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Deprecated: Implicit conversion from float 247.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Eur+J+Immunol 2015 ; 45 (3): 652-60 Nephropedia Template TP
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Thymus medulla fosters generation of natural Treg cells, invariant ?? T cells, and invariant NKT cells: What we learn from intrathymic migration #MMPMID25615828
Cowan JE; Jenkinson WE; Anderson G
Eur J Immunol 2015[Mar]; 45 (3): 652-60 PMID25615828show ga
The organization of the thymus into distinct cortical and medullary regions enables it to control the step-wise migration and development of immature T-cell precursors. Such a process provides access to specialized cortical and medullary thymic epithelial cells at defined stages of maturation, ensuring the generation of self-tolerant and MHC-restricted conventional CD4+ and CD8+ ?? T cells. The migratory cues and stromal cell requirements that regulate the development of conventional ?? T cells have been well studied. However, the thymus also fosters the generation of several immunoregulatory T-cell populations that form key components of both innate and adaptive immune responses. These include Foxp3+ natural regulatory T cells, invariant ?? T cells, and CD1d-restricted invariant natural killer T cells (iNKT cells). While less is known about the intrathymic requirements of these nonconventional T cells, recent studies have highlighted the importance of the thymus medulla in their development. Here, we review recent findings on the mechanisms controlling the intrathymic migration of distinct T-cell subsets, and relate this to knowledge of the microenvironmental requirements of these cells.