人β_3-AR和PPAR-γ2基因真核表达载体及β_3-AR稳定表达细胞株的构建

目的构建高效表达人β3-肾上腺素受体(hβ3-AR)的真核细胞表达载体,为进一步研究hβ3-AR的功能以及与过氧化物酶体增殖体激活受体-γ2(PPAR-γ2)调控基因之间的相互影响奠定基础。方法从人肾旁脂肪组织提取总RNA,应用逆转录-聚合酶链式反应(RT-PCR)方法扩增hPPAR-γ2、hβ3-AR cDNA全长序列。将EcoRⅠ和XhoⅠ双酶切后的hβ3-AR cDNA与同样进行EcoRⅠ和XhoⅠ双酶切的pcDNA3·1(+)载体连接形成重组载体pcDNA3·1(+)/hβ3-AR。将XbaⅠ和AflⅡ双酶切后的hPPAR-γ2cDNA与同样进行XbaⅠ和AflⅡ双酶切的pcDNA3·1(+)载体连接形成重组载体pcDNA3·1(+)/hPPAR-γ2。通过限制性内切酶酶切鉴定后对DNA序列进行测序,鉴定重组质粒中hβ3-AR和hPPAR-γ2基因的完整性和可靠性。运用定点诱变方法,对野生型hPPAR-γ2和hβ3-AR质粒进行定点诱变,构建Pro12Ala突变的hPPAR-γ2和Trp64Arg突变的hβ3-AR的pcDNA3·1(+)载体,电穿孔法将人hβ3-AR重组表达载体pcDNA3·1(+)/hβ3-AR(突变型和野生型)转染到SH-SY5Y细胞中,用G418筛选获取稳定转染细胞株,并用RT-PCR、Western blot方法进行鉴定。结果酶切和测序分析显示重组质粒构建正确,并在转染的SH-SY5Y细胞中获得hβ3-AR的高效表达。结论成功克隆了人PPAR-γ2、β3-AR基因全长cDNA,并成功构建了人野生型和突变型的hPPAR-γ2和hβ3-AR的真核表达重组体〔pcDNA3·1(+)/hPPAR-γ2和pcDNA3·1(+)/hβ3-AR〕。成功获得了稳定表达hβ3-AR基因的SH-SY5Y细胞株。     

人白细胞介素24真核表达载体的构建及其在HepG2细胞中的表达

目的 构建人白细胞介素24(human interleukin-24,hIL-24)真核表达载体,并在HepG2细胞中稳定表达,为进一步研究其抗肿瘤作用奠定基础.方法 采用逆转录聚合酶链反应(RT-PCR),从植物血凝素活化的人外周血单个核细胞中克隆得到hIL-24基因目的 片段.应用DNA重组技术将IL-24PCR产物双酶切后定向克隆至真核表达载体pcDNA3.1(+),转化大肠杆菌DHSα获得重组载体,进行PCR、酶切及测序鉴定.应用脂质体将鉴定正确的重组质粒转染至HepG2细胞,用G418筛选稳定转染细胞株.采用RT-PCR检测稳定转染细胞HepG2中IL-24 mRNA的表达.结果 通过RT-PCR获得与预期大小一致约600 bp的IL-24基因片段;重组载体pcDNA3.1(+)-IL-24经PCR、双酶切及测序证实,IL-24 eDNA片段已正确插入真核表达载体中;在稳定转染的HepG2细胞株中可见到IL-24 mRNA表达.结论 成功构建了hIL-24真核表达载体pcDNA3.1(+)-IL-24,并获得了稳定转染该重组质粒的HepG2细胞株.     

