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Li S, Qiu M, Li S, Li C, Lin H, Qiu Y, Qi W, Feng B, Cui M, Yang S, Zheng W, Shang S, Tian K, Zhu J, Lu Y, Chen N. A chimeric porcine reproductive and respiratory syndrome virus 1 strain containing synthetic ORF2-6 genes can trigger T follicular helper cell and heterologous neutralizing antibody responses and confer enhanced cross-protection. Vet Res 2024; 55:28. [PMID: 38449049 PMCID: PMC10918997 DOI: 10.1186/s13567-024-01280-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2023] [Accepted: 01/24/2024] [Indexed: 03/08/2024] Open
Abstract
The prevalence of porcine reproductive and respiratory syndrome virus 1 (PRRSV1) isolates has continued to increase in Chinese swine herds in recent years. However, no effective control strategy is available for PRRSV1 infection in China. In this study, we generated the first infectious cDNA clone (rHLJB1) of a Chinese PRRSV1 isolate and subsequently used it as a backbone to construct an ORF2-6 chimeric virus (ORF2-6-CON). This virus contained a synthesized consensus sequence of the PRRSV1 ORF2-6 gene encoding all the envelope proteins. The ORF2-6 consensus sequence shared > 90% nucleotide similarity with four representative strains (Amervac, BJEU06-1, HKEU16 and NMEU09-1) of PRRSV1 in China. ORF2-6-CON had replication efficacy similar to that of the backbone rHLJB1 virus in primary alveolar macrophages (PAMs) and exhibited cell tropism in Marc-145 cells. Piglet inoculation and challenge studies indicated that ORF2-6-CON is not pathogenic to piglets and can induce enhanced cross-protection against a heterologous SD1291 isolate. Notably, ORF2-6-CON inoculation induced higher levels of heterologous neutralizing antibodies (nAbs) against SD1291 than rHLJB1 inoculation, which was concurrent with a higher percentage of T follicular helper (Tfh) cells in tracheobronchial lymph nodes (TBLNs), providing the first clue that porcine Tfh cells are correlated with heterologous PRRSV nAb responses. The number of SD1291-strain-specific IFNγ-secreting cells was similar in ORF2-6-CON-inoculated and rHLJB1-inoculated pigs. Overall, our findings support that the Marc-145-adapted ORF2-6-CON can trigger Tfh cell and heterologous nAb responses to confer improved cross-protection and may serve as a candidate strain for the development of a cross-protective PRRSV1 vaccine.
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Affiliation(s)
- Shubin Li
- College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, China
| | - Ming Qiu
- College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, China
| | - Shuai Li
- College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, China
| | - Chen Li
- College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, China
| | - Hong Lin
- College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, China
| | - Yuejia Qiu
- College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, China
| | - Wenhao Qi
- College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, China
| | - Binghui Feng
- College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, China
| | - Meng Cui
- College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, China
| | - Shuai Yang
- College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, China
| | - Wanglong Zheng
- College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, China
| | - Shaobin Shang
- College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, China
| | - Kegong Tian
- National Research Center for Veterinary Medicine, Luoyang, 471000, China
| | - Jianzhong Zhu
- College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, China.
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, Yangzhou, 225009, China.
- Comparative Medicine Research Institute, Yangzhou University, Yangzhou, 225009, China.
| | - Yu Lu
- GuoTai (Taizhou) Center of Technology Innovation for Veterinary Biologicals, Taizhou, 225300, China.
| | - Nanhua Chen
- College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, China.
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, Yangzhou, 225009, China.
- International Research Laboratory of Prevention and Control of Important Animal Infectious Diseases and Zoonotic Diseases of Jiangsu Higher Education Institutions, Yangzhou, 225009, China.
- Comparative Medicine Research Institute, Yangzhou University, Yangzhou, 225009, China.
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou, 225009, China.
- Key Laboratory of Animal Pathogen Infection and Immunology of Fujian Province, Fuzhou, 350002, China.
