淫羊藿苷通过雌激素受体和p38MAPK信号诱导MC3T3-E1Subclone14细胞的分化

目的观察淫羊藿苷(ICA)对MC3T3-E1Subclone14前体成骨细胞株活力、分化的影响,以及雌激素受体(ER)信号、p38MAPK信号在分化过程中的作用。方法 WST-8方法检测MC3T3-E1Subclone14细胞活力;pNPP法检测细胞碱性磷酸酶活性(ALP);ELISA检测I型胶原(ColI)和骨钙素(BGP);Western印迹法检测p38MAPK的蛋白磷酸化;并分别用ICI182780阻断ER受体或SB203580阻断p38MAPK信号后检测ICA对细胞ALP、Col I、BGP的影响;Western印迹法检测ICI182780阻断ER受体信号后,ICA对p38MAPK蛋白磷酸化的影响。结果 ICA(10-7、10-6、10-5mol/L)对细胞活力与对照组比较,在统计学上无显著差异(P>0.05);ICA可以浓度依赖性的提高细胞的ALP、Col I和BGP和矿化结节数量(P<0.01,P<0.05);ICI182780阻断ER受体信号后,10-5mol/L浓度的ICA促细胞分化的特性明显下降(P<0.01);ICA可以浓度组依赖性的提高细胞p38MAPK的蛋白磷酸的水平(P<0.01);SB203580阻断p38MAPK信号后,10-5mol/L浓度的ICA促分化的特性下降(P<0.01);ICI182780阻断ER受体信号后,10-5mol/L浓度ICA促p38MAPK磷酸化明显减弱(P<0.01)。结论 ICA可以促进MC3T3-E1Subclone14细胞分化,ER受体信号、p38MAPK信号在促分化过程中起着重要作用,ER受体信号通路在p38MAPK信号通路的上游。     

复方接骨中药介导MAPK信号通路促进骨髓间充质干细胞增殖及成骨分化

目的探讨复方接骨中药介导MAPK信号通路对骨髓间充质干细胞(BMSCs)增殖及成骨分化的促进作用。方法取健康雄性SD大鼠60只,随机平均分为实验组和对照组,实验组灌喂复方接骨中药煎剂,对照组灌喂等体积自来水,处理10 d后提取各组大鼠血清。分离BMSCs,利用体积分数为0.1的含药血清及非含药血清单独处理BMSCs 24、48、72 h及联合10μmol/L p38MAPK抑制剂SB203580处理BMSCs 72 h后,MTT检测细胞增殖;RT-PCR及Western印迹检测两组血清单独处理及联合SB203580处理BMSCs 72 h后成骨细胞分化标记基因ALP、BGP、BMP-2的表达;Western印迹检测两组血清处理BMSCs 72 h p38蛋白表达及磷酸化。结果含药血清处理24、48 h,细胞OD值与非含药血清组及对照组相比差异无统计学意义(P>0.05),第72小时含药血清组细胞OD值显著高于对照组及非含药血清组(P<0.01),非含药血清组细胞OD值与对照组相比差异无统计学意义(P>0.05)。两组血清处理72 h后,含药血清处理组ALP、BGP、BMP-2表达及p38磷酸化明显高于对照组及非含药血清组(P<0.01),非含药血清组ALP、BGP、BMP-2表达及p38磷酸化与对照组比较差异无统计学意义(P>0.05),p38总蛋白表达三组差异无统计学意义(P>0.05)。SB203580联合两组血清处理72 h后,非含药血清+SB203580组与SB203580组细胞增殖及ALP、BGP、BMP-2表达差异无统计学意义(P>0.05),明显低于对照组(P<0.01),含药血清+SB203580组细胞增殖及ALP、BGP、BMP-2表达显著高于SB203580组(P<0.01),与对照组差异无统计学意义(P>0.05)。结论复方接骨中药可能通过促进MAPK信号通路促进BMSCs的增殖及成骨分化。     

