目的:观察柴胡疏肝散联合他莫昔芬对大鼠乳腺增生的干预作用。方法:50只随机大鼠分为对照组,模型组,柴胡疏肝散(6.3 g·kg^(-1))组,他莫昔芬(1.67 mg·kg^(-1))组,柴胡疏肝散+他莫昔芬组。采用夹尾激怒法制备大鼠乳腺增生模型,...目的:观察柴胡疏肝散联合他莫昔芬对大鼠乳腺增生的干预作用。方法:50只随机大鼠分为对照组,模型组,柴胡疏肝散(6.3 g·kg^(-1))组,他莫昔芬(1.67 mg·kg^(-1))组,柴胡疏肝散+他莫昔芬组。采用夹尾激怒法制备大鼠乳腺增生模型,灌胃给药30d。酶联免疫法测定血清雌二醇,孕酮和催乳素,免疫组化法检测乳腺组织中雌激素受体及孕激素受体的表达。结果:与模型组比较,柴胡疏肝散联合他莫昔芬组大鼠血清中催乳素[(837.223±34.163)μg·L-1vs(346.215±43.114)μg·L-1,P<0.05]、雌二醇[(15.713±1.231)ng·L-1vs(4.973±0.278)ng·L-1,P<0.05)]的含量有效降低,孕酮[(0.423±0.031)μg·L-1vs(1.235±0.096)μg·L-1,P<0.05)]的含量提高;乳腺组织中雌激素受体表达显著被抑制(7.462±0.534 vs 4.889±0.343,P<0.05),孕激素受体的表达显著增强(1.212±0.53 vs 2.232±0.415,P<0.05)。结论:柴胡疏肝散联合他莫昔芬对大鼠乳腺增生有明显干预作用。展开更多
目的:探讨雌激素受体β(estrogen receptorβ,ERβ)的表达与乳腺癌他莫昔芬(tamoxifen,TAM)内分泌治疗耐药的相关性及其机制。方法:以前期构建的ERα/ERβ不同表达的人乳腺癌MCF-7细胞株[M/HK(阴性对照)、M/siα(ERαlow/ERβhigh)、M/s...目的:探讨雌激素受体β(estrogen receptorβ,ERβ)的表达与乳腺癌他莫昔芬(tamoxifen,TAM)内分泌治疗耐药的相关性及其机制。方法:以前期构建的ERα/ERβ不同表达的人乳腺癌MCF-7细胞株[M/HK(阴性对照)、M/siα(ERαlow/ERβhigh)、M/siβ(ERαhigh/ERβlow)细胞]为研究对象,MTT法评估乳腺癌细胞对TAM的耐药性;用半定量RT-PCR法检测细胞中耐药相关基因MDR1、TOPOⅡ、LRP和GST-π的mRNA表达水平,用Western blotting法检测细胞中耐药相关信号通路MAPK、PI3K/Akt的p-ERK、p-Akt蛋白表达水平。结果:与对照组MCF-7细胞相比,MCF-7细胞中的ERβ高表达可促进高浓度TAM(1、5、10μmol/L)对MCF-7细胞增殖的抑制作用[(45.788±1.641)%vs(24.288±1.170)%,(57.899±1.583)%vs(31.499±1.978)%,(59.853±1.648)%vs(38.039±1.482)%;均P<0.05)],该抑制作用与TAM浓度呈剂量依赖性。ERβ高表达可显著抑制MCF-7细胞耐药基因MDR1、TOPOⅡ、LRP的mRNA表达水平(0.431±0.032 vs 0.932±0.083,0.234±0.008 vs 0.391±0.002,0.47±0.028 vs 0.586±0.036;均P<0.05);可显著下调Akt和ERK蛋白的磷酸化水平(0.224±0.006 vs 0.437±0.007,0.367±0.015 vs 0.756±0.039;均P<0.05)。结论:ERβ表达水平可影响乳腺癌细胞MCF-7对TAM的耐药性,该作用机制可能与耐药基因的表达及PI3K/AKT、MAPK信号通路激活有关。展开更多
他莫昔芬(tamoxifen,TAM)作为雌激素受体阳性(estrogen receptor,ER+)乳腺癌的一线化疗药物使大多数患者受益,但原发性和继发性耐药问题严重影响临床治疗效果。深入研究ER+乳腺癌TAM耐药机制,改善治疗效果是当前亟待解决的问题。抑癌因...他莫昔芬(tamoxifen,TAM)作为雌激素受体阳性(estrogen receptor,ER+)乳腺癌的一线化疗药物使大多数患者受益,但原发性和继发性耐药问题严重影响临床治疗效果。深入研究ER+乳腺癌TAM耐药机制,改善治疗效果是当前亟待解决的问题。抑癌因子NDRG2(N-myc downstream regulated gene 2,NDRG2)在肿瘤发生发展中发挥重要作用,但是否参与ER+乳腺癌TAM耐药尚不清楚。本研究旨在探明NDRG2在ER+乳腺癌TAM耐药中发挥的作用和机制。通过RT-PCR与免疫印迹分析对比TAM敏感型和耐药型ER+乳腺癌细胞发现,NDRG 2的mRNA转录水平和蛋白质翻译水平在TAM耐药细胞中表达显著下调,且与耐药能力负相关(P<0.001);CCK-8细胞毒性实验和软琼脂克隆形成实验证实,在耐药细胞中过表达NDRG2可显著降低TAM药物半抑制浓度IC 50和软琼脂克隆形成率(P<0.001),逆转耐药表型。