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Li C, Li S, Li S, Qiu M, Lin H, Sun Z, Qiu Y, Qi W, Feng B, Li J, Zheng W, Yu X, Tian K, Shang S, Fan K, Zhu J, Chen N. Efficacy of a porcine reproductive and respiratory syndrome virus 1 (PRRSV-1) natural recombinant against a heterologous PRRSV-1 isolate both clustered within the subgroup of BJEU06-1-like isolates. Vet Microbiol 2023; 285:109847. [PMID: 37625255 DOI: 10.1016/j.vetmic.2023.109847] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2023] [Revised: 08/07/2023] [Accepted: 08/10/2023] [Indexed: 08/27/2023]
Abstract
Porcine reproductive and respiratory syndrome virus 1 (PRRSV-1) has been prevalent in more than 20 provinces of China. However, no PRRSV-1-specific vaccine is commercially available in China. To evaluate the feasibility of using a low virulent PRRSV-1 isolate against potential outbreaks caused by virulent Chinese PRRSV-1 isolates, here we evaluated the efficacy of a low virulent PRRSV-1 HLJB1 strain isolated in 2014 as live vaccine against a virulent PRRSV-1 SD1291 strain isolated in 2022. Genome-based phylogenetic analysis showed that both HLJB1 and SD1291 were grouped within BJEU06-1-like isolates. However, they shared only 85.27% genomic similarity. Piglet inoculation and challenge study showed that HLJB1 inoculation could reduce viremia but did not significantly alleviate clinical signs and tissue lesions. Virus neutralization test indicated that HLJB1 inoculation could induce homologous neutralizing antibodies (NAbs) but no heterologous NAbs at 42 dpi. In addition, flow cytometric analyses showed that no memory T follicular helper (Tfh) cells against SD1291 and SD1291-specific IFN-γ secreting cells were induced by HLJB1 pre-inoculation. These results supported that HLJB1 inoculation only provides partial cross-protection against SD1291 infection even though they are clustered within the same PRRSV-1 subgroup, which is closely related to the failure in conferring cross-protective adaptive immune responses.
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Affiliation(s)
- Chen Li
- College of Veterinary Medicine, Yangzhou University, Yangzhou 225009, China
| | - Shuai Li
- College of Veterinary Medicine, Yangzhou University, Yangzhou 225009, China
| | - Shubin Li
- College of Veterinary Medicine, Yangzhou University, Yangzhou 225009, China
| | - Ming Qiu
- College of Veterinary Medicine, Yangzhou University, Yangzhou 225009, China
| | - Hong Lin
- College of Veterinary Medicine, Yangzhou University, Yangzhou 225009, China
| | - Zhe Sun
- National Research Center for Veterinary Medicine, Luoyang 471000, China
| | - Yuejia Qiu
- College of Veterinary Medicine, Yangzhou University, Yangzhou 225009, China
| | - Wenhao Qi
- College of Veterinary Medicine, Yangzhou University, Yangzhou 225009, China
| | - Binghui Feng
- College of Veterinary Medicine, Yangzhou University, Yangzhou 225009, China
| | - Jixiang Li
- College of Veterinary Medicine, Yangzhou University, Yangzhou 225009, China
| | - Wanglong Zheng
- College of Veterinary Medicine, Yangzhou University, Yangzhou 225009, China; Joint International Research Laboratory of Agriculture and Agri-Product Safety, Yangzhou 225009, China
| | - Xiuling Yu
- National Research Center for Veterinary Medicine, Luoyang 471000, China
| | - Kegong Tian
- National Research Center for Veterinary Medicine, Luoyang 471000, China
| | - Shaobin Shang
- College of Veterinary Medicine, Yangzhou University, Yangzhou 225009, China
| | - Kewei Fan
- Longyan University and Fujian Provincial Key Laboratory for Prevention and Control of Animal Infectious Diseases and Biotechnology, Longyan 364012, China
| | - Jianzhong Zhu
- College of Veterinary Medicine, Yangzhou University, Yangzhou 225009, China; Joint International Research Laboratory of Agriculture and Agri-Product Safety, Yangzhou 225009, China
| | - Nanhua Chen
- College of Veterinary Medicine, Yangzhou University, Yangzhou 225009, China; Joint International Research Laboratory of Agriculture and Agri-Product Safety, Yangzhou 225009, China; International Research Laboratory of Prevention and Control of Important Animal Infectious Diseases and Zoonotic Diseases of Jiangsu Higher Education Institutions, Yangzhou 225009, China; Comparative Medicine Research Institute, Yangzhou University, Yangzhou 225009, China; Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou 225009, China; Key Laboratory of animal pathogen infection and Immunology of Fujian Province, Fuzhou 350002, China.
