Inhibitory Effect of Curcumin on Proliferation of Human Pterygium Fibroblasts

In order to investigate the effect of curcumin on proliferation and apoptosis of human pterygium fibroblasts (HPF) in culture and search for a new method to prevent the recurrence after pterygium surgery, HPF was incubated with 0-160 μmol/L curcumin for 24-96 h. The MTT method was used to assay the biologic activities of curcumin at different time points and different doses. The expression of proliferating cell nuclear antigen (PCNA) in each group was detected by immunohistochemistry. The cell cycle distribution was detected by flow cytometry (FCM). Admini- stration of 20-80 μmol/L curcumin for 24-72 h could significantly inhibit HPF proliferation in a dose- and time-dependent manner (P<0.05). After treatment with curcumin at different concentrations of 20, 40, 80 and 160 μmol/L for 24 h, FCM revealed there was a significant sub-G1 peak at each concentration. The number of HPF in G0/G1 phase was increased, while in S phase, it was decreased (P<0.05). At the concentration of 20-80 μmol/L, curcumin, in a dose-dependent manner (P<0.05), could inhibit the expression of PCNA in HPF. It was suggesterd that curcumin could significantly in- hibit the proliferation of HPF, make HPF arrest in G0/G1 phase and induce the apoptosis of HPF in a dose- and time-dependent manner.     

Anticancer Effect of Curcumin on Human B Cell non-Hodgkin＇s Lymphoma

Curcumin(diferuloylmethane)isayellowpig mentfromtherhizomesofturmeric(Curcumalon gaL.)andisamajorcomponentofvariousrecipesforcurry.Curcuminhasbeenreportedtohaveanumberofpharmacologicaleffectsincludinganti inflammatory,anti oxidant,antiviral,antibacterialandantitumoreffects,whichisattractingmoreandmoreattentionofinvestigators.Curcuminhasin hibitoryeffectsonmanytumorssuchasfoestom achcancer,esophagealcancer,coloncancer,livercancer,mammarytumor,bladdercancer,skincanceraswellasDMBA inducedleukem…     

虫草素对人骨肉瘤MG-63细胞凋亡的影响及其机制研究

目的 研究虫草素对人骨肉瘤MG-63细胞凋亡的影响及其机制。方法 采用CCK-8实验检测不同浓度虫草素作用于MG-63骨肉瘤细胞24h和48h后对癌细胞增殖的抑制作用;采用流式细胞术分析虫草素对MG-63细胞周期分布及凋亡的影响;采用Western blot法检测虫草素对MG-63细胞凋亡相关蛋白Bax、Bcl-2、cleaved caspase-9、cleaved caspase-3及NICD1、Hes1蛋白表达的影响。结果 虫草素对人骨肉瘤MG-63细胞有明显的增殖抑制作用,导致MG-63细胞周期阻滞于G₀/G₁期并诱导细胞凋亡;虫草素可上调Bax、cleaved caspase-9和cleaved caspase-3蛋白的表达并下调Bcl-2,NICD1和Hes1蛋白的表达。结论 虫草素通过抑制骨肉瘤细胞增殖,诱导细胞周期阻滞于G₀/G₁期并通过线粒体凋亡途径诱导MG-63细胞凋亡从而发挥抗骨肉瘤作用,可能骨肉瘤细胞中Notch信号通路活性下调有关。     

AMPK激动剂AICAR通过阻滞细胞周期于G0/G1期抑制肺动脉平滑肌细胞增殖

目的 建立PDGF-BB诱导的原代大鼠肺动脉平滑肌细胞(pulmonary vascular smooth muscle cells,PASMCs)的增殖细胞模型,通过AMPK激动剂AICAR干预,探讨AICAR对PASMCs细胞周期和增殖的影响及其机制,为肺血管重构防治寻找靶点。方法 通过20ng/ml PDGF-BB刺激诱导PASMCs增殖建立细胞模型,采用AICAR(0.5mmol/L)干预PDGF-BB诱导的PASMCs增殖,Western blot法检测总的和磷酸化的AMPK, CCK-8检测PASMCs增殖,流式细胞仪分析细胞周期,实时定量PCR(RT-PCR)检测cyclinD1、cyclinE、CDK2/4/6 mRNA的表达。结果 Western blot法检测表明AICAR可以活化AMPK,CCK-8检测结果表明AICAR能够抑制PDGF-BB诱导的PASMCs增殖;流式细胞仪检测结果表明AICAR能够抑制细胞周期于G₀/G₁期,RT-PCR结果表明AICAR可以抑制cyclinD1、cyclinE、CDK2、CDK4和CDK6的mRNA的表达。结论 AICAR通过抑制cyclinD1、cyclinE、CDK2/4/6 的mRNA表达阻滞细胞周期于G₀/G₁~S期,抑制PASMCs增殖。     

