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Boone AC, Kulkarni RR, Cortes AL, Gaghan C, Mohammed J, Villalobos T, Esandi J, Gimeno IM. Evaluation of Adjuvant Effect of Cytosine-Guanosine-Oligodeoxynucleotide in Meat-Type Chickens Coadministered In Ovo with Herpesvirus of Turkey Vaccine. Viral Immunol 2024; 37:89-100. [PMID: 38301195 DOI: 10.1089/vim.2023.0125] [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] [Indexed: 02/03/2024] Open
Abstract
Herpesvirus of turkey (HVT) increases activation of T cells in 1-day-old chickens when administered in ovo. This study evaluated whether adding cytosine-guanosine oligodeoxynucleotides (CpG ODNs) to the HVT vaccine could enhance the adjuvant effect of HVT. We used a CpG ODN dose of 10 μg per egg. The experimental groups were (1) diluent-only control (sham), (2) HVT, (3) HVT+CpG ODN, (4) HVT+non-CpG ODN, (5) CpG ODN, and (6) non-CpG ODN control. Cellular response evaluation included measuring the frequencies of macrophages (KUL01+MHC-II+), gamma delta T cells (γδTCR+MHC-II+), CD4+, and CD8+ T cell subsets, including double-positive (DP) cells. In addition, CD4+ and CD8+ T cell activation was evaluated by measuring the cellular expression of major histocompatibility complex class II (MHC-II), CD44 or CD28 costimulatory molecules. An adjuvant effect was considered when HVT+CpG ODN, but not HVT+non CpG ODN, or CpG ODN, or non-CpG ODN, induced significantly increased effects on any of the immune parameters examined when compared with HVT. The findings showed that (1) HVT vaccination induced significantly higher frequencies of γδ+MHC-II+ and CD4+CD28+ T cells when compared with sham chickens. Frequencies of DP and CD4+CD28+ T cells in HVT-administered birds were significantly higher than those observed in the non-CpG ODN group. (2) Groups receiving HVT+CpG ODN or CpG ODN alone were found to have significantly increased frequencies of activated CD4+ and CD8+ T cells, when compared with HVT. Our results show that CpG ODN administration in ovo with or without HVT significantly increased frequencies of activated CD4+ and CD8+ T cells.
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Affiliation(s)
- Allison C Boone
- Department of Population Health and Pathobiology, College of Veterinary Medicine, North Carolina State University, Raleigh, North Carolina, USA
- Experimental Pathology Laboratories, Inc., Durham, North Carolina, USA
| | - Raveendra R Kulkarni
- Department of Population Health and Pathobiology, College of Veterinary Medicine, North Carolina State University, Raleigh, North Carolina, USA
| | - Aneg L Cortes
- Department of Population Health and Pathobiology, College of Veterinary Medicine, North Carolina State University, Raleigh, North Carolina, USA
| | - Carissa Gaghan
- Department of Population Health and Pathobiology, College of Veterinary Medicine, North Carolina State University, Raleigh, North Carolina, USA
| | - Javid Mohammed
- Experimental Pathology Laboratories, Inc., Durham, North Carolina, USA
| | | | - Javier Esandi
- Zoetis-Global Biodevice, Durham, North Carolina, USA
| | - Isabel M Gimeno
- Department of Population Health and Pathobiology, College of Veterinary Medicine, North Carolina State University, Raleigh, North Carolina, USA
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2
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Liu J, Chen L, Li G, Tian Y, Zeng T, Xu W, Xu Q, Lu L, Gu T. Immunopromoter improves liver apoptosis and immune response in Shaoxing ducklings. Anim Biotechnol 2023; 34:4667-4674. [PMID: 36861935 DOI: 10.1080/10495398.2023.2183215] [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] [Indexed: 03/03/2023]
Abstract
Antibiotics as feed additives, play a vital role in animal husbandry. However, overused antibiotics could cause endogenous infections in animals, and even endanger human health through the food chain. And immunopotentiators can make the low immune function improve and accelerate the induction of immune response. The aim of this study was to investigate the effects of five different immunopotentiators on the expression of liver apoptosis and immune factor related genes in Shaoxing ducklings (Anas Platyrhynchos). A total of 150 one-day-old Shaoxing ducklings were randomly divided into six groups including saline, chlorogenic acid, β-D-glucan, astragalus flavone, CpG DNA and chicken IgG, which were injected subcutaneously into the neck, respectively. At 18 days old, the liver tissues were collected to detecte the mRNA and protein expression levels of inflammatory and apoptosis-related genes. The results showed that compared with the control group, the mRNA and protein levels of liver Bcl2 with chlorogenic acid, β-D-glucan, astragalus flavone, CpG-DNA and chicken IgG were significantly decreased (p < 0.05), while the expression level of Caspase3 was up-regulated in some different degrees. In addition,The expression levels of liver iNOS and COX2 were significantly increased after the injection of five immunopotentiators (p < 0.05), and the mRNA levels of IFN-α, IFN-β, IL-1β, RIG-I, TLR3 and TLR7 genes were also significantly up-regulated compared with the control group (p < 0.05). In conclusion, chlorogenic acid, β-D-glucan, astragalus flavone, CpG-DNA and chicken IgG can be used as immunopotentiators to regulate duck innate immunity. This study provides a new way to prevent important infectious diseases of ducks, and also provides a certain reference for the application of antibiotic substitutes in animal production.
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Affiliation(s)
- Jinyu Liu
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Institute of Animal Husbandry and Veterinary Medicine, Zhejiang Academy of Agricultural Sciences, Hangzhou, China
| | - Li Chen
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Institute of Animal Husbandry and Veterinary Medicine, Zhejiang Academy of Agricultural Sciences, Hangzhou, China
| | - Guoqin Li
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Institute of Animal Husbandry and Veterinary Medicine, Zhejiang Academy of Agricultural Sciences, Hangzhou, China
| | - Yong Tian
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Institute of Animal Husbandry and Veterinary Medicine, Zhejiang Academy of Agricultural Sciences, Hangzhou, China
| | - Tao Zeng
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Institute of Animal Husbandry and Veterinary Medicine, Zhejiang Academy of Agricultural Sciences, Hangzhou, China
| | - Wenwu Xu
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Institute of Animal Husbandry and Veterinary Medicine, Zhejiang Academy of Agricultural Sciences, Hangzhou, China
| | - Qi Xu
- Jiangsu Key Laboratory for Animal Genetic, Breeding and Molecular Design, Yangzhou University, Yangzhou, China
| | - Lizhi Lu
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Institute of Animal Husbandry and Veterinary Medicine, Zhejiang Academy of Agricultural Sciences, Hangzhou, China
| | - Tiantian Gu
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Institute of Animal Husbandry and Veterinary Medicine, Zhejiang Academy of Agricultural Sciences, Hangzhou, China
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Gu Y, Hu Y, Huang S, Ruiz S, Kawai T, Bai Y, Han X. CpG ODN/Mangiferin Dual Delivery through Calcium Alginate Hydrogels Inhibits Immune-Mediated Osteoclastogenesis and Promotes Alveolar Bone Regeneration in Mice. BIOLOGY 2023; 12:976. [PMID: 37508406 PMCID: PMC10376397 DOI: 10.3390/biology12070976] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Revised: 06/08/2023] [Accepted: 07/04/2023] [Indexed: 07/30/2023]
Abstract
The immune system plays an important role in the skeletal system during bone repair and regeneration. The controlled release of biological factors from the immune system could facilitate and optimize the bone remodeling process through the regulation of the activities of bone cells. This study aimed to determine the effect of the controlled delivery of immunomodulatory biologicals on bone regeneration. Immunostimulatory cytosine-phosphate-guanosine oligodeoxynucleotides (CpG ODN) and glucosylxanthone Mangiferin (MAG)-embedded microbeads were incubated with P. gingivalis-challenged splenocytes, or co-cultured with RAW264.7 cells. The effect of CpG ODN/MAG-containing microbeads on bone regeneration was then tested in vivo in a mouse alveolar bone defect model. The results demonstrated that MAG significantly antagonized P. gingivalis proliferation and reduced the live/dead cell ratio. After the addition of CpG ODN + MAG microbeads, anti-inflammatory cytokines IL-10 and IL-4 were upregulated on day 2 but not day 4, whereas pro-inflammatory cytokine IL-1β responses showed no difference at both timepoints. RANKL production by splenocytes and TRAP+ cell formation of RAW264.7 cells were inhibited by the addition of CpG ODN + MAG microbeads. Alveolar bony defects, filled with CpG ODN + MAG microbeads, showed significantly increased new bone after 4 weeks. In summary, this study evaluated a new hydrogel-based regimen for the local delivery and controlled release of biologicals to repair and regenerate alveolar bony defects. The combined CpG ODN + MAG treatment may promote alveolar bone regeneration through the anti-microbial/anti-inflammatory effects and the inhibition of RANKL-mediated osteoclastogenesis.
