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Inflammatory cytokines modulate eotaxin release by human lung fibroblast cell line
1Research Service, Southern Arizona Veterans Health Care System, and the Department of Medicine, University of Arizona, Tucson 85723, USA.
Experimental Lung Research
|March 22, 2001
Summary
Inflammatory cytokines like IL-1beta and TNF-alpha stimulate lung fibroblasts to release eotaxin, a key factor in asthma. Interferon-gamma can reduce this release, suggesting cytokine networks modulate airway inflammation.
Area of Science:
- Immunology
- Cell Biology
- Respiratory Medicine
Background:
- Eotaxin, an eosinophil chemoattractant, is elevated in asthma.
- Lung fibroblasts are a source of eotaxin and can be modulated by cytokines.
Purpose of the Study:
- To investigate how interleukin-1beta (IL-1beta), tumor necrosis factor-alpha (TNF-alpha), and interferon-gamma (IFN-gamma) affect eotaxin release from lung fibroblasts.
- To determine if these cytokines influence eotaxin mRNA expression in lung fibroblasts.
Main Methods:
- Human fetal lung fibroblast cell line (HFL-1) was cultured.
- Cells were treated with varying concentrations and durations of IL-1beta, TNF-alpha, and IFN-gamma.
- Eotaxin release and mRNA expression were measured.
Main Results:
- HFL-1 constitutively released eotaxin.
- IL-1beta and TNF-alpha dose- and time-dependently increased eotaxin release and mRNA expression.
- IFN-gamma alone had minimal effect but significantly attenuated IL-1beta/TNF-alpha-induced eotaxin release and mRNA expression.
Conclusions:
- Lung fibroblast-derived eotaxin contributes to eosinophil infiltration in asthma.
- Cytokine networks modulate fibroblast eotaxin production, influencing airway inflammation and eosinophil recruitment.
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