Inhibitory effect of a new gossypol derivative apogossypolone (ApoG2) on xenograft of human prostate cancer cell line PC-3

Objective: To investigate the inhibitory effect of apogossypolone (ApoG2) on prostate cancer cell line PC-3 in vivo, and explore its mechanism. Methods: The models of transplantation tumors in Balb/c nu/nu mice were established via subcutaneous injection of PC-3 cells and the tumor-transplanted mice were divided into 4 groups: control group and three ApoG2 treatment groups, with 10 mice in each group. Volumes of the tumor were estimated every 2 d and the morphology of tumor tissues was observed. Immunohistochemistry was employed to observe the expression of Bcl-2, PCNA, CD31, caspase-3 and caspase-8 in tumor tissues. Results: ApoG2 (2.5 mg/kg-10 mg/kg) given intraperitoneally once a day can obviously inhibit the growth of subcutaneous prostatic carcinoma implant. The tumor volume decreased obviously when the treatment dosage was bigger than 5.0 mg/kg (P<0.01). Meanwhile, ApoG2 decreased the expression of PCNA and CD31, and enhanced the expression of caspases-3, caspase-8 in tumor tissues. Conclusion: ApoG2 exert an inhibitory effect on prostatic carcinoma possibly by inducing apoptosis and inhibiting tumor angiogenesis.

Sensitivity Evaluation of Two Human Breast Cancer Cell Lines to Tamoxifen through Apoptosis Induction

Tamoxifen citrate (TAM) has been used to treat breast cancer in women for many years. The com-parative effects of TAM in inducing apoptosis were evaluated in estrogen receptor-positive (ER- positive MCF-7) and estrogen receptor-negative (ER-negative MDA-MB-231) human breast cancer cell lines in vitro in order to determine if these two cell lines differ in their sensitivity to TAM. Mi-tochondrial membrane permeability potential disruption was assessed in both cell lines by a lip-ophilic cationic dye (DePsipher assay, Trevigen, Inc.) utilizing fluorescence microscopy. Using this specific fluorochrome, we were able to associate mitochondrial membrane disruption to early, mid-, and late apoptotic cells. TAM induced cell death via apoptosis in both ER-positive and ER- negative cells, however, apoptosis induction was more pronounced in ER-positive MCF-7 compared to ER-negative MDA-MB-231 breast cancer cells. These findings may have some therapeutic use in the treatment of estrogen dependent and estrogen independent breast cancer.

The establishment of stable transfection of human breast cancer cell line MDA-MD-468 with exogenous PTEN gene

To investigate exogenous PTEN gene transfected human breast cancer cell line MDA-MD-468.Methods Using the lipofectamine 2000 transfection technique,wild type PTEN gene was transducted into an in vitro cultured highly metastatic breast cancer cell line MDA-MD-468.After transfection,the cells were selected by G418.The resistant clones were chosen and expanded in DMEM culture medium.RT-PCR,immunohistochemical method and western blot were used to determine the expression of target genes.Results An anti-G418 cell clone was established and expanded in culture.The transfected PTEN gene MDA-MD-468 cells showed expression of PTEN mRNA and PTEN protein.Conclusion Human breast cancer cell line MDA-MB-468 established in this study expresses consistently exogenous PTEN genes.4 refs,6 figs.

Effects of 4-(3-Chloro-Benzyl)-6,7-Dimethoxy-Quinazoline on Kinetics of P120-Catenin and Periplakin in Human Buccal Mucosa Squamous Carcinoma Cell Line

