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Loss of sarcolemma nNOS in sarcoglycan‐deficient muscle
Author(s) -
Crosbie Rachelle H.,
Barresi Rita,
Campbell Kevin P.
Publication year - 2002
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fj.02-0519com
Subject(s) - sarcolemma , muscular dystrophy , dystrophin , itga7 , dysferlin , limb girdle muscular dystrophy , duchenne muscular dystrophy , biology , myopathy , pathology , microbiology and biotechnology , mutation , chemistry , myocyte , genetics , medicine , gene
nNOS, anchored to the sarcolemma through its interactions with the dystrophin–glycoprotein complex, is dramatically reduced in dystrophindeficient mdx mice and Duchenne muscular dystrophy patients. Recent evidence suggests that loss of nNOS in dystrophin‐deficient muscle may contribute significantly to the progression of muscle pathology through a variety of mechanisms. To investigate whether nNOS plays a role in other forms of muscular dystrophy, we analyzed protein expression of nNOS in several sarcoglycan‐deficient animal models of muscular dystrophy as well as patients with primary mutations in the sarcoglycan genes. Primary mutations in α‐, β‐, δ‐, and γ‐sarcoglycan result in autosomal recessive limb girdle muscular dystrophy (AR‐LGMD). We report that loss of the sarcoglycan–sarcospan complex in muscle causes a dramatic reduction in the levels of nNOS expression at the membrane, even in the presence of normal dystrophin and syntrophin expression. Furthermore, we show that expression of three out of four sarcoglycans is not sufficient to maintain nNOS at the sarcolemma. Our data suggest that loss of nNOS may contribute to muscle pathology in AR‐LGMD with primary mutations in the sarcoglycans.—Crosbie, R. H., Barresi, R., Campbell, K. P. Loss of sarcolemma nNOS in sarcoglycandeficient muscle. FASEB J . 16, 1786–1791 (2002)