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Wang Y, Ma C, Wang S, Wu H, Chen X, Ma J, Wang L, Qiu HJ, Sun Y. Advances in the immunoescape mechanisms exploited by alphaherpesviruses. Front Microbiol 2024; 15:1392814. [PMID: 38962133 PMCID: PMC11221368 DOI: 10.3389/fmicb.2024.1392814] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2024] [Accepted: 05/27/2024] [Indexed: 07/05/2024] Open
Abstract
Alphaherpesviruses, categorized as viruses with linear DNA composed of two complementary strands, can potentially to induce diseases in both humans and animals as pathogens. Mature viral particles comprise of a core, capsid, tegument, and envelope. While herpesvirus infection can elicit robust immune and inflammatory reactions in the host, its persistence stems from its prolonged interaction with the host, fostering a diverse array of immunoescape mechanisms. In recent years, significant advancements have been achieved in comprehending the immunoescape tactics employed by alphaherpesviruses, including pseudorabies virus (PRV), herpes simplex virus (HSV), varicella-zoster virus (VZV), feline herpesvirus (FeHV), equine herpesvirus (EHV), and caprine herpesvirus type I (CpHV-1). Researchers have unveiled the intricate adaptive mechanisms existing between viruses and their natural hosts. This review endeavors to illuminate the research advancements concerning the immunoescape mechanisms of alphaherpesviruses by delineating the pertinent proteins and genes involved in virus immunity. It aims to furnish valuable insights for further research on related mechanisms and vaccine development, ultimately contributing to virus control and containment efforts.
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Affiliation(s)
- Yimin Wang
- Henan Institute of Science and Technology, Xinxiang, China
- Ministry of Education Key Laboratory for Animal Pathogens and Biosafety, Zhengzhou, China
| | - Caoyuan Ma
- Henan Institute of Science and Technology, Xinxiang, China
- Ministry of Education Key Laboratory for Animal Pathogens and Biosafety, Zhengzhou, China
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Shan Wang
- Henan Institute of Science and Technology, Xinxiang, China
- Ministry of Education Key Laboratory for Animal Pathogens and Biosafety, Zhengzhou, China
| | - Hongxia Wu
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Xuanqi Chen
- Henan Institute of Science and Technology, Xinxiang, China
- Ministry of Education Key Laboratory for Animal Pathogens and Biosafety, Zhengzhou, China
| | - Jinyou Ma
- Henan Institute of Science and Technology, Xinxiang, China
- Ministry of Education Key Laboratory for Animal Pathogens and Biosafety, Zhengzhou, China
| | - Lei Wang
- Henan Institute of Science and Technology, Xinxiang, China
- Ministry of Education Key Laboratory for Animal Pathogens and Biosafety, Zhengzhou, China
| | - Hua-Ji Qiu
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
| | - Yuan Sun
- Henan Institute of Science and Technology, Xinxiang, China
- Ministry of Education Key Laboratory for Animal Pathogens and Biosafety, Zhengzhou, China
- State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China
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A Comparison of Pseudorabies Virus Latency to Other A-Herpesvirinae Subfamily Members. Viruses 2022; 14:v14071386. [PMID: 35891367 PMCID: PMC9316381 DOI: 10.3390/v14071386] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Revised: 06/12/2022] [Accepted: 06/22/2022] [Indexed: 12/04/2022] Open
Abstract
Pseudorabies virus (PRV), the causative agent of Aujeszky’s disease, is one of the most important infectious pathogens threatening the global pig industry. Like other members of alphaherpesviruses, PRV establishes a lifelong latent infection and occasionally reactivates from latency after stress stimulus in infected pigs. Latent infected pigs can then serve as the source of recurrent infection, which is one of the difficulties for PRV eradication. Virus latency refers to the retention of viral complete genomes without production of infectious progeny virus; however, following stress stimulus, the virus can be reactivated into lytic infection, which is known as the latency-reactivation cycle. Recently, several research have indicated that alphaherpesvirus latency and reactivation is regulated by a complex interplay between virus, neurons, and the immune system. However, with those limited reports, the relevant advances in PRV latency are lagging behind. Therefore, in this review we focus on the regulatory mechanisms in PRV latency via summarizing the progress of PRV itself and that of other alphaherpesviruses, which will improve our understanding in the underlying mechanism of PRV latency and help design novel therapeutic strategies to control PRV latency.
