Excessive Mitochondrial Point Mutations Do Not Lead to Obvious Metabolic Dysfunction

We examined specific aspects of metabolism in male PolG+/mut mice at 6 and 12 months of age under three dietary conditions: normal chow (NC) feeding, high-fat feeding (HFD), and 24-hr starvation. We performed mitochondrial proteomics and assessed dynamics and quality control signaling in muscle and liver to determine whether mitochondria respond to mtDNA point mutations by altering morphology and turnover. In the current study, we observed that the accumulation of mtDNA point mutations failed to disrupt metabolic homeostasis and insulin action in male mice, but with aging, metabolic health was likely preserved by countermeasures against oxidative stress and compensation by the mitochondrial proteome.
Source: Fight Aging! - Category: Research Authors: Tags: Medicine, Biotech, Research Source Type: blogs