衰老相关蛋白prelamin A与MT-2A的相互作用

目的分析衰老相关蛋白prelamin A是否与MT-2A相互作用,以及MT-2A与衰老的关系。方法采用酵母双杂交方法从人骨骼肌文库中筛选prelamin A的相互作用蛋白,酵母一对一回复性杂交和荧光共定位验证MT-2A与prelamin A是否相互作用。RT-PCR分析MT-2A在正常和早老细胞中的表达。结果通过酵母双杂交方法从人骨骼肌文库中筛选到prelamin A的候选相互作用蛋白MT-2A,一对一回复性验证也证明两者能在酵母细胞中相互作用。构建含绿色荧光蛋白的MT-2A融合表达载体转染HEK-293细胞,激光共聚焦显微观察发现MT-2A能与带红色荧光蛋白的prelamin A蛋白在核膜共定位。研究还发现MT-2A的表达在早老细胞中显著下调(P<0.01)。结论 MT-2A作为一个新的prelamin A结合蛋白,可能在细胞早老过程中具有重要的作用。     

吉非替尼诱导p27核转位并激活半胱天冬酶8促进NSCLC细胞凋亡的机制

目的探讨吉非替尼诱导的p27蛋白表达改变和核转位及半胱天冬酶(Caspase)8的激活对表皮生长因子受体(EGFR)突变的非小细胞肺癌(NSCLC)细胞周期阻滞和细胞凋亡的影响及作用机制。方法选取存在19号外显子缺失突变的对吉非替尼敏感的NSCLC细胞系HCC827,采用3-(4,5-二甲基噻唑-2)-2,5-二苯基四氮唑溴盐(MTT)法和流式细胞术分别检测吉非替尼在不同浓度和时间下对细胞活性的影响。利用Western印迹检测p27蛋白和Caspase及其他相关蛋白的相对含量。通过免疫荧光法观察p27蛋白的亚细胞定位。采用蛋白免疫共沉淀验证p27蛋白和Caspase8之间的相互作用。结果吉非替尼浓度-时间依赖性促进了HCC827细胞凋亡。当吉非替尼干预18 h后,细胞周期蛋白依赖性激酶(CDK)抑制因子p27蛋白表达开始出现显著升高(P<0.05),且p27蛋白在此过程中伴随从细胞核到细胞质的核转位现象,而促凋亡蛋白B细胞淋巴瘤(Bcl)-2相关x蛋白(Bax)和Bad及抗凋亡蛋白Bcl-2和Bcl/白血病-x基因长片段(Bcl-xl)在吉非替尼干预后表达并未发生显著改变。此外,细胞质中p27蛋白与Caspase8的降解中间体p43/p41结合从而抑制其自身细胞质向细胞核易位。结论推断吉非替尼通过调节p27蛋白的亚细胞定位及Caspase8之间的相互作用,从而达到促EGFR突变的NSCLC细胞凋亡的效果。     

转录因子Slug与KLF5相互作用及其对肝癌细胞迁移能力的影响

目的探讨转录因子Slug与KLF5之间的相互作用及Slug是否作为KLF5的下游信号因子影响肝癌细胞的迁移能力。方法通过免疫沉淀实验和免疫荧光实验检测Slug与KLF5之间相互作用及共定位,并在肝癌细胞中转入Slug过表达质粒,以及使用shRNA抑制其表达,观察肝癌细胞迁移能力的改变。结果在肝癌细胞中发现转录因子Slug的表达随KLF5的改变而改变,并且KLF5与Slug之间在蛋白水平存在相互作用及共定位。然而,在肝癌细胞中过表达或抑制Slug的表达并没有影响肝癌细胞的迁移能力。结论 KLF5与另一转录因子Slug存在相互作用及细胞中共定位,但是转录因子Slug并不是作为KLF5的下游信号因子影响肝癌细胞的迁移能力。     

