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Targeting ?1-integrin inhibits vascular leakage in endotoxemia #MMPMID29941602
Hakanpaa L; Kiss EA; Jacquemet G; Miinalainen I; Lerche M; Guzmán C; Mervaala E; Eklund L; Ivaska J; Saharinen P
Proc Natl Acad Sci U S A 2018[Jul]; 115 (28): E6467-76 PMID29941602show ga
Compromised vascular integrity is associated with capillary leakage in sepsis, but effective therapies stabilizing the vasculature are lacking. Here, we show that targeting ?1-integrin in vivo with inhibitory antibodies or deletion of a single allele of endothelial ?1-integrin inhibits lipopolysaccharide (LPS)-induced vascular leakage in murine endotoxemia. The inflammatory agents IL-1?, thrombin, and LPS induced changes in endothelial cell?extracellular matrix (ECM) adhesion via ?1-integrin, angiopoietin-2, and the adapter protein tensin-1, leading to increased endothelial cell contractility and permeability. These results indicate that ?1-integrin actively promotes vascular leakage and that targeting ?1-integrin signaling could be a novel means of achieving vascular stabilization in pathological vascular leak.