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• W2004520439 abstract "Abstract: Harman (1-methyl-β-carboline) is an endogenous compound with neurotropic properties in rats and humans. In a novel in vitro binding assay, the binding site of [3H]harman has been characterized in the rat crude mitochondrial (P2) fraction. The binding was saturable and reversible. Only a single high-affinity binding site was detected by kinetic, saturation, and displacement analyses in the cerebral cortex of the rat. The linear Scatchard plots revealed equilibrium dissociation constant (KD) values of ∼2.5 nM at 0°C, ∼9 nM at 23°C, and ∼30 nM at 37°C. Among six CNS regions (hypothalamus, hippocampus, cerebral cortex, striatum, cerebellum, and spinal cord), the highest density of binding sites (Bmax) was determined in the hypothalamus (∼5.5 pmol/mg of protein) and the lowest in the spinal cord (∼2.0 pmol/mg of protein). Several drugs known to affect serotonergic, adrenergic, dopaminergic, cholinergic, or GA-BAergic neurotransmission inhibited specific binding at best in the micromolar range. In contrast, potent and selective inhibitors of monoamine oxidase subtype A were active in the lower and middle nanomolar range. The displacing potency (apparent Ki) of substrates and inhibitors of monoamine oxidase correlated positively and highly significantly with the corresponding values of the inhibition of monoamine oxidase activity of subtype A (r= 0.92, p < 0.001, n = 17) but not of subtype B (r=−0.47, p > 0.05, n = 15). In conclusion, [3H]harman was identified as a specific ligand of the active site of the A subtype of monoamine oxidase in rat brain." @default.
• W2004520439 created "2016-06-24" @default.
• W2004520439 creator A5004881293 @default.
• W2004520439 creator A5063967677 @default.
• W2004520439 creator A5064861777 @default.
• W2004520439 date "1991-02-01" @default.
• W2004520439 modified "2023-09-25" @default.
• W2004520439 title "[³H]Harman Binding Experiments. I: A Reversible and Selective Radioligand for Monoamine Oxidase Subtype A in the CNS of the Rat" @default.
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• W2004520439 doi "https://doi.org/10.1111/j.1471-4159.1991.tb08177.x" @default.
• W2004520439 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/1988552" @default.
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