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lüll Emerging concepts in CD8(+) T regulatory cells Niederkorn JYCurr Opin Immunol 2008[Jun]; 20 (3): 327-31CD8(+) T regulatory cells (T regs) are elicited by unique antigen presenting cells during viral infections, by manipulation of co-stimulatory molecules, or in the development of tumors. CD8(+) T regs display antigen-specificity, which is most exquisitely manifested by the HLA-E-restricted cytolytic CD8(+) T regs in MS. There is evidence that some CD8(+) T regs also express organ specificity. In many cases, IFN-gamma is required for either the induction or expression of CD8(+) T regs. CD8(+) T regs can produce suppression directly by killing immune cells or indirectly by co-opting other cells to elaborate end-stage suppressive molecules such as TGF-beta, IL-10, and indoleamine dioxygenase (IDO).|Animals[MESH]|Antigens/immunology[MESH]|CD8-Positive T-Lymphocytes/*immunology[MESH]|Lymphocyte Activation[MESH]|Multiple Sclerosis/immunology[MESH]|Neoplasms/immunology[MESH]|T-Lymphocyte Subsets/*immunology[MESH]|T-Lymphocytes, Regulatory/immunology[MESH] |