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1.
传染性囊病病毒诱导细胞凋亡的初步观察 总被引：5，自引：0，他引：5
用１株ＩＢＤＶ强毒株感染易感小鸡，对病鸡法氏囊进行电镜观察及ＤＮＡ电泳分析，直接观察到病鸡法氏囊中Ｂ淋巴细胞凋亡的典型形态学特征和生化变化：染色质凝聚成团，集于核膜旁，胞膜与核膜出现凹陷，细胞拉长变形，最后细胞裂解成由膜包围着的小团，被网状细胞和巨噬细胞吞噬；感染ＩＢＤＶ２４～４８ｈ的法氏囊细胞总ＤＮＡ在电泳谱上呈梯状条带，而从正常的法氏囊提取的总ＤＮＡ在电泳谱上只有１条带。结果表明，ＩＢＤＶ感染小鸡之后，导致了法氏囊中Ｂ淋巴细胞的凋亡。作者据此推断，细胞凋亡是造成Ｂ淋巴细胞数量减少，从而导致小鸡免疫抑制的原因 相似文献
2.
应用组织病理学和电子显微镜技术对以传染性法氏囊病病毒不同毒株人工感染后不同感染时间鸡的法氏囊、肾脏、脾脏进行了检查。结果显示:法氏囊淋巴滤泡髓质首先被破坏,滤泡之间水肿,整个淋巴滤泡前B淋巴细胞崩解、坏死,网状细胞和巨噬细胞增生。72小时后,几乎见不到前B淋巴细胞。168小时法氏囊萎缩,上皮增生。脾脏和肾脏仅出现轻微变化。超微结构变化特征是淋巴样组织坏死,法氏囊组织中的前B淋巴细胞、巨噬细胞和网状细胞内有大量约60nm的病毒颗粒,呈结晶状排列,有的细胞中可见到多个病毒结晶体。 相似文献
3.
取３２０只３０～４０Ｈ龄ＳＰＦ鸡，经滴鼻和点眼接种传染性法氏囊病病毒（ＩＢＤＶ），接种后２４～７２ｈ出现死亡，病死率５１．２５％，死亡鸡剖检变化主要为法氏囊肿胀、出血，甚至呈紫葡萄样，脾脏肿大、出血，骨骼肌出血，腺胃肌胃交界处出血。病理组织学变化，呈现以法氏囊淋巴滤泡内髓质淋巴细胞坏死为主的特征性病变，并可在巨噬细胞浆内发现病毒包涵体。电镜观察，在法氏囊内淋巴细胞、异染性细胞、巨噬细胞浆内，见大量晶格状排列的病毒粒子和包涵体，表明ＩＢＤＶ首先损害法氏囊淋巴滤泡髓质内未成熟的Ｂ淋巴细胞，病毒在淋巴细胞内以包涵体方式增殖。 相似文献
4.
雏鸡感染IBDV后法氏囊显微和超微结构的观察 总被引：1，自引：0，他引：1
运用光镜、电镜技术，观察了雏鸡实验感染传染性法氏囊病病毒（ＩＢＤＶ）后，其法氏囊显微和超微结构的动态变化。光镜观察表明，在感染早期，淋巴滤泡髓质部的淋巴细胞发生坏死，间质轻度水肿。感染后４ｄ，淋巴滤泡皮质内的毛细血管呈一典型的出血带环绕髓质，髓质部的淋巴细胞多已坏死、崩解。继之，整个淋巴滤泡呈网络状或囊状空泡。感染６ｄ以后，固有膜内的网状细胞和毛细血管大量增生，新的淋巴滤泡形成。电镜观察证明，在感染早期，淋巴细胞质内的内质网与核膜扩张，线粒体嵴紊乱或空泡化。继之，淋巴细胞核液化，细胞坏死、崩解。巨噬细胞和多核巨细胞大量出现，其胞浆内含有大量吞噬体和吞噬泡。 相似文献
5.
鸡传染性法氏囊病超强毒感染后SPF鸡免疫器官病理学观察 总被引：8，自引：2，他引：6
IBDV超强毒株LX株接种2周龄SPF雏鸡后，其致病性不同于经典强毒株CJ801株，它主要引起接种鸡全身性炎症反应，法氏囊、脾脏、盲肠扁桃体等免疫器官中大量异嗜性白细胞、巨噬细胞浸润，淋巴细胞严重坏死崩解，胸腺皮质严重萎缩、坏死，骨髓中造血细胞减少、巨噬细胞和脂肪细胞增生。在接种后14d法氏囊淋巴滤泡严重萎缩、淋巴细胞排空形成囊腺样结构，未见恢复正常，其它免疫器官形态基本恢复正常。电镜观察，接种后2和4d可见胸腺淋巴细胞胞浆浓集、染色质周边化形成新月形，表现细胞凋亡特征；在法氏囊坏死淋巴细胞胞浆中可见60nm大小呈晶格排列或散在的病毒粒子。研究初步探明了鸡传染性法氏囊病病毒超强毒的致病机理。 相似文献
6.
