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Herraiz T. β-Carboline Alkaloids in Soy Sauce and Inhibition of Monoamine Oxidase (MAO). Molecules 2023; 28:molecules28062723. [PMID: 36985694 PMCID: PMC10053526 DOI: 10.3390/molecules28062723] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2022] [Revised: 03/13/2023] [Accepted: 03/14/2023] [Indexed: 03/30/2023] Open
Abstract
Monoamine oxidase (MAO) oxidizes neurotransmitters and xenobiotic amines, including vasopressor and neurotoxic amines such as the MPTP neurotoxin. Its inhibitors are useful as antidepressants and neuroprotectants. This work shows that diluted soy sauce (1/3) and soy sauce extracts inhibited human MAO-A and -B isozymes in vitro, which were measured with a chromatographic assay to avoid interferences, and it suggests the presence of MAO inhibitors. Chromatographic and spectrometric studies showed the occurrence of the β-carboline alkaloids harman and norharman in soy sauce extracts inhibiting MAO-A. Harman was isolated from soy sauce, and it was a potent and competitive inhibitor of MAO-A (0.4 µM, 44 % inhibition). The concentrations of harman and norharman were determined in commercial soy sauces, reaching 243 and 52 μg/L, respectively. Subsequently, the alkaloids 1,2,3,4-tetrahydro-β-carboline-3-carboxylic acid (THCA) and 1-methyl-1,2,3,4-tetrahydro-β-carboline-3-carboxylic acid (MTCA) were identified and analyzed in soy sauces reaching concentrations of 69 and 448 mg/L, respectively. The results show that MTCA was a precursor of harman under oxidative and heating conditions, and soy sauces increased the amount of harman under those conditions. This work shows that soy sauce contains bioactive β-carbolines and constitutes a dietary source of MAO-A and -B inhibitors.
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Affiliation(s)
- Tomás Herraiz
- Instituto de Ciencia y Tecnología de Alimentos y Nutrición (ICTAN), Spanish National Research Council (CSIC), José Antonio Nováis 6, Ciudad Universitaria, 28040 Madrid, Spain
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Oña G, Bouso JC. Therapeutic Potential of Natural Psychoactive Drugs for Central Nervous System Disorders: A Perspective from Polypharmacology. Curr Med Chem 2021; 28:53-68. [PMID: 31830883 DOI: 10.2174/0929867326666191212103330] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2019] [Revised: 10/01/2019] [Accepted: 10/02/2019] [Indexed: 11/22/2022]
Abstract
In the drug development, the formation of highly selective ligands has been unsuccessful in the treatment of central nervous system disorders. Multi-target ligands, from the polypharmacology paradigm, are being proposed as treatments for these complex disorders, since they offer enhanced efficacy and a strong safety profile. Natural products are the best examples of multi-target compounds, so they are of high interest within this paradigm. Additionally, recent research on psychoactive drugs of natural origin, such as ayahuasca and cannabis, has demonstrated the promising therapeutic potential for the treatment of some psychiatric and neurological disorders. In this text, we describe how research on psychoactive drugs can be effectively combined with the polypharmacology paradigm, providing ayahuasca and cannabis research as examples. The advantages and disadvantages are also discussed.
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Affiliation(s)
- Genís Oña
- International Center for Ethnobotanical Education, Research and Service (ICEERS), Barcelona, Spain
| | - José Carlos Bouso
- International Center for Ethnobotanical Education, Research and Service (ICEERS), Barcelona, Spain
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Farag MA, Hegazi NM, Donia MS. Molecular networking based LC/MS reveals novel biotransformation products of green coffee by ex vivo cultures of the human gut microbiome. Metabolomics 2020; 16:86. [PMID: 32748036 DOI: 10.1007/s11306-020-01704-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/18/2020] [Accepted: 07/16/2020] [Indexed: 02/06/2023]
Abstract
INTRODUCTION Unroasted green coffee bean is an increasingly popular beverage and weight loss supplement that contains higher levels of chlorogenic acid derivatives and lower alkaloid levels than roasted beans. Nonetheless, how the gut microbiome metabolizes green coffee constituents has not been studied. OBJECTIVES To identify possible biotransformation products of green coffee extract by the human gut microbiome, and the potential implications of this process on its biological effects or fate inside the body. METHODS Molecular networking via the GNPS platform was employed for the visualization of green coffee metabolite profiles acquired using LC-tandem mass spectrometry post-incubation with an ex vivo culture of the human gut microbiome. RESULTS 36 Metabolites were annotated including four unreported alkyl cinnamate esters in green coffee along with six novel biotransformation products. CONCLUSION Our finding reveals new biotransformation products of cinnamate esters by the gut microbiome mediated via oxidative reactions such as dehydrogenation and hydroxylation, along with methylation, decarboxylation, and deglycosylation. These findings reveal potential interactions between the gut microbiome and green coffee constituents, and paves the way towards studying the effects of these interactions on both microbiome and the human host.
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Affiliation(s)
- Mohamed A Farag
- Pharmacognosy Department, College of Pharmacy, Cairo University, Kasr el Aini st., P.B. 11562, Cairo, Egypt.
- Department of Chemistry, School of Sciences and Engineering, American University in Cairo, New Cairo, 11835, Egypt.
| | - Nesrine M Hegazi
- Department of Phytochemistry and Plant Systematics, Division of Pharmaceutical Industries, National Research Centre, Cairo, 12622, Egypt
| | - Mohamed S Donia
- Department of Molecular Biology, Princeton University, Princeton, NJ, 08544, USA
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López-González D, Costas-Gil A, Reigosa MJ, Araniti F, Sánchez-Moreiras AM. A natural indole alkaloid, norharmane, affects PIN expression patterns and compromises root growth in Arabidopsis thaliana. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2020; 151:378-390. [PMID: 32278957 DOI: 10.1016/j.plaphy.2020.03.047] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2020] [Accepted: 03/28/2020] [Indexed: 06/11/2023]
Abstract
Norharmane is an indole alkaloid that can be found in several terrestrial plants, as well as in some dinoflagellates and cyanobacteria. The aim of this study was to focus on the way this metabolite impacts the plant metabolism of the model species Arabidopsis thaliana. This metabolite caused increase of secondary and adventitious roots, as well as torsion, toxic effects, and a decrease in root length. Moreover, norharmane altered the cellular arrangement, resulting in unfinished cell walls, decreased auxin content and inhibited PIN proteins activity. All the alterations suggest that norharmane alters polar auxin transport by inhibiting PIN2, PIN3 and PIN7 transport proteins, thus causing a significant inhibitory effect on the growth of A. thaliana seedlings.
