The Journal of Immunology, Vol 152, Issue 8 4017-4025, Copyright © 1994 by American Association of Immunologists

ARTICLES

Differential roles of two types of the TNF receptor in TNF-induced cytotoxicity, DNA fragmentation, and differentiation

M Higuchi and BB Aggarwal
Department of Clinical Immunology and Biological Therapy, University of Texas M. D. Anderson Cancer Center, Houston 77030.

Two different types of TNF receptors, the p60 receptor with a molecular mass of 60 kDa and the p80 receptor with a mass of 80 kDa, have been identified. TNF exhibits a wide variety of biologic actions, but which receptor is responsible for these biologic actions is not well characterized. In the present study, we examined the roles of the p60 and p80 receptors in three different TNF-induced biologic actions: 1) cytotoxicity; 2) DNA fragmentation; and 3) differentiation to macrophages. Analysis of TNF actions on various tumor cell lines revealed that TNF-induced cytotoxicity occurred in cells that expressed the p60 receptor, irrespective of expression of the p80 receptor. In contrast, DNA fragmentation and differentiation were observed only in cells that expressed both receptor types. Additionally, the specific Ab to each receptor were used to examine the roles of both receptors in the myelogenous leukemia cell line, ML-1a. Anti-p60 Ab alone showed cytotoxicity but little DNA fragmentation and differentiation, and anti- p80 Ab alone showed no effects. When these Abs were added in the presence of TNF, each independently, and almost completely, inhibited TNF-induced DNA fragmentation and differentiation. We also found that both Abs together synergistically induce differentiation and DNA fragmentation. These results indicate that signals through the p60 receptor are essential to induce cytotoxicity, but signals through both the p60 and p80 receptors are necessary, and act synergistically, for DNA fragmentation and differentiation.

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