Compositions and methods for expression of multiple biologically active polypeptides from a single vector for treatment of cardiac conditions and other pathologies
The present invention provides compositions and methods useful for treating disorders amenable to therapy via introduction of multigenic expression vectors. More particularly, the invention provides vectors and polynucleotides encoding polypeptides for treatment of cardiac disorders wherein said polypeptides may comprise a cytokine, a chemokine, and/or an angiogenic polypeptide, or functional derivatives thereof. Also provided, as compositions of the invention, are linkers useful for connecting and expressing functional (biologically active) polypeptides from single, multigenic-expression constructs.
1. A polynucleotide that encodes a polypeptide that comprises a S100 calcium binding protein (S100) polypeptide that comprises the sequence of SEQ ID NO: 104, a stromal cell derived factor (SDF) polypeptide that comprises the sequence of SEQ ID NO: 102, and a vascular endothelial growth factor (VEGF) polypeptide that comprises the sequence of SEQ ID NO: 106, wherein said S100 polypeptide, said SDF polypeptide, and said VEGF polypeptide are separated from each other by one or more in vivo cleavable linkers.
2. The polynucleotide of claim 1 , wherein said one or more in vivo cleavable linkers comprises a 2A peptide that mediates a ribosome skipping translational effect.
3. The polynucleotide of claim 1 , wherein said one or more in vivo cleavable linkers are selected from the group consisting of a furin linker, a fp2a linker, a p2a linker, a GSG-p2a linker, a fmdv linker, and any combination thereof.
4. The polynucleotide of claim 3 , wherein said one or more in vivo cleavable linkers further comprise a sequence selected from the group consisting of APVKQ (SEQ ID NO: 42), GPVKQ (SEQ ID NO: 43), VPVKQ (SEQ ID NO: 44), IPVKQ (SEQ ID NO: 45), MPVKQ (SEQ ID NO: 46), APIKQ (SEQ ID NO: 47), GPIKQ (SEQ ID NO: 48), VPIKQ (SEQ ID NO: 49), IPIKQ (SEQ ID NO: 50), MPIKQ (SEQ ID NO: 51), APAKQ (SEQ ID NO: 52), GPAKQ (SEQ ID NO: 53), VPAKQ (SEQ ID NO: 54), IPAKQ (SEQ ID NO: 55), MPAKQ (SEQ ID NO: 56), APVRQ (SEQ ID NO: 57), GPVRQ (SEQ ID NO: 58), VPVRQ (SEQ ID NO: 59), IPVRQ (SEQ ID NO: 60), MPVRQ (SEQ ID NO: 61), APIRQ (SEQ ID NO: 62), GPIRQ (SEQ ID NO: 63), VPIRQ (SEQ ID NO: 64), IPIRQ (SEQ ID NO: 65), MPIRQ (SEQ ID NO: 66), APARQ (SEQ ID NO: 67), GPRAQ (SEQ ID NO: 68), VPARQ (SEQ ID NO: 69), IPARQ (SEQ ID NO: 70), MPARQ (SEQ ID NO: 71), APVKN (SEQ ID NO: 72), GPVKN (SEQ ID NO: 73), VPVKN (SEQ ID NO: 74), IPVKN (SEQ ID NO: 75), MPVKN (SEQ ID NO: 76), APIKN (SEQ ID NO: 77), GPIKN (SEQ ID NO: 78), VPIKN (SEQ ID NO: 79), IPIKN (SEQ ID NO: 80), MPIKN (SEQ ID NO: 81), APAKN (SEQ ID NO: 82), GPAKN (SEQ ID NO: 83), VPAKN (SEQ ID NO: 84), IPAKN (SEQ ID NO: 85), IVIPAKN (SEQ ID NO: 86), APVRN (SEQ ID NO: 87), GPVRN (SEQ ID NO: 88), VPVRN (SEQ ID NO: 89), IPVRN (SEQ ID NO: 90), IVIPVRN (SEQ ID NO: 91), APIRN (SEQ ID NO: 92), GPIRN (SEQ ID NO: 93), VPIRN (SEQ ID NO: 94), IPIRN (SEQ ID NO: 95), MPIRN (SEQ ID NO: 96), APARN (SEQ ID NO: 97), GPARN (SEQ ID NO: 98), VPARN (SEQ ID NO: 99), IPARN (SEQ ID NO: 100) or MPARN (SEQ ID NO: 101).
5. The polynucleotide of claim 1 , wherein said one or more in vivo cleavable linkers comprise a sequence as shown in SEQ ID NO: 32, SEQ ID NO: 34, SEQ ID NO: 36, SEQ ID NO: 38, or SEQ ID NO: 40.
6. A cell comprising the polynucleotide of claim 1 .
7. An expression vector comprising the polynucleotide of claim 1 , wherein said polynucleotide is operably linked to a promoter.
8. The expression vector of claim 7 , wherein said promoter is a constitutive promoter, a tissue specific promoter, or an inducible promoter.
9. The expression vector of claim 8 , wherein said inducible promoter is a small molecule ligand-inducible two polypeptide ecdysone receptor-based gene switch.
10. The expression vector of claim 8 , wherein said promoter is a cardiac promoter.
11. A pharmaceutical composition comprising: the polynucleotide of claim 1 and a pharmaceutically acceptable excipient.
12. A method comprising: contacting at least one cardiac cell with the polynucleotide of claim 1 .
13. The method of claim 12 , wherein said cardiac cell is a myocardial cell.
14. A polynucleotide that encodes a polypeptide that comprises a S100 calcium-binding protein (S100) polypeptide, a stromal cell derived factor (SDF) polypeptide, and a vascular endothelial growth factor (VEGF) polypeptide, wherein said polynucleotide comprises the sequence of SEQ ID NO: 108.