Article(id=1238813309860892937, tenantId=1146029695717560320, journalId=1192105938417971205, issueId=1238813307784712441, articleNumber=null, orderNo=null, doi=10.13343/j.cnki.wsxb.20250836, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=research-article, receivedDate=1762444800000, receivedDateStr=2025-11-07, revisedDate=null, revisedDateStr=null, acceptedDate=1766592000000, acceptedDateStr=2025-12-25, onlineDate=1773285709109, onlineDateStr=2026-03-12, pubDate=1772553600000, pubDateStr=2026-03-04, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1773285709109, onlineIssueDateStr=2026-03-12, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1773285709109, creator=13701087609, updateTime=1773285709109, updator=13701087609, issue=Issue{id=1238813307784712441, tenantId=1146029695717560320, journalId=1192105938417971205, year='2026', volume='66', issue='3', pageStart='961', pageEnd='1466', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1773285708614, creator=13701087609, updateTime=1773291912509, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1238839328915378858, tenantId=1146029695717560320, journalId=1192105938417971205, issueId=1238813307784712441, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1238839328915378859, tenantId=1146029695717560320, journalId=1192105938417971205, issueId=1238813307784712441, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=1062, endPage=1073, ext={EN=ArticleExt(id=1238813310238380307, articleId=1238813309860892937, tenantId=1146029695717560320, journalId=1192105938417971205, language=EN, title=Research progress in enzootic nasal tumor virus of sheep and goats, columnId=1192149543727808575, journalTitle=Acta Microbiologica Sinica, columnName=Review, runingTitle=null, highlight=null, articleAbstract=

The enzootic nasal tumor of sheep and goats is a progressive and contagious disease caused by enzootic nasal tumor virus. It is mainly characterized by tumor growth in the mucosal epithelial tissue of the ethmoid bone and nasal turbinates within the nasal cavity of sheep and goats. In the later stage of the disease, the significant enlargement of tumor volume can lead to upper respiratory tract obstruction, which subsequently causes the affected animals to die of asphyxiation. This disease markedly reduces the production performance of infected animals, causing economic losses to the livestock industry. Moreover, it poses a threat to precious local breeds and core breeding flocks, resulting in the loss of high-quality breeding sheep. Consequently, it has become one of the major diseases threatening the sheep and goat industry. Currently, there are no vaccines or specific treatments for this disease. This article reviews enzootic nasal tumor virus in terms of the etiology, epidemiology, clinical symptoms, main pathological changes, diagnosis, and prevention and control, providing references and ideas for the prevention and control of this disease.

, correspAuthors=Chao YE, authorNote=null, correspAuthorsNote=
*E-mail:
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羊地方性鼻内肿瘤是由羊地方性鼻内肿瘤病毒感染引起的一种进行性、接触性传染病,主要表现为羊鼻内筛骨和鼻甲骨上皮黏膜组织出现肿瘤生长。在疾病后期,肿瘤体积显著增大可导致上呼吸道堵塞,进而使发病动物窒息死亡。该病会使感染动物的生产性能大幅下降,给畜牧业带来经济损失,且对珍贵的地方品种和核心种羊群构成威胁,造成优质种羊的损失,成为危害养羊业的重要疫病之一。目前尚无针对该病的疫苗和特效治疗方法。本文就羊地方性鼻内肿瘤病毒的病原学、流行病学、临床症状、主要病理变化、诊断及防治等方面进行综述,为该病的预防和控制提供借鉴与思路。

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作者贡献声明

仇婕:获取基金,撰写文章,编辑、审阅与修改;李浩林:审阅与修改;牛静轶:审阅;叶超:提出概念,获取基金,编辑、撰写文章、审阅。

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Research progress on sheep lung adenoma and local nasal tumors[J]. 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Molecular biology detection methods for ENTV

, figureFileSmall=null, figureFileBig=null, tableContent=

检测方法

Methods

靶标

Targets

引物/探针序列

Primer/probe sequences (5′→3′)