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Kick AR, Grete AF, Crisci E, Almond GW, Käser T. Testable Candidate Immune Correlates of Protection for Porcine Reproductive and Respiratory Syndrome Virus Vaccination. Vaccines (Basel) 2023; 11:vaccines11030594. [PMID: 36992179 DOI: 10.3390/vaccines11030594] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2023] [Revised: 02/26/2023] [Accepted: 02/26/2023] [Indexed: 03/08/2023] Open
Abstract
Porcine reproductive and respiratory syndrome virus (PRRSV) is an on-going problem for the worldwide pig industry. Commercial and experimental vaccinations often demonstrate reduced pathology and improved growth performance; however, specific immune correlates of protection (CoP) for PRRSV vaccination have not been quantified or even definitively postulated: proposing CoP for evaluation during vaccination and challenge studies will benefit our collective efforts towards achieving protective immunity. Applying the breadth of work on human diseases and CoP to PRRSV research, we advocate four hypotheses for peer review and evaluation as appropriate testable CoP: (i) effective class-switching to systemic IgG and mucosal IgA neutralizing antibodies is required for protective immunity; (ii) vaccination should induce virus-specific peripheral blood CD4+ T-cell proliferation and IFN-γ production with central memory and effector memory phenotypes; cytotoxic T-lymphocytes (CTL) proliferation and IFN-γ production with a CCR7- phenotype that should migrate to the lung; (iii) nursery, finishing, and adult pigs will have different CoP; (iv) neutralizing antibodies provide protection and are rather strain specific; T cells confer disease prevention/reduction and possess greater heterologous recognition. We believe proposing these four CoP for PRRSV can direct future vaccine design and improve vaccine candidate evaluation.
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Affiliation(s)
- Andrew R Kick
- Department of Population Health and Pathobiology, College of Veterinary Medicine, North Carolina State University, Raleigh, NC 27607, USA
- Department of Chemistry & Life Science, United States Military Academy, West Point, NY 10996, USA
| | - Alicyn F Grete
- Department of Chemistry & Life Science, United States Military Academy, West Point, NY 10996, USA
| | - Elisa Crisci
- Department of Population Health and Pathobiology, College of Veterinary Medicine, North Carolina State University, Raleigh, NC 27607, USA
| | - Glen W Almond
- Department of Population Health and Pathobiology, College of Veterinary Medicine, North Carolina State University, Raleigh, NC 27607, USA
| | - Tobias Käser
- Department of Population Health and Pathobiology, College of Veterinary Medicine, North Carolina State University, Raleigh, NC 27607, USA
- Institute of Immunology, Department of Pathobiology, University of Veterinary Medicine Vienna, 1210 Vienna, Austria
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Zhao HZ, Wang FX, Han XY, Guo H, Liu CY, Hou LN, Wang YX, Zheng H, Wang L, Wen YJ. Recent advances in the study of NADC34-like porcine reproductive and respiratory syndrome virus in China. Front Microbiol 2022; 13:950402. [PMID: 35935186 PMCID: PMC9354828 DOI: 10.3389/fmicb.2022.950402] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2022] [Accepted: 06/30/2022] [Indexed: 11/13/2022] Open
Abstract
Since porcine reproductive and respiratory syndrome virus (PRRSV) was first described in China in 1996, several genetically distinct strains of PRRSV have emerged with varying pathogenicity and severity, thereby making the prevention and control of PRRS more difficult in China and worldwide. Between 2017 and 2021, the detection rate of NADC34-like strain in China increased. To date, NADC34-like strains have spread to 10 Chinese provinces and have thus developed different degrees of pathogenicity and mortality. In this review, we summarize the history of NADC34-like strains in China and clarify the prevalence, genomic characteristics, restriction fragment length polymorphisms, recombination, pathogenicity, and vaccine status of this strain in China. In so doing, this study aims to provide a basis for the further development of prevention and control measures targeting the NADC34-like strain.