αB-晶状体蛋白与凋亡相关蛋白相互作用抑制C2C12细胞凋亡

目的探讨αB-晶状体蛋白抗心肌细胞凋亡的分子机制.方法构建带6个串联组氨酸的αB-晶状体蛋白表达质粒(pcDNA3.1-aBC),经测序证实后,转染C2C12肌原细胞株,筛选稳定高表达αB-晶状体蛋白的细胞株.采用H2O2(0.5 mmol/L)诱导细胞凋亡,检测线粒体细胞色素C释放率和细胞膜磷脂酰丝氨酸细胞色素荧光强度作为细胞凋亡早期判断指标.提取细胞线粒体蛋白及胞浆蛋白,采用镍金属亲和层析分离αB-晶状体蛋白与其相互作用蛋白复合物,免疫共沉淀证实其蛋白质相互作用.结果①H2O2处理1 h后,转染αB-晶状体蛋白的细胞线粒体释放细胞色素C和细胞膜磷脂酰丝氨酸外翻均较对照组明显减少.②经Western blot检测,发现αB-晶状体蛋白与其相互作用蛋白复合物中存在线粒体凋亡相关蛋白p53、核因子κB、细胞色素C和Smac.③经免疫共沉淀证实,H2O2诱导细胞凋亡时,αB-晶状体蛋白与p53、细胞色素C和Smac等促凋亡蛋白相互结合增多,而与抗凋亡蛋白核因子κB相互结合减少.结论αB-晶状体蛋白基因转染可早期抑制氧化应激所致的C2C12肌原细胞凋亡,其机制可能涉及αB-晶状体蛋白与上述凋亡相关蛋白之间的相互作用.     

钩藤碱和异钩藤碱对血管紧张素Ⅱ致血管平滑肌细胞凋亡的影响及其机制

目的探讨钩藤碱和异钩藤碱对血管紧张素Ⅱ致血管平滑肌细胞凋亡的影响及其机制。方法建立血管紧张素Ⅱ诱导血管平滑肌细胞凋亡模型,通过倒置相差显微镜、激光共聚焦显微镜、流式细胞术和逆转录聚合酶链反应观察钩藤碱和异钩藤碱对细胞形态、细胞凋亡率、细胞[Ca2 ]i浓度、Bcl-2和Bax蛋白表达与mRNA转录的影响。结果钩藤碱和异钩藤碱能诱导血管平滑肌细胞凋亡,提高细胞凋亡百分率,降低细胞[Ca2 ]i浓度,下调Bcl-2蛋白表达、上调Bax蛋白表达,升高BaxmRNA/Bcl-2mRNA的比值。结论钩藤碱和异钩藤碱具有诱导血管平滑肌细胞凋亡的作用,其机制与降低细胞[Ca2 ]i浓度、下调Bcl-2蛋白表达及mRNA转录、上调Bax蛋白表达及mRNA转录有关。     

硫氧还蛋白和硫氧还蛋白相互作用蛋白与糖尿病及其并发症关系的研究进展

硫氧还蛋白系统是由硫氧还蛋白、NADPH和硫氧还蛋白还原酶三部分组成的氧化还原敏感的多功能小分子蛋白系统。硫氧还蛋白系统在细胞内外行使着多种功能,如调节细胞氧化还原状态以对抗氧化应激,激活转录因子如NF-κB和AP-1促生长,以及与ASK-1作用抑制细胞凋亡等。硫氧还蛋白相互作用蛋白\硫氧还蛋白结合蛋白2\维生素D3上调蛋白1为硫氧还蛋白结合蛋白之一,是硫氧还蛋白功能和表达的一种负性调节因子,通过抑制硫氧还蛋白系统功能而发挥介导氧化应激、诱导细胞凋亡及对抗细胞增殖等作用。高糖可以通过相互作用蛋白启动子上的CREs(碳水化合物反应元件)刺激硫氧还蛋白相互作用蛋白的产生而抑制硫氧还蛋白,进而促进氧化应激,损伤胰岛B细胞;诱导B细胞凋亡增加,促进糖尿病及其并发症的发生。因此,硫氧还蛋白相互作用蛋白或许在糖毒性和B细胞凋亡、糖尿病及其并发症之间起着重要作用。     

金雀异黄素诱导人白血病Jurkat E6-1细胞凋亡的机制

目的 探讨金雀异黄素(Gen)对Jurkat E6-1人白血病细胞的凋亡诱导作用.方法 用激光共聚焦技术观察金雀异黄素对JurkatE6-1白血病细胞形态的影响;流式细胞术检测细胞凋亡;Western印迹方法检测凋亡相关蛋白Bax、Bcl-2、Caspase3的表达.结果 Gen各浓度组瘤细胞皱缩、变形,染色质浓缩,部分核染色体碎裂,呈高蓝低红色;与1640组相比,Gen各浓度组凋亡率均呈显著增高,且随着Gen浓度的升高,凋亡率也增高;Gen 0.1、1.0、10.0 μmol/L组的Bax和Caspase-3蛋白条带强度递增,并明显高于1640组,而Bcl-2蛋白条带强度则递减,并明显低于1640组.结论 Gen对Jurkat E6-1白血病细胞可能通过上调Bax和Caspase-3蛋白表达,下调Bcl-2蛋白表达来诱导其凋亡.     

