抗果蝇MRJ蛋白单克隆抗体的制备和鉴定

制备抗果蝇MRJ蛋白单克隆抗体可用于研究果蝇mrj的生物学功能,使用IPTG诱导重组质粒pET28a-mrj在大肠杆菌Rosetta中表达,重组蛋白经过Ni-IDA凝胶柱亲和纯化后免疫BALB/c小鼠。然后取免疫好的小鼠的脾脏细胞与小鼠骨髓瘤细胞SP2/0融合,经克隆和筛选获得了能分泌抗果蝇MRJ蛋白单克隆抗体的杂交瘤细胞株。腹水制备后获得单克隆抗体,通过ELISA和Western Blot对所获得的抗体进行鉴定,结果表明所制备单克隆抗体能够特异性结合于原核及真核细胞表达的MRJ蛋白,可用于研究mrj基因的生物学功能。     

金黄色葡萄球菌肠毒素C3单克隆抗体的制备与鉴定

目的制备稳定分泌抗金黄色葡萄球菌肠毒素C3（SEC3）单克隆抗体的杂交瘤细胞株,并对单克隆抗体的性质进行鉴定。方法以SEC3重组蛋白免疫Balb／c小鼠,应用细胞融合技术将小鼠的脾细胞与sR／0骨髓瘤细胞进行融合,经间接ELISA法检测筛选及2次有限稀释法克隆化培养,获得目的杂交瘤细胞株,并对其所产生的单克隆抗体进行效价、亲和常数及抗原识别表位等相关性质的鉴定。结果最终获得了两株能分泌单克隆抗体的杂交瘤细胞1C12和2A2,两者细胞培养上清的效价分别为1：3200和1：1600。经分析可知1C12细胞株的亲和力高于2A2细胞株,同时相加实验表明两个单克隆抗体识别抗原表位相同。结论单克隆抗体制备成功,为进一步完善肠毒素SEC3的临床检测奠定了基础。     

人凝血因子Ⅶ单克隆抗体的制备与鉴定

目的：制备抗人凝血因子Ⅶ单克隆抗体并鉴定其特性。方法：应用杂交瘤融合技术,以重组人凝血因子Ⅶ为抗原免疫BALB／c小鼠;取免疫小鼠的脾细胞与Sp2／0骨髓瘤细胞融合,经间接ELISA法筛选、融合细胞有限稀释法克隆、克隆化杂交瘤细胞株的亚类鉴定等方法筛选出单克隆抗体杂交瘤细胞株,并对单克隆抗体的特异性进行鉴定;用杂交瘤细胞株诱生小鼠腹水,应用蛋白A亲和层析法进行单抗的纯化。结果：获得了3株可稳定分泌单克隆抗体的杂交瘤细胞3E8、3D2和1C5,诱生的腹水效价分别为1：1×10^7、1：1×10^6和1：1×10^6;亚类鉴定表明388为IgG2a,其余2株均为IgGl;特异性鉴定显示它们与多种血浆蛋白均无交叉反应,表明单抗是特异的;经过亲和层析,获得了纯化的单抗。结论：获得了特异性的人凝血因子Ⅶ单克隆抗体,为建立人凝血因子Ⅶ检测及纯化方法奠定了基础。     

活化相关分泌蛋白1单克隆抗体的制备及其在保守结构域鉴定中的应用

目的:制备重组活化相关分泌蛋白1(ASP-1)的单克隆抗体,并用其鉴定保守结构域。方法:用原核表达并纯化的重组ASP-1不加佐剂免疫BALB/c小鼠,采用杂交瘤技术及有限稀释传代法筛选稳定分泌特异性抗体的杂交瘤细胞株,制备单抗腹水后用间接ELISA进行抗体特异性鉴定和效价检测,利用肽结合ELISA和Western印迹鉴定单抗识别的保守结构域。结果:获得5株能稳定分泌抗ASP-1单克隆抗体的杂交瘤细胞株,且5株单抗的识别区域均为21~28氨基酸残基的保守性结构域。结论:制备了抗ASP-1的单克隆抗体,为深入研究ASP-1佐剂的活性功能区及作用机制提供了有效工具。     