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Affiliation(s)
- Yingzhi Gu
- Department of Immunology and Infectious Diseases, The Forsyth Institute, 245 First Street, Cambridge, MA 02142, USA
- Department of Orthodontics, Beijing Stomatological Hospital, Capital Medical University, Beijing 100050, China
| | - Yang Hu
- Department of Immunology and Infectious Diseases, The Forsyth Institute, 245 First Street, Cambridge, MA 02142, USA
| | - Shengyuan Huang
- Department of Oral Science and Translational Research, College of Dental Medicine, Nova Southeastern University, Fort Lauderdale, FL 33314, USA
- Department of Stomatology, Beijing Tongren Hospital, Capital Medical University, Beijing 100730, China
| | - Sunniva Ruiz
- Department of Oral Science and Translational Research, College of Dental Medicine, Nova Southeastern University, Fort Lauderdale, FL 33314, USA
| | - Toshihisa Kawai
- Department of Oral Science and Translational Research, College of Dental Medicine, Nova Southeastern University, Fort Lauderdale, FL 33314, USA
| | - Yuxing Bai
- Department of Orthodontics, Beijing Stomatological Hospital, Capital Medical University, Beijing 100050, China
| | - Xiaozhe Han
- Department of Immunology and Infectious Diseases, The Forsyth Institute, 245 First Street, Cambridge, MA 02142, USA
- Department of Oral Science and Translational Research, College of Dental Medicine, Nova Southeastern University, Fort Lauderdale, FL 33314, USA
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Host Responses Following Infection with Canadian-Origin Wildtype and Vaccine Revertant Infectious Laryngotracheitis Virus. Vaccines (Basel) 2022; 10:vaccines10050782. [PMID: 35632538 PMCID: PMC9148004 DOI: 10.3390/vaccines10050782] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Revised: 05/02/2022] [Accepted: 05/13/2022] [Indexed: 02/01/2023] Open
Abstract
Infectious laryngotracheitis (ILT) is caused by Gallid herpesvirus-1 (GaHV-1) or infectious laryngotracheitis virus (ILTV) and was first described in Canadian poultry flocks. In Canada, ILTV infection is endemic in backyard flocks, and commercial poultry encounters ILT outbreaks sporadically. A common practice to control ILT is the use of live attenuated vaccines. However, outbreaks still occur in poultry flocks globally due to ILTV vaccine strains reverting to virulence and emergence of new ILTV strains due to recombination in addition to circulating wildtype strains. Recent studies reported that most of the ILT outbreaks in Canada were induced by the chicken-embryo-origin (CEO) live attenuated vaccine revertant strains with the involvement of a small percentage of wildtype ILTV. It is not known if the host responses induced by these two ILTV strains are different. The objective of the study was to compare the host responses elicited by CEO revertant and wildtype ILTV strains in chickens. We infected 3-week-old specific pathogen-free chickens with the two types of ILTV isolates and subsequently evaluated the severity of clinical and pathological manifestations, in addition to host responses. We observed that both of the isolates show high pathogenicity by inducing several clinical and pathological manifestations. A significant recruitment of immune cells at both 3 and 7 days post-infection (dpi) was observed in the tracheal mucosa and the lung tissues of the infected chickens with wildtype and CEO vaccine revertant ILTV isolates when compared to uninfected controls. Overall, this study provides a better understanding of the mechanism of host responses against ILTV infection.
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Xue L, Wang D, Zhang D, Ju A, Duan A, Xing J, Qin Y, Yang S, Luan W. The immune adjuvant effect of Astragalus polysaccharide on in ovo injection of Newcastle disease vaccine. J Anim Physiol Anim Nutr (Berl) 2020; 104:1719-1726. [PMID: 32557888 DOI: 10.1111/jpn.13388] [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: 01/31/2020] [Revised: 04/04/2020] [Accepted: 04/06/2020] [Indexed: 12/22/2022]
Abstract
In this study, immunogenic efficacies of in ovo administration of Astragalus polysaccharide (APS) along with live Newcastle disease vaccine (live ND vaccine) (live VG/GA strain) were evaluated. Four hundred fertilized eggs were randomly divided into four groups (n = 100/group), and vaccinated in ovo, respectively, with solutions of APS, live ND vaccine, live ND vaccine combined with APS, and 0.9% physiological saline into their amniotic fluid on d 18.5 of incubation. Significant improvement of chicks' development was displayed in those vaccinated with live ND vaccine adjuvanted with APS in ovo, manifested as enhanced hatchability and gaining weight. Moreover, in ovo administration of live NDV vaccine plus APS could significantly enhance the serum anti-NDV antibody titres and interferon gamma (IFN-γ), interleukin (IL)-2, IL-4 and IL-6 concentrations, promote lymphocyte proliferative capability as well as improve the frequencies of CD4+ and CD8+ T cells in peripheral blood. Overall results indicated in ovo administration of live ND vaccine adjuvanted with APS could stimulate stronger humoral and cellular responses in newly hatched chicks.
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Affiliation(s)
- Ligang Xue
- College of Animal Science and Technology, Jilin Agricultural University, Changchun, China.,College of Life Science, Changchun Sci-Tech University, Changchun, China
| | - Dan Wang
- College of Animal Science and Technology, Jilin Agricultural University, Changchun, China
| | - Dongxing Zhang
- College of Animal Science and Technology, Jilin Agricultural University, Changchun, China
| | - Anqi Ju
- College of Animal Science and Technology, Jilin Agricultural University, Changchun, China
| | - Aoyi Duan
- College of Animal Science and Technology, Jilin Agricultural University, Changchun, China
| | - Junhong Xing
- College of Animal Science and Technology, Jilin Agricultural University, Changchun, China
| | - Yanjun Qin
- College of Animal Science and Technology, Jilin Agricultural University, Changchun, China
| | - Shubao Yang
- College of Animal Science and Technology, Jilin Agricultural University, Changchun, China
| | - Weimin Luan
- College of Animal Science and Technology, Jilin Agricultural University, Changchun, China
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6
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Byrne KA, Loving CL, McGill JL. Innate Immunomodulation in Food Animals: Evidence for Trained Immunity? Front Immunol 2020; 11:1099. [PMID: 32582185 PMCID: PMC7291600 DOI: 10.3389/fimmu.2020.01099] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2020] [Accepted: 05/06/2020] [Indexed: 01/07/2023] Open
Abstract
Antimicrobial resistance (AMR) is a significant problem in health care, animal health, and food safety. To limit AMR, there is a need for alternatives to antibiotics to enhance disease resistance and support judicious antibiotic usage in animals and humans. Immunomodulation is a promising strategy to enhance disease resistance without antibiotics in food animals. One rapidly evolving field of immunomodulation is innate memory in which innate immune cells undergo epigenetic changes of chromatin remodeling and metabolic reprogramming upon a priming event that results in either enhanced or suppressed responsiveness to secondary stimuli (training or tolerance, respectively). Exposure to live agents such as bacille Calmette-Guerin (BCG) or microbe-derived products such as LPS or yeast cell wall ß-glucans can reprogram or "train" the innate immune system. Over the last decade, significant advancements increased our understanding of innate training in humans and rodent models, and strategies are being developed to specifically target or regulate innate memory. In veterinary species, the concept of enhancing the innate immune system is not new; however, there are few available studies which have purposefully investigated innate training as it has been defined in human literature. The development of targeted approaches to engage innate training in food animals, with the practical goal of enhancing the capacity to limit disease without the use of antibiotics, is an area which deserves attention. In this review, we provide an overview of innate immunomodulation and memory, and the mechanisms which regulate this long-term functional reprogramming in other animals (e.g., humans, rodents). We focus on studies describing innate training, or similar phenomenon (often referred to as heterologous or non-specific protection), in cattle, sheep, goats, swine, poultry, and fish species; and discuss the potential benefits and shortcomings of engaging innate training for enhancing disease resistance.
