Retinoids increase human apolipoprotein A-11 expression through activation of the retinoid X receptor but not the retinoic acid receptor

Retinoids increase human apolipoprotein A-11 expression through activation of the retinoid X receptor but not the retinoic acid receptor
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类视黄醇通过激活类视黄醇 X 受体而非视黄酸受体来增加人载脂蛋白 A-11 表达

DOI:
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发表时间:
1996
影响因子:
5.3
通讯作者:
J. Auwerx
J. Auwerx
中科院分区:
生物学2区
文献类型:
--
作者:
N. Vu;K. Schoonjans;Vladimir Kosykh;Jean Dallongeville;Richard A. Heyman;Bart Staels;J. Auwerx

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考虑到血浆高密度脂蛋白 (HDL) 胆固醇水平与冠状动脉疾病的保护作用之间的联系,以及类视黄醇对主要 HDL 载脂蛋白 (apo)、apo A-I 产生的有益作用,本研究的目的是分析类视黄醇对另一种主要 HDL 蛋白 apo A-II 表达的影响。视黄酸 (RA) 衍生物对肝脏 apo A-II 的产生有直接影响,因为全反式 (at) RA 可诱导人肝细胞原代培养物中 apo A-II mRNA 水平和 apo A-II 分泌。在 HepG2 人肝母细胞瘤细胞系中,at-RA 和 9-cis RA 以及类视黄醇 X 受体 (RXR) 特异性激动剂 LGD 1069,但不包括 RA 受体 (RAR) 激动剂 乙基-p-[(E)-2-(5,6,7,8-四氢-5,5,8,8-四甲基-2-萘基)-l-pro Penyl]-苯甲酸 (TTNPB),诱导 apo A-II mRNA 水平。使用由人 apo A-II 基因启动子驱动的报告构建体进行的瞬时转染实验表明,9-cis RA 和 at-RA 以及 RXR 激动剂 LGD 1069 和 LG 100268 在转录水平诱导 apo A-II 基因表达。仅观察到 RAR 激动剂 TTNPB 对 apo A-II 启动子报告构建体的最小影响。单侧缺失和定点诱变鉴定出介导 RA 反应性的 apo A-II 启动子的 J 位点。该元件包含两个不完美的半位点,间隔 1 个寡核苷酸。与 RXR 或 RAR 激动剂结合使用的共转染测定表明,RXR 而不是 RAR 通过该元件反式激活 apo A-II 启动子。相比之下,RAR 以剂量依赖性方式抑制 RXR 对 apo A-II J 位点的诱导作用。凝胶阻滞测定表明,RXR 同二聚体与 AH-RXR 响应元件结合,尽管亲和力低于 RAR-RXR 异二聚体。总之,类视黄醇通过 RXR 与 J 位点中包含两个不完美半位点(间隔 1 个寡核苷酸)的元件相互作用,在转录水平诱导肝脏 apo A-II 的产生,从而证明 RXR 在控制人脂蛋白代谢中的重要作用。由于 J 位点还通过激活过氧化物酶体增殖物激活受体 RXR 异二聚体赋予 apo A-II 基因对贝特类和脂肪酸的反应性,因此该位点可被认为是多代谢反应元件。
Considering the link between plasma high-density lipoprotein (HDL) cholesterol levels and a protective effect against coronary artery disease as well as the suggested beneficial effects of retinoids on the production of the major HDL apolipoprotein (apo), apo A-I, the goal of this study was to analyze the influence of retinoids on the expression of apo A-II, the other major HDL protein. Retinoic acid (RA) derivatives have a direct effect on hepatic apo A-II production, since all-trans (at) RA induces apo A-II mRNA levels and apo A-II secretion in primary cultures of human hepatocytes. In the HepG2 human hepatoblastoma cell line, both at-RA and 9-cis RA as well as the retinoid X receptor (RXR)-specific agonist LGD 1069, but not the RA receptor (RAR) agonist ethyl-p-[(E)-2-(5,6,7,8-tetrahydro-5,5,8,8-tetramethyl-2-naphthyl)-l-pro penyl]-benzoic acid (TTNPB), induce apo A-II mRNA levels. Transient-transfection experiments with a reporter construct driven by the human apo A-II gene promoter indicated that 9-cis RA and at-RA, as well as the RXR agonists LGD 1069 and LG 100268, induced apo A-II gene expression at the transcriptional level. Only minimal effects of the RAR agonist TTNPB were observed on the apo A-II promoter reporter construct. Unilateral deletions and site-directed mutagenesis identified the J site of the apo A-II promoter mediating the responsiveness to RA. This element contains two imperfect half-sites spaced by 1 oligonucleotide. Cotransfection assays in combination with the use of RXR or RAR agonists showed that RXR but not RAR transactivates the apo A-II promoter through this element. By contrast, RAR inhibits the inductive effects of RXR on the apo A-II J site in a dose-dependent fashion. Gel retardation assays demonstrated that RXR homodimers bind, although with a lower affinity than RAR-RXR heterodimers, to the AH-RXR response element. In conclusion, retinoids induce hepatic apo A-II production at the transcriptional level via the interaction of RXR with an element in the J site containing two imperfect half-sites spaced by 1 oligonucleotide, thereby demonstrating an important role of RXR in controlling human lipoprotein metabolism. Since the J site also confers responsiveness of the apo A-II gene to fibrates and fatty acids via the activation of peroxisome proliferator-activated receptor-RXR heterodimers, this site can be considered a plurimetabolic response element.
DOI: 10.1016/s0021-9258(19)49613-0
发表时间: 1992-08
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影响因子: --
作者:
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DOI: 10.1021/bi00206a017
发表时间: 1994
期刊: Biochemistry
影响因子: 2.9
作者:
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通讯作者: Chambaz,J
DOI: 10.1126/science.8332912
发表时间: 1993-07-23
期刊: SCIENCE
影响因子: 56.9
作者:
WARDEN, CH;HEDRICK, CC;LUSIS, AJ
通讯作者: LUSIS, AJ
影响载脂蛋白 A-II 翻译效率的多态性决定了高密度脂蛋白的大小和组成。
DOI: --
发表时间: 1990
期刊: The Journal of biological chemistry
影响因子: --
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DOI: --
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影响因子: --
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