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Osmaniye D, Sağlık BN, Levent S, Özkay Y, Kaplancıklı ZA, Turan G. Synthesis of new derivatives containing pyridine, investigation of MAO inhibitory activities and molecular docking studies. Z NATURFORSCH C 2022; 77:509-517. [PMID: 35858184 DOI: 10.1515/znc-2022-0075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Accepted: 06/27/2022] [Indexed: 11/15/2022]
Abstract
In this study, novel pyridine-containing thiazolyl hydrazone derivatives were synthesized. Structure determinations of the compounds were performed using 1H NMR, 13C NMR and HRMS techniques. The biological activities of the compounds were evaluated against MAO enzymes by in vitro fluorometric method. As a result of activity studies, compound 3a showed selective inhibitory activity against MAO-B enzyme with IC50 = 0.088 + 0.003 µM. The selectivity index of this compound is greater than 1136. Molecular docking studies were carried out using 2V5Z crystal. It has been observed that docking studies and activity studies are in harmony.
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Affiliation(s)
- Derya Osmaniye
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Anadolu University, 26470 Eskişehir, Turkey.,Central Analysis Laboratory, Faculty of Pharmacy, Anadolu University, 26470 Eskişehir, Turkey
| | - Begüm Nurpelin Sağlık
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Anadolu University, 26470 Eskişehir, Turkey.,Central Analysis Laboratory, Faculty of Pharmacy, Anadolu University, 26470 Eskişehir, Turkey
| | - Serkan Levent
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Anadolu University, 26470 Eskişehir, Turkey.,Central Analysis Laboratory, Faculty of Pharmacy, Anadolu University, 26470 Eskişehir, Turkey
| | - Yusuf Özkay
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Anadolu University, 26470 Eskişehir, Turkey.,Central Analysis Laboratory, Faculty of Pharmacy, Anadolu University, 26470 Eskişehir, Turkey
| | - Zafer Asım Kaplancıklı
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Anadolu University, 26470 Eskişehir, Turkey
| | - Gülhan Turan
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Anadolu University, 26470 Eskişehir, Turkey
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2
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Turan G, Osmaniye D, Sağlik BN, Çevik UA, Levent S, Çavuşoğlu BK, Özkay ÜD, Özkay Y, Kaplancikli ZA. Synthesis and monoamine oxidase A/B inhibitory evaluation of new benzothiazole-thiazolylhydrazine derivatives. PHOSPHORUS SULFUR 2020. [DOI: 10.1080/10426507.2020.1722667] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Gülhan Turan
- Faculty of Pharmacy, Department of Pharmaceutical Chemistry, Anadolu University, Eskişehir, Turkey
| | - Derya Osmaniye
- Faculty of Pharmacy, Department of Pharmaceutical Chemistry, Anadolu University, Eskişehir, Turkey
- Faculty of Pharmacy, Doping and Narcotic Compounds Analysis Laboratory, Anadolu University, Eskişehir, Turkey
| | - Begüm Nurpelin Sağlik
- Faculty of Pharmacy, Department of Pharmaceutical Chemistry, Anadolu University, Eskişehir, Turkey
- Faculty of Pharmacy, Doping and Narcotic Compounds Analysis Laboratory, Anadolu University, Eskişehir, Turkey
| | - Ulviye Acar Çevik
- Faculty of Pharmacy, Department of Pharmaceutical Chemistry, Anadolu University, Eskişehir, Turkey
- Faculty of Pharmacy, Doping and Narcotic Compounds Analysis Laboratory, Anadolu University, Eskişehir, Turkey
| | - Serkan Levent
- Faculty of Pharmacy, Department of Pharmaceutical Chemistry, Anadolu University, Eskişehir, Turkey
- Faculty of Pharmacy, Doping and Narcotic Compounds Analysis Laboratory, Anadolu University, Eskişehir, Turkey
| | - Betül Kaya Çavuşoğlu
- Faculty of Pharmacy, Department of Pharmaceutical Chemistry, Anadolu University, Eskişehir, Turkey
- Faculty of Pharmacy, Doping and Narcotic Compounds Analysis Laboratory, Anadolu University, Eskişehir, Turkey
| | - Ümide Demir Özkay
- Faculty of Pharmacy, Department of Pharmacology, Anadolu University, Eskişehir, Turkey
| | - Yusuf Özkay
- Faculty of Pharmacy, Department of Pharmaceutical Chemistry, Anadolu University, Eskişehir, Turkey
- Faculty of Pharmacy, Doping and Narcotic Compounds Analysis Laboratory, Anadolu University, Eskişehir, Turkey
| | - Zafer Asım Kaplancikli
