pH. The contemplated lipid nanoparticles may be prepared by including multi-component lipid mixtures of varying ratios employing one or more cationic lipids, non-cationic lipids and PEG-modified lipids. Several cationic lipids have been described in the literature, many of which are commercially available.
Particularly suitable cationic lipids for use in the compositions and methods of the invention include those described in international patent publication WO 2010/053572, incorporated herein by reference, and most particularly, C12-200 described at paragraph 00225 of WO 2010/053572. In certain embodiments, the compositions and methods of the invention employ a lipid nanoparticles comprising an ionizable cationic lipid described in U.S. provisional patent application 61/617,468, filed Mar. 29, 2012 (incorporated herein by reference), such as, e.g., (15Z,18Z)-N,N-dimethyl-6(9Z,12Z)-octadeca-9,12-dien-1-yl)telracosa-15,18-dien-1amine (HGT5000), (15Z,18Z)-N,N-dimethyl-6-((9Z,12Z)-octadeca-9,12-dien-1-yl)tetracosa-4,15,18-trien-1-amine (HGT5001), and (15Z,18Z)-N,N-dimethyl-6-((9Z,12Z)-octadea-9,12-dien-1-yl)tetracosa-5,15,18-trien-1-amine(HGT5002).
In some embodiments, the cationic lipid N-[1-(2,3-dioleyloxy)propyl]-N,N,N-trimethylammanium chloride or “DOTMA” is used. (Felgner et. al (Proc. Nat'l Acad. Sci. 84, 7413 (1987); U.S. Pat. No. 4,897,355). DOTMA can be formulated alone or can be combined with the neutral lipid, dioleoylphosphatidyl-ethanolamine or “DOPE” or other cationic or non-cation lipids into a liposomal transfer vehicle or a lipid nanoparticle, and such liposomes can be used to enhance the delivery of nucleic acids into target cells. Other suitable cationic lipids include, for example, 5-carboxyspermylglycinedioctadecylamide or “DOGS,” 2,3-dioleyloxy-N-[2(spermine-carboxamido)ethy]-N,N -dimethyl-1-propanaminium or “DOSPA” (Behr et al. Proc. Nat.'L Acad. Sci, 86; 6982 (1989); U.S. Pat. Nos. 5,171,678; 5,334,761), 1,2-Dioleoyl-3-Dimethylammonium-Propane or “DODAP”, 1,2-Dioleoyl-3-Trimethylammonium-Propane or “DOTAP”, Contemplated cationic lipids also include 1,2-distearyloxy-N,N-dimethyl-3-aminopropane or “DSDMA”, 1,2-dioleyloxy-N,N-dimethyl-3-aminopropane or “DODMA”, 1,2-dilinoleyloxy-N,N-dimethyl-3-aminopropane or “DLinDMA”, 1,2-dilinolenyloxy-N,N-dimethyl-3-aminopropane or “DLenDMA”, N-dioleyl-N,N-dimethylammonium chloride or “DODAC”, N,N-distearyl-N,N-dimethylammonium bromide or “DDAB”, N-(1,2-dimyristyloxyprop-3-yl)-N,N-dimethyl-N-hydroxyethyl ammonium bromide or “DMRIE”, 3-dimethylamino-2-(cholest-5-en-3-beta-oxybutan-4-oxy)-1-(cis,cis-9,12-octadecadienoxy)propane or “CLinDMA”, 2-[5′-(cholest-5-en-3-beta-oxy)-3′-oxapentoxy)-3-dimethy 1-1-(cis,cis-9′,1-2′-octadecadienoxy)propane or “CpLinDMA”, N,N-dimethyl-3,4-diolcyloxybenzylamine or “DMOBA”, 1,2-N,N′-dioleylcarbamyl-3-dimethylaminopropane or “DOcarbDAP”, 2,3-Dilinoleoyloxy -N,N-dimethylpropylamine or “DLinDAP”, 1,2-N,N′-Dilinoleylcarbamyl-3-dimethylaminopropane or “DLincarbDAP”, 1,2-Dilinoleoylcarbamyl-3-dimethylaminopropane or “DLinCDAP”, 2,2-dilinoleyl-4-dimethylaminomethyl-[1,3]-dioxolane or “DLin-K-DMA”, 2,2-dilinoleyl-4-dimethylaminoethyl-[1,3]-dioxolane or “DLin-K-XTC2-DMA”, and 2-(2,2-di(9Z,12Z,)-octadeca-9,12-dien-1-yl)-1,3-dioxolan-4-yl)-N,N-dimethylethanamine (DLin-KC2-DMA)) (See, WO 2010/042877; Semple et al., Nature Biotech. 28:172-176(2010)), or mixtures thereof. (Heyes J., et al., Controlled Release 1.07: 276-287 (2005); Morrissey, D V. et al., Nat. Biotechnol. 23(8): 1003-1007(2005); PCT Publication WO2005/121348A1).
The use of cholesterol-based cationic lipids is also contemplated by the present invention. Such cholesterol-based cationic lipids can be used, either alone or in combination with other cationic or non-cationic lipids. Suitable cholesterol-based cationic lipids include, for example, DC-Chol (N,N-dimethyl-N-ethylcarboxamidocholesterol), 1,4-bis(3-N-oleylamino-propyl)piperazine (Gao, et al. Biochem. Biophys. Res. Comm. 179, 280(1991); Wolf et al. BioTechniques 23, 139 (1997); U.S. Pat. No. 5,744,33), or ICE.
In addition, several reagents are commercially available to enhance transfection efficacy. Suitable examples include LIPOFECTIN (DOTMA:DOPE) (Invitrogen, Carlsbad, Calif.), LIPOFECTAMINE (DOSPA:DOPE) (Invitrogen), LIPOFECTAMINE2000. (Iuvitrogen), FUGENE, TRANSFECTAM (DOGS), and EFFECTENE.
Also contemplated are cationic lipids such as the dialkylamino-based, imidazole-based, and guanidinium-based lips. For example, certain embodiments are directed to a composition comprising one or more imidazole-based cationic lipids, for example, the imidazole cholesterol ester or “ICE” lipid (3S, 10R, 13R, 17R)-10,13-dimethyl-17-((R)-6-methylheptan-2-yl)-2,3,4,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopental[a]phenanthren-3-yl 3-(1H-imidazol-4-yl)propanoate, as represented by structure (I) below. In a preferred embodiment, a transfer vehicle for delivery of mRNA may comprise one or more imidazole-based cationic lipids, for example, the imidazole cholesterol ester or “ICE” lipid (3S, 10R, 13R, 17R)-10,13-dimethyl-17-((R)-6-methylheptan-2-yl)-2,3,4,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-3-yl 3-(1H-imidazol-4-yl)propanoate, as represented by structure (I).
