Induction of Apoptosis and Cell Cycle Arrest in Mouse Colon 26 Cells by Benastatin A

Benastatin A, isolated from Streptomyces bacteria, is reported to inhibit mammalian glutathione transferases (GSTs). Since GST inhibitors such as ethacrynic acid are suggested to induce apoptosis in some cell lines, the effect of benastatin A on the survival of mouse colon 26 adenocarcinoma cells was compared with that of ethacrynic acid. When cells in stationary phase were treated with benastatin A, viable cells were found to be dose-dependently decreased after 3 days. In the case of ethacrynic acid, this became apparent within 24 h. Electrophoretic analysis revealed DNA fragmentation, indicating that cell loss was due to apoptosis in both cases. The dominant GST in colon 26 cells was identified as the class Pi-form (GST-II), and the activities in crude extracts as well as purified GST-II were almost completely inhibited by 50 μ M ethacrynic acid. Immunoblot and northern blot analyses revealed increased GST-II protein and mRNA levels in cells treated with ethacrynic acid. Benastatin A did not significantly affect the activity in the crude extract even at 20 μ M , a 10-fold higher concentration than that which almost completely inhibited the activity of purified GST-II. However, GST activity and GST-II protein were decreased in colon 26 cells treated with benastatin A for 5 days, no significant activity being detected in the range of 16–20 μ M . In addition, β-actin and bax mRNAs were also decreased in a dose-dependent manner. Furthermore, flow cytometric analysis of colon 26 cells revealed that benastatin A blocked the cell cycle at the G1/G0 phase. Thus, benastatin A also induces apoptosis of colon 26 cells, but this is unlikely to be due to inhibition of GST activity.     

Effect of Sesamin on Apoptosis and Cell Cycle Arrest in Human Breast Cancer MCF-7 Cells

Dietary prevention has been known to reduce breast cancer risk. Sesamin is one of the major components insesame seeds and has been widely studied and proven to have anti-proliferation and anti-angiogenic effects oncancer cells. In this study, the influence of sesamin was tested in the human breast cancer MCF-7 cell line forcell viability (MTT assay) and cell cycling (flow cytometry). Results showed that sesamin dose-dependently (1,10 and 50 μM) reduced the cell viability and increased LDH release and apoptosis (TUNEL assay). In addition,there was a significant increase of sub-G1 phase arrest in the cell cycle after sesamin treatment. Furthermore,sesamin increased the expression of apoptotic markers of Bax, caspase-3, and cell cycle control proteins, p53 andcheckpoint kinase 2. Taken together, these results suggested that sesamin might be used as a dietary supplementf or prevention of breast cancer by modulating apoptotic signal pathways and inhibiting tumor cell growth.     

Anticancer Activity of Fucoidan via Apoptosis and Cell Cycle Arrest on Cholangiocarcinoma Cell

Objective: Many previous studies reported that fucoidan has antitumor activities. The objective of the present study was to determine the cytotoxic effects and related mechanisms of cell death induced by fucoidan extracted from Fucus vesiculosus on CL-6 cholangiocarcinoma cell. Methods: CL-6 and OUMS cells were treated with 0, 100, 200, and 300 μg/mL of fucoidan. MTT assay was used to determine cytotoxicity. Flow cytometry-based assay was used to examine the distribution of apoptosis and cell cycle. The changes in nuclear morphology were determined using Hoechst 33,342 staining. Mitochondrial membrane potential (ΔΨm) was evaluated using the JC-1 kit. The apoptotic, anti-apoptotic, and cell cycle-related proteins study were examined by Western blot analysis. Results: The relative viable cell number of treated CL-6 cells was decreased but no effect was observed in OUMS normal cells. Furthermore, treated cells were arrested in the G0/G1 phase with down-regulation of cyclin D1 and CDK4. Annexin V/PI staining with flow cytometry analysis suggested that fucoidan could induce apoptosis in CL-6 cells. Western blot study revealed the up-regulation of apoptotic markers including Bax, cleaved PARP, cleaved caspase-3, but down-regulation of anti-apoptotic markers,  cl-2. Moreover, fucoidan could induce nuclear fragmentation and chromatin condensation with alteration of ΔΨm.  Conclusion: Fucoidan exerts antitumor properties against CL-6 cholangiocarcinoma cells illustrated by the induction of apoptosis and cell cycle arrest.     