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Deng J, Wu Z, Liu J, Ji Q, Ju C. The Role of Latency-Associated Transcripts in the Latent Infection of Pseudorabies Virus. Viruses 2022; 14:v14071379. [PMID: 35891360 PMCID: PMC9320458 DOI: 10.3390/v14071379] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2022] [Revised: 06/22/2022] [Accepted: 06/22/2022] [Indexed: 11/16/2022] Open
Abstract
Pseudorabies virus (PRV) can cause neurological, respiratory, and reproductive diseases in pigs and establish lifelong latent infection in the peripheral nervous system (PNS). Latent infection is a typical feature of PRV, which brings great difficulties to the prevention, control, and eradication of pseudorabies. The integral mechanism of latent infection is still unclear. Latency-associated transcripts (LAT) gene is the only transcriptional region during latent infection of PRV which plays the key role in regulating viral latent infection and inhibiting apoptosis. Here, we review the characteristics of PRV latent infection and the transcriptional characteristics of the LAT gene. We also analyzed the function of non-coding RNA (ncRNA) produced by the LAT gene and its importance in latent infection. Furthermore, we provided possible strategies to solve the problem of latent infection of virulent PRV strains in the host. In short, the detailed mechanism of PRV latent infection needs to be further studied and elucidated.
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A Review of Pseudorabies Virus Variants: Genomics, Vaccination, Transmission, and Zoonotic Potential. Viruses 2022; 14:v14051003. [PMID: 35632745 PMCID: PMC9144770 DOI: 10.3390/v14051003] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Revised: 05/05/2022] [Accepted: 05/05/2022] [Indexed: 12/16/2022] Open
Abstract
Pseudorabies virus (PRV), the causative agent of Aujeszky’s disease, has a broad host range including most mammals and avian species. In 2011, a PRV variant emerged in many Bartha K61-vaccinated pig herds in China and has attracted more and more attention due to its serious threat to domestic and wild animals, and even human beings. The PRV variant has been spreading in China for more than 10 years, and considerable research progresses about its molecular biology, pathogenesis, transmission, and host–virus interactions have been made. This review is mainly organized into four sections including outbreak and genomic evolution characteristics of PRV variants, progresses of PRV variant vaccine development, the pathogenicity and transmission of PRV variants among different species of animals, and the zoonotic potential of PRV variants. Considering PRV has caused a huge economic loss of animals and is a potential threat to public health, it is necessary to extensively explore the mechanisms involved in its replication, pathogenesis, and transmission in order to ultimately eradicate it in China.
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Bo Z, Miao Y, Xi R, Gao X, Miao D, Chen H, Jung YS, Qian Y, Dai J. Emergence of a novel pathogenic recombinant virus from Bartha vaccine and variant pseudorabies virus in China. Transbound Emerg Dis 2020; 68:1454-1464. [PMID: 32857916 DOI: 10.1111/tbed.13813] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2020] [Revised: 08/03/2020] [Accepted: 08/22/2020] [Indexed: 12/20/2022]
Abstract
Pseudorabies virus (PRV), the causative agent of Aujeszky's disease, has resulted in substantial economic losses in the swine industry worldwide. Previous reports have shown that the PRV variant is responsible for the Pseudorabies outbreaks in Bartha-K61-vaccinated farms in China. However, there is limited information about the evolution of recombination of the PRV variant. Here, we isolated two PRV variants from a Bartha-K61-vaccinated swine farm, named them the JSY7 and JYS13 strains, analysed their complete genomic sequences and evaluated pathogenicity. As results, the JSY7 and JSY13 strains showed different cytopathic effects and plaque sizes. The JSY7 and JSY13 strains had the same Aspartate insertions in the gE protein as other PRV variants. The JSY7 and JSY13 strains were clustered into the same clade based on a genomic phylogenetic analysis. However, the JSY7 strain was relatively close to recent PRV isolates in China, while the JSY13 strain was more closely related to earlier PRV isolates. Interestingly, the gC gene phylogenetic tree showed that the JSY7 strain belonged to genotype II lineage 3, while the JSY13 strain belonged to genotype I and is the same branch with the Bartha strain. Furthermore, the PRV variants were relatively distant from the Bartha strain in the phylogenetic analysis of the gB, gC and gD genes. Importantly, a recombination analysis showed that the JSY13 strain might be a natural recombinant between the minor parental genotype I Bartha strain and the major parental genotype II JSY7 strain. Finally, we also found that the JSY13 strain showed a moderate virulence compared to the JSY7 strain in mice. Taken together, our data provide direct evidence for genomic recombination of PRV in nature, which may play an important role in the evolution and virulence of PRV. This discovery suggests that live PRV vaccine can act as genetic donors for genomic recombination.
