Selective inhibitors of monoamine oxidase (MAO-A and MAO-B) as probes of its catalytic site and mechanism

1995 ◽  
Vol 15 (4) ◽  
pp. 325-388 ◽  
Author(s):  
Amit S. Kalgutkar ◽  
Neal Castagnoli ◽  
Bernard Testa
Keyword(s):  
Monoamine Oxidase ◽  
Catalytic Site ◽  
Selective Inhibitors ◽  
Mao B ◽  
Mao A

scholarly journals Inhibition of Butyrylcholinesterase and Human Monoamine Oxidase-B by the Coumarin Glycyrol and Liquiritigenin Isolated from Glycyrrhiza uralensis

Molecules ◽  
2020 ◽  
Vol 25 (17) ◽  
pp. 3896
Author(s):  
Geum Seok Jeong ◽  
Myung-Gyun Kang ◽  
Joon Yeop Lee ◽  
Sang Ryong Lee ◽  
Daeui Park ◽  
...  
Keyword(s):  
Monoamine Oxidase ◽  
Binding Affinity ◽  
Competitive Inhibitor ◽  
Glycyrrhiza Uralensis ◽  
Form Hydrogen Bond ◽  
Docking Simulations ◽  
Mao B ◽  
Mao A ◽  
Ic50 Values ◽  
Noncompetitive Inhibitor

Eight compounds were isolated from the roots of Glycyrrhiza uralensis and tested for cholinesterase (ChE) and monoamine oxidase (MAO) inhibitory activities. The coumarin glycyrol (GC) effectively inhibited butyrylcholinesterase (BChE) and acetylcholinesterase (AChE) with IC50 values of 7.22 and 14.77 µM, respectively, and also moderately inhibited MAO-B (29.48 µM). Six of the other seven compounds only weakly inhibited AChE and BChE, whereas liquiritin apioside moderately inhibited AChE (IC50 = 36.68 µM). Liquiritigenin (LG) potently inhibited MAO-B (IC50 = 0.098 µM) and MAO-A (IC50 = 0.27 µM), and liquiritin, a glycoside of LG, weakly inhibited MAO-B (>40 µM). GC was a reversible, noncompetitive inhibitor of BChE with a Ki value of 4.47 µM, and LG was a reversible competitive inhibitor of MAO-B with a Ki value of 0.024 µM. Docking simulations showed that the binding affinity of GC for BChE (−7.8 kcal/mol) was greater than its affinity for AChE (−7.1 kcal/mol), and suggested that GC interacted with BChE at Thr284 and Val288 by hydrogen bonds (distances: 2.42 and 1.92 Å, respectively) beyond the ligand binding site of BChE, but that GC did not form hydrogen bond with AChE. The binding affinity of LG for MAO-B (−8.8 kcal/mol) was greater than its affinity for MAO-A (−7.9 kcal/mol). These findings suggest GC and LG should be considered promising compounds for the treatment of Alzheimer’s disease with multi-targeting activities.

Development of Monoamine Oxidase and Aldehyde Dehydrogenase in Reaggregating Cultures of Fetal Rat Brain Cells

1989 ◽  
Vol 16 (3) ◽  
pp. 281-286
Author(s):  
Olof Tottmar ◽  
Maria Söderbäck ◽  
Anders Aspberg
Keyword(s):  
Monoamine Oxidase ◽  
Rat Brain ◽  
Aldehyde Dehydrogenase ◽  
Brain Cells ◽  
Mao B ◽  
Adult Rat ◽  
Fetal Rat ◽  
Adult Rat Brain ◽  
Mao A ◽  
Fetal Rat Brain