新合成吩嗪衍生物体外诱导癌细胞周期阻滞和凋亡的实验

目的 探讨新合成吩嗪衍生物抗癌活性及其作用机制。方法 MTT法检测细胞增殖,吖啶橙/溴乙锭（AO/EB）染色荧光显微镜观察细胞形态,流式细胞仪检测细胞周期,Annexin V-FITC/7-AAD双染检测凋亡,Western blot检测p53和caspase-3蛋白的表达。结果 pn18、pn23、pc27和pc28四种化合物在体外抑制癌细胞增殖,尤其对人结直肠癌细胞HCT116作用明显,且呈时间和剂量依赖性。pc28在四种化合物中作用最强,48 h对HepG2、HCT116和A549细胞半数抑制浓度（IC₅₀）分别为（6.62±2.69）、（10.83±1.41）和（22.39±4.31）μmol。20 μmol化合物作用于HCT116细胞24 h后,细胞密度降低,形态变圆,细胞内明亮绿色荧光与染色质浓缩相关,死亡细胞呈橙黄色和红色与细胞膜通透性增加有关;pc28诱导的细胞晚期凋亡比例由0.345%升高至19.7%。20 μmol pn18和pc27诱导G₀/G₁期细胞分别升高17.5%和25.0%,pn23和pc28诱导S期细胞分别升高18.4%和11.0%。pn23和pc28诱导p53表达升高,pc28也能上调并激活caspase-3。结论 四种合成的新型吩嗪衍生物在体外能有效抑制多种癌细胞增殖,其作用机制可能与诱导细胞周期阻滞和凋亡相关。     

Bracken-fern Extracts Induce Cell Cycle Arrest and Apoptosis in Certain Cancer Cell Lines

Bracken fern [Pteridium aquilinem (L.) kuhn (Dennstaedtiaceae)] is one of the most common species on the planet. It has been consumed by humans and animals for centuries. Use by some human groups is because theybelieve bracken fern is good for health as plant medicine. However, it is also one of the few known plants that can cause tumors in farm animals. Many interested groups have focused their attention on bracken fern because of these interesting features. In order to evaluate the biological effects of exposure to this plant in cellular level, human cancer cell lines were treated with the fern dichloromethane extracts and the genotoxic and cytotoxic effects were studied. Anti-proliferative/cytotoxic effects were evaluated by cell count, MTT assay and flow cytometry methods with three different cancer cell lines, TCC, NTERA2, and MCF-7, and two normal cells, HDF1 and HFF3. Pro-apoptotic effects of the extracts were determined by DAPI staining and comet assay, on TCC cancercells compared to the normal control cell lines. Cellular morphology was examined by light microscopy. Our present study showed that the extract caused DNA damage and apoptosis at high concentrations (200 μg/mL)and also it may induce cell cycle arrest (G2/M phase) at mild concentrations (50 and 30 μg/mL) depending on the cell type and tumor origin. These results indicate that bracken fern extract is a potent source of anticancercompounds that could be utilized pharmaceutically.     

Kaempferol Suppresses Proliferation and Induces Cell Cycle Arrest,Apoptosis, and DNA Damage in Breast Cancer Cells

Kaempferol is a flavonoid that has been extensively investigated owing to its antitumor effects. Nevertheless, little is known about its underlying mechanisms of action. We aimed to explore the role of kaempferol in breast cancer (BC), and thus we investigated how kaempferol suppresses the growth of BC cells. The cells were treated with kaempferol, and the effects on multiple cancer-associated pathways were evaluated. The MTS assay was used to study the cell growth inhibition induced by kaempferol. The cell cycle was analyzed by flow cytometry. Western blotting was used to analyze cellular apoptosis and DNA damage. We found that the proliferation of the triple-negative BC (TNBC) MDA-MB-231 cells was suppressed effectively by kaempferol. Interestingly, the suppressive effect of kaempferol on cell proliferation was stronger in MDA-MB-231 cells than in the estrogen receptor-positive BT474 cell line. Furthermore, after the treatment with kaempferol for 48 h, the population of cells in the G1 phase was significantly reduced, from 85.48% to 51.35%, and the population of cells in the G₂ phase increased markedly from 9.27% to 37.5%, which indicated that kaempferol contributed to the induction of G₂/M arrest. Kaempferol also induced apoptosis and DNA damage in MDA-MB-231 cells. Kaempferol increased the expression levels of H2AX, cleaved caspase 9, cleaved caspase 3, and p-ATM compared to those of the control group. Collectively, these results showed that kaempferol may be a potential drug for the effective treatment of TNBC.     

