Comparative studies on the validity of renal function tests in the experimentally-induced bovine glomerulonephritis

To establish the usefulness of the bovine clinical renal function tests, experimental glomerulonephritis was experimentally induced in calves and some renal clearance tests were performed. Two (No. 1, 2) of three calves were injected intravenously with anti-bovine kidney rabbit serum (antiserum) and the other (No. 3) with normal rabbit serum (control serum). The early stage of proliferative glomerulonephritis was observed in the kidneys of Nos. 1 and 2. The degree of lesions in No. 1 was severer than that in No. 2. No remarkable change was observed in the kidneys of No. 3. Endogenous creatinine clearance value (CCRE), thiosulfate clearance value (CTHIO) and maximal tubular secretion of para-amino hippuric acid (TmPAH) of all calves did not show remarkable changes after the injection of antiserum or control serum. In the phenolsulfonphthalein (PSP) test, PSP excretion of Nos. 1 and 2 was disposed to delay after the injection, and in No. 3 there was no significant change after the injection. PAH clearance value (CPAH) of No. 1 decreased from 10.24 to 6.96 ml/min/kg (-32%). A small change was noted in the CPAH of Nos. 2 and 3. These results suggest that the simplified method for measuring CPAH performed in this study could assess the lesions formed in No. 1, which was pathologically diagnosed as the early stage of proliferative glomerulonephritis.