参考文献

References

RT-PCRENTV-gag

F: GCTGCTTTRAGACCTTATCGAAA

R: ATACTGCAGCYCGATGGCCAG

[60]
RT-PCRENTV-1-LTR

F: AAGCAAGTTAAGTAACTTGAGATC

R: GCTTAGCCGTCCTAAAAGAG

[2]
RT-PCRENTV-2-gag

F: AAATGCGACCTTCCGATAATGATGA

R: CTTCTGTAGCGGGGACATATT-CTCA

[61]
RT-qPCR (Probe)ENTV-2-env-U3

F: CCTAACCTTCATTCRTTATGGCARAGT

R: CACCGGATCCTTAYGTAATCRGATTTCCTG

Probe: FAM-TGTTTAGTTCCTTGCCTCCTTCGTGG-IBFQ

[17]
RT-qPCR (EvaGreen)ENTV-2-env

F: GAGGCAAATTGAGGCGTTGAT

R: CCCGTTCTGCATTCGCTGTAG

[62]
RT-qPCR (Probe)ENTV-2-env

F: ATGGCAATAGTTTATATCTGCAAT

R: GATGGCCTTGTATCAACATAAATGG

Probe: FAM-ATATAAGAATCCCGTAACACCTACATCTC-BHQ1

[63]
RT-qPCR (SYBRGreen)ENTV-2-gag

F: GTCCCTAAAAATGCGACCTT

R: GCGACTCCTGAGTTCTGTAAAACCAC

[64]
HRMENTV-2-env

F: TCATACTGTGGATTCCCTGTC

R: CTAACTACATCATATAAAGCTGATAGTC

[65]
RT-qPCR (Probe)ENTV-2-env

F: TGGTACGATGAGACTGCCTTAGAG

R: CACTTTCGTGACATTATATGACAGG

Probe: FAM-CCGCAAGGAAAGAAGTGTGAGCCTGATT-BHQ1

[66]
RT-qPCR (Probe)ENTV-2-pro

F: GCCTCCTATACAGTACTAGCACCTG

R: GATATTAGCTTCCGCTCCTAATAGA

Probe: FAM-TGCCTCCAGGGACAGCTGGATTGCTC-BHQ1

[67]
), ArticleFig(id=1238891100279206047, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1238813309860892937, language=CN, label=表1, caption=

ENTV的分子生物学检测方法

, figureFileSmall=null, figureFileBig=null, tableContent=

检测方法

Methods

靶标

Targets

引物/探针序列

Primer/probe sequences (5′→3′)

参考文献

References

RT-PCRENTV-gag

F: GCTGCTTTRAGACCTTATCGAAA

R: ATACTGCAGCYCGATGGCCAG

[60]
RT-PCRENTV-1-LTR

F: AAGCAAGTTAAGTAACTTGAGATC

R: GCTTAGCCGTCCTAAAAGAG

[2]
RT-PCRENTV-2-gag

F: AAATGCGACCTTCCGATAATGATGA

R: CTTCTGTAGCGGGGACATATT-CTCA

[61]
RT-qPCR (Probe)ENTV-2-env-U3

F: CCTAACCTTCATTCRTTATGGCARAGT

R: CACCGGATCCTTAYGTAATCRGATTTCCTG

Probe: FAM-TGTTTAGTTCCTTGCCTCCTTCGTGG-IBFQ

[17]
RT-qPCR (EvaGreen)ENTV-2-env

F: GAGGCAAATTGAGGCGTTGAT

R: CCCGTTCTGCATTCGCTGTAG

[62]
RT-qPCR (Probe)ENTV-2-env

F: ATGGCAATAGTTTATATCTGCAAT

R: GATGGCCTTGTATCAACATAAATGG

Probe: FAM-ATATAAGAATCCCGTAACACCTACATCTC-BHQ1

[63]
RT-qPCR (SYBRGreen)ENTV-2-gag

F: GTCCCTAAAAATGCGACCTT

R: GCGACTCCTGAGTTCTGTAAAACCAC

[64]
HRMENTV-2-env

F: TCATACTGTGGATTCCCTGTC

R: CTAACTACATCATATAAAGCTGATAGTC

[65]
RT-qPCR (Probe)ENTV-2-env

F: TGGTACGATGAGACTGCCTTAGAG

R: CACTTTCGTGACATTATATGACAGG

Probe: FAM-CCGCAAGGAAAGAAGTGTGAGCCTGATT-BHQ1

[66]
RT-qPCR (Probe)ENTV-2-pro

F: GCCTCCTATACAGTACTAGCACCTG

R: GATATTAGCTTCCGCTCCTAATAGA

Probe: FAM-TGCCTCCAGGGACAGCTGGATTGCTC-BHQ1

[67]
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羊地方性鼻内肿瘤病毒研究进展
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仇婕 , 李浩林 , 牛静轶 , 叶超 *
微生物学报 | 综述 2026,66(3): 1062-1073
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微生物学报 | 综述 2026, 66(3): 1062-1073
羊地方性鼻内肿瘤病毒研究进展
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仇婕, 李浩林, 牛静轶, 叶超*
作者信息
  • 西南大学 动物医学院,动物健康与动物性食品安全国际合作联合实验室,重庆
Research progress in enzootic nasal tumor virus of sheep and goats
Jie QIU, Haolin LI, Jingyi NIU, Chao YE*
Affiliations
  • Joint International Research Laboratory of Animal Health and Animal Food Safety, College of Veterinary Medicine, Southwest University, Chongqing, China
出版时间: 2026-03-04 doi: 10.13343/j.cnki.wsxb.20250836
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羊地方性鼻内肿瘤是由羊地方性鼻内肿瘤病毒感染引起的一种进行性、接触性传染病,主要表现为羊鼻内筛骨和鼻甲骨上皮黏膜组织出现肿瘤生长。在疾病后期,肿瘤体积显著增大可导致上呼吸道堵塞,进而使发病动物窒息死亡。该病会使感染动物的生产性能大幅下降,给畜牧业带来经济损失,且对珍贵的地方品种和核心种羊群构成威胁,造成优质种羊的损失,成为危害养羊业的重要疫病之一。目前尚无针对该病的疫苗和特效治疗方法。本文就羊地方性鼻内肿瘤病毒的病原学、流行病学、临床症状、主要病理变化、诊断及防治等方面进行综述,为该病的预防和控制提供借鉴与思路。