人IL-24基因在CHO细胞中的表达及其抗肿瘤效应

目的构建人IL-24基因真核表达载体,在CHO细胞中进行稳定表达,并检测重组表达蛋白rhIL-24的抗肿瘤活性。方法将测序验证的人IL-24基因亚克隆至真核表达载体pcDNA3,构建重组真核表达载体pcDNA3-hIL-24,转染CHO细胞进行稳定表达,经RT-PCR鉴定后用MTT法、Ho-echst染色和流式细胞术检测CHO细胞表达的rhIL-24诱导A549人肺腺癌细胞凋亡的抗肿瘤效应,用ELISA检测其刺激免疫细胞分泌IL-6和IFN-γ的功能。结果经双酶切和PCR鉴定,重组真核表达载体构建正确,人IL-24在CHO细胞中获得稳定表达,且所表达的人IL-24具有较强的诱导A549人肺腺癌细胞凋亡及上调免疫细胞表达IL-6和IFN-γ的免疫刺激活性。结论人IL-24基因的稳定表达和抗肿瘤效应的实验研究,为进一步研究人IL-24抗肿瘤的分子机制及潜在的应用奠定了基础。     

真核表达载体介导白细胞介素24在HepG2细胞的表达及其体外抗肿瘤效应研究

目的  研究真核表达载体pcDNA3.1(+) 介导白细胞介素（interleukin, IL）24在肝癌细胞系HepG2细胞中表达的可行性,以及IL-24体外对HepG2细胞的抗瘤效应和可能机制。方法 采用脂质体转染法将重组质粒pcDNA3.1(+)-IL-24 及空质粒分组转染HepG2细胞,在倒置显微镜下观察细胞形态变化。用噻唑蓝比色方法测量细胞增殖指数,流式细胞仪研究细胞早期凋亡率及其细胞周期分布。结果  IL-24 mRNA成功表达于HepG2细胞中。重组质粒转染组可见明显的凋亡细胞形态,48 h增殖抑制率（F=27.058,P<0.01）、72 h增殖抑制率( F=63.481,P<0.01)和早期细胞凋亡率( F=326.220,P<0.01)与对照组的差异均有统计学意义。细胞分布呈明显的G2/M周期阻滞。结论 真核表达载体pcDNA3.1(+)可以有效地介导IL-24在HepG2细胞的表达。IL-24对HepG2细胞有明显的增殖阻滞和凋亡诱导效应,G2/M细胞周期阻滞或许是IL-24抗瘤效应的机制。       

pcDNA3.1/hTSHR_(1043～1354 bp)重组体的构建及在中国仓鼠卵巢细胞中的表达

目的构建重组体pcDNA3.1/hTSHR1043～1354bp及在中国仓鼠卵巢细胞(CHO)表达hTSHR膜外区氨基酸314～418蛋白分子。方法提取人正常甲状腺组织总RNA,反转录后进行聚合酶链反应(PCR),将纯化的扩增产物hTSHR1043～1354bp与表达载体pcDNA3.1连接后转化TOP10E.coli感受态菌。经PCR、HindⅢ酶切和核苷酸序列测定方法鉴定插入序列和方向正确的重组质粒转染CHO细胞,并用Westernblot方法鉴定表达的蛋白。结果PCR扩增得到hTSHR膜外区C端312bp的基因片段hTSHR1043～1354bp。该片段与表达载体pcDNA3.1的连接后转化TOP10E.coli感受态菌。重组质粒经PCR、HindⅢ酶切和核苷酸序列测定方法鉴定证实hTSHR1043～1354bp片段插入序列和方向正确。重组质粒转染的CHO细胞裂解液经Westernblot可以检测出15900的蛋白条带,与预期的蛋白相对分子质量相符。结论成功构建了重组体pcDNA3.1/hTSHR1043～1354bp,其转染CHO细胞后表达159000的目的蛋白(hTSHR氨基酸314～418蛋白片段)。     