- Faculty of Pharmacy, Department of Pharmaceutical Chemistry, Anadolu University, Eskişehir, Turkey
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3
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MacKenzie EM, Song MS, Dursun SM, Tomlinson S, Todd KG, Baker GB. Phenelzine: An Old Drug That May Hold Clues to The Development of New Neuroprotective Agents. ACTA ACUST UNITED AC 2016. [DOI: 10.1080/10177833.2010.11790656] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Erin M. MacKenzie
- Neurochemical Research Unit, Department of Psychiatry, University of Alberta, Edmonton, Alberta, Canada
| | - Mee-Sook Song
- Neurochemical Research Unit, Department of Psychiatry, University of Alberta, Edmonton, Alberta, Canada
| | - Serdar M. Dursun
- Neurochemical Research Unit, Department of Psychiatry, University of Alberta, Edmonton, Alberta, Canada
| | - Sara Tomlinson
- Neurochemical Research Unit, Department of Psychiatry, University of Alberta, Edmonton, Alberta, Canada
| | - Kathryn G. Todd
- Neurochemical Research Unit, Department of Psychiatry, University of Alberta, Edmonton, Alberta, Canada
| | - Glen B. Baker
- Neurochemical Research Unit, Department of Psychiatry, University of Alberta, Edmonton, Alberta, Canada
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Mifflin KA, Benson C, Thorburn KC, Baker GB, Kerr BJ. Manipulation of Neurotransmitter Levels Has Differential Effects on Formalin-Evoked Nociceptive Behavior in Male and Female Mice. THE JOURNAL OF PAIN 2016; 17:483-98. [DOI: 10.1016/j.jpain.2015.12.013] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2015] [Revised: 11/30/2015] [Accepted: 12/14/2015] [Indexed: 01/06/2023]
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Benson CA, Wong G, Tenorio G, Baker GB, Kerr BJ. The MAO inhibitor phenelzine can improve functional outcomes in mice with established clinical signs in experimental autoimmune encephalomyelitis (EAE). Behav Brain Res 2013; 252:302-11. [DOI: 10.1016/j.bbr.2013.06.019] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2013] [Revised: 06/07/2013] [Accepted: 06/11/2013] [Indexed: 12/18/2022]
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Musgrave T, Benson C, Wong G, Browne I, Tenorio G, Rauw G, Baker GB, Kerr BJ. The MAO inhibitor phenelzine improves functional outcomes in mice with experimental autoimmune encephalomyelitis (EAE). Brain Behav Immun 2011; 25:1677-88. [PMID: 21723939 DOI: 10.1016/j.bbi.2011.06.011] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/20/2011] [Revised: 06/13/2011] [Accepted: 06/15/2011] [Indexed: 02/06/2023] Open
Abstract
Multiple sclerosis (MS) and the animal model, experimental autoimmune encephalomyelitis (EAE), are both accompanied by motor and non-motor symptoms. Pathological changes in the activities of key neurotransmitters likely underlie many of these symptoms. We have previously described disturbances in the levels of 5-hydroxytryptamine (5-HT/serotonin), noradrenaline (NE) and γ-aminobutyric acid (GABA) in a mouse model of EAE. The potential therapeutic effect of a drug that targets these three neurotransmitters, the antidepressant and anti-panic drug phenelzine (PLZ), was assessed in mice with MOG(35-55) induced EAE. The neurotransmitter content of EAE and control tissue after PLZ administration was first evaluated by HPLC. The ability of PLZ treatment to modulate EAE disease course and clinical signs was then assessed. Daily PLZ treatment, starting seven days after disease induction, delayed EAE onset, reduced disease severity in the chronic phase and was associated with substantial improvements in exploratory behavior and a novel measure of sickness and/or depression. Upon completion of the experiment, PLZ's effects on histopathological markers of the disease were examined. No differences were observed in T cell infiltration, microglia/macrophage reactivity, demyelination or axonal injury in PLZ-treated spinal cords. However, EAE mice treated with PLZ showed a normalization of 5-HT levels in the ventral horn of the spinal cord that might account for the improvements in behavioral outcomes. These results demonstrate the therapeutic potential of MAO inhibitors such as PLZ in MS. Additionally, the behavioral changes observed in EAE mice indicate that alterations in non-motor or 'affective' measures may be valuable to consider in addition to traditional measures of gross locomotor function.
