Patent Grant
9327137
The present invention relates to formulations for combating canine distemper virus and other canine virus infections in animals. Specifically, the present invention provides vectors that contain and express in vivo or in vitro CDV HA that elicit an immune response in animals against canine distemper virus, including compositions comprising said vectors, methods of vaccination against canine distemper virus, and kits for use with such methods and compositions. The present invention also provides vectors that contain and express in vivo or in vitro CDV HA and GM-CSF that elicit an immune response in animals against canine distemper virus and other canine virus, and compositions comprising said vectors.
Canine distemper (CD) is a highly infectious, febrile disease of dogs and other carnivores (Fenner, et al., 1987, Veterinary Virology, Academic Press, Inc., pp. 485-503). The mortality rate is high, ranging between 30 and 80 percent. Dogs survived often have permanent central nerve system damage (Fenner, et al., 1987). The established etiology of CD is infection by a member of the Paramyxovirus family, morbillivirus genus known as CD virus (CDV). In general, Paramyxoviruses are enveloped viruses containing an 18-20 kb single stranded RNA genome of negative polarity. The genome encodes 5 to 7 structural proteins including a fusion (F) and either a hemagglutinin-neuraminidase (HN) or hemagglutinin (HA) glycoprotein. The membrane glycoprotein hemagglutinin (HA) is responsible for hemagglutination and attachment of the virus to the host cell, and the fusion glycoprotein (F) causes membrane fusion between the virus and the infected cell or between the infected and adjacent uninfected cells (Graves et al., 1978, Virology 86:254-263). For CDV, both F and HA glycoproteins are found present in the viral envelope and on the surface of infected cells. By inference from analyses with other morbillivirus members, the CDV F and HA glycoproteins appear important for CDV infection and its immunobiology (Diallo A., 1990, Vet. Micro. 23: 155-163). Poxvirus based recombinant CDV vaccines have been developed to protect and treat dogs (U.S. Pat. No. 5,756,102). U.S. patent application Ser. No. 09/232,477 disclosed DNA plasmid based vaccines expressing CDV antigens.
Granulocyte-macrophage colony-stimulating factor (GM-CSF) was first discovered in 1977 (Burgess et al., 1977, J. Biol. Chem. 252:1998-2003). GM-CSF has many physiological roles. In particular, GM-CSF stimulates the production, the development and the formation of colonies of granulocyes, macrophages, eosinophils and megakaryocytes. (Dy M., in “les Cytokines” Cavailon 1995 ed. Masson, Paris, France, 43-56). GM-CSF induces in particular a macrophagic cytotoxocity, stimulates antibody-dependent cytotoxic activity (ADCC) and the recruitment of leukocytes at the level of the sites of inflammation.
The sizes of the nucleotide sequences encoding the known GM-CSFs from various species vary from 381 to 432 nucleotides. The human and murine nucleotide sequences have a degree of homology of 69%. The degree of homology is 54% at the level of the amino acid sequence (Cantrell et al., 1985, Proc. Natl. Acad. Sci. USA 82:6250-6254). An equine GM-CSF was identified which has a size of 144 amino acids (U.S. Pat. No. 7,250,161). Two canine GM-CSFs were identified in U.S. Pat. No. 5,702,919 and U.S. Pat. No. 5,606,024, which have 127 amino acids and 174 amino acids respectively.
The administration of heterologous GM-CSF does not make it possible to obtain an optimum adjuvant effect, in particular a stimulation of the activity of the haematopoietic cells and a substantial increase in the immune response.
There is thus a general need for an improvement in efficacy and safety of the CDV vaccines and for more effective protection in field conditions.
The invention provides a solution for optimizing the immunological effect of caGM-CSF while retaining high safety for the vaccinated dogs.
An object of this invention can be any one or all of providing recombinant vectors or viruses as well as methods for making such viruses, and providing compositions and/or vaccines as well as methods for treatment and prophylaxis of infection by CDV and other canine virus.
The invention provides a recombinant vector, such as a recombinant virus, that contains and expresses at least one exogenous nucleic acid molecule and, the at least one exogenous nucleic acid molecule may comprise a nucleic acid molecule encoding an immunogen or epitope of interest from CDV, such as CDV HA.
The invention provides a recombinant vector, such as a recombinant poxvirus that contains a first polynucleotide encoding a CDV HA polypeptide and/or variant or fragment thereof and a second polynucleotide encoding a canine GM-CSF polypeptide and/or variant or fragment thereof.
The invention further provides compositions or vaccines comprising such an expression vector or the expression product(s) of such an expression vector.
The invention further provides methods for inducing an immunological (or immunogenic) or protective response against CDV and other canine virus, as well as methods for preventing or treating CDV and other canine virus or disease state(s) caused by CDV and other canine virus, comprising administering the expression vector or an expression product of the expression vector, or a composition comprising the expression vector, or a composition comprising an expression product of the expression vector.
The invention also relates to expression products from the virus as well as antibodies generated from the expression products or the expression thereof in vivo and uses for such products and antibodies, e.g., in diagnostic applications.
These and other embodiments are disclosed or are obvious from and encompassed by, the following Detailed Description.
The following detailed description, given by way of example, but not intended to limit the invention solely to the specific embodiments described, may best be understood in conjunction with the accompanying drawings, in which:
Compositions comprising an expression vector comprising a polynucleotide encoding a CDV polypeptide and fragments and variants thereof that elicit an immunogenic response in an animal are provided. The expression vector comprising the polynucleotide encoding CDV polypeptide or fragments or variants may be formulated into vaccines or pharmaceutical compositions and used to elicit or stimulate a protective response in an animal. In one embodiment the CDV polypeptide is a CDV hemagglutinin (HA) polypeptide or active fragment or variant thereof.
Compositions comprising an expression vector comprising a polynucleotide encoding a CDV HA polypeptide or active fragments or variants thereof and a polynucleotide encoding a GM-CSF polypeptide or active fragments or variants thereof are provided.
It is recognized that the polypeptides of the invention may be full length polypeptides or active fragments or variants thereof. By “active fragments” or “active variants” is intended that the fragments or variants retain the antigenic nature of the polypeptide. Thus, the present invention encompasses any CDV polypeptide, antigen, epitope or immunogen that elicits an immunogenic response in an animal. The CDV polypeptide, antigen, epitope or immunogen may be any CDV polypeptide, antigen, epitope or immunogen, such as, but not limited to, a protein, peptide or fragment or variant thereof, that elicits, induces or stimulates a response in an animal.
A particular CDV polypeptide of interest is CDV hemagglutinin (HA). CDV HA refers to a type of hemagglutinin found on the surface of the CDV. It is an antigenic glycoprotein and is responsible for binding the virus to the cell that is being infected. There are different HA antigens, associated with the different CDV strains which circulate in the field, any of which can be used in the practice of the invention. However, there are different antigens, such as the Fusion (F) glycoprotein and Nucleoprotein (NP), any of which can be used in the practice of the invention. It is further recognized that precursors of any of these antigens can be used. The antigenic polypeptides of the invention are capable of protecting against CDV. That is, they are capable of stimulating an immune response in an animal.
The term “antigen” or “immunogen” means a substance that induces a specific immune response in a host animal. The antigen may comprise a whole organism, killed, attenuated or live; a subunit or portion of an organism; a recombinant vector containing an insert with immunogenic properties; a piece or fragment of DNA capable of inducing an immune response upon presentation to a host animal; a polypeptide, an epitope, a hapten, or any combination thereof. Alternately, the immunogen or antigen may comprise a toxin or antitoxin.
The terms “protein”, “peptide”, “polypeptide” and “polypeptide fragment” are used interchangeably herein to refer to polymers of amino acid residues of any length. The polymer can be linear or branched, it may comprise modified amino acids or amino acid analogs, and it may be interrupted by chemical moieties other than amino acids. The terms also encompass an amino acid polymer that has been modified naturally or by intervention; for example disulfide bond formation, glycosylation, lipidation, acetylation, phosphorylation, or any other manipulation or modification, such as conjugation with a labeling or bioactive component.
The term “CDV HA polypeptide or polynucleotide” refers to any native or optimized CDV HA polypeptide or polynucleotide, and their derivatives and variants.
The term “GM-CSF polypeptide or polynucleotide” refers to any native or optimized GM-CSF polypeptide or polynucleotide, and their derivatives and variants.
