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The effect of taurine (TA) on acute paraquat (PQ) intoxication was investigated in rats. Treatment with TA was begun 10 min after rats received a s. c. injection of PQ 40 mg/kg. Saline (0.9%) or 5% TA solution were infused i.v. for 5-6 min (short-interval infusion study). One hour after TA infusion, PQ concentration in the blood was increased and that in the urine was lowered, as compared with those in the saline-infused group. Significant increases of the PQ concentration was observed in kidney at 3 hours after TA administration. Excreted urine volume was significantly higher in the TA group during the time-period of 0-1 and 0-5 hours after the 5% TA administration compared with that of the saline group. However, there were no significant differences in total urinary PQ excretion between the two groups. Saline or 2.5% and 5% TA was infused continuously during the time-period of 0-1, 0-3 or 0-5 hours (long-interval infusion study). A marked increase in PQ concentration in blood and a reduction of PQ concentration in kidney were noticed during the time-period of 1-5 hours after the 5%TA infusion. Urinary excretion was remarkably accelerated by 5% TA infusion and the total urine volume increased to 20 times during the time-period 0-1 hour and 1.7 times during the time-period of 3-5 hours as compared with the saline control. In addition, urinary volume during the time-period of 0-5 hours almost reached that of 5% TA volume which infused to animals. The mortality rate of the groups that received either single or double short-time infusion of 5% TA was 100%. Thus, these results suggest that a long continuous infusion of 5% TA increased urine output and inhibits of PQ accumulation in renal tissue despite a rise in blood PQ concentration.

Protective effect of taurine against acute paraquat intoxication in rats.