人CYB5R2基因真核表达载体的构建

目的 构建人CYB5R2基因真核表达载体,并观察其在人鼻咽癌细胞HONE1中的表达.方法 根据表达载体pCMV-Tag3A上的多克隆位点和CYB5R2基因CDS序列设计引物,应用RT-PCR从人睾丸cDNA中克隆出CYB5R2的CDS,并进行TA克隆.对经PCR、双酶切和双向测序验证正确的质粒,进行CDS目的 片段的回收,将其连接于pCMV-Tag3A载体的多克隆位点内构建真核载体,然后进行PCR、双酶切和双向测序验证.脂质体法转染鼻咽癌细胞HONE1细胞,荧光显微镜观察和RT-PCR验证该基因的表达.结果 PCR、双酶切和双向测序结果显示pCMV-Tag3-CYB5R2-CDS真核表达载体构建成功,荧光显微镜和RT-PCR的结果显示该重组质粒在HONE1细胞中正确表达.结论 成功构建了pCMV-Tag3-CYB5R2-CDS真核表达载体,并在鼻咽癌细胞HONE1中表达,为进一步验证其抑癌作用及探索其抑癌机制做准备.     

pEGFP-hApelin-R重组真核表达载体的构建及在HEK293细胞中的表达

目的构建与增强型绿色荧光蛋白（enhanced green fluorescent protein,EGEP）融合的人apelin受体（Apelin receptor,apelin-R）真核表达载体。方法以质粒pcDNA3.1-hApelin-R为模板,PCR方法扩增人apelin受体。扩增的人apelin受体用EcoRⅠ和BamHⅠ双酶切,同时用这两种酶双酶切质粒peGFP-C1。然后将两种酶切产物按常规方法连接、转化大肠杆菌Top10。挑取菌落培养,提取质粒,然后进行酶切鉴定,最后进行测序。将测序正确的重组载体用脂质体法转染人胚胎肾（human embryonic kidney293,HEK293）细胞,共聚焦显微镜观察。提取转染细胞的总蛋白,进行Westernblot检测。结果扩增出一条约1200bp的片段,与预期的apelin受体大小相符。酶切结果显示,重组质粒pEGFP-hApelin-R被切成两条片段,其中一条为peGFP-C1载体大小,另一条为目的片段大小。经测序鉴定,序列与GenBank（NM_005161）中的序列高度同源。共聚焦显微镜观察显示,人apelin受体主要在细胞膜上表达。Westernblot结果显示在相对分子质量69000处有一蛋白条带,与预期大小相符。结论构建成功pEGFP-hApelin-R重组表达载体,此表达载体可用于检测apelin受体和κ型阿片受体（kappa opioid receptor,KOR）或与其他受体间的相互作用。     

人STIM1基因真核表达载体的构建及其在肝细胞中的表达

目的: 构建人STIM1基因真核表达载体, 并观察其在人肝细胞株(HL-7702)中的表达.方法: 提取HL-7702细胞总RNA, RT-PCR扩增,经纯化回收后将片段克隆至pGM-T载体, 酶切琼脂糖凝胶电泳分析鉴定并测序, 最后用重组质粒转染HL-7702细胞, 通过PCR-电泳和Western blot法检测STIM1基因的表达.结果: PCR扩增的片段长度为342 bp, 测序结果以及重组质粒pGM-T-STIM1的酶切琼脂糖凝胶电泳鉴定结果均证明STIM1基因成功克隆到真核表达载体中. PCR-电泳和Westernb l o t实验结果分别显示转染重组质粒后的HL-7702细胞在基因与蛋白水平表达STIM1均有所增强.结论: 成功构建了人STIM1基因的真核表达载体pGM-T-STIM1, 并在人肝细胞株HL-7702中稳定表达, 为研究STIM1蛋白在人肝细胞内Ca2+浓度调控方面及其对人肝细胞分泌功能的影响奠定了良好的实验基础.     