tMfn基因2对大鼠血管平滑肌细胞凋亡的影响

目的:采用腺病毒介导的去除穿膜区序列的大鼠线粒体融合素基因2(tMfn2)感染血管平滑肌细胞(VSMCs),研究其促VSMCs凋亡的作用及其相关的信号通路。方法:用携带大鼠线粒体融合素基因2(Mfn2)的腺病毒(Adv-Mfn2-GFP)和携带tMfn2基因的腺病毒(Adv-tMfn2-GFP)感染VSMCs,采用激光共聚焦显微镜技术观察tMfn2和Mfn2的融合蛋白在细胞中的定位;细胞凋亡ELISA方法、TUNEL染色法研究Mfn2、tMfn2对VSMCs凋亡的影响;Western Blot方法研究tMfn2促进VSMCs凋亡的相关信号通路。结果:激光共聚焦显微镜成像技术证实tMfn2融合蛋白主要游离于细胞质内,而Mfn2融合蛋白主要位于线粒体外膜。采用ELISA方法证实Adv-tMfn2-GFP感染组促进VSMCs凋亡作用比Adv-Mfn2-GFP感染组更显著;Adv-tMfn2-GFP感染组TUNEL染色的凋亡细胞较Adv-Mfn2-GFP感染组明显增多(P<0.05)。Western Blot结果显示,与空白对照组相比,Adv-Mfn2-GFP感染组、Adv-tMfn2-GFP感染组对应的P-Akt条带明显减弱,且后者更显著(P<0.05)。结论:tMfn2由于去除了穿膜区序列,其表达产物主要游离于细胞质中,更易于通过Ras-PI3K/Akt信号通路,抑制Akt的磷酸化,促进VSMCs凋亡,且作用较Mfn2更明显。     

HCV核心蛋白诱导HepG2细胞凋亡作用的研究

多家实验室通过酵母双杂交等技术证实 ,Ｃ蛋白可与ＴＮＦＲ 1、ＬＴ βＲ、ＮＦ κＢ及ＡＰ 1等信号分子相互作用 ,影响有关细胞凋亡的信号转导 ,但这种影响的最终结果 ,是诱导凋亡还是抑制凋亡 ,尚有争议。在建立ＨＣＶＣ区转基因细胞模型的实验过程中 ,观察到Ｃ蛋白的表达对人肝源性肿瘤细胞具毒性作用 ,进而研究证实这种细胞毒作用是由于Ｃ蛋白诱导细胞凋亡所致。将原核表达的ＨＣＶＣ蛋白通过单细胞显微注射技术导入ＨｅｐＧ2细胞胞浆内 ,观察细胞生长与增殖变化 ,并用ＡＯ/ＥＢ荧光染色和ＴＵＮＥＬ试剂检测细胞凋亡情况。结果表明 ,与…     

JNK信号转导通路与糖尿病

c-jun氨基末端激酶(JNK)是丝裂原活化蛋白激酶(MAPK)家族的成员。JNK信号转导通路参与细胞的胚胎发育、分化、凋亡等。JNK相互作用蛋白-1/(JIP-1)/IB1(islet-brain-1)是哺乳动物JNK信号转导通路的支架蛋白,通过蛋白质之间的相互作用对JNK信号转导通路起关键的调节作用。JNK信号转导通路参与β细胞凋亡、胰岛素基因表达障碍和胰岛素抵抗的发生机制。通过改变细胞中JIP-1的含量等方法抑制JNK的活性或干扰JNK与胰岛素受体底物(IRS)-1的相互作用可成为糖尿病治疗的新靶点。     

