1
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Kamble NM, Senevirathne A, Koh HB, Lee JI, Lee JH. Self-destructing Salmonella via temperature induced gene E of phage PhiX174 improves influenza HA DNA vaccine immune protection against H1N1 infection in mice model. J Immunol Methods 2019; 472:7-15. [PMID: 31175847 DOI: 10.1016/j.jim.2019.06.008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2019] [Revised: 05/22/2019] [Accepted: 06/04/2019] [Indexed: 10/26/2022]
Abstract
The delivery of DNA vaccines is the principle impediment for implementation of DNA vaccination on a mass scale. In this study, we report a temperature induced conditionally expressed phage PhiX174 gene E mediated lysis of Salmonella under in vivo conditions that can increase the immunogenicity of a DNA vaccine delivered via Salmonella carrier system. We electroporated gene E encoding lysis plasmid pJHL187 along with the pcDNA-HA plasmid encoding H1N1 HA into attenuated Salmonella Typhimurium, strain JOL1893. Using C57BL/6 mice as the model, we showed that the mice intragastrically vaccinated with JOL1893 induced significant production of HA-specific humoral and cell mediated immune responses compared to the JOL1837, which carry pcDNA-HA plasmid alone. Furthermore, mice vaccinated with JOL1893 vaccine were fully protected against the lethal H1N1 challenge compared to the JOL1837 strain, which showed 90% protection only. However, none of the animals survived treated with either the PBS or the Salmonella carrying empty vector. Taken together, our results indicate that mucosal immunization with conditional lysis enabled live attenuated S. Typhimurium as a DNA vaccine carrier can induce efficient systemic and mucosal immune responses, and improves immune protection against a highly pathogenic H1N1 infection in mice model.
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Affiliation(s)
- Nitin Machindra Kamble
- College of Veterinary Medicine, Chonbuk National University, Iksan Campus, 54596, Republic of Korea
| | - Amal Senevirathne
- College of Veterinary Medicine, Chonbuk National University, Iksan Campus, 54596, Republic of Korea
| | - Hong Bum Koh
- College of Veterinary Medicine, Chonnam National University, Gwangju 61186, Republic of Korea
| | - Jae Il Lee
- College of Veterinary Medicine, Chonnam National University, Gwangju 61186, Republic of Korea
| | - John Hwa Lee
- College of Veterinary Medicine, Chonbuk National University, Iksan Campus, 54596, Republic of Korea.
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2
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Jiang B, Li Z, Ou B, Duan Q, Zhu G. Targeting ideal oral vaccine vectors based on probiotics: a systematical view. Appl Microbiol Biotechnol 2019; 103:3941-3953. [PMID: 30915504 DOI: 10.1007/s00253-019-09770-7] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2019] [Revised: 03/11/2019] [Accepted: 03/12/2019] [Indexed: 12/29/2022]
Abstract
Probiotics have great potential to be engineered into oral vaccine delivery systems, which can facilitate elicitation of mucosal immunity without latent risks of pathogenicity. Combined with the progressive understanding of probiotics and the mucosal immune system as well as the advanced biotechniques of genetic engineering, the development of promising oral vaccine vectors based on probiotics is available while complicated and demanding. Therefore, a systematical view on the design of practical probiotic vectors is necessary, which will help to logically analyze and resolve the problems that might be neglected during our exploration. Here, we attempt to systematically summarize several fundamental issues vital to the effectiveness of the vector of probiotics, including the stability of the engineered vectors, the optimization of antigen expression, the improvement of colonization, and the enhancement of immunoreactivity. We also compared the existent strategies and some developing ones, attempting to figure out an optimal strategy that might deserve to be referred in the future development of oral vaccine vectors based on probiotics.
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Affiliation(s)
- Boyu Jiang
- College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, China.,Jiangsu Co-Innovation Center for Important Animal Infectious Diseases and Zoonoses, Joint International Research Laboratory of Agriculture and Agri-Product Safety of Ministry of Education of China, Yangzhou, 225009, China
| | - Zhendong Li
- College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, China.,Jiangsu Co-Innovation Center for Important Animal Infectious Diseases and Zoonoses, Joint International Research Laboratory of Agriculture and Agri-Product Safety of Ministry of Education of China, Yangzhou, 225009, China
| | - Bingming Ou
- College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, China.,Jiangsu Co-Innovation Center for Important Animal Infectious Diseases and Zoonoses, Joint International Research Laboratory of Agriculture and Agri-Product Safety of Ministry of Education of China, Yangzhou, 225009, China.,College of Life Science, Zhaoqing University, Zhaoqing, 526061, China
| | - Qiangde Duan
- College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, China. .,Jiangsu Co-Innovation Center for Important Animal Infectious Diseases and Zoonoses, Joint International Research Laboratory of Agriculture and Agri-Product Safety of Ministry of Education of China, Yangzhou, 225009, China.
| | - Guoqiang Zhu
- College of Veterinary Medicine, Yangzhou University, Yangzhou, 225009, China. .,Jiangsu Co-Innovation Center for Important Animal Infectious Diseases and Zoonoses, Joint International Research Laboratory of Agriculture and Agri-Product Safety of Ministry of Education of China, Yangzhou, 225009, China.
