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Open Access

The role of prostacyclin in the interaction of endothelial cells and eosinophil granulocytes

  • Viktória Kónya1,
  • Eva M Sturm1,
  • Zoltán Bálint2,
  • Martin Krenn3 and
  • Ákos Heinemann1Email author
BMC Pharmacology20088(Suppl 1):A13

https://doi.org/10.1186/1471-2210-8-S1-A13

Published: 5 November 2008

Background

Enhanced eosinophil migration from the blood into the tissue is a hallmark of bronchial asthma and other allergic diseases. So far, very little is known how the function of vascular endothelial cells is modulated in this process. Our aim was to characterize the role of prostacyclin (PGI2) in endothelial function and endothelium-eosinophil interaction.

Materials and methods

Cell interaction studies, like adhesion and transmigration assays, were performed with freshly isolated human blood eosinophils on confluent layers of human lung microvascular endothelial cells. The changes in endothelial monolayer integrity were detected by means of transendothelial electrical resistance and by fluorescence microscopy.

Results

Under basal conditions, the major prostaglandin released by human microvascular endothelial cells is PGI2. Exogenous PGI2 markedly attenuated the migration of isolated eosinophils through cell-free filters. This effect was prevented by the IP receptor antagonist Cay10441 and the adenylyl cyclase inhibitor SQ29548. Treatment of endothelial cells with diclofenac, a non-selective COX inhibitor, abolished the PGI2 production which was accompanied by enhanced eosinophil adhesion to endothelial monolayers. Similarly, the transmigration of eosinophils through endothelial monolayers was enhanced by diclofenac. The diclofenac treatment itself decreased the electrical resistance of endothelial monolayers and compromised the intercellular cell junctions as visualized by VE-cadherin staining.

Conclusion

Based on these observations, we conclude that the basal synthesis of PGI2 by endothelial cells can down-regulate the endothelial adhesion and transmigration of eosinophils. Furthermore, endogenous PGI2 seems to be important for the maintenance of endothelium barrier function. These results suggest that PGI2 may have a protective role in the case of allergic inflammation and provide a novel explanation for previous observations that IP knock-out mice show enhanced eosinophilic inflammation in response to allergen [1].

Authors’ Affiliations

(1)
Institute of Experimental and Clinical Pharmacology, Medical University of Graz
(2)
Department of Anaesthesiology, Medical University of Graz
(3)
Institute of Pharmacology and Toxicology, University of Graz

References

  1. Takahashi Y, Tokuoka S, Masuda T, Hirano Y, Nagao M, Tanaka H, Inagaki N, Narumiya S, Nagai H: Augmentation of allergic inflammation in prostanoid IP receptor deficient mice. Br J Pharmacol. 2002, 137: 315-322. 10.1038/sj.bjp.0704872.PubMed CentralView ArticlePubMedGoogle Scholar

Copyright

© Kónya et al; licensee BioMed Central Ltd. 2008

This article is published under license to BioMed Central Ltd.

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