Lysophosphatidylserine suppression of T-cell activation via GPR174 requires Gαs proteins.

Lysophosphatidylserine suppression of T-cell activation via GPR174 requires Gαs proteins.
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DOI:
10.1111/imcb.12025
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发表时间:
2018-04
影响因子:
4
通讯作者:
Cyster JG
Cyster JG
中科院分区:
医学3区
文献类型:
--
作者:
Barnes MJ;Cyster JG

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G蛋白偶联受体调节T细胞活性和效应子功能的各个方面。最近,我们发现GPR 174介导了由极性脂质溶血磷脂酰丝氨酸(LysoPS)诱导的体外T细胞增殖抑制。在这里,我们研究了这种途径的体内活性,并表征了所涉及的机制。使用亚致死辐射或调节性T细胞耗竭诱导的T细胞增殖的体内模型,我们表明GPR 174表达可以抑制T细胞增殖。体外实验证实,Gαs G蛋白是LysoPS/GPR 174介导的T细胞增殖抑制所必需的。从机制上讲,LysoPS通过GPR 174和Gαs抑制活化T细胞产生IL-2,并限制活化标志物CD 25和CD 69的上调。总之,我们的研究结果将GPR 174鉴定为大量表达的Gα s依赖性受体,其可以负调节幼稚T细胞活化。溶血磷脂酰丝氨酸(LysoPS)可以通过GPR 174抑制T细胞增殖。在这里,我们表明,GPR 174负调节体内T细胞增殖的稳态增殖和调节T细胞耗竭模型。从机制上讲,LysoPS减少了早期T细胞活化和IL-2的产生,并需要G(alpha)s G蛋白亚基来介导这些作用。
G protein-coupled receptors regulate diverse aspects of T cell activity and effector function. Recently, we showed that GPR174 mediates the suppression of T cell proliferation in vitro induced by the polar lipid lysophosphatidylserine (LysoPS). Here, we investigated the in vivo activity of this pathway and characterized the mechanisms involved. Using in vivo models of T cell proliferation induced by sublethal irradiation or regulatory T cell depletion, we show that GPR174 expression can constrain T cell proliferation. In vitro experiments established that Gαs G proteins are needed for LysoPS/GPR174-mediated suppression of T cell proliferation. Mechanistically, LysoPS acts via GPR174 and Gαs to suppress IL-2 production by activated T cells and limit upregulation of the activation markers CD25 and CD69. Together, our findings identify GPR174 as an abundantly expressed Gαs-dependent receptor that can negatively regulate naive T cell activation. Lysophosphatidylserine (LysoPS) can suppress T cell proliferation via GPR174. Here, we show that GPR174 negatively regulates T cell proliferation in vivo using models of homeostatic proliferation and regulatory T cell depletion. Mechanistically, LysoPS reduced early T cell activation and IL-2 production, and required G(alpha)s G-protein subunits to mediate these effects.
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