Biochemistry and pharmacology of moclobemide, a prototype RIMA
W Haefely1, W P Burkard, A M Cesura
1Pharmaceutical Research Department CNS, F. Hoffmann-La Roche Ltd, Basel, Switzerland.
Psychopharmacology
|January 1, 1992
Summary
Reversible inhibitors of monoamine oxidase (MAO), like moclobemide, selectively inhibit MAO-A. This leads to increased brain serotonin and noradrenaline, offering a new antidepressant approach with fewer side effects than irreversible MAO inhibitors.
Area of Science:
- Neuroscience
- Pharmacology
Background:
- Reversible inhibitors of monoamine oxidase (RIMA) represent a novel class of antidepressants.
- Moclobemide is the prototype RIMA, exhibiting high selectivity for monoamine oxidase A (MAO-A) in vitro.
Purpose of the Study:
- To elucidate the biochemical and physiological effects of moclobemide, a selective MAO-A inhibitor.
- To understand the role of MAO in neurotransmitter regulation and neuronal function.
Main Methods:
- In vitro studies assessing MAO-A inhibition and reversibility.
- In vivo analysis of neurotransmitter and metabolite levels in the brain.
- Behavioral and neurological effect assessments.
Main Results:
- Moclobemide demonstrated reversible, dose-dependent inhibition of MAO-A.
- Increased brain concentrations of serotonin, noradrenaline, and dopamine were observed.
- Reduced levels of deaminated metabolites and less pronounced tyramine potentiation compared to irreversible MAO inhibitors.
Conclusions:
- Moclobemide increases extracellular monoamine neurotransmitters, particularly serotonin.
- MAO plays a crucial role in regulating intracellular amine concentrations and terminating neurotransmitter action.
- RIMAs offer a potentially safer alternative to irreversible MAO inhibitors for treating depression.
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