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3
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Zhao X, Dai Q, Jia R, Zhu D, Liu M, Wang M, Chen S, Sun K, Yang Q, Wu Y, Cheng A. Two Novel Salmonella Bivalent Vaccines Confer Dual Protection against Two Salmonella Serovars in Mice. Front Cell Infect Microbiol 2017; 7:391. [PMID: 28929089 PMCID: PMC5591321 DOI: 10.3389/fcimb.2017.00391] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2017] [Accepted: 08/22/2017] [Indexed: 12/12/2022] Open
Abstract
Non-typhoidal Salmonella includes thousands of serovars that are leading causes of foodborne diarrheal illness worldwide. In this study, we constructed three bivalent vaccines for preventing both Salmonella Typhimurium and Salmonella Newport infections by using the aspartate semialdehyde dehydrogenase (Asd)-based balanced-lethal vector-host system. The constructed Asd+ plasmid pCZ11 carrying a subset of the Salmonella Newport O-antigen gene cluster including the wzx-wbaR-wbaL-wbaQ-wzy-wbaW-wbaZ genes was introduced into three Salmonella Typhimurium mutants: SLT19 (Δasd) with a smooth LPS phenotype, SLT20 (Δasd ΔrfbN) with a rough LPS phenotype, and SLT22 (Δasd ΔrfbN ΔpagL::T araC PBADrfbN) with a smooth LPS phenotype when grown with arabinose. Immunoblotting demonstrated that SLT19 harboring pCZ11 [termed SLT19 (pCZ11)] co-expressed the homologous and heterologous O-antigens; SLT20 (pCZ11) exclusively expressed the heterologous O-antigen; and when arabinose was available, SLT22 (pCZ11) expressed both types of O-antigens, while in the absence of arabinose, SLT22 (pCZ11) expressed only the heterologous O-antigen. Exclusive expression of the heterologous O-antigen in Salmonella Typhimurium decreased the swimming ability of the bacterium and its susceptibility to polymyxin B. Next, the crp gene was deleted from the three recombinant strains for attenuation purposes, generating the three bivalent vaccine strains SLT25 (pCZ11), SLT26 (pCZ11), and SLT27 (pCZ11), respectively. Groups of BALB/c mice (12 mice/group) were orally immunized with 109 CFU of each vaccine strain twice at an interval of 4 weeks. Compared with a mock immunization, immunization with all three vaccine strains induced significant serum IgG responses against both Salmonella Typhimurium and Salmonella Newport LPS. The bacterial loads in the mouse tissues were significantly lower in the three vaccine-strain-immunized groups than in the mock group after either Salmonella Typhimurium or Salmonella Newport lethal challenge. All of the mice in the three vaccine-immunized groups survived the lethal Salmonella Typhimurium challenge. In contrast, SLT26 (pCZ11) and SLT27 (pCZ11) conferred full protection against lethal Salmonella Newport challenge, but SLT25 (pCZ11) provided only 50% heterologous protection. Thus, we developed two novel Salmonella bivalent vaccines, SLT26 (pCZ11) and SLT27 (pCZ11), suggesting that the delivery of a heterologous O-antigen in attenuated Salmonella strains is a prospective approach for developing Salmonella vaccines with broad serovar coverage.
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Affiliation(s)
- Xinxin Zhao
- Research Center of Avian Diseases, College of Veterinary Medicine, Sichuan Agricultural UniversityChengdu, China.,Key Laboratory of Animal Disease and Human Health of Sichuan ProvinceChengdu, China.,Institute of Preventive Veterinary Medicine, Sichuan Agricultural UniversityChengdu, China
| | - Qinlong Dai
- Institute of Preventive Veterinary Medicine, Sichuan Agricultural UniversityChengdu, China
| | - Renyong Jia
- Research Center of Avian Diseases, College of Veterinary Medicine, Sichuan Agricultural UniversityChengdu, China.,Key Laboratory of Animal Disease and Human Health of Sichuan ProvinceChengdu, China.,Institute of Preventive Veterinary Medicine, Sichuan Agricultural UniversityChengdu, China
| | - Dekang Zhu
- Research Center of Avian Diseases, College of Veterinary Medicine, Sichuan Agricultural UniversityChengdu, China.,Key Laboratory of Animal Disease and Human Health of Sichuan ProvinceChengdu, China.,Institute of Preventive Veterinary Medicine, Sichuan Agricultural UniversityChengdu, China
| | - Mafeng Liu
- Research Center of Avian Diseases, College of Veterinary Medicine, Sichuan Agricultural UniversityChengdu, China.,Key Laboratory of Animal Disease and Human Health of Sichuan ProvinceChengdu, China.,Institute of Preventive Veterinary Medicine, Sichuan Agricultural UniversityChengdu, China
| | - Mingshu Wang
- Research Center of Avian Diseases, College of Veterinary Medicine, Sichuan Agricultural UniversityChengdu, China.,Key Laboratory of Animal Disease and Human Health of Sichuan ProvinceChengdu, China.,Institute of Preventive Veterinary Medicine, Sichuan Agricultural UniversityChengdu, China
| | - Shun Chen
- Research Center of Avian Diseases, College of Veterinary Medicine, Sichuan Agricultural UniversityChengdu, China.,Key Laboratory of Animal Disease and Human Health of Sichuan ProvinceChengdu, China.,Institute of Preventive Veterinary Medicine, Sichuan Agricultural UniversityChengdu, China
| | - Kunfeng Sun
- Research Center of Avian Diseases, College of Veterinary Medicine, Sichuan Agricultural UniversityChengdu, China.,Key Laboratory of Animal Disease and Human Health of Sichuan ProvinceChengdu, China.,Institute of Preventive Veterinary Medicine, Sichuan Agricultural UniversityChengdu, China
| | - Qiao Yang
