title: Activation of P2Y receptor enhances high-molecular compound absorption from rat ileum.
abstract: While there are no reports concerning the effects of extracellular nucleotides on the intestinal absorption of drugs, it is well known that extracellular nucleotides are important regulators of intestinal epithelial ion transport. This report using fluorescein isothiocyanate dextran 4000 (FD-4) as the model compound is the first to investigate the effects of purine nucleotides on absorption of poorly absorbed drugs from intestine. ATP enhanced the absorption of FD-4 from rat ileum in a concentration-dependent manner. ADP also enhanced the absorption of FD-4. Other purine nucleotides (adenosine, AMP, UTP and UDP) did not show an absorption-enhancing effect. The absorption-enhancing effect by ATP was inhibited by suramin and pyridoxalphosphate-6-azophenyl-2',4'-disulfonate (PPADS), which are known P2 receptor antagonists. Additionally, 2-methylthio ATP (a P2Y receptor agonist) enhanced the absorption of FD-4, but alpha,beta-methylene ATP (a P2X receptor agonist) did not. These findings suggest that activation of the P2Y receptor may improve the absorption of water-soluble and high-molecular compounds from the ileum.
authors.affiliation: Departments of Pharmaceutics and Pharmacology, School of Pharmaceutical Sciences, Mukogawa Women's University, 11-68 Koshien, Kyuban-cho, Nishinomiya 663-8179, Japan.
authors.forename: Natsumi
authors.initials: N
authors.lastname: Kinoshita
authors.forename: Tomoko
authors.initials: T
authors.lastname: Takahashi
authors.forename: Shoko
authors.initials: S
authors.lastname: Tada
authors.forename: Kazumasa
authors.initials: K
authors.lastname: Shinozuka
authors.forename: Nobuyasu
authors.initials: N
authors.lastname: Mizuno
authors.forename: Koichi
authors.initials: K
authors.lastname: Takahashi
mesh_terms: D000255:Adenosine Triphosphate / Q000031:analogs & derivatives / Q000494:pharmacology; D000818:Animals; D003911:Dextrans / Q000097:blood / Q000493:pharmacokinetics*; D016650:Fluorescein-5-isothiocyanate / Q000031:analogs & derivatives* / Q000493:pharmacokinetics; D007082:Ileum / Q000187:drug effects / Q000378:metabolism*; D007408:Intestinal Absorption / Q000187:drug effects; D008297:Male; D009711:Nucleotides / Q000494:pharmacology*; D058910:Purinergic P2 Receptor Agonists; D058919:Purinergic P2 Receptor Antagonists; D011732:Pyridoxal Phosphate / Q000031:analogs & derivatives / Q000494:pharmacology; D051381:Rats; D017208:Rats, Wistar; D018048:Receptors, Purinergic P2 / Q000378:metabolism*; D013498:Suramin / Q000494:pharmacology; D013873:Thionucleotides / Q000494:pharmacology
chemical_list: D003911:Dextrans; D009711:Nucleotides; D058910:Purinergic P2 Receptor Agonists; D058919:Purinergic P2 Receptor Antagonists; D018048:Receptors, Purinergic P2; D013873:Thionucleotides; C015219:fluorescein isothiocyanate dextran; C077792:pyridoxal phosphate-6-azophenyl-2',4'-disulfonic acid; D011732:Pyridoxal Phosphate; D013498:Suramin; D000255:Adenosine Triphosphate; D016650:Fluorescein-5-isothiocyanate; C002630:alpha,beta-methyleneadenosine 5'-triphosphate; C008501:2-methylthio-ATP