目的探讨环状RNA(circ)_0003028对人肝癌细胞增殖、迁移和侵袭的影响及分子机制。方法人肝癌细胞系Huh7分为小干扰RNA(si)-NC组、si-circ_0003028组、微小RNA(miR)-NC组、miR-498模似物(mimics)组、si-circ_0003028+anti-miR-NC组、si-c...目的探讨环状RNA(circ)_0003028对人肝癌细胞增殖、迁移和侵袭的影响及分子机制。方法人肝癌细胞系Huh7分为小干扰RNA(si)-NC组、si-circ_0003028组、微小RNA(miR)-NC组、miR-498模似物(mimics)组、si-circ_0003028+anti-miR-NC组、si-circ_0003028+anti-miR-498组;Real-time PCR检测肝癌组织及各组细胞中circ_0003028和miR-498表达水平;MTT检测细胞增殖;Transwell检测细胞迁移和侵袭数;Western blotting检测蛋白表达;双荧光素酶报告实验检测circ_0003028和miR-498的靶向调控关系。结果肝癌组织中circ_0003028表达水平升高(0.98±0.02 vs 1.36±0.01),miR-498表达水平降低(0.98±0.02 vs 0.63±0.02)(P<0.05)。抑制circ_0003028表达或miR-498过表达后,Huh7细胞中Ki-67(0.85±0.02 vs 0.41±0.02或0.95±0.11 vs 0.37±0.02)、基质金属蛋白酶(MMP)-2(0.71±0.02 vs 0.43±0.03或0.83±0.02 vs 0.41±0.03)、MMP-9(0.74±0.02 vs 0.37±0.02或0.78±0.02 vs 0.39±0.02)蛋白表达水平降低,细胞活性(1.53±0.03 vs 1.05±0.02或1.68±0.02 vs 1.11±0.02)降低;迁移(111.40±2.12 vs 77.22±2.38或108.90±2.30 vs 78.44±1.46)和侵袭(87.89±2.18 vs 49.78±1.98或80.22±1.79 vs 38.22±1.52)细胞数减少,生殖器形成抑制基因-1(SMG-1)(0.76±0.02 vs 1.39±0.02或0.79±0.02 vs 1.39±0.02)、p53(0.77±0.02 vs 1.24±0.03或0.82±0.03 vs 1.45±0.03)、p53-ser15(0.78±0.03 vs 1.50±0.02或0.82±0.02 vs 1.49±0.04)蛋白表达水平升高(P<0.05)。Circ_0003028靶向调控miR-498,沉默miR-498逆转了抑制circ_0003028表达对Huh7细胞增殖、迁移和侵袭的影响。结论抑制circ_0003028表达通过靶向miR-498影响SMG-1/p53信号通路而抑制人肝癌细胞增殖、迁移和侵袭。展开更多
目的:探讨枸杞水提取物对Bel-7402人肝癌细胞增殖的影响。方法:用RPMI-1640完全培养液温育Bel-7402人肝癌细胞,分为空白对照组和药物组,空白对照组给予培养液处理,药物组分为低剂量组(100μg/m L)和高剂量组(200μg/mL),实验过程加入相...目的:探讨枸杞水提取物对Bel-7402人肝癌细胞增殖的影响。方法:用RPMI-1640完全培养液温育Bel-7402人肝癌细胞,分为空白对照组和药物组,空白对照组给予培养液处理,药物组分为低剂量组(100μg/m L)和高剂量组(200μg/mL),实验过程加入相应剂量的枸杞子水提取物。于倒置显微镜下观察三组细胞形态学变化,采用流式细胞仪观察细胞的凋亡状况及活性氧簇(ROS)含量,采用MTT法检测细胞增殖的抑制作用,采用反转录-聚合酶链式反应(RT-PCR)检测Bel-7402细胞中bax m RNA和bcl-2 m RNA的表达。结果:在倒置显微镜下观察,枸杞子水提取物使Bel-7402细胞生长受到抑制,表现为细胞贴壁减少、脱落增加,脱落的细胞浮悬于培养液中,呈圆形,体积缩小。枸杞子水提取物可促进Bel-7402细胞凋亡,药物组Bel-7402细胞的凋亡率比空白对照组明显增加(P<0.01),G0/G1期细胞比率减少(P<0.05),G2/M2期细胞比率增加(P<0.05),且ROS含量增加(P<0.05)。枸杞子水提取物对Bel-7402细胞的生长有明显抑制作用,且抑制率随着培养时间的延长而增加,且高剂量组在96小时时抑制率最高。药物组Bel-7402细胞中bax基因灰度比值显著高于空白对照组(P<0.01),bcl-2基因灰度比值显著低于空白对照组(P<0.01)。结论:枸杞子水提取物可抑制Bel-7402人肝癌细胞的增殖、阻滞细胞周期、诱导细胞凋亡,增加ROS含量,促进bax基因表达,抑制bcl-2基因表达,该实验结果可为枸杞子抗肝癌作用提供实验依据。展开更多
