虾青素保护PC-3细胞免受HO氧化应激的作用机制

被引：7

作者：

倪晓锋 ^{[1
]}

于海宁 ^{[2
]}

王姗姗 ^{[1
]}

张程程 ^{[1
]}

沈生荣 ^{[1
]}

机构：

[1] 浙江大学生物系统工程与食品科学学院

[2] 浙江工业大学药学院

来源：

食品科学 | 2018年 / 09期

关键词：

虾青素; 氧化应激; PC-3细胞; 丝裂原活化蛋白激酶途径; 核因子E2相关基因2; 血红素氧合酶1;

D O I：

暂无

中图分类号：

R151 [营养学];

学科分类号：

100403 [营养与食品卫生学];

摘要：

目的:研究虾青素对过氧化氢诱导PC-3细胞氧化应激的保护作用,探索其信号通路机制。方法:建立H2O2氧化应激模型,采用不同浓度虾青素预处理PC-3细胞,检测细胞存活率、细胞凋亡、活性氧(reactive oxygen species,ROS)水平、B淋巴细胞瘤-2(B-cell lymphoma-2,Bcl-2)、Bcl-2相关X蛋白(Bcl-2-associated X protein,Bax)、活化半胱天冬酶-3表达及丝裂原活化蛋白激酶-核因子E2相关基因2-血红素氧合酶1(mitogen-activated protein kinases nuclear factor erythroid-2-related factor 2-heme oxygenase 1,MAPK-Nrf2-HO-1)通路的变化。结果:20μmol/L虾青素预处理显著提高H2O2所降低的细胞存活率、降低ROS水平(P<0.05),同时通过抑制Bcl-2/Bax比率下降及半胱天冬酶-3的激活,从而使细胞凋亡率从51.4%降低至14.8%,进一步研究发现虾青素能够促进Nrf2磷酸化,并促进HO-1的表达,呈现浓度依赖性。通过细胞外调节蛋白激酶(extracellular regulated protein kinases,ERK)抑制剂(U0126)和Akt抑制剂(LY294002)预处理,发现当ERK和磷脂酰肌醇激酶/蛋白激酶B(phosphoinositide 3-kinase/protein kinase B,PI3K/Akt)通路被抑制后,Nrf2表达降低,表明HO-1上调受上游ERK和胞内PI3K/Akt通路的调控。在对MAPK途径对细胞毒性影响的研究中,ERK通路被抑制后细胞存活率显著下降,而c-Jun氨基末端激酶(c-Jun N-terminal kinase,JNK)和p38 MAPK通路被抑制后并不影响其保护作用,表明虾青素抑制细胞存活率下降是通过MAPK途径中的ERK通路,而不是JNK和p38通路。结论:虾青素预处理PC-3细胞可以减轻H2O2诱导的氧化应激,维持细胞生理活性。

引用

页码：154 / 162

页数：9

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