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Ly49 C/I‐dependent NKT cell‐derived IL‐10 is required for corneal graft survival and peripheral tolerance
Author(s) -
Watte C. M.,
Nakamura T.,
Lau C. H.,
Ortaldo J. R.,
SteinStreilein J.
Publication year - 2008
Publication title -
journal of leukocyte biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.819
H-Index - 191
eISSN - 1938-3673
pISSN - 0741-5400
DOI - 10.1189/jlb.0807579
Subject(s) - biology , natural killer t cell , cytotoxic t cell , receptor , microbiology and biotechnology , immune system , antigen , t cell receptor , immune tolerance , immunology , t cell , in vitro , biochemistry
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‐γ 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‐γ. 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.