Investigation Of intestinal Mucosal Barrier Functions To Simulated Weightlessness
Researchers examined the responses of intestinal mucosal barrier functions to simulated weightlessness, by using the hindlimb unloading rats model. Exposure to microgravity or weightlessness leads to various adaptive and pathophysiological alterations in digestive structures and physiology.
Compared with normal controls, simulated weightlessness damaged the intestinal villi and structural integrity of tight junctions, up-regulated the expression of pro-apoptotic protein Bax while down-regulated the expression of anti-apoptotic protein Bcl-2, thus improved the intestinal permeability. It could also influence intestinal microbiota composition with the expansion of Bacteroidetes and a decrease of Firmicutes.