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Tissue pH and temperature regulate pulpal nociceptors.

H E Goodis1, A Poon, K M Hargreaves

  • 1Division of Endodontics, Department of Preventive and Restorative Sciences, UCSF, 707 Parnasssus Ave., San Francisco, CA 94143, USA. harold.goodis@ucsf.edu

Journal of Dental Research
|October 26, 2006
PubMed
Summary
This summary is machine-generated.

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Cooling dental pulp or lowering its pH significantly impacts capsaicin receptor activity and calcitonin gene-related peptide (CGRP) release. These findings suggest environmental factors influence dental pain signaling.

Area of Science:

  • Neuroscience
  • Physiology
  • Pain Research

Background:

  • The Transient Receptor Potential Vanilloid 1 (TRPV1) receptor is a key sensor for environmental stimuli like temperature and pH.
  • TRPV1 is expressed in nociceptors, suggesting its role in pain perception.
  • Inflammation can alter tissue pH and temperature, potentially modulating TRPV1 activity.

Purpose of the Study:

  • To investigate if capsaicin receptors in rat dental pulp are activated by changes in tissue temperature and pH.
  • To determine the effect of altered pH and temperature on capsaicin-induced neuropeptide release, specifically calcitonin gene-related peptide (CGRP).

Main Methods:

  • Isolated superfused rat dental pulp was used to measure neuropeptide release.
  • Capsaicin was applied to the pulp under varying conditions of pH and temperature.

Related Experiment Videos

  • Release of immunoreactive CGRP was quantified to assess neuronal activation.

    • Main Results:

    • Increased proton concentration (lower pH) significantly enhanced capsaicin-induced CGRP release, nearly doubling the peak release compared to pH 7.4.
    • Reducing tissue temperature from 37°C to 26°C completely inhibited the capsaicin-induced CGRP release.
    • These results demonstrate that both pH and temperature modulate capsaicin receptor activity in dental pulp.

    Conclusions:

    • Environmental factors, including pH and temperature, regulate the activity of capsaicin-sensitive neurons in dental pulp.
    • These findings have potential clinical implications for understanding and managing dental pain, particularly in inflamed tissues.