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

Weiguo Chen, Yulia Epshtein, Xiuquin Ni, Randal O. Dull, Anne E Cress, Joe GN Garcia, Jeffrey R. Jacobson

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

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.

Original languageEnglish (US)
Article number16529
JournalScientific Reports
Volume5
DOIs
StatePublished - Nov 17 2015

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Mechanical Stress
Integrins
Ventilator-Induced Lung Injury
Endothelial Cells
Lung
Tyrosine
Hydroxymethylglutaryl-CoA Reductase Inhibitors
Simvastatin
Cytoprotection
Phosphorylation
Cytokines
Chemokine CCL5
Lung Injury
Phenylalanine
Interleukin-8
Pulmonary Artery
Blood Vessels
Interleukin-6
Anti-Inflammatory Agents

ASJC Scopus subject areas

  • General

Cite this

Role of Integrin β4 in Lung Endothelial Cell Inflammatory Responses to Mechanical Stress. / Chen, Weiguo; Epshtein, Yulia; Ni, Xiuquin; Dull, Randal O.; Cress, Anne E; Garcia, Joe GN; Jacobson, Jeffrey R.

In: Scientific Reports, Vol. 5, 16529, 17.11.2015.

Research output: Contribution to journalArticle

Chen, Weiguo ; Epshtein, Yulia ; Ni, Xiuquin ; Dull, Randal O. ; Cress, Anne E ; Garcia, Joe GN ; Jacobson, Jeffrey R. / Role of Integrin β4 in Lung Endothelial Cell Inflammatory Responses to Mechanical Stress. In: Scientific Reports. 2015 ; Vol. 5.
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