MHC class II-dependent T-T interactions create a diverse, functional and immunoregulatory reaction circle

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Lee, You Jeong; Jung, Kyeong Cheon; Park, Seong Hoe
Issue Date
Immunol Cell Biol. 2009; 87(1): 65-71
AnimalsCD4-Positive T-Lymphocytes/*immunologyCell Communication/*immunologyClonal DeletionHistocompatibility Antigens Class II/*immunologyHumansNatural Killer T-Cells/*immunologyThymus Gland/*immunologyTranscription Factors/immunology
Unlike conventional T cells, innate-like T cells such as natural killer (NK) T cells are selected by homotypic T-cell interactions. Recently, a few reports have shown that T-T CD4(+) T cells can be generated in a similar manner to that for NKT cells. These two types of cells share common functional properties such as rapid response to antigenic encounters and the potential for a panoply of cytokine secretion. However, T-T CD4(+) T cells differ from NKT cells in that they are restricted by highly polymorphic major histocompatibility complex (MHC) II molecules and have a diverse T-cell receptor repertoire. Additional example of T-T interactions was recently reported in which peripheral T cells re-circulate to the thymus and participate in the thymocyte selection process. In this review, we dissect the cellular mechanisms underlying the production of T-T CD4(+) and NKT cells, with particular emphasis on the differences between these two T-cell prototypes. Finally, we propose that T-T CD4(+) T cells serve two major functions: one as an acute-phase reactant against viral infection and the other is the generation of anti-ergotypic CD4(+) T cells for regulatory purposes. All of these features make it possible to create a diverse set of functional cells through MHC class II-restricted T-T interactions.
0818-9641 (Print)
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College of Medicine/School of Medicine (의과대학/대학원)Pathology (병리학전공)Journal Papers (저널논문_병리학전공)
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