Adenovirus-mediated PTEN gene transfection suppresses growth and promotes chemosensitivity of endometrial carcinoma

Objective： To determine the potential of sustained transgene expression by intratumoral injection of Ad-PTEN in the nude mouse model of endometrial carcinoma. Methods and Results： We constructed recombinant adenovirus carrying the wild-type PTEN gene （Ad-PTEN）. RL95-2 cells, an endometrial carcinoma cell line lacking PTEN function, was infected with Ad-PTEN and showed increased expression of PTEN and chemosensitivity to doxorubicin, decreased proliferation rate, and elevated apoptosis and Go/G1 arrest. Furthermore, the tumorigenicity of these cells was also completely suppressed. These results indicated that gene therapy with Ad-PTEN could significantly inhibit the endometrial carcinoma xenografts growth in nude mice by intratumoral injection, induce apoptosis of tumor cells, and reduce expression of proliferating cell nuclear antigen （PCNA）. Immunohistochemistry analysis also showed that the expression of progesterone receptors （PR） in Ad-PTEN treated tumor cells were induced, while P-glycoproteins （P-gp） and estrogen receptors （ER） decreased significantly. Conclusion： PTEN may play an important role in the development of endometrial carcinoma. Our findings cast new lights for treatment ofendometrial carcinoma.     

Differential Responses to UVB Irradiation in Human Keratinocytes and Epidermoid Carcinoma Cells

ObjectiveTo examine UVB-induced responses in normal human keratinocytes (HaCaT) and epidermoid carcinoma cells (A431) at the cellular and molecular level, and investigated the protective effect of salidroside.MethodsCells irradiated by UVB at various dosage and their viability was assessed by MTT assays, cell cycle was analysed by flow cytometry. The expression of NF-κB, BCL-2, and CDK6 after 50 J/m² UVB irradiation were detected by RT-PCR and western blotting.ResultsOur results confirmed greater tolerance of A341 cells to UVB-induced damage such as cell viability and cell cycle arrest, which was accompanied by differential expression changes in NF-κB, BCL-2, and CDK6. UVB exposure resulted in HaCaT cells undergoing G₁-S phase arrest. When treated with salidroside, HaCaT survival was significantly enhanced following exposure to UVB, suggesting great therapeutic potential for this compound.ConclusionTaken together, our study suggests that A431 respond differently to UVB than normal HaCaT cells, and supports a role for NF-κB, CDK6, and BCL-2 in UVB-induced cell G₁-S phase arrest. Furthermore, salidroside can effectively protect HaCaT from UVB irradiation.     

Effects of betulinic acid on proliferation and apoptosis in Jurkat cells and its in vitro mechanism

Summary  The anti-cancer effects of betulinic acid (BA) on Jurkat cells and its in vitro mechanism were examined by using MTT assay. Apoptosis was detected by using Hoechst33258 staining and annexin-V/PI double-labeled cytometry. The effects of betulinic acid on the cell cycle of Jurkat cells were studied by propidium iodide method. RT-PCR and Western blotting were used to analyze the changes of cyclin D3, bcl-xl mRNA and protein levels in Jurkat cells after treatment with betulinic acid. Our results showed the proliferation of Jurkat cells was decreased in betulinic acid-treated group with a 24-h IC50 value being 70.00 μmol/L. Betulinic acid induced apoptosis of Jurkat cells in a time- and dose-dependent manner. The number of Jurkat cells treated with betulinic acid showed an increase in G₀/G₁ phase and decrease in S phase. After treatment with 0, 20, 60, 100 μmol/L betulinic acid for 24 h, the number of Jurkat cells was increased from (31.00±1.25)% to (58.84±0.32)% in G₀/G₁ phase, whereas it was decreased from (61.45±1.04)% to (35.82±1.95)% in S phase. PBMCs were less sensitive to the cytotoxicity of betulinic acid than Jurkat cells. The expressions of cyclin D3, bcl-xl mRNA and protein were decreased sharply in Jurkat cells treated with betulinic acid. It is concluded that betulinic acid is able to inhibit the proliferation of Jurkat cells by regulating the cell cycle, arrest cells at G₀/G₁ phase and induce the cell apoptosis. The anti-tumor effects of betulinic acid are related to the down-regulated expression of cyclin D3 and bcl-xl. Zi CHEN, Female, born in 1980, Resident This project was supported by a grant from the National Natural Sciences Foundation of China (No. 30500686).     

