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Zhao Y, Zhou L, Zheng H, Gao L, Cao H, Li X, Zheng SJ, Wang Y. Gga-miR-200a-3p suppresses avian reovirus-induced apoptosis and viral replication via targeting GRB2. Vet Microbiol 2024; 295:110149. [PMID: 38909417 DOI: 10.1016/j.vetmic.2024.110149] [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] [Received: 03/21/2024] [Revised: 06/03/2024] [Accepted: 06/05/2024] [Indexed: 06/25/2024]
Abstract
Avian reovirus (ARV) is a significant pathogen that causes various clinical diseases in chickens, including viral arthritis, chronic respiratory diseases, retarded growth, and malabsorption syndrome. These conditions result in substantial economic losses for the global poultry industry. MicroRNAs (miRNAs), a type of small noncoding RNAs that regulate gene expression post transcriptionally by silencing or degrading their RNA targets, play crucial roles in response to pathogenic infections. In this study, transfection of DF-1 cells with gga-miR-200a-3p, an upregulated miRNA observed in ARV-infected cells, significantly suppressed ARV-induced apoptosis by directly targeting GRB2 and impeded ARV replication. Conversely, knockdown of endogenous gga-miR-200a-3p in DF-1 cells using a specific miRNA inhibitor enhanced ARV-induced apoptosis and promoted GRB2 expression, thereby facilitating viral growth within cells. Consistently, inhibition of GRB2 activity through siRNA-mediated knockdown reduced viral titers. Therefore, gga-miR-200a-3p plays a vital antiviral role in the host response to ARV infection by suppressing apoptosis via direct targeting of GRB2 protein. This information enhances our understanding of the mechanisms by which host cells combat against ARV infection through self-encoded small RNA molecules and expands our knowledge regarding the involvement of microRNAs in the host response to pathogenic infections.
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Affiliation(s)
- Yimeng Zhao
- National Key Laboratory of Veterinary Public Health Security, China; Animal Epidemiology of the Ministry of Agriculture, China; College of Veterinary Medicine, China Agricultural University, Beijing 100193, China
| | - Linyi Zhou
- National Key Laboratory of Veterinary Public Health Security, China; Animal Epidemiology of the Ministry of Agriculture, China; College of Veterinary Medicine, China Agricultural University, Beijing 100193, China
| | - Hao Zheng
- National Key Laboratory of Veterinary Public Health Security, China; Animal Epidemiology of the Ministry of Agriculture, China; College of Veterinary Medicine, China Agricultural University, Beijing 100193, China
| | - Li Gao
- National Key Laboratory of Veterinary Public Health Security, China; Animal Epidemiology of the Ministry of Agriculture, China; College of Veterinary Medicine, China Agricultural University, Beijing 100193, China
| | - Hong Cao
- National Key Laboratory of Veterinary Public Health Security, China; Animal Epidemiology of the Ministry of Agriculture, China; College of Veterinary Medicine, China Agricultural University, Beijing 100193, China
| | - Xiaoqi Li
- National Key Laboratory of Veterinary Public Health Security, China; Animal Epidemiology of the Ministry of Agriculture, China; College of Veterinary Medicine, China Agricultural University, Beijing 100193, China
| | - Shijun J Zheng
- National Key Laboratory of Veterinary Public Health Security, China; Animal Epidemiology of the Ministry of Agriculture, China; College of Veterinary Medicine, China Agricultural University, Beijing 100193, China
| | - Yongqiang Wang
- National Key Laboratory of Veterinary Public Health Security, China; Animal Epidemiology of the Ministry of Agriculture, China; College of Veterinary Medicine, China Agricultural University, Beijing 100193, China.