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Affiliation(s)
- Travis Musgrave
- Centre for Neuroscience, University of Alberta, Edmonton, AB, Canada
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Synthesis and molecular modeling of some novel hexahydroindazole derivatives as potent monoamine oxidase inhibitors. Bioorg Med Chem 2009; 17:6761-72. [DOI: 10.1016/j.bmc.2009.07.033] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2009] [Revised: 07/08/2009] [Accepted: 07/16/2009] [Indexed: 11/18/2022]
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Gökhan-Kelekçi N, Koyunoğlu S, Yabanoğlu S, Yelekçi K, Ozgen O, Uçar G, Erol K, Kendi E, Yeşilada A. New pyrazoline bearing 4(3H)-quinazolinone inhibitors of monoamine oxidase: synthesis, biological evaluation, and structural determinants of MAO-A and MAO-B selectivity. Bioorg Med Chem 2008; 17:675-89. [PMID: 19091581 DOI: 10.1016/j.bmc.2008.11.068] [Citation(s) in RCA: 95] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2008] [Revised: 11/17/2008] [Accepted: 11/21/2008] [Indexed: 10/21/2022]
Abstract
A new series of pyrazoline derivatives were prepared starting from a quinazolinone ring and evaluated for antidepressant, anxiogenic and MAO-A and -B inhibitory activities by in vivo and in vitro tests, respectively. Most of the synthesized compounds showed high activity against both the MAO-A (compounds 4a-4h, 4j-4n, and 5g-5l) and the MAO-B (compounds 4i and 5a-5f) isoforms. However, none of the novel compounds showed antidepressant activity except for 4b. The reason for such biological properties was investigated by computational methods using recently published crystallographic models of MAO-A and MAO-B. The differences in the intermolecular hydrophobic and H-bonding of ligands to the active site of each MAO isoform were correlated to their biological data. Compounds 4i, 4k, 5e, 5i, and 5l were chosen for their ability to reversibly inhibit MAO-B and MAO-A and the availability of experimental inhibition data. Observation of the docked positions of these ligands revealed interactions with many residues previously reported to have an effect on the inhibition of the enzyme. Among the pyrazoline derivatives, it appears that the binding interactions for this class of compounds are mostly hydrophobic. All have potential edge-to-face hydrophobic interactions with F343, as well as pi-pi stacking with Y398 and other hydrophobic interactions with L171. Strong hydrophobic and H-bonding interactions in the MAO recognition of 4i could be the reason why this compound shows selectivity toward the MAO-B isoform. The very high MAO-B selectivity for 4i can be also explained in terms of the distance between the FAD and the compound, which was greater in the complex of MAO-A-4i as compared to the corresponding MAO-B complex.
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Affiliation(s)
- Nesrin Gökhan-Kelekçi
- Hacettepe University, Faculty of Pharmacy, Department of Pharmaceutical Chemistry, 06100 Sihhiye, Ankara, Turkey.