Without wishing to be bound by a particular theory, it is believed that the fusogenicity of the imidazole-based cationic lipid ICE is related to the endosomal disruption which is facilitated by the imidazole group, which has a lower pKa relative to traditional cationic lipids. The endosomal disruption in turn promotes osmotic swelling and the disruption of the liposomal membrane, followed by the transfection or intracellular release of the nucleic acid(s) contents loaded therein into the target cell.
The imidazole-based cationic lipids are also characterized by their reduced toxicity relative to other cationic lipids. The imidazole-based cationic lipids (e.g., ICE) may be used as the sole cationic lipid in the lipid nanoparticle, or alternatively may be combined with traditional cationic lipids, non-cationic lipids, and PEG-modified lipids. The cationic lipid may comprise a molar ratio of about: 1% to about 90%, about 2% to about 70%, about 5% to about 50%, about 10% to about 40% of the total lipid present in the transfer vehicle, or preferably about 20% to about 70% of the total lipid present in the transfer vehicle.
Similarly, certain embodiments are directed to lipid nanoparticles comprising the HGT4003 cationic lipid-2-(2,3-Bis((9Z,12Z)-octadeca-9,12-dien-1-yloxy)propyl)disulfanyl)-N,N-dimethylethanamine, as represented by structure (II) below, and as further described in U.S. Provisional Application No.: 61/494,745, filed Jun. 8, 2011, the entire teachings of which are incorporated herein by reference in their entirety:
In other embodiments the compositions and methods described herein are directed to lipid nanoparticles comprising one or more cleavable lipids, such as, for example, one or more cationic lipids or compounds that comprise a cleavable disulfide(S—S) functional group (e.g.; HGT4001, HGT4002, HGT4003, HGT4004 and HGT4005), as further described in U.S. Provisional Application No.: 61/494,745, the entire teachings of which are incorporated herein by reference in their entirety.
The use of polyethylene glycol (PEG)-modified phospholipids and derivatized lipids such as derivatized cerarmides (PEG-CER), including N-Octanoyl-Sphingosine-1-[Succinyl(Methoxy Polyethylene Glycol)-2000] (C8PEG-2000 ceramide) is also contemplated by the present invention, either alone or preferably in combination with other lipids together which comprise the transfer vehicle (e.g., a lipid nanoparticle). Contemplated PEG-modified lipids include, but is not limited to, a polyethylene glycol chain of up to 5 kDa in length covalently attached to a lipid with alkyl chain(s) of C6-C20 length. The addition of such components may prevent complex aggregation and may also provide a means for increasing circulation lifetime and increasing the delivery of the lipid-nucleic acid composition to the target cell, (Klibanov et al. (1990) FEBS Letters, 268(1): 235-237), or they may be selected to rapidly exchange out of the formulation in vivo (see U.S. Pat. No. 5,885,613). Particularly useful exchangeable lipids are PEG-ceramides having shorter acyl chains (e.g., C14or C18). The PEG-modified phospholipid and derivatized lipids of the present invention may comprise a molar ratio from about 0% to about 20%, about 0.5% to about 20%, about 1% to about 15%, about 4% to about 10%, or about 2% of the total lipid resent in the liposomal transfer vehicle.
The present invention also contemplates the use of non-canonic lipids. As used herein, the phrase “non-cationic lipid” refers to any neutral, zwitterionic or anionic lipid. As used herein, the phrase “anionic lipid” refers to any of a number of lipid species that carry a net negative charge at a selected pH, such as physiological pH. Non-cationic lipids include, but are not limited to, distearoylphosphatidylcholine (DSPC), dioleoylphosphatidylcholine (DOPC), dipalmitoylphosphatidylcholine (DPPC), dioleoylphosphatidylglycerol (DOPG), dipalmitoylphosphatidylglycerol (DPPG), dioleoylphosphatidylethanolamine (DOPE), palmitoyloleoylphosphatidylcholine (POPC), palmitoyloleoyl-phosphatidylethanolamine (POPE), dioleoyl-phosphatidylethanolamine 4-(N-maleimidomethyl)-cyclohexane-1-carboxylate (DOPE-mal), dipalmitoyl phosphatidyl ethanolamine (DPPE), dimyristoylphosphoethanolamine (DMPE), distearoyl-phosphatidyl-ethanolamine (DSPE), 16-O-monomethyl PE, 16-O-dimethyl PE, 18-1-trans PE, 1-stearoyl-2-oleoyl-phosphatidyethanolamine (SOPE), cholesterol, or a mixture thereof. Such non-cationic lipids may be used alone, but are preferably used in combination with other excipients, for example, cationic lipids. When used in combination with a cationic lipid, the non-cationic lipid may comprise a molar ratio of 5% to about 90%, or preferably about 10% to about 70% of the total lipid present in the transfer vehicle.
Preferably, the transfer vehicle (e.g., a lipid nanoparticle) is prepared by combining multiple lipid and/or polymer components. For example, a transfer vehicle may be prepared using C12-200, DOPE, chol, DMG-PEG2K at a molar ratio of 40:30:25:5, or DODAP, DOPE, cholesterol, DMG-PEG2K at a molar ratio of 18:56:20:6, or HGT5000, DOPE, chol, DMG-PEG2K at a molar ratio of 40:20:35:5, or HCT5001, DOPE, chol, DMG-PEG2K at a molar ratio of 40:20:35:5. The selection of cationic lipids, non-cationic lipids and/or PEG-modified lipids which comprise the lipid nanoparticle, as well as the relative molar ratio of such lipids to each other, is based upon the characteristics of the selected lipid(s), the nature of the intended target cells, the characteristics of the mRNA to be delivered. Additional considerations include, for example, the saturation of the alkyl chain, as well as the size, charge, pH, pKa, fusogenicity and toxicity of the selected lipid(s). Thus the molar ratios may be adjusted accordingly. For example, in embodiments, the percentage of cationic lipid in the lipid nanoparticle may be greater than 10%, greater than 20%, greater than 30%, greater than 40%, greater than 50%, greater than 60%, or greater than 70%. The percentage of non-cationic lipid in the lipid nanoparticle may be greater than 5%, greater than 10%, greater than 20%, greater than 30%, or greater than 40%. The percentage of cholesterol in the lipid nanoparticle may be greater than 10%, greater than 20%, greater than 30%, or greater than 40%. The percentage of PEG-modified lipid in the lipid nanoparticle may be greater than 1%, greater than 2%, greater than 5%, greater than 10%, or greater than 20%.
In certain preferred embodiments, the lipid nanoparticles of the invention comprise at least one of the following cationic lipids: C12-200, DLin-KC2-DMA, DODAP, HGT4003, ICE, HGT5000, or HGT5001. In embodiments, the transfer vehicle comprises cholesterol and/or a PEG-modified lipid. In some embodiments, the transfer vehicles comprises DMG-PEG2K. In certain embodiments, the transfer vehicle comprises one of the following lipid formulations: C12-200, DOPE, chol, DMG-PEG2K DODAP, DOPE, cholesterol, DMG-PEG2K; HGT5000, DOPE, chol, DMG-PEG2K, HGT5001, DOPE, chol, DMG-PEG2K.
