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Bacterial invasion: Force feeding by Salmonella
J H Brumell1, O Steele-Mortimer, B B Finlay
1Biotechnology Laboratory, University of British Columbia, Vancouver, Canada.
Current Biology : CB
|May 5, 1999
Summary
Salmonella invades mammalian cells by injecting virulence factors into host cells. This triggers pathways that rearrange the cell
Area of Science:
- Microbiology
- Cell Biology
- Bacterial Pathogenesis
Background:
- Salmonella is a significant bacterial pathogen.
- Understanding Salmonella's invasion mechanisms is crucial for developing effective treatments.
Purpose of the Study:
- To elucidate the molecular mechanisms underlying Salmonella invasion of mammalian cells.
- To identify key bacterial factors and host pathways involved in bacterial uptake.
Main Methods:
- Utilized a type III secretion system (T3SS) to deliver bacterial virulence factors into host cells.
- Investigated the activation of host signal transduction pathways.
- Observed cytoskeletal rearrangements and bacterial engulfment.
Main Results:
- Salmonella's T3SS directly delivers effector proteins into host cells.
- These effectors activate specific host signal transduction pathways.
- Activation leads to cytoskeletal rearrangements and bacterial uptake via host cell ruffling.
Conclusions:
- Salmonella employs a sophisticated T3SS to manipulate host cell machinery for invasion.
- The process involves direct activation of host signaling, leading to bacterial internalization.
- This mechanism highlights a key virulence strategy of Salmonella.