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Affiliation(s)
- Kristen A. Byrne
- Food Safety and Enteric Pathogens Research Unit, National Animal Disease Center, Agricultural Research Services, USDA, Ames, IA, United States
| | - Crystal L. Loving
- Food Safety and Enteric Pathogens Research Unit, National Animal Disease Center, Agricultural Research Services, USDA, Ames, IA, United States
| | - Jodi L. McGill
- Department of Veterinary Microbiology and Preventive Medicine, Iowa State University, Ames, IA, United States
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7
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CpG-ODN Induces a Dose-Dependent Enrichment of Immunological Niches in the Spleen and Lungs of Neonatal Chicks That Correlates with the Protective Immunity against Escherichia coli. J Immunol Res 2020; 2020:2704728. [PMID: 32411791 PMCID: PMC7201825 DOI: 10.1155/2020/2704728] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2019] [Accepted: 12/05/2019] [Indexed: 01/25/2023] Open
Abstract
Immunoprotective function of oligodeoxynucleotides containing CpG motifs (CpG-ODN) has been demonstrated in neonatal chickens against common bacterial pathogens such as E.coli and Salmonella sp. Our recent study reported that CpG-ODN administration enriches immune compartments in neonatal chicks. However, a causal relationship between CpG-ODN-induced immune enrichment and protective mechanisms remains unestablished. In this study, we investigated in ovo administered CpG-ODN-mediated immune cell recruitment in the immunological niches in lymphoid (spleen) and nonlymphoid (lungs) organs using various doses of CpG-ODN and examined whether the immunological profiles have any correlation with immunoprotection against E.coli infection. Eighteen-day-old embryonated eggs were injected with either 5, 10, 25, and 50 μg of CpG-ODN or saline (n = ~40 per group). On the day of hatch (72 hr after CpG-ODN treatment), we collected the spleen and lungs (n = 3‐4 per group) and examined the recruitment of macrophages/monocytes, their expression of MHCII and CD40, and the number of CD4+ and CD8+ T-cell subsets in the immunological niches in the spleen and lungs using flow cytometry. We observed the dose-dependent recruitment of immune cells, wherein 25 μg and 50 μg of CpG-ODN induced significant enrichment of immunological niches in both the spleen and the lungs. Four days after the CpG-ODN treatment (1-day after hatch), chicks were challenged with a virulent strain of E. coli (1 × 104 or 1 × 105 cfu, subcutaneously). Clinical outcome and mortality were monitored for 8 days postchallenge. We found that both 25 μg and 50 μg of CpG-ODN provided significant protection and reduced clinical scores compared to saline controls against E. coli infection. Overall, the present study revealed that CpG-ODNs orchestrate immunological niches in neonatal chickens in a dose-dependent manner that resulted in differential protection against E. coli infection, thus supporting a cause and effect relationship between CpG-ODN-induced immune enrichment and the antibacterial immunity.
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Alkie TN, Yitbarek A, Hodgins DC, Kulkarni RR, Taha-Abdelaziz K, Sharif S. Development of innate immunity in chicken embryos and newly hatched chicks: a disease control perspective. Avian Pathol 2019; 48:288-310. [PMID: 31063007 DOI: 10.1080/03079457.2019.1607966] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Newly hatched chickens are confronted by a wide array of pathogenic microbes because their adaptive immune defences have limited capabilities to control these pathogens. In such circumstances, and within this age group, innate responses provide a degree of protection. Moreover, as the adaptive immune system is relatively naïve to foreign antigens, synergy with innate defences is critical. This review presents knowledge on the ontogeny of innate immunity in chickens pre-hatch and early post-hatch and provides insights into possible interventions to modulate innate responses early in the life of the bird. As in other vertebrate species, the chicken innate immune system which include cellular mediators, cytokine and chemokine repertoires and molecules involved in antigen detection, develop early in life. Comparison of innate immune systems in newly hatched chickens and mature birds has revealed differences in magnitude and quality, but responses in younger chickens can be boosted using innate immune system modulators. Functional expression of pattern recognition receptors and several defence molecules by innate immune system cells of embryos and newly hatched chicks suggests that innate responses can be modulated at this stage of development to combat pathogens. Improved understanding of innate immune system ontogeny and functionality in chickens is critical for the implementation of sound and safe interventions to provide long-term protection against pathogens. Next-generation tools for studying genetic and epigenetic regulation of genes, functional metagenomics and gene knockouts can be used in the future to explore and dissect the contributions of signalling pathways of innate immunity and to devise more efficacious disease control strategies.
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Affiliation(s)
- Tamiru N Alkie
- a Department of Pathobiology, Ontario Veterinary College , University of Guelph , Guelph , ON , Canada
| | - Alexander Yitbarek
- a Department of Pathobiology, Ontario Veterinary College , University of Guelph , Guelph , ON , Canada
| | - Douglas C Hodgins
- a Department of Pathobiology, Ontario Veterinary College , University of Guelph , Guelph , ON , Canada
| | - Raveendra R Kulkarni
- a Department of Pathobiology, Ontario Veterinary College , University of Guelph , Guelph , ON , Canada
| | - Khaled Taha-Abdelaziz
- a Department of Pathobiology, Ontario Veterinary College , University of Guelph , Guelph , ON , Canada.,b Pathology Department, Faculty of Veterinary Medicine , Beni-Suef University , Beni-Suef , Egypt
| | - Shayan Sharif
- a Department of Pathobiology, Ontario Veterinary College , University of Guelph , Guelph , ON , Canada
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The immunostimulator Victrio activates chicken toll-like receptor 21. Vet Immunol Immunopathol 2019; 220:109977. [PMID: 31760146 DOI: 10.1016/j.vetimm.2019.109977] [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: 07/11/2019] [Revised: 10/31/2019] [Accepted: 11/13/2019] [Indexed: 01/08/2023]
Abstract
The immunostimulator Victrio consists of bacterial plasmid DNA encased in cationic liposomes and protects embryonated chicken eggs and newly hatched chickens against Escherichia coli induced mortality. It is demonstrated that Victrio specifically and potently activates recombinant chicken toll-like receptor 21 (TLR21) in a nuclear factor kappa B reporter gene assay. This TLR21 stimulatory activity is dependent on the presence of nonmethylated CpG and requires liposomal formulation of the DNA, as naked plasmid DNA proves to be inactive. Nitric oxide production is induced by Victrio in HD11 chicken macrophages that express TLR21 naturally, supporting the proposal that chicken TLR21 is a component of the molecular mode of action of Victrio.
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10
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Nawab A, An L, Wu J, Li G, Liu W, Zhao Y, Wu Q, Xiao M. Chicken toll-like receptors and their significance in immune response and disease resistance. Int Rev Immunol 2019; 38:284-306. [PMID: 31662000 DOI: 10.1080/08830185.2019.1659258] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Infectious diseases are a major challenge for the poultry industry that causes widespread production losses. Thus, management and control of poultry health and diseases are essential for the viability of the industry. Toll-like receptors are best characterized as membrane-bound receptors that perform a central role in immune homeostasis and disease resistance by recognition of pathogen-associated molecular patterns. In response to pathogen recognition, TLRs initiate both innate and adaptive immune responses which may help to develop immunomodulatory therapeutics for TLR associated diseases. Vaccination produces specific immunity in the animal's body towards pathogens. However, due to certain disadvantages of vaccines, (inactivation of attenuated pathogens into the virulent strains and weak immunogenicity of inactivated vaccines) there is a crucial need to develop the safe and effective therapeutic intervention. TLR ligands have been classified as a potential adjuvant against the infectious diseases in farm animals. TLR adjuvants induce both specific and nonspecific immune responses in chickens to combat several bacterial, viral and parasitic diseases. Therefore, the aim of this review was to explore the chicken TLR4 and their role in immune responses and disease resistance to develop disease resistance poultry breeds in future.
