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2017 ; 28
(7
): 1973-1982
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The Angiopoietin-Tie2 Signaling Axis in Systemic Inflammation
#MMPMID28465380
Parikh SM
J Am Soc Nephrol
2017[Jul]; 28
(7
): 1973-1982
PMID28465380
show ga
Systemic inflammation is a hallmark of commonly encountered diseases ranging from
bacterial sepsis to sterile syndromes such as major trauma. Derangements in the
host vasculature contribute to the cardinal manifestations of sepsis in profound
ways. Recent studies of control pathways regulating the vascular endothelium have
illuminated how this single cell layer toggles between quiescence and activation
to affect the development of shock and multiorgan dysfunction. This article
focuses on one such control pathway, the Tie2 receptor and its ligands the
angiopoietins, to describe a growing body of genetic, biochemical, mechanistic,
and human studies that implicate Tie2 as a critical switch. In health, activated
Tie2 maintains the endothelium in a quiescent state characterized by dynamic
barrier function and antiadhesion against circulating leukocytes. In sepsis and
related diseases, expression of the angiopoietins becomes markedly imbalanced and
Tie2 signaling is greatly attenuated. These rapid molecular changes potentiate
pathophysiologic responses throughout the body, resulting in injurious vascular
leakage and organ inflammation. The Tie2 axis, therefore, may be a promising
avenue for future translational studies.