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Anaphylactic bronchoconstriction in BP2 mice: interactions between serotonin and acetylcholine
1Unité de Pharmacologie Cellulaire, Unité Associée Institut Pasteur-INSERM 485, Institut Pasteur 25, Paris, France.
British Journal of Pharmacology
|March 2, 1999
Summary
Ovalbumin (OA) triggers bronchoconstriction in immunized mice by releasing serotonin (5-HT), which then activates the cholinergic mediator acetylcholine (ACh). This pathway involves smooth muscle contraction and can be blocked by specific antagonists.
Area of Science:
- Immunology
- Pharmacology
- Respiratory Physiology
Background:
- Allergic asthma involves airway hyperresponsiveness.
- The roles of serotonin and acetylcholine in ovalbumin-induced responses require further elucidation.
Purpose of the Study:
- To investigate the mechanisms underlying ovalbumin-induced bronchoconstriction in immunized mice.
- To determine the involvement of serotonin and acetylcholine pathways in this response.
Main Methods:
- Immunized BP2 mice were used to assess in vivo and in vitro airway responses to ovalbumin.
- Pharmacological agents including methysergide, atropine, and neostigmine were administered to evaluate their effects on bronchoconstriction.
Main Results:
- Ovalbumin induced dose-dependent bronchoconstriction and airway muscle contraction.
- Methysergide and atropine inhibited these responses, while neostigmine potentiated them.
- Neostigmine potentiation was reversed by methysergide and atropine, suggesting a serotonin and acetylcholine interplay.
Conclusions:
- Ovalbumin-induced bronchoconstriction in immunized mice is mediated by serotonin release.
- Serotonin acts via the cholinergic pathway involving acetylcholine to cause airway smooth muscle contraction.
- Targeting these pathways may offer therapeutic strategies for allergic airway diseases.