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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
The NO way to increase muscular utrophin expression?
Duchenne muscular dystrophy (DMD), a severe X-linked recessive disorder that results in progressive muscle degeneration, is due to a lack of dystrophin, a membrane cytoskeletal protein. An approach to the search for a treatment is to compensate for dystrophin loss by utrophin, another cytoskeletal protein. During development, in normal as in dystrophic embryos, utrophin is found at the membrane surface of immature skeletal fibres and is progressively replaced by dystrophin. Thus, it is possible to consider utrophin as a 'foetal homologue' of dystrophin. In a previous work, we studied the effect of L-arginine, the substrate of nitric oxide synthetase (NOS), on utrophin expression at the muscle membrane. Using a novel antibody, we confirm here that the immunocytochemical staining was indeed due to an increase in utrophin at the sarcolemma. The result is observed not only on mdx (an animal model of DMD) myotubes in culture but also in mdx mice treated with L-arginine. In addition, we show here the utrophin increase in muscle extracts of mdx mice treated with L-arginine, after electrophoretic separation and western-blotting using this novel antibody, and thus extending the electrophoretic results previously obtained on myotube cultures to muscles of treated mice.
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