The term “immunogenic or antigenic polypeptide” as used herein includes polypeptides that are immunologically active in the sense that once administered to the host, it is able to evoke an immune response of the humoral and/or cellular type directed against the protein. Preferably the protein fragment is such that it has substantially the same immunological activity as the total protein. Thus, a protein fragment according to the invention comprises or consists essentially of or consists of at least one epitope or antigenic determinant. An “immunogenic” protein or polypeptide, as used herein, includes the full-length sequence of the protein, analogs thereof, or immunogenic fragments thereof. By “immunogenic fragment” is meant a fragment of a protein which includes one or more epitopes and thus elicits the immunological response described above. Such fragments can be identified using any number of epitope mapping techniques well known in the art. See, e.g., Epitope Mapping Protocols in Methods in Molecular Biology, Vol. 66 (Glenn E. Morris, Ed., 1996). For example, linear epitopes may be determined by e.g., concurrently synthesizing large numbers of peptides on solid supports, the peptides corresponding to portions of the protein molecule, and reacting the peptides with antibodies while the peptides are still attached to the supports. Such techniques are known in the art and described in, e.g., U.S. Pat. No. 4,708,871; Geysen et al., 1984; Geysen et al., 1986. Similarly, conformational epitopes are readily identified by determining spatial conformation of amino acids such as by, e.g., x-ray crystallography and 2-dimensional nuclear magnetic resonance. See, e.g., Epitope Mapping Protocols, supra.
As discussed herein, the invention encompasses active fragments and variants of the antigenic polypeptide. Thus, the term “immunogenic or antigenic polypeptide” further contemplates deletions, additions and substitutions to the sequence, so long as the polypeptide functions to produce an immunological response as defined herein.
The term “conservative variation” denotes the replacement of an amino acid residue by another biologically similar residue, or the replacement of a nucleotide in a nucleic acid sequence such that the encoded amino acid residue does not change or is another biologically similar residue. In this regard, particularly preferred substitutions will generally be conservative in nature, i.e., those substitutions that take place within a family of amino acids. For example, amino acids are generally divided into four families: (1) acidic—aspartate and glutamate; (2) basic—lysine, arginine, histidine; (3) non-polar—alanine, valine, leucine, isoleucine, proline, phenylalanine, methionine, tryptophan; and (4) uncharged polar—glycine, asparagine, glutamine, cystine, serine, threonine, tyrosine. Phenylalanine, tryptophan, and tyrosine are sometimes classified as aromatic amino acids. Examples of conservative variations include the substitution of one hydrophobic residue such as isoleucine, valine, leucine or methionine for another hydrophobic residue, or the substitution of one polar residue for another polar residue, such as the substitution of arginine for lysine, glutamic acid for aspartic acid, or glutamine for asparagine, and the like; or a similar conservative replacement of an amino acid with a structurally related amino acid that will not have a major effect on the biological activity. Proteins having substantially the same amino acid sequence as the reference molecule but possessing minor amino acid substitutions that do not substantially affect the immunogenicity of the protein are, therefore, within the definition of the reference polypeptide. All of the polypeptides produced by these modifications are included herein. The term “conservative variation” also includes the use of a substituted amino acid in place of an unsubstituted parent amino acid provided that antibodies raised to the substituted polypeptide also immunoreact with the unsubstituted polypeptide.
The term “epitope” refers to the site on an antigen or hapten to which specific B cells and/or T cells respond. The term is also used interchangeably with “antigenic determinant” or “antigenic determinant site”. Antibodies that recognize the same epitope can be identified in a simple immunoassay showing the ability of one antibody to block the binding of another antibody to a target antigen.
An “immunological response” to a composition or vaccine is the development in the host of a cellular and/or antibody-mediated immune response to a composition or vaccine of interest. Usually, an “immunological response” includes but is not limited to one or more of the following effects: the production of antibodies, B cells, helper T cells, and/or cytotoxic T cells, directed specifically to an antigen or antigens included in the composition or vaccine of interest. Preferably, the host will display either a therapeutic or protective immunological response such that resistance to new infection will be enhanced and/or the clinical severity of the disease reduced. Such protection will be demonstrated by either a reduction or lack of symptoms normally displayed by an infected host, a quicker recovery time and/or a lowered viral titer in the infected host.
By “animal” is intended mammals, birds, and the like. Animal or host as used herein includes mammals and human. The animal may be selected from the group consisting of equine (e.g., horse), canine (e.g., dogs, wolves, foxes, coyotes, jackals), feline (e.g., lions, tigers, domestic cats, wild cats, other big cats, and other felines including cheetahs and lynx), ovine (e.g., sheep), bovine (e.g., cattle), porcine (e.g., pig), avian (e.g., chicken, duck, goose, turkey, quail, pheasant, parrot, finches, hawk, crow, ostrich, emu and cassowary), primate (e.g., prosimian, tarsier, monkey, gibbon, ape), ferrets, seals, and fish. The term “animal” also includes an individual animal in all stages of development, including embryonic and fetal stages.
Unless otherwise explained, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The singular terms “a”, “an”, and “the” include plural referents unless context clearly indicates otherwise. Similarly, the word “or” is intended to include “and” unless the context clearly indicate otherwise.
It is noted that in this disclosure and particularly in the claims and/or paragraphs, terms such as “comprises”, “comprised”, “comprising” and the like can have the meaning attributed to it in U.S. Patent law; e.g., they can mean “includes”, “included”, “including”, and the like; and that terms such as “consisting essentially of” and “consists essentially of” have the meaning ascribed to them in U.S. Patent law, e.g., they allow for elements not explicitly recited, but exclude elements that are found in the prior art or that affect a basic or novel characteristic of the invention.
Compositions
The present invention relates to a CDV vaccine or composition which may comprise a recombinant or expression vector comprising a polynucleotide encoding a CDV polypeptide, antigen, epitope or immunogen and a pharmaceutically or veterinarily acceptable carrier, excipient, adjuvant, or vehicle. The CDV polypeptide, antigen, epitope or immunogen may be any CDV polypeptide, antigen, epitope or immunogen, such as, but not limited to, a protein, peptide or fragment thereof, that elicits, induces or stimulates a response in an animal.
The present invention relates to a CDV vaccine or composition which may comprise a recombinant or expression vector comprising a polynucleotide encoding a CDV HA polypeptide and a pharmaceutically or veterinarily acceptable carrier, excipient, adjuvant, or vehicle. In one embodiment, the expression vector may further comprise a polynucleotide encoding a GM-CSF polypeptide.
In another embodiment, the pharmaceutically or veterinarily acceptable carrier, excipient, adjuvant, or vehicle may be a water-in-oil emulsion. In yet another embodiment, the water-in-oil emulsion may be a water/oil/water (W/O/W) triple emulsion. In yet another embodiment, the pharmaceutically or veterinarily acceptable carrier, excipient, adjuvant, or vehicle may be an oil-in-water emulsion.
In an embodiment, the CDV polypeptide, antigen or fragment or variant thereof may be a CDV HA polypeptide or fragment or variant thereof. In an aspect of this embodiment, the CDV HA polypeptide or fragment or variant thereof is a recombinant polypeptide produced by a CDV HA gene. In another aspect of this embodiment, the CDV HA gene has at least 70% identity to the sequence as set forth in SEQ ID NO: 1, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, or 49. In another aspect of this embodiment, the CDV HA polypeptide or fragment or variant thereof has at least 80% identity to the sequence as set forth in SEQ ID NO: 2, 5, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, or 34.
In another embodiment, the GM-CSF polypeptide, antigen or fragment or variant is a recombinant polypeptide produced by a GM-CSF gene. In another aspect of this embodiment, the GM-CSF gene has at least 70% identity to the sequence as set forth in SEQ ID NO: 3. In another aspect of this embodiment, the GM-CSF polypeptide or fragment or variant thereof has at least 80% identity to the sequence as set forth in SEQ ID NO: 4.
Synthetic antigens are also included within the definition, for example, polyepitopes, flanking epitopes, and other recombinant or synthetically derived antigens. See, e.g., Bergmann et al., 1993; Bergmann et al., 1996; Suhrbier, 1997; Gardner et al., 1998. Immunogenic fragments, for purposes of the present invention, will usually include at least about 3 amino acids, at least about 5 amino acids, at least about 10-15 amino acids, or about 15-25 amino acids or more amino acids, of the molecule. There is no critical upper limit to the length of the fragment, which could comprise nearly the full-length of the protein sequence, or even a fusion protein comprising at least one epitope of the protein.
Accordingly, a minimum structure of a polynucleotide expressing an epitope is that it comprises or consists essentially of or consists of nucleotides encoding an epitope or antigenic determinant of a CDV polypeptide. A polynucleotide encoding a fragment of a CDV polypeptide may comprise or consist essentially of or consist of a minimum of 15 nucleotides, about 30-45 nucleotides, about 45-75, or at least 75, 87 or 150 consecutive or contiguous nucleotides of the sequence encoding the polypeptide. Epitope determination procedures, such as, generating overlapping peptide libraries (Hemmer et al., 1998), Pepscan (Geysen et al., 1984; Geysen et al., 1985; Van der Zee R. et al., 1989; Geysen, 1990; Multipin™ Peptide Synthesis Kits de Chiron) and algorithms (De Groot et al., 1999; PCT/US2004/022605) can be used in the practice of the invention.
