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Effects of Clostridium perfringens enterotoxin via claudin-4 on normal human pancreatic duct epithelial cells and cancer cells

Hiroshi Yamaguchi
  • Sapporo Medical University School of Medicine
  • :
/ Takashi Kojima
  • Sapporo Medical University School of Medicine, S1 W17
  • :
/ Tatsuya Ito
  • Sapporo Medical University School of Medicine
  • Sapporo Medical University School of Medicine, S1 W17
  • :
/ Daisuke Kyuno
  • Sapporo Medical University School of Medicine
  • Sapporo Medical University School of Medicine, S1 W17
  • :
/ Yasutoshi Kimura
  • Sapporo Medical University School of Medicine
  • :
/ Masafumi Imamura
  • Sapporo Medical University School of Medicine
  • :
/ Koichi Hirata
  • Sapporo Medical University School of Medicine
  • :
/ Norimasa Sawada
  • Sapporo Medical University School of Medicine, S1 W17
  • :
Published Online: 2011-07-23 | DOI: https://doi.org/10.2478/s11658-011-0014-z


The tight junction protein claudin-4 is frequently overexpressed in pancreatic cancer, and is also a receptor for Clostridium perfringens enterotoxin (CPE). The cytotoxic effects of CPE are thought to be useful as a novel therapeutic tool for pancreatic cancer. However, the responses to CPE via claudin-4 remain unknown in normal human pancreatic duct epithelial (HPDE) cells. We introduced the human telomerase reverse transcriptase (hTERT) gene into HPDE cells in primary culture as a model of normal HPDE cells in vitro. hTERT-HPDE cells treated with or without 10% FBS and pancreatic cancer cell lines PANC-1, BXPC3, HPAF-II and HPAC were treated with CPE. In Western blotting, the expression of claudin-4 protein in hTERT-HPDE cells treated with 10% FBS was as high as it was in all of the pancreatic cancer cell lines. In hTERT-HPDE cells with or without 10% FBS, cytotoxicity was not observed at any concentration of CPE, whereas in all pancreatic cancer cell lines, CPE had a dose-dependent cytotoxic effect. In hTERT-HPDE cells with 10% FBS, claudin-4 was localized in the apical-most regions, where there are tight junction areas, in which in all pancreatic cancer cell lines claudin-4 was found not only in the apical-most regions but also at basolateral membranes. In hTERT-HPDE cells with 10% FBS after treatment with CPE, downregulation of barrier function and claudin-4 expression at the membranes was observed. In HPAC cells, the sensitivity to CPE was significantly decreased by knockdown of claudin-4 expression using siRNA compared to the control. These findings suggest that, in normal HPDE cells, the lack of toxicity of CPE was probably due to the localization of claudin-4, which is different from that of pancreatic cancer cells. hTERT-HPDE cells in this culture system may be a useful model of normal HPDE cells not only for physiological regulation of claudin-4 expression but also for developing safer and more effective therapeutic methods targeting claudin-4 in pancreatic cancer.

Keywords: Tight junction; Claudin-4; CPE; Human pancreatic duct epithelial cells; Human pancreatic cancer cells

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Published Online: 2011-07-23

Published in Print: 2011-09-01

Citation Information: Cellular and Molecular Biology Letters. Volume 16, Issue 3, Pages 385–397, ISSN (Online) 1689-1392, DOI: https://doi.org/10.2478/s11658-011-0014-z, July 2011

© 2011 Versita Warsaw. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. (CC BY-NC-ND 3.0)

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