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Affiliation(s)
- Aamir Nawab
- Department of Animal Science, Guangdong Ocean University, Zhanjiang, Guangdong, China.,Faculty of Veterinary Medicine, PMAS- Arid Agriculture University Rawalpindi, Rawalpindi, Pakistan
| | - Lilong An
- Department of Animal Science, Guangdong Ocean University, Zhanjiang, Guangdong, China
| | - Jiang Wu
- Department of Animal Science, Guangdong Ocean University, Zhanjiang, Guangdong, China
| | - Guanghui Li
- Department of Animal Science, Guangdong Ocean University, Zhanjiang, Guangdong, China
| | - Wenchao Liu
- Department of Animal Science, Guangdong Ocean University, Zhanjiang, Guangdong, China
| | - Yi Zhao
- Department of Animal Science, Guangdong Ocean University, Zhanjiang, Guangdong, China
| | - Qimin Wu
- Mechanical and Power Engineering College, Guangdong Ocean University, Zhanjiang, Guangdong, China
| | - Mei Xiao
- Department of Animal Science, Guangdong Ocean University, Zhanjiang, Guangdong, China
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11
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Role of cytosine-phosphate-guanosine-Oligodeoxynucleotides (CpG ODNs) as adjuvant in poultry vaccines. WORLD POULTRY SCI J 2019. [DOI: 10.1017/s0043933918000508] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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12
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Goonewardene KB, Popowich S, Gunawardana T, Gupta A, Kurukulasuriya S, Karunarathna R, Chow-Lockerbie B, Ahmed KA, Tikoo SK, Foldvari M, Willson P, Gomis S. Intrapulmonary Delivery of CpG-ODN Microdroplets Provides Protection Against Escherichia coli Septicemia in Neonatal Broiler Chickens. Avian Dis 2019; 61:503-511. [PMID: 29337617 DOI: 10.1637/11684-060617-reg.1] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Synthetic oligodeoxynucleotides (ODN) containing unmethylated cytosine phosphodiester guanine (CpG) motifs (CpG-ODN) are effective immunostimulatory agents against a variety of viral, bacterial, and protozoan diseases in different animals including poultry. We have recently demonstrated that in ovo injection of CpG-ODN confers protection in neonatal chickens against bacterial septicemias. The objective of this study was to investigate the effectiveness of needle-free intrapulmonary (IPL) delivery of CpG-ODN microdroplets against Escherichia coli infection in neonatal chicks. In the present study, we used 880 chicks in total keeping 40 chicks per group. Chicks were delivered CpG-ODN or saline by IPL at the day 1 of hatch. Three days later, chicks were challenged with two doses (1 × 104 CFU, n = 20 or 1 × 105 CFU, n = 20) of E. coli. Chicks treated with CpG-ODN by the IPL route had significantly lower clinical signs and bacterial load compared to the group treated with saline ( P < 0.05). CpG-ODN-treated groups were significantly protected against E. coli septicemia. We observed dose- and exposure time-dependent immunoprotective effects of IPL CpG-ODN in chicks. We found that IPL delivery of CpG-ODN can induce protective immunity as early as 6 hr that remains effective at least until day 5 post-treatment. Moreover, there were no adverse effects of IPL delivery of CpG-ODN on growth or mortality up to 42 days of age. Based on these findings, it can be suggested that CpG-ODN delivery by IPL route can be a promising alternative to antibiotics for inducing protective immunity in chicks during the critical first week of neonatal life.
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Affiliation(s)
- Kalhari Bandara Goonewardene
- A Department of Veterinary Pathology, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, SK, S7N 5B4, Canada
| | - Shelly Popowich
- A Department of Veterinary Pathology, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, SK, S7N 5B4, Canada
| | - Thushari Gunawardana
- A Department of Veterinary Pathology, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, SK, S7N 5B4, Canada
| | - Ashish Gupta
- A Department of Veterinary Pathology, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, SK, S7N 5B4, Canada
| | - Shanika Kurukulasuriya
- A Department of Veterinary Pathology, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, SK, S7N 5B4, Canada
| | - Ruwani Karunarathna
- A Department of Veterinary Pathology, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, SK, S7N 5B4, Canada
| | - Betty Chow-Lockerbie
- A Department of Veterinary Pathology, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, SK, S7N 5B4, Canada
| | - Khawaja Ashfaque Ahmed
- A Department of Veterinary Pathology, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, SK, S7N 5B4, Canada
| | - Suresh K Tikoo
- B Vaccine and Infectious Disease Organization, 120 Veterinary Road, University of Saskatchewan, Saskatoon, SK, S7N 5E3, Canada.,C Vaccinology and Immunotherapy, School of Public Health, University of Saskatchewan, Saskatoon, SK, 7N 5E3, Canada
| | - Marianna Foldvari
- D School of Pharmacy, University of Waterloo, 200 University Avenue West, Waterloo, ON, N2L 3G1, Canada
| | - Philip Willson
- E Canadian Centre for Health and Safety in Agriculture, University of Saskatchewan, Saskatoon, Canada, SK S7N 5E5 Canada
| | - Susantha Gomis
- A Department of Veterinary Pathology, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, SK, S7N 5B4, Canada
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13
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Abdul-Cader MS, De Silva Senapathi U, Ahmed-Hassan H, Sharif S, Abdul-Careem MF. Single stranded (ss)RNA-mediated antiviral response against infectious laryngotracheitis virus infection. BMC Microbiol 2019; 19:34. [PMID: 30736730 PMCID: PMC6368756 DOI: 10.1186/s12866-019-1398-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2018] [Accepted: 01/23/2019] [Indexed: 12/31/2022] Open
Abstract
Background Single stranded ribonucleic acid (ssRNA) binds to toll-like receptor (TLR)7 leading to recruitment of immune cells and production of pro-inflammatory cytokines, which has been shown in mammals. In chickens, synthetic ssRNA analog, resiquimod, has been shown to elicit antiviral response against infectious bursal disease virus infection. The objective of this study was to determine the innate host responses activated by the pre-hatch in ovo administration of resiquimod against infectious laryngotracheitis virus (ILTV) infection in chickens post-hatch. Results First, we observed that in ovo treatment of resiquimod at embryo day (ED) 18 increases macrophage recruitment in respiratory and gastrointestinal tissues of chicken day 1 post-hatch in addition to interleukin (IL)-1β in lungs. Second, we observed that in ovo treatment of resiquimod reduces ILTV cloacal shedding at 7 days post-infection (dpi) when challenged at day 1 post-hatch coinciding with higher macrophage recruitment. In vitro, we found that resiquimod enhances production of nitric oxide (NO) and IL-1β and not type 1 interferon (IFN) activity in avian macrophages. Although, the antiviral response against ILTV is associated with the enhanced innate immune response, it is not dependent on any of the innate immune mediators observed as has been shown in vitro using avian macrophage. Conclusion This study provides insights into the mechanisms of antiviral response mediated by resiquimod, particularly against ILTV infection in chicken.
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Affiliation(s)
- Mohamed Sarjoon Abdul-Cader
- Faculty of Veterinary Medicine, Health Research Innovation Center 2C53, University of Calgary, 3330 Hospital Drive NW, Calgary, AB, T2N 4N1, Canada
| | - Upasama De Silva Senapathi
- Faculty of Veterinary Medicine, Health Research Innovation Center 2C53, University of Calgary, 3330 Hospital Drive NW, Calgary, AB, T2N 4N1, Canada
| | - Hanaa Ahmed-Hassan
- Faculty of Veterinary Medicine, Health Research Innovation Center 2C53, University of Calgary, 3330 Hospital Drive NW, Calgary, AB, T2N 4N1, Canada
| | - Shayan Sharif
- Department of Pathobiology, University of Guelph, Guelph, ON, N1G 2W1, Canada
| | - Mohamed Faizal Abdul-Careem
- Faculty of Veterinary Medicine, Health Research Innovation Center 2C53, University of Calgary, 3330 Hospital Drive NW, Calgary, AB, T2N 4N1, Canada.
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Abdul-Cader MS, De Silva Senapathi U, Nagy E, Sharif S, Abdul-Careem MF. Antiviral response elicited against avian influenza virus infection following activation of toll-like receptor (TLR)7 signaling pathway is attributable to interleukin (IL)-1β production. BMC Res Notes 2018; 11:859. [PMID: 30514372 PMCID: PMC6280464 DOI: 10.1186/s13104-018-3975-4] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Accepted: 11/30/2018] [Indexed: 01/09/2023] Open
Abstract
Objective Single stranded ribonucleic acid (ssRNA) binds to toll-like receptor (TLR)7 leading to recruitment of immune cells and production of pro-inflammatory cytokines, which has been shown in mammals. In chickens, ssRNA has been shown to elicit antiviral response against infectious bursal disease virus infection. The objectives of this study were to determine the pro-inflammatory mediators that are activated downstream of TLR7 signaling pathway in avian macrophages and their roles in antiviral response against avian influenza virus (AIV) infection. Results In this study, first, we stimulated avian macrophages with the analog of ssRNA, resiquimod, and found that the ssRNA was capable of increasing nitric oxide (NO) and interleukin (IL-1β) production in avian macrophages. Second, we observed when the avian macrophages were stimulated with ssRNA, it elicits an antiviral response against AIV. Finally, we demonstrated that when we blocked the IL-1β response using IL-1 receptor antagonist (IL-1Ra) and the NO production using a selective inhibitor of inducible nitric oxide synthase (iNOS), N-([3-(aminomethyl)phenyl]methyl)ethanimidamide dihydrochloride (1400 W), the antiviral response against AIV is attributable to IL-1β production and not to the NO production. This study provides insights into the mechanisms of antiviral response mediated by ssRNA, particularly against AIV infection.