In order to detect molecular markers for the epidermal growth factor inhibitor 4-(3-chloro-benzyl)- 6,7-dimethoxy-quinazoline (tyrphostin), we investigated the kinetics of p120-catenin and periplakin in the human buccal mucosa squamous cancer cell line BICR 10 treated with 3 nM tyrphostin. Growth of BICR 10 cells was inhibited by treatment with tyrphostin. Although changes were not observed in the expression of EGFR and p120-catenin, expression of Akt, Src and periplakin in BICR 10 treated with 3 nM tyrphostin tended to decrease. In addition, phosphorylation of EGFR, Akt and Src was inhibited by treatment with tyrphostin. On immunocytochemical staining, immunoreactions with phosphorylated EGFR, phosphorylated Akt and phosphorylated p120-catenin were weak in BICR 10 treated with tyrphostin. There was a slight immunocy to chemical reaction to periplakin in BICR 10 cells induced by tyrphostin. In conclusion, the decrease in phosphorylation in EGFR and p120-catenin by tyrphostin, following the decrease in Src or Akt phosphorylation, may inhibit expression of several growth factors associated with the proliferation and migration of cancer cells.

REVERSION OF MULTIDRUG RESISTANCE IN THE P-GLYCOPROTEIN POSITIVE BREAST CANCER CELL LINE(MCF-7/ADR) BY INTRODUCTION OF HAMMERHEAD RIBOZYME

A hammerhead ribozyme which site-specifically cleaved the GUC position in canon 880 of the mdr1 mRNA was designed. The target site was chosen between the two ATP binding sites, which may be important for the function of the P-Gp as an ATP-dependent pump. A DNA sequence encoding the ribozyme gene was then incorporated into a eukaryotic expression vector (pH Apr-1 neo) and transfected into the breast cancer cell line MCF-7/Adr, which is resistant to adriamycin and expresses the MDR phenotype. The ribozyme was stably expressed in the cell line by the RNA dot blotting assay. The result of Northern blot assay showed that the expressed ribozyme could decrease the level of mdrl mRNA expression by 83. 5 %; and the expressed ribozyme could inhibite the formation of p-glycoprotein detected by immuno- cy-tochemistry assay and could reduce the cell’s resistance to adrimycin; this means that the resistant cells were 1 000-fold more resistant than the parental cell line(MCF-7), whereas those cell clones that showed ribozyme expression were only 6-fold more resistant than the parental cell line. These results show that a potentially useful tool is at hand which may inactivate MDR1 mRNA and revert the multidrug resistance phenotype.

Fermented Herbal Decoction Selectively Targeting Human Cancer Cell Line and Human Pathogenic Microorganism

Introduction: Prolonged immuno-suppressed status promised to induce internal growth of malignant cell and infectious agent, yet, only a small part of affected individuals seek medical attention or berried by commercially over-flowed fake information. Several studies have described complementary and alternative medicine as effective strategies for improving anti-infectious agent including malignant cell. The purpose of this study was to investigate the effect of a fermented herbal decoction (FHD) both in vitro and in vivo to malignant cells and microorganism by regulating leukocyte subset proportioning FHD as dietary material. Methods: In this approach of alternative study, selective anti-cancer effect by fermented decoction was tried to show first in vitro system both, cancer cell and virus strain. The fermented herbal decoction consisting of 80 sorts of herbs and fruits. The selective toxicity was set up and then for immunological factors in animal and human. The most important factor is to reduce side effect for a normal cell. Results: First, FHD was proved as safe by animal test. FHD regulated also the proportion of granulocyte and lymphocyte ratio both animal and human. In vitro culture showed selective toxicity by FHD against human melanoma and leukemia cell line but reduced toxicity was showed by normal cell line. As for the anti-virus activity, anti-virus effect was tested on the feeder layer of human fibroblast cell, after 9 days of culture. Second, FHD inhibits colon cancer growth in 3-methylholanthrene induced cancer in rat. Conclusion: The present results suggest that our fermented herbal decoction showed selective anti-cancer activities and anti-virus activities, together with the regulative effect on the immune system.

