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Dai P, Wu H, Ding G, Fan J, Li Y, Li S, Bao E, Li Y, Gao X, Li H, Zhu C, Zhu G. Recombinant Salmonella gallinarum ( S. gallinarum) Vaccine Candidate Expressing Avian Pathogenic Escherichia coli Type I Fimbriae Provides Protections against APEC O78 and O161 Serogroups and S. gallinarum Infection. Vaccines (Basel) 2023; 11:1778. [PMID: 38140181 PMCID: PMC10747928 DOI: 10.3390/vaccines11121778] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2023] [Revised: 11/19/2023] [Accepted: 11/23/2023] [Indexed: 12/24/2023] Open
Abstract
Avian pathogenic Escherichia coli (APEC) is one of the leading pathogens that cause devastating economic losses to the poultry industry. Type I fimbriae are essential adhesion factors of APEC, which can be targeted and developed as a vaccine candidate against multiple APEC serogroups due to their excellent immunogenicity and high homology. In this study, the recombinant strain SG102 was developed by expressing the APEC type I fimbriae gene cluster (fim) on the cell surface of an avirulent Salmonella gallinarum (S. gallinarum) vector strain using a chromosome-plasmid-balanced lethal system. The expression of APEC type I fimbriae was verified by erythrocyte hemagglutination assays and antigen-antibody agglutination tests. In vitro, the level of the SG102 strain adhering to leghorn male hepatoma (LMH) cells was significantly higher than that of the empty plasmid control strain, SG101. At two weeks after oral immunization, the SG102 strain remained detectable in the livers, spleens, and ceca of SG102-immunized chickens, while the SG101 strain was eliminated in SG101-immunized chickens. At 14 days after the secondary immunization with 5 × 109 CFU of the SG102 strain orally, highly antigen-specific humoral and mucosal immune responses against APEC type I fimbriae protein were detected in SG102-immunized chickens, with IgG and secretory IgA (sIgA) concentrations of 221.50 μg/mL and 1.68 μg/mL, respectively. The survival rates of SG102-immunized chickens were 65% (13/20) and 60% (12/20) after challenge with 50 LD50 doses of APEC virulent strains O78 and O161 serogroups, respectively. By contrast, 95% (19/20) and 100% (20/20) of SG101-immunized chickens died in challenge studies involving APEC O78 and O161 infections, respectively. In addition, the SG102 strain effectively provided protection against lethal challenges from the virulent S. gallinarum strain. These results demonstrate that the SG102 strain, which expresses APEC type I fimbriae, is a promising vaccine candidate against APEC O78 and O161 serogroups as well as S. gallinarum infections.
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Affiliation(s)
- Peng Dai
- Joint Laboratory of International Cooperation on Prevention and Control Technology of Important Animal Diseases and Zoonoses of Jiangsu Higher Education Institutions, Yangzhou University, Yangzhou 225012, China;
- College of Veterinary Medicine, Yangzhou University, Yangzhou 225012, China
- Yangzhou Uni-Bio Pharmaceutical Co., Ltd., Yangzhou 225008, China; (G.D.); (J.F.); (Y.L.)
| | - Hucong Wu
- Nei Monggol Animal Disease Control Center, Hohhot 010010, China;
| | - Guowei Ding
- Yangzhou Uni-Bio Pharmaceutical Co., Ltd., Yangzhou 225008, China; (G.D.); (J.F.); (Y.L.)
| | - Juan Fan
- Yangzhou Uni-Bio Pharmaceutical Co., Ltd., Yangzhou 225008, China; (G.D.); (J.F.); (Y.L.)
| | - Yuhe Li
- Yangzhou Uni-Bio Pharmaceutical Co., Ltd., Yangzhou 225008, China; (G.D.); (J.F.); (Y.L.)
| | - Shoujun Li
- Tianjin Ringpu Bio-Technology Co., Ltd., Tianjin 300308, China; (S.L.); (E.B.); (Y.L.); (X.G.)
| | - Endong Bao
- Tianjin Ringpu Bio-Technology Co., Ltd., Tianjin 300308, China; (S.L.); (E.B.); (Y.L.); (X.G.)
| | - Yajie Li
- Tianjin Ringpu Bio-Technology Co., Ltd., Tianjin 300308, China; (S.L.); (E.B.); (Y.L.); (X.G.)
| | - Xiaolei Gao
- Tianjin Ringpu Bio-Technology Co., Ltd., Tianjin 300308, China; (S.L.); (E.B.); (Y.L.); (X.G.)