纳米材料PEG-PEI介导双基因促体外拟神经细胞凋亡的作用

目的 探讨新型纳米材料PEG-PEI介导的双基因pIRES2-EGFP/CD-5-FC和pIRES2-EGFP/TRAIL在体外对拟神经细胞模型(神经母细胞瘤株SH-SY5Y细胞)的联合杀伤作用.方法 将PEG-PEI介导的联合基因pIRES2-EGFP/CD-5-FC和pIRES2-EGFP/TRAIL转染SH-SY5Y细胞后,采用MTT法观察其对SH-SY5Y细胞的杀伤作用,荧光显微镜下观测以及流式细胞仪检测SH-SY5Y细胞凋亡率及FPEG-PEI的转染效率.结果 N/P=15时PEG-PEI转染两种目的基因中单一基因的细胞凋亡作用最强(P＜0.01);两种基因联合转染SH-SY5Y细胞时的细胞凋亡率为77％,较单一基因转染的细胞凋亡率提高了27％ (P ＜0.01).结论 CD-5 -FC和TRAIL基因在体外联合转染对SH-SY5Y细胞的杀伤作用较单一基因更强;PEG-PEI可以作为神经细胞基因靶向传输的载体行神经系统疾病基因治疗的体内实验研究.     

Attenuation of oxidative stress-induced neuronal cell death by Hydnophytum formicar-um Jack.

Objective: To investigate protective effects of Hydnophytum formicarum Jack.(H. formicarum) extracts via regulation of SIRT1-FOXO3a-ADAM10 signaling and antioxidant activity against H_2O_2-induced neurotoxicity in neuroblastoma SH-SY5Y cells. Methods: Cell viability and apoptosis of neuronal cells pretreated with H. formicarum Jack. extracts under oxidative stress were determined by MTT assay and flow cytometry. The intracellular reactive oxygen species(ROS) was performed using Carboxy-DCFDA assay. Additionally, a profile of protein expressions related to neuroprotection was detected by western blot analysis. Results: The plant extracts(methanol and ethyl acetate) elicited protective effects on the neuronal cell death as performed by the MTT assay and by apoptosis analysis via the activation of BCL-2. Both ethyl acetate and methanol extracts exerted inhibitory effects against H_2O_2-induced ROS generation in the SH-SY5Y cells. Furthermore, the possible mechanism of neuroprotection of H. formicarum Jack. was observed through its antioxidant properties by maintaining the levels of catalase and SOD2 proteins as well as activating SIRT1-FOXO3a pathway. Importantly, pretreatment of neuronal cells with H. formicarum Jack. significantly recovered the levels of ADAM10 protein compared with the H_2O_2 treatment alone. Conclusions: The recent findings suggest the protective effects of H. formicarum Jack. plant extracts on attenuating H_2O_2-induced neurotoxicity in human SH-SY5Y cells.     

三种非病毒载体对神经母瘤细胞进行转染的效果比较

目的以增强型绿色荧光蛋白(EGFP)为报告基因,研究Lipofectamine2000、改良纳米材料CS(N/P=10)和纳米粒子PAMAM(N/P=20)介导的基因导入系统对神经母瘤细胞SH-SY5Y的毒性及基因转染效率,为神经系统疾病的基因治疗奠定基础。方法制备Lipofectamine2000、CS和PAMAM与质粒DNA(pDNA)的复合物,分别转染在体外培养的人胚肾细胞Hek293和SH-SY5Y,利用噻唑蓝(MTT)比色实验比较三种载体的细胞毒性作用、用激光共聚焦显微镜观察转染后的细胞形态、倒置荧光显微镜检测转染细胞EGFP表达强度、流式细胞仪检测转染效率。结果①Lipofectamine2000、CS和PAMAM转染细胞存活率在Hek293细胞分别为73.09%、73.69%、69.24%,三者比较无显著差异;在SH-SY5Y细胞分别为67.69%、61.71%、42.92%,前两者均显著高于后者(P均<0.05)。②Hek293细胞经Lipofectamine2000和CS与pDNA的复合物分别转染后,细胞形态均未发生明显改变,保持梭状生长;而PAMAM/pDNA复合物转染后,细胞发生皱缩,呈圆形分布生长。经三种载体转染后的SH-SY5Y细胞均发生形态改变,其中PAMAM/pDNA复合物转染者形态改变程度相对较大。Hek293细胞和SH-SY5Y细胞中,均以Lipofectamine2000/pDNA复合物转染者EGFP表达强度最大,其次为CS/pDNA复合物、PAMAM/pDNA复合物转染者。④Lipofectamine2000、CS和PAMAM的转染效率在Hek293细胞分别为60.9%、45.2%、42.7%,前者显著高于后两者(P均<0.05);在SH-SY5Y细胞分别为25.3%、19.2%、8.9%,前两者均显著高于后者(P均<0.05)。结论 Lipofectamine2000为目前最适于神经系统疾病基因治疗研究的非病毒载体;改良后的新纳米材料CS毒性比PAMAM小、转染效率比PAMAM高,有望在神经系统疾病研究中得到进一步运用。     

