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Huang X, Liu W. Role of microRNAs in host defense against porcine reproductive and respiratory syndrome virus infection: a hidden front line. Front Immunol 2024; 15:1376958. [PMID: 38590524 PMCID: PMC10999632 DOI: 10.3389/fimmu.2024.1376958] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2024] [Accepted: 03/13/2024] [Indexed: 04/10/2024] Open
Abstract
Porcine reproductive and respiratory syndrome virus (PRRSV) is one of the most globally devastating viruses threatening the swine industry worldwide. Substantial advancements have been achieved in recent years towards comprehending the pathogenesis of PRRSV infection and the host response, involving both innate and adaptive immune responses. Not only a multitude of host proteins actively participate in intricate interactions with viral proteins, but microRNAs (miRNAs) also play a pivotal role in the host response to PRRSV infection. If a PRRSV-host interaction at the protein level is conceptualized as the front line of the battle between pathogens and host cells, then their fight at the RNA level resembles the hidden front line. miRNAs are endogenous small non-coding RNAs of approximately 20-25 nucleotides (nt) that primarily regulate the degradation or translation inhibition of target genes by binding to the 3'-untranslated regions (UTRs). Insights into the roles played by viral proteins and miRNAs in the host response can enhance our comprehensive understanding of the pathogenesis of PRRSV infection. The intricate interplay between viral proteins and cellular targets during PRRSV infection has been extensively explored. This review predominantly centers on the contemporary understanding of the host response to PRRSV infection at the RNA level, in particular, focusing on the twenty-six miRNAs that affect viral replication and the innate immune response.
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Affiliation(s)
- Xuewei Huang
- College of Veterinary Medicine, Qingdao Agricultural University, Qingdao, China
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2
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Hu W, Zheng H, Li Q, Wang Y, Liu X, Hu X, Liu W, Liu S, Chen Z, Feng W, Cai X, Li N. shRNA transgenic swine display resistance to infection with the foot-and-mouth disease virus. Sci Rep 2021; 11:16377. [PMID: 34385528 PMCID: PMC8361160 DOI: 10.1038/s41598-021-95853-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2020] [Accepted: 07/29/2021] [Indexed: 12/15/2022] Open
Abstract
Foot-and-mouth disease virus (FMDV) is one of the most important animal pathogens in the world. FMDV naturally infects swine, cattle, and other cloven-hoofed animals. FMD is not adequately controlled by vaccination. An alternative strategy is to develop swine that are genetically resistant to infection. Here, we generated FMDV-specific shRNA transgenic cells targeting either nonstructural protein 2B or polymerase 3D of FMDV. The shRNA-positive transgenic cells displayed significantly lower viral production than that of the control cells after infection with FMDV (P < 0.05). Twenty-three transgenic cloned swine (TGCS) and nine non-transgenic cloned swine (Non-TGCS) were produced by somatic cell nuclear transfer (SCNT). In the FMDV challenge study, one TGCS was completely protected, no clinical signs, no viremia and no viral RNA in the tissues, no non-structural antibody response, another one TGCS swine recovered after showing clinical signs for two days, whereas all of the normal control swine (NS) and Non-TGCS developed typical clinical signs, viremia and viral RNA was determined in the tissues, the non-structural antibody was determined, and one Non-TGCS swine died. The viral RNA load in the blood and tissues of the TGCS was reduced in both challenge doses. These results indicated that the TGCS displayed resistance to the FMDV infection. Immune cells, including CD3+, CD4+, CD8+, CD21+, and CD172+ cells, and the production of IFN-γ were analyzed, there were no significant differences observed between the TGCS and NS or Non-TGCS, suggesting that the FMDV resistance may be mainly derived from the RNAi-based antiviral pathway. Our work provides a foundation for a breeding approach to preventing infectious disease in swine.
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Affiliation(s)
- Wenping Hu
- State Key Laboratory of AgroBiotechnology, China Agricultural University, Beijing, China.,Key Laboratory of Animal Genetics and Breeding and Reproduction of Ministry of Agriculture and Rural Affairs, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100193, China
| | - Haixue Zheng
- State Key Laboratory of Veterinary Etiological Biology, National Foot and Mouth Diseases Reference Laboratory, Lanzhou Veterinarian Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, Gansu, China
| | - Qiuyan Li
- State Key Laboratory of AgroBiotechnology, China Agricultural University, Beijing, China.,Beijing Genprotein Biotechnology Company, Beijing, China
| | - Yuhang Wang
- State Key Laboratory of AgroBiotechnology, China Agricultural University, Beijing, China
| | - Xiangtao Liu
- State Key Laboratory of Veterinary Etiological Biology, National Foot and Mouth Diseases Reference Laboratory, Lanzhou Veterinarian Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, Gansu, China
| | - Xiaoxiang Hu
- State Key Laboratory of AgroBiotechnology, China Agricultural University, Beijing, China
| | - Wenjie Liu
- State Key Laboratory of AgroBiotechnology, China Agricultural University, Beijing, China
| | - Shen Liu
- State Key Laboratory of AgroBiotechnology, China Agricultural University, Beijing, China
| | - Zhisheng Chen
- State Key Laboratory of AgroBiotechnology, China Agricultural University, Beijing, China
| | - Wenhai Feng
- State Key Laboratory of AgroBiotechnology, China Agricultural University, Beijing, China
| | - Xuepeng Cai
- State Key Laboratory of Veterinary Etiological Biology, National Foot and Mouth Diseases Reference Laboratory, Lanzhou Veterinarian Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, Gansu, China.
| | - Ning Li
- State Key Laboratory of AgroBiotechnology, China Agricultural University, Beijing, China.
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3
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You X, Qu Y, Zhang Y, Huang J, Gao X, Huang C, Luo G, Liu Q, Liu M, Xu D. Mir-331-3p Inhibits PRRSV-2 Replication and Lung Injury by Targeting PRRSV-2 ORF1b and Porcine TNF-α. Front Immunol 2020; 11:547144. [PMID: 33072088 PMCID: PMC7544944 DOI: 10.3389/fimmu.2020.547144] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Accepted: 08/18/2020] [Indexed: 12/27/2022] Open
Abstract
Porcine reproductive and respiratory syndrome (PRRS) caused by a single-stranded RNA virus (PRRSV) is a highly infectious respiratory disease and leads to huge economic losses to the swine industry worldwide. To investigate the role of miRNAs in the infection and lung injury induced by PRRSV, the differentially expressed miRNAs (DE-miRs) were isolated from PRRSV-2 infected/mock-infected PAMs of Meishan, Landrace, Pietrain, and Qingping pigs at 9, 36, and 60 hpi. Mir-331-3p was the only common DE-miR in each set of miRNA expression profile at 36 hpi. Mir-210 was one of 7 common DE-miRs between PRRSV infected and mock-infected PAMs of Meishan, Pietrain, and Qingping pigs at 60 hpi. Mir-331-3p/mir-210 could target PRRSV-2 ORF1b, bind and downregulate porcine TNF-α/STAT1 expression, and inhibit PRRSV-2 replication, respectively. Furthermore, STAT1 and TNF-α could mediate the transcriptional activation of MCP-1, VCAM-1, and ICAM-1. STAT1 could also upregulate the expression of TNF-α by binding to its promoter region. In vivo, pEGFP-N1-mir-331-3p could significantly reduce viral replication and pathological changes in PRRSV-2 infected piglets. Taken together, Mir-331-3p/mir-210 have significant roles in the infection and lung injury caused by PRRSV-2, and they may be promising therapeutic targets for PRRS and lung injury/inflammation.
