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

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.

Authors:
 [1];  [2]
  1. U.S. Food and Drug Administration (FDA), Bethesda, MD (United States). Center for Biologics Evaluation and Research. Division of Hematology. Lab. of Biochemistry and Vascular Biology; Georgetown Univ., Washington, DC (United States). Dept. of Microbiology and Immunology
  2. U.S. Food and Drug Administration (FDA), Bethesda, MD (United States). Center for Biologics Evaluation and Research. Division of Hematology. Lab. of Biochemistry and Vascular Biology
Publication Date:
Research Org.:
Oak Ridge Institute for Science and Education (ORISE), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER). Biological Systems Science Division
OSTI Identifier:
1628578
Grant/Contract Number:  
SC0014664
Resource Type:
Accepted Manuscript
Journal Name:
Toxins
Additional Journal Information:
Journal Volume: 3; Journal Issue: 10; Journal ID: ISSN 2072-6651
Publisher:
MDPI
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; Food Science & Technology; Toxicology; anthrax lethal toxin; vascular endothelium; adherens junction; barrier function; cadherin; actin stress fibers

Citation Formats

Warfel, Jason M., and D’Agnillo, Felice. Anthrax Lethal Toxin-Mediated Disruption of Endothelial VE-Cadherin Is Attenuated by Inhibition of the Rho-Associated Kinase Pathway. United States: N. p., 2011. Web. doi:10.3390/toxins3101278.
Warfel, Jason M., & D’Agnillo, Felice. Anthrax Lethal Toxin-Mediated Disruption of Endothelial VE-Cadherin Is Attenuated by Inhibition of the Rho-Associated Kinase Pathway. United States. https://doi.org/10.3390/toxins3101278
Warfel, Jason M., and D’Agnillo, Felice. Thu . "Anthrax Lethal Toxin-Mediated Disruption of Endothelial VE-Cadherin Is Attenuated by Inhibition of the Rho-Associated Kinase Pathway". United States. https://doi.org/10.3390/toxins3101278. https://www.osti.gov/servlets/purl/1628578.
@article{osti_1628578,
title = {Anthrax Lethal Toxin-Mediated Disruption of Endothelial VE-Cadherin Is Attenuated by Inhibition of the Rho-Associated Kinase Pathway},
author = {Warfel, Jason M. and D’Agnillo, Felice},
abstractNote = {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.},
doi = {10.3390/toxins3101278},
journal = {Toxins},
number = 10,
volume = 3,
place = {United States},
year = {Thu Oct 20 00:00:00 EDT 2011},
month = {Thu Oct 20 00:00:00 EDT 2011}
}

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Interactions between anthrax toxin receptors and protective antigen
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Anthrax toxin-induced shock in rats is associated with pulmonary edema and hemorrhage
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The Heart Is an Early Target of Anthrax Lethal Toxin in Mice: A Protective Role for Neuronal Nitric Oxide Synthase (nNOS)
journal, May 2009


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Works referencing / citing this record:

Anthrax immune globulin improves hemodynamics and survival during B. anthracis toxin-induced shock in canines receiving titrated fluid and vasopressor support
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