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LRP1-Dependent BMPER Signaling Regulates Lipopolysaccharide-Induced Vascular Inflammation.

Arterioscler. Thromb. Vasc. Biol.2017 Aug;37(8):1524-1535. Epub 2017 Jun 08
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摘要


OBJECTIVE:Bacterial endotoxin (lipopolysaccharide)-mediated sepsis involves dysregulated systemic inflammation, which injures the lung and other organs, often fatally. Vascular endothelial cells act as both targets and mediators of lipopolysaccharide-induced inflammatory responses. Dysfunction of endothelium results in increases of proinflammatory cytokine production and permeability leakage. BMPER (bone morphogenetic protein-binding endothelial regulator), an extracellular modulator of bone morphogenetic protein signaling, has been identified as a vital component in chronic endothelial inflammatory responses and atherosclerosis. However, it is unclear whether BMPER also regulates inflammatory response in an acute setting such as sepsis. To address this question, we investigated the role of BMPER during lipopolysaccharide-induced acute lung injury. APPROACH AND RESULTS:Mice missing 1 allele of BMPER (BMPER+/- mice used in the place of BMPER-/- mice that die at birth) were used for lipopolysaccharide challenge. Lipopolysaccharide-induced pulmonary inflammation and injury was reduced in BMPER+/- mice as shown by several measures, including survival rate, infiltration of inflammatory cells, edema, and production of proinflammatory cytokines. Mechanistically, we have demonstrated that BMPER is required and sufficient for the activation of nuclear factor of activated T cells c1. This BMPER-induced nuclear factor of activated T cells activation is coordinated by multiple signaling pathways, including bone morphogenetic protein-independent low-density lipoprotein receptor-related protein 1-extracellular signal-regulated kinase activation, calcineurin signaling, and low-density lipoprotein receptor-related protein 1β-mediated nuclear factor 45 nuclear export in response to BMPER treatment. CONCLUSIONS:We conclude that BMPER plays a pivotal role in pulmonary inflammatory response, which provides new therapeutic options against sepsis shock. The new signaling pathway initiated by BMPER/low-density lipoprotein receptor-related protein 1 axis broadens our understanding about BMPER's role in vascular homeostasis.

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