Role of Integrin...... Mechanical Stress.pdf (1.27 MB)

Role of Integrin β4 in Lung Endothelial Cell Inflammatory Responses to Mechanical Stress

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journal contribution
posted on 29.08.2016 by W. Chen, Y. Epshtein, X. Ni, R. O. Dull, A. E. Cress, J. G. N. Garcia, J. R. Jacobson
Simvastatin, an HMG-CoA reductase inhibitor, has lung vascular-protective effects that are associated with decreased agonist-induced integrin β4 (ITGB4) tyrosine phosphorylation. Accordingly, we hypothesized that endothelial cell (EC) protection by simvastatin is dependent on these effects and sought to further characterize the functional role of ITGB4 as a mediator of EC protection in the setting of excessive mechanical stretch at levels relevant to ventilator-induced lung injury (VILI). Initially, early ITGB4 tyrosine phosphorylation was confirmed in human pulmonary artery EC subjected to excessive cyclic stretch (18% CS). EC overexpression of mutant ITGB4 with specific tyrosines mutated to phenylalanine (Y1440, Y1526 Y1640, or Y1422) resulted in significantly attenuated CS-induced cytokine expression (IL6, IL-8, MCP-1, and RANTES). In addition, EC overexpression of ITGB4 constructs with specific structural deletions also resulted in significantly attenuated CS-induced inflammatory cytokine expression compared to overexpression of wildtype ITGB4. Finally, mice expressing a mutant ITGB4 lacking a cytoplasmic signaling domain were found to have attenuated lung injury after VILI-challenge (VT = 40 ml/kg, 4 h). Our results provide mechanistic insights into the anti-inflammatory properties of statins and may ultimately lead to novel strategies targeted at ITGB4 signaling to treat VILI.

Funding

This work acknowledges support from NIH HL096887 (JJ).

History

Publisher Statement

This is a copy of an article published in the Scientific Reports. © 2015, Nature Publishing Group. All rights reserved. www.nature.com/scientificreports/

Publisher

Nature Publishing Group

Language

en_US

issn

2045-2322

Issue date

17/11/2015

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