Patent Grant
11896669
The 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 Sep. 4, 2020, is named 709789_UM9-213DIVCON_ST25.txt and is 10,356 bytes in size.
This disclosure relates to novel branched oligonucleotides designed to achieve unexpectedly high efficacy, uptake and tissue distribution.
Therapeutic oligonucleotides are simple and effective tools for a variety of applications, including the inhibition of gene function. An example of such inhibition is RNA interference (RNAi). The promise of RNAi as a general therapeutic strategy, however, depends on the ability to deliver small RNAs to a wide range of tissues. Currently, small therapeutic RNAs can only be delivered effectively to liver. There remains a need for self-delivering siRNA, and therapeutic oligonucleotides in general, that exhibit minimal immune response and off-target effects, efficient cellular uptake without formulation, and efficient and specific tissue distribution.
Accordingly, the present disclosure provides branched oligonucleotides (“compounds of the invention”) exhibiting unexpected improvement in distribution, in vivo efficacy and safety.
In a first aspect, provided herein is a branched oligonucleotide compound comprising two or more nucleic acids, the nucleic acids are connected to one another by one or more moieties selected from a linker, a spacer and a branching point.
In an embodiment, the branched oligonucleotide comprises 2, 3, 4, 6 or 8 nucleic acids.
In an embodiment of the branched oligonucleotide, each nucleic acid is single-stranded and has a 5′ end and a 3′ end, and each nucleic acid is independently connected to a linker, a spacer, or a branching point at the 5′ end or at the 3′ end.
In an embodiment, each single-stranded nucleic acid independently comprises at least 15 contiguous nucleotides. In an embodiment, the antisense strand comprises at least 15, at least 16, at least 17, at least 18, at least 19, or at least 20 contiguous nucleotides, and has complementarity to a target.
In an embodiment, each nucleic acid comprises one or more chemically-modified nucleotides. In an embodiment, each nucleic acid consists of chemically-modified nucleotides.
In an embodiment of the branched oligonucleotide, each nucleic acid is double-stranded and comprises a sense strand and an antisense strand, the sense strand and the antisense strand each have a 5′ end and a 3′ end. In an embodiment, each double-stranded nucleic acid is independently connected to a linker, spacer or branching point at the 3′ end or at the 5′ end of the sense strand or the antisense strand.
In an embodiment, the sense strand and the antisense strand each comprise one or more chemically-modified nucleotides. In an embodiment, the sense strand and the antisense strand each consist of chemically-modified nucleotides. In an embodiment, the sense strand and the antisense strand both comprise alternating 2′-methoxy-nucleotides and 2′-fluoro-nucleotides. In an embodiment, the nucleotides at positions 1 and 2 from the 5′ end of the sense and antisense strands are connected to adjacent nucleotides via phosphorothioate linkages. In an embodiment, the nucleotides at positions 1-6 from the 3′ end, or positions 1-7 from the 3′ end, are connected to adjacent nucleotides via phosphorothioate linkages.
In an embodiment, the branched oligonucleotide further comprises a hydrophobic moiety. In a particular embodiment, the hydrophobic moiety is attached to one or more terminal 5′ positions of the branched oligonucleotide compound. The hydrophobic moiety may be comprised within one or more 5′ phosphate moieties. In certain embodiments, the hydrophobic moiety comprises an alkyl or alkenyl moiety (e.g., an alkyl or alkenyl chain, or a saturated or unsaturated fatty acid residue), a vitamin or cholesterol derivative, an aromatic moiety (e.g., phenyl or naphthyl), a lipophilic amino acid or a combination thereof. Certain embodiments of hydrophobic moieties, and strategies for synthesizing hydrophobically modified branched oligonucleotide compounds, are depicted in
In an embodiment of the branched oligonucleotide, each linker is independently selected from an ethylene glycol chain, an alkyl chain, a peptide, RNA, DNA, a phosphate, a phosphonate, a phosphoramidate, an ester, an amide, a triazole, and combinations thereof any carbon or oxygen atom of the linker is optionally replaced with a nitrogen atom, bears a hydroxyl substituent, or bears an oxo substituent.
In a second aspect, provided herein is a compound of formula (I):
L-(N)n (I)
L is selected from an ethylene glycol chain, an alkyl chain, a peptide, RNA, DNA, a phosphate, a phosphonate, a phosphoramidate, an ester, an amide, a triazole, and combinations thereof, formula (I) optionally further comprises one or more branch point B, and one or more spacer S; B is independently for each occurrence a polyvalent organic species or derivative thereof; S is independently for each occurrence selected from an ethylene glycol chain, an alkyl chain, a peptide, RNA, DNA, a phosphate, a phosphonate, a phosphoramidate, an ester, an amide, a triazole, and combinations thereof; N is an RNA duplex comprising a sense strand and an antisense strand, the sense strand and antisense strand each independently comprise one or more chemical modifications; and n is 2, 3, 4, 5, 6, 7 or 8.
In an embodiment, the compound of formula (I) has a structure selected from formulas (I-1)-(I-9) of Table 1.
In an embodiment, each antisense strand independently comprises a 5′ terminal group R selected from the groups of Table 2.
In an embodiment, the compound of formula (I) the structure of formula (II):
X, for each occurrence, independently, is selected from adenosine, guanosine, uridine, cytidine, and chemically-modified derivatives thereof; Y, for each occurrence, independently, is selected from adenosine, guanosine, uridine, cytidine, and chemically-modified derivatives thereof; - represents a phosphodiester intemucleoside linkage; = represents a phosphorothioate internucleoside linkage; and --- represents, individually for each occurrence, a base-pairing interaction or a mismatch.
In an embodiment, the compound of formula (I) has the structure of formula (III):
X, for each occurrence, independently, is a nucleotide comprising a 2′-deoxy-2′-fluoro modification; X, for each occurrence, independently, is a nucleotide comprising a 2′-O-methyl modification; Y, for each occurrence, independently, is a nucleotide comprising a 2′-deoxy-2′-fluoro modification; and Y, for each occurrence, independently, is a nucleotide comprising a 2′-O-methyl modification.
In an embodiment, the compound of formula (I) has the structure of formula (IV) (SEQ ID NOS 1 and 2, respectively, in order of appearance):
A is an adenosine comprising a 2′-deoxy-2′-fluoro modification; A is an adenosine comprising a 2′-O-methyl modification; G is an guanosine comprising a 2′-deoxy-2′-fluoro modification; G is an guanosine comprising a 2′-O-methyl modification; U is an uridine comprising a 2′-deoxy-2′-fluoro modification; U is an uridine comprising a 2′-O-methyl modification; C is an cytidine comprising a 2′-deoxy-2′-fluoro modification; and C is an cytidine comprising a 2′-O-methyl modification.
In an embodiment, the compound of formula (I) has the structure of formula (V):
X, for each occurrence, independently, is selected from adenosine, guanosine, uridine, cytidine, and chemically-modified derivatives thereof; Y, for each occurrence, independently, is selected from adenosine, guanosine, uridine, cytidine, and chemically-modified derivatives thereof; - represents a phosphodiester internucleoside linkage; = represents a phosphorothioate internucleoside linkage; and --- represents, individually for each occurrence, a base-pairing interaction or a mismatch.
In an embodiment, the compound of formula (I) has the structure of formula (VI):
X, for each occurrence, independently, is a nucleotide comprising a 2′-deoxy-2′-fluoro modification; X, for each occurrence, independently, is a nucleotide comprising a 2′-O-methyl modification; Y, for each occurrence, independently, is a nucleotide comprising a 2′-deoxy-2′-fluoro modification; and Y, for each occurrence, independently, is a nucleotide comprising a 2′-O-methyl modification.
In an embodiment, the compound of formula (I) has the structure of formula (VII) (SEQ ID NOS 3 and 4, respectively, in order of appearance):
A is an adenosine comprising a 2′-deoxy-2′-fluoro modification; A is an adenosine comprising a 2′-O-methyl modification; G is an guanosine comprising a 2′-deoxy-2′-fluoro modification; G is an guanosine comprising a 2′-O-methyl modification; U is an uridine comprising a 2′-deoxy-2′-fluoro modification; U is an uridine comprising a 2′-O-methyl modification; C is an cytidine comprising a 2′-deoxy-2′-fluoro modification; C is an cytidine comprising a 2′-O-methyl modification; Y, for each occurrence, independently, is a nucleotide comprising a 2′-deoxy-2′-fluoro modification; and Y, for each occurrence, independently, is a nucleotide comprising a 2′-O-methyl modification.
In an embodiment of the compound of formula (I), L has the structure of L1:
In an embodiment of L1, R is R3 and n is 2.
In an embodiment of the compound of formula (I), L has the structure of L2:
In an embodiment of L2, R is R3 and n is 2.
In a third aspect, provided herein is a delivery system for therapeutic nucleic acids having the structure of formula (VIII):
L-(cNA)n (VIII)
L is selected from an ethylene glycol chain, an alkyl chain, a peptide, RNA, DNA, a phosphate, a phosphonate, a phosphoramidate, an ester, an amide, a triazole, and combinations thereof, formula (VIII) optionally further comprises one or more branch point B, and one or more spacer S; B is independently for each occurrence a polyvalent organic species or derivative thereof; S is independently for each occurrence selected from an ethylene glycol chain, an alkyl chain, a peptide, RNA, DNA, a phosphate, a phosphonate, a phosphoramidate, an ester, an amide, a triazole, and combinations thereof; each cNA, independently, is a carrier nucleic acid comprising one or more chemical modifications; and n is 2, 3, 4, 5, 6, 7 or 8.
In an embodiment, the compound of formula (VIII) has a structure selected from formulas (VIII-1)-(VIII-9) of Table 3:
In an embodiment, the compound of formulas (VIII) (including, e.g., formulas (VIII-1)-(VIII-9), each cNA independently comprises at least 15 contiguous nucleotides. In an embodiment, each cNA independently consists of chemically-modified nucleotides.
In an embodiment, the delivery system further comprises n therapeutic nucleic acids (NA), each NA is hybridized to at least one cNA.
In an embodiment, each NA independently comprises at least 16 contiguous nucleotides. In an embodiment, each NA independently comprises 16-20 contiguous nucleotides. In an embodiment, each NA comprises an unpaired overhang of at least 2 nucleotides. In an embodiment, the nucleotides of the overhang are connected via phosphorothioate linkages.
In an embodiment, each NA, independently, is selected from the group consisting of: DNA, siRNAs, antagomiRs, miRNAs, gapmers, mixmers, or guide RNAs. In an embodiment, each NA is the same. In an embodiment, each NA is not the same.
In an embodiment, the delivery system further comprising n therapeutic nucleic acids (NA) has a structure selected from formulas (I), (II), (III), (IV), (V), (VI), (VII), and embodiments thereof described herein.
In an embodiment of the delivery system, the target of delivery is selected from the group consisting of: brain, liver, skin, kidney, spleen, pancreas, colon, fat, lung, muscle, and thymus.
The present disclosure provides branched oligonucleotides (“compounds of the invention”) exhibiting unexpected improvement in distribution, in vivo efficacy and safety. The branched oligonucleotides described herein efficiently and stably delivered small RNAs to multiple regions of the brain and multiple other organs, demonstrating unprecedented efficacy of delivery that has not been previously demonstrated with unconjugated small RNAs.
