The effect of thyrosine kinase, calmodulin and voltage-dependent Ca 2+ channel on the proliferation of hepatoma cells induced by EGF was studied. Hepatoma cell line SMMC7721 was cultured in RPMI1640 serum-free me...The effect of thyrosine kinase, calmodulin and voltage-dependent Ca 2+ channel on the proliferation of hepatoma cells induced by EGF was studied. Hepatoma cell line SMMC7721 was cultured in RPMI1640 serum-free medium. DNA synthesis rate of hepatoma cells was measured by 3H-TdR incorporation. 10 -9 mol/L EGF could significantly stimulate the proliferation of hepatoma cells (P<0.05), and this effect might be significantly inhibited by tyrosine kinase inhibitor (P<0.001). Calmodulin inhibitor W-7 had no effect on the basic phase of cultured hepatoma cells (P> 0.05), but it had very significantly inhibitory effect on the proliferation of hepatoma cells induced by EGF (P<0.001). Voltage-dependent Ca 2+ channel inhibitor Varapamil had no inhibition on the proliferation of hepatoma cells induced by EGF (P>0.05). It had no effect on the basic phase of cultured hepatoma cells (P>0.05). It is suggested that tyrosine kinase and Ca 2+-calmodulin-dependent pathway may play a critical role on the proliferation of heptoma cells induced by EGF, and voltage-dependent Ca 2+ channel is independent of the effect of EGF.展开更多
研究β2糖蛋白I(β2GPI)与肝细胞相互作用的过程,以进一步探讨β2GPI在乙型肝炎病毒感染肝细胞过程中所发挥的作用。采用L igand b lot技术,从SMMC-7721、HL-60及SGC-7901三个细胞株中,筛选出具有与人β2GPI特异结合蛋白成分的细胞。SMM...研究β2糖蛋白I(β2GPI)与肝细胞相互作用的过程,以进一步探讨β2GPI在乙型肝炎病毒感染肝细胞过程中所发挥的作用。采用L igand b lot技术,从SMMC-7721、HL-60及SGC-7901三个细胞株中,筛选出具有与人β2GPI特异结合蛋白成分的细胞。SMMC-7721细胞在40kD处出现一特异染色带,而HL-60及SGC-7901二种细胞则无此反应。在SMMC-7721细胞中存在有与人β2GPI特异结合的蛋白,这种蛋白可能参与了HBV感染肝细胞的过程。展开更多
目的:研究聚腺苷酸二磷酸核糖转移酶-1(PARP-1)抑制剂PJ34对人肝癌细胞株HepG2增殖的影响及其作用机制,以及PJ34是否进一步增强γ射线对肝癌细胞的增殖抑制作用.方法:细胞增殖实验观察不同浓度的PJ34,以及PJ34合并γ射线照射对HepG2细...目的:研究聚腺苷酸二磷酸核糖转移酶-1(PARP-1)抑制剂PJ34对人肝癌细胞株HepG2增殖的影响及其作用机制,以及PJ34是否进一步增强γ射线对肝癌细胞的增殖抑制作用.方法:细胞增殖实验观察不同浓度的PJ34,以及PJ34合并γ射线照射对HepG2细胞增殖的影响,流式细胞仪检测PJ34对HepG2细胞凋亡的影响.结果:PJ34对HepG2细胞的增殖有显著的抑制作用(t=15.175,P<0.01).随着PJ34浓度的增加,其抑制作用进一步增强.1Gy的γ射线照射对HepG2细胞的增殖有明显抑制作用,但γ射线照射联合PJ34与单用PJ34或γ射线照射对肝癌细胞的增殖抑制作用相比较无明显统计学差异(t=-1.413,P>0.05).PJ34能诱导HepG2细胞凋亡,72h时凋亡率明显高于对照组,二者有显著性差异(33.2% vs 11.4%,P<0.01).结论:PARP-1抑制剂PJ34通过诱导HepG2细胞凋亡抑制人肝癌细胞的增殖;PJ34并不显著增加γ射线对HepG2细胞增殖的抑制作用.展开更多
文摘The effect of thyrosine kinase, calmodulin and voltage-dependent Ca 2+ channel on the proliferation of hepatoma cells induced by EGF was studied. Hepatoma cell line SMMC7721 was cultured in RPMI1640 serum-free medium. DNA synthesis rate of hepatoma cells was measured by 3H-TdR incorporation. 10 -9 mol/L EGF could significantly stimulate the proliferation of hepatoma cells (P<0.05), and this effect might be significantly inhibited by tyrosine kinase inhibitor (P<0.001). Calmodulin inhibitor W-7 had no effect on the basic phase of cultured hepatoma cells (P> 0.05), but it had very significantly inhibitory effect on the proliferation of hepatoma cells induced by EGF (P<0.001). Voltage-dependent Ca 2+ channel inhibitor Varapamil had no inhibition on the proliferation of hepatoma cells induced by EGF (P>0.05). It had no effect on the basic phase of cultured hepatoma cells (P>0.05). It is suggested that tyrosine kinase and Ca 2+-calmodulin-dependent pathway may play a critical role on the proliferation of heptoma cells induced by EGF, and voltage-dependent Ca 2+ channel is independent of the effect of EGF.
文摘研究β2糖蛋白I(β2GPI)与肝细胞相互作用的过程,以进一步探讨β2GPI在乙型肝炎病毒感染肝细胞过程中所发挥的作用。采用L igand b lot技术,从SMMC-7721、HL-60及SGC-7901三个细胞株中,筛选出具有与人β2GPI特异结合蛋白成分的细胞。SMMC-7721细胞在40kD处出现一特异染色带,而HL-60及SGC-7901二种细胞则无此反应。在SMMC-7721细胞中存在有与人β2GPI特异结合的蛋白,这种蛋白可能参与了HBV感染肝细胞的过程。
文摘目的:研究聚腺苷酸二磷酸核糖转移酶-1(PARP-1)抑制剂PJ34对人肝癌细胞株HepG2增殖的影响及其作用机制,以及PJ34是否进一步增强γ射线对肝癌细胞的增殖抑制作用.方法:细胞增殖实验观察不同浓度的PJ34,以及PJ34合并γ射线照射对HepG2细胞增殖的影响,流式细胞仪检测PJ34对HepG2细胞凋亡的影响.结果:PJ34对HepG2细胞的增殖有显著的抑制作用(t=15.175,P<0.01).随着PJ34浓度的增加,其抑制作用进一步增强.1Gy的γ射线照射对HepG2细胞的增殖有明显抑制作用,但γ射线照射联合PJ34与单用PJ34或γ射线照射对肝癌细胞的增殖抑制作用相比较无明显统计学差异(t=-1.413,P>0.05).PJ34能诱导HepG2细胞凋亡,72h时凋亡率明显高于对照组,二者有显著性差异(33.2% vs 11.4%,P<0.01).结论:PARP-1抑制剂PJ34通过诱导HepG2细胞凋亡抑制人肝癌细胞的增殖;PJ34并不显著增加γ射线对HepG2细胞增殖的抑制作用.