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Blood, 15 December 2003, Vol. 102, No. 13, pp. 4377-4383. Prepublished online as a Blood First Edition Paper on August 14, 2003; DOI 10.1182/blood-2002-12-3872.
HEMOSTASIS, THROMBOSIS, AND VASCULAR BIOLOGY Monocyte-expressed urokinase inhibits vascular smooth muscle cell growth by activating Stat1From the Charité-Franz Volhard Clinic and Max Delbrück Center for Molecular Medicine, Humboldt University Berlin; and the Hannover Medical School, Germany.
After vascular injury, a remodeling process occurs that features leukocyte migration and infiltration. Loss of endothelial integrity allows the leukocytes to interact with vascular smooth muscle cells (VSMCs) and to elicit "marching orders"; however, the signaling processes are poorly understood. We found that human monocytes inhibit VSMC proliferation and induce a migratory potential. The monocytes signal the VSMCs through the urokinase-type plasminogen activator (uPA). The VSMC uPA receptor (uPAR) receives the signal and activates the transcription factor Stat1 that, in turn, mediates the antiproliferative effects. These results provide the first evidence that monocytes signal VSMCs by mechanisms involving the fibrinolytic system, and they imply an important link between the uPA/uPAR-related signaling machinery and human vascular disease. (Blood. 2003;102: 4377-4383)
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