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The Journal of Immunology, Vol 145, Issue 12 4371-4379, Copyright © 1990 by American Association of Immunologists
ARTICLES |
K Takahashi, T Nakamura, M Koyanagi, K Kato, Y Hashimoto, H Yagita and K Okumura
Department of Immunology, Juntendo University School of Medicine, Tokyo, Japan.
CD2 and lymphocyte function-associated antigen (LFA)-1 are well known as T cell adhesion molecules involved in killer-target cell interactions. However, our recent study revealed that molecule(s) other than CD2 and LFA-1 might be involved in the lymphokine-activated killer (LAK) cell cytotoxicity against certain target cells. In order to characterize such unknown molecules, we established a mAb (RMV-7) which could inhibit CD2/LFA-1-independent LAK cell cytotoxicity and binding to target cells at the effector site. The Ag identified by RMV-7 appeared on splenic T cells late after mitogenic stimulation and was a noncovalently linked heterodimer composed of a 140-kDa alpha-chain and a 95-kDa beta-chain. RMV-7 blocked LAK cell binding to fibronectin (FN), fibrinogen, and vitronectin but not that to laminin or type IV collagen, indicating that the RMV-7-defined molecule is a unique extracellular matrix receptor for FN, fibrinogen, and vitronectin. One of its ligand, FN, was found on the surface of several target cells, and LAK cell cytotoxicity against them was blocked by anti-FN antibody at the target site. Similarly, cytotoxicity of a H-2d-specific CTL clone was inhibited by RMV-7 and anti-FN antibody as well. These results indicate that a unique very late activation Ag-like extracellular matrix receptor on murine CTL and LAK cells contributes to target cell binding and cytotoxicity.
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