Cellular Effect of Curcumin and Citral Combination on Breast Cancer Cells: Induction of Apoptosis and Cell Cycle Arrest

Purpose

The unmanageable side effects caused by current chemotherapy regimens to treat cancer are an unresolved problem. Although many phytonutrients are useful as chemoprevention without side effects, their effects are slower and smaller than conventional chemotherapy. In the present work, we examined the cumulative effect of two phytonutrients, curcumin and citral, on breast cancer cell lines and compared their effect with the known chemotherapy regimen of cyclophosphamide, methotrexate, and 5-fluorouracil.

Methods

Using cultured breast cancer and normal epithelial cells, the cytotoxic and apoptotic effect of curcumin and citral was evaluated in vitro. The synergistic effect of curcumin and citral was calculated by a combination index study using the method by Chou and Talalay. Cell death pathways and mechanisms were analyzed by measuring intracellular reactive oxygen species (ROS) and apoptotic protein levels.

Results

Curcumin and citral caused dose and time dependent cell death and showed a synergistic effect at effective concentration EC₅₀ and above concentrations in breast cancer cells without disturbing normal breast epithelial cells. With combination curcumin and citral treatment, apoptosis induction and cell cycle arrest at G0/G1 phase in breast cancer cells were observed. Curcumin and citral generated ROS and activated p53 and poly (ADP-ribose) polymerase-1 mediated apoptotic pathways.

Conclusion

The results of this study suggest that curcumin and citral in combination may be a useful therapeutic intervention for breast cancer.     

Quercetin Effects on Cell Cycle Arrest and Apoptosis and Doxorubicin Activity in T47D Cancer Stem Cells

Backgrounds: Targeting breast cancer stem cells with the CD44+/CD24- phenotype is critical for complete eradication of cancer cells due to its Self-renewal, differentiation, and therapeutic resistance ability. Quercetin is a popular flavonoid with lower adverse effects and has anti-tumor properties. Therefore, we assessed the anticancer activity of Quercetin and Doxorubicin alone and in combination in the T47D cells of human breast cancer and their isolated Cancer stem cells (CSCs). Materials and Methods: The human breast cancer cell line T47D was used for this experiment. T47D CSCs were isolated by magnetic bead sorting using the MACS system. The anticancer activity of Quercetin and Doxorubicin alone and in combination were evaluated using MTT cytotoxicity assay and cell cycle distribution and apoptosis induction by flow cytometry analysis. Results: We have shown that almost 1% of T47D cell populations are made up of CD44+/CD24- cells, which considered as cancer stem cells. Quercetin and Doxorubicin alone or in combination inhibited cell proliferation and induced apoptosis in breast cancer T47D cells and in lower extent in CD44+/CD24- cells. Quercetin significantly strengthened Doxorubicin’s cytotoxicity and apoptosis induction in both cell populations. Quercetin and Doxorubicin and their combination induced G2/M arrest in the T47D cells and to a lesser extent in isolated CSCs. A value of p < 0.05 was considered as indicating a statistically significant difference. Conclusion: These outcomes suggested that CSCs are a minor population of cancer cells, which play a significant role in drug resistance by being quiescent, slow cycling and resistance to apoptosis. Furthermore, our data showed that adding Quercetin to Doxorubicin is an effective approach for the treatment of both CSCs and bulk tumor cells.     

Coordinate Involvement of Cell Cycle Arrest and Apoptosis Strengthen the Effect of FTY720

A novel reagent, FTY720 (2-amino-2-[2-(4-octylphenyl)ethyl]-l,3-propanediol hydrochloride), has been shown to induce a significant decrease of lymphocytes and lymphoma cells and is expected to be a potent immunosuppressant and anti-tumor drug. The decrease in lymphocytes and lymphoma cells is mainly the result of FTY720-induced apoptosis. FTY720 directly affects mitochondria and induces cell death. Moreover, FTY720 activates protein phosphatase (PP) 2A and affects anti-apo-ptotic intracellular signal transduction proteins to attenuate the anti-apoptotic effect. In this study, we examined the relationship between FTY720-induced apoptosis and cell cycle regulation. FTY720 induced apoptosis significantly at the GO/G1 phase and caused GO/G1 cell cycle arrest of the human lymphoma cell lines HL-60RG and Jurkat. Simultaneously, retinoblastoma protein (pRB) was dephosphorylated, suggesting that dephosphorylation of pRB was related to FTY720-induced GO/G1 cell cycle arrest. Because this dephosphorylation was completely blocked by a specific PP1/ 2A inhibitor, okadaic acid, it appears that FTY720-activated PP2A is essential for FTY720-induced cell cycle arrest. FTY720-induced apoptosis was inhibited by Bcl-2 overexpression in Jurkat cells, but this did not prevent FTY720-induced cell cycle arrest, suggesting that the mechanism of FTY720-induced cell cycle arrest is independent of the mechanism of FTY720-induced apoptosis. These two independent pathways strengthen the effect of FTY720.     

