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The Journal of Immunology, 2002, 168: 5530-5537.
Copyright © 2002 by The American Association of Immunologists

Stimulation Through Intercellular Adhesion Molecule-1 Provides a Second Signal for T Cell Activation

Chintana Chirathaworn1,2, Jacob E. Kohlmeier1, Scott A. Tibbetts3, Lisa M. Rumsey, Marcia A. Chan and Stephen H. Benedict4

Department of Molecular Biosciences, University of Kansas, Lawrence, KS 66045

Regulation of T cell activation requires two signals. First, appropriately presented Ag in the context of MHC interacts with the T cell Ag receptor-CD3 complex. The best-studied second signal is CD28, which resides on the T cell and responds to its counter receptor, B7. A second signal also can be delivered through LFA-1 residing on the T cell, responding to its counter receptor ICAM-1 residing on a different cell. Characterization of a second signal is tied to its ability to costimulate (along with stimulation through the TCR) proliferation, IL-2 secretion, and coactivation of phosphatidylinositol 3-kinase. We examined whether ICAM-1, residing on the T cell surface, could deliver a second signal into that T cell. Costimulation through CD3 plus ICAM-1 caused increased T cell proliferation, increased expression of the activation marker CD69, increased transcription through the IL-2 regulatory region, and increased secretion of selected Th1 but not Th2 cytokines. Costimulation through CD3 plus ICAM-1 caused synergistic activation of phosphatidylinositol 3-kinase. Finally, the combination of anti-CD3 plus anti-ICAM-1 (but not anti-CD3 alone) caused prolonged proliferation of naive T cells in a manner similar to costimulation through LFA-1 or CD28. Thus, we demonstrate for the first time that ICAM-1 resident on a T cell can deliver a costimulatory signal into that T cell.




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