膜型基质金属蛋白酶-1在基质金属蛋白酶-2活化中的作用机制

目的:研究MMP-2的活化并探索其机制.方法:采用酶谱分析方法检测瘤细胞条件培养基中MMP-2在包被前后表达和活化的情况,用RT-PCR方法检测MT1-MMP mRNA的表达,观察MT1-MMP激活的MMP-2在细胞侵袭中的作用,Boyden小室膜侵袭实验检测细胞的侵袭能力.结果:条件培养基明胶酶谱分析结果显示仅在三维聚I型胶原包被组存在MMP-2的活性形式;培养于I型胶原组的人MCF-7细胞MT1-MMP mRNA表达量明显高于对照组,与对照组间差异显著(P<0.01).Boyden小室膜侵袭实验可见,用MT1-MMP的抗体处理组的细胞数明显少于未用MT1-MMP的抗体处理组,差异有统计学意义(P<0.01).结论:I型胶原成分可以通过上调MT1-MMP的水平来调控人乳腺癌MCF-7细胞MMP-2的活化,MT1-MMP激活的MMP-2可以增强人乳腺癌MCF-7细胞的侵袭能力.     

非类固醇类抗炎药NS398对肺癌H460细胞MT1-MMP表达的影响

目的:探讨非类固醇类抗炎药NS398对肺癌H460细胞增殖及其膜型基质金属蛋白酶-1(mem-brane type 1-matrix metalloproteinase,MT1-MMP)表达的影响。方法:应用MTT法检测细胞生长抑制率,免疫荧光法检测MT1-MMP蛋白质表达,酶联免疫吸附法(enzyme-linked immunosorbentassay,ELISA)检测细胞培养液中活性基质金属蛋白酶-2(matrixmetalloproteinase-2,MMP-2)的浓度。结果:NS398可抑制H460细胞的增殖及MT1-MMP蛋白质的表达,减少H460细胞培养液中活性型MMP-2的含量,并呈剂量依赖关系。结论:NS398可能通过抑制肺癌细胞MT1-MMP表达及MMP-2的激活而抑制肺癌细胞的侵袭转移。     

弗林蛋白酶抑制剂对乳腺癌MCF-7细胞生长和迁移的影响

目的 探讨乳腺癌转移的机制,为深入研究乳腺癌发生、发展机制提供理论基础.方法 应用不同浓度的弗林蛋白酶（Furin）抑制剂α1-PDX处理乳腺癌MCF-7细胞.用四甲基偶氮唑蓝（MTT）和克隆形成实验检测Furin抑制剂对MCF-7细胞增殖和克隆形成的影响.单层细胞迁移实验和Transwell实验检测MCF-7细胞迁移和浸润能力.Hoechst 33342/PI双染法检测细胞凋亡.酶联免疫吸附法检测细胞培养液中基质金属蛋白酶2（MMP-2）和MMP-9蛋白水平.Western blot检测细胞迁移相关蛋白MT1-MMP、血管内皮生长因子（VEGF）-C和VEGF-D水平.结果 不同浓度α1-PDX作用MCF-7细胞48 h以上时,细胞的生长受到抑制,集落形成降低,细胞凋亡率升高.但在低浓度情况下对细胞迁移和侵袭起抑制作用.α1-PDX降低了细胞内MT1-MMP、VEGF-C、VEGF-D的表达,同时细胞培养液上清中MMP-2和MMP-9浓度也低于对照组.结论 Furin抑制剂通过抑制乳腺癌MCF-7细胞MMP及VEGF表达抑制肿瘤的迁移能力.     

非类固醇类抗炎药NS398对肺癌H460细胞MT1-MMP表达的影响

目的：探讨非类固醇类抗炎药NS398对肺癌H460细胞增殖及其膜型基质金属蛋白酶-1（membrane type 1-matrix metalloproteinase,MT1-MMP）表达的影响。方法：应用MTT法检测细胞生长抑制率,免疫荧光法检测MT1-MMP蛋白质表达,酶联免疫吸附法（enzyme—linked immunosorbentassay,ELISA）检测细胞培养液中活性基质金属蛋白酶-2（matrix metalloproteinase-2,MMP-2）的浓度。结果：NS398可抑制H460细胞的增殖及MT1-MMP蛋白质的表达,减少H460细胞培养液中活性型MMP-2的含量,并呈剂量依赖关系。结论：NS398可能通过抑制肺癌细胞MT1-MMP表达及MMP-2的激活而抑制肺癌细胞的侵袭转移。     

