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Mahmoud ME, Farooq M, Isham IM, Ali A, Hassan MSH, Herath-Mudiyanselage H, Ranaweera HA, Najimudeen SM, Abdul-Careem MF. Cyclooxygenase-2/prostaglandin E2 pathway regulates infectious bronchitis virus replication in avian macrophages. J Gen Virol 2024; 105. [PMID: 38189432 DOI: 10.1099/jgv.0.001949] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2024] Open
Abstract
Infectious bronchitis virus (IBV) is a significant respiratory pathogen that affects chickens worldwide. As an avian coronavirus, IBV leads to productive infection in chicken macrophages. However, the effects of IBV infection in macrophages on cyclooxygenase-2 (COX-2) expression are still to be elucidated. Therefore, we investigated the role of IBV infection on the production of COX-2, an enzyme involved in the synthesis of prostaglandin E2 (PGE2) in chicken macrophages. The chicken macrophage cells were infected with two IBV strains, and the cells and culture supernatants were harvested at predetermined time points to measure intracellular and extracellular IBV infection. IBV infection was quantified as has been the COX-2 and PGE2 productions. We found that IBV infection enhances COX-2 production at both mRNA and protein levels in chicken macrophages. When a selective COX-2 antagonist was used to reduce the COX-2 expression in macrophages, we observed that IBV replication decreased. When IBV-infected macrophages were treated with PGE2 receptor (EP2 and EP4) inhibitors, IBV replication was reduced. Upon utilizing a selective COX-2 antagonist to diminish PGE2 expression in macrophages, a discernible decrease in IBV replication was observed. Treatment of IBV-infected macrophages with a PGE2 receptor (EP2) inhibitor resulted in a reduction in IBV replication, whereas the introduction of exogenous PGE2 heightened viral replication. Additionally, pretreatment with a Janus-kinase two antagonist attenuated the inhibitory effect of recombinant chicken interferon (IFN)-γ on viral replication. The evaluation of immune mediators, such as inducible nitric oxide (NO) synthase (iNOS), NO, and interleukin (IL)-6, revealed enhanced expression following IBV infection of macrophages. In response to the inhibition of COX-2 and PGE2 receptors, we observed a reduction in the expressions of iNOS and IL-6 in macrophages, correlating with reduced IBV infection. Overall, IBV infection increased COX-2 and PGE2 production in addition to iNOS, NO, and IL-6 expression in chicken macrophages in a time-dependent manner. Inhibition of the COX-2/PGE2 pathway may lead to increased macrophage defence mechanisms against IBV infection, resulting in a reduction in viral replication and iNOS and IL-6 expressions. Understanding the molecular mechanisms underlying these processes may shed light on potential antiviral targets for controlling IBV infection.
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Affiliation(s)
- Motamed Elsayed Mahmoud
- Faculty of Veterinary Medicine, University of Calgary, 3330 Hospital Drive NW, Calgary, AB, T2N 4N1, Canada
- Department of Animal Husbandry, Faculty of Veterinary Medicine, Sohag University, Sohag 84524, Egypt
| | - Muhammad Farooq
- Faculty of Veterinary Medicine, University of Calgary, 3330 Hospital Drive NW, Calgary, AB, T2N 4N1, Canada
| | - Ishara M Isham
- Faculty of Veterinary Medicine, University of Calgary, 3330 Hospital Drive NW, Calgary, AB, T2N 4N1, Canada
| | - Ahmed Ali
- Faculty of Veterinary Medicine, University of Calgary, 3330 Hospital Drive NW, Calgary, AB, T2N 4N1, Canada
- Department of Pathology, Faculty of Veterinary Medicine, Beni-Suef University, Beni Suef, 62521, Egypt
| | - Mohamed S H Hassan
- Faculty of Veterinary Medicine, University of Calgary, 3330 Hospital Drive NW, Calgary, AB, T2N 4N1, Canada
- Department of Avian and Rabbit Medicine, Faculty of Veterinary Medicine, Assiut University, Assiut 71515, Egypt
| | | | - Hiruni A Ranaweera
- Faculty of Veterinary Medicine, University of Calgary, 3330 Hospital Drive NW, Calgary, AB, T2N 4N1, Canada
| | - Shahnas M Najimudeen
- Faculty of Veterinary Medicine, University of Calgary, 3330 Hospital Drive NW, Calgary, AB, T2N 4N1, Canada
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Hassan MSH, Abd-Elsalam RM, Ratcliff N, Herath-Mudiyanselage H, Abdul-Careem MF. The impact of the experimental route of challenge on the host responses and pathogenesis of the Canadian Delmarva (DMV/1639) infectious bronchitis virus infection in laying chickens. Vet Immunol Immunopathol 2023; 261:110623. [PMID: 37364440 DOI: 10.1016/j.vetimm.2023.110623] [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: 05/08/2023] [Revised: 06/19/2023] [Accepted: 06/20/2023] [Indexed: 06/28/2023]
Abstract
Infectious bronchitis virus (IBV) infection can be associated with respiratory, renal, and/or reproductive diseases in chickens. Under natural conditions, conjunctiva, mucosa of upper respiratory tract, and cloaca are the main routes of IBV entry. Experimentally, the study of IBV infection involved various routes of inoculation. This study investigated the impact of adding the trachea as a potential route of viral entry to the oculo-nasal infection on the host responses, pathogenicity, and tissue tropism of the Canadian IBV Delmarva (DMV/1639) strain in laying chickens. Specific-pathogen-free laying chickens were divided into three experimental groups: control group (Con group), oculo-nasal challenged group (ON group), and oculo-nasal/intratracheal challenged group (ON/IT group); all groups were observed for 12 days post-infection (dpi). The clinical signs and reduction in egg production in the ON/IT group started slightly earlier compared to the ON group. At 12 dpi, the gross lesions in the ON/IT group were confined to the ovary, while the ON group showed regressed ovary and atrophied oviduct. Only the ON group showed significantly higher microscopic lesion scores in the lung, kidney, magnum, and uterus compared to the control group at 12 dpi. The oviduct tissues of the ON group showed a significant increase in B cells infiltration compared to ON/IT and control groups. The viral shedding (detected by quantitative reverse transcription polymerase chain reaction (qRT-PCR)), tissue tropism (detected either by qRT-PCR or immunohistochemistry (IHC)), T/natural killer cells infiltration in reproductive tract (detected by IHC), and antibody-mediated immune responses (measured by enzyme-linked immunosorbent assay) showed similar patterns in the ON and ON/IT groups.
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Affiliation(s)
- Mohamed S H Hassan
- Faculty of Veterinary Medicine, University of Calgary, 3330 Hospital Drive NW, Calgary, AB T2N 4N1, Canada; Department of Poultry Diseases, Faculty of Veterinary Medicine, Assiut University, Assiut, 71515, Egypt
| | - Reham M Abd-Elsalam
- Faculty of Veterinary Medicine, University of Calgary, 3330 Hospital Drive NW, Calgary, AB T2N 4N1, Canada; Department of Pathology, Faculty of Veterinary Medicine, Cairo University, Giza 12211, Egypt
| | - Natalya Ratcliff
- Faculty of Veterinary Medicine, University of Calgary, 3330 Hospital Drive NW, Calgary, AB T2N 4N1, Canada
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