姜黄素通过Wnt/β-catenin信号通路诱导人晶状体上皮细胞的凋亡和细胞周期阻滞

目的 探讨姜黄素对人晶状体上皮细胞株SRA01/04（HLEC-SRA01/04）细胞周期和凋亡的影响及其相关分子机制,为姜黄素治疗和预防后发性白内障提供理论依据。方法 体外培养HLEC-SRA01/04细胞,加入终浓度分别为0 μmol/L（对照组）以 及20、40和60 μmol/L的姜黄素处理孵育24 h或48 h后,MTT法检测各组细胞的增殖抑制率;流式细胞仪检测HLEC-SRA01/04细胞周期、线粒体膜电位和细胞凋亡率;Western blot法检测姜黄素对HLEC-SRA01/04细胞中caspase-9、caspase-3、Bcl-2、Bax、Cyclin B1、CDK1、β-catenin、c-myc、Cyclin D1蛋白水平表达的影响。结果 MTT显示：随着姜黄素的浓度逐渐增加,HLEC-SRA01/04细胞较对照组抑制率逐渐增高（P<0.001）;随着作用时间的延长,各实验组HLEC-SRA01/04细胞增殖抑制率均逐渐增高（P<0.001）;流式细胞仪结果显示：各组中HLEC-SRA01/04细胞凋亡率和细胞G2/M期比例随姜黄素浓度增加逐渐增高,而线粒体膜电位随着姜黄素浓度增加逐渐下降（P<0.001）。Western blot 实验显示：随着姜黄素浓度的增加,HLEC- SRA01/04细胞中caspase-3、caspase-9和Bax的表达量逐渐增高,Bcl-2、Cyclin B1、CDK1和β-catenin的表达量逐渐降低,同时Wnt/β-catenin信号通路下游靶蛋白Cyclin D1和c-myc表达量也逐渐降低。结论 姜黄素可能通过抑制Wnt/β-catenin信号通路进而抑制HLEC-SRA01/04细胞增殖,并将细胞周期阻滞在G2/M期,从而诱导其凋亡。     

Inhibitory effect of PPARγ agonist on the proliferation of human pterygium fibroblasts

The effects of DK2,a peroxisome proliferator-activated receptor γ agonist,on cultured human pterygium fibroblasts (HPFs) in virto were studied.The HPFs were incubated with 0-200 μmol/L DK2 for 12-72 h.The MTT method was used to assay the bio-activity of DK2 at different doses and time.The cytotoxic effect of DK2 was measured by LDH release assay.The cell cycle distribution and apoptosis were flow cytometrically detected.The expression of proliferating cell nuclear antigen (PCNA) in each group was detected by real-time PCR (RT-PCR) and Western blotting.The results showed that administration of 1-75 μmol/L DK2 for 12-72 h could significantly inhibit HPF proliferation in a dose-and time-dependent manner.DK2-treated cells did not release significant amount of LDH as compared with rosiglitazone-treated cells.After treatment with DK2 at concentrations of 15,25 μmol/L for 24 h,the number of HPFs in G 0 /G 1 phase was significantly increased while that in S phase was significantly decreased (P<0.05),leading to arrest at G 0 /G 1 phase.The apoptosis rates of HPF cells in drug-treated groups were significantly higher than the rate of control group (P<0.05).At the dosage range between 15-25 μmol/L,DK2 could inhibit the expression of PCNA mRNA and protein in HPFs in a dose-dependent fashion (P<0.05).It was concluded that PPARγ agonist can significantly inhibit HPF proliferation,resulting in the arrest at G 0 /G 1 phase,induce the apoptosis of HPFs,and suppress the synthesis of PCNA,in dose-and time-dependent manners.     

