Smoke induced oxidative stress is known to cause various cancers and associated health problems including lung cancer. Herbal extracts have been reported as antioxidant supplements which attenuate free radical induced oxidative damage of tissues, among which Ocimum sanctum has been reported as the elixir of life due to its innumerable health benefits. In the present study, we investigated the protective effect of O. sanctum against cracker smoke induced lung and brain tissue damage. The results of the study demonstrate that O. sanctum regulates the hematological and serum biochemical parameters such as RBC, WBC, blood urea nitrogen and creatinine kinase. O. sanctum supplementation inhibited oxidative stress as analyzed by SOD, CAT enzyme levels and i-NOS, HSP-70 protein expression. O. sanctum administration also regulated neurotransmitter levels, such as serotonin, dopamine, and regulated acetylcholine esterase levels which play a vital role in neuronal function. Further O. sanctum treatment also preserved the morphology of lung and brain tissues of smoke stress induced rats as observed by histopathology and transmission electron microscope analysis. The biodistribution of O. sanctum was showed its accumulation in key tissues such as kidney, liver, lungs and heart. The LC-ESI-MS/MS analysis of O. sanctum showed the presence of polyphenols, flavonoids and fatty acids which might be responsible for the observed anti-stress effects.
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