Scientists discover a hidden switch that shuts down inflammation: Science Daily

Mij

Senior Member (Voting Rights)
Researchers at University College London (UCL) have identified a biological mechanism that helps the body bring inflammation to an end, a finding that could eventually lead to new treatments for chronic inflammatory diseases affecting millions of people.

Date: September 12, 2026

Source: University College London

Summary: Scientists have uncovered a natural braking system that helps the immune system switch off inflammation and prevent harmful immune cells from building up. Boosting this pathway in people reduced inflammation-related immune changes and sped up pain relief, pointing toward potential new treatments for chronic inflammatory diseases.

A Natural Brake on the Immune System

"The new study, published in Nature Communications, points to a group of small fat-derived molecules called epoxy-oxylipins as part of that shutdown process.

According to the researchers, these molecules act like natural brakes on the immune system. They help prevent excessive growth of intermediate monocytes,* a type of white blood cell that can support healing in the short term but may contribute to chronic inflammation if too many accumulate or remain active for too long.

To study the process directly in people, the researchers gave healthy volunteers a tiny injection of UV-killed E. coli bacteria in the forearm. Because the bacteria were no longer alive, they could not cause an infection, but they still triggered a temporary inflammatory response.


That reaction produced the familiar signs of inflammation, including pain, redness, heat, and swelling, similar to what can happen after an injury or infection."

Study:
Epoxy-oxylipins direct monocyte fate in inflammatory resolution in humans
 
Epoxy-oxylipins direct monocyte fate in inflammatory resolution in humans, 2026, Bracken et al.

Bracken, Olivia V.; Jalali, Parinaaz; Glanville, James R. W.; Benvenutti, Larrissa; Chambers, Emma S.; Trahair, Hugh; Motwani, Madhur; Feehan, Karen T.; Evans, Jamie G.; Carvalho, Jhonatan de Souza; De Maeyer, Roel P. H.; Akbar, Arne N.; Lih, Fred B.; Zeldin, Darryl C.; Bishop-Bailey, David; Edin, Matthew L.; Gilroy, Derek W.

Abstract
The role of cytochrome P450-derived epoxy-oxylipins and their metabolites in human inflammation and resolution is unknown.
We report that epoxy-oxylipins are present in blood of healthy, male volunteers at baseline and following intradermal injection of UV-killed Escherichia coli , an experimental model of acute resolving inflammation.
At the site of inflammation, cytochrome P450s and epoxide hydrolase (EH) isoforms, which catabolise oxylipins to corresponding diols, are differentially upregulated throughout the inflammatory response, as is the biosynthesis of epoxy-oxylipins.
GSK2256294, a selective sEH inhibitor specifically elevates 12,13-EpOME and 14,15-EET.
While inhibition of sEH hastens pain resolution, it has no effect on tissue heat, redness and swelling.
GSK2256294, however, significantly reduces numbers of circulating intermediate monocytes that expand during inflammation.
We find that 12,13-EpOME blocks the transition of classical to intermediate monocytes in a p38 MAPK-dependent manner, results that are recapitulated when blocking p38 MAPK in vitro and when administering the p38 MAPK inhibitor losmapimod in vivo to healthy volunteers.
Furthermore, fewer intermediate monocytes are observed at the site of inflammation, accompanied by reduced tissue CD4 T cells.
Hence, we have mapped the expression, activity and function of epoxy-oxylipins in human inflammation revealing new mechanisms of monocyte differentiation and resolution biology.

Web | DOI | PMC | PDF | Nature Communications | Open Access
 
This story has been going a long time. I am afraid I don't see it being relevant to chronic inflammatory disease, where we know that the inflammation goes on because the stimulus is still present. Take away the stimulus and there is no need to switch anything off. It does that on its own.
 
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