Inhibitory Effects of Mild Hyperthermia plus Docetaxel Therapy on ER(+/–) Breast Cancer Cells and Action Mechanisms

Summary： The purpose of this study was to verify that a combination of mild hyperthermia and do- cetaxel chemotherapy produces synergistic antitumor effects and to explore the action mechanisms of this treatment approach. The effects of docetaxel on the proliferation of cells from the estrogen receptor （ER）-positive human breast cancer cell line MCF-7 and the ER-negative human breast cancer cell line MDA-MB-453 were examined by 3-（4,5-dimethylthiazol-2-yl）-2,5-diphenyltetrazolium bromide （MTT） assay, and effective experimental concentrations of docetaxel were determined. The effects of mild hy- perthermia plus docetaxel therapy on apoptosis rate in the MCF-7 and MDA-MB-453 human breast cancer cell lines were analyzed by using flow cytometry with Annexin-V fluorescein isothiocyanate （FITC）/propidium iodide （PI） staining. The effects of these combined treatments on cell cycle progres- sion in the MCF-7 and MDA-MB-453 human breast cancer cell lines were examined by using flow cy- tometry. The effects of these combined treatments on the expression of apoptosis-related proteins and proteins in the mitogen-activated protein kinase （MAPK） pathways were analyzed by using Western blotting. The effects of these combined treatments on the expression of the heat shock protein 70 （HSP70） and the multi-drug resistance （MDR） gene product P-glycoprotein （Pgp） were examined by using Western blotting. The results showed that the half-maximal inhibitory concentration （IC50） of do- cetaxel for MCF-7 and MDA-MB-453 cells was 19.57±1.12 and 21.64±2.31 gmol/L respectively. Mild hyperthermia with docetaxel therapy could increase apoptosis rate in the MCF-7 and MDA-MB-453 cells. Apoptosis rate in MCF-7 and MDA-MB-453 cells was increased from （23.66±3.59）% and （18.51±3.17）% in docetaxel treatment group to （47.12±6.73）% and （55.16±7.42）% in mild hyperthermia plus docetaxel group, indicating that the mild hyperthermia and docetaxel therapeutic approaches exhib- ited significant synergistic antitumor effects. Treatments of mild hyperthermia plus docetaxel induced G2/M cell cycle arrest in the MCF-7 and MDA-MB-453 cells. Western blotting demonstrated that pro- teins in the MAPK pathway were expressed at higher levels in docetaxel-treated cells following mild hypothermia than those in cells treated with docetaxel alone. As compared with blank control group, cells from the mild hyperthermia plus docetaxel group exhibited significantly decreased B-cell lym- phoma 2 （Bcl-2） protein expression but slightly increased Bcl-2-associated X protein （Bax） expression. Western blotting results revealed that HSP70 and Pgp expression levels were significantly increased following mild hypothermia. It was concluded that treatments of mild hyperthermia plus docetaxel in- hibited the proliferation of human breast cancer cells, promoted apoptosis of breast cancer cells, and produced synergistic antitumor effects.

Far Infrared Ray Radiation Inhibits the Proliferation of A549, HSC3 and Sa3 Cancer Cells through Enhancing the Expression of ATF3 Gene

Far-infrared ray (FIR) is electromagnetic wave between 4 and 1000 μm. FIR causes heating, but how it affects cells is not well understood. In this study, we developed a culture incubator that can continuously irradiate cells with FIR and examined the effects of FIR on five human cancer cell lines, namely A431 (vulva), A549 (lung), HSC3 (tongue), MCF7 (breast) and Sa3 (gingiva). We found that FIR inhibits cell proliferation and induces cell hypertrophy without apoptosis in A549, HSC3 and Sa3 cells. Flow cytometry revealed that the inhibition of proliferation was due to G2/M arrest. Contrary, FIR did not inhibit cell proliferation and cause cell hypertrophy in A431 or MCF7 cells. Microarray analysis revealed that FIR suppressed the expression of cell proliferation-related and stress-responsive genes in FIR-sensitive cell lines (A549, HSC3 and Sa3). ATF3 in particular was identified as a key mediator of the FIR effect. Over-expression of ATF3 inhibited cell proliferation and knockdown of ATF3 mRNA using an antisense oligonucleotide suppressed FIR-induced growth arrest. These results indicate that a body temperature range of FIR radiation suppresses the proliferation of A549, HSC3, Sa3 cells and it appears that ATF3 play important roles in this effect.

