Neuroprotective Effect of Baicalein Against Oxaliplatin-Induced Peripheral Neuropathy: Impact on Oxidative Stress, Neuro-inflammation and WNT/β-Catenin Signaling.

Abstract

Oxaliplatin, an effective anti-cancer agent used in the treatment of colorectal cancer, isassociated with severe dose-limiting side effects like peripheral neuropathy, which currently remains a major unmet clinical need. This study was designed to investigate the possible neuroprotective potential of a bioflavonoid, baicalein in an experimental model of oxaliplatin-induced peripheral neuropathy. Rats were administered with a dose of 4mg/kg oxaliplatin i.p. twice per week for four weeks, and were evaluated for behavioral and functional nerve parameters, followed by biochemical, immunohistochemical and western blot analysis. This study shows that baicalein reversed oxaliplatin-induced behavioral deficits and significantly prevented oxaliplatin-induced sensory nerve conduction deficits in rats. Molecular analysis revealed baicalein significantly strengthened the antioxidant defense system by enhancing the expression of MnSOD, HO-1, and GSH levels. Baicalein treatment neutralized the oxaliplatin-induced neuroinflammation, which was evident from the significant loss of inflammatory mediators like TNF-α, IL-6 and a shunted NF-κB nuclear translocation. Additionally, baicalein treatment resulted in a significant downregulation of active β-catenin, Wnt5b and Wnt3a proteins. In line with the in vivo evidences, baicaleintreatment in Neuro2a cells attenuated oxaliplatin-induced ROS, mitochondrial superoxide levels and improved neuritogenesis.Additionally, baicalein did not alter the cell viability of oxaliplatin in HCT-116 cell line. Collectively, these results suggest that baicalein may be useful for management of peripheral neuropathy associated with oxaliplatin.