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
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影响因子:
--
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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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DOI:
10.1083/jcb.200807047
发表时间:
2009-02-09
期刊:
The Journal of cell biology
影响因子:
--
作者:
Hao JJ;Liu Y;Kruhlak M;Debell KE;Rellahan BL;Shaw S
通讯作者:
Shaw S
影响因子:
32.4
作者:
Arana, Eloisa;Vehlow, Anne;Batista, Facundo D.
通讯作者:
Batista, Facundo D.
影响因子:
4.1
作者:
Currie, RA;Walker, KS;Lucocq, J
通讯作者:
Lucocq, J
影响因子:
7.3
作者:
Avalos AM;Ploegh HL
通讯作者:
Ploegh HL
影响因子:
48
作者:
Clark, Jonathan;Anderson, Karen E.;Juvin, Veronique;Smith, Trevor S.;Karpe, Fredrik;Wakelam, Michael J. O.;Stephens, Len R.;Hawkins, Phillip T.
通讯作者:
Hawkins, Phillip T.