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© by The Society for Leukocyte Biology
Journal of Leukocyte Biology, doi:10.1189/jlb.0807579

Received for publication August 28, 2007.
Revised November 19, 2007.
Accepted for publication December 13, 2007.

Article

Ly49 C/I-dependent NKT cell-derived IL-10 is required for corneal graft survival and peripheral tolerance

C. M. Watte *, T. Nakamura *, C. H. Lau *, J. R. Ortaldo {dagger}, and J. Stein-Streilein *@

*Schepens Eye Research Institute, Department of Ophthalmology, Harvard Medical School, Boston, Massachusetts, USA; and {dagger}Laboratory of Experimental Immunology, National Cancer Institute-Center for Cancer Research, Frederick, Maryland, USA

@ To whom correspondence should be addressed. E-mail: joan.stein{at}schepens.harvard.edu.


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Abstract

Similar to their activity on NK cells, Ly49 molecules play a pivotal role in influencing how NKT cells respond. It is known that Ly49 C/I is an inhibitory receptor capable of down-modulating proliferation, IFN-{gamma} response, and cytotoxic activity in cells that express it. In a model of peripheral tolerance induced via the eye, we observed that Ly49 C/I-positive, invariant NKT cells were required. To test if the NK inhibitory receptor functionally contributed to tolerance development, we used blocking antibody, in vivo and in vitro, to interfere with the development of antigen-specific suppression. A result of blocking ligation of Ly49 C/I inhibitory receptor prevented NKT cell production of IL-10 and the subsequent development of tolerance. Ly49 C/I-blocking antibodies also prevented corneal graft survival, a phenomenon dependent on eye-induced tolerance. Furthermore, in the presence of TCR stimulation, cross-linking of Ly49 C/I on CD4+ NKT cells stimulated an increase in IL-10 mRNA and a decrease in IFN-{gamma}. The concept of Ly49 inhibitory receptors regulating immune reactivity to self by regulating immune activity of individual cells is thus expanded to include a role for the inhibitory receptors in the more global process of peripheral tolerance to foreign antigens.

Key Words: NK inhibitory receptors • cytokines • immunosuppression




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