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Mao P, Feng Z, Liu Y, Zhang K, Zhao G, Lei Z, Di T, Zhang H. The Role of Ubiquitination in Osteosarcoma Development and Therapies. Biomolecules 2024; 14:791. [PMID: 39062505 DOI: 10.3390/biom14070791] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2024] [Revised: 06/20/2024] [Accepted: 06/28/2024] [Indexed: 07/28/2024] Open
Abstract
The ubiquitin-proteasome system (UPS) maintains intracellular protein homeostasis and cellular function by regulating various biological processes. Ubiquitination, a common post-translational modification, plays a crucial role in the regulation of protein degradation, signal transduction, and other physiological and pathological processes, and is involved in the pathogenesis of various cancers, including osteosarcoma. Osteosarcoma, the most common primary malignant bone tumor, is characterized by high metastatic potential and poor prognosis. It is a refractory bone disease, and the main treatment modalities are surgery combined with chemotherapy. Increasing evidence suggests a close association between UPS abnormalities and the progression of osteosarcoma. Due to the complexity and pleiotropy of the ubiquitination system, each step in the ubiquitination process can be targeted by drugs. In recent years, research and development of inhibitors targeting the ubiquitin system have increased gradually, showing great potential for clinical application. This article reviews the role of the ubiquitination system in the development and treatment of osteosarcoma, as well as research progress, with the hope of improving the therapeutic effects and prognosis of osteosarcoma patients by targeting effective molecules in the ubiquitination system.
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Affiliation(s)
- Peng Mao
- Department of Orthopedics, Lanzhou University Second Hospital, Second Clinical School, Lanzhou University, Lanzhou 730030, China
- Key Laboratory of Orthopaedics of Gansu Province, Lanzhou University, Lanzhou 730030, China
| | - Zuxi Feng
- Department of Hematology, Lanzhou University Second Hospital, Lanzhou 730030, China
| | - Yong Liu
- Department of Orthopedics, Lanzhou University Second Hospital, Second Clinical School, Lanzhou University, Lanzhou 730030, China
- Key Laboratory of Orthopaedics of Gansu Province, Lanzhou University, Lanzhou 730030, China
| | - Kai Zhang
- Department of Orthopedics, Lanzhou University Second Hospital, Second Clinical School, Lanzhou University, Lanzhou 730030, China
- Key Laboratory of Orthopaedics of Gansu Province, Lanzhou University, Lanzhou 730030, China
| | - Guanghai Zhao
- Department of Orthopedics, Lanzhou University Second Hospital, Second Clinical School, Lanzhou University, Lanzhou 730030, China
- Key Laboratory of Orthopaedics of Gansu Province, Lanzhou University, Lanzhou 730030, China
| | - Zeyuan Lei
- Department of Orthopedics, Lanzhou University Second Hospital, Second Clinical School, Lanzhou University, Lanzhou 730030, China
- Key Laboratory of Orthopaedics of Gansu Province, Lanzhou University, Lanzhou 730030, China
| | - Tianning Di
- Department of Orthopedics, Lanzhou University Second Hospital, Second Clinical School, Lanzhou University, Lanzhou 730030, China
| | - Haihong Zhang
- Department of Orthopedics, Lanzhou University Second Hospital, Second Clinical School, Lanzhou University, Lanzhou 730030, China
- Key Laboratory of Orthopaedics of Gansu Province, Lanzhou University, Lanzhou 730030, China
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Abstract
Avian reoviruses (ARVs) have a significant economic impact on the poultry industry, affecting commercial and backyard flocks. Spread feco-orally, or vertically, many do not cause morbidity, but pathogenic strains can contribute to several diseases, including tenosynovitis/arthritis, which is clinically the most significant. The last decade has seen a surge in cases in the US, and due to ongoing evolution, seven genotypic clusters have now been identified. Control efforts include strict biosecurity and vaccination with commercial and autogenous vaccines. Research priorities include improving understanding of pathogenesis and developing new vaccines guided by ongoing molecular and serologic surveillance.