The liposomal transfer vehicles for use in the compositions of the invention can be prepared by various techniques which are presently known in the art. Multi-lamellar vesicles (MLV) may be prepared conventional techniques, for example, by depositing a selected lipid on the inside wall of a suitable container or vessel by dissolving the lipid in an appropriate solvent, and then evaporating the solvent to leave a thin film on the inside of the vessel or by spray drying. An aqueous phase may then added to the vessel with a vortexing motion which results in the formation of MLVs. Uni-lamellar vesicles (ULV) can then be formed by homogenization, sonication or extrusion of the multi-lamellar vesicles. In addition, unilamellar vesicles can be formed by detergent removal techniques.
In certain embodiments of this invention, the compositions of the present invention comprise a transfer vehicle wherein the mRNA is associated on both the surface of the transfer vehicle and encapsulated within the same transfer vehicle. For example, during preparation of the compositions of the present invention, cationic liposomal transfer vehicles may associate with the mRNA through electrostatic interactions.
In certain embodiments, the compositions of the invention may be loaded with diagnostic radionuclide, fluorescent materials or other materials that are detectable in both in vitro and in vivo applications. For example, suitable diagnostic materials for use in the present invention may include Rhodarnine-dioleoylphospha-tidylethanolamine (Rh-PE), Green Fluorescent Protein mRNA (GFP mRNA), Renilla Luciferase mRNA and Firefly Luciferase mRNA.
Selection of the appropriate size of a liposomal transfer vehicle must take into consideration the site of the target cell or tissue and to some extent the application for which the liposome is being made. In some embodiments, it may be desirable to limit transfection of the mRNA to certain cells or tissues. For example, to target hepatocytes a liposomal transfer vehicle may be sized such that its dimensions are smaller than the fenestrations of the endothelial layer lining hepatic sinusoids in the liver; accordingly the liposomal transfer vehicle can readily penetrate such endothelial fenestrations to reach the target hepatocytes. Alternatively, a liposomal transfer vehicle may be sized such that the dimensions of the liposome are of a sufficient diameter to limit or expressly avoid distribution into certain cells or tissues. For example, a liposomal transfer vehicle may be sized such that its dimensions are larger than the fenestrations of the endothelial layer lining hepatic sinusoids to thereby limit distribution of the liposomal transfer vehicle to hepatocytes. Generally, the size of the transfer vehicle is within the range of about 25 to 250 nm, prefereably less than about 250 nm, 175 nm, 150 nm, 125 nm, 100 nm, 75 nm, 50 nm, 25 nm or 10 nm.
A variety of alternative methods known in the art are available for sizing of a population of liposomal transfer vehicles. One such sizing method is described in U.S. Pat. No. 4,737,323, incorporated herein by reference. Sonicating a liposome suspension either by bath or probe sonication produces a progressive size reduction down to small ULV less than about 0.05 microns in diameter. Homogenization is another method that relies on shearing energy to fragment large liposomes into smaller ones. In a typical homogenization procedure, MLV are recirculated through a standard emulsion homogenizer unfit selected liposome sizes, typically between about 0.1 and 0.5 microns, are observed. The size of the liposomal vesicles may be determined by quasi-electric light scattering (QELS) as described in Bloomfield, Ann. Rev. Biophys. Bioeng., 10:421-450(1981), incorporated herein by reference. Average liposome diameter may be reduced by sonication of formed liposomes. Intermittent sonication cycles may be alternated with QELS assessment to guide efficient liposome synthesis.
As used herein, the term “target cell” refers to a cell or tissue to which a composition of the invention is to be directed or targeted. In some embodiments, the target cells are deficient in a protein or enzyme of interest. For example, where it is desired to deliver a nucleic acid to a hepatocyte, the hepatocyte represents the target cell. In some embodiments, the compositions of the invention transfect the target cells on a discriminatory basis (i.e., do not transfect non-target cells). The compositions of the invention may also be prepared to preferentially target a variety of target cells, which include, but are not limited to, hepatocytes, epithelial cells, hematopoietic cells, epithelial cells, endothelial cells, lung cells, bone cells, stem cells, mesenchymal cells, neural cells (e.g., meninges, astrocytes, motor neurons, cells of the dorsal root ganglia and anterior horn motor neurons), photoreceptor cells (e.g., rods and cones), retinal pigmented epithelial cells, secretory cells, cardiac cells, adipocytes, vascular smooth muscle cells, cardiomyocytes, skeletal muscle cells, beta cells, pituitary cells, synovial lining cells, ovarian cells, testicular cells, fibroblasts, B cells, T cells, reticulocytes, leukocytes, granulocytes and tumor cells.
The compositions of the invention may be prepared to preferentially distribute to target cells such as in the heart, lungs, kidneys, liver, and spleen. In some embodiments, the compositions of the invention distribute into the cells of the liver to facilitate the delivery and the subsequent expression of the mRNA comprised therein by the cells of the liver (e.g., hepatocytes). The targeted hepatocytes my function as a biological “reservoir” or “depot” capable of producing, and systemically excreting a functional protein or enzyme. Accordingly, in one embodiment of the invention the liposomal transfer vehicle may target hepatocyes and/or preferentially distribute to the cells of the liver upon delivery. Following transfection of the target hepatocytes, the mRNA loaded in the liposomal vehicle are translated and a functional protein product is produced, excreted and systemically distributed. In other embodiments, cells other than hepatocytes (e.g., lung, spleen, heart, ocular, or cells of the central nervous system) can serve as a depot location for protein production.
In one embodiment, the compositions of the invention facilitate a subject's endogenous production of one or more functional proteins and/or enzymes, and in particular the production of proteins and/or enzymes which demonstrate less immunogenicity relative to their recombinantly-prepared counterparts. In a preferred embodiment of the present invention the transfer vehicles comprise mRNA which encode a deficient protein or enzyme. Upon distribution of such compositions to the target tissues and the subsequent transfection of such target cells, the exogenous mRNA loaded into the liposomal transfer vehicle (e.g., a lipid nanoparticle) may be translated in vivo to produce a functional protein or enzyme encoded by the exogenously administered mRNA (e.g., a protein or enzyme in which the subject is deficient). Accordingly, the compositions of the present invention exploit a subject's ability to translate exogenously- or recombinantly-prepared mRNA to produce an endogenously-translated protein or enzyme, and thereby produce (and where applicable excrete) a functional protein or enzyme. The expressed or translated proteins or enzymes may also be characterized by the in vivo inclusion of native post-translational modifications which may often be absent in recombinantly-prepared proteins or enzymes, thereby further reducing the immnunogenicity of the translated protein or enzyme.
