Ageing is often associated with declining mitochondrial function—but this study made me look at the problem from a different angle: what if the trigger is not only inside the mitochondria, but also in the membrane surrounding it?
A recent study in Nature Communications used proteomics, lipidomics, genetics, transcriptomics and metabolomics to study natural mitochondrial aging. The researchers found that a gradual decrease in phosphatidylcholine (PC) synthesis was an important contributor to mitochondrial network disruption.
What really impressed me was the fact that different layers of biological data all pointed to the same pathway. Reduced levels of SAMS-1, PMT-1 and PMT-2, components involved in SAM-dependent PC synthesis, were associated with aging in C. elegans. Inhibition of this pathway resulted in mitochondrial fragmentation and decreased respiration, which could be partially rescued by supplementation of PC or choline. Even more interestingly, analysis of GTEx data showed age-associated reduction of the human PC-synthesis analogue PEMT in several tissues.
The exciting question for me now is whether the computational integration of multi-omics datasets, lipid-protein networks and mitochondrial phenotypes can identify further metabolic nodes that are targetable therapeutically.
The study doesn’t establish choline or PC supplementation as an anti-aging therapy in humans—the human findings are largely correlational—but it opens an intriguing direction for future research.
Have better look via this research paper link: Aging-associated decline of phosphatidylcholine synthesis is a malleable trigger of natural mitochondrial aging | Nature Communications
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MBH/PS