The compositions described herein allow efficient, stable delivery of siRNA in order to promote potent silencing of therapeutic target genes. The compositions exhibit therapeutic potential for many hard to treat diseases and overcome present challenges in employing RNA therapeutics.
In a first aspect, provided herein is a branched oligonucleotide compound comprising two or more nucleic acids, wherein the nucleic acids are connected to one another by one or more moieties selected from a linker, a spacer and a branching point.
Provided herein in various aspects and embodiments are branched oligonucleotides, referred to as compounds of the invention. In some embodiments, compounds of the invention have two to eight oligonucleotides attached through a linker. The linker may be hydrophobic. In a particular embodiment, compounds of the invention have two to three oligonucleotides. In one embodiment, the oligonucleotides independently have substantial chemical stabilization (e.g., at least 40% of the constituent bases are chemically-modified). In a particular embodiment, the oligonucleotides have full chemical stabilization (i.e., all of the constituent bases are chemically-modified). In some embodiments, compounds of the invention comprise one or more single-stranded phosphorothioated tails, each independently having two to twenty nucleotides. In a particular embodiment, each single-stranded tail has eight to ten nucleotides.
In certain embodiments, compounds of the invention are characterized by three properties: (1) a branched structure, (2) full metabolic stabilization, and (3) the presence of a single-stranded tail comprising phosphorothioate linkers. In a particular embodiment, compounds of the invention have 2 or 3 branches. The increased overall size of the branched structures promote increased uptake. Also, without being bound by a particular theory of activity, multiple adjacent branches (e.g., 2 or 3) allow each branch to act cooperatively and thus dramatically enhance rates of internalization, trafficking and release.
Full metabolic stabilization of branched oligonucleotides of the invention results in unexpectedly high in vivo efficacy. Unstabilized branched siRNA lacks an in vivo efficacy. The presence of a single stranded tail is required for the activity of branched oligonucleotides. The phosphoroamidate functional group is crucial for the function of the di-branched oligos.
In certain embodiments, compounds of the invention are characterized by the following properties: (1) two or more branched oligonucleotides, e.g., wherein there is a non-equal number of 3′ and 5′ ends; (2) substantially chemically stabilized, e.g., wherein more than 40%, optimally 100%, of oligonucleotides are chemically modified (e.g., no RNA and optionally no DNA); and (3) phoshorothioated single oligonucleotides containing at least 3, optimally 5-20 phosphorothioated bonds.
Compounds of the invention are provided in various structurally diverse embodiments. As shown in
As shown in
The presence of a branched structure improves the level of tissue retention in the brain more than 100-fold compared to non-branched compounds of identical chemical composition, suggesting a new mechanism of cellular retention and distribution. Compounds of the invention have unexpectedly uniform distribution throughout the spinal cord and brain. Moreover, compounds of the invention exhibit unexpectedly efficient systemic delivery to a variety of tissues, and very high levels of tissue accumulation.
Compounds of the invention comprise a variety of therapeutic oligonucleotides, including including ASOs, miRNAs, miRNA inhibitors, splice switching, PMOs, PNAs. In some embodiments, compounds of the invention further comprise conjugated hydrophobic moieties and exhibit unprecedented silencing and efficacy in vitro and in vivo.
Non-limiting embodiments of branched oligonucleotide configurations are disclosed in
Variable Nucleic Acids
In an embodiment, the branched oligonucleotide comprises 2, 3, 4, 6 or 8 nucleic acids. In one embodiment, the branched oligonucleotide comprises 2 nucleic acids. In another embodiment, the branched oligonucleotide comprises 3 nucleic acids. In another embodiment, the branched oligonucleotide comprises 4 nucleic acids. In another embodiment, the branched oligonucleotide comprises 6 nucleic acids. In another embodiment, the branched oligonucleotide comprises 8 nucleic acids. In another embodiment, the branched oligonucleotide comprises 5 nucleic acids. In another embodiment, the branched oligonucleotide comprises 7 nucleic acids.
In an embodiment of the branched oligonucleotide, each nucleic acid is single-stranded and has a 5′ end and a 3′ end, and each nucleic acid is independently connected to a linker, a spacer, or a branching point at the 5′ end or at the 3′ end. In one embodiment, each nucleic acid is connected to a linker, spacer or branching point at the 3′ end. In another embodiment, each nucleic acid is connected to a linker, spacer or branching point at the 5′ end. In one embodiment, each nucleic acid is connected to a linker. In another embodiment, each nucleic acid is connected to a spacer. In another embodiment, each nucleic acid is connected to a branch point.
In an embodiment, each single-stranded nucleic acid independently comprises at least 15 contiguous nucleotides. In an embodiment, the nucleic acid comprises at least 15, at least 16, at least 17, at least 18, at least 19, or at least 20 contiguous nucleotides, and has complementarity to a target. In certain embodiments, the complementarity is >95%, >90%, >85%, >80%, >75%, >70%, >65%, >60%, >55% or >50%. In one embodiment, the nucleic acid has perfect complementarity to a target.
In an embodiment of the branched oligonucleotide, each nucleic acid is double-stranded and comprises a sense strand and an antisense strand, wherein the sense strand and the antisense strand each have a 5′ end and a 3′ end. In an embodiment, each double-stranded nucleic acid is independently connected to a linker, spacer or branching point at the 3′ end or at the 5′ end of the sense strand or the antisense strand. In one embodiment, each nucleic acid is connected to a linker, spacer or branching point at the 3′ end of the sense strand. In another embodiment, each nucleic acid is connected to a linker, spacer or branching point at the 3′ end of the antisense strand. In another embodiment, each nucleic acid is connected to a linker, spacer or branching point at the 5′ end of the sense strand. In another embodiment, each nucleic acid is connected to a linker, spacer or branching point at the 5′ end of the antisense strand. In one embodiment, each nucleic acid is connected to a linker. In another embodiment, each nucleic acid is connected to a spacer. In another embodiment, each nucleic acid is connected to a branch point.
In an embodiment, each double-stranded nucleic acid independently comprises at least 15 contiguous nucleotides. In an embodiment, the antisense strand comprises at least 15, at least 16, at least 17, at least 18, at least 19, or at least 20 contiguous nucleotides, and has complementarity to a target. In certain embodiments, the complementarity is >95%, >90%, >85%, >80%, >75%, >70%, >65%, >60%, >55% or >50%. In one embodiment, the antisense strand has perfect complementarity to a target.
Modified Nucleotides
In an embodiment, each nucleic acid comprises one or more chemically-modified nucleotides. In an embodiment, each nucleic acid consists of chemically-modified nucleotides. In certain embodiments, >95%, >90%, >85%, >80%, >75%, >70%, >65%, >60%, >55% or >50% of each nucleic acid comprises chemically-modified nucleotides.
In an embodiment, the sense strand and the antisense strand each comprise one or more chemically-modified nucleotides. In an embodiment, the sense strand and the antisense strand each consist of chemically-modified nucleotides. In an embodiment, the sense strand and the antisense strand both comprise alternating 2′-methoxy-nucleotides and 2′-fluoro-nucleotides. In an embodiment, the nucleotides at positions 1 and 2 from the 5′ end of the sense and antisense strands are connected to adjacent nucleotides via phosphorothioate linkages. In an embodiment, the nucleotides at positions 1-6 from the 3′ end, or positions 1-7 from the 3′ end, are connected to adjacent nucleotides via phosphorothioate linkages. In other embodiments, at least 5 nucleotides are connected to adjacent nucleotides via phosphorothioate linkages.
In an embodiment of the branched oligonucleotide, each linker is independently selected from an ethylene glycol chain, an alkyl chain, a peptide, RNA, DNA, a phosphate, a phosphonate, a phosphoramidate, an ester, an amide, a triazole, and combinations thereof; wherein any carbon or oxygen atom of the linker is optionally replaced with a nitrogen atom, bears a hydroxyl substituent, or bears an oxo substituent. In one embodiment, each linker is an ethylene glycol chain. In another embodiment, each linker is an alkyl chain. In another embodiment, each linker is a peptide. In another embodiment, each linker is RNA. In another embodiment, each linker is DNA. In another embodiment, each linker is a phosphate. In another embodiment, each linker is a phosphonate. In another embodiment, each linker is a phosphoramidate. In another embodiment, each linker is an ester. In another embodiment, each linker is an amide. In another embodiment, each linker is a triazole. In another embodiment, each linker is a structure selected from the formulas of
Compound of Formula (I)
In a second aspect, provided herein is a compound of formula (I):
L-(N)n (I)
wherein L is selected from an ethylene glycol chain, an alkyl chain, a peptide, RNA, DNA, a phosphate, a phosphonate, a phosphoramidate, an ester, an amide, a triazole, and combinations thereof, wherein formula (I) optionally further comprises one or more branch point B, and one or more spacer S; wherein B is independently for each occurrence a polyvalent organic species or derivative thereof; S is independently for each occurrence selected from an ethylene glycol chain, an alkyl chain, a peptide, RNA, DNA, a phosphate, a phosphonate, a phosphoramidate, an ester, an amide, a triazole, and combinations thereof;
N is an RNA duplex comprising a sense strand and an antisense strand, wherein the sense strand and antisense strand each independently comprise one or more chemical modifications; and n is 2, 3, 4, 5, 6, 7 or 8.
In an embodiment, the compound of formula (I) has a structure selected from formulas (I-1)-(I-9) of Table 1.
In one embodiment, the compound of formula (I) is formula (I-1). In another embodiment, the compound of formula (I) is formula (I-2). In another embodiment, the compound of formula (I) is formula (I-3). In another embodiment, the compound of formula (I) is formula (I-4). In another embodiment, the compound of formula (I) is formula (I-5). In another embodiment, the compound of formula (I) is formula (I-6). In another embodiment, the compound of formula (I) is formula (I-7). In another embodiment, the compound of formula (I) is formula (I-8). In another embodiment, the compound of formula (I) is formula (I-9).
In an embodiment of the compound of formula (I), each linker is independently selected from an ethylene glycol chain, an alkyl chain, a peptide, RNA, DNA, a phosphate, a phosphonate, a phosphoramidate, an ester, an amide, a triazole, and combinations thereof; wherein any carbon or oxygen atom of the linker is optionally replaced with a nitrogen atom, bears a hydroxyl substituent, or bears an oxo substituent. In one embodiment of the compound of formula (I), each linker is an ethylene glycol chain. In another embodiment, each linker is an alkyl chain. In another embodiment of the compound of formula (I), each linker is a peptide. In another embodiment of the compound of formula (I), each linker is RNA. In another embodiment of the compound of formula (I), each linker is DNA. In another embodiment of the compound of formula (I), each linker is a phosphate. In another embodiment, each linker is a phosphonate. In another embodiment of the compound of formula (I), each linker is a phosphoramidate. In another embodiment of the compound of formula (I), each linker is an ester. In another embodiment of the compound of formula (I), each linker is an amide. In another embodiment of the compound of formula (I), each linker is a triazole. In another embodiment of the compound of formula (I), each linker is a structure selected from the formulas of
In one embodiment of the compound of formula (I), B is a polyvalent organic species. In another embodiment of the compound of formula (I), B is a derivative of a polyvalent organic species. In one embodiment of the compound of formula (I), B is a triol or tetrol derivative. In another embodiment, B is a tri- or tetra-carboxylic acid derivative. In another embodiment, B is an amine derivative. In another embodiment, B is a tri- or tetra-amine derivative. In another embodiment, B is an amino acid derivative. In another embodiment of the compound of formula (I), B is selected from the formulas of
Polyvalent organic species are moieties comprising carbon and three or more valencies (i.e., points of attachment with moieties such as S, L or N, as defined above). Non-limiting examples of polyvalent organic species include triols (e.g., glycerol, phloroglucinol, and the like), tetrols (e.g., ribose, pentaerythritol, 1,2,3,5-tetrahydroxybenzene, and the like), tri-carboxylic acids (e.g., citric acid, 1,3,5-cyclohexanetricarboxylic acid, trimesic acid, and the like), tetra-carboxylic acids (e.g., ethylenediaminetetraacetic acid, pyromellitic acid, and the like), tertiary amines (e.g., tripropargylamine, triethanolamine, and the like), triamines (e.g., diethylenetriamine and the like), tetramines, and species comprising a combination of hydroxyl, thiol, amino, and/or carboxyl moieties (e.g., amino acids such as lysine, serine, cysteine, and the like).