The term “nucleic acid” and “polynucleotide” refers to RNA or DNA that is linear or branched, single or double stranded, or a hybrid thereof. The term also encompasses RNA/DNA hybrids. The following are non-limiting examples of polynucleotides: a gene or gene fragment, exons, introns, mRNA, tRNA, rRNA, ribozymes, cDNA, recombinant polynucleotides, branched polynucleotides, plasmids, vectors, isolated DNA of any sequence, isolated RNA of any sequence, nucleic acid probes and primers. A polynucleotide may comprise modified nucleotides, such as methylated nucleotides and nucleotide analogs, uracyl, other sugars and linking groups such as fluororibose and thiolate, and nucleotide branches. The sequence of nucleotides may be further modified after polymerization, such as by conjugation, with a labeling component. Other types of modifications included in this definition are caps, substitution of one or more of the naturally occurring nucleotides with an analog, and introduction of means for attaching the polynucleotide to proteins, metal ions, labeling components, other polynucleotides or solid support. The polynucleotides can be obtained by chemical synthesis or derived from a microorganism.
The term “gene” is used broadly to refer to any segment of polynucleotide associated with a biological function. Thus, genes include introns and exons as in genomic sequence, or just the coding sequences as in cDNAs and/or the regulatory sequences required for their expression. For example, gene also refers to a nucleic acid fragment that expresses mRNA or functional RNA, or encodes a specific protein, and which includes regulatory sequences.
The invention further comprises a complementary strand to a polynucleotide encoding a CDV antigen, epitope or immunogen or to a polynucleotide encoding a GM-CSF antigen, epitope or immunogen. The complementary strand can be polymeric and of any length, and can contain deoxyribonucleotides, ribonucleotides, and analogs in any combination.
An “isolated” biological component (such as a nucleic acid or protein or organelle) refers to a component that has been substantially separated or purified away from other biological components in the cell of the organism in which the component naturally occurs, for instance, other chromosomal and extra-chromosomal DNA and RNA, proteins, and organelles. Nucleic acids and proteins that have been “isolated” include nucleic acids and proteins purified by standard purification methods. The term also embraces nucleic acids and proteins prepared by recombinant technology as well as chemical synthesis.
The term “purified” as used herein does not require absolute purity; rather, it is intended as a relative term. Thus, for example, a partially purified polypeptide preparation is one in which the polypeptide is more enriched than the polypeptide is in its natural environment. That is the polypeptide is separated from cellular components. By “substantially purified” is intended that at least 60%, at least 70%, at least 80%, at least 90%, at least 95%, or at least 98%, or more of the cellular components or materials have been removed. Likewise, a polypeptide may be partially purified. By “partially purified” is intended that less than 60% of the cellular components or material is removed. The same applies to polynucleotides. The polypeptides disclosed herein can be purified by any of the means known in the art.
Moreover, homologs of CDV HA polypeptides and homologs of GM-CSF polypeptides are intended to be within the scope of the present invention. As used herein, the term “homologs” includes orthologs, analogs and paralogs. The term “anologs” refers to two polynucleotides or polypeptides that have the same or similar function, but that have evolved separately in unrelated organisms. The term “orthologs” refers to two polynucleotides or polypeptides from different species, but that have evolved from a common ancestral gene by speciation. Normally, orthologs encode polypeptides having the same or similar functions. The term “paralogs” refers to two polynucleotides or polypeptides that are related by duplication within a genome. Paralogs usually have different functions, but these functions may be related. For example, analogs, orthologs, and paralogs of a wild-type CDV polypeptide can differ from the wild-type CDV polypeptide by post-translational modifications, by amino acid sequence differences, or by both. In particular, homologs of the invention will generally exhibit at least 80-85%, 85-90%, 90-95%, or 95%, 96%, 97%, 98%, 99% sequence identity, with all or part of the wild-type CDV polypeptide or polynucleotide sequences, and will exhibit a similar function.
In one embodiment, the present invention provides an expression vector comprising one or more polynucleotides encoding one or more polypeptides having at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 95%, 96%, 97%, 98% or 99% sequence identity to a polypeptide having a sequence as set forth in SEQ ID NO: 2, 4, 5, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, or 34. In another embodiment, the present invention provides fragments and variants of the CDV polypeptides or GM-CSF identified above (SEQ ID NO: 2, 4, 5, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, or 34) which may readily be prepared by one of skill in the art using well-known molecular biology techniques. Variants are homologous polypeptides having amino acid sequences at least 75%, 80%, 85%, 90%, 95%, 96%, 97%, 98%, or 99% identity to the amino acid sequences as set forth in SEQ ID NO: 2, 4, 5, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, or 34.
Variants include allelic variants. The term “allelic variant” refers to a polynucleotide or a polypeptide containing polymorphisms that lead to changes in the amino acid sequences of a protein and that exist within a natural population (e.g., a virus species or variety). Such natural allelic variations can typically result in 1-5% variance in a polynucleotide or a polypeptide. Allelic variants can be identified by sequencing the nucleic acid sequence of interest in a number of different species, which can be readily carried out by using hybridization probes to identify the same gene genetic locus in those species. Any and all such nucleic acid variations and resulting amino acid polymorphisms or variations that are the result of natural allelic variation and that do not alter the functional activity of gene of interest, are intended to be within the scope of the invention.
As used herein, the term “derivative” or “variant” refers to a polypeptide, or a nucleic acid encoding a polypeptide, that has one or more conservative amino acid variations or other minor modifications such that (1) the corresponding polypeptide has substantially equivalent function when compared to the wild type polypeptide or (2) an antibody raised against the polypeptide is immunoreactive with the wild-type polypeptide. These variants or derivatives include polypeptides having minor modifications of the CDV polypeptide or GM-CSF primary amino acid sequences that may result in peptides which have substantially equivalent activity as compared to the unmodified counterpart polypeptide. Such modifications may be deliberate, as by site-directed mutagenesis, or may be spontaneous. The term “variant” further contemplates deletions, additions and substitutions to the sequence, so long as the polypeptide functions to produce an immunological response as defined herein.
An immunogenic fragment of a CDV polypeptide or GM-CSF polypeptide includes at least 8, 10, 13, 14, 15, or 20 consecutive amino acids, at least 21 amino acids, at least 23 amino acids, at least 25 amino acids, or at least 30 amino acids of a CDV HA polypeptide having a sequence as set forth in SEQ ID NO: 2, 5, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, or 34 or variants thereof, or of a GM-CSF polypeptide having a sequence as set forth in SEQ ID NO:4 or variants thereof.
In another aspect, the present invention provides an expression vector comprising a polynucleotide encoding a CDV HA polypeptide, such as a polynucleotide encoding a polypeptide having a sequence as set forth in SEQ ID NO: 2, 5, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, or 34. In yet another aspect, the present invention provides an expression vector comprising a polynucleotide encoding a polypeptide having at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 95%, 96%, 97%, 98% or 99% sequence identity to a polypeptide having a sequence as set forth in SEQ ID NO: 2, 5, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, or 34, or a conservative variant, an allelic variant, a homolog or an immunogenic fragment comprising at least eight or at east ten consecutive amino acids of one of these polypeptides, or a combination of these polypeptides.
In yet another aspect, the present invention provides an expression vector comprising a polynucleotide encoding a GM-CSF polypeptide, such as a polynucleotide encoding a polypeptide having a sequence as set forth in SEQ ID NO: 4. In yet another aspect, the present invention provides an expression vector comprising a polynucleotide encoding a polypeptide having at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 95%, 96%, 97%, 98% or 99% sequence identity to a polypeptide having a sequence as set forth in SEQ ID NO: 4, or a conservative variant, an allelic variant, a homolog or an immunogenic fragment comprising at least eight or at east ten consecutive amino acids of one of these polypeptides, or a combination of these polypeptides.
In one embodiment the polynucleotide of the present invention includes a polynucleotide having a nucleotide sequence as set forth in SEQ ID NO: 1, 3, 6, 7, 8, 9, 14, 19, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, or 49, or a variant thereof. In another embodiment, the polynucleotide of the present invention includes a polynucleotide having at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 95%, at least 95%, 96%, 97%, 98% or 99% sequence identity to one of a polynucleotide having a sequence as set forth in SEQ ID NO: 1, 3, 6, 7, 8, 9, 14, 19, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, or 49, or a variant thereof.
The polynucleotides of the disclosure include sequences that are degenerate as a result of the genetic code, e.g., optimized codon usage for a specific host. As used herein, “optimized” refers to a polynucleotide that is genetically engineered to increase its expression in a given species. To provide optimized polynucleotides coding for CDV HA polypeptides or GM-CSF polypeptides, the DNA sequence of the CDV HA gene or GM-CSF gene can be modified to 1) comprise codons preferred by highly expressed genes in a particular species; 2) comprise an A+T or G+C content in nucleotide base composition to that substantially found in said species; 3) form an initiation sequence of said species; or 4) eliminate sequences that cause destabilization, inappropriate polyadenylation, degradation and termination of RNA, or that form secondary structure hairpins or RNA splice sites. Increased expression of CDV HA protein or GM-CSF protein in said species can be achieved by utilizing the distribution frequency of codon usage in eukaryotes and prokaryotes, or in a particular species. The term “frequency of preferred codon usage” refers to the preference exhibited by a specific host cell in usage of nucleotide codons to specify a given amino acid. There are 20 natural amino acids, most of which are specified by more than one codon. Therefore, all degenerate nucleotide sequences are included in the disclosure as long as the amino acid sequence of the CDV HA polypeptide or the GM-CSF polypeptide encoded by the nucleotide sequence is functionally unchanged.
