Activation of the COOH-terminal Src kinase (Csk) by cAMP-dependent protein kinase inhibits signaling through the T cell receptor.

Activation of the COOH-terminal Src kinase (Csk) by cAMP-dependent protein kinase inhibits signaling through the T cell receptor.
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cAMP 依赖性蛋白激酶激活 COOH 末端 Src 激酶 (Csk),抑制通过 T 细胞受体的信号传导。

DOI:
10.1084/jem.193.4.497
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发表时间:
2001-02-19
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Taskén K
Taskén K
中科院分区:
其他
文献类型:
--
作者:
Vang T;Torgersen KM;Sundvold V;Saxena M;Levy FO;Skålhegg BS;Hansson V;Mustelin T;Taskén K

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在T细胞中,cAMP依赖的蛋白激酶(PKA)I型与T细胞受体-CD3复合体(TCR/CD3)共定位,并通过一个未知的近端靶点抑制T细胞功能。在这里,我们研究这种PKA介导的免疫调节的机制。CAMP处理的Jurkat和正常T细胞减少了Lck介导的T细胞活化后TcR/CD3ζ链的酪氨酸磷酸化,并降低了Lck的活性。在cAMP抑制ζ链磷酸化的过程中,Lck中的Y505残基被羧基末端的Src激酶磷酸化,从而负性调节Lck。在体外和体内,PKA使S364处的CSK磷酸化,导致CSK活性增加两到四倍,这是cAMP介导的抑制TCR诱导的白介素2分泌所必需的。PKA I型和CSK都以发生近端T细胞活化的脂筏为靶点,在Forsklin处理的细胞中,CSK对RAFT相关LCK的磷酸化增加。我们提出了一种机制,即PKA通过激活CSK而与通过Src激酶的信号交叉,从而抑制T细胞的激活。
In T cells, cAMP-dependent protein kinase (PKA) type I colocalizes with the T cell receptor–CD3 complex (TCR/CD3) and inhibits T cell function via a previously unknown proximal target. Here we examine the mechanism for this PKA-mediated immunomodulation. cAMP treatment of Jurkat and normal T cells reduces Lck-mediated tyrosine phosphorylation of the TCR/CD3 ζ chain after T cell activation, and decreases Lck activity. Phosphorylation of residue Y505 in Lck by COOH-terminal Src kinase (Csk), which negatively regulates Lck, is essential for the inhibitory effect of cAMP on ζ chain phosphorylation. PKA phosphorylates Csk at S364 in vitro and in vivo leading to a two- to fourfold increase in Csk activity that is necessary for cAMP-mediated inhibition of TCR-induced interleukin 2 secretion. Both PKA type I and Csk are targeted to lipid rafts where proximal T cell activation occurs, and phosphorylation of raft-associated Lck by Csk is increased in cells treated with forskolin. We propose a mechanism whereby PKA through activation of Csk intersects signaling by Src kinases and inhibits T cell activation.
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