The Journal of Experimental Medicine
VeriKine-HS Human IFN-Beta
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© The Rockefeller University Press, 0022-1007/1997/7/47/ $5.00
The Journal of Experimental Medicine, Volume 186, Number 1, July 7, 1997 47-55


Articles

4-1BB Costimulatory Signals Preferentially Induce CD8+ T Cell Proliferation and Lead to the Amplification In Vivo of Cytotoxic T Cell Responses

Walter W. Shuford*, Kerry Klussman*, Douglas D. Tritchler*, Deryk T. Loo*, Jan Chalupny*, Anthony W. Siadak*, T. Joseph Brown*, John Emswiler*, Hong Raecho{ddagger}, Christian P. Larsen{ddagger}, Thomas C. Pearson{ddagger}, Jeffrey A. Ledbetter*, Alejandro Aruffo*, and Robert S. Mittler*

From the * Bristol-Myers Squibb Pharmaceutical Research Institute, Seattle, Washington 98121; and {ddagger} Department of Surgery, Emory University School of Medicine, Atlanta, Georgia 30322

The 4-1BB receptor is an inducible type I membrane protein and member of the tumor necrosis factor receptor (TNFR) superfamily that is rapidly expressed on the surface of CD4+ and CD8+ T cells after antigen- or mitogen-induced activation. Cross-linking of 4-1BB and the T cell receptor (TCR) on activated T cells has been shown to deliver a costimulatory signal to T cells. Here, we expand upon previously published studies by demonstrating that CD8+ T cells when compared with CD4+ T cells are preferentially responsive to both early activation events and proliferative signals provided via the TCR and 4-1BB. In comparison, CD28-mediated costimulatory signals appear to function in a reciprocal manner to those induced through 4-1BB costimulation. In vivo examination of the effects of anti-4-1BB monoclonal antibodies (mAbs) on antigen-induced T cell activation have shown that the administration of epitope-specific anti-4-1BB mAbs amplified the generation of H-2d–specific cytotoxic T cells in a murine model of acute graft versus host disease (GVHD) and enhanced the rapidity of cardiac allograft or skin transplant rejection in mice. Cytokine analysis of in vitro activated CD4+ and CD8+ T cells revealed that anti-4-1BB costimulation markedly enhanced interferon-{gamma} production by CD8+ T cells and that anti-4-1BB mediated proliferation of CD8+ T cells appears to be IL-2 independent. The results of these studies suggest that regulatory signals delivered by the 4-1BB receptor play an important role in the regulation of cytotoxic T cells in cellular immune responses to antigen.


Address correspondence to Robert S. Mittler, Bristol-Myers Squibb Pharmaceutic Research Institute, Seattle, Washington 98121.

1Abbreviations used in this paper: 4-1BBL, 4-1BB ligand; EU, endotoxin units; FBS, fetal bovine serum; NGFR, nerve growth factor receptor; SN, activated T cell supernatants.


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