Related Experiment Videos
IgE-mediated 14C-serotonin release from rat mast cells modulated by morphine and endorphins
Abstract:
The formaldehyde method was used to examine the interaction of PGE1 with morphine, beta-endorphin and Met-enkephalin on rat mast cells by their effects on IgE-mediated 14C-serotonin release. PGE1 (2x10(-8) -2x10(-5) M) caused a dose-related inhibition of the mediator release 1 min after an antigen challenge, and morphine (3x10(-7) -3x10(-5) M) reversed this PGE1 effect dose-dependently and stereospecifically; naloxone (2x10(-4) M) antagonized this action of morphine. Beta-Endorphin (3x10(-7) -10(-5) M) and Met-enkephalin (3x10(-6) -10(-4) M) mimicked this morphine action dose-dependently and were antagonized by naloxone (2x10(-4) M). These results suggest that morphine and endorphins modulate immunological mediator release from rat mast cells through opioid receptors.
Insights
Prostaglandin E1 (PGE1) inhibits mediator release from rat mast cells. Morphine and endorphins reversed this effect, suggesting opioid receptors modulate immune responses.
Area of Science:
- Immunology
- Pharmacology
- Neuroscience
Background:
- Prostaglandin E1 (PGE1) plays a role in modulating immune responses.
- Opioid compounds like morphine and endorphins are known to interact with cellular signaling pathways.
Purpose of the Study:
- To investigate the interaction between PGE1, morphine, beta-endorphin, and Met-enkephalin on rat mast cells.
- To determine the effect of these substances on immunoglobulin E (IgE)-mediated 14C-serotonin release.
Main Methods:
- Formaldehyde method utilized for examining cellular interactions.
- Measurement of 14C-serotonin release from rat mast cells following antigen challenge.
- Dose-response and antagonism studies using morphine, beta-endorphin, Met-enkephalin, and naloxone.
Main Results:
- PGE1 demonstrated a dose-related inhibition of mediator release.
- Morphine reversed the inhibitory effect of PGE1 in a dose-dependent and stereospecific manner.
- Beta-endorphin and Met-enkephalin mimicked the action of morphine and were antagonized by naloxone.
Conclusions:
- Morphine and endorphins modulate immunological mediator release from rat mast cells.
- These modulatory effects appear to be mediated through opioid receptors.