Suppression of the protein tyrosine phosphatase LAR reduces apolipoprotein B secretion by McA-RH7777 rat hepatoma cells.

Suppression of the protein tyrosine phosphatase LAR reduces apolipoprotein B secretion by McA-RH7777 rat hepatoma cells.
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抑制蛋白酪氨酸磷酸酶 LAR 可减少 McA-RH7777 大鼠肝癌细胞的载脂蛋白 B 分泌。

DOI:
10.1006/bbrc.1997.7142
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发表时间:
1997
影响因子:
3.1
通讯作者:
Sparks,JD
Sparks,JD
中科院分区:
生物学4区
文献类型:
--
作者:
Phung,TL;Mooney,RA;Kulas,DT;Sparks,CE;Sparks,JD

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胰岛素可减少大鼠肝细胞中载脂蛋白 B (apo B) 的分泌。为了评估胰岛素作用导致抑制 apo B 分泌的可能机制,我们评估了抑制蛋白酪氨酸磷酸酶 LAR 对 McA-RH7777 (McA) 大鼠肝癌细胞的 apo B 分泌的影响。通过用 LAR 反义 cDNA 稳定转染 McA 细胞来降低细胞 LAR 水平。先前的研究表明,LAR 反义转染子表现出胰岛素受体信号传导增强。在目前的研究中,与空载体对照相比,LAR 表达减少导致 apo B 分泌减少 60% 至 70%。 apo B 分泌的减少与细胞 apo B mRNA 水平的显着降低相关。结果表明 McA 细胞中蛋白质酪氨酸磷酸化与 apo B mRNA 丰度的调节存在关系。
Apolipoprotein B (apo B) secretion is reduced by insulin in rat hepatocytes. To evaluate possible mechanisms by which insulin action leads to inhibition of apo B secretion, we evaluated the effect of suppression of the protein-tyrosine phosphatase LAR on apo B secretion by McA-RH7777 (McA) rat hepatoma cells. A reduction in cellular LAR levels was accomplished by stable transfection of McA cells with LAR antisense cDNA. Previous studies indicate that LAR-antisense transfectants demonstrate increased insulin receptor signaling. In current studies, reduced LAR expression results in a 60% to 70% reduction in apo B secretion compared with null vector control. The reduction in apo B secretion correlated with a significant decrease in cellular apo B mRNA levels. Results suggests there is a relationship of protein tyrosine phosphorylation with regulation of apo B mRNA abundance in McA cells.
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