Abstract
Therapeutics in end-stage renal disease (ESRD) patients undergoing haemodialysis (HD) has to consider potential drug clearance during the dialysis procedure. Pegylated interferon-alpha (PEG-IFN-alpha), a middle-size protein drug active against viral hepatitis, allows convenient once-weekly dosing due to prolonged plasma half-life. To investigate the impact of permeability and dialyser pore size on PEG-IFN-alpha blood levels during experimental HD. Polymethylmetacrylate (PMMA) membrane 1.6 m2 dialysers with three different permeabilities/pore sizes were selected. A 40 kDa PEG-IFN-alpha2a (PEGASYS) was not cleared (< 5%) through low-flux/small pore size (25 A;B3A) and high-flux/middle-large pore size (60 A;BKP) dialysers, and was partially (approximately 15%) through intermediate permeability/large pore size (100 A;BKF) dialysers. In contrast, unmodified 17 kDa IFN-alpha2a(Roferon-A) was removed (65%-95%) through BKP or BKF, but not B3A, PMMA dialysers. Moreover, 12 kDa PEG-IFN-alpha2b(PegIntron) was cleared (40%-80%) through PMMA dialysers with pore sizes > or = 60 angstroms. When B3A or BKP were replaced every hour PEG-IFN-alpha2a plasma levels remained constant throughout three experimental-HD-sessions, but PEG-IFN-alpha2b was...Continue Reading
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