NDV融合蛋白裂解位点基因的重组昆虫杆状病毒表达载体的构建…

将新城疫病毒（ＮＤＶ）Ｆ４６Ｅ９株和ＬａＳｏｔａＥ４株的融合蛋白裂解位点（Ｆｃ）基因从本实验室构建的重组质粒ｐＵＣＦ４６Ｆｃ和ｐＵＣＬａＦｃ中用ＥｃｏＲＩ和ＳａｌＩ切出。将这２个毒株的Ｆｃ基因定向克隆入昆杆状病毒表达载体ｐＳＸＩＶＶＩＸ３的ＥｃｏＲＩ和ＳａｌＩ位点之间，获得２个毒株的Ｆｃ基因克隆ｐＸ３Ｆ４６Ｆｃ和ｐＸ３ＬａＦｃ。重组质粒用ＥｃｏＲＩ／ＳａｌＩ，ＰｓｔＩ酶切法，ＰＣＲ和核酸探针法进行     

新城疫病毒融合蛋白裂解位点基因的分离克隆及在原核细胞中的…

用ＳＰＦ鸡胚繁殖新城疫病毒（ＮＤＶ）Ｆ４６Ｅ９株（强毒）、ＬａＳｏｔａＥ４株（弱毒）、对病毒进行纯一提ＲＮＡ。用１对均为２７个碱基的引物进行ＲＴ－ＰＣＲ，扩增出了２个毒株的融合蛋白裂解位点（Ｆｃ）基因。将Ｆｃ基因定向克隆人ｐＵＣＬａＦｃ，用ＥｃｏＲＩ／Ｓａｌ Ｉ双酶切法、ＰｓｔＩ单酶切法、ＰＣＲ法和核酸探针法对其进行了鉴定。将鉴定好的ＬａＳｏｔａＥ４Ｆｃ基因定向导入表达载体质粒ｐＢＶ２２１，ａｑｔ     

新城疫病毒融合蛋白裂解位点基因的分离克隆及在原核细胞中的表达

用ＳＰＦ鸡胚繁殖新城疫病毒（ＮＤＶ）Ｆ４６Ｅ９株（强毒）、ＬａＳｏｔａＥ４株（弱毒），对病毒进行纯化，抽提ＲＮＡ。用１对均为２７个碱基的引物进行ＲＴ－ＰＣＲ，扩增出了２个毒株的融合蛋白裂解位点（Ｆｃ）基因。将Ｆｃ基因定向克隆入ｐＵＣ１８的ＥｃｏＲＩ和ＳａｌⅠ位点之间，获得２个毒株Ｆｃ基因克隆ｐＵＣＦ４６Ｆｃ和ｐＵＣＬａＦｃ，用ＥｃｏＲＩ／ＳａｌⅠ双酶切法、ＰｓｔⅠ单酶切法、ＰＣＲ法和核酸探针法对其进行了鉴定。将鉴定好的ＬａＳｏｔａＥ４Ｆｃ基因定向导入表达载体质粒ｐＢＶ２２１，获得重组子ｐＢＶＬａＦｃ。ＰＣＲ和内切酶酶切法鉴定表明，Ｆｃ插入的位置和方向都正确无误。用Ｅ．ｃｏｌｉＤＨ５α通过热诱导法进行了表达。用ＳＤＳ－ＰＡＧＥ和Ｗｅｓｔｅｒｎ－ｂｌｏｔ法检测了表达产物。结果表明，有１条能够与ＮＤＶ多抗反应的特异条带，分子量约１５７００，与预期大小一致，说明是Ｆｃ基因的表达产物     

NDV融合蛋白裂解位点基因的重组昆虫杆状病毒表达载体的构建与鉴定

将新城疫病毒（ＮＤＶ）Ｆ４６Ｅ９株和ＬａＳｏｔａＥ４株的融合蛋白裂解位点（Ｆｃ）基因从本实验室构建的重组质粒ｐＵＣＦ４６Ｆｃ和ｐＵＣＬａＦｃ中用ＥｃｏＲＩ和ＳａｌⅠ切出。将这２个毒株的Ｆｃ基因定向克隆入昆虫杆状病毒表达载体ｐＳＸＩＶＶＩ＋Ｘ３的ＥｃｏＲＩ和ＳａｌⅠ位点之间，获得２个毒株的Ｆｃ基因克隆ｐＸ３Ｆ４６Ｆｃ和ｐＸ３ＬａＦｃ。重组质粒用ＥｃｏＲＩ／ＳａｌⅠ、ＰｓｔⅠ酶切法、ＰＣＲ和核酸探针法进行了鉴定，证明插入的基因来自ｐＵＣＦ４６Ｆｃ和ｐＵ－ＣＬａＦｃ，插入的位置和方向都正确。这２个载体的构建为Ｆｃ基因在昆虫细胞系统的表达创造了条件。     

