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Abstract
N-Phthaloyl GABA was administrated daily (50 mg/kg body weight-i.p) to Wistar rats for 21 days and circadian rhythms of thiobarbituric acid reactive substances (TBARS) and antioxidants such as reduced glutathione (GSH), catalase (CAT) and superoxide dismutase (SOD) were studied. N-Phthaloyl GABA was found to delay TBARS and to advance GSH, CAT and SOD acrophases. Amplitude and mesor values of these rhythms were found to be altered during N-Phthaloyl GABA treatment. Since GABA is hypothesized to be involved in conveying dark information to clock, exogenous administration of P-GABA might alter the photic information received by the clock. Our study shows that P-GABA administration alters the temporal patterns of lipid peroxidation and antioxidants in Wistar rats. But the exact mechanism remains to be explored and further research is needed.