地方性鼻内肿瘤病毒  /  致病机理  /  流行病学  /  诊断

The enzootic nasal tumor of sheep and goats is a progressive and contagious disease caused by enzootic nasal tumor virus. It is mainly characterized by tumor growth in the mucosal epithelial tissue of the ethmoid bone and nasal turbinates within the nasal cavity of sheep and goats. In the later stage of the disease, the significant enlargement of tumor volume can lead to upper respiratory tract obstruction, which subsequently causes the affected animals to die of asphyxiation. This disease markedly reduces the production performance of infected animals, causing economic losses to the livestock industry. Moreover, it poses a threat to precious local breeds and core breeding flocks, resulting in the loss of high-quality breeding sheep. Consequently, it has become one of the major diseases threatening the sheep and goat industry. Currently, there are no vaccines or specific treatments for this disease. This article reviews enzootic nasal tumor virus in terms of the etiology, epidemiology, clinical symptoms, main pathological changes, diagnosis, and prevention and control, providing references and ideas for the prevention and control of this disease.

enzootic nasal tumor virus  /  pathogenic mechanism  /  epidemiology  /  diagnosis
仇婕, 李浩林, 牛静轶, 叶超. 羊地方性鼻内肿瘤病毒研究进展. 微生物学报, 2026 , 66 (3) : 1062 -1073 . DOI: 10.13343/j.cnki.wsxb.20250836
Jie QIU, Haolin LI, Jingyi NIU, Chao YE. Research progress in enzootic nasal tumor virus of sheep and goats[J]. Acta Microbiologica Sinica, 2026 , 66 (3) : 1062 -1073 . DOI: 10.13343/j.cnki.wsxb.20250836
羊地方性鼻内肿瘤(enzootic nasal adenocarcinoma, ENA)分为绵羊地方性鼻内肿瘤(enzootic nasal adenocarcinoma of sheep, ENAS)[1]和山羊地方性鼻内肿瘤(enzootic nasal adenocarcinoma of goats, ENAG)[2],分别由绵羊地方性鼻内肿瘤病毒(enzootic nasal tumor virus 1, ENTV-1)和山羊地方性鼻内肿瘤病毒(enzootic nasal tumor virus 2, ENTV-2)感染引起,是引起羊鼻内筛骨和鼻甲骨上皮黏膜组织出现一种进行性、接触性肿瘤的传染病[3],其病程发展速度受多种因素影响,在大多数病例中表现为慢性经过。该病主要临床表现为流鼻涕、打鼾、咳嗽、打喷嚏等上呼吸道症状,随着肿瘤生长,会出现呼吸困难、食欲减退、颅骨变形、眼眶突出等症状;该病呈世界性分布,除新西兰和澳大利亚外其他地区均有发生[2]。在不同地区其流行率介于0.1%-15%之间,发病率不超过5%,感染后死亡率可达100%[4]。我国不同地区均有ENA的报告,包括陕西、四川、安徽、重庆、广东、云南、福建等多个地区,严重损害了我国养羊业的发展,造成了较大的经济损失[5-11]。目前尚无针对该病的疫苗和特效治疗方法,主要依靠清除带病羊以达到净化的目的[12]。本文从羊地方性鼻内肿瘤病毒的病原学特点、致病机制、流行病学特征、诊断及防治措施等方面的研究进展进行介绍,以期为该病的预防和控制提供参考。
