青藤碱诱导肺癌NCI-H460细胞凋亡及其机制的实验研究

目的：探究青藤碱（SIN）诱导肺癌NCI-H460细胞凋亡的作用机制。方法：四甲基偶氮唑蓝（MTT）法测定SIN对肺癌NCI-H460细胞生长的影响;Western blot测定Bcl-2,Bax蛋白的表达;用SIN、PI3K/Akt和MAPK/ERK信号通路抑制剂干预NCI-H460细胞,流式细胞术检测细胞的凋亡率。结果：SIN对肺癌NCI-H460细胞生长有抑制作用,呈时间、浓度依赖性;SIN可以使NCI-H460细胞Bcl-2表达减低,Bax增强;SIN与PI3K/Akt和MAPK/ERK信号通路抑制剂联用后可协同增加NCI-H460细胞凋亡（P〈0.05）。结论：SIN可以抑制肺癌NCI-H460细胞的生长,能改变其Bax,Bcl-2蛋白的表达,与PI3K/Akt和MAPK/ERK信号通路抑制剂联用可协同发挥促进肺癌细胞凋亡作用,可望成为新的肺癌治疗药物。     

DADS通过MAPK和PI3K/Akt 信号通路下调Mcl-1诱导白血病细胞凋亡*

目的:二烯丙基二硫（DADS）为天然植物大蒜中的提取物,能抑制多种肿瘤细胞生长,本文探讨丝裂原激活的蛋白激酶（MAPKs）、3- 磷酸肌醇激酶（PI 3K/Akt）信号通路和Bcl- 2 家族成员在DADS诱导的人白血病HL- 60细胞凋亡中的作用。方法:利用流式细胞术检测DADS 诱导的白血病细胞凋亡,Western blot研究MAPKs和PI 3K/Akt信号通路在DADS 诱导的人白血病HL- 60细胞凋亡中的变化及对Bcl- 2 家族凋亡相关蛋白表达的影响。结果:DADS呈浓度和时间依赖性地诱导人白血病HL- 60细胞凋亡,在此过程中ERK/MAPK 和PI 3K/Akt信号通路被抑制,而p38MAPK 信号通路被激活,ERK/MAPK 和PI 3K/Akt信号通路通过降低Mcl-1（myeloid cell leukemia-1）和升高Bax 的表达诱导人白血病细胞凋亡,而p38MAPK 则不是通过调控Mcl-1 和Bax 的表达诱导人白血病细胞凋亡,进一步利用RNA干扰技术沉默Mcl-1 基因可增加DADS对HL- 60细胞增殖抑制和诱导凋亡作用。结论:MAPK 和PI 3K/Akt信号通路通过下调Mcl-1 的表达参与了DADS诱导的HL- 60细胞凋亡作用。      

姜黄素对人结肠癌细胞PI3-K/Akt和MEK/ERK信号通路的影响

目的:探讨姜黄素对人结肠癌RKO细胞PI3-K/Akt和MEK/ERK通路的影响。方法:MTT法检测细胞活力,Western blot检测p-Akt、Akt、p-ERK,ERK及凋亡相关蛋白Bcl-2、Bax的表达。结果:姜黄素作用人结肠癌RKO细胞,24h和48h的IC50值分别为51.69μg/ml和36.12μg/ml。选用50μg/ml的姜黄素分别作用24h和48h,RKO细胞凋亡百分比为26.79%和42.16%,与对照组相比有显著差异(P＜0.05)。进一步检测发现姜黄素（50μg/ml）显著下调了p-Akt 和p-ERK的表达,同时Bcl-2与Bax的比值显著下调。结论:姜黄素可能通过抑制PI3-K/Akt和MEK/ERK信号通路的活化、下调Bcl-2与Bax的比值,从而抑制RKO细胞增殖和诱导细胞凋亡。     

内质网激动剂调控PI3K/AKT/mTOR通路诱导人小细胞肺癌NCI-H446细胞凋亡

目的 检测内质网应激能否通过PI3K/AKT/mTOR通路对人小细胞肺癌NCI-H446细胞凋亡产生作用.方法 采用MTT法检测不同浓度衣霉素对人小细胞肺癌NCI-H446的细胞毒性,Annexin V/PI检测药物作用下人小细胞肺癌NCI-H446细胞凋亡情况,Western Blot检测PI3K/AKT/mTOR通路相关蛋白的表达.结果 衣霉素可抑制人小细胞肺癌NCI-H446细胞的活性,且呈时间和浓度依赖性.衣霉素能够激活内质网应激,抑制PI3K/AKT/mTOR信号通路,使PI3K、AKT、mTOR蛋白磷酸化下调,诱导细胞凋亡.结论 内质网激动剂能够调控PI3K/AKT/mTOR通路诱导人小细胞肺癌NCI-H446细胞凋亡.     

