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Kulanayake S, Dar F, Tikoo SK. Regions of Bovine Adenovirus-3 Protein VII Involved in Interactions with Viral and Cellular Proteins. Viruses 2024; 16:732. [PMID: 38793614 PMCID: PMC11125828 DOI: 10.3390/v16050732] [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: 03/21/2024] [Revised: 04/30/2024] [Accepted: 04/30/2024] [Indexed: 05/26/2024] Open
Abstract
The L 1 region of bovine adenovirus (BAdV)-3 encodes a multifunctional protein named protein VII. Anti-protein VII sera detected a protein of 26 kDa in transfected or BAdV-3-infected cells, which localizes to nucleus and nucleolus of infected/transfected cells. Analysis of mutant protein VII identified four redundant overlapping nuclear/nucleolar localization signals as deletion of all four potential nuclear/nucleolar localization signals localizes protein VII predominantly to the cytoplasm. The nuclear import of protein VII appears to use importin α (α-1), importin-β (β-1) and transportin-3 nuclear transport receptors. In addition, different nuclear transport receptors also require part of protein VII outside nuclear localization sequences for efficient interaction. Proteomic analysis of protein complexes purified from recombinant BAdV-3 expressing protein VII containing Strep Tag II identified potential viral and cellular proteins interacting with protein VII. Here, we confirm that protein VII interacts with IVa2 and protein VIII in BAdV-3-infected cells. Moreover, amino acids 91-101 and 126-137, parts of non-conserved region of protein VII, are required for interaction with IVa2 and protein VIII, respectively.
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Affiliation(s)
- Shermila Kulanayake
- Vaccinology & Immunotherapeutics Program, School of Public Health, University of Saskatchewan, Saskatoon, SK S7N 5E5, Canada; (S.K.); (F.D.)
- Vaccine and Infectious Disease Organization (VIDO), University of Saskatchewan, Saskatoon, SK S7N 5E5, Canada
| | - Faryal Dar
- Vaccinology & Immunotherapeutics Program, School of Public Health, University of Saskatchewan, Saskatoon, SK S7N 5E5, Canada; (S.K.); (F.D.)
- Vaccine and Infectious Disease Organization (VIDO), University of Saskatchewan, Saskatoon, SK S7N 5E5, Canada
| | - Suresh K. Tikoo
- Vaccinology & Immunotherapeutics Program, School of Public Health, University of Saskatchewan, Saskatoon, SK S7N 5E5, Canada; (S.K.); (F.D.)
- Vaccine and Infectious Disease Organization (VIDO), University of Saskatchewan, Saskatoon, SK S7N 5E5, Canada
- Veterinary Microbiology, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, SK S7N 5B4, Canada
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2
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Wang A, Liu N, Zhao J, Niu Y, Chen Y, Zhou J, Liu E, Zhang G. Development of a double-antibody sandwich enzyme-linked immunosorbent assay for rapid detection of VZV. J Virol Methods 2024; 324:114874. [PMID: 38154579 DOI: 10.1016/j.jviromet.2023.114874] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2023] [Revised: 12/13/2023] [Accepted: 12/25/2023] [Indexed: 12/30/2023]
Abstract
BACKGROUND Varicella zoster virus (VZV) is the pathogen of varicella and herpes zoster, it is necessary to develop a rapid, sensitive and specific detection method for the prevention and control of related diseases. METHODS We inserted the gB protein extracellular region gene (gB-ex, 1-2208 bp) of VZV into lentivirus vector, and then obtained the recombinant gB protein through mammalian expression system. BALB/c mice were immunized multiple times with purified gB protein as immunogen. Then four strains of high affinity monoclonal antibodies targeting gB protein were prepared by cell fusion technique. Monoclonal antibodies 5G4 and HRP-4E9 were selected as capture and detection antibodies respectively, and a double-antibody sandwich ELISA method was established for detection. RESULTS The detection limit of the DAS-ELISA was 156 PFU/mL, and there was no cross-reaction with Herpes simplex virus-1/Herpes simplex virus-2/Pseudorabies virus. The coefficients of variation of intra-assay and inter-assay repeatability were less than 5%. CONCLUSIONS In this study, a double-antibody sandwich enzyme-linked immunosorbent assay (DAS-ELISA) was established for the detection of VZV. The assay has good sensitivity, specificity and repeatability, which provides strong technical support and product guarantee for the rapid clinical detection of VZV.
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Affiliation(s)
- Aiping Wang
- Longhu Laboratory of Advanced Immunology, Zhengzhou, Henan, China; School of Life Sciences, Zhengzhou University, Zhengzhou, 450001 Henan, China
| | - Na Liu
- School of Life Sciences, Zhengzhou University, Zhengzhou, 450001 Henan, China
| | - Jianguo Zhao
- School of Advanced Agricultural Sciences, Peking University, Beijing, 100871 China
| | - Yan Niu
- School of Life Sciences, Zhengzhou University, Zhengzhou, 450001 Henan, China
| | - Yumei Chen
- Longhu Laboratory of Advanced Immunology, Zhengzhou, Henan, China; School of Life Sciences, Zhengzhou University, Zhengzhou, 450001 Henan, China
| | - Jingming Zhou
- Longhu Laboratory of Advanced Immunology, Zhengzhou, Henan, China; School of Life Sciences, Zhengzhou University, Zhengzhou, 450001 Henan, China
| | - Enping Liu
- Longhu Laboratory of Advanced Immunology, Zhengzhou, Henan, China; School of Life Sciences, Zhengzhou University, Zhengzhou, 450001 Henan, China
| | - Gaiping Zhang
- Longhu Laboratory of Advanced Immunology, Zhengzhou, Henan, China; School of Life Sciences, Zhengzhou University, Zhengzhou, 450001 Henan, China; School of Advanced Agricultural Sciences, Peking University, Beijing, 100871 China.
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3
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Li L, Sun W, Hu Q, Wang T, Zhu G, Zhao Q, Zhou EM. Identification of MYH9 Key Domain Involved in the Entry of PRRSV Into Permissive Cells. Front Microbiol 2022; 13:865343. [PMID: 35694306 PMCID: PMC9174932 DOI: 10.3389/fmicb.2022.865343] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2022] [Accepted: 04/06/2022] [Indexed: 11/25/2022] Open
Abstract
Porcine reproductive and respiratory syndrome virus (PRRSV) is an important pathogen that causes huge losses economically to the pig industry worldwide. Previous research suggested that receptor dependence is necessary for PRRSV infection. MYH9 and CD163 are indispensable for PRRSV entry into a porcine alveolar macrophage. In the present study, human MYH9 (hMYH9) and mouse MYH9 (mMYH9), similar to swine MYH9, could also accelerate PRRSV infection in pCD163-mediated cell lines. Knockdown of MYH9 activity using the specific small interfering RNA or inhibitor (blebbistatin) concomitantly decreased PRRSV infection. C-terminal fragment of MYH9 (PRA) proteins from different mammalian species contains a conserved binding domain (aa1676-1791) for PRRSV binding, since the recombinant MYH91676−1791protein could inhibit the PRRSV infection significantly. Furthermore, the specific polyclonal antibody of MYH91676−1791 could block PRRSV infection in host cells. These data strongly supported that MYH9, a very important cofactor, participated in PRRSV entry into target cells, which may facilitate the development of a new therapeutic agent to control PRRSV infection.