- Research Center of Avian Diseases, College of Veterinary Medicine, Sichuan Agricultural UniversityChengdu, China.,Key Laboratory of Animal Disease and Human Health of Sichuan ProvinceChengdu, China.,Institute of Preventive Veterinary Medicine, Sichuan Agricultural UniversityChengdu, China
| | - Ying Wu
- Research Center of Avian Diseases, College of Veterinary Medicine, Sichuan Agricultural UniversityChengdu, China.,Key Laboratory of Animal Disease and Human Health of Sichuan ProvinceChengdu, China.,Institute of Preventive Veterinary Medicine, Sichuan Agricultural UniversityChengdu, China
| | - Anchun Cheng
- Research Center of Avian Diseases, College of Veterinary Medicine, Sichuan Agricultural UniversityChengdu, China.,Key Laboratory of Animal Disease and Human Health of Sichuan ProvinceChengdu, China.,Institute of Preventive Veterinary Medicine, Sichuan Agricultural UniversityChengdu, China
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4
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Yang YW, Zhang CM, Huang XJ, Zhang XX, Zhang LK, Li JH, Hua ZC. Tumor-targeted delivery of a C-terminally truncated FADD (N-FADD) significantly suppresses the B16F10 melanoma via enhancing apoptosis. Sci Rep 2016; 6:34178. [PMID: 27767039 PMCID: PMC5073321 DOI: 10.1038/srep34178] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2016] [Accepted: 09/08/2016] [Indexed: 01/21/2023] Open
Abstract
Fas-associated protein with death domain (FADD), a pivotal adaptor protein transmitting apoptotic signals, is indispensable for the induction of extrinsic apoptosis. However, overexpression of FADD can form large, filamentous aggregates, termed death effector filaments (DEFs) by self-association and initiate apoptosis independent of receptor cross-linking. A mutant of FADD, which is truncated of the C-terminal tail (m-FADD, 182–205 aa) named N-FADD (m-FADD, 1–181 aa), can dramatically up-regulate the strength of FADD self-association and increase apoptosis. In this study, it was found that over-expression of FADD or N-FADD caused apoptosis of B16F10 cells in vitro, even more, N-FADD showed a more potent apoptotic effect than FADD. Meanwhile, Attenuated Salmonella Typhimurium strain VNP20009 was engineered to express FADD or N-FADD under the control of a hypoxia-induced NirB promoter and each named VNP-pN-FADD and VNP-pN-N-FADD. The results showed both VNP-pN-FADD and VNP-pN-N-FADD delayed tumor growth in B16F10 mice model, while VNP-pN-N-FADD suppressed melanoma growth more significantly than VNP-pN-FADD. Additionally, VNP-pN-FADD and VNP-pN-N-FADD induced apoptosis of tumor cells by activating caspase-dependent apoptotic pathway. Our results show that N-FADD is a more potent apoptotic inducer and VNP20009-mediated targeted expression of N-FADD provides a possible cancer gene therapeutic approach for the treatment of melanoma.
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Affiliation(s)
- Yun-Wen Yang
- The State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing, 210023, Jiangsu, China
| | - Chun-Mei Zhang
- The State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing, 210023, Jiangsu, China
| | - Xian-Jie Huang
- The State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing, 210023, Jiangsu, China
| | - Xiao-Xin Zhang
- The State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing, 210023, Jiangsu, China
| | - Lin-Kai Zhang
- The State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing, 210023, Jiangsu, China
| | - Jia-Huang Li
- The State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing, 210023, Jiangsu, China.,Changzhou High-Tech Research Institute of Nanjing University and Jiangsu TargetPharma Laboratories Inc., Changzhou, 213164, Jiangsu, China
| | - Zi-Chun Hua
- The State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing, 210023, Jiangsu, China.,Changzhou High-Tech Research Institute of Nanjing University and Jiangsu TargetPharma Laboratories Inc., Changzhou, 213164, Jiangsu, China
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5
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Abstract
Bacterial plasmids are extensively used as cloning vectors for a number of genes for academic and commercial purposes. Moreover, attenuated bacteria carrying recombinant plasmids expressing genes with anti-tumor activity have shown promising therapeutic results in animal models of cancer. Equitable plasmid distribution between daughter cells during cell division, i.e., plasmid segregational stability, depends on many factors, including the plasmid copy number, its replication mechanism, the levels of recombinant gene expression, the type of bacterial host, and the metabolic burden associated with all these factors. Plasmid vectors usually code for antibiotic-resistant functions, and, in order to enrich the culture with bacteria containing plasmids, antibiotic selective pressure is commonly used to eliminate plasmid-free segregants from the growing population. However, administration of antibiotics can be inconvenient for many industrial and therapeutic applications. Extensive ongoing research is being carried out to develop stably-inherited plasmid vectors. Here, I present an easy and precise method for determining the kinetics of plasmid loss or maintenance for every ten generations of bacterial growth in culture.
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Affiliation(s)
- M Gabriela Kramer
- Department of Biotechnology, Instituto de Higiene, Facultad de Medicina, Universidad de la República, Montevideo, Uruguay.