用大片吸虫（Fasciola gigantica，Fg）成虫的28－kDa半胱肽水解酶进行反刍动物体内片吸虫病的免疫诊断（摘要）

用大片吸虫（Ｆａｓｃｉｏｌａｇｉｇａｎｔｉｃａ，Ｆｇ）成虫的２８－ｋＤａ半胱肽水解酶进行反刍动物体内片吸虫病的免疫诊断（摘要）Ｆａｇｂｅｍｉ，Ｂ．Ｏ．＆Ｇｕｏｂａｄｉａ，Ｅ．Ｅ．本文介绍一种以Ｆｇ成虫的２８ｋＤａ半胱肽水解酶作为片吸虫的特异性抗原，建...     

新城疫病毒融合蛋白裂解位点基因光敏生物素探针的制备及初步应用

将重组质粒ｐＵＣＬａＦｃ和ｐＵＣＦ４６Ｆｃ用ＥｃｏＲＩ和ＳａｌⅠ酶切,回收新城疫病毒融合蛋白裂解位点（Ｆｃ）基因,将此Ｆｃ片段用光敏生物素标记,制备出Ｆｃ探针。该探针能够与新城疫病毒（ＮＤＶ）的强毒株Ｆ４６Ｅ９、中毒株Ｍ株和弱毒株ＬａＳｏｔａＥ４株杂交,而不与对照的传染性支气管炎病毒（ＩＢＶ）、减蛋综合征（ＥＤＳ－７６）病毒杂交,说明探针是特异的。用ｐＵＣＬａＦｃ的Ｆｃ探针检测了各５份ＮＤＶ强中弱毒株的尿囊液,均为阳性。但强毒株和弱毒株的Ｆｃ探针都能与所用的强、中、弱毒株杂交,说明该Ｆｃ探针尚不能区分强、弱毒株。     

新生仔猪产CNF大肠杆菌的实验感染

为了检测和比较大肠杆菌（Ｅ．ｃｏｌｉ）产生的细胞毒素坏死因子（ＣＮＦ），用１０＾１０Ｅ．ＣｏｌｉＯ３２菌株口服接种２窝仔猪。在２４小时内，接种Ｅ．ｃｏｌｉＯ８８的６头仔猪死亡２头，３头发生腹泻，其他仔猪于接种后１、５、６和８天屠宰，细菌培养表明感染Ｅ．ｃｏｌｉ者，早期整个大肠发生菌血症；呈现的早期肠炎病变，发展为小肠结肠炎；菌血症扩展到肺部；组织学病变为脑、心、肝和肾出现毒血症，呈充血、水肿和渗出     

pCMV—TNFα的构建及其在动物细胞中的表达

以Ｘｂａ Ｉ和Ｅｃｏ ＲＶ双酶消化ｐＢＴ１获得肿瘤坏死因子α（ＴＮＦα）ｃＤＮＡ基因片段，以Ｘｂａ Ｉ和Ｓｍａ Ｉ酶切点定向克隆入质粒载体ｐＣＭＶ４，构建了人ＴＮＦα重组质粒ｐＣＭＶ－ＴＮＦα。采用ＤＮＡ－磷酸钙共沉淀法转染ＣＯＳ７和ＮＩＨ３Ｔ３细胞，收集转染后不同时间的细胞培养上清，检测ＴＮＦα的表达水平和生物学活性。ＥＬＩＳＡ检测表明，两种细胞转染后，其培养上清中均有ＴＮＦα抗原存在，而载体等     

人肿瘤坏死因子α逆转录病毒表达载体的构建

应用ｐＢｌｕｅｓｃｒｉｐｔｌｌｋｓ质粒构建了含人肿瘤坏死因子－α　ｃＤＮＡ的过渡性载体ｐＢＴ１和ｐＢＴ２。用限制性内切酶ＢａｍＨＩ与ＥｃｏＲＶ消化ｐＢＴ１ＤＮＡ，分离出了ＴＮＦ－α　ｃＤＮＡ基因片段，并在其平末端加入了ＢａｍＨＩ接头。进而将带有ＢａｍＨＩ粘性末端的ＴＮＦ－αｃＤＮＡ克隆到了逆转录病毒载体ｐＺＩＰＮｅｏＳＶ（Ｘ）１５′－端长末端重复序列（ＬＴＲ）下游的ＢａｍＨＩ切点上，构建了重组质粒ｐＺＩＰＴＮＦ。该重组质粒经琼脂糖凝胶电泳，限制性内切酶消化和核酸杂交鉴定分析，证明ｐＺＩＰＮｅｏＳＶ（Ｘ）１中插入了ＴＮＦ－α　ｃＤＮＡ，并且方向正确。本研究为应用重组逆转录病毒介导ＴＮＦ－α基因转移与治疗奠定了基础。     