苦参碱对视网膜母细胞瘤细胞增殖、凋亡及PI3K/Akt信号通路的影响

目的 探讨苦参碱（Mat）对视网膜母细胞瘤细胞Y79细胞增殖、凋亡及PI3K/Akt信号通路的影响。方法 Y79细胞经0.5、1.0、1.5 g/L Mat处理24 h后,采用CCK-8试剂盒检测细胞增殖情况,磷酯酰丝氨酸结合蛋白-异硫氢酸荧光素/碘化丙啶（Annexin V-FITC/PI）双标记流式细胞术检测细胞凋亡情况,Western blotting免疫印迹检测各浓度Mat处理后凋亡相关蛋白Bcl-2及Bax、PI3K/Akt信号通路重要蛋白PI3K p85亚基、Akt及其磷酸化形式p-Akt的蛋白水平。结果 不同浓度Mat作用Y79细胞24 h后,可呈浓度依赖性方式抑制细胞增殖,增加细胞凋亡率（P＜0.05）。Western blotting检测发现,Mat可明显增加促凋亡蛋白Bax表达,降低抗凋亡蛋白Bcl-2水平并可降低PI3K p85α亚基及磷酸化Akt的蛋白水平（P＜0.05）,对总Akt水平无明显影响。结论 Mat可抑制人视网膜母细胞瘤增殖并诱导其凋亡,可能与抑制PI3K/Akt 信号通路有关。     

青藤碱通过线粒体途径诱导肺癌NCI-H460细胞凋亡的初步研究

目的:研究青藤碱(sinomenine,SIN)对人肺癌NCI-H460细胞株的生长抑制及诱导凋亡作用及其机制。方法:四甲基偶氮噻蓝（MTT）法检测细胞增殖的抑制作用,流式细胞仪AnnexinV/PI双染法检测细胞凋亡,TdT酶介导的dUTP缺口末端标记（TUNNEL）方法观察细胞的凋亡,罗丹明123(Rhodamine123)染色流式细胞仪检测线粒体膜电位(ΔΨm)。结果:SIN对NCI-H460细胞株生长具有抑制作用并诱导凋亡。AnnexinV/PI双染检测细胞的凋亡可见随SIN浓度增加,细胞凋亡增加呈浓度依赖性。TUNNEL阳性的凋亡细胞呈棕黄色,细胞核片段化改变。罗丹明染色检测线粒体膜电位的结果提示在SIN作用于NCI-H460细胞48h后,线粒体膜电位下降,SIN浓度越高,膜电位下降越显著。结论:SIN具有明显的细胞毒作用,能诱导NCI-H460细胞凋亡,SIN通过线粒体途径诱导NCI-H460细胞凋亡。     

PTEN/PI3K/Akt信号通路对K562细胞凋亡调控的研究

 目的 探讨PTEN/PI3K/Akt信号传导通路对人慢性粒细胞白血病细胞系K562的增殖、凋亡调控的研究及可能的分子作用机制。 方法 将携带有野生型PTEN及绿色荧光蛋白的腺病毒（Ad-PTEN-GFP）及空载体（Ad-GFP）腺病毒,转染人慢性粒细胞白血病细胞系K562。通过MTT检测细胞生长曲线,流式细胞术检测细胞凋亡率和细胞增殖指数,同时用细胞光镜、电镜形态等方法检测细胞凋亡,荧光定量PCR（FQ-PCR）检测PTEN及凋亡相关基因Bcl-2、Bcl-_xL、Bax mRNA水平变化,Western blot检测PTEN及Akt、p-Akt蛋白水平变化。 结果 与Ad-GFP组相比,Ad-PTEN-GFP 转染K562细胞后,细胞增殖受抑,增殖指数降低,凋亡率增加,p-Akt表达降低,抗凋亡相关基因Bcl-2、Bcl-_xL mRNA表达降低,促凋亡基因Bax mRNA表达增加。 结论 过表达PTEN可能通过抑制PI3K/Akt通路抑制K562细胞系增殖,促进细胞凋亡。     

