4.7 Article

PGE2 maintains the tone of the guinea pig trachea through a balance between activation of contractile EP1 receptors and relaxant EP2 receptors

期刊

BRITISH JOURNAL OF PHARMACOLOGY
卷 168, 期 4, 页码 794-806

出版社

WILEY
DOI: 10.1111/j.1476-5381.2012.02189.x

关键词

PGE(2); airway smooth muscle; trachea; spontaneous tone; EP1; EP2; EP3; EP4; guinea pig

资金

  1. Swedish Medical Research Council
  2. Swedish Heart-Lung Foundation
  3. Swedish Society of Medicine
  4. Vinnova Chronic Inflammation - Diagnostic and Therapy (CIDaT)
  5. Swedish Foundation for Strategic Research (SSF)
  6. Swedish Society for Medical Research
  7. Stockholm County Council Research Funds (ALF)
  8. Karolinska Institutet

向作者/读者索取更多资源

BACKGROUND AND PURPOSE The guinea pig trachea (GPT) is commonly used in airway pharmacology. The aim of this study was to define the expression and function of EP receptors for PGE(2) in GPT as there has been ambiguity concerning their role. EXPERIMENTAL APPROACH Expression of mRNA for EP receptors and key enzymes in the PGE(2) pathway were assessed by real-time PCR using species-specific primers. Functional studies of GPT were performed in tissue organ baths. KEY RESULTS Expression of mRNA for the four EP receptors was found in airway smooth muscle. PGE(2) displayed a bell-shaped concentration-response curve, where the initial contraction was inhibited by the EP1 receptor antagonist ONO-8130 and the subsequent relaxation by the EP2 receptor antagonist PF-04418948. Neither EP3 (ONO-AE5-599) nor EP4 (ONO-AE3-208) selective receptor antagonists affected the response to PGE(2). Expression of COX-2 was greater than COX-1 in GPT, and the spontaneous tone was most effectively abolished by selective COX-2 inhibitors. Furthermore, ONO-8130 and a specific PGE(2) antibody eliminated the spontaneous tone, whereas the EP2 antagonist PF-04418948 increased it. Antagonists of other prostanoid receptors had no effect on basal tension. The relaxant EP2 response to PGE(2) was maintained after long-term culture, whereas the contractile EP1 response showed homologous desensitization to PGE(2), which was prevented by COX-inhibitors. CONCLUSIONS AND IMPLICATIONS Endogenous PGE(2), synthesized predominantly by COX-2, maintains the spontaneous tone of GPT by a balance between contractile EP1 receptors and relaxant EP2 receptors. The model may be used to study interactions between EP receptors.

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