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Molecular and Cell Biological Analyzes of Structure and Function of Drug Transporters in the Intestine and Kidney Proximal Tubule

Research Project

Project/Area Number 06454596
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field Biological pharmacy
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

INUI Ken-ichi  Kyoto University, Department of Pharmacy, Professor, 医学研究科, 教授 (70034030)

Co-Investigator(Kenkyū-buntansha) SAITO Hideyuki  Kyoto University, Department of Pharmacy, Instructor, 医学研究科, 助手 (40225727)
TAKANO Mikihisa  Kyoto University, Department of Pharmacy, Associate Professor, 医学研究科, 助教授 (20211336)
Project Period (FY) 1994 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥7,100,000 (Direct Cost: ¥7,100,000)
Fiscal Year 1995: ¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 1994: ¥4,600,000 (Direct Cost: ¥4,600,000)
KeywordsDrug Transport / beta-Lactam Antibiotics / Peptide Transporter / Intestinal Absorption / Renal Tubular Secretion / Organic Anions / cDNA Cloning / ジペプチド / 輸送担体 / 培養上皮細胞 / クローニング / セファロスポリン / 卵母細胞
Research Abstract

Intestinal absorption and renal tubular secretion of ionic drugs are vectorial transcellular transport processes, which are mediated and regulated by transporters localized at the brush-border or basolateral membranes of these epithelia. In this project, we studied cDNA cloning, structure-function relationship and tissue distribution of drug transporters by using the PCR technique and expression system in Xenopus oocytes and mammalian transfectants.
(1)cDNA cloining, functional characterization and tissue distribution of rat H^+/peptide contransporter : By PCR technique using degenerated primers based on amino acid sequence of the rabbit oligopeptide transporter PEPT1, a cDNA encoding for the rat H^+/peptide cotransporter PEPT1 has been isolated. The rat PEPT1 protein consisted of 710-amino acids with twelve membrane-spanning domains, and showed 77% and 83% amino acid identity with the rabbit and human PEPT1, respectively. Northern blot and reverse transcription-coupled PCR analyzes rev … More ealed that the rat PEPT1 messenger RNA was expressed predominantly in the small intestine, and to a lesser extent in the kidney cortex. By Western blot analysis using anti-rat PEPT1 antibody, rat PEPT1 was detected in duodenum, jejunum and ileum, but not in colon or rectum. Furthermore, rat PEPT1 was demonstrated to be localized at the brush-border membranes of both the small intestinal and renal proximal tubular cells, but not at the basolateral membranes of these epithelia. Transport studies using the oocytes injected with the synthetic rat PEPT1 RNA and the mammalian epithelial cells transfected with the rat PEPT1 cDNA indicated that the rat PEPT1 recognizes and transports orally active beta-lactam antibiotics such as ceftibuten (anion) and cephradine (zwitterion). These findings suggest that the rat PEPT1 mediates absorption of peptide-like drugs in the small intestine and kidney.
cDNA cloning and characterization of kidney-specific organic anion transporter : By PCR technique using degenerated primers based on amino acid sequence of the rat liver organic anion transporter (oatp), a cDNA encoding for a novel rat organic anion transporter (OAT-K1) specifically expressed in the kidney was isolated. Functional studies by cultured epithelial cells transfected with the rat OAT-K1 cDNA demonstrated that OAT-K1 is localized at the basolateral membranes of renal proximal tubule and involved in the renal distribution and secretion of some anionic drugs.
In conclusion, the findings obtained in this project will provide useful information for predicting tissue distribution of drugs and for development drug delivery systems. Less

Report

(3 results)
  • 1995 Annual Research Report   Final Research Report Summary
  • 1994 Annual Research Report
  • Research Products

    (26 results)

All Other

All Publications (26 results)

