Methods and compositions for treating skeletal muscular dystrophy

1. A method of improving skeletal muscle isometric force production in a skeletal muscle of a subject with muscular dystrophy in need of treatment for skeletal muscle myopathy, the method comprising administrating to the subject a therapeutically effective amount of cardiosphere-derived cells (CDCs).

2. The method according to claim 1 , wherein said therapeutically effective amount of CDCs is sufficient to treat a dystrophic skeletal muscle of the subject.

3. The method according to claim 2 , wherein said muscular dystrophy is Duchenne muscular dystrophy (DMD) involving dystrophinopathy of a skeletal muscle.

4. The method according to claim 2 , wherein said dystrophic skeletal muscle is a skeletal muscle of the diaphragm, the arm, or the leg.

5. The method according claim 2 , wherein said therapeutically effective amount of CDCs is administered to the subject systemically.

6. The method according to claim 5 , wherein said systemic administration of a therapeutically effective amount of CDCs is via intravenous injection.

7. The method according to claim 1 , wherein said administration of a therapeutically effective amount of CDCs is via two or more administrations.

8. The method according to claim 7 , wherein said two or more administrations of CDCs are given at intervals of about three months to deliver a therapeutically effective amount of CDCs at a targeted skeletal muscle.

9. The method according to claim 1 , wherein said therapeutically effective amount of CDCs is, or is at least 150×10 6 CDCs.

10. The method according to claim 1 , wherein said therapeutically effective amount of CDCs is, or is at least 300×10 6 CDCs.

11. The method according to claim 1 , wherein said therapeutically effective amount of CDCs is, or is at least 450×10 6 CDCs.

12. The method according to claim 1 , wherein said CDCs are allogeneic human CDCs, and the subject is a human subject.

13. A method of improving skeletal muscle isometric force production in a skeletal muscle of a subject with muscular dystrophy in need of treatment for skeletal muscle myopathy, the method comprising:

administering to the subject a first dose of a composition comprising a therapeutically effective amount of cardiosphere-derived cells (CDCs),

wherein the therapeutically effective amount of the first dose ranges from about 1×10 7 to about 1×10 9 CDCs;

waiting a first period of time after administration of said first dose,

wherein said first period of time is between about 1 and 6 months;

administering to the subject a second dose of a composition comprising a therapeutically effective amount of cardiosphere-derived cells (CDCs),

wherein the therapeutically effective amount of the second dose ranges from about 1×10 7 to about 1×10 9 CDCs;

waiting a second period of time after administration of said second dose,

wherein said second period of time is between about 1 and 6 months;

administering to the subject at least one additional dose of a composition comprising a therapeutically effective amount of cardiosphere-derived cells (CDCs),

wherein the therapeutically effective amount of the at least one additional dose ranges from about 1×10 7 to about 1×10 9 CDCs;

waiting at least one additional period of time after administration of said at least one additional dose,

wherein said at least one additional period of time is between about 1 and 6 months;

wherein said administrations result in an improvement in exercise capacity or muscle function,

wherein said CDCs are allogeneic with respect to said subject,

wherein said administrations do not induce a significant immune response in the subject, and

wherein said administrations comprise systemic administration.

14. The method of claim 13 , wherein said systemic administration is via intravenous injection.

15. The method of claim 13 , wherein said administrations alter expression of one or more markers of T cell activation or proliferation.

16. The method of claim 13 , wherein said skeletal muscular dystrophy is Duchenne muscular dystrophy (DMD) involving dystrophinopathy of a skeletal muscle.

17. The method according to claim 13 , wherein said dystrophic skeletal muscle is a skeletal muscle of the diaphragm, the arm, or the leg.

18. A method of improving skeletal muscle isometric force production in a skeletal muscle of a subject with muscular dystrophy in need of treatment for skeletal muscle myopathy, the method comprising:

administrating to the subject at least two doses of a therapeutically effective amount of cardiosphere-derived cells (CDCs);

wherein the at least two doses are administered about 1 to 6 months apart from each other; and

wherein said administrating to the subject at least two doses of a therapeutically effective amount of CDCs does not induce a significant immune response in the subject.

19. The method according to claim 18 , wherein said skeletal muscular dystrophy comprises Duchenne muscular dystrophy (DMD) involving dystrophinopathy of a skeletal muscle.

20. The method according to claim 19 , wherein said dystrophic skeletal muscle comprises a skeletal muscle of the diaphragm, the arm, or the leg,

wherein administrating to the subject at least two doses of a therapeutically effective amount of CDCs comprises intramuscular injection at a dystrophic skeletal muscle of the subject, systemic administration, or intravenous injection,

wherein said systemic administration comprises injection into the right ventricle of the subject's heart, or injection into the left ventricle of the subject's heart,

wherein the at least two doses are administered about 6 weeks apart from each other, wherein said therapeutically effective amount of CDCs comprises about 1×10 7 to about 1×10 9 CDCs,

and wherein said CDCs are allogeneic human CDCs, and the subject is a human.