骨形态发生蛋白-2对人脐带间充质干细胞增殖和分化的影响

目的 观察骨形态发生蛋白-2(BMP-2)对人脐带间充质干细胞(hUCMSCs)增殖和分化的影响.方法 体外培养hUCMSCs,在培养基中加入20 mg/L BMP-2,噻唑蓝(MTT)比色法观察BMP-2对hUCMSCs的增殖效果,流式细胞术检测BMP-2作用后细胞表面STRO-1的表达,逆转录-聚合酶链反应(RT-PCR)测量BMP-2作用后hUCMSCs骨桥蛋白(OPN)、碱性磷酸酶(ALP)、Ⅰ型胶原蛋白(COL1)的mRNA表达变化,碱性磷酸酶染色观察hUCMSCs在BMP-2培养基作用下ALP染色变化,Von kossa染色实验观察BMP-2对hUCMSCs钙结节的形成.结果 细胞在未加BMP-2和加BMP-2培养基中培养1、3、5、7 d,虽然细胞的增殖率上升,但各组间比较差异无统计学意义(P＞0.05),同时发现在2%血清的培养基中培养7 d后,hUCMSCs的增殖促进约10%左右.BMP-2培养7 d后细胞表面STRO-1阳性细胞比例上升明显,由25.1±4.0上升至51.1±6.4,差异有统计学意义(P＜0.01).BMP-2培养条件下COL1 mRNA的表达增强,差异有统计学意义(P＜0.05),OPN mRNA出现表达,ALP mRNA比无BMP-2培养明显增强,差异有统计学意义(P＜0.05).在BMP-2培养条件下ALP染色出现大片细胞阳性染色.在培养28 d,Von kossa染色出现明显的钙结节.结论 BMP-2对hUCMSCs成骨诱导分化作用明显,而增殖作用很弱.     

骨形态发生蛋白2基因转染的兔骨髓间充质干细胞复合聚乳酸-聚己内酯支架体外构建载基因仿生骨的实验研究

[目的] 构建聚乳酸-聚己内酯(PLA/PCL)吸附骨形态发生蛋白2(bone morphogenetic protein-2,BMP-2)基因的聚乙二醇(PEG)纳米复合物形成生物可降解仿生骨材料,接种兔骨髓间充质干细胞(rabbit bone mes-enchymal stem cells,rBMSCs),检测BMP-2基因的转染情况及其对细胞增殖、分化的影响.[方法] 通过溶液共混法制备PLA/PCL载基因仿生骨,接种rBMSCs细胞于仿生骨之上,培养48 h;Real-time PCR检测转染后细胞BMP-2及骨钙素mRNA表达水平;应用Western Blot及免疫组化检测rBMSCs转染后BMP-2蛋白表达;免疫荧光检测rBMSCs细胞Ⅰ型胶原蛋白表达;ELISA检测转染后细胞培养上清中分泌BMP-2浓度,同时检测细胞内碱性磷酸酶活性,从而分析细胞分化情况;流式细胞检测转染BMP-2后细胞周期的变化.[结果] 以未转染细胞作为对照,免疫组化表明转染后细胞内BMP-2表达量明显上调(P＜0.05);Real-time PCR检测结果表明BMP-2与骨钙素mR-NA表达显著增加(P＜0.05);同时Western Blot结果同免疫组化结果相似,BMP-2也有明显上调(P＜0.01);免疫荧光检测Ⅰ型胶原表达量显著上升(P＜0.01);ELISA检测细胞培养上清中BMP-2分泌量也有增加(P＜0.05);碱性磷酸酶较对照组相比活性显著增强(P＜0.05),而流式细胞检测S期细胞无明显变化(P＞0.05).[结论] 载基因仿生骨具有稳定而安全的转染性能,其转染后对rBMSCs细胞的分化效果是明显的,而对于细胞周期变化的影响并不显著.     

17-β雌二醇对人成骨样细胞系MG 63 Cbfa 1表达的影响

目的 研究17-β雌二醇对人成骨肉瘤MG 63细胞株Cbfa 1表达的影响,了解雌激素预防骨质疏松的机制中有无Cbfa 1 的参加.方法 17-β雌二醇10-mol/L、10-8mol/L、10-10 mol/L浓度干预人成骨肉瘤MG 63细胞株,24、48 h后抽提RNA、蛋白,半定量RT-PCR,Westem blot检测Cbfa 1 mRNA、蛋白表达的变化.结果 人成骨肉瘤MG 63细胞中有Cbfa 1 mRNA和蛋白的表达.17-β雌二醇10-6mol/L、10-8 mol/ L、10-10 mol/L浓度作用24或48 h,对MG 63细胞的Cbfa 1 mRNA和蛋白表达无影响.结论 人成骨肉瘤MG 63细胞株中有Cbfa 1表达,17-β雌二醇对MG 63细胞Cbfa 1基因的表达无影响.     

巨噬细胞移动抑制因子过表达对成骨细胞骨形态蛋白-2和血管内皮生长因子表达的影响

目的 观察巨噬细胞移动抑制因子(MIF)在成骨细胞中的表达及其对成骨细胞骨形态蛋白-2(BMP-2)和血管内皮生长因子(VEGF)表达的影响.方法 提取5例人髂骨成骨细胞,PcDNA3.0构建MIF过表达系统导入成骨细胞中,检测MIF、BMP-2和VEGF的表达.结果 MIF的稳定转染使成骨细胞的MIF过表达(P＜0.05).MIF基因mRNA和蛋白表达在转染组的表达量显著高于对照组中的表达量(P＜0.05);VEGF和BMP-2的mRNA和蛋白的表达量在转染组也明显增高(P＜0.05).结论 MIF过表达在成骨细胞中上调VEGF和BMP-2的表达.     