Aim:Cancer stem cells(CSCs)are highly resistant to chemotherapy andγ-irradiation.Neutrons have a high linear energy transfer,which can lead to extensive damage to the DNA of tumor cells and CSCs.The aim of this work ...Aim:Cancer stem cells(CSCs)are highly resistant to chemotherapy andγ-irradiation.Neutrons have a high linear energy transfer,which can lead to extensive damage to the DNA of tumor cells and CSCs.The aim of this work was to compare the sensitivity of MCF-7 human breast adenocarcinoma cells and CSCs toγ-andγ,n-irradiation.Methods:To increase the number of CSCs,MCF-7 cells were cultured as mammospheres.γ-irradiation was carried out in a GUT-200M device(^(60)Co source)in the dose range of 1-8 Gy at a dose rate of 0.75 Gy/min.γ,n-irradiation was carried out in an IR-8 reactor in the dose range of 0.05-2 Gy at a dose rate of 0.06 Gy/min.DNA DSB formation was assessed by the level ofγH2AX foci using fluorescence microscopy and flow cytometry.CSCs were identified by flow cytometry as CD44^(+)/CD24^(-/low) cells.Results:We showed thatγ,n-irradiation induced the formation ofγH2AX foci of a larger size than didγ-irradiation and led to more severe DNA damage per 1 Gy.Moreover,γ,n-radiation was found to have a high relative biological effectiveness(RBE)as assessed by the cell survival rate,the number of CSCs in culture,and the ability of CSCs to repopulate.The highest RBE of neutron radiation was observed at low doses,when cell survival rate decreased by only 5%-10%.With an increase in the radiation dose,the RBE value decreased for all studied parameters,but it remained as high as 5.Conclusion:γ,n-radiation is highly effective against CSCs.Our results explain the efficacy of neutron therapy for resistant forms of breast cancer.展开更多
文摘目的探讨环状RNA(circ)_0003028对人肝癌细胞增殖、迁移和侵袭的影响及分子机制。方法人肝癌细胞系Huh7分为小干扰RNA(si)-NC组、si-circ_0003028组、微小RNA(miR)-NC组、miR-498模似物(mimics)组、si-circ_0003028+anti-miR-NC组、si-circ_0003028+anti-miR-498组;Real-time PCR检测肝癌组织及各组细胞中circ_0003028和miR-498表达水平;MTT检测细胞增殖;Transwell检测细胞迁移和侵袭数;Western blotting检测蛋白表达;双荧光素酶报告实验检测circ_0003028和miR-498的靶向调控关系。结果肝癌组织中circ_0003028表达水平升高(0.98±0.02 vs 1.36±0.01),miR-498表达水平降低(0.98±0.02 vs 0.63±0.02)(P<0.05)。抑制circ_0003028表达或miR-498过表达后,Huh7细胞中Ki-67(0.85±0.02 vs 0.41±0.02或0.95±0.11 vs 0.37±0.02)、基质金属蛋白酶(MMP)-2(0.71±0.02 vs 0.43±0.03或0.83±0.02 vs 0.41±0.03)、MMP-9(0.74±0.02 vs 0.37±0.02或0.78±0.02 vs 0.39±0.02)蛋白表达水平降低,细胞活性(1.53±0.03 vs 1.05±0.02或1.68±0.02 vs 1.11±0.02)降低;迁移(111.40±2.12 vs 77.22±2.38或108.90±2.30 vs 78.44±1.46)和侵袭(87.89±2.18 vs 49.78±1.98或80.22±1.79 vs 38.22±1.52)细胞数减少,生殖器形成抑制基因-1(SMG-1)(0.76±0.02 vs 1.39±0.02或0.79±0.02 vs 1.39±0.02)、p53(0.77±0.02 vs 1.24±0.03或0.82±0.03 vs 1.45±0.03)、p53-ser15(0.78±0.03 vs 1.50±0.02或0.82±0.02 vs 1.49±0.04)蛋白表达水平升高(P<0.05)。Circ_0003028靶向调控miR-498,沉默miR-498逆转了抑制circ_0003028表达对Huh7细胞增殖、迁移和侵袭的影响。结论抑制circ_0003028表达通过靶向miR-498影响SMG-1/p53信号通路而抑制人肝癌细胞增殖、迁移和侵袭。
