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The Journal of Immunology, 2002, 169: 5382-5386.
Copyright © 2002 by The American Association of Immunologists

Cutting Edge

Cutting Edge: CD94/NKG2 Is Expressed on Th1 But Not Th2 Cells and Costimulates Th1 Effector Functions1

Jennifer Hartt Meyers*, Akemi Ryu*, Laurent Monney*, Khuong Nguyen*, Edward A. Greenfield2, Gordon J. Freeman and Vijay K. Kuchroo3,*

* Center for Neurologic Diseases, Department of Neurology, Brigham and Women’s Hospital and {dagger} Department of Adult Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA 02115

Th1 and Th2 cells can be phenotypically distinguished by very few cell surface markers. To identify cell surface molecules that are specifically expressed on Th1 cells, we have generated a panel of mAbs that specifically bind the surfaces of murine Th1 but not Th2 cells. One of these Abs identified the NK cell receptor CD94 as a molecule also specifically expressed on the surface of Th1 cells. As in NK cells, CD94 is expressed on Th1 cells together with members of the NKG2 family of molecules, including NKG2A, C, and E. Cross-linking these receptors on differentiated Th1 cells in vitro costimulates proliferation and cytokine production with a potency similar to that obtained by cross-linking CD28. We propose that CD94/NKG2 heterodimers may costimulate effector functions of differentiated Th1 cells.




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