Longevity & AgingKey Membrane Lipid Decline Drives Mitochondrial Aging in Worms and Possibly Humans
Researchers at the Leibniz Institute on Aging discovered that phosphatidylcholine, the most abundant lipid in mitochondrial membranes, steadily declines with age in C. elegans worms. This decline fragments the mitochondrial network, reducing energy efficiency. The key enzyme driving this is SAMS-1, which produces a molecule needed to synthesize phosphatidylcholine. Unusually long-lived worm mutants maintained SAMS-1 levels despite having impaired mitochondria. When researchers supplemented phosphatidylcholine directly, it reversed mitochondrial fragmentation in lab experiments. The findings suggest that supporting mitochondrial membrane integrity — not just mitochondrial function itself — could be a meaningful target for slowing age-related energy decline in humans.