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Affiliation(s)
- Liangliang Li
- College of Agronomy, Liaocheng University, Liaocheng, China
- *Correspondence: Liangliang Li
| | - Weiyao Sun
- Department of Preventive Veterinary Medicine, College of Veterinary Medicine, Northwest A and F University, Xianyang, China
| | - Qifan Hu
- Department of Preventive Veterinary Medicine, College of Veterinary Medicine, Northwest A and F University, Xianyang, China
| | - Tongtong Wang
- College of Agronomy, Liaocheng University, Liaocheng, China
| | - Guang Zhu
- Shandong Vocational Animal Science and Veterinary College, Weifang, China
| | - Qin Zhao
- Department of Preventive Veterinary Medicine, College of Veterinary Medicine, Northwest A and F University, Xianyang, China
| | - En-Min Zhou
- Department of Preventive Veterinary Medicine, College of Veterinary Medicine, Northwest A and F University, Xianyang, China
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4
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Niu Y, Wang A, Zhou J, Liu H, Chen Y, Ding P, Qi Y, Liang C, Zhu X, Zhang G. Development of an Indirect ELISA Kit for Rapid Detection of Varicella-Zoster Virus Antibody by Glycoprotein E. Front Microbiol 2022; 13:897752. [PMID: 35572642 PMCID: PMC9093680 DOI: 10.3389/fmicb.2022.897752] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2022] [Accepted: 04/07/2022] [Indexed: 12/15/2022] Open
Abstract
Varicella-zoster virus (VZV), a highly infectious agent that causes varicella (chickenpox), can also cause zoster (shingles), a disorder that is frequently associated with severe neuralgia. A reliable serological VZV diagnostic assay would be useful for identifying unprotected individuals and for surveilling post-vaccination immunoprotection status. Toward this goal, VZV membrane glycoprotein E (gE), the immunodominant VZV protein, served as target antigen in an indirect ELISA kit developed here to detect anti-VZV antibodies in clinical samples. For target antigen preparation, Chinese hamster ovary (CHO) cells were modified to express and secrete the VZV gE ectodomain, which was subsequently purified and used as coating antigen in an indirect ELISA. Ultimately, the optimal purified gE coating antigen concentration was determined to be 2 μg.ml−1 and the OD450nm detection cutoff value was 0.286. The coefficient of variation (CV) of intra-assay and inter-assay were <10 and 15%, respectively. A comparative test of 66 clinical samples showed that the coincidence rate was 93.9% between the indirect ELISA and a commercial varicella-zoster virus IgG ELISA kit. Thus, the indirect ELISA kit developed here may be useful for achieving rapid, sensitive, and specific detection of anti-VZV antibodies.
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Affiliation(s)
- Yan Niu
- School of Life Sciences, Zhengzhou University, Zhengzhou, China
| | - Aiping Wang
- School of Life Sciences, Zhengzhou University, Zhengzhou, China.,Henan Longhu Modern Immunity Laboratory, Zhengzhou University, Zhengzhou, China
| | - Jingming Zhou
- School of Life Sciences, Zhengzhou University, Zhengzhou, China
| | - Hongliang Liu
- School of Life Sciences, Zhengzhou University, Zhengzhou, China.,Henan Longhu Modern Immunity Laboratory, Zhengzhou University, Zhengzhou, China
| | - Yumei Chen
- School of Life Sciences, Zhengzhou University, Zhengzhou, China
| | - Peiyang Ding
- School of Life Sciences, Zhengzhou University, Zhengzhou, China.,Henan Longhu Modern Immunity Laboratory, Zhengzhou University, Zhengzhou, China
| | - Yanhua Qi
- School of Life Sciences, Zhengzhou University, Zhengzhou, China
| | - Chao Liang
- School of Life Sciences, Zhengzhou University, Zhengzhou, China
| | - Xifang Zhu
- School of Life Sciences, Zhengzhou University, Zhengzhou, China
| | - Gaiping Zhang
- School of Life Sciences, Zhengzhou University, Zhengzhou, China.,Henan Longhu Modern Immunity Laboratory, Zhengzhou University, Zhengzhou, China.,College of Agriculture, Peking University, Beijing, China
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Wang X, Qiao X, Sui L, Zhao H, Li F, Tang YD, Shi W, Guo Y, Jiang Y, Wang L, Zhou H, Tang L, Xu Y, Li Y. Establishment of stable Vero cell lines expressing TMPRSS2 and MSPL: A useful tool for propagating porcine epidemic diarrhea virus in the absence of exogenous trypsin. Virulence 2021; 11:669-685. [PMID: 32471322 PMCID: PMC7550007 DOI: 10.1080/21505594.2020.1770491] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Porcine epidemic diarrhea virus (PEDV) is the causative agent of porcine epidemic diarrhea, causing substantial economic losses to the swine industry worldwide. However, the development of PEDV vaccine is hampered by its low propagation titer in vitro, due to difficulty in adapting to the cells and complex culture conditions, even in the presence of trypsin. Furthermore, the frequent variation, recombination, and evolution of PEDV resulted in reemergence and vaccination failure. In this study, we established the Vero/TMPRSS2 and Vero/MSPL cell lines, constitutively expressing type II transmembrane serine protease TMPRSS2 and MSPL, in order to increase the stability and titer of PEDV culture and isolation in vitro. Our study revealed that the Vero/TMPRSS2, especially Vero/MSPL cell lines, can effectively facilitate the titer and multicycle replication of cell-adapted PEDV in the absence of exogenous trypsin, by cleaving and activating PEDV S protein. Furthermore, our results also highlighted that Vero/TMPRSS2 and Vero/MSPL cells can significantly enhance the isolation of PEDV from the clinical tissue samples as well as promote viral infection and replication by cell-cell fusion. The successful construction of the Vero/TMPRSS2 and Vero/MSPL cell lines provides a useful approach for the isolation and propagation of PEDV, simplification of virus culture, and large-scale production of industrial vaccine, and the cell lines are also an important system to research PEDV S protein cleaved by host protease.
