Processing of 125I-insulin by polarized cultured kidney cells.


Renal clearance of insulin is achieved by glomerular filtration and by passage from the postglomerular peritubular circulation into the renal interstitium. In the proximal tubule, filtered insulin binds to the apical membrane and is internalized and degraded while insulin in the interstitium is taken up by receptor-mediated endocytosis and degraded. To… (More)


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