川陈皮素抑制Aβ25~35诱导的SH-SY5Y细胞氧化应激与凋亡作用

目的探讨川陈皮素对β淀粉样蛋白(Aβ)25~35诱导的SH-SY5Y细胞损伤的保护作用及潜在机制。方法SH-SY5Y细胞培养至对数生长期,分为正常对照组、Aβ_25~35损伤组及川陈皮素25、50、100μmol/L组,培养24 h后检测细胞存活率、氧化应激水平、凋亡率、凋亡相关基因及磷酸化-蛋白激酶B(p-Akt)、磷酸化-雷帕霉素靶蛋白(p-mTOR)蛋白表达等指标。结果与Aβ_25~35损伤组比较,川陈皮素各浓度处理组SH-SY5Y细胞的存活率显著增加(P<0.05),而乳酸脱氢酶(LDH)活性显著降低(P<0.05);与Aβ_25~35损伤组比较,川陈皮素各浓度处理组SH-SY5Y细胞谷胱甘肽过氧化酶(GSH-Px)、过氧化氢酶(CAT)活性显著增加(P<0.05),而丙二醛(MDA)含量显著降低(P<0.05);给予不同浓度川陈皮素处理后,与Aβ_25~35损伤组比较,SH-SY5Y细胞凋亡率、Bax mRNA表达显著降低(P<0.05),而Bcl-2 mRNA、Bcl-2/Bax值、p-Akt及p-mTOR蛋白表达显著增加(P<0.05)。结论川陈皮素可以通过调控Akt/mTOR通路抑制Aβ_25~35诱导的SH-SY5Y细胞氧化应激及凋亡,进而对Aβ_25~35诱导的SH-SY5Y细胞损伤产生保护作用。     

参知健脑片组分对β淀粉样蛋白致SH—SY5Y细胞凋亡的保护作用

目的 为参知健脑片（SZJ）的临床应用奠定基础。方法 以参知健脑片组分作用于人神经母细胞瘤细胞株（SH—SY5Y）模型,用具有神经营养作用的APP17肽为对照药物。分组给药并培养24h,以倒置相差显微镜观察SH-SY5Y细胞形态;CCK-8法检测细胞存活率;用流式细胞仪定量分析细胞凋亡峰,以2’,7＇-二氢二氯荧光黄双乙酸钠（DCFH-DA）为标记探针检测细胞内活性氧水平。结果 参知健脑片处理细胞24h后,与其他各组比较,SH-SY5Y细胞存活率明显升高;细胞形态明显改变;凋亡率明显降低,细胞内活性氧水平明显降低,P均〈0．01。结论 参知健脑片能抑制SH-SY5Y细胞凋亡,其神经细胞保护作用可能与降低细胞内活性氧水平有关。     

NPM/ALK binds and phosphorylates the RNA/DNA-binding protein PSF in anaplastic large-cell lymphoma

The oncogenic fusion tyrosine kinase nucleophosmin/anaplastic lymphoma kinase (NPM/ALK) induces cellular transformation in anaplastic large-cell lymphomas (ALCLs) carrying the t(2;5) chromosomal translocation. Protein-protein interactions involving NPM/ALK are important for the activation of downstream signaling pathways. This study was aimed at identifying novel NPM/ALK-binding proteins that might contribute to its oncogenic transformation. Using a proteomic approach, several RNA/DNA-binding proteins were found to coimmunoprecipitate with NPM/ALK, including the multifunctional polypyrimidine tract binding proteinassociated splicing factor (PSF). The interaction between NPM/ALK and PSF was dependent on an active ALK kinase domain and PSF was found to be tyrosine-phosphorylated in NPM/ALK-expressing cell lines and in primary ALK(+) ALCL samples. Furthermore, PSF was shown to be a direct substrate of purified ALK kinase domain in vitro, and PSF Tyr293 was identified as the site of phosphorylation. Y293F PSF was not phosphorylated by NPM/ALK and was not delocalized in NPM/ALK(+) cells. The expression of ALK fusion proteins induced delocalization of PSF from the nucleus to the cytoplasm and forced overexpression of PSF-inhibited proliferation and induced apoptosis in cells expressing NPM/ALK. PSF phosphorylation also increased its binding to RNA and decreased the PSF-mediated suppression of GAGE6 expression. These results identify PSF as a novel NPM/ALK-binding protein and substrate, and suggest that PSF function may be perturbed in NPM/ALK-transformed cells.     