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Affiliation(s)
- Xiangbin You
- Key Laboratory of Swine Genetics and Breeding of Ministry of Agriculture and Rural Affairs, Huazhong Agricultural University, Wuhan, China.,Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education, Huazhong Agricultural University, Wuhan, China.,Colleges of Animal Science and Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
| | - Yilin Qu
- Key Laboratory of Swine Genetics and Breeding of Ministry of Agriculture and Rural Affairs, Huazhong Agricultural University, Wuhan, China.,Colleges of Animal Science and Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
| | - Yue Zhang
- Colleges of Animal Science and Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
| | - Jingshu Huang
- Agricultural Development Center of Hubei Province, Wuhan, China
| | - Xiaoxiao Gao
- Key Laboratory of Swine Genetics and Breeding of Ministry of Agriculture and Rural Affairs, Huazhong Agricultural University, Wuhan, China.,Colleges of Animal Science and Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
| | - Chengyu Huang
- Key Laboratory of Swine Genetics and Breeding of Ministry of Agriculture and Rural Affairs, Huazhong Agricultural University, Wuhan, China.,Colleges of Animal Science and Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
| | - Gan Luo
- Key Laboratory of Swine Genetics and Breeding of Ministry of Agriculture and Rural Affairs, Huazhong Agricultural University, Wuhan, China.,Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education, Huazhong Agricultural University, Wuhan, China.,Colleges of Animal Science and Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
| | - Qian Liu
- Key Laboratory of Swine Genetics and Breeding of Ministry of Agriculture and Rural Affairs, Huazhong Agricultural University, Wuhan, China.,Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education, Huazhong Agricultural University, Wuhan, China.,Colleges of Animal Science and Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
| | - Min Liu
- Key Laboratory of Swine Genetics and Breeding of Ministry of Agriculture and Rural Affairs, Huazhong Agricultural University, Wuhan, China.,Colleges of Animal Science and Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
| | - Dequan Xu
- Key Laboratory of Swine Genetics and Breeding of Ministry of Agriculture and Rural Affairs, Huazhong Agricultural University, Wuhan, China.,Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education, Huazhong Agricultural University, Wuhan, China.,Colleges of Animal Science and Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
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4
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Wang H, Shen L, Chen J, Liu X, Tan T, Hu Y, Bai X, Li Y, Tian K, Li N, Hu X. Deletion of CD163 Exon 7 Confers Resistance to Highly Pathogenic Porcine Reproductive and Respiratory Viruses on Pigs. Int J Biol Sci 2019; 15:1993-2005. [PMID: 31523199 PMCID: PMC6743298 DOI: 10.7150/ijbs.34269] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2019] [Accepted: 05/19/2019] [Indexed: 11/05/2022] Open
Abstract
Porcine reproductive and respiratory syndrome (PRRS) caused by PRRS virus (PRRSV) is a severe infectious disease in the swine industry. PRRSV infection is mediated by porcine CD163 (pCD163). Scavenger receptor cysteine-rich domain 5 coded by exon 7 of pCD163 is essential for PRRSV infection. In this study, we generated CD163 exon 7 deleted (CD163E7D) pigs using CRISPR/Cas9 mediated homologous recombination and somatic cell nuclear transfer (SCNT). The deletion of exon 7 had no adverse effects on CD163-associated functions. Pigs were further challenged with a highly pathogenic PRRSV (HP-PRRSV) strain. The CD163E7D pigs exhibited mild clinical symptoms and had decreased viral loads in blood. All CD163E7D pigs survived the viral challenge, while all the WT pigs displayed severe symptoms, and 2 out of 6 WT pigs died during the challenge. Our results demonstrated that CD163 exon 7 deletion confers resistance to HP-PRRSV infection without impairing the biological functions of CD163.
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Affiliation(s)
- Haitao Wang
- State Key Laboratory for Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing, China.,National Engineering Laboratory for Animal Breeding, China Agricultural University, Beijing, China
| | - Liangcai Shen
- State Key Laboratory for Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing, China.,National Engineering Laboratory for Animal Breeding, China Agricultural University, Beijing, China
| | - Jingyao Chen
- State Key Laboratory for Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing, China.,National Engineering Laboratory for Animal Breeding, China Agricultural University, Beijing, China
| | - Xiaojuan Liu
- State Key Laboratory for Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing, China.,National Engineering Laboratory for Animal Breeding, China Agricultural University, Beijing, China
| | - Tan Tan
- State Key Laboratory for Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing, China.,National Engineering Laboratory for Animal Breeding, China Agricultural University, Beijing, China
| | - Yiqing Hu
- State Key Laboratory for Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing, China.,National Engineering Laboratory for Animal Breeding, China Agricultural University, Beijing, China
| | - Xiaofei Bai
- National Research Center for Veterinary Medicine, Luoyang, Henan Province, China
| | - Yuexin Li
- State Key Laboratory for Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing, China.,National Engineering Laboratory for Animal Breeding, China Agricultural University, Beijing, China
| | - Kegong Tian
- National Research Center for Veterinary Medicine, Luoyang, Henan Province, China.,College of Animal Science and Veterinary Medicine, Henan Agricultural University, Zhengzhou, Henan Province, China
| | - Ning Li
- State Key Laboratory for Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing, China.,National Engineering Laboratory for Animal Breeding, China Agricultural University, Beijing, China
| | - Xiaoxiang Hu
- State Key Laboratory for Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing, China.,National Engineering Laboratory for Animal Breeding, China Agricultural University, Beijing, China
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5
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Liu J, Ma C, Zhang X, You J, Dong M, Chen L, Jiang P, Yun S. Molecular detection of Hsp90 inhibitor suppressing PCV2 replication in host cells. Microb Pathog 2019; 132:51-58. [PMID: 31028862 DOI: 10.1016/j.micpath.2019.04.037] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2019] [Revised: 04/15/2019] [Accepted: 04/23/2019] [Indexed: 11/19/2022]
Abstract
Porcine Circovirus Type 2 (PCV2) is a pathogen that has the ability to cause devastating disease manifestations in pig populations with major economic implications. Our previous research found that Hsp90 is required for PCV2 production in PK-15 and 3D4/31 cells. The aim of this study was to evaluate the effect of Hsp90 inhibitor regulating PCV2 replication and to explore its underlying mechanism. In PK-15 and 3D4/31 cells treated with 17-AAG after viral adsorption, replication of PCV2 was attenuated as assessed by quantitating the expression of viral protein. Following NF-κB activation it was observed that 24hpi with PCV2 was significantly inhibited in the presence of 17-AAG. The expression of Hsp90 associated client proteins in PCV2-infected cells were also reduced in the presence of 17-AAG. However, treatment with MG-132 failed to rescue 17-AAG mediated reduction of PCV2 production in host cells. Thus, Hsp90 regulates PCV2 by modulating cellular signaling proteins. These results highlight the importance of cellular proteins during PCV2 infection and the possibility of targeting cellular chaperones for developing new anti-rotaviral strategies.