β-紫罗兰酮通过Caspase-3信号通路对乳腺癌细胞生物学行为的调控作用

目的研究β-紫罗兰酮通过Caspase-3信号对乳腺癌细胞生物学行为的调控作用。方法将人乳腺癌MCF-7细胞分为空白对照组与实验组,实验组按照β-紫罗兰酮的不同浓度,又分为25μmol/L组、50μmol/L组、100μmol/L组及200μmol/L组。分别采用CCK-8及台盼蓝计数法检测β-紫罗兰酮对MCF-7细胞增殖及生长曲线的影响,Hoechst 33258荧光染色法观察β-紫罗兰酮对MCF-7细胞凋亡形态的影响,RT-PCR及Western Blot法检测β-紫罗兰酮对Caspase-3 mRNA及蛋白表达的影响。结果与空白对照组相比,经不同浓度β-紫罗兰酮处理后的乳腺癌MCF-7细胞OD值均显著下降(P<0.05),实验组中经β-紫罗兰酮浓度25μmol/L、50μmol/L、100μmol/L及200μmol/L处理后的MCF-7细胞增殖抑制率分别为7.92%、28.96%、45.22%和56.83%。不同浓度β-紫罗兰酮处理过的MCF-7细胞从第2天开始,较空白对照组的细胞计数显著降低(P<0.05),空白组对照组及β-紫罗兰酮浓度为25μmol/L组MCF-7细胞计数在7 d内随时间迁移呈上升趋势,经β-紫罗兰酮浓度为50、100及200μmol/L处理后的MCF-7细胞7 d内细胞计数呈下降趋势。Hoechst 33258荧光染色法检测发现,与空白对照组相比,给予β-紫罗兰酮处理过的人乳腺癌MCF-7细胞伴有不同程度的凋亡现象,而经β-紫罗兰酮浓度为200μmol/L处理后的细胞凋亡现象最明显。与空白对照组相比,经不同浓度β-紫罗兰酮处理过的MCF-7细胞Caspase-3 mRNA及蛋白表达水平均显著上升(P<0.05),且随β-紫罗兰酮浓度的升高,其Caspase-3 mRNA及蛋白表达呈上升趋势(P<0.05)。结论β-紫罗兰酮可能通过激活Caspase-3信号通路,抑制乳腺癌细胞增殖与生长,促进其凋亡,发挥抑癌作用。

圣草酚通过miR-128-3p/MAPK轴对乳腺癌细胞增殖、凋亡的影响

目的圣草酚是一种重要的类黄酮,普遍存在于植物界,但少有对圣草酚的抗癌活性的报道。该研究旨在探究其对人乳腺癌(breast cancer,BC)的抗癌潜力及可能的机制。方法体外培养人乳腺癌细胞MCF-7和人乳腺上皮细胞FR2,通过MTT法检测圣草酚诱导的初始细胞毒性。再次培养MCF-7细胞,MTT法和集落形成实验评估圣草酚对MCF-7细胞增殖的影响;流式细胞术评估圣草酚对MCF-7细胞凋亡和线粒体膜电位(mitochondrial membrane potential,MMP)的作用;RT-qPCR和Western Blot法检测miR-128-3p和MAPK相关基因(p38 MAPK和HSP27)在圣草酚发挥抗癌功能中的作用。裸鼠体内异种移植模型中分析圣草酚对肿瘤生长的作用,TUNEL法检测圣草酚对细胞凋亡的影响。结果当圣草酚浓度超过12.5μmol·L^(-1)时,MCF-7细胞活力随着圣草酚浓度的增高而逐渐降低(P<0.05);圣草酚干预后,MCF-7细胞活力、集落形成数量和MMP均下调,细胞凋亡率增高(P<0.05);细胞中miR-128-3p水平增高,p38 MAPK和HSP27磷酸化水平均降低(P<0.05)。转染miR-128-3p抑制物在一定程度上可以逆转圣草酚对MCF-7细胞的影响(P<0.05);在转染miR-128-3p抑制物的基础上添加MAPK通路抑制剂可以削弱这种逆转作用(P<0.05)。此外,裸鼠体内异种移植模型实验证明了圣草酚可呈剂量依赖性降低裸鼠肿瘤组织生长,促进细胞凋亡(P<0.05)。结论圣草酚可有效抑制人乳腺癌细胞增殖并诱导细胞凋亡,这可能与其调控miR-128-3p/MAPK轴有关。