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Affiliation(s)
- Mohamed Sarjoon Abdul-Cader
- Faculty of Veterinary Medicine, University of Calgary, Health Research Innovation Center 2C53, 3330 Hospital Drive NW, Calgary, AB, T2N 4N1, Canada
| | - Upasama De Silva Senapathi
- Faculty of Veterinary Medicine, University of Calgary, Health Research Innovation Center 2C53, 3330 Hospital Drive NW, Calgary, AB, T2N 4N1, Canada
| | - Eva Nagy
- Department of Pathobiology, University of Guelph, Guelph, ON, N1G 2W1, Canada
| | - Shayan Sharif
- Department of Pathobiology, University of Guelph, Guelph, ON, N1G 2W1, Canada
| | - Mohamed Faizal Abdul-Careem
- Faculty of Veterinary Medicine, University of Calgary, Health Research Innovation Center 2C53, 3330 Hospital Drive NW, Calgary, AB, T2N 4N1, Canada.
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15
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De Silva Senapathi U, Abdul-Cader MS, Amarasinghe A, van Marle G, Czub M, Gomis S, Abdul-Careem MF. The In Ovo Delivery of CpG Oligonucleotides Protects against Infectious Bronchitis with the Recruitment of Immune Cells into the Respiratory Tract of Chickens. Viruses 2018; 10:E635. [PMID: 30445707 PMCID: PMC6266937 DOI: 10.3390/v10110635] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2018] [Revised: 11/11/2018] [Accepted: 11/13/2018] [Indexed: 01/11/2023] Open
Abstract
The in ovo delivery of cytosine-guanosine (CpG) oligodeoxynucleotides (ODNs) protects chickens against many bacterial and viral infections, by activating the toll-like receptor (TLR)21 signaling pathway. Although the delivery of CpG ODNs in ovo at embryo day (ED) 18 has been shown to reduce infectious bronchitis virus (IBV) loads in embryonic chicken lungs pre-hatch, whether in ovo delivered CpG ODNs are capable of protecting chickens against a post-hatch challenge is unknown. Thus, our objectives were to determine the protective effect of the in ovo delivery of CpG ODNs at ED 18 against IBV infection encountered post-hatch and, then, to investigate the mechanisms of protection. We found significantly higher survival rates and reduced IBV infection in the chickens following the pre-treatment of the ED 18 eggs with CpG ODNs. At 3 days post infection (dpi), we found an increased recruitment of macrophages, cluster of differentiation (CD)8α+ and CD4+ T lymphocytes, and an up-regulation of interferon (IFN)-γ mRNA in the respiratory tract of the chickens. Overall, it may be inferred that CpG ODNs, when delivered in ovo, provide protection against IBV infection induced morbidity and mortality with an enhanced immune response.
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Affiliation(s)
- Upasama De Silva Senapathi
- Faculty of Veterinary Medicine, University of Calgary, Health Research Innovation Center, 3330 Hospital Drive NW, Calgary, AB T2N 4N1, Canada.
| | - Mohamed Sarjoon Abdul-Cader
- Faculty of Veterinary Medicine, University of Calgary, Health Research Innovation Center, 3330 Hospital Drive NW, Calgary, AB T2N 4N1, Canada.
| | - Aruna Amarasinghe
- Faculty of Veterinary Medicine, University of Calgary, Health Research Innovation Center, 3330 Hospital Drive NW, Calgary, AB T2N 4N1, Canada.
| | - Guido van Marle
- Faculty of Veterinary Medicine, University of Calgary, Health Research Innovation Center, 3330 Hospital Drive NW, Calgary, AB T2N 4N1, Canada.
| | - Markus Czub
- Faculty of Veterinary Medicine, University of Calgary, Health Research Innovation Center, 3330 Hospital Drive NW, Calgary, AB T2N 4N1, Canada.
| | - Susantha Gomis
- Department of Veterinary Pathology, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, SK S7N 5B5, Canada.
| | - Mohamed Faizal Abdul-Careem
- Faculty of Veterinary Medicine, University of Calgary, Health Research Innovation Center, 3330 Hospital Drive NW, Calgary, AB T2N 4N1, Canada.
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Vagnozzi AE, Beltrán G, Zavala G, Read L, Sharif S, García M. Cytokine gene transcription in the trachea, Harderian gland, and trigeminal ganglia of chickens inoculated with virulent infectious laryngotracheitis virus (ILTV) strain. Avian Pathol 2018; 47:497-508. [PMID: 29963906 DOI: 10.1080/03079457.2018.1492090] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
The objective of this study was to determine how cytokine transcription profiles correlate with patterns of infectious laryngotracheitis virus (ILTV) replication in the trachea, Harderian gland, and trigeminal ganglia during the early and late stages of infection after intratracheal inoculation. Viral genomes and transcripts were detected in the trachea and Harderian gland but not in trigeminal ganglia. The onset of viral replication in the trachea was detected at day one post-infection and peaked by day three post-infection. The peak of pro-inflammatory (CXCLi2, IL-1β, IFN-γ) and anti-inflammatory (IL-13, IL-10) cytokine gene transcription, 5 days post-infection, coincided with the increased recruitment of inflammatory cells, extensive tissue damage, and limiting of virus replication in the trachea. In contrast, transcription of the IFN-β gene in the trachea remained unaffected suggesting that ILTV infection blocks type I interferon responses. In the Harderian gland, the most evident transcription change was the early and transient upregulation of the IFN-γ gene at 1 day post-infection, which suggests that the Harderian gland is prepared to rapidly respond to ILTV infection. Overall, results from this study suggest that regulation of Th1 effector cells and macrophage activity by Th1/2 cytokines was pertinent to maintain a balanced immune response capable of providing an adequate Th1-mediated protective immunity, while sustaining some immune homeostasis in preparation for the regeneration of the tracheal mucosa.
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Affiliation(s)
| | - Gabriela Beltrán
- b Poultry Diagnostic and Research Center, Department of Population Health , College of Veterinary Medicine University of Georgia , Athens , GA , USA
| | | | - Leah Read
- d Department of Pathobiology, Ontario Veterinary College , University of Guelph , Guelph , ON , Canada
| | - Shayan Sharif
- d Department of Pathobiology, Ontario Veterinary College , University of Guelph , Guelph , ON , Canada
| | - Maricarmen García
- b Poultry Diagnostic and Research Center, Department of Population Health , College of Veterinary Medicine University of Georgia , Athens , GA , USA
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17
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Astill J, Alkie T, Yitbarek A, Taha-Abdelaziz K, Bavananthasivam J, Nagy É, Petrik JJ, Sharif S. Induction of immune response in chickens primed in ovo with an inactivated H9N2 avian influenza virus vaccine. BMC Res Notes 2018; 11:428. [PMID: 29970157 PMCID: PMC6029274 DOI: 10.1186/s13104-018-3537-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2018] [Accepted: 06/26/2018] [Indexed: 11/25/2022] Open
Abstract
Objective Infection of chickens with low pathogenic avian influenza virus, such as H9N2 virus, culminates in decreased egg production and increased mortality and morbidity if co-infection with other respiratory pathogens occurs. We have previously observed the induction of antibody- and cell-mediated immune responses after intramuscular administration of an H9N2 beta-propiolactone inactivated virus vaccine to chickens. Given the fact that in ovo vaccination represents a practical option for vaccination against H9N2 AIV in chickens, in the current study, we set out to characterize immune responses in chickens against a beta-propiolactone inactivated H9N2 virus vaccine after primary vaccination in ovo on embryonic day 18, and secondary intramuscular vaccination on day 14 post-hatch. We also included the Toll-like receptor 21 ligand, CpG ODN 2007, and an oil emulsion adjuvant, AddaVax™, as adjuvants for the vaccines. Results Antibody-mediated immune responses were observed after administering the secondary intramuscular vaccine. Cell-mediated immune responses were observed in chickens that received the beta-propiolactone inactivated H9N2 virus combined with AddaVax™. Our results demonstrate that adaptive immune responses can be induced in chickens after a primary in ovo vaccination and secondary intramuscular vaccination.