The development of monoamine oxidase (MAO) and aldehyde dehydrogenase (ALDH) in reaggregation cultures of fetal rat brain cells was compared with that of enzymatic markers for glial and neuronal cells. Only MAO-A was detected in the cultures during the first week, but, during the following three weeks, the activity of MAO-B increased more rapidly than that of MAO-A. The ratio MAO-A/MAO-B in four-week aggregates was close to that found in the adult rat brain. The activity of ALDH started to increase rapidly after 15 days, and the developmental pattern was intermediate to those of the glial and neuronal markers. The activity after four weeks was close to that found in the adult rat brain. Epidermal growth factor (EGF) caused a slight decrease in the activities of the low-Km ALDH (after four weeks) and the neuronal marker, choline acetyltransferase (after two weeks), whereas the other markers were not affected. By contrast, the activities of MAO-A and MAO-B were greatly increased during almost the entire culture period. It is suggested that this effect of EGF was the result of increased mitotic activity and/or biochemical differentiation of other cell types present in the cell aggregates, e.g. capillary endothelial cells.

scholarly journals In Vitro,In Vivo, and Clinical Studies of Tedizolid To Assess the Potential for Peripheral or Central Monoamine Oxidase Interactions

2013 ◽  
Vol 57 (7) ◽  
pp. 3060-3066 ◽  
Author(s):  
S. Flanagan ◽  
K. Bartizal ◽  
S. L. Minassian ◽  
E. Fang ◽  
P. Prokocimer
Keyword(s):  
Blood Pressure ◽  
Monoamine Oxidase ◽  
Clinical Research ◽  
Systolic Blood Pressure ◽  
Clinical Studies ◽  
Geometric Mean ◽  
Interaction Study ◽  
Mao B ◽  
Mao A

ABSTRACTTedizolid phosphate is a novel oxazolidinone prodrug whose active moiety, tedizolid, has improved potency against Gram-positive pathogens and pharmacokinetics, allowing once-daily administration. Given linezolid warnings for drug-drug and drug-food interactions mediated by monoamine oxidase (MAO) inhibition, including sporadic serotonergic toxicity, these studies evaluated tedizolid for potential MAO interactions.In vitro, tedizolid and linezolid were reversible inhibitors of human MAO-A and MAO-B; the 50% inhibitory concentration (IC50) for tedizolid was 8.7 μM for MAO-A and 5.7 μM for MAO-B and 46.0 and 2.1 μM, respectively, with linezolid. Tedizolid phosphate was negative in the mouse head twitch model of serotonergic activity. Two randomized placebo-controlled crossover clinical studies assessed the potential of 200 mg/day tedizolid phosphate (at steady state) to enhance pressor responses to coadministered oral tyramine or pseudoephedrine. Sensitivity to tyramine was determined by comparing the concentration of tyramine required to elicit a ≥30-mmHg increase in systolic blood pressure (TYR30) when administered with placebo versus tedizolid phosphate. The geometric mean tyramine sensitivity ratio (placebo TYR30/tedizolid phosphate TYR30) was 1.33; a ratio of ≥2 is considered clinically relevant. In the pseudoephedrine study, mean maximum systolic blood pressure was not significantly different when pseudoephedrine was coadministered with tedizolid phosphate versus placebo. In summary, tedizolid is a weak, reversible inhibitor of MAO-A and MAO-Bin vitro. Provocative testing in humans and animal models failed to uncover significant signals that would suggest potential for hypertensive or serotonergic adverse consequences at the therapeutic dose of tedizolid phosphate. Clinical studies are registered atwww.clinicaltrials.govas NCT01539473 (tyramine interaction study conducted at Covance Clinical Research Center, Evansville, IN) and NCT01577459 (pseudoephedrine interaction study conducted at Vince and Associates Clinical Research, Overland Park, KS).

scholarly journals Computationally Assisted Lead Optimization of Novel Potent and Selective MAO-B Inhibitors

