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Expression of CCR8 is increased in asthma
K Mutalithas1, C Guillen, C Raport
1Department of Infection, Immunity and Inflammation, Institute for Lung Health, University of Leicester, Leicester, UK.
Summary
CCR8 is elevated on T cells in asthmatic lungs, suggesting a role in T cell recruitment. This chemokine receptor is more prevalent on specific T-helper cells, indicating its importance in asthma pathogenesis.
Area of Science:
- Immunology
- Respiratory Medicine
- Cell Biology
Background:
- Chemokines and their receptors are implicated in T cell recruitment to the lungs in asthma.
- CCR8 is specifically expressed on T-helper type 2 cells and is a potential factor in human asthma development.
Purpose of the Study:
- To determine the expression levels of CCR8 on T cells within the blood, bronchoalveolar lavage (BAL), and bronchial mucosa of individuals with asthma and healthy controls.
Main Methods:
- Flow cytometry was utilized to analyze CCR8 expression in blood and BAL samples from asthmatic and normal subjects.
- CCR8 expression on specific T cell subsets (IFN-gamma+ and IL-4+/IL-13+) was assessed after in vitro stimulation.
- CCR8 presence in bronchial epithelium was examined using paraffin-embedded bronchial biopsies.
Main Results:
- Asthmatics showed significantly higher CCR8 expression on blood CD3+ T cells compared to normal subjects.
- CCR8 was significantly enriched on IL-4+/IL-13+ T cells compared to IFN-gamma+ T cells in both groups.
- Elevated CCR8 expression was observed on T cells in the BAL of asthmatics, with higher levels in BAL compared to blood in asthmatic patients.
- Bronchial biopsies revealed more CCR8-positive cells in asthmatics than in normal subjects.
- The ligand CCL1 was found to be increased in the BAL of asthmatics.
Conclusions:
- The findings suggest a potential role for CCR8 in the migration of T cells into the lungs of individuals with asthma.
- CCR8 expression patterns indicate its involvement in the inflammatory processes characteristic of asthma.
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