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Wang Z, He M, He H, Kilby K, Antueno RD, Castle E, McMullen N, Qian Z, Zeev-Ben-Mordehai T, Duncan R, Pan C. Nonenveloped Avian Reoviruses Released with Small Extracellular Vesicles Are Highly Infectious. Viruses 2023; 15:1610. [PMID: 37515296 PMCID: PMC10384003 DOI: 10.3390/v15071610] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2023] [Revised: 07/20/2023] [Accepted: 07/21/2023] [Indexed: 07/30/2023] Open
Abstract
Vesicle-encapsulated nonenveloped viruses are a recently recognized alternate form of nonenveloped viruses that can avoid immune detection and potentially increase systemic transmission. Avian orthoreoviruses (ARVs) are the leading cause of various disease conditions among birds and poultry. However, whether ARVs use cellular vesicle trafficking routes for egress and cell-to-cell transmission is still poorly understood. We demonstrated that fusogenic ARV-infected quail cells generated small (~100 nm diameter) extracellular vesicles (EVs) that contained electron-dense material when observed by transmission electron microscope. Cryo-EM tomography indicated that these vesicles did not contain ARV virions or core particles, but the EV fractions of OptiPrep gradients did contain a small percent of the ARV virions released from cells. Western blotting of detergent-treated EVs revealed that soluble virus proteins and the fusogenic p10 FAST protein were contained within the EVs. Notably, virus particles mixed with the EVs were up to 50 times more infectious than virions alone. These results suggest that EVs and perhaps fusogenic FAST-EVs could contribute to ARV virulence.
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Affiliation(s)
- Zuopei Wang
- Laboratory of Molecular Virology and Immunology, Technology Innovation Center, Haid Research Institute, Guangdong Haid Group Co., Ltd., Panyu, Guangzhou 511400, China
| | - Menghan He
- Laboratory of Molecular Virology and Immunology, Technology Innovation Center, Haid Research Institute, Guangdong Haid Group Co., Ltd., Panyu, Guangzhou 511400, China
| | - Han He
- Department of Microbiology & Immunology, Dalhousie University, Halifax, NS B3H 4R2, Canada
| | - Kyle Kilby
- Department of Microbiology & Immunology, Dalhousie University, Halifax, NS B3H 4R2, Canada
| | - Roberto de Antueno
- Department of Microbiology & Immunology, Dalhousie University, Halifax, NS B3H 4R2, Canada
| | - Elizabeth Castle
- Department of Microbiology & Immunology, Dalhousie University, Halifax, NS B3H 4R2, Canada
| | - Nichole McMullen
- Department of Microbiology & Immunology, Dalhousie University, Halifax, NS B3H 4R2, Canada
| | - Zhuoyu Qian
- Department of Biochemical Engineering, University College London, London WC1E 6BT, UK
| | | | - Roy Duncan
- Department of Microbiology & Immunology, Dalhousie University, Halifax, NS B3H 4R2, Canada
- Department of Biochemistry & Molecular Biology, Dalhousie University, Halifax, NS B3H 4R2, Canada
| | - Chungen Pan
- Laboratory of Molecular Virology and Immunology, Technology Innovation Center, Haid Research Institute, Guangdong Haid Group Co., Ltd., Panyu, Guangzhou 511400, China
- Department of Microbiology & Immunology, Dalhousie University, Halifax, NS B3H 4R2, Canada
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