| | - Huifang Li
- Jiangsu Institute of Poultry Sciences, Yangzhou 225125, China; (H.L.); (C.Z.)
| | - Chunhong Zhu
- Jiangsu Institute of Poultry Sciences, Yangzhou 225125, China; (H.L.); (C.Z.)
| | - Guoqiang Zhu
- Joint Laboratory of International Cooperation on Prevention and Control Technology of Important Animal Diseases and Zoonoses of Jiangsu Higher Education Institutions, Yangzhou University, Yangzhou 225012, China;
- College of Veterinary Medicine, Yangzhou University, Yangzhou 225012, China
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Avian Pathogenic Escherichia coli (APEC): An Overview of Virulence and Pathogenesis Factors, Zoonotic Potential, and Control Strategies. Pathogens 2021; 10:pathogens10040467. [PMID: 33921518 PMCID: PMC8069529 DOI: 10.3390/pathogens10040467] [Citation(s) in RCA: 113] [Impact Index Per Article: 37.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Revised: 04/05/2021] [Accepted: 04/09/2021] [Indexed: 02/07/2023] Open
Abstract
Avian pathogenic Escherichia coli (APEC) causes colibacillosis in avian species, and recent reports have suggested APEC as a potential foodborne zoonotic pathogen. Herein, we discuss the virulence and pathogenesis factors of APEC, review the zoonotic potential, provide the current status of antibiotic resistance and progress in vaccine development, and summarize the alternative control measures being investigated. In addition to the known virulence factors, several other factors including quorum sensing system, secretion systems, two-component systems, transcriptional regulators, and genes associated with metabolism also contribute to APEC pathogenesis. The clear understanding of these factors will help in developing new effective treatments. The APEC isolates (particularly belonging to ST95 and ST131 or O1, O2, and O18) have genetic similarities and commonalities in virulence genes with human uropathogenic E. coli (UPEC) and neonatal meningitis E. coli (NMEC) and abilities to cause urinary tract infections and meningitis in humans. Therefore, the zoonotic potential of APEC cannot be undervalued. APEC resistance to almost all classes of antibiotics, including carbapenems, has been already reported. There is a need for an effective APEC vaccine that can provide protection against diverse APEC serotypes. Alternative therapies, especially the virulence inhibitors, can provide a novel solution with less likelihood of developing resistance.
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Han Y, Luo P, Chen Y, Xu J, Sun J, Guan C, Wang P, Chen M, Zhang X, Zhu Y, Zhu T, Zhai R, Cheng C, Song H. Regulated delayed attenuation improves vaccine efficacy in preventing infection from avian pathogenic Escherichia coli O 78 and Salmonella typhimurium. Vet Microbiol 2021; 254:109012. [PMID: 33611126 DOI: 10.1016/j.vetmic.2021.109012] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2020] [Accepted: 02/03/2021] [Indexed: 10/22/2022]
Abstract
Avian pathogenic Escherichia coli (APEC) O78 and Salmonella typhimurium (S. Typhimurium) are two leading bacterial pathogens that cause significant economic loss in the poultry industry. O-antigen is an important immunogen of these two bacteria to induce host protective immune responses during infection. To develop a bivalent vaccine against APEC O78 and S. Typhimurium, the attenuated Salmonella ST01 (Δasd ΔrfbP Δcrp) was genetically constructed to deliver APEC O78 O-antigen polysaccharide (OPS), which stably expresses OPS with asd+ balanced-lethal system in vitro and in vivo. After oral immunization, the recombinant attenuated Salmonella vaccine (RASV) strain ST01 (pSS26-O78) provided insufficient protection against the APEC O78 challenge. Therefore, the regulated delayed attenuation strain ST02 (Δasd ΔrfbP ΔPcrp::TTaraC PBADcrp) was further constructed by regulating cyclic AMP receptor protein (crp) with araC PBAD cassette to better present the heterologous O-antigen to the host immune system. The innovative recombinant strain ST02 (pSS26-O78) stimulated robust antibody responses against APEC O78 and S. Typhimurium OPS, with serum titers over 1:800 for both IgG and IgA, thereby providing the complement-mediated bactericidal activity and stronger protection against APEC O78 and S. Typhimurium infection. Collectively, this study demonstrates a biologically-conjugated polysaccharide vaccine candidate that can enhance homologous protection against APEC O78 and S. Typhimurium.