本试验运用传染性法氏囊病病毒变异 Ｅ 株，通过泄殖腔和鼻腔接种 １，８，１５，３０ 日龄雏鸡，通过尿囊腔接种８， １３，１８ 日龄鸡胚，全面而系统地观察了接毒后不同时间法氏囊的组织形态学变化，探讨了传染性法氏囊病病毒对胚胎发育时期和雏鸡发育时期法氏囊生长发育的影响。结果表明， Ｉ Ｂ Ｄ Ｖ 感染后１２～４８ ｈ，雏鸡法氏囊粘膜上皮细胞肿胀，坏死脱落，淋巴滤泡髓质部及皮质部淋巴细胞不同程度变性、坏死、排空，形成腺管样结构或囊状空泡： 接毒后７２～１４４ ｈ，法氏囊淋巴滤泡淋巴细胞坏死排空，淋巴滤泡萎缩，网状结缔组织大量增生，而胚胎发育时期，法氏囊粘膜上皮肿胀变性，法氏囊淋巴滤泡形成延迟或不完整，淋巴滤泡内淋巴细胞缺乏或空虚，说明传染性法氏囊病病毒变异 Ｅ 株对法氏囊造成严重的组织学危害，从而导致法氏囊生长发育阻滞，组织学形态和结构严重受损。 相似文献
7.
取３２０只３０～４０日龄ＳＰＦ鸡，经滴鼻和点眼接种传染性法氏囊病病毒（ＩＢＤＶ），接种后２４～７２ｈ出现死亡，病死率５１．２５％，死亡鸡剖检变化主要为法氏囊肿胀，甚至呈紫葡萄样，脾脏肿大、出血，骨骼肌出血，腺胃肌胃交界处出血，病理组织学变化，呈现以法氏囊淋巴滤泡内髓质淋巴细胞坏死为主的特征性病变，并可在巨噬细胞浆内发现病毒包函体，电镜观察，在法氏囊内淋巴细胞，异染性细胞，巨噬细胞浆内，见大量格状排 相似文献
8.
运用ＢＡ免疫组化技术与ＨＥ染色进行对比研究，探讨了实验性攻击马立克氏病病毒（ＭＤＶ）后鸡体内病毒抗原分布与病变特点之间的关系。结果表明，ＭＤＶ能引起胸腺髓质区、脾动脉周围淋巴鞘、法氏囊生发中心淋巴细胞坏死、网状细胞增生，开逐渐在全身各部位产生多发性淋巴样细胞增生灶。病毒抗原阳性反应与网状细胞增生明显相关。ＭＤＶ抗原阳性细胞主要包括网状细胞，浓缩碎裂的淋巴细胞及浸润的淋巴样细胞，这些细胞浆和胞核均哇 相似文献
9.
本试验利用透射电镜连续观察了传染性法氏囊病病毒变异 Ｅ 株人工感染雏鸡后不同时期法氏囊细胞的超微结构变化,并对法氏囊内 Ｓ Ｉｇ Ｍ , Ｓ Ｉｇ Ｇ, Ｓ Ｉｇ Ａ 三种抗体生成阳性细胞数量和血液中 Ｉｇ Ｍ , Ｉｇ Ａ, Ｉｇ Ｇ 抗体水平进行了检测。观察结果表明, Ｉ Ｂ Ｄ Ｖ 感染后法氏囊淋巴细胞出现了严重变性、坏死,表现为核染色质浓缩、碎裂、溶解,线粒体溶解呈空泡样结构,其 他细胞器坏死溶解,在法氏囊淋巴细胞、巨噬细胞、网状上皮细胞等细胞的胞浆中可见不同类型和排列方式的病毒粒子。 Ｉ Ｂ Ｄ Ｖ 感染后法氏囊内抗体阳性细胞数量和血清中抗体水平均呈现不同程度的下降,揭示雏鸡机体体液免疫功能严重抑制。 相似文献
10.