EpCAM蛋白的表达、纯化及其单克隆抗体的制备

目的:原核表达EpCAM蛋白并制备抗EpCAM特异性单克隆抗体,初步鉴定相应单克隆抗体的特性。方法:PCR扩增EpCAM基因胞外区,将目的基因亚克隆至载体pET-28a(+),转化至大肠埃希菌株BL21,IPTG诱导表达,组氨酸亲和层析法纯化表达产物。纯化蛋白免疫BALB/c小鼠,将成功免疫的小鼠脾细胞与骨髓瘤SP2/0细胞融合,经ELISA筛选得到分泌特异性抗EpCAM的单克隆抗体的细胞株,免疫BALB/c小鼠进一步制备相应的单克隆抗体,并通过Western blot(蛋白质印记)和FACS(流式细胞分析)鉴定单抗的特异性及生物学活性。结果:成功构建重组表达载体pET28a-EpCAM并在大肠杆菌中获得表达,经His-tag亲和层析法获得纯化的EpCAM重组蛋白。EpCAM重组蛋白免疫的BALB/c小鼠的脾细胞与SP2/0细胞融合、筛选,获得两株稳定分泌EpCAM抗体的杂交瘤细胞株,分别命名为4B2、2F2并免疫BALB/c小鼠获得相应的单克隆抗体。Western blot结果显示4B2腹水纯化所得单抗能够识别FaDu细胞系(人咽鳞癌细胞)中的EpCAM蛋白,但2F2未能识别FaDu细胞中的变性的EpCAM蛋白。FACS结果显示两者均能和FaDu细胞中天然的EpCAM蛋白结合。讨论:成功制备了抗EpCAM的单克隆抗体,并能够识别人咽鳞癌细胞系FaDu中表达的EpCAM,为进一步研究EpCAM抗体在肿瘤治疗中的作用提供基础。     

抗人B7-H1单克隆抗体的制备和鉴定

目的:采用杂交瘤技术制备抗人B7-H1单克隆抗体,并对其进行鉴定。方法:经抗原免疫的小鼠脾细胞与小鼠骨髓瘤细胞以常规方法融合;用间接ELISA法筛选分泌抗体的杂交瘤细胞株;阳性克隆用有限稀释法获得稳定分泌抗人B7-H1单克隆抗体的杂交瘤细胞株;扩增杂交瘤细胞注射进小鼠腹腔后制备腹水;纯化腹水中的单克隆抗体并对其亚型进行鉴定;用间接ELISA法测抗体效价;将肺癌组织制成石蜡切片,用抗人B7-H1抗体进行免疫组化染色。结果:获得1株稳定分泌抗人B7-H1单克隆抗体的杂交瘤细胞株,所分泌的单抗类型为IgG1;抗体效价为1×108,纯化后的抗体含量为6.76g/L;免疫组化实验中,单抗可与肺癌组织表面的B7-H1蛋白特异地结合。结论:制备了人B7-H1单克隆抗体,为B7-H1检测试剂盒的研制奠定了基础。     

抗羊口疮病毒ORFV118蛋白单克隆抗体的制备、鉴定及其应用

制备抗羊口疮病毒118(ORFV118)重组蛋白的单克隆抗体并鉴定其生物学特性。构建ORFV118原核表达重组质粒pET33b-ORFV118,将重组质粒转化大肠杆菌BL21,诱导表达出ORFV118重组蛋白;利用Ni-NTA亲和层析法纯化ORFV118重组蛋白;以纯化蛋白为抗原免疫小鼠,通过杂交瘤技术制备单克隆抗体;利用间接ELISA法、Western blot、免疫组化等方法分别对单抗特异性、效价、亚型以及ORFV118蛋白的功能进行研究。获得了3株稳定分泌单克隆抗体的细胞株,分别命名为1A2,3B5,5D10,它们诱生的小鼠腹水效价分别为110 000,16 400,18 000。其中效价最高的1A2抗体亚型为IgG1,能特异性结合其免疫原蛋白、真核表达产物以及病羊皮肤组织中的ORFV118蛋白。免疫组化结果显示单抗1A2染色局限于皮肤表皮层角化细胞及浸润至皮下组织的炎症细胞,与病毒侵染上皮组织层的特性相符。制备的单抗1A2能特异性识别ORFV118。深入研究单抗1A2将为了解ORFV118的生物学特性,为羊传染性脓疱病的诊断、预防与治疗提供可能和新思路。     

