Variability in capsaicin-stimulated calcitonin gene-related peptide release from human dental pulp

Lorel E. Burns, Austin A. Ramsey, Joshua J. Emrick, Malvin N. Janal, Jennifer L. Gibbs

Research output: Contribution to journalArticlepeer-review

Abstract

Introduction The unique innervation and anatomic features of dental pulp contribute to the remarkable finding that any physical stimulation of pulpal tissue is painful. Furthermore, when pathological processes such as caries affect teeth and produce inflammation of the pulp, the pain experienced can be quite intense and debilitating. To better understand these underlying neurobiological mechanisms and identify novel analgesic targets for pulpally derived pain, we have developed a powerful ex vivo model using human tooth slices. Methods Noncarious, freshly extracted teeth were collected and sectioned longitudinally into 1-mm-thick slices containing both dental pulp and the surrounding mineralized tissues. Tooth slices from 36 patients were exposed to 60 μmol/L capsaicin to stimulate the release of calcitonin gene-related peptide (CGRP) from nerve terminals in the pulp. Patient factors were analyzed for their effects on capsaicin-stimulated CGRP release using a mixed model analysis of variance. Results Approximately one third of the variability observed in capsaicin-evoked CGRP release was attributable to differences between individuals. In terms of individual factors, there was no effect of anesthesia type, sex, or age on capsaicin-stimulated CGRP release. Using a within-subject study design, a significant effect of capsaicin on CGRP release was observed. Conclusions Capsaicin-stimulated CGRP release from dental pulp is highly variable between individuals. A within-subject study design improves the variability and maximizes the potential of this powerful translational model to test the efficacy of novel pharmacotherapeutic agents on human peripheral nociceptors.

Original languageEnglish (US)
Pages (from-to)542-546
Number of pages5
JournalJournal of endodontics
Volume42
Issue number4
DOIs
StatePublished - Apr 1 2016

Keywords

  • Calcitonin gene-related peptide
  • TRPV1
  • capsaicin
  • dental pulp
  • human tissue
  • pain
  • primary afferent
  • tooth slice
  • transient receptor potential cation channel V1
  • translational research

ASJC Scopus subject areas

  • Dentistry(all)

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