微囊化小鼠白介素12基因工程细胞的长效抗肿瘤作用

目的　探讨通过微囊化能否获取长效抗肿瘤的小鼠白介素 12 (mIL 12 )基因工程细胞。方法　构建pcDNA3.1/mIL 12重组表达质粒 ,然后稳定转染CHO细胞 ,采用海藻酸钠微囊制作技术 ,将mIL 12基因修饰的CHO细胞包裹。观察微囊化mIL 12基因工程细胞的mIL 12释放 ,并将微囊化细胞植入荷瘤小鼠体内 ,测定小鼠的抗肿瘤免疫功能及抑瘤效应。结果　微囊化mIL 12基因工程细胞产生的mIL 12蛋白可自由透过微囊膜。植入荷瘤小鼠体内2 1d后 ,微囊化mIL 12基因工程细胞治疗组血清中mIL 12 ,mIL 2及mIFN γ水平分别为 (5 49± 5 3) ,(180± 2 9)和 (10 0 8± 15 6 )ng·L- 1,而mIL 4 ,mIL 10水平则显著降低。脾脏细胞毒T淋巴细胞 (CTL)活性及自然杀伤细胞 (NK)活性均显著增高 ,肿瘤生长受到显著性抑制 ,荷瘤小鼠的存活期明显延长。结论微囊化mIL 12基因工程细胞在体内可持续、稳定地释放mIL 12 ,能激发机体产生持久而强大的抗肿瘤免疫反应 ,对实验小鼠产生明显的抗肿瘤效应并延长其生存期。     

Antiviral activity of type I interferons and interleukins 29 and 28a (type III interferons) against Apeu virus

Interferons (IFNs) are cytokines with important immunomodulatory activity in vertebrates. Although type I IFNs and interleukins (IL) 29 and 28a (type III IFNs) bind to different cellular receptors and have distinct structures, most of their biological activities are redundant. Apeu virus (APEUV) is a member of the Bunyaviridae family isolated from the Brazilian rain forest. In this paper we evaluated the antiviral activity of type I and type III IFNs against APEUV. All tested IFNs were able to induce an antiviral state against the virus in a dose-dependent way. The activity of type III IFNs did not need the presence of type I IFNs. Mixing both types of IFNs did not improve the biological activity of each type alone. The tested IFNs were also able to protect human peripheral blood mononuclear cells from infection. IFN alpha2, IFN beta, IL-29 and IL-28a induced the expression of 2′,5′-oligoadenylate synthetase (2′5′OAS) and 6–16 genes. Although MxA gene was related to antiviral activity against Bunyaviruses, there was no induction of MxA in our model. We were able to show activity of type I and type III IFNs against a RNA virus, and that this activity is not dependent on MxA gene.     

凝血栓蛋白-1Ⅰ型重复序列反义核酸在血管内皮细胞中的作用研究

目的探讨TSP-1Ⅰ型重复序列反义RNA对人脐静脉血管内皮细胞(human umbilical vein endothelial cells,HU-VECs)生长活性、增殖活性影响。方法构建TSP-1Ⅰ型重复序列反义RNA真核表达载体(pcDNA3.1-/anti-TSP-1-Ⅰ),经双酶切、测序及Western blot鉴定后,转染HUVECs。采用MTT法检测转染后HUVECs活性改变,流式细胞仪检测转染后HUVECs周期变化,透射电镜观察转染后HUVECs形态学改变。结果构建的pcDNA3.1-/anti-TSP-1-Ⅰ经鉴定后转染HUVECs,MTT法检测所得HUVECs OD值较未转染组、pcDNA3.1-空载体转染组升高(均P<0.01);流式细胞仪检测结果显示:pcDNA3.1-/anti-TSP-1-Ⅰ转染HUVECs后S+G2(%)较未转染组、pcDNA3.1-空载体转染组S+G2(%)延长(均P<0.01);透射电镜结果显示:pcDNA3.1-/anti-TSP-1-Ⅰ转染后HUVECs核仁相对增多。结论TSP-1反义RNA能够促进HUVECs增殖和生长。     

Antiviral activity of type I interferons and interleukins 29 and 28a (type III interferons) against Apeu virus

Interferons (IFNs) are cytokines with important immunomodulatory activity in vertebrates. Although type I IFNs and interleukins (IL) 29 and 28a (type III IFNs) bind to different cellular receptors and have distinct structures, most of their biological activities are redundant. Apeu virus (APEUV) is a member of the Bunyaviridae family isolated from the Brazilian rain forest. In this paper we evaluated the antiviral activity of type I and type III IFNs against APEUV. All tested IFNs were able to induce an antiviral state against the virus in a dose-dependent way. The activity of type III IFNs did not need the presence of type I IFNs. Mixing both types of IFNs did not improve the biological activity of each type alone. The tested IFNs were also able to protect human peripheral blood mononuclear cells from infection. IFN alpha2, IFN beta, IL-29 and IL-28a induced the expression of 2′,5′-oligoadenylate synthetase (2′5′OAS) and 6–16 genes. Although MxA gene was related to antiviral activity against Bunyaviruses, there was no induction of MxA in our model. We were able to show activity of type I and type III IFNs against a RNA virus, and that this activity is not dependent on MxA gene.     