熊果酸对人骨肉瘤细胞U2-OS增殖及凋亡的影响研究

目的探讨熊果酸对人骨肉瘤细胞U2-OS增殖以及凋亡的影响,分析其作用机制。方法取人骨肉瘤细胞株U2-OS分为4组,分别采用浓度为0、10、20、40μmol/L的熊果酸进行培养。培养0、24、48、72 h,应用细胞计数试剂盒8(cell counting kit 8,CCK-8)检测细胞增殖能力变化;培养48 h,使用流式细胞术测定熊果酸对骨肉瘤细胞周期和凋亡的影响,应用实时荧光定量PCR和Western blot检测周期蛋白cyclin D1的表达和凋亡相关蛋白Caspase-3的表达和活化情况。结果 CCK-8检测示,培养0、24 h时各组吸光度(A)值比较,差异无统计学意义(P0.05);48、72 h时随浓度增加A值逐渐减小,各组间比较差异均有统计学意义(P0.05)。流式细胞术检测示,随熊果酸浓度增加,U2-OS细胞的G_1期增加、S期及G_2/M期减少,细胞凋亡率逐渐增加,各组间比较差异均有统计学意义(P0.05)。与0μmol/L组相比,10、20、40μmol/L组cyclin D1 m RNA及蛋白相对表达量下调(P0.05);各组间Caspase-3 m RNA相对表达量比较差异无统计学意义(P0.05);但随熊果酸浓度增加,Caspase-3前体蛋白下降,活化的Caspase-3增加,各组间差异均有统计学意义(P0.05)。结论熊果酸能有效抑制U2-OS细胞增殖,诱导cyclin D1表达下调导致细胞在G_0/G_1期阻滞,同时使Caspase-3活化增加进而促进细胞凋亡。     

过氧化物酶体增殖活化受体γ激动剂罗格列酮对MG63细胞抑制生长及促进凋亡的作用

目的 观察过氧化物酶体增殖活化受体γ(PPARγ)激动剂罗格列酮对骨肉瘤细胞株MG63的生长抑制及诱导凋亡作用.方法 取人骨肉瘤MG63细胞,用终质量浓度为0.5、5.0、50.0、100.0 μmol/L罗格列酮分别处理细胞,对照组不给予药物,噻唑蓝(MTT)比色法测定药物作用24、48、72 h对细胞生长的抑制率;流式细胞术(FCM)检测终质量浓度0、0.5、5.0、50.0 μmol/L罗格列酮处理24、48 h细胞周期分布;TUNEL法检测终质量浓度0.5μmol/L罗格列酮处理48 h的细胞凋亡,并计算凋亡指数(AJ).结果 细胞生长抑制率:(1)罗格列酮各浓度作用24、48、72 h,2个时间点抑制率两两比较的差异均有统计学意义(P＜0.01),有随时间增长而增加的趋势,其中0.5μmol/L对细胞的抑制率(％)分别为30.10±0.01、46.70±0.01和48.80±0.02;(2)在各时间点,各浓度组间比较差异均有统计学意义(P＜0.01),在0.5～50.0 μmol/L浓度组区间,相同时间点的抑制率有随浓度升高而降低的趋势.细胞周期:(1)不同浓度的各细胞周期分布差异有统计学意义(P＜0.01).在24、48h时间点均表现为用药组G0/G1期细胞比例高于对照组,0.5mol/L组细胞比例最高,但随用药浓度增加,G0/G1期比例有下降趋势;用药组S期细胞比例均低于对照组,随用药浓度增加,S期比例有增高趋势;即用药可将细胞周期阻滞在G0/G1期的作用;(2)不同时间点间细胞周期分布变化的差异无统计学意义(F=0.36,P＞0.05).细胞凋亡:0.5 μmol/L组凋亡率(14.33±3.35)％明显高于对照组(2.82±0.63)％(P＜0.01),光镜下可见药物组细胞核固缩及散在的凋亡小体.结论 PPARγ激动剂罗格列酮能明显抑制人骨肉瘤MG63细胞的增殖,诱导该细胞G1期阻滞和细胞凋亡.     

rhIGF-Ⅰ联合体外冲击波对成骨细胞影响的实验研究

目的 探讨重组人胰岛素样生长因子Ⅰ(recombinant human insulin-like growth factor-1,rhIGF-Ⅰ)联合体外冲击波(extracorporal shock wave,ESW)对成骨细胞的影响.方法 体外培养人成骨肉瘤细胞株(MG63)制备细胞悬液(1×106cells/ml),实验组分别经ESW、rhIGF-Ⅰ、ESW联合rhIGF-Ⅰ处理,对照组不处理,检测细胞增殖和测定BMP-2含量.结果 与对照组和单独ESW组及rhIGF-Ⅰ组相比,ESW和rhIGF-1联合作用,对MG63细胞的促增值和分泌BMP-2作用明显.结论 ESW与rhIGF-Ⅰ联合应用对促进MG63细胞增值及分泌BMP-2具有协同作用.     

