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Type: Journal article
Title: Conditional tissue-specific expression of the acid α-glucosidase (GAA) gene in the GAA knockout mice: implications for therapy
Other Titles: Conditional tissue-specific expression of the acid alpha-glucosidase (GAA) gene in the GAA knockout mice: implications for therapy
Author: Raben, N.
Lu, N.
Nagaraju, K.
Rivera, Y.
Lee, A.
Yan, B.
Byrne, B.
Meikle, P.
Umapathysivam, K.
Hopwood, J.
Plotz, P.
Citation: Human Molecular Genetics, 2001; 10(19):2039-2047
Publisher: Oxford Univ Press
Issue Date: 2001
ISSN: 0964-6906
Statement of
N. Raben, N. Lu, K. Nagaraju, Y. Rivera, A. Lee, B. Yan, B. Byrne, P.J. Meikle, K. Umapathysivam, J.J. Hopwood and P.H. Plotz
Abstract: Both enzyme replacement and gene therapy of lysosomal storage disorders rely on the receptor-mediated uptake of lysosomal enzymes secreted by cells, and for each lysosomal disorder it is necessary to select the correct cell type for recombinant enzyme production or for targeting gene therapy. For example, for the therapy of Pompe disease, a severe metabolic myopathy and cardiomyopathy caused by deficiency of acid -glucosidase (GAA), skeletal muscle seems an obvious choice as a depot organ for local therapy and for the delivery of the recombinant enzyme into the systemic circulation. Using knockout mice with this disease and transgenes containing cDNA for the human enzyme under muscle or liver specific promoters controlled by tetracycline, we have demonstrated that the liver provided enzyme far more efficiently. The achievement of therapeutic levels with skeletal muscle transduction required the entire muscle mass to produce high levels of enzyme of which little found its way to the plasma, whereas liver, comprising <5% of body weight, secreted 100-fold more enzyme, all of which was in the active 110 kDa precursor form. Furthermore, using tetracycline regulation, we somatically induced human GAA in the knockout mice, and demonstrated that the skeletal and cardiac muscle pathology was completely reversible if the treatment was begun early.
Keywords: Muscle, Skeletal
Cells, Cultured
Mice, Transgenic
Mice, Knockout
Glycogen Storage Disease Type II
Blotting, Western
Reverse Transcriptase Polymerase Chain Reaction
Organ Specificity
Gene Expression
Gene Expression Regulation, Enzymologic
Genetic Therapy
Rights: © 2001 Oxford University Press
DOI: 10.1093/hmg/10.19.2039
Appears in Collections:Aurora harvest
Paediatrics publications

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