ENTV属于逆转录病毒科、正逆转录病毒亚科,其基因序列符合β逆转录病毒属特征[12]。它与绵羊肺腺瘤病毒(jaagsiekte sheep retrovirus, JSRV)、内源性逆转录病毒(endogenous retrovirus, ERV)高度同源[13]。因感染宿主不同,ENTV分为感染绵羊的ENTV-1[1]和感染山羊的ENTV-2[2]。在电镜下观察,ENTV-1和ENTV-2病毒粒子结构相似,均呈圆形或椭圆形;ENTV-1直径约80-110 nm,ENTV-2直径约90-110 nm,表面有大量纤突,内层为电子致密的类核[3]。ENTV病毒粒子形态及基因组结构与B型和D型逆转录病毒有相似之处,但不属于B型或D型中的任何一种,因此又被称为B/D嵌合型逆转录病毒[3]
虽然ENTV的体外细胞培养体系长期以来尚未成功建立,但近年来科研人员在此方向取得了可喜的研究进展。2010年,Walsh等[14]尝试建立了多株鼻肿瘤细胞克隆,但多数细胞克隆在传代至第5代时就丢失了ENTV-1前病毒,只有1个多克隆细胞系仍保留有ENTV-1前病毒,这些肿瘤细胞可能为体外研究ENTV-1提供一个系统。2016年,Walsh等[15]构建了首个ENTV-1的感染性分子克隆,将其转染到HEK 293T细胞中可产生成熟的病毒颗粒;该分子克隆产生的病毒可用于相关实验以实现科赫法则,并证明ENTV-1是诱导绵羊ENA的必要和充分条件。2024年,Li等[16]利用含血清培养体系从山羊肿瘤组织中分离、培养并纯化出了一株新的鼻腺癌细胞系,命名为“ENA-1细胞”;该细胞系传代稳定,可连续传至第17代时仍携带ENTV-2核酸,具备上皮型肿瘤的典型形态特征,具有很强的增殖潜能和致癌性;电子显微镜下还能在细胞质中观察到未成熟的病毒颗粒。以上研究提示该细胞系在作为ENTV-2的体外研究模型方面具有重要应用潜力。
ENTV的基因组是一个长度为7.5 kb的单股、正链RNA,具有逆转录病毒基因组结构特征。其基因组结构为5′-U5-gag-pro-pol-env-U3-3′,两端是5′和3′端的非翻译区和长末端重复序列(long terminal repeat, LTR),中间编码区由gagpropolenv这4个基因组成[17]。与高度同源的JSRV相比,ENTV-1与之在氨基酸序列的一致性为95%,二者存在差异的地方主要集中在3个主要区域,分别为env的3′端、LTR的非编码U3区域以及绵羊β逆转录病毒特有的编码区Orf-x[1]。在JSRV和ENTV-2的基因组中Orf-xpol中的一个备用开放阅读框,它在所有JSRV分离株中均是保守的,但预测的蛋白质尚未被检测到;相对而言,ENTV-1在Orf-x阅读框中包含2个终止密码子,这可能导致Orf-x蛋白无法正常表达,因此该蛋白很可能对ENTV-1复制过程不具有重要作用[18]
逆转录病毒LTR由U3-R-U5组成[7],ENTV LTR同其他逆转录病毒一样,其5′端LTR U3区域包含病毒复制所必需的顺式作用序列和病毒特异性启动子和增强子,后者主要负责逆转录病毒转录的调控信号;3′端LTR U3区域通过多聚腺苷酸化信号序列区终止病毒转录[14,19]。对于许多逆转录病毒,U3增强子元件以细胞类型特异性的方式驱动病毒基因表达[18]。JSRV与ENTV相比,U3区域之间的差异很大,可能会影响它们的转录特异性和细胞嗜性[20]
gag基因负责编码结构蛋白,调节病毒粒子的组装。gag编码产生gag蛋白前体,在蛋白酶的催化作用下,会裂解为基质蛋白(matrix protein, MA)、衣壳蛋白(capsid protein, CA)以及核衣壳蛋白(nucleocapsid protein, NC)[21-22]。MA主要介导蛋白质与病毒膜结构的结合过程[23];NC分子内部含有2个锌指结构域,有助于核衣壳锚定到基因组RNA上,调控NC与病毒基因组之间的结合效率及稳定性,共同构成病毒核心结构[21];CA是构成病毒粒子双层壳结构内层壳体的关键组分,同时对病毒粒子核心构造的形成和病毒进入细胞后的复制过程起重要作用[23]。对于逆转录病毒而言,Gag的氨基酸序列同源性较高,有大量逆转录病毒属的群特异性抗原,绝大多数逆转录病毒均能与针对该同源区的特异性抗体发生靶向结合反应[21]
pro基因编码一种双功能的蛋白酶,该蛋白通过核糖体的移码机制表达为gag-pro融合蛋白。Pro包含2个结构域,一个是蛋白酶样结构域,具有嘧啶脱氧核糖核苷三磷酸酶(deoxyuridine triphosphatase, dUTPase)活性,其他逆转录病毒也有该类结构域;另一个是活性蛋白酶(protease, PR)结构域[1]。在逆转录病毒中蛋白酶通常以无活性的蛋白前体存在于新组装的病毒颗粒中,当病毒颗粒从宿主细胞释放后,蛋白酶水解切割gaggag-pol前体多聚蛋白,使其成为成熟病毒颗粒的功能蛋白[24]