The sequence identity between two amino acid sequences may be established by the NCBI (National Center for Biotechnology Information) pairwise blast and the blosum62 matrix, using the standard parameters (see, e.g., the BLAST or BLASTX algorithm available on the “National Center for Biotechnology Information” (NCBI, Bethesda, Md., USA) server, as well as in Altschul et al.).
The “identity” with respect to sequences can refer to the number of positions with identical nucleotides or amino acids divided by the number of nucleotides or amino acids in the shorter of the two sequences wherein alignment of the two sequences can be determined in accordance with the Wilbur and Lipman algorithm (Wilbur and Lipman), for instance, using a window size of 20 nucleotides, a word length of 4 nucleotides, and a gap penalty of 4, and computer-assisted analysis and interpretation of the sequence data including alignment can be conveniently performed using commercially available programs (e.g., Intelligenetics™ Suite, Intelligenetics Inc. CA). When RNA sequences are said to be similar, or have a degree of sequence identity or homology with DNA sequences, thymidine (T) in the DNA sequence is considered equal to uracil (U) in the RNA sequence. Thus, RNA sequences are within the scope of the invention and can be derived from DNA sequences, by thymidine (T) in the DNA sequence being considered equal to uracil (U) in RNA sequences.
The sequence identity or sequence similarity of two amino acid sequences, or the sequence identity between two nucleotide sequences can be determined using Vector NTI software package (Invitrogen, 1600 Faraday Ave., Carlsbad, Calif.).
The following documents provide algorithms for comparing the relative identity or homology of sequences, and additionally or alternatively with respect to the foregoing, the teachings in these references can be used for determining percent homology or identity: Needleman S B and Wunsch C D; Smith T F and Waterman M S; Smith T F, Waterman M S and Sadler J R; Feng D F and Dolittle R F; Higgins D G and Sharp P M; Thompson J D, Higgins D G and Gibson T J; and, Devereux J, Haeberlie P and Smithies O. And, without undue experimentation, the skilled artisan can consult with many other programs or references for determining percent homology.
Hybridization reactions can be performed under conditions of different “stringency.” Conditions that increase stringency of a hybridization reaction are well known. See for example, “Molecular Cloning: A Laboratory Manual”, second edition (Sambrook et al., 1989).
The invention encompasses the CDV polynucleotide or GM-CSF polynucleotide or both contained in a vector molecule or an expression vector and operably linked to a promoter element and optionally to an enhancer.
The present invention further encompasses a canine vaccine or composition which may comprise an aforementioned recombinant vector comprising a polynucleotide encoding a CDV HA polypeptide or antigen and a polynucleotide encoding a GM-CSF polypeptide or antigen, a pharmaceutically or veterinarily acceptable carrier, excipient, adjuvant, or vehicle, and additionally one or more antigens from canine. The present invention further relates to a canine vaccine or composition which may comprise an aforementioned recombinant or expression vector comprising a polynucleotide encoding a GM-CSF polypeptide, a pharmaceutically or veterinarily acceptable carrier, excipient, adjuvant, or vehicle, and additionally one or more antigens from canine. The antigen may be canine antigen selected from the group consisting of rabies, canine parvovirus, canine coronavirus, canine influenza, canine distemper, infectious canine hepatitis, canine herpesvirus, pseudorabies, canine minute virus, Leptospira, Neospora caninum, Borrelia burgdorferi, Ehrlichia canis, Rickettsia rickettsii, Bordetella bronchiseptica, Blastomyces dermatitidis, Histoplasma capsulatum, Coccidioides immitis, Cryptococcus neoformans, Microsporum canis, Sporothrix schenckii, Aspergillus fumigatus, and P. insidiosum. The antigen may comprise a whole organism, killed, attenuated or live; a subunit or portion of an organism; a recombinant vector containing an insert with immunogenic properties; a piece or fragment of DNA capable of inducing an immune response upon presentation to a host animal; a polypeptide, an epitope, a hapten, or any combination thereof.
A “vector” refers to a recombinant DNA or RNA plasmid or virus that comprises a heterologous polynucleotide to be delivered to a target cell, either in vitro or in vivo. The heterologous polynucleotide may comprise a sequence of interest for purposes of prevention or therapy, and may optionally be in the form of an expression cassette. As used herein, a vector needs not be capable of replication in the ultimate target cell or subject. The term includes cloning vectors and viral vectors.
The term “recombinant” means a polynucleotide with semisynthetic or synthetic origin which either does not occur in nature or is linked to another polynucleotide in an arrangement not found in nature.
“Heterologous” means derived from a genetically distinct entity from the rest of the entity to which it is being compared. For example, a polynucleotide may be placed by genetic engineering techniques into a plasmid or vector derived from a different source, and is a heterologous polynucleotide. A promoter removed from its native coding sequence and operatively linked to a coding sequence other than the native sequence is a heterologous promoter.
The polynucleotides of the invention may comprise additional sequences, such as additional encoding sequences within the same transcription unit, controlling elements such as promoters, ribosome binding sites, 5′UTR, 3′UTR, transcription terminators, polyadenylation sites, additional transcription units under control of the same or a different promoter, sequences that permit cloning, expression, homologous recombination, and transformation of a host cell, and any such construct as may be desirable to provide embodiments of this invention.
Elements for the expression of a CDV HA polypeptide, antigen, epitope or immunogen or a GM-CSF polypeptide are present in an inventive vector. In minimum manner, this comprises an initiation codon (ATG), a stop codon and a promoter, and optionally also a polyadenylation sequence for certain vectors such as plasmid and certain viral vectors, e.g., viral vectors other than poxviruses. When the polynucleotide encodes a polypeptide fragment, e.g. a CDV HA polypeptide, in the vector, an ATG is placed at 5′ of the reading frame and a stop codon is placed at 3′. Other elements for controlling expression may be present, such as enhancer sequences, stabilizing sequences, such as intron and signal sequences permitting the secretion of the protein.
The present invention also relates to compositions or vaccines comprising vectors. The composition or vaccine can comprise one or more vectors, e.g., expression vectors, such as in vivo expression vectors, comprising and expressing one or more CDV HA or GM-CSF polypeptides, antigens, epitopes or immunogens. In one embodiment, the vector contains and expresses a polynucleotide that comprises a polynucleotide coding for and/or expressing a CDV HA antigen, epitope or immunogen, in a pharmaceutically or veterinarily acceptable carrier, excipient, adjuvant, or vehicle. Thus, according to an embodiment of the invention, the other vector or vectors in the preparation comprises, consists essentially of or consists of a polynucleotide that encodes, and under appropriate circumstances the vector expresses one or more other proteins of a CDV HA polypeptide, antigen, epitope or immunogen (e.g., hemagglutinin, neuraminidase, nucleoprotein) or a fragment thereof.
According to another embodiment, the vector or vectors in the composition or vaccine comprise, or consist essentially of, or consist of polynucleotide(s) encoding one or more proteins or fragment(s) of a CDV HA polypeptide, antigen, epitope or immunogen, or a GM-CSF polypeptide, antigen, epitope or immunogen, or a combination thereof. In another embodiment, the composition or vaccine comprises one, two, or more vectors comprising polynucleotides encoding and expressing, advantageously in vivo, a CDV HA polypeptide, antigen, fusion protein or an epitope thereof. The invention is also directed at mixtures of vectors that comprise polynucleotides encoding and expressing different CDV HA polypeptides, antigens, epitopes, fusion protein, or immunogens, e.g., a CDV HA polypeptide, antigen, epitope or immunogen from different species such as, but not limited to, humans, pigs, cows or cattle, dogs, cats, and avian.
In the present invention a recombinant viral vector is used to express a CDV coding sequence or fragments thereof encoding a CDV polypeptide or fragment or variant thereof. Specifically, the viral vector can express a CDV sequence, more specifically a CDV HA gene or fragment thereof that encodes an antigenic polypeptide. Viral vector contemplated herein includes, but not limited to, poxvirus [e.g., vaccinia virus or attenuated vaccinia virus, avipox virus or attenuated avipox virus (e.g., canarypox, fowlpox, dovepox, pigeonpox, quailpox, ALVAC, TROVAC; see e.g., U.S. Pat. No. 5,505,941, U.S. Pat. No. 5,494,8070), raccoonpox virus, swinepox virus, etc.], adenovirus (e.g., human adenovirus, canine adenovirus), herpesvirus (e.g. canine herpesvirus, feline herpesvirus, bovine herpesvirus, swine herpesvirus), baculovirus, retrovirus, etc. In another embodiment, the avipox expression vector may be a canarypox vector, such as, ALVAC. In yet another embodiment, the avipox expression vector may be a fowlpox vector, such as, TROVAC. The CDV polypeptide, antigen, epitope or immunogen may be a CDV HA. For example, the poxvirus vectors comprising the CDV HA may be vectors as described in U.S. Pat. No. 5,756,102. The CDV HA polypeptide or antigen of the invention to be expressed is inserted under the control of a specific poxvirus promoter, e.g., the vaccinia promoter 7.5 kDa (Cochran et al., 1985), the vaccinia promoter I3L (Riviere et al., 1992), the vaccinia promoter HA (Shida, 1986), the cowpox promoter ATI (Funahashi et al., 1988), the vaccinia promoter H6 (Taylor et al., 1988b; Guo et al., 1989; Perkus et al., 1989), inter alia.
