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Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Immunol+Res 2016 ; 64 (2): 565-75 Nephropedia Template TP
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Ikaros, Helios, and Aiolos protein levels increase in human thymocytes after ? selection #MMPMID26645971
Mitchell JL; Seng A; Yankee TM
Immunol Res 2016[Apr]; 64 (2): 565-75 PMID26645971show ga
In human T cell development, the mechanisms that regulate cell fate decisions after TCR? expression remain unclear. We defined the stages of T cell development that flank TCR? expression and found distinct patterns of human T cell development. In half the subjects, T cell development progressed from the CD4?CD8? double negative (DN) stage to the CD4+CD8+ double positive (DP) stage through an immature single positive (ISP) CD4+ intermediate. However, in some patients, CD4 and CD8 were expressed simultaneously and the ISP population was small. In each group of patients, CD3? ISP and DP thymocytes were subdivided into ISP1, ISP2, DP1, DP2, DP3, DP4, and DP5 developmental stages according to their expression of CD28, CD44, CD1a, CD7, CD45RO, and CD38. The ISP2, DP2, and DP3 thymocyte populations proliferated more robustly than ISP1 and DP1 and expressed markers consistent with TCR? expression. After the DP3 stage, proliferation returned to baseline levels. We then analyzed protein levels of Ikaros, Helios, and Aiolos, the three Ikaros family members most abundantly expressed in human thymocytes. Ikaros and Helios expression increased transiently at the ISP2, DP2, and DP3 populations. Aiolos expression also increased at the ISP2, DP2, and DP3 stages, but its expression remained elevated throughout the DP4 and DP5 stages. In summary, we propose a model of human T cell development that reflects the asynchronous nature of TCR? expression and we define the subpopulations of thymocytes that are highly proliferative and express Ikaros family members.