Induction of the human CYP1A2 enhancer by phorbol ester.

Induction of the human CYP1A2 enhancer by phorbol ester.
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佛波酯诱导人 CYP1A2 增强剂。

DOI:
10.1006/abbi.1997.0491
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发表时间:
1998
期刊:
Archives of biochemistry and biophysics.
影响因子:
--
通讯作者:
Pickwell,GV
Pickwell,GV
中科院分区:
--
文献类型:
--
作者:
Quattrochi,LC;Shih,H;Pickwell,GV

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3-甲基胆蒽(3MC)等多环芳烃诱导细胞色素(CYP) P4501A2可导致致癌芳香胺和杂环胺的生物活化。最近在人类 CYP1A2 基因转录起始位点上游约 2.2 kb 处发现了 3MC 响应元件。除了芳基碳氢化合物受体的结合位点之外,对该增强子的序列分析还发现了另外两个序列,称为 5'AP1 和 3'AP1,每个序列与佛波醇 12-O-十四酸 13-乙酸酯 (TPA) 响应元件共有序列具有完全同源性。经过 TPA 处理的 HepG2 细胞的核提取物可保护 5'AP1 和 3'AP1 序列免受 DNase I 的消化。凝胶迁移率变化和超变化分析表明,TPA 处理 HepG2 会导致 AP-1 蛋白、c-Jun、JunD 和 c-Fos 与这两个位点的结合活性增加。我们在 HepG2 中瞬时表达含有 5'AP1 和 3'AP1 位点 (−2.3pT81Luc) 的片段,或仅含有 3'AP1 位点 (−2.2pT81Luc) 的片段,克隆到含有受胸苷激酶启动子转录控制的荧光素酶基因的质粒中。用-2.3pT81Luc转染的细胞的TPA处理导致荧光素酶活性比未处理的对照细胞诱导大约三倍,而仅包含3'AP1位点的-2.2pT81Luc构建体显示出大约六倍的诱导。这些研究表明,除了多环芳烃之外,人类 CYP1A2 基因可能还受到肿瘤启动子的调节。
Induction of cytochrome (CYP) P4501A2 by such polycyclic aromatic hydrocarbons as 3-methylcholanthrene (3MC) can lead to the bioactivation of carcinogenic aromatic amines and heterocyclic amines. A 3MC response element was recently identified approximately 2.2 kb upstream of the transcription start site of the human CYP1A2 gene. Sequence analysis of this enhancer identified, in addition to a binding site for the aryl hydrocarbon receptor, two other sequences, referred to as 5′AP1 and 3′AP1, each with complete homology to the phorbol 12-O-tetradecanoate 13-acetate (TPA) response element consensus sequence. Nuclear extracts from TPA-treated HepG2 cells protected both the 5′AP1 and 3′AP1 sequences against digestion with DNase I. Gel mobility shift and supershift assays revealed that TPA treatment of HepG2 results in increased binding activity of the AP-1 proteins, c-Jun, JunD, and c-Fos, to both sites. We transiently expressed, in HepG2, either a fragment containing both the 5′AP1 and 3′AP1 sites (−2.3pT81Luc) or only the 3′AP1 site (−2.2pT81Luc) cloned into a plasmid containing the luciferase gene under transcriptional control of the thymidine kinase promoter. TPA treatment of cells transfected with −2.3pT81Luc resulted in an approximately threefold induction of luciferase activity over untreated control cells, while the −2.2pT81Luc construction containing only the 3′AP1 site displayed an approximately sixfold induction. These studies suggest that the human CYP1A2 gene may be regulated by tumor promoters in addition to polycyclic aromatic hydrocarbons.
人类 CYP1A2 基因组成型表达的调节:顺式元件及其与蛋白质的相互作用。
DOI: --
发表时间: 1995
期刊: Molecular pharmacology.
影响因子: --
作者:
Chung,I;Bresnick,E
通讯作者: Bresnick,E
DOI: 10.1016/s0021-9258(18)34459-4
发表时间: 1982-07
期刊: The Journal of biological chemistry
影响因子: --
作者:
M. Castagna;Y. Takai;K. Kaibuchi;K. Sano;U. Kikkawa;Y. Nishizuka
通讯作者: M. Castagna;Y. Takai;K. Kaibuchi;K. Sano;U. Kikkawa;Y. Nishizuka
人细胞色素 Cyp1A2 基因含有对 3-甲基胆蒽有反应的调节元件。
DOI: 10.1016/s0021-9258(19)38766-6
发表时间: 1989
影响因子: 3.6
作者:
L. Quattrochi;R. Tukey
通讯作者: R. Tukey
DOI: --
发表时间: 1992
期刊: The Journal of biological chemistry
影响因子: --
作者:
Li,Y;Jaiswal,AK
通讯作者: Jaiswal,AK
DOI: --
发表时间: 1988-11
期刊: The Journal of biological chemistry
影响因子: --
作者:
M. Denison;J. Fisher;J. Whitlock
通讯作者: M. Denison;J. Fisher;J. Whitlock