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Affiliation(s)
- David López-González
- Department of Plant Biology and Soil Science, Faculty of Biology, University of Vigo, Campus Lagoas-Marcosende s/n, 36310, Vigo, Spain; CITACA, Agri-Food Research and Transfer Cluster, Campus da Auga, University of Vigo, Ourense, Spain.
| | - Aitana Costas-Gil
- Department of Plant Biology and Soil Science, Faculty of Biology, University of Vigo, Campus Lagoas-Marcosende s/n, 36310, Vigo, Spain; CITACA, Agri-Food Research and Transfer Cluster, Campus da Auga, University of Vigo, Ourense, Spain.
| | - Manuel J Reigosa
- Department of Plant Biology and Soil Science, Faculty of Biology, University of Vigo, Campus Lagoas-Marcosende s/n, 36310, Vigo, Spain; CITACA, Agri-Food Research and Transfer Cluster, Campus da Auga, University of Vigo, Ourense, Spain.
| | - Fabrizio Araniti
- Department of Plant Biology and Soil Science, Faculty of Biology, University of Vigo, Campus Lagoas-Marcosende s/n, 36310, Vigo, Spain; Dipartimento di AGRARIA, Università Mediterranea di Reggio Calabria, Feo di Vito, I-89124, Reggio Calabria, Italy.
| | - Adela M Sánchez-Moreiras
- Department of Plant Biology and Soil Science, Faculty of Biology, University of Vigo, Campus Lagoas-Marcosende s/n, 36310, Vigo, Spain; CITACA, Agri-Food Research and Transfer Cluster, Campus da Auga, University of Vigo, Ourense, Spain.
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Wang X, Zhan E, Lu G, Mu Q, Zhang T, Yang N. Sphingosine-1-Phosphate Improves the Biological Features of Mouse Bone Marrow-Derived EPCs Partially through PI3K/AKT/eNOS/NO Pathway. Molecules 2019; 24:molecules24132404. [PMID: 31261859 PMCID: PMC6651153 DOI: 10.3390/molecules24132404] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2019] [Revised: 06/20/2019] [Accepted: 06/28/2019] [Indexed: 01/31/2023] Open
Abstract
Sphingosine-1-phosphate (S1P), a bioactive sphingolipid, is recognized as a critical regulator in physiological and pathophysiological processes of atherosclerosis (AS). However, the underlying mechanism remains unclear. As the precursor cells of endothelial cells (ECs), endothelial progenitor cells (EPCs) can prevent AS development through repairing endothelial monolayer impaired by proatherogenic factors. The present study investigated the effects of S1P on the biological features of mouse bone marrow-derived EPCs and the underlying mechanism. The results showed that S1P improved cell viability, adhesion, and nitric oxide (NO) release of EPCs in a bell-shaped manner, and migration and tube formation dose-dependently. The aforementioned beneficial effects of S1P on EPCs could be inhibited by the phosphatidylinositol 3-kinase (PI3K) inhibitor of LY294002 and nitric oxide synthase (NOS) inhibitor of N’-nitro-L-arginine-methyl ester hydrochloride (L-NAME). The inhibitor of LY294002 inhibited S1P-stimulated activation of phosphorylated protein kinase B (AKT) (p-AKT) and endothelial nitric oxide synthase (eNOS) (p-eNOS), and down-regulated the level of eNOS significantly. The results suggest that S1P improves the biological features of EPCs partially through PI3K/AKT/eNOS/NO signaling pathway.
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Affiliation(s)
- Xia Wang
- School of Public Health and Management, Weifang Medical University, Weifang 261053, China
- Collaborative Innovation Center of Prediction and Governance of Major Social Risks in Shandong, Weifang Medical University, Weifang 261053, China
| | - Enxin Zhan
- Institute of Preschool Education, Jinan Preschool Education College, Jinan 250307, China
| | - Guohua Lu
- Department of Psychology, Weifang Medical University, Weifang 261053, China
| | - Qingjie Mu
- School of Clinical Medicine, Weifang Medical University, Weifang 261053, China
| | - Tianliang Zhang
- Experimental Center for Medical Research, Weifang Medical University, Weifang 261053, China.
| | - Nana Yang
- Experimental Center for Medical Research, Weifang Medical University, Weifang 261053, China.
- School of Bioscience and Technology, Weifang Medical University, Weifang 261053, China.
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Wagner DJ, Duan H, Chapron A, Lee RW, Wang J. Potent inhibition of human organic cation transporter 2 (hOCT2) by β-carboline alkaloids. Xenobiotica 2017; 47:1112-1120. [PMID: 27977936 PMCID: PMC5648609 DOI: 10.1080/00498254.2016.1271160] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2016] [Accepted: 12/07/2016] [Indexed: 02/08/2023]
Abstract
1. Beta-carbolines are indole alkaloids with a wide range of pharmacological and toxicological activities. Beta-carbolines are structurally related to the neurotoxin 1-methyl-4-phenylpyridinium (MPP+), a known substrate of organic cation transporters (OCTs). The goal of this study is to determine the interaction of β-carbolines with human OCT1, 2, and 3 (SLC22A1-3). 2. Dose-dependent inhibition studies were performed for five commercially available β-carbolines using a fluorescent substrate assay in HEK293 cells stably expressing hOCT1-3. The substrate potential was evaluated by uptake assays and the impact of active transport on cellular toxicity examined. 3. All tested β-carbolines potently inhibited hOCT2 with IC50 values in the sub- or low micromolar range. Harmaline is the most potent hOCT2 inhibitor (IC50 = 0.50 ± 0.08 μM). hOCT1 and hOCT3 are less sensitive to β-carboline inhibition. Harmaline, norharmanium, and 2,9-dimethyl-4,9-dihydro-3H-β-carbolinium accumulated 2- to 7-fold higher in cells expressing hOCT1-3. HEK293 cells expressing hOCT1-3 were 6.5- to 13-fold more sensitive to harmane and norharmanium toxicity. 4. Our data support a significant role of hOCT1-3 in tissue uptake and disposition of β-carbolines. Importantly, the potent inhibition of hOCT2 by β-carbolines also raises the concern of potential drug interactions between naturally occurring bioactive alkaloids and drugs eliminated by hOCT2.
