Upregulation of TNF-alpha-induced ICAM-1 surface expression by adenylate cyclase-dependent pathway in human endothelial cells

Journal of Cellular Physiology
Denis BernotGilles Nalbone

Abstract

The level of adhesion molecules expressed at the endothelial cell surface is critical in the control of inflammation. Adenylate cyclase (AC) activity allowing cyclic adenosine monophosphate (cAMP) production can modulate the inflammatory process. We investigated the AC-dependent modulation of ICAM-1 surface expression in human umbilical venous endothelial cells (HUVEC). Pretreatment of HUVEC with forskolin significantly upregulated tumor necrosis factor alpha (TNF-alpha)- and interleukin-1 alpha (IL1-alpha)-induced ICAM-1 surface expression exclusively after a prolonged time of incubation with forskolin (at least 7-8 h). A poorly metabolizable analog of cAMP, dibutyryl-cAMP, mimicked forskolin effect on ICAM-1 surface expression. Protein kinase A (PKA) inhibitor H89 prevented forskolin effect on ICAM-1 surface expression. Upregulation of ICAM-1 surface level occurred through the increase in its mRNA levels and also to a subsequent activation of ICAM-1 intracellular trafficking towards cell surface. Stimulation by agonists of beta-adrenergic receptors did not alter the TNF-alpha-induced ICAM-1 surface expression. Pretreatment of HUVEC with pertussis toxin, which is known to activate AC through Gialpha inhibition, upregulated mRN...Continue Reading

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