The ubiquitin modifying enzyme A20 restricts B cell survival and prevents autoimmunity.
The ubiquitin modifying enzyme A20 restricts B cell survival and prevents autoimmunity.
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DOI:
10.1016/j.immuni.2010.07.017
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发表时间:
2010-08-27
期刊:
影响因子:
32.4
通讯作者:
Ma A
中科院分区:
文献类型:
--
作者:
Tavares RM;Turer EE;Liu CL;Advincula R;Scapini P;Rhee L;Barrera J;Lowell CA;Utz PJ;Malynn BA;Ma A
A20 is a ubiquitin modifying enzyme that restricts NF-κB signals and protects cells against tumor necrosis factor (TNF) induced programmed cell death. Given recent data linking A20 (TNFAIP3) with human B cell lymphomas and systemic lupus erythematosus (SLE), we have generated mice bearing a floxed allele of Tnfaip3 to interrogate A20’s roles in regulating B cell functions. A20-deficient B cells are hyper-responsive to multiple stimuli and display exaggerated NF-κB responses to CD40 induced signals. Mice expressing absent or hypomorphic amounts of A20 in B cells possess elevated numbers of germinal center B cells, autoantibodies, and glomerular immunoglobulin deposits. A20 deficient B cells are resistant to Fas mediated cell death, likely due to increased expression of NF-κB-dependent anti-apoptotic proteins such as Bcl-x. These findings show that A20 can restrict B cell survival, while A20 protects other cells from TNF induced cell death. Our studies demonstrate how reduced A20 expression predisposes to autoimmunity.
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