Reactive oxygen species alter autocrine and paracrine signaling.

Reactive oxygen species alter autocrine and paracrine signaling.
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活性氧会改变自分泌和旁分泌信号。

DOI:
10.1016/j.freeradbiomed.2011.09.001
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发表时间:
2011
影响因子:
7.4
通讯作者:
Karin,NormanJ
Karin,NormanJ
中科院分区:
医学1区
文献类型:
--
作者:
Zangar,RichardC;Bollinger,Nikki;Weber,ThomasJ;Tan,RuiminM;Markillie,LMeng;Karin,NormanJ

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细胞色素 P450 (P450) 3A4 (CYP3A4) 是人类肝脏和肠道中最丰富的 P450 蛋白,可由多种药物和其他化合物高度诱导。已知 P450 催化循环可解偶联并释放活性氧 (ROS),但从对细胞生物学影响的角度来看,P450 和内质网中其他酶产生的 ROS 的影响还很少研究。在这项研究中,我们在 HepG2 细胞(一种人肝癌细胞系)中表达低水平的 CYP3A4,并检查了其对细胞内 ROS 水平以及对细胞外通讯中重要的各种生长因子的分泌的影响。使用氧化还原敏感染料 RedoxSensor red,我们证明 CYP3A4 的表达会增加活细胞中 ROS 的水平。采用定制 ELISA 微阵列平台证明 CYP3A4 的表达增加双调蛋白、细胞内粘附分子 1、基质金属蛋白酶 2、血小板源性生长因子 (PDGF) 和血管内皮生长因子的分泌,但抑制 CD14 的分泌。抗氧化剂 N-乙酰半胱氨酸抑制除 CD14 之外的所有 P450 依赖性蛋白质分泌变化。定量 RT-PCR 证明蛋白质分泌的变化与基因表达的相应变化一致相关。抑制 NF-κB 通路可阻断 P450 对 PDGF 分泌的影响。 CYP3A4 表达还改变了人乳腺上皮细胞和 C10 小鼠肺细胞的蛋白质分泌。总的来说,这些结果表明内质网中ROS产生的增加改变了在旁分泌和自分泌信号传导中起关键作用的蛋白质的分泌。
Cytochrome P450 (P450) 3A4 (CYP3A4) is the most abundant P450 protein in human liver and intestine and is highly inducible by a variety of drugs and other compounds. The P450 catalytic cycle is known to uncouple and release reactive oxygen species (ROS), but the effects of ROS from P450 and other enzymes in the endoplasmic reticulum have been poorly studied from the perspective of effects on cell biology. In this study, we expressed low levels of CYP3A4 in HepG2 cells, a human hepatocarcinoma cell line, and examined effects on intracellular levels of ROS and on the secretion of a variety of growth factors that are important in extracellular communication. Using the redox-sensitive dye RedoxSensor red, we demonstrate that CYP3A4 expression increases levels of ROS in viable cells. A custom ELISA microarray platform was employed to demonstrate that expression of CYP3A4 increased secretion of amphiregulin, intracellular adhesion molecule 1, matrix metalloprotease 2, platelet-derived growth factor (PDGF), and vascular endothelial growth factor, but suppressed secretion of CD14. The antioxidant N-acetylcysteine suppressed all P450-dependent changes in protein secretion except for CD14. Quantitative RT-PCR demonstrated that changes in protein secretion were consistently associated with corresponding changes in gene expression. Inhibition of the NF-κB pathway blocked P450 effects on PDGF secretion. CYP3A4 expression also altered protein secretion in human mammary epithelial cells and C10 mouse lung cells. Overall, these results suggest that increased ROS production in the endoplasmic reticulum alters the secretion of proteins that have key roles in paracrine and autocrine signaling.
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发表时间: 1984-06
期刊: The Journal of biological chemistry
影响因子: --
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发表时间: 2003
期刊: Biochemistry.
影响因子: --
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