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Qiu M, Li S, Ye M, Li J, Sun Z, Li X, Xu Y, Xiao Y, Li C, Feng B, Lin H, Zheng W, Yu X, Tian K, Zhu J, Chen N. Systemic Homologous Neutralizing Antibodies Are Inadequate for the Evaluation of Vaccine Protective Efficacy against Coinfection by High Virulent PEDV and PRRSV. Microbiol Spectr 2022; 10:e0257421. [PMID: 35315711 PMCID: PMC9045284 DOI: 10.1128/spectrum.02574-21] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2021] [Accepted: 02/27/2022] [Indexed: 11/20/2022] Open
Abstract
G2 porcine epidemic diarrhea virus (G2 PEDV) and highly pathogenic porcine reproductive and respiratory syndrome virus 2 (HP-PRRSV2) are two of the most prevalent swine pathogens in China's swine herds, and their coinfection occurs commonly. Several PED and PRRS vaccines have been utilized in China for decades, and systemic homologous neutralizing antibodies (shnAbs) in serum are frequently used to evaluate the protective efficacy of PED and PRRS vaccines. To develop a vaccine candidate against G2 PEDV and HP-PRRSV2 coinfection, in this study, we generated a chimeric virus (rJSTZ1712-12-S) expressing S protein of G2 PEDV using an avirulent HP-PRRSV2 rJSTZ1712-12 infectious clone as the viral vector. The rJSTZ1712-12-S strain has similar replication efficacies as the parental rJSTZ1712-12 virus. In addition, animal inoculation indicated that rJSTZ1712-12-S is not pathogenic to piglets and can induce shnAbs against both G2 PEDV and HP-PRRSV2 isolates after prime-boost immunization. However, passive transfer study in neonatal piglets deprived of sow colostrum showed that rJSTZ1712-12-S-induced shnAbs may only decrease PEDV and PRRSV viremia but cannot confer sufficient protection against dual challenge of high virulent G2 PEDV XJ1904-34 strain and HP-PRRSV2 XJ17-5 isolate. Overall, this study provides the first evidence that shnAbs confer insufficient protection against PEDV and PRRSV coinfection and are inadequate for the evaluation of protective efficacy of PED and PRRS bivalent vaccine (especially for the PED vaccine). IMPORTANCE Porcine epidemic diarrhea virus (PEDV) and porcine reproductive and respiratory syndrome virus (PRRSV) coinfection occurs commonly and can synergistically reduce feed intake and pig growth. Vaccination is an effective strategy utilized for PED and PRRS control, and systemic homologous neutralizing antibodies (shnAbs) in serum are commonly used for protective efficacy evaluation of PED and PRRS vaccines. Currently, no commercial vaccine is available against PEDV and PRRSV coinfection. This study generated a chimeric vaccine candidate against the coinfection of prevalent PEDV and PRRSV in China. The chimeric strain can induce satisfied shnAbs against both PEDV and PRRSV after prime-boost inoculation in pigs. But the shnAbs cannot confer sufficient protection against PEDV and PRRSV coinfection in neonatal piglets. To the best of our knowledge, these findings provide the first evidence that shnAbs confer insufficient protection against PEDV and PRRSV coinfection and are inadequate for evaluating PED and PRRS bivalent vaccine protective efficacy.
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Affiliation(s)
- Ming Qiu
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, China
| | - Shubin Li
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, China
| | - Mengxue Ye
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, China
| | - Jixiang Li
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, China
| | - Zhe Sun
- National Research Center for Veterinary Medicine, Luoyang, Henan, China
| | - Xinshuai Li
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, China
| | - Yulin Xu
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, China
| | - Yanzhao Xiao
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, China
| | - Chen Li
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, China
| | - Binghui Feng
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, China
| | - Hong Lin
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, China
| | - Wanglong Zheng
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, China
| | - Xiuling Yu
- National Research Center for Veterinary Medicine, Luoyang, Henan, China
| | - Kegong Tian
- National Research Center for Veterinary Medicine, Luoyang, Henan, China
| | - Jianzhong Zhu
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, China
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, Yangzhou, Jiangsu, China
- Comparative Medicine Research Institute, Yangzhou University, Yangzhou, Jiangsu, China
- Jiangsu Key Laboratory of Zoonosis/Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, Jiangsu, China
| | - Nanhua Chen
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu, China
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, Yangzhou, Jiangsu, China