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Affiliation(s)
- Xiaona Wang
- College of Veterinary Medicine, Northeast Agricultural University , Harbin, P.R. China
| | - Xinyuan Qiao
- College of Veterinary Medicine, Northeast Agricultural University , Harbin, P.R. China.,Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development , Harbin, P.R. China
| | - Ling Sui
- College of Veterinary Medicine, Northeast Agricultural University , Harbin, P.R. China
| | - Haiyuan Zhao
- Department of Swine Breeding, Jiangsu Hanswine Food Co., Ltd , Ma'anshan, Anhui Province, China
| | - Fengsai Li
- College of Veterinary Medicine, Northeast Agricultural University , Harbin, P.R. China
| | - Yan-Dong Tang
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences , Harbin, China
| | - Wen Shi
- College of Animal Science and Technology, Northeast Agricultural University , Harbin, P.R. China
| | - Yuyao Guo
- College of Veterinary Medicine, Northeast Agricultural University , Harbin, P.R. China
| | - Yanping Jiang
- College of Veterinary Medicine, Northeast Agricultural University , Harbin, P.R. China
| | - Li Wang
- College of Veterinary Medicine, Northeast Agricultural University , Harbin, P.R. China
| | - Han Zhou
- College of Veterinary Medicine, Northeast Agricultural University , Harbin, P.R. China
| | - Lijie Tang
- College of Veterinary Medicine, Northeast Agricultural University , Harbin, P.R. China.,Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development , Harbin, P.R. China
| | - Yigang Xu
- College of Veterinary Medicine, Northeast Agricultural University , Harbin, P.R. China.,Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development , Harbin, P.R. China
| | - Yijing Li
- College of Veterinary Medicine, Northeast Agricultural University , Harbin, P.R. China.,Heilongjiang Key Laboratory for Animal Disease Control and Pharmaceutical Development , Harbin, P.R. China
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Li Q, Liu Y, Xu S, Zhao K, Ling Y, Liu R, Ali A, Bai J. Caveolin-1 is involved in encephalomyocarditis virus replication in BHK-21 cells. Virol J 2021; 18:63. [PMID: 33761945 PMCID: PMC7989721 DOI: 10.1186/s12985-021-01521-3] [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: 10/23/2020] [Accepted: 03/02/2021] [Indexed: 11/23/2022] Open
Abstract
Background Encephalomyocarditis virus, member of Cardiovirus genus within Picornaviridae family, is an important pathogen that infects different domestic and wild animals. However, the molecular mechanism of its entry remains unclear. In this study, we investigated the mechanism of EMCV infectivity in relation to endocytic pathway using BHK-21 cells. Methods The function of numerous cellular key factors implicated in the various endocytic mechanisms were systematically explored using chemical inhibitors. Furthermore, RNA interference (RNAi) as well as the overexpression of dominant protein combined to virus infectivity assays, and confocal microscopy was used to examine EMCV infection in details. Results The results indicated that the EMCV entry into BHK-21 cells depends on caveolin, dynamin, and actin but not clathrin nor macropinocytosis pathways. The effects of overexpression and knockdown of caveolin-1, one components of the caveolae, was examined on EMCV infection. The results showed that EMCV infection was positive correlation with caveolin-1 expression. Confocal microscopy analysis and internalization assay showed that caveolin-1 is required at the early stage of EMCV infection. Conclusions Caveolin-1, dynamin, and actin-dependent endocytosis pathways are necessary for EMCV infection in vitro.
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Affiliation(s)
- Qiongyi Li
- Biomedical Research Center, Key Laboratory of Biotechnology and Bioengineering of State Ethnic Affairs Commission, Northwest Minzu University, Lanzhou, China.,College of Life Science and Engineering, Northwest Minzu University, Lanzhou, China
| | - Yang Liu
- Biomedical Research Center, Key Laboratory of Biotechnology and Bioengineering of State Ethnic Affairs Commission, Northwest Minzu University, Lanzhou, China.,College of Life Science and Engineering, Northwest Minzu University, Lanzhou, China
| | - Shujuan Xu
- Biomedical Research Center, Key Laboratory of Biotechnology and Bioengineering of State Ethnic Affairs Commission, Northwest Minzu University, Lanzhou, China.,College of Life Science and Engineering, Northwest Minzu University, Lanzhou, China
| | - Kexue Zhao
- Biomedical Research Center, Key Laboratory of Biotechnology and Bioengineering of State Ethnic Affairs Commission, Northwest Minzu University, Lanzhou, China.,College of Life Science and Engineering, Northwest Minzu University, Lanzhou, China
| | - Ying Ling
- College of Life Science and Engineering, Northwest Minzu University, Lanzhou, China
| | - Rongxiu Liu
- College of Life Science and Engineering, Northwest Minzu University, Lanzhou, China
| | - Amjad Ali
- Biomedical Research Center, Key Laboratory of Biotechnology and Bioengineering of State Ethnic Affairs Commission, Northwest Minzu University, Lanzhou, China
| | - Jialin Bai
- Biomedical Research Center, Key Laboratory of Biotechnology and Bioengineering of State Ethnic Affairs Commission, Northwest Minzu University, Lanzhou, China. .,College of Life Science and Engineering, Northwest Minzu University, Lanzhou, China.
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7
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Zhao X, Tikoo SK. Nuclear and Nucleolar Localization of Bovine Adenovirus-3 Protein V. Front Microbiol 2021; 11:579593. [PMID: 33488533 PMCID: PMC7815533 DOI: 10.3389/fmicb.2020.579593] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2020] [Accepted: 12/03/2020] [Indexed: 02/01/2023] Open
Abstract
The L2 region of bovine adenovirus-3 (BAdV-3) encodes a Mastadenovirus genus-specific protein, designated as pV, which is important for the production of progeny viruses. Here, we demonstrate that BAdV-3 pV, expressed as 55 kDa protein, localizes to the nucleus and specifically targets nucleolus of the infected cells. Analysis of deletion mutants of pV suggested that amino acids 81–120, 190–210, and 380–389 act as multiple nuclear localization signals (NLS), which also appear to serve as the binding sites for importin α-3 protein, a member of the importin α/β nuclear import receptor pathway. Moreover, pV amino acids 21–50 and 380–389 appear to act as nucleolar localization signals (NoLs). Interestingly, amino acids 380–389 appear to act both as NLS and as NoLS. The presence of NoLS is essential for the production of infectious progeny virions, as deletion of both NoLs are lethal for the production of infectious BAdV-3. Analysis of mutant BAV.pVd1d3 (isolated in pV completing CRL cells) containing deletion/mutation of both NoLS in non-complementing CRL cells not only revealed the altered intracellular localization of mutant pV but also reduced the expression of some late proteins. However, it does not appear to affect the incorporation of viral proteins, including mutant pV, in BAV.pVd1d3 virions. Further analysis of CsCl purified BAV.pVd1d3 suggested the presence of thermo-labile virions with disrupted capsids, which appear to affect the infectivity of the progeny virions. Our results suggest that pV contains overlapping and non-overlapping NoLS/NLS. Moreover, the presence of both NoLS appear essential for the production of stable and infectious progeny BAV.pVd1d3 virions.
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Affiliation(s)
- Xin Zhao
- VIDO-InterVac, University of Saskatchewan, Saskatoon, SK, Canada.,Department of Veterinary Microbiology, University of Saskatchewan, Saskatoon, SK, Canada
| | - Suresh K Tikoo
- VIDO-InterVac, University of Saskatchewan, Saskatoon, SK, Canada.,Department of Veterinary Microbiology, University of Saskatchewan, Saskatoon, SK, Canada.,Vaccinology and Imuunothepapeutics Program, School of Public Health, University of Saskatchewan, Saskatoon, SK, Canada
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Khosa S, Bravo Araya M, Griebel P, Arsic N, Tikoo SK. Bovine Adenovirus-3 Tropism for Bovine Leukocyte Sub-Populations. Viruses 2020; 12:E1431. [PMID: 33322850 PMCID: PMC7763465 DOI: 10.3390/v12121431] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2020] [Revised: 12/02/2020] [Accepted: 12/04/2020] [Indexed: 11/20/2022] Open
Abstract
A number of characteristics including lack of virulence and the ability to grow to high titers, have made bovine adenovirus-3 (BAdV-3) a vector of choice for further development as a vaccine-delivery vehicle for cattle. Despite the importance of blood leukocytes, including dendritic cells (DC), in the induction of protective immune responses, little is known about the interaction between BAdV-3 and bovine blood leukocytes. Here, we demonstrate that compared to other leukocytes, bovine blood monocytes and neutrophils are significantly transduced by BAdV404a (BAdV-3, expressing enhanced yellow green fluorescent protein [EYFP]) at a MOI of 1-5 without a significant difference in the mean fluorescence of EYFP expression. Moreover, though expression of some BAdV-3-specific proteins was observed, no progeny virions were detected in the transduced monocytes or neutrophils. Interestingly, addition of the "RGD" motif at the C-terminus of BAdV-3 minor capsid protein pIX (BAV888) enhanced the ability of the virus to enter the monocytes without altering the tropism of BAdV-3. The increased uptake of BAV888 by monocytes was associated with a significant increase in viral genome copies and the abundance of EYFP and BAdV-3 19K transcripts compared to BAdV404a-transduced monocytes. Our results suggest that BAdV-3 efficiently transduces monocytes and neutrophils in the absence of viral replication. Moreover, RGD-modified capsid significantly increases vector uptake without affecting the initial interaction with monocytes.
