PMID: 3745265Sep 1, 1986Paper

Alpha-thrombin induces release of platelet-derived growth factor-like molecule(s) by cultured human endothelial cells

The Journal of Cell Biology
J M HarlanD F Bowen-Pope

Abstract

Cultured endothelial cells secrete a platelet-derived growth factor-like molecule (PDGFc). We examined the effects of purified human alpha-thrombin on the production of PDGFc in cultures of human umbilical vein endothelial cells (HUVE) using a specific radioreceptor assay for PDGF. Addition of physiologically relevant concentrations of alpha-thrombin (0.1 to 10 U/ml) induced a time- and dose-dependent increase in the release of PDGFc into the culture medium. Significant stimulation of PDGFc release was observed as early as 1.5 h after addition of alpha-thrombin (10 U/ml) with a 4.9 +/- 1.1 fold increase at 24 h (mean +/- SEM of nine experiments, P less than 0.01). alpha-Thrombin treatment of HUVE did not affect cell viability as assessed by trypan blue dye exclusion. The receptor binding of PDGFc secreted by HUVE in response to alpha-thrombin was inhibited by monospecific antibody to purified human PDGF indicating that the molecule(s) is closely related to PDGF. alpha-Thrombin inactivated with diisopropylfluorophosphate was without stimulatory effect. Lysis of HUVE by repeated cycles of freeze/thaw released minimal PDGFc (less than 0.3 ng per 10(6) cells) compared to levels of PDGFc released into supernatant medium in response ...Continue Reading

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