A549 Cell Infection
A549 Cell Infection - Related Videos
07:25
Measuring Attachment and Internalization of Influenza A Virus in A549 Cells by Flow Cytometry
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Cited by 5 •
2015
We present a protocol describing a semi-quantitative method for measuring both, the attachment of influenza A virus to A549 cells, as well as the internalization of virus particles into the target cells by flow cytometry.
03:34
Assessing Caspase-Mediated Cleavage of Viral and Host Proteins in Virus-Infected Cells
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2025
The video demonstrates a method to assess caspase-mediated protein cleavage in virus-infected cells. Post-viral infection, caspases get activated and degrade various host cellular proteins and viral nucleoproteins while specific caspase inhibitors prevent this degradation, as confirmed by western blotting.
06:10
Following Cell-fate in E. coli After Infection by Phage Lambda
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Cited by 20 •
2011
This article describes the procedure for preparing a fluorescently-labeled version of bacteriophage lambda, infection of E. coli bacteria, following the infection outcome under the microscope, and analysis of infection results.
07:10
Establishment and Quantification of De Novo Lytic Infection by Cell-free Kaposi's Sarcoma-Associated Herpesvirus
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2025
This protocol describes an in vitro system to model de novo lytic infection of Kaposi's sarcoma-associated herpesvirus using BAC16-derived virions. The method enables investigation of early viral replication and dissemination. Infectious virus production is quantified by GFP-based infectious units assays and real-time PCR of encapsidated viral genomes.
10:14
Generation of 3D Collagen-Embedded A549/MRC-5 Alveolar Organoids using a Mechanical Cell-Stretching Bioreactor
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2026
This protocol outlines the generation of organoids from A549 alveolar epithelial cells and MRC-5 lung fibroblasts on an extracellular matrix hydrogel scaffold, followed by embedding in 3D collagen gels and exposure to mechanical strain using a cell-stretching bioreactor to investigate alveolar mechanobiology.
FAQs
Multiplicity of infection, or MOI, provides a controlled basis for exposing the A549 monolayer to a pathogen. Adjusting this condition changes the initial infection challenge and supports comparisons between experimental groups. Keeping MOI controlled helps researchers relate differences in pathogen burden, cellular damage, or host signaling to the tested condition rather than to an inconsistent exposure.
These stages represent distinct points of pathogen interaction with respiratory epithelial cells. Adhesion reflects attachment to the cell surface, entry indicates penetration into cells, and intracellular replication describes pathogen multiplication when the system supports it. Examining them separately can help clarify whether an intervention or host response affects an early interaction or later pathogen expansion.
The model allows pathogen burden and host responses to be examined in the same experimental setting. Researchers can compare the amount of pathogen or the extent of infection with inflammatory signaling and gene-expression changes in the epithelial cells. This relationship helps place innate immune activity in the context of infection intensity and cellular effects.
A typical workflow begins by culturing A549 cells as a monolayer, followed by exposure to a pathogen at a controlled MOI. The experiment then evaluates infection-associated outcomes, such as pathogen burden, cytopathic effects, inflammatory signaling, or gene expression. This sequence provides a consistent framework for testing how pathogens and experimental treatments affect respiratory epithelial cells.
Key outcomes include pathogen burden, cytopathic effects, inflammatory signaling, and changes in host gene expression. Together, these measurements describe both the pathogen side of the interaction and the cellular response. Comparing these readouts across conditions can reveal whether a treatment changes infection, limits cellular damage, or modifies innate immune activity.
A549 cell infection offers a controlled respiratory-tissue model for studying pathogenesis, innate immune mechanisms, antiviral activity, and therapeutic interventions. It can help researchers examine host-pathogen interactions under defined experimental conditions before or alongside animal and clinical studies. The approach therefore provides complementary evidence while focusing on responses generated by human lung epithelial cells.