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Traumatic brain injury (TBI) is an insult to the brain from an external mechanical force, leading to temporary/permanent secondary injuries, i.e. impairment of cognitive, physical, and psycho-social functions with altered consciousness. The leading mechanism responsible for neuronal damage following TBI is an increase in oxidative reactions initiated by free radicals generated by the injury along with various other mechanisms. Nerolidol is reported to have potent antioxidant and anti-neuroinflammatory properties. The present study was designed to explore the neuroprotective effect of nerolidol in weight-drop-induced TBI in rats. Animals were injured on the 1st day by dropping a free-falling weight of 200 gm from a height of 1 m through a guide pipe onto the exposed skull. After 14 days of injury, nerolidol (25, 50, and 100 mg/kg,  i.p. ) treatment was given for the next 14 days. Locomotor activity and motor coordination were evaluated using an actophotometer and rotarod, respectively. Cognitive impairment was observed through the Morris Water Maze and Object Recognition Test. On the 29th day, animals were sacrificed, and their brains were collected for the biochemical estimation. The weight drop model significantly decreased locomotor activity, motor coordination, increased Acetylcholinesterase (AChE) activity, oxidative stress, and induced cognitive deficits in TBI rats. Nerolidol significantly improved locomotor activity, reversed motor incoordination and cognitive impairment, and reduced the AChE activity and oxidative/nitrosative stress. The present study demonstrates the promising neuroprotective effects of nerolidol, which might improve the quality of life of TBI patients.

Neuroprotective effect of nerolidol in traumatic brain injury associated behavioural comorbidities in rats