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| 1 | 黄芪黄酮对糖尿病周围神经病变大鼠背根神经节的保护作用及机制显示文摘目的探讨黄芪黄酮对糖尿病周围神经病变大鼠背根神经节氧化应激及细胞凋亡的影响及机制。方法将40只雄性SD大鼠随机分为正常对照组、模型组、黄芪黄酮组和阳性对照组,每组10只。模型组、黄芪黄酮组和阳性对照组腹腔注射2%的链脲佐菌素制备糖尿病周围神经病变大鼠模型,正常对照组腹腔注射等量枸橼酸盐缓冲液。造模成功后,分别给予黄芪黄酮组、阳性对照组大鼠灌胃黄芪黄酮、金芪降糖片,给予其他两组灌胃等量蒸馏水。造模30 d时,采用血糖仪及Von Frey仪分别测量各组大鼠血糖及机械痛阈值。取各组大鼠的背根神经节组织,检测细胞凋亡率、膜电位水平,并测定背根神经节组织的活性氧簇(ROS)、超氧化物歧化酶(SOD)、丙二醛含量以及细胞色素C(Cyt-C)、B细胞淋巴瘤-2(Bcl-2)、B细胞淋巴瘤-2相关X蛋白(Bax)和活化的含半胱氨酸的天冬氨酸蛋白水解酶3(cleaved Caspase3)、p38和磷酸化p38(p-p38)的蛋白表达水平。结果 (1)造模30 d时,与正常对照组比较,模型组大鼠的血糖水平、背根神经节细胞凋亡率升高,背根神经节组织的ROS和丙二醛含量以及Cyt-C、Bax、cleaved Caspase3、p38、p-p38蛋白表达水平均增加,而机械痛阈值及背根神经节组织的膜电位水平、SOD含量、Bcl-2蛋白表达水平均降低(均P<0.05)。(2)造模30 d时,与模型组比较,黄芪黄酮组和阳性对照组大鼠的血糖水平、背根神经节细胞凋亡率均降低,背根神经节组织的ROS和丙二醛含量以及Cyt-C、Bax、cleaved Caspase3、p38、p-p38蛋白表达水平均下降,机械痛阈值及背根神经节组织的膜电位水平、SOD含量、Bcl-2蛋白表达水平均升高(均P<0.05);且与阳性对照相比,黄芪黄酮组背根神经节细胞凋亡率下降,背根神经节组织的ROS和丙二醛含量以及Cyt-C、Bax、p38、p-p38蛋白表达水平均降低,机械痛阈值、背根神经节组织的膜电位水平、SOD含量均升高(均P<0.05)。结论黄芪黄酮可抑制糖尿病大鼠背根神经节组织氧化应激反应、细胞凋亡以及p38丝裂原活化蛋白激酶信号通路,从而减轻周围神经损伤。 | 侯君 成玥 李佳识 魏莱 吴强鹏 刘朝仁 侯芳 | 2021 | 广西医学2021，43，22： | 6 |
| 2 | Activation of p38/HSP27 pathway counters melatonin-induced inhibitory effect on proliferation of human gastric cancer cells显示文摘Overexpression of heat shock protein 27(HSP27)in gastric cancer is correlated with poor clinical prognosis.Melatonin,an endogenous hormone,shows promise in gastric cancer therapy.However,there is limited study on the biological activity of HSP27 in response to melatonin treatment.In this study,we show an anti-proliferative action of melatonin on human gastric cancer cell lines BGC-823 and MGC-803.Biochemically,the inhibitory effect of melatonin is accompanied by the upregulation of HSP27 phosphorylation level.Transfection of gastric cancer cells with HSP27-specific siRNA effectively reduces HSP27 phosphorylation and potentiated melatonininduced inhibitory effect on cell proliferation.The reduction of cyclin D1 in melatonin-treated cells is also aggravated by HSP27 depletion.Moreover,melatonin stimulation increases p38 phosphorylation.Pretreatment with p38 inhibitor SB203580 not only remarkably suppresses melatonin-induced HSP27 phosphorylation,but also augment the inhibitory effect of melatonin on cyclin D1 expression as well as cell proliferation.Taken together,our study indicates the protective pathway of p38/HSP27 against melatonin-induced inhibitory effect on gastric cancer cell proliferation,suggesting that combined with p38/HSP27 pathway inhibitor,the therapeutic efficacy of melatonin on gastric cancer may be improved. | Chenchen Zhu Haonan Jiang Wenjie Deng Shuo Zhao Kaiquan Li Yuting Wang Qinjun Wei Jun Du | 2019 | The Journal of Biomedical Research2019，33，5： | 0 |
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