川芎嗪对膝骨性关节炎大鼠软骨BMP-2、Smad1及BMP-2mRNA、Smad1mRNA表达的影响

目的观察川芎嗪治疗膝骨关节炎(knee osteoarthritis,KOA)大鼠模型关节软骨中骨形态发生蛋白-2(bone morphogenetic protein-2,BMP-2)、Smad1表达的变化,并探讨川芎嗪治疗KOA的作用机制。方法制作大鼠膝关节炎模型,将建模成功的大鼠纳入模型对照组,常规饲养,川芎嗪高剂量组、川芎嗪低剂量组、阳性对照组行灌,正常组和模型组行等量生理盐水治疗6 w,实验结束后,各组大鼠分别行HE切片软骨Mankin评分、Western Blot检测软骨组织BMP-2、Smad1及实时荧光定量PCR检查BMP-2mRNA、Smad1mRNA的变化。结果各组软骨Mankin评分中,川芎嗪各剂量组和阳性对照组均较空白组高(P0.05),均较模型组低(P0.05),且川芎嗪高剂量组阳性对照组川芎嗪低剂量组(P0.05)。正常组、川芎嗪各剂量组及阳性对照组中软骨BMP-2、Smad1及BMP-2mRNA、Smad1mRNA相对表达量较模型组均高于模型组,差异有统计学意义(P0.05);与阳性对照组相比,川芎嗪高剂量组BMP-2、Smad1及BMP-2mRNA、Smad1mRNA表达量明显高于阳性对照组(P0.05),而川芎嗪低剂量组其表达则均低于阳性对照组。结论川芎嗪可能通过上调早期KOA大鼠BMP-2mRNA及Smad1mRNA基因的表达,从而促进BMP-2及Smad1蛋白的表达,这可能是在某种程度上减轻关节软骨退变、修复软骨损伤作用的机制之一。     

人骨形态发生蛋白2腺病毒表达载体转染人骨髓基质干细胞和对其增殖及分化的影响

目的：研究人骨形态发生蛋白-2腺病毒表达载体(Ad-BMP-2)转染人骨髓基质干细胞(hBMSC)对其增殖及分化的影响。方法：利用免疫组化、原位杂交染色和蛋白印迹法检测转染后细胞。BMP-2的表达。流式细胞仪和ALP活性测定分析BMP-2基因转染对细胞增殖、分化的影响。结果：转染后，hBMP-2基因在mRNA水平和蛋白水平均有表达。蛋白印迹法检测到培养液中有BMP-2蛋白阳性表达，S期细胞比例和ALP活性明显增高。结论：Ad-BMP-2可高效转染hBMSC，且促进细胞增殖和成骨转化。     

甲氨蝶呤对人骨肉瘤MG-63细胞凋亡及28Livin和Caspase-3表达的影响

目的 观察甲氨蝶呤(MTx)对人骨肉瘤MG-63细胞凋亡及Livin和Caspase-3表达的影响.方法 体外培养骨肉瘤MG-63细胞株,用0、50、100、200和400μmol/L的MTX作用于骨肉瘤MG-63细胞24、48、72 h后,用噻唑蓝(MTT)比色法检测骨肉瘤MG-63细胞的增殖活性,用流式细胞仪测细胞的凋亡率,用Western blot检测不同浓度MTX作用于骨肉瘤MG-63细胞24 h后各组细胞的Livin和Caspase-3蛋白表达水平.结果 随MTX浓度增加骨肉瘤MG-63细胞的增殖活性降低,同时细胞的凋亡率增加(P＜0.05),随MTX浓度增加各组细胞中Livin蛋白的表达降低,Caspase-3蛋白表达增加(P＜0.05).结论 MTX诱导人骨肉瘤MG-63细胞凋亡,其机制可能与下调Livin表达继而上调Caspase-3表达有关.

Abstract：

Objective To observe the effect of Methotrexate (MTX) on apoptosis and expression of Livin and Caspase-3 in human osteosarcoma cell line MG-63. Methods After treatment of MG-63 cells with MTX at different concentrations (0, 50, 100,200,400 μmol/L) for 24, 48 and 72 h, methyl thiazol tetrazolium(MTT) assay was used to observe the growth inhibition of MG-63. The apoptosis was assessed by flow cytometry. The protein expression of Livin and Caspase-3 was detected by Western blotting. Results When MTX was added, growth inhibition and increased apoptosis of MG-63 cells were detected,which was showed in a dose- and time-dependent manner. MTX also down-regulated the level of the protein expression of Livin (P＜0.05), and elevated the protein expression of Caspase-3 (P＜0.05). Conclusion MTX can induce apoptosis of MG-63 cells, by down-regulating Livin expression and subsequently up-regulating Caspase-3 expression.     