According to a yet further embodiment of the invention, the expression vector is a plasmid vector, in particular an in vivo expression vector. In a specific, non-limiting example, the pVR1020 or 1012 plasmid (VICAL Inc.; Luke et al., 1997; Hartikka et al., 1996, see, e.g., U.S. Pat. Nos. 5,846,946 and 6,451,769) can be utilized as a vector for the insertion of a polynucleotide sequence. The pVR1020 plasmid is derived from pVR1012 and contains the human tPA signal sequence. In one embodiment the human tPA signal comprises from amino acid M(1) to amino acid S(23) of GenBank accession number HUMTPA14. In another specific, non-limiting example, the plasmid utilized as a vector for the insertion of a polynucleotide sequence can contain the signal peptide sequence of equine IGF1 from amino acid M(24) to amino acid A(48) of GenBank accession number U28070. Additional information on DNA plasmids which may be consulted or employed in the practice are found, for example, in U.S. Pat. Nos. 6,852,705; 6,818,628; 6,586,412; 6,576,243; 6,558,674; 6,464,984; 6,451,770; 6,376,473 and 6,221,362. The DNA plasmid based vaccines expressing CDV antigens may be found in U.S. patent application Ser. No. 09/587,964.
The term plasmid covers any DNA transcription unit comprising a polynucleotide according to the invention and the elements necessary for its in vivo expression in a cell or cells of the desired host or target; and, in this regard, it is noted that a supercoiled or non-supercoiled, circular plasmid, as well as a linear form, are intended to be within the scope of the invention.
Each plasmid comprises or contains or consists essentially of, in addition to the polynucleotide encoding a CDV HA polypeptide, antigen, epitope or immunogen, optionally fused with a heterologous peptide sequence, variant, analog or fragment, operably linked to a promoter or under the control of a promoter or dependent upon a promoter. In general, it is advantageous to employ a strong promoter functional in eukaryotic cells. The strong promoter may be, but not limited to, the immediate early cytomegalovirus promoter (CMV-IE) of human or murine origin, or optionally having another origin such as the rat or guinea pig.
In more general terms, the promoter has either a viral, or a cellular origin. A strong viral promoter other than CMV-IE that may be usefully employed in the practice of the invention is the early/late promoter of the SV40 virus or the LTR promoter of the Rous sarcoma virus. A strong cellular promoter that may be usefully employed in the practice of the invention is the promoter of a gene of the cytoskeleton, such as e.g. the desmin promoter (Kwissa et al., 2000), or the actin promoter (Miyazaki et al., 1989).
As to the polyadenylation signal (polyA) for the plasmids and viral vectors other than poxviruses, use can be made of the poly(A) signal of the bovine growth hormone (bGH) gene (see U.S. Pat. No. 5,122,458), or the poly(A) signal of the rabbit (3-globin gene or the poly(A) signal of the SV40 virus.
A “host cell” denotes a prokaryotic or eukaryotic cell that has been genetically altered, or is capable of being genetically altered by administration of an exogenous polynucleotide, such as a recombinant plasmid or vector. When referring to genetically altered cells, the term refers both to the originally altered cell and to the progeny thereof.
Methods of Use and Article of Manufacture
The present invention includes the following method embodiments. In an embodiment, a method of vaccinating an animal comprising administering composition comprising a vector comprising a polynucleotide encoding a CDV HA polypeptide or fragment or variant thereof and a pharmaceutical or veterinarily acceptable carrier, excipient, vehicle, or adjuvant to an animal is disclosed. In one aspect of this embodiment, the animal is an avian, an equine, a canine, a feline, a ferret, a seal, or a porcine.
In another embodiment, a method of vaccinating an animal comprising a composition comprising a vector comprising a polynucleotide encoding a CDV HA polypeptide and a polynucleotide encoding a GM-CSF polypeptide and a pharmaceutical or veterinarily acceptable carrier, excipient, vehicle, or adjuvant and one or more compositions comprising canine antigens is disclosed.
In yet another embodiment, a method of vaccinating an animal comprising a composition comprising a vector comprising a polynucleotide encoding a GM-CSF polypeptide and a pharmaceutical or veterinarily acceptable carrier, excipient, vehicle, or adjuvant and one or more compositions comprising canine antigens is disclosed.
In one embodiment of the invention, a prime-boost regime can be employed, which is comprised of at least one primary administration and at least one booster administration using at least one common polypeptide, antigen, epitope or immunogen. The administration may comprise one, two, or more vaccines or compositions comprising same or different antigens. Typically the immunological composition(s) or vaccine(s) used in primary administration is different in nature from those used as a booster. However, it is noted that the same composition(s) can be used as the primary administration and the booster administration. This administration protocol is called “prime-boost”.
A prime-boost regimen comprises at least one prime-administration and at least one boost administration using at least one common polypeptide and/or variants or fragments thereof. The prime-administration may comprise one or more administrations. Similarly, the boost administration may comprise one or more administrations. The prime-administration may comprise one or more antigens and the boost administration may comprise one or more antigens.
In one aspect of the prime-boost protocol or regime of the invention, a prime-boost protocol may comprise the administration of a composition comprising a recombinant viral vector that contains and expresses a CDV HA polypeptide, antigen and/or variants or fragments thereof in vivo followed by the administration of a recombinant CDV HA polypeptide or antigen, or an inactivated viral composition or vaccine comprising the CDV HA polypeptide or antigen, or a DNA plasmid-based composition or vaccine expressing the CDV HA polypeptide or antigen. Likewise, a prime-boost protocol may comprise the administration of a composition comprising a recombinant CDV HA antigen, or an inactivated viral composition or vaccine comprising the CDV HA polypeptide or antigen, or a DNA plasmid-based composition or vaccine expressing the CDV HA polypeptide or antigen followed by the administration of a recombinant viral vector that contains and expresses a CDV HA polypeptide or antigen and/or variants or fragments thereof in vivo. It is further noted that both the primary and the secondary administrations may comprise the recombinant viral vector that contains and expresses a CDV HA polypeptide of the invention. Thus, the recombinant CDV viral vector of the invention may be administered in any order with a recombinant CDV antigen, an inactivated viral composition or vaccine comprising the CDV antigen, or a DNA plasmid-based composition or vaccine expressing the CDV antigen, or alternatively may be used alone as both the primary and secondary compositions.
The dose volume of compositions for target species that are mammals, e.g., the dose volume of dog compositions, based on viral vectors, e.g., non-poxvirus-viral-vector-based compositions, is generally between about 0.1 to about 2.0 ml, between about 0.1 to about 1.0 ml, and between about 0.5 ml to about 1.0 ml.
The efficacy of the vaccines may be tested about 2 to 4 weeks after the last immunization by challenging animals, such as dog, with a virulent strain of CDV. Both homologous and heterologous strains are used for challenge to test the efficacy of the vaccine. The animal may be challenged orally, by IV injection or by IC inoculation. For each different challenge strain and each route of administration used, the virus is at a sufficiently high titre to induce clinical symptoms in unvaccinated animals. The volume of challenge virus is about 0.5 to 2.0 ml. Animals may be observed for 21 to 42 days following challenge for clinical signs such as conjunctivitis, rhinitis, diarrhoea, vomiting, depression, dehydration, hyperthermia, pneumonia, ataxia, myoclonus, hyperesthesia, paralysis, paresis, seizures, eye symptoms (such as keratoconjunctivitis, chorioretinitis) and optic neuritis. During the challenge the animals may be blood sampled for complete blood counts and serology study (presence of CDV specific antibodies). In addition PCR may be carried out on samples of urine, tears, saliva, faeces and blood.
The compositions comprising the recombinant antigenic polypeptides of the invention used in the prime-boost protocols are contained in a pharmaceutically or veterinary acceptable vehicle, adjuvant, diluent or excipient. The protocols of the invention protect the animal from CDV and/or prevent disease progression in an infected animal.
The various administrations are preferably carried out 1 to 6 weeks apart. Preferred time interval is 3 to 5 weeks, and optimally 4 weeks According to one embodiment, an annual booster is also envisioned. The animals, for examples dogs, may be at least 8 weeks of age at the time of the first administration.
It should be understood by one of skill in the art that the disclosure herein is provided by way of example and the present invention is not limited thereto. From the disclosure herein and the knowledge in the art, the skilled artisan can determine the number of administrations, the administration route, and the doses to be used for each injection protocol, without any undue experimentation.