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9
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N-Propynyl analogs of β-phenylethylidenehydrazines: Synthesis and evaluation of effects on glycine, GABA, and monoamine oxidase. Bioorg Med Chem 2008; 16:8254-63. [DOI: 10.1016/j.bmc.2008.07.027] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2008] [Revised: 07/14/2008] [Accepted: 07/14/2008] [Indexed: 11/17/2022]
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MacKenzie EM, Grant SL, Baker GB, Wood PL. Phenelzine causes an increase in brain ornithine that is prevented by prior monoamine oxidase inhibition. Neurochem Res 2007; 33:430-6. [PMID: 17768678 DOI: 10.1007/s11064-007-9448-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2007] [Accepted: 07/17/2007] [Indexed: 11/30/2022]
Abstract
Phenelzine (PLZ), a nonselective irreversible inhibitor of monoamine oxidase (MAO), also inhibits GABA-transaminase (GABA-T), markedly increasing brain GABA levels. PLZ is also a substrate for MAO, and studies suggest that a metabolite formed by the action of this enzyme on PLZ may be responsible for the increase in GABA observed. We have recently found that PLZ also elevates brain ornithine (ORN), an amino acid precursor to both glutamate (and GABA) and the polyamines, and have conducted dose- and time-response studies on this effect. Rats were treated with vehicle or PLZ doses (7.5, 15 or 30 mg/kg i.p.), and brains were collected 3 h later. In the time-response study, animals were treated with vehicle or PLZ (15 mg/kg i.p.) and brains were collected 1-24 h later. To determine whether a metabolite formed by the action of MAO on PLZ may be responsible for the elevation in brain ORN observed, animals were pretreated with vehicle or the MAO inhibitor tranylcypromine (TCP) before vehicle or PLZ (15 mg/kg), and brains collected 3 h later. ORN levels (measured by an HPLC procedure) were dose- and time-dependently increased in PLZ-treated animals, with levels reaching approximately 650% of control at 6 and 12 h. Pretreatment with TCP completely abolished the PLZ-induced increase in brain ORN, suggesting, as with GABA, that a metabolite of PLZ formed by the action of MAO is responsible for the elevation of brain ORN observed. The possible contribution of increased ORN to therapeutic and/or neuroprotective properties of PLZ is discussed.
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Affiliation(s)
- Erin M MacKenzie
- Neurochemical Research Unit, Department of Psychiatry, University of Alberta, 1E7.31 Walter MacKenzie Centre, Edmonton, AB, Canada T6G 2R7
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11
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Parent MB, Master S, Kashlub S, Baker GB. Effects of the antidepressant/antipanic drug phenelzine and its putative metabolite phenylethylidenehydrazine on extracellular gamma-aminobutyric acid levels in the striatum. Biochem Pharmacol 2002; 63:57-64. [PMID: 11754874 DOI: 10.1016/s0006-2952(01)00856-5] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Phenelzine (PLZ) is a non-selective monoamine oxidase inhibitor (MAOI) commonly used to treat depression and panic disorder. As expected, PLZ increases brain levels of dopamine, norepinephrine, and serotonin. Interestingly, PLZ also elevates brain levels of gamma-aminobutyric acid (GABA), and previous studies have suggested that these increases may also contribute to the anxiolytic effects of PLZ. Using in vivo microdialysis in conscious, freely moving rats, combined with high performance liquid chromatography, the present experiments determined that PLZ (15 or 30 mg/kg, free base weight) increases extracellular levels of GABA in the caudate-putamen and nucleus accumbens. The results also indicated that phenylethylidenehydrazine (PEH; 29.6 mg/kg, free base weight), a putative intermediate metabolite of PLZ that is not an MAOI, also significantly increases extracellular GABA levels in the caudate-putamen. These findings provide further evidence that GABA may play an important role in the actions of PLZ and suggest that PEH should be pursued further as a GABAergic drug in its own right.
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Affiliation(s)
- Marise B Parent
- Department of Psychology, University of Alberta, Edmonton, Canada.
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Chen Z, Wu J, Baker GB, Parent M, Dovichi NJ. Application of capillary electrophoresis with laser-induced fluorescence detection to the determination of biogenic amines and amino acids in brain microdialysate and homogenate samples. J Chromatogr A 2001; 914:293-8. [PMID: 11358224 DOI: 10.1016/s0021-9673(01)00539-8] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
A procedure is described to derivatize 16 primary-amine-containing biogenic amines and amino acids in brain mixtures with the fluorogenic reagent 5-furoylquinoline-3-carboxaldehyde (FQ). These FQ-tagged compounds in the brain sample were resolved in less than 16 min based on micellar electrokinetic chromatography and laser-induced fluorescence. There was a linear relationship between the concentration of analyte and the fluorescence intensity, with correlation coefficients in the range of 0.96-1.00. The utility of this method for the quantification of the important inhibitory neurotransmitter gamma-aminobutyric acid in microdialysates and brain homogenates from rats is illustrated.