多聚腺苷二磷酸核糖聚合酶在前列腺癌LNCaP细胞株中的表达及意义

目的 探讨多聚腺苷二磷酸核糖聚合酶[Poly(ADP-ribose)polymease,PARP]对雄激素依赖性前列腺癌LNCaP细胞株增殖和凋亡的影响. 方法 将LNCaP细胞株分组培养并应用PARP抑制剂5-氨基异喹啉酮(5-AIQ)处理,蛋白印迹法检测LNCaP细胞内PARP表达的变化,四甲基偶氮唑盐法检测PARP表达抑制后对LNCaP细胞增殖的影响及其时间效应和剂量效应的关系,流式细胞仪检测5-AIQ对LNCaP细胞凋亡的影响. 结果 与空白组相比,浓度为500及1000μmol/L的5-AIQ处理48 h后LNCaP细胞内PARP的表达分别降低至65.3％和22.4％,组间比较差异有统计学意义(P＜0.05).PARP表达抑制后,LNCaP细胞增殖也受到明显抑制.随着药物浓度依次增加,细胞增殖抑制率逐渐增加,处理24 h后细胞增殖抑制率从(2.85±2.03)％升至(41.23±5.42)％,处理48 h后细胞增殖抑制率从(19.80±4.34)％升至(55.67±1.47)％,处理72 h后细胞增殖抑制率从( 25.67±0.63)％升至(65.81 ±1.62)％,组间抑制率差异均有统计学意义(P＜0.05);同样,当药物浓度维持不变时,随着作用时间延长,细胞增殖抑制率也明显升高,细胞增殖的抑制作用与5 - AIQ剂量增加和作用时间延长呈正相关关系.浓度为500及1000 μmol/L的5-AIQ处理48 h所诱导的LNCaP细胞的早期、晚期和总凋亡率分别为23.6％、4.6％、28.2％和31.8％、6.3％、38.1％,与空白组相比差异均有统计学意义(P＜0.05),且随着剂量增加,诱导细胞凋亡的作用增强.结论 抑制PARP的表达可以明显抑制LNCaP细胞增殖,并诱导LNCaP细胞的凋亡.PARP有望成为前列腺癌治疗的一个新靶点.     

白藜芦醇对人胰腺癌PANC-1细胞增殖与侵袭的影响

目的 探讨白藜芦醇对人胰腺癌PANC-1细胞增殖与侵袭能力的影响.方法 实验分为空白对照组,0.1%DMSO组,白藜芦醇组(50、100、200 μmol/L).MTT法检测白藜芦醇对细胞增殖的影响;流式细胞仪检测细胞凋亡及周期变化;Transwell侵袭小室检测白藜芦醇对细胞侵袭的影响;荧光实时定量PCR和Western blot检测白藜芦醇对细胞Bax、Bcl-2、MMP-2、MMP-9表达的影响.数据以-x±s表示,多组比较采用方差分析.结果 (1)空白对照组抑制率为0;0.1%DMSO组细胞抑制率为3.25%±0.42%;白藜芦醇50 μmol/L组细胞抑制率为13.23%±1.68%;白藜芦醇100μmol/L组细胞抑制率为42.25%±3.20%;白藜芦醇200μmol/L组细胞抑制率为56.94%±5.31%.各组比较,差异有统计学意义(F=460.10,P<0.05).(2)空白对照组细胞凋亡率为0.05%±0.03%;0.1%DMSO组细胞为凋亡率为3.39%±1.77%;白藜芦醇50 μmol/L组细胞凋亡率为6.92%±1.85%;白藜芦醇100 μmol/L组细胞凋亡率为19.05%±2.01%;白藜芦醇200 μmol/L组细胞凋亡率为27.17%±6.43%.各组比较,差异有统计学意义(F=38.84,P<0.05).(3)0.1%DMSO组对细胞周期无显著影响.白藜芦醇引起PANC-1细胞G0/G1期和S期阻滞,G2/M期细胞减少.(4)空白对照组平均穿膜细胞数为61±13;0.1%DMSO组为54±13;白藜芦醇50 μmol/L组为48±15;白藜芦醇100 μmol/L组为23±6;白藜芦醇200 μmol/L组为18±7.各组比较,差异有统计学意义(F=69.08,P<0.05).(5)白藜芦醇可使PANC-1细胞Bax表达升高,Bcl-2表达下调.MMP-2、MMP-9的表达明显受到抑制,mRNA和蛋白水平变化一致.结论 白藜芦醇可明显抑制胰腺癌PANC-1细胞增殖,诱导细胞凋亡并抑制其侵袭能力.     

