Referenced in: none

Automatically associated channels: TRP , TRPM , TRPM8

Title: TRPM8-expressing dorsal root ganglion neurons project dichotomizing axons to both skin and bladder in rats.

Authors: Yasuhiro Shibata, Shinya Ugawa, Makoto Imura, Yasue Kubota, Takashi Ueda, Yoshiyuki Kojima, Yusuke Ishida, Shoichi Sasaki, Yutaro Hayashi, Kenjiro Kohri, Shoichi Shimada

Journal, date & volume: Neuroreport, 2011 Jan 26 , 22, 61-7

PubMed link: http://www.ncbi.nlm.nih.gov/pubmed/21150802

Abstract
To reveal the mechanism of urinary urgency evoked by cold sensation, we investigated the convergence of the primary sensory afferents of the skin and bladder. Dichotomizing afferents of L6-S1 dorsal root ganglion neurons that innervate the skin and bladder was constantly observed with retrograde neuron tracers in rats. In-situ hybridization revealed that approximately 8.0% of the double-labelled cells expressed transient receptor potential channel melastatin member 8 (TRPM8) transcripts in the dorsal root ganglions. Cold and menthol stimuli to the skin generated bladder nerve responses conducted through dichotomizing axons, which significantly decreased in the presence of the TRPM8 blocker BCTC. Taken together, TRPM8-expressing sensory neurons with dichotomizing axons projecting to the skin and bladder may be responsible for the urinary urgency evoked by cold sensation.