Effects of anti-CXCR4 monoclonal antibody 12G5 on proliferation and apoptosis of human acute myelocytic leukemia cell line HL-60

Objective:To investigate the expression of CXCR, on HL-60 cell line and the proliferation, apoptosis of HL-60 cell line cocultured with bone marrow stromal cells, so as to assess the possibility of 12G5. an anti-CXCR4 monoclonal antibody, in eradicating the minimal residual disease. Methods:The activity of SDF-1 was inhibited by 10μg/ml 12G5. After treatment with 12G5. the status of adhesion was observed, and the adhesion rates, apoptosis and cell cycles were detected after 24 h of treatment. Cell growth rates were measured by trypan blue exclusion. Cell growth curve was plotted, and the expression of PCNA and apoptosis related protein including PCNA, Bcl-2 and Fas were detected with immunohis-tochemical technique. Results :(1) There was middling degree expression of CXCR4 on HL-60 membrane. From 0 h to 6 h, as the time of 12G5 incubation along, the expression of CXCR4 decreased gradually. (2) After treatment for 24 h, the adhesion rates in the experiment group and the control were (39. 4±7. 9)% and (51. 4±5. 9)%, respectively. (3)After treatment for 24 h, the percentage of HL-60 cells in G0/G1 phase were (55. 21±4. 9)%, and that in S phase and G2/M phase were (30. 40±4. 1)% and (14. 39±5.2)%, respectively, with the corresponding proportions being (44. 67±2. 2) % , (45. 30±3. 7)% . and (10. 03±2. 6)% in the control. (4) The percentage of apoptotic HL-60 cells was (8. 95±1. 7)% in the experiment group, compared to (3. 97±2. 4)% in the control. (5)The survival rates of HL-60 cells decreased markedly at 48 h to 96 h, and the proliferation slowed down at this time duration. (6)The expression of PCNA and Bcl-2 down-regulated significantly, but the Fas protein expression was up-regulated. Conclusion :12G5 could inhibit the capability of adhesion and proliferation of HL-60 cells and it can induce more cells to enter G0/G1 phase and promote apoptosis. It may be helpful by inhibiting the bioactivity of SDF-1 with 12G5 in the therapy of marrow residual disease.     

胃祺饮乙醇提取物可诱导AGS细胞G2/M 期阻滞及凋亡

Objective:To evaluate the effects of the ethanol extract isolated from Weiqi Decoction(胃祺饮,WQD-EE)on AGS cell proliferation and apoptosis.Methods:By using high-performance liquid chromatography with ultraviolet detectors(HPLC-UV)assay and MTT method,the main compounds in WQD-EE and cell viability were detected.And cell cycle distributions were determined by flow cytometry with propidium iodine(PI)staining while apoptosis was detected by flow cytometry with annexin V/Pl double staining.Finally,caspase-3 activities were measured by calorimetric method and protein expression was determined by Western blotting.Results:HPLC analysis showed that naringin(35.92μg/mg),nobiletin(21.98μg/mg),neohesperidin(17.98μg/mg)and tangeretin(0.756μg/mg)may be the main compounds in WQD-EE.WQD-EE not only inhibited AGS and MCF7 cell proliferation in a dose-dependent manner,but also blocked cell cycle progression at G_2/M stage as well as inducing cell apoptosis at concentrations triggering significant inhibition of proliferation and cell cycle arrest in AGS cells.While at 0.5 mg/mL,WQD-EE significantly increased caspase-3 activity by 2.75 and 7.47 times at 24 h and 48 h,respectively.Moreover,WQD-EE in one hand reduced protein expressions of p53 and cyclin B1,and in other hand enhanced protein expressions of cytochrome c and Bax.Protein levels of Bcl-2,Fas L and Fas were not significantly affected by WQD-EE.Conclusions:WQD-EE inhibits AGS cell proliferation through G_2/M arrest due to down-regulation of cyclin Bi protein expression,and promotes apoptosis by caspase-3 and mitochondria-dependent pathways,but not by p53-dependent pathway.     

