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The Journal of Immunology, 2005, 174: 1783-1786.
Copyright © 2005 by The American Association of Immunologists


CUTTING EDGE

Cutting Edge: Contact-Mediated Suppression by CD4+CD25+ Regulatory Cells Involves a Granzyme B-Dependent, Perforin-Independent Mechanism1

David C. Gondek2,*, Li-Fan Lu2,*, Sergio A. Quezada*, Shimon Sakaguchi{dagger} and Randolph J. Noelle3,*

* Department of Microbiology and Immunology, Dartmouth Medical School and Norris Cotton Cancer Center, Lebanon, NH 03756; and {dagger} Department of Experimental Pathology, Institute for Frontier Medical Sciences, and Department of Transplantation and Immunology, Faculty of Medicine, Kyoto University, Kyoto, Japan

CD4+CD25+ regulatory T cells (Treg) are potent immunosuppressive cells that are pivotal in the regulation of peripheral tolerance. In this report, we identify granzyme B (GZ-B) as one of the key components of Treg-mediated suppression. Induction of regulatory activity is correlated with the up-regulation of GZ-B expression. Proof of a functional involvement of GZ-B in contact-mediated suppression by Treg is shown by the reduced ability of Treg from GZ-B–/– mice to suppress as efficiently as Treg from WT mice. GZ-B-mediated suppression is perforin independent, because suppression by Treg from perforin–/– and WT is indistinguishable. Additionally, suppression mediated by Treg appears to be mediated, in part, by the induction of apoptosis in the CD4+CD25 effector cell. In summary, GZ-B is one of the key mechanisms through which CD4+CD25+ Treg induce cell contact-mediated suppression.




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L.-F. Lu, D. C. Gondek, Z. A. Scott, and R. J. Noelle
NF{kappa}B-Inducing Kinase Deficiency Results in the Development of a Subset of Regulatory T Cells, which Shows a Hyperproliferative Activity upon Glucocorticoid-Induced TNF Receptor Family-Related Gene Stimulation
J. Immunol., August 1, 2005; 175(3): 1651 - 1657.
[Abstract] [Full Text] [PDF]


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J. Immunol.Home page
I. L. King and B. M. Segal
Cutting Edge: IL-12 Induces CD4+CD25- T Cell Activation in the Presence of T Regulatory Cells
J. Immunol., July 15, 2005; 175(2): 641 - 645.
[Abstract] [Full Text] [PDF]


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J. Immunol.Home page
L. Pace, C. Pioli, and G. Doria
IL-4 Modulation of CD4+CD25+ T Regulatory Cell-Mediated Suppression
J. Immunol., June 15, 2005; 174(12): 7645 - 7653.
[Abstract] [Full Text] [PDF]




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