HER-2/neu对雌激素依赖性子宫内膜癌细胞信号通路(MAPK/ERK,PI3K/Akt)调控的研究

目的:利用HER-2/neu转染前后的Ishikawa细胞株,探讨HER-2/neu对雌激素依赖性子宫内膜癌细胞信号通路(MAPK/ERK、PI3K/Akt)的调控作用。方法:表皮生长因子(endothelial growth factor)处理HER-2/neu转染前后的Ishikawa细胞株,Western-blot检测转染前后细胞COX-2、t-Akt及p-Akt蛋白、t-ERK及p-ERK表达,ELISA方法检测细胞培养上清液中雌二醇的含量。用PI3K/Akt的抑制剂LY294002及MAPK/ERK的抑制剂PD98059抑制信号通路,以不同浓度作用相同时间和以相同浓度分别作用不同时间后,检测COX-2及雌二醇表达水平。结果:转染HER-2/neu的Ishikawa细胞株COX-2蛋白、p-Akt蛋白、p-ERK及细胞上清液中的雌二醇的含量均高于未转染的Ishikawa细胞株(P<0.05)。应用抑制剂分别抑制上述两种通路,转染后细胞株中COX-2的表达水平低于转染前Ishikawa细胞株,同时转染组细胞上清液中雌二醇的含量较未转染组下降明显,降幅更大。随抑制剂浓度的增加及作用时间的延长,两组细胞COX-2及雌二醇的表达均逐渐减少,且抑制作用与浓度及作用时间呈负相关关系。结论:子宫内膜癌Ishikawa细胞株HER-2/neu基因表达的增强进一步引起COX-2、E2表达的增加,可能是通过对信号通路MAPK/ERK、PI3K/Akt的调控而实现的。     

罗格列酮诱导人肝癌HepG2细胞凋亡中p38MAPK通路的作用北大核心CSCD

目的研究罗格列酮对人肝癌HepG2细胞增殖与凋亡的影响,探讨p38丝裂原活化蛋白激酶(p38MAPK)通路相关蛋白在其中发挥的作用。方法 MTT法检测罗格列酮对人肝癌HepG2细胞的增殖抑制率,流式细胞术检测细胞凋亡率,透射电子显微镜观察细胞凋亡形态变化,Western blot检测p38MAPK通路相关蛋白表达变化。结果罗格列酮可抑制HepG2细胞的增殖,诱导细胞凋亡(P<0.05);电子显微镜下可观察到典型的HepG2细胞凋亡表现。Western blot结果显示罗格列酮可激活p38MAPK通路,上调HepG2细胞中磷酸化p53及Bax蛋白的表达,下调Bcl-2蛋白的表达(P<0.05);而细胞外信号调节激酶ERK1/2的磷酸化程度没有明显改变。p38MAPK通路抑制剂SB203580可显著降低罗格列酮诱导的HepG2细胞的凋亡率;并且SB203580可部分逆转由罗格列酮引发的磷酸化p53、Bax及Bcl-2蛋白的表达变化。结论罗格列酮可通过激活p38MAPK通路诱导人肝癌HepG2细胞凋亡,其机制可能与p38MAPK通路参与磷酸化p53、Bax及Bcl-2蛋白的调控有关。     

文殊兰叶氯仿提取物诱导NCI-H460细胞凋亡的研究

目的研究文殊兰叶氯仿提取物（CE）对非小细胞肺癌NCI-H460细胞增殖和凋亡的影响。方法通过MTT法检测CE对NCI-H460细胞的生长抑制作用;采用Hoechst 33258荧光染色法检测CE作用后凋亡细胞形态的变化;通过免疫细胞化学检测细胞凋亡相关蛋白Bcl-2和Bax的表达;采用流式细胞术（FCM）检测CE作用后对细胞周期的影响。结果CE抑制NCI-H460细胞增殖,其24、48、72 h的IC50分别为：（36.22 ±3.04）、（41.21±2.50）、（62.55±3.47） mg/L;荧光染色显示,经CE作用后的细胞出现细胞核裂解,染色质浓缩,产生凋亡小体;免疫细胞化学法显示CE能增强促进凋亡蛋白Bax和降低抑制凋亡蛋白Bcl-2的表达;FCM检测表明CE作用后的细胞被阻滞在G1/S期。结论CE在体外能有效地抑制NCI-H460细胞生长,其机制可能与改变细胞周期并诱导细胞凋亡有关。     

