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Spinal administration of capsazepine inhibits noxious evoked responses of dorsal horn neurons in non-inflamed and carrageenan inflamed rats.
Brain Res. 2002 May 10; 935(1-2):103-8.BR

Abstract

Vanilloid VR1 receptors are located in the dorsal horn of the spinal cord. The aim of the present study was to determine the role of spinal vanilloid receptors (VR1) during nociceptive processing in control and inflamed rats. Effects of spinal administration of capsazepine (0.5-30 microM/50 microl), a competitive VR1 antagonist, on innocuous and noxious evoked responses of spinal neurones were studied in halothane anaesthetised rats. Transcutaneous electrical-evoked neuronal responses of spinal neurones were recorded in control and carrageenan (2%, 3 h) inflamed rats. Spinal application of capsazepine did not significantly alter Abeta-fibre evoked responses of neurones, however Adelta-fibre evoked responses were significantly inhibited by capsazepine in both non-inflamed and carrageenan inflamed rats (30 microM: non-inflamed 31+/-8% of control, P<0.01: carrageenan-inflamed 43+/-6% of control, P<0.01). Similarly, the evoked C-fibre mediated post-discharge responses of spinal neurones in non-inflamed and carrageenan inflamed rats were reduced by capsazepine (30 microM: non-inflamed 41+/-14% of control, P<0.01: carrageenan-inflamed 31+/-9% of control, P<0.01). These results demonstrate a role of spinal VR1 receptors during noxious, but not innocuous transmission, at the level of the spinal cord. The degree of effect of capsazepine on evoked neuronal responses was similar in control and inflamed rats, suggesting that the role of spinal VR1 receptors is not altered following short-term peripheral inflammation. Our data suggest that following noxious peripheral stimulation, spinal VR1 receptors are activated, but the endogenous ligands mediating this effect remain to be elucidated.

Authors+Show Affiliations

School of Biomedical Sciences, University of Nottingham Medical School, Queen's Medical Centre, Nottingham NG9 2UH, UK.No affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

12062478

Citation

Kelly, Sara, and Victoria Chapman. "Spinal Administration of Capsazepine Inhibits Noxious Evoked Responses of Dorsal Horn Neurons in Non-inflamed and Carrageenan Inflamed Rats." Brain Research, vol. 935, no. 1-2, 2002, pp. 103-8.
Kelly S, Chapman V. Spinal administration of capsazepine inhibits noxious evoked responses of dorsal horn neurons in non-inflamed and carrageenan inflamed rats. Brain Res. 2002;935(1-2):103-8.
Kelly, S., & Chapman, V. (2002). Spinal administration of capsazepine inhibits noxious evoked responses of dorsal horn neurons in non-inflamed and carrageenan inflamed rats. Brain Research, 935(1-2), 103-8.
Kelly S, Chapman V. Spinal Administration of Capsazepine Inhibits Noxious Evoked Responses of Dorsal Horn Neurons in Non-inflamed and Carrageenan Inflamed Rats. Brain Res. 2002 May 10;935(1-2):103-8. PubMed PMID: 12062478.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Spinal administration of capsazepine inhibits noxious evoked responses of dorsal horn neurons in non-inflamed and carrageenan inflamed rats. AU - Kelly,Sara, AU - Chapman,Victoria, PY - 2002/6/14/pubmed PY - 2002/8/8/medline PY - 2002/6/14/entrez SP - 103 EP - 8 JF - Brain research JO - Brain Res VL - 935 IS - 1-2 N2 - Vanilloid VR1 receptors are located in the dorsal horn of the spinal cord. The aim of the present study was to determine the role of spinal vanilloid receptors (VR1) during nociceptive processing in control and inflamed rats. Effects of spinal administration of capsazepine (0.5-30 microM/50 microl), a competitive VR1 antagonist, on innocuous and noxious evoked responses of spinal neurones were studied in halothane anaesthetised rats. Transcutaneous electrical-evoked neuronal responses of spinal neurones were recorded in control and carrageenan (2%, 3 h) inflamed rats. Spinal application of capsazepine did not significantly alter Abeta-fibre evoked responses of neurones, however Adelta-fibre evoked responses were significantly inhibited by capsazepine in both non-inflamed and carrageenan inflamed rats (30 microM: non-inflamed 31+/-8% of control, P<0.01: carrageenan-inflamed 43+/-6% of control, P<0.01). Similarly, the evoked C-fibre mediated post-discharge responses of spinal neurones in non-inflamed and carrageenan inflamed rats were reduced by capsazepine (30 microM: non-inflamed 41+/-14% of control, P<0.01: carrageenan-inflamed 31+/-9% of control, P<0.01). These results demonstrate a role of spinal VR1 receptors during noxious, but not innocuous transmission, at the level of the spinal cord. The degree of effect of capsazepine on evoked neuronal responses was similar in control and inflamed rats, suggesting that the role of spinal VR1 receptors is not altered following short-term peripheral inflammation. Our data suggest that following noxious peripheral stimulation, spinal VR1 receptors are activated, but the endogenous ligands mediating this effect remain to be elucidated. SN - 0006-8993 UR - https://www.unboundmedicine.com/medline/citation/12062478/Spinal_administration_of_capsazepine_inhibits_noxious_evoked_responses_of_dorsal_horn_neurons_in_non_inflamed_and_carrageenan_inflamed_rats_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0006899302025520 DB - PRIME DP - Unbound Medicine ER -