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Affiliation(s)
- David J. Wagner
- Department of Pharmaceutics, University of Washington, Seattle, WA, USA
| | - Haichuan Duan
- Department of Pharmaceutics, University of Washington, Seattle, WA, USA
| | - Alenka Chapron
- Department of Pharmaceutics, University of Washington, Seattle, WA, USA
| | - Richard W. Lee
- School of Pharmacy, University of Washington, Seattle, WA, USA
| | - Joanne Wang
- Department of Pharmaceutics, University of Washington, Seattle, WA, USA
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Karan T, Erenler R. Screening of Norharmane from Seven Cyanobacteria by High-performance Liquid Chromatography. Pharmacogn Mag 2017; 13:S723-S725. [PMID: 29142439 PMCID: PMC5669122 DOI: 10.4103/pm.pm_214_17] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Revised: 06/21/2017] [Indexed: 11/04/2022] Open
Abstract
Background Cyanobacteria, including pharmaceutically and medicinally valuable compounds attract the great attention lately. Norharmane (9H-pyrido (3,4-b) indole found in some cyanobacteria revealed a great number of biological effects. Objective Seven cyanobacteria were isolated and identified from Yesilirmak River and Gaziosmanpasa University Campus to determine the norharmane content. Materials and Methods Cyanobacteria collected from Tokat, Turkey were isolated and identified by morphologically. Norharmane (9H-pyrido [3,4-b] indole) quantities were presented for seven cyanobacteria, Chroococcus minutus (Kütz.) Nägeli, Geitlerinema carotinosum (Geitler) Anagnostidis, Nostoc linckia Bornet ex Bornet and Flahault, Anabaena oryzae F. E. Fritsch, Oscillatoria limnetica Lemmermann, Phormidium sp. Kützing ex Gomont, and Cylindrospermum sp. Kutzing ex E. Bornet and C. Flahault by high-performance liquid chromatography. Results The norharmane amount indicated for cyanobacterial culture media altered in a species-dependent kind in the range of 0.81-10.87 μg/g. C. minutus produced the most norharmane among the investigated cyanobacteria as 10.87 μg/g. Conclusion Cyanobacteria could be an important source of norharmane as well as pharmaceutically valuable compounds. SUMMARY Seven cyanobacteria were isolated and identified from Yesilirmak RiverQuantitative analysis of norharmane was executed on isolated cyanobacteriaFour cyanobecteria species included the norharmaneChroococcus minutus contained the most norharmane (10.87 μg/g). Abbreviations used: HPLC: High performance liquid chromatograph.
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Affiliation(s)
- Tunay Karan
- Department of Molecular Biology and Genetics, Faculty of Arts and Sciences, Gaziosmanpasa University, Tokat, Turkey
| | - Ramazan Erenler
- Department of Chemistry, Faculty of Arts and Sciences, Gaziosmanpasa University, Tokat, Turkey
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Herraiz T. N-methyltetrahydropyridines and pyridinium cations as toxins and comparison with naturally-occurring alkaloids. Food Chem Toxicol 2016; 97:23-39. [DOI: 10.1016/j.fct.2016.08.009] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2016] [Revised: 07/22/2016] [Accepted: 08/05/2016] [Indexed: 02/06/2023]
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Abu Ghazaleh H, Lalies MD, Nutt DJ, Hudson AL. Harmane: An atypical neurotransmitter? Neurosci Lett 2015; 590:1-5. [DOI: 10.1016/j.neulet.2015.01.057] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2014] [Revised: 01/15/2015] [Accepted: 01/22/2015] [Indexed: 12/14/2022]
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10
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Hydroxyl radical reactions and the radical scavenging activity of β-carboline alkaloids. Food Chem 2014; 172:640-9. [PMID: 25442601 DOI: 10.1016/j.foodchem.2014.09.091] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2014] [Revised: 08/02/2014] [Accepted: 09/16/2014] [Indexed: 11/23/2022]
Abstract
β-Carbolines are bioactive pyridoindole alkaloids occurring in foods, plants and the human body. Their activity as hydroxyl radical (OH) scavengers is reported here by using three different methods: deoxyribose degradation, hydroxylation of benzoate and hydroxylation of 2'-deoxyguanosine to give 8-hydroxy-2'-deoxyguanosine (8-OHdG) as assessed by RP-HPLC (MS). Fenton reactions (Fe(2+)/Fe(3+) plus H2O2) were used for OH generation, and the radical increased in the presence of ascorbic acid or 6-hydroxydopamine as pro-oxidants. β-Carbolines were scavengers of OH in the three assays and in the presence of pro-oxidants. Tetrahydro-β-carboline-3-carboxylic acids were active against the hydroxylation of 2'-deoxyguanosine. β-Carbolines reacted with hydroxyl radicals (OH) affording hydroxy-β-carbolines, whereas tetrahydro-β-carbolines gave oxidative and degradation products. On the basis of IC50 and reaction rates (k), β-carbolines (norharman and harman), and tetrahydro-β-carbolines (tetrahydro-β-carboline, 1-methyltetrahydro-β-carboline and pinoline) were good OH radical scavengers and their activity was comparable to that of the indole, melatonin, which is an effective hydroxyl radical scavenger and antioxidant.
