Related Experiment Video
Updated: Oct 4, 2026
Methods for In situ Quantification of Mitochondrial Morphology in Muscle and Terminal Schwann Cells of Mice
Published on: April 10, 2026
[Effect of tail suspension on mitochondrial Ca2+ and Mg2+ and parameters of electron microscopic morphometry in rats'
Abstract:
Changes of mitochondrial Ca2+, mitochondrial Mg2+ and parameters of electron microscopic morphometry in rats' skeletal muscle after 15 or 30 d tail suspension were observed. The results showed that mitochondrial Ca2+ [correction of Ma2+] mitochondrial Mg2+ increased and morphometry of mitochondrial in skeletal muscle showed that volume density (Vv), surface density (Sv), numerical density (Nv) increased. Mean volume (V) decreased. Specific surface increased in soleus muscle, while that parameter remain unchanged in gastrocnemus musles. It suggests that these changes may be denoted to the decrease of muscular contractive function in simulated weightlessness.
Insights
Simulated weightlessness increased mitochondrial calcium and magnesium in rat skeletal muscle. Mitochondrial structure changed, suggesting reduced muscle contraction function during spaceflight conditions.
Area of Science:
- Mitochondrial physiology
- Skeletal muscle biology
- Spaceflight simulation
Context:
- Tail suspension in rats is a common model for simulating microgravity.
- Understanding cellular adaptations to weightlessness is crucial for astronaut health.
- Mitochondria play a key role in cellular energy metabolism and muscle function.
Purpose:
- To investigate the effects of simulated weightlessness on mitochondrial Ca2+ and Mg2+ levels.
- To analyze changes in mitochondrial morphometry in rat skeletal muscle.
- To correlate these changes with potential alterations in muscle contractive function.
Summary:
- Tail suspension for 15 or 30 days led to increased mitochondrial calcium and magnesium in rat skeletal muscle.
- Electron microscopy revealed increased mitochondrial volume density, surface density, and numerical density.
- Mean mitochondrial volume decreased, while specific surface area increased in soleus muscle but not gastrocnemius.
Impact:
- Findings suggest that altered mitochondrial function and structure contribute to reduced muscle contractility in simulated weightlessness.
- This research provides insights into the cellular mechanisms underlying muscle atrophy during space missions.
- Results may inform strategies to mitigate muscle deconditioning in astronauts.
