Laser modulation of heat and capsaicin receptor TRPV1 leads to thermal antinociception

J. J. Ryu, S. Yoo, K. Y. Kim, J. S. Park, S. Bang, S. H. Lee, T. J. Yang, H. Cho, S. W. Hwang

    Research output: Contribution to journalArticlepeer-review

    36 Citations (Scopus)

    Abstract

    Er,Cr:YSGG lasers are used clinically in dentistry. The advantages of laser therapy include minimal thermal damage and the alleviation of pain. This study examined whether the Er,Cr:YSGG laser has in vivo and in vitro antinociceptive effects in itself. In capsaicin-evoked acute licking/shaking tests and Hargreaves tests, laser irradiation with an aerated water spray suppressed nociceptive behavior in mice. Laser irradiation attenuated TRPV1 activation by capsaicin in Ca2+ imaging experiments with TRPV1-overexpressing cells and cultured trigeminal neurons. Therefore, the laser-induced behavioral changes are probably due to the loss of TRPV1 activity. TRPV4 activity was also attenuated, but limited mechanical antinociception by the laser was observed. The laser failed to alter the other receptor functions, which indicates that the antinociceptive effect of the laser is dependent on TRPV1. These results suggest that the Er,Cr:YSGG laser has analgesic effects via TRPV1 inhibition. Such mechanistic approaches may help define the laser-sensitive pain modality and increase its beneficial uses.

    Original languageEnglish
    Pages (from-to)1455-1460
    Number of pages6
    JournalJournal of Dental Research
    Volume89
    Issue number12
    DOIs
    Publication statusPublished - 2010 Dec

    Bibliographical note

    Funding Information:
    This work was supported by a Korea Research Foundation Grant (code KRF-2008-331-E00457 and 2009-0076543), the Republic of Korea.

    Keywords

    • Er,Cr:YSGG laser
    • TRPV1
    • nociceptive behavior
    • pain
    • trigeminal neurons

    ASJC Scopus subject areas

    • General Dentistry

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