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Updated: Apr 30, 2026
A Rapid Image-based Bacterial Virulence Assay Using Amoeba
Published on: June 27, 2018
Assessing Pseudomonas virulence using host cells
Iwona Bucior1, Cindy Tran, Joanne Engel
1Department of Medicine, University of California, San Francisco, 0654, Room S380, 513 Parnassus Ave, San Francisco, CA, 94143-0654, USA.
Abstract:
While human or animal models are often considered the gold standard experimental system for defining virulence factors, cell culture-based infection models have proven useful for identifying important virulence factors and for examining the interactions between pathogens and the epithelial barrier. The first step in infections for most mucosal pathogens involves binding (adhesion) to the epithelial cells that line the mucosa. Successful pathogens can then penetrate the barrier by (1) inducing their uptake (i.e., "entry" or "invasion") into epithelial cells, (2) crossing the barrier by inducing epithelial cell death, and/or (3) penetrating between cells. This chapter describes growth conditions to form polarized cultures, either two-dimensional monolayers or three-dimensional cysts, of various immortalized epithelial cell lines. It describes assays to measure key early interactions between P. aeruginosa and host cells, including binding, invasion, and cytotoxicity. Many virulence factors defined by these criteria have been shown to be important for pathogenesis of P. aeruginosa infections in animals or humans. These methods are also applicable to other pathogens.
Insights
Cell culture models effectively identify pathogen virulence factors and interactions with epithelial barriers. These methods, including binding and invasion assays, are crucial for understanding infection pathogenesis.
Area of Science:
- Microbiology
- Cell Biology
- Pathogenesis Research
Background:
- Human and animal models are gold standards for virulence factor definition.
- Cell culture models offer a valuable system for studying pathogen-epithelial interactions.
- Understanding pathogen adhesion and invasion is critical for infection progression.
Purpose of the Study:
- To describe methods for creating polarized epithelial cell cultures (2D monolayers and 3D cysts).
- To detail assays for measuring early pathogen-host cell interactions, specifically binding, invasion, and cytotoxicity.
- To highlight the utility of these cell-based models for identifying virulence factors.
Main Methods:
- Culturing immortalized epithelial cell lines to form polarized 2D monolayers and 3D cysts.
- Performing assays to quantify pathogen (e.g., P. aeruginosa) binding to epithelial cells.
- Assessing pathogen invasion into epithelial cells and measuring cytotoxicity.
Main Results:
- Established methods for generating polarized epithelial cell cultures.
- Developed and validated assays for measuring key early infection events.
- Identified virulence factors crucial for P. aeruginosa pathogenesis through these cell-based assays.
Conclusions:
- Cell culture models are effective for identifying pathogen virulence factors and studying host-pathogen interactions.
- The described methods are applicable to various pathogens and contribute to understanding infection mechanisms.
- These findings have implications for both basic research and potential therapeutic strategies.
