PMID: 2102088Dec 1, 1990Paper

The endothelin peptides ET-1, ET-2, ET-3 and sarafotoxin S6b are co-mitogenic with platelet-derived growth factor for vascular smooth muscle cells

Atherosclerosis
P L WeissbergJ C Metcalfe

Abstract

We have investigated whether any of the three isoforms of endothelin (ET) ET-1, ET-2 and ET-3 or the structurally similar peptide sarafotoxin S6b is mitogenic on its own for rat vascular smooth muscle cells in culture. DNA synthesis was determined by a peroxidase-linked double antibody technique to detect bromodeoxyuridine incorporation into the nucleus and stained nuclei were counted by image analysis. None of the ET peptides or sarafotoxin S6b (up to 100 nM) was capable of initiating DNA synthesis in the absence of platelet derived growth factor (PDGF) or fetal calf serum. All the peptides potentiated the mitogenic effect of low concentrations of PDGF. ET-1 and ET-2 (10 nM) caused a 2-fold increase in the number of stained nuclei induced by 5 nM and 10 nM PDGF, whereas ET-3 and sarafotoxin S6b were less potent. These findings demonstrate that ET is a co-mitogen for rat vascular smooth muscle cells. The release of ET at sites of endothelial injury may therefore enhance the mitogenic action of locally acting PDGF on vascular smooth muscle cells and potentiate the proliferative response.

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