JOURNAL ARTICLE
RESEARCH SUPPORT, N.I.H., EXTRAMURAL
RESEARCH SUPPORT, U.S. GOV'T, P.H.S.
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Expression of the vanilloid receptor TRPV1 in rat dorsal root ganglion neurons supports different roles of the receptor in visceral and cutaneous afferents.

Brain Research 2005 June 22
A combination of tracing and multiple color immunofluorescence revealed that 69% of rat dorsal root ganglion (DRG) neurons innervating the urinary bladder expressed the vanilloid receptor TRPV1. In contrast, only 32% of DRG neurons innervating the skin of the L6 dermatome expressed TRPV1. However, a similar fraction of visceral (60-62%) and of cutaneous (59-60%) TRPV1-positive DRG neurons expressed the peptidergic markers substance P and calcitonin gene-related peptide, while the fraction of TRPV1-positive neurons that was labeled by the non-peptidergic marker Isolectin B4 was 58% for cutaneous and only 24% for visceral afferents. These results underscore differences of expression of functional markers in visceral and cutaneous afferents and support different mechanisms of activation of TRPV1 in viscera and in skin.

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