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Affiliation(s)
- Sofia Egana-Labrin
- Department of Animal and Avian Sciences, University of Maryland, College Park, MD, 20742, USA
| | - Andrew J Broadbent
- Department of Animal and Avian Sciences, University of Maryland, College Park, MD, 20742, USA
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Dai Y, Li Y, Hu X, Jiang N, Liu W, Meng Y, Zhou Y, Xu C, Xue M, Fan Y. Nonstructural protein NS17 of grass carp reovirus Honghu strain promotes virus infection by mediating cell-cell fusion and apoptosis. Virus Res 2023; 334:199150. [PMID: 37302658 PMCID: PMC10410512 DOI: 10.1016/j.virusres.2023.199150] [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] [Received: 04/21/2023] [Revised: 06/07/2023] [Accepted: 06/08/2023] [Indexed: 06/13/2023]
Abstract
Fusion-associated small transmembrane (FAST) proteins can promote cell fusion, alter membrane permeability and trigger apoptosis to promote virus proliferation in orthoreoviruses. However, it is unknown whether FAST proteins perform these functions in aquareoviruses (AqRVs). Non-structural protein 17 (NS17) carried by grass carp reovirus Honghu strain (GCRV-HH196) belongs to the FAST protein family, and we preliminarily explored its relevance to virus infection. NS17 has similar domains to FAST protein NS16 of GCRV-873, comprising a transmembrane domain, a polybasic cluster, a hydrophobic patch and a polyproline motif. It was observed in the cytoplasm and the cell membrane. Overexpression of NS17 enhanced the efficiency of cell-cell fusion induced by GCRV-HH196 and promoted virus replication. Overexpression of NS17 also led to DNA fragmentation and reactive oxygen species (ROS) accumulation, and it triggered apoptosis. The findings illuminate the functions of NS17 in GCRV infection, and provide a reference for the development of novel antiviral strategies.
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Affiliation(s)
- Yanlin Dai
- Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan 430223, China; National Demonstration Center for Experimental Fisheries Science Education, Shanghai Ocean University, Shanghai 201306, China
| | - Yiqun Li
- Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan 430223, China.
| | - Xi Hu
- Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan 430223, China; National Demonstration Center for Experimental Fisheries Science Education, Shanghai Ocean University, Shanghai 201306, China
| | - Nan Jiang
- Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan 430223, China
| | - Wenzhi Liu
- Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan 430223, China
| | - Yan Meng
- Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan 430223, China
| | - Yong Zhou
- Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan 430223, China
| | - Chen Xu
- Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan 430223, China
| | - Mingyang Xue
- Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan 430223, China
| | - Yuding Fan
- Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan 430223, China; National Demonstration Center for Experimental Fisheries Science Education, Shanghai Ocean University, Shanghai 201306, China.
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Gga-miR-30c-5p Suppresses Avian Reovirus (ARV) Replication by Inhibition of ARV-Induced Autophagy via Targeting ATG5. J Virol 2022; 96:e0075922. [PMID: 35867570 PMCID: PMC9327706 DOI: 10.1128/jvi.00759-22] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Avian reovirus (ARV) is an important poultry pathogen causing viral arthritis, chronic respiratory diseases, and retarded growth, leading to considerable economic losses to the poultry industry across the globe. Elucidation of the pathogenesis of ARV infection is crucial to guiding the development of novel vaccines or drugs for the effective control of these diseases.
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Gga-miR-29a-3p suppresses avian reovirus-induced apoptosis and viral replication via targeting Caspase-3. Vet Microbiol 2021; 264:109294. [PMID: 34847454 DOI: 10.1016/j.vetmic.2021.109294] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2021] [Revised: 09/09/2021] [Accepted: 09/16/2021] [Indexed: 12/25/2022]
Abstract
Avian reovirus (ARV) is an important pathogen causing multiple types of clinical diseases in chickens, including viral arthritis, chronic respiratory diseases, retarded growth, and malabsorption syndrome, leading to considerable economic losses to the poultry industry across the globe. MicroRNAs (miRNAs) are small noncoding RNAs that regulate gene expression post transcriptionally by silencing or degrading their targets, thus playing important roles in the host response to pathogenic infection. However, the role of miRNAs in host response to ARV infection is still not clear. Here, we show that infection of DF-1 cells (a chicken fibroblast cell line) with ARV markedly altered the expressions of 583 chicken miRNAs(gga-miR), and that transfection of DF-1 cells with gga-miR-29a-3p, an upregulated miRNA in ARV-infected cells, significantly suppressed ARV-induced apoptosis via directly targeting Caspase-3, retarding ARV growth in cells. In contrast, knockdown of endogenous gga-miR-29a-3p in DF-1 cells by specific miRNA inhibitor enhanced ARV-induced apoptosis and increased the content and activity of caspase-3, facilitating viral growth in cells. Consistently, inhibition of Caspase-3 activity by inhibitors decreased viral titers in cell cultures. Thus, gga-miR-29a-3p plays an important antiviral role in host response to ARV infection by suppression of apoptosis via targeting Caspase-3. This information will further our understandings of how host cells combat against ARV infection by self-encoded small RNA and increase our knowledge of the role of microRNAs in host response to pathogenic infection.
