Effectiveness of bis(phenylimidazoselenazolyl) diselenide on a mouse model of inflammatory nociception.
The injection of complete Freund's adjuvant (CFA) in the hindpaw of rodents induces tissue inflammation and nociceptive hypersensitivity. In addition, it has been reported that organoselenium compounds have antinociceptive properties in animal models. The purpose of this study was to investigate the potential antinociceptive effect of bis(phenylimidazoselenazolyl) diselenide (BPIS) in the inflammatory nociception model in mice and its possible mechanism of action. C57BL/6 mice received CFA intraplantar in right hindpaw and the inflammatory response was verified 24h after injection as well as the antinociceptive effect of BPIS. The CFA-induced mechanical allodynia was reversed by BPIS treatment (1mg/kg, p.o.) observed through the von Frey hair test. Additionally, L-arginine (600mg/kg; i.p.), administered before BPIS treatment, blocked its antinociceptive effect. Regarding myeloperoxidase activity, NOx and 3-nitrotyrosine levels, BPIS administration did not reverse alterations observed in the paw of animals injected with CFA. BPIS reversed the increase in spinal NOx content induced by CFA. In the spinal cord, it was also found that CFA induced an increase in malondialdehyde content and a decrease in glutamate uptake, and these alterations were reversed by BPIS. Moreover, BPIS treatment induced an increase in non-protein thiol levels in spinal cord of animals that received CFA injection. No alterations were found in glutathione peroxidase, reductase and S-transferase activities of experimental groups. The obtained data reinforce the relevance of BPIS as an antinociceptive agent as well as highlight the importance of the nitric oxide pathway in the spinal cord and its antioxidant potential for its mechanism of action.
['Chagas|Pietro Maria|PM|', 'da Cruz Weber Fulco|Bruna|B|', 'Pesarico|Ana Paula|AP|', 'Roehrs|Juliano Alex|JA|', 'Nogueira|Cristina Wayne|CW|']
D000818:Animals D000893:Anti-Inflammatory Agents D004195:Disease Models, Animal D004305:Dose-Response Relationship, Drug D006930:Hyperalgesia D007249:Inflammation D008297:Male D051379:Mice D008810:Mice, Inbred C57BL D059225:Nociception D016566:Organoselenium Compounds D010147:Pain Measurement D016896:Treatment Outcome
Nociception Spinal cord Nitric oxide Selenium