In an embodiment of the compound of formula (I), each nucleic acid comprises one or more chemically-modified nucleotides. In an embodiment of the compound of formula (I), each nucleic acid consists of chemically-modified nucleotides. In certain embodiments of the compound of formula (I), >95%, >90%, >85%, >80%, >75%, >70%, >65%, >60%, >55% or >50% of each nucleic acid comprises chemically-modified nucleotides.
In an embodiment, each antisense strand independently comprises a 5′ terminal group R selected from the groups of Table 2.
In one embodiment, R is R1. In another embodiment, R is R2. In another embodiment, R is R3. In another embodiment, R is R4. In another embodiment, R is R5. In another embodiment, R is R6. In another embodiment, R is R7. In another embodiment, R is R8.
Structure of Formula (II)
In an embodiment, the compound of formula (I) the structure of formula (II):
wherein X, for each occurrence, independently, is selected from adenosine, guanosine, uridine, cytidine, and chemically-modified derivatives thereof; Y, for each occurrence, independently, is selected from adenosine, guanosine, uridine, cytidine, and chemically-modified derivatives thereof; - represents a phosphodiester internucleoside linkage; = represents a phosphorothioate internucleoside linkage; and --- represents, individually for each occurrence, a base-pairing interaction or a mismatch.
In certain embodiments, the structure of formula (II) does not contain mismatches. In one embodiment, the structure of formula (II) contains 1 mismatch. In another embodiment, the compound of formula (II) contains 2 mismatches. In another embodiment, the compound of formula (II) contains 3 mismatches. In another embodiment, the compound of formula (II) contains 4 mismatches. In an embodiment, each nucleic acid consists of chemically-modified nucleotides.
In certain embodiments, >95%, >90%, >85%, >80%, >75%, >70%, >65%, >60%, >55% or >50% of X's of the structure of formula (II) are chemically-modified nucleotides. In other embodiments, >95%, >90%, >85%, >80%, >75%, >70%, >65%, >60%, >55% or >50% of X's of the structure of formula (II) are chemically-modified nucleotides.
Structure of Formula (III)
In an embodiment, the compound of formula (I) has the structure of formula (III):
wherein X, for each occurrence, independently, is a nucleotide comprising a 2′-deoxy-2′-fluoro modification; X, for each occurrence, independently, is a nucleotide comprising a 2′-O-methyl modification; Y, for each occurrence, independently, is a nucleotide comprising a 2′-deoxy-2′-fluoro modification; and Y, for each occurrence, independently, is a nucleotide comprising a 2′-O-methyl modification.
In an embodiment, X is chosen from the group consisting of 2′-deoxy-2′-fluoro modified adenosine, guanosine, uridine or cytidine. In an embodiment, X is chosen from the group consisting of 2′-O-methyl modified adenosine, guanosine, uridine or cytidine. In an embodiment, Y is chosen from the group consisting of 2′-deoxy-2′-fluoro modified adenosine, guanosine, uridine or cytidine. In an embodiment, Y is chosen from the group consisting of 2′-O-methyl modified adenosine, guanosine, uridine or cytidine.
In certain embodiments, the structure of formula (III) does not contain mismatches. In one embodiment, the structure of formula (III) contains 1 mismatch. In another embodiment, the compound of formula (III) contains 2 mismatches. In another embodiment, the compound of formula (III) contains 3 mismatches. In another embodiment, the compound of formula (III) contains 4 mismatches.
Structure of Formula (IV)
In an embodiment, the compound of formula (I) has the structure of formula (IV) (SEQ ID NOS 1 and 2, respectively, in order of appearance):
wherein A is an adenosine comprising a 2′-deoxy-2′-fluoro modification; A is an adenosine comprising a 2′-O-methyl modification; G is an guanosine comprising a 2′-deoxy-2′-fluoro modification; G is an guanosine comprising a 2′-O-methyl modification; U is an uridine comprising a 2′-deoxy-2′-fluoro modification; U is an uridine comprising a 2′-O-methyl modification; C is an cytidine comprising a 2′-deoxy-2′-fluoro modification; and C is an cytidine comprising a 2′-O-methyl modification.
Structure of Formula (V)
In an embodiment, the compound of formula (I) has the structure of formula (V):
wherein X, for each occurrence, independently, is selected from adenosine, guanosine, uridine, cytidine, and chemically-modified derivatives thereof; Y, for each occurrence, independently, is selected from adenosine, guanosine, uridine, cytidine, and chemically-modified derivatives thereof; - represents a phosphodiester internucleoside linkage; = represents a phosphorothioate internucleoside linkage; and --- represents, individually for each occurrence, a base-pairing interaction or a mismatch.
In certain embodiments, the structure of formula (V) does not contain mismatches. In one embodiment, the structure of formula (V) contains 1 mismatch. In another embodiment, the compound of formula (V) contains 2 mismatches. In another embodiment, the compound of formula (V) contains 3 mismatches. In another embodiment, the compound of formula (V) contains 4 mismatches. In an embodiment, each nucleic acid consists of chemically-modified nucleotides.
In certain embodiments, >95%, >90%, >85%, >80%, >75%, >70%, >65%, >60%, >55% or >50% of X's of the structure of formula (II) are chemically-modified nucleotides. In other embodiments, >95%, >90%, >85%, >80%, >75%, >70%, >65%, >60%, >55% or >50% of X's of the structure of formula (II) are chemically-modified nucleotides.
Structure of Formula (VI)
In an embodiment, the compound of formula (I) has the structure of formula (VI):
wherein X, for each occurrence, independently, is a nucleotide comprising a 2′-deoxy-2′-fluoro modification; X, for each occurrence, independently, is a nucleotide comprising a 2′-O-methyl modification; Y, for each occurrence, independently, is a nucleotide comprising a 2′-deoxy-2′-fluoro modification; and Y, for each occurrence, independently, is a nucleotide comprising a 2′-O-methyl modification.
In certain embodiments, X is chosen from the group consisting of 2′-deoxy-2′-fluoro modified adenosine, guanosine, uridine or cytidine. In an embodiment, X is chosen from the group consisting of 2′-O-methyl modified adenosine, guanosine, uridine or cytidine. In an embodiment, Y is chosen from the group consisting of 2′-deoxy-2′-fluoro modified adenosine, guanosine, uridine or cytidine. In an embodiment, Y is chosen from the group consisting of 2′-O-methyl modified adenosine, guanosine, uridine or cytidine.
In certain embodiments, the structure of formula (VI) does not contain mismatches. In one embodiment, the structure of formula (VI) contains 1 mismatch. In another embodiment, the compound of formula (VI) contains 2 mismatches. In another embodiment, the compound of formula (VI) contains 3 mismatches. In another embodiment, the compound of formula (VI) contains 4 mismatches.
Structure of Formula (VII)
In an embodiment, the compound of formula (I) has the structure of formula (VII) (SEQ ID NOS 3 and 4, respectively, in order of appearance):
wherein A is an adenosine comprising a 2′-deoxy-2′-fluoro modification; A is an adenosine comprising a 2′-O-methyl modification; G is an guanosine comprising a 2′-deoxy-2′-fluoro modification; G is an guanosine comprising a 2′-O-methyl modification; U is an uridine comprising a 2′-deoxy-2′-fluoro modification; U is an uridine comprising a 2′-O-methyl modification; C is an cytidine comprising a 2′-deoxy-2′-fluoro modification; C is an cytidine comprising a 2′-O-methyl modification; Y, for each occurrence, independently, is a nucleotide comprising a 2′-deoxy-2′-fluoro modification; and Y, for each occurrence, independently, is a nucleotide comprising a 2′-O-methyl modification.
Variable Linkers
In an embodiment of the compound of formula (I), L has the structure of L1:
In an embodiment of L1, R is R3 and n is 2.
In an embodiment of the structure of formula (II), L has the structure of L1. In an embodiment of the structure of formula (III), L has the structure of L1. In an embodiment of the structure of formula (IV), L has the structure of L1. In an embodiment of the structure of formula (V), L has the structure of L1. In an embodiment of the structure of formula (VI), L has the structure of L1. In an embodiment of the structure of formula (VII), L has the structure of L1.
In an embodiment of the compound of formula (I), L has the structure of L2:
In an embodiment of L2, R is R3 and n is 2.
In an embodiment of the structure of formula (II), L has the structure of L2. In an embodiment of the structure of formula (III), L has the structure of L2. In an embodiment of the structure of formula (IV), L has the structure of L2. In an embodiment of the structure of formula (V), L has the structure of L2. In an embodiment of the structure of formula (VI), L has the structure of L2. In an embodiment of the structure of formula (VII), L has the structure of L2.
Delivery System
In a third aspect, provided herein is a delivery system for therapeutic nucleic acids having the structure of formula (VIII):
L-(cNA)n (VIII)
wherein L is selected from an ethylene glycol chain, an alkyl chain, a peptide, RNA, DNA, a phosphate, a phosphonate, a phosphoramidate, an ester, an amide, a triazole, and combinations thereof, wherein formula (VIII) optionally further comprises one or more branch point B, and one or more spacer S; wherein B is independently for each occurrence a polyvalent organic species or derivative thereof; S is independently for each occurrence selected from an ethylene glycol chain, an alkyl chain, a peptide, RNA, DNA, a phosphate, a phosphonate, a phosphoramidate, an ester, an amide, a triazole, and combinations thereof; each cNA, independently, is a carrier nucleic acid comprising one or more chemical modifications; and n is 2, 3, 4, 5, 6, 7 or 8.
In one embodiment of the delivery system, L is an ethylene glycol chain. In another embodiment of the delivery system, L is an alkyl chain. In another embodiment of the delivery system, L is a peptide. In another embodiment of the delivery system, L is RNA. In another embodiment of the delivery system, L is DNA. In another embodiment of the delivery system, L is a phosphate. In another embodiment of the delivery system, L is a phosphonate. In another embodiment of the delivery system, L is a phosphoramidate. In another embodiment of the delivery system, L is an ester. In another embodiment of the delivery system, L is an amide. In another embodiment of the delivery system, L is a triazole.
In one embodiment of the delivery system, S is an ethylene glycol chain. In another embodiment, S is an alkyl chain. In another embodiment of the delivery system, S is a peptide. In another embodiment, S is RNA. In another embodiment of the delivery system, S is DNA. In another embodiment of the delivery system, S is a phosphate. In another embodiment of the delivery system, S is a phosphonate. In another embodiment of the delivery system, S is a phosphoramidate. In another embodiment of the delivery system, S is an ester. In another embodiment, S is an amide. In another embodiment, S is a triazole.