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6
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Huang LY, Wang KY, Xiao D, Chen DF, Geng Y, Wang J, He Y, Wang EL, Huang JL, Xiao GY. Safety and immunogenicity of an oral DNA vaccine encoding Sip of Streptococcus agalactiae from Nile tilapia Oreochromis niloticus delivered by live attenuated Salmonella typhimurium. FISH & SHELLFISH IMMUNOLOGY 2014; 38:34-41. [PMID: 24631734 DOI: 10.1016/j.fsi.2014.02.017] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2013] [Revised: 02/15/2014] [Accepted: 02/20/2014] [Indexed: 06/03/2023]
Abstract
Attenuated Salmonella typhimurium SL7207 was used as a carrier for a reconstructed DNA vaccine against Streptococcus agalactiae. A 1.02 kb DNA fragment, encoding for a portion of the surface immunogenic protein (Sip) of S. agalactiae was inserted into pVAX1. The recombinant plasmid pVAX1-sip was transfected in EPC cells to detect the transient expression by an indirect immunofluorescence assay, together with Western blot analysis. The pVAX1-sip was transformed by electroporation into SL7207. The stability of pVAX1-sip into Salmonella was over 90% after 50 generations with antibiotic selection in vitro while remained stable over 80% during 35 generations under antibiotic-free conditions. The LD50 of SL/pVAX1-sip was 1.7 × 10(11) CFU/fish by intragastric administration which indicated a quite low virulence. Tilapias were inoculated orally at 10(8) CFU/fish, the recombinant bacteria were found present in intestinal tract, spleens and livers and eventually eliminated from the tissues 4 weeks after immunization. Fish immunized at 10(7), 10(8) and 10(9) CFU/fish with different immunization times caused various levels of serum antibody and an effective protection against lethal challenge with the wild-type strain S. agalactiae. Integration studies showed that the pVAX1-sip did not integrate with tilapia chromosomes. The DNA vaccine SL/pVAX1-sip was proved to be safe and effective in protecting tilapias against S. agalactiae infection.
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Affiliation(s)
- L Y Huang
- Research Center of Fish Disease, Sichuan Agricultural University, Ya'an, Sichuan 625014, People's Republic of China
| | - K Y Wang
- Research Center of Fish Disease, Sichuan Agricultural University, Ya'an, Sichuan 625014, People's Republic of China; Key Laboratory of Animal Disease and Human Health of Sichuan Province, Sichuan Agricultural University, Ya'an, Sichuan 625014, People's Republic of China.
| | - D Xiao
- Animal Health Research Institute of Tongwei Co., Ltd., Chengdu, Sichuan 610041, People's Republic of China
| | - D F Chen
- Research Center of Fish Disease, Sichuan Agricultural University, Ya'an, Sichuan 625014, People's Republic of China; Department of Aquaculture, Sichuan Agricultural University, Ya'an, Sichuan 625014, People's Republic of China
| | - Y Geng
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, Sichuan Agricultural University, Ya'an, Sichuan 625014, People's Republic of China
| | - J Wang
- Research Center of Fish Disease, Sichuan Agricultural University, Ya'an, Sichuan 625014, People's Republic of China
| | - Y He
- Research Center of Fish Disease, Sichuan Agricultural University, Ya'an, Sichuan 625014, People's Republic of China
| | - E L Wang
- Research Center of Fish Disease, Sichuan Agricultural University, Ya'an, Sichuan 625014, People's Republic of China
| | - J L Huang
- Research Center of Fish Disease, Sichuan Agricultural University, Ya'an, Sichuan 625014, People's Republic of China
| | - G Y Xiao
- Research Center of Fish Disease, Sichuan Agricultural University, Ya'an, Sichuan 625014, People's Republic of China
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7
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Lewis GK. Live-attenuatedSalmonellaas a prototype vaccine vector for passenger immunogens in humans: are we there yet? Expert Rev Vaccines 2014; 6:431-40. [PMID: 17542757 DOI: 10.1586/14760584.6.3.431] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
It has been nearly 20 years since the first Phase I clinical trial of a live-attenuated bacterial vaccine was created by recombinant DNA methods, opening the door to the use of these organisms as mucosal delivery vehicles for passenger antigens. Over this time, a number of animal studies have indicated the feasibility of this approach. These include studies showing that bacteria can deliver antigens expressed by the bacterium itself and that bacteria can deliver DNA vaccines to be expressed in target eukaryotic cells. Concomitant studies have identified a number of attenuating mutations that render the bacterial vectors both safe and immunogenic in humans. Both avenues of research indicate the significant promise of this approach to mucosal vaccine development; however, this promise remains largely unrealized at the level of human clinical trials. This review sketches the history of this problem and points toward possible solutions using Salmonella vaccine vectors as the prototypes.
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Affiliation(s)
- George K Lewis
- Division of Basic Science and Vaccine Research, Institute of Human Virology, University of Maryland Biotechnology Institute and University of Maryland Baltimore, 725 W. Lombard Street, Baltimore, MD 21218, USA.