The administration of mRNA encoding a deficient protein or enzyme avoids the need to deliver the nucleic acids to specific organelles within a target cell (e.g., mitochondria). Rather, upon transfection of a target cell and delivery of the nucleic acids to the cytoplasm of the target cell, the mRNA contents of a transfer vehicle may be translated and a functional protein or enzyme expressed.
The present invention also contemplates the discriminatory targeting of target cells and tissues by both passive and active targeting means. The phenomenon of passive targeting exploits the natural distributions patterns of a transfer vehicle in vivo without relying upon the use of additional excipients or means to enhance recognition of the transfer vehicle by target cells. For example, transfer vehicles which are subject to phagocytosis by the cells of the reticulo-endothelial system are likely to accumulate in the liver or spleen, and accordingly may provide means to passively direct the delivery of the compositions to such target cells.
Alternatively, the present invention contemplates active targeting, which involves the use of additional excipients, referred to herein as “targeting ligands” that may be bound (either covalently or non-covalently) to the transfer vehicle to encourage localization of such transfer vehicle at certain target cells or target tissues. For example, targeting may be mediated by the inclusion of one or more endogenous targeting ligands (e.g., apolipoprotein E) in or on the transfer vehicle to encourage distribution to the target cells or tissues. Recognition of the targeting ligand by the target tissues actively facilitates tissue distribution and cellular uptake of the transfer vehicle and/or its contents in the target cells and tissues (e.g., the inclusion of an apolipoprotein-E targeting ligand in or an the transfer vehicle encourages recognition and binding of the transfer vehicle to endogenous low density lipoprotein receptors expressed by hepatocytes). As provided herein, the composition can comprise a ligand capable of enhancing affinity of the composition to the target cell. Targeting ligands may be linked to the outer bilayer of the lipid particle during formulation or post-formulation. These methods are well known in the art. In addition, some lipid particle formulations may employ fusogenic polymers such as PEAA, hemagluttinin, other lipopeptides (see U.S. patent application Ser. Nos. 08/835,81, and 60/083,294, which are incorporated herein by reference) and other features useful for in vivo and/or intracellular delivery. In other some embodiments, the compositions of the present invention demonstrate improved transfection efficacies, and/or demonstrate enhanced selectivity towards target cells or tissues of interest. Contemplated therefore are compositions which comprise one or more ligands (e.g., peptides, aptamers, oligonucleotides, a vitamin or other molecules) that are capable of enhancing the affinity of the compositions and their nucleic acid contents for the target cells or tissues. Suitable ligands may optionally be bound or linked to the surface of the transfer vehicle. In some embodiments, the targeting ligand may span the surface of a transfer vehicle or be encapsulated within the transfer vehicle. Suitable ligands and are selected based upon their physical, chemical or biological properties (e.g., selective affinity and/or recognition of target cell surface markers or features). Cell-specific target sites and their corresponding targeting ligand can vary widely. Suitable targeting ligands are selected such that the unique characteristics of a target cell are exploited, thus allowing the composition to discriminate between target and non-target cells. For example, compositions of the invention may include surface markers (e.g., apolipoprotein-B or apolipoprotein-E) that selectively enhance recognition of, or affinity to hepatocytes (e.g., by receptor-mediated recognition of and binding to such surface markers). Additionally, the use of galactose as a targeting ligand would be expected to direct the compositions of the present invention to parenchymal hepatocytes, or alternatively the use of mannose containing sugar residues as a targeting ligand would be expected to direct the compositions of the present invention to liver endothelial cells (e.g., mannose containing sugar residues that may bind preferentially to the asialoglycoprotein receptor present in hepatocytes), (See Hillery A M, et al. “Drug Delivery and Targeting: For Pharmacists and Pharmaceutical Scientists” (2002) Taylor & Francis, Inc.) The presentation of such targeting ligands that have been conjugated to moieties present in the transfer vehicle (e.g., a lipid nanoparticle) therefore facilitate recognition and uptake of the compositions of the present invention in target cells and tissues. Examples of suitable targeting ligands include one or more peptides, proteins, aptamers, vitamins and oligonucleotides.
As used herein, the term “subject” refers to any animal (e.g., a mammal), including, but not limited to, humans, non-human primates, rodents, and the like, to which the compositions and methods of the present invention are administered. Typically, the terms “subject” and “patient” are used interchangeably herein in reference to a human subject.
The compositions and methods of the invention provide for the delivery of mRNA to treat a number of disorders. In particular, the compositions and methods of the present invention are suitable for the treatment of diseases or disorders relating to the deficiency of proteins and/or enzymes that are excreted or secreted by the target cell into the surrounding extracellular fluid (e.g., mRNA encoding hormones and neurotransmitters). In embodiments the disease may involve a defect or deficiency in a secreted protein (e.g., Fabry disease, or ALS). In certain embodiments, the disease may not be caused by a defect or deficit in a secreted protein, but may benefit from providing a secreted protein. For example, the symptoms of a disease may be unproved by providing the compositions of the invention (e.g. cystic fibrosis). Disorders for which the present invention are useful include, but are not limited to, disorders such as Huntington's Disease; Parkinson's Disease; muscular dystrophies (such as, e.g. Duchenne and Becker); hemophelia diseases (such as, e.g., hemophilioa B (FIX), hemophilia A (FVIII); SMN1-related spinal muscular atrophy (SMA); amyotrophic lateral sclerosis (ALS); GALT-related galactosemia; Cystic Fibrosis (CF); SLC3A1-related disorders including cystinuria; COL4A5-related disorders including Alport syndrome; galactocerehrosidase deficiencies; X-linked adrenoleukodystrophy and adrenomyeloneuropathy; Friedreich's ataxia; Pelizaeus-Merzbacher disease; TSC1and TSC2-related tuberous sclerosis; Sanfilippo B syndrome (MPS IIIB), CTNS-related cystinosis; the FMR1-related disorders which include Fragile X syndrome, Fragile X-Associated Tremor/Ataxia Syndrome and Fragle X Premature Ovarian Failure Syndrome; Prader-Willi syndrome; hereditary hemorrhagic telangiectasia (AT); Niemann-Pick disease Type C1; the neuronal ceroid lipofuscinoses-related diseases including Juvenile Neuronal Ceroid Lipofuscinosis (JNCL), Juvenile Batten disease, Santavuori-Haltia disease, Jansky-Bielschowsky disease, and PTT-1 and TPP1 deficiencies; EIF2B1, EIF2B2, EIF2B3, EIF2B4 and EIF2B5-related childhood ataxia with central nervous system hypomyelination/vanishing white matter; CACNA1A and CACNB4-related Episodic Ataxia Type 2; the MECP2-related disorders including Classic Rett Syndrome, MECP2-related Severe Neonatal Encephalopathy and PPM-X Syndrome; CDKL5-related Atypical Rett Syndrome; Kennedy's disease (SBMA); Notch-3 related cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy (CADASIL); SCNIA and SCNIB-related seizure disorders; the Polymerase G-related disorders which include Alpers-Huttenlocher syndrome, POLG-related sensory ataxic neuropathy, dysarthria, and ophthalmoparesis, and autosomal dominant and recessive progressive external ophthalmoplegia with mitochondrial DNA deletions; X-Linked adrenal hypoplasia, X-linked agammaglobulinemia; Wilson's disease; and Fabry Disease. In one embodiment, the nucleic acids, and in particular mRNA, of the invention may encode functional proteins or enzymes that are secreted into extracelluar space. For example, the secreted proteins include clotting factors, components of the complement pathway, cytokines, chemokines, chemoattractants, protein hormones (e.g. EGF, PDF), protein components of serum, antibodies, secretable toll-like receptors, and others. In some embodiments, the compositions of the present invention may include mRNA encoding enythropotetin, α1-antitrypsin, carboxypeptidase N or human growth hormone.
