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- W2048658426 abstract "The mechanism of force reduction is not completely understood in Duchenne muscular dystrophy (DMD), a dystrophin-deficient lethal disease. Nitric oxide regulates muscle force. Interestingly, neuronal nitric oxide synthase µ (nNOSµ), a major source of muscle nitric oxide, is lost from the sarcolemma in DMD muscle. We hypothesize that nNOSµ delocalization contributes to force reduction in DMD. To test this hypothesis, we generated dystrophin/nNOSµ double knockout mice. Genetic elimination of nNOSµ significantly enhanced force in dystrophin-null mice. Pharmacological inhibition of nNOS yielded similar results. To further test our hypothesis, we studied δ-sarcoglycan-null mice, a model of limb-girdle muscular dystrophy. These mice had minimal sarcolemmal nNOSµ delocalization and muscle force was less compromised. Annihilation of nNOSµ did not improve their force either. To determine whether nNOSµ delocalization itself inhibited force, we corrected muscle disease in dystrophin-null mice with micro-dystrophins that either restored or did not restore sarcolemmal nNOSµ. Similar muscle force was obtained irrespective of nNOSµ localization. Additional studies suggest that nNOSµ delocalization selectively inhibits muscle force in dystrophin-null mice via nitrosative stress. In summary, we have demonstrated for the first time that nitrosative stress elicited by nNOSµ delocalization is an important mechanism underlying force loss in DMD." @default.
- W2048658426 created "2016-06-24" @default.
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- W2048658426 date "2010-10-28" @default.
- W2048658426 modified "2023-10-18" @default.
- W2048658426 title "Nitrosative stress elicited by nNOSµ delocalization inhibits muscle force in dystrophin-null mice" @default.
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- W2048658426 doi "https://doi.org/10.1002/path.2799" @default.
- W2048658426 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3109084" @default.
- W2048658426 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/21125668" @default.
- W2048658426 hasPublicationYear "2010" @default.
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