灵芝孢子油对MCF-7细胞凋亡及迁移的影响

目的：观察灵芝孢子油对人乳腺癌MCF-7细胞增殖、迁移及凋亡的影响,并探讨其可能的作用机制。方法：CCK-8法检测灵芝孢子油对MCF-7增殖的影响;伤口愈合实验观察灵芝孢子油对MCF-7细胞迁移的作用;流式细胞术检测细胞凋亡率;RT—PCR法检测抗凋亡基因Bcl-2、促凋亡基因Bax及血管内皮生长因子（VEGF）mRNA表达水平。结果：不同浓度的灵芝孢子油对MCF-7的增殖和迁移均有一定程度的抑制作用,且呈时间、剂量依赖性;灵芝孢子油能显著诱导MCF-7细胞凋亡;RT—PCR结果显示,灵芝孢子油能上调Bax同时下调Bcl-2和VEGF的mRNA表达水平。结论：灵芝孢子油能抑制人乳腺癌MCF-7细胞增殖和迁移,并促进细胞凋亡,其作用机制可能与下调VEGF和Bcl-2／Bax的比值有关。     

连翘苷对胃癌细胞AGS增殖、迁移和侵袭的抑制作用

目的 探讨连翘苷对胃癌细胞AGS增殖、迁移和侵袭的抑制作用。方法 5、10、20μmol/L连翘苷作用AGS细胞24 h后,CCK-8、Transwell法检测细胞增殖、迁移和侵袭,Western blot法检测Ki67、MMP-2、MMP-9蛋白表达,RT-qPCR法检测lncRNA EXOC7 mRNA表达。转染EXOC7表达小干扰RNA至AGS细胞,观察降低EXOC7表达对AGS细胞增殖、迁移和侵袭及Ki67、MMP-2、MMP-9蛋白表达的影响。结果 连翘苷作用于AGS细胞后,细胞增殖活力、迁移和侵袭数,Ki67、MMP-2、MMP-9蛋白,EXOC7 mRNA表达均降低(P<0.05)。抑制EXOC7表达后,AGS细胞增殖活力、迁移和侵袭数,Ki67、MMP-2、MMP-9蛋白表达均降低(P<0.05)。过表达EXOC7可以逆转连翘苷对AGS细胞增殖、迁移和侵袭及Ki67、MMP-2、MMP-9蛋白表达的影响。结论 连翘苷可能通过降低EXOC7表达抑制胃癌细胞AGS增殖、迁移和侵袭。     

槐耳板蓝根双向发酵提取物抑制乳腺癌MCF-7细胞迁移/侵袭及相关因子的研究

目的观察槐耳板蓝根双向发酵产物对乳腺癌MCF-7细胞迁移、侵袭和相关因子的影响,探讨其相关机制。方法以人乳腺癌MCF-7细胞为模型,实验分为对照组、板蓝根组、槐耳组和槐耳板蓝根组。MTT法检测细胞增殖;细胞划痕实验检测MCF-7细胞迁移能力;Transwell细胞侵袭实验检测MCF-7细胞侵袭能力;细胞黏附实验检测MCF-7细胞黏附能力;半定量RT-PCR检测MCF-7细胞基质金属蛋白酶(MMP-9)和波形蛋白(Vimentin)基因表达。结果与板蓝根组和槐耳组比较,槐耳板蓝根组明显抑制MCF-7细胞增殖、迁移、侵袭和黏附(P0.05),抑制MMP-9和Vimentin的基因表达(P0.05)。结论槐耳板蓝根双向发酵提取物可能通过下调MMP-9和Vimentin的基因表达抑制乳腺癌MCF-7细胞迁移、侵袭。     

