title: Antinociceptive effect of Butea monosperma on vincristine-induced neuropathic pain model in rats.
abstract: Neuropathic pain is a chronic neurodegenerative disease. It is well characterized by spontaneous pain, hyperalgesia, hypothesia, dysesthesia and allodynia. The present study was designed to investigate the antinociceptive potential of Butea monosperma on vincristine-induced painful neuropathy in rats. Vincristine was administered for induction of neuropathic pain in experimental animals. Hot plate, acetone drop, paw pressure, Von Frey hair and tail immersion tests were performed to assess the degree of thermal hyperalgesia, cold chemical allodynia, mechanical hyperalgesia and allodynia in the hind paw and tail thermal hyperalgesia, respectively, as an index of peripheral and central pain sensation. Tissue thiobarbituric acid reactive substances (TBARSs), reduced glutathione (GSH) and total calcium levels were estimated to assess the biochemical changes in the sciatic nerve tissue. Microscopically, histopathological changes were also observed in the sciatic nerve tissue. Ethanolic extract of B. monosperma leaves and pregabalin were administered for 14 consecutive days. Vincristine administration resulted in significant reduction in behavioural (i.e. hyperalgesia and allodynic pain sensation) changes along with a rise in the levels of TBARS, total calcium and decrease in GSH levels when compared with the normal control group. Moreover, significant histological changes were also observed. Pretreatment with B. monosperma significantly attenuated vincristine-induced development of painful behavioural, biochemical and histological changes in a dose-dependent manner, which is similar to that of pregabalin-pretreated group. B. monosperma ameliorated vincristine-induced painful neuropathy. It may be due to its potential of antioxidative, neuroprotective and calcium channel inactivation.
authors.affiliation: School of Chemical and Biotechnology, Sastra University, Thanjavur, Tamilnadu, India. vrkmmcmadurai@gmail.com
authors.forename: Venkata Rathina Kumar
authors.initials: VR
authors.lastname: Thiagarajan
authors.forename: Palanichamy
authors.initials: P
authors.lastname: Shanmugam
authors.forename: Uma Maheswari
authors.initials: UM
authors.lastname: Krishnan
authors.forename: Arunachalam
authors.initials: A
authors.lastname: Muthuraman
authors.forename: Nirmal
authors.initials: N
authors.lastname: Singh
mesh_terms: D000700:Analgesics / Q000494:pharmacology*; D000818:Animals; D000972:Antineoplastic Agents, Phytogenic / Q000633:toxicity; D000975:Antioxidants / Q000494:pharmacology*; D001522:Behavior, Animal / Q000187:drug effects; D031290:Butea / Q000737:chemistry*; D002118:Calcium / Q000378:metabolism; D004195:Disease Models, Animal; D005260:Female; D005978:Glutathione / Q000378:metabolism; D006614:Hindlimb; D006358:Hot Temperature; D006930:Hyperalgesia / Q000188:drug therapy / Q000503:physiopathology; D008297:Male; D009437:Neuralgia / Q000139:chemically induced / Q000188:drug therapy* / Q000378:metabolism / Q000473:pathology; D018384:Oxidative Stress / Q000187:drug effects; D010147:Pain Measurement; D010523:Peripheral Nervous System Diseases / Q000139:chemically induced / Q000188:drug therapy* / Q000378:metabolism / Q000473:pathology; D010936:Plant Extracts / Q000494:pharmacology*; D018515:Plant Leaves / Q000737:chemistry; D000069583:Pregabalin; D051381:Rats; D017208:Rats, Wistar; D012584:Sciatic Nerve / Q000187:drug effects / Q000378:metabolism / Q000473:pathology; D013623:Tail; D017392:Thiobarbituric Acid Reactive Substances / Q000378:metabolism; D016896:Treatment Outcome; D014750:Vincristine / Q000633:toxicity; D005680:gamma-Aminobutyric Acid / Q000031:analogs & derivatives / Q000494:pharmacology
chemical_list: D000700:Analgesics; D000972:Antineoplastic Agents, Phytogenic; D000975:Antioxidants; D010936:Plant Extracts; D017392:Thiobarbituric Acid Reactive Substances; D000069583:Pregabalin; D005680:gamma-Aminobutyric Acid; D014750:Vincristine; D005978:Glutathione; D002118:Calcium