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FMRFamide enhances acetylcholine-induced contractions of guinea pig ileum
1Department of Biological Research, Janssen Research Foundation, Spring House, PA 19477-0776.
Abstract:
Isolated guinea pig ilea were contracted with acetylcholine (ACh) in the absence and presence of the neuropeptide FMRFamide (Phe-Met-Arg-Phe-NH2). FMRFamide (0.17-17 microM) enhanced ACh-induced contractions (observed as a leftward shift of the dose-response curve and increase in Emax) with maximal effect at 1.7 microM. FMRFamide had no effect when administered alone. These results extend the demonstration of a FMRFamide/ACh interaction to mammalian tissue and support the concept that FMRFamide, or mammalian equivalents, could play a modulatory role in mammals.
Insights
The neuropeptide FMRFamide enhances acetylcholine-induced muscle contractions in guinea pig ilea. This suggests FMRFamide or similar molecules may modulate functions in mammals.
Area of Science:
- Pharmacology
- Neuroscience
- Gastroenterology
Background:
- Neuropeptides like FMRFamide (Phe-Met-Arg-Phe-NH2) are known to modulate physiological processes.
- Previous studies have indicated interactions between FMRFamide and acetylcholine (ACh) in invertebrate systems.
Purpose of the Study:
- To investigate the effect of FMRFamide on acetylcholine-induced contractions in isolated mammalian ileum.
- To determine if FMRFamide plays a modulatory role in mammalian gastrointestinal tissue.
Main Methods:
- Isolated guinea pig ileum preparations were used.
- Muscle contractions were induced by acetylcholine (ACh).
- The effects of varying concentrations of FMRFamide on ACh-induced contractions were measured.
Main Results:
- FMRFamide significantly enhanced ACh-induced contractions in a dose-dependent manner.
- The maximal effect of FMRFamide was observed at 1.7 microM.
- FMRFamide alone did not induce contractions, indicating a modulatory, not direct, effect.
Conclusions:
- This study demonstrates a FMRFamide/ACh interaction in mammalian ileum.
- Results support the hypothesis that FMRFamide or its mammalian analogs could modulate physiological functions in mammals.