- Comparative Medicine Research Institute, Yangzhou University, Yangzhou, Jiangsu, China
- Jiangsu Key Laboratory of Zoonosis/Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, Jiangsu, China
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Jeong CG, Khatun A, Nazki S, Kim SC, Noh YH, Kang SC, Lee DU, Yang MS, Shabir N, Yoon IJ, Kim B, Kim WI. Evaluation of the Cross-Protective Efficacy of a Chimeric PRRSV Vaccine against Two Genetically Diverse PRRSV2 Field Strains in a Reproductive Model. Vaccines (Basel) 2021; 9:vaccines9111258. [PMID: 34835189 PMCID: PMC8617800 DOI: 10.3390/vaccines9111258] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2021] [Revised: 10/14/2021] [Accepted: 10/27/2021] [Indexed: 11/16/2022] Open
Abstract
Despite the routine use of porcine reproductive and respiratory syndrome (PRRS)-modified live vaccines, serious concerns are currently being raised due to their quick reversion to virulence and limited cross-protection against divergent PRRS virus (PRRSV) strains circulating in the field. Therefore, a PRRS chimeric vaccine (JB1) was produced using a DNA-launched infectious clone by replacing open reading frames (ORFs) 3–6 with those from a mixture of two genetically different PRRSV2 strains (K07–2273 and K08–1054) and ORF1a with that from a mutation-resistant PRRSV strain (RVRp22) exhibiting an attenuated phenotype. To evaluate the safety and cross-protective efficacy of JB1 in a reproductive model, eight PRRS-negative pregnant sows were purchased and divided into four groups. Four sows in two of the groups were vaccinated with JB1, and the other 4 sows were untreated at gestational day 60. At gestational day 93, one vaccinated group and one nonvaccinated group each were challenged with either K07–2273 or K08–1054. All of the sows aborted or delivered until gestation day 115 (24 days post challenge), and the newborn piglets were observed up to the 28th day after birth, which was the end of the experiment. Overall, pregnant sows of the JB1-vaccinated groups showed no meaningful viremia after vaccination and significant reductions in viremia with K07–2273 and K08–1054, exhibiting significantly higher levels of serum virus-neutralizing antibodies than non-vaccinated sows. Moreover, the JB1-vaccinated groups did not exhibit any abortion due to vaccination and showed improved piglet viability and birth weight. The piglets from JB1-vaccinated sows displayed lower viral concentrations in serum and fewer lung lesions compared with those of the piglets from the nonvaccinated sows. Therefore, JB1 is a safe and effective vaccine candidate that confers simultaneous protection against two genetically different PRRSV strains.
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Affiliation(s)
- Chang-Gi Jeong
- College of Veterinary Medicine, Jeonbuk National University, Iksan 54596, Korea; (C.-G.J.); (A.K.); (S.N.); (S.-C.K.); (M.-S.Y.); (N.S.); (B.K.)
| | - Amina Khatun
- College of Veterinary Medicine, Jeonbuk National University, Iksan 54596, Korea; (C.-G.J.); (A.K.); (S.N.); (S.-C.K.); (M.-S.Y.); (N.S.); (B.K.)
- Department of Pathology, Faculty of Animal Science and Veterinary Medicine, Sher-e-Bangla Agricultural University, Dhaka 1207, Bangladesh
| | - Salik Nazki
- College of Veterinary Medicine, Jeonbuk National University, Iksan 54596, Korea; (C.-G.J.); (A.K.); (S.N.); (S.-C.K.); (M.-S.Y.); (N.S.); (B.K.)
- The Pirbright Institute, Pirbright GU24 0NF, UK
| | - Seung-Chai Kim
- College of Veterinary Medicine, Jeonbuk National University, Iksan 54596, Korea; (C.-G.J.); (A.K.); (S.N.); (S.-C.K.); (M.-S.Y.); (N.S.); (B.K.)
| | - Yun-Hee Noh
- ChoongAng Vaccine Laboratory, Daejeon 34055, Korea; (Y.-H.N.); (D.-U.L.); (I.-J.Y.)
| | - Sang-Chul Kang
- Animal Clinical Evaluation Center, Optipharm Inc., Cheongju-si 28158, Korea;
| | - Dong-Uk Lee
- ChoongAng Vaccine Laboratory, Daejeon 34055, Korea; (Y.-H.N.); (D.-U.L.); (I.-J.Y.)
| | - Myeon-Sik Yang
- College of Veterinary Medicine, Jeonbuk National University, Iksan 54596, Korea; (C.-G.J.); (A.K.); (S.N.); (S.-C.K.); (M.-S.Y.); (N.S.); (B.K.)
| | - Nadeem Shabir
- College of Veterinary Medicine, Jeonbuk National University, Iksan 54596, Korea; (C.-G.J.); (A.K.); (S.N.); (S.-C.K.); (M.-S.Y.); (N.S.); (B.K.)
- Division of Animal Biotechnology, Faculty of Veterinary Sciences and Animal Husbandry, Sher-e-Kashmir University of Agricultural Sciences and Technology of Kashmir, Srinagar 190006, India
| | - In-Joong Yoon
- ChoongAng Vaccine Laboratory, Daejeon 34055, Korea; (Y.-H.N.); (D.-U.L.); (I.-J.Y.)
| | - Bumseok Kim
- College of Veterinary Medicine, Jeonbuk National University, Iksan 54596, Korea; (C.-G.J.); (A.K.); (S.N.); (S.-C.K.); (M.-S.Y.); (N.S.); (B.K.)
| | - Won-Il Kim
- College of Veterinary Medicine, Jeonbuk National University, Iksan 54596, Korea; (C.-G.J.); (A.K.); (S.N.); (S.-C.K.); (M.-S.Y.); (N.S.); (B.K.)
