Trigeminal nociceptors express TLR-4 and CD14: A mechanism for pain due to infection

Research output: Contribution to journalArticle

149 Citations (Scopus)

Abstract

Although certain bacterial species appear to be risk factors for pain due to odontogenic infections, comparatively little is known about the potential mechanisms mediating this effect. In this study, we tested the hypothesis that trigeminal nociceptive neurons express the TLR4 or CD14 receptors, thus enabling sensory neurons to detect and respond to tissue levels of bacterial substances such as lipopolysaccharide (LPS). Immunohistochemical analyses of human and rat trigeminal neurons demonstrated that a capsaicin-sensitive subclass of nociceptors (defined by expression of TRPV1, a capsaicin receptor) expresses both TLR4 and CD14. Moreover, human dental pulp collected from patients with caries lesions demonstrated co-localization of TLR4 and CD14, with markers of peripheral sensory neurons. Collectively, these studies indicate that the capsaicin-sensitive subclass of trigeminal nociceptors expresses TLR4 and CD14. These results indicate that pain due to bacterial infections may result, in part, from direct activation of nociceptors by bacterial products such as LPS.

Original languageEnglish (US)
Pages (from-to)49-53
Number of pages5
JournalJournal of Dental Research
Volume85
Issue number1
DOIs
StatePublished - Jan 2006

Fingerprint

Nociceptors
Pain
Capsaicin
Sensory Receptor Cells
Infection
Lipopolysaccharides
TRPV Cation Channels
Dental Pulp
Bacterial Infections
Neurons

Keywords

  • Bacteria
  • CD14
  • Infection
  • LPS
  • Pain
  • TLR4
  • TRPV1

ASJC Scopus subject areas

  • Dentistry(all)

Cite this

Trigeminal nociceptors express TLR-4 and CD14 : A mechanism for pain due to infection. / Wadachi, R.; Hargreaves, Kenneth M.

In: Journal of Dental Research, Vol. 85, No. 1, 01.2006, p. 49-53.

Research output: Contribution to journalArticle

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