分子机制上,X-box结合蛋白1(X-box binding protein 1,XBP1)mRNA剪切实验与内质网相关降解(endoplasmic-reticulum associated degradation,ERAD)报告蛋白的结果显示,过表达NDRG2可增强耐药细胞中剪切型XBP1s mRNA转录与ERAD报告蛋白CD3ε-YFP表达(P<0.001),引发耐药细胞内质网强应激反应;免疫印迹检测结果显示,过表达NDRG2可显著提高耐药细胞中内质网应激感受器肌醇需要激酶1α(inositol requiring enzyme 1,IRE1α)的磷酸化水平及其下游因子,例如内质网EIP辅助因子(endoplasmic reticulum-localized DnaJ 4,ERdj4)、PKR蛋白激酶的细胞抑制剂(cellular Inhibitor of the PKR protein kinase,P58 IPK)、α甘露糖苷酶样应激蛋白(er degradation enhancingαmannosidase likeprotein,EDEM)和蛋白质二硫键异构酶家族A成员5(protein disulfide isomerase family a member 5,PDIA5)的表达水平(P<0.001)。小鼠异种移植瘤研究进一步证实,在耐药细胞中过表达NDRG2可增强TAM治疗效果,显著抑制耐药移植瘤生长(P<0.001)。以上研究结果表明,通过提高耐药细胞中NDRG2表达,展开更多
Objective To investigate the anti-tumor effect and mechanism of tamoxifen on rat C6 glioma cells. Methods C6 cells were cultured in Dulbecco’s modified Eagle’s medium (DMEM) with 3% fetal calf serum (FCS), and treat...Objective To investigate the anti-tumor effect and mechanism of tamoxifen on rat C6 glioma cells. Methods C6 cells were cultured in Dulbecco’s modified Eagle’s medium (DMEM) with 3% fetal calf serum (FCS), and treated with tamoxifen of different concentrations, i.e. group A (1.25μmol/L), group B (2.50 μmol/L), group C (5.00 μmol/L), group D (10.00 μmol/L), group E (20.00 μmol/L) and control group (0.00 μmol/L). Morphological changes, MTT assay and 5-bromo-2’-deoxyuriding labeling ratio were assessed. Apoptosis was observed by flow cytometry. Results C6 cells treated with different doses of tamoxifen for 24, 48, and 72 hours became irregular in shape, while cells treated with vehicle grew normally. MTT assay showed that tamoxifen did not suppress C6 cell growth until 72 hours after treatment. Seventy-two hours after treatment, there were significant differences in cell viable rate between group A versus groups C, D and E; so did group B versus group D as well as group E (P<0.05). BrdU incorporation assay indicated significant difference of BrdU labbled index (BrdU LI) among groups A, C, E and control group 48 hours after treatment (P<0.05). And the BrdU LI decreased with the increased concentration of tamoxifen. Flow cytometry (FCM) showed significant difference between treated group and control group at 24, 48, and 72 hours after treatment (P<0.05). Conclusion Tamoxifen significantly suppresses the growth of C6 glioma cells in a time-and dose-dependent manner. The mechanism of tamoxifen suppressing C6 glioma cells may be inhibiting proliferation and inducing apoptosis. Therefore, tamoxifen can be a candidate as a chemotherapy agent for glioma.展开更多
