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[The cell as a gravity-dependent biomechanic system]
Aviakosmicheskaia I Ekologicheskaia Meditsina = Aerospace and Environmental Medicine
|May 29, 2000
Summary
Altered gravity affects cell structure and function, revealing cellular mechanisms for sensing gravity. Microgravity can hinder cell adhesion, while hypergravity slows growth, challenging previous biological assumptions.
Area of Science:
- Biophysics
- Cell Biology
- Gravitational Biology
Context:
- Studies explored cellular responses to altered gravity (0.00001-5 g) from 1995-1997.
- Experiments utilized clinostats, centrifuges, and spaceflight to simulate hypo-, hyper-, and microgravity.
- Fibroblast and osteoblast cell cultures served as models for investigating gravity's effects.
Purpose:
- To investigate the morphophysiological changes in cells under varied gravitational conditions.
- To identify cellular mechanisms responsible for gravitational sensitivity.
- To re-evaluate the relationship between organism size/mass and gravitational sensitivity.
Summary:
- Altered gravity vectors modified cell structure, including spatial organization and morphology.
- Functional activity, such as energy expenditure and metabolism, was altered by gravity changes.
- Microgravity in spaceflight inhibited cell growth, division, and migration, primarily due to reduced substrate adhesion.
- Hypergravity decelerated cell growth and biomass gain.
Impact:
- Findings suggest inherent mechanisms for gravitational sensitivity at the cellular level.
- The study corrects a fundamental postulate in gravitational biology regarding size and sensitivity.
- Results provide insights into cellular biomechanics and the role of intracellular components in gravity perception.