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Affiliation(s)
- Sugandhika Khosa
- VIDO-InterVac., 120 Veterinary Road, University of Saskatchewan, Saskatoon, SK S7N 5E3, Canada; (S.K.); (M.B.A.); (P.G.); (N.A.)
- Vaccinology & Immunotherapeutics Program, School of Public Health, University of Saskatchewan, Saskatoon, SK S7N 5E3, Canada
| | - Maria Bravo Araya
- VIDO-InterVac., 120 Veterinary Road, University of Saskatchewan, Saskatoon, SK S7N 5E3, Canada; (S.K.); (M.B.A.); (P.G.); (N.A.)
- Vaccinology & Immunotherapeutics Program, School of Public Health, University of Saskatchewan, Saskatoon, SK S7N 5E3, Canada
| | - Philip Griebel
- VIDO-InterVac., 120 Veterinary Road, University of Saskatchewan, Saskatoon, SK S7N 5E3, Canada; (S.K.); (M.B.A.); (P.G.); (N.A.)
- Vaccinology & Immunotherapeutics Program, School of Public Health, University of Saskatchewan, Saskatoon, SK S7N 5E3, Canada
| | - Natasa Arsic
- VIDO-InterVac., 120 Veterinary Road, University of Saskatchewan, Saskatoon, SK S7N 5E3, Canada; (S.K.); (M.B.A.); (P.G.); (N.A.)
| | - Suresh K. Tikoo
- VIDO-InterVac., 120 Veterinary Road, University of Saskatchewan, Saskatoon, SK S7N 5E3, Canada; (S.K.); (M.B.A.); (P.G.); (N.A.)
- Vaccinology & Immunotherapeutics Program, School of Public Health, University of Saskatchewan, Saskatoon, SK S7N 5E3, Canada
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9
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Porcine Adenovirus Type 3 E3 Encodes a Structural Protein Essential for Capsid Stability and Production of Infectious Progeny Virions. J Virol 2018; 92:JVI.00680-18. [PMID: 30068639 DOI: 10.1128/jvi.00680-18] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2018] [Accepted: 07/16/2018] [Indexed: 11/20/2022] Open
Abstract
The adenovirus E3 region encodes proteins that are not essential for viral replication in vitro The porcine adenovirus type 3 (PAdV-3) E3 region encodes three proteins, including 13.7K. Here, we report that 13.7K is expressed as an early protein, which localizes to the nucleus of infected cells. The 13.7K protein is a structural protein, as it is incorporated in CsCl-purified virions. The 13.7K protein appears to be essential for PAdV-3 replication, as mutant PAV13.73A expressing a mutated 13.7K could be isolated only in VIDO AS2 cells expressing the 13.7K protein. Analysis of PAV13.73A suggested that even in the presence of reduced levels of some late viral proteins, there appeared to be no effect on virus assembly and production of mature virions. Further analysis of CsCl-purified PAV13.73A by transmission electron microscopy revealed the presence of disrupted/broken capsids, suggesting that inactivation of 13.7K protein expression may produce fragile capsids. Our results suggest that the PAdV-3 E3 region-encoded 13.7K protein is a capsid protein, which appears to be essential for the formation of stable capsids and production of infectious progeny virions.IMPORTANCE Although E3 region-encoded proteins are involved in the modulation of leukocyte functions (N. Arnberg, Proc Natl Acad Sci U S A 110:19976-19977, 2013) and inducing a lytic infection of lymphocytes (V. K. Murali, D. A. Ornelles, L. R. Gooding, H. T. Wilms, W. Huang, A. E. Tollefson, W. S. Wold, and C. Garnett-Benson, J Virol 88:903-912, 2014), none of the E3 proteins appear to be a component of virion capsid or required for replication of adenovirus. Here, we demonstrate that the 13.7K protein encoded by the E3 region of porcine adenovirus type 3 is a component of progeny virion capsids and appears to be essential for maintaining the integrity of virion capsid and production of infectious progeny virions. To our knowledge, this is the first report to suggest that an adenovirus E3-encoded protein is an essential structural protein.
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10
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Ren J, Zhang L, Cheng P, Zhang F, Liu Z, Tikoo SK, Chen R, Du E. Generation of infectious clone of bovine adenovirus type I expressing a visible marker gene. J Virol Methods 2018; 261:139-146. [PMID: 30176304 DOI: 10.1016/j.jviromet.2018.08.020] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2018] [Revised: 08/02/2018] [Accepted: 08/29/2018] [Indexed: 02/06/2023]
Abstract
BACKGROUND AND OBJECTIVE Bovine adenovirus type 3 (BAdV3) has been widely used as a vector for vaccine research and development, whereas BAdV1 biology and BAdV1-based vectored vaccine have been less frequently reported. We aimed to construct an infectious BAdV1 clone and explore the functions of BAdV1 genes. METHODS First, the infectious clone of pUCBAdV1 containing the full-length BAdV1 DNA and the recombinant plasmid pUCBAV1-EYFP expressing the marker gene EYFP were constructed. Then, the recombinant viruses BAdV101 and rBAdV1-EYFP were rescued. The stability of the exogenous EYFP gene was analyzed by continuous passage, PCR, and western blotting. Finally, the virus neutralization titer of the rescued viruses was evaluated. RESULTS The infectious clones of pUCBAdV1 and pUCBAV1-EYFP were constructed and the recombinant viruses BAdV101 and rBAdV1-EYFP were rescued successfully. Moreover, the results showed that the EYFP gene could be expressed continuously. In addition, the replication of rBAdV1-EYFP was less efficient than that of the wild-type virus wtBAdV1 in vitro, while the efficacy of BAdV101 replication was almost the same as that of wtBAdV1. Furthermore, the neutralization test showed that the neutralization titer of rBAdV1-EYFP was consistent with that of wtBAdV1. CONCLUSION To our knowledge, the infectious genome of pUCBAV1-EYFP expressing a visible marker gene EYFP was constructed for the first time, and the finding forms a basis for the development of BAdV1-based efficient vectored vaccine.
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Affiliation(s)
- Jingjing Ren
- College of Veterinary Medicine, North-west A&F University, Yangling, Shaanxi, China
| | - Lu Zhang
- College of Veterinary Medicine, North-west A&F University, Yangling, Shaanxi, China
| | - Peng Cheng
- College of Veterinary Medicine, North-west A&F University, Yangling, Shaanxi, China
| | - Fan Zhang
- College of Veterinary Medicine, North-west A&F University, Yangling, Shaanxi, China
| | - Zehui Liu
- College of Veterinary Medicine, North-west A&F University, Yangling, Shaanxi, China
| | - Suresh K Tikoo
- VIDO-InteVac, University of Saskatchewan Saskatoon, Saskatchewan, Canada; Vaccinology & Immunotherapeutics Program, School of Public Health, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Rui Chen
- Shaanxi Novelever Bio-Technique Co. Ltd., China.
| | - Enqi Du
- College of Veterinary Medicine, North-west A&F University, Yangling, Shaanxi, China; Wuhan BioCom Pioneers Co. Ltd., China.