抗登革病毒2型E蛋白单克隆抗体的制备和生物学特性的鉴定

为了制备可用于胶体金快速检测试纸条的抗登革病毒2型（DEN2）E蛋白单克隆抗体（mAb）,通过基因克隆获得E基因与质粒pET32a（＋）的重组质粒,将重组质粒转化入大肠杆菌BL21,IPGT诱导表达重组蛋白。以DEN2重组E蛋白免疫BALB／c小鼠,采用杂交瘤技术制备抗DEN2E蛋白的mAb,以间接ELISA法和Western blot进行mAb特异性鉴定;同时采用间接ELISA法鉴定mAb的Ig亚类。结果表明获得1株可分泌特异性mAb的杂交瘤细胞（7C7）,其抗体亚类为IgG1。Western blot显示该株mAb能特异识别重组pET32a-DEN2E蛋白。因此,成功制备出抗DEN2E的1株mAb,为建立快速特异橙测登革病毒感染的实验方法提供了有力的工具。     

茶尺蠖核型多角体病毒多角体蛋白单克隆抗体的制备

为了建立一种基于免疫反应检测茶尺蠖核型多角体病毒的方法,以纯化后的茶尺蠖核型多角体病毒作为抗原,免疫BALB/c小鼠,将小鼠脾脏细胞与小鼠骨髓瘤细胞Sp2/0融合,经间接ELISA筛选及克隆得到了一株稳定分泌单克隆抗体的杂交瘤细胞株,命名为7D3。同时克隆并在大肠杆菌中表达了EoNPV多角体蛋白基因,获得重组多角体蛋白。经Western blotting鉴定,该抗体可与EoNPV的多角体蛋白特异性结合。利用制备EoNPV多角体蛋白的单克隆抗体,建立了间接ELISA测定EoNPV的方法。     

猪脑心肌炎病毒非结构蛋白3AB的原核表达及其单克隆抗体的研制

摘要　目的　利用原核表达系统表达猪脑心肌炎病毒 (EMCV) 非结构蛋白3AB,并通过杂交瘤细胞技术制备其单克隆抗体,为相关研究工作奠定基础。方法　利用大肠杆菌系统表达具有良好抗原性的重组3AB蛋白,经包涵体纯化后免疫BALB/ c 小鼠, 取其脾细胞与小鼠骨髓瘤细胞融合, 间接ELISA筛选阳性的杂交瘤细胞, 并结合免疫荧光(IFA)和Weatern Blot对抗体的特异性进行鉴定。 结果　经间接ELISA 筛选阳性的杂交瘤细胞, 获得1株能稳定分泌抗3AB蛋白抗体的杂交瘤细胞株,将其命名为2D12,其亚类测定为IgG1 /κ。Western Blot和间接免疫荧光试验证明该单抗能特异性识别3AB蛋白。结论　成功获得了针对EMCV-3AB 的特异性单抗,为进一步研究猪脑心肌炎病毒非结构蛋白3AB的结构与功能及临床诊断试剂的研发奠定必要的物质基础。     

Curcuminoids as inhibitors of thioredoxin reductase: A receptor based pharmacophore study with distance mapping of the active site

Curcumin is the yellow pigment of turmeric that interacts irreversibly forming an adduct with thioredoxin reductase (TrxR), an enzyme responsible for redox control of cell and defence against oxidative stress. Docking at both the active sites of TrxR was performed to compare the potency of three naturally occurring curcuminoids, namely curcumin, demethoxy curcumin and bis-demethoxy curcumin. Results show that active sites of TrxR occur at the junction of E and F chains. Volume and area of both cavities is predicted. It has been concluded by distance mapping of the most active conformations that Se atom of catalytic residue SeCYS498, is at a distance of 3.56 from C13 of demethoxy curcumin at the E chain active site, whereas C13 carbon atom forms adduct with Se atom of SeCys 498. We report that at least one methoxy group in curcuminoids is necessary for interation with catalytic residues of thioredoxin. Pharmacophore of both active sites of the TrxR receptor for curcumin and demethoxy curcumin molecules has been drawn and proposed for design and synthesis of most probable potent antiproliferative synthetic drugs.     