β-arrestin2基因转染对人肺腺癌细胞 A549的增殖影响

目的：观察外源性β-arrestin2基因对人肺腺癌细胞A549增殖的影响。方法利用脂质体转染技术将真核表达重组体pcDNA3 c．1-β-arrestin2质粒和空载体pcDNA3．1质粒分别导入A549细胞,经G418筛选后获得稳定转染细胞克隆,RT-PCR和Western blotting检测β-arrestin2基因表达的影响。采用MTT（四甲基偶氮唑盐）法分析转染细胞的增殖情况。结果经脂质体转染和筛选,建立了稳定表达β-arrestin2基因的A549细胞系。与未转染组和转染空白载体组比较,转染β-arrestin2基因的细胞生长速度明显减慢（ P ＜0．05）。结论β-arrestin2基因可能通过抑制P65活性而抑制人肺腺癌细胞A549的生长。     

防御素5和LL37真核重组质粒构建及转染人阴道上皮细胞的研究

目的:构建防御素5(HD5)和LL37的真核重组质粒并瞬时转染人阴道上皮细胞,以期探讨阴道上皮细胞抵抗微生物感染的机制.方法:(1)从人阴道上皮细胞中提取总RNA,经逆转录-聚合酶链反应(RT-PCR)扩增出HD5和LL37的cDNA,并将其插入真核表达载体pcDNA3.1 (+)-EGFP中、构建重组质粒pcDNA3.1 (+)/HD5-EGFP和pcDNA3.1(+ )/LL37-EGFP.(2)经组织块法原代培养入阴道上皮细胞并传代,将2种质粒分别或联合转染人阴道上皮细胞,转染6、12、24和48 h后,采用荧光显微镜检测细胞转染情况,ELISA方法测定细胞培养上清液中HD5及LL37的表达情况.结果:成功构建了pcDNA3.1( +)/HD5-EGFP和pc DN A3.1(+ )/LL37-EGFP真核表达载体,实现了HD5和LL37在阴道上皮细胞中表达,细胞培养上清中有HD5和LL37蛋白分子表达,且在转染24h时表达量最高.联合转染组的HD5和LL37水平高于单独转染组,单独转染组高于未转染组,差异均有统计学意义(均P＜0.001).LL37组和联合转染组的LL37水平,联合转染组的HD5水平均是6h时分泌最低,24h达高峰,然后呈下降趋势.HD5组的HD5水平随时间增加而呈增加趋势.结论:HD5和LL37成功转染人人阴道上皮细胞并成功表达,为研究重组HD5和LL37的抗菌功能及阴道上皮细胞先天免疫机制奠定了基础.     

白介素29体外抗乙肝病毒作用

目的研究白介素29(IL-29)体外抗乙肝病毒的效果。方法从RNA水平探讨了IL-29抗乙肝病毒的效果。RT-PCR分析IL-29诱导抗病毒蛋白MxA、2′,5-′OAS、PKR和RNase L mRNA水平表达;同时Western blot分析IL-29激活的信号通路以探讨其抗乙肝病毒的机理。结果IL-29能明显降低HepG2.2.15细胞中乙肝病毒mRNA的水平,且能够上调抗病毒蛋白MxA和2′,5-′OAS的mRNA表达并激活ERK1/2、AKT信号途径。结论在HepG2.2.15细胞中IL-29有显著的抗乙肝病毒作用。     