膜型基质金属蛋白酶-1在乳腺癌中表达的预后价值

目的探讨膜型基质金属蛋白酶-1（MT1-MMP）蛋白在乳腺癌中表达的临床意义。方法采用免疫组织化学方法检测106例乳腺癌患者手术标本中MT1-MMP蛋白的表达;用统计学软件SPSS11．0作为统计分析的工具,MT1-MMP表达与临床病理因子的关系用卡方检验和Pearson等级相关分析检验;预后分析采用Kaplan—Meier检验Cox Regression。结果乳腺癌组织中MT1-MMP蛋白表达阳性率为62．3％,表达强度在不同分期和不同淋巴结转移数目患者间差异有统计学意义且呈正相关（P〈0．050）,在不同大小肿瘤间及在ER、PR和HER-2不同表达的患者间差异无统计学意义。MT1-MMP阴性患者与弱至中度阳性或强阳性患者间的无病生存期比较,MT1-MMP（-）为65．0％,MT1-MMP（＋-＋＋）为27．1％,MT1-MMP（＋＋＋）为27．8％,差异有统计学意义（P〈0．050）。不同MT1-MMP免疫组织化学染色强度患者的7年生存率也明显不同,MT1-MMP（-）为77．5％,MT1-MMP（＋-＋＋）为60．4％,MT1-MMP（＋＋＋）为50．0％,差异有统计学意义（P〈0．050）。根据不同分期和不同淋巴结转移状态分层分析发现,MT1-MMP蛋白不同表达强度的患者预后差异有统计学意义（P〈0．050）;根据不同肿瘤大小的分层分析发现,不同MT1-MMP表达强度的T2期和T4期患者预后差别有统计学意义（P〈0．050）,但T1和T3期患者预后没有差别。多因素分析显示MT1-MMP是有意义的预后因子,MT1-MMP强阳性患者死亡风险增加2倍,弱到中度阳性患者死亡风险增加1．3倍。结论MT1-MMP的表达与乳腺癌侵袭转移有关,MT1-MMP是乳腺癌的预后因子。     

人参多糖注射液对人乳腺癌MCF-7细胞侵袭迁移能力的影响及机制研究

目的 探讨人参多糖注射液对人乳腺癌细胞株MCF-7侵袭迁移能力的影响。方法 以不同作用浓度(12.5μL/mL、25μL/mL、50μL/mL、100μL/mL)人参多糖注射液处理MCF-7细胞株,以PBS作为空白对照,分别采用Transwell小室侵袭实验、划痕实验及Western blot检测细胞侵袭能力、迁移能力及基质金属蛋白酶-2(MMP-2)和基质金属蛋白酶-9(MMP-9)表达。结果 人参多糖注射液对MCF-7细胞体外侵袭和迁移能力具有显著的抑制作用,并呈现剂量及时间依赖性。人参多糖注射液处理后,MCF-7细胞MMP-2蛋白表达及MMP-9蛋白表达比值显著降低,并呈现剂量及时间依赖性。结论 人参多糖注射液可显著抑制人乳腺癌细胞MCF-7侵袭能力和迁移能力,下调MMP-2及MMP-9蛋白表达是其可能的作用机制。     

表达MT1-MMP的乳腺癌细胞株对蒽环类药物敏感性研究

目的观察表达MT1-MMP的乳腺癌细胞株对蒽环类化疗药物敏感性的影响。方法用脂质体Lipofectamine 2000将pcDNA3.1-MT1-MMP真核表达载体转染乳腺癌细胞株MDA-MB-453,然后用含G418的培养基筛选获得过表达MT1-MMP的乳腺癌细胞株。蛋白印迹（Western blotting）技术检测MDA-MB-453细胞内MT1-MMP的表达情况。四唑蓝（MTT）法检测各组细胞对化疗药物的敏感性。结果 Western blotting实验证实,重组载体pcDNA3.1-MT1-MMP真核表达载体成功转入乳腺癌细胞内,并稳定过表达MT1-MMP。MTT法检测发现,阿霉素（ADH）、表阿霉素（EPI）、吡喃阿霉素（THP）转染组细胞的抑制率分别为41.38±1.34%、37.69±1.93%和57.96±3.19%,均明显低于未转染组（70.22±2.55%、70.35±1.21%、76.97±2.70%）和空白质粒组（68.94±1.89%、69.43±1.27%、73.06±1.65%,P〈0.05）。结论表达MT1-MMP的乳腺癌细胞株MDA-MB-453对蒽环类化疗药物具有耐药性,MT1-MMP有可能成为一个新的蒽环类化疗药物敏感性预测因子。     