A Unique Protease Cleavage Site Predicted in the Spike Protein of the Novel Pneumonia Coronavirus (2019-nCoV) Potentially Related to Viral Transmissibility

正Dear Editor,In December 2019, a novel human coronavirus caused an epidemic of severe pneumonia(Coronavirus Disease 2019,COVID-19) in Wuhan, Hubei, China(Wu et al. 2020; Zhu et al. 2020). So far, this virus has spread to all areas of China and even to other countries. The epidemic has caused 67,102 confirmed infections with 1526 fatal cases     

Comparative morphology of the carpel in the Liliaceae: Hewardieae, Petrosavieae, and Tricyrteae

The young pistils in the melanthioid tribes, Hewardieae, Petrosavieae and Tricyrteae, are uniformly tricarpellate and syncarpous. They lack raphide idioblasts. All are multiovulate, with bitegmic ovules. The Petrosavieae are marked by the presence of septal glands and incomplete syncarpy. Tepals and stamens adhere to the ovary in the Hewardieae and the Petrosavieae but not in the Tricyrteae. Two vascular bundles occur in the stamens of the Hewartlieae and Tricyrtis latifolia. Ventral bundles in the upper part of the ovary of the Hewardieae are continuous with compound septal bundles and placental bundles in the lower part. Putative ventral bundles occur in the alternate position in the Tricyrteae and putative placental bundles in the opposite. position in the Petrosavieae. The dichtomously branched stigma in each carpel of the Tricyrteae is supplied by a bifurcated dorsal bundle.     

Entwicklungsgeschichte und Ultrastruktur von Pollenkitt und Exine bei nahe verwandten entomophilen und anemophilen Angiospermensippen derAlismataceae,Liliaceae, Juncaceae,Cyperaceae, Poaceae undAraceae

Some closely related members of the monocotyledonous familiesAlismataceae, Liliaceae, Juncaceae, Cyperaceae, Poaceae andAraceae with variable modes of pollination (insect- and wind-pollination) were studied in relation to the ultrastructure of pollenkitt and exine (amount, consistency and distribution of pollenkitt on the surface of pollen grains). The character syndromes of pollen cementing in entomophilous, anemophilous and intermediate (ambophilous or amphiphilous) monocotyledons are the same in principal as in dicotyledons. Comparing present with former results one can summarize: 1) The pollenkitt is always produced in the same manner by the anther tapetum in all angiosperm sub-classes. 2) The variable stickiness of entomophilous and anemophilous pollen always depends on the particular distribution and consistency of the pollenkitt, but not its amount on the pollen surface. 3) The mostly dry and powdery pollen of anemophilous plants always contains a variable amount of inactive pollenkitt in its exine cavities. 4) A step-by step change of the pollen cementing syndrome can be observed from entomophily towards anemophily. 5) From the omnipresence of pollenkitt in all wind-pollinated angiosperms studied one can conclude that the ancestors of anemophilous angiosperms probably have been zoophilous (i.e. entomophilous) throughout.

     

Identification and Characterization of the First Equine Parainfluenza Virus 5

正Dear Editor,Parainfluenza virus 5 (PIV5), known as canine parainfluenza virus in the veterinary field, is a negative-sense,nonsegmented, single-stranded RNA virus belonging to the Paramyxoviridae family (Chen 2018). The virus was first reported in primary monkey kidney cells in 1954 (Hsiung1972), then it has been frequently discovered in various     

Pathogenic Characterization and Full Length Genome Sequence of a Reassortant Infectious Bursal Disease Virus Newly Isolated in Pakistan

<正>Dear Editor,Infectious bursal disease (IBD) is one of the most important diseases of the poultry. The IBD virus (IBDV), a nonenveloped virus belonging to the Birnaviridae family with a genome consisting of two segments of double-stranded RNA (segments A and B), targets B lymphocytes of bursa of Fabricious leading to immunosuppression. In Pakistan,poultry farming is the second biggest industry and IBD is the second biggest disease threating the poultry sector.However, there is limited genome information of IBDV