pol基因编码逆转录酶(reverse transcriptase, RT)和整合酶(integrase, IN)[3]pol通过核糖体移码表达为gag-pro-pol蛋白前体。对于逆转录病毒而言,RT以tRNA作为引物,病毒RNA为模板,催化合成互补的DNA,形成RNA-DNA杂化双链[21]。随后,杂化双链中的RNA被RT中的RNA酶活性水解,最后在DNA聚合酶活性下由负链DNA复制成双链DNA[25-26]。IN能够将逆转录产生的病毒DNA整合到宿主细胞的基因组中[1]pol内含有一个额外的开放阅读框,即Orf-x,是ENTV遗传多样性最高的蛋白质编码序列[1,27]
env基因编码囊膜糖蛋白,是一种I型跨膜蛋白,主要诱导肿瘤的发生[28]。Env含有2个切割位点,将其切割为表面蛋白(surface, SU)和跨膜蛋白(transmembrane, TM)[29]。SU能诱导宿主产生中和抗体,可用于抗体制备和特异性免疫检测[29],同时与细胞表面受体糖基磷脂酰肌醇锚定蛋白透明质酸酶2 (hyaluronidase 2, Hyal 2)结合,介导病毒与宿主细胞的结合[30]。TM直接参与病毒膜融合过程,其结构包含一个N端融合肽、一个中央卷曲螺旋区域、一个跨膜结构域以及一个C端胞质尾区[31]。Env的胞质尾区对其融合活性具有抑制作用,导致ENTV宿主感染范围窄,且构建的假病毒载体转导效率低;通过截短该区域,可解除其对融合活性的抑制,增强Env介导的靶细胞进入效率[32]
ENTV属于逆转录病毒。ENTV感染细胞后,病毒粒子附着在宿主细胞上,通过膜融合方式进入宿主细胞;在这个过程中Env蛋白的SU亚基首先与宿主细胞表面的受体Hyal 2结合,而且SU亚基上的2个氨基酸位点(N191、S195)在ENTV进入细胞过程中发挥关键作用[30,33]。当与受体结合后,SU亚基发生构象变化,最终引发TM亚基介导的膜融合[31]。与JSRV相比,ENTV的融合性和感染性较低,主要是其env调控融合活性的核心决定簇N191、S195结构不同,导致其对低pH条件下受体介导的融合触发不敏感,只有当pH低至4.0-4.5时才会促进TM亚基与宿主细胞的融合,继而进入宿主细胞内[33]。ENTV复制机制目前尚未得到明确研究,但可能与其他逆转录病毒如JSRV复制过程一致:病毒粒子进入细胞后,核衣壳降解,释放出病毒基因组RNA及逆转录所需的酶;在逆转录酶作用下,以病毒RNA为模板合成cDNA链;在IN催化下,将病毒DNA整合到宿主细胞的DNA中形成ENTV的前病毒;前病毒DNA利用宿主细胞的转录机制在RNA聚合酶作用下生成病毒RNA,进而通过宿主蛋白合成机制翻译出病毒蛋白,组装为未成熟的病毒粒子;组装完成的病毒从细胞释放后,通过蛋白酶切割实现成熟,最终形成具有感染性的子代病毒[34]
ENTV主要通过呼吸道黏膜感染,经发病羊产生的口鼻分泌物直接或间接传播,感染宿主鼻甲和鼻筛骨黏膜上皮细胞后产生致瘤性转化,引起鼻内肿瘤[1]。一般认为,env基因编码的包膜糖蛋白具有致癌性,可诱导肿瘤形成[28]gag基因也在肿瘤发生中发挥作用,研究表明,Gag蛋白通过激活JAK2-STAT5信号通路促进肿瘤的生长[35]。2002年Dirks等[28]将携带ENTV env基因的质粒pSX2.Eenv转染至NIH 3T3细胞,结果显示ENTV的Env蛋白可以转化培养的细胞,这很可能是动物肿瘤形成的原因。2006年,Wootton等[36]构建JSRV和ENTV的env基因腺病毒载体并在免疫缺陷小鼠体内表达,研究发现该载体仅诱发了小鼠肺部肿瘤,而在鼻腔中未观察到肿瘤组织增生,这表明ENTV env基因虽然在小鼠体内具有致瘤性,但不具有致瘤组织特异性,可能有其他因素介导了ENTV诱导肿瘤的组织特异性。同年,De Las Heras等[37]对采集的ENA和绵羊肺腺瘤病(ovine pulmonary adenomatosis, OPA)肿瘤组织进行常规免疫组化流程,使用磷酸化状态特异性抗体进行检测,结果表明2种肿瘤中均存在Raf-MEK-MAPK通路的激活。近年来,Maeda等[38-39]为了探究ENTV Env蛋白介导细胞转化的信号通路,先后构建ENTV-1 Env和ENTV-2 Env的表达载体进行转染,发现ENTV-1 Env和ENTV-2 Env都通过激活PI3K-Akt-mTOR和Ras-MEK-ERK两条信号通路诱导细胞转化,提示以上信号通路在ENTV致瘤机制中扮演重要角色。
在病毒感染致瘤过程中LTR U3区可影响肿瘤发生的组织特异性。2019年,Rosales Gerpe等[20]以JSRV病毒基因组为骨架,分别嵌合ENTV的不同基因片段,建立了ENTV-JSRV嵌合病毒,通过在使用嵌合病毒及带有ENTV Env (Eenv)与JSRV Env (Jenv)假型化慢病毒的离体绵羊肺组织和鼻甲组织切片模型中进行实验,发现JSRV和ENTV的组织嗜性是由包膜蛋白Env与U3启动子共同协调决定的。另外,ENTV-1、ENTV-2在LTR U3区的基因同源性低,即基因序列的差异较大,这种遗传差异导致ENTV-1、ENTV-2能够感染不同物种的鼻腔黏膜上皮细胞[1]。综上所述,ENTV的致病机理是一个复杂的过程,目前学术界尚未完全解析其相关机制。未来更为深入的研究将有助于剖析ENTV感染宿主并引发疾病的具体过程,为防控该病提供坚实的理论支撑。
