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EXTRACELLULAR MATRIX, CELL INTERACTIONS

Oncostatin M differentially regulates CXC chemokines in mouse cardiac fibroblasts

¹Department of Medicine, Cardiovascular Sciences, DeBakey Heart Center, The Methodist Hospital, and Baylor College of Medicine, Houston; and ²Department of Pediatrics, Leukocyte Biology, Children's Nutrition Research Center, Baylor College of Medicine, Houston, Texas

Submitted 1 July 2005 ; accepted in final form 23 January 2006

Ischemia-reperfusion injury in the heart is characterized by marked infiltration of neutrophils in the myocardial interstitial space. Studies in human, canine, and murine models have revealed oncostatin M (OSM) expression in infiltrating leukocytes. In an effort to assess possible roles of OSM in the myocardium, we used cardiac fibroblasts (mCFs) isolated from adult mouse heart to determine whether recombinant murine OSM regulates the synthesis and release of MIP2/CXCL2, KC/CXCL1, and LIX/CXCL5, which are three potent neutrophil chemoattractants in the mouse. Our results demonstrate that mCFs express OSM receptors and that, within the IL-6 cytokine family, OSM uniquely induces significant release of KC and LIX in mCFs. In addition, although OSM activates the JAK-signal transducers and activators of transcription and MAPK pathways, we demonstrate that the OSM-mediated CXC chemokine release in mCFs is also dependent on the activation of the phosphatidylinositol 3-kinase pathway.

inflammation; cytokine; neutrophil

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