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Updated: May 6, 2026

Quantitative Magnetic Resonance Imaging of Skeletal Muscle Disease
Published on: December 18, 2016
A SNO storm in skeletal muscle
Jonathan S Stamler1, Qi-An Sun, Douglas T Hess
1Department of Medicine, Duke University Medical Center, Durham, NC 27710, USA. staml001@mc.duke.edu
Hyper-S-nitrosylation of the ryanodine receptor calcium release channel (RyR1) in skeletal muscle disrupts calcium flow. This finding explains muscle dysfunction in strenuous exercise and congenital disorders like malignant hyperthermia.
Area of Science:
- Biochemistry
- Molecular Biology
- Physiology
Background:
- Dysregulated S-nitrosylation is implicated in various human diseases, but its specific role remains unclear.
- S-nitrosylation is a post-translational modification involving the addition of a nitric oxide group to cysteine residues.
Discussion:
- Two recent studies reveal that excessive S-nitrosylation of the skeletal muscle ryanodine receptor calcium release channel (RyR1) impairs calcium ion flux.
- This disruption in calcium handling is a key factor in skeletal muscle contractility issues and damage observed during intense physical activity.
Key Insights:
- Hyper-S-nitrosylation of RyR1 directly impacts skeletal muscle function by altering calcium release.
- This mechanism provides a molecular explanation for muscle pathologies, including malignant hyperthermia and exercise-induced muscle damage.
Outlook:
- Further research into S-nitrosylation pathways could identify novel therapeutic targets for muscle disorders.
- Understanding RyR1 regulation offers potential strategies for managing conditions characterized by impaired muscle contractility.
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