右美托咪定对人乳腺癌SKBR-3细胞株MAPK/JNK/Bcl-2信号通路及癌细胞转移、侵袭的影响

目的探讨右美托咪定对人乳腺癌SKBR-3细胞株MAPK/JNK/Bcl-2信号通路及癌细胞转移、侵袭的影响。方法人乳腺癌SKBR-3细胞株细胞设SKBR-3细胞组、顺铂组(100.0 μg/mL)、右美托咪定低剂量组(100.0 μg/mL)、右美托咪定高削量组(200.0 μg/mL),各组每孔设6个平行样,培养72 h。培养结束后,使用MTT测定法测定细胞活力,Giemsa溶液染色计算克隆形成教目,伤口愈合测试细胞侵袭能力,流式细胞仪测定细胞凋亡水平,RT-PCR法及western-blot法测细胞MAPK、JNK、Bcl-2基因和蛋白水平。结果与SKBR-3细胞组比较,顺柏组、右美托咪定低/高剂量组的OD值、存活率、克隆形成数目、侵袭距离、MAPK、JNK、Bcl-2 mRNA和蛋白水平均降低(P<0.05),凋亡率升高(P<0.05)。与顺铂组比较,右美托咪定低/高剂量组的OD值、存活率、克隆形成数目、侵袭距离、MAPK、JNK、Bcl-2 mRNA和蛋白水平均升高(P<0.05),凋亡率降低(P<0.05)。与右美托咪定低剂量组比较,右美托咪定高剂量组的OD值、存活率、克隆形成数目、侵袭距离、MAPK、JNK、Bcl-2 mRNA和蛋白水平均降低(P<0.05),凋亡率升高(P<0.05)。结论右美托咪定能明显抑制SKBR-3乳腺癌细胞增殖、转移、侵袭,促进其凋亡,与剂量呈正性相关,其作用机制可能与明显抑制SKBR-3细胞MAPK、JNK、Bcl-2 mRNA和蛋白的表达进而抑制MAPK/JNK/Bcl-2信号通路的激活有关。

Effect of 1,25(OH)_2D_3 on the growth and apoptosis of breast cancer cell line MCF-7

Objective To study the effect of 1,25 dihydroxyvitamin D 3 (1,25(OH) 2D 3) on the growth and apoptosis of breast cancer cell line MCF 7 Methods Cell number was determined using the MTT method Flow cytometric analysis was performed on cell cycles, and the percentage of apoptosis was counted Apoptotic cells were quantified by terminal deoxynucleotidyl transferase mediated dUTP nick end labeling (TUNEL), and bcl 2 protein expression was estimated with Western blotting Results After incubation with 1,25(OH) 2D 3 10 7 mol/L for 48 hours, MCF 7 cells exhibited significant growth in a dose and time dependent manner Flow cytometric analysis indicated that cell numbers in G 0/G 1 increased along with increasing apoptotic peak and percentage With microscope and electron microscope observation, characteristics of apoptosis such as typical apoptotic bodies were commonly found TUNEL also showed that 1,25(OH) 2D 3 10 8 mol/L and 10 7 mol/L groups had significantly high apoptosis percentage than control group with dose dependence on induction apoptosis And Western blot showed that 1,25(OH) 2D 3 10 8 mol/L could down regulate bcl 2 protein and 10 7 mol/L could almost block bcl 2 protein expression Conclusions 1,25(OH) 2D 3 can inhibit cell growth with G 0/G 1 arrest, enhance the proliferation inhibition action of adriamycin, and induce apoptosis which may result from the down regulation of the anti apoptotic bcl 2 protein

