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Oláh I, Felföldi B, Benyeda Z, Magyar A, Nagy N, Soós Á, Szőcs E. Life cycle of chicken bursal secretory dendritic cell (BSDC). Poult Sci 2024; 103:103640. [PMID: 38688195 PMCID: PMC11077032 DOI: 10.1016/j.psj.2024.103640] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Revised: 03/06/2024] [Accepted: 03/07/2024] [Indexed: 05/02/2024] Open
Abstract
The transmission electron microscopy revealed a dendritic cell in the medulla of the chicken bursal follicle. This dendritic cell has a classical secretory machinery; therefore, it has been named a bursal secretory dendritic cell (BSDC). The corticomedullary epithelial arch (CMEA) encloses lymphoid-like cells, which can proliferate and after entering the medulla, begin to differentiate to immature, then mature BSDC, which discharges glycoprotein (gp). With the exhaustion of gp production, the BSDC rapidly transforms into a macrophage-like cell (Mal), which is an activated endocytic cell of innate immunity. The Mal drifts through the follicle-associated epithelium (FAE)-supporting cells into the FAE, and via FAE, the Mal is eliminated in the bursal lumen. The infectious bursal disease virus (IBDV) infection accelerates the maturation process of BSDC precursors, which results in acute emptying of CMEA and subsequently, numerous immature BSDC(s) emerge. The IBDV infection stops the gp discharge, and the gp appears in the virus-containing Mal. The Movat pentachrome staining recognizes the gp in the extracellular spaces of the medulla and after infection in the Mal. The BSDC is the primary target of the IBDV. During IBDV infection, a large number of suddenly formed Mal actively migrate into the cortex, initiating cytokine storm and recruiting heterophil granulocytes. During embryogenesis, the vimentin-positive, possibly embryonic dendritic cells provide a microenvironment for carbohydrate switch. Around hatching, these embryonic, temporary dendritic cells get the Fc receptor, which bind maternal IgY. The posthatched forms of BSDC(s) gradually replace the embryonic ones and bind their own IgY.
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Affiliation(s)
- Imre Oláh
- Department of Anatomy, Histology and Embryology Semmelweis University 1094, Budapest, Hungary.
| | | | | | - Attila Magyar
- Department of Anatomy, Histology and Embryology Semmelweis University 1094, Budapest, Hungary
| | - Nándor Nagy
- Department of Anatomy, Histology and Embryology Semmelweis University 1094, Budapest, Hungary
| | - Ádám Soós
- Department of Anatomy, Histology and Embryology Semmelweis University 1094, Budapest, Hungary
| | - Emőke Szőcs
- Department of Anatomy, Histology and Embryology Semmelweis University 1094, Budapest, Hungary
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Melgoza-González EA, Bustamante-Córdova L, Hernández J. Recent advances in antigen targeting to antigen-presenting cells in veterinary medicine. Front Immunol 2023; 14:1080238. [PMID: 36969203 PMCID: PMC10038197 DOI: 10.3389/fimmu.2023.1080238] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2022] [Accepted: 02/27/2023] [Indexed: 03/12/2023] Open
Abstract
Advances in antigen targeting in veterinary medicine have gained traction over the years as an alternative approach for diseases that remain a challenge for traditional vaccines. In addition to the nature of the immunogen, antigen-targeting success relies heavily on the chosen receptor for its direct influence on the elicited response that will ensue after antigen uptake. Different approaches using antibodies, natural or synthetic ligands, fused proteins, and DNA vaccines have been explored in various veterinary species, with pigs, cattle, sheep, and poultry as the most frequent models. Antigen-presenting cells can be targeted using a generic approach, such as broadly expressed receptors such as MHC-II, CD80/86, CD40, CD83, etc., or focused on specific cell populations such as dendritic cells or macrophages (Langerin, DC-SIGN, XCR1, DC peptides, sialoadhesin, mannose receptors, etc.) with contrasting results. Interestingly, DC peptides show high specificity to DCs, boosting activation, stimulating cellular and humoral responses, and a higher rate of clinical protection. Likewise, MHC-II targeting shows consistent results in enhancing both immune responses; an example of this strategy of targeting is the approved vaccine against the bovine viral diarrhea virus in South America. This significant milestone opens the door to continuing efforts toward antigen-targeting vaccines to benefit animal health. This review discusses the recent advances in antigen targeting to antigen-presenting cells in veterinary medicine, with a special interest in pigs, sheep, cattle, poultry, and dogs.
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Zhi W, Chen H, Bai B, Jia Z, Pan X, Wang B, Kong R, Liu Q, Ma C, Ma D. Combined oral immunization with probiotics Entercoccus faecalis delivering surface-anchored Eimeria tenella proteins provide protective efficacies against homologous infection in chickens. Front Immunol 2022; 13:1042143. [PMID: 36311704 PMCID: PMC9606674 DOI: 10.3389/fimmu.2022.1042143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2022] [Accepted: 09/29/2022] [Indexed: 11/16/2022] Open
Abstract
Background and Objectives Avian coccidiosis is an intestinal parasitic disease exerting a highly negative impact on the global poultry industry. The aim of the present study is to evaluate the immune protective efficacies against Eimeria tenella infection in chickens orally immunized with combined recombinant probiotics Entercoccus faecalis (E. faecalis) delivering surface-anchored E. tenella proteins. Methods Four kinds of novel probiotics vaccines that surface-expressing four Eimeria tenella (E. tenella) proteins EtAMA1, EtIMP1, EtMIC2 and Et3-1E were produced, respectively. The expression of four target proteins on the surface of recombinant bacteria was detected by Western blot and indirect immunofluorescence assay (IFA). Then the four kinds of recombinant E. faecalis were combined to immunize chickens via oral route in different combinations. The immunizations were performed three times at two-week intervals, and each for three consecutive days. After immunizations, chickens in each immunized group were orally challenged with E. tenella sporulated oocysts. The immune responses and protective efficacies against homologous infection were evaluated. Results The results showed that three or four live recombinant E. faecalis induced effective antigen-specific humoral, intestinal mucosal immune responses, stimulated peripheral T lymphocytes proliferation, and displayed partial protections against homologous challenge as measured by cecal lesions, oocyst shedding, and body weight gain (BWG). Notably, higher levels of protective efficacies were observed when the four recombinant E. faecalis delivering target proteins were combined. Conclusion Chickens orally administrated with three or four, especially the four combined recombinant E. faecalis stimulated specific immune responses, which provided anti-coccidial effects. This study offers an idea for future development of novel vaccines based on multi-antigens delivered by probiotic bacteria.