人Dact2基因真核表达载体的构建及其在结肠癌细胞中的表达

目的构建人Dact2基因真核表达载体。方法以人胎肝cDNA文库为模板,利用RT—PcR方法获得Dact2编码序列,构建并鉴定表达Dact2的pcMV6-Entry—GFP真核表达载体。Lipofectamine 2000转染结肠癌细胞株HT29,荧光显微镜和流式细胞仪观察和分析转染效率,westernblot检测Dact2蛋白表达。结果通过PcR扩增获得了2322bp的Dac￡2编码序列,通过酶切及测序证实Dact2序列正确插入真核表达载体pcMV6-Entry—GFP;转染空载体和Dact2表达质粒48h后,荧光显微镜下观察,可见两组细胞均表达绿色荧光蛋白,流式细胞仪分析结果显示瞬时转染效率分别为41．36％和39．88％。Western blot检测证实转染表达质粒组的细胞Dact2蛋白呈阳性表达。结论成功构建了人Dact2真核表达载体,为其功能研究奠定了基础。     

甲型流感病毒M2基因真核表达载体的构建及序列分析

目的 构建含有甲型流感病毒M2基因的真核表达载体并分析插入的M2基因序列。方法从接种人流感病毒株A／PR／8／34（H1N1）的鸡胚尿囊液中提取病毒RNA，用特异引物进行RT-PCR，扩增M2基因。通过分子克隆技术将所扩增片段克隆入真核表达质粒载体pcDNA3．1（＋）。经双酶切、PCR鉴定后挑选阳性克隆测序鉴定并对插入的M2基因序列进行分析。结果经双酶切、PCR及测序鉴定证实M2基因的真核表达载体构建成功。序列分析有4个氨基酸出现变异，提交Genbank进行Blast比对显示同源性97％（Genbank／NCBI AY768951）。结论M2四聚体蛋白具有H^＋通道功能，能够协助病毒与宿主细胞膜融合后释放RNP复合体，还能稳定HA蛋白的结构。M2蛋白的高度保守性和具有交叉保护能力特性使之成为新型的通用流感疫苗的突破口。该结果将为甲型流感病毒基因工程疫苗，通用疫苗和核酸疫苗的研究打下基础。     

带有Flag标签的ZNF580真核表达载体的构建及扩增

目的 构建并扩增带有Flag标签的ZNF580真核表达载体,用于免疫共沉淀实验.方法 pGB-ZNF580质粒进行SfiI酶切,琼脂糖电泳,切胶并纯化回收ZNF580片段,与同样酶切的真核表达载体pCDEF-Flag连接构建重组质粒pCDEF-Flag-ZNF580.重组质粒转化细菌感受态,铺于氨苄抗性LB平板,37℃培养箱过夜,挑取转化了重组质粒的单克隆接种于液体LB培养基中摇床培养4～8h.从大肠杆菌中提取质粒酶切鉴定及送Takara公司测序鉴定.结果 成功构建重组质粒pCDEF-Flag-ZNF580并转化细菌感受态,于大肠杆菌中扩增得到足够用于细胞转染和免疫共沉淀实验的重组质粒,Takara测序结果显示重组质粒序列完全正确.结论 成功构建和扩增了重组质粒pCDEF-Flag-ZNF580,为后续进行真核细胞的转染及免疫共沉淀实验奠定了基础.     

人miR-205真核表达载体的构建及鉴定

目的构建真核表达载体pcDNA3.1(+)-miR-205,并使其在肾上腺皮质癌细胞SW-13中稳定表达。方法依据miRbase数据库中pre-miR-205序列设计引物,PCR扩增pre-miR-205基因并将其克隆至线性化的pcD-NA3.1(+)质粒中,获得重组表达载体pcDNA3.1(+)-miR-205,经双酶切及测序分析后,将其及对照空载体转染肾上腺皮质癌SW-13细胞,采用实时定量RCR法鉴定miR-205在SW-13细胞中表达。结果酶切和测序结果均证实pcDNA3.1(+)-205重组质粒构建成功,经实时定量RCR检测表明转染pcDNA3.1(+)-205的SW-13细胞中miR-205阳性高表达。结论真核表达载体pcDNA3.1(+)-205在SW-13中稳定转染,为进一步研究miR-205在肾上腺皮质癌细胞SW-13中的功能及基因调控机制奠定了实验基础。     

