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* Department of Infectious Diseases,
Department of Immunology, and
Hartwell Center for Bioinformatics and Biotechnology, St. Jude Childrens Research Hospital, Memphis, TN 38105;
Walter and Eliza Hall Institute of Medical Research,
¶ Ludwig Institute for Cancer Research, Royal Melbourne Hospital, Parkville, Victoria, Australia;
|| Laboratory of Molecular Cell Biology, Rockefeller University, New York, NY 10016;
# Center for the Development of Molecular Target Drugs, Cancer Research Institute, Kanazawa University, Kanazawa, Ishikawa, Japan;
** Division of Therapeutic Proteins, Center for Drug Evaluation & Research, U.S. Food and Drug Administration, Bethesda, MD 20892;

Division of Metabolism, Endocrinology and Diabetes, Department of Medicine, University of Michigan Medical School, Ann Arbor, MI 48109; and
* Department of Immunology, M.D. Anderson Cancer Center, Houston, TX 77030
Although many cytokine receptors generate their signals via the STAT3 pathway, the IL-10R appears unique in promoting a potent anti-inflammatory response (AIR) via STAT3 to antagonize proinflammatory signals that activate the innate immune response. We found that heterologous cytokine receptor systems that activate STAT3 but are naturally refractory (the IL-22R), or engineered to be refractory (the IL-6, leptin, and erythropoietin receptors), to suppressor of cytokine signaling-3-mediated inhibition activate an AIR indistinguishable from IL-10. We conclude that the AIR is a generic cytokine signaling pathway dependent on STAT3 but not unique to the IL-10R.
The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked advertisement in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.
1 This work was supported in part by National Institutes of Health Grant AI062921, the Sandler Program for Asthma Research, The Cancer Center Support CORE Grant P30 CA 21765, and by the American Lebanese Syrian Associated Charities.
2 Address correspondence and reprint requests to Dr. Peter J. Murray, Department of Infectious Diseases, St. Jude Childrens Research Hospital, Memphis, TN 38105. E-mail address: peter.murray{at}stjude.org
3 Abbreviations used in this paper: AIR, anti-inflammatory response; BMDM, bone marrow-derived macrophage; SOCS, suppressor of cytokine signaling; EPO, erythropoietin; EpoR, erythropoietin receptor; ELR, EpoR-leptin R hybrid.
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