Cutting edge: the PTPN22 allelic variant associated with autoimmunity impairs B cell signaling.

Cutting edge: the PTPN22 allelic variant associated with autoimmunity impairs B cell signaling.
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DOI:
10.4049/jimmunol.0713370
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发表时间:
2009-03-15
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Buckner JH
Buckner JH
中科院分区:
其他
文献类型:
--
作者:
Arechiga AF;Habib T;He Y;Zhang X;Zhang ZY;Funk A;Buckner JH

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PTPN 22是编码蛋白酪氨酸磷酸酶Lyp的基因。错义突变将1858位残基从胞嘧啶变为胸苷(1858 C/T)与多种自身免疫性疾病相关。研究已经证明Lyp对TCR信号传导具有抑制作用;然而,在与1858 T变体相关的所有疾病中存在自身抗体,并且最近的证据表明1858 T携带者的B细胞中的Ca 2+通量改变,表明Lyp在B细胞信号传导中的作用。在这项研究中,我们表明,B细胞信号转导受损的个人谁表达的变体。这种信号传导缺陷的特征在于增殖缺陷、关键信号传导蛋白磷酸化的减少,并且通过抑制Lyp而逆转。这些发现表明,PTPN 22 1858 T变体改变BCR信号传导,并在PTPN 22 1858 T变体促成自身免疫的机制中涉及B细胞。
PTPN22 is a gene encoding the protein tyrosine phosphatase Lyp. A missense mutation changing residue 1858 from cytosine to thymidine (1858C/T) is associated with multiple autoimmune disorders. Studies have demonstrated that Lyp has an inhibitory effect on TCR signaling; however, the presence of autoantibodies in all of the diseases associated with the 1858T variant and recent evidence that Ca2+ flux is altered in B cells of 1858T carriers indicate a role for Lyp in B cell signaling. In this study we show that B cell signal transduction is impaired in individuals who express the variant. This defect in signaling is characterized by a deficit in proliferation, a decrease in phosphorylation of key signaling proteins, and is reversed by inhibition of Lyp. These findings suggest that the PTPN22 1858T variant alters BCR signaling and implicate B cells in the mechanism by which the PTPN22 1858T variant contributes to autoimmunity.
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