In one embodiment of the delivery system, n is 2. In another embodiment of the delivery system, n is 3. In another embodiment of the delivery system, n is 4. In another embodiment of the delivery system, n is 5. In another embodiment of the delivery system, n is 6. In another embodiment of the delivery system, n is 7. In another embodiment of the delivery system, n is 8.
In certain embodiments, each cNA comprises >95%, >90%, >85%, >80%, >75%, >70%, >65%, >60%, >55% or >50% chemically-modified nucleotides.
In an embodiment, the compound of formula (VIII) has a structure selected from formulas (VIII-1)-(VIII-9) of Table 3:
In an embodiment, the compound of formula (VIII) is the structure of formula (VIII-1). In an embodiment, the compound of formula (VIII) is the structure of formula (VIII-2). In an embodiment, the compound of formula (VIII) is the structure of formula (VIII-3). In an embodiment, the compound of formula (VIII) is the structure of formula (VIII-4). In an embodiment, the compound of formula (VIII) is the structure of formula (VIII-5). In an embodiment, the compound of formula (VIII) is the structure of formula (VIII-6). In an embodiment, the compound of formula (VIII) is the structure of formula (VIII-7). In an embodiment, the compound of formula (VIII) is the structure of formula (VIII-8). In an embodiment, the compound of formula (VIII) is the structure of formula (VIII-9).
In an embodiment, the compound of formulas (VIII) (including, e.g., formulas (VIII-1)-(VIII-9), each cNA independently comprises at least 15 contiguous nucleotides. In an embodiment, each cNA independently consists of chemically-modified nucleotides.
In an embodiment, the delivery system further comprises n therapeutic nucleic acids (NA), wherein each NA is hybridized to at least one cNA. In one embodiment, the delivery system is comprised of 2 NAs. In another embodiment, the delivery system is comprised of 3 NAs. In another embodiment, the delivery system is comprised of 4 NAs. In another embodiment, the delivery system is comprised of 5 NAs. In another embodiment, the delivery system is comprised of 6 NAs. In another embodiment, the delivery system is comprised of 7 NAs. In another embodiment, the delivery system is comprised of 8 NAs.
In an embodiment, each NA independently comprises at least 16 contiguous nucleotides. In an embodiment, each NA independently comprises 16-20 contiguous nucleotides. In an embodiment, each NA independently comprises 16 contiguous nucleotides. In another embodiment, each NA independently comprises 17 contiguous nucleotides. In another embodiment, each NA independently comprises 18 contiguous nucleotides. In another embodiment, each NA independently comprises 19 contiguous nucleotides. In another embodiment, each NA independently comprises 20 contiguous nucleotides.
In an embodiment, each NA comprises an unpaired overhang of at least 2 nucleotides. In another embodiment, each NA comprises an unpaired overhang of at least 3 nucleotides. In another embodiment, each NA comprises an unpaired overhang of at least 4 nucleotides. In another embodiment, each NA comprises an unpaired overhang of at least 5 nucleotides. In another embodiment, each NA comprises an unpaired overhang of at least 6 nucleotides. In an embodiment, the nucleotides of the overhang are connected via phosphorothioate linkages.
In an embodiment, each NA, independently, is selected from the group consisting of: DNA, siRNAs, antagomiRs, miRNAs, gapmers, mixmers, or guide RNAs. In one embodiment, each NA, independently, is a DNA. In another embodiment, each NA, independently, is a siRNA. In another embodiment, each NA, independently, is an antagomiR. In another embodiment, each NA, independently, is a miRNA. In another embodiment, each NA, independently, is a gapmer. In another embodiment, each NA, independently, is a mixmer. In another embodiment, each NA, independently, is a guide RNA. In an embodiment, each NA is the same. In an embodiment, each NA is not the same.
In an embodiment, the delivery system further comprising n therapeutic nucleic acids (NA) has a structure selected from formulas (I), (II), (III), (IV), (V), (VI), (VII), and embodiments thereof described herein. In one embodiment, the delivery system has a structure selected from formulas (I), (II), (III), (IV), (V), (VI), (VII), and embodiments thereof described herein further comprising 2 therapeutic nucleic acids (NA). In another embodiment, the delivery system has a structure selected from formulas (I), (II), (III), (IV), (V), (VI), (VII), and embodiments thereof described herein further comprising 3 therapeutic nucleic acids (NA). In one embodiment, the delivery system has a structure selected from formulas (I), (II), (III), (IV), (V), (VI), (VII), and embodiments thereof described herein further comprising 4 therapeutic nucleic acids (NA). In one embodiment, the delivery system has a structure selected from formulas (I), (II), (III), (IV), (V), (VI), (VII), and embodiments thereof described herein further comprising 5 therapeutic nucleic acids (NA). In one embodiment, the delivery system has a structure selected from formulas (I), (II), (III), (IV), (V), (VI), (VII), and embodiments thereof described herein further comprising 6 therapeutic nucleic acids (NA). In one embodiment, the delivery system has a structure selected from formulas (I), (II), (III), (IV), (V), (VI), (VII), and embodiments thereof described herein further comprising 7 therapeutic nucleic acids (NA). In one embodiment, the delivery system has a structure selected from formulas (I), (II), (III), (IV), (V), (VI), (VII), and embodiments thereof described herein further comprising 8 therapeutic nucleic acids (NA).
In one embodiment, the delivery system has a structure selected from formulas (I), (II), (III), (IV), (V), (VI), (VII) further comprising a linker of structure L1 or L2 wherein R is R3 and n is 2. In another embodiment, the delivery system has a structure selected from formulas (I), (II), (III), (IV), (V), (VI), (VII) further comprising a linker of structure L1 wherein R is R3 and n is 2. In another embodiment, the delivery system has a structure selected from formulas (I), (II), (III), (IV), (V), (VI), (VII) further comprising a linker of structure L2 wherein R is R3 and n is 2.
In an embodiment of the delivery system, the target of delivery is selected from the group consisting of: brain, liver, skin, kidney, spleen, pancreas, colon, fat, lung, muscle, and thymus. In one embodiment, the target of delivery is the brain. In another embodiment, the target of delivery is the striatum of the brain. In another embodiment, the target of delivery is the cortex of the brain. In another embodiment, the target of delivery is the striatum of the brain. In one embodiment, the target of delivery is the liver. In one embodiment, the target of delivery is the skin. In one embodiment, the target of delivery is the kidney. In one embodiment, the target of delivery is the spleen. In one embodiment, the target of delivery is the pancreas. In one embodiment, the target of delivery is the colon. In one embodiment, the target of delivery is the fat. In one embodiment, the target of delivery is the lung. In one embodiment, the target of delivery is the muscle. In one embodiment, the target of delivery is the thymus. In one embodiment, the target of delivery is the spinal cord.
It is to be understood that the methods described in this disclosure are not limited to particular methods and experimental conditions disclosed herein; as such methods and conditions may vary. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to be limiting.
Furthermore, the experiments described herein, unless otherwise indicated, use conventional molecular and cellular biological and immunological techniques within the skill of the art. Such techniques are well known to the skilled worker, and are explained fully in the literature. See, e.g., Ausubel, et al., ed., Current Protocols in Molecular Biology, John Wiley & Sons, Inc., NY (1987-2008), including all supplements, Molecular Cloning: A Laboratory Manual (Fourth Edition) by MR Green and J. Sambrook and Harlow et al., Antibodies: A Laboratory Manual, Chapter 14, Cold Spring Harbor Laboratory, Cold Spring Harbor (2013, 2nd edition).
Unless otherwise defined herein, scientific and technical terms used herein have the meanings that are commonly understood by those of ordinary skill in the art. In the event of any latent ambiguity, definitions provided herein take precedent over any dictionary or extrinsic definition. Unless otherwise required by context, singular terms shall include pluralities and plural terms shall include the singular. The use of “or” means “and/or” unless stated otherwise. The use of the term “including,” as well as other forms, such as “includes” and “included,” is not limiting.
As used herein, the term “nucleic acids” refers to RNA or DNA molecules consisting of a chain of ribonucleotides or deoxyribonucleotides, respectively.
As used herein, the term “therapeutic nucleic acid” refers to a nucleic acid molecule (e.g., ribonucleic acid) that has partial or complete complementarity to, and interacts with, a disease-associated target mRNA and mediates silencing of expression of the mRNA.
As used herein, the term “carrier nucleic acid” refers to a nucleic acid molecule (e.g., ribonucleic acid) that has sequence complementarity with, and hybridizes with, a therapeutic nucleic acid.
As used herein, the term “3′ end” refers to the end of the nucleic acid that contains an unmodified hydroxyl group at the 3′ carbon of the ribose ring.
As used herein, the term “5′ end” refers to the end of the nucleic acid that contains a phosphate group attached to the 5′ carbon of the ribose ring.
As used herein, the term “nucleoside” refers to a molecule made up of a heterocyclic base and its sugar.
As used herein, the term “nucleotide” refers to a nucleoside having a phosphate group on its 3′ or 5′ sugar hydroxyl group.
As used herein, the term “siRNA” refers to small interfering RNA duplexes that induce the RNA interference (RNAi) pathway. siRNA molecules can vary in length (generally between 18-30 basepairs) and contain varying degrees of complementarity to their target mRNA. The term “siRNA” includes duplexes of two separate strands, as well as single strands that can form hairpin structures comprising a duplex region.
As used herein, the term “antisense strand” refers to the strand of the siRNA duplex that contains some degree of complementarity to the target gene.
As used herein, the term “sense strand” refers to the strand of the siRNA duplex that contains complementarity to the antisense strand.
As used herein, the terms “chemically modified nucleotide” or “nucleotide analog” or “altered nucleotide” or “modified nucleotide” refer to a non-standard nucleotide, including non-naturally occurring ribonucleotides or deoxyribonucleotides. Exemplary nucleotide analogs are modified at any position so as to alter certain chemical properties of the nucleotide yet retain the ability of the nucleotide analog to perform its intended function. Examples of positions of the nucleotide which may be derivatized include the 5 position, e.g., 5-(2-amino)propyl uridine, 5-bromo uridine, 5-propyne uridine, 5-propenyl uridine, etc.; the 6 position, e.g., 6-(2-amino)propyl uridine; the 8-position for adenosine and/or guanosines, e.g., 8-bromo guanosine, 8-chloro guanosine, 8-fluoroguanosine, etc. Nucleotide analogs also include deaza nucleotides, e.g., 7-deaza-adenosine; O- and N-modified (e.g., alkylated, e.g., N6-methyl adenosine, or as otherwise known in the art) nucleotides; and other heterocyclically modified nucleotide analogs such as those described in Herdewijn, Antisense Nucleic Acid Drug Dev., 2000 Aug. 10(4):297-310.
Nucleotide analogs may also comprise modifications to the sugar portion of the nucleotides. For example the 2′ OH-group may be replaced by a group selected from H, OR, R, F, Cl, Br, I, SH, SR, NH2, NHR, NR2, COOR, or OR, wherein R is substituted or unsubstituted C1-C6 alkyl, alkenyl, alkynyl, aryl, etc. Other possible modifications include those described in U.S. Pat. Nos. 5,858,988, and 6,291,438.
