Expression of Cyclooxygenase-2 in Intestinal Epithelial Cells in Response to Invasive Bacterial Infection and its Role of Epithelial Cell Apoptosis

침습성 세균 감염에 의한 사람 장상피세포에서의 Cyclooxygenase-2 발현 및 이의 발현이 상피세포 Apoptosis에 미치는 영향

  • Kim, Jung-Mogg (Department of Microbiology and Institute of Biomedical Science, Hanyang University College of Medicine) ;
  • Kang, Shin-Jae (Department of Microbiology and Institute of Biomedical Science, Hanyang University College of Medicine) ;
  • Cho, Yang-Ja (Department of Microbiology and Institute of Biomedical Science, Hanyang University College of Medicine)
  • 김정목 (한양대학교 의과대학 미생물학교실 및 의과학 연구소) ;
  • 강신재 (한양대학교 의과대학 미생물학교실 및 의과학 연구소) ;
  • 조양자 (한양대학교 의과대학 미생물학교실 및 의과학 연구소)
  • Published : 1999.10.30

Abstract

Invasion of enteric bacteria, such as Salmonella and invasive E. coli, into intestinal epithelial cells induces proinflammatory gene responses and finally epithelial cell apoptosis. In this study, we asked whether invasive bacterial infection of human intestinal epithelial cells could upregulate cyclooxygenase-2 (COX-2) gene expression and whether increased COX-2 expression could influence intestinal epithelial cell apoptosis. Expression of COX-2 mRNA and prostaglandin (PG) $E_2$ production were upregulated in HT-29 colon epithelial cells which were infected with S. dublin or invasive E. coli, as examined by quantitative RT-PCR and radioimmunoassay. Inhibition of COX-2 expression and $PGE_2$ production using NS-398, a specific COX-2 inhibitor, showed a significant increase of epithelial cell apoptosis and caspase-3 activation in HT-29 cells infected with invasive bacteria. However, the addition of valerylsalicylate, a specific COX-1 inhibitor, did not change apoptosis in S. dublin-infected HT-29 cells. These results suggest that up regulated COX-2 expression and $PGE_2$ production in response to invasive bacterial infection could contribute to host defense by inhibiting apoptosis of intestinal epithelial cells.

Keywords

References

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