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Key Words
- 1,2,3,4-Tetrahydro-beta-carboline (PubChem CID: 107838)
- 1,2,3,4-Tetrahydro-beta-carboline-3-carboxylic acid (PubChem CID: 98285)
- 1-Methyl-1,2,3,4-tetrahydro-beta-carboline (PubChem CID: 91522)
- 1-Methyl-1,2,3,4-tetrahydro-beta-carboline-3-carboxylic acid (PubChem CID: 73530)
- 6-Hydroxydopamine (PubChem CID: 4624)
- 8-Hydroxy-2′-deoxyguanosine
- Antioxidants
- Ascorbic acid (PubChem CID: 54678501)
- Benzoate
- Deoxyribose
- Harman (PubChem CID: 5281404)
- Hydroxyl radical scavengers
- Indoles
- Melatonin
- Melatonin (PubChem CID: 896)
- Norharman (PubChem CID: 64961)
- Pinoline (PubChem CID: 1868)
- Pyridoindoles
- Tetrahydro-β-carbolines
- β-Carboline alkaloids
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Herraiz T, Galisteo J. Naturally-occurring tetrahydro-β-carboline alkaloids derived from tryptophan are oxidized to bioactive β-carboline alkaloids by heme peroxidases. Biochem Biophys Res Commun 2014; 451:42-7. [PMID: 25035927 DOI: 10.1016/j.bbrc.2014.07.047] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2014] [Accepted: 07/09/2014] [Indexed: 12/13/2022]
Abstract
β-Carbolines are indole alkaloids that occur in plants, foods, and endogenously in mammals and humans, and which exhibit potent biological, psychopharmacological and toxicological activities. They form from naturally-occurring tetrahydro-β-carboline alkaloids arising from tryptophan by still unknown way and mechanism. Results in this research show that heme peroxidases catalyzed the oxidation of tetrahydro-β-carbolines (i.e. 1,2,3,4-tetrahydro-β-carboline-3-carboxylic acid and 1-methyl-1,2,3,4-tetrahydro-β-carboline-3-carboxylic acid) into aromatic β-carbolines (i.e. norharman and harman, respectively). This oxidation followed a typical catalytic cycle of peroxidases through redox intermediates I, II, and ferric enzyme. Both, plant peroxidases (horseradish peroxidase, HRP) and mammalian peroxidases (myeloperoxidase, MPO and lactoperoxidase, LPO) catalyzed the oxidation in an efficient manner as determined by kinetic parameters (VMAX and KM). Oxidation of tetrahydro-β-carbolines was inhibited by peroxidase inhibitors such as sodium azide, ascorbic acid, hydroxylamine and excess of H2O2. The formation of aromatic β-carbolines by heme peroxidases can help to explain the presence and activity of these compounds in biological systems.
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Affiliation(s)
- Tomás Herraiz
- Instituto de Ciencia y Tecnología de Alimentos y Nutrición (ICTAN-CSIC), Spanish National Research Council (CSIC), Juan de la Cierva 3, 28006 Madrid, Spain.
| | - Juan Galisteo
- Instituto de Ciencia y Tecnología de Alimentos y Nutrición (ICTAN-CSIC), Spanish National Research Council (CSIC), Juan de la Cierva 3, 28006 Madrid, Spain
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Mohamed Shenger MS, Filipic S, Nikolic K, Agbaba D. ESTIMATION OF LIPOPHILICITY AND RETENTION BEHAVIOR OF SOME ALPHA ADRENERGIC AND IMIDAZOLINE RECEPTOR LIGANDS USING RP-TLC. J LIQ CHROMATOGR R T 2014. [DOI: 10.1080/10739149.2014.906880] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
| | - Slavica Filipic
- a Department of Pharmaceutical Chemistry, Faculty of Pharmacy , University of Belgrade , Belgrade , Serbia
| | - Katarina Nikolic
- a Department of Pharmaceutical Chemistry, Faculty of Pharmacy , University of Belgrade , Belgrade , Serbia
| | - Danica Agbaba
- a Department of Pharmaceutical Chemistry, Faculty of Pharmacy , University of Belgrade , Belgrade , Serbia
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Polanski W, Reichmann H, Gille G. Stimulation, protection and regeneration of dopaminergic neurons by 9-methyl-β-carboline: a new anti-Parkinson drug? Expert Rev Neurother 2014; 11:845-60. [DOI: 10.1586/ern.11.1] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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Herraiz T, Guillén H, Galisteo J. Metabolite profile resulting from the activation/inactivation of 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine and 2-methyltetrahydro-β-carboline by oxidative enzymes. BIOMED RESEARCH INTERNATIONAL 2013; 2013:248608. [PMID: 23984327 PMCID: PMC3745933 DOI: 10.1155/2013/248608] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/30/2013] [Accepted: 07/03/2013] [Indexed: 11/18/2022]
Abstract
Metabolic enzymes are involved in the activation/deactivation of the 1-methyl-4-phenyl-1,2,3,6-tetrahydropyiridine (MPTP) neurotoxin and its naturally occurring analogs 2-methyltetrahydro-β-carbolines. The metabolic profile and biotransformation of these protoxins by three enzymes, monoamine oxidase (MAO), cytochrome P450, and heme peroxidases (myeloperoxidase and lactoperoxidase), were investigated and compared. The metabolite profile differed among the enzymes investigated. MAO and heme peroxidases activated these substances to toxic pyridinium and β-carbolinium species. MAO catalyzed the oxidation of MPTP to 1-methyl-4-phenyl-2,3-dihydropyridinium cation (MPDP(+)), whereas heme peroxidases catalyzed the oxidation of MPDP(+) to 1-methyl-4-phenylpyridinium (MPP(+)) and of 2-methyltetrahydro-β-carboline to 2-methyl-3,4-dihydro-β-carbolinium cation (2-Me-3,4-DH β C(+)). These substances were inactivated by cytochrome P450 2D6 through N-demethylation and aromatic hydroxylation (MPTP) and aromatic hydroxylation (2-methyltetrahydro-β-carboline). In conclusion, the toxicological effects of these protoxins might result from a balance between the rate of their activation to toxic products (i.e., N-methylpyridinium-MPP(+) and MPDP(+)- and N-methyl--β--carbolinium- βC(+)-) by MAO and heme peroxidases and the rate of inactivation (i.e., N-demethylation, aromatic hydroxylation) by cytochrome P450 2D6.
