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J. Exp. Med., Volume 189, Number 8, April 19, 1999 1255-1264

Increased Adhesion and Aggregation of Platelets Lacking Cyclic Guanosine 3',5'-Monophosphate Kinase I

By Steffen Massberg,* Matthias Sausbier,Dagger Peter Klatt,Dagger Markus Bauer,§ Alexander Pfeifer,Dagger Wolfgang Siess,§ Reinhard Fässler,parallel Peter Ruth,Dagger Fritz Krombach,* and Franz HofmannDagger

From the * Institut für Chirurgische Forschung der Ludwig-Maximilians-Universität München, 81377 München, Germany; the Dagger  Institut für Pharmakologie und Toxikologie der Technische Universität München, 80802 München, Germany; the § Institut für Prophylaxe und Epidemiologie der Kreislaufkrankheiten, Klinikum Innenstadt, Universität München, 80336 München, Germany; and the parallel  Department of Experimental Pathology, Lund University, 221 85 Lund, Sweden

Atherosclerotic vascular lesions are considered to be a major cause of ischemic diseases, including myocardial infarction and stroke. Platelet adhesion and aggregation during ischemia-reperfusion are thought to be the initial steps leading to remodeling and reocclusion of the postischemic vasculature. Nitric oxide (NO) inhibits platelet aggregation and smooth muscle proliferation. A major downstream target of NO is cyclic guanosine 3',5'-monophosphate kinase I (cGKI). To test the intravascular significance of the NO/cGKI signaling pathway in vivo, we have studied platelet-endothelial cell and platelet-platelet interactions during ischemia/reperfusion using cGKI-deficient (cGKI-/-) mice. Platelet cGKI but not endothelial or smooth muscle cGKI is essential to prevent intravascular adhesion and aggregation of platelets after ischemia. The defect in platelet cGKI is not compensated by the cAMP/cAMP kinase pathway supporting the essential role of cGKI in prevention of ischemia-induced platelet adhesion and aggregation.

Key words: fluorescence microscopy;  endothelial cell;  microcirculation;  nitric oxide;  cyclic guanosine 3',5'-monophosphate-dependent protein kinase


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