肝细胞生长因子受体靶向shRNA真核表达载体的构建和鉴定

目的：构建和鉴定人肝细胞生长因子受体（cMet）的shRNA的真核表达载体。方法：人工合成针对cMet的4对shRNA序列并定向克隆到siRNA（small interference RNA）真核表达载体RNAi-Ready pSIREN-DNA-DsRed-Express Vector上；采用双酶切和测序法鉴定。结果：酶切及测序鉴定得到的产物与预期的目的基因一致。结论：成功构建肝细胞生长因子受体靶向shRNA的真核表达载体。     

APP基因真核表达载体的构建及其在SH-SY5Y细胞中的稳定表达

目的 构建淀粉样前体蛋白(APP)基因真核表达载体,转染SH-SY5Y细胞,建立稳定转染细胞系.方法 从质粒pcDNAs-APP中经PCR扩增出APP基因,利用DNA重组技术将其插入到真核表达载体pcDNA3.1(+)中,经酶切和测序鉴定后,脂质体转染法转染SH-SY5Y细胞,通过G418选择培养,建立稳定转染细胞系,通过印迹法(Western blot)检测APP的表达. 结果 pcDNA3.1(+)-APP重组体经PCR扩增后片段大小约为2 300 bp,与预期相同.测序结果与目的序列相同,重组体载体构建成功.Western印迹检测到SH-SY5Y细胞中APP的表达. 结论 成功构建pcDNA3.1(+)-APP真核表达载体并稳定转染SH-SY5Y细胞,成功表达了目的基因,为进一步研究阿尔茨海默病分子学机制奠定了基础.     

靶向LIMK1的siRNA真核表达载体（pSUPER-LIMK1）的构建、鉴定及在人成骨肉瘤MG63细胞中的表达

目的 构建靶向人LIMK1的siRNA 真核表达载体(pSUPER-LIMK1)并检测其在人成骨肉瘤MG63细胞中进行表达.方法 将设计的LIMK1的siRNA的寡聚脱氧核苷酸链与真核表达载体pSUPER连接,构建重组pSUPER-LIMK1真核表达载体,并将其转染入MG63细胞株中.采用RT-PCR检测pSUPER-LIMK1质粒转染后LIMK1在人成骨肉瘤中的基因表达,Western blot检测LIMK1蛋白的表达.结果 构建的真核表达载体pSUPER-LIMK1可在人成骨肉瘤MG63细胞中的表达.结论 构建的人LIMK1-siRNA蛋白的真核表达载体pSUPER-LIMK1,为进一步骨肉瘤基因靶向治疗的研究奠定了基础.     

Resveratrol and Pterostilbene Inhibit SARS-CoV-2 Replication in Air–Liquid Interface Cultured Human Primary Bronchial Epithelial Cells

The current COVID-19 pandemic is caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) and has an enormous impact on human health and economy. In search for therapeutic options, researchers have proposed resveratrol, a food supplement with known antiviral, anti-inflammatory, and antioxidant properties as an advantageous antiviral therapy for SARS-CoV-2 infection. Here, we provide evidence that both resveratrol and its metabolically more stable structural analog, pterostilbene, exhibit potent antiviral properties against SARS-CoV-2 in vitro. First, we show that resveratrol and pterostilbene antiviral activity in African green monkey kidney cells. Both compounds actively inhibit virus replication within infected cells as reduced virus progeny production was observed when the compound was added at post-inoculation conditions. Without replenishment of the compound, antiviral activity was observed up to roughly five rounds of replication, demonstrating the long-lasting effect of these compounds. Second, as the upper respiratory tract represents the initial site of SARS-CoV-2 replication, we also assessed antiviral activity in air–liquid interface (ALI) cultured human primary bronchial epithelial cells, isolated from healthy volunteers. Resveratrol and pterostilbene showed a strong antiviral effect in these cells up to 48 h post-infection. Collectively, our data indicate that resveratrol and pterostilbene are promising antiviral compounds to inhibit SARS-CoV-2 infection. Because these results represent laboratory findings in cells, we advocate evaluation of these compounds in clinical trials before statements are made whether these drugs are advantageous for COVID-19 treatment.     

