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






From the * Institut für Chirurgische Forschung der Ludwig-Maximilians-Universität München,
81377 München, Germany; the 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
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
Department of Experimental Pathology, Lund University, 221 85 Lund, Sweden
/
) 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.
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