TRPV4 mediates pain-related behavior induced by mild hypertonic stimuli in the presence of inflammatory mediator.

Published

Journal Article

The ligand-gated ion channel, TRPV4, functions as a transducer of hypotonic stimuli in primary afferent nociceptive neurons and contributes to inflammatory and neuropathic pain. Hypertonic saline also stimulates primary afferent nociceptors and the injection of mild hypertonic saline (2-5%) is widely used as an experimental model of pain in humans. Therefore, we tested whether TRPV4 participates in the transduction of hypertonic stimuli. Intradermal injection of 2% (607 mOsm) or 10% (3,250 mOsm) saline solution in the hind paw of rats induced a concentration-dependent pain-related behavior, flinching. Sensitization with prostaglandin E(2) (PGE(2)) caused a 7-fold increase in the number of flinches induced by 2% saline but failed to increase those caused by 10% saline. Spinal administration of antisense oligodeoxynucleotides to TRPV4 caused a 46% decrease in the number of flinches induced by 2% saline, but there was no change in flinching induced by 10% saline. Similarly, only the nociceptive behavior caused by 2% saline was reduced in TRPV4(-/-) knockout mice. The TRPV4-mediated nociceptive behaviors induced by hyper- and hypotonic stimuli were dependent on Src tyrosine kinase. We suggest TRPV4 is a transducer in primary afferents that mediates nociceptive behavior induced by small increases or decreases in osmolarity. Such changes in osmolarity might contribute to pain in inflammatory and neuropathic states.

Full Text

Duke Authors

Cited Authors

  • Alessandri-Haber, N; Joseph, E; Dina, OA; Liedtke, W; Levine, JD

Published Date

  • November 2005

Published In

Volume / Issue

  • 118 / 1-2

Start / End Page

  • 70 - 79

PubMed ID

  • 16213085

Pubmed Central ID

  • 16213085

International Standard Serial Number (ISSN)

  • 0304-3959

Digital Object Identifier (DOI)

  • 10.1016/j.pain.2005.07.016

Language

  • eng

Conference Location

  • United States