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Affiliation(s)
- Jie Liu
- Department of Comparative Medicine, Jinling Hospital, No.305 East Zhongshan Road, Nanjing, 210002, PR China
| | - Chang Ma
- Department of Comparative Medicine, Jinling Hospital, No.305 East Zhongshan Road, Nanjing, 210002, PR China
| | - Xuliang Zhang
- Department of Comparative Medicine, Jinling Hospital, No.305 East Zhongshan Road, Nanjing, 210002, PR China
| | - Jinwei You
- Department of Comparative Medicine, Jinling Hospital, No.305 East Zhongshan Road, Nanjing, 210002, PR China
| | - Min Dong
- Department of Comparative Medicine, Jinling Hospital, No.305 East Zhongshan Road, Nanjing, 210002, PR China
| | - Li Chen
- Department of Comparative Medicine, Jinling Hospital, No.305 East Zhongshan Road, Nanjing, 210002, PR China
| | - Ping Jiang
- Key Laboratory of Animal Diseases Diagnostic and Immunology, Ministry of Agriculture, MOE International Joint Collaborative Research Laboratory for Animal Health & Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, 210095, PR China
| | - Shifeng Yun
- Department of Comparative Medicine, Jinling Hospital, No.305 East Zhongshan Road, Nanjing, 210002, PR China.
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6
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Chin WX, Ang SK, Chu JJH. Recent advances in therapeutic recruitment of mammalian RNAi and bacterial CRISPR-Cas DNA interference pathways as emerging antiviral strategies. Drug Discov Today 2017; 22:17-30. [DOI: 10.1016/j.drudis.2016.08.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2016] [Revised: 07/20/2016] [Accepted: 08/19/2016] [Indexed: 01/01/2023]
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7
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Liu J, Zhang X, Ma C, You J, Dong M, Yun S, Jiang P. Heat shock protein 90 is essential for replication of porcine circovirus type 2 in PK-15 cells. Virus Res 2016; 224:29-37. [PMID: 27553861 DOI: 10.1016/j.virusres.2016.08.009] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2016] [Revised: 08/17/2016] [Accepted: 08/17/2016] [Indexed: 12/20/2022]
Abstract
Porcine circovirus type 2 (PCV2) is recognized as the causative agent of porcine circovirus-associated disease (PCVAD). However, the mechanism of PCV2 replication has not been understood completely. Heat shock protein 90 (Hsp90) plays an important role in viral genome replication, viral genes expression, and viral particle packaging. In this study, we firstly found that inhibition of Hsp90 by pretreatment of host cells with 17-AAG, a specific inhibitor of Hsp90, or blocking Hsp90α/Hsp90β with siRNA, resulted in significantly reduced viral replication in PK-15 cells. But inhibition of Hsp90 by 17-AAG did not affect PCV2 entry into the host cells. Meanwhile, over-expression of Hsp90α/Hsp90β enhanced PCV2 genome replication and virion production. In addition, Hsp90β was enriched in the nuclear zone in the cells infected with PCV2. But it did not interact with the viral Cap/Rep proteins. It suggested that Hsp90 is required for PCV2 production in PK-15 cells culture. It should be helpful for further evaluating the mechanism of replication and pathogenesis of PCV2 and developing novel antiviral therapies.
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Affiliation(s)
- Jie Liu
- Department of Comparative Medicine, Jinling Hospital, 305 East Zhongshan Road, Nanjing 210002, PR China
| | - Xuliang Zhang
- Department of Comparative Medicine, Jinling Hospital, 305 East Zhongshan Road, Nanjing 210002, PR China
| | - Chang Ma
- Department of Comparative Medicine, Jinling Hospital, 305 East Zhongshan Road, Nanjing 210002, PR China
| | - Jinwei You
- Department of Comparative Medicine, Jinling Hospital, 305 East Zhongshan Road, Nanjing 210002, PR China
| | - Min Dong
- Department of Comparative Medicine, Jinling Hospital, 305 East Zhongshan Road, Nanjing 210002, PR China
| | - Shifeng Yun
- Department of Comparative Medicine, Jinling Hospital, 305 East Zhongshan Road, Nanjing 210002, PR China.
| | - Ping Jiang
- Key Laboratory of Animal Diseases Diagnostic and Immunology, Ministry of Agriculture, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, PR China.
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8
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Yao J, Huang J, Zhao J. Genome editing revolutionize the creation of genetically modified pigs for modeling human diseases. Hum Genet 2016; 135:1093-105. [DOI: 10.1007/s00439-016-1710-6] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2016] [Accepted: 07/06/2016] [Indexed: 01/03/2023]
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9
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Presloid JB, Novella IS. RNA Viruses and RNAi: Quasispecies Implications for Viral Escape. Viruses 2015; 7:3226-40. [PMID: 26102581 PMCID: PMC4488735 DOI: 10.3390/v7062768] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2015] [Revised: 06/04/2015] [Accepted: 06/17/2015] [Indexed: 12/16/2022] Open
Abstract
Due to high mutation rates, populations of RNA viruses exist as a collection of closely related mutants known as a quasispecies. A consequence of error-prone replication is the potential for rapid adaptation of RNA viruses when a selective pressure is applied, including host immune systems and antiviral drugs. RNA interference (RNAi) acts to inhibit protein synthesis by targeting specific mRNAs for degradation and this process has been developed to target RNA viruses, exhibiting their potential as a therapeutic against infections. However, viruses containing mutations conferring resistance to RNAi were isolated in nearly all cases, underlining the problems of rapid viral evolution. Thus, while promising, the use of RNAi in treating or preventing viral diseases remains fraught with the typical complications that result from high specificity of the target, as seen in other antiviral regimens.
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Affiliation(s)
- John B Presloid
- Department of Medical Microbiology and Immunology, College of Medicine, The University of Toledo, 3055 Arlington Avenue, Toledo, OH 43614, USA.
| | - Isabel S Novella
- Department of Medical Microbiology and Immunology, College of Medicine, The University of Toledo, 3055 Arlington Avenue, Toledo, OH 43614, USA.
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10
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Ayudhya SNN, Assavacheep P, Thanawongnuwech R. One world--one health: the threat of emerging swine diseases. An Asian perspective. Transbound Emerg Dis 2015; 59 Suppl 1:9-17. [PMID: 25471241 PMCID: PMC7169793 DOI: 10.1111/j.1865-1682.2011.01309.x] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
Abstract
Owing to the expanding globalization, the trans‐boundary spread of an epizootic can easily result from uncontrolled animal movements and human traffic. Foot and mouth disease (FMD) is a major trans‐boundary disease in most Asian countries. Its sporadic re‐emergence suggests that collaborative FMD control strategies should be uniformly implemented in endemic countries to ensure the overall national herd vaccination coverage, biocontainment when outbreaks occur, and strict biosecurity control of animal movement between countries. Sustained commitments from governments, cooperative diplomatic relationships, and public awareness campaigns are critical to FMD control, to ensure collaboration among veterinarians, traders and farmers throughout Southeast Asia (SEA). Recently, highly pathogenic porcine reproductive and respiratory syndrome (HP‐PRRS) and porcine epidemic diarrhoea (PED) spread from China to Southeast Asian countries, causing major economic losses. Foot and mouth disease, HP‐PRRS, and PED currently remain endemic and may continue to sporadically re‐emerge, owing to inadequate public health management and/or biosecurity failures. Therefore, the risk factors must be identified to better understand the epidemiology of these diseases in an effort to develop effective control measures. International coordination through the establishment of a collaborative network supported by the World Organization for Animal Health (OIE) and the Food and Agriculture Organization (FAO) should be implemented to prevent trans‐boundary transmission among countries. This review discusses trans‐boundary swine diseases of particular importance to SEA, including FMD, HP‐PRRS and PED, with a primary focus on major factors contributing to the spread of these diseases and important control measures, reflecting the impact of globalization on disease control and surveillance.