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Affiliation(s)
- Z Chen
- Department of Chemistry, University of Alberta, Edmonton, Canada
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Paslawski T, Knaus E, Iqbal N, Coutts R, Baker G. ?-phenylethylidenehydrazine, a novel inhibitor of GABA transaminase. Drug Dev Res 2001. [DOI: 10.1002/ddr.1202] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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Parent MB, Habib MK, Baker GB. Time-dependent changes in brain monoamine oxidase activity and in brain levels of monoamines and amino acids following acute administration of the antidepressant/antipanic drug phenelzine. Biochem Pharmacol 2000; 59:1253-63. [PMID: 10736426 DOI: 10.1016/s0006-2952(00)00244-6] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Phenelzine (PLZ) is a non-selective monoamine oxidase (MAO) inhibitor commonly used to treat depression and panic disorder. Acute administration of PLZ produces several neurochemical changes, including an increase in brain levels of the catecholamines norepinephrine (NE) and dopamine (DA), of 5-hydroxytryptamine (5-HT), and of the amino acids alanine and gamma-aminobutyric acid (GABA). The goal of the present series of experiments was to characterize the time course of these PLZ-induced changes. Male Sprague-Dawley rats were sacrificed 6, 24, 48, 96, 168, or 336 hr after acute PLZ administration (15 or 30 mg/kg, i.p., based on free base weight). Whole brain levels of monoamines and amino acids were determined using HPLC, and MAO A and B activities were determined using a radiochemical procedure. The results indicated that PLZ changed amino acid levels 6 and 24 hr after injection, but not 48 hr later. In contrast, the effects of PLZ on MAO activity and monoamines were longer-lasting. For example, PLZ-induced increases in dopamine and 5-HT were observed 1 week after injection, and PLZ-induced inhibition of MAO activity persisted for 2 weeks. Thus, in addition to demonstrating that the effects of PLZ on MAO activity and monoamines were long-lasting, these results indicate that the effects of PLZ on MAO activity and on brain levels of monoamines and amino acids are temporally dissociated. These findings regarding the long-term effects of PLZ on neurochemistry will have considerable critical implications for the design and interpretation of behavioral studies of the acute effects of PLZ.
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Affiliation(s)
- M B Parent
- Department of Psychology, University of Alberta, Edmonton, Alberta, Canada.
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15
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Abstract
1. The principal routes of metabolism of the following monoamine oxidase inhibitors (MAOIs) are described: phenelzine, tranylcypromine, pargyline, deprenyl, moclobemide, and brofaromine. 2. Acetylation of phenelzine appears to be a minor metabolic pathway. Phenelzine is a substrate as well as an inhibitor of MAO, and major identified metabolites of phenelzine include phenylacetic acid and p-hydroxyphenylacetic acid. Phenelzine also elevates brain GABA levels, and as yet unidentified metabolites of phenelzine may be responsible for this effect. beta-Phenylethylamine is a metabolite of phenelzine, and there is indirect evidence that phenelzine may also be ring-hydroxylated and N-methylated. 3. Tranylcypromine is ring-hydroxylated and N-acetylated. There is considerable debate about whether or not it is metabolized to amphetamine, with most of studies in the literature indicating that this does not occur. 4. Pargyline and R(-)-deprenyl, both propargylamines, are N-demethylated and N-depropargylated to yield arylalkylamines (benzylamine, N-methylbenzylamine, and N-propargylbenzylamine in the case of pargyline and amphetamine, N-methylamphetamine and N-propargylamphetamine in the case of deprenyl). These metabolites may then undergo further metabolism, e.g., hydroxylation. 5. Moclobemide is biotransformed by C- and N-oxidation on the morpholine ring and by aromatic hydroxylation. An active metabolite of brofaromine is formed by O-demethylation. It has been proposed that another as yet unidentified active metabolite may also be formed in vivo. 6. Preliminary results indicate that several of the MAOIs mentioned above are substrates and/or inhibitors of various cytochrome P450 (CYP) enzymes, which may result in pharmacokinetic interactions with some coadministered drugs.
