Increased Chromosome Aberrations in Cells Exposed Simultaneously to Simulated Microgravity and Radiation

Area of Science:

• Space biology and radiation research.
• Cellular and molecular responses to environmental stressors.

Background:

• Space travel presents significant health risks due to space radiation and microgravity (μG).
• The interactive effects of microgravity and radiation on human physiology remain unclear.
• Accurate assessment of health risks for Moon and Mars missions requires more data on combined stressors.

Purpose of the Study:

• To investigate the combined effects of simulated microgravity and space radiation on human cells.
• To quantify chromosome aberrations (CA) under these combined conditions using a novel experimental setup.

Main Methods:

• Development of a synchronized 3D clinostat and carbon-ion/X-ray irradiation system for continuous simulated microgravity.
• Exposure of human fibroblasts to X-rays or carbon ions under simulated microgravity and static conditions.
• Quantification of chromosome aberrations using premature chromosome condensation and 3-color fluorescence in situ hybridization (FISH).

Main Results:

• Cells exposed to irradiation under simulated microgravity exhibited a higher frequency of chromosome aberrations.
• Both simple and complex types of chromosome aberrations were elevated compared to static conditions.
• This effect was observed for both X-ray and carbon-ion radiation.

Conclusions:

• Combined exposure to simulated microgravity and space radiation synergistically increases chromosome damage.
• This finding has critical implications for human health risk assessment in space exploration.
• Further research is needed to understand the underlying molecular mechanisms.