Related Experiment Videos
An isometric method to study respiratory smooth muscle responses in mice
J Garssen1, H Van Loveren, H Van Der Vliet
1Department of Pharmacology, Faculty of Pharmacy, University of Utrecht, The Netherlands.
Journal of Pharmacological Methods
|November 1, 1990
Summary
A new in vitro method measures mouse trachea smooth muscle tone. This model aids airway reactivity studies, offering advantages over immunopharmacologic models due to the well-characterized mouse immune system.
Area of Science:
- Pharmacology
- Physiology
- Immunology
Background:
- Smooth muscle tone in airways is crucial for regulating airflow.
- Understanding airway reactivity is essential for developing treatments for respiratory diseases.
- Existing animal models for airway reactivity have limitations, particularly in immunological characterization.
Purpose of the Study:
- To develop and validate an isometric method for measuring smooth muscle tone in murine tracheas in vitro.
- To characterize the contractile and relaxant responses of isolated mouse tracheas to various agonists and antagonists.
- To highlight the advantages of this mouse trachea model for studying airway reactivity compared to immunopharmacologic models.
Main Methods:
- Preparation of isolated murine trachea rings (n=9) from below the larynx.
- Measurement of isometric tension in an organ bath using a force displacement transducer.
- Administration of cholinergic agonists (carbachol), serotonin, histamine, and sympathomimetic beta adrenergic agonists (isoprenaline, salbutamol, prenalterol) and adrenergic agonists (adrenaline, noradrenaline).
Main Results:
- Carbachol and serotonin induced significant tracheal contractions, with carbachol being more potent.
- Histamine caused contractions only at high concentrations.
- Beta adrenergic agonists and adrenaline/noradrenaline relaxed carbachol-precontracted tracheas, demonstrating varying potencies.
- Isoprenaline was the most potent beta adrenergic agonist, followed by salbutamol and prenalterol.
Conclusions:
- The developed isometric method provides a reliable tool for assessing murine tracheal smooth muscle tone in vitro.
- This model effectively demonstrates contractile responses to agonists and relaxant effects of beta adrenergic and adrenergic agents.
- The mouse trachea model offers significant advantages for airway reactivity research due to the extensive characterization of the mouse immune system and available reagents.