人参皂苷CK抑制乳腺癌MCF-7细胞迁移和侵袭的实验研究

目的探讨人参皂苷CK对乳腺癌MCF-7细胞迁移和侵袭的影响及潜在机制。方法体外培养MCF-7细胞,分别通过四甲基噻唑蓝(MTT)法、划痕实验、Transwell侵袭实验及蛋白免疫印迹(Western blot)法检测不同浓度的人参皂苷CK对MCF-7细胞活力、迁移能力、侵袭能力及基质金属蛋白酶-2(MMP-2)、MMP-9表达的影响。结果人参皂苷CK可剂量依赖性的抑制MCF-7细胞的增殖;与对照组相比,人参皂苷CK 5,10μmol/L组的细胞迁移能力及2.5,5,10μmol/L组的细胞侵袭能力呈显著性降低(P0.05);与对照组相比,人参皂苷CK 2.5,5,10μmol/L剂量组的MMP-2及5,10μmol/L剂量组的MMP-9表达呈显著性降低(P0.05)。结论人参皂苷CK具有抑制乳腺癌MCF-7细胞迁移和侵袭的作用,该作用与MMP-2及MMP-9的表达减少有关。     

百合总皂苷对肺癌细胞增殖、凋亡及侵袭转移的作用及其初步机制研究

该文探讨百合总皂苷(TSLL)对人肺癌A549细胞增殖、凋亡、迁移及侵袭的潜在作用及其可能机制。采用CCK-8法、克隆形成实验及Ed U染色检测TSLL对A549细胞增殖的影响,Annexin V/PI双染法和Hoechst 33342染色法荧光显微镜观察TSLL对细胞凋亡形态的影响,Transwell迁移实验和Transwell侵袭实验分别检测TSLL对细胞迁移、侵袭的影响,Western blot法检测TSLL对肿瘤细胞内相关蛋白的表达变化。结果显示,TSLL干预肺癌A549细胞24,48或72 h均可显著抑制细胞生长,其IC50分别约为229,173,71 mg·L~(-1); TSLL可显著降低A549细胞克隆形成率; TSLL可浓度依赖性地降低A549细胞DNA合成率; TSLL可明显诱导A549细胞凋亡; TSLL可减少A549细胞迁移行为; TSLL可减少A549细胞侵袭人工基底膜;TSLL可显著下调肺癌A549细胞内PCNA蛋白的表达水平以及Bcl-2/Bax蛋白表达水平比值,同时促进procaspase 3的激活,此外TSLL对EMT相关标志蛋白E-cadherin,vimentin的表达均无明显的影响。以上结果表明TSLL对肺癌A549细胞增殖、迁移及侵袭具有抑制作用,并且对细胞凋亡具有诱导作用。TSLL可通过下调PCNA的表达抑制肺癌细胞DNA合成,从而抑制细胞增殖。TSLL对肺癌细胞凋亡的诱导作用与其对Bcl-2,Bax蛋白的表达调控有关。此外,TSLL抗肺癌细胞侵袭转移作用与EMT无明显的关联性。     

中药QHF复方抑制乳腺癌MCF-7细胞增殖、迁移、侵袭的机制研究

摘要：目的 研究中药QHF复方对乳腺癌MCF-7细胞增殖、迁移、侵袭的影响及其可能的作用机制,为QHF的临床应用提供理论依据。方法 体外培养人乳腺癌MCF-7细胞,以对数生长期的细胞为研究对象,予以不同浓度QHF复方及其他药物,CCK8法检测QHF复方对乳腺癌MCF-7细胞生长增殖的影响。细胞划痕实验和Transwell实验检测QHF复方对乳腺癌MCF-7细胞迁移、侵袭的影响。Western blot检测QHF复方对乳腺癌MCF-7细胞HGF/c-Met及其下游PI3K/Akt、MAPK/ERK信号通路的影响。结果 CCK8实验结果显示：中药QHF复方可不同程度抑制乳腺癌MCF-7细胞增殖且这种抑制作用可显著拮抗HGF对乳腺癌MCF-7细胞增殖的促进作用。细胞划痕实验和Transwell实验结果显示：中药QHF复方能明显抑制MCF-7细胞迁移、侵袭且这种抑制作用可拮抗HGF 对MCF-7细胞迁移、侵袭的促进作用。Western blot实验结果显示：中药QHF复方可明显抑制乳腺癌MCF-7细胞HGF、p-c-Met、p-Akt、p-ERK、VEGF、MMP-2、MMP-9的表达。结论 中药QHF复方抑制乳腺癌MCF-7细胞的增殖、迁移和侵袭的机制可能与抑制乳腺癌MCF-7细胞异常活化的HGF/c-Met及其下游PI3K/Akt、MAPK/ERK信号通路有关。     

