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Biochem Biophys Res Commun 2005 Oct 7;337(4):1249-1256

Anthrax lethal toxin enhances cytokine-induced VCAM-1 expression on human endothelial cells.

Steele AD, Warfel JM, D'Agnillo F

D'Agnillo F, US FDA, Lab Biochem & Vasc Biol, Div Hematol, Ctr Biol Evaluat & Res, Bethesda, MD 20014 USA US FDA, Lab Biochem & Vasc Biol, Div Hematol, Ctr Biol Evaluat & Res, Bethesda, MD 20014 USA


Vascular endothelial dysfunction is thought to play a prominent role in systemic anthrax pathogenesis. We examined the effect of anthrax lethal toxin (LTx), a key virulence factor of Bacillus anthracis, on the expression of vascular cell adhesion molecule-1 (VCAM-1) on normal and cytokine-stimulated human lung microvascular endothelial cells. Confluent endothelial monolayers were treated with lethal factor (LF), protective antigen (PA), or both (LTx) in the presence or absence of tumor necrosis factor-alpha (TNFalpha). LTx enhanced cytokine-induced VCAM-1 expression and monocyte adhesion. LTx alone had no effect on VCAM-1 expression. LF, PA or the combination of a catalytically inactive mutant LF and PA failed to enhance cytokine-induced VCAM-1 expression. Treatment with inhibitors of mitogen-activated protein kinase kinases (MEKs) and mitogen-activated protein kinases did not reproduce the VCAM-1 enhancement effect of LTx, a known MEK metalloprotease, suggesting LTx-mediated MEK cleavage may not be a contributing factor.

Category: Journal Article
PubMed ID: #16242117
Includes FDA Authors from Scientific Area(s): Biologics
Entry Created: 2011-10-04 Entry Last Modified: 2012-08-29