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Antibody formation and mannose-6-phosphate receptor expression impact the efficacy of muscle-specific transgene expression in murine Pompe disease.

Publication ,  Journal Article
Sun, B; Li, S; Bird, A; Yi, H; Kemper, A; Thurberg, BL; Koeberl, DD
Published in: J Gene Med
November 2010

BACKGROUND: Lysosomal storage disorders such as Pompe disease can be more effectively treated, if immune tolerance to enzyme or gene replacement therapy can be achieved. Alternatively, immune responses against acid α-glucosidase (GAA) might be evaded in Pompe disease through muscle-specific expression of GAA with adeno-associated virus (AAV) vectors. METHODS: An AAV vector containing the MHCK7 regulatory cassette to drive muscle-specific GAA expression was administered to GAA knockout (KO) mice, immune tolerant GAA-KO mice and mannose-6-phosphate deficient GAA-KO mice. GAA activity and glycogen content were analyzed in striated muscle to determine biochemical efficacy. RESULTS: The biochemical efficacy from GAA expression was slightly reduced in GAA-KO mice, as demonstrated by higher residual glycogen content in skeletal muscles. Next, immune tolerance to GAA was induced in GAA-KO mice by co-administration of a second AAV vector encoding liver-specific GAA along with the AAV vector encoding muscle-specific GAA. Antibody formation was prevented by liver-specific GAA, and the biochemical efficacy of GAA expression was improved in the absence of antibodies, as demonstrated by significantly reduced glycogen content in the diaphragm. Efficacy was reduced in old GAA-KO mice despite the absence of antibodies. The greatest impact upon gene therapy was observed in GAA-KO mice lacking the mannose-6-phosphate receptor in muscle. The clearance of stored glycogen was markedly impaired despite high GAA expression in receptor-deficient Pompe disease mice. CONCLUSIONS: Overall, antibody formation had a subtle effect upon efficacy, whereas the absence of mannose-6-phosphate receptors markedly impaired muscle-targeted gene therapy in murine Pompe disease.

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Published In

J Gene Med

DOI

EISSN

1521-2254

Publication Date

November 2010

Volume

12

Issue

11

Start / End Page

881 / 891

Location

England

Related Subject Headings

  • alpha-Glucosidases
  • Transgenes
  • Receptor, IGF Type 2
  • Muscle, Skeletal
  • Mice, Knockout
  • Mice
  • Glycogen Storage Disease Type II
  • Glycogen
  • Genetic Vectors
  • Genetic Therapy
 

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Sun, B., Li, S., Bird, A., Yi, H., Kemper, A., Thurberg, B. L., & Koeberl, D. D. (2010). Antibody formation and mannose-6-phosphate receptor expression impact the efficacy of muscle-specific transgene expression in murine Pompe disease. J Gene Med, 12(11), 881–891. https://doi.org/10.1002/jgm.1511
Sun, Baodong, Songtao Li, Andrew Bird, Haiqing Yi, Alex Kemper, Beth L. Thurberg, and Dwight D. Koeberl. “Antibody formation and mannose-6-phosphate receptor expression impact the efficacy of muscle-specific transgene expression in murine Pompe disease.J Gene Med 12, no. 11 (November 2010): 881–91. https://doi.org/10.1002/jgm.1511.
Sun, Baodong, et al. “Antibody formation and mannose-6-phosphate receptor expression impact the efficacy of muscle-specific transgene expression in murine Pompe disease.J Gene Med, vol. 12, no. 11, Nov. 2010, pp. 881–91. Pubmed, doi:10.1002/jgm.1511.
Sun B, Li S, Bird A, Yi H, Kemper A, Thurberg BL, Koeberl DD. Antibody formation and mannose-6-phosphate receptor expression impact the efficacy of muscle-specific transgene expression in murine Pompe disease. J Gene Med. 2010 Nov;12(11):881–891.
Journal cover image

Published In

J Gene Med

DOI

EISSN

1521-2254

Publication Date

November 2010

Volume

12

Issue

11

Start / End Page

881 / 891

Location

England

Related Subject Headings

  • alpha-Glucosidases
  • Transgenes
  • Receptor, IGF Type 2
  • Muscle, Skeletal
  • Mice, Knockout
  • Mice
  • Glycogen Storage Disease Type II
  • Glycogen
  • Genetic Vectors
  • Genetic Therapy