用鸡淋巴细胞性白血病病毒ＲＡＶ－１株接种３５只１日龄伊莎鸡雏，于接毒后不同批次扑杀，采取法氏囊做组织学、免疫细胞化学、透射电镜观察。结果：接毒后１个月，法氏囊滤泡髓质淋巴细胞开始转化，接毒后２～５个月更明显，在法氏囊滤泡髓质区形成淋巴细胞克隆增殖灶。接毒后６个月，法氏囊萎缩。ＢＡ法染色表明法氏囊一直存有病毒和群特异性抗原，以接毒后３～４个月含量最高。电镜观察，在接毒后１～４个月的实验鸡法氏囊滤泡髓质淋巴细胞、巨噬细胞和网状细胞中观察到ＬＬ病毒粒子。组织学、免疫细胞化学和电镜观察都表明法氏囊是该病毒的主要靶器官，法氏囊决定鸡淋巴细胞性白血病的发生发展。 相似文献
11.
鸡传染性法氏囊病的病理学研究 总被引：3，自引：0，他引：3
人工接种２８日龄非免疫鸡传染性法氏囊病病毒（ＩＢＤＶ）后,对感染鸡的法氏囊、胸腺、脾、盲肠扁桃体、哈德氏腺、肝、肾进行病理组织学检查。感染后４８ｈ,法氏囊淋巴组织最早出现坏死且长久存在。其他淋巴器官的病变出现较迟,程度轻微且恢复较快。ＩＢＤＶ单抗免疫荧光检测,法氏囊及其他淋巴器官中均检测到病毒,接种后１２ｈ法氏囊中即检出病毒,持续时间也最长（攻毒后１２ｄ）,其次是盲肠扁桃体（攻毒后８ｄ）。攻毒１３ｄ以后,上述器官均未检测到病毒。法氏囊粘膜上皮的扫描电镜观察,攻毒后２ｄ,上皮细胞肿胀,微绒毛减少或消失。攻毒后３ｄ,局部上皮细胞坏死、脱落,并向整个粘膜层扩展,攻毒后１０ｄ,上皮层基本修复。 相似文献
12.
Electron microscopy and immunocytochemistry were used to study the development of lymphoid leukosis virus infection in the bursa of Fabricius of experimentally infected chicken embryos and chickens. In embryos infected at 7 days of incubation and killed 10 days later, virus particles and group-specific viral antigen were confined mainly to the connective tissue of the lamina propria of the bursal mucosal folds; a few developing follicles had discrete virions and group-specific antigen between cells. In chickens infected at 1 day of age, infection (as determined by use of electron microscopy and immunocytochemistry) was maximal in 1- to 4-month-old birds, and the greatest concentration of virus and group-specific viral antigen was in the medulla of the follicles. Although lymphoid leukosis virus was released from lymphocytes, epithelial cells, and macrophages, virus replication in the medullary macrophages was more active than that in the other cells. Normal medullary macrophages had cell membrane vesicles (50 to 80 nm in diameter) that covered part of all of the cell membrane surface. In infected chickens, virus particles frequently developed within these vesicles. Comparable vesicles were not found on cortical macrophages. Results of the present study indicated that the medullary macrophage was the principal host cell for replication of lymphoid leukosis virus in the bursa of Fabricius of the chicken. 相似文献
13.
OBJECTIVE: To examine effects of virus exposure on embryonic lymphoid organ structure, apoptosis, and lymphoid cell subpopulations. ANIMALS: Eggs of specific pathogen free (SPF) White Leghorn chickens at embryonation day (ED) 17. PROCEDURES: Eggs were inoculated with 2,000 plaque-forming units (PFU) of serotype 1 herpesvirus (Marek's disease virus [MDV 1]), 2,000 PFU of herpesvirus of turkeys (MDV 3), or 1,000 embryo infectious doses (EID50) of infectious bursal disease virus (IBDV). On post-inoculation days (PID) 3 and 5, lymphoid organ to body weight ratios were determined, and bursa of Fabricius, thymus, and spleen were evaluated for lesions and apoptosis. Proportions of lymphoid cell subpopulations of PID-3 chicken embryos and 7- to 10-day-old chicks were quantitated by flow cytometry. RESULTS: Lymphoid organ weights were similar in virus-free, MDV1, and IBDV groups. Embryos inoculated with 2,000 PFU MDV 3/egg had lower bursal weights than virus-free controls. In a repeated trial, MDV 3 (1,000 PFU to 4,000 PFU) did not reduce bursal weights among groups. Histologic changes were seen in bursae after MDV 1 and IBDV inoculation. Apoptosis was greater in bursae of MDV 1-infected embryos than controls. Lymphoid cell subpopulations were similar among all groups with the exception of CD8+ and IgM+ cells in spleens of IBDV-infected 10-day-old chicks. CONCLUSIONS AND CLINICAL RELEVANCE: Infection with pathogenic strains of MDV 1 and IBDV did not alter lymphocyte subpopulations in embryos or cause complete destruction of lymphoid organs. Changes in lymphoid cell subpopulations exposed as embryos to IBDV were seen only after hatching. 相似文献
14.