As used herein, the term “metabolically stabilized” refers to RNA molecules that contain ribonucleotides that have been chemically modified from 2′-hydroxyl groups to 2′-O-methyl groups.
As used herein, the term “phosphorothioate” refers to the phosphate group of a nucleotide that is modified by substituting one or more of the oxygens of the phosphate group with sulfur.
As used herein, the term “ethylene glycol chain” refers to a carbon chain with the formula ((CH2OH)2).
As used herein, the term “alkyl chain” refers to an acyclic unsaturated hydrocarbon chain. In connection with this invention an “alkyl chain” includes but is not limited to straight chain, branch chain, and cyclic unsaturated hydrocarbon groups.
As used herein, the term “amide” refers to an alkyl or aromatic group that is attached to an amino-carbonyl functional group.
As used herein, the term “internucleoside” and “internucleotide” refer to the bonds between nucleosides and nucleotides, respectively.
As used herein, the term “triazol” refers to heterocyclic compounds with the formula (C2H3N3), having a five-membered ring of two carbons and three nitrogens, the positions of which can change resulting in multiple isomers.
As used herein, the term “terminal group” refers to the group at which a carbon chain or nucleic acid ends.
As used herein, the term “lipophilic amino acid” refers to an amino acid comprising a hydrophobic moiety (e.g., an alkyl chain or an aromatic ring).
As used herein, the term “antagomiRs” refers to nucleic acids that can function as inhibitors of miRNA activity.
As used herein, the term “gapmers” refers to chimeric antisense nucleic acids that contain a central block of deoxynucleotide monomers sufficiently long to induce RNase H cleavage. The deoxynucleotide block is flanked by ribonucleotide monomers or ribonucleotide monomers containing modifications.
As used herein, the term “mixmers” refers to nucleic acids that are comprised of a mix of locked nucleic acids (LNAs) and DNA.
As used herein, the term “guide RNAs” refers to refers to nucleic acids that have sequence complementarity to a specific sequence in the genome immediately or 1 base pair upstream of the protospacer adjacent motif (PAM) sequence as used in CRISPR/Cas9 gene editing systems.
As used herein, the term “target of delivery” refers to the organ or part of the body that is desired to deliver the branched oligonucleotide compositions to.
As used herein, the term “Di-siRNA” refers to a molecule of the present invention that comprises a branched oligonucleotide structure and contains siRNA molecules as the therapeutic nucleic acids.
As used herein, an “amino acid” refers to a molecule containing amine and carboxyl functional groups and a side chain (R) specific to the amino acid. In one embodiment, an amino acid has a structure of the formula:
In another embodiment, “amino acid” may refer to a component residue of a peptide or protein having a structure of the formula:
In some embodiments the amino acid is chosen from the group of proteinogenic amino acids. In other embodiments, the amino acid is an L-amino acid or a D-amino acid. In other embodiments, the amino acid is a synthetic amino acid (e.g., a beta-amino acid).
It is understood that certain internucleotide linkages provided herein, including, e.g., phosphodiester and phosphorothioate, comprise a formal charge of −1 at physiological pH, and that said formal charge will be balanced by a cationic moiety, e.g., an alkali metal such as sodium or potassium, an alkali earth metal such as calcium or magnesium, or an ammonium or guanidinium ion.
The phosphate group of the nucleotide may also be modified, e.g., by substituting one or more of the oxygens of the phosphate group with sulfur (e.g., phosphorothioates), or by making other substitutions which allow the nucleotide to perform its intended function such as described in, for example, Eckstein, Antisense Nucleic Acid Drug Dev. 2000 Apr. 10(2):117-21, Rusckowski et al. Antisense Nucleic Acid Drug Dev. 2000 Oct. 10(5):333-45, Stein, Antisense Nucleic Acid Drug Dev. 2001 Oct. 11(5): 317-25, Vorobjev et al. Antisense Nucleic Acid Drug Dev. 2001 Apr. 11(2):77-85, and U.S. Pat. No. 5,684,143. Certain of the above-referenced modifications (e.g., phosphate group modifications) preferably decrease the rate of hydrolysis of, for example, polynucleotides comprising said analogs in vivo or in vitro.
Delivery and Distribution
In another aspect, provided herein is a method for selectively delivering a nucleic acid as described herein to a particular organ in a patient, comprising administering to the patient a branched oligonucleotide as described herein, such that the nucleic acid is delivered selectively. In one embodiment, the organ is the liver. In another embodiment, the organ is the kidneys. In another embodiment, the organ is the spleen. In another embodiment, the organ is the heart. In another embodiment, the organ is the brain. In another embodiment, the nucleic acid
The compositions described herein promote simple, efficient, non-toxic delivery of metabolically stable oligonucleotides (e.g., siRNA), and promote potent silencing of therapeutic targets in a range of tissues in vivo.
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Di-siRNA shows a very unique cellular distribution when injected intrastriatally into the brain. Fluorescently labeled Di-siRNA appears to localize preferentially with neurons in the cortex. This selective feature is specific to these compounds and is not true for other siRNA conjugates such as cholesterol which show no cell type preference.
Di-siRNA shows localization to fiber tracts in the striatum but is present within neuronal cell bodies in the cortex. Movement to the cortex may be through diffusion or may be the result of retrograde transport via striatal fiber tracts. The theory that retrograde transport is partially responsible is supported by the fact that some areas of the cortex show full neuronal penetration while neurons in adjacent areas show no Di-siRNA association.
A single therapeutically relevant brain injection of Di-siRNA results in widespread distribution of Di-siRNA throughout the brain. The level of distribution demonstrated in
Di-siRNA shows widespread distribution throughout the body following a single intravenous injection. As shown in
Silencing
In some embodiments, compounds of the invention promote about 90% striatal silencing and about 65% cortical silencing in vivo in brain with a single injection, with no indication of toxicity. In some embodiments, compounds of the invention exhibit about 60% silencing throughout all regions of the spinal cord with intrathecal injection.
Single injection of Di-siRNA induces robust silencing in both the striatum and cortex of mouse brain. This level of efficacy has never been demonstrated previously for non-conjugated siRNAs. Although Di-siRNA appears visually associated with fiber tracts in striatum, the efficacy observed clearly indicates that striatal neurons are internalizing Di-siRNA to a significant degree. In experiments, intrastriatal injection 2 nmols Di-siRNA (4 nmols of corresponding antisense HTT strand). Animals sacrificed 7 days post-injection. Tissue punches taken from the 300 μm brain slices from the striatum and cortex. Di-siRNA antisense strands present in different brain regions, liver, and kidney were quantified using Cy3-labeled complimentary PNA to hybridize to the strand and HPLC to quantify ng of oligo per mg of tissue. aCSF—Artificial CSF.
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Modified RNA Silencing Agents
In certain aspects of the invention, an RNA silencing agent (or any portion thereof) of the invention as described supra may be modified such that the activity of the agent is further improved. For example, the RNA silencing agents described in above may be modified with any of the modifications described infra. The modifications can, in part, serve to further enhance target discrimination, to enhance stability of the agent (e.g., to prevent degradation), to promote cellular uptake, to enhance the target efficiency, to improve efficacy in binding (e.g., to the targets), to improve patient tolerance to the agent, and/or to reduce toxicity.
1) Modifications to Enhance Target Discrimination
In certain embodiments, the RNA silencing agents of the invention may be substituted with a destabilizing nucleotide to enhance single nucleotide target discrimination (see U.S. application Ser. No. 11/698,689, filed Jan. 25, 2007 and U.S. Provisional Application No. 60/762,225 filed Jan. 25, 2006, both of which are incorporated herein by reference). Such a modification may be sufficient to abolish the specificity of the RNA silencing agent for a non-target mRNA (e.g. wild-type mRNA), without appreciably affecting the specificity of the RNA silencing agent for a target mRNA (e.g. gain-of-function mutant mRNA).
In preferred embodiments, the RNA silencing agents of the invention are modified by the introduction of at least one universal nucleotide in the antisense strand thereof. Universal nucleotides comprise base portions that are capable of base pairing indiscriminately with any of the four conventional nucleotide bases (e.g. A, G, C, U). A universal nucleotide is preferred because it has relatively minor effect on the stability of the RNA duplex or the duplex formed by the guide strand of the RNA silencing agent and the target mRNA. Exemplary universal nucleotide include those having an inosine base portion or an inosine analog base portion selected from the group consisting of deoxyinosine (e.g. 2′-deoxyinosine), 7-deaza-2′-deoxyinosine, 2′-aza-2′-deoxyinosine, PNA-inosine, morpholino-inosine, LNA-inosine, phosphoramidate-inosine, 2′-O-methoxyethyl-inosine, and 2′-OMe-inosine. In particularly preferred embodiments, the universal nucleotide is an inosine residue or a naturally occurring analog thereof.
In certain embodiments, the RNA silencing agents of the invention are modified by the introduction of at least one destabilizing nucleotide within 5 nucleotides from a specificity-determining nucleotide (i.e., the nucleotide which recognizes the disease-related polymorphism). For example, the destabilizing nucleotide may be introduced at a position that is within 5, 4, 3, 2, or 1 nucleotide(s) from a specificity-determining nucleotide. In exemplary embodiments, the destabilizing nucleotide is introduced at a position which is 3 nucleotides from the specificity-determining nucleotide (i.e., such that there are 2 stabilizing nucleotides between the destablilizing nucleotide and the specificity-determining nucleotide). In RNA silencing agents having two strands or strand portions (e.g. siRNAs and shRNAs), the destabilizing nucleotide may be introduced in the strand or strand portion that does not contain the specificity-determining nucleotide. In preferred embodiments, the destabilizing nucleotide is introduced in the same strand or strand portion that contains the specificity-determining nucleotide.
2) Modifications to Enhance Efficacy and Specificity
In certain embodiments, the RNA silencing agents of the invention may be altered to facilitate enhanced efficacy and specificity in mediating RNAi according to asymmetry design rules (see U.S. Pat. Nos. 8,309,704, 7,750,144, 8,304,530, 8,329,892 and 8,309,705). Such alterations facilitate entry of the antisense strand of the siRNA (e.g., a siRNA designed using the methods of the invention or an siRNA produced from a shRNA) into RISC in favor of the sense strand, such that the antisense strand preferentially guides cleavage or translational repression of a target mRNA, and thus increasing or improving the efficiency of target cleavage and silencing. Preferably the asymmetry of an RNA silencing agent is enhanced by lessening the base pair strength between the antisense strand 5′ end (AS 5′) and the sense strand 3′ end (S 3′) of the RNA silencing agent relative to the bond strength or base pair strength between the antisense strand 3′ end (AS 3′) and the sense strand 5′ end (S ‘5) of said RNA silencing agent.