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Affiliation(s)
- S Nuntawan Na Ayudhya
- Department of Veterinary Pathology, Faculty of Veterinary Science, Chulalongkorn University, Bangkok, 10330 Thailand
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11
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Cellular microRNA miR-26a suppresses replication of porcine reproductive and respiratory syndrome virus by activating innate antiviral immunity. Sci Rep 2015; 5:10651. [PMID: 26013676 PMCID: PMC4445041 DOI: 10.1038/srep10651] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2015] [Accepted: 04/10/2015] [Indexed: 11/23/2022] Open
Abstract
Porcine reproductive and respiratory syndrome (PRRS) has caused large economic losses in the swine industry in recent years. Current PRRS vaccines fail to effectively prevent and control this disease. Consequently, there is a need to develop new antiviral strategies. MicroRNAs play critical roles in intricate host-pathogen interaction networks, but the involvement of miRNAs during PRRS virus (PRRSV) infection is not well understood. In this study, pretreatment with miR-26a induced a significant inhibition of PRRSV replication and remission of the cytopathic effect in MARC-145 cells, and this antiviral effect was sustained for at least 120 h. Luciferase reporter analysis showed that the PRRSV genome was not the target of miRNA-26a. Instead, RNA-seq analysis demonstrated that miR-26a significantly up-regulated innate anti-viral responses, including activating the type I interferon (IFN) signaling pathway and promoting the production of IFN-stimulated genes. These findings suggest that delivery of miR-26a may provide a potential strategy for anti-PRRSV therapies.
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12
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Wang FX, Qin LT, Liu Y, Liu X, Sun N, Yang Y, Chen T, Zhu HW, Ren JQ, Sun YJ, Cheng SP, Wen YJ. Novel Nsp2 deletion based on molecular epidemiology and evolution of porcine reproductive and respiratory syndrome virus in Shandong Province from 2013 to 2014. INFECTION GENETICS AND EVOLUTION 2015; 33:219-26. [PMID: 25958135 DOI: 10.1016/j.meegid.2015.05.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2014] [Revised: 03/31/2015] [Accepted: 05/06/2015] [Indexed: 10/23/2022]
Abstract
Porcine reproductive and respiratory syndrome (PRRS) is an economically important swine disease affecting swine worldwide. In this study, a total of 385 samples were collected from Shandong pig farms during 2013 and 2014, when pigs were not inoculated with any vaccine. Results indicated that, out of 385 samples, 47 (12.21%) were PRRSV-RNA-positive. The gene sequence analysis of 12 ORF5, 12 ORF7, and 8 Nsp2 of these samples was used to determine the molecular epidemiology of PRRSV in different parts of China's Shandong Province. The phylogenetic tree based on these 3 genes indicated that the Chinese PRRSV strains could be divided into five subgroups and two large groups. The 8 study strains were clustered into subgroup IV, another 4 strains into subgroup I. The first 8 strains shared considerable homology with VR-2332 in ORF5 (96-97.5%), the other 4 strains shared considerable homology with JXA1 (94-98%). Phylogenetic tree of GP5 showed that the eight isolates formed a tightly novel clustered branch, subgroup V, which resembled but differed from isolate VR-2332. When examined using Nsp2 alone, the first 8 strains showed considerable homology with a U.S. vaccine strain, Ingelvac MLV (89.6-98.4%). One novel pattern of deletion was observed in Nsp2. The genetic diversity of genotype 2 PRRSV tended to vary in the field. The emergence of novel variants will probably be the next significant branch of PRRSV study.
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Affiliation(s)
- Feng-Xue Wang
- State Key Laboratory for Molecular Biology of Special Economic Animals, Institute of Special Economic Animals and Plants, Chinese Academy of Agricultural Sciences, Changchun, Jilin 130112, China
| | - Li-Ting Qin
- Shandong New Hope Liuhe Co., Ltd., Qingdao, Shandong 266000, China
| | - Ying Liu
- State Key Laboratory for Molecular Biology of Special Economic Animals, Institute of Special Economic Animals and Plants, Chinese Academy of Agricultural Sciences, Changchun, Jilin 130112, China
| | - Xing Liu
- State Key Laboratory for Molecular Biology of Special Economic Animals, Institute of Special Economic Animals and Plants, Chinese Academy of Agricultural Sciences, Changchun, Jilin 130112, China
| | - Na Sun
- State Key Laboratory for Molecular Biology of Special Economic Animals, Institute of Special Economic Animals and Plants, Chinese Academy of Agricultural Sciences, Changchun, Jilin 130112, China
| | - Yong Yang
- State Key Laboratory for Molecular Biology of Special Economic Animals, Institute of Special Economic Animals and Plants, Chinese Academy of Agricultural Sciences, Changchun, Jilin 130112, China
| | - Ting Chen
- Shandong New Hope Liuhe Co., Ltd., Qingdao, Shandong 266000, China
| | - Hong-Wei Zhu
- State Key Laboratory for Molecular Biology of Special Economic Animals, Institute of Special Economic Animals and Plants, Chinese Academy of Agricultural Sciences, Changchun, Jilin 130112, China
| | - Jing-Qiang Ren
- State Key Laboratory for Molecular Biology of Special Economic Animals, Institute of Special Economic Animals and Plants, Chinese Academy of Agricultural Sciences, Changchun, Jilin 130112, China
| | - Ying-Jun Sun
- Shandong New Hope Liuhe Co., Ltd., Qingdao, Shandong 266000, China
| | - Shi-Peng Cheng
- State Key Laboratory for Molecular Biology of Special Economic Animals, Institute of Special Economic Animals and Plants, Chinese Academy of Agricultural Sciences, Changchun, Jilin 130112, China
| | - Yong-Jun Wen
- State Key Laboratory for Molecular Biology of Special Economic Animals, Institute of Special Economic Animals and Plants, Chinese Academy of Agricultural Sciences, Changchun, Jilin 130112, China.
