Journal
MOLECULAR THERAPY-METHODS & CLINICAL DEVELOPMENT
Volume 18, Issue -, Pages 199-214Publisher
CELL PRESS
DOI: 10.1016/j.omtm.2020.05.026
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Funding
- Intramural Research Program of the NHLBI of the National Institutes of Health
- NIH
- Amicus Therapeutics
- NATIONAL HEART, LUNG, AND BLOOD INSTITUTE [ZIAHL000140] Funding Source: NIH RePORTER
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Pompe disease, a deficiency of glycogen-degrading lysosomal acid alpha-glucosidase (GAA), is a disabling multisystemic illness that invariably affects skeletal muscle in all patients. The patients still carry a heavy burden of the disease, despite the currently available enzyme replacement therapy. We have previously shown that progressive entrapment of glycogen in the lysosome in muscle sets in motion a whole series of extralysosomal events including defective autophagy and disruption of a variety of signaling pathways. Here, we report that metabolic abnormalities and energy deficit also contribute to the complexity of the pathogenic cascade. A decrease in the metabolites of the glycolytic pathway and a shift to lipids as the energy source are observed in the diseased muscle. We now demonstrate in a pre-clinical study that a recently developed replacement enzyme (recombinant human GAA; AT-GAA; Amicus Therapeutics) with much improved lysosome-targeting properties reversed or significantly improved all aspects of the disease pathogenesis, an outcome not observed with the current standard of care. The therapy was initiated in GAA-deficient mice with fully developed muscle pathology but without obvious clinical symptoms; this point deserves consideration.
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