The Journal of Experimental Medicine
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© The Rockefeller University Press, 0022-1007/1999/11/1215/ $5.00
The Journal of Experimental Medicine, Volume 190, Number 9, November 1, 1999 1215-1226


Original Article

CD1-reactive Natural Killer T Cells Are Required for Development of Systemic Tolerance through an Immune-Privileged Site

Koh-Hei Sonodaa, Mark Exleyb, Scott Snapperc, Steven P. Balkb, and Joan Stein-Streileina,d
a Schepens Eye Research Institute, Harvard Medical School, Boston, Massachusetts 02114
b Cancer Biology Program, Hematology/Oncology Division, Beth Israel-Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts 02215
c Gastrointestinal Unit (Medical Services) and Center for Study of Inflammatory Bowel Disease, Department of Medicine, Massachusetts General Hospital, Boston, Massachusetts 02114
d Pulmonary and Critical Care Division, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts 02115

Correspondence to: Joan Stein-Streilein, Schepens Eye Research Institute, 20 Staniford St., Boston, MA 02114. Tel:617-912-7494 Fax:617-912-0105 E-mail:jstein{at}vision.eri.harvard.edu.

Systemic tolerance can be elicited by introducing antigen into an immune-privileged site, such as the eye, or directly into the blood. Both routes of immunization result in a selective deficiency of systemic delayed type hypersensitivity. Although the experimental animal model of anterior chamber–associated immune deviation (ACAID) occurs in most mouse strains, ACAID cannot be induced in several mutant mouse strains that are coincidentally deficient in natural killer T (NKT) cells. Therefore, this model for immune-privileged site–mediated tolerance provided us with an excellent format for studying the role of NKT cells in the development of tolerance. The following data show that CD1-reactive NKT cells are required for the development of systemic tolerance induced via the eye as follows: (a) CD1 knockout mice were unable to develop ACAID unless they were reconstituted with NKT cells together with CD1+ antigen-presenting cells; (b) specific antibody depletion of NKT cells in vivo abrogated the development of ACAID; and (c) anti-CD1 monoclonal antibody treatment of wild-type mice prevented ACAID development. Significantly, CD1-reactive NKT cells were not required for intravenously induced systemic tolerance, thereby establishing that different mechanisms mediate development of tolerance to antigens inoculated by these routes. A critical role for NKT cells in the development of systemic tolerance associated with an immune-privileged site suggests a mechanism involving NKT cells in self-tolerance and their defects in autoimmunity.

Key Words: innate immunity , immune deviation , anterior chamber–associated immune deviation , autoimmunity , i.v. tolerance


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