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13
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Zhu L, Song H, Zhang X, Xia X, Sun H. Inhibition of porcine reproductive and respiratory syndrome virus infection by recombinant adenovirus- and/or exosome-delivered the artificial microRNAs targeting sialoadhesin and CD163 receptors. Virol J 2014; 11:225. [PMID: 25522782 PMCID: PMC4279792 DOI: 10.1186/s12985-014-0225-9] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2014] [Accepted: 12/10/2014] [Indexed: 01/24/2023] Open
Abstract
Background The current vaccines failed to provide substantial protection against porcine reproductive and respiratory syndrome (PRRS) and the new vaccine development faces great challenges. Sialoadhesin (Sn) and CD163 are the two key receptors for PRRS virus (PRRSV) infection of porcine alveolar macrophages (PAMs), but the artificial microRNA (amiRNA) strategy targeting two viral receptors has not been described. Methods The candidate miRNAs targeting Sn or CD163 receptor were predicted using a web-based miRNA design tool and validated by transfection of cells with each amiRNA expression vector plus the reporter vector. The amiRNA-expressing recombinant adenoviruses (rAds) were generated using AdEasy Adenoviral Vector System. The rAd transduction efficiencies for pig cells were measured by flow cytometry and fluorescent microscopy. The expression and exosome-mediated secretion of amiRNAs were detected by RT-PCR. The knock-down of Sn or CD163 receptor by rAd- and/or exosome-delivered amiRNA was detected by quantitative RT-PCR and flow cytometry. The additive anti-PRRSV effect between the two amiRNAs was detected by quantitative RT-PCR and viral titration. Results All 18 amiRNAs validated were effective against Sn or CD163 receptor mRNA expression. Two rAds expressing Sn- or CD163-targeted amiRNA were generated for further study. The maximal rAd transduction efficiency was 62% for PAMs at MOI 800 or 100% for PK-15 cells at MOI 100. The sequence-specific amiRNAs were expressed efficiently in and secreted from the rAd-transduced cells via exosomes. The expression of Sn and CD163 receptors was inhibited significantly by rAd transduction and/or amiRNA-containing exosome treatment at mRNA and protein levels. Both PRRSV ORF7 copy number and viral titer were reduced significantly by transduction of PAMs with the two rAds and/or by treatment with the two amiRNA-containing exosomes. The additive anti-PRRSV effect between the two amiRNAs was relatively long-lasting (96 h) and effective against three different viral strains. Conclusion These results suggested that Sn- and CD163-targeted amiRNAs had an additive anti-PRRSV effect against different viral strains. Our findings provide new evidence supporting the hypothesis that exosomes can also serve as an efficient small RNA transfer vehicle for pig cells.
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Affiliation(s)
- Li Zhu
- College of Veterinary Medicine, Jiangsu Co-Innovation Center for Prevention and Control of Important Animal infectious Diseases and Zoonoses, Yangzhou University, Yangzhou, 225009, China.
| | - Hongqin Song
- College of Veterinary Medicine, Jiangsu Co-Innovation Center for Prevention and Control of Important Animal infectious Diseases and Zoonoses, Yangzhou University, Yangzhou, 225009, China.
| | - Xinyu Zhang
- College of Veterinary Medicine, Jiangsu Co-Innovation Center for Prevention and Control of Important Animal infectious Diseases and Zoonoses, Yangzhou University, Yangzhou, 225009, China.
| | - Xiaoli Xia
- College of Veterinary Medicine, Jiangsu Co-Innovation Center for Prevention and Control of Important Animal infectious Diseases and Zoonoses, Yangzhou University, Yangzhou, 225009, China.
| | - Huaichang Sun
- College of Veterinary Medicine, Jiangsu Co-Innovation Center for Prevention and Control of Important Animal infectious Diseases and Zoonoses, Yangzhou University, Yangzhou, 225009, China.
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Liu J, Zhang L, Zhu X, Bai J, Wang L, Wang X, Jiang P. Heat shock protein 27 is involved in PCV2 infection in PK-15 cells. Virus Res 2014; 189:235-42. [PMID: 24907481 DOI: 10.1016/j.virusres.2014.05.024] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2014] [Revised: 05/25/2014] [Accepted: 05/27/2014] [Indexed: 12/21/2022]
Abstract
Porcine circovirus type 2 (PCV2) has been identified as the etiologic agent which causing postweaning multisystemic wasting syndrome in swine farms in the world. Some quantitative proteomic studies showed that many proteins significantly changed in PCV2-infected cells. To explore the role of cellular chaperones during PCV2 infection, cytoprotective chaperone Hsp27 was analyzed in PCV2-infected PK-15 cells in this study. The results showed that Hsp27 could up-regulate and accumulate in phosphorylated forms in the nuclear zone during PCV2 replication. Suppression of Hsp27 phosphorylation with specific chemical inhibitors or downregulation of all forms of Hsp27 via RNA interference significantly reduced the virus replication. Meanwhile, over-expression of Hsp27 enhanced PCV2 genome replication and virion production. It indicated that Hsp27 was required for PCV2 production in PK-15 cells culture. It should be helpful for understanding the mechanism of replication and pathogenesis of PCV2 and development of novel antiviral therapies in the future.
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Affiliation(s)
- Jie Liu
- Key Laboratory of Animal Diseases Diagnostic and Immunology, Ministry of Agriculture, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China
| | - Lili Zhang
- Key Laboratory of Animal Diseases Diagnostic and Immunology, Ministry of Agriculture, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China
| | - Xuejiao Zhu
- Key Laboratory of Animal Diseases Diagnostic and Immunology, Ministry of Agriculture, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China
| | - Juan Bai
- Key Laboratory of Animal Diseases Diagnostic and Immunology, Ministry of Agriculture, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China
| | - Liming Wang
- Key Laboratory of Animal Diseases Diagnostic and Immunology, Ministry of Agriculture, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China
| | - Xianwei Wang
- Key Laboratory of Animal Diseases Diagnostic and Immunology, Ministry of Agriculture, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China
| | - Ping Jiang
- Key Laboratory of Animal Diseases Diagnostic and Immunology, Ministry of Agriculture, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China.
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A new porcine reproductive and respiratory syndrome virus strain with highly conserved molecular characteristics in its parental and attenuated strains. Virus Genes 2014; 49:259-68. [PMID: 24859421 DOI: 10.1007/s11262-014-1086-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2013] [Accepted: 05/07/2014] [Indexed: 10/25/2022]
Abstract
Porcine reproductive and respiratory syndrome virus (PRRSV) causes substantial economic losses to many swine-producing regions. In this study, PRRSV strain NT0801-F80 was derived from its parental isolate NT0801 by 80 passages in Marc-145 cells. Experimental infection of piglets clearly demonstrated that strain NT0801-F80 is less virulent than NT0801. However, whole genome sequencing showed that the genomes of the parental and attenuated strains are highly conserved compared with those of four other pairs of virulent parental/attenuated vaccine strains (VR2332 and RespPRRS MLV, JA142 and Ingelvac(®) ATP MLV, CH-1a and CH-1R, and JXA1 and JXAR). The attenuated strain NT0801-F80 has only 21 nucleotide changes, producing only 14 amino acid changes in NSP2, GP2, GP3, and GP5, compared with those aa sequences of the virulent parental strain. These mutated aa in the attenuated virus may be involved in virulence. These data provide valuable information on the attenuation mechanism of PRRSV that should be useful in future research.
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Chen Y, Guo R, He S, Zhang X, Xia X, Sun H. Additive inhibition of porcine reproductive and respiratory syndrome virus infection with the soluble sialoadhesin and CD163 receptors. Virus Res 2014; 179:85-92. [DOI: 10.1016/j.virusres.2013.11.008] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2013] [Revised: 11/06/2013] [Accepted: 11/07/2013] [Indexed: 12/12/2022]
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RNAi-based inhibition of porcine reproductive and respiratory syndrome virus replication in transgenic pigs. J Biotechnol 2013; 171:17-24. [PMID: 24333125 PMCID: PMC7127135 DOI: 10.1016/j.jbiotec.2013.11.022] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2013] [Revised: 11/22/2013] [Accepted: 11/26/2013] [Indexed: 11/25/2022]
Abstract
We generated transgenic pig expressing PRRSV-specific siRNA. Stability of siRNA expression was proved in two generations. Type I interferon was not elicited by the expression of siRNA in vivo. We proved that transgenic pigs showed substantially decreased virus load in serum after PRRSV infection.