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11
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Said A, Wang W, Woldermariam T, Tikoo SK. Domains of bovine adenovirus-3 protein 22K involved in interacting with viral protein 52K and cellular importins α-5/α-7. Virology 2018; 522:209-219. [PMID: 30053654 DOI: 10.1016/j.virol.2018.07.015] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2018] [Revised: 07/11/2018] [Accepted: 07/12/2018] [Indexed: 12/30/2022]
Abstract
The L6 region of bovine adenovirus-3 (BAdV-3) encodes unspliced and spliced proteins named 22K and 33K, respectively. Earlier, anti-22K sera detected two proteins of 42- and 37-kDa in infected cells and 42-kDa protein in transfected cells. Here, we demonstrate that 22K protein localizes to the nucleus of BAdV-3 infected or transfected cells. Analysis of mutant 22K proteins suggested that amino acids 231-250 of non-conserved C-terminus of 22K are required for nuclear localization. The nuclear import of 22K appears to utilize multiple importin (α-5 and α-7) of importin α/β nuclear import pathway. Mutational analysis of 22K identified four basic residues 238RRRK241, which apparently are essential for the nuclear localization of 22K. Our results suggest that the nuclear localization of 22K appear essential for virus replication and production of progeny BAdV-3. Furthermore, we demonstrate that N-terminus amino acid 35-65 conserved in 22K and 33K interact with 52K protein in BAdV-3 infected cells.
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Affiliation(s)
- Abdelrahman Said
- VIDO-InterVac, University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 5E3; Parasitology and Animal Diseases Department, National Research Center, Dokki, Giza, Egypt
| | - Wenxiu Wang
- VIDO-InterVac, University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 5E3; Shandong Binzhou Animal Science & Veterinary Medicine Academy, 256600 Binzhou, Shandong, China
| | - Tekeleselassie Woldermariam
- VIDO-InterVac, University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 5E3; Veterinary Microbiology, University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 5E3
| | - Suresh K Tikoo
- VIDO-InterVac, University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 5E3; Veterinary Microbiology, University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 5E3; Vaccinology & Immunotherapeutics Program, School of Public Health, University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 5E3.
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12
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Gaba A, Ayalew LE, Patel A, Kumar P, Tikoo SK. Bovine adenovirus‐3 protein VIII associates with eukaryotic initiation factor‐6 during infection. Cell Microbiol 2018. [DOI: 10.1111/cmi.12842] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Amit Gaba
- VIDO‐InterVacUniversity of Saskatchewan Saskatoon Saskatchewan Canada
- Veterinary MicrobiologyUniversity of Saskatchewan Saskatoon Saskatchewan Canada
| | - Lisanework E. Ayalew
- VIDO‐InterVacUniversity of Saskatchewan Saskatoon Saskatchewan Canada
- Veterinary MicrobiologyUniversity of Saskatchewan Saskatoon Saskatchewan Canada
| | - Amrutlal Patel
- VIDO‐InterVacUniversity of Saskatchewan Saskatoon Saskatchewan Canada
- Veterinary MicrobiologyUniversity of Saskatchewan Saskatoon Saskatchewan Canada
| | - Pankaj Kumar
- VIDO‐InterVacUniversity of Saskatchewan Saskatoon Saskatchewan Canada
| | - Suresh K. Tikoo
- VIDO‐InterVacUniversity of Saskatchewan Saskatoon Saskatchewan Canada
- Veterinary MicrobiologyUniversity of Saskatchewan Saskatoon Saskatchewan Canada
- Vaccinology & Immunotherapeutics Program, School of Public HealthUniversity of Saskatchewan Saskatoon Saskatchewan Canada
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13
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Zhang P, Xue Q, Ma J, Ren J, Xia S, Zhang L, Wang W, Tikoo SK, Du E. Bovine adenovirus type 3 virions cannot be rescued in vivo after full-length viral genome transfection in the absence of detectable polypeptide IX. J Vet Sci 2017; 18:217-227. [PMID: 27586461 PMCID: PMC5489469 DOI: 10.4142/jvs.2017.18.2.217] [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: 11/18/2015] [Revised: 05/30/2016] [Accepted: 08/26/2016] [Indexed: 11/25/2022] Open
Abstract
Bovine adenovirus type 3 (BAdV3) is being used in the development of potential vehicles for gene therapy and vectored vaccine. To that end, a more comprehensive description of BAdV3 biology is essential. In this study, we focused on the role of pIX in BAdV3 virion rescue after full-length BAdV3 genome transfection. Initially, pIX deletion or initiation codon mutation abolished the production of progeny virions, which suggested that pIX was essential for the rescue of BAdV3 containing a full-length genome. Moreover, through transfection of a panel of pIX mutant BAdV3 genomes, we observed that the conserved N-terminus and the putative leucine zipper element (PLZP) were essential for virion rescue, whereas the C-terminus following the coiled-coil domain was non-essential. In addition, swap of the PLZP element and its following region of BAdV3 pIX to corresponding domains of human adenovirus type 5 (HAdV5) did not affect virion production, whereas swap of the entire pIX abolished production of progeny virions. We suggest that failure of the full-length BAdV3 pIX swap might be due to species specificity of its N-terminus region before the PLZP element.
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Affiliation(s)
- Peng Zhang
- College of Veterinary Medicine, North-west A&F University, Yangling 712100, China
| | - Qinghong Xue
- Chinese Institute of Veterinary Drug Controls, Beijing 100000, China
| | - Jing Ma
- College of Veterinary Medicine, North-west A&F University, Yangling 712100, China
| | - Jingjing Ren
- College of Veterinary Medicine, North-west A&F University, Yangling 712100, China
| | - Shuili Xia
- College of Veterinary Medicine, North-west A&F University, Yangling 712100, China
| | - Lu Zhang
- College of Veterinary Medicine, North-west A&F University, Yangling 712100, China
| | - Wenbin Wang
- College of Veterinary Medicine, North-west A&F University, Yangling 712100, China
| | - Suresh K Tikoo
- VIDO-InteVac, University of Saskatchewan Saskatoon, Saskatchewan, Canada.,Vaccinology & Immunotherapeutics program, School of Public Health, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Enqi Du
- College of Veterinary Medicine, North-west A&F University, Yangling 712100, China
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14
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Gaba A, Ayalew L, Makadiya N, Tikoo S. Proteolytic Cleavage of Bovine Adenovirus 3-Encoded pVIII. J Virol 2017; 91:e00211-17. [PMID: 28298598 PMCID: PMC5411589 DOI: 10.1128/jvi.00211-17] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2017] [Accepted: 03/04/2017] [Indexed: 11/20/2022] Open
Abstract
Proteolytic maturation involving cleavage of one nonstructural and six structural precursor proteins including pVIII by adenovirus protease is an important aspect of the adenovirus life cycle. The pVIII encoded by bovine adenovirus 3 (BAdV-3) is a protein of 216 amino acids and contains two potential protease cleavage sites. Here, we report that BAdV-3 pVIII is cleaved by adenovirus protease at both potential consensus protease cleavage sites. Usage of at least one cleavage site appears essential for the production of progeny BAdV-3 virions as glycine-to-alanine mutation of both protease cleavage sites appears lethal for the production of progeny virions. However, mutation of a single protease cleavage site of BAdV-3 pVIII significantly affects the efficient production of infectious progeny virions. Further analysis revealed no significant defect in endosome escape, genome replication, capsid formation, and virus assembly. Interestingly, cleavage of pVIII at both potential cleavage sites appears essential for the production of stable BAdV-3 virions as BAdV-3 expressing pVIII containing a glycine-to-alanine mutation of either of the potential cleavage sites is thermolabile, and this mutation leads to the production of noninfectious virions.IMPORTANCE Here, we demonstrated that the BAdV-3 adenovirus protease cleaves BAdV-3 pVIII at both potential protease cleavage sites. Although cleavage of pVIII at one of the two adenoviral protease cleavage sites is required for the production of progeny virions, the mutation of a single cleavage site of pVIII affects the efficient production of infectious progeny virions. Further analysis indicated that the mutation of a single protease cleavage site (glycine to alanine) of pVIII produces thermolabile virions, which leads to the production of noninfectious virions with disrupted capsids. We thus provide evidence about the requirement of proteolytic cleavage of pVIII for production of infectious progeny virions. We feel that our study has significantly advanced the understanding of the requirement of adenovirus protease cleavage of pVIII.
