Gut miRNA regulates gut microbiome and Alzheimer pathology in App-knock-in mice
Hao, W.; Luo, Q.; Szabo, I. M.; Gasparoni, G.; Tierling, S.; Quan, W.; Chang, H.-F.; Wu, G.; Schulze-hentrich, J.; Liu, Y.
Show abstract
Alzheimers disease (AD) alters the gut microbiome. It remains unclear whether manipulation of miRNA could modulate the gut microbiome and AD pathologies. Depletion of gut miRNA in App-knock-in mice by conditional knockout of Dicer1 gene in intestinal epithelial cells: 1) decreased the absolute number and changed the composition of bacteria in both the gut and brain; 2) reduced cerebral A{beta} load by inhibiting {beta}-secretase activity and increasing the expression of LRP1 and ABCB1 at the blood-brain barrier; 3) increased Il-10 transcription and decreased the transcription of Ccl-2 gene, and that of Ndufa2 and Ndufa5 genes encoding mitochondrial respiratory enzymes in the brain; and 4) induced anxiety symptoms without affecting cognitive function in AD mice. Thus, manipulating miRNA in the gut can modify AD pathogenesis. Future studies should focus on identifying AD-specific miRNAs in the gut that can be therapeutically exploited (e.g. by oral administration) to prevent the progression of AD.
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