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Publication : Loss of sarcolemma nNOS in sarcoglycan-deficient muscle.

First Author  Crosbie RH Year  2002
Journal  FASEB J Volume  16
Issue  13 Pages  1786-91
PubMed ID  12409321 Mgi Jnum  J:79950
Mgi Id  MGI:2429326 Doi  10.1096/fj.02-0519com
Citation  Crosbie RH, et al. (2002) Loss of sarcolemma nNOS in sarcoglycan-deficient muscle. FASEB J 16(13):1786-91
abstractText  nNOS, anchored to the sarcolemma through its interactions with the dystrophin-glycoprotein complex, is dramatically reduced in dystrophin-deficient 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 alpha-, beta-, delta-, and gamma-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.
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