Dysfunction of endocytic and autophagic pathways in a lysosomal storage disease.

Abstract:

OBJECTIVE:To understand the mechanisms of skeletal muscle destruction and resistance to enzyme replacement therapy in Pompe disease, a deficiency of lysosomal acid alpha-glucosidase (GAA), in which glycogen accumulates in lysosomes primarily in cardiac and skeletal muscles. METHODS:We have analyzed compartments of the lysosomal degradative pathway in GAA-deficient myoblasts and single type I and type II muscle fibers isolated from wild-type, untreated, and enzyme replacement therapy-treated GAA knock-out mice. RESULTS:Studies in myoblasts from GAA knock-out mice showed a dramatic expansion of vesicles of the endocytic/autophagic pathways, decreased vesicular movement in overcrowded cells, and an acidification defect in a subset of late endosomes/lysosomes. Analysis by confocal microscopy of isolated muscle fibers demonstrated that the consequences of the lysosomal glycogen accumulation are strikingly different in type I and II muscle fibers. Only type II fibers, which are the most resistant to therapy, contain large regions of autophagic buildup that span the entire length of the fibers. INTERPRETATION:The vastly increased autophagic buildup may be responsible for skeletal muscle damage and prevent efficient trafficking of replacement enzyme to lysosomes.

journal_name

Ann Neurol

journal_title

Annals of neurology

authors

Fukuda T,Ewan L,Bauer M,Mattaliano RJ,Zaal K,Ralston E,Plotz PH,Raben N

doi

10.1002/ana.20807

keywords:

subject

Has Abstract

pub_date

2006-04-01 00:00:00

pages

700-8

issue

4

eissn

0364-5134

issn

1531-8249

journal_volume

59

pub_type

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