La核糖核蛋白6对人血管内皮细胞增殖与凋亡的作用

目的 研究La核糖核蛋白6(Achn)在人血管内皮细胞增殖和凋亡中的调节作用.方法 (1)DMEM无血清培养基培养人血管内皮细胞株Eahy926细胞,按随机数字表法(下同)分为Achn抑制组(转染Achn抑制表达载体psi-Achn)、psi4.1空载体组(转染psi4.1)、Achn诱导组(转染Achn诱导表达载体pcDNA-Achn)、pcDNA3.1空载体组(转染pcDNA3.1)、Achn与钙/钙调蛋白依赖性丝氨酸蛋白激酶(CASK)共转染组(转染pcDNA-Achn与CASK抑制表达载体psi-CASK)、空白对照组(PBS处理),分别于转染后1、24、48、72 h用噻唑蓝法测定各组细胞570 nm波长下的吸光度值.(2)取Eahy926细胞,裂解细胞总蛋白,二辛丁酸法定量后分为蛋白质印迹组(总蛋白量为20μg)、Achn蛋白沉淀组、CASK蛋白沉淀组、IgG对照组,后3组细胞蛋白总量各为100μg,免疫共沉淀法检测各组Achn、CASK蛋白水平.(3)取Eahy926细胞分为LPS组(5 mol/L LPS处理)、氯化钾组(5 mol/L氯化钾处理)、空白对照组(5 mol/L PBS处理)、Achn诱导转染组(转染pcDNA-Achn)、Achn与CASK共转染组(转染pcDNA-Achn与psi-CASK),转染组转染24 h后加入LPS刺激12 h,免疫组织化学法检测各组半胱氨酸天冬氨酸蛋白酶3(caspase-3)蛋白表达.(4)取Eahy926细胞分为Achn诱导组(转染pcDNA-Achn)、Achn抑制组(转染psi-Achn)、对照组(PBS处理),24 h后加入烧伤患者血清处理12 h,流式细胞仪检测各组细胞凋亡率.对实验数据行t检验和单因素方差分析.结果 (1)Achn抑制组细胞增殖水平从24 h开始低于psi4.1空载体组,48、72 h时差异均有统计学意义(t值分别为10.777、6.112,P值均小于0.05);转染后24、48、72 h Achn诱导组细胞增殖水平均显著高于pcDNA3.1空载体组(t值分别为5.367、6.053、9.831,P值均小于0.05);Achn与CASK共转染组细胞增殖水平48、72 h均显著低于Achn诱导组(t值分别为5.481、9.517,P值均小于0.05).(2)CASK蛋白沉淀组CASK抗体沉淀物中可同时检测到CASK蛋白和Achn蛋白,而Achn蛋白沉淀组Achn抗体沉淀物中可同时检测到Achn蛋白和CASK蛋白.(3)Achn诱导转染组血管内皮细胞caspase-3阳性表达率为(15.6±0.5)%,低于LPS组[(32.8±2.6)%,t=10.083,P＜0.05];Achn与CASK共转染组caspase-3阳性细胞表达率[(7.0±2.0)%]进一步降低,显著低于LPS组(t=9.827,P＜0.01).(4)Achn抑制组细胞凋亡率为(45.6±10.9)%,显著高于对照组的(13.2±4.3)%,t=7.043,P＜0.05;Achn诱导组的细胞凋亡率为(5.3±2.9)%,显著低于对照组(t=6.499,P＜0.05).结论Achn能促进入血管内皮细胞增殖,抑制LPS或烧伤血清诱导细胞凋亡并与CASK的作用相关联.

Abstract：

Objective To investigate regulatory effect of Acheron (Achn) on proliferation and apoptosis of human vascular endothelial cell. Methods ( 1 ) Eahy926 cells were cultured in serum-free DMEM medium (96-well plates) and were divided into Achn inhibition group (transfected with plasmid psi-Achn), psi4.1 group (transfected with psi4. 1 empty vector), Achn induction group (transfected with pcDNA-Achn), pcDNA3.1 group (transfected with pcDNA3.1 empty vector), cotransfection group [cotransfected with pcDNA-Achn + psi-calcium/calmodulin-dependent serine protein kinase (CASK)] , blank control group (treated with PBS) according to the random number table (the same method below). The cell proliferation was determined by MTT assay at post transfection hour (PTH) 1, 24, 48, 72, with expression of absorbance value. (2) Total protein of Eahy926 cells were extracted and quantitated by BCA assay, and then they were divided into Achn antibody precipitation group (100 μg protein) , CASK antibody precipitation group ( 100 μg protein), IgG antibody group ( 100 μg protein), Western blot group (20 μg protein).Achn and CASK protein levels were determined by immunoprecipitation and Western blot. (3) Synchronously cultured Eahy926 cells were divided into LPS induction group (treated with 5 mol/L LPS), Achn transfection group (transfected with pcDNA-Achn), cotransfection group (cotransfected with psi-CASK and pcDNA-Achn) , KCl group (treated with 5 mol/L KCl), and blank control group (treated with 5 mol/LPBS). Cells in transfection groups were stimulated by LPS for 12 hours after PTH 24. Caspase-3 protein level was detected by immunohistochemistry. (4) Synchronously cultured Eahy926 cells were divided into Achn inhibition group (transfected with psi-Achn vector), Achn induction group ( transfected with pcDNA-Achn vector), and blank control group ( treated with PBS). Apoptosis rate was determined by FITC/PI with flow cytometry. Data were processed with one-way analysis of variance and t test. Results ( 1 ) The cell proliferation in Achn inhibition group was lower than that in psi4.1 group from PTH 24, and the differences were statistically significant at PTH 48, 72 (with t value respectively 10. 777, 6.112, P values all below 0. 05 ).The cell proliferation in Achn induction group during PTH 24-72 were higher that in pcDNA3. 1 group (with t value respectively 5. 367, 6. 053, 9. 831, P values all below 0.05 ). The cell proliferation in cotransfection group at PTH 48, 72 were significantly lower than that in Achn induction group ( with t value respectively 5.481, 9. 517, P values all below 0. 05). (2) Achn protein was detected in CASK antibody precipitation group while CASK protein was also detected in Achn antibody precipitation group. (3) Caspase-3 level in Achn transfection group was lower [( 15.6 ± 0. 5 ) %] as compared with that in LPS induction group [(32. 8 ±2.6)%, t = 10. 083, P ＜ 0. 05], and that in cotransfection group showed further inhibition [(7.0 ±2.0)%,t =9.827, P ＜0.01]. (4) Apoptosis rate in Achn inhibition group[(45.6 ± 10.9)%] was higher than that in blank control group [(13.2±4.3) %, t =7.043, P ＜0.05]; while that in Achn inductiongroup [(5.3 ±2.9)%] was lower than that in blank control group ( t =6.499, P ＜0.05).Conclusions Achn can promote human vascular endothelial cell proliferation, and inhibit its apoptosis induced by LPS or burn serum, and the effect is related to CASK.     