三羟异黄酮与化疗药物联合作用对人乳腺癌细胞株MDA-MB-453增殖的影响

目的观察三羟异黄酮（genistein,GEN）与紫杉醇（paclitaxel,PTX）或阿霉素（doxorubicin,DOX）联合作用对体外培养的HER2/neu高表达人乳腺癌细胞株MDA-MB -453增殖的作用,探讨三羟异黄酮和化疗药物的联合抗癌效应.方法 GEN和化疗药物PTX、DOX单独或联合处理体外培养的人乳腺癌细胞MDA-MB-453,MTT法测定细胞增殖抑制率并用联合用药公式分析合并效应,流式细胞仪分析细胞周期,形态学观察和Annexin-V-FITC/PI双标记法检测细胞凋亡.结果 GEN、PTX、DOX单独作用于乳腺癌MDA-MB-453细胞,均可抑制细胞增殖,引起细胞周期阻滞,并诱导细胞凋亡.10、20 μmol/L的GEN与DOX联合作用时,q值在0.85～1.15之间,二者的联合效应为相加效应;40 μmol/L的GEN与DOX联合作用时,q＞1.15,二者的联合效应为协同效应;而各剂量的GEN与PTX联合作用时,q＜0.85,二者的联合效应为拮抗作用.GEN（40 μmol/L）可增强DOX诱导MDA-MB-453细胞凋亡的作用,而削弱PTX诱导MDA-MB-453细胞凋亡的作用.结论 GEN能增加或协同DOX对MDA-MB-453细胞的抑制增殖作用,而拮抗PTX的抑制增殖作用.

去氢木香内酯诱导乳腺癌SK-BR-3细胞凋亡的机制研究

目的观察去氢木香内酯(Dehydrocostuslactone,Dehy)对乳腺癌SK-BR-3细胞增殖和凋亡的影响,并探讨其分子机制。方法体外培养乳腺癌SK-BR-3细胞,分别加入不同浓度Dehy(5、10、20、30、40、50、60、80、100μmol·L-1)作用24、48、72 h,采用CCK-8法检测细胞增殖抑制率。将SK-BR-3细胞分为空白对照组(0μmol·L-1)和Dehy 10、20、30μmol·L-1浓度组,干预48 h后,利用倒置显微镜观察乳腺癌SK-BR-3细胞的形态;采用流式细胞术检测细胞周期;Annexin V-FITC/PI双染法检测细胞凋亡率;Hoechst 33258荧光染色法检测细胞凋亡的形态学变化;Western Blot法检测Bcl-2、Bax、Caspase-3和Cleaved Caspase-3蛋白的表达。结果Dehy干预SK-BR-3细胞24、48、72 h后的IC50值分别为24.84、19.39、11.45μmol·L-1,且呈现浓度和时间依赖性。与空白对照组比较,Dehy 10、20、30μmol·L-1浓度组的SK-BR-3细胞数量明显减少,细胞结构松散、轮廓消失、变圆,贴壁不良;Dehy 10、20、30μmol·L-1浓度组的G2/M期细胞比例及细胞凋亡率均显著升高(P<0.05,P<0.01),呈明显的浓度依赖性;Dehy 10、20、30μmol·L-1浓度组的SK-BR-3细胞出现不同程度的细胞核浓染、固缩及碎裂等凋亡现象,且细胞核致密浓染的比例显著升高(P<0.05,P<0.01);Dehy 10、20、30μmol·L-1浓度组的Bax、Caspase-3和Cleaved Caspase-3蛋白表达显著上调(P<0.05,P<0.01),Bcl-2蛋白表达明显下调(P<0.05,P<0.01),Bax/Bcl-2比值明显升高(P<0.05,P<0.01)。结论Dehy能够抑制乳腺癌SK-BR-3细胞的增殖及诱导其凋亡,可能与其调控Bax/Bcl-2/Caspase-3凋亡信号通路来抑制乳腺癌细胞的抗凋亡能力有关。