熊果酸对肺癌细胞株A549及SPCA1细胞周期的抑制作用

目的 研究熊果酸(ursolic acid,UA)对肺癌细胞株A549及SPCA1细胞周期的抑制作用,探讨其分子机制。方法 采用MTS法检测不同浓度UA作用不同时间对A549及SPCA1细胞的增殖抑制作用;光镜下观察细胞形态学变化;流式细胞仪检测不同浓度UA对A549及SPCA1细胞周期分布的影响;实时荧光定量PCR分析UA作用下A549及SPCA1的相关分子表达情况。结果 MTS结果显示UA对A549及SPCA1细胞具有增殖抑制作用,且呈时间和剂量依赖性。经UA作用后,光镜下可见A549及SPCA1细胞增殖受到抑制,细胞出现变圆、回缩和脱落。流式细胞仪结果显示在UA作用后,A549及SPCA1细胞周期抑制在G₀/G₁期,S期和G₂/M期的比例降低。实时荧光定量PCR结果表明,UA作用后A549及SPCA1细胞cyclinD1 mRNA、cyclinE mRNA、Ankrd17 mRNA表达水平降低,p27 mRNA、p16 mRNA表达增加,Ankrd17 mRNA表达变化差异无统计学意义。结论 UA能明显抑制A549及SPCA1细胞增殖,呈时间和剂量依赖性,该作用是通过将细胞周期抑制在G₀/G₁期实现的。其分子机制可能与上调p27和p16的表达,下调cyclinD1和cyclinE的表达有关。     

亲环素A在胃癌细胞中的表达及与肿瘤细胞增殖的关系

目的 检测亲环素A(CypA)在胃癌组织和细胞株中的表达情况,采用基因干扰技术抑制胃癌细胞中CypA的表达,探讨CypA对胃癌细胞增殖能力的影响和相关分了机制.方法 实时定量PCR和蛋白质印迹法检测CypA在胃癌组织、癌旁组织和细胞株中的表达;合成针对CypA的靶向siRNA并转染胃癌MKN45细胞株,检测CypA-siRNA对胃癌细胞内源性CypA的抑制作用,同时设置非特异性siRNA对照组和阴性对照组.MTT法检测各组细胞增殖情况,流式细胞术检测各组细胞周期;实时定量PCR和蛋白质印迹法检测各组细胞增殖基因PCNA、P21、P16、Cyclin D1的表达.结果 胃癌组织中CypA的mRNA和蛋白表达高于癌旁组织,胃癌细胞株CypA的mRNA和蛋白表达高于胃上皮细胞株,且在低分化细胞MKN45中表达最高(P＜0.05).CypA-siRNA可有效抑制内源性CypA的表达;CypA-siRNA转染后MKN45细胞增殖能力下降(P＜0.05),G0/G1期细胞比例上升、G2/M期细胞比例下降(P＜0.05),PCNA、Cyclin D1的mRNA和蛋白表达下调,P21mRNA和蛋白表达上调(P＜0.05).结论 胃癌细胞中CypA的表达增强,CypA基因能够通过调节部分增殖基因的表达而促进胃癌细胞增殖.     

联氨基姜黄素脂质体纳米颗粒对MDA-MB-231细胞增殖、凋亡、侵袭及迁移的影响

目的 探讨联氨基姜黄素（hydrazinocurcumin,HC）脂质体纳米颗粒（NPs）对人乳腺癌细胞株MDA-MB-231增殖、凋亡、侵袭及迁移的影响。方法 通过薄膜分散-超声法制备联氨基姜黄素脂质体纳米颗粒（HC-NPs）。用HC-NPs处理细胞后,MTT法检测细胞增殖,刘氏染色法检测细胞形态学改变,流式细胞术检测细胞周期与凋亡,Transwell检测细胞的侵袭和迁移,Western blotting检测与细胞周期、凋亡、侵袭及迁移相关蛋白分子的变化。结果 HC-NPs可抑制MDA-MB-231细胞的增殖,使细胞形态变圆,诱导细胞发生G₂/M期阻滞,使细胞凋亡率明显增加（P＜0.01）,抑制细胞的侵袭和迁移。HC-NPs可下调磷酸化-信号转导和转录激活因子（p-STAT3）以及下游分子Cyclin D1、Survivin、Bcl-2及MMP-9的表达,上调Bax的表达。结论 HC-NPs可能通过抑制STAT3的激活,抑制细胞增殖、侵袭和迁移,促进细胞凋亡。     