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Affiliation(s)
- Wenjing Zhi
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, China
- Heilongjiang Provincial Key Laboratory of Pathogenic Mechanism for Animal Disease and Comparative Medicine, College of Veterinary Medicine, Northeast Agricultural University, Harbin, China
| | - Hang Chen
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, China
- Heilongjiang Provincial Key Laboratory of Pathogenic Mechanism for Animal Disease and Comparative Medicine, College of Veterinary Medicine, Northeast Agricultural University, Harbin, China
| | - Bingrong Bai
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, China
- Heilongjiang Provincial Key Laboratory of Pathogenic Mechanism for Animal Disease and Comparative Medicine, College of Veterinary Medicine, Northeast Agricultural University, Harbin, China
| | - Zhipeng Jia
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, China
- Heilongjiang Provincial Key Laboratory of Pathogenic Mechanism for Animal Disease and Comparative Medicine, College of Veterinary Medicine, Northeast Agricultural University, Harbin, China
| | - Xinghui Pan
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, China
- Heilongjiang Provincial Key Laboratory of Pathogenic Mechanism for Animal Disease and Comparative Medicine, College of Veterinary Medicine, Northeast Agricultural University, Harbin, China
| | - Biao Wang
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, China
- Heilongjiang Provincial Key Laboratory of Pathogenic Mechanism for Animal Disease and Comparative Medicine, College of Veterinary Medicine, Northeast Agricultural University, Harbin, China
| | - Rui Kong
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, China
- Heilongjiang Provincial Key Laboratory of Pathogenic Mechanism for Animal Disease and Comparative Medicine, College of Veterinary Medicine, Northeast Agricultural University, Harbin, China
| | - Qiuju Liu
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, China
- Heilongjiang Provincial Key Laboratory of Pathogenic Mechanism for Animal Disease and Comparative Medicine, College of Veterinary Medicine, Northeast Agricultural University, Harbin, China
| | - Chunli Ma
- College of Food Science, Northeast Agricultural University, Harbin, China
- *Correspondence: Dexing Ma, ; Chunli Ma,
| | - Dexing Ma
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, China
- Heilongjiang Provincial Key Laboratory of Pathogenic Mechanism for Animal Disease and Comparative Medicine, College of Veterinary Medicine, Northeast Agricultural University, Harbin, China
- *Correspondence: Dexing Ma, ; Chunli Ma,
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Dong J, Zhou Y, Pu J, Liu L. Status and Challenges for Vaccination against Avian H9N2 Influenza Virus in China. Life (Basel) 2022; 12:1326. [PMID: 36143363 PMCID: PMC9505450 DOI: 10.3390/life12091326] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2022] [Revised: 08/23/2022] [Accepted: 08/24/2022] [Indexed: 12/14/2022] Open
Abstract
In China, H9N2 avian influenza virus (AIV) has become widely prevalent in poultry, causing huge economic losses after secondary infection with other pathogens. Importantly, H9N2 AIV continuously infects humans, and its six internal genes frequently reassort with other influenza viruses to generate novel influenza viruses that infect humans, threatening public health. Inactivated whole-virus vaccines have been used to control H9N2 AIV in China for more than 20 years, and they can alleviate clinical symptoms after immunization, greatly reducing economic losses. However, H9N2 AIVs can still be isolated from immunized chickens and have recently become the main epidemic subtype. A more effective vaccine prevention strategy might be able to address the current situation. Herein, we analyze the current status and vaccination strategy against H9N2 AIV and summarize the progress in vaccine development to provide insight for better H9N2 prevention and control.
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Melgoza-gonzález EA, Reséndiz-sandoval M, Hinojosa-trujillo D, Hernández-valenzuela S, García-vega M, Mata-haro V, Tepale-segura A, Bonifaz LC, Perez-torres A, Hernández J. Antigen Targeting of Porcine Skin DEC205+ Dendritic Cells. Vaccines (Basel) 2022; 10:684. [PMID: 35632440 PMCID: PMC9147619 DOI: 10.3390/vaccines10050684] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2022] [Revised: 04/21/2022] [Accepted: 04/22/2022] [Indexed: 01/25/2023] Open
Abstract
Dendritic cell (DC) targeting by DEC205+ cells effectively promotes the internalization of antigens that may trigger a specific immune response. In this study, we evaluated the ability of a recombinant antibody, anti-DEC205 (rAb ZH9F7), to trigger cellular endocytosis in subpopulations of DCs and targeted cells after intradermal injection and subsequent migration toward lymph nodes. Furthermore, the cellular immune response was evaluated in pigs after intradermal application of the antigenized rAb ZH9F7 combined with porcine circovirus type 2 cap antigen (rAb ZH9F7-Cap). We demonstrated that rAb ZH9F7 recognized conventional type 1 and 2 DCs from the blood and skin and monocytes. It promoted receptor-mediated endocytosis and migration of cDCs and moDCs toward regional lymph nodes. Intradermal application of rAb ZH9F7-Cap induced a higher frequency of IFN-γ-secreting CD4+CD8+ T lymphocytes and antibodies against Cap protein than that in the control group. In conclusion, the rAb ZH9F7-Cap system promoted the target of skin cDC1 and cDC2, provoking migration to the regional lymph nodes and inducing a Th1 response, as evidenced by the proliferation of double-positive CD4+CD8+ T cells, which correlates with an enhanced ability to target the cDC1 subset both in vitro and in vivo.
