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[Assessment of 99mTc-DMSA renography and uptake compared with creatinine clearance in rats with drug-induced nephrotoxicity--II. Cisplatin-induced nephrotoxicity].

For evaluation of technetium-99m dimercaptosuccinic acid (99mTc-DMSA) renal uptake as an absolute renal function, 99mTc-DMSA uptake was compared with endogenous creatinine clearance (Ccr) in cisplatin-induced nephrotoxicity. At first, Male Wistar rats were given intraperitoneally 1.8 mg/kg/day of cisplatin for periods of 3, 5, 7 and 9 days. On the next day, 99mTc-DMSA uptake and Ccr were measured. Ccr of 5-day treated group was significantly lower than that of control (0.13 +/- 0.10 vs 0.34 +/- 0.05 ml/min/100 g; p less than 0.01) but 99mTc-DMSA uptake did not change. 99mTc-DMSA uptake of 7-day treated group was significantly lower than that of control (28.57 +/- 7.23 vs 39.84 +/- 2.23%; p less than 0.01). As the second experiment, cisplatin (3.6 mg/kg/day) was given intraperitoneally on the 1st, 2nd, 15th and 16th day. On the 5th, 8th, 11th, 15th, 20th, 23rd, 26th and 30th day, the same measurements were done as the first one. Ccr was lower in cisplatin treated rats on the 5th day than that in control (0.10 +/- 0.03 vs 0.34 +/- 0.05 ml/min/100 g; p less than 0.01), thereafter tended to be recovered to the control level. On the other hand, 99mTc-DMSA uptake was lower than that of control on the 8th, 11th and 15th day (32.40 +/- 3.86, 32.56 +/- 1.19, 35.21 +/- 2.97 vs 39.84 +/- 2.23%, respectively; p less than 0.01). The discrepancy between 99mTc-DMSA uptake and Ccr was observed in the cisplatin-induced nephrotoxicity. 99mTc-DMSA uptake was suggested to be a reliable indicator of a renal function in a different way from Ccr.