  • [Publications] S. Matsumoto: "Transport characteristics of ceftibuten, a new cephalosporin antibiotic, via the apical H^+/dipeptide cotransport system in the human intestinal cell line Caco-2: Regulation by cell growth" Pharm. Res.12. 1483-1487 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Y. Tomita: "Transport of oral cephalosporins by the H^+/dipeptide cotransporter and distribution of the transport activity in isolated rabbit intestinal epithelial cells" J. Pharmacol. Exp. Ther.272. 63-69 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] J. Nagai: "Specificity of p-aminohippurate transport system in the OK kidney epithelial cell line" J. Pharmacol. Exp. Ther.274. 1161-1166 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H. Saito: "Cloning and characterization of a rat H^+/peptide cotransporter mediating absorption of β-lactam antibiotics in the intestine and kidney" J. Pharmacol. Exp. Ther.275. 1631-1637 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H. Saito: "Molecular cloning and tissue distribution of rat peptide transporter PEPT2" Biochim. Biophys. Acta. (in press). (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H. Ogihara: "Immuno-localization of H^+/peptide cotransporter in rat digestive tract" Biochem. Biophys. Res. Commun.(in press).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 乾 賢一: "腎臓学-病態生理からのアプローチ,黒川清編" 南江堂, 442 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] S.Matsumoto, H.Saito and K.Inui: "Transport characteristics of ceftibuten, a new cephalosporin antibiotic, via the apical H^+/dipeptide cotransport system in the human intestinal cell line Caco-2 : Regulation by cell growth." Pharm.Res.12. 1483-1487 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Y.Tomita, M.Takano, M.Yasuhara, R.Hori and K.Inui: "Transport of oral cephalosporins by the H^+/dipeptide cotransporter and distribution of the transport activity in isolated rabbit intestinal epithelial cells." J.Pharmacol.Exp.Ther.272. 63-69 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] J.Nagai, M.Takano, K.Hirozane, M.Yasuhara and K,Inui: "Specificity of p-aminohippurate transport system in the OK kidney epithelial cell line." J.Pharmacol.Exp.Ther.274. 1161-1166 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H.Saito, M.Okuda, T.Terada, S.Sasaki and K.Inui: "Cloning and characterization of a rat H^+/peptide cotransporter mediating absorption of beta-lactam antibiotics in the intestine and kidney." J.Pharmacol.Exp.Ther.275. 1631-1637 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H.Saito, T.Terada, M.Okuda, S.Sasaki and K.Inui: "Molecular cloning and tissue distribution of rat peptide transporter PEPT2." Biochim.Biophys.Acta.(in press). (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H.Ogihara, H.Saito, B.-H., Shin, T.Terada, S.Takenoshita, Y.Nagamachi, K.Inui and K.Takata: "Immuno-localization of H^+/peptide cotransporter in rat digestive tract." Biochem.Biophys.Res.Commun.(in press). (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] S. Matsumoto: "Transport characteristics of ceftibuten, a new cephalosporin antibiotic, via the apical H^+/dipeptide cotransport system in the human intestinal cell line Caco-2: Regulation by cell growth" Pharm. Res.12. 1483-1487 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Y. Tomita: "Transport of oral cephalosporins by the H^+/dipeptide cotransporter and distribution of the transport activity in isolated rabbit intestinal epithelial cells" J. Pharmacol. Exp. Ther.272. 63-69 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] J. Nagai: "Specificity of p-aminohippurate transport system in the OK kidney epithelial cell line" J. Pharmacol. Exp. Ther.274. 1161-1166 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] H. Saito: "Cloning and characterization of a rat H^+/peptide cotransporter mediating absorption of β-lactam antibiotics in the intestine and kidney" J. Pharmacol. Exp. Ther.275. 1631-1637 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] H. Saito: "Molecular cloning and tissue distribution of rat peptide transporter PEPT2" Biochim. Biophys. Acta. (in press). (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] H. Ogihara: "Immuno-localization of H^+/peptide cotransporter in rat digestive tract" Biochem. Biophys. Res. Commun.(in press). (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] 乾 賢一: "腎臓学-病態生理からのアプローチ,黒川清編" 南江堂, 442 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] M.Takano: "Bestatin transport in rabbit intestinal brush-border membrane vesicles" Biochem Pharmacol.47. 1089-1090 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] Y.Hashimoto: "Functional evidence for an apical ANP receptor in LLC-PK1 kidney epithelial cells" Eur.J.Pharmacol.268. 443-445 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] S.Matsumoto: "Transcellular transport of oral cephalosporins in human intestinal epithelial cells,Caco-2:Interaction with dipeptide transport systems in apical and basolaterl membranes" J.Pharmacol.Exp.Ther.270. 498-504 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] S.Sasaki: "Cloning,characterization,and chromosomal mapping of human collecting duct water channel" J.Clin.Invest.93. 1250-1256 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] Y.Tomita: "Trsnsport of cephalosporins by the H^+/dipeptide cotransporter and distribution of the transport activity in isolated rabit intestinal epithelial cells" J.Pharmacol.Exp.Ther.272. 63-69 (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] 乾 賢一: "膜学実験シリーズ 第I巻 生体膜編 日本膜学会編" 共立出版, 424 (1994)

    • Related Report
      1994 Annual Research Report

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Published: 1994-04-01   Modified: 2016-04-21  

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