Effect of artesunate on human endometrial carcinoma HEC-1B cells

Objective： To observe the effect of the artesunate （ART） on cellular proliferation in vitro, to search for the possible anti-tumor mechanism of ART on endometrial carcinoma at the molecular level and to provide the experimental and theoretical foundations for the clinical applications of ART. Methods： The cell proliferation was observed by microscope; MTT was used to examine the effects of ART on proliferation of HEC-1B cells, and flow cytometric analysis was used to detect cell cycle and apoptosis. The human endometrial carcinoma HEC-1B cells were conventionally cultured; ART was administered with a concentration of 40 μg/ml before the total RNA were extracted, mRNA expression of Survivin, Caspase-3, N-Cadherin, E-Cadherin, Fibronectinl and Cox-2 were detected using RT-PCR. Results： ART reduced proliferation in human endometrial carcinoma cell line HEC-1B in a dose- and time-dependent effect. The cells of G0/G1 stage were significantly increased （P〈0.05）, but the cells of G2/M stages were significantly decreased （P〈0.05）, so it has shown that the cell cycle was probably blocked in G0/G1 stage. After intervention with ART at 20 and 80 μg/ml for 48 h, cellular apoptosis rate respectively was （36.42±0.77）% and （11.77±0.58）%, and the difference was statistically significant compared with the control （[6.64±0.191%, P〈0.01）. The expression of Cox-2 mRNA in the ART group was lower than those of control group, yet the expression of Caspase-3 and E-Cadherin mRNA in the ART group was higher than those of control group. Conclusion： ART can inhibit HEC-1B cell growth and proliferation in a dose- and time-dependent manner. Furthermore, ART can induce apoptosis in a dose-dependent manner. ART is able to downregulate Cox-2 mRNA expression and to upregulate E-Cadherin and Caspase-3 mRNA expression. So we can conclude that ART could induce the endometrial carcinoma HEC-1B cell apoptosis and inhibit tumor cell proliferation.     

外源性antizyme1基因转染对SH-SY5Y细胞的生物学影响

目的 研究antizyme 1(AZl)基因对成人神经廇SH-SY5Y细胞增殖、细胞周期及凋亡的影响.方法 将构建好的AZ1基因重组真核表达载体pAZ1m稳定转染SH-SY5Y细胞.通过MTT法检测细胞增殖变化,流式细胞术分析AZ1转染对细胞周期及凋亡的影响.RT-PCR与Western blotting检测AZ1基因转染对cyclin D1和caspase-3表达的影响,caspase-3试剂盒检测酶活性变化.结果 稳定转染SH-SY5Y细胞后,检测结果显示AZ1基因转染能够减慢SH-SY5Y细胞增殖速度,并使细胞停滞于G0/G1期.在cyclin D1基因表达抑制的同时,caspase-3基因表达上调.酶活性测定显示Caspase-3活性上升.结论 AZ1基因能够抑制SH-SY5Y细胞增殖,通过降低cyclin D1的表达阻滞细胞周期于G0/G1期,并上调caspase-3表达促进SH-SY5Y细胞凋亡.     

新型靶向组蛋白去乙酰化酶抑制剂的抗肿瘤作用及其机制

探讨3种新型靶向组蛋白去乙酰化酶(HDAC)抑制剂D16,D22,D29的抗肿瘤活性作用及其抑制人宫颈癌细胞增殖的机制。MTT法检测D16,D22,D29对MCF-7、HCT-116、A549、HeLa以及K562的增殖抑制作用;测定D16,D22,D29对HDAC及其HDAC-1的酶活抑制作用;流式细胞术观察D16,D22,D29对HeLa细胞周期及凋亡诱导作用;Western blot测定D16,D22,D29对HeLa细胞中乙酰化组蛋白H3(Ac-H3),p21^cip/WAF的蛋白表达影响。结果显示,D16,D22,D29明显抑制多种肿瘤细胞株的增殖,有效抑制HDAC及其HDAC-1的活性,其效果优于阳性对照药Vorinostat(SAHA),并诱导HeLa细胞产生G₁期细胞周期阻滞及凋亡,Ac-H3及p21^cip/WAF的蛋白水平明显上升。D16,D22,D29具有一定的抗肿瘤活性,其机制与诱导细胞周期阻滞和凋亡产生,促进p21^cip/WAF的蛋白表达有关。     

