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Macrophage migration inhibitory factor (MIF) in bronchial asthma
E Yamaguchi1, J Nishihira, T Shimizu
1The First Department of Medicine, School of Medicine, Hokkaido University, Japan.
Summary
Macrophage migration inhibitory factor (MIF) is elevated in asthma patients, correlating with symptoms and airway eosinophils. Eosinophils are identified as a source of MIF in the airways, highlighting its role in asthma pathogenesis.
Area of Science:
- Immunology
- Respiratory Medicine
- Biochemistry
Background:
- Macrophage migration inhibitory factor (MIF) is a pro-inflammatory cytokine.
- MIF promotes TNF-alpha and IL-8 secretion and opposes corticosteroid effects.
- Airway inflammation, marked by eosinophil accumulation, is key in bronchial asthma.
Purpose of the Study:
- To investigate the relationship between MIF and asthma symptoms.
- To determine if MIF is linked to eosinophil accumulation in airways.
Main Methods:
- Serum MIF levels measured via ELISA in 44 asthmatics and 44 controls.
- Induced sputum MIF and eosinophil cationic protein (ECP) levels measured.
- Cellular source and localization of MIF examined using fluorescence double immunostaining.
Main Results:
- Asthmatic patients showed significantly higher serum MIF levels than controls.
- Symptomatic asthmatics had higher MIF levels than asymptomatic ones.
- Sputum MIF levels correlated with ECP levels and MIF colocalized with eosinophils.
Conclusions:
- Elevated MIF levels are associated with asthma symptoms.
- Eosinophils are a cellular source of MIF in the airways.
- MIF plays a role in airway inflammation and asthma severity.