Dynamic regulation of CD28 conformation and signaling by charged lipids and ions
Dynamic regulation of CD28 conformation and signaling by charged lipids and ions
复制标题
带电脂质和离子对 CD28 构象和信号传导的动态调节
DOI:
10.1038/nsmb.3489
复制
发表时间:
2017-10
影响因子:
16.8
通讯作者:
Xu C
中科院分区:
文献类型:
--
作者:
Yang W;Pan W;Chen S;Trendel N;Jiang S;Xiao F;Xue M;Wu W;Peng Z;Li X;Ji H;Liu X;Jiang H;Wang H;Shen H;Dushek O;Li H;Xu C
CD28 provides an essential costimulatory signal for T cell activation, and its function is critical in antitumor immunity. However, the molecular mechanism of CD28 transmembrane signaling remains elusive. Here we show that the conformation and signaling of CD28 are regulated by two counteractive charged factors, acidic phospholipids and Ca2+ions. NMR spectroscopy analyses showed that acidic phospholipids can sequester CD28 signaling motifs within the membrane, thereby limiting CD28 basal signaling. T cell receptor (TCR) activation induced an increase in the local Ca2+concentration around CD28, and Ca2+directly disrupted CD28-lipid interaction, leading to opening and signaling of CD28. We observed that the TCR, Ca2+, and CD28 together form a dual-positive-feedback circuit that substantially amplifies T cell signaling and thus increases antigen sensitivity. This work unravels a new regulatory mechanism for CD28 signaling and thus contributes to the understanding of the dependence of costimulation signaling on TCR signaling and the high sensitivity of T cells.
登录
查看更多内容
影响因子:
7.3
作者:
Dobbins J;Gagnon E;Godec J;Pyrdol J;Vignali DA;Sharpe AH;Wucherpfennig KW
通讯作者:
Wucherpfennig KW
DOI:
10.1038/nri3405
发表时间:
2013-04
期刊:
Nature reviews. Immunology
影响因子:
--
作者:
通讯作者:
--
DOI:
10.1002/wsbm.1245
发表时间:
2014-01
影响因子:
7.9
作者:
Chylek, Lily A.;Harris, Leonard A.;Tung, Chang-Shung;Faeder, James R.;Lopez, Carlos F.;Hlavacek, William S.
通讯作者:
Hlavacek, William S.
影响因子:
20.3
作者:
Cordoba, Shaun-Paul;Choudhuri, Kaushik;van der Merwe, P. Anton
通讯作者:
van der Merwe, P. Anton
DOI:
10.1073/pnas.1503286112
发表时间:
2015-03
期刊:
Proceedings of the National Academy of Sciences
影响因子:
--
作者:
Ruijun Tian;Haopeng Wang;G. Gish;E. Petsalaki;A. Pasculescu;Yu Shi;M. Mollenauer;R. Bagshaw;
通讯作者:
Ruijun Tian;Haopeng Wang;G. Gish;E. Petsalaki;A. Pasculescu;Yu Shi;M. Mollenauer;R. Bagshaw;