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Hypernitrosylated ryanodine receptor calcium release channels are leaky in dystrophic muscle
Open accessAbstract
Duchenne muscular dystrophy is characterized by progressive muscle weakness and early death resulting from dystrophin deficiency. Loss of dystrophin results in disruption of a large dystrophin glycoprotein complex, leading to pathological calcium (Ca2+)-dependent signals that damage muscle cells. We have identified a structural and functional defect in the ryanodine receptor (RyR1), a sarcoplasmic reticulum Ca2+ release channel, in the mdx mouse model of muscular dystrophy that contributes to altered Ca2+ homeostasis in dystrophic muscles. RyR1 isolated from mdx skeletal muscle showed an age-dependent increase in S-nitrosylation coincident with dystrophic changes in the muscle. RyR1 S-nitrosylation depleted the channel complex of FKBP12 (also known as calstabin-1, for calcium channel stabilizing binding protein), resulting in 'leaky' channels. Preventing calstabin-1 depletion from RyR1 with S107, a compound that binds the RyR1 channel and enhances the binding affinity of calstabin-1 to the nitrosylated channel, inhibited sarcoplasmic reticulum Ca2+ leak, reduced biochemical and histological evidence of muscle damage, improved muscle function and increased exercise performance in mdx mice. On the basis of these findings, we propose that sarcoplasmic reticulum Ca2+ leak via RyR1 due to S-nitrosylation of the channel and calstabin-1 depletion contributes to muscle weakness in muscular dystrophy, and that preventing the RyR1-mediated sarcoplasmic reticulum Ca2+ leak may provide a new therapeutic approach.
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Cites
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Ryanodine receptor oxidation causes intracellular calcium leak and muscle weakness in aging
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Self-citationThioredoxin and Thioredoxin Reductase in Relation to Reversible S -Nitrosylation
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Redox Characterization of Functioning Skeletal Muscle
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Metadata
- Authors
- Bellinger, A. M., Reiken, S., Carlson, C., Mongillo, M., Liu, X., Rothman, L., Matecki, S., Lacampagne, A., & Marks, A. R.
- Venue
- Nature Medicine
- Published
- 2009-02-08
- Volume
- 15
- Issue
- 3
- Pages
- 325-330
- ISSN
- 1078-8956 (ISSN-L)
- 1546-170X
- OpenAlex
- W2003414258
- Cited by
- 531
- References
- 2
- FWCI
- 15.24
- Type
- journal article
- Language
- en
- Open access
- green
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