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首页> 外文期刊>Bioelectromagnetics. >Pulsed electric field exposure of insulin induces anti-proliferative effects on human hepatocytes.
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Pulsed electric field exposure of insulin induces anti-proliferative effects on human hepatocytes.

机译:胰岛素的脉冲电场暴露诱导对人肝细胞的抗增殖作用。

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The purpose of this study was to examine the effects and the mechanism of a pulsed electric field (PEF) on insulin and its subsequent mediation of proliferative changes in human hepatocytes in vitro. The PEF, the electric field intensity coupled into the culture medium, was about 0.7 V/m with a repeating frequency of 50 Hz. Insulin solution was exposed to PEF for 20 min and added to the culture medium of human hepatocytes. Combining fluorescence spectroscopy, immunocytochemistry, microarrays, RT-PCR and MTT, several important events of the insulin signaling pathways were investigated, including ligand-receptor binding capacity, intracellular tyrosine phosphorylation level, gene transcription, and cell proliferation. PEF produced a conformational change of insulin molecule. The binding capacity of insulin to its receptors was reduced to 87% of the control level after PEF treatment, and the average intracellular tyrosine phosphorylation level decreased by 11%. The expression of 55 of 12,000 genes examined was modified, including an increase in the expression of human tyrosine phosphatase and the small GTP-binding protein. Based on these results, a mechanism is proposed to explain the bio-effects of PEF on hepatic cell proliferation through the insulin signaling pathway.
机译:这项研究的目的是检查脉冲电场(PEF)对胰岛素的影响及其机理,以及其在体外对人肝细胞增殖变化的介导作用。 PEF(耦合到培养基中的电场强度)约为0.7 V / m,重复频率为50 Hz。将胰岛素溶液暴露于PEF 20分钟,然后添加到人肝细胞的培养基中。结合荧光光谱,免疫细胞化学,微阵列,RT-PCR和MTT,研究了胰岛素信号通路的几个重要事件,包括配体-受体结合能力,细胞内酪氨酸磷酸化水平,基因转录和细胞增殖。 PEF产生了胰岛素分子的构象变化。 PEF处理后,胰岛素与其受体的结合能力降低至对照水平的87%,平均细胞内酪氨酸磷酸化水平降低11%。修改了检查的12,000个基因中的55个的表达,包括增加了人酪氨酸磷酸酶和小的GTP结合蛋白的表达。基于这些结果,提出了一种机制来解释PEF通过胰岛素信号通路对肝细胞增殖的生物学影响。

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