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Calpains in muscle wasting.
Marc Bartoli1, Isabelle Richard
1Généthon, Centre National de la Recherche Scientifique UMR 8115, 1 bis rue de l'Internationale, 91000 Evry, France.
The International Journal of Biochemistry & Cell Biology
|August 30, 2005
Summary
Calpains, calcium-regulated proteases, are involved in muscle atrophy. Ubiquitous calpains initiate myofibrillar protein degradation, while calpain 3 absence is linked to muscle wasting and dystrophy.
Area of Science:
- Biochemistry
- Cell Biology
- Muscle Physiology
Background:
- Calpains are Ca(2+)-regulated cysteine proteases crucial for cellular processes.
- They play roles in cell differentiation, life, and death through substrate cleavage.
Purpose of the Study:
- To review the role of calpains in muscle atrophy.
- To synthesize current understanding of calpain involvement in muscle wasting.
Main Methods:
- Literature review of calpain function in muscle.
- Analysis of calpain expression and activity in atrophic conditions.
- Examination of genetic mutations affecting calpain function.
Main Results:
- Ubiquitous calpains contribute to myofibrillar protein degradation in muscle atrophy and muscular dystrophies.
- Calpain 3 gene mutations cause limb-girdle muscular dystrophy type 2A.
- Calpain 3 is downregulated in atrophic situations, suggesting its absence is necessary for atrophy.
Conclusions:
- Calpains are key regulators in muscle atrophy.
- Calpain 3 plays a critical, potentially protective, role in muscle homeostasis.
- Calpain activity regulation during exercise and atrophy suggests a role in muscle plasticity and cytoskeletal adaptation.