Impact of Environmental Factors on Gut Microbial Community During Spaceflight

The Role of Gut Microbiota in Human Health

The human intestinal tract hosts a diverse and intricate microbial community that is vital for maintaining health. Research estimates that the gut contains at least 1,000 different bacterial species, possessing a genetic diversity that exceeds that of the human genome by 100 times. These gut bacteria significantly influence health by aiding in food digestion, ensuring optimal digestive function, and serving as a barrier in the immune system.

Risks Posed by Spaceflight Conditions

Certain environmental factors associated with space, such as microgravity and radiation, may disrupt the gut microbiota, posing risks to astronaut health, particularly during extended missions.

Research Methodology and Findings

A recent study published in the journal Microbiome by researchers from Northwestern University and the University of Illinois at Chicago introduced a new analytical tool named Starmaps. This tool was employed to compare microbiome samples from mice after a 37-day spaceflight aboard the International Space Station with other relevant datasets.

To analyze the changes in gut microbial diversity and community structure due to spaceflight, the research team evaluated the number and evenness of species in the samples. The findings emphasized that habitat significantly influenced the mice’s microbiota, including factors such as gas composition, temperature, and diet.

Using the Starmaps tool, the research team discovered that radiation exposure and microgravity impact the gut microbiome of mice, suggesting potential larger implications for human astronauts.

Significance of Understanding Microbiome Changes

Gaining insights into the factors that lead to alterations in the microbiome is crucial for mitigating health risks to astronauts during prolonged human space missions.

Reference

Jiang, P. et al. Reproducible changes in the gut microbiome suggest a shift in microbial and host metabolism during spaceflight. Microbiome, 2019;7:113. DOI: 10.1186/s40168-019-0724-4

Image Credit

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