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Affiliation(s)
- Amit Gaba
- VIDO-InterVac, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
- Department of Veterinary Microbiology, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Lisanework Ayalew
- VIDO-InterVac, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
- Department of Veterinary Microbiology, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Niraj Makadiya
- VIDO-InterVac, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Suresh Tikoo
- VIDO-InterVac, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
- Department of Veterinary Microbiology, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
- Vaccinology and Immunotherapeutics Program, School of Public Health, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
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15
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Zhao X, Tikoo SK. Deletion of pV affects integrity of capsid causing defect in the infectivity of bovine adenovirus-3. J Gen Virol 2016; 97:2657-2667. [PMID: 27521148 DOI: 10.1099/jgv.0.000570] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Members of the genus Mastadenovirus including bovine adenovirus 3 (BAdV-3) encode a genus-specific unique protein named pV. The pV encoded by BAdV-3 is a protein of 423 aa showing 40.9 % identity to pV of human adenovirus 2. Here, we report the construction and analysis of recombinant BAdV-3 (BAV.dV) containing deletion of pV. The BAV.dV could only be isolated in CRL.pV cells expressing pV, suggesting that pV appears essential for the infection of BAdV-3. Analysis of BAV.dV suggested that despite affecting some late gene expression in virus-infected cells, there was no significant difference in the incorporation of viral proteins in the mature virions. Moreover, analysis of mature virions revealed degraded capsids leading to change in morphology and infectivity of BAV.dV. Furthermore, analysis of the genome sequence of different clones of BAV.dV passaged in different cell lines revealed no mutations in core proteins pVII and pX\Mu suggesting that the replication defect may not be rescued. Our results suggest that pV is required for proper viral assembly of BAdV-3 as lack of pV produces aberrant capsids. Moreover, altered capsids lead to the production of non-infectious BAV.dV virions.
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Affiliation(s)
- Xin Zhao
- VIDO-InterVac, University of Saskatchewan, Saskatoon, SK S7N 5E3, Canada.,Veterinary Microbiology, University of Saskatchewan, Saskatoon, SK S7N 5E3, Canada
| | - Suresh K Tikoo
- Veterinary Microbiology, University of Saskatchewan, Saskatoon, SK S7N 5E3, Canada.,Vaccinology & Immunotherapeutics Program, School of Public Health, University of Saskatchewan, Saskatoon, SK S7N 5E3, Canada.,VIDO-InterVac, University of Saskatchewan, Saskatoon, SK S7N 5E3, Canada
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16
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Liu H, Liang C, Duan H, Zhang X, Wang X, Xiao S, Zhou EM. Intracellularly expressed nanobodies against non-structural protein 4 of porcine reproductive and respiratory syndrome virus inhibit virus replication. Biotechnol Lett 2016; 38:1081-8. [PMID: 27010387 DOI: 10.1007/s10529-016-2086-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2016] [Accepted: 03/17/2016] [Indexed: 11/30/2022]
Abstract
OBJECTIVE To isolate specific nanobodies to porcine reproductive and respiratory syndrome virus (PRRSV) non-structural protein 4 (Nsp4) and investigate their potential antiviral activities. RESULTS Three PRRSV Nsp4-specific nanobodies were isolated from a phage display library of the variable domains of camelid heavy chain-only antibodies. Nanobody genes were introduced into MARC-145 cells using lentivirus vectors to establish cell lines stably expressing nanobodies. These intracellularly expressed nanobodies were tested for interaction with PRRSV-encoded Nsp4 within PRRSV-infected MARC-145 cells. Nb41 and Nb43 intrabodies each potently inhibited PRRSV replication, protected MARC-145 cells from PRRSV-induced cytopathic effect and fully blocked PRRSV replication at an MOI of 0.001 or lower. CONCLUSION Intracellularly expressed Nb41 and Nb43 potently suppressed PRRSV replication in MARC-145 cells. Nanobodies hold great potential for development as novel antiviral treatments for PRRSV infection.
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Affiliation(s)
- Hongliang Liu
- Department of Preventive Veterinary Medicine, College of Veterinary Medicine, Northwest A&F University, Yangling, 712100, Shaanxi, China
| | - Chao Liang
- Department of Preventive Veterinary Medicine, College of Veterinary Medicine, Northwest A&F University, Yangling, 712100, Shaanxi, China
| | - Hong Duan
- Department of Preventive Veterinary Medicine, College of Veterinary Medicine, Northwest A&F University, Yangling, 712100, Shaanxi, China
| | - Xiaobin Zhang
- Department of Preventive Veterinary Medicine, College of Veterinary Medicine, Northwest A&F University, Yangling, 712100, Shaanxi, China
| | - Xiangpeng Wang
- Department of Preventive Veterinary Medicine, College of Veterinary Medicine, Northwest A&F University, Yangling, 712100, Shaanxi, China
| | - Shuqi Xiao
- Department of Preventive Veterinary Medicine, College of Veterinary Medicine, Northwest A&F University, Yangling, 712100, Shaanxi, China
| | - En-Min Zhou
- Department of Preventive Veterinary Medicine, College of Veterinary Medicine, Northwest A&F University, Yangling, 712100, Shaanxi, China.
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17
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Abstract
Many nonhuman adenoviruses (AdVs) of simian, bovine, porcine, canine, ovine, murine, and fowl origin are being developed as gene delivery systems for recombinant vaccines and gene therapy applications. In addition to circumventing preexisting human AdV (HAdV) immunity, nonhuman AdV vectors utilize coxsackievirus-adenovirus receptor or other receptors for vector internalization, thereby expanding the range of cell types that can be targeted. Nonhuman AdV vectors also provide excellent platforms for veterinary vaccines. A specific nonhuman AdV vector when used in its species of origin could provide an excellent animal model for evaluating the vector efficacy and pathogenesis. These vectors are useful in prime–boost approaches with other AdV vectors or with other gene delivery systems including DNA immunization and viral or bacterial vectors. When multiple vector inoculations are required, nonhuman AdV vectors could supplement HAdV or other viral vectors.