Berrimach病毒免疫奶牛的研究

Ｂｅｒｒｉｍａｃｈ病毒（ＢＥＲＶ）是牛流行热病毒（ＢＥＦＶ）的相关病毒。它对牛仅表现为亚临床感染，在血清学中与ＢＥＦＶ存在交叉反应。以纯化ＢＥＲＶ与Ｑｕｉｌ Ａ佐剂配成免疫制剂接种奶牛后，取得了良好的免疫效果。     

牦牛EPF的原核表达及多克隆抗体制备

本试验旨在制备牦牛早孕因子(early pregnancy factor,EPF)多克隆抗体,为牦牛妊娠早期高效快速诊断技术研究奠定基础.采用RT-PCR方法,从牦牛胎盘和卵巢组织中提取RNA,反转录为模板后进行EPF基因扩增,并将其克隆到改造后的载体pET28-His10-Sumo上,构建pET28-His10-Su...     

奶牛早孕因子重组蛋白的原核表达、纯化及多克隆抗体的制备

本研究旨在表达、纯化奶牛早孕因子重组蛋白及制备多克隆抗体.本试验构建奶牛早孕因子重组蛋白原核表达载体pET32a-EPF,转化至大肠杆菌BL21(DE3)内进行诱导表达,SDS-PAGE切胶纯化的早孕因子重组蛋白免疫BALB/c小鼠制备多克隆抗体,并用Western blotting和ELISA对重组蛋白及抗体进行检测.结果显示,成功表达并纯化了奶牛早孕因子重组蛋白,重组蛋白分子质量约37 ku,表达量约占菌体总蛋白的48.6%,纯化后目的蛋白纯度可达93%,重组蛋白可与所制备的多克隆抗体结合,ELISA测定的抗体效价为1:12 800.结果表明,本研究成功表达并纯化了奶牛早孕因子重组蛋白,为研究奶牛早孕诊断奠定基础.     

孕牛血清中早孕因子的分离纯化

采用DEAE－Sepharose(DEAE-琼脂糖凝胶）、CM－Sepharose(CM-琼脂糖凝胶）等离子交换层析、抗孕牛全血清IgG-Sepharose 4B亲和层析等技术，分离纯化妊娠4－5个月健康孕牛全血清中的早孕因子（EPF），用玫瑰花环抑制实验对各阶段产物EPF活性进行检测。结果表明，经层析过柱后的CM－ⅡA提取物有EPF活性。经SDS－PAGE银染显色证实它含有分子量为21、67、80KD的蛋白，实验结果支持21KD的多肽为主要EPF活性物成分。同时实验表明了亲和层析对进一步纯化EPF是可行的。     

Fertilizing capability of breeding boars by evaluation of the early pregnancy factor in test sows

The fertilizing ability of breeding boars was evaluated on the basis of an early pregnancy factor (EPF) determined in the blood serum of test sows by the method of rosette inhibition. The fertilizing ability was tested in ten boars on an insemination farm: the fertilizing potency of 41 ejaculates was evaluated from the percent conception of 105 test sows. The percent conception of test sows was evaluated from the EPF positive findings in the blood serum of these sows in the average range of 8.02 +/- 1.70 days (the range of 2 to 11 days) after insemination and from the recorded deliveries. The evaluation of the fertilizing of boars on the basis of EPF in test sows revealed in most cases the higher fertilization rate than could be found on the basis of the recorded deliveries of test sows. There was an exception to this trend: one breeding boar with a paradoxical finding of the somewhat higher percentage of deliveries recorder in test sows, in comparison with the fertilization ability according to the results of EPF. Identical results of the two criteria of fertilizing ability were recorder in another boar with a small number of tested ejaculates and test sows. The average fertilization of the whole set of the breeding boars, expressed by the average percent conception of all test sows, reached 86.67% on the basis of the EPF positive findings in 2 to 11 days after insemination, and 67.31% on the basis of recorded deliveries. These differences in fertilization are likely to be related to the share of dams and can be ascribed to embryonic mortality.     