Hypoxia confers protection against apoptosis via PI3K/Akt and ERK pathways in lung cancer cells

Hypoxia confers protection against apoptosis in cancer cells, and this hypoxia-induced resistance to apoptosis has been suggested to be associated with genetic and adaptive changes. However, it is not clear whether survival signals, such as the PI3K/Akt and ERK pathways are involved. We investigated the roles of these pathways in hypoxia-induced protection against apoptosis in lung cancer cells. Treatment of cells with either ultraviolet (UV) or etoposide induced apoptosis time-dependently in A549 and NCI-H157 cells. However, though hypoxia alone neither induced apoptosis nor reduced cell survival, it suppressed the apoptosis induced by UV or etoposide. Moreover, hypoxia activated the PI3K/Akt and ERK pathways, and blocking the activation of either pathway reversed resistance to UV- and etoposide-induced apoptosis in response to hypoxia. These results suggest that hypoxia confers resistance to UV- or etoposide-mediated apoptosis in lung cancer cells via the activations of the PI3K/Akt and the ERK pathways.     

NFV, an HIV-1 protease inhibitor, induces growth arrest, reduced Akt signalling, apoptosis and docetaxel sensitisation in NSCLC cell lines

HIV-1 protease inhibitor (PI), nelfinavir (NFV) induced growth arrest and apoptosis of NCI-H460 and -H520, A549, EBC-1 and ABC-1 non-small-cell lung cancer (NSCLC) cells in association with upregulation of p21waf1, p27kip1 and p53, and downregulation of Bcl-2 and matrix metalloproteinase (MMP)-2 proteins. We found that NFV blocked Akt signalling in these cells as measured by Akt kinase assay with glycogen synthase kinase-3alpha/beta (GSK-3alpha/beta) as a substrate. To explore the role of Akt signalling in NFV-mediated growth inhibition of NSCLC cells, we blocked this signal pathway by transfection of Akt small interfering RNA (siRNA) in these cells; transient transfection of Akt siRNA in NCI-H460 cells decreased the level of Bcl-2 protein and slowed their proliferation compared to the nonspecific siRNA-transfected cells. Conversely, forced-expression of Akt partially reversed NFV-mediated growth inhibition of these cells, suggesting that Akt may be a molecular target of NFV in NSCLC cells. Also, we found that inhibition of Akt signalling by NFV enhanced the ability of docetaxel to inhibit the growth of NCI-H460 and -H520 cells, as measured by MTT assay. Importantly, NFV slowed the proliferation and induced apoptosis of NCI-H460 cells present as tumour xenografts in nude mice without adverse systemic effects. Taken together, this family of compounds might be useful for the treatment of individuals with NSCLC.     

PI3 kinase integrates Akt and MAP kinase signaling pathways in the regulation of prostate cancer

PI3 kinase (PI3K), Akt and MAP kinase (MAPK) pathways are central to many classical signaling cascades and are often de-regulated in many cancers. Due to this, inhibitors for a number of key signaling molecules in these pathways such as PI3K, Akt, mTOR, Raf and ERK are currently in clinical trials. In the current study, we investigated the effects of specific inhibition of these signaling molecules, alone or in combinations, on prostate cancer cells. Our study showed that integration of Akt-mTOR and MAPK signaling by PI3K was essential for the EGF-stimulated TRAMP cell migration, proliferation, survival and invasion as well as PC3 and LNCaP C4-2 (C4-2) colony/foci formation. Adenovirus-mediated expression of constitutively active Akt (Ad-myrAkt) in PC3 cells resulted in significant increase in number of foci. Even though PI3K inhibition significantly reduced foci formed by C4-2 cells, none of the Akt, ERK or mTOR inhibitors showed any significant inhibition. This indicated that functional redundancies and/or feed back loops between Akt-mTOR and MAPK signaling exist in prostate cancer. Further studies on cotargeting these signaling molecules revealed that combined inhibition of Akt (or mTOR) and ERK, but not Akt and mTOR, resulted in significant reduction in number of foci formed by the C4-2 cells. Overall, our study demonstrated that the effects of PI3K-mediated prostate cancer growth necessitates a synergism between the Akt and MAPK pathways and suggests cotargeting Akt (or mTOR) and MAPK as an effective method for prostate cancer therapeutic interventions.     

