How might one immune receptor contribute to aging across multiple organs?

News summary

ScienceDaily described the finding as an immune 'switch.' The Science paper shows that with aging, tissue-resident macrophages become less effective at clearing senescent neutrophils. In aged mice, reducing EP2 signaling in these macrophages improved clearance and was associated with lower inflammation and more youthful function across several organs. Elevated EP2 and senescent neutrophils were also observed in aged or diseased human tissues.

Reducing EP2 signaling in tissue-resident macrophages of aged mice preserved mitochondrial fitness and improved measures related to frailty, sarcopenia, adiposity, cardiac impairment, inflammation, and cognitive decline. Pharmacologic EP2 inhibition also restored clearance of senescent neutrophils.

The study identifies an intriguing pathway linking chronic inflammation and aging, but it is not yet an anti-aging treatment for people. Turning EP2 inhibition into a safe therapy would require careful study of its roles in normal immunity, infection, and other physiological processes.

The intervention evidence comes mainly from mice. Observing related changes in human tissue is important, but it does not show that EP2 inhibition will produce the same multi-organ benefits or be safe in people.