Renal Filtration, Absorption and Catabolism of Human Alpha Interferon

Abstract
The renal handling of human interferon-.alpha. [IFN-.alpha.] has been evaluated in an isolated and perfused rabbit kidney. IFN-.alpha. disappears from plasma with a t1/2 [half-life] of 81 min and the fractional turnover rate is 0.84%/min. About 47 molecules of IFN-.alpha. are filtrated with 100 molecules of creatinine but most of the IFN is absorbed by tubular cells. This is the 1st report showing that human IFN-.alpha. is filtrated by the kidney, is largely absorbed, most probably catabolized within tubular epithelium and excreted in negligible amounts with the urine.

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