Multiple transcription factors in 5'-flanking region of human polymeric Ig receptor control its basal expression.

Multiple transcription factors in 5'-flanking region of human polymeric Ig receptor control its basal expression.
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人聚合 Ig 受体 5 侧翼区域的多个转录因子控制其基础表达。

DOI:
10.1152/ajpgi.00420.2001
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发表时间:
2002
期刊:
American journal of physiology. Gastrointestinal and liver physiology.
影响因子:
--
通讯作者:
Martin,MartinG
Martin,MartinG
中科院分区:
--
文献类型:
--
作者:
Solorzano-Vargas,RSergio;Wang,Jiafang;Jiang,Lingling;Tsai,HughV;Ontiveros,LuisO;Vazir,MuktaA;Aguilera,RenatoJ;Martin,MartinG

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聚合Ig受体(pIgR)是粘膜免疫系统的重要组成部分,在小肠中表达量最大。在这项研究中,我们描述了该基因核心启动子区域的初步表征。在Caco-2和HT-29细胞中支持嵌合启动子-报告子结构的表达,dnasei足迹分析显示在核心启动子区域内有一个大的蛋白质复合物。位点定向诱变实验确定,该区域内的元件可以增强或抑制humanpIgRpromoter的基础活性。对核心启动子内重叠寡核苷酸的带移分析鉴定出8种不同的复合物;大多数复合物的丰度在融合后的细胞中增强。总之,我们报道了人类pigr启动子的特征,以及八种不同的核复合物在Caco-2细胞中控制该基因基础表达的重要作用。
The polymeric Ig receptor (pIgR) is a critical component of the mucosal immune system and is expressed in largest amounts in the small intestine. In this study, we describe the initial characterization of the core promoter region of this gene. Expression of chimeric promoter-reporter constructs was supported in Caco-2 and HT-29 cells, andDNaseI footprint analysis revealed a large protein complex within the core promoter region. Site-directed mutagenesis experiments determined that elements within this region serve to either augment or repress basal activity of the humanpIgRpromoter. Band shift assays of overlapping oligonucleotides within the core promoter identified eight distinct complexes; the abundance of most complexes was enhanced in post-confluent cells. In summary, we report the characterization of the humanpIgRpromoter and the essential role that eight different nuclear complexes have in controlling basal expression of this gene in Caco-2 cells.
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