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Shrestha A, Meeuws R, Sadeyen JR, Chang P, Van Hulten M, Iqbal M. Haemagglutinin antigen selectively targeted to chicken CD83 overcomes interference from maternally derived antibodies in chickens. NPJ Vaccines 2022; 7:33. [PMID: 35241682 PMCID: PMC8894371 DOI: 10.1038/s41541-022-00448-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2021] [Accepted: 01/24/2022] [Indexed: 11/09/2022] Open
Abstract
Maternally derived antibodies (MDAs) are important for protecting chickens against pathogens in the neonatal stage however, they often interfere with vaccine performance. Here, we investigated the effects of MDAs on a targeted antigen delivery vaccine (TADV), which is developed by conjugating H9 subtype avian influenza virus haemagglutinin (HA) antigen to single chain fragment variable (scFv) antibodies specific for the chicken antigen presenting cell receptor CD83. Groups of 1-day-old chickens carrying high levels of MDAs (MDA++) and 14-day old chickens carrying medium levels of MDAs (MDA+) were immunised with TADV (rH9HA-CD83 scFv), untargeted rH9HA or inactivated H9N2 vaccines. Immunogenicity in these vaccinated chickens was compared using haemagglutination inhibition (HI) and enzyme-linked immunosorbent assays (ELISA). The results showed that the TADV (rH9HA-CD83 scFv) induced significantly higher levels of H9HA-specific antibody titres compared to the untargeted rH9HA and inactivated H9N2 vaccines in MDA++ and MDA+ chickens. Overall, the data demonstrates immune responses induced by TADV are not affected by the MDA in chickens.
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Affiliation(s)
- Angita Shrestha
- The Pirbright Institute, Ash Road, Pirbright, Woking, Surrey, GU24 0NF, UK
- Department of Zoology, Peter Medawar Building, South Parks Road, University of Oxford, Oxford, OX1 3SY, UK
- GlaxoSmithKline, Gunnels Wood Rd, Stevenage, SG1 2NY, UK
| | - Rick Meeuws
- Global Poultry R&D Biologicals Boxmeer, Intervet International BV, MSD Animal Health, Wim De Körverstraat 35, 5831 AN, Boxmeer, The Netherlands
| | - Jean-Remy Sadeyen
- The Pirbright Institute, Ash Road, Pirbright, Woking, Surrey, GU24 0NF, UK
| | - Pengxiang Chang
- The Pirbright Institute, Ash Road, Pirbright, Woking, Surrey, GU24 0NF, UK
| | - Marielle Van Hulten
- Global Poultry R&D Biologicals Boxmeer, Intervet International BV, MSD Animal Health, Wim De Körverstraat 35, 5831 AN, Boxmeer, The Netherlands
| | - Munir Iqbal
- The Pirbright Institute, Ash Road, Pirbright, Woking, Surrey, GU24 0NF, UK.
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Feng H, Yang X, Fan J, Zhang L, Liu Q, Chai D. DEC-205 receptor-mediated long-circling nanoliposome as an antigen and Eucommia ulmoides polysaccharide delivery system enhances the immune response via facilitating dendritic cells maturation. Drug Deliv 2021; 27:1581-1596. [PMID: 33169636 PMCID: PMC7655039 DOI: 10.1080/10717544.2020.1844343] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
DEC-205 receptor-mediated dendritic cells (DC) targeting nanoliposomes is a promising delivery system in eliciting an immune response against pathogens. When this delivery system carries both antigen and immunomodulator, it can effectively regulate the DC function as well as the initial T cell response. To maximize the desired therapeutic effects of Eucommia ulmoides Oliv. polysaccharides (EUPS), and induce an efficient humoral and cellular immune response against an antigen, we encapsulated the OVA and EUPS in long-circling nanoliposomes and conjugated it with anti-DEC-205 receptor antibody to obtain a DEC-205-targeted nanoliposomes (anti-DEC-205-EUPS-OVA-LPSM). The physicochemical properties and immune-modulating effects were investigated in vitro and in vivo by a series of the experiment to evaluate the targeting efficiency of anti-DEC-205-EUPS-OVA-LPSM. In vitro, anti-DEC-205-EUPS-OVA-LPSM (160 μg mL−1) could enhance DCs proliferation and increase their phagocytic efficiency. In vivo anti-DEC-205-EUPS-OVA-LPSM remarkably promoted the OVA-specific IgG and IgG isotypes levels, enhanced the splenocyte proliferation, and induced the NK cell and CTL cytotoxicity. Besides, the anti-DEC-205-EUPS-OVA-LPSM enhanced the maturation of DCs. These findings suggest that the DEC-205 receptor antibody-conjugated EUPS nanoliposome can act as an efficient antigen delivery system to enhance the cellular and humoral immune response by promoting DC maturation. This indicates that the anti-DEC-205-EUPS-OVA-LPSM has significant potential as an immune-enhancing agent and antigen delivery system.
