The body's warmth sensor is secretly a pain switch—blocking it may ease arthritis
· Medical Xpressedited by Lisa Lock, reviewed by Robert Egan
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Chronic pain, including arthritis pain, affects more than one-third of U.K. adults. Current painkillers such as methotrexate and nonsteroidal anti-inflammatory drugs (NSAIDs) work by damping down the immune system, which is overproducing inflammatory agents that cause pain, but relief is often short-lived and incomplete, and they can leave patients more vulnerable to infection.
Researchers at Warwick's School of Life Sciences have found an alternative target for alleviating chronic pain—a channel called TRPM2. TRPM2 was previously known mainly as a "warmth sensor" on sensory nerve endings, helping the body detect mild, nonpainful warmth.
In the new work published in the Proceedings of the National Academy of Sciences, the team discovered that TRPM2 has a second, more troubling job. They found that TRPM2 on sensory nerves is also a pain generator. Prostaglandin E2, a chemical released during inflammation, and autoantibodies, immune proteins produced by the body's own immune cells, both act directly on TRPM2 to switch on pain signals in nerve cells.
"We found that TRPM2 works like a convergent pain switch, taking very different immune and inflammatory signals and converting them into the electrical impulses that the brain reads as pain," said lead author Dr. Xuming Zhang of the University of Warwick's School of Life Sciences. "These signals also switch TRPM2 on through completely unexpected routes, bypassing the cell's usual signaling pathways entirely."
As a demonstration of its role in pain, mouse models with TRPM2 removed from nerve cells showed that pain caused by prostaglandin E2 and autoantibodies was completely prevented. Chronic arthritis pain and nerve injury pain were also substantially reduced, even though the underlying immune and inflammatory response carried on largely as normal. This suggests TRPM2 is a separate, direct route to pain, working alongside inflammation rather than being caused by it.
Most strikingly, blocking TRPM2 with a drug injected into the joint completely reversed arthritis pain in mice, and the relief lasted two days after a single dose, without dampening the joint inflammation itself.
Zhang continued, "What surprised us most was how completely and how long TRPM2 blockade relieved chronic arthritis pain. That points to TRPM2 as a genuinely promising drug target for treating chronic pain more effectively than current options allow."
The findings also raise an intriguing biological puzzle: How does a protein built to detect harmless warmth end up driving some of the body's most stubborn pain? Zhang's team suggests different populations of TRPM2-carrying nerve cells may be responsible for each job, a question they hope to explore next.
Publication details
Linda Varghese et al, TRPM2 is a direct pain transducer, Proceedings of the National Academy of Sciences (2026). DOI: 10.1073/pnas.2532289123
Journal information: Proceedings of the National Academy of Sciences
Key medical concepts
Prostaglandin E2Autoantibodies
Clinical categories
RheumatologyNeurologyClinical pharmacologyCommon illnesses & Prevention Provided by University of Warwick Who's behind this story?
Lisa Lock
BA art history, MA material culture. Former museum editor, paramedic, and transplant coordinator. Editing for Science X since 2021. Full profile →
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