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Affiliation(s)
- Yue Han
- China-Australian Joint Laboratory for Animal Health Big Data Analytics, Zhejiang Provincial Engineering Laboratory for Animal Health Inspection and Internet Technology, College of Animal Science and Technology, College of Veterinary Medicine of Zhejiang A&F University, Lin'an, China
| | - Ping Luo
- China-Australian Joint Laboratory for Animal Health Big Data Analytics, Zhejiang Provincial Engineering Laboratory for Animal Health Inspection and Internet Technology, College of Animal Science and Technology, College of Veterinary Medicine of Zhejiang A&F University, Lin'an, China
| | - Yuji Chen
- China-Australian Joint Laboratory for Animal Health Big Data Analytics, Zhejiang Provincial Engineering Laboratory for Animal Health Inspection and Internet Technology, College of Animal Science and Technology, College of Veterinary Medicine of Zhejiang A&F University, Lin'an, China
| | - Jiali Xu
- China-Australian Joint Laboratory for Animal Health Big Data Analytics, Zhejiang Provincial Engineering Laboratory for Animal Health Inspection and Internet Technology, College of Animal Science and Technology, College of Veterinary Medicine of Zhejiang A&F University, Lin'an, China
| | - Jing Sun
- China-Australian Joint Laboratory for Animal Health Big Data Analytics, Zhejiang Provincial Engineering Laboratory for Animal Health Inspection and Internet Technology, College of Animal Science and Technology, College of Veterinary Medicine of Zhejiang A&F University, Lin'an, China
| | - Chiyu Guan
- China-Australian Joint Laboratory for Animal Health Big Data Analytics, Zhejiang Provincial Engineering Laboratory for Animal Health Inspection and Internet Technology, College of Animal Science and Technology, College of Veterinary Medicine of Zhejiang A&F University, Lin'an, China
| | - Pu Wang
- China-Australian Joint Laboratory for Animal Health Big Data Analytics, Zhejiang Provincial Engineering Laboratory for Animal Health Inspection and Internet Technology, College of Animal Science and Technology, College of Veterinary Medicine of Zhejiang A&F University, Lin'an, China
| | - Mianmian Chen
- China-Australian Joint Laboratory for Animal Health Big Data Analytics, Zhejiang Provincial Engineering Laboratory for Animal Health Inspection and Internet Technology, College of Animal Science and Technology, College of Veterinary Medicine of Zhejiang A&F University, Lin'an, China
| | - Xian Zhang
- China-Australian Joint Laboratory for Animal Health Big Data Analytics, Zhejiang Provincial Engineering Laboratory for Animal Health Inspection and Internet Technology, College of Animal Science and Technology, College of Veterinary Medicine of Zhejiang A&F University, Lin'an, China
| | - Yueyue Zhu
- China-Australian Joint Laboratory for Animal Health Big Data Analytics, Zhejiang Provincial Engineering Laboratory for Animal Health Inspection and Internet Technology, College of Animal Science and Technology, College of Veterinary Medicine of Zhejiang A&F University, Lin'an, China
| | - Tingting Zhu
- China-Australian Joint Laboratory for Animal Health Big Data Analytics, Zhejiang Provincial Engineering Laboratory for Animal Health Inspection and Internet Technology, College of Animal Science and Technology, College of Veterinary Medicine of Zhejiang A&F University, Lin'an, China
| | - Ruidong Zhai
- China-Australian Joint Laboratory for Animal Health Big Data Analytics, Zhejiang Provincial Engineering Laboratory for Animal Health Inspection and Internet Technology, College of Animal Science and Technology, College of Veterinary Medicine of Zhejiang A&F University, Lin'an, China
| | - Changyong Cheng
- China-Australian Joint Laboratory for Animal Health Big Data Analytics, Zhejiang Provincial Engineering Laboratory for Animal Health Inspection and Internet Technology, College of Animal Science and Technology, College of Veterinary Medicine of Zhejiang A&F University, Lin'an, China.
| | - Houhui Song
- China-Australian Joint Laboratory for Animal Health Big Data Analytics, Zhejiang Provincial Engineering Laboratory for Animal Health Inspection and Internet Technology, College of Animal Science and Technology, College of Veterinary Medicine of Zhejiang A&F University, Lin'an, China.