In embodiments, the invention encodes a secreted protein that is made up of subunits that are encoded by more than one gene. For example, the secreted protein may be a heterodimer, wherein each chain or subunit of the is encoded by a separate gene. It is possible that more than one mRNA molecule is delivered in the transfer vehicle and the mRNA encodes separate subunit of the secreted protein. Alternatively, a single mRNA may be engineered to encode more than one subunit (e.g., in the case of a single-chain Fv antibody). In certain embodiments, separate mRNA molecules encoding the individual subunits may be administered in separate transfer vehicles. In one embodiment, the mRNA may encode full length antibodies (both heavy and light chains of the variable and constant regions) or fragments of antibodies (e.g. Fab, Fv, or a single chain Fv (scFv) to confer immunity to a subject. While one embodiment of the present invention relates to methods and compositions useful for conferring immunity to a subject (e.g., via the translation of mRNA encoding functional antibodies), the inventions disclosed herein and contemplated hereby are broadly applicable. In an alternative embodiment the compositions of the present invention encode antibodies that may be used to transiently or chronically effect a functional response in subjects. For example, the mRNA of the present invention may encode a functional monoclonal or polyclonal antibody, which upon translation and secretion from target cell may be useful for targeting and/or inactivating a biological target (e.g., a stimulatory cytokine such as tumor necrosis factor). Similarly, the mRNA nucleic acids of the present invention may encode, for example, functional anti-nephritic factor antibodies useful for the treatment of membranoprolifeative glomerulonephritis type II or acute hemolytic uremic syndrome, or alternatively may encode anti-vascular endothelial growth factor (VEGF) antibodies useful for the treatment of VEGF-mediated diseases, such as cancer. In other embodiments, the secreted protein is a cytokine or other secreted protein comprised of more than one subunit (e.g., IL-12, or IL-23).
The compositions of the invention can be administered to a subject. In some embodiments, the composition is formulated in combination with one or more additional nucleic acids, carriers, targeting ligands or stabilizing reagents, or in pharmacological compositions where it is mixed with suitable excipients. For example, in one embodiment, the compositions of the invention may be prepared to deliver mRNA encoding two or more distinct proteins or enzymes. Techniques for formulation and administration of drugs may be found in “Remington's Pharmaceutical Sciences,” Mack Publishing Co., Easton, Pa., latest edition.
A wide range of molecules that can exert pharmaceutical or therapeutic effects can be delivered into target cells using compositions and methods of the invention. The molecules can be organic or inorganic. Organic molecules can be peptides, proteins, carbohydrates, lipids, sterols, nucleic acids (including peptide nucleic acids), or any combination thereof. A formulation for delivery into target cells can comprise more than one type of molecule, for example, two different nucleotide sequences, or a protein, an enzyme or a steroid.
The compositions of the present invention may be administered and dosed in accordance with current medical practice, taking into account the clinical condition of the subject, the site and method of administration, the scheduling of administration, the subject's age, sex, body weight and other factors relevant to clinicians of ordinary skill in the art. The “effective amount” for the purposes herein may be determined by such relevant considerations as are known to those of ordinary skill in experimental clinical research, pharmacological, clinical and medical arts. In some embodiments, the amount administered is effective to achieve at least some stabilization, improvement or elimination of symptoms and other indicators as are selected as appropriate measures of disease progress, regression or improvement by those of skill in the art. For example, a suitable amount and dosing regimen is one that causes at least transient protein production.
Suitable routes of administration include, for example, oral, rectal, vaginal, transmucosal, pulmonary including intratracheal or inhaled, or intestinal administration; parenteral delivery, including intramuscular, subcutaneous, intramedullary injections, as well as intrathecal, direct intraventricular, intravenous, intraperitoneal, intranasal, or intraocular injections.
Alternately, the compositions of the invention may be administered in a local rather than systemic manner, for example, via injection of the pharmaceutical composition directly into a targeted tissue, preferably in a sustained release formulation. Local delivery can be affected in various ways, depending on the tissue to be targeted. For example, aerosols containing compositions of the present invention can be inhaled (for nasal, tracheal, or bronchial delivery); compositions of the present invention can be injected into the site of injury, disease manifestation, or pain, for example, compositions can be provided in lozenges for oral, tracheal, or esophageal application; can be supplied in liquid, tablet or capsule form for administration to the stomach or intestines, can be supplied in suppository form for rectal or vaginal application; or can even be delivered to the eye by use of creams, drops, or even injection. Formulations containing compositions of the present invention complexed with therapeutic molecules or ligands can even be surgically administered, for example in association with a polymer or other structure or substance that can allow the compositions to diffuse from the site of implantation to surrounding cells. Alternatively, they can be applied surgically without the use of polymers or supports.
In one embodiment the compositions of the invention are formulated such that they are suitable for extended-release of the mRNA contained therein. Such extended-release compositions may be conveniently administered to a subject at extended dosing intervals. For example, in one embodiment, the compositions of the present invention are administered to a subject twice day, daily or every other day. In a preferred embodiment, the compositions of the present invention are administered to a subject twice a week, once a week, every ten days, every two weeks, every three weeks, or more preferably every four weeks, once a month, every six weeks, every eight weeks, ever other month, every three months, every four months, every six months, every eight months, every nine months or annually. Also contemplated are compositions and liposomal vehicles which are formulated for depot administration (e.g., intramuscularly, subcutaneously, intravitreally) to either deliver or release a mRNA over extended periods of time. Preferably, the extended-release means employed are combined with modifications made to the mRNA to enhance stability.
