論文

査読有り
2010年10月

ULTRAVIOLET IRRADIATION OF THE EYE AND Fos-POSITIVE NEURONS INDUCED IN TRIGEMINAL BRAINSTEM AFTER INTRAVITREAL OR OCULAR SURFACE TRANSIENT RECEPTOR POTENTIAL VANILLOID 1 ACTIVATION

NEUROSCIENCE
  • Z. Chang
  • ,
  • K. Okamoto
  • ,
  • A. Tashiro
  • ,
  • D. A. Bereiter

170
2
開始ページ
678
終了ページ
685
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1016/j.neuroscience.2010.07.019
出版者・発行元
PERGAMON-ELSEVIER SCIENCE LTD

The interior structures of the eye are well supplied by the trigeminal nerve; however, the function of these afferent fibers is not well defined. The aim of this study was to use c-fos like immunohistochemistry (Fos-LI) to map the trigeminal brainstem complex after intravitreal microinjection or ocular surface application of capsaicin, a selective transient receptor potential vanilloid 1 (TRPV1) agonist in male rats under barbiturate anesthesia. The effect of ocular inflammation on Fos-LI was tested 2 or 7 days after UV irradiation of the eye. In non-inflamed controls, intravitreal capsaicin produced peaks of Fos-LI at the trigeminal subnucleus interpolaris/caudalis (Vi/Vcvl) transition and in superficial laminae at the caudalis/upper cervical cord (Vc/C1) junction regions. At the Vc/C1 junction intravitreal capsaicin induced Fos-LI in a dose-dependent manner, while at the Vi/Vcvl transition responses were similar after vehicle or capsaicin injections. Two days, but not 7 days, after UV irradiation intravitreal and ocular surface capsaicin-evoked Fos-LI at the Vc/C1 junction and nucleus tractus solitarius (NTS) were markedly enhanced, whereas the responses at the Vi/Vcvl transition were not different from non-inflamed controls. More than 80% of trigeminal ganglion neurons labeled after intravitreal microinjection of Fluorogold also expressed immunoreactivity for the TRPV1 receptor. These findings suggested that most intraocular trigeminal sensory nerves serve as nociceptors. The similar pattern and magnitude of Fos-LI after capsaicin suggested that TRPV1-responsive trigeminal nerves that supply intraocular and ocular surface tissues form a unified integrative circuit in the caudal brainstem. Intensity coding of capsaicin concentration and facilitation of Fos-LI expression after UV irradiation strongly supported the hypothesis that the Vc/C1 junction was critical for nociceptive processing related to ocular pain, whereas the Vi/Vcvl transition region likely served other functions in ocular homeostasis under naive and inflamed conditions. Published by Elsevier Ltd on behalf of IBRO.

リンク情報
DOI
https://doi.org/10.1016/j.neuroscience.2010.07.019
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000281939100030&DestApp=WOS_CPL
ID情報
  • DOI : 10.1016/j.neuroscience.2010.07.019
  • ISSN : 0306-4522
  • eISSN : 1873-7544
  • Web of Science ID : WOS:000281939100030

エクスポート
BibTeX RIS