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Toxins 2011, 3(10), 1278-1293; doi:10.3390/toxins3101278

Anthrax Lethal Toxin-Mediated Disruption of Endothelial VE-Cadherin Is Attenuated by Inhibition of the Rho-Associated Kinase Pathway

1
Laboratory of Biochemistry and Vascular Biology, Division of Hematology, Center for Biologics Evaluation and Research, Food and Drug Administration, Bethesda, Maryland, MD 20892, USA
2
Department of Microbiology and Immunology, Georgetown University Medical Center, Washington, DC 20057, USA
Current address: Laboratory of Respiratory and Special Pathogens, Division of Bacterial, Parasitic and Allergenic Products, Center for Biologics Evaluation and Research, Food and Drug Administration, Bethesda, MD 20892, USA
*
Author to whom correspondence should be addressed.
Received: 8 July 2011 / Revised: 1 October 2011 / Accepted: 9 October 2011 / Published: 20 October 2011
(This article belongs to the Special Issue Anthrax Toxin)
View Full-Text   |   Download PDF [1317 KB, 25 October 2011; original version 20 October 2011]   |  

Abstract

Systemic anthrax disease is characterized by vascular leakage pathologies. We previously reported that anthrax lethal toxin (LT) induces human endothelial barrier dysfunction in a cell death-independent manner with actin stress fiber formation and disruption of adherens junctions (AJs). In the present study, we further characterize the molecular changes in the AJ complex and investigate whether AJ structure and barrier function can be preserved by modulating key cytoskeletal signaling pathways. Here, we show that LT reduces total VE-cadherin protein and gene expression but the expression of the key linker protein beta-catenin remained unchanged. The changes in VE-cadherin expression correlated temporally with the appearance of actin stress fibers and a two-fold increase in phosphorylation of the stress fiber-associated protein myosin light chain (p-MLC) and cleavage of Rho-associated kinase-1 (ROCK-1). Co-treatment with ROCK inhibitors (H-1152 and Y27632), but not an inhibitor of MLC kinase (ML-7), blocked LT-induced p-MLC enhancement and stress fiber formation. This was accompanied by the restoration of VE-cadherin expression and membrane localization, and attenuation of the LT-induced increase in monolayer permeability to albumin. Together, these findings suggest the ROCK pathway may be a relevant target for countering LT-mediated endothelial barrier dysfunction. View Full-Text
Keywords: anthrax lethal toxin; vascular endothelium; adherens junction; barrier function; cadherin; actin stress fibers anthrax lethal toxin; vascular endothelium; adherens junction; barrier function; cadherin; actin stress fibers
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Warfel, J.M.; D’Agnillo, F. Anthrax Lethal Toxin-Mediated Disruption of Endothelial VE-Cadherin Is Attenuated by Inhibition of the Rho-Associated Kinase Pathway. Toxins 2011, 3, 1278-1293.

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