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Gamma-interferon modifies guinea pig airway functions in vitro
H Chen1, M Munakata, M Amishima
1First Department of Medicine, School of Medicine, Hokkaido University, Sapporo, Japan.
The European Respiratory Journal
|January 1, 1994
Summary
Gamma interferon (IFN-gamma) enhances airway smooth muscle relaxation to beta-adrenergic agonists in guinea pigs. This effect is mediated by epithelium-derived prostanoids, suggesting a role for IFN-gamma in asthma airway inflammation.
Area of Science:
- Immunology
- Respiratory Medicine
- Pharmacology
Background:
- T-lymphocyte-derived cytokines, such as gamma interferon (IFN-gamma), play a role in airway inflammation associated with bronchial asthma.
- IFN-gamma is known to modulate the function of various immune and non-immune cells.
Purpose of the Study:
- To investigate the in vitro effects of IFN-gamma on guinea pig airway smooth muscle function.
- To determine if IFN-gamma influences airway contractility and relaxation responses.
Main Methods:
- Isometric tension measurements of guinea pig airway strips in a tissue bath.
- Assessment of contractile responses to carbachol and KCl.
- Evaluation of relaxation responses to isoproterenol (ISO) after incubation with varying concentrations of IFN-gamma.
Main Results:
- IFN-gamma did not significantly alter contractile responses to carbachol or KCl, except for a slight increase in carbachol contraction after prolonged incubation.
- IFN-gamma significantly increased sensitivity to ISO-induced relaxation without affecting maximum relaxation.
- The IFN-gamma-induced relaxation effect was abrogated by epithelial denudation, indomethacin, and cycloheximide, but not by N omega-nitro-L-arginine methyl ester.
Conclusions:
- IFN-gamma modifies airway smooth muscle response to beta-adrenergic agonists.
- The mechanism involves the induction of prostanoid release from the airway epithelium.
- These findings suggest a potential role for IFN-gamma in modulating airway hyperresponsiveness in asthma.