组织金属蛋白酶抑制因子3重组蛋白诱导小鼠成骨细胞MC3T3-E1凋亡

目的 研究组织金属蛋白酶抑制因子3（TIMP-3）重组蛋白对MC3T3-E1成骨细胞凋亡的影响。方法 细胞存活率和凋亡分别用MTT及ELISA检测。Fas，FasL，Bcl-2，Bax，caspase-3，caspase-8，细胞色素c的表达以及JNK，p38，细胞外信号调节激酶（ERK）1／2的磷酸化水平用Western印迹检测。结果 MTT及ELISA检测提示TIMP-3降低MC3T3-E1细胞存活率，诱导MC3T3-E1细胞凋亡。TIMP-1增加Fas、FasL蛋白表达，对Bax、Bcl-2蛋白表达无影响，但可诱导细胞色素c的释放及caspase-8、caspase-3的活化。TIMP-3促进p38和ERK磷酸化，而PD098059（ERK阻断剂）和SB203580（p38阻断剂）消除p38和ERK的促凋亡作用。结论 TIMP-3诱导MC3T3-E1细胞凋亡的信号途径为凋亡受体Fas介导，并有p38、ERK信号转导途径参与。     

慢病毒介导p38MAPK基因沉默对高糖诱导成骨细胞凋亡的影响

目的 观察p38丝裂原活化的蛋白激酶(MAPK)在高糖诱导的MC3T3-E1成骨细胞凋亡中的作用,并探讨其对凋亡相关信号分子caspase-3、bax及bcl-2表达的影响.方法 构建靶向p38MAPK的shRNA慢病毒载体,将体外培养的MC3T3-E1成骨细胞分为正常对照组(A组)、高糖组(B组)、p38MAPK-shRNA慢病毒转染组(C组)、信号转导阻断剂组(D组)和无关shRNA转染组(E组).RT-PCR检测细胞p38MAPK mRNA的表达,流式细胞术检测细胞凋亡,Western印迹检测p38MAPK、p-p38 MAPK、caspase-3、bax、bcl-2蛋白水平,透射电镜观察细胞超微结构.结果 构建靶向p38MAPK的shRNA慢病毒载体,并成功导入MC3T3-E1成骨细胞.与高糖组和无关转染组相比,p38MAPK-shRNA转染能显著抑制高糖诱导的MC3T3-E1细胞p38MAPK过度活化,明显减少细胞的凋亡(P＜0.01);同时,p38MAPK-shRNA转染及p38MAPK阻断剂明显降低MC3T3-E1细胞中p38MAPK、p-p38MAPK、caspase-3及促凋亡基因bax蛋白表达,上调凋亡抑制基因bcl-2,与高糖组和无关转染组相比,差异有统计学意义(P＜0.01,P＜0.05).结论 慢病毒介导p38MAPK靶向RNA干扰可通过抑制p38MAPK 信号通路的活化,降低p-p38MAPK、caspase-3、bax表达,上调bcl-2表达,最终抑制高糖所诱导的MC3T3-E1成骨细胞的凋亡.

Abstract：

Objective To examine the role of p38MAPK in high glucose-induced apoptosis of osteoblast MC3T3-E1 cell line, and to investigate its effect on the expressions of apoptosis-related molecules including caspase3, bax, and bcl-2. Methods The lentiviral vector containing short hairpin RNA targeting p38MAPK was constructed. The cultured osteoblast MC3T3-E1 cell were divided into 5 groups:normal control group(A group), high glucose group(B group), p38MAPK-shRNA transfection group(C group), signal transduction inhibitor group(D group), and transfection with negative control siRNA group(E group). RT-PCR was used to determine the p38MAPK mRNA expression levels in MC3T3-E1 cells. Flow cytometry(FCM)was employed to detect the cell apoptotic percentage. The protein levels of apoptosis-related molecules p38MAPK, p-p38MAPK, caspase-3, bax, and bcl-2 were assayed by Western blot. Ultrastructural alternation of MC3T3-E1 cell was observed under transmission electron microscopy(TEM). Results The lentiviral vector containing short hairp in RNA targeting p38MAPK was successfully constructed and transfected into MC3T3-E1 cells. RT-PCR result suggested that the siRNA targeting p38MAPK could effectively reduce the p38MAPK mRNA expression level induced by high glucose in MC3T3-E1 cell line. FCM showed siRNA significantly decreased high glucose-induced apoptosis percentage of MC3T3-E1 cells(P＜0.01). Meanwhile, we also found the siRNA significantly attenuated the proteins levels of p38MAPK, p-p38MAPK, caspase-3, and gene bax induced by high glucose in MC3T3-E1 cells, whereas the protein level of gene bcl-2 was enhanced remarkably when compared with high glucose group and negative control siRNA group(P＜0.01, P＜0.05).Conclusion The iRNA targeting p38MAPK suppressed high glucose-induced MC3T3-E1 cell apoptosis via inhibiting the activation of p38MAPK signaling pathway, thereby reducing the expressions levels of p-p38MAPK, caspase-3 and gene bax, and up-regulating the level of gene bcl-2.     

