Calorie Restriction as a Way to Slow Harmful Age-Related Changes in the Gut Microbiome

In this study, we investigated the effect of long-term 30% CR compared with ad libitum (AL) feeding on the microbiome in aging. We studied the Tg2576 model, where a mutant variant of the human APP is expressed in transgenic mice. This transgene results in cerebral amyloid accumulation, synaptic loss, and cognitive impairment by 12 months of age. We found that female Tg2576 mice have more substantial age-related microbiome changes compared to wildtype (WT) mice, including an increase in Bacteroides, which were normalized by CR. Specific gut microbiota changes were linked to Aβ levels, with greater effects in females than in males. In the gut, Tg2576 female mice had an enhanced intestinal inflammatory transcriptional profile, which was reversed by CR. Furthermore, we demonstrate that Bacteroides colonization exacerbates Aβ deposition, which may be a mechanism whereby the gut impacts AD pathogenesis. These results suggest that long-term CR may alter the gut environment and prevent the expansion of microbes that contribute to age-related cognitive decline.
Source: Fight Aging! - Category: Research Authors: Tags: Medicine, Biotech, Research Source Type: blogs