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The Journal of Immunology, Vol 149, Issue 6 2021-2027, Copyright © 1992 by American Association of Immunologists
ARTICLES |
A Mackiewicz, H Schooltink, PC Heinrich and S Rose-John
Department of Cancer Immunology, Academy of Medicine at Great Poland Cancer Center, Poznan.
IL-6 is a major regulator of acute phase protein synthesis in the liver. It exerts its action via a plasma membrane receptor consisting of two subunits, a ligand binding 80-kDa glycoprotein and a 130-kDa glycoprotein involved in signal transduction. We genetically generated a soluble form of the 80-kDa subunit of the human IL-6R (shIL-6R) in mouse fibroblasts (NIH/3T3 cells). The shIL-6R added to human hepatoma cells (HepG2) amplified the induction of alpha 1-antichymotrypsin and haptoglobin by IL-6 at the mRNA and protein level. Moreover, a model for a liver permanently exposed to high IL-6 concentrations has been developed; HepG2 cells were stably transfected with human IL-6-cDNA; 10(6) of the transfected cells (HepG2-IL-6) synthesized and secreted 2 micrograms of IL-6 within 24 h. Incubation of these cells with endogenous or exogenous IL-6 did not result in acute-phase protein induction. However, these IL-6-desensitized cells responded to other cytokines such as leukemia inhibitory factor, transforming growth factor beta 1, and IFN-gamma, known to modulate acute phase protein synthesis in the liver. Incubation of HepG2-IL-6 cells with shIL-6R reconstituted their responsiveness to IL-6 in a dose- and time- dependent manner. The possible biologic role that might be played by the shIL-6R in disease is discussed.
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