Quantitative and temporal requirements revealed for Zap70 catalytic activity during T cell development.
Quantitative and temporal requirements revealed for Zap70 catalytic activity during T cell development.
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The catalytic activity of Zap-70 is crucial for T cell receptor (TCR) signaling, but the quantitative and temporal requirements for its function in thymocyte development are not known. Using a chemical-genetic system to selectively and reversibly inhibit Zap-70 catalytic activity in a model of synchronized thymic selection, we showed that CD4+CD8+ thymocytes integrate multiple, transient, Zap-70-dependent signals over more than 36 h to reach a cumulative threshold for positive selection, whereas one hour of signaling was sufficient for negative selection. Titration of Zap-70 activity resulted in graded reductions in positive and negative selection but did not decrease the cumulative TCR signals integrated by positively selected OT-I cells, revealing heterogeneity, even among CD4+CD8+ thymocytes expressing identical TCRs undergoing positive selection.
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DOI:
10.1084/jem.20082902
发表时间:
2009-10-26
期刊:
The Journal of experimental medicine
影响因子:
--
作者:
Hsu LY;Tan YX;Xiao Z;Malissen M;Weiss A
通讯作者:
Weiss A
影响因子:
7.3
作者:
Mukherjee S;Zhu J;Zikherman J;Parameswaran R;Kadlecek TA;Wang Q;Au-Yeung B;Ploegh H;Kuriyan J;Das J;Weiss A
通讯作者:
Weiss A
影响因子:
64.8
作者:
Daniels, Mark A.;Teixeiro, Emma;Palmer, Ed
通讯作者:
Palmer, Ed
影响因子:
64.8
作者:
NEGISHI, I;MOTOYAMA, N;LOH, DY
通讯作者:
LOH, DY
影响因子:
16
作者:
Rolli, V;Gallwitz, M;Reth, M
通讯作者:
Reth, M