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Endogenous mast cell degranulation modulates cervical contractility in the guinea pig
Egle Bytautiene1, Yuri P Vedernikov, George R Saade
1Department of Obstetrics & Gynecology, Division of Reproductive Sciences, The University of Texas Medical Branch, Galveston 77555-1062, USA.
American Journal of Obstetrics and Gynecology
|March 21, 2002
Summary
Mast cell degranulation releases histamine, increasing cervical strip contractility via histamine-1 receptors. This suggests mast cells play a role in regulating cervical function during pregnancy.
Area of Science:
- Reproductive biology
- Immunology
- Pharmacology
Background:
- Mast cells are immune cells involved in allergic reactions and inflammation.
- Cervical contractility is crucial for maintaining pregnancy and labor.
Purpose of the Study:
- To investigate how mast cell degranulation affects cervical tissue contractility in pregnant and non-pregnant guinea pigs.
- To identify the specific mediators and receptors involved in this process.
Main Methods:
- Isometric tension recording of isolated cervical strips from guinea pigs at different stages of pregnancy.
- Administration of mast cell degranulating agent (compound 48/80) and various inhibitors/antagonists.
- Concentration-response curves for histamine and 5-hydroxytryptamine.
Main Results:
- Compound 48/80 and histamine significantly increased cervical contractility in all groups.
- Histamine-1 receptor antagonist reduced responses to both histamine and compound 48/80.
- 5-hydroxytryptamine-2 receptor antagonist inhibited compound 48/80-induced contractility in pregnant groups.
Conclusions:
- Mast cell degranulation releases histamine, stimulating cervical contractility primarily through histamine-1 receptors.
- Mast cells may influence cervical function during pregnancy, potentially playing a role in both normal physiology and pathology.