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Affiliation(s)
- Jake Astill
- Department of Pathobiology, Ontario Veterinary College, University of Guelph, Guelph, ON, N1G 2W1, Canada
| | - Tamiru Alkie
- Department of Pathobiology, Ontario Veterinary College, University of Guelph, Guelph, ON, N1G 2W1, Canada.,Department of Biology, Wilfred Laurier University, Waterloo, ON, N2L 3C5, Canada
| | - Alexander Yitbarek
- Department of Pathobiology, Ontario Veterinary College, University of Guelph, Guelph, ON, N1G 2W1, Canada
| | - Khaled Taha-Abdelaziz
- Department of Pathobiology, Ontario Veterinary College, University of Guelph, Guelph, ON, N1G 2W1, Canada.,Pathology Department, Faculty of Veterinary Medicine, Beni-Suef University, Al Shamlah, Beni-Suef, 62511, Egypt
| | - Jegarubee Bavananthasivam
- Department of Pathobiology, Ontario Veterinary College, University of Guelph, Guelph, ON, N1G 2W1, Canada
| | - Éva Nagy
- Department of Pathobiology, Ontario Veterinary College, University of Guelph, Guelph, ON, N1G 2W1, Canada
| | - James John Petrik
- Department of Biomedical Sciences, Ontario Veterinary College, University of Guelph, Guelph, ON, N1G 2W1, Canada
| | - Shayan Sharif
- Department of Pathobiology, Ontario Veterinary College, University of Guelph, Guelph, ON, N1G 2W1, Canada.
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Effects of early feeding and dietary interventions on development of lymphoid organs and immune competence in neonatal chickens: A review. Vet Immunol Immunopathol 2018; 201:1-11. [DOI: 10.1016/j.vetimm.2018.05.001] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2017] [Revised: 05/04/2018] [Accepted: 05/06/2018] [Indexed: 12/14/2022]
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19
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Bavananthasivam J, Alkie TN, Astill J, Abdul-Careem MF, Wootton SK, Behboudi S, Yitbarek A, Sharif S. In ovo administration of Toll-like receptor ligands encapsulated in PLGA nanoparticles impede tumor development in chickens infected with Marek's disease virus. Vaccine 2018; 36:4070-4076. [PMID: 29859800 DOI: 10.1016/j.vaccine.2018.05.091] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2018] [Revised: 04/20/2018] [Accepted: 05/21/2018] [Indexed: 01/17/2023]
Abstract
One of the economically important diseases in the poultry industry is Marek's disease (MD) which is caused by Marek's disease virus (MDV). The use of current vaccines provides protection against clinical signs of MD in chickens. However, these vaccines do not prevent the transmission of MDV to susceptible hosts, hence they may promote the development of new virulent strains of MDV. This issue persuaded us to explore alternative approaches to control MD in chickens. Induction of innate responses at the early stage of life in the chicken may help to prevent or reduce MDV infection. Further, prophylactic use of Toll-like receptor ligands (TLR-Ls) has been shown to generate host immunity against infectious diseases. In this regard, encapsulation of TLR-Ls in Poly(d, l-lactic-co-glycolic acid) (PLGA) may further enhance host responses by controlled release of TLR-Ls for an extended period. Hence, in the current study, protective effects of encapsulated TLR4 and TLR21 ligands, LPS and CpG, respectively, were investigated against MD. Results indicated that administration of encapsulated CpG and LPS first at embryonic day (ED) 18, followed by post-hatch at 14 days-post infection (dpi) intramuscularly, diminished tumor incidence by 60% and 42.8%, respectively at 21dpi compared to the MDV only group. In addition, analysis of cytokine gene profiles of interferon (IFN)-α, IFN-β, IFN-γ, inducible nitric oxide synthase (iNOS), interleukin (IL)-1β, IL-18 and IL-10 in spleen and bursa of Fabricius at different time points suggests that TLR-Ls possibly triggered host responses through the expression of IL-1β and IL-18 to reduce tumor formation. However, further studies are needed to explore the role of these pro-inflammatory cytokines and other influencing elements like lymphocytes in the hindrance of tumor development by TLR-Ls treatment in chickens.
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Affiliation(s)
- Jegarubee Bavananthasivam
- Department of Pathobiology, Ontario Veterinary College, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - Tamiru N Alkie
- Department of Pathobiology, Ontario Veterinary College, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - Jake Astill
- Department of Pathobiology, Ontario Veterinary College, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - Mohamed Faizal Abdul-Careem
- Department of Ecosystem and Public Health, Faculty of Veterinary Medicine, University of Calgary, Calgary, Alberta T2N 4N1, Canada
| | - Sarah K Wootton
- Department of Pathobiology, Ontario Veterinary College, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - Shahriar Behboudi
- The Pirbright Institute, Ash Road, Pirbright, Woking, Surrey GU24 0NF, United Kingdom; Department of Pathology and Infectious Disease, School of Veterinary Medicine, University of Surrey, Guildford, United Kingdom
| | - Alexander Yitbarek
- Department of Pathobiology, Ontario Veterinary College, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - Shayan Sharif
- Department of Pathobiology, Ontario Veterinary College, University of Guelph, Guelph, Ontario N1G 2W1, Canada.
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20
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Zhao Q, Hu Y, Deng S, Yu P, Chen B, Wang Z, Han X. Cytidine-phosphate-guanosine oligodeoxynucleotides in combination with CD40 ligand decrease periodontal inflammation and alveolar bone loss in a TLR9-independent manner. J Appl Oral Sci 2018; 26:e20170451. [PMID: 29791566 PMCID: PMC5953564 DOI: 10.1590/1678-7757-2017-0451] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2017] [Accepted: 01/05/2018] [Indexed: 01/22/2023] Open
Abstract
Local administration of toll-like receptor 9 (TLR9), agonist cytidine-phosphate-guanosine oligodeoxynucleotide (CpG ODNs), and CD40 ligand (CD40L) can decrease ligature-induced periodontal inflammation and bone loss in wild type (WT) mouse.
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Affiliation(s)
- Qian Zhao
- Department of Stomatology, Beijing ChaoYang Hospital, Capital Medical University, Beijing, China
| | - Yang Hu
- Department of Immunology and Infectious Diseases, The Forsyth Institute, Cambridge, MA, USA
| | - Shu Deng
- Department of Immunology and Infectious Diseases, The Forsyth Institute, Cambridge, MA, USA
| | - Pei Yu
- Department of Immunology and Infectious Diseases, The Forsyth Institute, Cambridge, MA, USA
| | - Bowen Chen
- Winchester High School, Winchester, MA, USA
| | - Zuomin Wang
- Department of Stomatology, Beijing ChaoYang Hospital, Capital Medical University, Beijing, China
| | - Xiaozhe Han
- Department of Immunology and Infectious Diseases, The Forsyth Institute, Cambridge, MA, USA
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21
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Soleimani Roudi P, Golian A, Haghparast A, Bassami MR, Majidzadeh Heravi R. Effect of adjuvants on in ovo vaccination against Newcastle disease on hatchability, performance and antibody titres in commercial pullets. J Anim Physiol Anim Nutr (Berl) 2018; 102:977-985. [DOI: 10.1111/jpn.12903] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2017] [Accepted: 03/23/2018] [Indexed: 01/19/2023]
Affiliation(s)
- P. Soleimani Roudi
- Faculty of Agriculture; Department of Animal Sciences; Ferdowsi University of Mashhad; Mashhad Iran
| | - A. Golian
- Faculty of Agriculture; Department of Animal Sciences; Ferdowsi University of Mashhad; Mashhad Iran
| | - A. Haghparast
- Faculty of Veterinary Medicine; Department of Pathobiology; Ferdowsi University of Mashhad; Mashhad Iran
| | - M. R. Bassami
- Faculty of Veterinary Medicine; Department of Clinical Sciences; Ferdowsi University of Mashhad; Mashhad Iran
| | - R. Majidzadeh Heravi
- Faculty of Agriculture; Department of Animal Sciences; Ferdowsi University of Mashhad; Mashhad Iran
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22
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Ahmed-Hassan H, Abdul-Cader MS, De Silva Senapathi U, Sabry MA, Hamza E, Nagy E, Sharif S, Abdul-Careem MF. Potential mediators of in ovo delivered double stranded (ds) RNA-induced innate response against low pathogenic avian influenza virus infection. Virol J 2018. [PMID: 29530062 PMCID: PMC5848551 DOI: 10.1186/s12985-018-0954-2] [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] [Indexed: 12/15/2022] Open
Abstract
Background Toll like receptor (TLR) 3 is a critically important innate pattern recognizing receptor that senses many viral infections. Although, it has been shown that double stranded (ds) RNA can be used for the stimulation of TLR3 signaling pathway in a number of host-viral infection models, it’s effectiveness as an antiviral agent against low pathogenic avian influenza virus (LPAIV) needs further investigation. Methods In this study, first, we delivered TLR3 ligand, dsRNA, in ovo at embryo day (ED)18 since in ovo route is routinely used for vaccination against poultry viral and parasitic infections and infected with H4N6 LPAIV 24-h post-treatment. A subset of in ovo dsRNA treated and control groups were observed for the expressions of TLR3 and type I interferon (IFN)s, mRNA expression of interleukin (IL)-1β and macrophage recruitment coinciding with the time of H4N6 LPAIV infection (24 h post-treatment). Additionally, Day 1 chickens were given dsRNA intra-tracheally along with a control group and a subset of chickens were infected with H4N6 LPAIV 24-h post-treatment whereas the rest of the animals were observed for macrophage and type 1 IFN responses coinciding with the time of viral infection. Results Our results demonstrate that the pre-hatch treatment of eggs with dsRNA reduces H4N6 replication in lungs. Further studies revealed that in ovo delivery of dsRNA increases TLR3 expression, type I IFN production and number of macrophages in addition to mRNA expression of IL-1β in lung 24-h post-treatment. The same level of induction of innate response was not evident in the spleen. Moreover, we discovered that dsRNA elicits antiviral response against LPAIV correlating with type I IFN activity in macrophages in vitro. Post-hatch, we found no difference in H4N6 LPAIV genome loads between dsRNA treated and control chickens although we observed higher macrophage recruitment and IFN-β response coinciding with the time of viral infection. Conclusions Our findings imply that the TLR3 ligand, dsRNA has antiviral activity in ovo and in vitro but not in chickens post-hatch and dsRNA-mediated innate host response is characterized by macrophage recruitment and expressions of TLR3 and type 1 IFNs.
