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鸭病毒性肿头出血症病毒感染特性及其免疫检测技术的研究
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摘要
1998-2003年四川省、重庆市、贵州省和云南省等养鸭省份发生了一种以鸭头肿胀、眼结膜充血、出血,全身皮肤广泛性出血,肝肿胀呈土黄色,并伴有出血斑点,体温43℃以上,排草绿色稀粪等特征性的急性病毒性传染病。该病目前给养鸭业带来了巨大的经济损失。程安春等通过流行病学调查、临床症状和病理学变化观察、病理组织学检查、病原的分离鉴定、人工感染试验、电镜观察、防治试验,确诊为一种新的鸭病,并命名为“鸭病毒性肿头出血症(Duck viral swollen head hemorrhagic disease, DVSHD)”。国内其他学者也称之为“鸭传染性肿头症”或“鸭肿头败血症”。
     本病与鸭瘟在临床特征和尸检变化上有许多相似之处,鸭病毒性肿头出血症病毒(Duck swollen head hemorrhagic disease virus, DSHDV)是该病的病原。目前有关该病的研究资料报道较少,特别是有关DSHDV感染特性以及特异、敏感、快速的检测方法等更是缺乏深入研究。因此,本文对鸭病毒性肿头出血症病毒的对成年鸭和鸭胚感染特性以及相关的免疫检测技术进行了一系列的研究。
     本研究获得以下系列结果:
     1.鸭病毒性肿头出血症实验感染模型的建立:本实验用鸭病毒性肿头出血症病毒强毒(HY-99株)作为种毒,通过肌注、口服和滴鼻三种方式感染28日龄健康鸭,攻毒后每天观察临床症状和发病鸭及死亡鸭的剖检变化。结果显示,感染鸭出现以体温升高、头颈肿胀、眼结膜充血、出血、排灰白色或草绿色稀粪为主要特征的临床症状和肝脏肿大、出血呈土黄色、免疫器官和消化道严重充血、出血为主要特征剖检变化。结果表明,临床症状和剖检变化与自然感染鸭基本一致,本实验成功构建了鸭病毒性肿头出血症实验感染模型。
     2. DSHDV强毒人工感染鸭组织病理学发展规律研究:本研究对实验感染模型中感染鸭各个组织器官进行了动态组织病理学变化观察。结果表明,实验感染模型中三组鸭出现的组织病理学变化基本一致,但时间存在差异:肌注组鸭于感染后72h内、滴鼻组和口服组144h内组织病理学变化以充血、出血和炎性细胞浸润为主;肌注组鸭于感染72h后、滴鼻组和口服组144h后组织病理学变化以弥漫性出血、大小不等坏死灶或粘膜上皮细胞的坏死为主。免疫器官、消化腺、消化道、呼吸器官、心脏和肾脏等是主要的靶器官。这表明DSHDV是一种泛嗜性病毒,对全身各个组织器官具有严重破坏作用。
     3. DSHDV强毒在人工感染鸭宿主细胞内的形态发生学和超微病理学研究:电镜下,完整DSHDV粒子呈圆形或椭圆形,无囊膜,直径为70nm-85nm。病毒粒子仅出现在感染细胞的胞浆中。电镜下,可观察到病毒粒子于感染4h后吸附于法氏囊靶细胞表面,并通过细胞的内吞作用进入细胞后,在胞浆内脱去双层衣壳,随后在胞浆内复制并合成病毒相关蛋白。这些合成结构蛋白、非结构蛋白及成熟或不成熟的病毒粒子在胞浆内聚集成圆形、椭圆形或不规则形的包涵体结构。感染后24h-72h,病毒核酸在这些基质上组装和成熟形成完整的病毒粒子。感染144h后,成熟病毒通过细胞的崩解而释放到细胞间隙。DSHDV强毒人工感染成年鸭后能够引起宿主细胞明显的超微结构变化(坏死和凋亡)。该病毒的主要靶器官包括法氏囊、胸腺、脾脏、肝脏、消化道和肾脏等器官。病毒侵染靶细胞主要有:淋巴细胞、肝细胞、成纤维细胞、巨噬细胞、上皮性网状细胞、粘膜上皮细胞、肠腺细胞等。
     4. DSHDV强毒致人工感染鸭和鸭胚宿主细胞凋亡的研究:通过TEM法观察发现,DSHDV经尿囊腔感染10日龄鸭胚后尿囊膜上皮细胞、肝细胞、肠道上皮细胞和心肌细胞发生凋亡。凋亡细胞时间分布在感染后24h-96h,同时在部分宿主细胞的胞浆内发现少量病毒粒子。本研究利用HE染色法、TEM法和TUNEL法三种方法均观察到DSHDV感染诱导鸭宿主细胞的凋亡。发生凋亡的器官包括法氏囊、胸腺、脾脏、肾脏、肝脏、心脏、食管、腺胃和肠道。宿主细胞的凋亡指数从感染后2h到72h逐渐增加,72h达到最高值。感染72h后,濒死鸭和死亡鸭宿主细胞死亡以典型坏死为主。DSHDV感染诱导的细胞凋亡在DVSHD的致病机制中起到重要作用。
     5.免疫酶组织化学检测DSHDV抗原方法的建立和应用:本研究以兔抗DSHDVIgG作为一抗、HRP-羊抗兔IgG作为二抗建立并优化了在石蜡切片中检测DSHDV抗原的间接免疫酶SP法,研究证实本方法具有较高的特异性和敏感性。该方法的应用研究揭示,三组鸭感染DSHDV后,肌注组(4h)、滴鼻组(12h)和口服组(24h)依次首先从法氏囊组织中检测阳性信号,随后抗原在多个组织中检出,包括免疫器官、消化腺、消化道、肾脏、心脏、肺脏和气管等。DSHDV侵染的靶细胞主要包括淋巴细胞、巨噬细胞、网状细胞、粘膜上皮细胞、肝细胞、间质细胞、腺泡细胞、肠腺细胞、肾小管上皮细胞、心肌细胞和柱状上皮细胞等。
     6.间接ELISA检测鸭病毒性肿头出血症抗体方法的建立和应用:本研究以浓缩纯化的DSHDV作为包被抗原,建立了检测DSHDV抗体的间接酶联免疫吸附试验(ELISA)。试验最佳反应条件为:抗原最佳稀释度为1:40,高免血清为1:80稀释,最佳反应时间为60min;酶标抗体为1:2000稀释,最佳反应时间为60min;封闭液为1%BSA-PBST,封闭时间为60min;包被抗原最佳工作条件为37℃孵育1h后过夜;底物的最佳反应时间为37℃孵育15min。本实验建立的方法可成功应用于临床样品的检测和鸭免疫后抗体水平的评估。因此,本方法具有良好的特异性、稳定性、可重复性和较高的敏感性,可用于DVSHD抗体的检测。
