A longevity gene variant calms chronic inflammation

People who live long and healthy lives more often carry a specific version of the gene BPIFB4. Researchers noticed this because older populations possess this variant more frequently than younger ones, suggesting that those without it face a slightly higher mortality risk. Earlier work already showed that this variant slows arterial aging and reduces the low-level chronic inflammation (inflammaging) that quietly accelerates with age and contributes to cardiovascular disease, dementia, and other conditions.

Platelets as immune gatekeepers

But how exactly does BPIFB4 achieve this? The researchers found that the gene reshapes the immune profile of platelets. Platelets are small cell fragments best known for driving blood clotting, but they also participate actively in cell-to-cell signaling. Carriers of the protective BPIFB4 variant display higher levels of the CD47 protein on their platelets. CD47 acts as a ‘don’t-eat-me’ signal: cells displaying abundant CD47 are less likely to be flagged and cleared by the immune system, which dampens unnecessary immune activation.

The researchers observed the same pattern in centenarians: a higher proportion of newly formed platelets (reticulated platelets) carrying CD47 on their surface. The BPIFB4 variant appears to program this CD47 profile early during platelet production, already within the precursor cell (megakaryocyte) from which platelets arise.

A target for future drugs

This is preliminary research, but it offers a concrete lead. If CD47 levels on platelets are the key, it may be possible to develop a drug that mimics the effect, without needing to inherit the beneficial gene variant. Mouse studies have also shown that the BPIFB4 protein retains its effects when administered orally, which improves the prospects for a practical therapeutic.

From a longevity perspective, this is notable: it suggests that immune regulation via platelets is an underappreciated link in the aging process. The study does not conclusively prove this, but the direction is promising enough to warrant further investigation.

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