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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. 2010 Oct 13; 170(2):678-85.N

Abstract

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 naïve and inflamed conditions.

Authors+Show Affiliations

Department of Diagnostic and Biological Sciences, University of Minnesota School of Dentistry, 18-214 Moos Tower, 515 Delaware Street South East, Minneapolis, MN 55455, USA. chang497@umn.eduNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, N.I.H., Extramural

Language

eng

PubMed ID

20643195

Citation

Chang, Z, et al. "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, vol. 170, no. 2, 2010, pp. 678-85.
Chang Z, Okamoto K, Tashiro A, et al. 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. 2010;170(2):678-85.
Chang, Z., Okamoto, K., Tashiro, A., & Bereiter, D. A. (2010). 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, 170(2), 678-85. https://doi.org/10.1016/j.neuroscience.2010.07.019
Chang Z, et al. 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. 2010 Oct 13;170(2):678-85. PubMed PMID: 20643195.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Ultraviolet irradiation of the eye and Fos-positive neurons induced in trigeminal brainstem after intravitreal or ocular surface transient receptor potential vanilloid 1 activation. AU - Chang,Z, AU - Okamoto,K, AU - Tashiro,A, AU - Bereiter,D A, Y1 - 2010/07/17/ PY - 2010/05/24/received PY - 2010/07/08/revised PY - 2010/07/09/accepted PY - 2010/7/21/entrez PY - 2010/7/21/pubmed PY - 2011/1/21/medline SP - 678 EP - 85 JF - Neuroscience JO - Neuroscience VL - 170 IS - 2 N2 - 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 naïve and inflamed conditions. SN - 1873-7544 UR - https://www.unboundmedicine.com/medline/citation/20643195/Ultraviolet_irradiation_of_the_eye_and_Fos_positive_neurons_induced_in_trigeminal_brainstem_after_intravitreal_or_ocular_surface_transient_receptor_potential_vanilloid_1_activation_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0306-4522(10)00997-8 DB - PRIME DP - Unbound Medicine ER -