- Correspondence: ; Tel.: +82-63-270-3981
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Porcine Reproductive and Respiratory Syndrome Virus: Immune Escape and Application of Reverse Genetics in Attenuated Live Vaccine Development. Vaccines (Basel) 2021; 9:vaccines9050480. [PMID: 34068505 PMCID: PMC8150910 DOI: 10.3390/vaccines9050480] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2021] [Revised: 04/08/2021] [Accepted: 04/11/2021] [Indexed: 01/16/2023] Open
Abstract
Porcine reproductive and respiratory syndrome virus (PRRSV), an RNA virus widely prevalent in pigs, results in significant economic losses worldwide. PRRSV can escape from the host immune response in several processes. Vaccines, including modified live vaccines and inactivated vaccines, are the best available countermeasures against PRRSV infection. However, challenges still exist as the vaccines are not able to induce broad protection. The reason lies in several facts, mainly the variability of PRRSV and the complexity of the interaction between PRRSV and host immune responses, and overcoming these obstacles will require more exploration. Many novel strategies have been proposed to construct more effective vaccines against this evolving and smart virus. In this review, we will describe the mechanisms of how PRRSV induces weak and delayed immune responses, the current vaccines of PRRSV, and the strategies to develop modified live vaccines using reverse genetics systems.
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Porcine Reproductive and Respiratory Syndrome Virus Reverse Genetics and the Major Applications. Viruses 2020; 12:v12111245. [PMID: 33142752 PMCID: PMC7692847 DOI: 10.3390/v12111245] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2020] [Revised: 10/15/2020] [Accepted: 10/28/2020] [Indexed: 02/06/2023] Open
Abstract
Porcine reproductive and respiratory syndrome virus (PRRSV) is a positive sense, single-stranded RNA virus that is known to infect only pigs. The virus emerged in the late 1980s and became endemic in most swine producing countries, causing substantial economic losses to the swine industry. The first reverse genetics system for PRRSV was reported in 1998. Since then, several infectious cDNA clones for PRRSV have been constructed. The availability of these infectious cDNA clones has facilitated the genetic modifications of the viral genome at precise locations. Common approaches to manipulate the viral genome include site-directed mutagenesis, deletion of viral genes or gene fragments, insertion of foreign genes, and swapping genes between PRRSV strains or between PRRSV and other members of the Arteriviridae family. In this review, we describe the approaches to construct an infectious cDNA for PRRSV and the ten major applications of these infectious clones to study virus biology and virus–host interaction, and to design a new generation of vaccines with improved levels of safety and efficacy.
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Shabir N, Khatun A, Nazki S, Gu S, Lee SM, Hur TY, Yang MS, Kim B, Kim WI. In vitro immune responses of porcine alveolar macrophages reflect host immune responses against porcine reproductive and respiratory syndrome viruses. BMC Vet Res 2018; 14:380. [PMID: 30509265 PMCID: PMC6278023 DOI: 10.1186/s12917-018-1675-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2018] [Accepted: 10/29/2018] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Currently, an in vitro immunogenicity screening system for the immunological assessment of potential porcine reproductive and respiratory syndrome virus (PRRSV) vaccine candidates is highly desired. Thus, in the present study, two genetically divergent PRRSVs were characterized in vitro and in vivo to identify an in vitro system and immunological markers that predict the host immune response. Porcine alveolar macrophages (PAMs) and peripheral blood mononuclear cells (PBMCs) collected from PRRSV-negative pigs were used for in vitro immunological evaluation, and the response of these cells to VR2332c or JA142c were compared with those elicited in pigs challenged with the same viruses. RESULTS Compared with VR2332c or mock infection, JA142c induced increased levels of type I interferons and pro-inflammatory cytokines (TNF-α, IL-1α/β, IL-6, IL-8, and IL-12) in PAMs, and these elevated levels were comparable to the cytokine induction observed in PRRSV-challenged pigs. Furthermore, significantly greater numbers of activated CD4+ T cells, type I helper T cells, cytotoxic T cells and total IFN-γ+ cells were observed in JA142c-challenged pigs than in VR2332c- or mock-challenged pigs. CONCLUSIONS Based on these results, the innate immune response patterns (particularly IFN-α, TNF-α and IL-12) to specific PRRSV strains in PAMs might reflect those elicited by the same viruses in pigs.
