Renal handling of homologous and heterologous insulin in the isolated perfused rat kidney

Abstract
Renal handling of pig-and rat-insulin was studied in the isolated perfused rat kidney. Metabolic clearance rates of both pig- and rat-insulin excceded GFR. Peritubular uptake of pig-insulin accounted for 13%, of rat-insulin for 31% of the total metabolic clearance. The nonfiltering kidney does not remove insulin from the peritubular circulation. Metabolic clearance rates of pig- and rat-insulin are directly related to GFR. The filtration process seems to be necessary for the uptake of insulin at the peritubular site.