ArticlesTocotrienol ameliorates behavioral and biochemical alterations in the rat model of alcoholic neuropathyTiwari, Vinod; Kuhad, Anurag; Chopra, Kanwaljit*Author Information Pharmacology Research Laboratory, University Institute of Pharmaceutical Sciences, UGC Center of Advanced Study, Panjab University, Chandigarh-160 014, India *Corresponding author. Tel.: +91 172 2534105; fax: +91 172 2541142. E-mail: [email protected] ARTICLE INFO Article history: Received March 29, 2009; Received in revised form May 27, 2009; Accepted May 28, 2009. Pain: September 2009 - Volume 145 - Issue 1 - p 129-135 doi: 10.1016/j.pain.2009.05.028 Buy Metrics Abstract Chronic alcohol consumption produces a painful peripheral neuropathy for which there is no reliable successful therapy, which is mainly due to lack of understanding of its pathobiology. Alcoholic neuropathy is characterized by spontaneous burning pain, hyperalgesia (an exaggerated pain in response to painful stimuli) and allodynia (a pain evoked by normally innocuous stimuli). Chronic alcohol intake is known to decrease the nociceptive threshold with increased oxidative–nitrosative stress and release of proinflammatory cytokines coupled with activation of protein kinase C. The aim of the present study is to investigate the effect of both isoforms of vitamin E, α-tocopherol (100 mg/kg; oral gavage) and tocotrienol (50, 100 and 200 mg/kg; oral gavage) against alcohol-induced neuropathic pain in rats. Male Wistar rats, were administered 35% v/v ethanol (10 g/kg; oral gavage) for 10 weeks, and were treated with α-tocopherol and tocotrienol for the same duration. Ethanol-treated animals showed a significant decrease in nociceptive threshold as evident from decreased tail flick latency (thermal hyperalgesia) and decreased paw-withdrawal threshold in Randall–Sellito test (mechanical hyperalgesia) and von-Frey hair test (mechanical allodynia) along with the reduction in nerve glutathione and superoxide dismutase levels. TNF-α and IL-1β levels were also significantly increased in both serum and sciatic nerve of ethanol-treated rats. Treatment with α-tocopherol and tocotrienol for 10 weeks significantly improved all the above-stated functional and biochemical deficits in a dose-dependent manner with more potent effects observed with tocotrienol. The study demonstrates the effectiveness of tocotrienol in attenuation of alcoholic neuropathy. © 2009 Lippincott Williams & Wilkins, Inc.