Summary
A bioRxiv preprint identifies the nuclear enzyme MSK1 as a regulator of TRPV1 expression in a specific subset of pain-sensing neurons. In experimental models, blocking this inflammatory pathway reduced heat hypersensitivity while preserving acute heat sensation and body-temperature control.
A bioRxiv preprint reports that inflammatory burning pain and increased sensitivity to heat depend on MSK1 activity in a specific subset of nociceptors, the sensory neurons that detect potentially harmful stimuli. The researchers found that inflammation increases MSK1 activity and that the enzyme regulates expression of TRPV1 in nociceptors carrying both proteins.
The study included mouse and human nociceptors for examining this MSK1–TRPV1 relationship. In the experimental pain model described in the abstract, inhibiting inflammation-driven MSK1 activity protected against heat hypersensitivity. The intervention was reported to leave two other TRPV1-related functions intact: detecting acute painful heat and helping maintain the body’s core temperature.
The work is presented as a bioRxiv preprint posted on September 21, 2026, rather than as a peer-reviewed clinical study.
How the proposed pain pathway works
Nociceptors are specialised nerve cells that convert potentially damaging heat, chemicals or mechanical forces into electrical signals carried to the nervous system. TRPV1 is one of the molecular sensors involved in detecting noxious heat. Its activity contributes to the immediate sensation of painful heat, but increased TRPV1 signalling can also contribute to heat hyperalgesia—the state in which ordinarily painful heat feels more intense after injury or inflammation.
The preprint places MSK1 within the inflammatory process that increases this sensitivity. MSK1 is a nuclear enzyme, meaning that it operates in the cell nucleus, where it can influence the activity of proteins involved in gene regulation. According to the researchers, inflammation activates and increases MSK1 in the relevant nociceptors, and MSK1 then governs TRPV1 expression in cells where the two proteins are co-expressed.
This suggests a distinction between the machinery needed to detect an acute heat stimulus and the inflammatory increase in sensitivity that follows tissue injury. Targeting the latter pathway could, in principle, reduce inflammation-related heat hypersensitivity without eliminating normal protective heat detection.
Why the finding matters
The result provides a cell-specific mechanism for inflammatory heat pain rather than treating all TRPV1-expressing sensory neurons as functionally identical. That distinction may help explain why inflammation can amplify burning pain while the nervous system continues to use heat sensation for immediate protection and temperature regulation.
The findings are mechanistic and preclinical. The source describes molecular observations in mouse and human nociceptors and protection from heat hypersensitivity in an experimental system; it does not describe a treatment tested in people. Further work would be needed to determine whether selectively inhibiting MSK1 can be achieved safely and whether the mechanism can lead to a useful therapy for inflammatory pain.