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Affiliation(s)
- Tomás Herraiz
- Instituto de Ciencia y Tecnología de Alimentos y Nutrición, Consejo Superior de Investigaciones Científicas, Juan de la Cierva 3, 28006 Madrid, Spain.
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Zádori ZS, Fehér Á, Al-Khrasani M, Lackó E, Tóth VE, Brancati SB, Hein L, Mátyus P, Gyires K. Imidazoline versus alpha2-adrenoceptors in the control of gastric motility in mice. Eur J Pharmacol 2013; 705:61-7. [DOI: 10.1016/j.ejphar.2013.02.043] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2012] [Revised: 02/16/2013] [Accepted: 02/24/2013] [Indexed: 10/27/2022]
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Smith KL, Ford GK, Jessop DS, Finn DP. Behavioural, neurochemical and neuroendocrine effects of the endogenous β-carboline harmane in fear-conditioned rats. J Psychopharmacol 2013; 27:162-70. [PMID: 23015542 DOI: 10.1177/0269881112460108] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The putative endogenous imidazoline binding site ligand harmane enhances neuronal activation in response to psychological stress and alters behaviour in animal models of anxiety and antidepressant efficacy. However, the neurobiological mechanisms underlying harmane's psychotropic effects are poorly understood. We investigated the effects of intraperitoneal injection of harmane (2.5 and 10 mg/kg) on fear-conditioned behaviour, hypothalamo-pituitary-adrenal axis activity, and monoaminergic activity within specific fear-associated areas of the rat brain. Harmane had no significant effect on the duration of contextually induced freezing or 22 kHz ultrasonic vocalisations and did not alter the contextually induced suppression of motor activity, including rearing. Harmane reduced the duration of rearing and tended to increase freezing in non-fear-conditioned controls, suggesting potential sedative effects. Harmane increased plasma ACTH and corticosterone concentrations, and serotonin (in hypothalamus, amygdaloid cortex, prefrontal cortex and hippocampus) and noradrenaline (prefrontal cortex) content, irrespective of fear-conditioning. Furthermore, harmane reduced dopamine and serotonin turnover in the PFC and hypothalamus, and serotonin turnover in the amygdaloid cortex in both fear-conditioned and non-fear-conditioned rats. In contrast, harmane increased dopamine and noradrenaline content and reduced dopamine turnover in the amygdala of fear-conditioned rats only, suggesting differential effects on catecholaminergic transmission in the presence and absence of fear. The precise mechanism(s) mediating these effects of harmane remain to be determined but may involve its inhibitory action on monoamine oxidases. These findings support a role for harmane as a neuromodulator, altering behaviour, brain neurochemistry and neuroendocrine function.
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Affiliation(s)
- Karen L Smith
- Pharmacology and Therapeutics, School of Medicine and NCBES Neuroscience Cluster, National University of Ireland, Galway, Ireland
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Nasehi M, Piri M, Abdollahian M, Zarrindast MR. Involvement of nitrergic system of CA1in harmane induced learning and memory deficits. Physiol Behav 2013; 109:23-32. [DOI: 10.1016/j.physbeh.2012.10.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2012] [Revised: 09/18/2012] [Accepted: 10/19/2012] [Indexed: 01/09/2023]
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Brierley DI, Davidson C. Developments in harmine pharmacology--implications for ayahuasca use and drug-dependence treatment. Prog Neuropsychopharmacol Biol Psychiatry 2012; 39:263-72. [PMID: 22691716 DOI: 10.1016/j.pnpbp.2012.06.001] [Citation(s) in RCA: 82] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/14/2012] [Revised: 05/16/2012] [Accepted: 06/03/2012] [Indexed: 12/14/2022]
Abstract
Ayahuasca is a hallucinogenic botanical mixture originating in the Amazon area where it is used ritually, but is now being taken globally. The 2 main constituents of ayahuasca are N,N-dimethyltryptamine (DMT), a hallucinogen, and harmine, a monoamine oxidase inhibitor (MAOI) which attenuates the breakdown of DMT, which would otherwise be broken down very quickly after oral consumption. Recent developments in ayahuasca use include the sale of these compounds on the internet and the substitution of related botanical (anahuasca) or synthetic (pharmahuasca) compounds to achieve the same desired hallucinogenic effects. One intriguing result of ayahuasca use appears to be improved mental health and a reduction in recidivism to alternate (alcohol, cocaine) drug use. In this review we discuss the pharmacology of ayahuasca, with a focus on harmine, and suggest pharmacological mechanisms for the putative reduction in recidivism to alcohol and cocaine misuse. These pharmacological mechanisms include MAOI, effects at 5-HT(2A) and imidazoline receptors and inhibition of dual-specificity tyrosine-phosphorylation regulated kinase 1A (DYRK1A) and the dopamine transporter. We also speculate on the therapeutic potential of harmine in other CNS conditions.