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Affiliation(s)
- Nadeem Shabir
- College of Veterinary Medicine, Chonbuk National University, 79 Gobong-ro, Iksan, Jeonbuk, Korea.,Division of Animal Biotechnology, Faculty of Veterinary Sciences and Animal Husbandry, Sher-e-Kashmir University of Agricultural Sciences and Technology of Kashmir, Srinagar, India
| | - Amina Khatun
- College of Veterinary Medicine, Chonbuk National University, 79 Gobong-ro, Iksan, Jeonbuk, Korea
| | - Salik Nazki
- College of Veterinary Medicine, Chonbuk National University, 79 Gobong-ro, Iksan, Jeonbuk, Korea
| | - Suna Gu
- College of Environmental & Biosource Science, Division of Biotechnology, Chonbuk National University, Iksan, South Korea
| | - Sang-Myoung Lee
- College of Environmental & Biosource Science, Division of Biotechnology, Chonbuk National University, Iksan, South Korea
| | - Tai-Young Hur
- Dairy Science Division, National Institute of Animal Science, Rural Development Administration, Cheonan, 31000, South Korea
| | - Myoun-Sik Yang
- College of Veterinary Medicine, Chonbuk National University, 79 Gobong-ro, Iksan, Jeonbuk, Korea
| | - Bumseok Kim
- College of Veterinary Medicine, Chonbuk National University, 79 Gobong-ro, Iksan, Jeonbuk, Korea
| | - Won-Il Kim
- College of Veterinary Medicine, Chonbuk National University, 79 Gobong-ro, Iksan, Jeonbuk, Korea.
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10
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Hu P, Chen X, Huang L, Liu S, Zang F, Xing J, Zhang Y, Liang J, Zhang G, Liao M, Qi W. A highly pathogenic porcine reproductive and respiratory syndrome virus candidate vaccine based on Japanese encephalitis virus replicon system. PeerJ 2017; 5:e3514. [PMID: 28740748 PMCID: PMC5522605 DOI: 10.7717/peerj.3514] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2017] [Accepted: 06/07/2017] [Indexed: 01/19/2023] Open
Abstract
In the swine industry, porcine reproductive and respiratory syndrome (PRRS) is a highly contagious disease which causes heavy economic losses worldwide. Effective prevention and disease control is an important issue. In this study, we described the construction of a Japanese encephalitis virus (JEV) DNA-based replicon with a cytomegalovirus (CMV) promoter based on the genome of Japanese encephalitis live vaccine virus SA14-14-2, which is capable of offering a potentially novel way to develop and produce vaccines against a major pathogen of global health. This JEV DNA-based replicon contains a large deletion in the structural genes (C-prM-E). A PRRSV GP5/M was inserted into the deletion position of JEV DNA-based replicons to develop a chimeric replicon vaccine candidate for PRRSV. The results showed that BALB/c mice models with the replicon vaccines pJEV-REP-G-2A-M-IRES and pJEV-REP-G-2A-M stimulated antibody responses and induced a cellular immune response. Analysis of ELSA data showed that vaccination with the replicon vaccine expressing GP5/M induced a better antibodies response than traditional DNA vaccines. Therefore, the results suggested that this ectopic expression system based on JEV DNA-based replicons may represent a useful molecular platform for various biological applications, and the JEV DNA-based replicons expressing GP5/M can be further developed into a novel, safe vaccine candidate for PRRS.
