Abstract
Reactive oxygen species are signaling mediators of nociceptive pathways. Exogenous administrations of antioxidants show anti-hyperalgesic effect. However, very little is known about the role of endogenous antioxidant defense system in pain pathology. Curcumin is a dietary antioxidant which shows ameliorative effect on thermal hypersensitivity, however detailed study is lacking. Present study was aimed to analyze the changes in oxidative stress, modulation of antioxidant enzymes and pro-inflammatory cytokines in complete Freund’s adjuvant induced inflammatory hyperalgesia and the effect of curcumin on antioxidant defense system and pro-inflammatory cytokines. Anti-hyperalgesic activity of curcumin was evidenced after 6 h of treatment. Oxidative stress was evidenced in paw skin and spinal cord of hyperalgesic rats by high level of lipid peroxidation. A decrease in activity of antioxidant enzymes like catalase, superoxide dismutase, glutathione peroxidase, glutathione reductase and an increase in level of pro-inflammatory cytokines TNF-α, IL-1β and IL-6 in paw skin was observed as compared to normal rats. However, activity of antioxidant enzymes was enhanced in spinal cord. The changes were brought towards normal level after curcumin treatment. The results suggest that modulation of antioxidant defense system is early event in initiation of inflammatory hyperalgesia which might lead to initiation of other signaling pathways mediated by lipid peroxide, TNF-α, IL-1β and IL-6. Decrease in oxidative stress and down regulation of these cytokines by curcumin is suggested to be involved in its anti-hyperalgesic effect.
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Authors are thankful to DRDO, India for financial support (Grant No. ERIP/ER/1003851/M/01/1336). A.K.S. thanks UGC, India for JRF & SRF.
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Singh, A.K., Vinayak, M. Curcumin Attenuates CFA Induced Thermal Hyperalgesia by Modulation of Antioxidant Enzymes and Down Regulation of TNF-α, IL-1β and IL-6. Neurochem Res 40, 463–472 (2015). https://doi.org/10.1007/s11064-014-1489-6
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DOI: https://doi.org/10.1007/s11064-014-1489-6