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Affiliation(s)
- Haibo Feng
- College of Animal Husbandry and Veterinary Medicine, Southwest Minzu University, Chengdu, P. R. China.,Key Laboratory of Ministry of Education and Sichuan Province for Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization, Chengdu, P. R. China
| | - Xiaonong Yang
- College of Animal Husbandry and Veterinary Medicine, Southwest Minzu University, Chengdu, P. R. China.,Key Laboratory of Ministry of Education and Sichuan Province for Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization, Chengdu, P. R. China
| | - Jing Fan
- Sichuan Industrial Institute of Antibiotics, Chengdu University, Chengdu, P. R. China
| | - Linzi Zhang
- College of Animal Husbandry and Veterinary Medicine, Southwest Minzu University, Chengdu, P. R. China.,Key Laboratory of Ministry of Education and Sichuan Province for Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization, Chengdu, P. R. China
| | - Qianqian Liu
- College of Animal Husbandry and Veterinary Medicine, Southwest Minzu University, Chengdu, P. R. China.,Key Laboratory of Ministry of Education and Sichuan Province for Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization, Chengdu, P. R. China
| | - Dongkun Chai
- Department of Veterinary Medicine, Southwest University, Rongchang, P. R. China
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Shrestha A, Sadeyen JR, Lukosaityte D, Chang P, Smith A, Van Hulten M, Iqbal M. Selectively targeting haemagglutinin antigen to chicken CD83 receptor induces faster and stronger immunity against avian influenza. NPJ Vaccines 2021; 6:90. [PMID: 34267228 PMCID: PMC8282863 DOI: 10.1038/s41541-021-00350-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2021] [Accepted: 06/11/2021] [Indexed: 02/06/2023] Open
Abstract
The immunogenicity and protective efficacy of vaccines can be enhanced by the selective delivery of antigens to the antigen-presenting cells (APCs). In this study, H9N2 avian influenza virus haemagglutinin (HA) antigen, was targeted by fusing it to single-chain fragment variable (scFv) antibodies specific to CD83 receptor expressed on chicken APCs. We observed an increased level of IFNγ, IL6, IL1β, IL4, and CxCLi2 mRNA upon stimulation of chicken splenocytes ex vivo by CD83 scFv targeted H9HA. In addition, CD83 scFv targeted H9HA induced higher serum haemagglutinin inhibition activity and virus neutralising antibodies compared to untargeted H9HA, with induction of antibodies as early as day 6 post primary vaccination. Furthermore, chickens vaccinated with CD83 scFv targeted H9HA showed reduced H9N2 challenge virus shedding compared to untargeted H9HA. These results suggest that targeting antigens to CD83 receptors could improve the efficacy of poultry vaccines.
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Affiliation(s)
- Angita Shrestha
- grid.63622.330000 0004 0388 7540The Pirbright Institute, Pirbright, Woking, Surrey, United Kingdom ,grid.4991.50000 0004 1936 8948Department of Zoology, Peter Medawar Building, University of Oxford, Oxford, United Kingdom
| | - Jean-Remy Sadeyen
- grid.63622.330000 0004 0388 7540The Pirbright Institute, Pirbright, Woking, Surrey, United Kingdom
| | - Deimante Lukosaityte
- grid.63622.330000 0004 0388 7540The Pirbright Institute, Pirbright, Woking, Surrey, United Kingdom
| | - Pengxiang Chang
- grid.63622.330000 0004 0388 7540The Pirbright Institute, Pirbright, Woking, Surrey, United Kingdom
| | - Adrian Smith
- grid.4991.50000 0004 1936 8948Department of Zoology, Peter Medawar Building, University of Oxford, Oxford, United Kingdom
| | - Marielle Van Hulten
- grid.420097.80000 0004 0407 6096Global Poultry R&D Biologicals Boxmeer, Intervet International BV, MSD Animal Health, Boxmeer, The Netherlands
| | - Munir Iqbal
- grid.63622.330000 0004 0388 7540The Pirbright Institute, Pirbright, Woking, Surrey, United Kingdom
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Shrestha A, Sadeyen JR, Lukosaityte D, Chang P, Van Hulten M, Iqbal M. Targeting Haemagglutinin Antigen of Avian Influenza Virus to Chicken Immune Cell Receptors Dec205 and CD11c Induces Differential Immune-Potentiating Responses. Vaccines (Basel) 2021; 9:vaccines9070784. [PMID: 34358200 PMCID: PMC8310205 DOI: 10.3390/vaccines9070784] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2021] [Revised: 06/29/2021] [Accepted: 07/03/2021] [Indexed: 11/16/2022] Open
Abstract
Improving the immunogenicity and protective efficacy of vaccines is critical to reducing disease impacts. One strategy used to enhance the immunogenicity of vaccines is the selective delivery of protective antigens to the antigen presenting cells (APCs). In this study, we have developed a targeted antigen delivery vaccine (TADV) system by recombinantly fusing the ectodomain of hemagglutinin (HA) antigen of H9N2 influenza A virus to single chain fragment variable (scFv) antibodies specific for the receptors expressed on chicken APCs; Dec205 and CD11c. Vaccination of chickens with TADV containing recombinant H9HA Foldon-Dec205 scFv or H9HA Foldon-CD11c scFv proteins elicited faster (as early as day 6 post primary vaccination) and higher anti-H9HA IgM and IgY, haemagglutination inhibition, and virus neutralisation antibodies compared to the untargeted H9HA protein. Comparatively, CD11c scFv conjugated H9HA protein showed higher immunogenic potency compared to Dec205 scFv conjugated H9HA protein. The higher immune potentiating ability of CD11c scFv was also reflected in ex-vivo chicken splenocyte stimulation assay, whereby H9HA Foldon-CD11c scFv induced higher levels of cytokines (IFNγ, IL6, IL1β, and IL4) compared to H9HA Foldon-Dec205 scFv. Overall, the results conclude that TADV could be a better alternative to the currently available inactivated virus vaccines.
