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Updated: Jan 16, 2026

Author Spotlight: Mitochondrial Remodeling in Skeletal Muscle
Published on: December 1, 2023
Mitochondrial cardiolipin remodeling facilitates efficient myoblast differentiation
Yohsuke Ohba1, Chinami Fujiwara2, Makoto Arita3
1Division of Physiological Chemistry and Metabolism, Graduate School of Pharmaceutical Sciences, Keio University, Tokyo, Japan; Laboratory for Metabolomics, RIKEN Center for Integrative Medical Sciences (IMS), Yokohama, Kanagawa, Japan.
Mitochondrial cardiolipin remodeling, specifically increasing linoleic acid content, is crucial for efficient myoblast differentiation. This process is essential for muscle cell development and function.
Area of Science:
- Biochemistry
- Cell Biology
- Mitochondrial Biology
Background:
- Mitochondria undergo significant changes during myoblast differentiation.
- Mitochondrial membrane lipids are vital for mitochondrial integrity.
- The role of mitochondrial lipid composition in myoblast differentiation is not well understood.
Purpose of the Study:
- To investigate changes in mitochondrial lipid composition during myoblast differentiation.
- To determine if mitochondrial lipid remodeling influences differentiation efficiency.
Main Methods:
- LC-MS/MS-based untargeted lipidomics on isolated C2C12 murine myoblast mitochondria.
- Analysis of tafazzin expression and MyoD knockdown.
- Assessment of differentiation progression with and without CL biosynthesis/remodeling inhibition and C18:2 supplementation.
- Validation in primary mouse skeletal muscle stem cells.
Main Results:
- The proportion of linoleic acid (C18:2)-containing cardiolipin (CL) increased during early differentiation.
- Tafazzin expression rose with myoblast differentiation.
- CL remodeling was independent of MyoD but essential for differentiation.
- Inhibition of CL biosynthesis/remodeling impaired differentiation, partially rescued by C18:2.
Conclusions:
- Mitochondrial cardiolipin remodeling is a key early event promoting efficient myoblast differentiation.
- Specific CL fatty acid composition, particularly C18:2, is important for muscle development.
- This finding highlights a novel mechanism regulating skeletal muscle differentiation.
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