title: TRPM8-expressing dorsal root ganglion neurons project dichotomizing axons to both skin and bladder in rats.
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.
authors.affiliation: Department of Neurobiology and Anatomy, Nagoya City University Graduate School of Medical Sciences, Mizuho-ku, Nagoya, Japan.
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Shibata
authors.forename: Shinya
authors.initials: S
authors.lastname: Ugawa
authors.forename: Makoto
authors.initials: M
authors.lastname: Imura
authors.forename: Yasue
authors.initials: Y
authors.lastname: Kubota
authors.forename: Takashi
authors.initials: T
authors.lastname: Ueda
authors.forename: Yoshiyuki
authors.initials: Y
authors.lastname: Kojima
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Ishida
authors.forename: Shoichi
authors.initials: S
authors.lastname: Sasaki
authors.forename: Yutaro
authors.initials: Y
authors.lastname: Hayashi
authors.forename: Kenjiro
authors.initials: K
authors.lastname: Kohri
authors.forename: Shoichi
authors.initials: S
authors.lastname: Shimada
mesh_terms: D000818:Animals; D004594:Electrophysiology; D005727:Ganglia, Spinal / Q000378:metabolism*; D008297:Male; D056325:Neuronal Tract-Tracers; D009474:Neurons / Q000378:metabolism*; D051381:Rats; D017207:Rats, Sprague-Dawley; D012867:Skin / Q000294:innervation*; D050053:TRPM Cation Channels / Q000235:genetics / Q000378:metabolism*; D001743:Urinary Bladder / Q000294:innervation*
chemical_list: D056325:Neuronal Tract-Tracers; D050053:TRPM Cation Channels; C498947:Trpm8 protein, rat