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Affiliation(s)
- G B Baker
- Department of Psychiatry, University of Alberta, Edmonton, Canada
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Paslawski T, Treit D, Baker GB, George M, Coutts RT. The antidepressant drug phenelzine produces antianxiety effects in the plus-maze and increases in rat brain GABA. Psychopharmacology (Berl) 1996; 127:19-24. [PMID: 8880939 DOI: 10.1007/bf02805970] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Research on the effects of antidepressant/ antipanic drugs in animal models of anxiety has yielded equivocal results, even after chronic drug regimens. In contrast, we found that the antidepressant/antipanic drug phenelzine, given acutely, produced a clear anxiolytic effect in the elevated plus-maze, a widely-used animal model of "anxiety" that is primarily sensitive to benzodiazepine-type anxiolytics (e.g., diazepam). Furthermore, the effective dose of phenelzine (15 mg/kg) administered to rats was associated with more than a 2- fold increase in whole brain levels of gamma-aminobutyric acid (GABA), whereas an ineffective dose of phenelzine (5.1 mg/kg) did not significantly change GABA levels. The N-acetylated metabolite of phenelzine, N2-acetylphenelzine, produced neither an anxiolytic effect in the elevated plus-maze nor a significant change in whole-brain levels of GABA. However, both phenelzine and N2-acetylphenelzine potently inhibited monoamine oxidase, a mechanism commonly thought to be involved in the therapeutic effects of monoamine oxidase inhibitors such as phenelzine in the treatment of depression in humans. These results suggest that the mechanism whereby phenelzine produces anxiolytic effects in the plus-maze model is unique to a facilitatory action on brain levels of GABA, in contrast to classical benzodiazepines, which produce anxiolytic effects by enhancing the affinity of the GABAA-receptor for GABA.
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Affiliation(s)
- T Paslawski
- Department of Psychiatry, University of Alberta, Edmonton, Canada
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17
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Todd KG, Baker GB. GABA-elevating effects of the antidepressant/antipanic drug phenelzine in brain: effects of pretreatment with tranylcypromine, (-)-deprenyl and clorgyline. J Affect Disord 1995; 35:125-9. [PMID: 8749840 DOI: 10.1016/0165-0327(95)00056-9] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The antidepressant/antipanic drug phenelzine (PLZ) is both an inhibitor of, and a substrate for, monoamine oxidase (MAO). PLZ also causes an elevation of brain levels of the amino acid neurotransmitter gamma-aminobutyric acid (GABA); this action can be reversed by pretreatment with the MAO inhibitor tranylcypromine (TCP), suggesting that the GABA-elevating effect is largely the result of a metabolite of PLZ formed by MAO. In the present report, rats were pretreated with the nonselective MAO inhibitor TCP, the MAO-A inhibitor clorgyline and the MAO-B inhibitor (-)-deprenyl: at the doses used, clorgyline and (-)-deprenyl caused selective inhibition of MAO-A and MAO-B, respectively. Both TCP and (-)-deprenyl caused a greater reduction in the GABA-elevating action of PLZ than did clorgyline, suggesting that MAO-B is more important than MAO-A in the formation of the active metabolite of PLZ. The results also suggest that an effect other than, or in addition to, inhibition of GABA transaminase by the metabolite may be important in the GABA-elevating action.
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Affiliation(s)
- K G Todd
- Department of Psychiatry, University of Alberta, Mackenzie Health Sciences Centre, Edmonton, Canada
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18
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Raciti G, Mazzone P, Raudino A, Mazzone G, Cambria A. Inhibition of rat liver mitochondrial monoamine oxidase by hydrazine-thiazole derivatives: structure-activity relationships. Bioorg Med Chem 1995; 3:1485-91. [PMID: 8634828 DOI: 10.1016/0968-0896(95)00137-6] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
The purpose of this research is to study the relationship between chemical structure and inhibitory activity of some hydrazine-thiazole derivatives on rat liver mitochondria monoamine oxidase (MAO). Forty-five compounds belonging to three series of hydrazine-thiazole derivatives, with either alkylic or arylic substituents in the thiazole ring, were tested. The highest inhibitory activity was observed with piperonyl derivatives 25 and 40, which contain a 4-methyl group in the thiazole nucleus. The structure-activity relationship of MAO inhibitors was established in relation to hydrophobic, electronic and steric hindrance parameters. A mechanism of enzyme inhibition was proposed based on the calculation of HOMO energies.