Molecular cloning and characterization of a cellular phosphoprotein that interacts with a conserved C-terminal domain of adenovirus E1A involved in negative modulation of oncogenic transformation.

The adenovirus type 2/5 E1A proteins transform primary baby rat kidney (BRK) cells in cooperation with the activated Ras (T24 ras) oncoprotein. The N-terminal half of E1A (exon 1) is essential for this transformation activity. While the C-terminal half of E1A (exon 2) is dispensable, a region located between residues 225 and 238 of the 243R E1A protein negatively modulates in vitro T24 ras cooperative transformation as well as the tumorigenic potential of E1A/T24 ras-transformed cells. The same C-terminal domain is also required for binding of a cellular 48-kDa phosphoprotein, C-terminal binding protein (CtBP). We have cloned the cDNA for CtBP via yeast two-hybrid interaction cloning. The cDNA encodes a 439-amino acid (48 kDa) protein that specifically interacts with exon 2 in yeast two-hybrid, in vitro protein binding, and in vivo coimmunoprecipitation analyses. This protein requires residues 225-238 of the 243R E1A protein for interaction. The predicted protein sequence of the isolated cDNA is identical to amino acid sequences obtained from peptides prepared from biochemically purified CtBP. Fine mapping of the CtBP-binding domain revealed that a 6-amino acid motif highly conserved among the E1A proteins of various human and animal adenoviruses is required for this interaction. These results suggest that interaction of CtBP with the E1A proteins may play a critical role in adenovirus replication and oncogenic transformation.     

Melatonin reduces induction of Bax, caspase and cell death in methamphetamine-treated human neuroblastoma SH-SY5Y cultured cells

Abstract:  Several studies demonstrated that methamphetamine (MA)-treated human neuroblastoma cells exhibit increased oxidative stress, which regulates intracellular signaling cascades leading to cell death. Melatonin has a potential as a direct free radical scavenger and protects against cell death caused by MA. The objective of this study was to investigate the neuroprotective properties of melatonin on MA-induced induction of death signaling cascade and neuronal cell degeneration in human neuroblastoma SH-SY5Y cultured cells. The results of the present study demonstrate that MA significantly reduced cell viability in SH-SY5Y cultured cells. Desipramine, a monoamine uptake blocker, and melatonin reversed the toxic effect of MA in reducing cell viability. Induction of Bax, Bcl-2 and cleaved caspase-3 protein levels were observed in SH-SY5Y cultured cells treated with MA, whereas the induction of Bax and cleaved caspase-3 was diminished by melatonin. Visualization of the induction of Bax using immunofluorescence but a reduction in mitochondrial sites using red-fluorescent mitochondria-staining dye was more obviously apparent in MA-treated cells than in untreated control cells and, again, this effect was abolished by melatonin. These findings demonstrate important roles of Bax and caspase in death signaling cascade, and the protective effects of melatonin in MA-treated SH-SY5Y cells.     

日本血吸虫双价DNA疫苗体内外表达及持续时间的初步研究

目的观察日本血吸虫双价DNA疫苗在体内外表达及体内表达的持续时间。方法将构建的共表达日本血吸虫双价核酸疫苗pVIVO2-SjFABP/Sj23瞬时转染HEK-293细胞,通过逆转录(RT-PCR)和间接免疫荧光试验(IFAT)检测真核细胞中SjFABP和Sj23基因及蛋白的表达。质粒经股四头肌注射免疫BALB/c小鼠12只,每月眼眶采血,并活体灌流小鼠2只,IFAT检测重组蛋白的原位表达,Westernblot法检测血清中特异性抗体,持续观察6个月。结果RT-PCR和IFAT证明质粒pVIVO2-SjFABP/Sj23能在体外表达。免疫后连续6个月,IFAT均检测到小鼠骨骼肌注射部位重组蛋白的原位表达,但Westernblot未检测到血清中特异性抗体的存在。结论日本血吸虫双价DNA疫苗在HEK-293细胞和小鼠骨骼肌中均能够正确地表达,体内表达持续时间至少在6个月以上。