六氧化四砷对乳腺癌MCF-7细胞增殖、迁移及侵袭能力的影响

目的观察六氧化四砷(As_4O_6)对人乳腺癌MCF-7细胞增殖、迁移及侵袭能力的影响,探讨其作用机制。方法体外培养人乳腺癌MCF-7细胞,不同浓度As_4O_6对细胞进行干预。MTT法检测细胞增殖,流式细胞术检测细胞凋亡,划痕愈合实验检测细胞迁移能力,半定量RT-PCR检测细胞周期蛋白E1(Cyclin E1)、细胞周期蛋白A2(Cyclin A2)、半胱氨酸天冬氨酸蛋白酶-3(Caspase-3)、p21和基质金属蛋白酶-9(MMP-9)m RNA表达情况。结果 As_4O_6对MCF-7细胞增殖有明显抑制作用,且呈剂量依赖性(P0.01);与对照组(0μmol/L)比较,As_4O_6浓度为9、12、15μmol/L时,MCF-7细胞凋亡率明显增加(P0.05,P0.01);As_4O_6高(3μmol/L)、低(1μmol/L)浓度均可有效抑制MCF-7细胞的迁移能力(P0.01);随As_4O_6浓度增加,Cyclin E1、Caspase-3、p21 m RNA表达明显升高,Cyclin A2、MMP-9 m RNA表达明显降低(P0.05,P0.01)。结论 As_4O_6对乳腺癌MCF-7细胞增殖、周期、侵袭及迁移能力有明显抑制作用,其机制可能与增强Cyclin E1、Caspase-3、p21及抑制Cyclin A2、MMP-9 m RNA表达有关。     

芒柄花素对人非小细胞肺癌细胞增殖、凋亡的影响及相关机制探讨

目的:探讨芒柄花素对人非小细胞肺癌(NSCLC)细胞增殖、凋亡的影响,并探讨其作用机制。方法:培养人NSCLC细胞株A549,分别按10,20,40,80,160μmol·L~(-1)梯度浓度加入芒柄花素,另设不含药物空白组,培养48 h后采用噻唑蓝(MTT)比色法检测细胞增殖活力,利用Annexin V-FIFC/碘化丙啶(PI)双标法检测细胞凋亡情况,利用流式细胞仪检测细胞周期,利用实时荧光定量PCR(Real-time PCR)和免疫印迹法(Western blot)分别检测细胞中周期蛋白E_1(cyclin E_1),B淋巴细胞瘤-2(Bcl-2)和Bcl-2相关X蛋白(Bax)mRNA和蛋白表达。结果:40,80,160μmol·L~(-1)芒柄花素组细胞生长抑制率和细胞凋亡率均高于空白组(P0.05)。与空白组比较,40,80,160μmol·L~(-1)芒柄花素组G_0/G_1期细胞比例上升,S期细胞比例下降,80,160μmol·L~(-1)芒柄花素组下降更为明显(P0.05);40,80,160μmol·L~(-1)芒柄花素组cyclin E_1,Bcl-2 mRNA和蛋白表达量均较空白组降低,Bax mRNA和蛋白表达量升高,与40μmol·L~(-1)芒柄花素组比较,80,160μmol·L~(-1)芒柄花素组cyclin E_1,Bcl-2 mRNA和蛋白表达量均降低,Bax mRNA和蛋白表达量升高(P0.05)。结论:芒柄花素可抑制NSCLC细胞增殖,加速细胞凋亡发生,可能通过下调cyclin E_1表达而影响细胞周期,并通过调控Bcl-2和Bax表达而促使细胞凋亡发生。     