文摘目的:观察柴胡疏肝散联合他莫昔芬对大鼠乳腺增生的干预作用。方法:50只随机大鼠分为对照组,模型组,柴胡疏肝散(6.3 g·kg^(-1))组,他莫昔芬(1.67 mg·kg^(-1))组,柴胡疏肝散+他莫昔芬组。采用夹尾激怒法制备大鼠乳腺增生模型,灌胃给药30d。酶联免疫法测定血清雌二醇,孕酮和催乳素,免疫组化法检测乳腺组织中雌激素受体及孕激素受体的表达。结果:与模型组比较,柴胡疏肝散联合他莫昔芬组大鼠血清中催乳素[(837.223±34.163)μg·L-1vs(346.215±43.114)μg·L-1,P<0.05]、雌二醇[(15.713±1.231)ng·L-1vs(4.973±0.278)ng·L-1,P<0.05)]的含量有效降低,孕酮[(0.423±0.031)μg·L-1vs(1.235±0.096)μg·L-1,P<0.05)]的含量提高;乳腺组织中雌激素受体表达显著被抑制(7.462±0.534 vs 4.889±0.343,P<0.05),孕激素受体的表达显著增强(1.212±0.53 vs 2.232±0.415,P<0.05)。结论:柴胡疏肝散联合他莫昔芬对大鼠乳腺增生有明显干预作用。
文摘目的:探讨雌激素受体β(estrogen receptorβ,ERβ)的表达与乳腺癌他莫昔芬(tamoxifen,TAM)内分泌治疗耐药的相关性及其机制。方法:以前期构建的ERα/ERβ不同表达的人乳腺癌MCF-7细胞株[M/HK(阴性对照)、M/siα(ERαlow/ERβhigh)、M/siβ(ERαhigh/ERβlow)细胞]为研究对象,MTT法评估乳腺癌细胞对TAM的耐药性;用半定量RT-PCR法检测细胞中耐药相关基因MDR1、TOPOⅡ、LRP和GST-π的mRNA表达水平,用Western blotting法检测细胞中耐药相关信号通路MAPK、PI3K/Akt的p-ERK、p-Akt蛋白表达水平。结果:与对照组MCF-7细胞相比,MCF-7细胞中的ERβ高表达可促进高浓度TAM(1、5、10μmol/L)对MCF-7细胞增殖的抑制作用[(45.788±1.641)%vs(24.288±1.170)%,(57.899±1.583)%vs(31.499±1.978)%,(59.853±1.648)%vs(38.039±1.482)%;均P<0.05)],该抑制作用与TAM浓度呈剂量依赖性。ERβ高表达可显著抑制MCF-7细胞耐药基因MDR1、TOPOⅡ、LRP的mRNA表达水平(0.431±0.032 vs 0.932±0.083,0.234±0.008 vs 0.391±0.002,0.47±0.028 vs 0.586±0.036;均P<0.05);可显著下调Akt和ERK蛋白的磷酸化水平(0.224±0.006 vs 0.437±0.007,0.367±0.015 vs 0.756±0.039;均P<0.05)。结论:ERβ表达水平可影响乳腺癌细胞MCF-7对TAM的耐药性,该作用机制可能与耐药基因的表达及PI3K/AKT、MAPK信号通路激活有关。
文摘他莫昔芬(tamoxifen,TAM)作为雌激素受体阳性(estrogen receptor,ER+)乳腺癌的一线化疗药物使大多数患者受益,但原发性和继发性耐药问题严重影响临床治疗效果。深入研究ER+乳腺癌TAM耐药机制,改善治疗效果是当前亟待解决的问题。抑癌因子NDRG2(N-myc downstream regulated gene 2,NDRG2)在肿瘤发生发展中发挥重要作用,但是否参与ER+乳腺癌TAM耐药尚不清楚。本研究旨在探明NDRG2在ER+乳腺癌TAM耐药中发挥的作用和机制。通过RT-PCR与免疫印迹分析对比TAM敏感型和耐药型ER+乳腺癌细胞发现,NDRG 2的mRNA转录水平和蛋白质翻译水平在TAM耐药细胞中表达显著下调,且与耐药能力负相关(P<0.001);CCK-8细胞毒性实验和软琼脂克隆形成实验证实,在耐药细胞中过表达NDRG2可显著降低TAM药物半抑制浓度IC 50和软琼脂克隆形成率(P<0.001),逆转耐药表型。分子机制上,X-box结合蛋白1(X-box binding protein 1,XBP1)mRNA剪切实验与内质网相关降解(endoplasmic-reticulum associated degradation,ERAD)报告蛋白的结果显示,过表达NDRG2可增强耐药细胞中剪切型XBP1s mRNA转录与ERAD报告蛋白CD3ε-YFP表达(P<0.001),引发耐药细胞内质网强应激反应;免疫印迹检测结果显示,过表达NDRG2可显著提高耐药细胞中内质网应激感受器肌醇需要激酶1α(inositol requiring enzyme 1,IRE1α)的磷酸化水平及其下游因子,例如内质网EIP辅助因子(endoplasmic reticulum-localized DnaJ 4,ERdj4)、PKR蛋白激酶的细胞抑制剂(cellular Inhibitor of the PKR protein kinase,P58 IPK)、α甘露糖苷酶样应激蛋白(er degradation enhancingαmannosidase likeprotein,EDEM)和蛋白质二硫键异构酶家族A成员5(protein disulfide isomerase family a member 5,PDIA5)的表达水平(P<0.001)。小鼠异种移植瘤研究进一步证实,在耐药细胞中过表达NDRG2可增强TAM治疗效果,显著抑制耐药移植瘤生长(P<0.001)。以上研究结果表明,通过提高耐药细胞中NDRG2表达,