Porcine reproductive and respiratory syndrome (PRRS) is an economically devastating viral disease causing heavy losses to the swine industry worldwide. Many studies have shown that transient delivery of small interfering RNA (siRNA) or adenovirus-mediated RNA interfere (RNAi) could potentially inhibit porcine reproductive and respiratory syndrome virus (PRRSV) replication in vivo and in vitro. Here, we applied RNAi to produce transgenic (TG) pigs that constitutively expressed PRRSV-specific siRNA derived from small hairpin RNA (shRNA). First, we evaluated siRNA expression in the founding and F1 generation pigs and confirmed stable transmission. Then, we detected the expression of IFN-β and protein kinase R (PKR) and found no difference among TG, non-transgenic (NTG), and wild-type pigs. Lastly, the F1 generation pigs, including TG and NTG piglets, were challenged with 3 × 104.5 TCID50 of JXA1, a highly pathogenic porcine reproductive and respiratory syndrome virus (HP-PRRSV). Our results showed that the in vivo siRNA expression substantially reduced the serum HP-PRRSV titers and increased survival time by 3 days when TG pigs were compared with the NTG controls. These data suggested that RNAi-based genetic modification might be used to breed viral-resistant livestock with stable siRNA expression with no complications of siRNA toxicity.
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Liu J, Bai J, Zhang L, Jiang Z, Wang X, Li Y, Jiang P. Hsp70 positively regulates porcine circovirus type 2 replication in vitro. Virology 2013; 447:52-62. [PMID: 24210099 DOI: 10.1016/j.virol.2013.08.025] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2013] [Revised: 07/26/2013] [Accepted: 08/22/2013] [Indexed: 12/20/2022]
Abstract
The Hsp70 chaperone plays a central role in multiple processes within cells. Porcine circovirus type 2 (PCV2) is the essential causal agent of post-weaning multisystemic wasting syndrome (PMWS), which has spread worldwide. But the mechanism of PCV2 replication remains poorly understood. In this study, we firstly found the positive effect of heat stress on the replication of PCV2 in the continuous porcine monocytic cell line 3D4/31. Downregulation of Hsp70 by the specific chaperone inhibitor Quercetin or RNA interference and upregulation of Hsp70 by expression from a recombinant adenovirus showed that Hsp70 enhanced PCV2 genome replication and virion production. A specific interaction between Hsp70 and PCV2 Cap was confirmed by colocalization by confocal microscopy and co-immunoprecipitation. Furthermore, the NF-κB pathway was activated and caspase-3 activity was reduced when Hsp70 was overexpressed in PCV2-infected 3D4/31 cells. These data suggested that Hsp70 positively regulated PCV2 replication, which being helpful for understanding the molecular mechanism of PCV2 infection.
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Affiliation(s)
- Jie Liu
- Key Laboratory of Animal Diseases Diagnostic and Immunology, Ministry of Agriculture, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, Jiangsu 210095, China
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Hao X, Shen Z, Wang J, Zhang Q, Li B, Wang C, Cao W. In vitro inactivation of porcine reproductive and respiratory syndrome virus and pseudorabies virus by slightly acidic electrolyzed water. Vet J 2013; 197:297-301. [DOI: 10.1016/j.tvjl.2013.02.007] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2012] [Revised: 01/08/2013] [Accepted: 02/05/2013] [Indexed: 11/29/2022]
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Zhang L, Liu J, Bai J, Du Y, Wang X, Liu X, Jiang P. Poly(I:C) inhibits porcine reproductive and respiratory syndrome virus replication in MARC-145 cells via activation of IFIT3. Antiviral Res 2013; 99:197-206. [PMID: 23791982 DOI: 10.1016/j.antiviral.2013.06.004] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2013] [Revised: 06/08/2013] [Accepted: 06/10/2013] [Indexed: 10/26/2022]
Abstract
Porcine reproductive and respiratory syndrome virus (PRRSV) is a major cause of heavy economic losses in many swine-producing regions. Current vaccination strategies and antiviral drugs provide only limited protection. Interferon (IFN)-induced protein with tetratricopeptide repeats 3 (IFIT3) has been characterized as the product of a novel antiviral gene and as an important modulator in innate immunity. However, the role of IFIT3 in PRRSV infection is scarcely understood. In this study, polyinosinic-polycytidylic acid (poly(I:C)) inhibited PRRSV replication in MARC-145 cells, following the appearance of increased IFIT3. Overexpression of porcine IFIT3 resulted in a decrease of PRRSV. Knockdown of IFIT3 in MARC-145 cells increased PRRSV replication and impaired the antiviral activity mediated by poly(I:C). Moreover, in the presence or absence of IFIT3, poly(I:C)-induced IFN-β promoter activity was significantly boosted or crippled, respectively. IFIT3, TBK1 and phosphorylation of IRF3 were activated in poly(I:C)-transfected MARC-145 cells. It demonstrated that IFIT3 plays an important role in IFN-β induction in MARC-145 cells, and, when activated, it can inhibit PRRSV replication.
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Affiliation(s)
- Lili Zhang
- Key Laboratory of Animal Diseases Diagnostic and Immunology, Ministry of Agriculture, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China
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21
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Zhang L, Liu J, Bai J, Wang X, Li Y, Jiang P. Comparative expression of Toll-like receptors and inflammatory cytokines in pigs infected with different virulent porcine reproductive and respiratory syndrome virus isolates. Virol J 2013; 10:135. [PMID: 23631691 PMCID: PMC3673858 DOI: 10.1186/1743-422x-10-135] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2012] [Accepted: 04/18/2013] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Porcine reproductive and respiratory syndrome virus (PRRSV) is largely responsible for heavy economic losses in the swine industry worldwide because of its high mutation rate and subsequent emergence of virulent strains. However, the immunological and pathological responses of pigs to PRRSV strains with different virulence have not been completely elucidated. METHODS Twenty-four piglets were divided into 4 groups (n = 6 each) and inoculated with highly pathogenic PRRSV isolate BB0907 (HP), low pathogenic PRRSV NT0801 (LP), LP derivative strain NT0801-F70 (LP-der), and DMEM medium (control), respectively. The changes in TLR2, 3, 7, and 8 gene expression and TNF-α, IL-1β, IL-6, IFN-γ, and IL-10 secretion were evaluated using real-time PCR and ELISA at 6, 9, and 15 days post inoculation (d.p.i.). The cytokine levels were evaluated in the supernatants of porcine alveolar macrophages (PAMs) and peripheral blood mononuclear cells (PBMCs) following stimulation with LTA, poly(I:C), CL097, and PRRSV individually. RESULTS HP caused more severe clinical signs and pathological lesions in swine than LP and LP-der had almost no virulence compared with LP. The serum levels of IL-1β, IL-6, TNF-α, and IFN-γ were increased in HP-infected piglets, which were greater than in those infected with LP or LP-der. The mRNA levels of TLR3, 7, and 8 were significantly up-regulated in PAMs in HP-infected pigs compared to those in groups LP and LP-der. Furthermore, TNF-α and IL-1β secretion in PAMs from group LP was statistically greater than those from the control group after stimulation with either poly(I:C) or CL097. Meanwhile, TNF-α, IL-1β, and IL-6 levels in CL097-stimulated PBMCs from HP-infected pigs were markedly higher than those from the LP- and LP-der-infected groups. CONCLUSIONS We found that HP was a stronger inducer of TLR 3, 7, and 8 expression and IL-1β, IL-6, TNF-α, and IFN-γ production compared to LP and LP-der. HP enhanced production of TNF-α, IL-1β, and IL-6 in PBMCs following CL097-stimulation more than LP and LP-der, whereas LP enhanced the secretion of TNF-α and IL-1β in poly(I:C)- and CL097-stimulated PAMs. Our data regarding cellular reactivity to different isolates should be useful in the development of more efficacious vaccines.