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8
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Yan Y, Mu W, Zhang L, Guan L, Liu Q, Zhang Y. Asd-based balanced-lethal system in attenuated Edwardsiella tarda to express a heterologous antigen for a multivalent bacterial vaccine. FISH & SHELLFISH IMMUNOLOGY 2013; 34:1188-1194. [PMID: 23454428 DOI: 10.1016/j.fsi.2013.01.027] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2012] [Revised: 12/31/2012] [Accepted: 01/28/2013] [Indexed: 06/01/2023]
Abstract
Edwardsiella tarda is an enteric Gram-negative invasive intracellular pathogen, which causes enteric septicemia in fish. It could be potentially used to develop a recombinant attenuated E. tarda vaccine for the aquaculture industry. Because live vaccine strains can potentially be released into the environment upon vaccination, medical and environmental safety issues must be considered. Deletion of the asdB gene in E. tarda resulted in a diaminopimelic acid (DAP)-dependent mutant. The wild type asdB gene was inserted in place of the antibiotic-resistance gene in the plasmid, and the resultant non-antibiotic resistant vector was transformed into the attenuated and DAP-dependent E. tarda vaccine strain (WEDΔasdB) to obtain a balanced-lethal system for heterologous antigen expression. The balanced-lethal expression system was further optimized by comparing plasmid replicons with different Shine-Dalgarno sequences and start codons for the asdB gene. Utilizing the optimized balanced-lethal expression system, the protective antigen gene gapA34 from the fish pathogen Aeromonas hydrophila LSA34 was expressed in the attenuated E. tarda to generate the multivalent vaccine candidate WEDΔasdB/pUTta4DGap. This vaccine was shown to evoke an effective immune response against both E. tarda and A. hydrophila LSA34 by vaccinating turbot via a simple immersion route. This multivalent E. tarda vector vaccine has great potential for broad applications in aquaculture.
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Affiliation(s)
- Yijian Yan
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, 130 Meilong Rd., Shanghai 200237, PR China
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9
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Jang JI, Kim JS, Eom JS, Kim HG, Kim BH, Lim S, Bang IS, Park YK. Expression and delivery of tetanus toxin fragment C fused to the N-terminal domain of SipB enhances specific immune responses in mice. Microbiol Immunol 2013; 56:595-604. [PMID: 22708880 DOI: 10.1111/j.1348-0421.2012.00480.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Live attenuated bacteria can be used as a carrier for the delivery of foreign antigens to a host's immune system. The N-terminal domain of SipB, a translocon protein of the type III secretion system of Salmonella enterica serovar Typhimurium, is required for secretion and outer membrane localization. In the present study, vaccine plasmids for antigen delivery in which the non-toxic tetanus toxin fragment C (TTFC), which contains a T cell epitope, is fused to the N-terminal 160 amino acids of SipB were developed. It was found that the recombinant proteins are secreted into the culture media and localized to the bacterial surface. TTFC-specific antibody responses are significantly increased in mice orally immunized with attenuated S. Typhimurium BRD509 strains carrying TTFC delivery plasmids. When the TTFC delivery cassettes were introduced into a low copy vector, the plasmid was stably maintained in the BRD509 strain and induced an immune response to the TTFC antigen in mice. These results suggest that expression and delivery of heterologous antigens fused to the N-terminus of SipB enhance the induction of antigen-specific immune responses, and that the N-terminal domain of SipB can be used as a versatile delivery system for foreign antigens.
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Affiliation(s)
- Jung Im Jang
- School of Life Sciences and Biotechnology, Korea University, Seoul 136-701, Korea
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10
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Zheng Y, Xiao Y, Wu H, Wang Q, Xiao J, Zhang Y, Liu Q. Different approaches to expressing Edwardsiella tarda antigen GAPDH in attenuated Vibrio anguillarum for multivalent fish vaccines. JOURNAL OF FISH DISEASES 2012; 35:569-577. [PMID: 22724428 DOI: 10.1111/j.1365-2761.2012.01381.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
With the development of gene technology, expressing heterologous antigens in attenuated bacteria has become an important strategy to design multivalent vaccines. In our previous work, an attenuated Vibrio anguillarum named MVAV6203 was developed and proven to be an efficient live vaccine candidate. In this research, we aimed to express protective antigen glyceraldehyde-3-phosphate dehydrogenase (GAPDH) of Edwardsiella tarda in attenuated Vibrio anguillarum to establish a multivalent V. anguillarum vector vaccine. Several strategies were compared between low- vs. high-copy plasmid-mediated antigen expression, in vivo-inducible vs. constitutive antigen expression and intracellular vs. surface-displaying antigen expression. Zebrafish, Danio rerio (Hamilton), was applied as the fish model to evaluate the immune protection of the V. anguillarum vector vaccine candidates. Our results demonstrated that V. anguillarum MVAV6203 (pUTatLNG40), which harbours a low-copy plasmid-loaded antigen surface display system under the control of a constitutive promoter, presented the best protective efficacy against the infection of Vibrio anguillarum (relative per cent survival, RPS = 85%) and Edwardsiella tarda (RPS = 70%).