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Affiliation(s)
- Daniel I Brierley
- Pharmacology & Cell Physiology, Division of Biomedical Science, St George's, University of London, Cranmer Terrace, London SW17 0RE, United Kingdom
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Tsuchiya H, Ohmoto S. Comparative effects of β-carbolines on platelet aggregation and lipid membranes. Pharmacol Rep 2011; 62:689-95. [PMID: 20885009 DOI: 10.1016/s1734-1140(10)70326-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2009] [Revised: 11/19/2009] [Indexed: 11/16/2022]
Abstract
The effects of 14 β-carbolines on human platelet aggregability were comparatively studied, and the effects on lipid membranes were determined. Several β-carbolines inhibited platelet aggregation induced by collagen, epinephrine, adenosine 5'-diphosphate, platelet-activating factor and thrombin. This activity was structure-dependent. Of all the compounds examined, 1-methyl-1,2,3,4-tetrahydro-β-carboline was the most potent. Treatment with 15-177 μM 1-methyl-1,2,3,4-tetrahydro-β-carboline inhibited the aggregation responses to different stimulants by up to 50%. Its potency was comparable to or greater than that of the antiplatelet reference, aspirin. The next most effective compound was 1-methyl-3,4-dihydro-β-carboline. The structure-antiplatelet activity relationship indicated that this activity is reduced by oxidation to 1-methyl-β-carboline, by demethylation to 1,2,3,4-tetrahydro-β-carboline and by 6-hydroxylation, 7-hydroxylation and 3-carboxylation. Active 1-methyl-1,2,3,4-tetrahydro-β-carboline fluidized biomimetic membranes at 25-250 μM which corresponded to the antiaggregatory concentrations, although relatively inactive 6-hydroxy-1-methyl-1,2,3,4-tetrahydro-β-carboline showed no significant effects on the membranes. β-Carbolines are considered to be effective antiplatelet agents that inhibit human platelet aggregation by interacting with lipid membranes to modify fluidity.
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Affiliation(s)
- Hironori Tsuchiya
- Department of Dental Basic Education, Asahi University School of Dentistry, 1851-1 Hozumi, Mizuho, Gifu 501-0296, Japan.
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New imidazoline/α2-adrenoceptors affecting compounds—4(5)-(2-aminoethyl)imidazoline (dihydrohistamine) derivatives. Synthesis and receptor affinity studies. Bioorg Med Chem 2011; 19:156-67. [DOI: 10.1016/j.bmc.2010.11.039] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2010] [Revised: 11/16/2010] [Accepted: 11/17/2010] [Indexed: 11/22/2022]
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21
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Sphingosine-1-phosphate: a potential therapeutic agent against human breast cancer. Invest New Drugs 2009; 29:396-9. [DOI: 10.1007/s10637-009-9375-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2009] [Accepted: 12/09/2009] [Indexed: 10/20/2022]
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Herraiz T, Guillén H, Arán VJ. Oxidative Metabolism of the Bioactive and Naturally Occurring β-Carboline Alkaloids, Norharman and Harman, by Human Cytochrome P450 Enzymes. Chem Res Toxicol 2008; 21:2172-80. [DOI: 10.1021/tx8002565] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Tomás Herraiz
- Spanish Council for Scientific Research, Instituto de Fermentaciones Industriales, CSIC, and Instituto de Química Médica, CSIC, Juan de la Cierva, 3, 28006 Madrid, Spain
| | - Hugo Guillén
- Spanish Council for Scientific Research, Instituto de Fermentaciones Industriales, CSIC, and Instituto de Química Médica, CSIC, Juan de la Cierva, 3, 28006 Madrid, Spain
| | - Vicente J. Arán
- Spanish Council for Scientific Research, Instituto de Fermentaciones Industriales, CSIC, and Instituto de Química Médica, CSIC, Juan de la Cierva, 3, 28006 Madrid, Spain
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Herraiz T, Guillén H, Galisteo J. N-methyltetrahydro-beta-carboline analogs of 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) neurotoxin are oxidized to neurotoxic beta-carbolinium cations by heme peroxidases. Biochem Biophys Res Commun 2007; 356:118-23. [PMID: 17346675 DOI: 10.1016/j.bbrc.2007.02.089] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2007] [Accepted: 02/19/2007] [Indexed: 11/22/2022]
Abstract
2-Methyl-1,2,3,4-tetrahydro-beta-carboline (2-Me-THbetaC) and 2,9-dimethyl-1,2,3,4-tetrahydro-beta-carboline (2,9-diMe-THbetaC) are naturally occurring analogs of the Parkinsonian neurotoxin 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP), whereas their corresponding aromatic 2-methyl-beta-carbolinium cations resemble 1-methyl-4-phenylpyridinium (MPP(+)) and are considered potential toxins involved in Parkinson's disease (PD). To become toxicants, 2-methyltetrahydro-beta-carbolines need to be oxidized (aromatized) by human metabolic enzymes to pyridinium-like (beta-carbolinium) cations as occur with MPTP/MPP(+) model. In contrast to MPTP, human MAO-A or -B were not able to oxidize 2-Me-THbetaC to pyridinium-like cations. Neither, cytochrome P-450 2D6 or a mixture of six P450 enzymes carried out this oxidation in a significant manner. However, 2-Me-THbetaC and 2,9-diMe-THbetaC were efficiently oxidized by horseradish peroxidase (HRP), lactoperoxidase (LPO), and myeloperoxidase (MPO) to 2-methyl-3,4-dihydro-beta-carbolinium cations (2-Me-DHbetaC(+), 2,9-diMe-DHbetaC(+)) as the main products, and detectable amount of 2-methyl-beta-carbolinium cations (2-Me-betaC(+), 2,9-diMe-betaC(+)). The apparent kinetic parameters (k(cat), k(4)) were similar for HRP and LPO and higher for MPO. Peroxidase inhibitors (hydroxylamine, sodium azide, and ascorbic acid) highly reduced or abolished this oxidation. Although MPTP was not oxidized by peroxidases; its intermediate metabolite 1-methyl-4-phenyl-2,3-dihydropyridinium cation (MPDP(+)) was efficiently oxidized to MPP(+) by heme peroxidases. It is concluded that heme peroxidases could be key catalysts responsible for the aromatization (bioactivation) of endogenous and naturally occurring N-methyltetrahydro-beta-carbolines and related protoxins to toxic pyridinium-like cations resembling MPP(+), suggesting a role for these enzymes in toxicological and neurotoxicological processes.