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Affiliation(s)
- Zongyi Bo
- MOE Joint International Research Laboratory of Animal Health and Food Safety, Key Laboratory of Animal Bacteriology, Ministry of Agriculture, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China
| | - Yurun Miao
- MOE Joint International Research Laboratory of Animal Health and Food Safety, Key Laboratory of Animal Bacteriology, Ministry of Agriculture, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China
| | - Rui Xi
- MOE Joint International Research Laboratory of Animal Health and Food Safety, Key Laboratory of Animal Bacteriology, Ministry of Agriculture, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China
| | - Xiaoyu Gao
- MOE Joint International Research Laboratory of Animal Health and Food Safety, Key Laboratory of Animal Bacteriology, Ministry of Agriculture, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China
| | - Denian Miao
- Institute of Animal Husbandary & Veterinary Science, Shanghai Academy of Agricultural Sciences, Shanghai, China
| | - Huan Chen
- MOE Joint International Research Laboratory of Animal Health and Food Safety, Key Laboratory of Animal Bacteriology, Ministry of Agriculture, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China
| | - Yong-Sam Jung
- MOE Joint International Research Laboratory of Animal Health and Food Safety, Key Laboratory of Animal Bacteriology, Ministry of Agriculture, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China
| | - Yingjuan Qian
- MOE Joint International Research Laboratory of Animal Health and Food Safety, Key Laboratory of Animal Bacteriology, Ministry of Agriculture, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China
| | - Jianjun Dai
- MOE Joint International Research Laboratory of Animal Health and Food Safety, Key Laboratory of Animal Bacteriology, Ministry of Agriculture, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China
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Liu Q, Wang X, Xie C, Ding S, Yang H, Guo S, Li J, Qin L, Ban F, Wang D, Wang C, Feng L, Ma H, Wu B, Zhang L, Dong C, Xing L, Zhang J, Chen H, Yan R, Wang X, Li W. A novel human acute encephalitis caused by pseudorabies virus variant strain. Clin Infect Dis 2020; 73:e3690-e3700. [PMID: 32667972 DOI: 10.1093/cid/ciaa987] [Citation(s) in RCA: 129] [Impact Index Per Article: 32.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2020] [Accepted: 07/10/2020] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND Pseudorabies virus (PRV) is a common pathogen in multiple animal species particularly in pigs. However, PRV infection in humans is rare and to the best of knowledge, PRV has never been isolated from human cases before. METHODS Four acute encephalitis cases in humans were confirmed as PRV infection based on clinical symptoms, laboratory diagnosis, and metagenomic next-generation sequencing (mNGS). Cerebrospinal fluid (CSF) samples were collected and applied for virus isolation. Etiological and genetic characteristics of this PRV human isolate were further determined. RESULTS The patients manifested respiratory dysfunction and acute neurological symptoms. The mNGS revealed PRV specific nucleotide sequences in patients' CSF samples (7-6198 reads and 0.2446%-80.58% coverage). The PRV envelope glycoprotein B antibody, glycoprotein E antibody, and neutralizing antibody were positively detected. For the first time, a PRV strain, designated hSD-1/2019, was isolated and identified from one CSF sample, and transmission electron microscopy revealed hSD-1/2019 had typical morphology similar to swine PRV. Phylogenetic analysis illustrated that hSD-1/2019 was genetically closest to those PRV variant strains currently circulating in pigs in China, and this strain showed similar etiological characteristics to Chinese PRV variant strains, while different from Chinese classical strain. Moreover, hSD-1/2019 showed high pathogenicity and induced acute neurological symptoms in pigs. CONCLUSIONS A PRV strain was isolated from an acute human encephalitis case. This isolate showed close phylogenetic relationships and similar etiological characteristics to Chinese PRV variant strains, implying the great risk of PRV transmission from pigs to humans.
