Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Editor

Personal info

View

About

Terms

Javascript disabled

Please enable Javascript support in your browser to use this application.

Instructions on how to enable JavaScript on different browsers can be found here: http://www.google.com/support/bin/answer.py?answer=23852.

[edit this page]

de Groot, P.G. et al.

Thrombin-induced release of von Willebrand factor from endothelial cells is mediated by phospholipid methylation. Prostacyclin synthesis is independent of phospholipid methylation.

The biochemical events that lead to thrombin-stimulated release of von Willebrand factor and prostacyclin synthesis in cultured endothelial cells are examined. Treatment of human umbilical vein endothelial cells with thrombin results in an instantaneous increase in phospholipid methylation which can be blocked by 3-deazaadenosine, a methyltransferase inhibitor. 3-Deazaadenosine also blocks the thrombin-induced Ca2+ influx into endothelial cells and the release of von Willebrand factor, indicating that these processes are coupled. The phorbol ester 4 beta-phorbol 12-myristate 13-acetate (PMA) and the Ca2+ ionophore A23187 both bypass the phospholipid methylation and directly stimulate Ca2+ influx and von Willebrand factor release. In contrast to the stimulus-induced von Willebrand factor release, the thrombin-induced prostacyclin synthesis cannot be blocked by 3-deazaadenosine. Similarly, incubation of endothelial cells with EDTA has no influence on the thrombin-induced prostacyclin synthesis, and PMA has no stimulatory effect on prostacyclin synthesis. These observations indicate that thrombin induces different metabolic responses in endothelial cells: phospholipid methylation followed by a Ca2+ influx, which subsequently leads to release of von Willebrand factor, and liberation of arachidonic acid from phospholipids for prostacyclin formation, which is independent of phospholipid methylation and Ca2+ influx.[1]

References

Thrombin-induced release of von Willebrand factor from endothelial cells is mediated by phospholipid methylation. Prostacyclin synthesis is independent of phospholipid methylation. de Groot, P.G., Gonsalves, M.D., Loesberg, C., van Buul-Wortelboer, M.F., van Aken, W.G., van Mourik, J.A. J. Biol. Chem. (1984) [Pubmed]

Annotations and hyperlinks in this abstract are from individual authors of WikiGenes or automatically generated by the WikiGenes Data Mining Engine. The abstract is from MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.About WikiGenes Open Access Licence Privacy Policy Terms of Use apsburg

The world's first wiki where authorship really matters (Nature Genetics, 2008). Due credit and reputation for authors. Imagine a global collaborative knowledge base for original thoughts. Search thousands of articles and collaborate with scientists around the globe.