ENA一年四季均可发生,在冬春寒冷时节病症更加明显,多呈散发,有时呈现地方性流行。不同地区感染羊群发病率差异很大,从0.1%-0.3%到2%-15%不等[5]。羊群中出现首例病例后数年,发病率会上升[3]。病羊及带毒羊是主要传染源,主要通过呼吸道黏膜感染,发病羊产生的口鼻分泌物直接或间接接触传播;除了鼻液,还可以通过患病羊的精液、乳汁垂直传播[40]。该病传播速度比较慢,潜伏期比较长,可达数月甚至数年[41]。主要易感动物为2-4岁的青年羊或成年羊[12],但也有幼龄羊感染ENTV的病例[42]。ENTV感染发病率不高,感染后从出现临床症状到死亡的病程为3周至9个月或更长时间,但死亡率可达100%[4]
ENA的发生最早于德国被记录[43],随后在阿尔及利亚[44]、加拿大[45]、西班牙[46]、土耳其[47]、巴西[48]等多个国家也相继出现ENA病例。除澳大利亚和新西兰外,几乎所有养殖山羊和绵羊的主要国家和地区均发现ENA感染[3]。我国目前发现的ENA以山羊中的ENTV-2感染为主。自1995年内蒙古[49]报告了第一例山羊ENA病例以来,ENA在我国中西部地区零星发生。近年来,山羊感染ENA不断蔓延,有逐渐扩大的趋势[50]。目前陕西[5]、四川[6]、安徽[7]、重庆[8]、广东[9]、云南[10]、福建[11]等多个地区均有报告ENA病例。
近年来,各国学者对来自不同地区的病毒基因组序列进行测定和分析,不断丰富了ENTV的遗传信息和变异特征。2010年,Walsh等[14]对来自加拿大和美国传统饲养的绵羊ENA临床样本中分离得到的10株ENTV-1进行了全基因组测序;序列分析结果显示,北美型ENTV-1 (ENTV-1 NA)与欧洲型ENTV-1 (ENTV-1 EU)的基因组序列一致性超过96%,亲缘关系极近,且所有ENTV-1分离株的氨基酸保守性非常高;在两者的序列差异中氨基酸差异主要集中在Orf-x基因区域;除Orf-x外,LTR是两者差异最集中的另一区域。
在ENTV-2遗传变异方面,2017年He等[51]通过逆转录PCR (reverse transcription PCR, RT-PCR)和进一步测序获得了来自陕西省的4个ENTV-2病毒分离株的完整基因组序列,序列分析显示与其他的ENTV-2毒株对比,主要序列差异存在于LTR、Gag的VR1和VR2、Orf-x以及Env TM区。2019年,Ye等[8]在重庆山羊养殖场通过RT-PCR检测到ENTV-2感染,并测定了其中一个毒株(CQ1)的完整序列;系统发育分析表明,ENTV-2毒株序列间存在高度的遗传异质性,可划分为2个主要谱系;谱系1由中国来源的毒株组成,并可进一步分为1.1、1.2、1.3和1.4四个亚系,其中CQ1单独属于1.3亚系;谱系2由英国报道的ENTV-2分离株组成。2024年,Li等[50]从重庆某山羊场获得了一株ENTV-2毒株(CQ2),通过对其全基因组测序和系统发育分析发现CQ2为不同亚谱系毒株间通过propol基因区重组形成的重组毒株。同年,李翎旭等[19]在安徽地区山羊感染ENTV-2的病例中采用RT-PCR扩增、测序和拼接获得2个ENTV-2毒株的全基因组序列,序列分析显示其与国内福建株、广西株同源性较高,并且处于同一进化分支,进一步丰富了我国ENTV-2的基因组数据库。2025年,Li等[52]在重庆市大足黑山羊养殖场的ENA病例中成功获得了ENTV-2全长基因组序列,命名为ENTV-2 CQ;系统发育分析显示,ENTV-2 CQ归属于ENTV-2分支,与中国本土流行毒株的同源性显著高于其他国家毒株;进一步分析发现,ENTV-2 CQ与福建株核苷酸同源性最高,二者位于同一主要进化分支,并与2015-2022年间中国多地的分离株密切相关,提示ENTV-2在中国可能存在地理聚集性的传播与进化特征。
ENA的临床诊断主要包括流行病学调查、临床症状及病理剖检等。山羊和绵羊的ENA临床症状相似,均表现为鼻孔有少量浆液性鼻液,且呼吸困难。结合早期典型临床症状(呼吸困难、打鼾、咳嗽、流鼻液)以及后期因鼻腔狭窄引发的呼吸音改变、面骨变形、消瘦甚至死亡等情况均可作为初步诊断依据,但这些早期症状与引起感冒样症状的疾病相似,如需确诊还需要进一步剖检[2,48]