An acute contagious viral disease in ducks that is characterized by swelling of the head; diarrhea with green dejecta; a hyperaemia and hemorrhagic of eyes conjunctiv; extensive hemorrhagic of skin; yellow and swollen liver with hemorrhagic; the high body temperature above 43℃, wes observed in many districts of Sichuan Province, Chongqing Municipality, Guizhou Province, and Yunnan Province, China, from 1998 to 2003. This disease has result in significant economic losses in the poultry industry as a result of high mortality and morbidity.This new duck disease was designated by Cheng et al as"duck viral swollen head hemorrhagic disease (DVSHD)", which based on epidemiological investigation, clinic signs, pathology changes, histopathological examination, isolation and identification of etiological agent, experimental infection, electron microscope observation and prevention and cure experiment. In addition, DVSHD was also named by "duck infectious swollen head" or "duck swollen head Septicemia".
     Although there is some resemblance in clinic signs and autopsy between duck plague (DP) and DVSHD, remarkable differences are also observed in epidemic features and prevention and cure experiment between them.Duck swollen head hemorrhagic disease virus (DSHDV), which is considered as the causative agent of DVSHD, belongs to the Reoviridae family on the basis of its biological characteristis. The etiological agent of DVSHD was preliminarily determined, however, little information was available so far for the infection characteristics and the fast and effective methods for dectection of DSHDV or DVSHD. Therefore, a serial of experiments about them were carried out in this study.
     The contents were summarized as follows:
     1. Establishment of experimental infection model for DVSHD. In this study, 28-day-old normal ducks were infected with duck viral swollenhead haemorrhagic disease virus (DSHDV) virulent HY-99 strain by the way of intramuscular, oral and intranasal, respectively. After infection, the clinical symptoms and pathological changes of DSHDV-infected ducks were observed everyday. The results showed that, the DSHDV-infected ducks showed typical clinical symptoms, including fever, neck swelling, conjunctival hyperemia and hemorrhagic, and emitting white or grass green sparse muck; Necropsy revealed the typical lesions of DSHDV-infected ducks includes swelling, hemorrhagics, becoming soil-yellow of the liver, and severe hyperemia and hemorrhagic of the immune organs and digestive tract. The results suggested that the clinical symptoms and pathological changes of experimental DSHDV-infected ducks were consistent with natural DSHDV-infected ducks. So, the experimental model of DSHDV infection was successfully constructed in this experiment.