The present invention contemplates at least one administration to an animal of an efficient amount of the therapeutic composition made according to the invention. The animal may be male, female, pregnant female and newborn. This administration may be via various routes including, but not limited to, intramuscular (IM), intradermal (ID) or subcutaneous (SC) injection or via intranasal or oral administration. The therapeutic composition according to the invention can also be administered by a needleless apparatus (as, for example with a Pigjet, Dermojet, Biojector, Avijet (Merial, Ga., USA), Vetjet or Vitajet apparatus (Bioject, Oregon, USA)). Another approach to administering plasmid compositions is to use electroporation (see, e.g. Tollefsen et al., 2002; Tollefsen et al., 2003; Babiuk et al., 2002; PCT Application No. WO99/01158). In another embodiment, the therapeutic composition is delivered to the animal by gene gun or gold particle bombardment. In an advantageous embodiment, the animal is a dog, ferret or seal.
In one embodiment, the invention provides for the administration of a therapeutically effective amount of a formulation for the delivery and expression of a CDV antigen or epitope in a target cell. Determination of the therapeutically effective amount is routine experimentation for one of ordinary skill in the art. In one embodiment, the formulation comprises an expression vector comprising a polynucleotide that expresses a CDV antigen or epitope and a pharmaceutically or veterinarily acceptable carrier, vehicle, adjuvant, or excipient. In another embodiment, the pharmaceutically or veterinarily acceptable carrier, vehicle, adjuvant, or excipient facilitates transfection or infection and/or improves preservation of the vector or protein in a host.
In one embodiment, the invention provides for the administration of a therapeutically effective amount of a composition for the delivery and expression of a CDV HA polypeptide or antigen or epitope in a target cell. Determination of the therapeutically effective amount is routine experimentation for one of ordinary skill in the art. In one embodiment, the composition comprises an expression vector comprising a polynucleotide that expresses a CDV HA polypeptide or antigen or epitope and a pharmaceutically or veterinarily acceptable carrier, adjuvant, vehicle or excipient. In another embodiment, the pharmaceutically or veterinarily acceptable carrier, vehicle, adjuvant, or excipient facilitates transfection or infection and/or improves preservation of the vector or protein.
The pharmaceutically or veterinarily acceptable carriers or vehicles or excipients or adjuvants are well known to the one skilled in the art. For example, a pharmaceutically or veterinarily acceptable carrier or vehicle or excipient or adjuvant can be a 0.9% NaCl (e.g., saline) solution or a phosphate buffer. Other pharmaceutically or veterinarily acceptable carrier or vehicle or excipient or adjuvant that can be used for methods of this invention include, but are not limited to, poly-(L-glutamate) or polyvinylpyrrolidone. The pharmaceutically or veterinarily acceptable carrier or vehicle or excipient or adjuvant may be any compound or combination of compounds facilitating the administration of the vector (or protein expressed from an inventive vector in vitro); advantageously, the carrier, vehicle or excipient or adjuvant may facilitate transfection and/or improve preservation of the vector (or protein). Doses and dose volumes are herein discussed in the general description and can also be determined by the skilled artisan from this disclosure read in conjunction with the knowledge in the art, without any undue experimentation.
The cationic lipids containing a quaternary ammonium salt which are advantageously but not exclusively suitable for plasmids, are those having the following formula:
in which R1 is a saturated or unsaturated straight-chain aliphatic radical having 12 to 18 carbon atoms, R2 is another aliphatic radical containing 2 or 3 carbon atoms and X is an amine or hydroxyl group, e.g. the DMRIE. In another embodiment the cationic lipid can be associated with a neutral lipid, e.g. the DOPE.
Among these cationic lipids, preference is given to DMRIE (N-(2-hydroxyethyl)-N,N-dimethyl-2,3-bis(tetradecyloxy)-1-propane ammonium; WO96/34109), advantageously associated with a neutral lipid, advantageously DOPE (dioleoyl-phosphatidyl-ethanol amine; Behr, 1994), to form DMRIE-DOPE.
When DOPE is present, the DMRIE:DOPE molar ratio is advantageously about 95:about 5 to about 5:about 95, more advantageously about 1: about 1, e.g., 1:1.
In another embodiment, pharmaceutically or veterinarily acceptable carrier, excipient, vehicle or adjuvant may be a water-in-oil emulsion. Examples of suitable water-in-oil emulsions include oil-based water-in-oil vaccinal emulsions which are stable and fluid at 4° C. containing: from 6 to 50 v/v % of an antigen-containing aqueous phase, preferably from 12 to 25 v/v %, from 50 to 94 v/v % of an oil phase containing in total or in part a non-metabolizable oil (e.g., mineral oil such as paraffin oil) and/or metabolizable oil (e.g., vegetable oil, or fatty acid, polyol or alcohol esters), from 0.2 to 20 p/v % of surfactants, preferably from 3 to 8 p/v %, the latter being in total or in part, or in a mixture either polyglycerol esters, said polyglycerol esters being preferably polyglycerol (poly)ricinoleates, or polyoxyethylene ricin oils or else hydrogenated polyoxyethylene ricin oils. Examples of surfactants that may be used in a water-in-oil emulsion include ethoxylated sorbitan esters (e.g., polyoxyethylene (20) sorbitan monooleate (TWEEN 80®), available from AppliChem, Inc., Cheshire, Conn.) and sorbitan esters (e.g., sorbitan monooleate (SPAN 80®), available from Sigma Aldrich, St. Louis, Mo.). In addition, with respect to a water-in-oil emulsion, see also U.S. Pat. No. 6,919,084. In some embodiments, the antigen-containing aqueous phase comprises a saline solution comprising one or more buffering agents. An example of a suitable buffering solution is phosphate buffered saline. In one embodiment, the water-in-oil emulsion may be a water/oil/water (W/O/W) triple emulsion (U.S. Pat. No. 6,358,500). Examples of other suitable emulsions are described in U.S. Pat. No. 7,371,395.
The immunological compositions and vaccines according to the invention may comprise or consist essentially of one or more pharmaceutically or veterinarily acceptable carriers, excipients, vehicles or adjuvants. Suitable adjuvants for use in the practice of the present invention are (1) polymers of acrylic or methacrylic acid, maleic anhydride and alkenyl derivative polymers, (2) immunostimulating sequences (ISS), such as oligodeoxyribonucleotide sequences having one or more non-methylated CpG units (Klinman et al., 1996; WO98/16247), (3) an oil in water emulsion, such as the SPT emulsion described on page 147 of “Vaccine Design, The Subunit and Adjuvant Approach” published by M. Powell, M. Newman, Plenum Press 1995, and the emulsion MF59 described on page 183 of the same work, (4) cation lipids containing a quaternary ammonium salt, e.g., DDA (5) cytokines, (6) aluminum hydroxide or aluminum phosphate, (7) saponin or (8) other adjuvants discussed in any document cited and incorporated by reference into the instant application, or (9) any combinations or mixtures thereof.
The oil in water emulsion (3), which is especially appropriate for viral vectors, can be based on: light liquid paraffin oil (European pharmacopoeia type), isoprenoid oil such as squalane, squalene, oil resulting from the oligomerization of alkenes, e.g. isobutene or decene, esters of acids or alcohols having a straight-chain alkyl group, such as vegetable oils, ethyl oleate, propylene glycol, di(caprylate/caprate), glycerol tri(caprylate/caprate) and propylene glycol dioleate, or esters of branched, fatty alcohols or acids, especially isostearic acid esters.
The oil is used in combination with emulsifiers to form an emulsion. The emulsifiers may be nonionic surfactants, such as: esters of on the one hand sorbitan, mannide (e.g. anhydromannitol oleate), glycerol, polyglycerol or propylene glycol and on the other hand oleic, isostearic, ricinoleic or hydroxystearic acids, said esters being optionally ethoxylated, or polyoxypropylene-polyoxyethylene copolymer blocks, such as Pluronic, e.g., L121.
Among the type (1) adjuvant polymers, preference is given to polymers of crosslinked acrylic or methacrylic acid, especially crosslinked by polyalkenyl ethers of sugars or polyalcohols. These compounds are known under the name carbomer (Pharmeuropa, vol. 8, no. 2, June 1996). One skilled in the art can also refer to U.S. Pat. No. 2,909,462, which provides such acrylic polymers crosslinked by a polyhydroxyl compound having at least three hydroxyl groups, preferably no more than eight such groups, the hydrogen atoms of at least three hydroxyl groups being replaced by unsaturated, aliphatic radicals having at least two carbon atoms. The preferred radicals are those containing 2 to 4 carbon atoms, e.g. vinyls, allyls and other ethylenically unsaturated groups. The unsaturated radicals can also contain other substituents, such as methyl. Products sold under the name Carbopol (BF Goodrich, Ohio, USA) are especially suitable. They are crosslinked by allyl saccharose or by allyl pentaerythritol. Among them, reference is made to Carbopol 974P, 934P and 971P.