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Boodhoo N, Kamble N, Behboudi S. De Novo Cholesterol Biosynthesis and Its Trafficking in LAMP-1-Positive Vesicles Are Involved in Replication and Spread of Marek's Disease Virus. J Virol 2020; 94:e01001-20. [PMID: 32999035 PMCID: PMC7925193 DOI: 10.1128/jvi.01001-20] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Accepted: 09/25/2020] [Indexed: 01/08/2023] Open
Abstract
Marek's disease virus (MDV) transforms CD4+ T cells and causes a deadly neoplastic disease that is associated with metabolic dysregulation leading to atherosclerosis in chickens. While MDV-infected chickens have normal serum concentrations of cholesterol, their aortic tissues were found to have elevated concentrations of free and esterified cholesterol. Here, we demonstrate that infection of chicken embryonated fibroblasts (CEFs) with highly pathogenic MDV-RB1B increases the cellular cholesterol content and upregulates the genes involved in cholesterol synthesis and cellular cholesterol homeostasis using comprehensive two-dimensional gas chromatography-mass spectrometry and real-time PCR (RT-PCR), respectively. Using small pharmacological inhibitors and gene silencing, we established an association between MDV-RB1B replication and mevalonic acid, sterol, and cholesterol biosynthesis and trafficking/redistribution. We propose that MDV trafficking is mediated by lysosome-associated membrane protein 1 (LAMP-1)-positive vesicles based on short hairpin RNA (shRNA) gene silencing and the colocalization of LAMP-1, glycoprotein B (gB) of MDV, and cholesterol (filipin III) fluorescence signal intensity peaks. In conclusion, our results demonstrate that MDV hijacks cellular cholesterol biosynthesis and cholesterol trafficking to facilitate cell-to-cell spread in a LAMP-1-dependent mechanism.IMPORTANCE MDV disrupts lipid metabolism and causes atherosclerosis in MDV-infected chickens; however, the role of cholesterol metabolism in the replication and spread of MDV is unknown. MDV-infected cells do not produce infectious cell-free virus in vitro, raising the question about the mechanism involved in the cell-to-cell spread of MDV. In this report, we provide evidence that MDV replication depends on de novo cholesterol biosynthesis and uptake. Interruption of cholesterol trafficking within multivesicular bodies (MVBs) by chemical inhibitors or gene silencing reduced MDV titers and cell-to-cell spread. Finally, we demonstrated that MDV gB colocalizes with cholesterol and LAMP-1, suggesting that viral protein trafficking is mediated by LAMP-1-positive vesicles in association with cholesterol. These results provide new insights into the cholesterol dependence of MDV replication.