活化蛋白1在高糖诱导MC3T3-E1成骨细胞凋亡中的作用

目的观察活化蛋白1(AP-1)在高糖诱导MC3T3-E1成骨细胞凋亡中的作用。方法将体外培养的MC3T3-E1细胞分为正常对照组和实验组,实验组包括22.0 mmol/L D-葡萄糖组(高糖组)、P38MAPK-shRNA慢病毒转染组、P38MAPK信号转导阻断剂组、无关shRNA转染组、AP-1抑制剂SP600125组。采用TUNEL和流式细胞术检测细胞凋亡,用EMSA检测MC3T3-E1细胞AP-1的活性。结果与正常对照组相比,高糖组MC3T3-E1成骨细胞P38MAPK表达、AP-1活性、细胞凋亡显著增加。P38MAPK-shRNA慢病毒转染组和P38MAPK信号转导阻断剂组MC3T3-E1细胞AP-1活性较高糖组分别下降57.9%(P0.01)和45.6%(P0.05)。AP-1抑制剂组MC3T3-E1细胞凋亡率较高糖组下降39.7%(P0.01)。结论高糖通过激活P38MAPK增加AP-1活性,诱导MC3T3-E1成骨细胞凋亡,抑制AP-1活性后高糖诱导的MC3T3-E1细胞凋亡显著下降。     

p38MAPK信号通路的抑制减轻缺氧复氧环境下心肌细胞凋亡

目的研究p38丝裂原活化蛋白激酶(p38MAPK)信号通路抑制剂对缺氧复氧诱导的心肌细胞凋亡的影响。方法心肌细胞H9C2分为对照组(Con组)、缺氧复氧组(H/R组)、p38MAPK信号通路抑制剂SB203580组(SB203580组),Con组细胞正常培养,H/R组、SB203580组进行缺氧复氧处理,SB203580组细胞在缺氧前用p38MAPK信号通路抑制剂SB203580预处理24 h。噻唑蓝(MTT)检测细胞存活情况,流式细胞术检测细胞凋亡,二硝基苯肼显色法检测上清中乳酸脱氢酶(LDH)含量,用硫代巴比妥酸比色法检测细胞中丙二醛(MDA)含量,用黄嘌呤氧化法检测细胞中超氧化物歧化酶(SOD)含量,二氯二氢荧光素-乙酰乙酸酯(DCFH-DA)法检测细胞中活性氧(ROS)含量,Western blot检测细胞中p38MAPK、磷酸化p38MAPK(p-p38MAPK)、活化的含半胱氨酸的天冬氨酸蛋白水解酶3(Cleaved Caspase-3)蛋白表达。结果 H/R组、SB203580组细胞存活率低于Con组,凋亡率高于Con组,细胞中MDA、ROS含量高于Con组,培养液上清中LDH高于Con组,细胞中SOD含量低于Con组,细胞中p-p38MAPK、Cleaved Caspase-3蛋白水平高于Con组。SB203580组细胞存活率高于H/R组,凋亡率低于H/R组,细胞中MDA、ROS含量低于H/R组,培养液上清中LDH低于H/R组,细胞中SOD含量高于H/R组,细胞中p-p38MAPK、Cleaved Caspase-3蛋白水平低于H/R组。结论 p38MAPK信号通路抑制剂能够减轻缺氧复氧环境下心肌细胞凋亡和氧化损伤。     

SH-SY5Y细胞p38 MAPK信号转导通路对α7尼古丁受体蛋白水平的影响

目的研究p38 MAPK信号传导通路激动及抑制对SH-SY5Y细胞α7神经型乙酰胆碱受体(n AChR)蛋白水平的影响并探讨受体蛋白与p38通路之间的关系。方法分别用p38 MAPK激活剂Anisomycin和p38 MAPK阻断剂SB203580激动和阻断SH-SY5Y细胞p38 MAPK通路蛋白的活化及其表达,Western印迹方法检测α7 n AChR蛋白水平。结果细胞经Anisomycin处理后,p38 MAPK蛋白表达不变,p-p38 MAPK(Thr180/Tyr182)蛋白水平升高了71%(P<0.01),同时细胞α7 n AChR蛋白表达升高了80%(P<0.01).细胞经SB203580处理后,p38 MAPK蛋白表达不变,p-p38 MAPK(Thr180/Tyr182)蛋白水平降低了62%(P<0.01),提示p38 MAPK信号通路被抑制,同时细胞α7 n AChR蛋白表达降低了80%(P<0.01)。结论 Anisomycin能激动SH-SY5Y细胞p38 MAPK信号转导通路,引起α7 n AChR蛋白表达明显增强;SB203580能阻断SH-SY5Y细胞p38 MAPK信号转导通路,引起α7 n AChR蛋白水平显著降低。     