木香烃内酯对人乳腺癌SK-BR-3细胞增殖、迁移和凋亡的影响及机制研究

目的:研究木香烃内酯对乳腺癌SK-BR-3细胞增殖、迁移和凋亡的影响及机制。方法:取对数生长期的SK-BR-3细胞,分别加入不同浓度(10、20、30、40、50μmol/L)的木香烃内酯作用24、48、72 h,采用CCK-8法检测细胞的增殖抑制率。将细胞分为空白对照组和木香烃内酯10、20、30μmol/L浓度组,采用Hoechst 33258荧光染色法观察细胞形态及凋亡情况,并计算细胞凋亡率;采用细胞划痕试验检测细胞的迁移能力,并计算迁移率;采用Western blotting法检测细胞中B淋巴细胞瘤因子2(Bcl-2)、Bcl-2相关X蛋白(Bax)、半胱氨酸蛋白酶3(Caspase-3)和分裂型Caspase-3(Cleaved Caspase-3)蛋白的相对表达水平。结果:木香烃内酯对SK-BR-3细胞具有显著的增殖抑制作用(P<0.05或P<0.01),且呈现浓度和时间依赖趋势。空白对照组细胞轮廓清晰、形态规则、贴壁较好;与空白对照组比较,木香烃内酯10、20、30μmol/L浓度组细胞数量明显减少,细胞结构松散、体积缩小、间隙变大,且多数细胞轮廓消失、变圆,贴壁不良;细胞迁移率和Bcl-2蛋白的相对表达水平均显著降低,细胞凋亡率和Bax、Caspase-3及Cleaved Caspase-3蛋白的相对表达水平均显著升高(P<0.05或P<0.01)。结论:木香烃内酯能抑制人乳腺癌SK-BR-3细胞增殖和迁移,诱导其凋亡,其作用机制可能与上调Bax、Caspase-3和Cleaved Caspase-3表达,下调Bcl-2表达有关。

人体乳腺癌细胞系Bcap－37和MCF－7的细胞遗传学研究

应用低温同步法与秋水酰胺处理，对人体乳腺癌细胞系Ｂｃａｐ－３７和ＭＣＦ－７的中期及早中期细胞进行Ｇ－显带分析。研究表明，Ｂｃａｐ－３７细胞染色体众数为６３，可识别其结构的标记染色体１７条；ＭＣＦ－７细胞染色体众数为５６，可识别其结构的标记染色体１３条。结合文献报道以及本研究结果显示，乳腺癌中最常涉及到第１、３、５、７、１１、１３和１７号染色体结构及数目的异常，染色体断裂点１ｐ１１（１ｑ１１）、１ｐ１３、３ｐ２１、３ｑ１１、５ｑ１１、６ｑ１３、６ｑ２３、７ｑ２２、１１ｐ１３和１１ｐ１５也经常涉及；它们可能与癌相关基因的激活和抗癌基因的丢失有关，从而在乳腺癌发生发展中起一定作用。

42℃温热联合顺铂对人卵巢癌细胞SKOV3毒性的影响

目的探讨42℃温热联合化疗药物顺铂对人卵巢癌细胞株SKOV-3作用的规律及其机制。方法应用四氮唑蓝快速比色法测定42℃热疗组、单纯化疗组以及以不同序贯方式结合的热化疗组对人卵巢癌细胞SKOV-3的生长抑制率;流式细胞仪测定各组细胞周期的变化;金氏公式分析相互作用指数,评价温热化疗两因素联合的作用。结果 42℃单纯热疗和单纯化疗均对卵巢癌癌细胞有抑制和杀伤作用;42℃热疗与化疗药物以不同方式联合,抑制作用均强于单纯化疗组和单纯热疗组(P<0.05),尤以热化疗同时作用组效果最佳(P<0.001);细胞周期分析发现:42℃热疗降低了S期细胞所占比例;与单纯化疗组相比,先化疗后热疗组、先热疗后化疗组和热化疗同时组的S期细胞所占比例减少,G1期细胞增多,其中热化疗同时组增减的幅度最大。结论 42℃温热可以明显增强化疗药顺铂的毒性,结合方式上以热化疗同时进行最佳,其作用机制可能与干扰细胞周期有关。

