Protective role of curcumin on colchicine-induced cognitive dysfunction and oxidative stress in rats

Dementia is a syndrome of progressive nature, affects wide range of cognitive abilities like memory, language, calculation and so on, neuropsychiatric and social deficits to impair the routine social functions. The present study was designed to assess the effect of curcumin against colchicine-induced cognitive dysfunction and oxidative stress in rats and compare it with rivastigmine. Colchicine (15 µg/5µl) was administered to male Wistar rats intracerebroventricularly (i.c.v.) by stereotaxic apparatus to induce cognitive dysfunction. Administration of colchicine caused poor retention of memory in elevated plus maze, passive avoidance apparatus and Morris water maze paradigms. Chronic treatment with curcumin (100, 200 and 400 mg/kg, p.o.) twice daily and rivastigmine (2.5 mg/kg, p.o.) daily for a period of 28 days beginning 7 days prior to colchicine injection significantly improved colchicine-induced cognitive impairment. Biochemical assessment revealed that i.c.v. colchicine injection significantly increased lipid peroxidation, depleted reduced glutathione levels and decreased acetyl cholinesterase (AChE) activity in rat brains. Chronic administration of curcumin significantly reduced the elevated lipid peroxidation, restored the reduced glutathione levels and AChE activity; however, rivastigmine failed to prevent oxidative stress. The results of the current study indicate that curcumin (100, 200 and 400 mg/kg, p.o.) twice daily has a protective role against colchicine-induced cognitive impairment and associated oxidative stress.