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Affiliation(s)
- Angita Shrestha
- The Pirbright Institute, Ash Road, Pirbright, Woking, Surrey GU24 0NF, UK; (A.S.); (J.-R.S.); (D.L.); (P.C.)
- Department of Zoology, Peter Medawar Building, South Parks Road, University of Oxford, Oxford OX1 3SY, UK
| | - Jean-Remy Sadeyen
- The Pirbright Institute, Ash Road, Pirbright, Woking, Surrey GU24 0NF, UK; (A.S.); (J.-R.S.); (D.L.); (P.C.)
| | - Deimante Lukosaityte
- The Pirbright Institute, Ash Road, Pirbright, Woking, Surrey GU24 0NF, UK; (A.S.); (J.-R.S.); (D.L.); (P.C.)
| | - Pengxiang Chang
- The Pirbright Institute, Ash Road, Pirbright, Woking, Surrey GU24 0NF, UK; (A.S.); (J.-R.S.); (D.L.); (P.C.)
| | - Marielle Van Hulten
- Global Poultry R&D Biologicals Boxmeer, Intervet International BV, MSD Animal Health, Wim De Körverstraat 35, 5831 AN Boxmeer, The Netherlands;
| | - Munir Iqbal
- The Pirbright Institute, Ash Road, Pirbright, Woking, Surrey GU24 0NF, UK; (A.S.); (J.-R.S.); (D.L.); (P.C.)
- Correspondence: or ; Tel.: +44-(0)-1483-231441
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Lindenwald DL, Lepenies B. C-Type Lectins in Veterinary Species: Recent Advancements and Applications. Int J Mol Sci 2020; 21:ijms21145122. [PMID: 32698416 PMCID: PMC7403975 DOI: 10.3390/ijms21145122] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2020] [Revised: 07/16/2020] [Accepted: 07/17/2020] [Indexed: 02/06/2023] Open
Abstract
C-type lectins (CTLs), a superfamily of glycan-binding receptors, play a pivotal role in the host defense against pathogens and the maintenance of immune homeostasis of higher animals and humans. CTLs in innate immunity serve as pattern recognition receptors and often bind to glycan structures in damage- and pathogen-associated molecular patterns. While CTLs are found throughout the whole animal kingdom, their ligand specificities and downstream signaling have mainly been studied in humans and in model organisms such as mice. In this review, recent advancements in CTL research in veterinary species as well as potential applications of CTL targeting in veterinary medicine are outlined.
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Larsen FT, Guldbrandtsen B, Christensen D, Pitcovski J, Kjærup RB, Dalgaard TS. Pustulan Activates Chicken Bone Marrow-Derived Dendritic Cells In Vitro and Promotes Ex Vivo CD4 + T Cell Recall Response to Infectious Bronchitis Virus. Vaccines (Basel) 2020; 8:E226. [PMID: 32429204 DOI: 10.3390/vaccines8020226] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2020] [Revised: 05/08/2020] [Accepted: 05/08/2020] [Indexed: 12/13/2022] Open
Abstract
Infectious bronchitis virus (IBV) is a highly contagious avian coronavirus. IBV causes substantial worldwide economic losses in the poultry industry. Vaccination with live-attenuated viral vaccines, therefore, are of critical importance. Live-attenuated viral vaccines, however, exhibit the potential for reversion to virulence and recombination with virulent field strains. Therefore, alternatives such as subunit vaccines are needed together with the identification of suitable adjuvants, as subunit vaccines are less immunogenic than live-attenuated vaccines. Several glycan-based adjuvants directly targeting mammalian C-type lectin receptors were assessed in vitro using chicken bone marrow-derived dendritic cells (BM-DCs). The β-1-6-glucan, pustulan, induced an up-regulation of MHC class II (MHCII) cell surface expression, potentiated a strong proinflammatory cytokine response, and increased endocytosis in a cation-dependent manner. Ex vivo co-culture of peripheral blood monocytes from IBV-immunised chickens, and BM-DCs pulsed with pustulan-adjuvanted recombinant IBV N protein (rN), induced a strong recall response. Pustulan-adjuvanted rN induced a significantly higher CD4+ blast percentage compared to either rN, pustulan or media. However, the CD8+ and TCRγδ+ blast percentage were significantly lower with pustulan-adjuvanted rN compared to pustulan or media. Thus, pustulan enhanced the efficacy of MHCII antigen presentation, but apparently not the cross-presentation on MHCI. In conclusion, we found an immunopotentiating effect of pustulan in vitro using chicken BM-DCs. Thus, future in vivo studies might show pustulan as a promising glycan-based adjuvant for use in the poultry industry to contain the spread of coronaviridiae as well as of other avian viral pathogens.
