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Nitric oxide and airway reactivity
1Dept of Pharmacology, Jessenius Faculty of Medicine, Comenius University, Sklabinska 26, SK-037 53 Martin, Slovakia.
Bratislavske Lekarske Listy
|January 5, 2002
Summary
Nitric oxide (NO) plays a role in regulating airway reactivity following toluene exposure. Administration of NO donors like isosorbide dinitrate, especially with N-acetylcysteine, reduced airway smooth muscle reactivity to histamine.
Area of Science:
- Respiratory Physiology
- Neuropharmacology
- Toxicology
Background:
- Nitric oxide (NO) acts as an inhibitory neurotransmitter in the respiratory system.
- NO's role in regulating airway function is linked to its endogenous levels.
Purpose of the Study:
- To investigate the involvement of NO in airway reactivity changes induced by toluene exposure.
- To assess the effects of isosorbide dinitrate (NO donor) and N-acetylcysteine (antioxidant) on toluene-induced airway responses.
Main Methods:
- Animals were pretreated with isosorbide dinitrate and/or N-acetylcysteine before toluene vapor exposure.
- Airway smooth muscle reactivity to histamine was measured in vitro using tracheal and lung strips.
- Different administration routes (intraperitoneal, inhalation) for isosorbide dinitrate were compared.
Main Results:
- Isosorbide dinitrate significantly decreased lung strip smooth muscle reactivity to histamine.
- Intraperitoneal administration of isosorbide dinitrate showed a more pronounced effect than inhalation.
- N-acetylcysteine enhanced the protective effects of isosorbide dinitrate, suggesting a role for thiol groups.
Conclusions:
- Nitric oxide likely participates in modulating airway smooth muscle reactivity following toluene exposure.
- Thiol groups are important for the efficacy of indirect nitric oxide donors.