黄芪皂苷干预乳腺癌细胞MCF-7的体外实验研究

目的:研究黄芪皂苷在体外对人乳腺癌细胞系MCF-7细胞的增殖与凋亡的影响,探讨其抗肿瘤机制。方法:取对数生长期的人乳腺癌细胞MCF-7,分为对照组和不同浓度黄芪皂苷组(2.5μg/m L,5μg/m L,10μg/m L,20μg/m L);采用CCK-8法检测黄芪皂苷对MCF-7细胞增殖抑制率的影响,流式细胞仪检测细胞凋亡情况,Realtime PCR法检测Bcl-2、BAX、MMP-9、nm23-H1 m RNA的表达情况。结果:黄芪皂苷能抑制乳腺癌细胞MCF-7的增殖,抑制作用呈剂量-效应和时间-效应关系;黄芪皂苷能够诱导MCF-7的凋亡,早期凋亡率、晚期凋亡率和总凋亡率均随着黄芪皂苷作用浓度的增加及作用时间的延长而增加;黄芪皂苷能上调BAX和nm23-H1基因的表达,同时使Bcl-2和MMP-9基因的表达下调。结论:黄芪皂苷在体外对乳腺癌细胞MCF-7的增殖和转移有抑制作用,其作用途径是通过调节细胞凋亡相关基因与肿瘤转移相关基因的表达,从而诱导肿瘤细胞的凋亡。     

苏木乙酸乙酯提取液靶向调控miRNA-99a抑制动脉粥样硬化的作用机制研究

目的研究苏木乙酸乙酯提取液(SAEE)对氧化型低密度脂蛋白(ox-LDL)诱导的血管平滑肌细胞(VSMC)增殖、凋亡的机制及miRNA-99a在其中的可能作用。方法 ox-LDL诱导VSMC模型,分别将SAEE(200μg/mL)、miRNA-99a模拟剂、miRNA-99a抑制剂作用于细胞。采用MTT法检测各组VSMC的增殖,流式细胞学检测其凋亡水平,Western blotting法检测细胞中Ki-67、PCNA、Bax、Bcl-2、MMP-1、TIMP-1蛋白的表达,RT-PCR检测细胞中miRNA-99a的表达。结果与空白组相比,ox-LDL能显著增加VSMC细胞增殖、晚期凋亡和总凋亡率,上调细胞中Ki-67、PCNA、Bax、MMP-1蛋白的表达及Bax/Bcl-2、MMP-1/TIMP-1的比值,下调Bcl-2、TIMP-1蛋白和miRNA-99a的表达,差异均具有显著统计学意义(P 0.01);SAEE能够抑制VSMC细胞增殖、晚期凋亡和总凋亡率,上调Bcl-2、TIMP-1蛋白和mi R-99a的表达,下调细胞中Ki-67、PCNA、Bax、MMP-1蛋白的表达及Bax/Bcl-2、MMP-1/TIMP-1的比值,与模型组比较,差异均具有统计学意义(P 0.01)。结论 SAEE能够通过上调细胞中miRNA-99a的表达,抑制VSMC细胞增殖、凋亡和细胞外基质的降解,促进斑块的稳定和防止纤维帽的破裂,发挥抗动脉粥样硬化的作用。     

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??OBJECTIVE To study the effect of isoalantolactone on inhibiting proliferation of MCF-7 and induce apoptosis in vitro and further to explore its machinism via mitochondrial and phosphatidylinositol 3-kinase/Akt signaling pathways. METHODS The subject investigated isoalantolactone in MCF-7 cells proliferation inhibition by MTT and SRB methods, and matching the results of two methods; observing morphological changes by inverted microscope and each phase of apoptosis of MCF-7 cells effected by isoalantolactone after 24 h with Hoechst 33258 staining method. Using transmission electron microscopy to observe MCF-7 cells morphology change to determine the mechanism of research; rhodamine 123 tag, laser confocal scanning microscope detection isoalantolactone on the effect of MCF-7 cells mitochondrial membrane potential; Using Western blot to the expression of Bcl-2,Bax,Akt and p-Akt; detecting caspase-3 activity in MCF-7 cells by colorimetry method. RESULTS Isoalantolactone has strong inhibition of proliferation in MCF-7 cells, IC₅₀ values of MTT and SRB methods were 15.21 and 14.908 ??g??mL^-1, and in a dose -dependent manner; the morphological of MCF-7 cells was changed after the treatment by Hoechst staining method; morphological changes were observed under transmission electron microscopy of cells display, the drug group cells showed typical apoptotic characteristics of different periods. With the concentrations of isoalantolactone increasing, the level of mitochondrial membrane potential reduced. Western blot result showed that, isoalantolactone could down regulate the expression of anti apoptotic protein Bcl-2, p-Akt, and up regulate the expression of pro-apoptotic protein Bax, had no effect on the expression of Akt protein. And the activity of caspase-3 could be raised by increasing dosage, compared with the control group with significant difference(P<0.01). CONCLUSION Isoalantolactone effectively inhibites the proliferation of MCF-7 cells through mitochondrial and phosphatidylinositol 3-kinase/Akt signaling pathways, which is regulated by activation of caspase-3, down-regulation of Bcl-2, and up-regulation of Bax. Isoalantolactone-induced apoptosis is involved in mitochondrial and the PI3K/Akt pathway.     

