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Morphological studies of bone and tendon.
S B Doty1, E R Morey-Holton, G N Durnova
1Electron Microscopy Laboratory, Hospital for Special Surgery, New York, New York 10021.
Journal of Applied Physiology (Bethesda, Md. : 1985)
|August 1, 1992
Summary
Spaceflight on COSMOS 2044 caused minor bone cell changes and tendon disorganization in rats. While some spaceflight effects were observed, they were less pronounced than in previous missions.
Area of Science:
- Space biology
- Skeletal physiology
- Biomaterials science
Background:
- Previous studies on COSMOS 1887 investigated spaceflight effects on animal biology.
- Understanding microgravity's impact on bone and connective tissues is crucial for human space exploration.
Purpose of the Study:
- To assess skeletal tissue and tendon changes in rats flown on the COSMOS 2044 biosatellite.
- To compare findings with previous spaceflight studies, specifically COSMOS 1887.
Main Methods:
- Utilized light and electron microscopy, histochemistry, and morphometric techniques.
- Focused analysis on bone cells and vasculature of the tibia and tendons of metatarsal bones.
- Employed a combination of microscopy and histochemical methods for detailed cellular analysis.
Main Results:
- Electron microscopy revealed vascular inclusions in bone samples from flight animals.
- A slight, non-statistically significant reduction in endosteal osteoblast activity was observed.
- Spaceflight induced collagen fibril disorganization in metatarsal tendons.
- Vascular changes in the periosteal region were not evident with light microscopy or histochemistry.
Conclusions:
- Skeletal and tendon changes consistent with spaceflight were present on COSMOS 2044.
- The observed spaceflight-induced alterations were less evident compared to COSMOS 1887.
- Further research is needed to fully elucidate the mechanisms and extent of spaceflight's impact on musculoskeletal tissues.