AG1478对U87细胞增殖、细胞周期和凋亡的影响

目的 观察表皮生长因子受体抑制剂Tyrphostin AG1478对人脑胶质瘤U87细胞增殖、细胞周期和细胞凋亡的影响.方法 噻唑蓝(MTT)比色法检测不同浓度Tyrphostin AG1478作用于体外培养的人脑胶质瘤U87细胞24 h后的细胞生存率,流式细胞仪检测不同浓度Tyrphostin AG1478作用于体外培养的人脑胶质瘤U87细胞24 h后细胞周期分布和细胞凋亡.结果 5、10、15、20 μmol/L的Tyrphostin AG1478作用人脑胶质瘤U87细胞24 h后细胞生存率分别为(7 8.93±11.95)%、(46.42±4.12)%、(42.13±7.54)%和(37.48±4.69)%;0、10、20 μmol/L的Tyrphostin AG1478作用人脑胶质瘤U87细胞24 h后细胞凋亡率分别为(10.19±3.15)%、(32.02±1.60)%和(54.35±2.80)%;0、10、20 μmol/L的Tyrphostin AG1478作用人脑胶质瘤U87细胞24 h后细胞主要分布在G0～G1期,分别为(51.20±1.21)%、(78.61±1.57)%和(82.73±0.77)%,实验组与对照组比较差异均有统计学意义(P＜0.05).结论 Tyrphostin AG1478抑制体外人脑胶质瘤细胞增殖,阻滞细胞周期在G0～G1期,诱导细胞凋亡,均呈浓度依赖性.

Abstract：

Objective To investigate the effects of Tyrphostin AG1478 on glioma U87 cells proliferation, cells cycle and apoptosis. Methods U87 cells were cultured for 24 h in the medium which contained AG1478 with different concentrations (0, 5, 10, 15, 20 μmol/L). The methyl thiazolyl tetrazolium(MTT) assay was used to detect the survival rate, and the cells cycle and apoptosis of the cells were examined by using flow cytometry. Results The cells proliferation was obviously inhibited by AG1478 in a dose-dependent manner. The survival rate of the cells in 5, 10, 15, 20 μmol/L AG1478 groups was (78.93 ±11.95)%, (46.42 ±4. 12)%, (42. 13 ±7.54)% and (37.48 ±4.69)% respectively, which was all significantly higher than that in 0 μ mol/L AG1478 group (P ＜0. 05 ). The apoptotic rate in 10, 25μmol/L AG1478 groups was (32.02 ± 1.60)% and (54. 35 ± 2. 80)% respectively, significantly higher than that in 0 μmol/L AG1478 group ( P ＜ 0. 05 ). The cells cycle was obviously inhibited by AG1478 in a dose-dependent manner. The percentage of cells treated with 10 and 20 μmol/L AG1478 in Go-G1 phase was ( 78. 61 ± 1.57 ) % and ( 82. 73 ± 0. 77 ) % respectively, significantly higher than that in 0 μmol/L AG1478 group (P ＜ 0. 05 ). Conclusion The growth inhibition of glioma U87 cells caused by AG1478 may be associated with apoptotsis induction and the G0-G1 arrest. AG1478 was expected to become a new anti-tumor drug in human glioma.     

塞来昔布抑制骨肉瘤细胞黏附侵袭及其机制

目的 观察环氧合酶2(COX-2)抑制剂塞来昔布对骨肉瘤MG-63和U2-OS细胞增殖、黏附和侵袭的抑制作用,探讨其分子机制.方法 采用噻唑蓝(MTF)比色法、黏附实验、侵袭实验、流式细胞术和Western blot研究25、50、100 μmol/L 3种浓度塞来昔布对两种细胞株增殖、黏附、侵袭能力及CD44和基质金属酶(MMP)-9表达的影响.结果 3种浓度的塞来昔布作用48 h后MG-63细胞增殖抑制率分别为9.35%、42.68%、60.29%(P＜0.05),对U2-OS细胞的抑制率分别为2.59%、8.95%、29.36%(P＜0.05).对MG-63的黏附抑制率分别为8.6%、21. 5%、52.8%(P＜0.05);对U2-OS的黏附抑制率分别为1.6%、3.8%、19.0%(P＜0.05);对两种骨肉瘤细胞的侵袭能力、CD44和MMP-9的表达均有抑制作用,对高表达COX-2的MG-63的抑制效应更加显著.结论 塞来昔布可抑制骨肉瘤细胞的增殖、黏附和侵袭,这种作用与下调CD44和MMP-9的表达有关,此种效应具有COX-2依耐性.     