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Affiliation(s)
- Qingyun Liu
- State Key Laboratory of Agricultural Microbiology, The Cooperative Innovation Center for Sustainable Pig Production, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, Hubei, China
| | - Xiaojuan Wang
- Department of Neurology, People's Hospital of Zhengzhou University, Henan People's Hospital, Zhengzhou, Henan, China
| | - Caihua Xie
- Henan Centre for Animal Diseases Control and Prevention, Zhengzhou, Henan, China; College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, Henan, China; College of Animal Science and Veterinary Medicine, Henan Agricultural University, Zhengzhou, Henan, China
| | - Shifang Ding
- Qilu Hospital of Shandong University, Jinan, Shandong, China
| | - Hongna Yang
- Qilu Hospital of Shandong University, Jinan, Shandong, China
| | - Shibang Guo
- State Key Laboratory of Agricultural Microbiology, The Cooperative Innovation Center for Sustainable Pig Production, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, Hubei, China
| | - Jixuan Li
- State Key Laboratory of Agricultural Microbiology, The Cooperative Innovation Center for Sustainable Pig Production, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, Hubei, China
| | - Lingzhi Qin
- Department of Neurology, People's Hospital of Zhengzhou University, Henan People's Hospital, Zhengzhou, Henan, China
| | - Fuguo Ban
- Henan Centre for Animal Diseases Control and Prevention, Zhengzhou, Henan, China; College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, Henan, China; College of Animal Science and Veterinary Medicine, Henan Agricultural University, Zhengzhou, Henan, China
| | - Dongfang Wang
- Henan Centre for Animal Diseases Control and Prevention, Zhengzhou, Henan, China; College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, Henan, China; College of Animal Science and Veterinary Medicine, Henan Agricultural University, Zhengzhou, Henan, China
| | - Cui Wang
- Henan Centre for Animal Diseases Control and Prevention, Zhengzhou, Henan, China; College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, Henan, China; College of Animal Science and Veterinary Medicine, Henan Agricultural University, Zhengzhou, Henan, China
| | - Lingxiao Feng
- People's Hospital of Zhengzhou University, Henan People's Hospital, Zhengzhou, Henan, China
| | - Haichang Ma
- Department of Neurology, People's Hospital of Zhengzhou University, Henan People's Hospital, Zhengzhou, Henan, China
| | - Bin Wu
- State Key Laboratory of Agricultural Microbiology, The Cooperative Innovation Center for Sustainable Pig Production, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, Hubei, China
| | - Liping Zhang
- Henan Centre for Animal Diseases Control and Prevention, Zhengzhou, Henan, China; College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, Henan, China; College of Animal Science and Veterinary Medicine, Henan Agricultural University, Zhengzhou, Henan, China
| | - Changxian Dong
- People's Hospital of Zhengzhou University, Henan People's Hospital, Zhengzhou, Henan, China
| | - Li Xing
- Binhai Genomics Institute, Tianjin Translational Genomics Center, BGI-Tianjin, BGI-Shenzhen, Tianjin, China
| | - Jiewen Zhang
- Department of Neurology, People's Hospital of Zhengzhou University, Henan People's Hospital, Zhengzhou, Henan, China
| | - Huanchun Chen
- State Key Laboratory of Agricultural Microbiology, The Cooperative Innovation Center for Sustainable Pig Production, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, Hubei, China
| | - Ruoqian Yan
- Henan Centre for Animal Diseases Control and Prevention, Zhengzhou, Henan, China; College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, Henan, China; College of Animal Science and Veterinary Medicine, Henan Agricultural University, Zhengzhou, Henan, China
| | - Xiangru Wang
- State Key Laboratory of Agricultural Microbiology, The Cooperative Innovation Center for Sustainable Pig Production, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, Hubei, China
| | - Wei Li
- Department of Neurology, People's Hospital of Zhengzhou University, Henan People's Hospital, Zhengzhou, Henan, China
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Lu JJ, Yuan WZ, Zhu YP, Hou SH, Wang XJ. Latent pseudorabies virus infection in medulla oblongata from quarantined pigs. Transbound Emerg Dis 2020; 68:543-551. [PMID: 32615031 DOI: 10.1111/tbed.13712] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2020] [Revised: 06/09/2020] [Accepted: 06/27/2020] [Indexed: 12/15/2022]
Abstract
Pseudorabies virus (PRV) is a major pathogen in pig husbandry and is also a risk to human well-being. Pigs with latent PRV infection carry the virus lifelong, and it can be activated under conducive conditions. This poses a very important challenge to the control of the virus and may even prevent its elimination. To investigate latent infection with wild-type (wt) PRV, and also infection due to the use of live attenuated vaccines on farms, 80 pigs from two large-scale swine operations were traced. At 6 months old, the quarantined pigs were slaughtered and brain samples were collected. A PCR assay targeting the gB and gE genes was developed to detect PRV DNA fragments in medulla oblongata. Five of the samples (6.3%) were gB and gE gene fragment double-positive, 60 of the samples (75%) were gB single-positive, and 15 samples (18.7%) showed double-negative. A portion of latency-associated transcripts (LATs), EP0 mRNA, were found to be present in the gB gene fragment positive samples. Furthermore, the five double-positive samples were transmitted blindly, and apparent cytopathic effects were found in three of the five samples in the fourth generation. By means of Western blotting, PCR and sequencing, two of the isolated viruses were found to be related to vaccine strain Bartha-K61. Another was closely related to domestic epidemic strains HN1201 and LA and relatively unrelated to other Asian isolates. These results suggest that the live vaccines are latently present in brains, in a manner similar to wt PRV, and this poses potential safety issues in the pig husbandry industry. Wt PRV and live vaccine viruses were found to co-exist in pigs, demonstrating that the live vaccines were unable to confer complete sterilizing immunity, which may explain outbreaks of pseudorabies on vaccinated farms.