Also contemplated herein are lyophilized pharmaceutical compositions comprising one or more of the liposomal nanoparticles disclosed herein and related methods for the use of such lyophilized compositions as disclosed for example, in U.S. Provisional Application No. 61/401,882, filed Jun. 8, 2011, the teachings of which are incorporated herein by reference in their entirety. For example, lyophilized pharmaceutical compositions according to the invention may be reconstituted prior to administration or can be reconstituted in vivo. For example, a lyophilized pharmaceutical composition can be formulated in an appropriate dosage form (e.g., an intradermal dosage form such as a disk, rod or membrane) and administered such that the dosage form is rehydrated over time in vivo by the individual's bodily fluids.
While certain compounds, compositions and methods of the present invention have been described with specificity in accordance with certain embodiments, the following examples serve only to illustrate the compounds of the invention and are not intended to limit the same. Each of the publications, reference materials, accession numbers and the like referenced herein to describe the background of the invention and to provide additional detail regarding its practice are hereby incorporated by reference in their entirety.
The articles “a” and “an” as used herein in the specification and in the claims, unless clearly indicated to the contrary, should be understood to include the plural referents. Claims or descriptions that include “or” between one or more members of a group are considered satisfied if one, more than one, or all of the group members are present in, employed in, or otherwise relevant to a given product or process unless indicated to the contrary or otherwise evident from the context. The invention includes embodiments in which exactly one member of the group is present in, employed in, or otherwise relevant to a given product or process. The invention also includes embodiments in which more than one, or the entire group members are present in, employed in, or otherwise relevant to a given product or process. Furthermore, it is to be understood that the invention encompasses all variations, combinations, and permutations in which one or more limitations, elements, clauses, descriptive terms, etc., from one or more of the listed claims is introduced into another claim dependent on the same base claim (or, as relevant, any other claim) unless otherwise indicated or unless it would be evident to one of ordinary skill in the art that a contradiction or inconsistency would arise. Where elements are presented as lists, (e.g., in Markush group or similar format) it is to be understood that each subgroup of the elements is also disclosed, and any element(s) can be removed from the group. It should be understood that, in general, where the invention, or aspects of the invention, is/are referred to as comprising particular elements, features, etc., certain embodiments of the invention or aspects of the invention consist, or consist essentially of, such elements, features, etc. For purposes of simplicity those embodiments have not in every case been specifically set forth in so many words herein. It should also be understood that any embodiment or aspect of the invention can be explicitly excluded from the claims, regardless of whether the specific exclusion is recited in the specification. The publications and other reference materials referenced herein to describe the background of the invention and to provide additional detail regarding its practice are hereby incorporated by reference.
Messenger RNA
Human erythropoietin (EPO) (SEQ. ID NO: 3;
Lipid Nanoparticle Formulations
Formulation 1: Aliquots of 50 mg/mL ethanolic solutions of C12-200, DOPE, Chol and DMG-PEG2K (40:30:25:5) were mixed and diluted with ethanol to 3 mL final volume. Separately, an aqueous buffered solution (10 mM citrate/150 mM NaCl, pH 4.5) of mRNA was prepared from a 1 mg/mL stock. The lipid solution was injected rapidly into the aqueous mRNA solution and shaken to yield a final suspension in 20% ethanol. The resulting nanoparticle suspension was filtered, diafiltrated with 1×PBS (pH 7.4), concentrated and stored at 2-8° C.
Formulation 2: Aliquots of 50 mg/mL ethanolic solutions of DODAP, DOPE, cholesterol and DMG-PEG2K (18:56:20:6) were mixed and diluted with ethanol to 3 mL final volume. Separately, an aqueous buffered solution (10 mM citrate/150 mM NaCl pH 4.5) of EPO mRNA was prepared from a 1 mg/mL stock. The lipid solution was injected rapidly into the aqueous mRNA solution and shaken to yield a final suspension in 20% ethanol. The resulting nanoparticle suspension was filtered, diafiltrated with 1×PBS (pH 7.4), concentrated and stored at 2-8° C. Final concentration=1.35 mg/mL EPO mRNA (encapsulated). Zave=75.9 nm (Dv(50)=57.3 nm; Dv(90)=92.1 nm).
Formulation 3: Aliquots of 50mg/mL ethanolic solutions of HGT4003, DOPE, cholesterol and DMG-PEG2K (50:25:20:5) were mixed and diluted with ethanol to 3 mL final volume. Separately, an aqueous buffered solution (10 mM citrate/150 mM NaCl, pH 4.5) of mRNA was prepared from a 1 mg/mL stock. The lipid solution was injected rapidly into the aqueous mRNA solution and shaken to yield a final suspension in 20% ethanol. The resulting nanoparticle suspension was filtered, diafiltrated with 1×PBS (pH 7.4), concentrated and stored at 2-8° C.
Formulation 4: Aliquots of 50 mg/mL ethanolic solutions of ICE, DOPE and DMG-PEG2K (70:25:5) were mixed and diluted with ethanol to 3 mL final volume. Separately, an aqueous buffered solution (10mM citrate/150 mM NaCl, pH 4.5) of mRNA was prepared from a 1 mg/mL stock. The lipid solution was injected rapidly into the aqueous mRNA solution and shaken to yield a final suspension in 20% ethanol. The resulting nanoparticle suspension was filtered, diafiltrated with 1×PBS pH 7.4), concentrated and stored at 2-8° C.
Formulation 5: Aliquots of 50 mg/mL ethanolic solutions of HGT5000, DOPE, cholesterol and DMG-PEG2K (40:20:35:5) were mixed and diluted with ethanol to 3 mL final volume. Separately, an aqueous buffered solution (10 mM citrate/150 mM NaCl, pH 4.5) of EPO mRNA was prepared from a 1 mg/mL stock. The lipid solution was injected rapidly into the aqueous mRNA solution and shaken to yield a final suspension in 20% ethanol. The resulting nanoparticle suspension was filtered, diafiltrated with 1×PBS (pH 7.4), concentrated and stored at 2-8° C. Final concentration=1.82 mg/mL EPO mRNA (encapsulated). Zave=105.6 nm (Dv(50)=53.7 nm; Dv(90)=157 nm).
Formulation 6: Aliquots of 50mg/mL ethanolic solutions of HGT5001, DOPE, cholesterol and DMG-PEG2K (40:20:35:5) were mixed and diluted with ethanol to 3 mL final volume. Separately, an aqueous buffered solution (10 mM citrate/150 mM NaCl, pH 4.5) of EPO mRNA was prepared from a 1 mg/mL stock. The lipid solution was injected rapidly into the aqueous mRNA solution and shaken to yield a final suspension in 20% ethanol. The resulting nanoparticle suspension was filtered, diafiltrated with 1×PBS (pH 7.4), concentrated and stored at 2-8° C.
Analysis of Protein Produced Via Intravenously Delivered mRNA-Loaded Nanoparticles Injection Protocol
Studies were performed using male CD-1 mice of approximately 6-8 weeks of age at the beginning of each experiment, unless others-vise indicated. Samples were introduced by a single bolus tail-vein injection of an equivalent total dose of 30-200 micrograms of encapsulated mRNA. Mice were sacrificed and per fused with saline at the designated time points.