MT1-MMP在乳腺癌组织中的表达及临床意义

背景与目的:近年研究表明,膜型基质金属蛋白酶-1(MT1-MMP)在乳腺癌的浸润和转移中有重要作用.然而,有关MT1-MMP在乳腺癌中表达的临床意义的报道极少.本研究探讨MT1-MMP在乳腺癌组织中的表达及其与乳腺癌临床病理特征的关系.方法:采用免疫组化和半定量RT-PCR的方法检测46例乳腺癌手术后标本中MT1-MMP蛋白和mRNA的表达.结果:MT1-MMP蛋自在46例乳腺癌组织中的阳性率为52.2%,其中在Ⅰ期、Ⅱ期和Ⅲ期中的阳性率分别为12.5%、54.8%和85.7%(P＜0.05);在T1、T2和T3三组中的阳性率分别为11.1%、59.4%和80.0%(P＜0.05);在N0、N1和N2三组中的阳性率分别为27.3%、66.7%和100.0%(P＜0.05).MT1-MMP mRNA在所有的乳腺癌标本中均有表达,其相对表达量的均数在Ⅰ、Ⅱ、Ⅲ期乳腺癌分别为0.473、0.695、0.910(P＜0.05);在T1、T2和T3组中分别为0.524、0.715和0.822(P＜0.05);在N0、N1和N2组中分别为0.630、0.702和0.870(P＜0.05).MT1-MMP蛋白和mRNA表达与ER、PR、c-erbB-2的状况无统计学差异(P＜0.05).结论:MT1-MMP蛋白和mRNA在乳腺癌中的表达与肿瘤分期、肿瘤大小和淋巴结转移呈正相关,有可能作为判断乳腺癌浸润转移能力的参考指标之一.     

膜型基质金属蛋白酶-1上调人乳腺癌细胞血管内皮生长因子的表达并诱导肿瘤血管新生

目的 研究膜型基质金属蛋白酶-1(MT1-MMP)在肿瘤血管新生过程中的作用,探讨其诱导肿瘤血管新生的作用途径.方法 应用基因转染方法 ,将MT1-MMP导入人乳腺癌细胞系MCF-7细胞;应用半定量逆转录聚合酶链反应(RT-PCR)和免疫荧光染色,比较转染前后肿瘤细胞血管内皮生长因子(VEGF)表达的变化;通过裸鼠异种移植瘤模型,检测MT1-MMP对肿瘤生长速度、肿瘤组织微血管密度(MVD)和VEGF表达的影响.结果 在MT1-MMP稳定转染后的MCF-7细胞中,VEGF189、VEGF165和VEGF121 mRNA表达水平显著上调(P＜0.001).免疫荧光检测结果 显示,MT1-MMP组的VEGF蛋白免疫荧光强度为93.8±10.3,明显强于MCF-7组(42.9±5.3)和pcDNA3.1组(41.0±5.4,P＜0.001).裸鼠异种移植瘤模型结果 显示,MTI-MMP能够加快肿瘤生长速度.肿瘤组织MVD检测结果 显示,MT1-MMP能够显著提高肿瘤组织的MVD(P＜0.05).免疫组织化学染色结果 显示,VEGF在MT1-MMP组呈强阳性表达.结论 MT1-MMP能够通过上调肿瘤细胞VEGF表达水平而有效诱导肿瘤血管新生.MT1-MMP的这一作用途径可能为临床抗肿瘤研究及抗肿瘤药物开发提供新思路.     

MT1-MMP反义核酸抑制高转移人卵巢癌SW626细胞的侵袭效应

背景与目的:MT1-MMP(MMP-14)是新发现的一种膜型基质金属蛋白酶,研究表明MT1-MMP在肿瘤转移中发挥关键性作用。本研究应用反义核酸技术,观察了MT1-MMP反义核酸对高转移人卵巢癌SW626细胞体外生长和侵袭的抑制效应。方法:应用自行设计的引物,借助RT-PCR技术获得两端含不同限制酶位点的MT1-MMPcDNA片段,反向插入pcDNA3.1中,并应用脂质体介导的基因转染技术,将重组质粒导入SW626细胞中,应用MTT、Westernblot、明胶酶谱和体外侵袭实验等方法观察了SW626细胞转染前后,细胞生长、MT1-MMP蛋白表达、MMP-2和MMP-9酶活性及细胞体外侵袭能力等指标的变化。结果:成功构建了反义MT1-MMP真核表达载体(pMMP14as),将其转染入SW626细胞后,与空质粒转染组相比,MT1-MMP反义核酸转染组细胞MT1-MMP表达显著降低,抑制率为65.8%;MMP-2酶原的活化受到明显抑制;pMMP14as转染组的穿膜细胞百分数为(63.3±5.8)%,明显低于空质粒转染组(97.6±7.5)(P<0.05)%。结论:MT1-MMP反义核酸可明显抑制高转移SW626细胞体外生长和侵袭效应,提示MT1-MMP可作为人卵巢癌抗侵袭治疗的分子靶点。     