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Affiliation(s)
- Jin-Jin Lu
- Key Laboratory of Animal Epidemiology of the Ministry of Agriculture, College of Veterinary Medicine, China Agricultural University, Beijing, China
| | - Wan-Zhe Yuan
- College of Veterinary Medicine, Hebei Agricultural University, Baoding, China
| | - Yong-Ping Zhu
- Agricultural Bureau of Wuzhong District, Suzhou, China
| | - Shao-Hua Hou
- Beijing Veterinary Research Institute of Chinese Academy of Agricultural Sciences, Beijing, China
| | - Xiao-Jia Wang
- Key Laboratory of Animal Epidemiology of the Ministry of Agriculture, College of Veterinary Medicine, China Agricultural University, Beijing, China
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Steinrigl A, Revilla-Fernández S, Kolodziejek J, Wodak E, Bagó Z, Nowotny N, Schmoll F, Köfer J. Detection and molecular characterization of Suid herpesvirus type 1 in Austrian wild boar and hunting dogs. Vet Microbiol 2012; 157:276-84. [DOI: 10.1016/j.vetmic.2011.12.033] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2011] [Revised: 12/20/2011] [Accepted: 12/23/2011] [Indexed: 12/29/2022]
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Pérez LJ, de Arce HD. Development of a polymerase chain reaction assay for the detection of pseudorabies virus in clinical samples. Braz J Microbiol 2009; 40:433-8. [PMID: 24031383 PMCID: PMC3768535 DOI: 10.1590/s1517-83822009000300002] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2008] [Revised: 07/23/2008] [Accepted: 05/03/2009] [Indexed: 11/28/2022] Open
Abstract
Aujeszky’s disease, also known as pseudorabies causes severe economic losses in swine industry and affects the pig husbandry all over the world. The conventional diagnostic procedure is time-consuming and false-negative results may occur in submissions from latently infected animals. The development, optimization and evaluation of a polymerase chain reaction (PCR) assay are presented for the diagnosis of pseudorabies infection. This assay was based on the amplification of a highly conserved viral gD gene fragment. PCR products of the expected size were obtained from PRV strains. Non-specific reactions were not observed when a related herpesvirus, other porcine DNA genome viruses and uninfected cells were used to assess PCR. The analytical sensitivity of the test was estimated to be 1.34 TCID50/ 50 uL. The analysis of tissue homogenate samples from naturally infected animals proved the potential usefulness of the method for a rapid disease diagnosis from field cases. A rapid, sensitive and specific PCR-based diagnostic assay to detect pseudorabies virus in clinical samples is provided.
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Affiliation(s)
- Lester J Pérez
- Grupo de Virología, Centro Nacional de Sanidad Agropecuaria. San José de las Lajas , La Habana , Cuba
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Meeusen ENT, Walker J, Peters A, Pastoret PP, Jungersen G. Current status of veterinary vaccines. Clin Microbiol Rev 2007; 20:489-510, table of contents. [PMID: 17630337 PMCID: PMC1932753 DOI: 10.1128/cmr.00005-07] [Citation(s) in RCA: 272] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The major goals of veterinary vaccines are to improve the health and welfare of companion animals, increase production of livestock in a cost-effective manner, and prevent animal-to-human transmission from both domestic animals and wildlife. These diverse aims have led to different approaches to the development of veterinary vaccines from crude but effective whole-pathogen preparations to molecularly defined subunit vaccines, genetically engineered organisms or chimeras, vectored antigen formulations, and naked DNA injections. The final successful outcome of vaccine research and development is the generation of a product that will be available in the marketplace or that will be used in the field to achieve desired outcomes. As detailed in this review, successful veterinary vaccines have been produced against viral, bacterial, protozoal, and multicellular pathogens, which in many ways have led the field in the application and adaptation of novel technologies. These veterinary vaccines have had, and continue to have, a major impact not only on animal health and production but also on human health through increasing safe food supplies and preventing animal-to-human transmission of infectious diseases. The continued interaction between animals and human researchers and health professionals will be of major importance for adapting new technologies, providing animal models of disease, and confronting new and emerging infectious diseases.
