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Am J Physiol Renal Physiol 277: F139-F145, 1999;
0363-6127/99 $5.00
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Vol. 277, Issue 1, F139-F145, July 1999

Puromycin aminonucleoside nephrosis results in a marked increase in fractional clearance of albumin

Tanya M. Osicka, Alexandra R. Hankin, and Wayne D. Comper

Department of Biochemistry and Molecular Biology, Monash University, Clayton, Victoria, Australia 3168

Puromycin aminonucleoside nephrosis (PAN) results in a marked increase in the fractional clearance of albumin. The increase in the fractional clearance of [3H]albumin to ~0.045, as measured both in vivo and in the isolated perfused rat kidney (IPK) with PAN, occurs without an accompanying equivalent increase in glomerular capillary wall size selectivity as previously measured with dextrans. This is very similar to the marked increase in albuminuria seen with kidneys treated with inhibitors of endocytosis by the tubular epithelium, particularly lysine (T. M. Osicka, L. M. Pratt, and W. D. Comper. Nephrology 2: 199-212, 1996). The similarity is further established that, like in the presence of lysine, [3H]albumin excreted in urine from rats with PAN is essentially intact whereas, in both in vivo and IPK control experiments, excreted [3H]albumin is heavily degraded. The same observations have also been made for 3H-labeled anionic horseradish peroxidase. These observations suggest that the significant albuminuria that occurs in PAN is primarily post-glomerular basement membrane in origin.

horseradish peroxidase; permeability; degradation; albuminuria; proximal tubular cells


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