Impact of Microgravity on Intestinal Epithelial Barrier in Astronauts

Importance of the Intestinal Barrier

The intestine plays a crucial role in the digestive system and is home to a vast number of microorganisms. Intestinal epithelial cells are vital for maintaining the symbiotic relationship between gut microbiota and the host. They facilitate nutrient absorption while preventing harmful substances from entering the body. Preserving the integrity of the intestinal barrier is essential for overall health, as dysfunction in this barrier can lead to various diseases, including gastrointestinal infections, inflammatory bowel diseases, obesity, celiac disease, and food allergies.

Research Findings on Microgravity Effects

A recent study published in *Scientific Reports* by Nature, led by researchers from the University of California, explored how microgravity during spaceflight affects epithelial barrier function. The study utilized a rotating wall vessel to simulate a near-weightless environment and examine cultured intestinal epithelial cells.

Results of the Study

After approximately two weeks of culture in the vessel, the research team observed that the intestinal epithelial cells experienced a significant delay in forming cell-to-cell junctions. These junctions are essential for blocking the passage of living organisms or biological molecules. Remarkably, this effect persisted for an additional two weeks even after the cells were removed from the rotating vessel.

Conclusions and Future Research

The findings indicate that the spaceflight environment may induce a lasting susceptibility to epithelial barrier disruption, continuing even after returning to normal gravity conditions. Further research is necessary to assess the extent of this impact on astronauts during space missions.

Author and Reference

Written by Man-tik Choy, Ph.D.
Reference: Alvarez, R., Stork, C.A., Sayoc-Becerra, A. et al. A Simulated Microgravity Environment Causes a Sustained Defect in Epithelial Barrier Function. Sci Rep 9, 17531 (2019) doi:10.1038/s41598-019-53862-3.
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