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通过CD45调节B细胞抗原受体信号转导和酸化

L B Justement¹, K S Campbell, N C Chien

¹Department of Pediatrics, National Jewish Center for Immunology and Respiratory Medicine, Denver, CO.

Science (New York, N.Y.)

|June 28, 1991

概括

CD45是一种蛋白质氨酸酸酶,对于B细胞抗原受体信号传递至关重要. 它与受体进行物理相互作用,并通过控制蛋白质酸化来调节信号传导.

科学领域:

免疫学免疫学免疫学
细胞生物学细胞生物学
生物化学生物化学

背景情况:

CD45是一种具有胺酸酸酶活性的膜蛋白,在淋巴细胞中丰富.
它的酶活性表明它在通过淋巴细胞受体与氨酸激酶相关的跨膜信号转导中发挥作用.

研究的目的:

研究CD45在B细胞抗原受体信号传递中的作用.
为了确定CD45是否与B细胞抗原受体复合体有物理相互作用.
为了阐明CD45如何影响信号转导通路.

主要方法:

评估表达CD45.5的B细胞中的Ca(2+) 调动信号.
利用抗体治疗来研究CD45和膜免疫球蛋白M (mIgM) 之间的相互作用.
酶分析测定CD45对mIg相关蛋白的影响.

主要成果:

B细胞抗原受体信号传递,特别是Ca2+) 调动,需要CD45表达.
在抗体治疗时,CD45和mIgM被共同调节,这表明了物理关联.
CD45已被证明可以去化mIg相关信号复合体内的关键蛋白质.

结论:

CD45是B细胞抗原受体综合体的组成部分.
CD45通过调节相关蛋白质的酸化状态来调节抗原受体信号传导.

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