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基于 Nrf2/HO-1 信号通路的夜关门提取物对谷氨酸诱导小鼠海

        马细胞HT22损伤的保护作用及机制研究                                            Δ


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                                2 #
              1*
        郭 丰 ,黄 山 ,李 斌 (1.白城医学高等专科学校药学系,吉林 白城 137000;2.青岛科技大学药学系,山
        东 青岛 266000)
        中图分类号 R285          文献标志码 A          文章编号 1001-0408(2020)11-1303-06
        DOI  10.6039/j.issn.1001-0408.2020.11.04

        摘  要   目的:基于核因子2(Nrf2)/血红素加氧酶1(HO-1)信号通路研究夜关门提取物对谷氨酸诱导小鼠海马细胞HT22损伤的
        保护作用及机制。方法:采用谷氨酸(5 mmol/L)建立 HT22 细胞损伤模型后,以水溶性维生素 E 为阳性对照(50 µmol/L),采用
        MTT法检测0(空白对照)、25、50、100 µg/mL夜关门的石油醚、二氯甲烷、乙酸乙酯提取物预处理12 h后对谷氨酸诱导损伤细胞增
        殖的影响。以水溶性维生素E为阳性对照(50 µmol/L),采用2′,7′-二氯荧光黄双乙酸盐探针(DCFH-DA)法检测0(空白对照)、
        25、50、100 µg/mL夜关门二氯甲烷提取物预处理12 h后对谷氨酸诱导损伤细胞中活性氧(ROS)水平的影响;以HO-1激动剂钴-原
        卟啉为阳性对照,采用Western blotting法检测0(空白对照)、25、50、100 µg/mL夜关门二氯甲烷提取物处理24 h后对细胞中HO-1
        蛋白表达的影响;分别采用Western blotting法(药物分别处理0.5、1、1.5 h)和免疫荧光染色法(药物处理1 h)检测100 µg/mL夜关
        门二氯甲烷提取物处理后对细胞核内外Nrf2蛋白表达的影响。采用小干扰RNA(si-RNA)转染技术进行HO-1基因沉默后,考察
        100 µg/mL夜关门二氯甲烷提取物对谷氨酸诱导损伤细胞的存活率以及细胞中ROS水平的影响。结果:与空白对照比较,50、100
        µg/mL夜关门二氯甲烷提取物均可显著升高细胞的存活率(P<0.05),并降低细胞中ROS水平(P<0.05);25、50、100 µg/mL夜关
        门二氯甲烷提取物均可显著升高细胞中HO-1蛋白表达水平(P<0.05),100 µg/mL夜关门二氯甲烷提取物可显著降低细胞质中
        Nrf2蛋白水平并升高细胞核中Nrf2蛋白水平(P<0.05)。HO-1基因沉默后,夜关门二氯甲烷提取物对谷氨酸诱导损伤细胞的促
        增殖以及降低ROS水平的作用被逆转(P<0.05)。结论:夜关门二氯甲烷提取物可通过激活Nrf2信号通路,诱导HO-1蛋白的表
        达,从而发挥对谷氨酸诱导损伤HT22细胞的保护作用。
        关键词 夜关门;谷氨酸;血红素加氧酶 1;核因子2;小鼠;海马细胞HT22;机制

        Study on Protective Effects and Mechanism of Lespedeza cuneata Extracts on        Glutamate-induced
        Hippocampal Cells HT22 Injury of Mice Based on Nrf2/HO-1 Signaling Pathway
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                 1
        GUO Feng ,HUANG Shan ,LI Bin(1.Dept. of Pharmacy,Baicheng Medical College,Jilin Baicheng 137000,
                                2
        China;2.Dept. of Pharmacy,Qingdao University of Science and Technology,Shandong Qingdao 266000,China)
        ABSTRACT    OBJECTIVE:To study the protective effects of Lespedeza cuneata extract on glutamate-induced hippocampal cells
        HT22 injury of mice and its possible mechanism based on Nrf2/HO-1 signaling pathway. METHODS:Using glutamate(5 mmol/L)
        to extablish the injury model of HT22 cells. Using water soluble vitamin E as positive control(50 µmol/L),MTT assay was used
        to detect the effects of 0(blank control),25,50,100 µg/mL petroleum ether extract,dichloromethane extract,ethyl acetate
        extract of L. cuneata on the proliferation of glutamate-induced injury cellsafter pretreated for 12 h. Using water soluble vitamin E as
        positive control(50 µmol/L),DCFH-DA assay was used to detect the effects of 0(blank control),25,50,100 µg/mL L. cuneata
        dichloromethane extract on the level of active oxygen(ROS)in glutamate-induced injury cells after pretreated with 12 h. Using
        HO-1 agonist CoPP as positive control,Western blotting method was used to detect the effects of 0(blank control),25,50,100
        µg/mL L. cuneata dichloromethane extract on the protein expression of HO-1 after treated for 24 h. Western blotting method
       (treated for 0.5,1,1.5 h)and immunofluorescence staining(treated for 1 h)were used to detect the effects of 100 µg/mL L.
        cuneata dichloromethane extract on protein expression of Nrf2 inside and outside the nucleus. After HO-1 gene was silenced by
        small interfering RNA(Si RNA) transfection technology,the effects of 100 µg/mL L. cuneata dichloromethane extract on the
        survival rates of glutamate-induced injury cells and the level of ROS were detected. RESULTS:Compared with blank control,50,
        100 µg/mL L. cuneata dichloromethane extract could significantly improve the survival rate of glutamate-induced injury cells(P<
                                                            0.05),while reduced the level of ROS (P<0.05). 25,50,
            Δ 基 金 项 目 :国 家 自 然 科 学 基 金 资 助 项 目(No.81760779,
                                                            100 µg/mL L. cuneata dichloromethane extract could increase
        No.31500288,No.81360686)
                                                            the protein expression of HO-1 in cells(P<0.05),while 100
           *讲师,硕士。研究方向:天然药物化学。E-mail:gfeng006@163.
                                                            µg/mL L. cuneata dichloromethane extract could significantly
        com
           # 通信作者:讲师,硕士生导师,博士。研究方向:中药与民族药                   decrease the protein level of Nrf2 in cytoplasm and increase
        药理学。E-mail:leebin09@qust.edu.cn                     that in nucleus (P<0.05). After HO-1 gene silencing,the


        中国药房    2020年第31卷第11期                                             China Pharmacy 2020 Vol. 31 No. 11  ·1303  ·
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