p38信号通路在内皮细胞微粒诱导人脐静脉内皮细胞表达细胞间黏附分子-1中的作用

目的观察p38信号通路（P38MAPK）在内皮细胞微粒（EMPs）诱导人脐静脉内皮细胞（HU—VECs）表达细胞间黏附分子-1（ICAM-1）中的作用。方法将体外培养的HUVECs随机分组：①EMPs不同时点观察组：用EMPs（终浓度105／m1）分别刺激细胞0、3、6、12、24h;②EMPs不同剂量作用组：分别用终浓度为0、10^2、10^3、10^4、10^5／ml的EMPs刺激细胞24h;③EMPs＋p38MAPK特异性抑制剂SB203580组：在EMPs（终浓度10^5／ml）刺激前,与终浓度为5μmol／L的SB203580共同孵育30min。用蛋白免疫印迹法（Western blot）测定p38MAPK磷酸化表达,实时荧光定量PCR测定ICAM—1mRNA的表达。结果EMPs可激活p38MAPK,使磷酸化p38MAPK蛋白表达量及ICAM—1mRNA表达量增加,且呈剂量和时间依赖性。p38MAPK特异性拈抗剂SB203580可显著抑制EMPs的此作用。结论p38信号通路可能部分参与了对EMPs诱导HUVECs表达ICAM-1的调控。     

硫化氢在p38MAPK信号通路对大鼠肝星状细胞凋亡中的作用

目的探讨硫化氢(H2S)在p38MAPK信号通路对大鼠肝星状细胞(hepatic stellate cell,HSC)凋亡中的作用及磷酸化P38、Caspase-3蛋白表达的变化。方法实验设对照组(HSC加含10%胎牛血清的DMEM培养液)、二甲基亚砜(DMSO)组(对照组基础上加DMSO,使其终浓度为0.1%)、NaHS组(对照组基础上加NaHS,使其终浓度为50μmol/L)、SB组(DMSO组基础上加SB203580,使其终浓度为75μmol/L)、SB加NaHS(SB+NaHS)组;采用Hoechst荧光染色检测细胞凋亡;Western blotting法检测磷酸化p38MAPK表达及Caspase-3蛋白表达水平。结果与对照组比较,SB组和SB+NaHS组HSC-T6的凋亡率增加(P0.05),NaHS组p38MAPK磷酸化水平及Caspase-3表达均明显增高(P0.01);与NaHS组比较,SB组和SB+NaHS组细胞凋亡率增加明显(P0.01),p38MAPK磷酸化水平表达降低(P0.01);SB+NaHS组较SB组Caspase-3蛋白表达升高(P0.05)。结论 p38MAPK及Caspase-3在H2S刺激的HSC-T6中表达增强,H2S能促使SB203580诱导的HSC-T6细胞凋亡,其作用机制可能与活化p38MAPK的磷酸化途径,进而激活Caspase-3的表达有关。     

硫化氢在外源性SB203580预处理人卵巢癌SKOV3细胞增殖中的作用

目的探讨硫化氢(H2S)供体硫氢化钠(Na HS)对人卵巢癌SKOV3细胞增殖的影响及可能机制。方法体外培养SKOV3细胞,随机分为正常对照组、Na HS组、SB203580组、Na HS+SB203580组,采用四甲基偶氮唑蓝(MTT)法检测各组SKOV3细胞增殖,流式细胞术检测各组SKOV3细胞周期分布,Western印迹检测各组SKOV3细胞中P-p38MAPK蛋白表达。结果与正常对照组比较,Na HS组SKOV3细胞增殖明显增加,G1期细胞明显减少,S期细胞明显增加,且p-p38MAPK表达明显增加(均P<0.01);SB203580组、Na HS+SB203580组SKOV3细胞增殖均明显减少,G1期细胞均明显增加,S期细胞均明显减少,且p-p38MAPK表达均明显降低(均P<0.01)。而与Na HS组比较,SB203580组、Na HS+SB203580组SKOV3细胞增殖均明显减少,G1期细胞均明显增加,S期细胞均明显减少,且p-p38MAPK表达均明显降低(均P<0.01);与SB203580组比较,Na HS+SB203580组SKOV3细胞的增殖明显增加,G1期细胞明显减少,S期细胞明显增加,且p-p38MAPK表达明显增加(均P<0.01)。结论 H2S可能通过活化p38MAPK信号通路促进SKOV3细胞增殖。     

