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Shigella flexneri-HeLa cell interactions: a putative role for host cell protein kinases
1Department of Microbiology and Immunology, University of Texas Medical Branch, Galveston 77555-1019, USA.
FEMS Immunology and Medical Microbiology
|January 1, 1995
Summary
Shigella flexneri infection triggers changes in host cell proteins, specifically those containing phosphotyrosine. Protein kinase inhibitors reduced bacterial invasion, suggesting their role in the host cell
Area of Science:
- Microbiology
- Cell Biology
- Molecular Biology
Background:
- Epithelial cell invasion is crucial for Shigella flexneri virulence.
- Previous studies identified transcription factor activation following S. flexneri challenge.
- Host cell responses to bacterial pathogens involve complex signaling pathways.
Purpose of the Study:
- To investigate host cell protein modifications, specifically phosphotyrosine-containing proteins, during S. flexneri infection.
- To determine the role of protein kinases in the initial stages of S. flexneri invasion.
Main Methods:
- HeLa cells were challenged with wild-type S. flexneri and an ipaB mutant.
- Analysis of phosphotyrosine-containing proteins in host cells and bacteria.
- Assessment of bacterial invasion following treatment with protein kinase inhibitors.
Main Results:
- S. flexneri challenge induced rapid changes in host cell phosphotyrosine-protein profiles within 5 minutes.
- A noninvasive ipaB mutant elicited a similar but weaker phosphotyrosine-protein response.
- Bacterial invasion was significantly reduced by protein kinase inhibitors.
Conclusions:
- Protein kinases play a role in the early host cell response to S. flexneri.
- Phosphotyrosine-containing proteins are early indicators of host cell engagement by S. flexneri.
- Targeting host cell signaling pathways may offer strategies to combat Shigella infections.