NEW research has identified the elongation of lipid chains as a conserved hallmark of ageing across mice, Caenorhabditis elegans, fruit flies and humans, suggesting that changes in lipid composition could offer new insights into lifespan and age-related decline.
The study, published in Nature Aging, used multi-tissue lipidomics across species to investigate how lipids change with age. Lipids are essential for cell membranes, signalling and energy storage, but how their composition is remodelled during ageing has remained unclear.
The researchers found that ageing was characterised by a shift towards longer lipid chains alongside a depletion of shorter lipid species. This pattern suggests that ageing involves a change in the balance between lipid lengths, rather than simply an overall increase in lipid size.
Similar lipid lengthening was observed during the progression of human heart disease. In mice, dietary restriction was associated with shorter lipids in the heart, indicating that lipid composition may also respond to interventions linked to metabolic health.
The team identified Plb1, a lipid-remodelling factor, as a potential regulator of these changes. Its expression correlated with lifespan in mice, while genetic analyses supported a relationship between Plb1 and human frailty.
Further experiments in C. elegans found that reducing Plb1 expression reversed lipid elongation and extended lifespan. The lifespan effect depended on lipid length, supporting a functional link between lipid remodelling and longevity in this model organism.
These findings suggest that lipid chain length is not merely a marker that changes alongside ageing. In worms, manipulating the process altered both lipid composition and lifespan, providing evidence that the pathway may influence longevity.
The cross-species findings establish lipid chain length remodelling as a potentially actionable feature of ageing. The association with human frailty and heart disease also raises questions about whether similar mechanisms contribute to age-related decline in people.
However, the lifespan-extending effects of Plb1 knockdown were demonstrated in C. elegans. The findings do not establish that manipulating Plb1 or shortening lipid chains would extend human lifespan.
Further research will be needed to clarify how this remodelling process affects different tissues and whether targeting it could eventually inform interventions for age-related disease. The study provides a potential direction for investigating the molecular mechanisms connecting lipid metabolism, ageing and longevity.
Reference
Li W et al. Longer lipids mark aging and constrain lifespan. Nat Aging. 2026. [Epub ahead of print].
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