In Vitro Study on the Transport of Zinc across Intestinal Epithelial Cells Using Caco-2 Monolayers and Isolated Rat Intestinal Membranes

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概要

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• The variety of physiologic and biologic functions of zinc is fascinating and could be applicable to medicine. Our previous studies demonstrated that the absorption of zinc after oral administration to rats is dose-dependent. In order to clarify the detailed mechanism of the dose-dependent in vivo absorption, the transport of zinc across intestinal epithelial cells was investigated using Caco-2 monolayers and isolated rat intestinal membranes. The permeation of zinc across Caco-2 monolayers is concentration-dependent, and both saturable and nonsaturable components are involved. The Michaelis constant and maximum transport rate for saturable transport are 11.7 μM and 31.8 pmol min−1 cm−2, respectively; the permeability coefficient for nonsaturable trasnport is 2.37×10−6 cm s−1. These parameters for permeation across membranes isolated from duodenum, ileum, and jejunum of rats are similar with those of Caco-2 cells. The comparison of the parameters for permeation across isolated intestinal membrane suggests that the major site of intestinal zinc absorption in rats is the duodenum. The maximum rate of zinc transport across the isolated intestinal membrane (Vmax) shows no correlation with mRNA expression of ZIP4, ZIP5 or ZnT1 in rats, but shows an inverse correlation with that of metallothioneins (MTs). This finding may be partly explained by the buffering role of metallothionein in intestinal absorption. The saturable transport of zinc is not simply determined only by the influx transporter, ZIP4, since three influx and efflux transporters are involved in the transport of zinc.

著者

• Okamoto Hiroki

  Department Of Microbiology Toho University School Of Medicine

• Yasui Hiroyuki

  Department Of Analytical And Bioinorganic Chemistry Kyoto Pharmaceutical University

• YOSHIKAWA Yutaka

  Department of Analytical and Bioinorganic Chemistry, Kyoto Pharmaceutical University

• Furubayashi Tomoyuki

  School Of Pharmacy Shujitsu University

• NAGAI Miho

  Department of Nephrology, Tokyo Medical University Ibaraki Medical Center

• Yasuno Tohru

  Departments Of Pharmacotogy Graduate School Of Pharmaceutical Sciences Kyoto University

• Sakane Toshiyasu

  Department of Biopharmaceutics, Kyoto Pharmaceutical University

• Katsumi Hidemasa

  Department Of Biopharmaceutics Kyoto Pharmaceutical University

• Yamamoto Takanori

  Department Of Civil Engineering College Of Industrial Technology Nihon University

• Yoshikawa Yutaka

  Department Of Analytical And Bioinorganic Chemistry Kyoto Pharmaceutical University

• Yamamoto Akira

  Department Of Anatomy School Of Medicine University Of Tokushuma

• Kimura Shunsuke

  Department of Biopharmaceutics, Kyoto Pharmaceutical University

• Nagano Kozue

  Department of Biopharmaceutics, Kyoto Pharmaceutical University

• Yamamoto Takanori

  Department Of Advanced Bioscience Kinki University

• Yamamoto Akira

  Department Of Anatomy School Of Medicine University Of Tokushima

• Okamoto Hiroki

  Department of Biopharmaceutics, Kyoto Pharmaceutical University

• Yamamoto Takanori

  Department of Biopharmaceutics, Kyoto Pharmaceutical University

• Furubayashi Tomoyuki

  School of Pharmacy, Shujitsu University

• Nagai Miho

  Department of Biopharmaceutics, Kyoto Pharmaceutical University

• Yasuno Tohru

  Department of Biopharmaceutics, Kyoto Pharmaceutical University

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