15.
The effect of a systemic disease on the dynamics of iron, zinc, and copper in chickens fed ad libitum was examined by infecting 10-day-old specific pathogen-free chickens with infectious bursal disease virus (IBDV). Liver, bursa of Fabricius, pancreas, spleen, and serum were sampled in 10 controls and 10 challenged chickens at 3-day intervals postinfection (PI) for 15 days. The samples were analyzed using atomic absorption spectroscopy. Serum levels were similar to that reported in the literature. Concentrations of iron and zinc did not change significantly in the pancreas, but there was an increase in copper in infected pancreatic tissue on days 9 and 15 PI. Iron concentration in the spleen showed a significant increase on days 6, 9, and 15 PI, whereas zinc was only significantly increased on day 15 PI. There was no significant change in copper concentrations in the spleens of infected chickens vs. controls. This finding is in line with previously reported data. The results showed that the liver was not a major tissue where iron and zinc were sequestered, as previous data have shown in mammals. Instead, the bursa of Fabricius had significantly increased levels of both iron and zinc in infected tissue vs. control tissue from 9 days PI on. Furthermore, the bursa had increased levels of copper in the latter portion of the study. These findings suggest that the bursa of Fabricius rather than the liver is the major organ for metallic ion sequestering during IBDV infection. 相似文献
16.
Electron microscopy of bursa of Fabricius of chicks infected with a field strain of infectious bursal disease virus 总被引：2，自引：0，他引：2
Chicks were infected in the bursa with a field strain of infectious bursal disease virus. Inter- and intracellular edema, condensation and margination of nuclear chromatin, increased number of lysosomes in macrophages, and lymphocytolytic changes appeared earliest by 8 hours post infection. Inclusions containing spheroid to hexagonal virus particles were seen in the cytoplasm of the macrophages. Multiplying virus particles in crystalline arrays arranged either in single or in multiple clusters were seen in the cytoplasm of macrophages, lymphocytes and light stained reticular epithelial cells. 相似文献
17.
法氏囊在鸡淋巴细胞性白血病发生发展中的作用 总被引：3，自引：1，他引：2
用鸡淋巴细胞性白血病病毒ＲＡＶ－１株接种３５只１日龄伊莎鸡雏，于接毒后不同批次扑杀，采取法氏囊做组织学、免疫细胞化学、透射电镜观察。结果：接毒后１个月，法氏囊滤泡髓质淋巴细胞开始转化，接毒后２～５个月更明显，在法氏囊滤泡髓质区形成成淋巴细胞克隆增殖灶。接毒后６个月，法氏囊萎缩。生物素－亲和素（ＢＡ）法染色表明法氏囊一直存有病毒和群特异性抗原，以接毒后３～４个月含量最高。电镜观察，在接毒后１～４个月的实验鸡法氏囊滤泡髓质淋巴细胞、巨噬细胞和网状细胞中观察到淋巴细胞性白血病（ＬＬ）病毒粒子。组织学、免疫细胞化学和电镜观察都表明法氏囊是该病的主要靶器官之一，法氏囊在鸡淋巴细胞性白血病的发生发展中起一定的作用 相似文献
18.
S J Proctor 《American journal of veterinary research》1976,37(4):427-431
White Pekin ducks were inoculated orally with duck plague virus and killed at 24-hour intervals after inoculation. Spleen, thymus, and bursa of Fabricius were collected and examined by light, fluorescent, and electron microscopy. Necrosis of lymphocytes occurred in the bursa of Fabricius, thymus, splenic periarteriolar lymphoid sheath (T lymphocytes), and splenic germinal centers (B lymphocytes). Viral nucleocapsids were present in the karyoplasm of lymphocytes, but these cells necrotized before virions were formed. Periarteriolar reticular sheath cells and sinusoidal lining cells in the spleen, epithelial cells in Hassall's corpuscle of the thymus, epithelial cells between the cortex and medulla of the follicles in the bursa of Fabricius, and macrophages in all 3 tissues contained nucleocapsids in the nuclei and virions in cytoplasmic vacuoles before necrosis occurred. 相似文献