目的进一步明确熊果酸(ursolic acid,UA)抑制胃癌细胞环氧化酶-2(cycloxygenase-2,COX-2)表达的信号转导通路。方法人胃腺癌细胞株SGC-7901和MKN-45常规培养于RPMI-1640培养液中,细胞长至亚单层后分别加抗氧化剂N-乙酰-L半胱氨酸(NAC)、单磷酸腺苷激活的蛋白激酶(AMP-activated protein kinase,AMPK)激活剂5-氨基咪唑-4-甲酰胺核苷酸(AICAR)、AMPK抑制剂compound C和信号转导与转录活化因子3(signal transducer and activator of transcription 3,STAT3)抑制剂WP1066预处理后再加UA连续培养24 h,Western blot检测AMPK、STAT3磷酸化水平和COX-2蛋白表达。结果抗氧化剂NAC和AMPK抑制剂compound C有效地阻断了UA抑制STAT3磷酸化和COX-2表达的作用,AMPK激活剂AICAR抑制STAT3磷酸化和COX-2表达,AICAR和UA联合作用大于单用,STAT3抑制剂WP1066对UA诱导的AMPK磷酸化无明显影响,W...
【英文摘要】
Aim Our previous study has found that ursolic acid( UA) increased intracellular reactive oxygen species( ROS) production and adenosine monophosphate-activated protein kinase( AMPK) phosphorylation,inhibited signal transducer and activator of transcription 3( STAT3) phosphorylation and cyclooxygenase-2( COX-2) expression in gastric cancer cells.However,the molecular mechanism by which UA inhibits COX-2 expression in gastric cancer cells has not been fully clarified. In this study we aimed to further clarify ...
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