The Journal of Experimental Medicine
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© The Rockefeller University Press, 0022-1007/1997/5/1573/ $5.00
The Journal of Experimental Medicine, Volume 185, Number 9, May 5, 1997 1573-1584


Articles

Chronic Tumor Necrosis Factor Alters T Cell Responses by Attenuating T Cell Receptor Signaling

Andrew P. Cope*, Roland S. Liblau*, Xiao-Dong Yang*, Mauro Congia*, Carlo Laudanna{ddagger}, Robert D. Schreiber||, Lesley Probert, George Kollias, and Hugh O. McDevitt*,§

From the * Department of Microbiology and Immunology, {ddagger} Department of Pathology, and § Department of Medicine, Stanford University School of Medicine, Stanford, California 94305; || Department of Pathology, Washington University School of Medicine, St. Louis, Missouri 63110; and Department of Molecular Genetics, Hellenic Pasteur Institute, Athens, Greece

Repeated injections of adult mice with recombinant murine TNF prolong the survival of NZB/W F1 mice, and suppress type I insulin-dependent diabetes mellitus (IDDM) in nonobese diabetic (NOD) mice. To determine whether repeated TNF injections suppress T cell function in adult mice, we studied the responses of influenza hemagglutinin-specific T cells derived from T cell receptor (HNT-TCR) transgenic mice. Treatment of adult mice with murine TNF for 3 wk suppressed a broad range of T cell responses, including proliferation and cytokine production. Furthermore, T cell responses of HNT-TCR transgenic mice also expressing the human TNF-globin transgene were markedly reduced compared to HNT-TCR single transgenic littermates, indicating that sustained p55 TNF-R signaling is sufficient to suppress T cell function in vivo. Using a model of chronic TNF exposure in vitro, we demonstrate that (a) chronic TNF effects are dose and time dependent, (b) TNF suppresses the responses of both Th1 and Th2 T helper subsets, (c) the suppressive effects of endogenous TNF produced in T cell cultures could be reversed with neutralizing monoclonal antibodies to TNF, and (d) prolonged TNF exposure attenuates T cell receptor signaling. The finding that anti-TNF treatment in vivo enhances T cell proliferative responses and cytokine production provides evidence for a novel regulatory effect of TNF on T cells in healthy laboratory mice. These effects are more pronounced in chronic inflammatory disease. In addition, our data provide a mechanism through which prolonged TNF exposure suppresses disease in animal models of autoimmunity.


Address correspondence to Dr. Hugh O. McDevitt, Department of Microbiology and Immunology, Rm D345, Sherman Fairchild Building, Stanford University School of Medicine, Stanford, CA, 94305. Dr. Liblau's current address is Cellular Immunology Laboratory and INSERM U134, Hopital Pitie-Salpetriere, Paris 75013, France. Dr. Yang's present address is Cell Genesys, 344 Lakeside Drive, Foster City, CA 94404.

1 Abbreviations used in this paper: IDDM, insulin-dependent diabetes mellitus; NOD, non-obese diabetic; RA, rheumatoid arthritis.


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