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Zhang L, Bai J, Liu J, Wang X, Li Y, Jiang P. Toll-like receptor ligands enhance the protective effects of vaccination against porcine reproductive and respiratory syndrome virus in swine. Vet Microbiol 2013; 164:253-60. [PMID: 23523335 DOI: 10.1016/j.vetmic.2013.02.016] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2012] [Revised: 02/05/2013] [Accepted: 02/15/2013] [Indexed: 01/11/2023]
Abstract
Porcine reproductive and respiratory syndrome virus (PRRSV) is mainly responsible for the heavy economic losses in pig industry in the world. Current vaccination strategies provide only a limited protection. Previous studies have demonstrated the immunostimulatory adjuvant effects of Toll-like receptor (TLR) ligands, synthetic double-stranded RNA polyriboinosinic polyribocytidylic [poly(I:C)], lipoteichoic acid (LTA) and CL097 in humans and animals. To study the effects of these compounds on the induction of PRRSV-specific immune responses, mice were immunized subcutaneously with killed virus (KV) antigens incorporating pairs of TLR ligands. It was found that poly(I:C) and CL097 induced the higher IFN-γ levels and PRRSV-specific antibodies, comparing with that KV with or without LTA in mice. Piglets were vaccinated with the KV mixed with poly(I:C) or CL097 and the protective effects of the vaccination were evaluated. The results showed that PRRSV-specific antibodies and T lymphocyte proliferation levels in KV mixed with poly(I:C) or CL097 groups were higher than those in KV group. Following challenge with PRRSV, pigs inoculated with KV mixed with poly(I:C) or CL097 showed lighter clinical signs, lower viremia and less pathological lesion of lungs, as compared to those of KV and challenge control groups. It indicated that co-administration of poly(I:C) and CL097 with killed PRRSV vaccine conferred higher protection against PRRSV challenge. TLR3 and TLR7/8 ligands are promising adjuvant candidates for the development of novel vaccines against PRRSV.
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Affiliation(s)
- Lili Zhang
- Key Laboratory of Animal Diseases Diagnostic and Immunology, Ministry of Agriculture, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China
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Bai J, Jiang K, Zhang L, Wang X, Wang X, Li Y, Jiang P. Protective efficacy of adenovirus-mediated small interfering RNAs against encephalomyocarditis virus challenge in mice. J Virol Methods 2012; 185:204-12. [DOI: 10.1016/j.jviromet.2012.07.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2012] [Revised: 06/26/2012] [Accepted: 07/03/2012] [Indexed: 10/28/2022]
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Daniel-Carlier N, Sawafta A, Passet B, Thépot D, Leroux-Coyau M, Lefèvre F, Houdebine LM, Jolivet G. Viral infection resistance conferred on mice by siRNA transgenesis. Transgenic Res 2012; 22:489-500. [PMID: 22961198 DOI: 10.1007/s11248-012-9649-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2012] [Accepted: 08/28/2012] [Indexed: 11/25/2022]
Abstract
RNA interference is an attractive strategy to fight against viral diseases by targeting the mRNA of viral genes. Most studies have reported the transient delivery of small interfering RNA or small hairpin (shRNA) expression constructs. Here, we present the production of transgenic mice stably expressing shRNA or miRNA targeting the IE180 mRNA (immediate early gene) of the pseudorabies virus (PRV) which infects mice and farm animals. We firstly designed non-retroviral shRNA or miRNA expression vectors. Secondly, we selected the most efficient shRNA construct that targeted either the 5'part or 3'UTR of the IE mRNA and was able to knockdown the target gene expression in cultured cells, by measuring systematically the shRNA content and comparing this with the interfering effects. We then produced four lines of transgenic mice expressing different amounts of shRNA or miRNA in the brain but without signs of stimulation of innate immunity. Lastly, we tested their resistance to PRV infection. In all transgenic lines, we observed a significant resistance to viral challenge, the best being achieved with the shRNA construct targeting the 3'UTR of the IE gene. Viral DNA levels in the brains of infected mice were always lower in transgenic mice, even in animals that did not survive. Finally, this work reports an effective strategy to generate transgenic animals producing shRNA from non-retroviral expression vectors. Moreover, these mice are the first transgenic animal models producing shRNA with a significant antiviral effect but without any apparent shRNA toxicity.
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Efficient inhibition of porcine reproductive and respiratory syndrome virus replication by artificial microRNAs targeting the untranslated regions. Arch Virol 2012; 158:55-61. [DOI: 10.1007/s00705-012-1455-z] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2012] [Accepted: 07/14/2012] [Indexed: 10/27/2022]
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Interaction between innate immunity and porcine reproductive and respiratory syndrome virus. Anim Health Res Rev 2012; 12:149-67. [PMID: 22152291 DOI: 10.1017/s1466252311000144] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Innate immunity provides frontline antiviral protection and bridges adaptive immunity against virus infections. However, viruses can evade innate immune surveillance potentially causing chronic infections that may lead to pandemic diseases. Porcine reproductive and respiratory syndrome virus (PRRSV) is an example of an animal virus that has developed diverse mechanisms to evade porcine antiviral immune responses. Two decades after its discovery, PRRSV is still one of the most globally devastating viruses threatening the swine industry. In this review, we discuss the molecular and cellular composition of the mammalian innate antiviral immune system with emphasis on the porcine system. In particular, we focus on the interaction between PRRSV and porcine innate immunity at cellular and molecular levels. Strategies for targeting innate immune components and other host metabolic factors to induce ideal anti-PRRSV protection are also discussed.
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Xiao S, Wang Q, Gao J, Wang L, He Z, Mo D, Liu X, Chen Y. Inhibition of highly pathogenic PRRSV replication in MARC-145 cells by artificial microRNAs. Virol J 2011; 8:491. [PMID: 22040357 PMCID: PMC3215188 DOI: 10.1186/1743-422x-8-491] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2011] [Accepted: 11/01/2011] [Indexed: 11/20/2022] Open
Abstract
Background Highly pathogenic porcine reproductive and respiratory syndrome (HP-PRRS) has caused large economic losses in swine industry in recent years. However, current antiviral strategy could not effectively prevent and control this disease. In this research, five artificial microRNAs (amiRNAs) respectively targeted towards ORF5 (amirGP5-243, -370) and ORF6 (amirM-82, -217,-263) were designed and incorporated into a miRNA-based vector that mimics the backbone of murine miR-155 and permits high expression of amiRNAs in a GFP fused form mediated by RNA Pol II promoter CMV. Results It was found that amirGP5-370 could effectively inhibit H-PRRSV replication. The amirM-263-M-263, which was a dual pre-amiRNA expression cassette where two amirM-263s were chained, showed stronger virus inhibitory effects than single amirM-263. H-PRRSV replication was inhibited up to 120 hours in the MARC-145 cells which were stably transduced by recombinant lentiviruses (Lenti-amirGP5-370, -amirM-263-M-263). Additionally, efficacious dose of amirGP5-370 and amirM-263 expression did not trigger the innate interferon response. Conclusions Our study is the first attempt to suppress H-PRRSV replication in MARC-145 cells through vector-based and lentiviral mediated amiRNAs targeting GP5 or M proteins coding sequences of PRRSV, which indicated that artificial microRNAs and recombinant lentiviruses might be applied to be a new potent anti-PRRSV strategy.
