简介：
Overview
This article presents a protocol for tracking Influenza A virus (IAV) infections in vivo using a novel bi-reporter system, BIRFLU, which expresses both luciferase and fluorescence. This innovative approach enhances the study of IAV by allowing simultaneous in vitro and in vivo analysis.
Key Study Components
Area of Science
- Virology
- Infectious Diseases
- Immunology
Background
- Influenza A viruses are significant respiratory pathogens.
- Existing recombinant viruses typically express either fluorescent or bioluminescent reporters.
- The BIRFLU system overcomes limitations of single reporter expression.
- This method allows for comprehensive tracking of viral infections.
Purpose of Study
- To develop a dual-reporter system for enhanced tracking of IAV.
- To facilitate both in vitro and in vivo studies using a single recombinant virus.
- To evaluate the effectiveness of antiviral treatments and immune responses.
Methods Used
- Preparation of BIRFLU in 1X PBS for mouse inoculation.
- Intranasal inoculation of mice with BIRFLU.
- Administration of luciferase substrate for bioluminescent imaging.
- Ex vivo imaging of mouse lungs to assess viral replication and reporter expression.
Main Results
- BIRFLU successfully expresses both fluorescent and bioluminescent reporters.
- High bioluminescence and fluorescence were observed in infected mice.
- Viral titers and genetic stability were confirmed through plaque assays.
- Replication kinetics of BIRFLU were comparable to wild-type PR8 virus.
Conclusions
- BIRFLU is a powerful tool for studying IAV infections.
- This dual-reporter system can enhance the understanding of viral dynamics.
- It provides a platform for evaluating antiviral efficacy and immune responses.
What is BIRFLU?
BIRFLU is a recombinant influenza virus that expresses both luciferase and fluorescence reporters, allowing for enhanced tracking of infections.
How is BIRFLU administered to mice?
BIRFLU is administered intranasally to mice after preparation in 1X PBS.
What imaging techniques are used in this study?
Bioluminescent and fluorescent imaging techniques are used to monitor viral infections in vivo and ex vivo.
What are the advantages of using BIRFLU?
BIRFLU allows for simultaneous in vitro and in vivo studies using a single recombinant virus, enhancing experimental efficiency.
How is the effectiveness of antiviral treatments evaluated?
The effectiveness is evaluated through viral titers and the expression of reporter genes in infected tissues.
What precautions should be taken when handling mice?
Mice should be properly anesthetized, and their chests should be shaved to improve detection of bioluminescent signals.
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