Vacquinol-1对非小细胞肺癌细胞增殖和凋亡的影响

目的:探讨Vacquinol-1对非小细胞肺癌细胞系A549、NCI-H1299细胞增殖和凋亡的影响及可能机制。方法:以不同浓度的Vacquinol-1作用于A549和NCI-H1299细胞,应用CCK-8法检测其对细胞增殖能力的影响;以半数致死浓度（half maximal inhibitory concentration,IC50）作用于细胞,流式细胞术Annexin V/PI双染色法检测细胞的凋亡情况;Western blotting法检查凋亡相关蛋白Caspase-3、Bcl-2和Bax表达的变化情况。结果:CCK-8结果显示Vacquinol-1能显著抑制A549、NCI-H1299细胞的增殖能力;并且流式细胞术检测结果显示Vacquinol-1能诱导A549、NCI-H1299细胞的凋亡;Western blotting结果显示Vacquinol-1促进A549、NCI-H1299细胞Caspase-3、Bax的表达,抑制Bcl-2的表达。结论:Vacquinol-1能够抑制非小细胞肺癌细胞的增殖,并且通过激活线粒体通路诱导细胞凋亡。     

Response of non-small cell lung cancer cells to the inhibitors of phosphatidylinositol 3-kinase/Akt- and MAPK kinase 4/c-Jun NH2-terminal kinase pathways: an effective therapeutic strategy for lung cancer.

PURPOSE: We previously showed that phosphatidylinositol 3-kinase (PI3K)/Akt and mitogen-activated protein kinase (MAPK) pathways cooperate to promote non-small cell lung cancer (NSCLC) cell proliferation in vitro. This study was designed to explore whether inhibition of these pathways effectively inhibits NSCLC tumor growth in vivo. EXPERIMENTAL DESIGN: The effects of PI3K/Akt inhibitors {LY294002, adenoviruses expressing dominant-negative mutant of the p85alpha adaptor subunit of PI3K (Ad-dnp85alpha), dominant-negative Akt [Ad-HA-Akt(KM)], or PTEN (Ad-PTEN)}, MKK4/c-jun NH2-terminal kinase (JNK) inhibitor [SP600215, adenovirus expressing dominant-negative MKK4, Ad-MKK4(KR)], and their combinations on proliferation and apoptosis in NSCLC cells were tested in vitro and in vivo using the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay, a flow cytometry-based terminal deoxynucleotidyl transferase-mediated nick-end labeling assay, Western blot and immunohistochemical analyses, and an NSCLC xenograft tumor model. RESULTS: Ad-dnp85alpha significantly inhibited proliferation of a subset of NSCLC cell lines used in our study. Intratumoral injection of Ad-dnp85alpha induced a significant decrease in the growth of H1299 NSCLC xenograft tumors. Concurrent inhibition of the PI3K/Akt and MKK4/JNK pathways showed enhanced antiproliferative effects on H1299 cells in vitro and in vivo by increasing apoptosis. CONCLUSIONS: PI3K/Akt and MKK4/JNK pathways cooperate to stimulate NSCLC cell proliferation by maintaining cell survival, suggesting that simultaneously targeting these two pathways might be an effective therapeutic strategy against NSCLC.     

防己诺林碱对肺癌H1299和A549细胞的作用及其分子机制研究

目的 探究防己诺林碱在肺癌中的作用及其分子机制。方法 MTS法检测经10、15、20、30、40和60 μM/L防己诺林碱处理的肺癌H1299和A549细胞的增殖情况,通过Caspase3、Caspase8和Caspase9活性检测试剂盒和TUNEL试剂盒检测细胞凋亡情况。Western blot检测MAPK信号通路(p-Akt、PI3K、mTOR和Akt蛋白)、增殖和转移(MMP-2、MMP-9、PCNA、Cyclin D1和P21蛋白)、周期和凋亡(Cyclin D2、Bcl2、MCL-1、Bax和p53蛋白)相关蛋白的表达情况,通过Real-time PCR检测PI3k、mTOR、MMP-2、MMP-9、PCNA、Cyclin D1、Cyclin D2、MCL-1、Bax、Bcl2和TP53基因表达情况。结果 防己诺林碱会抑制肺癌H1299和A549细胞的增殖,诱导细胞凋亡,增加Caspase3、Caspase8和Caspase9酶活性。经防己诺林碱处理后,PI3K、p-Akt、mTOR、MMP-2、MMP-9、PCNA、Cyclin D1、Cyclin D2和Bcl2蛋白表达降低,P21、MCL-1、Bax和p53蛋白表达升高,并且表现为剂量依赖性,但对Akt蛋白表达无影响;PI3K、mTOR、MMP-2、MMP-9、PCNA、Cyclin D1、Cyclin D2和Bcl2基因表达降低,TP53、MCL-1和Bax基因表达增加。结论 防己诺林碱通过调控MAPK信号通路、增殖和转移、周期和凋亡相关蛋白和基因的表达,从而抑制细胞增殖,诱导细胞凋亡。     