Biomedicines ◽  
2021 ◽  
Vol 9 (10) ◽  
pp. 1304
Author(s):  
Vedanjali Gogineni ◽  
Manal A. Nael ◽  
Narayan D. Chaurasiya ◽  
Khaled M. Elokely ◽  
Christopher R. McCurdy ◽  
...  
Keyword(s):  
Monoamine Oxidase ◽  
Methyl Ether ◽  
Neurological Disorders ◽  
Potential Application ◽  
Selectivity Index ◽  
Lead Optimization ◽  
Mao B ◽  
Reversible Inhibition ◽  
Mao A ◽  
Dietary Flavonoid

A series of dietary flavonoid acacetin 7-O-methyl ether derivatives were computationally designed aiming to improve the selectivity and potency profiles against monoamine oxidase (MAO) B. The designed compounds were evaluated for their potential to inhibit human MAO-A and -B. Compounds 1c, 2c, 3c, and 4c were the most potent with a Ki of 37 to 68 nM against MAO-B. Compounds 1c–4c displayed more than a thousand-fold selectivity index towards MAO-B compared with MAO-A. Moreover, compounds 1c and 2c showed reversible inhibition of MAO-B. These results provide a basis for further studies on the potential application of these modified flavonoids for the treatment of Parkinson’s Disease and other neurological disorders.

scholarly journals Monoamine Oxidase and Semicarbazide-Sensitive Amine Oxidase Kinetic Analysis in Mesenteric Arteries of Patients With Type 2 Diabetes

2011 ◽  
pp. 309-315 ◽  
Author(s):  
S. F. NUNES ◽  
I. V. FIGUEIREDO ◽  
J. S. PEREIRA ◽  
E. T. DE LEMOS ◽  
F. REIS ◽  
...  
Keyword(s):  
Type 2 Diabetes ◽  
Monoamine Oxidase ◽  
Kinetic Parameters ◽  
Amine Oxidase ◽  
Mesenteric Arteries ◽  
Patient Age ◽  
Mao B ◽  
Mao A ◽  
Type 2 Diabetic

Monoamine oxidase (MAO, type A and B) and semicarbazide-sensitive amine oxidase (SSAO) metabolize biogenic amines, however, the impact of these enzymes in arteries from patients with type 2 diabetes remains poorly understood. We investigated the kinetic parameters of the enzymes to establish putative correlations with noradrenaline (NA) content and patient age in human mesenteric arteries from type 2 diabetic patients. The kinetic parameters were evaluated by radiochemical assay and NA content by high-performance liquid chromatography (HPLC). The activity of MAO-A and SSAO in type 2 diabetic vascular tissues was significantly lower compared to the activity obtained in non-diabetic tissues. In the correlation between MAO-A (Km) and NA content, we found a positive correlation for both the diabetic and non-diabetic group, but no correlation was established for patient age. In both groups, MAO-B (Vmax) showed a negative correlation with age. The results show that MAO-A and SSAO activities and NA content of type 2 diabetic tissues are lower compared to the non-diabetic tissues, while MAO-B activity remained unchanged. These remarks suggest that MAO-A and SSAO may play an important role in vascular tissue as well as in the vascular pathophysiology of type 2 diabetes.

scholarly journals Monoamine Oxidase Inhibitory Activity of Biflavonoids from Branches of Garcinia gardneriana (Clusiaceae)

2017 ◽  
Vol 12 (4) ◽  
pp. 1934578X1701200 ◽  
Author(s):  
Maria Angélica Recalde-Gil ◽  
Luiz Carlos Klein-Júnior ◽  
Carolina dos Santos Passos ◽  
Juliana Salton ◽  
Sérgio Augusto de Loreto Bordignon ◽  
...  
Keyword(s):  
Monoamine Oxidase ◽  
Inhibitory Activity ◽  
Ethanol Extract ◽  
Ethyl Acetate Fraction ◽  
Spectrometric Data ◽  
Mao B ◽  
Inhibitory Compounds ◽  
Mao A ◽  
Mao Activity