Matrilysin over-expression in MCF-7 cells enhances cellular invasiveness and pro-gelatinase activation

Matrilysin (MMP-7) is over-expressed in various cancers and is thought to play important roles in tumor invasion and metastasis. However, the function of MMP-7 in breast cancer remains unclear. We therefore examined the expression of the MMP-7 gene in breast cancer (MCF-7) cells and the effect of its over-expression on cellular invasion. We transfected human MMP-7 into MCF-7 cells and selected clones that stably over-expressed the MMP-7 gene. The in vitro invasiveness of MCF-7 cells was quantified by use of the Matrigel invasion assay. Expression of MMP-7 mRNA was analyzed by quantitative RT-PCR. MMP secretion and activation were detected by gelatin zymography. We found that MMP-7-expressing clones had significantly increased invasion (P < 0.001), with increased MMP-7 expression and gelatinase activation as compared to the vector controls. We conclude that MMP-7 over-expression correlates with breast cancer in vitro invasiveness and that MMP-7 may promote invasion by increasing the secretion and activation of proMMP-2 and proMMP-9.     

JAK/STAT3和MAPK/ERK在乳腺癌细胞侵袭转移中的交互作用及意义

目的研究应用JAK酶抑制剂AG490对乳腺癌细胞MDA-MB-231 STAT3和ERK磷酸化的影响,初步探讨JAK/STAT3和MAPK/ERK两条信号转导通路的交互作用以及在乳腺癌细胞侵袭转移中的调控意义。方法以JAK酶抑制剂AG490处理乳腺癌细胞MDA-MB-231,Western blot检测细胞中P-STAT3、P-ERK蛋白水平变化;RT-PCR检测细胞中STAT3、ERK1、ERK2mRNA的变化;明胶酶谱法检测细胞分泌MMP-2、MMP-9的变化,Transwell小室进行人工重组基底膜侵袭和运动实验。结果应用JAK酶抑制剂AG490后人乳腺癌细胞MDA-MB-231中P-STAT3、P-ERK蛋白均减少,STAT3、ERK1、ERK2mRNA表达下降,同时可使细胞分泌MMP-2、MMP-9减少,使细胞侵袭、迁移能力降低。结论JAK/STAT3和MAPK/ERK两条信号转导通路之间存在交互作用,通过JAK酶抑制可改变转录因子STAT3和激酶ERK磷酸化水平,进而可以交互影响其基因转录的表达。JAK酶抑制对两条信号转导通路的激活有阻断作用而可以抑制乳腺癌细胞的侵袭转移。     

Invasiveness of breast cancer cells MDA-MB-231 through extracellular matrix is increased by the estradiol metabolite 4-hydroxyestradiol

In malignant breast cancer, estrogen metabolism is altered, favoring the accumulation of hydroxyestradiols, which can generate free radicals. These reactive species can activate matrix metalloproteinases (MMPs), which in turn can hydrolyze the proteins of the extracellular matrix (ECM) that act as a barrier to tumor cell passage. The aim of this study was to determine whether reactive oxygen species generated by 4-hydroxyestradiol (4-OHE(2)) can activate MMP-2 and then enhance the invasiveness of breast cancer cells MDA-MB-231 in vitro. Enzymatic assay and gel zymography demonstrated that 4-OHE(2) at a concentration as low as 10(-8) M led to the conversion of proMMP-2 to active MMP-2. Activation of proMMP-2 by 4-OHE(2) was inhibited by the Cu,Zn-SOD supporting the involvement of the free radical superoxide anion (O(2)(*-)). Using invasion chambers coated with matrigel (artificial ECM), 4-OHE(2) (10(-8) M) enhanced the invasiveness of MDA-MB-231 breast cancer cells by 3-fold. The addition of Cu,Zn-SOD reduced the invasiveness of MDA-MB-231 cells by more than 2-fold, supporting the involvement of O(2)(*-) generated by 4-OHE(2). Addition of an MMP-2 inhibitor completely inhibited the enhancement of invasiveness induced by 4-OHE(2), which demonstrates the importance of activating MMP-2 by 4-OHE(2). On the other hand, estradiol, which does not have a catechol structure, did not generate free radicals, and it could not activate proMMP-2 or enhance the invasiveness of beast cancer cells. Although these data need to be confirmed in an animal model, this study suggests that the accumulation of 4-OHE(2) in breast tumors could enhance the invasiveness of breast cancer cells.     