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Affiliation(s)
- G Raciti
- Istituto di Scienze Biochimiche e Farmacologiche, Universita' di Catania, Italy
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19
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Paslawski TM, Sloley BD, Baker GB. Effects of the MAO inhibitor phenelzine on glutamine and GABA concentrations in rat brain. PROGRESS IN BRAIN RESEARCH 1995; 106:181-6. [PMID: 8584653 DOI: 10.1016/s0079-6123(08)61214-5] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Phenelzine (PLZ), a frequently prescribed monoamine oxidase (MAO) inhibitor, is used as an antidepressant/antipanic drug and has been shown to cause marked increases in rat brain levels of the amino acids gamma-aminobutyric acid (GABA) and alanine. In an extension of previous studies related to GABA metabolism, we investigated the effects of PLZ on rat brain levels of glutamine (GLN). At 1, 3 or 6 h after injection of PLZ (15 mg kg-1 i.p.), rats were killed and the brains removed. Analyses (using HPLC with fluorescence detection of OPT derivatives) of whole brain or hypothalamus revealed a decrease in brain levels of GLN and an increase in GABA levels at 3 and 6 h after PLZ injection. The effects of PLZ on GLN and GABA were blocked by prior treatment of the rats with tranylcypromine, a MAO inhibitor that had been shown previously to have no direct effect itself on GABA levels in rat brain. Since PLZ is known to be a substrate (as well as an inhibitor) of MAO, the studies with tranylcypromine pretreatment suggest that the effects on GLN and GABA are caused, at least in part, by a metabolite of PLZ.
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Affiliation(s)
- T M Paslawski
- Department of Psychiatry, University of Alberta, Edmonton, Canada
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Sherry-McKenna RL, Wong JT, Paetsch PR, Baker GB, Mousseau DD, McKenna KF, Coutts RT, Greenshaw AJ. Monoamine oxidase inhibitors: effects on tryptophan concentrations in rat brain. JOURNAL OF NEURAL TRANSMISSION. SUPPLEMENTUM 1994; 41:155-163. [PMID: 7931222 DOI: 10.1007/978-3-7091-9324-2_22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
It has been suggested that inhibition of tryptophan (Trp) pyrrolase and a subsequent elevation of brain Trp may contribute to the actions of antidepressant drugs. In our laboratories, we have conducted a series of experiments measuring brain Trp levels in the rat after both acute and chronic administration of several monoamine oxidase (MAO) inhibitors. The drugs studied during the course of the long-term (28 day) experiments were phenelzine, N2-acetylphenelzine, tranylcypromine, 4-fluorotranylcypromine, 4-methoxytranylcypromine and (-)-deprenyl. High-pressure liquid chromatography with electrochemical detection was employed to measure Trp levels in brains of both MAO inhibitor- and vehicle-treated animals. No significant increases in brain Trp levels were observed as a consequence of MAO inhibitor treatment. Acute time-response (up to 24 h) and dose-response studies were conducted following the administration of phenelzine and tranylcypromine. Only after administration of high doses of these drugs was an elevation in brain Trp observed and the increase was relatively short-lived. These results suggest that elevation of brain Trp may be an important factor in the actions of MAO inhibitors only at high doses of these drugs.
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McKenna KF, McManus DJ, Baker GB, Coutts RT. Chronic administration of the antidepressant phenelzine and its N-acetyl analogue: effects on GABAergic function. JOURNAL OF NEURAL TRANSMISSION. SUPPLEMENTUM 1994; 41:115-22. [PMID: 7931216 DOI: 10.1007/978-3-7091-9324-2_15] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The MAO inhibitor phenelzine (2-phenylethylhydrazine; PLZ) is used widely in psychiatry for the treatment of depression and panic disorder. Its N-acetyl metabolite, N2-acetylphenelzine (N2AcPLZ) is a reasonably potent nonselective inhibitor of monoamine oxidase (MAO) that causes elevation in brain levels of the biogenic amines. In the studies reported here, PLZ (0.05 mmol/kg/day), N2AcPLZ (0.10 mmol/kg/day) or vehicle were administered to male rats for 28 days s.c. with Alzet minipumps, and their effects on GABAergic function were examined. Whole brain concentrations of gamma-aminobutyric acid (GABA) were significantly elevated in the PLZ but not in the N2AcPLZ-treated group. PLZ was found to inhibit the anabolic enzyme glutamic acid decarboxylase (GAD) and, to a greater extent, the catabolic enzyme GABA transaminase (GABA-T). The results of these investigations suggest that the free hydrazine moiety in PLZ is crucial to producing the elevated levels of GABA, probably through inhibition of GABA-T. Despite the considerable increase in whole brain GABA levels in the PLZ-treated rats, there were no significant differences in GABAA or benzodiazepine receptor binding parameters (KD or Bmax) between the groups as measured using 3H-muscimol and 3H-flunitrazepam in radioligand binding assays.
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Affiliation(s)
- K F McKenna
- Department of Psychiatry, University of Alberta, Edmonton, Canada
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