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Compensation of renal drug excretion after unilateral nephrectomy.

Twenty hours after unilateral nephrectomy (uNX) the PAH excretion of uninephrectomized rats reaches about 80% of the controls. Immediately after removal of one kidney the parenchyma loss can be compensated by an intensification of glomerular filtration. Thereafter the active tubular secretion capacity raises. 24 h after uNX, a significant increase of renal mass could be measured. The specific PAH accumulation capacity per 1 g renal cortical tissue increases significantly 96 h after uNX if the animals had been pretreated with cyclopenthiazide before the operation. Administration of azauracil or fluoruracil or neomycin causes a dose-dependent reduction of PAH elimination in sham operated as well as in uNX-rats. The effect of stimulation by cyclopenthiazide, also occurring after uNX could be reduced significantly by the inhibitors. The relative extent of compensation (80 +/- 10%) was not influenced by the inhibitors of protein synthesis. The compensation after uNX and the stimulation of renal tubular function are mediated by different mechanisms.