DDR2RNA干扰对CCl4诱导肝纤维化动物模型的实验研究

目的 探讨沉默大鼠盘状结构域受体2(discoidin domain receptor 2,DDR2)基因表达对CCl4诱导大鼠肝纤维化的影响及其机制.方法 SD大鼠随机分为正常组(8)、纤维化组(18)、阴性对照组(18)和治疗组(18),每组又据干预时间不同平均分为4周、6周两组.化学合成经胆固醇修饰的siRNA-DDR2尾静脉体内注射,干扰CCl4诱导大鼠纤维化模型DDR2基因表达.用荧光实时定量PCR及Western blot分别检测干扰DDR2基因后DDR2、MMP-2和Ⅰ型胶原纤维(COLⅠ)的表达;同时行肝脏组织学观察及肝功能检测.结果 经siRNA-DDR2干扰后,纤维化组大鼠DDR2、MMP-2和COL Ⅰ的mRNA水平(t4=6.78,t6=9.02;t4=4.71,t6=6.37;t4=8.81,t6=6.50,均P＜0.01)及蛋白表达水平(t=6.11,t=4.39,t=5.23,均P＜0.01,4周;t=7.82,t=4.80,t=7.64,均P＜0.01,6周)均显著降低;同时,肝脏的组织学病变及肝功能指标也显著改变.结论 尾静脉注射化学合成经胆固醇修饰的抗DDR2siRNA能显著降低DDR2基因表达,促进细胞外基质降解,具有潜在的抗肝纤维化作用.

Abstract：

Objective To explore the effects of silencing DDR2 expression by siRNA on CCl4-induced liver fibrosis and its mechanism in rats. Methods Liver fibrosis model was induced by intraperitoneal injection of CCl4 twice a week for 6 consecutive weeks. Some rats were administered siRNA targeting DDR2 (0. 3 mg/kg), saline or control siRNA every three days from the beginning of CCl4 injection via tail vein injection, while other rats were treated in the same pattern after 2-week CCl4 injection. Quantitative real-time polymerase chain reaction (QRT-PCR) and Western blot were used to detect the mRNA and protein expressions of DDR2, MMP-2 and COL Ⅰ . Meanwhile, the pathological changes of liver tissues and the levels of liver function were also observed. Results QRT-PCR showed that the DDR2, MMP-2 and COL Ⅰ mRNA in the chemically synthetic cholesterol-modified siRNADDR2 group were significantly decreased as compared with those in the control group (P＜0.01) ,and the protein expressions of DDR2, MMP-2 and COL Ⅰ were also significantly decreased (P＜0. 01,4 wand 6w). In addition, in comparison with those in the control group, the pathological changes of liver tissues in the siRNA-DDR2 treated group were markedly attenuated, and the levels of ALT(1356.17 ±83.80 nkat/L vs 2532. 70±145.11 nkat/L,4w,1367. 60±321.76 nkat/L vs 2604.37±255.02 nkat/L,6w,P＜0. 01 ) and AST (2460. 80 ± 207. 58 nkat/L vs 3983. 70 ± 253. 08 nkat/L, 4w, P＜ 0. 01,2383.27±290.16 nkat/L vs 3227.70±353. 34 nkat/L,6w,P＜0. 05)were also significantly lowered,while the level of TBIL (7. 97 ± 1.60 μmol/L vs 3.80± 0.60 μmol/L, 4w, 10.40±1.61 μmol/L vs 6.10±0.79 μmol/L,6w,P＜0. 01)was markedly increased. Conclusion Systemic administration of cholesterol-modified siRNA targeting DDR2 could significantly suppress the expression of DDR2, decrease the contents of the extracellular matrix,and thus has a potential antifibrotic effect.     

L-精氨酸和氨基胍在大鼠肺移植缺血再灌注损伤中的作用

目的 观察L-精氨酸(L-Arg)和氨基胍对大鼠肺移植后缺血再灌注的保护作用.方法 建立大鼠左单肺移植模型,术后随机分为A组(对照组,腹腔注射生理盐水),B组(腹腔注射L-Arg)、C组(腹腔注射氨基胍)和D组(腹腔注射L-Arg和氨基胍),每组6只.移植肺再灌注2 h后,检测肺组织髓过氧化物酶(MPO)、丙二醛(MDA)含量、超氧化物歧化酶(SOD)活力、内皮型一氧化氮合酶(eNOS)和诱导型一氧化氮合酶(iNOS)活性并测定移植肺干湿重比(W/D)及静脉血中一氧化氮(NO)含量,观察移植肺的病理学形态.结果 再灌注2 h后,B组移植肺的W/D(5.10±0.21)、MPO(1.74±0.26)U/g和MDA(20.87±2.90)μmol/g均低于A组W/D(5.74 ±0.14)、MPO(2.36±0.32)U/g和MDA(31.33 ±3.46)μmol/g;SOD活性(424.29±27.86)U/mgprot、NO含量(175.12 ±17.40)μmol/L、iNOS活性(3.62 ±0.26)U/mgprot和eNOS活性(5.36±0.28)U/mgprot均较A组SOD活性(268.01±26.06)U/mgpro、NO含量(98.29±6.95)μmol/L、iNOS活性(2.53 ±0.22)U/mgprot和eNOS活性(3.57 ±0.40)U/mgprot高(P＜0.05).C组的NO含量(84.13±5.18)μmol/L、iNOS活性(1.81 ±0.09)U/mgprot均较A组低(P＜0.05).D组的W/D(4.79 ±0.19)、MPO(1.24±0.13)U/g、MDA(14.60±4.14)μmol/g、iNOS活性(1.99±0.17)U/mgprot低于A组,SOD活性(493.75±24.95)、NO含量(149.61±10.70)μmol/L、eNOS活性(5.50±0.27)U/mgprot高于A组(P＜0.05).与B组比较,D组的W/D、MPO、MDA、NO含量、iNOS活性降低,SOD升高(P＜0.05).病理形态学检查显示D组炎细胞浸润及渗出最轻,B组次之,A组和C组最差.结论 移植后再灌注早期应用L-Arg可减轻缺血再灌注损伤,应用氨基胍并不能减轻移植肺的损伤,但联合应用L-Arg和氨基胍优于单纯应用L-Arg.

