Abstract:
:EBV-encoded latent membrane protein 1 (LMP1) is critical for EBV-driven B-cell transformation and most EBV-associated malignancies and is also implicated in exacerbation of autoimmunity. LMP1 functionally mimics the TNFR superfamily member CD40, but LMP1-induced signals and downstream B-cell functions are amplified and sustained compared with those mediated by CD40. CD40 and LMP1 both depend upon TNFR-associated factor (TRAF) adaptor molecules to mediate signaling but use them differently. LMP1 is dependent upon TRAFs 3 and 5 to deliver B-cell activation signals, while CD40 predominantly uses TRAFs 2 and 6 for this purpose. Both LMP1 and CD40 functions in B cells require TRAF6, which physically associates with both receptors but via different binding sites. In B-cell CD40 signaling, TRAF6 is required for a particular subset of CD40-dependent immune functions in vivo. Inasmuch as CD40 and LMP1 use other TRAFs differentially, we predicted that TRAF6 is critical for a specific subset of LMP1 functions in vivo and that this subset will be overlapping but distinct from the TRAF6-requiring functions of CD40. This study tests this prediction using a B-cell-specific TRAF6-deficient mouse model. We found that B-cell TRAF6 is important for LMP1-mediated antibody and autoantibody production in mice, as well as germinal center formation, but not the secondary lymphoid organ enlargement that results from LMP1 transgenic expression. Results highlight differential TRAF6 requirements for specific B-cell functions by LMP1 versus CD40. These differences may make important contributions to the contrasts between normally regulated CD40 versus pathogenic LMP1-mediated signals.
journal_name
Int Immunoljournal_title
International immunologyauthors
Arcipowski KM,Stunz LL,Bishop GAdoi
10.1093/intimm/dxt052subject
Has Abstractpub_date
2014-03-01 00:00:00pages
149-58issue
3eissn
0953-8178issn
1460-2377pii
dxt052journal_volume
26pub_type
杂志文章abstract::The Ig heavy chain (IgH) locus is controlled by multiple regulatory sequences mapping both within the IgH transcription unit (E mu) and downstream (3') of IgH coding sequences (hs3a, hs1,2, hs3b and hs4). Enhancer knockout studies in mice have implicated E mu in the control of IgH variable region gene assembly, but si...
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pub_type: 杂志文章
doi:10.1093/intimm/6.1.81
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pub_type: 杂志文章
doi:10.1093/intimm/7.5.843
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doi:10.1093/intimm/10.12.1801
更新日期:1998-12-01 00:00:00
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journal_title:International immunology
pub_type: 杂志文章
doi:10.1093/intimm/13.11.1383
更新日期:2001-11-01 00:00:00
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journal_title:International immunology
pub_type: 杂志文章
doi:10.1093/intimm/3.12.1253
更新日期:1991-12-01 00:00:00
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journal_title:International immunology
pub_type: 杂志文章,评审
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doi:10.1093/intimm/5.12.1609
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pub_type: 杂志文章
doi:10.1093/intimm/dxm043
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doi:10.1093/intimm/5.10.1259
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journal_title:International immunology
pub_type: 杂志文章
doi:10.1093/intimm/6.9.1323
更新日期:1994-09-01 00:00:00
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journal_title:International immunology
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doi:10.1093/intimm/2.1.51
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