A specialized population of hair afferents dedicated to transmitting mechanical itch.

Neuron · 11 Nov 2026 · Journal Article

Fatima, Lee + more

The abstract is read at the publisher; the summary is JClub's.

Vellus-like hairs in the postauricular region and hindpaws of mice are innervated by TLR5 Calb1 Aβ-LTMRs, and this pathway is linked to mechanical itch.

Why it matters: Mechanical itch from gentle hair stimulation is poorly explained, especially for atypical depigmented and demedullated hairs with limited skin distribution.
What they did: The study mapped VLH innervation to Aβ LTMRs co-expressing Toll-like receptor 5 and Calbindin1, then used genetic ablation/silencing, optogenetic activation, and Piezo2 mechanotransduction tests.
The result: Removing or silencing these hair afferents eliminated mechanical itch from VLH stroking or indentation under physiological and pathological conditions, while activating them evoked itch behaviors.

AI summary of the abstract · may contain errors · not medical advice · read the paper.

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A specialized population of hair afferents dedicated to transmitting mechanical itch.

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CaMKIIδ-TRPC6 Activates an RyR-BK(Ca) Feedback Axis in Aging Arteries.

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