Relative quantification of canine CD56 mRNA expression by real-time polymerase chain reaction method in normal tissues and activated lymphocytes

Real-time PCR was optimized for the quantification of canine CD56 mRNA expression. This study was conducted to easily quantify canine CD56 expression and to identify its expression in normal tissues, peripheral blood mononuclear cells and activated lymphocytes in dogs. This assay revealed the highest level of CD56 mRNA expression in the normal canine brain, followed by the lung, kidney and liver. CD56 mRNA expression level in peripheral blood mononuclear cells was considerably lower; among activated lymphocytes in vitro, CD56 mRNA expression was increased.     

Real-time RT-PCR和RT-PCR方法快速检测犬瘟热病毒

由犬瘟热病毒(CDV)引起的犬瘟热(CD),是犬的一种高度接触性、急性传染病[1].CDV感染范围广泛,自然宿主包括犬科动物(犬、狼、豺、狐等),鼬科动物(貂、臭鼬、黄鼠狼等),浣熊科动物(浣熊、小熊猫、大熊猫等),还可感染灵长类动物(如日本猕猴等),甚至有CDV感染人的病例.除病毒分离、病理包涵体检查、血清学检测、核酸探针、原位杂交等方法外,RT-PCR方法是目前检测CDV最常用的方法[1-3].     

犬轮状病毒荧光定量RT—PCR检测方法的建立

目的:建立轮状病毒快速准确的检测方法,为研发诊断试剂盒和疫苗奠定基础。方法:用Primer5软件设计VP7引物,从采集的腹泻犬粪便样品抽提病毒RNA,用反转录聚合酶链式反应(RT-PCR)技术,将RNA反转录为cDNA,并进行PCR扩增,对扩增产物进行非变性聚丙烯酰胺凝胶电泳和测序,与代表株的VP7进行同源性比较。结果:从腹泻病犬粪便样品中抽提到了轮状病毒RNA,反转录后扩增产物为51bp的基因片段,经核苷酸序列分析,其PCR序列与犬轮状病毒VP7基因编码源序列的同源性为86.3%。结论:正确克隆了轮状病毒主要保护性抗VP7基因中抗原表位区,建立了犬轮状病毒实时定量诊断方法,为研制实时定量诊断试剂盒奠定了基础。     

荧光定量PCR检测小鼠卵母细胞中Mad2 mRNA的表达

目的:应用SYBR G reen I染料法建立检测Mad2 mRNA表达的实时荧光定量PCR的方法,并探讨小鼠卵母细胞减数分裂成熟中Mad2 mRNA的表达。方法:采用实时荧光定量PCR的方法,以SYBR G reen I为荧光染料,梯度稀释的重组质粒为模板制作标准曲线,并以此方法分析了小鼠卵母细胞减数分裂成熟过程中Mad2 mRNA表达的动态变化。结果:建立了实时荧光定量检测方法分析小鼠卵母细胞中Mad2 mRNA的表达,该方法灵敏、特异,扩增效率接近100%。进行了标准曲线的制作,以及对目的基因Mad2转录水平的绝对定量。结论:实时荧光定量PCR是检测基因表达水平的理想选择,在小鼠卵母细胞减数分裂成熟过程中Mad2 mRNA表达存在动态变化。     

Glycohistochemical characterization of histologically normal nasal mucosa and enzootic nasal tumor of sheep

Objective-To determine glycohistochemical characteristics of enzootic nasal tumors (ENTs) of sheep, compare results for ENT with those of histologically normal nasal mucosa of sheep, and identify the histologic origin of ENT. Sample-ENT and nasal mucosa samples obtained from cadavers of 5 adult Lacaune sheep with ENT and 5 Lacaune sheep unaffected by ENT, respectively. Procedures-Samples of ENT and nasal mucosa were collected from cadavers of sheep and sectioned. Conventional and lectin histochemical analyses were used to identify glycoconjugates in tissue sections on the basis of their principal chemical groups and principal terminal or internal oligosaccharidic glucidic residues, respectively. Results-ENTs had papillary and tubular portions. Cells in the papillary portion of ENTs had secretion and surface glycoconjugates, which included sulfated glycosaminoglycans and neutral and sialilated glycoproteins. Cells in the tubular portion of ENTs had surface glycoconjugates, which included neutral and sialilated glycoproteins. Both portions of ENTs had C(4)-acetylated sialoderivatives that were not detected in sections of histologically normal nasal mucosa. Conclusions and Clinical Relevance-The papillary portion of ENTs in sheep may originate from respiratory glands and goblet cells. The tubular portion of ENTs in sheep may originate from olfactory glands. Presence of C(4)-acetylated sialoderivatives in cells of ENTs could confer resistance against pathogens to those cells.     

实时荧光定量RT-PCR检测犬乳腺肿瘤血管内皮生长因子(VEGF)基因方法的建立及初步应用

为了准确地分析血管内皮生长因子（Vascular endothelial growth factor,VEGF）在犬乳腺肿瘤形成过程中的作用,试验设计了针对犬VEGF基因的特异性引物,提取乳腺肿瘤组织RNA并扩增出目的片段,将PCR产物克隆到pGEM-T Easy载体,经质粒PCR扩增、酶切和测序鉴定重组质粒,构建标准曲线等,成功建立了乳腺肿瘤VEGF基因实时荧光定量PCR检测方法。运用实时荧光定量PCR检测了40例不同的犬乳腺肿瘤病例、2例正常乳腺组织。结果发现：在犬恶性乳腺肿瘤组织中,VEGF基因表达量明显高于良性乳腺肿瘤和正常乳腺组织（P〈0.001）;在伴有淋巴结转移的犬乳腺癌组织中,VEGF基因表达量明显高于没有发现转移的乳腺癌组织（P〈0.01）,但VEGF基因的表达量与肿瘤的大小和发病动物年龄无关（P〉0.05）。VEGF基因在犬乳腺癌组织中的表达量远高于其在正常乳腺和良性乳腺肿瘤组织中的表达,且与淋巴结是否发生转移相关。因此,VEGF可作为犬乳腺癌转移、复发的预测指标之一。     

The quantitative assessment of normal canine small intestinal mucosa.