肿瘤和间质细胞相互作用对肺癌MMP-2和MMP-9表达的影响

 目的 研究三维立体培养中肺癌H460细胞、胚肺成纤维细胞和单核细胞相互作用对MMP-2、MMP-9 表达的影响。 方法 活性胶原三维立体培养分为：H460细胞和胚肺成纤维细胞共同培养组;H460细胞和单核细胞共同培养组;胚肺成纤维细胞和单核细胞共同培养组;H460细胞、胚肺成纤维细胞和单核细胞共同培养组4组。明胶酶谱法测定各组培养基中MMP-2、MMP-9活性。 结果 H460细胞和胚肺成纤维细胞、胚肺成纤维细胞和单核细胞共同培养时MMP-2酶原和活化酶活性和表达均增强,H460细胞和单核细胞共同培养时MMP-2酶原和MMP-9活性和表达增强,H460细胞、胚肺成纤维细胞和单核细胞共同培养MMP-2活化酶和MMP-9活性和表达明显增强。 结论 肺癌H460细胞、胚肺成纤维细胞和单核细胞相互作用能通过上调MMP-2、MMP-9的表达促进肺癌的侵袭和转移。     

Effects of neuregulins on invasion and metastasis of non-overexpression ErbB2 breast cancer cells

Objective: To explore the effects of neuregulins on ErbB2 receptor signal transduction pathway activation, and invasion and metastasis of non-overexpression ErbB2 breast cancer cell MDA-MB-231. Methods: The expressions of neuregulin were detected by immunocytochemistry and Western blot. MDA-MB-231 cells were treated with ErbB2 kinase inhibitor AG825. Proliferations were measured with MTT assay. Invasion and metastasis of MDA-ME-231 cells were evaluated with transwell chamber. The enzyme activities of MMP-2 and MMP-9 were detected by gelatin zymography. The expressions of MMP-2 and HIF-1α were detected by Western blot.Results: MDA-MB-231 cells expressed a relatively higher level of neuregulin. In Western blot, the positive reaction band was found at 44KD which coincides with the molecular weight of NRG. When MDA-MB-231 cells were treated with AG825, the proliferation was inhibited in a time-dose-dependent manner (P＜0.01), invasion and metastasis were also depressed (P＜0.05). The enzyme activities of MMP-2 and MMP-9 were lower (P＜0.05). The expression levels of MMP-2 and HIF-1α were decreased (P＜0.05).Conclusion: Our study indicates that neuregulins are synthesized in MDA-MB-231 cells as transmembrane proteins, neuregulins could activate ErbB2 receptor signal transduction pathway by autocrine or paracrine secretion, and induce invasion and metastasis of MDA-MB-231 cells.     

High Expression of the RECK Gene in Breast Cancer Cells is Related to Low Invasive Capacity

OBJECTIVE To investigate the expression of the RECK gene in human breast (cancer) cell lines, and to determine the relationship between RECK gene expression and the invasive capacity of the breast cancer cell lines. METHODS The invasive capacity of breast (cancer) cell lines including HBL-100, MCF-7 and MDA-MB-435S were determined by the Tran-swell method. The protein expression levels of RECK, MMP-2 and MMP-9 genes in these three cell lines were measured by immunocytochemical methods. The expressions of the RECK gene and protein level were measured by RT-PCR and Western blots in the cell lines respectively. RESULTS The order of the invasive capacity of the breast (cancer) cell lines was MDA-MB-435S, being the highest, and HBL-100, being the lowest. The invasive capacity difference between any two groups among the three groups was significant (P<0.01). The protein expression level of the RECK gene in the HBL-100 cell line was highest, and no expression was detected in MDA-MB-435S cells. Moreover, the expression of the RECK gene was negatively correlated with the expression of the MMP-2 and MMP-9 genes. The mRNA level of the RECK gene in HBL-100 cells was the highest, but no expression was found in the MDA-MB-435S cells (P<0.001). CONCLUSION There was a significant negative correlation between the expression level of the RECK gene and invasive capacity in vitro, and the RECK gene expression showed an inverse proportion to that of the MMP-2, MMP-9 genes.     