Dehydrocorydaline inhibits breast cancer cells proliferation by inducing apoptosis in MCF-7 cells

Dehydrocorydaline is an alkaloid isolated from traditional Chinese herb Corydalis yanhusuo W.T. Wang. We discovered that it possessed anti-tumor potential during screening of anti-tumor natural products from Chinese medicine. In this study, its anti-tumor potential was investigated with breast cancer line cells MCF-7 in vitro. The anti-proliferative effect of dehydrocorydaline was determined by MTT assay and the mitochondrial membrane potential (Δ Ψ m) was monitored by JC-1 staining. DNA fragments were visualized by Hoechst 33342 staining and DNA ladder assay. Apoptotic related protein expressions were measured by Western blotting. Dehydrocorydaline significantly inhibited MCF-7 cell proliferation in a dose- dependent manner, which could be reversed by a caspase-8 inhibitor, Z-IETD-FMK. Dehydrocorydaline increased DNA fragments without affecting ΔΨm. Western blotting assay showed that dehydrocorydaline dose-dependently increased Bax protein expression and decreased Bcl-2 protein expression. Furthermore, dehydrocorydaline induced activation of caspase-7,-8 and the cleavage of PARP without affecting caspase-9. These results showed that dehydrocorydaline inhibits MCF-7 cell proliferation by inducing apoptosis mediated by regulating Bax/Bcl-2, activating caspases as well as cleaving PARP.     

太白银莲花皂苷-A诱导人胶质瘤U87细胞凋亡及其机制研究

目的探讨太白银莲花皂苷A诱导胶质瘤U87细胞株细胞凋亡作用及机制。方法以四甲基偶氮唑蓝(MTT)比色法检测太白银莲花皂苷A对U87细胞和VEC304细胞存活率的影响;Hoechst 33342核染色后荧光显微镜下观察细胞核形态学变化;透射电子显微镜观察太白银莲花皂苷A处理后U87细胞超微结构;流式细胞仪AnnexinV/IP双染检测太白银莲花皂苷A处理后U87细胞凋亡比率;免疫印迹法(Western blot)检测致凋亡分子Fas、Fas-L、Pro-Caspase8、Pro-Caspase3、Bcl-2、Bax等表达情况。结果极低浓度(<5 mg/L)下太白银莲花皂苷A处理后U87细胞生存率明显下降,同比正常EVC304细胞生存率影响不显著;Hoechst 33342核染色及透射电镜下均可见典型细胞凋亡形态学变化;流式细胞仪分析显示低浓度太白银莲花皂苷A(1.75 mg/L IC50)处理后U87细胞系早期凋亡细胞比率随时间递增,呈明显时间依赖性;免疫印迹实验发现太白银莲花皂苷A处理U87细胞6,12,24 h后细胞Fas及Fas-L表达递增,Pro-Caspase8、Pro-Caspase3递减,活化Caspase-3片段12 h达到峰值,Bcl-2表达差别不显著,Bax表达未测出。结论太白银莲花皂苷A能够诱导U87细胞凋亡,并且其机制与Fas介导的表面受体凋亡通路有关。     

Bee venom suppresses PMA-mediated MMP-9 gene activation via JNK/p38 and NF-κB-dependent mechanisms

Ethnopharmacological relevance

Bee venom has been used for the treatment of inflammatory diseases such as rheumatoid arthritis and for the relief of pain in traditional oriental medicine.

