1
|
Kumar R, Bera BC, Anand T, Pavulraj S, Kurian Mathew M, Gupta RP, Tripathi BN, Virmani N. Evaluation of immunogenicity and protective efficacy of bacteriophage conjugated haemagglutinin based subunit vaccine against equine influenza virus in a murine model. Vet Res Commun 2024:10.1007/s11259-024-10356-6. [PMID: 38528300 DOI: 10.1007/s11259-024-10356-6] [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: 12/22/2023] [Accepted: 03/13/2024] [Indexed: 03/27/2024]
Abstract
Equine influenza (EI) is a highly contagious acute respiratory disease of equines caused by the H3N8 subtype of Influenza A virus i.e. equine influenza virus (EIV). Vaccination is an important and effective tool for the control of EI in equines. Most of the commercial influenza vaccines are produced in embryonated hen's eggs which has several inherent disadvantages. Hence, subunit vaccine based on recombinant haemagglutinin (HA) antigen, being the most important envelope glycoprotein has been extensively exploited for generating protective immune responses, against influenza A and B viruses. We hypothesized that novel vaccine formulation using baculovirus expressed recombinant HA1 (rHA1) protein coupled with bacteriophage will generate strong protective immune response against EIV. In the present study, the recombinant HA1 protein was produced in insect cells using recombinant baculovirus having cloned HA gene of EIV (Florida clade 2 sublineage) and the purified rHA1 was chemically coupled with bacteriophage using a crosslinker to produce rHA1-phage vaccine candidate. The protective efficacy of vaccine preparations of rHA1-phage conjugate and only rHA1 proteins were evaluated in mouse model through assessing serology, cytokine profiling, clinical signs, gross and histopathological changes, immunohistochemistry, and virus quantification. Immunization of vaccine preparations have stimulated moderate antibody response (ELISA titres-5760 ± 640 and 11,520 ± 1280 for rHA1 and rHA1-phage, respectively at 42 dpi) and elicited strong interferon (IFN)-γ expression levels after three immunizations of vaccine candidates. The immunized BALB/c mice were protected against challenge with wild EIV and resulted in reduced clinical signs and body weight loss, reduced pathological changes, decreased EIV antigen distribution, and restricted EIV replication in lungs and nasopharynx. In conclusion, the immune responses with moderate antibody titer and significantly higher cytokine responses generated by the rHA1-phage vaccine preparation without any adjuvant could be a novel vaccine candidate for quick vaccine preparation through further trials of vaccine in the natural host.
Collapse
Affiliation(s)
- Ramesh Kumar
- Department of Veterinary Public Health and Epidemiology, LUVAS, Hisar, Haryana, 125004, India
| | | | - Taruna Anand
- ICAR- National Research Centre on Equines, Hisar, Haryana, 125 001, India
| | - Selvaraj Pavulraj
- Louisiana State University School of Veterinary Medicine, Skip Bertman Dr, Baton Rouge, LA, 70803, USA
| | - Manu Kurian Mathew
- ICAR- National Research Centre on Equines, Hisar, Haryana, 125 001, India
| | - R P Gupta
- Department of Veterinary Pathology, LUVAS, Hisar, Haryana, 125004, India
| | | | - Nitin Virmani
- ICAR- National Research Centre on Equines, Hisar, Haryana, 125 001, India.
| |
Collapse
|
2
|
Lee DH, Lee EB, Seo JP, Ko EJ. Evaluation of concurrent vaccinations with recombinant canarypox equine influenza virus and inactivated equine herpesvirus vaccines. J Anim Sci Technol 2022; 64:588-598. [PMID: 35709134 PMCID: PMC9184697 DOI: 10.5187/jast.2022.e30] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/18/2022] [Revised: 04/05/2022] [Accepted: 04/13/2022] [Indexed: 11/20/2022]
Abstract
Despite vaccination, equine influenza virus (EIV) and equine herpesvirus (EHV)
infections still cause highly contagious respiratory diseases in horses.
Recently, concurrent vaccination with EIV and EHV was suggested as a new
approach; however, there have been no reports of concurrent vaccination with
recombinant canarypox EIV and inactivated EHV vaccines. In this study, we aimed
to compare the EIV-specific immune responses induced by concurrent
administrations of a recombinant canarypox EIV vaccine and an inactivated
bivalent EHV vaccine with those induced by a single recombinant canarypox EIV
vaccine in experimental horse and mouse models. Serum and peripheral blood
mononuclear cells (PBMCs) were collected from immunized animals after
vaccination. EIV-specific serum antibody levels, serum hemagglutinin inhibition
(HI) titers, and interferon-gamma (IFN-γ) levels were measured by
enzyme-linked immunosorbent assay, HI assay, and quantitative polymerase chain
reaction, respectively. Concurrent EIV and EHV vaccine administration
significantly increased IFN-γ production, without compromising humoral
responses. Our data demonstrate that concurrent vaccination with EIV and EHV
vaccines can enhance EIV-specific cellular responses in horses.
Collapse
Affiliation(s)
- Dong-Ha Lee
- College of Veterinary Medicine and
Veterinary Medical Research Institute, Jeju National
University, Jeju 63243, Korea
| | - Eun-bee Lee
- Department of Veterinary Medicine, College
of Veterinary Medicine, Jeju National University, Jeju 63243,
Korea
| | - Jong-pil Seo
- Department of Veterinary Medicine, College
of Veterinary Medicine, Jeju National University, Jeju 63243,
Korea
| | - Eun-Ju Ko
- College of Veterinary Medicine and
Veterinary Medical Research Institute, Jeju National
University, Jeju 63243, Korea
- Corresponding author: Eun-Ju Ko, College of
Veterinary Medicine and Veterinary Medical Research Institute, Jeju National
University, Jeju 63243, Korea. Tel: +82-64-754-3366, E-mail:
| |
Collapse
|