T-cell egress from the thymus: Should I stay or should I go?

Journal of Leukocyte Biology
Kieran D JamesGraham Anderson

Abstract

T-cells bearing the αβTCR play a vital role in defending the host against foreign pathogens and malignant transformation of self. Importantly, T-cells are required to remain tolerant to the host's own cells and tissues in order to prevent self-reactive responses that can lead to autoimmune disease. T-cells achieve the capacity for self/nonself discrimination by undergoing a highly selective and rigorous developmental program during their maturation in the thymus. This organ is unique in its ability to support a program of T-cell development that ensures the establishment of a functionally diverse αβTCR repertoire within the peripheral T-cell pool. The thymus achieves this by virtue of specialized stromal microenvironments that contain heterogeneous cell types, whose organization and function underpins their ability to educate, support, and screen different thymocyte subsets through various stages of development. These stages range from the entry of early T-cell progenitors into the thymus, through to the positive and negative selection of the αβTCR repertoire. The importance of the thymus medulla as a site for T-cell tolerance and the exit of newly generated T-cells into the periphery is well established. In this review, we sum...Continue Reading

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