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18
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Li Q, Wang X, Wang C, Yu Y, Wang G, Gao J, Liu H, Xie H, Huang B, Li Z, Kong N, Zhang G, Hsu WH, Zhou EM. Intracellular expression of an anti-idiotypic antibody single-chain variable fragment reduces porcine reproductive and respiratory syndrome virus infection in MARC-145 cells. Antivir Ther 2015. [PMID: 26214224 DOI: 10.3851/imp2980] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
BACKGROUND Porcine reproductive and respiratory syndrome virus (PRRSV) is the causative agent of porcine reproductive and respiratory syndrome; it is one of the most economically important viral diseases affecting the swine industry worldwide. At present, neither live-attenuated nor inactivated PRRSV vaccines can provide sustainable disease control. Our previous studies have demonstrated that PRRSV infection can produce the auto-anti-idiotypic antibodies (aAb2s) specific to the idiotypic antibodies against PRRSV GP5, which plays an important role in the host immune responses to PRRSV infection. In the present study, a single-chain variable antibody fragment (scFv) from the monoclonal anti-idiotypic antibody specific for the idiotypic antibody against GP5 was expressed in MARC-145 cells and its effect on virus infection in vitro was evaluated. METHODS An scFv was constructed from the anti-idiotypic antibody (Mab2-5G2) and was named 5G2scFv. The lentiviral vector system was used as a vehicle to deliver 5G2scFv into MARC-145 cells. The effect of 5G2scFv expression in MARC-145 was analysed by determining the PRRSV N protein level and the virus titre in the supernatant. Virus attachment and the level of type I interferon (IFN) were determined to elucidate the mechanism of the scFv effect. RESULTS 5G2scFv was delivered in MARC-145 cells using the lentiviral vector system as confirmed by the western blot and indirect immunofluorescence assays. The PRRSV challenge experiments demonstrated that expressed 5G2scFv in MARC-145 strongly reduced PRRSV infection and replication by inhibiting protein synthesis and progeny virus production. This effect was not due to the change of viability or virus binding, but increased IFN-α at messenger RNA and protein levels. CONCLUSIONS The expression of the anti-idiotypic antibody 5G2scFv in MARC-145 cells has the interferential effect on PRRSV infection in the cells by induction of IFN-α, which provides a novel therapeutic approach for PRRSV infection.
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Affiliation(s)
- Qiongyi Li
- Department of Preventive Veterinary Medicine, College of Veterinary Medicine, Northwest A&F University, Yangling, China
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19
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Makadiya N, Gaba A, Tikoo SK. Cleavage of bovine adenovirus type 3 non-structural 100K protein by protease is required for nuclear localization in infected cells but is not essential for virus replication. J Gen Virol 2015; 96:2749-2763. [PMID: 26033117 DOI: 10.1099/vir.0.000205] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The L6 region of bovine adenovirus type 3 (BAdV-3) encodes a non-structural protein named 100K. Rabbit antiserum raised against BAdV-3 100K recognized a protein of 130 kDa at 12-24 h and proteins of 130, 100, 95 and 15 kDa at 36-48 h after BAdV-3 infection. The 100K species localized to the nucleus and the cytoplasm of BAdV-3-infected cells. In contrast, 100K localized predominantly to the cytoplasm of the transfected cells. However, BAdV-3 infection of cells transfected with 100K-enhanced yellow fluorescent protein-expressing plasmid detected fluorescent protein in the nucleus of the cells, suggesting that other viral proteins may be required for the nuclear localization of 100K. Interaction of BAdV-3 100K with BAdV-3 33K protein did not alter the cytoplasmic localization of 100K. However, co-expression of BAdV-3 100K and BAdV-3 protease localized 100K to the nucleolus of the transfected cells. Subsequent analysis suggested that BAdV-3 protease cleaves 100K at two identified potential protease cleavage sites (aa 740-745 and 781-786) in transfected or BAdV-3-infected cells. The cleaved C terminus (107 aa) was localized to the nucleolus of the transfected cells. Further analysis suggested that the cleaved C terminus contains a bipartite nuclear localization signal and utilizes import receptor importin-α3 of the classical importin-α/β transport pathway for nuclear transport. Successful isolation of recombinant BAdV-3 expressing mutant 100K (substitution of alanine for glycine in the potential protease cleavage site) suggested that cytoplasmic cleavage of BAdV-3 100K by adenoviral protease is not essential for virus replication.
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Affiliation(s)
- Nirajkumar Makadiya
- VIDO-InterVac, University of Saskatchewan, Saskatoon, Saskatchewan, S7N 5E3 Canada.,Veterinary Microbiology, University of Saskatchewan, Saskatoon, Saskatchewan, S7N 5E3 Canada
| | - Amit Gaba
- VIDO-InterVac, University of Saskatchewan, Saskatoon, Saskatchewan, S7N 5E3 Canada.,Veterinary Microbiology, University of Saskatchewan, Saskatoon, Saskatchewan, S7N 5E3 Canada
| | - Suresh K Tikoo
- Veterinary Microbiology, University of Saskatchewan, Saskatoon, Saskatchewan, S7N 5E3 Canada.,VIDO-InterVac, University of Saskatchewan, Saskatoon, Saskatchewan, S7N 5E3 Canada.,Vaccinology & Immunotherapeutics program, School of Public Health, University of Saskatchewan, Saskatoon, Saskatchewan, S7N 5E3 Canada
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20
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Chu Z, Niu B, Li N, Hu Y, Li J, Yu P, Wu C, Yan X, Lei A, Hua J. A lentiviral vector visualizing the germ cell specification in vitro under the control of Figla promoter. Appl Biochem Biotechnol 2015; 176:66-75. [PMID: 25652828 DOI: 10.1007/s12010-015-1523-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2014] [Accepted: 01/21/2015] [Indexed: 01/30/2023]
Abstract
Premature ovarian failure (POF) is affecting more and more women, which is the loss of function of the ovaries before age 40. To elucidate the underlying mechanisms of the oogenesis is of importance to understand the causes of impaired fertility and POF. However, mammalian oogenesis in vivo is a complex process. Thus, building an oogenesis visualizing system is beneficial for the study of oogenesis. In this study, we found that Figla is specifically expressed in female mice oocyte. Then, we constructed a lentiviral vector (pTRIP-Figla-EGFP-puro) under the control of Figla promoter, which drived enhanced green fluorescent protein (EGFP) as an indicator and used the lentiviral vector transduction the ovarian cells and induced germ cells derived from human umbilical cord mesenchymal stem cells (hUC-MSCs), and the results showed that the lentiviral vector we constructed was able to specifically express green fluorescent protein (GFP) in the ovarian oocyte and induced oocyte-like cells derived from hUC-MSCs, which was Figla-positive cells. These results suggest that pTRIP-Figla-EGFP vector provides a new system to study the role of Figla in oogenesis, and an approach to study the development and the differentiation of germ cells derived from stem cells.