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Affiliation(s)
- Nitish Boodhoo
- The Pirbright Institute, Pirbright, Woking, United Kingdom
| | - Nitin Kamble
- The Pirbright Institute, Pirbright, Woking, United Kingdom
| | - Shahriar Behboudi
- The Pirbright Institute, Pirbright, Woking, United Kingdom
- Faculty of Health and Medical Sciences, School of Veterinary Medicine, University of Surrey, Guildford, Surrey, United Kingdom
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8
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Chatukuta P, Rey MEC. A cassava protoplast system for screening genes associated with the response to South African cassava mosaic virus. Virol J 2020; 17:184. [PMID: 33228712 PMCID: PMC7685591 DOI: 10.1186/s12985-020-01453-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2020] [Accepted: 11/09/2020] [Indexed: 01/08/2023] Open
Abstract
Background The study of transient gene expression in cassava plants during virus infection using existing protocols is laborious and may take approximately fifteen weeks due to cassava’s recalcitrance to transformation. The combination of a protoplast system with CRISPR-mediated gene editing promises to shorten the turnaround time from plant tissue culture to high-throughput gene expression screening for candidate genes. Here, we detail a protocol for screening genes associated with the response to South African cassava mosaic virus (SACMV) in cassava protoplasts, with reference to the ubiquitin E3 ligase gene, MeE3L.
Methods Cassava protoplasts of model, and SACMV-susceptible and -tolerant genotypes, were transformed with SACMV infectious clones and/or a CRISPR-editing construct targeting the MeE3L using PEG4000-mediated transfection. DNA and RNA were extracted from transformed protoplasts at 24 h post-transfection. Relative SACMV DNA accumulation was determined via qPCR using DpnI-digested total DNA, MeE3L relative expression was determined via reverse transcriptase qPCR, and results were analysed using one-way ANOVA, Tukey’s HSD test and the 2−ΔΔCTstatistical method. The MeE3L exonic region was sequenced on the ABI 3500XL Genetic Analyzer platform; and sequences were analysed for mutations using MAFTT and MEGA-X software. Construction of a phylogenetic tree was done using the Maximum Likelihood method and Jones-Taylor-Thornton (JTT) matrix-based model. Results The differential expression of unedited and mutant MeE3L during SACMV infection of model, susceptible and tolerant cassava protoplasts was determined within 7 weeks after commencement of tissue culture. The study also revealed that SACMV DNA accumulation in cassava protoplasts is genotype-dependent and induces multiple mutations in the tolerant landrace MeE3L homolog. Notably, the susceptible cassava landrace encodes a RINGless MeE3Lwhich is silenced by SACMV-induced mutations. SACMV also induces mutations which silence the MeE3L RING domain in protoplasts from and tolerant cassava landraces. Conclusions This protocol presented here halves the turnaround time for high-throughput screening of genes associated with the host response to SACMV. It provides evidence that a cassava E3 ligase is associated with the response to SACMV and forms a basis for validation of these findings by in planta functional and interaction studies.
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Affiliation(s)
- Patience Chatukuta
- School of Molecular and Cell Biology, University of the Witwatersrand, Johannesburg, South Africa
| | - Marie Emma Christine Rey
- School of Molecular and Cell Biology, University of the Witwatersrand, Johannesburg, South Africa.
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Porcine RING Finger Protein 114 Inhibits Classical Swine Fever Virus Replication via K27-Linked Polyubiquitination of Viral NS4B. J Virol 2019; 93:JVI.01248-19. [PMID: 31413123 PMCID: PMC6803260 DOI: 10.1128/jvi.01248-19] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2019] [Accepted: 08/04/2019] [Indexed: 12/15/2022] Open
Abstract
Porcine RING finger protein 114 (pRNF114) is a member of the RING domain E3 ligases. In this study, it was shown that pRNF114 is a potential anti-CSFV factor and the anti-CSFV effect of pRNF114 depends on its E3 ligase activity. Notably, pRNF114 targets and catalyzes the K27-linked polyubiquitination of the NS4B protein and then promotes proteasome-dependent degradation of NS4B, inhibiting the replication of CSFV. To our knowledge, pRNF114 is the first E3 ligase to be identified as being involved in anti-CSFV activity, and targeting NS4B could be a crucial route for antiviral development. In the host, many RING domain E3 ligases have been reported to inhibit viral replication through various mechanisms. In a previous screen, we found that porcine RING finger protein 114 (pRNF114), a RING domain E3 ubiquitin ligase, inhibits classical