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Monoamine oxidase inhibitors (MAOIs) are a class of drugs that inhibit the activity of one or both monoamine oxidase enzymes: monoamine oxidase A (MAO-A) and monoamine oxidase B (MAO-B). They are best known as effective antidepressants , especially for treatment-resistant depression and atypical depression . [ 1 ]
In addition to its MRA activity, 4-MTDMA is a fairly potent monoamine oxidase A (MAO-A) inhibitor, with an IC 50 Tooltip half-maximal inhibitory concentration of 2,100 nM. [4] [5] Potent monoamine oxidase inhibition by amphetamines has been associated with dangerous and sometimes fatal toxicity in humans. [4] [5]
Monoamine oxidase A, also known as MAO-A, is an enzyme (E.C. 1.4.3.4) that in humans is encoded by the MAOA gene. [ 5 ] [ 6 ] This gene is one of two neighboring gene family members that encode mitochondrial enzymes which catalyze the oxidative deamination of amines , such as norepinephrine , serotonin and tyramine .
Monoamine oxidases (MAO) (EC 1.4.3.4) are a family of enzymes that catalyze the oxidation of monoamines, employing oxygen to clip off their amine group. [ 1 ] [ 2 ] They are found bound to the outer membrane of mitochondria in most cell types of the body.
Tryptolines are competitive selective inhibitors of the enzyme monoamine oxidase type A (). 5-Hydroxytryptoline and 5-methoxytryptoline (pinoline) are the most active monoamine oxidase inhibitors (MAOIs) with IC 50 s of 0.5 μM and 1.5 μM respectively.
Harmine is a RIMA, as it reversibly inhibits monoamine oxidase A , but not MAO-B. [4] Oral or intravenous harmine doses ranging from 30 to 300 mg may cause agitation, bradycardia or tachycardia, blurred vision, hypotension, paresthesias. Serum or plasma harmine concentrations may be measured as a confirmation of diagnosis.
October 16, 2024 at 9:30 AM. A once-a-day pill used to treat seizures could also help treat Alzheimer’s disease, a new study suggests. Image credit: Viktoriya Skorikova/Getty Images.
Rasagiline acts as an inhibitor of the enzyme monoamine oxidase (MAO) and hence is a monoamine oxidase inhibitor (MAOI). [2] More specifically, it is a selective inhibitor of monoamine oxidase B (MAO-B). [2] The drug is thought to work by increasing levels of the monoamine neurotransmitter dopamine in the brain. [2]
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