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Zmrhal V, Slama P. Immunomodulation of Avian Dendritic Cells under the Induction of Prebiotics. Animals (Basel) 2020; 10:E698. [PMID: 32316442 DOI: 10.3390/ani10040698] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Revised: 04/09/2020] [Accepted: 04/15/2020] [Indexed: 12/12/2022] Open
Abstract
Simple Summary Dendritic cells recognize pathogen-associated molecular patterns in chicken intestines and are part of the initial immune response. The immunoregulatory properties of prebiotics acting in several ways in poultry have been known for many years. According to their function, dendritic cells should play an indispensable role in the proven effects of prebiotics on the intestinal immune system, such as through activation of T and B cells and cytokine production. Currently, there are no studies concerning direct interactions in poultry between non-digestible feed components and dendritic cells. Whereas most in vitro experiments with chicken dendritic cells have studied their interactions with pathogens, in vitro studies are now needed to determine the impacts of prebiotics on the gastrointestinal dendritic cells themselves. The present lack of information in this area limits the development of effective feed additives for poultry production. The main purpose of this review is to explore ideas regarding potential mechanisms by which dendritic cells might harmonize the immune response after prebiotic supplementation and thereby provide a basis for future studies. Abstract Although the immunomodulatory properties of prebiotics were demonstrated many years ago in poultry, not all mechanisms of action are yet clear. Dendritic cells (DCs) are the main antigen-presenting cells orchestrating the immune response in the chicken gastrointestinal tract, and they are the first line of defense in the immune response. Despite the crucial role of DCs in prebiotic immunomodulatory properties, information is lacking about interaction between prebiotics and DCs in an avian model. Mannan-oligosaccharides, β-glucans, fructooligosaccharides, and chitosan-oligosaccharides are the main groups of prebiotics having immunomodulatory properties. Because pathogen-associated molecular patterns on these prebiotics are recognized by many receptors of DCs, prebiotics can mimic activation of DCs by pathogens. Short-chain fatty acids are products of prebiotic fermentation by microbiota, and their anti-inflammatory properties have also been demonstrated in DCs. This review summarizes current knowledge about avian DCs in the gastrointestinal tract, and for the first-time, their role in the immunomodulatory properties of prebiotics within an avian model.
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Zmrhal V, Slama P. Current knowledge about interactions between avian dendritic cells and poultry pathogens. Dev Comp Immunol 2020; 104:103565. [PMID: 31830703 DOI: 10.1016/j.dci.2019.103565] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2019] [Revised: 12/03/2019] [Accepted: 12/03/2019] [Indexed: 06/10/2023]
Abstract
In poultry production conditions today, birds are surrounded by viral, bacterial, and parasitic agents. DCs are the main antigen-presenting cells located in tissues of the body, and their role involves recognizing antigen structures, engulfing and processing them, and subsequently presenting antigen peptides on their surface by major histocompatibility complex, where T cells and B cells are stimulated and can begin appropriate cellular and antibody immune response. This unique function indicates that these cells can be used in producing vaccines, but first it is necessary to culture DCs in vitro to identify the principles of their interactions with pathogens. The following review summarizes our current knowledge about avian dendritic cells and their interactions with pathogens. It provides a basis for future studies of these unique cells and their use in vaccine development.
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Affiliation(s)
- Vladimir Zmrhal
- Department of Animal Morphology, Physiology and Genetics, Faculty of AgriSciences, Mendel University in Brno, Zemedelska 1, 613 00, Brno, Czech Republic
| | - Petr Slama
- Department of Animal Morphology, Physiology and Genetics, Faculty of AgriSciences, Mendel University in Brno, Zemedelska 1, 613 00, Brno, Czech Republic.
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Larsen FT, Bed'Hom B, Guldbrandtsen B, Dalgaard TS. Identification and tissue-expression profiling of novel chicken c-type lectin-like domain containing proteins as potential targets for carbohydrate-based vaccine strategies. Mol Immunol 2019; 114:216-225. [PMID: 31386978 DOI: 10.1016/j.molimm.2019.07.022] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2019] [Accepted: 07/25/2019] [Indexed: 12/14/2022]
Abstract
C-type lectin-like domain containing proteins (CTLDcps) mainly bind carbohydrate-based ligands, but also other ligands. CTLDcps are involved in several biological processes including cell adhesion, cell-cell interactions, and pathogen recognition. Pathogen recognition by myeloid cells, e.g. dendritic cells (DCs), can be facilitated through cell surface expressed CTLDcps. Cell surface expressed CTLDcps have been exploited in vaccine designs for specific targeting of human and mouse DCs using antibodies. In recent years, however, DC targeting using carbohydrate-based vaccines has gained interest due to low production cost, limited immunogenicity, and possibility of multivalent adjustment. In chicken, however, only a few CTLDcps have been identified. Identifying and annotating additional chicken CTLDcps (chCTLDcps) is needed to exploit carbohydrate-mediated DC targeting in chicken. Therefore, we searched the chicken GRCg6a assembly for novel chCTLDcps. We identified 28 chCTLDcps of which 10 had previously been described and also experimentally validated. RNA-seq and RT-qPCR confirmed mRNA expression of the remaining 18 identified chCTLDcps. A group of highly related chCTLDcps, moreover, was shown to be avian-specific and comprise novel members mapped to the proposed chicken natural killer gene complex. Two chCTLDcps, chCLEC17AL-A and chCLEC17AL-B, were found to share a recent common ancestor with CLEC17A. Putative mannose or fucose-binding sequence motifs, EPN and WND, were found in the CTLD of chCLEC17AL-A. Both contained intracellular internalisation and signalling sequence motifs. In conclusion, several chCTLDcps were identified and their expression confirmed. Both chCLEC17AL-A and -B showed promise as potential targets in carbohydrate-based chicken vaccine strategies. Determination of DC-specific expression of chCLEC17AL-A and -B, thus, might prove useful in chicken vaccinology.
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Affiliation(s)
- Frederik T Larsen
- Department of Animal Science, Aarhus University, Blichers Allé 20, 8830, Tjele, Denmark
| | - Bertrand Bed'Hom
- GABI, INRA, AgroParisTech, Université Paris-Saclay, 78350, Jouy-en-Josas, France
| | - Bernt Guldbrandtsen
- Department of Molecular Biology and Genetics, Blichers Allé 20, 8830, Tjele, Denmark
| | - Tina S Dalgaard
- Department of Animal Science, Aarhus University, Blichers Allé 20, 8830, Tjele, Denmark.