As to the maleic anhydride-alkenyl derivative copolymers, preference is given to EMA (Monsanto), which are straight-chain or crosslinked ethylene-maleic anhydride copolymers and they are, for example, crosslinked by divinyl ether.
With regard to structure, the acrylic or methacrylic acid polymers and EMA are preferably formed by basic units having the following formula:
in which:
For EMA, x=0 and y=2 and for carbomers x=y=1.
These polymers are soluble in water or physiological salt solution (20 g/l NaCl) and the pH can be adjusted to 7.3 to 7.4, e.g., by soda (NaOH), to provide the adjuvant solution in which the expression vector(s) can be incorporated. The polymer concentration in the final immunological or vaccine composition can range between about 0.01 to about 1.5% w/v, about 0.05 to about 1% w/v, and about 0.1 to about 0.4% w/v.
The cytokine or cytokines (5) can be in protein form in the immunological or vaccine composition, or can be co-expressed in the host with the immunogen or immunogens or epitope(s) thereof. Preference is given to the co-expression of the cytokine or cytokines, either by the same vector as that expressing the immunogen or immunogens or epitope(s) thereof, or by a separate vector thereof.
The invention comprehends preparing such combination compositions; for instance by admixing the active components, advantageously together and with an adjuvant, carrier, cytokine, and/or diluent.
Cytokines that may be used in the present invention include, but are not limited to, granulocyte colony stimulating factor (G-CSF), granulocyte/macrophage colony stimulating factor (GM-CSF), interferon α (IFNα), interferon β (IFNβ), interferon γ, (IFNγ), interleukin-1α(IL-1α), interleukin-1β (IL-1β), interleukin-2 (IL-2), interleukin-3 (IL-3), interleukin-4 (IL-4), interleukin-5 (IL-5), interleukin-6 (IL-6), interleukin-7 (IL-7), interleukin-8 (IL-8), interleukin-9 (IL-9), interleukin-10 (IL-10), interleukin-11 (IL-11), interleukin-12 (IL-12), tumor necrosis factor α (TNFα), tumor necrosis factor β (TNFβ), and transforming growth factor β (TGFβ). It is understood that cytokines can be co-administered and/or sequentially administered with the immunological or vaccine composition of the present invention. Thus, for instance, the vaccine of the instant invention can also contain an exogenous nucleic acid molecule that expresses in vivo a suitable cytokine, e.g., a cytokine matched to this host to be vaccinated or in which an immunological response is to be elicited (for instance, a canine cytokine for preparations to be administered to canine).
The invention will now be further described by way of the following non-limiting examples.
Without further elaboration, it is believed that one skilled in the art can, using the preceding descriptions, practice the present invention to its fullest extent. The following detailed examples are to be construed as merely illustrative, and not limitations of the preceding disclosure in any way whatsoever. Those skilled in the art will promptly recognize appropriate variations from the procedures both as to reactants and as to reaction conditions and techniques.
Construction of DNA inserts, plasmids and recombinant viral or plant vectors was carried out using the standard molecular biology techniques described by J. Sambrook et al. (Molecular Cloning: A Laboratory Manual, 2nd Edition, Cold Spring Harbor Laboratory, Cold Spring Harbor, N.Y., 1989).
The plasmid containing codon-optimized CDV HA gene (SEQ ID NO:1) (from Danish CDV strain) was digested with EcoRV and XhoI. The 1849 bP fragment containing 3′ sequence of vaccinia H6 promoter and full-length codon-optimized CDV HA gene was gel purified. Plasmid pCXL148.2 (pC5 donor plasmid, Merial proprietary material) was digested with EcoRV and Xho I to generate a 49851 by vector containing 5′ sequence of H6 promoter. The 1849 by insert was ligated to the 49851 by vector to generate the pC5 H6 CDV HA (pCXL1557.1). The construct was sequenced to confirm the correct sequence.
The plasmid containing the codon-optimized canine GM-CSF gene was digested with NruI/XhoI. The resulting canine GM-CSF DNA fragment was isolated and ligated to NruI/XhoI digested pJY19131.1 (Merial proprietary material) to create a C3 donor plasmid pJSY2218.1, which contains the expression cassette H6p (vaccinia H6 promoter)-canine GM-CSF in an opposite orientation against C3 arms. Plasmid pJSY2218.1 was sequenced and confirmed to have the correct sequence.
A. Generation of vCP2263
The donor plasmid pCXL1557.1 contains codon-optimized canine CDV HA gene (SEQ ID NO:1). Primary chicken embryo fibroblast (1° CEF) cells were used for in vitro recombination. 1° CEF cells were grown in 10% FBS (JRH: γ-irradiated #12107-500M), DMEM (BRL/Gibco #11960-051 or 11960-044) supplemented with 4 mM Glutamine (BRL/Gibco #25030-081) and 1 mM Sodium Pyruvate (BRL/Gibco #11360-070) in the presence of 1× antibiotics/antimycotics (P/S/A/A, BRL/Gibco #15240-062). Plaque hybridization with horseradish peroxidase (HRP)-labeled CDV synthetic HA specific probe was used for recombinant selection.
The IVR (in vitro recombinant) was performed by transfection of 1° CEF cells with 12 μg of Not I-linearized donor plasmid pCXL1557.1 using FuGENE-6® reagent (Roche). The transfected cells were subsequently infected with ALVAC as rescue virus at MOI (multiplicity of infection) of 10 (ALVAC Stock, 6.3×109 pfu/ml). After 24 hours, the transfected-infected cells were harvested, sonicated and used for recombinant virus screening. Recombinant plaques were screened based on the plaque lift hybridization method using a 1232 by synthetic HA specific probe labeled with horse radish peroxidase (HRP) according to the manufacturer's protocol (Amersham Cat #RPN3001,). After four sequential rounds of plaque purification, the recombinants designated as vCP2263.1.2.1.1 and vCP2263.6.1.1.1 were generated and confirmed by hybridization as 100% positive for the HA insert and 100% negative for the empty C5 site. Single plaques were selected from the 4th round of plaque purification, and expanded to obtain P1 (1×T25 flask per sister), P2 (1×T75 flask per sister) and P3 (4× roller bottles for vCP2263.1.2.1.1.) stocks to amplify vCP2263. The infected cell culture fluid from the roller bottles was harvested and concentrated to produce the virus stock.
B. Genomic Analysis
Genomic DNA from vCP2263.1.2.1.1 and vCP2263.6.1.1.1 was extracted, digested with BamHI, HindIII or Pst I and run on 0.8% agarose gel. The results revealed the correct insertion of CDV synthetic HA sequence.
Southern blot: The gel with BamHI, HindIII or PstI digested genomic DNA was transferred to nylon membrane and Southern blot analysis was performed by probing with a synthetic CDV HA specific probe. Single or double bands from all three digests were observed at the expected sizes: 1984 by BamHI, 12294 by HindIII and 6465 and 12119 bp PstI (see
Primers for Amplifying the Synthetic CDV HA Probe:
C. Expression Analysis
Western blot: 10 CEF cells were infected with the P2 stock at a MOI of 10 and incubated at 37° C. for 25 hrs. The cells and culture supernatant were then harvested. Sample proteins were separated on a 10% SDS-PAGE gel, transferred to Immobilon nylon membrane, and probed with rabbit anti-CDV polyclonal antibody (pool sera from rabbit A151, and 152 at 1 in 100 dilution). Peroxidase-conjugated Donkey anti-rabbit antiserum was used as a secondary antibody and the bands were visualized using luminol reagents. vCP2263.1211 showed a very weak single band at 73 kDa in the cell supernatant fraction, but no CDV specific band was detected in the cell pellet fraction (see
Immunoplaque: The homogeneity of the population was 100% for vCP2263.1.2.1.1, as evidenced by an immunoplaque assay, using the Rabbit anti-CDV antibody (see
D. Sequence Analysis
A more detailed analysis of the P3 stock genomic DNA was performed by PCR amplification and sequence analysis of the flanking arms of the C5 locus and the CDV synthetic HA insert. Primers 7931DC and 7932DC, located beyond the arms of the C5 locus in the ALVAC genome, were used to amplify the entire C5L-CDV synthetic HA-05R fragment. The results showed that the sequences of the CDV synthetic HA and C5L and C5R of ALVAC are correct.
Primers for PCR Amplification:
The DNA sequence flanked by primers 7931DC and 7932DC containing C5 arms, H6 promoter, and CDV synthetic HA is designated SEQ ID NO:14.
A. Generation of vCP2391
The donor plasmid pJSY2218.1 contains codon-optimized canine GM-CSF gene (SEQ ID NO:3). Primary chicken embryo fibroblast cells (1° CEF) were used for in vitro recombination. Plaque hybridization with horseradish peroxidase (HRP)-labeled Canine GM-CSF specific probe was used for recombinant selection.