In one embodiment, the asymmetry of an RNA silencing agent of the invention may be enhanced such that there are fewer G:C base pairs between the 5’ end of the first or antisense strand and the 3′ end of the sense strand portion than between the 3′ end of the first or antisense strand and the 5′ end of the sense strand portion. In another embodiment, the asymmetry of an RNA silencing agent of the invention may be enhanced such that there is at least one mismatched base pair between the 5′ end of the first or antisense strand and the 3′ end of the sense strand portion. Preferably, the mismatched base pair is selected from the group consisting of G:A, C:A, C:U, G:G, A:A, C:C and U:U. In another embodiment, the asymmetry of an RNA silencing agent of the invention may be enhanced such that there is at least one wobble base pair, e.g., G:U, between the 5′ end of the first or antisense strand and the 3′ end of the sense strand portion. In another embodiment, the asymmetry of an RNA silencing agent of the invention may be enhanced such that there is at least one base pair comprising a rare nucleotide, e.g., inosine (I). Preferably, the base pair is selected from the group consisting of an I:A, I:U and I:C. In yet another embodiment, the asymmetry of an RNA silencing agent of the invention may be enhanced such that there is at least one base pair comprising a modified nucleotide. In preferred embodiments, the modified nucleotide is selected from the group consisting of 2-amino-G, 2-amino-A, 2,6-diamino-G, and 2,6-diamino-A.
3) RNA Silencing Agents with Enhanced Stability
The RNA silencing agents of the present invention can be modified to improve stability in serum or in growth medium for cell cultures. In order to enhance the stability, the 3′-residues may be stabilized against degradation, e.g., they may be selected such that they consist of purine nucleotides, particularly adenosine or guanosine nucleotides. Alternatively, substitution of pyrimidine nucleotides by modified analogues, e.g., substitution of uridine by 2′-deoxythymidine is tolerated and does not affect the efficiency of RNA interference.
In a preferred aspect, the invention features RNA silencing agents that include first and second strands wherein the second strand and/or first strand is modified by the substitution of internal nucleotides with modified nucleotides, such that in vivo stability is enhanced as compared to a corresponding unmodified RNA silencing agent. As defined herein, an “internal” nucleotide is one occurring at any position other than the 5′ end or 3′ end of nucleic acid molecule, polynucleotide or oligonucleotide. An internal nucleotide can be within a single-stranded molecule or within a strand of a duplex or double-stranded molecule. In one embodiment, the sense strand and/or antisense strand is modified by the substitution of at least one internal nucleotide. In another embodiment, the sense strand and/or antisense strand is modified by the substitution of at least 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25 or more internal nucleotides. In another embodiment, the sense strand and/or antisense strand is modified by the substitution of at least 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95% or more of the internal nucleotides. In yet another embodiment, the sense strand and/or antisense strand is modified by the substitution of all of the internal nucleotides.
In a preferred embodiment of the present invention, the RNA silencing agents may contain at least one modified nucleotide analogue. The nucleotide analogues may be located at positions where the target-specific silencing activity, e.g., the RNAi mediating activity or translational repression activity is not substantially effected, e.g., in a region at the 5′-end and/or the 3′-end of the siRNA molecule. Particularly, the ends may be stabilized by incorporating modified nucleotide analogues.
Exemplary nucleotide analogues include sugar- and/or backbone-modified ribonucleotides (i.e., include modifications to the phosphate-sugar backbone). For example, the phosphodiester linkages of natural RNA may be modified to include at least one of a nitrogen or sulfur heteroatom. In exemplary backbone-modified ribonucleotides, the phosphoester group connecting to adjacent ribonucleotides is replaced by a modified group, e.g., of phosphothioate group. In exemplary sugar-modified ribonucleotides, the 2′ OH-group is replaced by a group selected from H, OR, R, halo, SH, SR, NH2, NHR, NR2 or ON, wherein R is C1-C6 alkyl, alkenyl or alkynyl and halo is F, Cl, Br or I.
In particular embodiments, the modifications are 2′-fluoro, 2′-amino and/or 2′-thio modifications. Particularly preferred modifications include 2′-fluoro-cytidine, 2′-fluoro-uridine, 2′-fluoro-adenosine, 2′-fluoro-guanosine, 2′-amino-cytidine, 2′-amino-uridine, 2′-amino-adenosine, 2′-amino-guanosine, 2,6-diaminopurine, 4-thio-uridine, and/or 5-amino-allyl-uridine. In a particular embodiment, the 2′-fluoro ribonucleotides are every uridine and cytidine. Additional exemplary modifications include 5-bromo-uridine, 5-iodo-uridine, 5-methyl-cytidine, ribo-thymidine, 2-aminopurine, 2′-amino-butyryl-pyrene-uridine, 5-fluoro-cytidine, and 5-fluoro-uridine. 2′-deoxy-nucleotides and 2′-Ome nucleotides can also be used within modified RNA-silencing agents moieties of the instant invention. Additional modified residues include, deoxy-abasic, inosine, N3-methyl-uridine, N6,N6-dimethyl-adenosine, pseudouridine, purine ribonucleoside and ribavirin. In a particularly preferred embodiment, the 2′ moiety is a methyl group such that the linking moiety is a 2′-O-methyl oligonucleotide.
In an exemplary embodiment, the RNA silencing agent of the invention comprises Locked Nucleic Acids (LNAs). LNAs comprise sugar-modified nucleotides that resist nuclease activities (are highly stable) and possess single nucleotide discrimination for mRNA (Elmen et al., Nucleic Acids Res., (2005), 33(1): 439-447; Braasch et al. (2003) Biochemistry 42:7967-7975, Petersen et al. (2003) Trends Biotechnol 21:74-81). These molecules have 2′-0,4′-C-ethylene-bridged nucleic acids, with possible modifications such as 2′-deoxy-2″-fluorouridine. Moreover, LNAs increase the specificity of oligonucleotides by constraining the sugar moiety into the 3′-endo conformation, thereby pre-organizing the nucleotide for base pairing and increasing the melting temperature of the oligonucleotide by as much as 10° C. per base.
In another exemplary embodiment, the RNA silencing agent of the invention comprises Peptide Nucleic Acids (PNAs). PNAs comprise modified nucleotides in which the sugar-phosphate portion of the nucleotide is replaced with a neutral 2-amino ethylglycine moiety capable of forming a polyamide backbone which is highly resistant to nuclease digestion and imparts improved binding specificity to the molecule (Nielsen, et al., Science, (2001), 254: 1497-1500).
Also preferred are nucleobase-modified ribonucleotides, i.e., ribonucleotides, containing at least one non-naturally occurring nucleobase instead of a naturally occurring nucleobase. Bases may be modified to block the activity of adenosine deaminase. Exemplary modified nucleobases include, but are not limited to, uridine and/or cytidine modified at the 5-position, e.g., 5-(2-amino)propyl uridine, 5-bromo uridine; adenosine and/or guanosines modified at the 8 position, e.g., 8-bromo guanosine; deaza nucleotides, e.g., 7-deaza-adenosine; O- and N-alkylated nucleotides, e.g., N6-methyl adenosine are suitable. It should be noted that the above modifications may be combined.
In other embodiments, cross-linking can be employed to alter the pharmacokinetics of the RNA silencing agent, for example, to increase half-life in the body. Thus, the invention includes RNA silencing agents having two complementary strands of nucleic acid, wherein the two strands are crosslinked. The invention also includes RNA silencing agents which are conjugated or unconjugated (e.g., at its 3′ terminus) to another moiety (e.g. a non-nucleic acid moiety such as a peptide), an organic compound (e.g., a dye), or the like). Modifying siRNA derivatives in this way may improve cellular uptake or enhance cellular targeting activities of the resulting siRNA derivative as compared to the corresponding siRNA, are useful for tracing the siRNA derivative in the cell, or improve the stability of the siRNA derivative compared to the corresponding siRNA.
Other exemplary modifications include: (a) 2′ modification, e.g., provision of a 2′ OMe moiety on a U in a sense or antisense strand, but especially on a sense strand, or provision of a 2′ OMe moiety in a 3′ overhang, e.g., at the 3′ terminus (3′ terminus means at the 3′ atom of the molecule or at the most 3′ moiety, e.g., the most 3′ P or 2′ position, as indicated by the context); (b) modification of the backbone, e.g., with the replacement of an 0 with an S, in the phosphate backbone, e.g., the provision of a phosphorothioate modification, on the U or the A or both, especially on an antisense strand; e.g., with the replacement of a P with an S; (c) replacement of the U with a C5 amino linker; (d) replacement of an A with a G (sequence changes are preferred to be located on the sense strand and not the antisense strand); and (d) modification at the 2′, 6′, 7′, or 8′ position. Exemplary embodiments are those in which one or more of these modifications are present on the sense but not the antisense strand, or embodiments where the antisense strand has fewer of such modifications. Yet other exemplary modifications include the use of a methylated P in a 3′ overhang, e.g., at the 3′ terminus; combination of a 2′ modification, e.g., provision of a 2′ 0 Me moiety and modification of the backbone, e.g., with the replacement of a P with an S, e.g., the provision of a phosphorothioate modification, or the use of a methylated P, in a 3′ overhang, e.g., at the 3′ terminus; modification with a 3′ alkyl; modification with an abasic pyrrolidone in a 3′ overhang, e.g., at the 3′ terminus; modification with naproxen, ibuprofen, or other moieties which inhibit degradation at the 3′ terminus.
4) Modifications to Enhance Cellular Uptake
In other embodiments, a compound of the invention may be modified with chemical moieties, for example, to enhance cellular uptake by target cells (e.g., neuronal cells). Thus, the invention includes RNA silencing agents which are conjugated or unconjugated (e.g., at its 3′ terminus) to another moiety (e.g. a non-nucleic acid moiety such as a peptide), an organic compound (e.g., a dye), or the like. The conjugation can be accomplished by methods known in the art, e.g., using the methods of Lambert et al., Drug Deliv. Rev.: 47(1), 99-112 (2001) (describes nucleic acids loaded to polyalkylcyanoacrylate (PACA) nanoparticles); Fattal et al., J. Control Release 53(1-3):137-43 (1998) (describes nucleic acids bound to nanoparticles); Schwab et al., Ann. Oncol. 5 Suppl. 4:55-8 (1994) (describes nucleic acids linked to intercalating agents, hydrophobic groups, polycations or PACA nanoparticles); and Godard et al., Eur. J. Biochem. 232(2):404-10 (1995) (describes nucleic acids linked to nanoparticles).
In a particular embodiment, a compound of the invention is conjugated to a lipophilic moiety. In one embodiment, the lipophilic moiety is a ligand that includes a cationic group. In another embodiment, the lipophilic moiety is attached to one or both strands of an siRNA. In an exemplary embodiment, the lipophilic moiety is attached to one end of the sense strand of the siRNA. In another exemplary embodiment, the lipophilic moiety is attached to the 3′ end of the sense strand. In certain embodiments, the lipophilic moiety is selected from the group consisting of cholesterol, vitamin D, DHA, DHAg2, EPA, vitamin E, vitamin K, vitamin A, folic acid, or a cationic dye (e.g., Cy3).