ROCK通路在DLC-工基因调控人结肠癌HT29细胞侵袭中的作用

目的 观察肝癌缺失基因1(DLC-1)对HT-29细胞侵袭能力的影响.方法 用脂质体法将重组质粒pcDNA3.1-DLC-1转染HT-29细胞;应用Rho激酶(ROCK)特异性抑制剂Y27632处理HT-29细胞;Western blot检测p-MLC蛋白表达;Transwell小室实验检测细胞侵袭能力.结果 野生型HT-29细胞DLC-1基因表达呈阴性,经转染获得DLC-1稳定表达细胞系;与对照组及空载组HT-29细胞相比,转染组和ROCK抑制剂组p-MLC蛋白表达均下调,细胞侵袭能力受到抑制(P<0.05).结论 转染DLC-1基因可能通过抑制ROCK活性,从而抑制HT-29细胞的侵袭能力.     

ADAM28基因对人牙囊细胞生物学特性的影响

目的探讨ADAM28基因对人牙囊细胞(HDFC)增殖、分化等生物学特性的影响及可能的作用机制。方法应用基因重组技术、细胞培养、基因转染、四唑盐比色法(MTT)、流式细胞术(FCM)和酶动力学方法探讨ADAM28基因对HDFC生物学特性的影响。结果成功构建并转染ADAM28真核质粒,系列检测显示:真核质粒转染组HDFC的增殖活性、增殖指数、ALP分泌活性明显高于空载体组及未转染组(P<0.01)。结论ADAM28可显著促进HDFC的增殖和ALP的分泌,并可能同时激活Notch信号途径,参与调控HDFC的增殖、分化和矿化。     

Antineoplastic and Antiviral Activities of Podophyllotoxin Related Lignans

28 cyclolignans, most of them derived from podophyllotoxin, have been evaluated for their antineoplastic and antiviral activities. They were subjected to screening against P-388 murine leukemia, A-549 human lung carcinoma, and HT-29 colon carcinoma, while antiviral assays were performed on herpes simplex virus type I infecting fibroblasts of monkey kidney (HSV/CV-1) and on vesicular stomatitis virus infecting fibroblasts of hamster kidney (VSV/BHK). A number of substances were active in both groups of assays at concentrations below 1μM; deoxypodophyllotoxin ( 1 ) being the most potent compound in all cases.     

LINC00094靶向miR-19b对非小细胞肺癌增殖、侵袭的抑制作用及其分子机制

目的 探讨LINC00094对非小细胞肺癌A549细胞增殖、凋亡、迁移、侵袭的影响及其作用机制。方法 将pcDNA3.1、pcDNA3.1-LINC00094、si-NC、si-LINC00094转染至非小细胞肺癌A549细胞中;将pcDNA3.1-LINC00094分别与miR-NC、miR-19b转染至A549细胞中,分别记为pcDNA3.1-LINC00094+miR-NC组、pcDNA3.1-LINC00094+miR-19b组。采用实时荧光定量PCR检测LINC00094和miR-19b表达水平;采用蛋白质印迹法检测细胞周期蛋白和凋亡蛋白表达水平;采用四甲基偶氮唑盐比色法、流式细胞术和Transwell分别检测细胞增殖、凋亡、迁移和侵袭能力;双荧光素酶报告实验检测LINC00094与miR-19b的靶向关系。结果 LINC00094在肺癌组织中低表达。过表达LINC00094可降低A549细胞的生存率,并抑制细胞迁移、侵袭（P<0.05）,且伴有相关蛋白表达水平的改变（P<0.05）。LINC00094靶向调控miR-19b,过表达miR-19b可逆转LINC00094对A549细胞增殖、迁移、侵袭的抑制作用和对细胞凋亡的促进作用。结论 LINC00094可靶向抑制miR-19b的表达,从而抑制A549细胞的增殖、迁移和侵袭。     

Trichostatin A sensitizes cisplatin-resistant A549 cells to apoptosis by up-regulating death-associated protein kinase

Aim:

To investigate the apoptosis-inducing effect of trichostatin A (TSA) in the human lung adenocarcinoma cisplatin-resistant cell line (A549/CDDP) and to examine whether TSA can enhance sensitivity to cisplatin treatment and the underlying molecular mechanisms of such an enhancement.