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Affiliation(s)
- Zhili Chu
- College of Veterinary Medicine, Shaanxi Centre of Stem Cells Engineering and Technology, Northwest A&F University, Yangling, Shaanxi, 712100, China
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21
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Bovine adenovirus-3 as a vaccine delivery vehicle. Vaccine 2014; 33:493-9. [PMID: 25498212 PMCID: PMC7115382 DOI: 10.1016/j.vaccine.2014.11.055] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2014] [Revised: 11/21/2014] [Accepted: 11/28/2014] [Indexed: 12/15/2022]
Abstract
The use of vaccines is an effective and relatively inexpensive means of controlling infectious diseases, which cause heavy economic losses to the livestock industry through animal loss, decreased productivity, treatment expenses and decreased carcass quality. However, some vaccines produced by conventional means are imperfect in many respects including virulence, safety and efficacy. Moreover, there are no vaccines for some animal diseases. Although genetic engineering has provided new ways of producing effective vaccines, the cost of production for veterinary use is a critical criterion for selecting the method of production and delivery of vaccines. The cost effective production and intrinsic ability to enter cells has made adenovirus vectors a highly efficient tool for delivery of vaccine antigens. Moreover, adenoviruses induce both humoral and cellular immune responses to expressed vaccine antigens. Since nonhuman adenoviruses are species specific, the development of animal specific adenoviruses as vaccine delivery vectors is being evaluated. This review summarizes the work related to the development of bovine adenovirus-3 as a vaccine delivery vehicle in animals, particularly cattle.
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22
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Gao J, Ji P, Zhang M, Wang X, Li N, Wang C, Xiao S, Mu Y, Zhao Q, Du T, Sun Y, Hiscox JA, Zhang G, Zhou EM. GP5 expression in Marc-145 cells inhibits porcine reproductive and respiratory syndrome virus infection by inducing beta interferon activity. Vet Microbiol 2014; 174:409-418. [DOI: 10.1016/j.vetmic.2014.09.030] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2014] [Revised: 09/24/2014] [Accepted: 09/25/2014] [Indexed: 12/14/2022]
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23
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Kulshreshtha V, Ayalew LE, Islam A, Tikoo SK. Conserved arginines of bovine adenovirus-3 33K protein are important for transportin-3 mediated transport and virus replication. PLoS One 2014; 9:e101216. [PMID: 25019945 PMCID: PMC4096500 DOI: 10.1371/journal.pone.0101216] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2014] [Accepted: 06/04/2014] [Indexed: 01/14/2023] Open
Abstract
The L6 region of bovine adenovirus (BAdV)-3 encodes a spliced protein designated 33K. The 33K specific sera detected five major proteins and three minor proteins in transfected or virus infected cells, which could arise by internal initiation of translation and alternative splicing. The 33K protein is predominantly localized to the nucleus of BAdV-3 infected cells. The 33K nuclear transport utilizes both classical importin-α/-β and importin-β dependent nuclear import pathways and preferentially binds to importin-α5 and transportin-3 receptors, respectively. Analysis of mutant 33K proteins demonstrated that amino acids 201–240 of the conserved C-terminus of 33K containing RS repeat are required for nuclear localization and, binding to both importin-α5 and transportin-3 receptors. Interestingly, the arginine residues of conserved RS repeat are required for binding to transportin-3 receptor but not to importin-α5 receptor. Moreover, mutation of arginines residues of RS repeat proved lethal for production of progeny virus. Our results suggest that arginines of RS repeat are required for efficient nuclear transport of 33K mediated by transportin-3, which appears to be essential for replication and production of infectious virion.
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Affiliation(s)
- Vikas Kulshreshtha
- VIDO-InterVac, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
- Veterinary Microbiology, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Lisanework E. Ayalew
- VIDO-InterVac, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
- Veterinary Microbiology, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Azharul Islam
- VIDO-InterVac, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Suresh K. Tikoo
- VIDO-InterVac, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
- Veterinary Microbiology, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
- Vaccinology & Immunotherapeutics Program, School of Public Health, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
- * E-mail:
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Choi JH, Schafer SC, Zhang L, Juelich T, Freiberg AN, Croyle MA. Modeling pre-existing immunity to adenovirus in rodents: immunological requirements for successful development of a recombinant adenovirus serotype 5-based ebola vaccine. Mol Pharm 2013; 10:3342-55. [PMID: 23915419 DOI: 10.1021/mp4001316] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Pre-existing immunity (PEI) to human adenovirus serotype 5 (Ad5) worldwide is the primary limitation to routine clinical use of Ad5-based vectors in immunization platforms. Using systemic and mucosal PEI induction models in rodents (mice and guinea pigs), we assessed the influence of PEI on the type of adaptive immune response elicited by an Ad5-based vaccine for Ebola with respect to immunization route. Splenocytes isolated from vaccinated animals revealed that immunization by the same route in which PEI was induced significantly compromised Ebola Zaire glycoprotein (ZGP)-specific IFN-γ+ CD8+ T cells and ZGP-specific multifunctional CD8+ T cell populations. ZGP-specific IgG1 antibody levels were also significantly reduced and a sharp increase in serum anti-Ad5 neutralizing antibody (NAB) titers were noted following immunization. These immune parameters correlated with poor survival after lethal challenge with rodent-adapted Ebola Zaire virus (ZEBOV). Although the number of IFN-γ+ CD8+ T cells was reduced in animals given the vaccine by a different route from that used for PEI induction, the multifunctional CD8+ T cell response was not compromised. Survival rates in these groups were higher than when PEI was induced by the same route as immunization. These results suggest that antigen-specific multifunctional CD8(+) T cell and Th2 type antibody responses compromised by PEI to Ad5 are required for protection from Ebola. They also illustrate that methods for induction of PEI used in preclinical studies must be carefully evaluated for successful development of novel Ad5-based vaccines.
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Affiliation(s)
- Jin Huk Choi
- Division of Pharmaceutics, College of Pharmacy, The University of Texas at Austin , Austin, Texas 78712, United States
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Ibanes S, Kremer EJ. Canine adenovirus type 2 vector generation via I-Sce1-mediated intracellular genome release. PLoS One 2013; 8:e71032. [PMID: 23936483 PMCID: PMC3731271 DOI: 10.1371/journal.pone.0071032] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2013] [Accepted: 06/24/2013] [Indexed: 02/06/2023] Open
Abstract
When canine adenovirus type 2 (CAdV-2, or also commonly referred to as CAV-2) vectors are injected into the brain parenchyma they preferentially transduce neurons, are capable of efficient axonal transport to afferent regions, and allow transgene expression for at last >1 yr. Yet, translating these data into a user-friendly vector platform has been limited because CAV-2 vector generation is challenging. Generation of E1-deleted adenovirus vectors often requires transfection of linear DNA fragments of >30 kb containing the vector genome into an E1-transcomplementing cell line. In contrast to human adenovirus type 5 vector generation, CAV-2 vector generation is less efficient due, in part, to a reduced ability to initiate replication and poor transfectibility of canine cells with large, linear DNA fragments. To improve CAV-2 vector generation, we generated an E1-transcomplementing cell line expressing the estrogen receptor (ER) fused to I-SceI, a yeast meganuclease, and plasmids containing the I-SceI recognition sites flanking the CAV-2 vector genome. Using transfection of supercoiled plasmid and intracellular genome release via 4-OH-tamoxifen-induced nuclear translocation of I-SceI, we improved CAV-2 vector titers 1,000 fold, and in turn increased the efficacy of CAV-2 vector generation.
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Affiliation(s)
- Sandy Ibanes
- Institut de Génétique Moléculaire de Montpellier, CNRS, Montpellier, France
- Université de Montpellier I, Montpellier, France
- Université Montpellier II, Montpellier, France
| | - Eric J. Kremer
- Institut de Génétique Moléculaire de Montpellier, CNRS, Montpellier, France
- Université de Montpellier I, Montpellier, France
- Université Montpellier II, Montpellier, France
- * E-mail:
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