5) Tethered Ligands
Other entities can be tethered to a compound of the invention. For example, a ligand tethered to an RNA silencing agent to improve stability, hybridization thermodynamics with a target nucleic acid, targeting to a particular tissue or cell-type, or cell permeability, e.g., by an endocytosis-dependent or -independent mechanism. Ligands and associated modifications can also increase sequence specificity and consequently decrease off-site targeting. A tethered ligand can include one or more modified bases or sugars that can function as intercalators. These are preferably located in an internal region, such as in a bulge of RNA silencing agent/target duplex. The intercalator can be an aromatic, e.g., a polycyclic aromatic or heterocyclic aromatic compound. A polycyclic intercalator can have stacking capabilities, and can include systems with 2, 3, or 4 fused rings. The universal bases described herein can be included on a ligand. In one embodiment, the ligand can include a cleaving group that contributes to target gene inhibition by cleavage of the target nucleic acid. The cleaving group can be, for example, a bleomycin (e.g., bleomycin-A5, bleomycin-A2, or bleomycin-B2), pyrene, phenanthroline (e.g., 0-phenanthroline), a polyamine, a tripeptide (e.g., lys-tyr-lys tripeptide), or metal ion chelating group. The metal ion chelating group can include, e.g., an Lu(III) or EU(III) macrocyclic complex, a Zn(II) 2,9-dimethylphenanthroline derivative, a Cu(II) terpyridine, or acridine, which can promote the selective cleavage of target RNA at the site of the bulge by free metal ions, such as Lu(III). In some embodiments, a peptide ligand can be tethered to a RNA silencing agent to promote cleavage of the target RNA, e.g., at the bulge region. For example, 1,8-dimethyl-1,3,6,8,10,13-hexaazacyclotetradecane (cyclam) can be conjugated to a peptide (e.g., by an amino acid derivative) to promote target RNA cleavage. A tethered ligand can be an aminoglycoside ligand, which can cause an RNA silencing agent to have improved hybridization properties or improved sequence specificity. Exemplary aminoglycosides include glycosylated polylysine, galactosylated polylysine, neomycin B, tobramycin, kanamycin A, and acridine conjugates of aminoglycosides, such as Neo-N-acridine, Neo-S-acridine, Neo-C-acridine, Tobra-N-acridine, and KanaA-N-acridine. Use of an acridine analog can increase sequence specificity. For example, neomycin B has a high affinity for RNA as compared to DNA, but low sequence-specificity. An acridine analog, neo-5-acridine has an increased affinity for the HIV Rev-response element (RRE). In some embodiments the guanidine analog (the guanidinoglycoside) of an aminoglycoside ligand is tethered to an RNA silencing agent. In a guanidinoglycoside, the amine group on the amino acid is exchanged for a guanidine group. Attachment of a guanidine analog can enhance cell permeability of an RNA silencing agent. A tethered ligand can be a poly-arginine peptide, peptoid or peptidomimetic, which can enhance the cellular uptake of an oligonucleotide agent.
Exemplary ligands are coupled, preferably covalently, either directly or indirectly via an intervening tether, to a ligand-conjugated carrier. In exemplary embodiments, the ligand is attached to the carrier via an intervening tether. In exemplary embodiments, a ligand alters the distribution, targeting or lifetime of an RNA silencing agent into which it is incorporated. In exemplary embodiments, a ligand provides an enhanced affinity for a selected target, e.g., molecule, cell or cell type, compartment, e.g., a cellular or organ compartment, tissue, organ or region of the body, as, e.g., compared to a species absent such a ligand.
Exemplary ligands can improve transport, hybridization, and specificity properties and may also improve nuclease resistance of the resultant natural or modified RNA silencing agent, or a polymeric molecule comprising any combination of monomers described herein and/or natural or modified ribonucleotides. Ligands in general can include therapeutic modifiers, e.g., for enhancing uptake; diagnostic compounds or reporter groups e.g., for monitoring distribution; cross-linking agents; nuclease-resistance conferring moieties; and natural or unusual nucleobases. General examples include lipophiles, lipids, steroids (e.g., uvaol, hecigenin, diosgenin), terpenes (e.g., triterpenes, e.g., sarsasapogenin, Friedelin, epifriedelanol derivatized lithocholic acid), vitamins (e.g., folic acid, vitamin A, biotin, pyridoxal), carbohydrates, proteins, protein binding agents, integrin targeting molecules, polycationics, peptides, polyamines, and peptide mimics. Ligands can include a naturally occurring substance, (e.g., human serum albumin (HSA), low-density lipoprotein (LDL), or globulin); carbohydrate (e.g., a dextran, pullulan, chitin, chitosan, inulin, cyclodextrin or hyaluronic acid); amino acid, or a lipid. The ligand may also be a recombinant or synthetic molecule, such as a synthetic polymer, e.g., a synthetic polyamino acid. Examples of polyamino acids include polyamino acid is a polylysine (PLL), poly L-aspartic acid, poly L-glutamic acid, styrene-maleic acid anhydride copolymer, poly(L-lactide-co-glycolied) copolymer, divinyl ether-maleic anhydride copolymer, N-(2-hydroxypropyl)methacrylamide copolymer (HMPA), polyethylene glycol (PEG), polyvinyl alcohol (PVA), polyurethane, poly(2-ethylacryllic acid), N-isopropylacrylamide polymers, or polyphosphazine. Example of polyamines include: polyethylenimine, polylysine (PLL), spermine, spermidine, polyamine, pseudopeptide-polyamine, peptidomimetic polyamine, dendrimer polyamine, arginine, amidine, protamine, cationic lipid, cationic porphyrin, quaternary salt of a polyamine, or an alpha helical peptide.
Ligands can also include targeting groups, e.g., a cell or tissue targeting agent, e.g., a lectin, glycoprotein, lipid or protein, e.g., an antibody, that binds to a specified cell type such as a kidney cell. A targeting group can be a thyrotropin, melanotropin, lectin, glycoprotein, surfactant protein A, mucin carbohydrate, multivalent lactose, multivalent galactose, N-acetyl-galactosamine, N-acetyl-glucosamine, multivalent mannose, multivalent fucose, glycosylated polyaminoacids, multivalent galactose, transferrin, bisphosphonate, polyglutamate, polyaspartate, a lipid, cholesterol, a steroid, bile acid, folate, vitamin B12, biotin, or an RGD peptide or RGD peptide mimetic. Other examples of ligands include dyes, intercalating agents (e.g. acridines and substituted acridines), cross-linkers (e.g. psoralene, mitomycin C), porphyrins (TPPC4, texaphyrin, Sapphyrin), polycyclic aromatic hydrocarbons (e.g., phenazine, dihydrophenazine, phenanthroline, pyrenes), lys-tyr-lys tripeptide, aminoglycosides, guanidium aminoglycodies, artificial endonucleases (e.g. EDTA), lipophilic molecules, e.g, cholesterol (and thio analogs thereof), cholic acid, cholanic acid, lithocholic acid, adamantane acetic acid, 1-pyrene butyric acid, dihydrotestosterone, glycerol (e.g., esters (e.g., mono, bis, or tris fatty acid esters, e.g., C10, C11, C12, C13, C14, C15, C16, C17, C18, C19, or C20 fatty acids) and ethers thereof, e.g., C10, C11, C12, C13, C14, C15, C16, C17, C18, C19, or C20 alkyl; e.g., 1,3-bis-O(hexadecyl)glycerol, 1,3-bis-O(octaadecyl)glycerol), geranyloxyhexyl group, hexadecylglycerol, borneol, menthol, 1,3-propanediol, heptadecyl group, palmitic acid, stearic acid (e.g., glyceryl distearate), oleic acid, myristic acid, O3-(oleoyl)lithocholic acid, O3-(oleoyl)cholenic acid, dimethoxytrityl, or phenoxazine) and peptide conjugates (e.g., antennapedia peptide, Tat peptide), alkylating agents, phosphate, amino, mercapto, PEG (e.g., PEG-40K), MPEG, [MPEG]2, polyamino, alkyl, substituted alkyl, radiolabeled markers, enzymes, haptens (e.g. biotin), transport/absorption facilitators (e.g., aspirin, naproxen, vitamin E, folic acid), synthetic ribonucleases (e.g., imidazole, bisimidazole, histamine, imidazole clusters, acridine-imidazole conjugates, Eu3+ complexes of tetraazamacrocycles), dinitrophenyl, HRP or AP.
Ligands can be proteins, e.g., glycoproteins, or peptides, e.g., molecules having a specific affinity for a co-ligand, or antibodies e.g., an antibody, that binds to a specified cell type such as a cancer cell, endothelial cell, or bone cell. Ligands may also include hormones and hormone receptors. They can also include non-peptidic species, such as lipids, lectins, carbohydrates, vitamins, cofactors, multivalent lactose, multivalent galactose, N-acetyl-galactosamine, N-acetyl-glucosamine multivalent mannose, or multivalent fucose. The ligand can be, for example, a lipopolysaccharide, an activator of p38 MAP kinase, or an activator of NF-κB.
The ligand can be a substance, e.g., a drug, which can increase the uptake of the RNA silencing agent into the cell, for example, by disrupting the cell's cytoskeleton, e.g., by disrupting the cell's microtubules, microfilaments, and/or intermediate filaments. The drug can be, for example, taxon, vincristine, vinblastine, cytochalasin, nocodazole, japlakinolide, latrunculin A, phalloidin, swinholide A, indanocine, or myoservin. The ligand can increase the uptake of the RNA silencing agent into the cell by activating an inflammatory response, for example. Exemplary ligands that would have such an effect include tumor necrosis factor alpha (TNFα), interleukin-1 beta, or gamma interferon. In one aspect, the ligand is a lipid or lipid-based molecule. Such a lipid or lipid-based molecule preferably binds a serum protein, e.g., human serum albumin (HSA). An HSA binding ligand allows for distribution of the conjugate to a target tissue, e.g., a non-kidney target tissue of the body. For example, the target tissue can be the liver, including parenchymal cells of the liver. Other molecules that can bind HSA can also be used as ligands. For example, neproxin or aspirin can be used. A lipid or lipid-based ligand can (a) increase resistance to degradation of the conjugate, (b) increase targeting or transport into a target cell or cell membrane, and/or (c) can be used to adjust binding to a serum protein, e.g., HSA. A lipid based ligand can be used to modulate, e.g., control the binding of the conjugate to a target tissue. For example, a lipid or lipid-based ligand that binds to HSA more strongly will be less likely to be targeted to the kidney and therefore less likely to be cleared from the body. A lipid or lipid-based ligand that binds to HSA less strongly can be used to target the conjugate to the kidney. In a preferred embodiment, the lipid based ligand binds HSA. A lipid-based ligand can bind HSA with a sufficient affinity such that the conjugate will be preferably distributed to a non-kidney tissue. However, it is preferred that the affinity not be so strong that the HSA-ligand binding cannot be reversed. In another preferred embodiment, the lipid based ligand binds HSA weakly or not at all, such that the conjugate will be preferably distributed to the kidney. Other moieties that target to kidney cells can also be used in place of or in addition to the lipid based ligand.
In another aspect, the ligand is a moiety, e.g., a vitamin, which is taken up by a target cell, e.g., a proliferating cell. These are particularly useful for treating disorders characterized by unwanted cell proliferation, e.g., of the malignant or non-malignant type, e.g., cancer cells. Exemplary vitamins include vitamin A, E, and K. Other exemplary vitamins include are B vitamin, e.g., folic acid, B12, riboflavin, biotin, pyridoxal or other vitamins or nutrients taken up by cancer cells. Also included are HSA and low density lipoprotein (LDL).
In another aspect, the ligand is a cell-permeation agent, preferably a helical cell-permeation agent. Preferably, the agent is amphipathic. An exemplary agent is a peptide such as tat or antennopedia. If the agent is a peptide, it can be modified, including a peptidylmimetic, invertomers, non-peptide or pseudo-peptide linkages, and use of D-amino acids. The helical agent is preferably an alpha-helical agent, which preferably has a lipophilic and a lipophobic phase.