Abstract：

Objective To investigate the effects of L-arginine (L-Arg) and aminoguanidine on ischemia-reperfusion injury following rat lung transplantation. Methods The models of rats lung transplantation were established and 4 groups ( n = 6 each) were randomly set up: group A ( normal control group)and treated groups B, C and D. In these groups, different medicines (NS, group A; L-Arg, group B;aminoguanidine, group C; L-Arg and aminoguanidine, group D) were intraperitoneally administered to the recipient rats before reperfusion. After reperfusion for 2 h, the lung graft was harvested for measurements of lung wet/dry ratio ( W/D ) , myeloperoxidase ( MPO ) , malondialdehyde ( MDA ) , superoxide dismutase (SOD) , endothelial nitric oxide synthase (eNOS) , inducible nitric oxide synthase (iNOS). The contents of plasma nitric oxide (NO) were determined. The pathological changes in the lung grafts were observed.Results After reperfusion for 2 h, W/D (5. 10 ±0.21), MPO (1.74 ±0.26) U/g, MDA (20.87 ±2. 90) μmol/g in group B were significantly lower [W/D (5. 74 ± 0. 14), MPO (2. 36 ± 0. 32) U/g,MDA (31. 33 ±3.46) μmol/g] (P ＜ 0. 05), and the levels of SOD (424. 29 ± 27. 86) U/mg protein,NO (175. 12 ± 17. 40) μmol/L, iNOS (3. 62 ±0. 26) U/mg protein and eNOS (5. 36 ±0. 28) U/mg protein were significantly higher than in group A [SOD (268.01 ±26.06) U/mg protein, NO (98.29 ±6.95) μmol/L, iNOS (2.53 ±0.22) U/mg protein and eNOS (3. 57 ±0.40) U/mg protein] (P＜0. 05). The contents of NO (84. 13 ±5. 18) μmol/L and iNOS (1. 81 ±0. 09) U/mg protein in group C were significantly lower than in group A (P ＜ 0. 05). W/D (4. 79 ± 0. 19) , MPO (1. 24 ± 0. 13 ) U/g,MDA (14. 60 ±4. 14) μmol/g, iNOS (1. 99 ±0. 17) U/mg protein were significantly lower than in group A (P ＜0. 05) , and SOD (493. 75 ±24. 95) , NO (149. 61 ± 10. 70) μmol/L and eNOS (5. 50 ±0. 27)U/mg protein in group D were significantly higher than in group A (P＜0. 05). W/D, MPO, MDA, NO and iNOS in group D were significantly reduced as compared with group B (P ＜ 0. 05 ) , and SOD was significantly increased in group B ( P ＜ 0. 05 ) . The pathological examination revealed that the inflammatory cell infiltration in group D was the mildest, followed by groups B, A and C. Conclusion The L-Arg could alleviate the lung ischemia-reperfusion injury after transplantation, the combined used of L-Arg and aminoguanidine could obtain better effects than L-Arg used alone. The aminoguanidine used alone could not alleviate ischemia-reperfusion injury after transplantation.     

毛蕊异黄酮对PI3K/Akt信号通路与PC-3细胞凋亡的作用

目的 探究毛蕊异黄酮促进前列腺癌细胞PC-3凋亡的机制.方法 选取0、25、50、100、200μmol/L的毛蕊异黄酮(Calycosin)处理PC-3细胞,并设置溶剂对照(DMSO,二甲基亚砜)组,采用MTT法检测48h后细胞增殖情况;流式细胞术检测0、25、50、100、200 μmol/L48h后细胞凋亡率;Western Blot法检测0μmoL/L组、200μmol/L毛蕊异黄酮组、200μmol/L毛蕊异黄酮+ PI3K特异性抑制剂(Wortmannin)共处理组细胞的Akt、磷酸化的Akt(p-Akt)、Bax、Bcl-2和Caspase-3蛋白的表达水平.结果 MTT实验显示毛蕊异黄酮能够抑制PC-3细胞的增殖,且呈现剂量依赖性(P＜0.05);流式细胞实验显示,0、25、50、100、200μmol/L浓度水平的毛蕊异黄酮处理PC-3细胞48h后的凋亡率分别为(0.1±0.04)％、(6.8±0.6)％、(9.2±0.2)％、(11.5±0.27)％、(59.2±0.36)％(P ＜0.05);Western blot法显示,与0μmol/L组相比,200μmol/L毛蕊异黄酮组p-Akt、Bcl-2表达水平下降(P＜0.05),加入Wortmannin后,二者水平再次下降;与0μmol/L组相比,200μmol/L毛蕊异黄酮组Bax、Caspsse-3表达水平增加(P＜0.05),加入Wortmannin后,二者水平再次增加.结论 毛蕊异黄酮可抑制PC-3细胞的增殖并诱导其凋亡,其机制是下调PI3K/Akt信号通路,启动线粒体诱导的凋亡途径.