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From the * Department of Microbiology and Immunology, 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.
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
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