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The Journal of Immunology, Vol 149, Issue 10 3350-3353, Copyright © 1992 by American Association of Immunologists
ARTICLES |
GH Wong, LA Tartaglia, MS Lee and DV Goeddel
Department of Immunology, Genentech, Inc., South San Francisco, CA 94080.
Agonist antibodies (Ab) to the two TNF receptors, TNF-R1 (55 kDa) and TNF-R2 (75 kDa), have been shown to signal many of the distinct functions induced by TNF-alpha. We have found that anti-TNF-R1, but not anti-TNF-R2, Ab trigger antiviral activity in human hepatoma Hep-G2 cells and enhance the antiviral activity of IFN-gamma in human lung fibroblast A549 cells. Likewise, anti-human-TNF-R1 Ab had antiviral enhancing activity on murine L929 cells engineered to express human TNF- R1. However, L929 cells that express human TNF-R1 lacking most of the intracellular domain fail to respond to anti-human-TNF-R1 Ab. This demonstrates that the intracellular domain of TNF-R1 is necessary to generate antiviral activity. TNF-R1 but not TNF-R2 also signals killing of virus-infected cells by TNF-alpha. Thus, all the known antiviral activities of TNF-alpha are mediated through TNF-R1.
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