MDM2抑制剂RG-7388诱导弥漫性大B淋巴瘤细胞凋亡和周期阻滞

目的 探讨MDM2抑制剂RG-7388对弥漫性大B淋巴瘤(DLBCL)细胞增殖、细胞周期和凋亡的影响。方法 用2、4和8μmol/L RG7388处理DLBCL细胞株SUDHL2和HBL1,CCK8法和EdU法检测细胞增殖,Annexin V-FITC/PI双染和Caspase 3/7-Glo^TM酶活法检测细胞凋亡,流式细胞术检测细胞周期,蛋白质印迹法检测细胞周期和凋亡相关蛋白表达变化。结果 RG7388抑制SUDHL2和HBL1细胞的IC₅₀分别为3.36和3.76μmol/L,且RG7388的抑制作用呈剂量依赖性。不同浓度RG7388处理SUDHL2和HBL1细胞,G₁期细胞和凋亡细胞比例均显著高于对照组(均P<0.05)。随着RG7388浓度增高,Caspase 3/7酶活性逐渐增加,p53、p27、p21、PARP表达增加,Mcl-1和Bcl-x_L表达下调(均P<0.05)。结论 MDM2抑制剂RG7388抑制DLBCL细胞增殖,通过p53通路引起G₁期细胞...     

Induction of Apoptosis and Cell Cycle Arrest by Dorema Glabrum Root Extracts in a Gastric Adenocarcinoma (AGS) Cell Line

Objective: Dorema glabrum Fisch. & C.A. Mey is a perennial plant that has several curative properties. Anti-proliferative activity of seeds of this plant has been demonstrated in a mouse fibrosarcoma cell line. The aim of the present study was to evaluate cytotoxicity of D. glabrum root extracts in a human gastric adenocarcinoma (AGS) cell line and explore mechanisms of apoptosis induction, cell cycle arrest and altered gene expression in cancer cells. Materials and Methods: The MTT assay was used to evaluate IC50 values, EB/AO staining to analyze the mode of cell death, and flow cytometry to assess the cell cycle. Quantitative real-time polymerase chain reaction (qRT-PCR) amplification was performed with apoptosis and cell cycle-related gene primers, for cyclin D1, c-myc, survivin, VEGF, Bcl-2, Bax, and caspase-3 to determine alteration of gene expression. Results: Our results showed that n-hexane and chloroform extracts had greatest toxic effects on gastric cancer cells with IC50 values of 6.4 μg/ml and 4.6 μg/ml, respectively, after 72 h. Cell cycle analysis revealed that the population of treated cells in the G1 phase was increased in comparison to controls. Cellular morphological changes indicated induction of apoptosis. In addition, mRNA expression levels of Bax and caspase-3 were increased, and of bcl-2 survivin, VEGF, c-myc and cyclin D1 were decreased. Conclusion: Our study results suggest that D. glabrum has cytotoxic effects on AGS cells, characterized by enhanced apoptosis, reduced cell viability and arrest of cell cycling.     

Quercetin Induces Cell Cycle Arrest and Apoptosis in YD10B and YD38 Oral Squamous Cell Carcinoma Cells

Objective: Oral squamous cell carcinoma (OSCC) exhibits the highest lethality among head and neck cancers. Treatment for OSCC is limited due to diverse side effects. Quercetin is a natural flavonoid compound found in many kinds of plants and foods. Quercetin has been reported to be a modulator of proliferation and survival in various types of cancers due to its cytotoxic effects. We aimed to investigating chemopreventative roles of quercetin in YD10B and YD38 OSCC cells. Methods: For our study, two different types of OSCC cells were used. YD10B cells are tongue SCC cells with the p53 mutation and YD38 cells are lower gingiva SCC cells without the p53 mutation, respectively. The anticancer effects of quercetin were examined by cell viability, cell cycle, annexin-PI staining, and western blot. Result: Our results showed that quercetin decreased cell viability and induced G1 cell cycle arrest in YD10B and YD38 OSCC cells. Moreover, quercetin remarkably decreased the expression of cell cycle upregulating proteins and increased the expression of a CDK inhibitor. Quercetin also significantly increased the number of annexin-V-positive cells in a dose-dependent manner in both types of OSCC cells. This apoptotic potential of quercetin triggered cleavage of PARP followed by activation of p38 MAPK signaling pathway. Conclusion: In conclusion, this study demonstrates that quercetin shows different anti-cancer responses in OSCC with and without p53 mutation, respectively. Despite different p53 status in OSCC cells, quercetin led to apoptotic signals in both cells. Quercetin repressed cell proliferation with G1 cell cycle arrest and apoptosis by activating the p38 signaling pathway in two OSCC cells with different p53 status. These findings might provide new strategy for OSCC therapy by quercetin.     