swine fever virus (CSFV) replication. This study aimed to clarify the underlying antiviral mechanism of pRNF114 against CSFV. Upon CSFV infection, pRNF114 mRNA was upregulated both in vitro and in vivo. CSFV replication was significantly suppressed in PK-pRNF114 cells stably expressing pRNF114 by the lentivirus-delivered system, whereas CSFV growth was enhanced in PK-15 cells with RNF114 knockout by the CRISPR/Cas9 system. The RING domain of pRNF114, which has E3 ubiquitin ligase activity, is crucial for its antiviral activity. Mechanistically, pRNF114 interacted with the CSFV NS4B protein through their C-terminal domains, which led to the K27-linked polyubiquitination and degradation of NS4B through a proteasome-dependent pathway. Collectively, these findings indicate that pRNF114 as a critical regulator of CSFV replication and uncover a mechanism by which pRNF114 employs its E3 ubiquitin ligase activity to inhibit CSFV replication. IMPORTANCE Porcine RING finger protein 114 (pRNF114) is a member of the RING domain E3 ligases. In this study, it was shown that pRNF114 is a potential anti-CSFV factor and the anti-CSFV effect of pRNF114 depends on its E3 ligase activity. Notably, pRNF114 targets and catalyzes the K27-linked polyubiquitination of the NS4B protein and then promotes proteasome-dependent degradation of NS4B, inhibiting the replication of CSFV. To our knowledge, pRNF114 is the first E3 ligase to be identified as being involved in anti-CSFV activity, and targeting NS4B could be a crucial route for antiviral development.
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Liu J, Yu C, Gui JF, Pang DW, Zhang QY. Real-Time Dissecting the Entry and Intracellular Dynamics of Single Reovirus Particle. Front Microbiol 2018; 9:2797. [PMID: 30515143 PMCID: PMC6256031 DOI: 10.3389/fmicb.2018.02797] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2018] [Accepted: 10/31/2018] [Indexed: 12/17/2022] Open
Abstract
Reoviruses are non-enveloped viruses with wide host range, can cause serious infections in animals, plants and microorganism, e.g., aquareovirus, which is capable of causing serious haemorrhagic in aquatic animals. To date, the entry process of aquareovirus infection remains obscure. Real-time single-virus tracking are effective tools for exploring the details in viral infection process, which are crucial for understanding the pathogenic mechanism. Here, we used quantum dots-based single particle tracking technology combined with biochemical assays and ultrastructural observation to reveal unobservable infection steps and map dynamic interactions between a reovirus, Scophthalmus maximus reovirus (SMReV), and its host cell in real time. The results showed that the single membrane-bound reovirus particle can enter into the cell within several seconds through nascent clathrin-caoted pits, and most of the particles could internalize into cytoplasm within 30 min post-infection. The specific inhibitors analysis also showed that entry of SMREV depended on clathrin-mediated endocytosis rather than cavolin-mediated endocytosis. The motion analysis of internalized single particle indicated that the reovirus initially experienced slow and directed motion in the actin-enriched cell periphery, while it underwent relatively faster and directed movement toward the cell interior, suggesting that transport of SMReV was dependent on the cytoskeleton. Further, dual-labeling of virus and cytoskeleton and inhibitor analysis both demonstrated that transport of internalized SMReV was firstly dependent on actin filaments at the cell periphery, and then on microtubules toward the cell interior. Then visualization of SMReV trafficking in the endosomes revealed that the internalized reovirus particles were sorted from early endosomes to late endosomes, then part of them were delivered to lysosome. This study for the first time revealed the entry pathway, intracellular dynamic and the infection fate of fish reovirus in host cell in real time and in situ, which provided new insights into the infection mechanism of non-enveloped viruses.
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Affiliation(s)
- Jia Liu
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, China
| | - Cong Yu
- Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), State Key Laboratory of Virology, College of Chemistry and Molecular Sciences, Institute of Advanced Studies, Wuhan University, Wuhan, China
| | - Jian-Fang Gui
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, China
| | - Dai-Wen Pang
- Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), State Key Laboratory of Virology, College of Chemistry and Molecular Sciences, Institute of Advanced Studies, Wuhan University, Wuhan, China
| | - Qi-Ya Zhang
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, China
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