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We have studied the effect of human recombinant tumour necrosis factor-alpha (TNF-alpha) on gene expression and production of endothelin-1 in cultured bovine aortic endothelial cells. TNF-alpha (10 and 100 ng ml(-1)) increased in a time dependent manner the preproendothelin-1 mRNA levels in respect to unstimulated endothelial cells. TNF-alpha induced endothelin-1 gene expression was associated with a parallel increase in the release of the corresponding peptide in the culture medium. These findings suggest that the enhanced synthesis and release of endothelin-1 occurring in conditions of increased generation of TNF, may act as a modulatory factor that counteracts the hypotensive effect and the excessive platelet aggregation and adhesion induced by TNF.

Turnour necrosis factor stimulates endothelin-1 gene expression in cultured bovine endothelial cells