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Affiliation(s)
- Hanaa Ahmed-Hassan
- Department of Ecosystem and Public Health, University of Calgary, Health Research Innovation Center 2C53, 3330 Hospital Drive NW, Calgary, AB, T2N 4N1, Canada.,Zoonoses Department, Faculty of Veterinary Medicine, Cairo University, Giza, 12211, Egypt
| | - Mohamed Sarjoon Abdul-Cader
- Department of Ecosystem and Public Health, University of Calgary, Health Research Innovation Center 2C53, 3330 Hospital Drive NW, Calgary, AB, T2N 4N1, Canada
| | - Upasama De Silva Senapathi
- Department of Ecosystem and Public Health, University of Calgary, Health Research Innovation Center 2C53, 3330 Hospital Drive NW, Calgary, AB, T2N 4N1, Canada
| | - Maha Ahmed Sabry
- Zoonoses Department, Faculty of Veterinary Medicine, Cairo University, Giza, 12211, Egypt
| | - Eman Hamza
- Zoonoses Department, Faculty of Veterinary Medicine, Cairo University, Giza, 12211, Egypt
| | - Eva Nagy
- Department of Pathobiology, University of Guelph, Guelph, ON, N1G 2W1, Canada
| | - Shayan Sharif
- Department of Pathobiology, University of Guelph, Guelph, ON, N1G 2W1, Canada
| | - Mohamed Faizal Abdul-Careem
- Department of Ecosystem and Public Health, University of Calgary, Health Research Innovation Center 2C53, 3330 Hospital Drive NW, Calgary, AB, T2N 4N1, Canada.
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23
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Abdul-Cader MS, Amarasinghe A, Palomino-Tapia V, Ahmed-Hassan H, Bakhtawar K, Nagy E, Sharif S, Gomis S, Abdul-Careem MF. In ovo CpG DNA delivery increases innate and adaptive immune cells in respiratory, gastrointestinal and immune systems post-hatch correlating with lower infectious laryngotracheitis virus infection. PLoS One 2018. [PMID: 29513732 PMCID: PMC5841808 DOI: 10.1371/journal.pone.0193964] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Cytosine-guanosine deoxynucleotides (CpG) DNA can be delivered in ovo at embryo day (ED)18 for the stimulation of toll-like receptor (TLR)21 signaling pathway that ultimately protects chickens against a number of bacterial and viral infections. There is a dearth of information understanding the mechanisms of protection induced by in ovo delivered CpG DNA. The objective of this study was to determine the immune cell changes post-hatch following in ovo delivery of the TLR21 ligand, CpG DNA. In order to quantify changes of percentage of KUL01+, IgM+ B, cluster of differentiation (CD)4+ and CD8α+ cells, trachea, lung, duodenum, large intestine, spleen and bursa of Fabricius were collected on day 1 post-hatch. We found increased recruitments of KUL01+ cells, in organs of these body systems post-hatch following in ovo delivery of CpG DNA. Although IgM+ B cells, CD4+ and CD8α+ cells were increased in lungs and immune system organs, these cells were not quantifiable from the trachea, duodenum and large intestine immediately following the hatch. Furthermore, when CpG DNA is delivered in ovo and subsequently infected with infectious laryngotracheitis virus (ILTV) post-hatch on day 1, CpG DNA reduces morbidity and mortality resulting from ILTV infection. This study provides insights into the mechanisms of host responses elicited following in ovo delivery of CpG DNA in avian species.
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Affiliation(s)
- Mohamed Sarjoon Abdul-Cader
- Health Research Innovation Center, Department of Ecosystem and Public Health, Faculty of Veterinary Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Aruna Amarasinghe
- Health Research Innovation Center, Department of Ecosystem and Public Health, Faculty of Veterinary Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Victor Palomino-Tapia
- Health Research Innovation Center, Department of Ecosystem and Public Health, Faculty of Veterinary Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Hanaa Ahmed-Hassan
- Health Research Innovation Center, Department of Ecosystem and Public Health, Faculty of Veterinary Medicine, University of Calgary, Calgary, Alberta, Canada
- Zoonoses Department, Faculty of Veterinary Medicine, Cairo University, Giza, Egypt
| | - Khawaja Bakhtawar
- Health Research Innovation Center, Department of Ecosystem and Public Health, Faculty of Veterinary Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Eva Nagy
- Department of Pathobiology, University of Guelph, Guelph, Ontario, Canada
| | - Shayan Sharif
- Department of Pathobiology, University of Guelph, Guelph, Ontario, Canada
| | - Susantha Gomis
- Department of Veterinary Pathology, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Mohamed Faizal Abdul-Careem
- Health Research Innovation Center, Department of Ecosystem and Public Health, Faculty of Veterinary Medicine, University of Calgary, Calgary, Alberta, Canada
- * E-mail:
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Induction of innate host responses characterized by production of interleukin (IL)-1β and recruitment of macrophages to the respiratory tract of chickens following infection with infectious bronchitis virus (IBV). Vet Microbiol 2018; 215:1-10. [PMID: 29426399 DOI: 10.1016/j.vetmic.2018.01.001] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2017] [Revised: 01/01/2018] [Accepted: 01/02/2018] [Indexed: 12/16/2022]
Abstract
Infectious bronchitis virus (IBV) infection is a major cause of economic losses to the poultry industry. Due to limitations in current control measures, alternative approaches, based on thorough understanding of the host responses are required. As one of the key component of the avian immune system, the innate immune system has a crucial role in limiting virus replication at the initial stage of the infection. As parts of the innate host response, macrophages and cytokines, such as interleukin (IL)-1β, are critical components as shown in other host-virus infection models. Since information on the importance of macrophages and IL-1β in IBV infection in chickens is limited, our objective was to determine the association of IL-1β, originating from avian macrophages and IBV infection in the trachea and lung. Following experimental IBV infection in 6 days old chickens, we found increased production of IL-1β and increased recruitment of macrophages in the respiratory tract. Towards the end of the study (5 and 7 days following the IBV infection), the recruited macrophages appear to be a significant source IL-1β. However, only the recruitment of macrophages in the lung correlated with IBV genome loads in this tissue. In conclusion, the present study demonstrates that recruitment of macrophages and the production of IL-1β originating from macrophages, as well as other sources, occur following IBV infection in the respiratory tract suggesting potential roles of these mediators in the host responses to IBV infection. However, further studies are warranted to elucidate whether macrophages and IL-1β are the causes of reduced IBV genome loads in the respiratory tract and also to investigate whether immune mediators that were not measured in the current study were involved in reducing IBV genome load in the respiratory tract towards the end of the study.