Detection of early pregnancy factor in superovulated mice

Rosette inhibition tests for the detection of early pregnancy factor (EPF) were performed on naturally ovulated and superovulated mice from day 2 of pregnancy up to 4 days after parturition. In both groups of mice, the rosette inhibition titre (RIT) increased on day 2 of pregnancy, and persisted at high levels until day 15. Thereafter, the RITs of both groups of mice decreased to the non-pregnancy range. No significant differences of the mean RITs between these two groups were observed during the high RIT period. These results showed that the superovulatory treatment did not cause any changes or interference in the detection of EPF. In order to investigate the initial time of appearance of EPF in the maternal circulation in relation to the stage of fertilization, measurement of RIT and examination of the fertilization stage were carried out on superovulated mice 1 day after mating. The mean RIT of mice with pronucleus stage ova was significantly (p less than 0.01) higher than that of mice with sperm-penetrated ova. EPF was considered to appear in the maternal peripheral blood at the pronucleus stage.     

A test for early pregnancy in sheep.

The rosette inhibition test has been used to detect an early pregnancy factor (EPF) in the serum of ewes. EPF was shown to be to be present within 72 h of mating and was still detectable after one month of gestation and in some cases after four months' gestation. The detection of EPF could be of value in the diagnosis of pregnancy in the ewe during the first month of gestation.     

The immunological approach to pregnancy diagnosis: a review

The developing embryo/fetus bears antigens which are foreign to the mother and it could be expected that immune rejection of the conceptus would occur. One of the reasons why the fetus is not rejected is because a depression of the maternal immune response takes place during pregnancy. Serum from pregnant animals of several species has been shown to contain a factor, early pregnancy factor (EPF), which is immunosuppressive. EPF has been detected as early as six hours after mating and its detection could aid diagnosis of early pregnancy in all species.     

早孕因子的生物学特性及其在动物繁殖领域中的应用

早孕因子（early pregnancy factor,EPF）最初发现于孕鼠血清,是妊娠哺乳动物血清中存在的一种具有免疫抑制和生长调节作用的妊娠相关蛋白。EPF的氨基酸序列包括102个氨基酸残基,与伴侣蛋白10（chaperonin 10,Cpn10）高度同源,是Cpn10在细胞外发挥的效应,对温度、酸碱度的耐受性较强,无动物及品种特异性。其生物学特性主要体现在抑制免疫和生长调节两方面：①EPF具有抑制母体的免疫反应而使精子、胚胎免受免疫排斥的作用,也是目前最早确认妊娠的生化标志之一;②EPF能促进肿瘤细胞的生长,也能促进烧伤、溃疡等伤口的愈合。由于EPF能增强抗淋巴细胞血清抑制T细胞花环的形成,因此,玫瑰花环抑制试验是检测EPF活性的经典方法。EPF在动物繁殖领域可用于动物的早期、超早期妊娠诊断,妊娠中断的检测,胚胎移植后的成活情况检测,在评价雄性繁殖力和繁殖免疫疾病的治疗等方面有着重要价值。     

早孕因子的研究进展及应用前景

早孕因子(EPF)是一种免疫抑制性的调节因子,目前普遍认为它是热激蛋白家族成员伴侣蛋白10 的同系物,是最早确认妊娠的生化标志之一,可用花环抑制试验做生物学鉴定。EPF的可用于预测早期胚胎发育情况,帮助了解妊娠母体对胚胎的识别,免疫耐受等机制。早孕因子的发现及研究在生殖生物学领域中具有非常重要的意义。     

Primary culture of fibroblasts and cementoblasts of the equine periodontium

Fibroblasts and cementoblasts in the periodontal ligament (PDL) of equine cheek teeth were harvested, and monocultures were obtained by means of a "selective detachment" procedure. Cells were characterized by morphological criteria and by immunostaining for vimentin, FVIII, pan-cytokeratin, smooth muscle actin, and pro-collagen. Cementogenic potential of the cells was determined by immunostaining for osteopontin and by histochemical detection of alkaline phosphatase. Equine periodontal fibroblasts (EPF) were spindle-shaped and polygonal. Equine dental cementoblasts (EDC) grew in cobblestone-like clusters. Both EPF and EDC stained positive for vimentin. Only EPF contained smooth muscle actin, pro-collagen, and alkaline phosphatase. Few EDC stained positive for osteopontin. The phenotypes of EPF and EDC and their specific expression of proteins corresponded to PDL fibroblasts and dental cementoblasts of other species. These results indicate the potential use of EPF and EDC in an adequate in vitro model of equine cementogenesis and equine periodontal remodeling.