Bruton's tyrosine kinase is required for activation of IkappaB kinase and nuclear factor kappaB in response to B cell receptor engagement.

Bruton's tyrosine kinase is required for activation of IkappaB kinase and nuclear factor kappaB in response to B cell receptor engagement.
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DOI:
10.1084/jem.191.10.1745
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发表时间:
2000-05-15
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Khan WN
Khan WN
中科院分区:
其他
文献类型:
--
作者:
Petro JB;Rahman SM;Ballard DW;Khan WN

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编码布鲁顿氏酪氨酸激酶(btk)的基因突变导致B细胞缺陷性疾病,即人类的X连锁无丙种球蛋白血症(XLA)和小鼠的X连锁免疫缺陷(xid)。体内和体外研究表明,BTK蛋白对于响应B细胞抗原受体(BCR)刺激的B细胞存活、细胞周期进展和增殖是必需的。BCR刺激导致转录因子核因子(NF)-κB活化,进而调节控制B细胞生长的基因。我们现在证明,已知引起xid表型的btk无效突变阻止了BCR诱导的NF-κB活化。这种缺陷可以通过用野生型BTK重建来挽救。该突变还干扰BCR介导的IκB激酶(IKK)活化,IKK通常靶向NF-κB抑制剂IκBα降解。总之,这些发现表明BTK将IKK和NF-κB偶联至BCR。干扰这种偶联机制可能有助于在XLA和xid中观察到的B细胞缺陷。
Mutations in the gene encoding Bruton's tyrosine kinase (btk) cause the B cell deficiency diseases X-linked agammaglobulinemia (XLA) in humans and X-linked immunodeficiency (xid) in mice. In vivo and in vitro studies indicate that the BTK protein is essential for B cell survival, cell cycle progression, and proliferation in response to B cell antigen receptor (BCR) stimulation. BCR stimulation leads to the activation of transcription factor nuclear factor (NF)-κB, which in turn regulates genes controlling B cell growth. We now demonstrate that a null mutation in btk known to cause the xid phenotype prevents BCR-induced activation of NF-κB. This defect can be rescued by reconstitution with wild-type BTK. This mutation also interferes with BCR-directed activation of IκB kinase (IKK), which normally targets the NF-κB inhibitor IκBα for degradation. Taken together, these findings indicate that BTK couples IKK and NF-κB to the BCR. Interference with this coupling mechanism may contribute to the B cell deficiencies observed in XLA and xid.
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