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Aim The objective of the study is to evaluate the mechanism behind alterations in passive and active transport of drugs in the presence of basolaterally applied extracellular protein using the Caco-2 cell model. Methods The permeation across Caco-2 monolayers of two groups of compounds, transported either solely by passive diffusion or partly also by active transport in the secretory direction, was...
The contribution of the intestine to the nonlinear absorption of celiprolol in the rat was studied. After intravenous administration of 14C-celiprolol to bile duct-cannulated rats, approximately 9% of the dose was found to be associated with intestinal tissue and its contents. Microhistoautoradiography of frozen intestinal sections showed a time-dependent secretion of celiprolol from the blood into...
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