Differential effects of kinase cascade inhibitors on neoplastic and cytokine-mediated cell proliferation.

The Raf/MEK/ERK and PI3K/Akt pathways regulate proliferation and prevent apoptosis, and their altered expression is commonly observed in human cancer due to the high mutation frequency of upstream regulators. In this study, the effects of Raf, MEK, and PI3K inhibitors on conditionally transformed hematopoietic cells were examined to determine if they would display cytotoxic differences between cytokine- and oncogene-mediated proliferation, and whether inhibition of both pathways was a more effective means to induce apoptosis. In the hematopoietic model system employed, proliferation was conditional and occurred when either interleukin-3 (IL-3) or the estrogen receptor antagonist 4-hydroxytamoxifen (4HT), which activates the conditional oncoprotein (DeltaRaf:ER), were provided. Thus, upon the addition of the signal transduction inhibitors and either IL-3 or 4HT, the effects of these drugs were examined in the same cell under 'cytokine-' and 'oncoprotein' -mediated growth conditions avoiding genetic and differentiation stage heterogeneity. At drug concentrations around the reported IC(50) for the Raf inhibitor L-779,450, it suppressed DNA synthesis and induced apoptosis in hematopoietic FDC-P1 cells transformed to grow in response to either Raf-1 or A-Raf (FD/DeltaRaf-1:ER and FD/DeltaA-Raf:ER), but it displayed less effects on DNA synthesis and apoptosis when the cells were cultured in IL-3. This Raf inhibitor was less effective on B-Raf- or MEK1-responsive cells, demonstrating the specificity of this drug. MEK inhibitors also suppressed DNA synthesis and induced apoptosis in Raf-responsive cells and the effects were more significant on Raf-responsive compared to cytokine-mediated growth. The PI3K inhibitor LY294002 suppressed Raf-mediated growth, indicating that part of the long-term proliferative effects mediated by Raf are PI3K dependent. Simultaneous inhibition of both Raf/MEK/ERK and PI3K/Akt pathways proved a more efficient means to suppress DNA synthesis and induce apoptosis at lower drug concentrations.     

贝母素乙通过调控PI3K/Akt信号通路诱导乳腺癌MCF-7细胞凋亡

目的：探究贝母素乙（Peiminine）对乳腺癌细胞MCF-7细胞凋亡的影响及其可能作用机制。方法：采用不同浓度贝母素乙或联合PI3K抑制剂LY294002干预MCF-7细胞,MTT法检测细胞增殖能力;Hoechst33258染色和Annexin V-FITC/PI流式细胞术检测细胞凋亡情况;JC-1染色法检测细胞线粒体膜电位变化;Western blotting检测细胞中PI3K(p110α)、Akt、p-Akt(ser473)、Bad、Bax、Bcl-2、cleaved-Caspase-3以及线粒体和胞浆中细胞色素C(Cyt C)等蛋白表达水平。结果：贝母素乙可呈时间-浓度依赖性抑制MCF-7细胞增殖,诱导细胞出现凋亡形态改变,促进细胞凋亡,并降低线粒体膜电位,上调细胞中Bad、Bax、cleaved-Caspase-3及胞浆中Cyt C蛋白表达水平,下调PI3K(p110α)、p-Akt、Bcl-2和线粒体中Cyt C蛋白表达水平,而Akt蛋白表达水平无显著变化。然而,联合LY294002干预可增强贝母素乙对MCF-7细胞凋亡的促进作用。结论：贝母素乙可诱导乳腺癌MCF-7细胞凋...