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Intraplantar injection of anandamide inhibits mechanically-evoked responses of spinal neurones via activation of CB2 receptors in anaesthetised rats.
Neuropharmacology. 2003 Sep; 45(3):404-11.N

Abstract

Anti-nociceptive effects of the endocannabinoid anandamide are well established. Anandamide has, however, also been shown to activate pro-nociceptive vanilloid 1 (VR1) receptors present on primary afferent nociceptors. The aim of the present study was to determine the effect of intraplantar injection of anandamide on dorsal spinal neuronal responses in control rats and rats with hindpaw carrageenan-induced inflammation. Effects of intraplantar administration of anandamide (50 microg in 50 microl) on peripheral mechanically-evoked responses of spinal neurones were studied in halothane-anaesthetised rats in vivo. Responses of spinal neurones to mechanical punctate stimulation (von Frey filaments, 8-80 g) of the peripheral receptive field were similar in non-inflamed rats and rats with hindpaw carrageenan-induced inflammation. Intraplantar injection of anandamide, but not vehicle, significantly (P<0.05) inhibited innocuous and noxious mechanically-evoked responses of spinal neurones in rats with hindpaw inflammation, but not in non-inflamed rats. Co-administration of the cannabinoid (2) (CB(2)) receptor antagonist, SR144528 (10 microg in 50 microl), but not the cannabinoid (1) (CB(1)) receptor antagonist, SR141716A (10 microg in 50 microl), significantly blocked inhibitory effects of anandamide on peripheral evoked neuronal responses in rats with hindpaw inflammation. This study demonstrates inhibitory effects of exogenous anandamide on mechanically-evoked responses under inflammatory conditions in vivo, which are mediated by peripheral CB(2) receptors.

Authors+Show Affiliations

Queen's Medical Centre, School of Biomedical Sciences, E Floor Medical School, University of Nottingham, NG7 2UH, Nottingham, UK.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

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

Language

eng

PubMed ID

12871657

Citation

Sokal, D M., et al. "Intraplantar Injection of Anandamide Inhibits Mechanically-evoked Responses of Spinal Neurones Via Activation of CB2 Receptors in Anaesthetised Rats." Neuropharmacology, vol. 45, no. 3, 2003, pp. 404-11.
Sokal DM, Elmes SJ, Kendall DA, et al. Intraplantar injection of anandamide inhibits mechanically-evoked responses of spinal neurones via activation of CB2 receptors in anaesthetised rats. Neuropharmacology. 2003;45(3):404-11.
Sokal, D. M., Elmes, S. J., Kendall, D. A., & Chapman, V. (2003). Intraplantar injection of anandamide inhibits mechanically-evoked responses of spinal neurones via activation of CB2 receptors in anaesthetised rats. Neuropharmacology, 45(3), 404-11.
Sokal DM, et al. Intraplantar Injection of Anandamide Inhibits Mechanically-evoked Responses of Spinal Neurones Via Activation of CB2 Receptors in Anaesthetised Rats. Neuropharmacology. 2003;45(3):404-11. PubMed PMID: 12871657.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Intraplantar injection of anandamide inhibits mechanically-evoked responses of spinal neurones via activation of CB2 receptors in anaesthetised rats. AU - Sokal,D M, AU - Elmes,S J R, AU - Kendall,D A, AU - Chapman,V, PY - 2003/7/23/pubmed PY - 2003/10/1/medline PY - 2003/7/23/entrez SP - 404 EP - 11 JF - Neuropharmacology JO - Neuropharmacology VL - 45 IS - 3 N2 - Anti-nociceptive effects of the endocannabinoid anandamide are well established. Anandamide has, however, also been shown to activate pro-nociceptive vanilloid 1 (VR1) receptors present on primary afferent nociceptors. The aim of the present study was to determine the effect of intraplantar injection of anandamide on dorsal spinal neuronal responses in control rats and rats with hindpaw carrageenan-induced inflammation. Effects of intraplantar administration of anandamide (50 microg in 50 microl) on peripheral mechanically-evoked responses of spinal neurones were studied in halothane-anaesthetised rats in vivo. Responses of spinal neurones to mechanical punctate stimulation (von Frey filaments, 8-80 g) of the peripheral receptive field were similar in non-inflamed rats and rats with hindpaw carrageenan-induced inflammation. Intraplantar injection of anandamide, but not vehicle, significantly (P<0.05) inhibited innocuous and noxious mechanically-evoked responses of spinal neurones in rats with hindpaw inflammation, but not in non-inflamed rats. Co-administration of the cannabinoid (2) (CB(2)) receptor antagonist, SR144528 (10 microg in 50 microl), but not the cannabinoid (1) (CB(1)) receptor antagonist, SR141716A (10 microg in 50 microl), significantly blocked inhibitory effects of anandamide on peripheral evoked neuronal responses in rats with hindpaw inflammation. This study demonstrates inhibitory effects of exogenous anandamide on mechanically-evoked responses under inflammatory conditions in vivo, which are mediated by peripheral CB(2) receptors. SN - 0028-3908 UR - https://www.unboundmedicine.com/medline/citation/12871657/Intraplantar_injection_of_anandamide_inhibits_mechanically_evoked_responses_of_spinal_neurones_via_activation_of_CB2_receptors_in_anaesthetised_rats_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0028390803001953 DB - PRIME DP - Unbound Medicine ER -