塞来昔布诱导Ls174结肠腺癌细胞周期阻滞和凋亡

目的：观察选择性COX-2抑制剂塞来昔布（Celecoxib）诱导结肠腺癌细胞株Ls174凋亡的作用及机制。方法：采用MTT法检测塞来昔布对Ls174细胞的增殖抑制作用，应用流式细胞仪检测塞来昔布对Ls174细胞凋亡和增殖周期的影响．并检测塞来昔布对Ls174细胞Caspase-3活性的影响。结果：塞来昔布抑制Ls174细胞增殖和诱导Ls174细胞的凋亡作用均呈剂量和时间依赖性，塞来昔布处理后的Ls174细胞G0／G1期百分比与对照组相比明显增高。塞来昔布能诱导Ls174细胞Caspase-3活性，并呈浓度和时间依赖性。结论：塞来昔布在体外能抑制Ls174细胞的增殖。诱导细胞凋亡，其作用与促进Caspase-3活性和阻滞细胞周期于G0／G1期有关。     

节拍器化疗对鼻咽癌CNE-1细胞周期和凋亡的影响

目的探讨顺铂节拍器化疗对人鼻咽癌细胞CNE-1细胞周期和细胞凋亡的影响。方法采用MTT方法,检测顺铂对鼻咽癌细胞株CNE-1的半抑制浓度（IC50）,相当于临床中采用6 mg/m^2顺铂小剂量连续化疗的血浆浓度。以低于此浓度的0.10μg/ml作为顺铂节拍器体外化疗参考剂量,采用流式细胞术检测0.10μg/ml顺铂连续作用12 h和96 h细胞周期和细胞凋亡的变化情况。结果MTT法检测顺铂半抑制浓度IC50为0.19μg/ml,0.10μg/ml顺铂作用12 h后检测细胞周期变化,与对照组比较无显著变化;而作用96 h后与对照组相比进入G2/M期细胞比例显著增多,两者差异有统计学意义（P〈0.05）,但作用12 h和96 h后均未检测到明显细胞凋亡现象。结论采用小剂量顺铂作用足够长时间,可以诱导鼻咽癌CNE-1细胞周期发生变化,但是并不能诱导细胞凋亡。细胞周期同步化于G2/M期,为节拍器化疗与放疗的联用提供了可能。     

Luteolin Arrests Cell Cycling,Induces Apoptosis and Inhibits the JAK/STAT3 Pathway in Human Cholangiocarcinoma Cells

Cholangiocarcinoma (CCA) is one of the aggressive cancers with a very poor prognosis. Several efforts have been made to identify and develop new agents for prevention and treatment of this deadly disease. In the present study, we examined the anticancer effect of luteolin on human CCA, KKU-M156 cells. Sulforhodamine B assays showed that luteolin had potent cytotoxicity on CCA cells with IC50 values of 10.5±5.0 and 8.7±3.5 μM at 24 and 48 h, respectively. Treatment with luteolin also caused a concentration-dependent decline in colony forming ability. Consistent with growth inhibitory effects, luteolin arrested cell cycle progression at the G2/M phase in a dose-dependent manner as assessed by flow cytometry analysis. Protein expression of cyclin A and Cdc25A wasdown-regulated after luteolin treatment, supporting the arrest of cells at the G2/M boundary. Besides evident G2/M arrest, luteolin induced apoptosis of KKU-M156 cells, demonstrated by a distinct sub-G1 apoptotic peak and fluorescent dye staining. A decrease in the level of anti-apoptotic Bcl-2 protein was implicated in luteolininduced apoptosis. We further investigated the effect of luteolin on JAK/STAT3, which is an important pathway involved in the development of CCA. The results showed that interleukin-6 (IL-6)-induced JAK/STAT3 activationin KKU-M156 cells was suppressed by treatment with luteolin. Treatment with a specific JAK inhibitor, AG490, and luteolin diminished IL-6-stimulated CCA cell migration as assessed by wound healing assay. These data revealed anticancer activity of luteolin against CCA so the agent might have potential for CCA prevention and therapy.     

