Roles of the Src tyrosine kinases Lck and Fyn in regulating gammadeltaTCR signal strength.

Roles of the Src tyrosine kinases Lck and Fyn in regulating gammadeltaTCR signal strength.
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DOI:
10.1371/journal.pone.0008899
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发表时间:
2010-01-26
期刊:
影响因子:
3.7
通讯作者:
Hayes SM
Hayes SM
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Laird RM;Hayes SM

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LCK和FYN是酪氨酸激酶家族中的成员,是αβTCR偶联信号通路的重要组成部分。虽然人们普遍认为Lck和Fyn都对αβTcR的信号转导起正向调节作用,但最近的研究表明,Lck和Fyn在这一信号转导途径中具有不同的功能,其中Lck是αβTcR信号转导的正调节因子,Fyn是负调节因子。为了确定Lck和Fyn是否也差异地调节γδTcR信号转导,我们分析了Lck或Fyn表达水平降低的小鼠γδT细胞的发育和功能。我们发现,降低LCK或FYN水平改变了γδTCR信号反应的强度,低水平的LCK减弱了γδTCR信号的强度,低水平的FYN增强了γδTCR信号的强度。这些γδT细胞受体信号强度的改变不仅对αβ/γδ谱系的选择有深远影响,而且对γδ胸腺细胞成熟和γδT细胞效应器功能也有影响。这些结果表明,在γδT细胞生命的不同阶段,LCK和FYN的细胞水平在调节γδTCR信号反应的强度中起作用。
Lck and Fyn, members of the Src family of tyrosine kinases, are key components of the αβTCR-coupled signaling pathway. While it is generally accepted that both Lck and Fyn positively regulate signal transduction by the αβTCR, recent studies have shown that Lck and Fyn have distinct functions in this signaling pathway, with Lck being a positive regulator and Fyn being a negative regulator of αβTCR signal transduction. To determine whether Lck and Fyn also differentially regulate γδTCR signal transduction, we analyzed γδ T cell development and function in mice with reduced Lck or Fyn expression levels. We found that reducing Lck or Fyn levels altered the strength of the γδTCR signaling response, with low levels of Lck weakening γδTCR signal strength and low levels of Fyn augmenting γδTCR signal strength. These alterations in γδTCR signal strength had profound effects not only on αβ/γδ lineage choice, but also on γδ thymocyte maturation and γδ T cell effector function. These results indicate that the cellular levels of Lck and Fyn play a role in regulating the strength of the γδTCR signaling response at different stages in the life of the γδ T cell.
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