Abstract
Gene therapy is under advanced clinical development for several lysosomal storage disorders. Pompe disease, a debilitating neuromuscular illness affecting infants, children, and adults with different severity, is caused by a deficiency of lysosomal glycogen-degrading enzyme acid α-glucosidase (GAA). Here, we demonstrated that adeno-associated virus–mediated (AAV-mediated) systemic gene transfer reversed glycogen storage in all key therapeutic targets — skeletal and cardiac muscles, the diaphragm, and the central nervous system — in both young and severely affected old Gaa-knockout mice. Furthermore, the therapy reversed secondary cellular abnormalities in skeletal muscle, such as those in autophagy and mTORC1/AMPK signaling. We used an AAV9 vector encoding a chimeric human GAA protein with enhanced uptake and secretion to facilitate efficient spread of the expressed protein among multiple target tissues. These results lay the groundwork for a future clinical development strategy in Pompe disease.
Authors
Naresh K. Meena, Davide Randazzo, Nina Raben, Rosa Puertollano
Figure 5
Muscle glycogen, autophagosomal-lysosomal markers, and mTORC1/AMPK signaling return to near normal after short-term systemic gene transfer at an intermediate vector dose.