黄芪注射液对乳腺癌MCF-7细胞增殖周期以及细胞凋亡、迁移影响的实验研究

目的 探讨黄芪注射液对乳腺癌MCF-7细胞增殖、周期、凋亡及迁移的影响。方法 通过MTT法观察药物处理后对乳腺癌MCF-7细胞的生长增殖情况的影响;通过流式细胞术检测黄芪注射液对乳腺癌MCF-7细胞增殖周期、凋亡的影响;利用划痕实验检测黄芪注射液对乳腺癌MCF-7细胞的迁移的影响。结果 MTT结果发现,不同浓度的黄芪注射液（100、200、400、600、800mg/ml）对乳腺癌MCF-7细胞的增殖具有不同程度的抑制作用;流式细胞术结果显示,与空白对照组相比,200和400mg/ml黄芪注射液均能导致G₁期增加,且两个浓度的凋亡率都大于空白对照组;划痕实验结果显示200和400mg/ml黄芪注射液组较空白对照组划痕愈合率低。结论 不同浓度的黄芪注射液在体外对乳腺癌MCF-7细胞增殖具有一定的抑制作用;同时可将细胞增殖周期阻滞在G₁期,促进MCF-7细胞凋亡;一定浓度的黄芪注射液对MCF-7细胞的迁移具有抑制作用,为乳腺癌的临床应用提供实验基础。     

姜黄素联合雷帕霉素诱导去势难治性前列腺癌Pten-CaP8细胞自噬及凋亡研究

目的 探讨姜黄素联合雷帕霉素对去势难治性前列腺癌（CRPC）Pten-CaP8细胞增殖、自噬及凋亡的影响。方法 将不同浓度的姜黄素单独或与雷帕霉素共同处理Pten-CaP8细胞24 h后,MTT法检测细胞增殖,光镜下观察细胞形态,Western blotting法检测相关蛋白表达。结果 姜黄素联合雷帕霉素可显著抑制Pten-CaP8细胞增殖（P＜0.05）,上调LC3-II/LC3-I表达,诱导PARP裂解,还可下调p-AKT（S473）、p-S6（S240/244）、AR（N-20）和Cyclin D1蛋白表达水平,使Pten-CaP8细胞形态变短且胞浆内出现空泡改变。结论 姜黄素联合雷帕霉素可共同诱导Pten-CaP8细胞自噬及凋亡且效果显著,两者协同抗癌机制与其拮抗PI3K/Akt/mTOR信号通路相关。     

雷公藤内酯醇对多发性骨髓瘤RPMI 8226细胞周期及P21wap1/cip1和P27kip1表达的影响

目的 观察雷公藤内酯醇对多发性骨髓瘤细胞 RPMI 8226 增殖和周期的影响,探讨细胞周期调控蛋白 P21wap1/cip1 和 P27kip1 在其中的作用和意义。方法 采用 MTT 比色法和流式细胞术检测雷公藤内酯醇对 RPMI 8226 细胞增殖、凋亡和细胞周期的影响,半定量 RT-PCR 和 Western blotting 法检测 RPMI 8226 细胞中 P21wap1/cip1、P27kip1 mRNA 和蛋白表达。结果 雷公藤内酯醇能明显抑制 RPMI 8226 细胞增殖,其抑制作用呈时间、剂量依赖性,雷公藤内酯醇作用 48 h 的 IC₅₀ 值为 (71.18±2.01) nmol/L。雷公藤内酯醇还可以诱导 RPMI 8226 细胞周期阻滞于 G₀/G₁ 期,随着雷公藤内酯醇浓度的增加,G₀/G₁ 期细胞逐渐增多,S 期细胞逐渐减少。经雷公藤内酯醇干预后周期调节蛋白 P21wap1/cip1 和 P27kip1 的 mRNA 和蛋白表达水平明显上调。结论 雷公藤内酯醇可以抑制 RPMI 8226 细胞增殖,该抑制作用是通过调控 P21wap1/cip1 和 P27kip1 的表达,从而阻止细胞周期 G₀/G₁ 期过渡实现的。