剖检时肉眼可观察到鼻腔内有肿瘤组织生长,摘除肿瘤制作组织切片可用于病理组织学检查。沿矢状面打开颅骨,常可在筛骨区域内看见单侧或双侧肿瘤增生物。病变最早起源于鼻筛骨[3],鼻甲结构发生改变,形成多叶状或颗粒状的柔软息肉状组织[3,12]。随着肿瘤生长并入侵鼻骨、筛骨等周围健康组织,筛窦结构逐渐丧失,息肉完全填充该鼻区导致骨骼萎缩或变形,后期可见骨质完全软化或穿孔[3]。肿瘤颜色呈白色、灰白色或红色,质地柔软或坚硬,表面呈结节状、圆柱状或叶片状[49]。绵羊和山羊的鼻内肿瘤在肉眼观察下无重大差异,但山羊肿瘤中常见大量炎性息肉[3,49]。ENA肿瘤组织病理学特征高度相似,均为起源于筛骨黏膜浆液腺和黏液腺的腺上皮良性肿瘤。瘤细胞形态基本一致,排列成大小、形态不规则的腺泡,分化程度较高、无明显异型性[53]。以上均可作为ENA的临床诊断方法,但病理组织检查取材困难、程序繁琐、耗时长,不利于一线临床诊断。
长期以来,关于血清学检测ENTV特异性抗体的报道不多,且一般抗体检出率较低。多数研究者认为,ENTV等逆转录病毒具有免疫抑制性,不能刺激机体产生特异性免疫应答[54-56]。2014年,Walsh等[57]建立了酶联免疫吸附试验(enzyme-linked immunosorbent assay, ELISA)、蛋白质印记法和病毒中和技术,在绵羊血清中检测出ENTV-1的中和抗体,但研究发现血清抗体水平与疾病进程的关联性较弱。2016年,Walsh等[29]又从6只感染ENTV-1的羔羊血清中检测到了中和抗体,表明绵羊感染ENTV-1可以产生免疫反应,这一结果证实绵羊感染ENTV-1后可启动免疫应答,但其血清抗体检出率较低,提示病毒可能存在免疫逃避。2023年,江锦秀等[58]通过制备并纯化能稳定分泌ENTV-2特异性单克隆抗体(monoclonal antibody, MAb)的细胞株,建立了用于检测鼻液样品中ENTV-2的间接ELISA方法,实现了ENTV-2的快速鉴别,这为未来ENA的血清学诊断提供了新的思路。2025年,Zhao等[59]成功制备了抗ENTV-2衣壳蛋白p27的单克隆抗体和多克隆抗体,并鉴定出其中单克隆抗体所识别的表位在不同ENTV-2分离株中高度保守;基于此,该团队建立了一种抗原捕获酶联免疫吸附测定法(antigen capture ELISA, acELISA),采用上述单克隆抗体作为捕获抗体,多克隆抗体作为检测抗体,用于特异性检测鼻分泌物中的ENTV-2 p27蛋白。该方法具有较高的特异性、敏感性与可重复性,为ENTV-2感染的检测提供了可靠工具。
目前,用于检测ENTV的最广泛、常用的方法主要是分子生物学检测方法,如RT-PCR、RT-qPCR、巢氏及半巢氏PCR等(表1)。1996年,Cousens等[60]利用RT-PCR和限制性酶切分析法建立了ENTV的检测方法,能够同时鉴别ENTV-1和ENTV-2。2003年,Ortín等[2]建立了一种RT-PCR方法和半巢氏PCR方法。2014年,郝中香等[61]建立了山羊鼻内肿瘤病毒RT-PCR检测方法。然而,传统PCR敏感度低,且感染羊早期体内病毒载量不高,存在一定的局限性。更多学者开始研究实时荧光定量PCR,相较于传统PCR,荧光定量PCR特异性好、灵敏度高、操作便捷,还能够定性定量地检测核酸。2019年,Apostolidi等[17]针对ENTV-2的env基因建立了荧光探针的一管式RT-qPCR方法,最低检出限为5.7×101 copies/μL。同年,Huang等[62]建立了一种基于EvaGreen染料的实时荧光定量PCR检测方法,可用于检测ENTV-2,最低检出限为3.0×101 copies/μL。2021年,肖霜艳等[63]利用ENTV-2的env基因设计特异性引物和探针,建立了ENTV-2的荧光定量PCR检测方法。2021年,He等[64]利用ENTV-2的gag基因设计特异性引物和探针,建立了ENTV-2的SYBR Green实时荧光定量PCR检测方法,最低检测限为3.68×101 copies/μL。2022年,张靖鹏等[65]针对ENTV-2的env基因的保守序列设计1对特异性引物,建立高分辨率熔解曲线(high-resolution melting curve, HRM)检测方法,HRM具有特异性强、灵敏度高、重复性好、操作简单、价格低廉、检测快速等优点,最低检出限为8.27×101 copies/μL。2024年,李鹏飞等[66]利用ENTV-2 env基因保守区域设计引物,建立ENTV-2 TaqMan探针荧光定量RT-PCR检测方法,具有良好的特异性。这些检测方法为ENTV的检测提供了一种快捷、便利、准确的方法,也为ENA疾病的净化奠定了良好的基础。2025年,Li等[67]针对ENTV-2 pro基因的保守区设计出特异性引物与TaqMan探针,成功建立了一种RT-qPCR检测方法,可实现临床样本中病毒RNA的特异性扩增与定量检测;该方法的最低检出限为2.73×100 copies/μL,具有较好的检测灵敏度,为ENTV-2的分子诊断提供了有效工具。