文摘Objective To investigate the anti-tumor effect and mechanism of tamoxifen on rat C6 glioma cells. Methods C6 cells were cultured in Dulbecco’s modified Eagle’s medium (DMEM) with 3% fetal calf serum (FCS), and treated with tamoxifen of different concentrations, i.e. group A (1.25μmol/L), group B (2.50 μmol/L), group C (5.00 μmol/L), group D (10.00 μmol/L), group E (20.00 μmol/L) and control group (0.00 μmol/L). Morphological changes, MTT assay and 5-bromo-2’-deoxyuriding labeling ratio were assessed. Apoptosis was observed by flow cytometry. Results C6 cells treated with different doses of tamoxifen for 24, 48, and 72 hours became irregular in shape, while cells treated with vehicle grew normally. MTT assay showed that tamoxifen did not suppress C6 cell growth until 72 hours after treatment. Seventy-two hours after treatment, there were significant differences in cell viable rate between group A versus groups C, D and E; so did group B versus group D as well as group E (P<0.05). BrdU incorporation assay indicated significant difference of BrdU labbled index (BrdU LI) among groups A, C, E and control group 48 hours after treatment (P<0.05). And the BrdU LI decreased with the increased concentration of tamoxifen. Flow cytometry (FCM) showed significant difference between treated group and control group at 24, 48, and 72 hours after treatment (P<0.05). Conclusion Tamoxifen significantly suppresses the growth of C6 glioma cells in a time-and dose-dependent manner. The mechanism of tamoxifen suppressing C6 glioma cells may be inhibiting proliferation and inducing apoptosis. Therefore, tamoxifen can be a candidate as a chemotherapy agent for glioma.
文摘39例临床表现为难治性肿瘤(肺癌35例,其他实体瘤4例)。其中74.4%(29/39)伴血液播散。当化疗无效时,于原方案基础上加三笨氧胺(Tamoxifen,TAM)60～80mg/d,共8～10d,d4开始化疗。3次化疗后评定疗效。共33.3%(13/39)达 PR,无 CR者。化疗毒性轻至中度,与 TAM 并用前相似(P>0.05)。小细胞肺癌(SCLC)及低分化鳞、腺型肺癌;初治有效,后为难治性者,为并用 TAM 后再次达缓解的有利因素(P=0.007及<0.05)。7/13例仍 PR 中,生存期已7~+～19~+月。
