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Effect of methionine-enkephalin analog (FK 33-824) on plasma motilin
Abstract:
In an attempt to elucidate the effect of opioid peptide on the secretion of various gastrointestinal hormones, the methionine-enkephalin analog, FK 33-824 (FK) was injected intramuscularly in healthy male adults. The plasma levels of motilin, gastrin and cholecystokinin were assessed by specific radioimmunoassay. After the injection of FK, the plasma level of motilin markedly decreased from the baseline value of 456 +/- 70.2 pg/ml to 264 +/- 44.7 pg/ml at 120 min. On the other hand, the plasma levels of cholecystokinin and gastrin remained unchanged. These data indicate that endogenous methionine-enkephalin may have an direct inhibitory effect on the secretion of motilin.
Insights
Opioid peptides, specifically methionine-enkephalin analog FK 33-824, were found to significantly decrease motilin levels in healthy adults. This suggests an inhibitory effect of endogenous methionine-enkephalin on motilin secretion.
Area of Science:
- Gastroenterology
- Endocrinology
- Neuroscience
Background:
- Opioid peptides play a role in regulating various physiological processes.
- Gastrointestinal hormones, such as motilin, gastrin, and cholecystokinin, are crucial for digestive function.
- The precise influence of opioid peptides on gastrointestinal hormone secretion requires further elucidation.
Purpose of the Study:
- To investigate the effect of a methionine-enkephalin analog on the secretion of motilin, gastrin, and cholecystokinin in healthy male adults.
- To determine if endogenous methionine-enkephalin influences the release of these key gastrointestinal hormones.
Main Methods:
- Administration of methionine-enkephalin analog FK 33-824 via intramuscular injection to healthy male participants.
- Quantification of plasma levels of motilin, gastrin, and cholecystokinin using radioimmunoassay.
- Comparison of hormone levels before and after FK 33-824 administration.
Main Results:
- A marked decrease in plasma motilin levels was observed post-injection, from 456 +/- 70.2 pg/ml to 264 +/- 44.7 pg/ml at 120 minutes.
- Plasma levels of gastrin and cholecystokinin remained unchanged after FK 33-824 administration.
- The observed reduction in motilin suggests a specific inhibitory effect.
Conclusions:
- Endogenous methionine-enkephalin appears to exert a direct inhibitory effect on motilin secretion.
- This finding contributes to understanding the neuroendocrine regulation of gastrointestinal hormone release.
- Further research may explore the clinical implications of this opioid-motilin interaction.