影像学诊断对ENA早期诊断具有很高的诊断价值和参考意义[68],目前常见技术包括X线摄影、平扫及增强CT以及磁共振成像(magnetic resonance imaging, MRI);X射线检查可显示鼻腔内的密度改变,但受鼻腔结构复杂、组织重叠等因素影响,其准确性、清晰度及敏感性存在不足;CT能清晰呈现肿瘤的病变部位及周围骨质破坏情况;MRI则可有效鉴别肿瘤与鼻窦炎病变,更精准地明确病变范围及临床分期[69]。CT与MRI均可对ENA作出准确诊断,并能清晰显示肿瘤的位置、大小、边界及侵袭范围,但受限于层厚及空间分辨率,二者对早期微小病变的检出易出现漏诊。CT或MRI增强扫描通过造影剂强化病灶对比,可在一定程度上弥补这一技术局限。鉴于CT扫描速度较快且经济性较好,其可作为ENA影像学诊断的首选方法[68]。同时CT与临床检查相比,其诊断准确性更高。它能够可视化复杂的解剖结构,通过多平面重建,清晰显示肿瘤与周围骨骼、血管、气道的空间关系,避免二维图像的结构重叠;针对鼻腔气道设计了专用图像以评估气流,确保气道壁、气体、病变的边界清晰可辨,在涉及多处病变或病变不明确的病例中特别有价值[70]。然而,在临床实践中还需综合考量造影剂成本、辐射剂量控制及麻醉风险等实际因素。
在羊基因组中存在内源性逆转录病毒,其与ENTV在进化上高度同源,二者基因组均包含典型逆转录病毒结构基因(gagpropolenv)及LTR,且核苷酸一致性高达85%-89%。因此,内源性逆转录病毒可能诱导机体产生免疫耐受,使机体对ENTV缺乏有效的免疫应答[71],这给有效疫苗的开发带来诸多困难,目前尚无有效的疫苗或特效治疗方法可用于该病[59]。对于具有重要价值的动物可采用手术方法切除肿瘤以缓解动物呼吸困难、延长其生命,但这种方式并不能根除肿瘤。因此,当前防控ENA主要采用综合性防控措施,首先应加强生物安全措施,定期对养殖场进行消毒清洁,确保水源和饲料来源安全。同时,避免本场羊只与其他养殖场的羊只、人员、车辆交叉接触,严格执行引种检疫和隔离制度,防范病原传入[72]。其次,一旦发现疑似ENA病例,应立即对患病羊只进行隔离管控,及时开展PCR检测或剖检,同时对整群羊开展多轮鼻拭子PCR筛查。一经确诊,可考虑扑杀病羊、淘汰带毒羊以实现羊群净化[73]。最后,要加强日常饲养管理,降低羊群密度,增强羊群抵抗力,保持圈舍清洁卫生,定期对羊群开展病原检测,培育健康羊群[74]
ENA呈地方性流行,其潜伏期长,发病率虽相对较低,但致死率可达100%。该病导致羊的生产性能显著下降,给畜牧业造成较大经济损失。由于ENTV具有免疫应答缺失的特点,目前难以开发出有效的疫苗,同时缺乏商品化快速诊断试剂盒等产品,这为防控工作带来了持续挑战。未来需进一步加强对ENTV-1和ENTV-2的病原学方面研究,特别是与病毒组织嗜性和致病机理相关的基因功能研究。同时,应尽快建立稳定的体外细胞培养体系,并发展特异性强和灵敏度高的检测技术,为临床诊断提供可靠手段。此外,有必要在我国主要养羊区域开展流行病学调查,明确该病流行区域、流行规律及传播特征,为科学制订针对ENA的预防、控制措施以及后续净化方案提供重要依据。
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2026年第66卷第3期
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doi: 10.13343/j.cnki.wsxb.20250836
  • 接收时间:2025-11-07
  • 首发时间:2026-03-12
  • 出版时间:2026-03-04
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  • 收稿日期:2025-11-07
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College Students’ Innovation and Entrepreneurship Training Program of Southwest University(S202410635049)
西南大学大学生创新创业训练计划(S202410635049)
Chongqing Modern Agricultural Industry Technology System(CQMAITS202513)
重庆市现代农业产业技术体系(草食牲畜)创新团队项目(CQMAITS202513)
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    西南大学 动物医学院,动物健康与动物性食品安全国际合作联合实验室,重庆

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2种不同金属材料的力学参数

Family
属数
Number of
genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)

Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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