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Affiliation(s)
- Pingsheng Hu
- National and Regional Joint Engineering Laboratory for Medicament of Zoonoses Prevention and Control, College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Xiaoming Chen
- National and Regional Joint Engineering Laboratory for Medicament of Zoonoses Prevention and Control, College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Lihong Huang
- National and Regional Joint Engineering Laboratory for Medicament of Zoonoses Prevention and Control, College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Shukai Liu
- National and Regional Joint Engineering Laboratory for Medicament of Zoonoses Prevention and Control, College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Fuyu Zang
- National and Regional Joint Engineering Laboratory for Medicament of Zoonoses Prevention and Control, College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Jinchao Xing
- National and Regional Joint Engineering Laboratory for Medicament of Zoonoses Prevention and Control, College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Youyue Zhang
- National and Regional Joint Engineering Laboratory for Medicament of Zoonoses Prevention and Control, College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Jiaqi Liang
- National and Regional Joint Engineering Laboratory for Medicament of Zoonoses Prevention and Control, College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Guihong Zhang
- National and Regional Joint Engineering Laboratory for Medicament of Zoonoses Prevention and Control, College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Ming Liao
- National and Regional Joint Engineering Laboratory for Medicament of Zoonoses Prevention and Control, College of Veterinary Medicine, South China Agricultural University, Guangzhou, China.,Key Laboratory of Zoonoses, Key Laboratory of Animal Vaccine Development, Ministry of Agriculture, Guangzhou, China.,Key Laboratory of Zoonoses Prevention and Control of Guangdong Province, Ministry of Agriculture, Guangzhou, China
| | - Wenbao Qi
- National and Regional Joint Engineering Laboratory for Medicament of Zoonoses Prevention and Control, College of Veterinary Medicine, South China Agricultural University, Guangzhou, China.,Key Laboratory of Zoonoses, Key Laboratory of Animal Vaccine Development, Ministry of Agriculture, Guangzhou, China.,Key Laboratory of Zoonoses Prevention and Control of Guangdong Province, Ministry of Agriculture, Guangzhou, China
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11
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Vu HLX, Pattnaik AK, Osorio FA. Strategies to broaden the cross-protective efficacy of vaccines against porcine reproductive and respiratory syndrome virus. Vet Microbiol 2016; 206:29-34. [PMID: 27692670 DOI: 10.1016/j.vetmic.2016.09.014] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2016] [Revised: 09/19/2016] [Accepted: 09/20/2016] [Indexed: 02/06/2023]
Abstract
Porcine reproductive and respiratory syndrome virus (PRRSV) is one of the most economically important viral pathogens currently affecting swine production worldwide. Although PRRS vaccines have been commercially available for over 20 years, the available vaccines are considered inadequately effective for control and eradication of the virus. Major obstacles for the development of a highly effective PRRS vaccine include the highly variable nature of the viral genome, the viral ability to subvert the host immune system, and the incomplete understanding of the immune protection against PRRSV infection. This article summarizes the impediments for the development of a highly protective PRRS vaccine and reviews the vaccinology approaches that have been attempted to overcome one of the most formidable challenges, which is the substantial genetic variation among PRRSV isolates, to broaden the antigenic coverage of PRRS vaccines.
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Affiliation(s)
- Hiep L X Vu
- Nebraska Center for Virology, and School of Veterinary Medicine and Biomedical Sciences, University of Nebraska-Lincoln, Lincoln, Nebraska, United States.
| | - Asit K Pattnaik
- Nebraska Center for Virology, and School of Veterinary Medicine and Biomedical Sciences, University of Nebraska-Lincoln, Lincoln, Nebraska, United States
| | - Fernando A Osorio
- Nebraska Center for Virology, and School of Veterinary Medicine and Biomedical Sciences, University of Nebraska-Lincoln, Lincoln, Nebraska, United States
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12
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Evaluation of the Cross-Protective Efficacy of a Chimeric Porcine Reproductive and Respiratory Syndrome Virus Constructed Based on Two Field Strains. Viruses 2016; 8:v8080240. [PMID: 27556483 PMCID: PMC4997602 DOI: 10.3390/v8080240] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2016] [Revised: 07/27/2016] [Accepted: 08/16/2016] [Indexed: 11/17/2022] Open
Abstract
One of the major hurdles to porcine reproductive and respiratory syndrome (PRRS) vaccinology is the limited or no cross-protection conferred by current vaccines. To overcome this challenge, a PRRS chimeric virus (CV) was constructed using an FL12-based cDNA infectious clone in which open reading frames (ORFs) 3-4 and ORFs 5-6 were replaced with the two Korean field isolates K08-1054 and K07-2273,respectively. This virus was evaluated as a vaccine candidate to provide simultaneous protection against two genetically distinct PRRS virus (PRRSV) strains. Thirty PRRS-negative three-week-old pigs were divided into five groups and vaccinated with CV, K08-1054, K07-2273, VR-2332, or a mock inoculum. At 25 days post-vaccination (dpv), the pigs in each group were divided further into two groups and challenged with either K08-1054 or K07-2273. All of the pigs were observed until 42 dpv and were euthanized for pathological evaluation. Overall, the CV-vaccinated group exhibited higher levels of tumor necrosis factor-alpha (TNF-α), interferon-gamma (IFN-γ), and interleukin-12 (IL-12) expression and of serum virus-neutralizing antibodies compared with the other groups after vaccination and also demonstrated better protection levels against both viruses compared with the challenge control group. Based on these results, it was concluded that CV might be an effective vaccine model that can confer a broader range of cross-protection to various PRRSV strains.
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