title: Establishment of novel prediction system of intestinal absorption in humans using human intestinal tissues.
abstract: The objective of this study was to establish a novel prediction system of drug absorption in humans by utilizing human intestinal tissues. Based on the transport index (TI), a newly defined parameter, calculated by taking account of the change in drug concentrations because of precipitation on the apical side and the amounts accumulated in the tissue and transported to the basal side, the absorbability of drugs in rank order as well as the fraction of dose absorbed (Fa) in humans were estimated. Human intestinal tissues taken from ulcerative colitis or Crohn's disease patients were mounted in a mini-Ussing chamber and transport studies were performed to evaluate the permeation of drugs, including FD-4, a very low permeable marker, atenolol, a low permeable marker, and metoprolol, a high permeable marker. Although apparent permeability coefficients calculated by the conventional equation did not reflect human Fa values for FD-4, atenolol, and metoprolol, TI values were well correlated with Fa values, which are described by 100 · [1 - e (- f · (TI - α)) ]. Based on this equation, Fa values in humans for other test drugs were predicted successfully, indicating that our new system utilizing human intestinal tissues would be valuable for predicting oral drug absorption in humans.
authors.affiliation: Division of Gastroenterology, Department of Internal Medicine Keio University School of Medicine, Shinanomachi 35 Shinjyuku-ku, Tokyo 160-8582, Japan. Miyake.Masateru@otsuka.jp
authors.forename: Masateru
authors.initials: M
authors.lastname: Miyake
authors.forename: Hajime
authors.initials: H
authors.lastname: Toguchi
authors.forename: Toru
authors.initials: T
authors.lastname: Nishibayashi
authors.forename: Kazutaka
authors.initials: K
authors.lastname: Higaki
authors.forename: Akira
authors.initials: A
authors.lastname: Sugita
authors.forename: Kazutaka
authors.initials: K
authors.lastname: Koganei
authors.forename: Nobuhiko
authors.initials: N
authors.lastname: Kamada
authors.forename: Mina T
authors.initials: MT
authors.lastname: Kitazume
authors.forename: Tadakazu
authors.initials: T
authors.lastname: Hisamatsu
authors.forename: Toshiro
authors.initials: T
authors.lastname: Sato
authors.forename: Susumu
authors.initials: S
authors.lastname: Okamoto
authors.forename: Takanori
authors.initials: T
authors.lastname: Kanai
authors.forename: Toshifumi
authors.initials: T
authors.lastname: Hibi
mesh_terms: D058671:Adrenergic beta-1 Receptor Antagonists / Q000493:pharmacokinetics*; D000328:Adult; D000368:Aged; D000465:Algorithms; D001262:Atenolol / Q000493:pharmacokinetics*; D005260:Female; D006801:Humans; D007093:Imidazoles / Q000493:pharmacokinetics*; D007408:Intestinal Absorption; D007413:Intestinal Mucosa / Q000378:metabolism*; D008297:Male; D008790:Metoprolol / Q000493:pharmacokinetics*; D008875:Middle Aged; D008954:Models, Biological; D010539:Permeability; D010647:Phenyl Ethers / Q000493:pharmacokinetics*; D055815:Young Adult
chemical_list: D058671:Adrenergic beta-1 Receptor Antagonists; D007093:Imidazoles; C549414:N-3-trifluorophenoxy-3-phenylpropaneimidazole; D010647:Phenyl Ethers; D001262:Atenolol; D008790:Metoprolol
keywords: human absorption; human tissues; mini-Ussing chamber; prediction; transport index (TI)