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Nishi N, Seki K, Takahashi D, Toshima K. Synthesis of a Pentasaccharide Repeating Unit of Lipopolysaccharide Derived from Virulent E. coli O1 and Identification of a Glycotope Candidate of Avian Pathogenic E. coli O1. Angew Chem Int Ed Engl 2021; 60:1789-1796. [PMID: 33124093 DOI: 10.1002/anie.202013729] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2020] [Indexed: 12/13/2022]
Abstract
Avian pathogenic Escherichia coli (APEC) is a common bacterial pathogen infecting chickens, resulting in economic losses to the poultry industry worldwide. In particular, APEC O1, one of the most common serotypes of APEC, is considered problematic due to its zoonotic potential. Therefore, many attempts have been made to develop an effective vaccine against APEC O1. In fact, the lipopolysaccharide (LPS) O-antigen of APEC O1 has been shown to be a potent antigen for inducing specific protective immune responses. However, the detailed structure of the O-antigen of APEC O1 is not clear. The present study demonstrates the first synthesis of a pentasaccharide repeating unit of LPS derived from virulent E. coli O1 and its conjugate with BSA. ELISA tests using the semi-synthetic glycoconjugate and the APEC O1 immune chicken serum revealed that the pentasaccharide is a glycotope candidate of APEC O1, with great potential as an antigen for vaccine development.
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Affiliation(s)
- Nobuya Nishi
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, 223-8522, Japan
| | - Katsunori Seki
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, 223-8522, Japan
| | - Daisuke Takahashi
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, 223-8522, Japan
| | - Kazunobu Toshima
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, 223-8522, Japan
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Nishi N, Seki K, Takahashi D, Toshima K. Synthesis of a Pentasaccharide Repeating Unit of Lipopolysaccharide Derived from Virulent
E. coli
O1 and Identification of a Glycotope Candidate of Avian Pathogenic
E. coli
O1. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202013729] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Nobuya Nishi
- Department of Applied Chemistry Faculty of Science and Technology Keio University 3-14-1 Hiyoshi, Kohoku-ku Yokohama 223-8522 Japan
| | - Katsunori Seki
- Department of Applied Chemistry Faculty of Science and Technology Keio University 3-14-1 Hiyoshi, Kohoku-ku Yokohama 223-8522 Japan
| | - Daisuke Takahashi
- Department of Applied Chemistry Faculty of Science and Technology Keio University 3-14-1 Hiyoshi, Kohoku-ku Yokohama 223-8522 Japan
| | - Kazunobu Toshima
- Department of Applied Chemistry Faculty of Science and Technology Keio University 3-14-1 Hiyoshi, Kohoku-ku Yokohama 223-8522 Japan
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Dow JM, Mauri M, Scott TA, Wren BW. Improving protein glycan coupling technology (PGCT) for glycoconjugate vaccine production. Expert Rev Vaccines 2020; 19:507-527. [DOI: 10.1080/14760584.2020.1775077] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Jennifer Mhairi Dow
- Department of Infection Biology, London School of Hygiene & Tropical Medicine, London, UK
| | - Marta Mauri
- Department of Infection Biology, London School of Hygiene & Tropical Medicine, London, UK
| | | | - Brendan William Wren
- Department of Infection Biology, London School of Hygiene & Tropical Medicine, London, UK
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7
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Zhao N, Lv J, Lu Y, Jiang Y, Li H, Liu Y, Zhang X, Zhao X. Prolonging and enhancing the protective efficacy of the EtMIC3-C-MAR against eimeria tenella through delivered by attenuated salmonella typhimurium. Vet Parasitol 2020; 279:109061. [PMID: 32143014 DOI: 10.1016/j.vetpar.2020.109061] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2019] [Revised: 02/20/2020] [Accepted: 02/23/2020] [Indexed: 01/09/2023]
Abstract
The microneme adhesive repeats (MAR) of Eimeria tenella microneme protein 3 (EtMIC3) are associated with binding to and invasion of host cells. Adhesion and invasion-related proteins or domains are often strongly immunogenic, immune responses mounted against these factors that play a key role in blocking invasion. In the present study, an oral live vaccine consisting of attenuated Salmonella typhimurium X4550 carrying two MAR domains fragment (St-X4550-MAR) was constructed and its protective efficacies were evaluated. The results showed that St-X4550-MAR was more immunogenic and conferred a higher degree of protection than recombinant MAR polypeptide as reflected by increased body weight, decreased oocyst shedding and lesion scores, increased serum IgG and cecal sIgA antibody production, and increasing levels of interferon-γ and interleukin-10. Thus, MAR domains are highly immunogenic and St-X4550-MAR had moderate activity against E. tenella infection by stimulating humoral, mucosal and cellular immunity. Chickens immunized with our constructed live vaccine provided considerable protections as early as at 10 d post-immunization (ACI: 155.17), and maintained higher protection levels at 20 d post-immunization (ACI: 173.66), and at 30 d post-immunization (ACI: 162.4). While the protective efficacy of chickens immunized with the recombinant MAR peptides showed a decreased trend as the post immunization time prolonging. Thus, using live-attenuated S. typhimurium X4550 as a vaccine expression and delivery system can significantly improve the protective efficacy and duration of protective immunity of MAR of EtMIC3.