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Lin J, Wang Z, Wang J, Yang Q. Microarray analysis of infectious bronchitis virus infection of chicken primary dendritic cells. BMC Genomics 2019; 20:557. [PMID: 31286855 PMCID: PMC6615177 DOI: 10.1186/s12864-019-5940-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2018] [Accepted: 06/26/2019] [Indexed: 02/07/2023] Open
Abstract
Background Avian infectious bronchitis virus (IBV) is a major respiratory disease-causing agent in birds that leads to significant losses. Dendritic cells (DCs) are specialised cells responsible for sampling antigens and presenting them to T cells, which also play an essential role in recognising and neutralising viruses. Recent studies have suggested that non-coding RNAs may regulate the functional program of DCs. Expression of host non-coding RNAs changes markedly during infectious bronchitis virus infection, but their role in regulating host immune function has not been explored. Here, microarrays of mRNAs, miRNAs, and lncRNAs were globally performed to analyse how avian DCs respond to IBV. Results First, we found that IBV stimulation did not enhance the maturation ability of avian DCs. Interestingly, inactivated IBV was better able than IBV to induce DC maturation and activate lymphocytes. We identified 1093 up-regulated and 845 down-regulated mRNAs in IBV-infected avian DCs. Gene Ontology analysis suggested that cellular macromolecule and protein location (GO-BP) and transcription factor binding (GO-MF) were abundant in IBV-stimulated avian DCs. Meanwhile, pathway analysis indicated that the oxidative phosphorylation and leukocyte transendothelial migration signalling pathways might be activated in the IBV group. Moreover, alteration of microRNAs (miRNAs) and long non-coding RNAs (lncRNAs) was detected in IBV-stimulated avian DCs. In total, 19 significantly altered (7 up and 12 down) miRNAs and 101 (75 up and 26 down) lncRNAs were identified in the IBV-treated group. Further analysis showed that the actin cytoskeleton and MAPK signal pathway were related to the target genes of IBV-stimulated miRNAs. Finally, our study identified 2 TF-microRNA and 53 TF–microRNA–mRNA interactions involving 1 TF, 2 miRNAs, and 53 mRNAs in IBV-stimulated avian DCs. Conclusions Our research suggests a new mechanism to explain why IBV actively blocks innate responses needed for inducing immune gene expression and also provides insight into the pathogenic mechanisms of avian IBV. Electronic supplementary material The online version of this article (10.1186/s12864-019-5940-6) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Jian Lin
- College of Life Sciences, Nanjing Agricultural University, Wei gang 1, Nanjing, Jiangsu, 210095, People's Republic of China.,College of Veterinary medicine, Nanjing Agricultural University, Wei gang 1, Nanjing, Jiangsu, 210095, People's Republic of China
| | - Zhisheng Wang
- National Veterinary Product Engineering Research Center, Jiangsu Academy of Agricultural Sciences, Nanjing, China
| | - Jialu Wang
- College of Veterinary medicine, Nanjing Agricultural University, Wei gang 1, Nanjing, Jiangsu, 210095, People's Republic of China
| | - Qian Yang
- College of Life Sciences, Nanjing Agricultural University, Wei gang 1, Nanjing, Jiangsu, 210095, People's Republic of China. .,College of Veterinary medicine, Nanjing Agricultural University, Wei gang 1, Nanjing, Jiangsu, 210095, People's Republic of China.
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Bustamante-Córdova L, Reséndiz-Sandoval M, Hernández J. Evaluation of a Recombinant Mouse X Pig Chimeric Anti-Porcine DEC205 Antibody Fused with Structural and Nonstructural Peptides of PRRS Virus. Vaccines (Basel) 2019; 7:E43. [PMID: 31126125 DOI: 10.3390/vaccines7020043] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2019] [Accepted: 05/21/2019] [Indexed: 02/06/2023] Open
Abstract
Activation of the immune system using antigen targeting to the dendritic cell receptor DEC205 presents great potential in the field of vaccination. The objective of this work was to evaluate the immunogenicity and protectiveness of a recombinant mouse x pig chimeric antibody fused with peptides of structural and nonstructural proteins of porcine respiratory and reproductive syndrome virus (PRRSV) directed to DEC205+ cells. Priming and booster immunizations were performed three weeks apart and administered intradermally in the neck area. All pigs were challenged with PRRSV two weeks after the booster immunization. Immunogenicity was evaluated by assessing the presence of antibodies anti-PRRSV, the response of IFN-γ-producing CD4+ cells, and the proliferation of cells. Protection was determined by assessing the viral load in the blood, lungs, and tonsils using qRT-PCR. The results showed that the vaccine exhibited immunogenicity but conferred limited protection. The vaccine group had a lower viral load in the tonsils and a significantly higher production of antibodies anti-PRRSV than the control group (p < 0.05); the vaccine group also produced more CD4+IFN-γ+ cells in response to peptides from the M and Nsp2 proteins. In conclusion, this antigenized recombinant mouse x pig chimeric antibody had immunogenic properties that could be enhanced to improve the level of protection and vaccine efficiency.