Methods:

Cell viability was evaluated using the Neutral Red assay. Apoptosis was assessed using Hoechst 33258 staining and flow cytometry analysis. Protein expression was detected by Western blotting. To determine the role of Death-associated protein kinase (DAPK) in TSA-induced apoptosis in the A549/CDDP cell line, cells were transfected with pcDNA3.1(+)-DAPK, which has a higher expression level of DAPK compared to endogenous expression, and DAPK activity was inhibited by both over-expression C-terminal fragment of DAPK which may competitive binding DAPK substrates to inhibit the function of DAPK and RNA interference.

Results:

TSA induced apoptosis in both A549 cells and A549/CDDP cells. TSA enhanced the sensitivity of A549/CDDP cells to cisplatin, along with concomitant DAPK up-regulation. When DAPK was over-expressed, A549/CDDP cells became sensitive to cisplatin and the cytotoxicity of TSA could be increased. Moreover, the cytotoxicity of TSA could be alleviated by inhibition of DAPK activity by the expression of a recombinant C-terminal fragment of DAPK or RNA interference.

Conclusion:

TSA induced sensitivity to cisplatin treatment in cisplatin-resistant A549 cells. The up-regulation of DAPK is one of the mechanisms mediating sensitization to TSA-induced apoptosis in cisplatin-resistant cells.     

真核表达质粒pcDNA3.1(+)-h/mCD44v6的构建和鉴定

目的构建含人/鼠嵌合粘附分子CD44拼接变异体6(chimeric human and mouse CD44 splice variant 6,h/mCD44v6)基因真核表达质粒pcDNA3.1(+)-h/mCD44v6,并进行表达。方法通过PCR扩增h/mCD44v6的全基因cDNA,将扩增的cDNA克隆至PGM-Teasy,测序后插入pcD-NA3.1(+)真核表达质粒,构建重组真核表达质粒pcD-NA3.1(+)-h/mCD44v6,经限制内切酶酶切分析及测序鉴定后,用脂质体转染B16细胞,通过RT-PCR扩增出B16/pcDNA3.1(+)-h/mCD44v6细胞株中h/mCD44v6全段基因cDNA。结果经4轮PCR,成功扩增出h/mCD44v6的cD-NA全长基因,成功构建了真核表达质粒pcDNA3.1(+)-h/mCD44v6,通过RT-PCR方法证实该质粒能在B16真核细胞中正确表达;建立了稳定的细胞株B16/pcDNA3.1(+)-h/mCD44v6。结论成功克隆和构建了h/mCD44v6的真核表达质粒pcDNA3.1(+)-h/mCD44v6,为进一步研究h/mCD44v6的新功能和免疫治疗奠定了基础。     

Cytotoxicities and Quantitative Structure Activity Relationships of B13 Sulfonamides in HT-29 and A549 Cells

B13 analogues are being considered as therapeutic agents for cancer cells, since B13 is a ceramide analogue and inhibits ceramidase to promote apoptosis in cancer cells. B13 sulfonamides are assumed to have biological activity similar to B13, since they are made by bioisosterically substituting the carboxyl moiety of B13 with sulfone group. Twenty B13 sulfonamides were evaluated for their in vitro cytotoxicities against human colon cancer HT-29 and lung cancer A549 cell lines using MTT assays. Replacement of the amide group with a sulfonamide group increased cytotoxicity in both cancer cell lines. The sulfonamides with long alkyl chains exhibited activities two to three times more potent than that of B13 and compound (15) had the most potent activity with IC(50) values of 27 and 28.7μM for HT-29 and A549, respectively. The comparative molecular field analysis (CoMFA) and comparative molecular similarity indices analysis (CoMSIA) were used to carry out QSAR molecular modeling of these compounds. The predictive CoMSIA models for HT-29 and A549 gave cross-validated q2 values of 0.703 and 0.830, respectively. From graphical analysis of these models, we suppose that the stereochemistry of 1,3-propandiol is not important for activity and that introduction of a sulfonamide group and long alkyl chains into B13 can increase cytotoxicity.