期刊
NEUROMUSCULAR DISORDERS
卷 19, 期 11, 页码 766-772出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.nmd.2009.08.003
关键词
IBMPFD; Inclusion body myopathy; Paget's disease of the bone; Frontotemporal dementia; VCP (valosin containing protein); Vacuoles; Myoblasts
资金
- German Ministry of Education and Research (BMBF, Bonn, Germany)
- National Institute of Health [R01AR050236, AG025159, NS21328, NS41850, AG13154, AC24373, AG16573]
- Muscular Dystrophy Association
- Fondazione Telethon Funding Source: Custom
Inclusion body myopathy associated with Paget's disease and frontotemporal dementia (IBMPFD) is caused by mutations in the valosin containing protein (VCP) gene. The disease is associated with progressive proximal muscle weakness, inclusions and vacuoles in muscle fibers, malfunction in the bone remodeling process resulting in Paget's disease, and premature frontotemporal dementia. VCP is involved in several cellular processes related to the endoplasmic reticulum associated degradation of proteins. To understand the pathological mechanisms underlying the myopathy in IBMPFD, we have studied the cellular consequences of VCP mutations in human primary myoblasts. Our results revealed that patients' myoblasts accumulate large vacuoles. Lysosomal membrane proteins Lamp1 and Lamp2 show increased molecular weights in patients' myoblasts due to differential N-glycosylation. Additionally, mutant myoblasts show increased autophagy when cultured in the absence of nutrients, as well as defective cell fusion and increased apoptosis. Our results elucidate that VCP mutations result in disturbances in several cellular processes, which will help us in the understanding of the pathological mechanisms resulting in muscle weakness and other features of VCP associated disease. Published by Elsevier B.V.
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