Journal of Gastroenterology

, Volume 37, Issue 3, pp 186–193

Effects of cyclooxygenase-2 inhibitor NS-398 on APC and c-myc expression in rat colon carcinogenesis induced by azoxymethane

  • Yosuke Kishimoto
  • Kazuo Yashima
  • Tsuyoshi Morisawa
  • Goshi Shiota
  • Hironaka Kawasaki
  • Junichi Hasegawa
Article

DOI: 10.1007/s005350200019

Cite this article as:
Kishimoto, Y., Yashima, K., Morisawa, T. et al. J Gastroenterol (2002) 37: 186. doi:10.1007/s005350200019

Background

Nonsteroidal anti-inflammatory drugs (NSAIDs) have been reported to protect against the development of colon cancer; however, the mechanism(s) by which NSAIDs exert their effects is still unclear. The aim of this study was to examine the effects of NSAIDs on the expression of the tumor suppressor APC gene and the c-myc oncogene in the colons of rats treated with a colon-specific carcinogen, azoxymethane (AOM). Methods. Gene expression levels were estimated by a reverse transcription (RT)-competitive polymerase chain reaction (PCR) method. Results. The group of rats simultaneously administered AOM and NS-398, a cyclooxygenase (COX)-2 inhibitor, showed a significant reduction in the number of preneoplastic lesions of colon cancer compared with that in the group of rats treated with AOM alone. Furthermore, the APC expression level in the group of rats treated with both AOM and NS-398 was significantly greater than that in the group of rats treated with AOM alone; this result for APC gene expression was reconfirmed by the immunohistochemical staining of APC protein. In addition, c-myc mRNA expression was clearly decreased in the group of rats treated with both AOM and NS-398 compared with the level in the group of rats treated with AOM alone. Conclusions. Our data thus indicate that NS-398 causes an increase in APC expression and a decrease in c-myc expression.

Key words: COX-2 APC c-myc nonsteroidal anti-inflammatory drug aberrant crypt foci 

Copyright information

© Springer-Verlag Tokyo 2002

Authors and Affiliations

  • Yosuke Kishimoto
    • 1
  • Kazuo Yashima
    • 2
  • Tsuyoshi Morisawa
    • 1
  • Goshi Shiota
    • 2
  • Hironaka Kawasaki
    • 2
  • Junichi Hasegawa
    • 1
  1. 1.Department of Clinical Pharmacology, Faculty of Medicine, Tottori University, 86 Nishicho, Yonago 683-8503Japan
  2. 2.Second Department of Internal Medicine, Faculty of Medicine, Tottori University, Yonago, JapanJapan

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