Journal Article

Transgenic mice expressing mutant caveolin-3 show severe myopathy associated with increased nNOS activity

Yoshihide Sunada, Hiroko Ohi, Asako Hase, Hiroaki Ohi, Tomohiko Hosono, Satoru Arata, Shigesada Higuchi, Kiichiro Matsumura and Teruo Shimizu

in Human Molecular Genetics

Volume 10, issue 3, pages 173-178
Published in print February 2001 | ISSN: 0964-6906
Published online February 2001 | e-ISSN: 1460-2083 | DOI: http://dx.doi.org/10.1093/hmg/10.3.173
Transgenic mice expressing mutant caveolin-3 show severe myopathy associated with increased nNOS activity

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Caveolin-3 is the muscle-specific isoform of the caveolin protein family, which is a major component of caveolae, small membrane invaginations found in most cell types. Caveolins play important roles in the formation of caveola membranes, acting as scaffolding proteins to organize and concentrate lipid-modified signaling molecules, and modulate a signaling pathway. For instance, caveolin-3 interacts with neuronal nitric oxide synthase (nNOS) and inhibits its catalytic activity. Recently, specific mutations in the caveolin-3 gene, including the Pro104Leu missense mutation, have been shown to cause an autosomal dominant limb-girdle muscular dystrophy (LGMD1C), which is characterized by the deficiency of caveolin-3 in the sarcolemma. However, the molecular mechanism by which these mutations cause the deficiency of caveolin-3 and muscle cell degeneration remains elusive. Here we generated transgenic mice expressing the Pro104Leu mutant caveolin-3. They showed severe myopathy accompanied by the deficiency of caveolin-3 in the sarcolemma, indicating a dominant negative effect of mutant caveolin-3. Interestingly, we also found a great increase of nNOS activity in their skeletal muscle, which, we propose, may play a role in muscle fiber degeneration in caveolin-3 deficiency.

Journal Article.  3984 words.  Illustrated.

Subjects: Genetics and Genomics

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