The inositol 5-phosphatase INPP5B regulates B cell receptor clustering and signaling.

The inositol 5-phosphatase INPP5B regulates B cell receptor clustering and signaling.
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DOI:
10.1083/jcb.202112018
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发表时间:
2022-09-05
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
--
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其他
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Droubi等鉴定了肌醇5-磷酸酶INPP 5 B在B细胞受体的聚集和信号传导中的作用。这些作用由PI(4,5)P2的INPP 5 B依赖性水解介导,以控制皮质肌动蛋白和B细胞受体动力学。在抗原结合后,B细胞受体(BCR)经历聚集以形成信号体,其传播正常B细胞发育和生理学所需的下游信号传导。BCR聚集依赖于皮质肌动蛋白网络的重塑,但在这种情况下,调节肌动蛋白重塑的机制仍然不清楚。在这项研究中,我们确定了肌醇5-磷酸酶INPP 5 B作为一个关键的调节肌动蛋白重塑,BCR集群,和下游信号在抗原刺激的B细胞。INPP 5 B通过肌醇脂质PI(4,5)P2的去磷酸化作用,这又是肌动蛋白分解、BCR动员和细胞在固定的表面抗原上扩散所必需的。这些作用可以通过cofilin增加的肌动蛋白切断和ezrin与质膜连接的肌动蛋白的损失来解释,这两者都对INPP 5 B依赖性PI(4,5)P2水解敏感。因此,INPP 5 B是BCR信号传导中的新参与者,并且可能代表用于治疗由异常BCR信号传导引起的B细胞恶性肿瘤的有吸引力的靶标。
Droubi et al. identify a role for the inositol 5-phosphatase INPP5B in clustering and signaling of the B cell receptor. These effects are mediated by INPP5B-dependent hydrolysis of PI(4,5)P2 to control cortical actin and B cell receptor dynamics. Upon antigen binding, the B cell receptor (BCR) undergoes clustering to form a signalosome that propagates downstream signaling required for normal B cell development and physiology. BCR clustering is dependent on remodeling of the cortical actin network, but the mechanisms that regulate actin remodeling in this context remain poorly defined. In this study, we identify the inositol 5-phosphatase INPP5B as a key regulator of actin remodeling, BCR clustering, and downstream signaling in antigen-stimulated B cells. INPP5B acts via dephosphorylation of the inositol lipid PI(4,5)P2 that in turn is necessary for actin disassembly, BCR mobilization, and cell spreading on immobilized surface antigen. These effects can be explained by increased actin severing by cofilin and loss of actin linking to the plasma membrane by ezrin, both of which are sensitive to INPP5B-dependent PI(4,5)P2 hydrolysis. INPP5B is therefore a new player in BCR signaling and may represent an attractive target for treatment of B cell malignancies caused by aberrant BCR signaling.
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