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Yin-Yang of costimulation: crucial controls of immune tolerance and function Nurieva RI; Liu X; Dong CImmunol Rev 2009[May]; 229 (1): 88-100In addition to signals from the T-cell receptor complex, it has been recognized for many years that a 'second' signal, most notably from CD28, is also important in T-cell activation. In the recent years, many new members of CD28 family as well as the molecules that share structural homology to CD28 ligands CD80 and CD86 have been discovered. Interestingly, some of these proteins function to dampen T-cell activation and regulate the induction of T-cell tolerance. Therefore, positive and negative costimulation are the two sides of the coin to fine tune T-cell receptor signaling to determine the outcome of T-cell receptor engagement-tolerance versus function.|*Immune Tolerance[MESH]|*Lymphocyte Activation[MESH]|Animals[MESH]|Antibody Formation/immunology[MESH]|Antigens, CD/immunology/metabolism[MESH]|Antigens, Differentiation, T-Lymphocyte[MESH]|Apoptosis Regulatory Proteins/immunology/metabolism[MESH]|Autoimmunity/immunology[MESH]|B7 Antigens[MESH]|B7-1 Antigen/immunology/metabolism[MESH]|CD28 Antigens/*immunology/metabolism[MESH]|Humans[MESH]|Inducible T-Cell Co-Stimulator Protein[MESH]|Receptors, Antigen, T-Cell/*immunology/metabolism[MESH]|Receptors, Immunologic/immunology/metabolism[MESH]|Signal Transduction/immunology[MESH]|T-Lymphocytes/*immunology/metabolism[MESH] |