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Affiliation(s)
- Tomás Herraiz
- Spanish Council for Scientific Research, CSIC, Instituto de Fermentaciones Industriales, Juan de la Cierva 3, 28006 Madrid, Spain
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Guillem K, Vouillac C, Azar MR, Parsons LH, Koob GF, Cador M, Stinus L. Monoamine oxidase A rather than monoamine oxidase B inhibition increases nicotine reinforcement in rats. Eur J Neurosci 2006; 24:3532-40. [PMID: 17229101 DOI: 10.1111/j.1460-9568.2006.05217.x] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Although nicotine is considered to be responsible for the addictive properties of tobacco, growing evidence underlines the importance of non-nicotine components in smoking reinforcement. It has been shown that tobacco smoke contains monoamine oxidase (MAO) A and B inhibitors and decreases MAO-A and MAO-B activity in smokers. Here, we investigated the effects of clorgyline hydrochloride (irreversible MAO-A inhibitor; 2 mg/kg/day), selegiline (irreversible MAO-B inhibitor; 4 mg/kg) and the beta-carboline norharmane hydrochloride (reversible MAO-B inhibitor; 5 mg/kg/day) treatments on nicotine self-administration (30 microg/kg/infusion, free base) in rats. Independent of the responsiveness to novelty and locomotor activity stimulation, only clorgyline hydrochloride treatment increased the intake of nicotine in a fixed-ratio schedule (FR5) of reinforcement. When a progressive-ratio schedule was implemented, both clorgyline hydrochloride and norharmane hydrochloride treatments potentiated the reinforcing effects of nicotine, whereas selegiline had no effect. Taken together, these results indicate that MAO-A inhibition interacts with nicotine to enhance its rewarding effects in rats and suggest that other compounds present in tobacco, such as beta-carboline, may also play an important role in sustaining smoking behavior in humans.
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Affiliation(s)
- Karine Guillem
- Laboratoire de Neuropsychobiologie des Désadaptations, UMR CNRS 5541, Université de Bordeaux 2, BP 31, 146 rue Léo Saignat, 33076 Bordeaux, cedex, France
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Volk RB. Screening of microalgae for species excreting norharmane, a manifold biologically active indole alkaloid. Microbiol Res 2006; 163:307-13. [PMID: 16872816 DOI: 10.1016/j.micres.2006.06.002] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/01/2006] [Indexed: 11/18/2022]
Abstract
A screening of microalgae strains is described, with the objective to discover more species besides the known cyanobacterium Nodularia harveyana which excrete the manifold biologically active and co-mutagenic indole alkaloid norharmane (9H-pyrido(3,4-b)indole) into their environment. Seven more cyanobacterial species, Anabaena cylindrica, Anabaena inaequalis, Anabaenopsis siamensis, Chroococcus minutus, Nostoc carneum, Nostoc commune and Phormidium foveolarum, were newly discovered. The norharmane concentrations detected for cyanobacterial culture media varied in a species-dependent manner from less than 1 up to 525 microg l(-1). The risk for humans and livestock, resulting from the natural appearance of norharmane as an extracellular metabolite of various cyanobacteria, is discussed.
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Affiliation(s)
- Rainer-B Volk
- Department of Pharmaceutical Biology, University of Kiel, Pharmaceutical Institute, Kiel, Germany.
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Anderson NJ, Seif I, Nutt DJ, Hudson AL, Robinson ESJ. Autoradiographical distribution of imidazoline binding sites in monoamine oxidase A deficient mice. J Neurochem 2006; 96:1551-9. [PMID: 16476082 DOI: 10.1111/j.1471-4159.2006.03662.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
This study has used receptor autoradiography to characterize imidazoline binding sites (I-BS) in monoamine oxidase (MAO) A knockout and wild-type mice. A comparison between MAO-A and MAO-B, binding of the endogenous beta-carboline [(3)H]harmane, and I-BS, has been made using sections from brain and kidney. The loss of binding to MAO-A in the knockout animals was confirmed using the selective radioligand [(3)H]Ro41-1049, with labelling reduced to background levels. The binding of [(3)H]Ro19-6327 to MAO-B was unaffected, indicating no change in this isoform in response to the loss of MAO-A. A reduction in binding to the I(2)-BS, as labelled by both [(3)H]idazoxan and [(3)H]2-BFI (2-(2-benzofuranyl)-2-imidazoline), was seen in the MAO-A knockout animals in both brain and kidney sections, whereas binding to the I(1)-BS in kidney sections remained unchanged. The loss of I(2) binding was found to be regionally dependent and was positively correlated with the relative expression of MAO-A in specific regions in the wild-type animals. Using the MAO-A knockout mice it was also possible to demonstrate a non-MAO-A population of binding sites labelled by the putative I-BS endogenous ligand, harmane.
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Affiliation(s)
- Neil J Anderson
- Department of Pharmacology, School of Medical Sciences, Bristol, UK.
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Herraiz T, Chaparro C. Human monoamine oxidase enzyme inhibition by coffee and β-carbolines norharman and harman isolated from coffee. Life Sci 2006; 78:795-802. [PMID: 16139309 DOI: 10.1016/j.lfs.2005.05.074] [Citation(s) in RCA: 100] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2005] [Accepted: 05/18/2005] [Indexed: 11/28/2022]
Abstract
Monoamine oxidase (MAO) is a mitochondrial outer-membrane flavoenzyme involved in brain and peripheral oxidative catabolism of neurotransmitters and xenobiotic amines, including neurotoxic amines, and a well-known target for antidepressant and neuroprotective drugs. Recent epidemiological studies have consistently shown that coffee drinkers have an apparently lower incidence of Parkinson's disease (PD), suggesting that coffee might somehow act as a purported neuroprotectant. In this paper, "ready to drink" coffee brews exhibited inhibitory properties on recombinant human MAO A and B isozymes catalyzing the oxidative deamination of kynuramine, suggesting that coffee contains compounds acting as MAO inhibitors. MAO inhibition was reversible and competitive for MAO A and MAO B. Subsequently, the pyrido-indole (beta-carboline) alkaloids, norharman and harman, were identified and isolated from MAO-inhibiting coffee, and were good inhibitors on MAO A (harman and norharman) and MAO B (norharman) isozymes. beta-carbolines isolated from ready-to-drink coffee were competitive and reversible inhibitors and appeared up to 210 microg/L, confirming that coffee is the most important exogenous source of these alkaloids in addition to cigarette smoking. Inhibition of MAO enzymes by coffee and the presence of MAO inhibitors that are also neuroactive, such as beta-carbolines and eventually others, might play a role in the neuroactive actions including a purported neuroprotection associated with coffee consumption.