ErbB-3 mediates phosphoinositide 3-kinase activity in gefitinib-sensitive non-small cell lung cancer cell lines

Therapies that target the EGF receptor (EGFR), such as gefitinib (IRESSA), are effective in a subset of patients with advanced non-small cell lung cancer (NSCLC). The differences in intracellular signaling networks between gefitinib-sensitive and -resistant NSCLCs remain poorly understood. In this study, we observe that gefitinib reduces phospho-Akt levels only in NSCLC cell lines in which it inhibits growth. To elucidate the mechanism underlying this observation, we compared immunoprecipitates of phosphoinositide 3-kinase (PI3K) between gefitinib-sensitive and -resistant NSCLC cell lines. We observe that PI3K associates with ErbB-3 exclusively in gefitinib-sensitive NSCLC cell lines. Gefitinib dissociates this complex, thereby linking EGFR inhibition to decreased Akt activity. In contrast, gefitinib-resistant cells do not use ErbB-3 to activate the PI3K/Akt pathway. In fact, abundant ErbB-3 expression is detected only in gefitinib-sensitive NSCLC cell lines. Two gefitinib-sensitive NSCLC cell lines with endogenous distinct activating EGFR mutations (L858R and Del747-749), frequently observed in NSCLC patients who respond to gefitinib, also use ErbB-3 to couple to PI3K. Down-regulation of ErbB-3 by means of short hairpin RNA leads to decreased phospho-Akt levels in the gefitinib-sensitive NSCLC cell lines, Calu-3 (WT EGFR) and H3255 (L858R EGFR), but has no effect on Akt activation in the gefitinib-resistant cell lines, A549 and H522. We conclude that ErbB-3 is used to couple EGFR to the PI3K/Akt pathway in gefitinib-sensitive NSCLC cell lines harboring WT and mutant EGFRs.     

Vasopressin stimulation of mouse 3T3 cell growth.

Vasopressin is shown to be a potent mitogen for Swiss 3T3 cells. The hormone (1--10 ng/ml) causes a striking shift of the dose--response curve for the effect of serum on thymidine incorporation by cultures of 3T3 cells arrested in the G1/G0 phase of the cell cycle. In the absence of added serum, the effect of vasopressin on DNA synthesis is greatly potentiated by insulin, epidermal growth factor, and a factor isolated from medium conditioned by simian virus 40-infected baby hamster kidney cells. The mitogenic effect of vasopressin is dependent on time and hormone concentration. In the presence of insulin, the half-maximal effect elicited by the peptide is obtained at 0.6 ng/ml. [Arg]Vasopressin and [Lys]vasopressin are equally potent. The vasopressins are 10(3)-fold more potent than oxytocin. In the presence of a low (2.5%) concentration of serum, vasopressins stimulate cell proliferation.     

突变的大肠癌线粒体DNA转染NIH3T3及LST细胞的研究

目的了解大肠癌细胞株（SW480，LOVO，HT29）线粒体DNA的突变，克隆突变的大肠癌线粒体DNA（mtDNA）基因，构建peDNA3．1（＋）-mtDNA真核表达重组体，并导入NIH3T3及LST细胞，以探讨线粒体基因突变与肿瘤发生的关系。方法提取大肠癌细胞株（SW480，LOVO，HT29）mtDNA，扩增D—LOOP区，产物用DNA自动测序法进行序列分析。利用DNA重组技术将其定向插入真核表达质粒peDNA3．1（＋），并用脂质体法导人NIH3T3及LST细胞。用MitoCa．ptureMitochondrialApoptosisDetectionKit试剂盒染色后用流式细胞仪及荧光显微镜检测转染细胞的凋亡情况。扩增并测序分析转染细胞的D—LOOP区突变特点。结果检测出大肠癌细胞株SW480，LOVO，HT29细胞mtDNAD—LOOP分别有10，9，8个突变位点。转染前后，各组间细胞凋亡无明显变化。转染细胞的核基因组可扩增出目的基因及Neo基因。4株NIH3T3转染细胞mtDNAD-环区分别检测到9，11，8，4个突变点，并相应有3，4，3，2个多态性变化。结论（1）转染突变的大肠癌细胞mtDNA后转染细胞的mtDNA均可发生多处的突变位点。（2）通过转染后突变的外源性的mtDNA可以整合到核基因组内。（3）突变的mtDNA转染LST细胞及NIH3T3细胞后，不影响转染细胞的凋亡改变。（4）mtDNA的突变可能通过影响体细胞mtDNA的突变和通过外源性mtDNA在核内的整合从而影响癌基因或抑癌基因的表达异常，从而参与肿瘤的发生发展。     