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Affiliation(s)
- Ningning Zhao
- Department of Preventive Veterinary Medicine, College of Veterinary Medicine, Shandong Agricultural University, Taian City, Shandong Province, China
| | - Junfeng Lv
- Department of Preventive Veterinary Medicine, College of Veterinary Medicine, Shandong Agricultural University, Taian City, Shandong Province, China
| | - Yaru Lu
- Department of Preventive Veterinary Medicine, College of Veterinary Medicine, Shandong Agricultural University, Taian City, Shandong Province, China
| | - Yingying Jiang
- Department of Preventive Veterinary Medicine, College of Veterinary Medicine, Shandong Agricultural University, Taian City, Shandong Province, China
| | - Hongmei Li
- Department of Preventive Veterinary Medicine, College of Veterinary Medicine, Shandong Agricultural University, Taian City, Shandong Province, China
| | - Yumin Liu
- Shandong Huamutianyuan Agriculture and Animal Husbandry Co., Ltd., 1 Gangxing 3 Road, Jinan, Shandong Province, 250101, China
| | - Xiao Zhang
- Department of Preventive Veterinary Medicine, College of Veterinary Medicine, Shandong Agricultural University, Taian City, Shandong Province, China.
| | - Xiaomin Zhao
- Department of Preventive Veterinary Medicine, College of Veterinary Medicine, Shandong Agricultural University, Taian City, Shandong Province, China; Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, Shandong Agricultural University, Taian City, Shandong Province, China; Shandong Provincial Engineering Technology Research Center of Animal Disease Control and Prevention, Shandong Agricultural University, 61 Daizong Street, Taian City, Shandong Province, 271018, China.
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Stromberg ZR, Van Goor A, Redweik GAJ, Mellata M. Characterization of Spleen Transcriptome and Immunity Against Avian Colibacillosis After Immunization With Recombinant Attenuated Salmonella Vaccine Strains. Front Vet Sci 2018; 5:198. [PMID: 30186843 PMCID: PMC6113917 DOI: 10.3389/fvets.2018.00198] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2018] [Accepted: 07/30/2018] [Indexed: 01/19/2023] Open
Abstract
Avian pathogenic Escherichia coli (APEC) causes extraintestinal infections in poultry. Vaccines targeting APEC in chickens have been partially successful, but many lack heterologous protection. Recombinant attenuated Salmonella vaccine (RASV) strains can induce broad immunity against Salmonella and be modified to deliver E. coli antigens. Along with vaccine characteristics, understanding the host response is crucial for developing improved vaccines. The objectives of this study were to evaluate host responses to vaccination with an RASV producing E. coli common pilus (ECP) and assess protection against APEC infection in chickens. Four-day-old White Leghorn chickens were unvaccinated or orally vaccinated and boosted 2 weeks later with RASV χ8025(pYA3337), RASV χ8025(pYA4428) carrying ecp operon genes, or a combination of χ8025(pYA3337) and χ8025(pYA4428) (Combo). To assess host responses, serum IgY and intestinal IgA antibody titers were measured, and spleen samples (n = 4/group) were collected from unvaccinated and Combo vaccinated 4-week-old chickens for RNA-seq. Vaccine protection potential against Salmonella and APEC was evaluated in vitro using bacterial inhibition assays. Five-week-old chickens were challenged via air sac with either an APEC O2 or O78 strain. E. coli was enumerated from internal organs, and gross colibacillosis lesions were scored at necropsy. RASV immunized chickens elicited anti-E. coli antibodies. The spleen transcriptome revealed that 93% (89/96) of differentially expressed genes (DEG) were more highly expressed in Combo vaccinated compared to unvaccinated chickens, with signal as the most significantly impacted category. RNA-seq analysis also revealed altered cellular and metabolic processes, response to stimulus after vaccination, and immune system processes. Six DEG including genes linked to transcription regulation, actin cytoskeleton, and signaling were highly positively correlated with antibody levels. Samples from RASV immunized chickens showed protection potential against Salmonella strains using in vitro assays, but a variable response was found for APEC strains. After APEC challenges, significant differences were not detected for bacterial loads or gross lesions scores, but χ8025(pYA3337) immunized and χ8025(pYA4428) immunized chickens had significantly fewer number of APEC-O2-positive samples than unvaccinated chickens. This study shows that RASVs can prime the immune system for APEC infection, and is a first step toward developing improved therapeutics for APEC infections in chickens.
