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Am J Physiol Heart Circ Physiol 279: H817-H824, 2000;
0363-6135/00 $5.00
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Vol. 279, Issue 2, H817-H824, August 2000

Lack of hypoxic stimulation of VEGF secretion from neutrophils and platelets

Petra Koehne1, Carsten Willam2, Evelyn Strauss1, Ralf Schindler2, Kai-Uwe Eckardt2, and Christoph Bührer1

Departments of 1 Neonatology and 2 Nephrology and Medical Intensive Care, Charité, Campus Virchow-Klinikum, Humboldt University, D-13353 Berlin, Germany

Low oxygen (O2) is the key stimulus for expression of vascular endothelial growth factor (VEGF) in several adherent cells. Whether hypoxia also directs the release of VEGF protein from neutrophils (polymorphonuclear neutrophils; PMN) and platelets has not been investigated. We therefore compared VEGF release of platelets, PMN, and human vascular smooth muscle cells (HSMC) in response to hypoxia with that to activators of cellular degranulation. In contrast to HSMC, VEGF release from PMN and platelets or VEGF mRNA expression in PMN was not stimulated under hypoxic conditions (1% O2). Hypo- or hyperthermia and acidosis, other conditions potentially associated with ischemic and inflammatory tissue injury, also did not stimulate VEGF secretion from PMN. However, stimulation of platelets with thrombin and of PMN with phorbol 12-myristate 13-acetate induced a time-dependent release of VEGF, peaking after 30 and 60 min, respectively. This was blocked by the degranulation inhibitor pentoxifylline but not by the protein-synthesis inhibitor cycloheximide. We conclude that rapid release of VEGF from platelets and PMN may occur independently of oxygenation during inflammation and hemostasis.

vascular endothelial growth factor; hypoxia; angiogenesis; intracellular vascular endothelial growth factor pool


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