preS2S/adw真核表达质粒构建及其表达的初步研究

目的：针对我国乙型肝炎（乙肝）病毒流行的血清型，采用美国药品及食物鉴定委员会承认的应用于疫苗临床使用的载体pVAX1，构建了肝病毒adw血清型核酸疫苗preS2S的真核表达质粒，对其在真核细胞中的表达进行初步研究。方法：采用PCR法扩增preS2S片段，插入pVAX1载体中，测定DNA序列后，转染SP2／0细胞，抽提转染后SP2／0细胞的总RNA，再用RT－PCR法扩增其中的preS2S片段，以检测其表达的基础，结果：测序证实了该片段为乙肝病毒adw型preS2S基因。PCR扩增法检测出的转染细胞中存在preS2S基因，结论：获得了adw血清型乙肝病毒preS2S的真核表达质粒，提示其能够在真核细胞中表达目的基因蛋白。     

Heparin Inhibits SARS-CoV-2 Replication in Human Nasal Epithelial Cells

SARS-CoV-2 is the causative agent of the COVID-19 pandemic. Vaccination, supported by social and public health measures, has proven efficacious for reducing disease severity and virus spread. However, the emergence of highly transmissible viral variants that escape prior immunity highlights the need for additional mitigation approaches. Heparin binds the SARS-CoV-2 spike protein and can inhibit virus entry and replication in susceptible human cell lines and bronchial epithelial cells. Primary infection predominantly occurs via the nasal epithelium, but the nasal cell biology of SARS-CoV-2 is not well studied. We hypothesized that prophylactic intranasal administration of heparin may provide strain-agnostic protection for household contacts or those in high-risk settings against SARS-CoV-2 infection. Therefore, we investigated the ability of heparin to inhibit SARS-CoV-2 infection and replication in differentiated human nasal epithelial cells and showed that prolonged exposure to heparin inhibits virus infection. Furthermore, we establish a method for PCR detection of SARS-CoV-2 viral genomes in heparin-treated samples that can be adapted for the detection of viruses in clinical studies.     

SARS-CoV-2 Virion Infectivity and Cytokine Production in Primary Human Airway Epithelial Cells

The emergence of new SARS-CoV-2 variants and the replacement of preceding isolates have been observed through B.1.1.7, B.1.351, B.1.617.2, and B.1.1.529 lineages (corresponding to alpha, beta, delta, and omicron variants of concern (VoC), respectively). However, there is still a lack of biological evidence to which extent those VoC differ from the ancestral lineages. By exploiting human airway epithelial cell (HAEC) cultures, which closely resemble the human airway architecture and physiology, we report distinctive SARS-CoV-2 tropism in different respiratory tissues. In general, SARS-CoV-2 VoC predominantly infect and replicate in HAEC better than the progenitor USA-WA1 isolate or the BavPat1 isolate, which contains the D614G mutation, even though there is little to no difference between variants regarding their infectivity (i.e., virion-per-vRNA copy ratio). We also observe differential tissue-specific innate immunity activation between the upper and lower respiratory tissues in the presence of the virus. Our study provides better comprehension of the behavior of the different VoC in this physiologically relevant ex vivo model.     

