A pharmacokinetic model of intravenously administered hyaluronan in sheep.

作者: Lena Lebel , J. Robert E. Fraser , Wayne S. Kimpton , Johan Gabrielsson , Bengt Gerdin

DOI: 10.1023/A:1015982204926

关键词: MetabolismExtraction ratioPharmacokineticsChromatographyHyaluronic acidReceptorMichaelis–Menten kineticsLymphBiochemistryChemistryMicrogram

摘要: Hyaluronan (HA: hyaluronic acid) is produced in the interstitium and reaches blood circulation through lymph. It rapidly eliminated by means of specific receptors on liver endothelium. The elimination characteristics intravenously administered HA were studied 10 conscious sheep at normal plasma concentration injection a 3H-labeled tracer very high an i.v. infusion unlabeled simultaneous dose HA. At (0.12 +/- 0.05 microgram/ml; range, 0.072-0.228 microgram/ml), apparent T 1/2 3H-HA was 5.3 1.1 min (range, 3.3-6.5 min). higher concentrations 1.83-3.35 micrograms/ml), considerably prolonged 18.2-43.5 A one-compartment, nonlinear model fitted to data obtained from bolus-infusion study Michaelis-Menten constant, Km, 0.12 0.04 microgram/ml, indicating that deviation linear kinetics will occur when exceeded. Vmax 0.062 0.009 microgram/ml/min. Three-dimensional surface plots showed total hepatic flow influence metabolic clearance, extraction ratio, turnover, injected hyaluronan. There correlation between as measured calculated (r = 0.96).

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