Overview
This article presents a protocol for studying the invasion of human endothelial cells by the bacterial pathogen Staphylococcus aureus. The method allows researchers to measure the invasive ability of various bacterial strains and understand their interactions with host cells.
Key Study Components
Area of Science
- Microbial pathogenesis
- Bacterial invasion
- Host-pathogen interactions
Background
- Understanding how bacteria invade host cells is crucial for elucidating disease mechanisms.
- Staphylococcus aureus is a common pathogen associated with various infections.
- Human endothelial cells serve as a model for studying bacterial invasion.
- This research can lead to insights into potential therapeutic targets.
Purpose of Study
- To measure the ability of bacterial strains to invade host cells.
- To identify bacterial proteins involved in host-pathogen interactions.
- To explore the implications of bacterial invasion in disease development.
Methods Used
- Culture of human endothelial cells on glass cover slips.
- Preparation of Staphylococcus aureus cultures and washing procedures.
- Incubation of bacteria with host cells to allow invasion.
- Use of Gentamycin to kill extracellular bacteria and subsequent lysis of host cells.
Main Results
- Wild type Staphylococcus aureus showed significant invasion of endothelial cells.
- Fibronectin binding protein deficient strains exhibited impaired invasion.
- Complementation with fibronectin binding protein restored invasion capabilities.
- Lactococcus lactis expressing fibronectin binding protein was able to invade host cells.
Conclusions
- This protocol effectively demonstrates the invasion of host cells by bacteria.
- Understanding the mechanisms of invasion can inform therapeutic strategies.
- Further research can explore additional questions regarding bacterial pathogenesis.
What is the main focus of this study?
The study focuses on the invasion of human endothelial cells by Staphylococcus aureus.
How are the bacterial strains prepared for the experiment?
Bacterial strains are cultured in broth, washed, and adjusted to a specific optical density before use.
What role does Gentamycin play in the experiment?
Gentamycin is used to kill extracellular bacteria after the invasion period.
How is the invasion of bacteria quantified?
Invasion is quantified by lysing the host cells and plating the lysates on agar plates to count colony forming units.
What are the implications of this research?
The research can help identify therapeutic targets and improve understanding of bacterial pathogenesis.
Who conducted the experiment?
The experiment was conducted by Dr. Andrew Edwards, a postdoctoral researcher.
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