霍乱弧菌ctxB基因真核重组质粒的构建及表达

目的构建霍乱孤菌ctxB基因真核表达重组质粒,并在NIH3T3细胞中进行表达。方法用限制性核酸内切酶从重组质粒pET32a-ctxB上切下ctxB基因,导入真核表达载体pcDNA3·1( ),重组子经限制性酶切分析、PCR鉴定正确后,命名为pcDNA3·1-ctxB。用脂质体法将重组质粒pcDNA3·1-ctxB转染NIH3T3细胞,采用免疫荧光法对pcDNA3·1-ctxB的瞬时表达产物进行鉴定。结果约380bp的ctxB被克隆到pcDNA3·1( )真核表达载体中,经测序无误后,用阳离子脂质体转染的方法,检测到重组质粒pcDNA3·1-ctxB在NIH3T3细胞的胞浆和胞膜上得到了表达。结论ctxB真核表达的成功构建及表达为进一步从分子水平研究霍乱肠毒素B亚单位的免疫原性及其作为佐剂的应用价值提供研究基础。     

鼠白细胞介素3真核表达质粒的构建及鉴定

利用鼠白细胞介素3（IL－3）基因构建真核表达质粒,筛选获得的阳性克隆经限制性内切酶酶切鉴定和基因测序,证明小鼠IL－3基因正确克隆到pCDNA3真核表达载体上;将获得的真核表达质粒pCDNA3IL－3转化大肠杆菌细胞,增菌培养后大量提取pCDNA3IL－3质粒,经紫外分光光度计检测其纯度和浓度,用于小鼠抗生育DNA疫苗在免疫小鼠模型的免疫增强佐剂。     

SARS-CoV-2 Spike Expression at the Surface of Infected Primary Human Airway Epithelial Cells

Different serological assays were rapidly generated to study humoral responses against the SARS-CoV-2 Spike glycoprotein. Due to the intrinsic difficulty of working with SARS-CoV-2 authentic virus, most serological assays use recombinant forms of the Spike glycoprotein or its receptor binding domain (RBD). Cell-based assays expressing different forms of the Spike, as well as pseudoviral assays, are also widely used. To evaluate whether these assays recapitulate findings generated when the Spike is expressed in its physiological context (at the surface of the infected primary cells), we developed an intracellular staining against the SARS-CoV-2 nucleocapsid (N) to distinguish infected from uninfected cells. Human airway epithelial cells (pAECs) were infected with authentic SARS-CoV-2 D614G or Alpha variants. We observed robust cell-surface expression of the SARS-CoV-2 Spike at the surface of the infected pAECs using the conformational-independent anti-S2 CV3-25 antibody. The infected cells were also readily recognized by plasma from convalescent and vaccinated individuals and correlated with several serological assays. This suggests that the antigenicity of the Spike present at the surface of the infected primary cells is maintained in serological assays involving expression of the native full-length Spike.     

pEGFP-C3-hNIS重组质粒的构建及其在人胃癌BGC-823细胞的表达

目的构建人钠碘转运体（hNIS）基因真核绿色荧光蛋白融合表达载体pEGFP-C3-hNIS,并研究重组hNIS基因在人胃癌BGC-823细胞中的表达情况。方法采用Trizol一步法从甲状腺手术患者的甲状腺组织中提取总RNA,利用RT-PCR方法扩增得到hNIS的可编码区基因,并克隆到T载体上,测序后亚克隆到真核绿色荧光蛋白融合表达载体pEGFP-C3的多克隆位点,获得重组真核表达载体pEGFP-C3-hNIS。分别将pEGFP-C3-hNIS重组质粒（实验组）和pEGFP-C3（对照组）瞬时转染至人胃癌BGC-823细胞中,转染48 h后,于荧光显微镜下观察绿色荧光蛋白在细胞中的表达情况,并通过Western blot方法检测hNIS基因的蛋白表达水平。结果序列分析证实克隆片段与GenBank公布的hNIS基因序列（序列号：NM-000453）相似性达99.90%。转染48 h后,实验组与对照组细胞均可观察到较强绿色荧光信号,用hNIS基因特异性抗体检测表明实验组hNIS表达水平明显高于对照组。结论成功构建hNIS真核绿色荧光蛋白融合表达载体pEGFP-C3-hNIS,并能在人胃癌BGC-823细胞中高表达。