猪瘟病毒中等致病力毒株在体内的动态分布

doi:10.3864/j.issn.0578-1752.2018.21.013

摘要/Abstract

摘要：

【目的】目前我国猪瘟的感染类型主要是亚急性感染及慢性感染,研究猪瘟亚急性感染后体内病毒RNA和蛋白的分布情况,有助于阐述亚急性病程猪瘟病毒的复制分布规律,为猪瘟的早期诊断和预防奠定重要基础。【方法】成功以中等致病力毒株（HeBHH1/95）构建了亚急性猪瘟感染动物模型,分别采集感染后第1、3、6、10、13、20、24、28 天感染猪的十二指肠、脾脏、肾脏、肺脏、胰、回盲瓣6种组织器官并进行连续切片。应用建立的猪瘟病毒可视化原位杂交技术（ViewRNA ISH ）研究感染组织中病毒RNA动态分布,同时采用免疫组化（IHC）、H.E染色分别检测感染组织中蛋白的分布情况及其组织损伤位置,从而在病毒核酸和蛋白水平系统性的观察病毒的分布情况。【结果】采用Mittelholzer方法进行临床计分发现感染后6—10 d感染猪猪瘟临床症状记分迅速增加,11—26 d感染猪临床记分一直维持在15分左右,直到28 d临床记分达到最高值20分。感染后8—10 d感染猪体温呈上升趋势;13—24 d感染猪体温呈现稽留热,持续在40℃左右;此后体温开始回落,至濒死前体温回落至39.5℃左右。应用CSFV ViewRNA ISH感染后第1 天在十二指肠绒毛杯状细胞及胰腺的腺泡、回盲瓣的固有层、肾脏的肾小管等这些具有分泌功能的结构组织周围检测到病毒RNA阳性信号;感染后第3天在肺脏的细支气管和脾脏的椭圆体周围检测到病毒RNA阳性信号;第13天阳性信号富集显著,至第28天病毒RNA广泛分布在脾脏动脉周围淋巴鞘及胰腺腺泡和肾小管等组织周围。采用IHC和H.E染色法在连续切片的相似视野下验证ViewRNA ISH检测结果,发现感染后第1天十二指肠、胰腺、肾脏亦可检测到病毒蛋白阳性信号和相应组织的病理变化,但回盲瓣在第3天检测到病毒蛋白阳性信号和组织的病理变化,在之后的病程中各组织中病毒RNA、蛋白定位情况趋于一致,第28天病毒蛋白集中在脾脏动脉周围淋巴鞘及胰腺腺泡等周围。【结论】采用ViewRNA ISH方法在回盲瓣中可以早于IHC发现猪瘟病毒,各个组织中ViewRNA ISH检测到病毒部位与IHC检测到病毒部位及H.E检测到的组织损伤部位相似,表明ViewRNA ISH具有良好的灵敏性可以应用于检测感染早期病毒在组织中的分布。前期病毒RNA通常在胰腺腺泡、肾小管及脾脏的椭圆体周围复制,在感染中期病毒在各组织结构中大量增殖,感染后期病毒不仅在淋巴细胞周围富集,还易在具有分泌功能的部位复制增殖。

关键词: 猪瘟病毒, 中等致病力, RNA, 可视化原位杂交, 分布

Abstract:

【Objective】At present, the infection type of classical swine fever in China is mainly subacute or chronic infection. The aim of this study was to investigate the differences and distribution of RNA and protein expressions in pigs infected with the intermediate virulent strain of classical swine fever virus. The results could help to elucidate the replication and distribution of the subacute disease virus and to provide technical support for the early diagnosis and prevention of classical swine fever.【Method】Using the medium virulence strain (HEBHH1/95), we successfully established a subacute CSF infection animal model. Duodenum, spleen, kidney, lung, pancreas and ileocecal samples were collected from pigs for viewing in situ hybridization (ISH), immunohistochemistry (IHC) and hematoxylin-eosin staining (HE) at 1 day post infection (dpi), 3 dpi, 6 dpi, 10 dpi, 13 dpi, 20 dpi, 24 dpi and 28 dpi. The ViewRNA ISH was used to study the dynamic distribution of viral RNA in infected tissues. Immunohistochemistry (IHC) and HE staining were used to detect the distribution of viral proteins in infected tissues and their contribution to tissue damage.【Result】The clinical score increased rapidly from 6 dpi to 10 dpi, then from 11 dpi to 26 dpi the score remained at approximately 15, until at 28 dpi clinical score peaked at 20 points. The body temperature showed an upward trend from 8 dpi to 10 dpi, and then livestock suffered from continuous fever which persisted at about 40℃ from 13 dpi to 24 dpi, thereafter, the body temperature began to fall back to about 39.5℃ before the animal died. Viral RNA were detected in duodenum, pancreas, ileocecal valve and kidney at 1 dpi and in the lungs of the bronchioles, spleen oval body at 3 dpi; Viral RNAs widely distributed in each tissue at 28 dpi, and were mainly observed in the spleen artery around the lymphatic sheath, pancreatic acinar, renal tubular with secretion function. The IHC and HE staining were used to verify the results of ViewRNA ISH in similar fields of vision. The positive signals of viral proteins and the corresponding histopathological changes of duodenum, pancreas and kidney were also detected at 1 dpi, but the viral protein and tissue pathological changes were detected in the ileocecal valve, spleen and lung at 3 dpi. Viral RNA and protein localization tended to be the same in each tissue after 3 dpi.【Conclusion】All the results showed that CSFV had an increasing virus load from 1 dpi to 28 dpi detected by ViewRNA ISH, which was in consistent with the result of IHC. Moreover, CSFV was firstly tropism to secretory cells such as pancreatic acinar, renal tubular and spleen artery at the beginning of infection (1 dpi-3 dpi), and then showed pantropically infectious to all the tissues during the infection period (6 dpi-13 dpi), and during the final stage CSFV was accumulated both around lymphocytes and secretory cells (20 dpi-28 dpi).

Key words: CSFV, medium virulent, RNA, ViewRNA ISH, distribution

孙骏翔,张乾义,徐和敏,王团结,徐璐,邹兴启,朱元源,李翠,夏应菊,徐嫄,陈锴,张玉杰,赵启祖,王琴. 猪瘟病毒中等致病力毒株在体内的动态分布[J]. 中国农业科学, 2018, 51(21): 4146-4156.

JunXiang SUN,QianYi ZHANG,HeMin XU,TuanJie WANG,Lu XU,XingQi ZOU,YuanYuan ZHU,Cui LI,YingJu XIA,Yuan XU,Kai CHEN,YuJie ZHANG,QiZu ZHAO,Qin WANG. Dynamic Distribution of Classical Swine Fever Virus in vivo After Infection by Intermediate Virulent Strains[J]. Scientia Agricultura Sinica, 2018, 51(21): 4146-4156.

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链接本文: https://www.chinaagrisci.com/CN/10.3864/j.issn.0578-1752.2018.21.013

https://www.chinaagrisci.com/CN/Y2018/V51/I21/4146

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