Increased insulin sensitivity and distorted mitochondrial adaptations during muscle unloading.
Zhengtang Qi1, Yuan Zhang, Wei Guo
1Key Laboratory of Adolescent Health Assessment and Exercise Intervention, Ministry of Education, East China Normal University, Shanghai 200241, China. szding@tyxx.ecnu.edu.cn.
Muscle disuse from hindlimb unloading (HU) improves insulin sensitivity and shifts fuel use to glucose. However, it also impairs mitochondrial biogenesis and dynamics, impacting muscle metabolism.
Area of Science:
- Mitochondrial biology
- Muscle physiology
- Metabolic disorders
Background:
- Muscle disuse leads to metabolic dysfunctions.
- Mitochondrial adaptations are crucial in muscle response to unloading.
Purpose of the Study:
- Investigate mitochondrial adaptations to muscle disuse.
- Understand the resulting metabolic changes and their molecular mechanisms.
Main Methods:
- Hindlimb unloading (HU) model in male rats for three weeks.
- Analysis of insulin sensitivity index (ISI), blood metabolites, and skeletal muscle molecular markers.
- Assessment of mitochondrial function, biogenesis, and dynamics.
Main Results:
- HU increased ISI and decreased triglyceride and insulin levels.
- Skeletal muscle showed decreased pyruvate dehydrogenase kinase 4 (PDK4) expression and mitochondrial protein levels.
- HU reduced mitochondrial DNA (mtDNA) content, mitochondrial biogenesis markers, mitochondrial Dynamin-related protein 1 (Drp1), and Mfn2 mRNA levels.
Conclusions:
- Muscle disuse induces significant mitochondrial adaptations.
- These adaptations include a shift towards glucose utilization and impaired mitochondrial biogenesis.
- Altered mitochondrial dynamics are observed, contributing to metabolic changes.
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