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Jáuregui-Zúñiga D, Pedraza-Escalona M, Merino-Guzman R, Possani LD. Construction and expression of a single-chain variable fragment antibody against chicken DEC 205 for targeting the bacterial expressed hemagglutinin-neuraminidase of Newcastle disease virus. Vet Immunol Immunopathol 2019; 212:9-14. [PMID: 31213252 DOI: 10.1016/j.vetimm.2019.05.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2018] [Revised: 05/03/2019] [Accepted: 05/05/2019] [Indexed: 01/14/2023]
Abstract
Targeting antigens to endocytic receptors on the surface of dendritic cells is a new strategy for increasing the adaptive immune response. The objective of the current study was the construction and bacterial expression of a recombinant antibody single-chain fragment variable (ScFv) directed against chicken DEC 205, an endocytic receptor, for use in the genetic fusion of antigens. In particular, we use as antigen the hemagglutinin-neuraminidase (HN) of Newcastle disease virus. Our results show that inoculation of chickens with HN genetically fused to the ScFv anti-DEC 205 induced an evidently higher immune response against HN, in contrast to inoculation with unconjugated HN. In addition, neutralizing antibodies against Newcastle disease virus were detected only in the serum from chickens immunized with HN fused to ScFv anti-DEC 205. Inoculated fused antigens to ScFv against endocytic receptor DEC 205 resulted in a greater antibody-specific anti-HN production compared with antigens applied alone. The results of this study show that the strategy described here has the potential to be used in the development of more effective vaccines against infectious diseases in chickens.
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Affiliation(s)
- David Jáuregui-Zúñiga
- Departamento de Medicina Molecular y Bioprocesos, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Apartado Postal 510-3, Cuernavaca, Morelos 62210, México.
| | - Martha Pedraza-Escalona
- CONACYT-UDIBI-ENCB-Instituto Politecnico Nacional. Unidad Profesional Lázaro Cárdenas, Prolongación de Carpio y Plan de Ayala s/n, Col. Santo Tomás, Ciudad de México 11340, México
| | - Rubén Merino-Guzman
- Departamento de Medicina y Zootecnia de Aves, Facultad de Medicina Veterinaria y Zootecnia Universidad Nacional Autónoma de México, UNAM, C.U., Ciudad de México 04510, México
| | - Lourival D Possani
- Departamento de Medicina Molecular y Bioprocesos, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Apartado Postal 510-3, Cuernavaca, Morelos 62210, México
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Padilla-quirarte H, Badillo-godinez O, Gutierrez-xicotencatl L, Acevedo-betancur Y, Luna-andon J, Montiel-hernandez J, Lopez-guerrero D, Esquivel-guadarrama F. Targeting M2e to DEC-205 induces an enhanced serum antibody-dependent heterosubtypic protection against influenza A virus infection. Vaccine 2019; 37:2624-33. [DOI: 10.1016/j.vaccine.2019.02.050] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2018] [Revised: 01/23/2019] [Accepted: 02/15/2019] [Indexed: 01/07/2023]
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Vuong CN, Chou WK, Berghman LR. CD205-positive, Sepharose-induced peritoneal exudate cells: a new resource for DC research in the chicken. Vet Res Commun 2019; 43:115-22. [PMID: 30989431 DOI: 10.1007/s11259-019-09751-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2019] [Accepted: 03/22/2019] [Indexed: 10/27/2022]
Abstract
Dendritic cells (DC) are important antigen-presenting cells and are among the least characterized immune cells in the chicken. In order to obtain chicken DC, current protocols require isolation of bone marrow myeloid progenitor cells and induction of DC differentiation with supplemental cytokines or negative selection of splenic cell preparations. Chicken peritoneal exudate cells (PEC) have traditionally been a source of various immune cells for ex vivo studies, primarily to investigate heterophils and macrophages. In this study, we observe the presence of CD205+ PEC populations, a marker of DC, as an additional resource to isolate and study chicken primary DCs. A panel of monoclonal antibodies was developed against the chicken CD205 DC marker and used to isolate CD205+ DC from the PEC population using magnetic bead cell sorting. This study reports the development of new anti-CD205 monoclonal antibodies as a reagent for chicken DC research, as well as PEC as a potential source of CD205+ DC for ex vivo studies in the chicken.
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Shrestha A, Sadeyen JR, Iqbal M. Enhancing Protective Efficacy of Poultry Vaccines through Targeted Delivery of Antigens to Antigen-Presenting Cells. Vaccines (Basel) 2018; 6:E75. [PMID: 30445683 PMCID: PMC6313852 DOI: 10.3390/vaccines6040075] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2018] [Revised: 11/09/2018] [Accepted: 11/13/2018] [Indexed: 02/07/2023] Open
Abstract
Avian viral diseases including avian influenza, Marek's disease and Newcastle disease are detrimental to economies around the world that depend on the poultry trade. A significant zoonotic threat is also posed by avian influenza viruses. Vaccination is an important and widely used method for controlling these poultry diseases. However, the current vaccines do not provide full protection or sterile immunity. Hence, there is a need to develop improved vaccines. The major aim of developing improved vaccines is to induce strong and specific humoral and cellular immunity in vaccinated animals. One strategy used to enhance the immunogenicity of vaccines is the selective delivery of protective antigens to antigen-presenting cells (APCs) including dendritic cells, macrophages and B cells. APCs have a central role in the initiation and maintenance of immune responses through their ability to capture, process and present antigens to T and B cells. Vaccine technology that selectively targets APCs has been achieved by coupling antigens to monoclonal antibodies or ligands that are targeted by APCs. The aim of this review is to discuss existing strategies of selective delivery of antigens to APCs for effective vaccine development in poultry.
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Affiliation(s)
- Angita Shrestha
- The Pirbright Institute, Ash Road, Pirbright, Woking GU24 0NF, Surrey, UK.
- Department of Zoology, University of Oxford, Oxford OX1 2JD, UK.
| | - Jean-Remy Sadeyen
- The Pirbright Institute, Ash Road, Pirbright, Woking GU24 0NF, Surrey, UK.
| | - Munir Iqbal
- The Pirbright Institute, Ash Road, Pirbright, Woking GU24 0NF, Surrey, UK.
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