期刊
UPSALA JOURNAL OF MEDICAL SCIENCES
卷 114, 期 4, 页码 235-241出版社
TAYLOR & FRANCIS LTD
DOI: 10.3109/03009730903276399
关键词
Muscle; myotilin; single membrane permeabilized muscle fiber; telethonin
资金
- Association Francaise contre les Myopathies
- Tore Nilsons Stiftelsen for Medicinsk Forskning
- Stiftelsen Apotekare Hedbergs Fond for Medicinsk Forskning
- Swedish Research Council [8651]
Background. Myofibrillar myopathies constitute a rare group of congenital neuromuscular disorders, frequently associated with mutations in Z-disc proteins such as myotilin. Myotilin location and interactions with other Z-disc proteins are clearly defined, but its role in the regulation of muscle structure and function remains unknown. The present study aims at investigating this specific role of myotilin. Methods. Skeletal and cardiac muscles were collected from adult mice with a targeted deletion of myotilin (myo(-/-)) and wildtype animals (myo(+/+)) Results and conclusion. Similar skeletal and cardiac muscle weights were observed in myo(-/-) and myo(+/+) mice. At the muscle cell level, the size and force production of single membrane permeabilized fibers were identical between myo(-/-) and myo(+/+) rodents. Thus, myotilin does not have a significant influence on muscle mass, muscle fiber size, or regulation of muscle contraction. Alternatively, compensatory over-expressions of other elements including proteins from the same subfamily, or Z-disc proteins such as telethonin, or intermediate filaments may compensate for the lack of myotilin.
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