In women with BRCA1/2 mutations, certain fatty acids produced by gut bacteria are more strongly linked to lower levels of markers indicating gut barrier disruption than omega-3 fatty acids from diet.
Mechanism
Synthesis from 1 study
Gut bacteria make chemicals from fiber that strongly help seal the gut lining, keeping harmful substances from leaking into the blood. Fish oil helps too, but not as much. The bacteria’s chemicals are the main reason the gut stays intact in these women.
Most probable mechanism
Good bacteria in the gut break down fiber to produce short-chain fatty acids like propionate and butyrate, which help seal the gaps between gut lining cells. This prevents harmful bacterial parts from leaking into the blood, which lowers markers of gut damage. While omega-3 fats from food also help seal these gaps, they are not as effective as the chemicals made by gut bacteria.
Fecal short-chain fatty acids, particularly propionate and butyrate, are absorbed by intestinal epithelial cells and activate signaling pathways that upregulate the expression of tight junction proteins.
Increased expression of tight junction proteins, including occludin and zonula occludens-1, enhances the structural integrity of the intestinal epithelial barrier.
A more intact epithelial barrier reduces paracellular leakage of bacterial lipopolysaccharide into the bloodstream.
Reduced systemic exposure to bacterial lipopolysaccharide lowers the concentration of lipopolysaccharide-binding protein and fecal zonulin, biomarkers of barrier dysfunction.
Plasma docosahexaenoic acid incorporates into epithelial cell membranes and modestly stabilizes tight junction proteins, but its effect on barrier integrity is weaker than that of microbial short-chain fatty acids.
Evidence from Studies
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