Interplay of Sps and poly(C) binding protein 1 on the mu-opioid receptor gene expression.

Interplay of Sps and poly(C) binding protein 1 on the mu-opioid receptor gene expression.
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Sps 和 Poly(C) 结合蛋白 1 对 mu-阿片受体基因表达的相互作用。

DOI:
10.1016/j.bbrc.2006.04.117
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发表时间:
2006
期刊:
Biochemical and biophysical research communications.
影响因子:
--
通讯作者:
Ko,JaneL
Ko,JaneL
中科院分区:
--
文献类型:
--
作者:
Rivera-Gines,Aida;Cook,RyanJ;Loh,HoraceH;Ko,JaneL

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小鼠μ阿片受体(MOR)基因的近端启动子是指导脑中MOR-1基因表达的显性启动子。 Sp1/Sp3 (Sps) 和 Poly(C) 结合蛋白 1 (PCBP) 与 MOR 近端启动子的顺式元件结合。使用不含 Sps 和 PCBP 的 SL2 细胞研究了 Sps 和 PCBP 之间的功能相互作用以及它们在 MOR 近端核心启动子上的各自作用。每个因子对启动子的贡献不同,活性顺序为 Sp1>Sp3>PCBP。功能分析表明 Sps 和 PCBP 以相加方式相互作用。使用染色质免疫沉淀 (ChIP) 证明了单个 Sps 或 PCBP 与 MOR 近端启动子的体内结合。 Re-ChIP 测定进一步表明 Sps 和 PCBP 同时结合到近端启动子,表明 Sps 和 PCBP 之间存在生理相关的通讯。总的来说,结果证明 Sps 和 PCBP 之间的功能协调有助于细胞特异性 MOR 基因表达。
The proximal promoter of mouse μ-opioid receptor (MOR) gene is the dominant promoter for directing MOR-1 gene expression in brain. Sp1/Sp3 (Sps) and poly(C) binding protein 1 (PCBP) bind to a cis-element of MOR proximal promoter. Functional interaction between Sps and PCBP and their individual roles on MOR proximal core promoter were investigated using SL2 cells, devoid of Sps and PCBP. Each factor contributed differentially to the promoter, with a rank order of activity Sp1>Sp3>PCBP. Functional analysis suggested the interplay of Sps and PCBP in an additive manner. The in vivo binding of individual Sps or PCBP to MOR proximal promoter was demonstrated using chromatin immunoprecipitation (ChIP). Re-ChIP assays further suggested simultaneous bindings of Sps and PCBP to the proximal promoter, indicating physiologically relevant communication between Sps and PCBP. Collectively, results documented that a functional coordination between Sps and PCBP contributed to cell-specific MOR gene expression.
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