The IVR was performed by transfection of 1° CEF cells with 10 μng of Not I-linearized donor plasmid pJSY2218.1 using FuGENE-6® reagent (Roche). The transfected cells were subsequently infected with ALVAC as rescue virus at MOI of 10. After 24 hours, the transfected-infected cells were harvested, sonicated and used for recombinant virus screening. Recombinant plaques were screened based on the plaque lift hybridization method using a 382 base canine GM-CSF specific probe labeled with horse radish peroxidase (HRP) according to the manufacturer's protocol (Amersham Cat #RPN3001). After two sequential rounds of plaque purification, the recombinant designated as vCP2391.4.4 was generated and confirmed by hybridization as 100% positive for the canine GM-CSF insert and 100% negative for the C3 ORF. Single plaque was selected from the 2nd round of plaque purification, and expanded to obtain P1 (1×T25 flask), P2 (1×T75 flask) and P3 (6× roller bottles).
B. Genomic Analysis—Southern Blot
Genomic DNA from vCP2391 was extracted, digested with BamHI, HindIII or Pst I and run on 0.8% agarose gel. The gel with BamHI, HindIII or PstI digested genomic DNA was transferred to a nylon membrane and Southern blot analysis was performed by probing with the 382 base caGM-CSF probe. Multiple bands were observed at the expected sizes, indicating the correct insertion of the caGM-CSF gene into the C3 locus.
Primers for Amplifying the Canine GM-CSF Probe
C. Expression Analysis
Western blot: Primary CEF cells were infected with the P3 stock of vCP2391.4.4 at MOI of 10 and incubated at 37° C. for 24 hrs. All the culture supernatant and cells were then harvested. Cell pellet was lysed with Reporter Gene Assay Lysis Buffer manufactured by Roche (Cat. 1 897 675). Both supernatant and cell lysate were prepared with the NuPage® System with addition of antioxidant. Proteins were separated on a NuPage® 10% Bis-Tris Pre-cast gel, and then transferred to a PVDF membrane. Purified goat anti-canine GM-CSF IgG (R&D Systems, Cat AF1546) was used as primary antibody. Western blot detected a major protein of ˜20 kDa and a minor protein of ˜17 kDa secreted from the supernatant of vCP2391.4.4 (see
D. Sequence Analysis
A more detailed analysis of the P3 stock genomic DNA of vCP2391.4.4 was performed by PCR amplification and sequence analysis of the flanking arms of the C3 locus and the canine GM-CSF insert. Primers 8103JY and 8104JY, located beyond the arms of the C3 locus in the ALVAC genome were used to amplify the entire C3L-caGM-CSF-C3R fragment. The results showed that the sequences of the canine GM-CSF insert and C3L and C3R of ALVAC are correct (SEQ ID NO: 19).
Primers for PCR amplification of C3L-Canine GM-CSF-C3R cassette:
ALVAC C5 H6p CDV (vCP2263.1.2.1.1) was used as a parental virus. pJSY2218.1 containing the codon-optimized canine GM-CSF gene was used as a donor plasmid. Primary chicken embryo fibroblast cells (1° CEF) were used for in vitro recombination. Plaque hybridization with horseradish peroxidase (HRP)-labeled Canine GM-CSF specific probe was used for recombinant selection.
The IVR was performed by transfection of 1° CEF cells with 10 μg of Not I-linearized donor plasmid pJSY2218.1 using FuGENE-6® reagent (Roche). The transfected cells were subsequently infected with vCP2263.1.2.1.1 as rescue virus at MOI of 10. After 24 hours, the transfected-infected cells were harvested, sonicated and used for recombinant virus screening. Recombinant plaques were screened based on the plaque lift hybridization method using a 382 base canine GM-CSF specific probe (example 4) labeled with horse radish peroxidase (HRP) according to the manufacturer's protocol (Amersham Cat #RPN3001). After four sequential rounds of plaque purification, the recombinant designated as vCP2392.5.3.1.1 was generated and confirmed by hybridization as 100% positive for the canine GM-CSF insert and 100% negative for the C3 ORF. Single plaque was selected from the 4th round of plaque purification, and expanded to obtain P1 (1×T25 flask), P2 (1×T75 flask) and P3 (6× roller bottles).
A. Genomic Analysis—Southern Blot
Genomic DNA from vCP2392 was extracted, digested with BamHI, HindIII or Pst I and run on 0.8% agarose gel. The gel with BamHI, HindIII or PstI digested genomic DNA was transferred to a nylon membrane and Southern blot analysis was performed by probing with the 382 base canine GM-CSF probe (example 4). Multiple bands were observed at the expected sizes, indicating the correct insertion of the canine GM-CSF gene into the C3 locus.
B. Expression Analysis
Western blot: Primary CEF cells were infected with the P3 stock of vCP2392.5.3.1.1 at MOI of 10 and incubated at 37° C. for 24 hrs. All the culture supernatant and cells were then harvested. Cell pellet was lysed with Reporter Gene Assay Lysis Buffer manufactured by Roche (Cat. 1 897 675). Both supernatant and cell lysate were prepared with the NuPage® System with addition of antioxidant. Proteins were separated on a NuPage® 10% Bis-Tris Pre-cast gel, and then transferred to a PVDF membrane. Purified goat anti-canine GM-CSF IgG (R&D Systems, Cat AF1546) was used as primary antibody. Western blot detected a major protein of ˜20 kDa and a minor protein of ˜17 kDa secreted from the supernatant of vCP2392.5.3.1.1. (see
C. Sequence Analysis
A more detailed analysis of the P3 stock genomic DNA of vCP2392.5.3.1.1 was performed by PCR amplification and sequence analysis of the flanking arms of the C3 locus and the canine GM-CSF insert. Primers 8103JY and 8104JY (see example 4), located beyond the arms of the C3 locus in the ALVAC genome, were used to amplify the entire C3L-caGM-CSF-C3R fragment. The results showed that the sequences of the canine GM-CSF insert and C3L and C3R of ALVAC are correct.
Eighteen CDV specific pathogen free dogs were used. The 4 month old male and female dogs were grouped into three groups, and were vaccinated and sampled as shown in Table 1 below.
Clinical examinations were performed on days: (V1) 0, 0+4/5 h, 1, 2, (V2) 28, 28+4/5 h, 29, 30, or until all symptoms had disappeared. Clinical monitoring included monitoring general condition of the dogs, such as rectal temperature, pain on palpation of injection site, local swelling, local heat, pruritus and local hair loss.
Sampling in plain tubes for serology was performed on days: 0, 13, 27, 35, 42, 56, and 70. Two types of SN were performed. CDV strain (BA5) which is heterologous to the CDV HA insert in vCP2392 and vCP2263 was used. The result is shown in
Sampling in heparinated tubes for monitoring of CMI was performed on days: 13, 42, and 70. The production of IFNγ was monitored using ELIspot assay upon PBMCs (peripheral blood mononuclear cells) re-stimulation with PBMCs nucleofected. The frequency of antigen specific IFNγ producing cells was calculated. The data is shown in
In summary: vCP2392 (CDV HA+canine GM-CSF) induces significantly higher serology responses compared to vCP2263 (CDV HA).
This study was designed to investigate whether vCP2392 (co-expressing CDV HA and canine GM-CSF) has a positive impact on the immunogenicity of other vaccine antigens.
A modified live canine parvovirus vaccine was used at a dose (2.6 log10 TCID50) which is well below the normal commercial dose. Twelve SPF (specific pathogen free) male and female beagle puppies (2-3 month old) were randomly assigned into two groups and vaccinated as shown in Table 2 below.
Clinical monitoring included general condition, rectal temperature, pain on palpation of injection site, local swelling, local heat and pruritus. The vaccines received were well tolerated by dogs in both groups A and B. vCP2392 (CDV HA+GM-CSF) and vCP2263 (CDV HA) in combination with MLV-CPV2 was considered safe based on the clinical study result.
Sera were titrated for antibodies against CPV2 and CDV (using homologous and heterologous CDV in seroneutralization test).
The study results showed that a dose of 2.6 log10 TCID50 of MLV-CPV2 per dog was under the minimum dose that can confer seroconversion, as shown in group B's result. Interestingly and surprisingly, the inclusion of GM-CSF in canarypox vector (vCP2392) induced different antibody response, as shown in group A's result. The results demonstrated that the presence of caGM-CSF in canarypox vector can have an effect on the immunogenicity of another vaccine component injected into the same site.
Having thus described in detail preferred embodiments of the present invention, it is to be understood that the invention defined by the above paragraphs is not to be limited to particular details set forth in the above description as many apparent variations thereof are possible without departing from the spirit or scope of the present invention.
All documents cited or referenced in the application cited documents, and all documents cited or referenced herein (“herein cited documents”), and all documents cited or referenced in herein cited documents, together with any manufacturer's instructions, descriptions, product specifications, and product sheets for any products mentioned herein or in any document incorporated by reference herein, are hereby incorporated herein by reference, and may be employed in the practice of the invention.
This application claims benefit of U.S. provisional application Ser. No. 61/308,620 filed Feb. 26, 2010.
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