Endothelin-1 increases expression of cyclooxygenase-2 and production of interlukin-8 in hunan pulmonary epithelial cells

Hong Peng, Ping Chen, Ying Cai, Yan Chen, Qing hua Wu, Yun Li, Rui Zhou, Xiang Fang

Research output: Contribution to journalArticle

13 Scopus citations

Abstract

Inducible cyclooxygenase (COX-2) and inflammatory cytokines play important roles in inflammatory processes of chronic obstructive pulmonary disease (COPD). Endothelin-1 (ET-1) might be also involved in the pathophysilogical processes in COPD. In the present study, we determined whether ET-1 could regulate the expression of COX-2 and alter the production of interleukin-8 (IL-8) in human pulmonary epithelial cells (A549). Induced sputum samples were collected from 13 stable COPD patients and 14 healthy subjects. The COX-2 protein, ET-1, PGE2 and IL-8 in these sputum samples were analyzed. A549 cells were incubated with ET-1 in the presence or absence of celecoxib, a selective COX-2 inhibitor. The expression of COX-2 protein in the cell and the amounts of PGE2 and IL-8 in the medium were measured. The levels of COX-2 protein, ET-1, PGE2 and IL-8 were significantly increased in induced sputum from COPD patients when compared to healthy subjects. ET-1 increased the expression of COX-2 protein, as well as the production of PGE2 in A549 cells. Increased production of PGE2 was inhibited by celecoxib. ET-1 also increased the production of IL-8. Interestingly, ET-1-induced production of IL-8 was also inhibited by celecoxib. These findings indicate that ET-1 plays important roles in regulating COX-2 expression and production of IL-8 in A549 cells. ET-1 mediated production of IL-8 is likely through a COX-2-dependent mechanism.

Original languageEnglish (US)
Pages (from-to)419-424
Number of pages6
JournalPeptides
Volume29
Issue number3
DOIs
StatePublished - Mar 2008

Keywords

  • Chronic obstructive pulmonary disease
  • Cyclooxygenase-2
  • Endothelin-1
  • Interleukin-8
  • Prostaglandin E

ASJC Scopus subject areas

  • Biochemistry
  • Physiology
  • Endocrinology
  • Cellular and Molecular Neuroscience

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