Scientists discover the brain’s hidden “stop scratching” switch
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- Roberta Gualdani' lab at the University of Louvain identified TRPV4 as a “stop‑scratching” signal in sensory neurons.
- TRPV4 was found specifically in Aβ low‑threshold mechanoreceptors (Aβ‑LTMRs) and in a subset of itch‑related neurons that also express TRPV1.
- Genetically engineered mice lacking TRPV4 only in sensory neurons showed fewer scratching bouts but each bout lasted significantly longer in a chronic‑itch model mimicking atopic dermatitis.
- Calcium imaging and behavioral testing confirmed that the absence of TRPV4 disrupts the normal braking mechanism that tells the brain when scratching is sufficient.
- Biophysical Society presented the findings at its 70th Annual Meeting, highlighting a potential target for treating chronic itch disorders.
Why it matters: Patients with eczema and other chronic itch disorders gain a new therapeutic target, while pharmaceutical firms can develop TRPV4‑modulating drugs to curb relentless scratching and improve quality of life.
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