Garcinia gardneriana is chemically characterized by the presence of biflavonoids. Taking into account that flavonoids are able to inhibit monoamine oxidase (MAO) activity, in the present study, the chemical composition of the branches’ extract of the plant is described for the first time and the MAO inhibitory activity of the isolated biflavonoids was evaluated. Based on spectroscopic and spectrometric data, it was possible to identify volkesiflavone, morelloflavone (1), Gb-2a (2) and Gb-2a-7- O-glucoside (3) in the ethyl acetate fraction from ethanol extract of the branches. Compounds 1-3 were evaluated in vitro and demonstrated the capacity to inhibit MAO-A activity with an IC50 ranging from 5.05 to 10.7 μM, and from 20.7 to 66.2 μM for MAO-B. These inhibitions corroborate with previous IC50 obtained for monomeric flavonoids, with a higher selectivity for MAO-A isoform. The obtained results indicate that biflavonoids might be promising structures for the identification of new MAO inhibitory compounds.

scholarly journals Design, synthesis, molecular modelling and in vitro screening of monoamine oxidase inhibitory activities of novel quinazolyl hydrazine derivatives

2020 ◽  
Vol 7 (4) ◽  
pp. 200050
Author(s):  
Adel Amer ◽  
Abdelrahman H. Hegazi ◽  
Mohammed Khalil Alshekh ◽  
Hany E. A. Ahmed ◽  
Saied M. Soliman ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Monoamine Oxidase ◽  
In Vitro Screening ◽  
Phenyl Substituent ◽  
Design Synthesis ◽  
Mao B ◽  
Mao A ◽  
Ft Ir ◽  
Inhibitory Activities

A new series of N'-substituted benzylidene-2-(4-oxo-2-phenyl-1,4-dihydroquinazolin-3(2H)-yl)acetohydrazide ( 5a–5h ) has been synthesized, characterized by FT-IR, NMR spectroscopy and mass spectrometry and tested against human monoamine oxidase (MAO) A and B. Only (4-hydroxy-3-methoxybenzylidene) substituted compounds gave submicromolar inhibition of MAO-A and MAO-B. Changing the phenyl substituent to methyl on the unsaturated quinazoline ring ( 12a–12d ) decreased inhibition, but a less flexible linker ( 14a–14d ) resulted in selective micromolar inhibition of hMAO-B providing insight for ongoing design.

Are Coumarin Derivatives The New Keys in Depression Treatment? In silico Key-lock Fitting Analysis of Coumarin Derivatives with Monoamine Oxidase-A

2020 ◽  
Vol 7 ◽  
Author(s):  
Dilara Karaman ◽  
Kemal YELEKCI ◽  
Serkan ALTUNTAS
Keyword(s):  
Monoamine Oxidase ◽  
Protein Interactions ◽  
In Silico ◽  
Monoamine Oxidase A ◽  
Coumarin Derivatives ◽  
Discovery Studio ◽  
Mao B ◽  
Drug Candidates ◽  
Mao A ◽  
Molecular Modeling Studies

The research of ligand-protein interactions with in silico molecular modeling studies on the atomic level gives an opportunity to be understood the pharmacokinetic metabolism of anti-depressant drug candidates. Monoamine oxidase (MAO) enzymes are important targets for the treatment of depressive disorder. MAOs have two isoforms as MAO-A and MAO-B being responsible for catalyzing of neurological amines. In this study a new series of coumarin derivatives were designed for selective and reversible inhibition of MAO-A enzyme. 3rd, 5th and 7th positions were selected to be placed of five different side groups. Docking procedures of each ligand in M series of these novel 125 compounds were executed with 10 runs by using AutoDock4.2 software. Docking results were analyzed via Discovery Studio 3.1 (Biovia Inc.). The most promising compounds were M118 and M123 according to selectivity index, SI (MAO-B/MAO-A)=180 fold and 209 fold and Ki values 7.25 nM and 12.01 nM, respectively. Overall, the current study provided significant knowledge for the development of new anti-depressant drugs.

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