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Bacteria-host cell interaction mediated by cellular cholesterol/glycolipid-enriched microdomains
1Department of Pathology, Duke University Medical Center, Durham, NC 27710, USA.
Bioscience Reports
|April 14, 2000
Summary
Gram-negative bacteria evade antibiotics by entering mast cells, a process dependent on cholesterol. Mast cells expel these bacteria, a mechanism also involving cholesterol, offering new insights into host-pathogen interactions.
Area of Science:
- Immunology
- Microbiology
- Cell Biology
Background:
- Gram-negative bacterial infections are a significant cause of mortality.
- Bacteria can persist within host cells, evading antibiotic treatment.
- Mast cells play a role in the early innate immune response to bacterial infections.
Purpose of the Study:
- To investigate how bacteria interact with and persist within mast cells.
- To understand the mechanisms of bacterial entry and exit from mast cells.
- To explore the role of host cell components in bacterial evasion.
Main Methods:
- Examined mast cell interactions with FimH-expressing Escherichia coli (E. coli) under serum-free conditions.
- Identified CD48 as the receptor for FimH-expressing E. coli on mouse mast cells.
- Utilized cholesterol-binding drugs (filipin, lovastatin/cyclodextrin) to investigate the role of cholesterol-enriched microdomains.
Main Results:
- E. coli entered mast cells without loss of viability, utilizing CD48 as a receptor.
- Bacterial internalization was dependent on cholesterol/glycolipid-enriched microdomains.
- Mast cells expelled most intracellular bacteria within 24 hours.
- Both bacterial entry and expulsion were critically dependent on cholesterol/glycolipid-enriched microdomains.
Conclusions:
- Bacterial entry into and expulsion from mast cells are critically dependent on cholesterol/glycolipid-enriched microdomains.
- This represents a novel mechanism of host-pathogen interaction, particularly relevant in opsonin-deficient environments.
- Understanding this process could inform strategies against persistent bacterial infections in vulnerable hosts.