The autoimmune-predisposing variant of lymphoid tyrosine phosphatase favors T helper 1 responses.

The autoimmune-predisposing variant of lymphoid tyrosine phosphatase favors T helper 1 responses.
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DOI:
10.1016/j.humimm.2012.12.017
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发表时间:
2013-05
期刊:
影响因子:
2.7
通讯作者:
Lie, Benedicte A.
Lie, Benedicte A.
中科院分区:
医学4区
文献类型:
--
作者:
Vang, Torkel;Landskron, Johannes;Viken, Marte K.;Oberprieler, Nikolaus;Torgersen, Knut M.;Mustelin, Tomas;Tasken, Kjetil;Tautz, Lutz;Rickert, Robert C.;Lie, Benedicte A.

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PTPN 22基因编码淋巴酪氨酸磷酸酶(LYP),其C1858 T单核苷酸多态性增加了白种人发生各种自身免疫性疾病的风险。尽管疾病相关的LYP等位基因(LYP* W 620)是一种功能获得性变体,其催化活性高于主要等位基因(LYP*R620),但仍不清楚LYP* W 620如何倾向于自身免疫。在这里,我们比较了LYP*R620或LYP* W 620纯合的健康人类供体中的T细胞信号传导和T细胞功能。一般来说,LYP* W 620的存在导致近端T细胞抗原受体介导的信号传导(例如β链磷酸化)减少,但增强CD 28相关信号传导(例如AKT活化)。两种LYP变体的改变的配体结合特性可以解释这些发现,因为LYP*R620与PI 3 K的p85亚基的相互作用更强。表达LYP*R620或LYP* W 620的细胞之间信号传导的变化也影响常规CD 4 + T细胞的分化。例如,LYP* W 620纯合供体显示出夸大的Th 1应答(例如IFNγ产生)和减少的Th 17应答(例如IL-17产生)。重要的是,虽然调节性T细胞通常抑制LYP*R620纯合子个体中Th 1介导的IFNγ产生,但这种抑制在LYP* W 620纯合子个体中丧失。总之,这些发现为与LYP* W 620相关的自身免疫表型提供了分子和细胞解释。
The C1858T single nucleotide polymorphism in PTPN22, which is the gene encoding lymphoid tyrosine phosphatase (LYP), confers increased risk for various autoimmune disorders in Caucasians. Although the disease-associated LYP allele (LYP*W620) is a gain-of-function variant that has higher catalytic activity than the major allele (LYP*R620), it is still unclear how LYP*W620 predisposes for autoimmunity. Here, we compared both T cell signaling and T cell function in healthy human donors homozygous for either LYP*R620 or LYP*W620. Generally, the presence of LYP*W620 caused reduced proximal T cell antigen receptor-mediated signaling (e.g. ζ chain phosphorylation) but augmented CD28-associated signaling (e.g. AKT activation). Altered ligand binding properties of the two LYP variants could explain these findings since LYP*R620 interacted more strongly with the p85 subunit of PI3K. Variation in signaling between cells expressing either LYP*R620 or LYP*W620 also affected the differentiation of conventional CD4+ T cells. For example, LYP*W620 homozygous donors displayed exaggerated Th1 responses (e.g. IFNγ production) and reduced Th17 responses (e.g. IL-17 production). Importantly, while regulatory T cells normally suppressed Th1-mediated IFNγ production in LYP*R620 homozygous individuals, such suppression was lost in LYP*W620 homozygous individuals. Altogether, these findings provide a molecular and cellular explanation for the autoimmune phenotype associated with LYP*W620.
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
发表时间: 2001-02-19
期刊: The Journal of experimental medicine
影响因子: --
作者:
Vang T;Torgersen KM;Sundvold V;Saxena M;Levy FO;Skålhegg BS;Hansson V;Mustelin T;Taskén K
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DOI: 10.1038/ng1673
发表时间: 2005-12-01
期刊: NATURE GENETICS
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期刊: HUMAN IMMUNOLOGY
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DOI: 10.1038/nchembio.916
发表时间: 2012-03-18
影响因子: 14.8
作者:
Vang, Torkel;Liu, Wallace H.;Delacroix, Laurence;Wu, Shuangding;Vasile, Stefan;Dahl, Russell;Yang, Li;Musumeci, Lucia;Francis, Dana;Landskron, Johannes;Tasken, Kjetil;Tremblay, Michel L.;Lie, Benedicte A.;Page, Rebecca;Mustelin, Tomas;Rahmouni, Souad;Rickert, Robert C.;Tautz, Lutz
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DOI: 10.4049/jimmunol.0713370
发表时间: 2009-03-15
期刊: Journal of immunology (Baltimore, Md. : 1950)
影响因子: --
作者:
Arechiga AF;Habib T;He Y;Zhang X;Zhang ZY;Funk A;Buckner JH
通讯作者: Buckner JH