Aim of the study

The purpose of this study is to elucidate the effects of bee venom on MMP-9 expression and determine possible mechanisms by which bee venom relieves or prevents the expression of MMP-9 during invasion and metastasis of breast cancer cells. We examined the expression and activity of MMP-9 and possible signaling pathway affected in PMA-induced MCF-7 cells.

Material and methods

Bee venom was obtained from the National Institute of Agricultural Science and Technology of Korea. Matrigel invasion assay, wound-healing assay, zymography assay, western blot assay, electrophoretic mobility shift assay and luciferase gene assay were used for assessment.

Results

Bee venom inhibited cell invasion and migration, and also suppressed MMP-9 activity and expression, processes related to tumor invasion and metastasis, in PMA-induced MCF-7 cells. Bee venom specifically suppressed the phosphorylation of p38/JNK and at the same time, suppressed the protein expression, DNA binding and promoter activity of NF-κB. The levels of phosphorylated ERK1/2 and c-Jun did not change. We also investigated MMP-9 inhibition by melittin, apamin and PLA₂, representative single component of bee venom. We confirmed that PMA-induced MMP-9 activity was significantly decreased by melittin, but not by apamin and phospholipase A₂. These data demonstrated that the expression of MMP-9 was abolished by melittin, the main component of bee venom.

Conclusion

Bee venom inhibits PMA-induced MMP-9 expression and activity by inhibition of NF-κB via p38 MAPK and JNK signaling pathways in MCF-7 cells. These results indicate that bee venom can be a potential anti-metastatic and anti-invasive agent. This useful effect may lead to future clinical research on the anti-cancer properties of bee venom.     

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??OBJECTIVE To explore the protective effect of palmitic acid against glutamate-induced apoptosis in PC12 cells. METHODS PC12 cells were randomly divided into six groups: normal group, solvent group(DMSO 0.1%), model group (Glu 25 mmol??L^-1), nimodipine(NMP,7 ??mol??L^-1)-treated group or MK801(10 ??mol??L^-1) -treated group set as positive control group, palmitic acid groups of 100, 10, 1 ??mol??L^-1 dose. Cell viability and membrane permeability were examined by MTT assay and LDH kit. Morphologic change of apoptosis were detected by AO/EB and Hoechst staining with fluorescence microscope. The apoptosis rates were measured by flow cytometry using fluorescein labeling FITC-Annexin V/PI. The expression of Bcl-2, Bax and GluR1 protein was assayed by Western blot methods. RESULTS Compared with the model group, the results showed that palmitic acid could significantly improve the viability of PC12 cells damaged by glutamate, and reduce the permeability of cell membranes. After AO/EB staining, nuclear chromatin of the cells in model group were stained strongly into orange by EB. In palmitic acid ?Ctreated group, only few cells were stained into orange. Compared with model group, after the treatment of palmitic acid , slight blue fluroscence stained by Hoechst in nucleus had been emitted. Palmitic acid could increase the expression of Bcl-2 and inhibit the level of the expression of Bax protein and GluR1 protein. CONCLUSION In summary, palmitic acid had protective effect on glutamate-induced apoptosis in PC12 cells through increasing the expression of Bcl-2 and inhibiting the expression of Bax and GluR1.
     