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Affiliation(s)
- Y Zheng
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, China
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11
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Xu XG, Zhao HN, Zhang Q, Ding L, Li ZC, Li W, Wu HY, Chuang KP, Tong DW, Liu HJ. Oral vaccination with attenuated Salmonella enterica serovar Typhimurium expressing Cap protein of PCV2 and its immunogenicity in mouse and swine models. Vet Microbiol 2012; 157:294-303. [PMID: 22326539 DOI: 10.1016/j.vetmic.2012.01.008] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2011] [Revised: 12/24/2011] [Accepted: 01/10/2012] [Indexed: 11/27/2022]
Abstract
Attenuated Salmonella enterica serovar Typhimurium (S. typhimurium) was selected as a transgenic vehicle for the development of oral vaccines against Porcine circovirus type 2 (PCV2). The Cap-encoding gene of PCV2 was amplified by PCR and cloned into expression vector pYA3341. The recombinant plasmid pYA3341-Cap was transformed into attenuated S. typhimurium X4550. BALB/c mice were inoculated orally with various doses of attenuated S. typhimurium X4550/pYA3341-Cap. The bacterium was safe to mice at dose of 2×10(9)cfu and eventually eliminated in the spleen and mesenteric lymph nodes at 4 weeks post-immunization. The flow cytometry analysis showed that the percentage of CD4(+) T cells and CD4(+)/CD8(+) ratio were increased significantly in mice immunized with attenuated S. typhimurium X4550/pYA3341-Cap. Vaccine tests in swine showed that the oral immunization with attenuated S. typhimurium X4550/pYA3341-Cap could elicit significantly higher Cap antibody titers in the treated swine than the control groups. Virus neutralization test showed that serum from the swine treated with attenuated S. typhimurium X4550/pYA3341-Cap had significant levels of neutralization activities. The swine lymphocyte proliferative responses indicated that attenuated S. typhimurium X4550/pYA3341-Cap could induce obvious cellular immune response. An in vivo challenge study showed the swine treated with attenuated S. typhimurium X4550/pYA3341-Cap had significantly lower PCV2-associated lesions and PCV2 viremia than the control groups. The results indicated that attenuated S. typhimurium X4550/pYA3341-Cap can be a potential vaccine against PCV2 infections.
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Affiliation(s)
- Xin-Gang Xu
- College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi 712100, PR China
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Chen J, Yang B, Cheng X, Qiao Y, Tang B, Chen G, Wei J, Liu X, Cheng W, Du P, Huang X, Jiang W, Hu Q, Hu Y, Li J, Hua ZC. Salmonella-mediated tumor-targeting TRAIL gene therapy significantly suppresses melanoma growth in mouse model. Cancer Sci 2011; 103:325-33. [DOI: 10.1111/j.1349-7006.2011.02147.x] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
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Mu W, Guan L, Yan Y, Liu Q, Zhang Y. A novel in vivo inducible expression system in Edwardsiella tarda for potential application in bacterial polyvalence vaccine. FISH & SHELLFISH IMMUNOLOGY 2011; 31:1097-1105. [PMID: 21964456 DOI: 10.1016/j.fsi.2011.09.015] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2011] [Revised: 08/20/2011] [Accepted: 09/19/2011] [Indexed: 05/31/2023]
Abstract
Recombinant bacterial vector vaccine is an attractive vaccination strategy to induce the immune response to a carried protective antigen, and the main concern of bacterial vector vaccine is to establish a stable antigen expression system in vector bacteria. Edwardsiella tarda is an important facultative intracellular pathogen of both animals and humans, and its attenuated derivates are excellent bacterial vectors for use in recombinant vaccine design. In this study, we design an in vivo inducible expression system in E. tarda and establish potential recombinant E. tarda vector vaccines. With wild type strain E. tarda EIB202 as a vector, 53 different bacteria-originated promoters were examined for iron-responsive transcription in vitro, and the promoters P(dps) and P(yncE) showed high transcription activity. The transcription profiles in vivo of two promoters were further assayed, and P(dps) revealed an enhanced in vivo inducible transcription in macrophage, larvae and adult zebra fish. The gapA34 gene, encoding the protective antigen GAPDH from the fish pathogen Aeromonas hydrophila LSA34, was introduced into the P(dps)-based protein expression system, and transformed into attenuated E. tarda strains. The resultant recombinant vector vaccine WED/pUTDgap was evaluated in turbot (Scophtalmus maximus). Over 60% of the vaccinated fish survived under the challenge with A. hydrophila LSA34 and E. tarda EIB202, suggesting that the P(dps)-based antigen delivery system had great potential in bacterial vector vaccine application.
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Affiliation(s)
- Wei Mu
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, PR China
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A stable plasmid system for heterologous antigen expression in attenuated Vibrio anguillarum. Vaccine 2011; 29:6986-93. [PMID: 21791231 DOI: 10.1016/j.vaccine.2011.07.036] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2011] [Revised: 06/16/2011] [Accepted: 07/11/2011] [Indexed: 11/21/2022]
Abstract
To stably synthesize heterologous protein in an attenuated Vibrio anguillarum strain (MVAV6203) for potential multivalent live vaccine application, plasmids with different replicons were used to construct protein expression systems in this work. The gfp fragment under control of a strict low-iron-regulated promoter P(viua) was inserted into seven plasmids with varied replicons derived from pAT153, pACYC184, pBBR1, pEC, pMW118, pRK2, and pSC101, to generate seven corresponding plasmids. Our results revealed that the plasmid pUTat with the replicon from pAT153 was retained by 100% of the host cells and mediated stable expression of heterologous protein in antibiotic-free medium within 250 generations. Further analyses in animal model (zebrafish larvae) demonstrated that the constructed plasmid pUTat was well retained by bacteria and continuously expressed GFP in vivo in zebrafish. The gapA40 gene, encoding Glyceraldehyde-3-phosphate dehydrogenase from the fish pathogen Edwardsiella tarda, was introduced into the pUTat-based protein expression system, and transformed into V. anguillarum MVAV6203. The resultant recombinant vector vaccine 6203/pUTatgap was evaluated in turbot (Scophtalmus maximus). After 30 days post vaccination, the fish showed an increased survival ratio by 80% and 67% under the challenge of wild V. anguillarum and E. tarda, respectively. Our results suggested that the pUTat-based antigen expression system had great potential with its efficiency and stability in the design of bacterial vector vaccine.