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Affiliation(s)
- Els N T Meeusen
- Animal Biotechnology Research Laboratories, Department of Physiology, Building 13f, Monash University, Clayton, Victoria 3800, Australia.
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A Yoon H, Aleyas AG, George JA, Park SO, Han YW, Hyun BH, Lee JH, Song HJ, Cho JG, Eo SK. Correlation between the nature of immunity induced by different immunogens and the establishment of latent infection by wild-type pseudorabies virus. Res Vet Sci 2006; 83:73-81. [PMID: 17196231 DOI: 10.1016/j.rvsc.2006.10.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2006] [Revised: 09/30/2006] [Accepted: 10/23/2006] [Indexed: 11/19/2022]
Abstract
To assess the correlation between the nature of immunity induced by different types of immunogens and the establishment of latent infection by wild-type pseudorabies virus (PrV), we used a murine model immunized with different immunogens, the PrV modified live vaccine (MLV), inactivated vaccine (IAV), and commercial oil-adjuvant subunit vaccine (OSV), via either intranasal (i.n.) or intramuscular (i.m.) route. Both MLV and IAV induced a different nature of immunity biased to Th1- and Th2-type, respectively, as judged by the ratio of PrV-specific IgG isotypes (IgG2a/IgG1) and the profile of cytokine IL-2, IL-4, and IFN-gamma production. In contrast, the OSV induced a lower isotype IgG2a to IgG1 ratio and higher level of IL-2 production. The MLV (inducing Th1-type) provided more effective protection against a virulent wild-type PrV challenge than IAV and OSV (inducing Th2- and mixed type, respectively). In addition, the MLV impeded the establishment of a latent infection with wild-type PrV, and the decrease in the PrV latency load by immunization with the MLV appeared to be mediated by the immune T-cells. These results demonstrate the substantial role of the immune responses driven by preceding vaccination in modulating the establishment of PrV latency caused by the post-infection of a field virus.
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Affiliation(s)
- Hyun A Yoon
- Department of Microbiology, Laboratory of Microbiology, College of Veterinary Medicine and Bio-Safety Research Institute, Chonbuk National University, Duckjin-ku, Duckjin-dong, Jeonju City, Chonbuk 561-756, Republic of Korea
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12
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Yoon HA, Eo SK, Aleyas AG, Cha SY, Lee JH, Chae JS, Jang HK, Cho EG, Song HJ. Investigation of pseudorabies virus latency in nervous tissues of seropositive pigs exposed to field strain. J Vet Med Sci 2006; 68:143-8. [PMID: 16520536 DOI: 10.1292/jvms.68.143] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The prevalence and quantity of latent pseudorabies virus (PrV) in nervous tissues of pigs exposed to field strain in Korea was investigated by nested and real-time PCR. Nervous tissues including trigeminal ganglion (TG), olfactory bulb (OB), and brain stem (BS) were collected from 94 seropositive pigs. PrV latent infection in nervous tissues was initially investigated by nested PCR targeting three glycoprotein genes (gB, gE, and gG). Based on the obtained result, latent infection was detected in 95.7% of screened animals. Furthermore, it was revealed that the examined tissues harbored different copy numbers of latent PrV genome ranging from <10(2.0) to 10(7.1) copies per microgram of genomic DNA in real-time PCR analysis. These results show that under normal conditions, levels of latent PrV in the nervous tissues of pigs can vary across a wide range. Therefore, the data presented here provides information regarding control of the endemic state of PrV in Korea.
