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Updated: Aug 17, 2026
Measurement of Cellular Chemotaxis with ECIS/Taxis
Published on: April 1, 2012
Chemotaxis of human CD4+ eosinophils
Y Okubo1, A Tsukadaira, S Takashi
1First Department of Internal Medicine, Shinshu University School of Medicine, Matsumoto, Japan. okuboyo@hsp.md.shinshu-u.ac.jp
Insights
Tumor necrosis factor-alpha (TNF-alpha) induces CD4 molecules on human eosinophils, which are crucial in airway inflammation. Theophylline and dexamethasone inhibit CD4 expression, impacting eosinophil migration and inflammation.
Area of Science:
- Immunology
- Cell Biology
- Respiratory Medicine
Background:
- CD4+ eosinophils are implicated in various diseases.
- Tumor necrosis factor-alpha (TNF-alpha) stimulation induces CD4 molecules on human eosinophils.
- Interleukin-16 (IL-16) binds to the CD4 molecule.
Purpose of the Study:
- To investigate the biological functions of CD4+ eosinophils.
- To examine the effect of TNF-alpha on CD4 expression in eosinophils.
- To evaluate the impact of theophylline and dexamethasone on CD4+ eosinophils and their migration.
Main Methods:
- Stimulation of human eosinophils with TNF-alpha.
- Assessment of CD4 molecule expression.
- Chemotaxis assays using IL-16 as a chemoattractant.
- Treatment with theophylline and dexamethasone.
Main Results:
- TNF-alpha stimulation induced CD4 molecules on human eosinophils.
- TNF-alpha-stimulated eosinophils exhibited time- and dose-dependent migration towards IL-16.
- Theophylline and dexamethasone significantly inhibited CD4 expression on eosinophils.
- Theophylline inhibited CD4+ eosinophil chemotaxis, while dexamethasone did not.
- Both drugs potentially inhibit airway inflammation through distinct mechanisms.
Conclusions:
- Theophylline may prevent airway inflammation by downregulating CD4 expression and eosinophil migration.
- Dexamethasone may inhibit airway inflammation by downregulating CD4 expression.
- CD4+ eosinophils represent a potential therapeutic target in airway inflammatory diseases.
Abstract:
We reviewed the biological functions of CD4+ eosinophils, which are observed in peripheral blood, sputum and bronchoalveolar lavage fluid of various diseases. We have shown that CD4 molecules on human eosinophils are induced by tumor necrosis factor-alpha (TNF-alpha) stimulation. Interleukin-16 (IL-16) has been reported to bind a natural soluble ligand for the CD4 molecule. We reported that TNF-alpha-stimulated eosinophils migrate in a time- and dose-dependent manner against IL-16. Theophylline and dexamethasone significantly inhibited CD4 expression. Theophylline inhibited CD4+ eosinophil chemotaxis, but dexamethasone did not. Theophylline may prevent airway inflammation by downregulating the expression of CD4 molecule and CD4+ eosinophil migration. However, dexamethasone may inhibit airway inflammation through the downregulation of CD4 expression.