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Chen J, Wei D, Zhuang H, Qiao Y, Tang B, Zhang X, Wei J, Fang S, Chen G, Du P, Huang X, Jiang W, Hu Q, Hua ZC. Proteomic screening of anaerobically regulated promoters from Salmonella and its antitumor applications. Mol Cell Proteomics 2011; 10:M111.009399. [PMID: 21474796 DOI: 10.1074/mcp.m111.009399] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Solid tumors often contain hypoxic and necrotic areas that can be targeted by attenuated Salmonella typhimurium VNP20009 (VNP). We sought to develop a hypoxia- inducible promoter system based on the tumor-specific delivered strain VNP to confine expression of therapeutic gene specifically or selectively within the tumor microenvironment. A hypoxia-inducible promoter - adhE promoter was screened from the hypoxia-regulated endogenous proteins of Salmonella through two-dimensional gel electrophoresis and matrix-assisted laser desorption ionization-time-of-flight/time-of-flight MS-based proteomics approaches. The efficiency and specificity of the selected adhE promoter were validated first in both bacteria and animal tumor models. The adhE promoter could specifically drive GFP gene expression under hypoxia, but not under normoxia. Furthermore, luciferase reporter expression controlled by the system was also confined to the tumors. Finally, we investigated the anticancer efficacy of VNP delivering human endostatin controlled by our adhE promoter system in both murine melanoma and Lewis lung carcinoma models. Our results demonstrated that by the dual effects of tumoricidal and anti-angiogenic activities, the recombinant Salmonella strain could generate enhanced antitumor effects compared with those of unarmed VNP treatment or untreated control. The recombinant VNP could retard tumor growth significantly and extend survival of tumor-bearing mice by inducing more apoptosis and more severe necrosis as well as inhibiting blood vessel density within tumors. Therefore, VNP carrying the endostatin gene under our tumor-targeted expression system holds promise for the treatment of solid tumors.
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Affiliation(s)
- Jianxiang Chen
- The State Key Laboratory of Pharmaceutical Biotechnology and School of Stomatology, Affiliated Stomatological Hospital, Nanjing University, Nanjing, P R China
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The treatment and prevention of mouse melanoma with an oral DNA vaccine carried by attenuated Salmonella typhimurium. J Immunother 2010; 33:453-60. [PMID: 20463603 DOI: 10.1097/cji.0b013e3181cf23a6] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Therapeutic vaccines of cancer are attractive for their capacity of breaking the immune tolerance and invoking long-term immune response targeting cancer cells without autoimmunity. An efficient antigen delivery system is the key issue of developing an effective cancer vaccine. Attenuated Salmonella typhimurium as the carrier of cancer vaccine are able to transfer DNA from the prokaryote to the eukaryote and preferentially replicate within the tumor tissue. Heat shock protein 70 delivers the tumor-associated antigens to antigen presenting cells through its polypeptide-binding domain and breaks immune tolerance of the cancer cells. Here we described a novel low-copy-number DNA vaccine based on the Hsp70-TAA complex and carried by the attenuated S. typhimurium strain SL3261. Oral administration of this vaccine elicited specific CTL-mediated lysis of the melanoma tumor cells and marked activation of the T-cells. The therapeutic vaccine effectively protected 57.1% C57BL/6J mice from lethal challenge with B16F10 melanoma tumor cells in prophylactic settings and eraicated 62.5% tumor growth in therapeutic settings. This approach may provide a new strategy for the prevention and treatment of cancer.
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Bacterial antigen expression is an important component in inducing an immune response to orally administered Salmonella-delivered DNA vaccines. PLoS One 2009; 4:e6062. [PMID: 19557169 PMCID: PMC2698147 DOI: 10.1371/journal.pone.0006062] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2009] [Accepted: 05/31/2009] [Indexed: 12/02/2022] Open
Abstract
Background The use of Salmonella to deliver heterologous antigens from DNA vaccines is a well-accepted extension of the success of oral Salmonella vaccines in animal models. Attenuated S. typhimurium and S. typhi strains are safe and efficacious, and their use to deliver DNA vaccines combines the advantages of both vaccine approaches, while complementing the limitations of each technology. An important aspect of the basic biology of the Salmonella/DNA vaccine platform is the relative contributions of prokaryotic and eukaryotic expression in production of the vaccine antigen. Gene expression in DNA vaccines is commonly under the control of the eukaryotic cytomegalovirus (CMV) promoter. The aim of this study was to identify and disable putative bacterial promoters within the CMV promoter and evaluate the immunogenicity of the resulting DNA vaccine delivered orally by S. typhimurium. Methodology/Principal Findings The results reported here clearly demonstrate the presence of bacterial promoters within the CMV promoter. These promoters have homology to the bacterial consensus sequence and functional activity. To disable prokaryotic expression from the CMV promoter a series of genetic manipulations were performed to remove the two major bacterial promoters and add a bacteria transcription terminator downstream of the CMV promoter. S. typhimurium was used to immunise BALB/c mice orally with a DNA vaccine encoding the C-fragment of tetanus toxin (TT) under control of the original or the modified CMV promoter. Although both promoters functioned equally well in eukaryotic cells, as indicated by equivalent immune responses following intramuscular delivery, only the original CMV promoter was able to induce an anti-TT specific response following oral delivery by S. typhimurium. Conclusions These findings suggest that prokaryotic expression of the antigen and co-delivery of this protein by Salmonella are at least partially responsible for the successful oral delivery of C-fragment DNA vaccines containing the CMV promoter by S. typhimurium.