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Affiliation(s)
- Hyun-A Yoon
- Laboratory of Microbiology, College of Veterinary Medicine and Bio-Safety Research Institute, Chonbuk National University, Jeonju 561-756, Republic of Korea
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Pomeranz LE, Reynolds AE, Hengartner CJ. Molecular biology of pseudorabies virus: impact on neurovirology and veterinary medicine. Microbiol Mol Biol Rev 2005; 69:462-500. [PMID: 16148307 PMCID: PMC1197806 DOI: 10.1128/mmbr.69.3.462-500.2005] [Citation(s) in RCA: 580] [Impact Index Per Article: 30.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Pseudorabies virus (PRV) is a herpesvirus of swine, a member of the Alphaherpesvirinae subfamily, and the etiological agent of Aujeszky's disease. This review describes the contributions of PRV research to herpesvirus biology, neurobiology, and viral pathogenesis by focusing on (i) the molecular biology of PRV, (ii) model systems to study PRV pathogenesis and neurovirulence, (iii) PRV transsynaptic tracing of neuronal circuits, and (iv) veterinary aspects of pseudorabies disease. The structure of the enveloped infectious particle, the content of the viral DNA genome, and a step-by-step overview of the viral replication cycle are presented. PRV infection is initiated by binding to cellular receptors to allow penetration into the cell. After reaching the nucleus, the viral genome directs a regulated gene expression cascade that culminates with viral DNA replication and production of new virion constituents. Finally, progeny virions self-assemble and exit the host cells. Animal models and neuronal culture systems developed for the study of PRV pathogenesis and neurovirulence are discussed. PRV serves asa self-perpetuating transsynaptic tracer of neuronal circuitry, and we detail the original studies of PRV circuitry mapping, the biology underlying this application, and the development of the next generation of tracer viruses. The basic veterinary aspects of pseudorabies management and disease in swine are discussed. PRV infection progresses from acute infection of the respiratory epithelium to latent infection in the peripheral nervous system. Sporadic reactivation from latency can transmit PRV to new hosts. The successful management of PRV disease has relied on vaccination, prevention, and testing.
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Affiliation(s)
- Lisa E Pomeranz
- Department of Molecular Biology, Princeton University, Princeton, New Jersey 08540, USA.
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14
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Abstract
Advancement in technology and science and our detailed knowledge of immunology, molecular biology, microbiology, and biochemistry among other basic science disciplines have defined new directions for vaccine development strategies. The applicability of genetic engineering and proteomics along with other new technologies have played pivotal roles in introducing novel ideas in vaccinology, and resulted in developing new vaccines and improving the quality of existing ones. Subunit vaccines, recombinant vaccines, DNA vaccines and vectored vaccines are rapidly gaining scientific and public acceptance as the new generation of vaccines and are seriously considered as alternatives to current conventional vaccines. The present review focuses on recent advances in veterinary vaccinology and addresses the effects and impact of modern microbiology, immunology, and molecular biology.
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Affiliation(s)
- Homayoun Shams
- Center for Pulmonary and Infectious Diseases Control, University of Texas Health Center at Tyler, 11937 US Highway 271, Tyler, TX 75708-3154, USA.
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15
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Abstract
Simian varicella virus (SVV) causes a natural varicella-like disease in nonhuman primates. Epizootics of simian varicella occur sporadically in facilities housing Old World monkeys. SVV is antigenically and genetically related to varicella-zoster virus (VZV), the etiologic agent of varicella (chickenpox) and herpes zoster (shingles) in humans. The SVV and VZV genomes are similar in size and structure, share 70%-75% DNA homology and are co-linear with respect to gene organisation. Simian varicella is a highly contagious disease characterised by fever and vesicular skin rash and may progress to pneumonia and hepatitis. Infected monkeys may resolve the disease within 2 weeks although epizootics are sometimes associated with high morbidity and mortality. SVV, like VZV, establishes life-long latent infection, as indicated by detection of viral DNA within neural ganglia. Subsequently, SVV may reactivate to cause secondary disease and spread of the virus to susceptible monkeys. The relatedness of VZV and SVV and the similarities in the clinical symptoms and pathogenesis of human and simian varicella make SVV infection of nonhuman primates an excellent animal model to investigate VZV pathogenesis and latency, and to evaluate potential antiviral strategies.
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Affiliation(s)
- Wayne L Gray
- Department of Microbiology and Immunology, 4301 West Markham Street, University of Arkansas for Medical Sciences, Little Rock, Arkansas 72205, USA.