香叶木素通过线粒体凋亡途径对人乳腺癌MCF-7细胞增殖及凋亡的影响

目的探讨香叶木素对人乳腺癌MCF-7细胞增殖、凋亡的影响及其作用机制。方法将MCF-7细胞分为对照组(0μmol·L^-1)和香叶木素5、10、20、30、40、50、60、70μmol·L^-1浓度组。采用CCK-8法及2,4二硝基苯肼法检测MCF-7细胞活力、乳酸脱氢酶(LDH)泄露量;采用罗丹明123(Rh123)荧光染色法、流式细胞术及荧光显微镜检测MCF-7细胞线粒体膜电位(MMP);DCFH-DA法检测细胞内活性氧(ROS)含量;Annexin V-FITC/PI双染法检测细胞凋亡;Western Blot法检测p53、Bax、Caspase 3及Bcl-2蛋白的表达。结果与对照组比较,香叶木素在5~70μmol·L^-1范围内能够浓度依赖性地抑制MCF-7的细胞活力及促进LDH的泄露(P<0.01,P<0.001),选取浓度10、30、50μmol·L^-1进行后续实验;香叶木素10、30、50μmol·L^-1浓度组能显著降低MCF-7细胞线粒体膜电位(P<0.05,P<0.01,P<0.001),促进细胞内ROS的积累(P<0.01,P<0.001),提高细胞凋亡率(P<0.001),显著上调p53(30、50μmol·L^-1)、Bax及Caspase 3蛋白的表达(P<0.001),下调Bcl-2蛋白的表达(P<0.01,P<0.001)。结论香叶木素可能通过ROS及p53介导的线粒体凋亡途径抑制MCF-7细胞的增殖及促进其凋亡。     

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??OBJECTIVE To investigate the anti-proliferation effects of andrographolide Derivative(ADA) and its potential anti-tumor mechanisms in MCF-7 cells. METHODS The anti-proliferation effects of ADA were assessed by MTT assay in MCF-7 cells. Apoptotic morphological changes of MCF-7 cells after ADA treatment were observed by high content screening (HCS) after AO/EB double staining and DAPI, Apoptotic number was investigated by using flow cytometry. The expression of Bcl-2, Bax,caspase 3,NF-??B p65,p-I??B?? and p-IKK?? were measured using Western blot.RESULTS MTT assay demonstrated that ADA exerted potent anti-tumor effect in a significant concentration-dependent manner;ADA could promote the apoptosis of MCF-7 cells. Western blot results showed that Bcl-2 families and NF-??B p65 and caspase 3 involved in the process of apoptosis, Bcl-2 expression lowered(P<0.05),p-I??B?? and p-IKK?? expression decreased(P<0.01), Bax, NF-??B p65 and caspase 3 expression increased(P<0.01). CONCLUSION ADA could inhibit the proliferation of MCF-7 cells and mechanism may be that it might induce apoptosis by regulated the expression of Bax, Bcl-2 and caspase 3 protein and NF-??B passway.     

褐藻素通过PI3K/AKT信号通路抑制食管鳞癌细胞迁移和侵袭

目的 研究褐藻素对人食管鳞癌EC109和EC9706细胞迁移和侵袭的影响,并初步探究其作用机制.方法 采用四甲基偶氮唑蓝(MTT)法检测不同浓度的褐藻素对食管鳞癌细胞活性的影响;采用划痕实验、Transwell迁移和侵袭实验分别考察褐藻素对食管鳞癌细胞迁移和侵袭能力的影响;使用Western blotting实验检测褐...     

解毒祛瘀方联合化疗对MCF-7人乳腺癌细胞凋亡和Bcl-2/Bax表达的影响

目的: 观察解毒祛瘀方联合化疗对MCF-7人乳腺癌细胞凋亡和Bcl-2/Bax表达的影响。 方法: 采用MTT法测定药物对MCF-7细胞增殖抑制作用;流式细胞术双标法检测细胞凋亡指数;免疫细胞化学检测Bcl-2,Bax的表达状况。 结果: 解毒祛瘀方能够抑制MCF-7细胞的增殖,且对时间、药物浓度呈依赖关系;对化疗有增效作用。通过流式细胞术双标法检测发现解毒祛瘀方对诱导早期MCF-7细胞凋亡更有优势;在分子蛋白层面上,解毒祛瘀方可以明显降低MCF-7细胞Bcl-2的表达,且对时间、药物浓度呈依赖关系;Bax表达与对照组比较则无明显差异;Bcl-2/Bax呈下降趋势。 结论: 解毒祛瘀方能抑制肿瘤细胞增殖,促进凋亡,并对化疗有增效作用,降低Bcl-2表达是其可能机制之一。