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Abstract
Attenuated Salmonella Typhi vaccine strains hold great promise as live vectors for presentation of foreign antigens from unrelated bacterial, viral and parasitic pathogens to the immune system. Although this approach has proved quite successful in experimental animal models for eliciting antigen-specific mucosal, humoral and cellular responses, results have been disappointing for clinical trials carried out thus far. We hypothesize that the paucity of human responses to foreign antigens delivered by live vectors suggests that the strains and genetic approaches used to date have resulted in overattenuated vaccine strains with severely reduced immunogenicity. However, remarkable advances have now been made in the genetics of foreign antigen expression, understanding mechanisms of live vector immunity and refining immunization strategies. The time has now come for development of multivalent live vectors in which stable antigen expression and export is balanced with metabolic fitness to create highly immunogenic vaccines.
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Development of non-antibiotic-resistant, chromosomally based, constitutive and inducible expression systems for aroA-attenuated Salmonella enterica Serovar Typhimurium. Infect Immun 2009; 77:1817-26. [PMID: 19223478 DOI: 10.1128/iai.01301-08] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Live-vaccine delivery systems expressing two model antigens from Mycoplasma hyopneumoniae, F2(P97) (Adh) and NrdF, were constructed using Salmonella enterica serovar Typhimurium aroA (STM-1), and immunogenicity in mice was evaluated. Recombinant plasmid-based expression (PBE) and chromosomally based expression (CBE) systems were constructed. The PBE system was formed by cloning both antigen genes into pJLA507 to create an operon downstream of temperature-inducible promoters. Constitutive CBE was achieved using a promoter-trapping technique whereby the promoterless operon was stably integrated into the chromosome of STM-1, and the expression of antigens was assessed. The chromosomal position of the operon was mapped in four clones. Inducible CBE was obtained by using the in vivo-induced sspA promoter and recombining the expression construct into aroD. Dual expression of the antigens was detected in all systems, with PBE producing much larger quantities of both antigens. The stability of antigen expression after in vivo passage was 100% for all CBE strains recovered. PBE and CBE strains were selected for comparison in a vaccination trial. The vaccine strains were delivered orally into mice, and significant systemic immunoglobulin M (IgM) and IgG responses against both antigens were detected among all CBE groups. No significant immune response was detected using PBE strains. Expression of recombinant antigens in S. enterica serovar Typhimurium aroA from chromosomally located strong promoters without the use of antibiotic resistance markers is a reliable and effective method of inducing a significant immune response.
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Ning JF, Zhu W, Xu JP, Zheng CY, Meng XL. Oral delivery of DNA vaccine encoding VP28 against white spot syndrome virus in crayfish by attenuated Salmonella typhimurium. Vaccine 2008; 27:1127-35. [PMID: 19071178 DOI: 10.1016/j.vaccine.2008.11.075] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2008] [Revised: 11/06/2008] [Accepted: 11/13/2008] [Indexed: 10/21/2022]
Abstract
Protective immune responses in shrimp induced by DNA vaccines against white spot syndrome virus (WSSV) with intramuscular injection have been reported in recent reports. In this study, we investigated the utilities of attenuated Salmonella enterica serovar Typhimurium (Salmonella typhimurium) as a bactofection vehicle for the oral delivery of a DNA vaccine plasmid to crayfish (Cambarus clarkii). The DNA vaccine plasmid pcDNA3.1-VP28, encoding viral envelope protein VP28, was transformed to an attenuated S. typhimurium strain SV4089 and the resulting recombinant bacteria named SV/pcDNA3.1-VP28 were used to orally immunize crayfish with coated feed. Successful delivery of the DNA vaccine plasmid was shown by the isolation of recombinant bacteria SV/pcDNA3.1-VP28 from the vaccinated crayfish. The distribution analysis of plasmid pcDNA3.1-VP28 in different tissues revealed the effective release of DNA vaccine plasmid into crayfish. RT-PCR and immunoflurescence results confirmed the expression of protein VP28 in the vaccinated crayfish. Challenge experiments with WSSV at 7, 15, 25 days post-vaccination demonstrated significant protection in immunized crayfish with relative survival rate 83.3%, 66.7% and 56.7%, respectively. Studies on stability and safety of SV/pcDNA3.1-VP28 showed the recombinant bacteria could exist in crayfish at least 7 days but not more than 10 days and without any observable harm to the host. Our study here demonstrates, for the first time, the ability of attenuated Salmonella as a live vector to orally deliver a DNA vaccine against WSSV into the arthropod crayfish and provides a new way to design more practical strategies for the control of WSSV and other invertebrate pathogens.
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Affiliation(s)
- Jian-Fang Ning
- State Key Laboratory of Virology, College of Life Sciences, Wuhan University, Wuhan, PR China
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Impact of prior immunological exposure on vaccine delivery by Salmonella enterica serovar Typhimurium. Vaccine 2008; 26:6212-20. [DOI: 10.1016/j.vaccine.2008.09.060] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2008] [Accepted: 09/15/2008] [Indexed: 11/30/2022]
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