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Ferrari M, Mettenleiter TC, Romanelli MG, Cabassi E, Corradi A, Dal Mas N, Silini R. A comparative study of pseudorabies virus (PRV) strains with defects in thymidine kinase and glycoprotein genes. J Comp Pathol 2000; 123:152-63. [PMID: 11032669 DOI: 10.1053/jcpa.2000.0406] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
In the course of two experiments, an examination was made of the virulence and neuroinvasiveness for pigs of two pseudorabies virus mutants (strain 6C2TK(-), with a defect in thymidine kinase (TK) function; and strain 6C2TK(-), gI(-)/gE(-), with defects in TK and glycoproteins I and E) and of the wild-type parent strain (86/27V). At various times after intranasal inoculation, pigs were killed and samples of tonsil, lung and different levels of the trigeminal and olfactory nervous pathways were examined by methods that included viral isolation, polymerase chain reaction assay and immunohistochemistry. Both mutant viruses were of reduced virulence, as indicated by no more than moderate clinical signs and lesions, and only sporadic isolation of virus; moreover, unlike the wild-type parent strain, the mutant viruses were not reactivated from the latent state by corticosteroid treatment. In addition, migration of the mutant strains to the central nervous system (olfactory and trigeminal nervous pathways) was reduced as compared with that of the wild-type strain. Thus, mutations in the genes encoding the TK enzyme and the gI/gE complex were associated with reduced virulence, reduced replication in peripheral target tissues, and reduced migration to the olfactory and trigeminal pathways.
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Affiliation(s)
- M Ferrari
- Istituto Zooprofilattico Sperimentale della Lombardia e dell>>Emilia Romagna, Via A. Bianchi 9, Brescia, 25125, Italy
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Jin L, Schnitzlein WM, Scherba G. Identification of the pseudorabies virus promoter required for latency-associated transcript gene expression in the natural host. J Virol 2000; 74:6333-8. [PMID: 10864643 PMCID: PMC112139 DOI: 10.1128/jvi.74.14.6333-6338.2000] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Expression of the latency-associated transcript (LAT) gene is a hallmark of alphaherpesvirus latency, and yet its control and function remain an enigma. Resolution of this problem will require verification and subsequent elimination or disabling of elements regulating LAT gene transcription so that the influence of the resultant RNA can be evaluated. Toward this end, we generated a novel pseudorabies virus (PrV) recombinant in which a 282-bp region containing the LAP1 (first latency-active promoter) consensus sequence was replaced by a reporter cassette. Despite this substitution, replication of the recombinant was comparable to that of the parental and rescuant viruses both in cultured mammalian cells and in the natural host, swine. Furthermore, production of the LAT gene-associated 2.0- and 8.0-kb RNAs during an in vitro lytic infection of cultured neuronal cells was unaffected. However, the otherwise constitutively produced and processed 8.4-kb LAT was not detected in porcine trigeminal ganglia latently infected with this novel recombinant, although the viral genome was shown to be present. Therefore, LAP1 is apparently the basal promoter for PrV LAT gene expression during viral latency but is not required for such activity during an in vitro lytic infection of neuronal cells. More importantly, the ability of PrV to persist in a latent state in the absence of LAT suggests that other factors are responsible for this event in the natural host.
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Affiliation(s)
- L Jin
- Department of Veterinary Pathobiology, University of Illinois, Urbana, Illinois 61802, USA
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Vilnis A, Sussman MD, Thacker BJ, Senn M, Maes RK. Vaccine genotype and route of administration affect pseudorabies field virus latency load after challenge. Vet Microbiol 1998; 62:81-96. [PMID: 9695282 DOI: 10.1016/s0378-1135(98)00200-4] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The influence of vaccine genotype and route of administration on the efficacy of pseudorabies virus (PRV) vaccines against virulent PRV challenge was evaluated in a controlled experiment using five genotypically distinct modified live vaccines (MLVs) for PRV. Several of these MLVs share deletions in specific genes, however, each has its deletion in a different locus within that gene. Pigs were vaccinated with each vaccine, either via the intramuscular or intranasal route, and subsequently challenged with a highly virulent PRV field strain. During a 2-week period following challenge with virulent PRV, each of the vaccine strains used in this study was evaluated for its effectiveness in the reduction of clinical signs, prevention of growth retardation and virulent virus shedding. One month after challenge, tissues were collected and analyzed for virulent PRV latency load by a recently developed method for the electrochemiluminescent quantitation of latent herpesvirus DNA in animal tissues after PCR amplification. It was determined that all vaccination protocols provided protection against clinical signs resulting from field virus challenge and reduced both field virus shedding and latency load after field virus challenge. Our results indicated that vaccine efficacy was significantly influenced by the modified live vaccine strain and route of administration. Compared to unvaccinated pigs, vaccination reduced field virus latency load in trigeminal ganglia, but significant differences were found between vaccines and routes of administration. We conclude that vaccine genotype plays a role in the effectiveness of PRV MLVs.
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Affiliation(s)
- A Vilnis
- Department of Microbiology, Michigan State University, East Lansing 48824, USA
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