Peripheral nerve and neuromuscular junction pathology in Pompe disease.

Published

Journal Article

Pompe disease is a systemic metabolic disorder characterized by lack of acid-alpha glucosidase (GAA) resulting in ubiquitous lysosomal glycogen accumulation. Respiratory and ambulatory dysfunction are prominent features in patients with Pompe yet the mechanism defining the development of muscle weakness is currently unclear. Transgenic animal models of Pompe disease mirroring the patient phenotype have been invaluable in mechanistic and therapeutic study. Here, we demonstrate significant pathological alterations at neuromuscular junctions (NMJs) of the diaphragm and tibialis anterior muscle as prominent features of disease pathology in Gaa knockout mice. Postsynaptic defects including increased motor endplate area and fragmentation were readily observed in Gaa(-/-) but not wild-type mice. Presynaptic neuropathic changes were also evident, as demonstrated by significant reduction in the levels of neurofilament proteins, and alterations in axonal fiber diameter and myelin thickness within the sciatic and phrenic nerves. Our data suggest the loss of NMJ integrity is a primary contributor to the decline in respiratory and ambulatory function in Pompe and arises from both pre- and postsynaptic pathology. These observations highlight the importance of systemic phenotype correction, specifically restoration of GAA to skeletal muscle and the nervous system for treatment of Pompe disease.

Full Text

Duke Authors

Cited Authors

  • Falk, DJ; Todd, AG; Lee, S; Soustek, MS; ElMallah, MK; Fuller, DD; Notterpek, L; Byrne, BJ

Published Date

  • February 2015

Published In

Volume / Issue

  • 24 / 3

Start / End Page

  • 625 - 636

PubMed ID

  • 25217571

Pubmed Central ID

  • 25217571

Electronic International Standard Serial Number (EISSN)

  • 1460-2083

International Standard Serial Number (ISSN)

  • 0964-6906

Digital Object Identifier (DOI)

  • 10.1093/hmg/ddu476

Language

  • eng