Quanitative methods of assessing the architecture of small intestinal mucosa have been applied to biopsy material from normal dogs. Mucosal samples taken from four predetermined sites show that there are significant quantitative differences between the various levels of the small bowel. Animals of one year of age and older show no correlation between age or weight and mucosal dimensions. The significance of these findings, in relation to examination of biopsy material from cases of clinical small intestinal disease, is discussed.     

实时荧光定量RT-PCR方法检测禽流感病毒

根据禽流感病毒(Avian influenza virus,AIV)M基因上的保守序列,合成引物和荧光标记探针,以阳性AIVM基因质粒为标准品做标准曲线,建立了荧光定量逆转录聚合酶链反应(RRT-PCR)检测方法。结果表明,本试验建立的标准曲线循环阈值(Ct值)与模板浓度具有良好的线性关系,相关系数为0.999,灵敏度约为5拷贝/μL,相当于5个AIV颗粒,对新城疫病毒和其他禽病病毒无交叉反应,特异性好、重复性佳,为AIV检测提供了一种特异、敏感、快速的定量检测方法。对500份临床泄殖腔棉拭样品的检测,其结果阳性?阴性数与经典病毒分离方法符合率分别为91.2%?99.4%。在AIV临床样品筛检、流行病学监测等方面显示良好的应用前景。     

RT-PCR检测犬粪便中的冠状病毒

根据犬冠状病毒(caninecoronavirus, CCV) 的S基因序列, 用计算机设计并合成了1对引物P1、P2, 以此引物及以从美国进口的CCV疫苗的反转录产物为模板, 初步建立了检测CCV的RT PCR。将纯化的PCR产物成功地克隆到pGEM T easy载体中, 鉴定、测序并进行同源性分析。结果表明, 与1 71和UCD 1株同源性分别为91 5%和94 3%。该RT PCR能对疫苗中CCV及CCV参考株USCV B1的S基因进行特异性地扩增,长度为575bp, 对犬的其他病毒及CRFK细胞未能扩增出任何片段, 该RT PCR能检测出0 5μLCCV培养液/2g粪便。用建立的RT PCR在上海对50条犬粪便进行检测, 结果表明CCV阳性6例。本研究建立了检测犬粪便中的CCV的RT PCR, 能用于犬冠状病毒流行病学调查。     

Identification of gender-regulated genes in Ancylostoma braziliense by real-time RT-PCR

Ancylostoma braziliense belongs to the family Ancylostomatidae and infects cats and dogs in various parts of the tropical world. It is also a zoonotic parasite causing cutaneous larva migrants in humans. There are very few, either biological or molecular, studies of this species. In this study, differential display was used to identify differentially expressed genes in male and female A. braziliense. Nineteen new sequences were identified and examined by real-time RT-PCR to confirm male-female specificity. Ten were more expressed in males, while two were more expressed in females. Molecules shown to be important in other host-parasite relationships were also found in this study.     

犬瘟热病毒一步法荧光定量PCR检测方法的建立

为建立犬瘟热病毒(CDV)TaqMan实时荧光定量PCR检测方法,根据CDV核衣壳蛋白(NP)基因序列,设计合成2对通用引物和1条通用探针,通过体外转录构建绝对定量标准品RNA。对荧光定量PCR方法的各项条件进行优化,建立CDV荧光定量PCR检测方法,该方法检测灵敏度可达4.02拷贝/μL,比普通RT-PCR方法的灵敏度高出100倍,具有良好的重复性。对犬细小病毒(CPV)、犬腺病毒(CAV-1)、犬冠状病毒(CCV)、犬副流感病毒(CPIV)核酸检测为阴性,具有很好的特异性。研究结果表明,建立的CDV荧光定量PCR方法具有敏感性高、特异性强、重复性好的特点,为犬瘟热的早期诊断提供了重要的技术支撑。     

用荧光定量RT-PCR方法检测猪瘟病毒

为了建立能特异检测不同基因型猪瘟病毒(Classical swine fever virus,CSFV),同时又能区分其他瘟病毒的基因检测方法,本实验针对CSFV基因组5′端非编码区设计并合成了简并引物和TaqMan探针,在优化反应条件的基础上,成功地建立了特异检测CSFV的荧光定量RT-PCR检测方法。再以已知滴度的CSFV石门株血毒总RNA反转录产物建立标准品,该标准品可以用于定量临床样品中的CSFV滴度,所建立的荧光定量PCR方法可以灵敏地检测出10~(-0.82)个TCID_(50)病毒含量。最后用建立的方法对108份临床样品进行检测并同时进行病毒分离,荧光定量PCR方法检测出73份阳性样品且与病毒分离的符合率为100%,而常规RT-PCR只检测出54份阳性样品,表明本荧光定量RT-PCR法在检测猪瘟病料上具有潜在的应用价值。