BCL6 controls the expression of the B7-1/CD80 costimulatory receptor in germinal center B cells.

BCL6 controls the expression of the B7-1/CD80 costimulatory receptor in germinal center B cells.
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BCl6控制生发中心B细胞中B7-1/CD80共刺激受体的表达。

DOI:
10.1084/jem.20021395
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发表时间:
2003-07-21
影响因子:
15.3
通讯作者:
Dalla-Favera, R
Dalla-Favera, R
中科院分区:
医学1区
文献类型:
--
作者:
Niu, HF;Cattoretti, G;Dalla-Favera, R

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BCL 6原癌基因编码一种转录抑制因子,是生发中心(GC)发育所必需的,并与GC衍生的B细胞淋巴瘤的发病机制有关。了解BCL 6在正常GC形成和淋巴瘤发生中的确切作用取决于对其转录抑制的直接靶基因的鉴定。在这里,我们报告说,BCL 6直接控制B7-1/CD 80的表达,共刺激受体参与B-T细胞相互作用的T细胞介导的抗体反应的发展至关重要。在CD 40信号传导后,CD 80基因的转录由核因子(NF)-κB转录因子诱导。我们的研究结果表明,BCL 6通过在体内结合其启动子区域并抑制NF-κB的转录激活来阻止CD 40诱导的CD 80表达。与BCL 6在抑制CD 80中的生理作用一致,这两种基因的表达在B细胞中是相互排斥的,并且BCL 6缺陷型小鼠显示出B细胞中CD 80的表达增加。结果提示,BCL 6可能直接调控B细胞与T细胞相互作用的能力。此外,这些发现意味着在表达失调的BCL 6基因的B细胞淋巴瘤中,T-B细胞相互作用可能被破坏。
The BCL6 proto-oncogene encodes a transcriptional repressor required for the development of germinal centers (GCs) and implicated in the pathogenesis of GC-derived B cell lymphoma. Understanding the precise role of BCL6 in normal GC formation and in lymphomagenesis depends on the identification of genes that are direct targets of its transcriptional repression. Here we report that BCL6 directly controls the expression of B7–1/CD80, a costimulatory receptor involved in B–T cell interactions critical for the development of T cell–mediated antibody responses. Upon CD40 signaling, transcription of the CD80 gene is induced by the nuclear factor (NF)-κB transcription factor. Our results show that BCL6 prevents CD40-induced expression of CD80 by binding its promoter region in vivo and suppressing its transcriptional activation by NF-κB. Consistent with a physiologic role for BCL6 in suppressing CD80, the expression of these two genes is mutually exclusive in B cells, and BCL6-defective mice show increased expression of CD80 in B cells. The results suggest that BCL6 may directly control the ability of B cell to interact with T cells during normal GC development. In addition, these findings imply that T–B cell interactions may be disrupted in B cell lymphoma expressing deregulated BCL6 genes.
DOI: 10.1182/blood.v90.11.4297.4297_4297_4306
发表时间: 1997-12-01
期刊: BLOOD
影响因子: 20.3
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发表时间: 1999-12-21
影响因子: 11.1
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影响因子: 56.9
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