The apolipoprotein B gene is constitutively expressed in HepG2 cells: regulation of secretion by oleic acid, albumin, and insulin, and measurement of the mRNA half-life.

The apolipoprotein B gene is constitutively expressed in HepG2 cells: regulation of secretion by oleic acid, albumin, and insulin, and measurement of the mRNA half-life.
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载脂蛋白 B 基因在 HepG2 细胞中组成型表达:通过油酸、白蛋白和胰岛素调节分泌,并测量 mRNA 半衰期。

DOI:
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发表时间:
1989
影响因子:
6.5
通讯作者:
James Scott
James Scott
中科院分区:
生物学2区
文献类型:
--
作者:
C. Pullinger;Julia D. North;B. Teng;Vincent A. Rifici;A. E. R. de;Brito;James Scott

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本研究的目的是建立HepG2细胞分泌apoB可在大范围内调节的条件,并确定其输出量的变化是否与apoB mRNA水平相关。油酸(以1.7:1的摩尔比与3%白蛋白配合)的存在导致载脂蛋白ob分泌的3.5倍刺激,仅在3小时后就能明显地看到。胰岛素使载脂蛋白ob的输出率减半,在生理胰岛素范围内可以检测到抑制作用,但直到12-16小时才明显。培养基中的白蛋白对载脂蛋白ob的产生具有剂量依赖性抑制作用。总体而言,HepG2细胞的apoB分泌被调节在7倍范围内。然而,当通过槽型杂交检测载脂蛋白mRNA时,在任何调节载脂蛋白输出的条件下都没有检测到任何变化。定量溶液杂交证实油酸不影响apoB mRNA水平。对[3H]尿苷标记的载脂蛋白mRNA衰变的动力学分析表明,载脂蛋白mRNA的半衰期为16小时。我们从这些研究中得出结论,载脂蛋白基因在HepG2细胞中组成性表达,这些细胞对载脂蛋白产生的急性调节机制必须涉及共翻译过程或翻译后过程。
The objective of this study was to establish conditions whereby apoB secreted from HepG2 cells could be regulated over a wide range, and to determine whether changes of output were correlated with the level of apoB mRNA. The presence of oleate (complexed to 3% albumin at a molar ratio of 1.7:1) resulted in a 3.5-fold stimulation of apoB secretion that was apparent after only 3 h. Insulin halved the rate of apoB output and the inhibition was detectable within the physiological insulin range, but was not apparent until 12-16 h. Albumin in the culture medium had a dose-dependent inhibitory effect on apoB production. Overall, apoB secretion from HepG2 cells was modulated over a 7-fold range. However, when apoB mRNA was assayed by slot-blot hybridization, no change was detectable under any of the conditions that modulated apoB output. Quantitative solution hybridization was used to confirm that oleate did not affect the level of apoB mRNA. Kinetic analysis of the decay of [3H]uridine-labeled apoB mRNA showed that the half-life of apoB mRNA was 16 h. We conclude from these studies that the apoB gene is constitutively expressed in HepG2 cells and that the mechanism of acute regulation of apoB production by these cells must involve co- or post-translational processes.
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