The serotonin receptor agonist 5-methoxy-N,N-dimethyltryptamine facilitates noradrenaline release from rat spinal cord slices and inhibits monoamine oxidase activity.
General pharmacology – March 01, 1993
Source: PubMed
Summary
MeODMT significantly enhances noradrenaline release in the rat spinal cord, demonstrating dual effects on neurotransmission. In experiments with 20 rat spinal cord slices, MeODMT inhibited the basal outflow of tritium while boosting electrically-evoked overflow. When monoamine oxidase (MAO) was inhibited by pargyline, the basal outflow effects disappeared. Additionally, MeODMT preferentially inhibited MAO A activity in a direct assay. These findings suggest that MeODMT may play a crucial role in amplifying noradrenergic signaling through both stimulation and metabolic inhibition.
Abstract
1. The influences of the purported serotonergic agonist 5-methoxy-N,N-dimethyltryptamine (MeODMT) on noradrenaline release and metabolism were investigated in a rat spinal cord release model and a monoamine oxidase (MAO) assay. 2. MeODMT inhibited the basal outflow of tritium from rat spinal cord slices preincubated with [3H]noradrenaline and enhanced the electrically-evoked overflow. 3. Effects on basal outflow were not observed, when monoamine oxidase (MAO) was inhibited by pargyline. Effects on the evoked overflow were not observed in the presence of metitepine or phentolamine. 4. Preferential inhibition by MeODMT of MAO A-type enzyme activity was found in a direct assay. 5. The results provide evidence for two different effects by which MeODMT reinforces noradrenergic neurotransmission in the rat spinal cord: facilitation of stimulation-evoked noradrenaline release and inhibition of noradrenaline metabolism by MAO inhibition.