Isolation of Organ Tissues for Analysis
The liver and spleen of each mouse was harvested, apportioned into three parts, and stored in either 10% neutral buffered formalin or snap-frozen and stored at −80° C. for analysis.
Isolation of Serum for Analysis
All animals were euthanized by CO2 asphyxiation 48 hours post dose administration (±5%) followed by thoracotomy and terminal cardiac blood collection. Whole blood (maximal obtainable volume) was collected via cardiac puncture on euthanized animals into serum separator tubes, allowed to clot at room temperature for at least 30 minutes, centrifuged at 22° C.±5° C. at 9300 g for 10 minutes, and the serum extracted. For interim blood collections, approximately 40-50 μL of whole blood was collected via facial vein puncture or tail snip. Samples collected from non treatment animals were used as a baseline for comparison to study animals.
Enzyme-Linked Immunosorbent Assay (ELISA) Analysis
EPO ELISA: Quantification of EPO protein was performed following procedures reported for human EPO MASA kit (Quantikine IVD, R&D Systems, Catalog #Dep-00). Positive controls employed consisted of ultrapure and tissue culture grade recombinant human erythropoietin protein (R&D Systems, Catalog #286-EP and 287-TC respectively). Detection was monitored via absorption (450 nm) on a Molecular Device Flex Station instrument
GLA ELISA: Standard ELISA procedures were followed employing sheep anti-Alpha-galactosidase G-188 IgG as the capture antibody with rabbit anti-Alpha-galactosidase TK-88 IgG as the secondary (detection) antibody (Shire Human Genetic Therapies). Horseradish peroxidase (HRP)-conjugated goat anti-rabbit IgG was used for activation of the 3,3′5,5′-tetramethylbenzidine (TMB) substrate solution. The reaction was quenched using 2N H2SO4 after 20 minutes. Detection was monitored via absorption (450 nm) on a Molecular Device Flex Station instrument. Untreated mouse serum and human Alpha-galactosidase protein were used as negative and positive controls, respectively.
FIX ELISA: Quantification of FIX protein was performed following procedures reported for human FIX ELISA kit (AssayMax, Assay Pro, Catalog #EF1009-1).
A1AT ELISA: Quantification of A1AT protein was performed following procedures reported for human A1AT ELISA kit (Innovative Research, Catalog #IRAPKT015).
Western Blot Analysis
(EPO): Western blot analyses were performed using an anti-hEPO antibody (R&D Systems #MAB2871) and ultrapure human EPO protein (R&D Systems #286-EP) as the control.
Results
The work described in this example demonstrates the use of mRNA-encapsulated lipid nanoparticles as a depot source for the production of protein. Such a depot effect can be achieved in multiple sites within the body (i.e., liver, kidney, spleen, and muscle). Measurement of the desired exogenous-based protein derived front messenger RNA delivered via liposomal nanoparticles was achieved and quantified, and the secretion of protein from a depot using human erythropoietin (hEPO), human alpha-galactosidase (hGLA), human alpha-1 antitrypsin (hA1AT), and human Factor IX (hFIX) mRNA was demonstrated.
IA. In Vivo Human EPO Protein Production Results
The production of hEPO protein was demonstrated with various lipid nanoparticle formulations. Of four different cationic lipid systems, C12-200-based lipid nanoparticles produced the highest quantity of hEPO protein after four hours post intravenous administration as measured by ELISA (
Of the lipid systems tested, the DODAP-based lipid nanoparticle formulation was the least effective. However, the observed quantity of human EPO protein derived from delivery via a DODAP-based lipid nanoparticle encapsulating EPO mRNA was 4.1 ng/mL, which is still greater than 30-fold over normal physiological levels of EPO protein (Table 1).
In addition, the resulting protein was tested to determine if it was active and functioned properly. In the case of mRNA replacement therapy (MRT) employing hEPO mRNA, hematocrit changes were monitored over a ten day period for five different lipid nanoparticle formulations (
In another experiment, hematocrit changes were monitored over a 15-day period (
aBlood samples were collected into non-heparinized hematocrit tubes.
IB. In Vivo Human GLA Protein Production Results
A second exogenous-based protein system was explored to demonstrate the “depot effect” when employing mRNA-loaded lipid nanoparticles. Animals were injected intravenously with a single 30 microgram dose of encapsulated human alpha-galactosidase (hGLA) mRNA using a C12-200-based lipid nanoparticle system and sacrificed after six hours (Formulation 1). Quantification of secreted hGLA protein was per via ELISA. Untreated mouse serum and human Alpha-galactosidase protein were used as controls. Detection of human alpha-galactosidase protein was monitored over a 48 hour period.
Measurable levels of hGLA protein were observed throughout the time course of the experiment with a maximum level of 2.0 ug/mL hGLA protein at six hours (
In addition, the half-life of Alpha-galactosidase when administered at 0.2 mg/kg is approximately 108 minutes, Production of GLA protein via the “depot effect” when administering GLA mRNA-loaded lipid nanoparticles shows a substantial increase in blood residence time when compared to direct injection of the naked recombinant protein. As described above, significant quantities of protein are present after 48 hours.
The activity profile of the α-galactosidase protein produced from GLA mRNA-loaded lipid nanoparticles was measured as a function of 4-methylumbelliferyl-α-D-galactopyranoside (4-MU-α-gal) metabolism. As shown in
aData were from a published paper (Gregory M. Pastores et al. Safety and Pharmacokinetics of hGLA in patients with Fabry disease and end-stage renal disease. Nephrol Dial Transplant (2007) 22: 1920-1925.
bnon-end-stage renal disease.
cα-Galactosidase activity at 6 hours after dosing (the earliest time point tested in the study).
The ability of mRNA encapsulated lipid nanoparticles to target organs which can act as a depot for the production of a desired protein has been demonstrated. The levels of secreted protein observed have been several orders of magnitude above normal physiological levels. This “depot effect” is repeatable.
