Targeting β1-integrin inhibits vascular leakage in endotoxemia

A1 Journal article (refereed)


Internal Authors/Editors


Publication Details

List of Authors: Hakanpaa L, Kiss EA, Jacquemet G, Miinalainen I, Lerche M, Guzman C, Mervaala E, Eklund L, Ivaska J, Saharinen P
Publisher: NATL ACAD SCIENCES
Publication year: 2018
Journal: Proceedings of the National Academy of Sciences
Journal acronym: P NATL ACAD SCI USA
Volume number: 115
Number of pages: 10
ISSN: 0027-8424


Abstract

Loss of endothelial integrity promotes capillary leakage in numerous diseases, including sepsis, but there are no effective therapies for preserving endothelial barrier function. Angiopoietin-2 (ANGPT2) is a context-dependent regulator of vascular leakage that signals via both endothelial TEK receptor tyrosine kinase (TIE2) and integrins. Here, we show that antibodies against beta 1-integrin decrease LPS-induced vascular leakage in murine endotoxemia, as either a preventative or an intervention therapy. beta 1-integrin inhibiting antibodies bound to the vascular endotheliumin vivo improved the integrity of endothelial cell-cell junctions and protected mice from endotoxemia-associated cardiac failure, without affecting endothelial inflammation, serum proinflammatory cytokine levels, or TIE receptor signaling. Moreover, conditional deletion of a single allele of endothelial beta 1-integrin protected mice from LPS-induced vascular leakage. In endothelial mono-layers, the inflammatory agents thrombin, lipopolysaccharide (LPS), and IL-1 beta decreased junctional vascular endothelial (VE)-cadherin and induced actin stress fibers via beta 1- and alpha 5-integrins and ANGPT2. Additionally, beta 1-integrin inhibiting antibodies prevented inflammation-induced endothelial cell contractility and monolayer permeability. Mechanistically, the inflammatory agents stimulated ANGPT2-dependent translocation of alpha 5 beta 1-integrin into tensin-1-positive fibrillar adhesions, which destabilized the endothelial monolayer. Thus, beta 1-integrin promotes endothelial barrier disruption during inflammation, and targeting beta 1-integrin signaling could serve as a novel means of blocking pathological vascular leak.


Keywords

ANGPT2, beta 1-integrin, Sepsis, TIE2

Last updated on 2019-06-12 at 03:52