上海交通大学学报(医学版)

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熊果酸对血管紧张素Ⅱ诱导肝星状细胞内NADPH氧化酶的活化及下游信号通路的影响

陈 涛,何文华,朱 萱,黄 雯,余珊珊,陈 标,黄德强   

  1. 南昌大学第一附属医院消化内科, 南昌 330006
  • 出版日期:2015-01-28 发布日期:2015-01-29
  • 通讯作者: 朱 萱, 电子信箱: jyyfyzx@163.com。
  • 作者简介:陈 涛(1987—), 男, 硕士生; 电子信箱: jyyfyct@sina.com。
  • 基金资助:

    国家自然科学基金(81160061, 81260082)

Effects of ursolic acid on activation of NADPH oxidase and downstream signaling pathways of hepatic stellate cells induced by angiotensinⅡ

CHEN Tao, HE Wen-hua, ZHU Xuan, HUANG Wen, YU Shan-shan, CHEN Biao, HUANG De-qiang   

  1. Department of Gastroenterology, the First Affiliated Hospital of Nanchang University, Nanchang 330006, China
  • Online:2015-01-28 Published:2015-01-29
  • Supported by:

    National Natural Science Foundation of China, 81160061, 81260082

摘要:

目的 分析熊果酸(UA)对血管紧张素Ⅱ(AngⅡ)引起肝星状细胞(HSC)NADPH氧化酶(NOX)激活及其下游的PI3K/Akt、P38MAPK信号通路的影响。方法 将培养激活的HSC-T6细胞株分组:对照组,不加任何药物;AngⅡ组,给予AngⅡ(1 μmol/L) 刺激细胞;各干预组分别给予UA(50 μmol/L)、NOX抑制剂DPI (20 μmol/L)、PI3K/Akt信号通路抑制剂LY294002 (10 μmol/L)、P38MAPK信号通路抑制剂SB203580 (10 μmol/L)预处理30 min,再加入AngⅡ处理不同时间。通过Western blotting检测细胞膜上NOX亚基p47Phox蛋白、细胞总PI3K蛋白和磷酸化的Akt、P38MAPK蛋白的表达;采用RT-PCR法检测UA对AngⅡ诱导的Ⅰ型胶原表达,CCK-8比色法检测HSC-T6的增殖率。结果 用AngⅡ处理15 min后,细胞膜上p47phox蛋白的表达明显高于对照组(P<0.05);分别给予UA及DPI进行干预后,细胞膜上p47phox蛋白的表达较AngⅡ组明显降低(P<0.05)。用AngⅡ处理30 min后,PI3K、p-Akt的蛋白表达明显高于对照组(P<0.05);而分别给予UA、LY294002、DPI进行干预后,PI3K、p-Akt蛋白的表达较AngⅡ组均降低(P<0.05)。用AngⅡ处理30 min后,p-P38MAPK蛋白表达明显高于对照组(P<0.05);分别给予UA、SB203580、DPI干
预后,p-P38MAPK蛋白的表达较AngⅡ组明显降低(P<0.05)。AngⅡ处理12 h后,Ⅰ型胶原的mRNA的表达明显高于对照组(P<0.05);分别给予UA、DPI、SB203580、LY294002干预后,Ⅰ型胶原的mRNA表达较AngⅡ组均明显降低(P<0.05)。AngⅡ刺激12、24、48 h后,细胞增殖率明显升高;分别给予UA、DPI、SB203580、LY294002干预后,细胞增殖率均低于AngⅡ组(P<0.05)。结论 UA能够通过抑制NOX活化阻断AngⅡ在肝星状细胞内的信号转导,从而抑制肝星状细胞的增殖及Ⅰ型胶原基因的表达。

关键词: 肝星状细胞, 血管紧张素Ⅱ, 熊果酸, NADPH氧化酶, 信号通路

Abstract:

Objective To analyze the effects of ursolic acid (UA) on the activation of NADPH oxidase (NOX) and the downstream signaling pathways of PI3K/Akt and P38MAPK of hepatic stellate cells (HSC) induced by angiotensinⅡ(AngⅡ). Methods Culture-activated HSC-T6 cells were divided into the control group (received no medicines), AngⅡ group (received AngⅡ of 1 μmol/L), and 4 intervention groups, which were pretreated with UA of 50 μmol/L, NOX inhibitor DPI of 20 μmol/L, PI3K/Akt inhibitor LY294002 of 10 μmol/L, and P38MAPK inhibitor SB203580 of 10 μmol/L for 30 min and then treated with AngⅡ for different periods of time. Expressions of NOX subunit p47phox, total PI3K, phosphorylated p-Akt, and p-P38MAPK of the membrane were detected by the Western blotting. Collagen Ⅰ mRNA expressions induced by AngⅡ were detected by the RT-PCR and the proliferation rate of HSC-T6 was measured by the CCK-8. Results After being treated with AngⅡ for 15 min, the expression of p47phox of membrane was significantly higher than that of the control group (P<0.05). After being intervened by DPI and UA, the expression of p47phox of membrane was significantly lower than that of the AngⅡ group (P<0.05). After being treated with AngⅡ for 30 min, the expressions of PI3K and p-Akt were significantly higher than those of the control group (P<0.05). After being intervened by UA, DPI, and LY294002, the expressions of PI3K and p-Akt were lower than those of the AngⅡ group (P<0.05). After being treated with AngⅡ for 30 min, the expression of p-P38MAPK was significantly higher than that of the control group (P<0.05).After being intervened by SB203580, UA, and DPI, the expression of p-P38MAPK was significantly lower than that of the AngⅡ group (P<0.05). After being treated with AngⅡ for 12 h, the mRNA expression of collagenⅠ was significantly higher than that of the control group (P<0.05). After being intervened by SB203580, LY294002, UA, and DPI, the mRNA expression of collagenⅠ was significantly lower than that of the AngⅡ group (P<0.05). After being treated with AngⅡ for 12, 24, and 48 h, the proliferation rate of HSC-T6 significantly increased. After being intervened by LY294002, SB203580, UA, and DPI, the proliferation rate HSC-T6 was lower than that of the AngⅡ group (P<0.05). Conclusion UA can block the signal transduction of AngⅡ in HSC by inhibiting the activation of NOX subunit p47phox, therefore inhibit the proliferation of HSC and the mRNA expression of CollagenⅠ.

Key words: hepatic stellate cell, AngⅡ, ursolic acid, NADPH oxidase, signaling pathway