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Affiliation(s)
- Zachary R Stromberg
- Department of Food Science and Human Nutrition, Iowa State University, Ames, IA, United States
| | - Angelica Van Goor
- Department of Food Science and Human Nutrition, Iowa State University, Ames, IA, United States
| | - Graham A J Redweik
- Department of Food Science and Human Nutrition, Iowa State University, Ames, IA, United States
| | - Melha Mellata
- Department of Food Science and Human Nutrition, Iowa State University, Ames, IA, United States
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Han Y, Liu Q, Willias S, Liang K, Li P, Cheng A, Kong Q. A bivalent vaccine derived from attenuated Salmonella expressing O-antigen polysaccharide provides protection against avian pathogenic Escherichia coli O1 and O2 infection. Vaccine 2018; 36:1038-1046. [PMID: 29358057 DOI: 10.1016/j.vaccine.2018.01.036] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2017] [Revised: 01/02/2018] [Accepted: 01/11/2018] [Indexed: 02/08/2023]
Abstract
Avian pathogenic Escherichia coli (APEC), a leading cause of avian airsacculitis and colibacillosis, is responsible for significant economic loss in the poultry industry. APEC serogroups O1, O2, and O78 are predominantly associated with disease. Lipopolysaccharide (LPS) O-antigen has been shown to be a potent antigen for inducing specific protective immune responses. Therefore, we sought to develop a multivalent polysaccharide vaccine to prevent most APEC infections. We previously reported the stable expression of plasmid pSS27 encoding the APEC O1 O-antigen gene cluster (10.8 kb) in attenuated Salmonella enterica serovar Typhimurium S740 provided excellent protection against APEC O1 challenge. In this study, the plasmid pSS28 harboring the APEC O2 O-antigen polysaccharide gene cluster (15.5 kb) was constructed. Biosynthesis of pSS28-encoded APEC O2 O-antigen in Salmonella vaccine strain S740 was validated by Western blot. The recombinant Salmonella vaccine strain S740 (pSS28) elicited homologous protection against virulent wild-type APEC O2 challenge in a chicken model. Furthermore, through equal-volume mixing the two monovalent vaccine strains S740 (pSS27) and S740 (pSS28), a bivalent vaccine candidate against both APEC O1 and O2 was developed. Immunization of chickens with the bivalent vaccine elicited production of serum IgG and mucosal sIgA antibodies against the LPS of both APEC O1 and O2. Moreover, antibodies induced by the bivalent vaccine promoted opsonization, provoked complement-mediated bactericidal activity, and elicited protection against lethal challenge with both virulent APEC O1 and O2 strains. These results demonstrate that the bivalent vaccine comprised of S740 (pSS27) and S740 (pSS28) is a promising vaccine candidate against APEC O1 and O2 infection.
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Affiliation(s)
- Yue Han
- Institute of Preventive Veterinary Medicine, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu 611130, China; Department of Infectious Diseases and Pathology, University of Florida, Gainesville, FL 32608, USA
| | - Qing Liu
- College of Animal Science and Technology, Southwest University, Chongqing 400715, China
| | - Stephan Willias
- Department of Infectious Diseases and Pathology, University of Florida, Gainesville, FL 32608, USA
| | - Kang Liang
- Institute of Preventive Veterinary Medicine, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu 611130, China
| | - Pei Li
- Institute of Preventive Veterinary Medicine, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu 611130, China
| | - Anchun Cheng
- Institute of Preventive Veterinary Medicine, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu 611130, China.
| | - Qingke Kong
- Institute of Preventive Veterinary Medicine, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu 611130, China; Department of Infectious Diseases and Pathology, University of Florida, Gainesville, FL 32608, USA.
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