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Brain Res. 2001 Jan 26;890(1):184-8.

VR1-immunoreactive primary sensory neurons in the rat trigeminal ganglion.

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  • 1Second Department of Oral Anatomy and Biodental Research Center, Okayama University Dental School, 2-5-1 Shikata-cho, Okayama 700-8525, Japan.


Immunohistochemistry for VR1, a nociceptive transducer for vanilloid compounds, protons and heat (>43 degrees C), was performed on the rat trigeminal ganglion (TG). The immunoreactivity (IR) was detected in 20% of TG cells and these neurons were mostly small- to medium-sized (mean+/-S.D. 427+/-189 microm(2)). Twenty-six percent of the TG neurons retrogradely labeled from the facial skin exhibited VR1-IR, while the IR was detected in only 8% of those labeled from the tooth pulp. Co-expression of VR1 was common among the calcitonin gene-related peptide-immunoreactive cutaneous neurons (63%) but not among the similar tooth pulp neurons (20%). The present study indicates that primary nociceptive neurons which respond to vanilloid compounds, protons and heat are abundant in the facial skin but not in the tooth pulp.

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