An analysis of tissues isolated from this same experiment provided insight into the distribution of hGLA protein in hGLA MRT-treated mice (
In addition, the production of hGLA upon administration of hGLA mRNA loaded C12-200 nanoparticles was shown to exhibit a dose a response in the serum (
One inherent characteristic of lipid nanoparticle-mediated mRNA replacement therapy would be the pharmacokinetic profile of the respective protein produced. For example, ERT-based treatment of mice employing Alpha-galactosidase results in a plasma half-life of approximately 100 minutes. In contrast, MRT-derived alpha-galactosidase has a blood residence time of approximately 72 hrs with a peak time of 6 hours. This allows for much greater exposure for organs to participate in possible continuous uptake of the desired protein. A comparison of PK profiles is shown in
In a separate experiment, hGLA MRT was applied to a mouse disease model, hGLA KO mice (Fabry mice). A 0.33 mg/kg dose of hGLA mRNA-loaded C12-200-based lipid nanoparticles (Formulation 1) was administered to female KO mice as a single, intravenous injection. Substantial quantities of MRT-derived hGLA protein were produced with a peak at 6 hr (˜560% ng/mL serum) which is approximately 600-fold higher than normal physiological levels. Further, hGLA protein was still detectable 72 hr post-administration (
Quantification of MRT-derived GLA protein in vital organs demonstrated substantial accumulation as shown in
In a subsequent experiment, a comparison of ERT-based Alpha-galactosidase treatment versus hGLA MRT-based treatment of male Fabry KO mice was conducted. A single, intravenous dose of 1.0 mg/kg was given for each therapy and the mice were sacrificed one week post-administration. Serum levels of hGLA protein were monitored at 6 hr and 1 week post-injection. Liver, kidney, spleen, and heart were analyzed for hGLA protein accumulation one week post-administration. In addition to the biodistribution analyses, a measure of efficacy was determined via measurement of globotrioasylceramide (Gb3) and lyso-Gb3 reductions in the kidney and heart.
The Fabry mice in this experiment were sacrificed one week after the initial injection and the organs were harvested and analyzed (liver, kidney, spleen, heart).
In addition to the biodistribution analyses conducted, evaluations of efficacy were determined via measurement of globotrioasylceramide (Gb3) and lyso-Gb3 levels in key organs. A direct comparison of Gb3 reduction after a single, intravenous 1.0 mg/kg GLA MRT treatment as compared to a Alpha-galactosidase ERT-based therapy of an equivalent dose yielded a sizeable difference in levels of Gb3 in the kidneys as well as heart. For example. Gb3 levels for GLA MRT versus Alpha-galactosidase yielded reductions of 60.2% vs 26.8%, respectively (
A second relevant biomarker for measurement of efficacy is lyso-Gb3. GLA MRT reduced lyso-Gb3 more efficiently than Alpha-galactosidase as well in the kidneys and heart (
The results with for hGLA in C12-200 based lipid nanoparticles extend to other lipid nanoparticle formulations. For example, hGLA mRNA loaded into HGT4003 (Formulation 3) or HGT5000-based (Formulation 5) lipid nanoparticles administed as a single dose IV result in production of hGLA at 24 hours post administration (
Overall, mRNA replacement therapy applied as a depot for protein production produces large quantities of active, functionally therapeutic protein at supraphysiological levels. This method has been demonstrated to yield a sustained circulation half-life of the desired protein and this MRT-derived protein is highly efficacious for therapy as demonstrated with alpha-galactosidase enzyme in Fabry mice.
IC. In Vivo Human FIX Protein Production Results
Studies were performed administering Factor IX (FIX) mRNA-loaded lipid nanoparticles in wild type mice (CD-1) and determining FIX protein that is secreted into the bloodstream. Upon intravenous injection of a single dose of 30 μug C12-200-based (C12-200:DOPE:Chol:PEG at a ratio of 40:30:25:5) FIX mRNA-loaded lipid nanoparticles (dose based on encapsulated mRNA) (Formulation 1), a robust protein production was observed (
A pharmacokinetic analysis over 72 hours showed MRT-derived FIX protein could be detected at all timepoints tested (
ID. In Vivo Human A1AT Protein Production Result
Studies were performed administering alpha-1-antitrypsin (A1AT) mRNA-loaded lipid nanoparticles in wild type mice (CD-1) and determining A1AT protein that is secreted into the bloodstream. Upon intravenous injection of a single dose of 30 ug C12-200-based A1AT mRNA-loaded lipid nanoparticles (dose based on encapsulated mRNA) (Formulation 1), a robust protein production was observed (
As depicted in
Injection Prolocol
All studies were performed using female CD-1 or BALB/C mice of approximately 7-10 weeks of age at the beginning of each experiment. Test articles were introduced via a single intratracheal aerosolized administration. Mice were sacrificed and perfused with saline at the designated time points. The lungs of each mouse were harvested, apportioned into two parts, and stored in either 10% neutral buffered formalin or snap-frozen and stored at −80° C. for analysis. Serum was isolated as described in Example 1. EPO ELISA: as described in Example 1.
Results
The depot effect can be achieved via pulmonary delivery (e.g. intranasal, intratracheal, nebulization). Measurement of the desired exogenous-based protein derived from messenger RNA delivered via nanoparticle systems was achieved and quantified.
The production of human EPO protein via hEPO mRNA-loaded nanoparticles was tested in CD-1 mice via a single intratracheal administration (MicroSprayer®). Several formulations were tested using various cationic lipids (Formulations 1, 5, 6). All formulations resulted in high encapsulation of human EPO mRNA. Upon administration, animals were sacrificed six hours post-administration and the lungs as well as serum were harvested.
Human EPO protein was detected at the site of administration (lungs) upon treatment via aerosol delivery. Analysis of the serum six hours post-administration showed detectable amounts of hEPO protein in circulation. These data (shown in
The present application is a divisional application of U.S. application Ser. No. 17/558,310 filed Dec. 21, 2021, now allowed, which is a divisional application of U.S. application Ser. No. 17/509,674 filed Oct. 25, 2021, issued as U.S. Pat. No. 11,291,734, which is a divisional application of U.S. application Ser. No. 17/341,016 filed Jun. 7, 2021, issued as U.S. Pat. No. 11,185,595, which is a divisional application of U.S. application Ser. No. 17/099,462 filed Nov. 16, 2020, issued as U.S. Pat. No. 11,052,159, which is a divisional application of U.S. application Ser. No. 16/931,231 filed Jul. 16, 2020, issued as U.S. Pat. No. 10,888,626, which is a divisional application of U.S. application Ser. No. 16/681,565 filed Nov. 12, 2019, now abandoned, which is a divisional application of U.S. application Ser. No. 16/502,672 filed Jul. 3, 2019, issued as U.S. Pat. No. 10,507,249, which is a divisional application of U.S. application Ser. No. 16/286,400 filed on Feb. 26, 2019, issued as U.S. Pat. No. 10,350,303 on Jul. 16, 2019, which is a divisional application of U.S. application Ser. No. 16/233,031 filed on Dec. 26, 2018, now issued as U.S. Pat. No. 10,413,618, which is a divisional application of U.S. application Ser. No. 15/482,117 filed on Apr. 7, 2017, now issued as U.S. Pat. No. 10,238,754, which is a divisional application of U.S. application Ser. No. 14/124,608 filed on Mar. 5, 2014, now abandoned, which is a U.S. National Entry claiming priority to International Application PCT/US2012/041724 filed on Jun. 8, 2012, which claims priority to U.S. Provisional Application Serial No. 61/494,881 filed Jun. 8, 2011, the disclosures of which are hereby incorporated by reference.
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