新型棉酚衍生物ApoG2对人前列腺癌PC-3移植瘤生长的抑制

目的:探讨棉酚衍生物ApoG2对前列腺癌的抑制作用,并了解其作用机理。方法:建立人前列腺癌细胞的裸鼠皮下移植瘤模型,在ApoG2作用下观察其对皮下移植瘤生长的抑制作用,通过免疫组化方法检测肿瘤组织中bcl-2、PCNA及caspase-3、-8的表达。结果:ApoG2可明显抑制前列腺癌皮下移植瘤生长速度,肿瘤体积明显减小,ApoG2能增加肿瘤组织中caspase-3、8的表达,减少PCNA表达。结论:ApoG2对人前列腺癌有显著的生长抑制作用。

ω-3多不饱和脂肪酸对人胃腺癌细胞系AGS的作用

目的探讨ω-3多不饱和脂肪酸对人胃腺癌AGS细胞生长增殖的作用和可能的机制。方法以不同浓度梯度的DHA、EPA作用于体外培养的AGS细胞和人微血管内皮细胞HMEC-1,采用四甲基偶氮唑蓝(MTT)观察细胞增殖抑制率,使用流式细胞仪检测细胞周期变化,采用Western blot分析细胞线粒体呼吸链膜蛋白复合体Ⅰ、Ⅱ、Ⅴ表达变化。结果 DHA和EPA对胃腺癌AGS细胞增殖具有明显抑制作用,该抑制作用呈现明显的剂量时间依赖效应的特点(P<0.05),在相同的浓度梯度下,DHA的抑制作用强于EPA(P<0.05)。倒置显微镜下DHA作用后观察到AGS细胞明显皱缩,细胞的贴壁能力明显减弱。流式细胞仪检测显示,DHA、EPA干预后AGS细胞的DNA合成前期(G0/G1期)细胞分布比例明显增加,DNA合成期(S期)细胞分布比例明显减少(P<0.05)。Western blot分析可见,DHA干预AGS细胞24h和48h后,与对照组比较,AGS线粒体呼吸链膜蛋白复合体Ⅰ、Ⅱ、Ⅴ表达灰度值显著下降,而且随着作用时间延长,复合体表达灰度值下降愈明显(P<0.05)。DHA对人微血管内皮细胞的生长增殖、细胞形态和线粒体呼吸链膜蛋白复合体无明显影响(P>0.05)。结论ω-3多不饱和脂肪酸可选择性有效地抑制人胃腺癌AGS细胞的生长增殖。该作用可能是通过阻滞AGS细胞于G0/G1期和抑制AGS细胞能量代谢来实现的。

瘦素作用于人乳腺癌SK-BR-3细胞的可能机制

目的观察瘦素对人乳腺癌SK-BR-3细胞增殖及对VEGF表达的影响,探讨其可能机制。方法不同浓度瘦素与人乳腺癌SK-BR-3细胞共同培养后,CCK-8法检测其对人乳腺癌SK-BR-3细胞增殖的影响,实时荧光定量PCR法及Western印迹法检测VEGF mRNA及蛋白表达情况。结果在一定范围内,瘦素呈时间、剂量依赖性促进SK-BR-3细胞的生长(P<0.05);细胞受不同浓度瘦素作用后VEGF mRNA及蛋白表达量明显增加并具有剂量依赖性(P<0.05)。结论在体外瘦素对人乳腺癌SK-BR-3细胞有明显增殖作用,通过促进VEGF的表达,在促进血管的生成及肿瘤转移机制中可能发挥一定作用。