Flavonoid baicalein suppresses adhesion,migration and invasion of MDA-MB-231 human breast cancer cells

Baicalein is a widely used Chinese herbal medicine that has been used historically in anti-inflammatory and anti-cancer therapy. However, the molecular mechanism of its anti-cancer activity remains poorly understood and warrants further investigations. The purpose of this study is to verify the activity of baicalein to inhibit the invasion of MDA-MB-231 human breast cancer cells. The results indicated that baicalein suppressed MDA-MB-231 cell adhesion to fibronectin-coated substrate, wound healing migration and invasion through the Matrigel in a concentration-dependent manner. Western blot and gelatin zymography analysis showed that baicalein significantly inhibited the expression and secretion of matrix metalloproteinases 2/9 (MMP-2/9) in MDA-MB-231 cells. Additionally, treatment of MDA-MB-231 cells with baicalein down-regulated the expression of MMP-2/9 involved mitogen-activated protein kinases (MAPK) signaling pathway. Taken together, baicalein had potential to suppress the adhesion, migration and invasion of MDA-MB-231 cancer cells in vitro and it could serve as a promising drug for the treatment of cancer metastasis.     

槲皮素对人结肠癌SW480细胞体外侵袭能力的影响

目的：研究槲皮素对结肠癌SW480细胞的体外侵袭能力的影响,并探讨其可能的作用机制。方法：结肠癌SW480细胞经槲皮素处理后用Transwell小室的方法检测其体外黏附、侵袭和运动能力。明胶酶谱分析法检测SW480细胞分泌的基质金属蛋白酶活性。结果：结肠癌SW480细胞经槲皮素处理后,体外侵袭、运动能力呈剂量依赖性下降,SW480细胞MMP-2及MMP-9的分泌下降（P〈0.05）。结论：槲皮素在体外剂量依赖性地抑制结肠癌SW480细胞的转移能力,这可能与槲皮素抑制MMP-2及MMP-9的分泌有关。     

Expression of Ets-related transcription factors and matrix metalloproteinase genes in human breast cancer cells

The expression levels of ets and MMP genes was examined in two breast cancer cell lines of differing invasive potential. The more invasive MDA-MB-231 cell line had higher levels of Ets-1, Ets-2, PEA3, ERM, Tel, Net, MMP-13 and -14 mRNA than MCF-7 cells. MMP-1, -3 and -16 mRNAs were expressed equally. TPA stimulated MMP-1, -9 and TIMP-1 mRNA expression in both cell lines. MMP-2 and MMP-7 mRNAs were not detected in either cell line. The Ets-1 protein was only detected in MDA-MB-231 cells and its level increased following TPA stimulation. TPA induced MMP-9 activity in MCF-7 cells and increased its activity in MDA-MB-231 cells, however, MMP-2 activity was not detected.     

川楝素对乳腺癌细胞的生长抑制作用

[目的]探讨川楝素对人乳腺癌MDA—MB-453细胞作用及其机制。[方法]取对数生长期的MDA—MB-453细胞,0、6．25、12．50、25．00、50．00、100．00nmol／L川楝素处理,绘制生长曲线。川楝素0、12．5、50nmol／L处理72h后,MTS法检测川楝素对乳腺癌细胞增殖的影响,流式细胞仪检测川楝素对乳腺癌细胞凋亡和细胞周期的影响。[结果]川楝素对乳腺癌细胞有增殖抑制作用．并呈时间剂量依赖性（P〈0．01）。MDA—MB453细胞48h、72h、96h的IC50分别为17．25、22．20和135．69nmol／L。流式细胞分析表明,川楝素诱导乳腺癌细胞的凋亡呈浓度依赖性（P〈0．01）,且阻滞细胞在S期（P〈0．01）,以0、12．50、50．00nmol／L川楝素处理乳腺癌细胞72h后,MDA—MB-453细胞早期凋亡率分别为3．21％、9．64％和20．19％,MDA—MB-453细胞处于细胞周期S期细胞占20．98％、35．92％和45．02％。[结论]川楝素对乳腺癌MDA—MB-453细胞增殖具有抑制作用,其作用机制可能与诱导细胞凋亡和引起S期阻滞有关。