土贝母苷甲对人HL-60髓性白血病细胞周期与凋亡的影响

目的:研究土贝母苷甲(下称苷甲)对人髓性白血病细胞HL-60的细胞周期及凋亡的影响。方法:采用MTT(四甲基偶氮唑蓝)法检测苷甲对HL-60细胞生长的影响;形态学方法(荧光显微镜和透射电镜)、流式细胞仪和DNA琼脂糖凝胶电泳观察和分析在苷甲作用下HL-60细胞形态、DNA含量的变化和DNA断裂的情况;蛋白印迹免疫法检测细胞凋亡及周期相关基因bcl-2、cyclinB1表达的变化。结果:苷甲显著抑制HL-60细胞的生长,其抑制效果与浓度及时间呈依赖关系。15μmol·L-1苷甲作用24小时可将HL-60细胞阻滞于G2/M期,进而诱导其凋亡,凋亡细胞具有典型的凋亡形态特征,琼脂糖凝胶电泳可见明显的梯状区带。bcl-2表达无明显变化,cyclinB1表达降低。结论:苷甲对细胞周期起阻滞作用,并诱导其凋亡,其作用机制可能与cyclinB1表达降低有关。     

DON 对胃癌细胞HGC-27 细胞周期和凋亡的影响

 目的 探讨脱氧雪腐镰刀菌烯醇（DON）对体外培养胃癌细胞HGC-27细胞周期和凋亡的影响。方法 体外培养的胃癌细胞HGC-27经50、100、1000、2000μg／L DON处理12h、24h、48h，应用流式细胞术（FCM）进行细胞周期分析，检测凋亡情况及其量效关系，Western blot检测凋亡相关蛋白Bax、Bcl-2和Caspase-3的表达情况。结果 FCM检测结果表明，较高浓度（1000和2000μg／L）DON处理对细胞周期分布的影响随处理时间不同有明显差异。DON处理12h，可明显降低G0／G1细胞百分率、增加S期细胞百分率。处理时间延长至24h和48h，则表现为G0／G1细胞百分率增加，S期细胞百分率降低（P〈0．05）。DON处理24h和48h，各DON实验组HGC-27细胞凋亡率均高于对照组，在50～2000ug／L浓度范围内，凋亡率随着DON处理浓度的升高而升高。Western blot检测凋亡相关蛋白结果显示，DoN处理12、24和48h，Bax和Caspase-3蛋白表达均明显升高，而Bcl-2蛋白表达降低。结论 DON处理可影响体外培养的胃癌细胞象HGC-27细胞的细胞周期分布，其作用依DON浓度和作用时间的不同而有差异。同时DON可诱导HGC-27细胞凋亡，上调Bax和Caspase-3蛋白表达和下调Bcl-2蛋白表达可能是其诱导细胞凋亡的机制之一。     

细胞同步化对肿瘤坏死因子诱导Hela细胞凋亡的影响

目的 研究细胞周期时相对肿瘤坏死因子（TNF）诱导Hela细胞凋亡的影响。方法 应用胸腺嘧啶核苷（TdR）双阻断法将培养的Hela细胞同步化,采用MTT法、流式细胞术和荧光染色,分析同步化的Hela细胞和正常培养的Hela细胞对TNF（加放线菌酮增效）诱导凋亡的敏感性。结果 同步化Hela细胞较正常培养的Hela细胞对TNF诱导调亡的敏感性增强。结论 TNF诱导Hela细胞凋亡与细胞周期有关。     

替尼泊甙对胃癌细胞凋亡及细胞周期的影响

 目的 探讨替尼泊甙体外对胃癌细胞BGC-823的作用机制。方法 体外培养胃癌细胞株BGC-823,通过MTT法,流式细胞仪,观察替尼泊甙对胃癌细胞的生长抑制作用以及对细胞凋亡,细胞周期的影响。结果 在一定浓度范围内,细胞的生长抑制率随着浓度的增加而增加,细胞的凋亡率随着时间的增加而增加,细胞周期被阻滞在G2/M期,在48小时达到高峰。结论 替尼泊甙可抑制胃癌细胞的生长,诱导细胞的凋亡,其诱导凋亡的能力可能是通过把细胞阻滞在G2/M期实现的。