文摘目的:探讨枸杞水提取物对Bel-7402人肝癌细胞增殖的影响。方法:用RPMI-1640完全培养液温育Bel-7402人肝癌细胞,分为空白对照组和药物组,空白对照组给予培养液处理,药物组分为低剂量组(100μg/m L)和高剂量组(200μg/mL),实验过程加入相应剂量的枸杞子水提取物。于倒置显微镜下观察三组细胞形态学变化,采用流式细胞仪观察细胞的凋亡状况及活性氧簇(ROS)含量,采用MTT法检测细胞增殖的抑制作用,采用反转录-聚合酶链式反应(RT-PCR)检测Bel-7402细胞中bax m RNA和bcl-2 m RNA的表达。结果:在倒置显微镜下观察,枸杞子水提取物使Bel-7402细胞生长受到抑制,表现为细胞贴壁减少、脱落增加,脱落的细胞浮悬于培养液中,呈圆形,体积缩小。枸杞子水提取物可促进Bel-7402细胞凋亡,药物组Bel-7402细胞的凋亡率比空白对照组明显增加(P<0.01),G0/G1期细胞比率减少(P<0.05),G2/M2期细胞比率增加(P<0.05),且ROS含量增加(P<0.05)。枸杞子水提取物对Bel-7402细胞的生长有明显抑制作用,且抑制率随着培养时间的延长而增加,且高剂量组在96小时时抑制率最高。药物组Bel-7402细胞中bax基因灰度比值显著高于空白对照组(P<0.01),bcl-2基因灰度比值显著低于空白对照组(P<0.01)。结论:枸杞子水提取物可抑制Bel-7402人肝癌细胞的增殖、阻滞细胞周期、诱导细胞凋亡,增加ROS含量,促进bax基因表达,抑制bcl-2基因表达,该实验结果可为枸杞子抗肝癌作用提供实验依据。
基金The work was supported by the National Research Center“Kurchatov Institute”.
文摘Aim:Cancer stem cells(CSCs)are highly resistant to chemotherapy andγ-irradiation.Neutrons have a high linear energy transfer,which can lead to extensive damage to the DNA of tumor cells and CSCs.The aim of this work was to compare the sensitivity of MCF-7 human breast adenocarcinoma cells and CSCs toγ-andγ,n-irradiation.Methods:To increase the number of CSCs,MCF-7 cells were cultured as mammospheres.γ-irradiation was carried out in a GUT-200M device(^(60)Co source)in the dose range of 1-8 Gy at a dose rate of 0.75 Gy/min.γ,n-irradiation was carried out in an IR-8 reactor in the dose range of 0.05-2 Gy at a dose rate of 0.06 Gy/min.DNA DSB formation was assessed by the level ofγH2AX foci using fluorescence microscopy and flow cytometry.CSCs were identified by flow cytometry as CD44^(+)/CD24^(-/low) cells.Results:We showed thatγ,n-irradiation induced the formation ofγH2AX foci of a larger size than didγ-irradiation and led to more severe DNA damage per 1 Gy.Moreover,γ,n-radiation was found to have a high relative biological effectiveness(RBE)as assessed by the cell survival rate,the number of CSCs in culture,and the ability of CSCs to repopulate.The highest RBE of neutron radiation was observed at low doses,when cell survival rate decreased by only 5%-10%.With an increase in the radiation dose,the RBE value decreased for all studied parameters,but it remained as high as 5.Conclusion:γ,n-radiation is highly effective against CSCs.Our results explain the efficacy of neutron therapy for resistant forms of breast cancer.
