Related Experiment Videos
NPFF, a FMRF-NH2-like peptide, blocks opiate effects on ileum contractions
P Demichel1, J C Rodriguez, J Roquebert
1Laboratoire de Pharmacodynamie, Faculté de Pharmacie, Université de Bordeaux II, France.
Abstract:
We studied the ability of NPFF, a FMRFamide-like peptide with certain antiopiate properties, to affect the inhibitory effect of morphine on the electrically induced contraction of guinea pig ileum. Neuropeptide FF had no effect when administered alone but reduced morphine inhibition in a noncompetitive manner. Neuropeptide FF also altered the inhibitory effect of opioid peptides as released by an intense electrical stimulation at 10 Hz. These results suggest that NPFF receptors exist in guinea pig ileum in association with opiate receptors, and that endogenous NPFF may play a role in the diarrhea observed in the morphine withdrawal syndrome.
Insights
Neuropeptide FF (NPFF) noncompetitively reduces morphine's inhibitory effects on guinea pig ileum contractions. This suggests NPFF receptors interact with opiate receptors, potentially influencing morphine withdrawal symptoms like diarrhea.
Area of Science:
- Pharmacology
- Neuroscience
- Gastroenterology
Background:
- FMRFamide-like peptides, including Neuropeptide FF (NPFF), possess antiopiate properties.
- Morphine exerts inhibitory effects on smooth muscle contractions, such as in the guinea pig ileum.
- Understanding opioid-peptide interactions is crucial for pain management and side effect mitigation.
Purpose of the Study:
- To investigate the influence of Neuropeptide FF (NPFF) on the anti-motility effects of morphine in the guinea pig ileum.
- To elucidate the mechanism by which NPFF modulates opioid peptide inhibition.
- To explore the potential role of endogenous NPFF in morphine withdrawal.
Main Methods:
- Electrically induced contractions of guinea pig ileum segments were measured.
- The effects of NPFF alone and in combination with morphine were assessed.
- The impact of NPFF on opioid peptide inhibition during high-frequency electrical stimulation was evaluated.
Main Results:
- NPFF alone did not affect ileum contractions.
- NPFF significantly reduced the inhibitory effect of morphine in a noncompetitive manner.
- NPFF altered the inhibitory action of endogenously released opioid peptides.
Conclusions:
- NPFF receptors are present in the guinea pig ileum and are associated with opiate receptors.
- NPFF modulates the efficacy of morphine and other opioid peptides.
- Endogenous NPFF may contribute to the pathophysiology of diarrhea during morphine withdrawal.