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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 dopamine , norepinephrine , and serotonin .
Monoamine oxidase A and B share roughly 70% of their structure and both have substrate binding sites that are predominantly hydrophobic. Two tyrosine residues (398, 435 within MAO-B , 407 and 444 within MAO-A ) in the binding pocket that are commonly involved in inhibitor activity have been hypothesized to be relevant to orienting substrates ...
After release into the synaptic cleft, monoamine neurotransmitter action is ended by reuptake into the presynaptic terminal. There, they can be repackaged into synaptic vesicles or degraded by the enzyme monoamine oxidase (MAO), which is a target of monoamine oxidase inhibitors, a class of antidepressants. [citation needed]
Brunner syndrome is caused by a monoamine oxidase A (MAOA) deficiency, which leads to an excess of monoamines in the brain, such as serotonin, dopamine, and norepinephrine (noradrenaline). In both mice and humans, a mutation was located on the eighth exon of the MAO-A gene, which created a dysfunctional MAO-A gene.
Proponents of the monoamine hypothesis argue that this lag is that the neurotransmitter activity enhancement is the result of auto receptor desensitization, which can take weeks. [59] Intensive investigation has failed to find convincing evidence of a primary dysfunction of a specific monoamine system in people with MDD.
Some studies suggest that the older class of antidepressants, monoamine oxidase inhibitors (MAOIs), may be more effective at treating atypical depression. [25] While the more modern SSRIs and SNRIs are usually quite effective in this illness, the tricyclic antidepressants typically are not. [4]
The last time the Superdome hosted a Super Bowl, the lights went out in the middle of the third quarter, causing a 34-minute delay. This is the story of how it happened.
Taking monoamine oxidase inhibitors (MAOIs) in combination with SSRIs can be fatal, since MAOIs disrupt monoamine oxidase, an enzyme which is needed to break down serotonin and other neurotransmitters. Without monoamine oxidase, the body is unable to eliminate excess neurotransmitters, allowing them to build up to dangerous levels.