Interleukine-6 in autoimmune and inflammatory diseases: a personal memoir

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  • HIRANO Toshio
    Laboratory of Developmental Immunology, JST-CREST, Graduate School of Frontier Biosciences, Graduate School of Medicine, and WPI Immunology Frontier Research Center, Osaka University Laboratory of Cytokine Signaling, RIKEN Research Center for Allergy and Immunology

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  • Interleukin 6 in autoimmune and inflammatory diseases: a personal memoir

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In this review, the author discusses the research that led to the identification and characterization of interleukin 6 (IL-6), including his own experience isolating IL-6, and the roles this cytokine has on autoimmune and inflammatory diseases. The cDNAs encoding B-cell stimulatory factor 2 (BSF-2), interferon (IFN)-β2 and a 26-kDa protein were independently cloned in 1986, which in turn led to the identification of each. To resolve the confusing nomenclature, these identical molecules were named IL-6. Characterization of IL-6 revealed a multifunctional cytokine that is involved in not only immune responses but also hematopoiesis, inflammation, and bone metabolism. Moreover, IL-6 makes significant contributions to such autoimmune and inflammatory diseases as rheumatoid arthritis (RA).<br>IL-6 activates both the STAT3 and SHP2/Gab/MAPK signaling pathways via the gp130 signal transducer. F759 mice, which contain a single amino-acid substitution in gp130 (Y759F) and show enhanced STAT3 activation, spontaneously develop a RA-like arthritis as they age. F759 arthritis is dependent on CD4+ T cells, IL-6, and IL-17A, and is enhanced by the pX gene product from human T cell leukemia virus 1 (HTLV-1). Arthritis development in these mice requires that the F759 mutation is present in nonhematopoietic cells, but not in immune cells, highlighting the important role of the interaction between nonimmune tissues and the immune system in this disease. Furthermore, this interaction is mediated by the IL-6 amplifier through STAT3 and NF-κB. Ultimately, this model may represent a general etiologic process underlying other autoimmune and inflammatory diseases. More importantly, the understanding of IL-6 has paved the way for new therapeutic approaches for RA and other autoimmune and inflammatory diseases.<BR><BR>(Communicated by Tasuku HONJO, M.J.A.)

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