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Infectious Laryngotracheitis Virus Viral Chemokine-Binding Protein Glycoprotein G Alters Transcription of Key Inflammatory Mediators In Vitro and In Vivo. J Virol 2017; 92:JVI.01534-17. [PMID: 29070686 DOI: 10.1128/jvi.01534-17] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2017] [Accepted: 10/11/2017] [Indexed: 01/05/2023] Open
Abstract
Infectious laryngotracheitis virus (ILTV) is an alphaherpesvirus that infects chickens, causing upper respiratory tract disease and significant losses to poultry industries worldwide. Glycoprotein G (gG) is a broad-range viral chemokine-binding protein conserved among most alphaherpesviruses, including ILTV. A number of studies comparing the immunological parameters between infection with gG-expressing and gG-deficient ILTV strains have demonstrated that expression of gG is associated with increased virulence, modification of the amount and the composition of the inflammatory response, and modulation of the immune responses toward antibody production and away from cell-mediated immune responses. The aims of the current study were to examine the establishment of infection and inflammation by ILTV and determine how gG influences that response to infection. In vitro infection studies using tracheal organ tissue specimen cultures and blood-derived monocytes and in vivo infection studies in specific-pathogen-free chickens showed that leukocyte recruitment to the site of infection is an important component of the induced pathology and that this is influenced by the expression of ILTV gG and changes in the transcription of the chicken orthologues of mammalian CXC chemokine ligand 8 (CXCL8), chicken CXCLi1 and chicken CXCLi2, among other cytokines and chemokines. The results from this study demonstrate that ILTV gG interferes with chemokine and cytokine transcription at different steps of the inflammatory cascade, thus altering inflammation, virulence, and the balance of the immune response to infection.IMPORTANCE Infectious laryngotracheitis virus is an alphaherpesvirus that expresses gG, a conserved broad-range viral chemokine-binding protein known to interfere with host immune responses. However, little is known about how gG modifies virulence and influences the inflammatory signaling cascade associated with infection. Here, data from in vitro and in vivo infection studies are presented. These data show that gG has a direct impact on the transcription of cytokines and chemokine ligands in vitro (such as chicken CXCL8 orthologues, among others), which explains the altered balance of the inflammatory response that is associated with gG during ILTV infection of the upper respiratory tract of chickens. This is the first report to associate gG with the dysregulation of cytokine transcription at different stages of the inflammatory cascade triggered by ILTV infection of the natural host.
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Abdul-Cader MS, Palomino-Tapia V, Amarasinghe A, Ahmed-Hassan H, De Silva Senapathi U, Abdul-Careem MF. Hatchery Vaccination Against Poultry Viral Diseases: Potential Mechanisms and Limitations. Viral Immunol 2017; 31:23-33. [PMID: 28714781 DOI: 10.1089/vim.2017.0050] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
Commercial broiler and layer chickens are heavily vaccinated against economically important viral diseases with a view of preventing morbidity, mortality, and production impacts encountered during short production cycles. Hatchery vaccination is performed through in ovo embryo vaccination prehatch or spray and subcutaneous vaccinations performed at the day of hatch before the day-old chickens are being placed in barns with potentially contaminated environments. Commercially, multiple vaccines (e.g., live, live attenuated, and viral vectored vaccines) are available to administer through these routes within a short period (embryo day 18 prehatch to day 1 posthatch). Although the ability to mount immune response, especially the adaptive immune response, is not optimal around the hatch, it is possible that the efficacy of these vaccines depends partly on innate host responses elicited in response to replicating vaccine viruses. This review focuses on the current knowledge of hatchery vaccination in poultry and potential mechanisms of hatchery vaccine-mediated protective responses and limitations.
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Affiliation(s)
- Mohamed Sarjoon Abdul-Cader
- Department of Ecosystem and Public Health, Faculty of Veterinary Medicine, Health Research Innovation Center 2C53, University of Calgary , Calgary, Canada
| | - Victor Palomino-Tapia
- Department of Ecosystem and Public Health, Faculty of Veterinary Medicine, Health Research Innovation Center 2C53, University of Calgary , Calgary, Canada
| | - Aruna Amarasinghe
- Department of Ecosystem and Public Health, Faculty of Veterinary Medicine, Health Research Innovation Center 2C53, University of Calgary , Calgary, Canada
| | - Hanaa Ahmed-Hassan
- Department of Ecosystem and Public Health, Faculty of Veterinary Medicine, Health Research Innovation Center 2C53, University of Calgary , Calgary, Canada
| | - Upasama De Silva Senapathi
- Department of Ecosystem and Public Health, Faculty of Veterinary Medicine, Health Research Innovation Center 2C53, University of Calgary , Calgary, Canada
| | - Mohamed Faizal Abdul-Careem
- Department of Ecosystem and Public Health, Faculty of Veterinary Medicine, Health Research Innovation Center 2C53, University of Calgary , Calgary, Canada
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27
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Abdul-Cader MS, Ahmed-Hassan H, Amarasinghe A, Nagy E, Sharif S, Abdul-Careem MF. Toll-like receptor (TLR)21 signalling-mediated antiviral response against avian influenza virus infection correlates with macrophage recruitment and nitric oxide production. J Gen Virol 2017; 98:1209-1223. [PMID: 28613150 DOI: 10.1099/jgv.0.000787] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
Cytosine-guanosinedeoxynucleotide (CpG) DNA can be used for the stimulation of the toll-like receptor (TLR)21 signalling pathway in avian species which ultimately leads to up-regulation of gene transcription for pro-inflammatory molecules including nitric oxide and recruitment of innate immune cells. The objective of this study was to determine the antiviral effect of NO, produced in response to in ovo delivery of CpG DNA, against avian influenza virus (AIV) infection. We found that when CpG DNA is delivered at embryo day (ED)18 in ovo and subsequently challenged with H4N6 AIV at ED19 pre-hatch and day 1 post-hatching, CpG DNA reduces H4N6 AIV replication associated with enhanced NO production and macrophage recruitment in lungs. In vitro, we showed that NO originating from macrophages is capable of eliciting an antiviral response against H4N6 AIV infection. This study provides insights into the mechanisms of CpG DNA-mediated antiviral response, particularly against AIV infection in avian species.
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Affiliation(s)
- Mohamed Sarjoon Abdul-Cader
- Faculty of Veterinary Medicine, University of Calgary, Health Research Innovation Centre 2C53, 3330 Hospital Drive NW, Calgary, AB, Canada, AB T2N 4N1
| | - Hanaa Ahmed-Hassan
- Faculty of Veterinary Medicine, University of Calgary, Health Research Innovation Centre 2C53, 3330 Hospital Drive NW, Calgary, AB, Canada, AB T2N 4N1
| | - Aruna Amarasinghe
- Faculty of Veterinary Medicine, University of Calgary, Health Research Innovation Centre 2C53, 3330 Hospital Drive NW, Calgary, AB, Canada, AB T2N 4N1
| | - Eva Nagy
- Department of Pathobiology, University of Guelph, Guelph, ON, Canada, ON N1G 2W1
| | - Shayan Sharif
- Department of Pathobiology, University of Guelph, Guelph, ON, Canada, ON N1G 2W1
| | - Mohamed Faizal Abdul-Careem
- Faculty of Veterinary Medicine, University of Calgary, Health Research Innovation Centre 2C53, 3330 Hospital Drive NW, Calgary, AB, Canada, AB T2N 4N1
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28
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Abdul-Cader MS, Amarasinghe A, Abdul-Careem MF. Activation of toll-like receptor signaling pathways leading to nitric oxide-mediated antiviral responses. Arch Virol 2016; 161:2075-86. [PMID: 27233799 PMCID: PMC7087267 DOI: 10.1007/s00705-016-2904-x] [Citation(s) in RCA: 61] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2016] [Accepted: 05/17/2016] [Indexed: 02/07/2023]
Abstract
Toll-like receptors (TLRs), well-characterized pattern-recognizing receptors of the innate arm of the immune system, are vital in detecting pathogen-associated molecular patterns (PAMPs). The TLR-PAMP interaction initiates an intracellular signaling cascade, predominantly culminating in upregulation of antiviral components, including inducible nitric oxide synthase (iNOS). After activation, various TLR pathways can promote iNOS production via the myeloid differentiation primary response-88 (MyD-88) adapter protein. Subsequently, iNOS facilitates production of nitric oxide (NO), a highly reactive and potent antiviral molecule that can inhibit replication of RNA and DNA viruses. Furthermore, NO can diffuse freely across cell membranes and elicit antiviral mechanisms in various ways, including direct and indirect damage to viral genomes. This review emphasizes current knowledge of NO-mediated antiviral responses elicited after activation of TLR signaling pathways.
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Affiliation(s)
- Mohamed Sarjoon Abdul-Cader
- Department of Ecosystem and Public Health, Faculty of Veterinary Medicine, University of Calgary, Health Research Innovation Center 2C58, 3330 Hospital Drive NW, Calgary, AB, T2N 4N1, Canada
| | - Aruna Amarasinghe
- Department of Ecosystem and Public Health, Faculty of Veterinary Medicine, University of Calgary, Health Research Innovation Center 2C58, 3330 Hospital Drive NW, Calgary, AB, T2N 4N1, Canada
| | - Mohamed Faizal Abdul-Careem
- Department of Ecosystem and Public Health, Faculty of Veterinary Medicine, University of Calgary, Health Research Innovation Center 2C58, 3330 Hospital Drive NW, Calgary, AB, T2N 4N1, Canada.
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