     2. The histopathological studies on ducks experimentally infected with virulent DSHDV. In the basis of the above experimental infection model, study on the intimate histophological changes were performed in this research. The results indicated that ducks can fall to ill through the three routes and displayed similar histopathological changes but the infection time. Wthin 72h postinfection (PI) for intramuscular group,144h PI for intranasal group and oral group, the histopathological changes showed hyperemia and hemorrhagic and inflammatory cell infiltrating, and severe diffuse hemorrhagic, various degrees of degeneration, cytolysis and necrosis after 72h PI for intramuscular group,144h PI for intranasal group and oral group,. The critical organs contain immne organs, digestive gland, digestive tract, organum respiratorium, heart, and kidney and so on. These results indicated that DSHDV is a kind of pantropic virus and can result in severe lesion in every critical organ of duck.
     3. Morphogenesis of virulent DSHDV and ultrastrural pathology of tissues in experimentally infected duck. The results of TEM observation showed that the complete DSHDV particles were round or ellipse, without peplos, with a diameter ranging from 75 nm to 85 nm, and they were presented in the cytoplasm of the infected cells. After the extracellular attachment of DSHDV to the host cell surface 12h PI, virions enter host cells by endocytosis and then DSHDV to uncoat in the cytoplasm.DSHDV replicate within the cytoplasm and synthesize viral proteins, which is formed spherical, ellipse or anomal inclsion., and then assemble within cytoplasmic inclusions from 24 to 72h PI. After 144h PI,.these complete and ripe virons were finally released to the extracellular space via the disruption of the cytoplasmic membrane. DSHDV infection can induce obviously ultrastructural changes, which mainly contain necosis and apoptosis. The target organs include bursa of Fabricius (BF), thymus, spleen, liver, digestive tract and kidney and so on. The target cells refer to lymphocytes, hepatocytes, desmocytes, macrophages, epithelial-reticular cells, mucosa endothelial cells and intestinal gland cells.
     4. Study on host cell apoptosis induced by DSHDV in vivo. After 10-day-old duck e mbryo infected with virulent DSHDV by allantoic cavity, the results observed by TEM showed that DSHDV infection could induce host cell apoptsis,which contain chorioallantois endothelial cells, hepatocytes, intestinal tract endothelial cells and cadiocytes from 24 to 96h post infection(PI). Simultaneously, a few virus particles were observed within the cytoplasm. Virulent DSHDV infection could induce apoptosis in 28-day-old ducks through hematoxylin-eosin (HE) assay, transmission electron microscope (TEM) observation, and terminal deoxynucleotidyl transferase-mediated dUTP nick end-labelling (TUNEL) assay. Apoptotic target organs refer to BF, thymus, spleen, kidney, liver, heart, oesophagus, proventriculus and intestinal tract. Apoptotic index (AI) values increased with time from 2 to 72 h PI, and the highest values were recorded at 72h PI. Further, cell death due to classic necrosis was observed in the dying or deceased ducks after 72h PI. In conclusion, host cell apoptosis can be induced by virulent DSHDV and may play an important role in the pathogenesis of DVSHD.
     5. Development and application of an indirect immunoperoxidase assay for the detection of DSHDV antigen in tissues. An improved indirect immunoperoxidase assay (streptavidin-peroxidase assay, SP) was developed to virulent DSHDV antigens in paraformaldehyde-fixed, paraffin-embedded tissues of ducks, which based on rabbit antiDSHDV IgG as fisrst antibody and HRP labelled sheep anti rabbit IgG as second antibody. This assay in this study was proved to be highly specific and sensitive.The application of SP assay revealed that positive signals were first detected in BF at 4h PI for intramuscular injection group; 12h PI for nasal administration group and 24h PI for oral administration group, respectively. Next, DSHDV antigens were oberseved in more organs, which contains immune organs, digestive gland, digestive tract, kidney, heart, lung and trachea. The target cells refer to lymphocytes, macrophages, reticulocytes, mucosa epithelial-reticular cells, hepatocytes, mesenchymocyte, acinar cells, intestinal gland cells, renal tubular epithelial cells, cadiocytes and cellula columnoepithelialis.
     6. Development and application of an indirect ELISA for the detection of antibodies against DSHDV. An indirect-ELISA for the detection and quantification of IgG antibody against DSHDV in serum was standardized using purified DSHDV as coating antigen. The test conditions were optimized by reagent titration utilizing known positive and negative sera. The best dilution was 1:40 for DSHDV antigen,1:80 for hyperimmune sera, and the best reaction tme for them 60min at 37℃. The best dilution and reaction time were respectively 1:2000 and 60min at 37℃. The best confining liquid and blockade time were respectively 1%BSA-PBST and 60min at 37℃. The best working condition for coating antigens was 4℃overnight after 37℃for 1h. Finally, the best reaction time for substrates was 37℃for 15min. The specificity test, sensitivity test and reproducibility test all proved that indirect ELISA had good specificity, stability, reproducibility and high sensitivity.This assay can be applied in the detection of antibody against DSHDV.
引文
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