The ligand can be a peptide or peptidomimetic. A peptidomimetic (also referred to herein as an oligopeptidomimetic) is a molecule capable of folding into a defined three-dimensional structure similar to a natural peptide. The attachment of peptide and peptidomimetics to oligonucleotide agents can affect pharmacokinetic distribution of the RNA silencing agent, such as by enhancing cellular recognition and absorption. The peptide or peptidomimetic moiety can be about 5-50 amino acids long, e.g., about 5, 10, 15, 20, 25, 30, 35, 40, 45, or 50 amino acids long. A peptide or peptidomimetic can be, for example, a cell permeation peptide, cationic peptide, amphipathic peptide, or hydrophobic peptide (e.g., consisting primarily of Tyr, Trp or Phe). The peptide moiety can be a dendrimer peptide, constrained peptide or crosslinked peptide. The peptide moiety can be an L-peptide or D-peptide. In another alternative, the peptide moiety can include a hydrophobic membrane translocation sequence (MTS). A peptide or peptidomimetic can be encoded by a random sequence of DNA, such as a peptide identified from a phage-display library, or one-bead-one-compound (OBOC) combinatorial library (Lam et al., Nature 354:82-84, 1991). In exemplary embodiments, the peptide or peptidomimetic tethered to an RNA silencing agent via an incorporated monomer unit is a cell targeting peptide such as an arginine-glycine-aspartic acid (RGD)-peptide, or RGD mimic. A peptide moiety can range in length from about 5 amino acids to about 40 amino acids. The peptide moieties can have a structural modification, such as to increase stability or direct conformational properties. Any of the structural modifications described below can be utilized
Chemical Synthesis of Di-siRNAs and Vitamin D Conjugated hsiRNAs
The Di-siRNAs used in the in vitro and in vivo efficacy evaluation were synthesized as follows. As shown in
Alternative Synthesis Route 1
As shown in
Alternative Synthesis Route 2
In order to produce a di-phosphate containing moiety, a second alternative synthesis approach was developed. As shown in
Quality Control of Chemical Synthesis of Di-siRNAs and Vitamin D Conjugated hsiRNAs.
HPLC
To assess the quality of the chemical synthesis of Di-siRNAs and Vitamin D conjugated hsiRNAs, analytical HPLC was used to identify and quantify the synthesized products. Three major products were identified: the siRNA sense strand capped with a tryethylene glycol (TEG) linker, the Di-siRNA, and the vitamin D conjugated siRNA sense strand (
Mass Spectrometry
Further quality control was done by mass spectrometry, which confirmed the identity of the Di-siRNA complex. The product was observed to have a mass of 11683 m/z, which corresponds to two sense strands of the siRNA attached at the 3′ ends through the TEG linker (
Efficacy and Cellular Uptake of By-products of Chemical Synthesis of Di-siRNAs and Vitamin D Conjugated hsiRNAs.
To assess the Htt gene silencing efficacy of each HPLC-isolated by-product of the chemical synthesis of Di-siRNAs and Vitamin D conjugated hsiRNAs, HeLa cells were treated with each isolated product by lipid-mediated transfection. Huntingtin mRNA expression was assessed through Affymetrix Quantigene 2.0 and normalized to a housekeeping gene (PPIB). All four by-products resulted in significant Htt gene silencing 72 hours post transfection (
In Vitro Efficacy of Di-Branched siRNA Structure.
To determine the in vitro efficacy of Di-branched siRNAs (Di-siRNAs), Di-siRNAs targeting Htt were transfected into HeLa cells using a lipid-mediated delivery system. HeLa cells were transfected with branched oligonucleotides at varying concentrations using RNAiMax. HTT mRNA expression was measured 72 hours after transfection. The Di-siRNAs caused significant silencing of the HTT gene, similar to the effect resulting from single siRNA duplex in HeLa cells (
To determine efficiency of cellular uptake and gene silencing in primary cortical neurons without lipid mediated delivery, cells were treated passively with Htt-Di-siRNAs at varying concentrations for one week. HTT mRNA expression was measured and normalized to the housekeeping gene PPIB. As shown in
Route of Administration of Di-siRNAs and Vitamin D Conjugated hsiRNAs
To assess the efficacy of delivery and activity of branched oligonucleotides in vivo in neurons, Di-HTT-Cy3 was delivered to mice via intrastriatal (IS) injection. Di-HTT-Cy3 localized to and accumulated throughout the injected hemisphere of the brain, whereas the single branch HTT-siRNA (tryethylene glycol conjugated siRNA (TEG-siRNA)) showed significantly lower accumulation in the injected hemisphere of the brain (
Alternative Route of Administration 1
To assess the efficacy of delivery and activity of branched oligonucleotides in the spinal cord, Di-HTT-Cy3 was delivered to mice via intrathecal (IT) injection in the lumbar region of the spinal cord. As shown in
Alternative Route of Administration 2
To assess the efficacy of delivery and activity of branched oligonucleotides throughout the brain in a clinically relevant experiment, Di-HTT-Cy3 was delivered to mice via intracerebroventricular (ICV) injection. The Di-siRNAs accumulated throughout the brain at both two days and two weeks post injection (
This result is important for the therapeutic potential of branched oligonucleotides, as ICV injection is a therapeutically relevant injection for neurological diseases. The efficacy and stability of the branched oligonucleotides following ICV administration demonstrates that the invention described herein could be utilized as therapy in a variety of hard to treat neurological diseases, including Huntington's disease.
Alternative Route of Administration 3
To assess the efficacy of delivery and activity of Di-siRNAs throughout the body, Di-HTT-Cy3 was administered to mice via intravenous (IV) injection. The mice were injected with 20 mg/kg Di-HTT-Cy3 and two consecutive days (total of 40 mg/kg) and were sacrificed 24 hours after the final injection. As shown in
Determination of Toxicity and Gliosis.
Toxicity
In order to assess the level of toxicity in the brain following injection of Di-HTT-Cy3, protein levels of DARPP32 were assessed in brain tissue because elevated DARPP32 indicates neuronal death (Jin, H., et al. DARPP-32 to quantify intracerebral hemorrhage-induced neuronal death in basal ganglia. Transl Stroke Res. 4(1): 130-134. 2013). Mice were treated with 2 nmols Di-HTT-Cy3 (4 nmols of corresponding antisense HTT strand) via IS or ICV injection. The animals were sacrificed 14 days after injection and tissue punches were taken from 300 μm brain slices from different areas of the brain. DARPP32 protein was quantified by immunoblot. Artificial cerebrospinal fluid (aCSF) was used as a negative control. Neither IS nor ICV injection of high dose Di-HTT-Cy3 resulted in significant toxicity (
Gliosis
In order to assess the level of gliosis in the brain following injection of Di-HTT-Cy3, GFAP protein levels were assessed following high dose of Di-HTT-Cy3. Mice were treated with 2 nmols Di-HTT-Cy3 (4 nmols of corresponding antisense HTT strand) via IS or ICV injection. The animals were sacrificed 14 days after injection and tissue punches were taken from 300 μm brain slices from different areas of the brain. GFAP protein was quantified by immunoblot. Artificial cerebrospinal fluid (aCSF) was used as a negative control. Artificial cerebrospinal fluid (aCSF) was used as a negative control. Both IS and ICV injection of high dose Di-HTT-Cy3 resulted in significant gliosis (
Determination of Di-HTT-Cy3 Efficacy in vivo
Distribution and Accumulation
In order to determine the efficacy of distribution of branched oligonucleotides in vivo, mice were treated with Di-HTT-Cy3 via IS, ICV, intrathecal, or IV injections as described above in Examples 7-10. In all Examples, 2 nmols Di-HTT-Cy3 (4 nmols of corresponding antisense HTT strand) was injected and accumulation was quantified by using Cy3-labeled peptide nucleic acids (PNAs) to hybridize to the sense strand. HPLC analysis was then used to quantify ng of Di-HTT-Cy3 per mg of tissue. Artificial cerebrospinal fluid (aCSF) was used as a negative control.
In fluorescent imaging experiments, brain slices were stained with DAPI (blue) imaged using the Cy3 channel to detect accumulation of Di-HTT-Cy3 (red).
Silencing
In order to determine the efficacy of silencing of branched oligonucleotides in vivo, mice were treated with Di-HTT-Cy3 via IS, ICV, intrathecal, or IV injections as described above in Examples 7-10. In all examples, 2 nmols Di-HTT-Cy3 (4 nmols of corresponding antisense HTT strand) was injected and silencing of Htt mRNA was quantified using Affymetrix Quantigene 2.0 as described in Coles, A. et al., A High-Throughput Method for Direct Detection of Therapeutic Oligonucleotide Induced Gene Silencing In Vivo. Nucl Acid Ther. 26 (2), 86-92, 2015. Data was normalized to the housekeeping control, HPRT and artificial cerebrospinal fluid (aCSF) was used as a negative control.
Incorporation of a Hydrophobic Moiety in the Branched Oligonucleotide Structure: Strategy 1
In one example, a short hydrophobic alkylene or alkane (Hy) with an unprotected hydroxyl group (or amine) that can be phosphitylated with 2-Cyanoethoxy-bis(N,N-diisopropylamino)phosphine (or any other suitable phosphitylating reagent) is used to produce the corresponding lipophilic phosphoramidite. These lipophilic phosphoramidites can be added to the terminal position of the branched oligonucleotide using conventional oligonucleotide synthesis conditions. This strategy is depicted in
Incorporation of a Hydrophobic Moeity in the Branched Oligonucleotide Structure: Strategy 2
In another example, a short/small aromatic planar molecule (Hy) that has an unprotected hydroxyl group with or without a positive charge (or amine) that can be phosphitylated with 2-Cyanoethoxy-bis(N,N-diisopropylamino)phosphine (or any other suitable phosphitylating reagent) is used to produce the corresponding aromatic hydrophobic phosphoramidite. The aromatic moiety can have a positive charge. These lipophilic phosphoramidites can be added to the terminal position of the branched oligonucleotide using conventional oligonucleotide synthesis conditions. This strategy is depicted in
Incorporation of a Hydrophobic Moeity in the Branched Oligonucleotide Structure: Strategy 3
To introduce biologically relevant hydrophobic moieties, short lipophilic peptides are made by sequential peptide synthesis either on solid support or in solution (the latter being described here). The short (1-10) amino acid chain can contain positively charged or polar amino acid moieties as well, as any positive charge will reduce the overall net charge of the oligonucleotide, therefore increasing the hydrophobicity. Once the peptide of appropriate length is made it should be capped with acetic anhydride or another short aliphatic acid to increase hydrophobicity and mask the free amine. The carbonyl protecting group is then removed to allow for 3-aminopropan-1-ol to be coupled allowing a free hydroxyl (or amine) to be phosphitylated. This amino acid phosphoramidite can then be added to the terminal 5′ position of the branched oligonucleotide using conventional oligonucleotide synthesis conditions. This strategy is depicted in
This application is a continuation of U.S. patent application Ser. No. 16/390,712, filed Apr. 22, 2019, which is a division of U.S. patent application Ser. No. 15/419,593, filed Jan. 30, 2017, now U.S. Pat. No. 10,478,503, which claims priority to U.S. Provisional Patent Application Nos. 62/289,268, filed Jan. 31, 2016, and 62/317,113, filed Apr. 1, 2016. The contents of the aforementioned applications are incorporated by reference herein for all purposes.
This invention was made with government support under Grant No. GM108803 awarded by the National Institutes of Health. The Government has certain rights in the invention.
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