Phosphatidic acid signaling mediates lung cytokine expression and lung inflammatory injury after hemorrhage in mice

doi:10.1084/jem.181.2.569

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Phosphatidic acid signaling mediates lung cytokine expression and lung inflammatory injury after hemorrhage in mice

E Abraham, S Bursten, R Shenkar, J Allbee, R Tuder, P Woodson, DM Guidot, G Rice, JW Singer and JE Repine
Division of Pulmonary Sciences and Critical Care Medicine, University of Colorado Health Sciences Center, Denver 80262.

Because phosphatidic acid (PA) pathway signaling may mediate many basic reactions involving cytokine-dependent responses, we investigated the effects of CT1501R, a functional inhibitor of the enzyme lysophosphatidic acid acyltransferase (LPAAT) which converts lysophosphatidic acid (Lyso-PA) to PA. We found that CT1501R treatment not only prevented hypoxia-induced PA increases and lyso-PA consumption in human neutrophils, but also prevented neutrophil chemotaxis and adherence in vitro, and lung injury and lung neutrophil accumulation in mice subjected to hemorrhage and resuscitation. In addition, CT1501R treatment prevented increases in mRNA levels and protein production of a variety of proinflammatory cytokines in multiple lung cell populations after blood loss and resuscitation. Our results indicate the fundamental role of PA metabolism in the development of acute inflammatory lung injury after blood loss.
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