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Bacterial adherence and epithelial cell cytokine production
C Svanborg1, W Agace, S Hedges
1Dept. of Medical Microbiology, University of Lund, Sweden.
Zentralblatt Fur Bakteriologie : International Journal of Medical Microbiology
|April 1, 1993
Summary
Epithelial cells release inflammatory cytokines like IL-6 and IL-8 when exposed to E. coli, especially when P fimbriae are present. This immune response, observed in vitro and in patients, highlights epithelial cells
Area of Science:
- Immunology
- Microbiology
- Cell Biology
Background:
- Epithelial cells form the first line of defense against pathogens.
- The role of epithelial cells in initiating mucosal immune responses is not fully understood.
- Cytokine production by epithelial cells is a key component of innate immunity.
Purpose of the Study:
- To investigate the cytokine response of epithelial cells to Escherichia coli stimulation.
- To determine the role of P fimbriae in enhancing this response.
- To validate in vitro findings in a clinical setting.
Main Methods:
- In vitro stimulation of epithelial cell lines with E. coli and purified P fimbriae.
- Measurement of cytokine (IL-1 alpha, IL-6, IL-8) production using established assays.
- Analysis of cytokine levels in urine samples from patients with E. coli infections.
Main Results:
- Epithelial cell lines produced IL-1 alpha, IL-6, and IL-8 upon E. coli stimulation.
- The presence of P fimbriae significantly enhanced the epithelial cell cytokine response.
- Elevated levels of IL-6 and IL-8 were detected in the urine of patients with E. coli infections, correlating with in vitro findings.
Conclusions:
- Epithelial cells actively participate in the mucosal immune response to E. coli.
- P fimbriae play a crucial role in modulating the epithelial cell-mediated immune response.
- These findings suggest epithelial cells are key players in host defense against urinary tract infections.