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Affiliation(s)
- Shuqi Xiao
- State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou 510006, P. R. China
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Li J, Dai Y, Liu S, Guo H, Wang T, Ouyang H, Tu C. In vitro inhibition of CSFV replication by multiple siRNA expression. Antiviral Res 2011; 91:209-16. [PMID: 21699919 PMCID: PMC7114328 DOI: 10.1016/j.antiviral.2011.06.005] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2011] [Revised: 05/24/2011] [Accepted: 06/01/2011] [Indexed: 01/24/2023]
Abstract
Classical swine fever (CSF) is a highly contagious viral disease of pigs which causes major economic losses worldwide. No specific drug is currently available for the effective treatment of CSFV infection; however, RNA interference (RNAi) has been applied successfully to inhibit the replication of human and other animal viruses. In this study, three effective siRNAs targeting NS3 of CSFV were selected. siNS3-2 targeting NS3 gene was chosen for further experimentation, while siN1 and siN2 targeting Npro gene, and siNS5B targeting NS5B gene describe previously. Single, double and quadruple anti-CSFV siRNA expression plasmids, with loxp sites at each end of the selectable marker genes, were constructed and analyzed using the same promoters or four different promoters, targeting Npro, NS3 and NS5B genes of CSFV. Results indicate that single or multiple siRNA expression plasmids can efficiently inhibit CSFV replication and that inhibition was markedly stronger when multiple siRNAs were expressed targeting different genes of CSFV. Since RNAi applied to anti-CSFV research, this study provides anti-CSFV methods by single and multiple siRNA expression which can target most viral isolates of different subtypes and prevent viral escape. It also provides a basis for development of CSFV-resistant transgenic pigs.
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Affiliation(s)
- Jiangnan Li
- Institute of Veterinary Sciences, Academy of Military Medical Sciences, 666 Liuying West Road, Changchun 130122, China
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Lan Y, Lu H, Zhao K, He W, Chen K, Wang G, Song D, Gao F. In vitro inhibition of porcine hemagglutinating encephalomyelitis virus replication with siRNAs targeting the spike glycoprotein and replicase polyprotein genes. Intervirology 2011; 55:53-61. [PMID: 21372550 PMCID: PMC7179546 DOI: 10.1159/000323523] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2010] [Accepted: 11/24/2010] [Indexed: 12/22/2022] Open
Abstract
Objective The specific effect of RNA interference on the replication of porcine hemagglutinating encephalomyelitis virus (PHE-CoV) was explored. Methods Four species of small interfering RNA (siRNA), targeting different regions of the PHE-CoV spike glycoprotein and replicase polyprotein genes, were prepared by in vitro transcription. After transfection of PK-15 cells with each of the siRNAs followed by infection with PHE-CoV, the cytopathic effect (CPE) was examined by phase-contrast microscope, and viral proliferation within cells was examined by indirect immunofluorescence microscopy, hemagglutination (HA) test, TCID50 assay and real-time RT-PCR. Results Examination of CPE demonstrated that the four siRNAs were capable of protecting cells against PHE-CoV invasion with very high specificity and efficiency. At 48 h post-infection, only a few siRNA-treated cells were positive for viral antigen staining, whereas most untreated virus-infected cells were positive. Transfection with siRNAs also suppressed the production of infectious virus by up to 18- to 32-fold as assessed by a HA test and 93- to 494-fold as assessed by TCID50 assay. Furthermore, treatment with siRNAs caused a 53-91% reduction in the viral genome copy number as assessed by real-time RT-PCR. Conclusion These results suggested that the four species of siRNAs can efficiently inhibit PHE-CoV genome replication and infectious virus production.
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Affiliation(s)
- Yungang Lan
- College of Animal Science and Veterinary Medicine, Jilin University, Changchun, China
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Thanawongnuwech R, Suradhat S. Taming PRRSV: revisiting the control strategies and vaccine design. Virus Res 2010; 154:133-40. [PMID: 20851723 DOI: 10.1016/j.virusres.2010.09.003] [Citation(s) in RCA: 72] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2010] [Revised: 09/03/2010] [Accepted: 09/06/2010] [Indexed: 02/06/2023]
Abstract
Porcine reproductive and respiratory syndrome virus (PRRSV) continues to be a threat, causing economically significant impacts on the swine industry worldwide. In this article, we share the information related to the Thai PRRSV and review the available options for PRRS control strategies. Unfortunately, the traditional control strategies and conventional vaccines fail to provide sustainable disease control, as they suffer from both antigenic heterogeneity and various immune evasion strategies of PRRSV. Induction of interleukin (IL)-10 following PRRSV infection is believed to be a focal mechanism leading to the unique immunological outcomes and interference of PRRS vaccine efficacy. It is likely that the nucleocapsid protein plays an important role in induction of IL-10 following PRRSV infection. We propose that removal or reduction of the PRRSV-induced, negative immunomodulatory effects especially during the first 2 weeks following infection is essential to establish proper anti-PRRSV immunity. In other word, incorporation of the "taming strategy" will be needed to reduce PRRSV-induced immunomodulatory effects, and to ensure maximal vaccine-induced immunity in the face of viral exposure. Any PRRSV vaccine that can induce cross-protective immunity and simultaneously eliminate the immunoinhibitory effects of PRRSV would be ideal. In addition, tracking of the inhibitory parameters, following the PRRSV challenge should be included in the vaccine testing protocol. Therefore, the future of PRRSV vaccine development relies tremendously on the basic knowledge of host-virus interactions and the communication between the basic and clinical PRRSV research fields.
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Affiliation(s)
- Roongroje Thanawongnuwech
- Department of Veterinary Pathology, Faculty of Veterinary Science, Chulalongkorn University, Henri-Dunant Rd., Pathumwan, Bangkok 10330, Thailand
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Long CR, Tessanne KJ, Golding MC. Applications of RNA interference-based gene silencing in animal agriculture. Reprod Fertil Dev 2010; 22:47-58. [DOI: 10.1071/rd09211] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Classical genetic selection, recently aided by genomic selection tools, has been successful in achieving remarkable progress in livestock improvement. However, genetic selection has led to decreased genetic diversity and, in some cases, acquisition of undesirable traits. In order to meet the increased demands of our expanding population, new technologies and practices must be developed that contend with zoonotic and animal disease, environmental impacts of large farming operations and the increased food and fibre production needed to feed and clothe our society. Future increases in productivity may be dependent upon the acquisition of genetic traits not currently encoded by the genomes of animals used in standard agricultural practice, thus making classical genetic selection impossible. Genetic engineering of livestock is commonly used to produce pharmaceuticals or to impart enhanced production characteristics to animals, but has also demonstrated its usefulness in producing animals with disease resistance. However, significant challenges remain because it has been more difficult to produce animals in which specific genes have been removed. It is now possible to modify livestock genomes to block expression of endogenous and exogenous genes (such as those expressed following virus infection). In the present review, we discuss mechanisms of silencing gene expression via the biology of RNA interference (RNAi), the technology of activating the RNAi pathway and the application of this technology to enhance livestock production through increased production efficiency and prevention of disease. An increased demand for sustainable food production is at the forefront of scientific challenges and RNAi technology will undoubtedly play a key role.
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