Role of insulin in growth hormone-stimulated 3T3 cell adipogenesis

The role of insulin during GH-stimulated adipogenesis of 3T3-F442A fibroblasts was investigated. Adipogenesis in defined medium (DM), as quantified by the level of glycerol-3-phosphate dehydrogenase activity, revealed that there existed a strict requirement for both insulin and GH during adipogenesis. The concentration of insulin required to elicit half-maximal adipogenesis was approximately 20 nM. Insulin-like growth factor I was less effective than insulin in promoting adipogenesis, indicating that insulin action during differentiation was most likely mediated through the insulin receptor. Cellular viability was not compromised by the absence of insulin, as judged by colony-forming efficiency or trypan blue exclusion. Deletion of insulin from DM supplemented with 1 nM recombinant human GH reduced glycerol-3-phosphate dehydrogenase activity to uninduced levels. Removal of other individual DM constituents did not have this effect. The growth factors fibroblast growth factor, platelet-derived growth factor, and bombesin did not substitute for insulin during GH-stimulated adipogenesis. The characteristic increase in cell number observed during serum-based differentiation, reflecting clonal expansion of young adipocytes, did not occur in DM supplemented with insulin, and insulin-like growth factor I were necessary for this event. These results suggest that insulin functions in concert with GH as a coinducer of the differentiating signals.     

Vav3 is regulated during the cell cycle and effects cell division

Vav3 is a member of the family of guanine nucleotide exchange factors implicated in the regulation of Rho GTPases. Although the exact in vivo function of Vav3 is unknown, evidence from several studies indicates a role distinct from Vav2 or Vav1. Here we report that the expression of Vav3 is regulated during the cell cycle. Strikingly, Vav3 was transiently up-regulated in HeLa cells during mitosis, whereas enforced expression of Vav3 perturbed cytokinesis and led to the appearance of multinucleated cells. These effects of Vav3 were RhoA-dependent, required phosphorylation of the regulatory tyrosine 173, but were not enhanced by N-terminal truncations. Thus, this report establishes that expression of Vav3 is strictly regulated in a cell cycle-dependent manner and implicates Vav3 in the control of cytokinesis.     

二甲双胍对人胰腺癌细胞迁移的抑制作用

目的:研究二甲双胍对胰腺癌细胞迁移的影响,并初步探讨可能机制.方法:体外培养人胰腺癌细胞株Bxpc-3,予二甲双胍进行干预作为实验组(M组),无药物组作为对照组(C组).MTT检测二甲双胍对Bxpc-3细胞存活率的影响,细胞划痕实验检测划痕愈合率,RT-PCR检测MMP-2、MMP-9 mRNA的表达,Elisa检测细胞培养上清液MMP-2、MMP-9蛋白的分泌量.结果:与对照组相比,MTT结果示二甲双胍可以抑制人胰腺癌细胞株Bxpc-3的增殖,并呈时间-浓度依赖性(F=8.991,124,114.61,P<0.01);划痕实验示二甲双胍干预组12、24、48h与对照组相比划痕愈合率显著下降(t=7.683,9.013,10.471,P<0.01);RT-PCR示二甲双胍干预组MMP-2、MMP-9mRNA的表达显著降低(t=16.563,28.494,P<0.01);Elisa示二甲双胍干预组MMP-2、MMP-9蛋白分泌明显下降(t=9.428,13.542,P<0.01).结论:二甲双胍能显著抑制人胰腺癌细胞株Bxpc-3的增殖及迁移,其主要机制可能与抑制MMP-2、MMP-9活性有关.