Therapeutic potential of pyridoxine (vit B6) was evaluated against cadmium induced hepatic cytotoxicity in culture and oxidative stress in rats. Nonmalignant "Chang" liver cell culture was exposed to Cd (cadmium chloride) that produced cytotoxicity in terms of increase in cell growth inhibition rate, alanine aminotransferase, lactate dehydrogenase and lipid peroxidation, which was significantly mitigated by pyridoxine in a concentration dependent manner. Acute exposure to Cd (6.5mg/kg body weight; ip once only) produced a condition of hepatic oxidative stress by substantially increasing lipid peroxidation and oxidized glutathione level along with corresponding decrease in reduced glutathione and various antioxidant enzymes, i.e., superoxide dismutase, catalase, glutathione-S-transferase and glucose-6-phosphate dehydrogenase. Cadmium administration significantly increased the leakage of liver marker enzymes in serum, i.e., transaminases, alkaline phosphatase and lactate dehydrogenase. Therapy with pyridoxine after 3h of Cd administration decreased the release of serum transaminases, alkaline phosphatase and lactate dehydrogenase towards control. Administration of pyridoxine inhibited lipid peroxidation and formation of oxidized glutathione, increased the reduced glutathione level and restored the activities of aforesaid antioxidant enzymes towards control. The observations clearly demonstrated that pyridoxine treatment mitigates cadmium induced hepatic cytotoxicity and oxidative stress and provides evidence that it may be used clinically against Cd-induced hepatic toxicity.
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