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Affiliation(s)
- Tomas Herraiz
- Spanish Council for Scientific Research. CSIC. Instituto de Fermentaciones Industriales, Juan de la Cierva, 3, 28006 Madrid, Spain.
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Herraiz T, Chaparro C. Analysis of monoamine oxidase enzymatic activity by reversed-phase high performance liquid chromatography and inhibition by beta-carboline alkaloids occurring in foods and plants. J Chromatogr A 2005; 1120:237-43. [PMID: 16386263 DOI: 10.1016/j.chroma.2005.12.009] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2005] [Revised: 11/26/2005] [Accepted: 12/02/2005] [Indexed: 11/23/2022]
Abstract
Monoamine oxidase (MAO) is a flavin adenine dinucleotide (FAD)-containing enzyme located at the outer membranes of mitochondria that catalyzes the oxidative deamination of biogenic and xenobiotic amines. We have used a chromatographic method to measure MAO-enzymatic activity by using kynuramine as a non-selective substrate with its MAO-oxidation product subsequently analyzed by RP-HPLC-DAD and HPLC-mass spectrometry (MS). This method was applied to study the kinetic parameters, inhibition and reaction products of MAO recombinant enzymes in presence of tetrahydro-beta-carboline and beta-carboline alkaloids occurring in foods, plants and mammals. Analysis by HPLC showed that tetrahydro-beta-carbolines or beta-carbolines were not modified by MAO. Several beta-carbolines such as tryptoline (1,2,3,4-tetrahydro-beta-carboline) and 1-methyltryptoline (1-methyl-1,2,3,4-tetrahydro-beta-carboline) were inhibitors of MAO-A; instead their corresponding 6-hydroxy-derivatives (6-hydroxytryptoline and 6-hydroxy-1-methyltryptoline) lacked this activity. Tetrahydro-beta-carboline-3-carboxylic acids were unable to inhibit MAO enzymes. In contrast, their oxidation products, i.e. the fully aromatic beta-carbolines (norharman and harman), acted as good inhibitors of MAO. Two tetrahydro-beta-carbolines (i.e. tryptoline and 1-methyltryptoline) occurring in foods were isolated by solid-phase extraction (SPE) and RP-HPLC from selected samples of sausages and the corresponding extracts exhibited good inhibition properties over MAO-A. These results suggest that beta-carbolines from foods, plants, and mammals may exert inhibitory actions on MAO enzymes.
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Affiliation(s)
- Tomas Herraiz
- Spanish Council for Scientific Research, CSIC, Instituto de Fermentaciones Industriales, Juan de la Cierva 3, 28006 Madrid, Spain.
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Touiki K, Rat P, Molimard R, Chait A, de Beaurepaire R. Harmane inhibits serotonergic dorsal raphe neurons in the rat. Psychopharmacology (Berl) 2005; 182:562-9. [PMID: 16133137 DOI: 10.1007/s00213-005-0118-0] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/26/2005] [Accepted: 06/23/2005] [Indexed: 02/03/2023]
Abstract
RATIONALE Harmane and norharmane (two beta-carbolines) are tobacco components or products. The effects of harmane and norharmane on serotonergic raphe neurons remain unknown. Harmane and norharmane are inhibitors of the monoamine oxidases A (MAO-A) and B (MAO-B), respectively. OBJECTIVES To study the effects of harmane, norharmane, befloxatone (MAOI-A), and selegiline (MAOI-B) on the firing of serotonergic neurons. To compare the effects of these compounds to those of nicotine (whose inhibitory action on serotonergic neurons has been previously described). The effects of cotinine, a metabolite of nicotine known to interact with serotonergic systems, are also tested. METHODS In vivo electrophysiological recordings of serotonergic dorsal raphe neurons in the anaesthetized rat. RESULTS Nicotine, harmane, and befloxatone inhibited serotonergic dorsal raphe neurons. The other compounds had no effects. The inhibitory effect of harmane (rapid and long-lasting inhibition) differed from that of nicotine (short and rapidly reversed inhibition) and from that of befloxatone (slow, progressive, and long-lasting inhibition). The inhibitory effects of harmane and befloxatone were reversed by the 5-HT1A antagonist WAY 100 635. Pretreatment of animals with p-chlorophenylalanine abolished the inhibitory effect of befloxatone, but not that of harmane. CONCLUSIONS Nicotine, harmane, and befloxatone inhibit the activity of raphe serotonergic neurons. Therefore, at least two tobacco compounds, nicotine and harmane, inhibit the activity of serotonergic neurons. The mechanism by which harmane inhibits serotonergic dorsal raphe neurons is likely unrelated to a MAO-A inhibitory effect.
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Affiliation(s)
- Khalid Touiki
- Laboratoire de Psychopharmacologie, Centre Hospitalier Paul Guiraud, 54 avenue de la République, Villejuif, 94806, France
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Anderson NJ, Tyacke RJ, Husbands SM, Nutt DJ, Hudson AL, Robinson ESJ. In vitro and ex vivo distribution of [3H]harmane, an endogenous beta-carboline, in rat brain. Neuropharmacology 2005; 50:269-76. [PMID: 16242163 DOI: 10.1016/j.neuropharm.2005.08.022] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2005] [Revised: 08/23/2005] [Accepted: 08/25/2005] [Indexed: 11/24/2022]
Abstract
The endogenous beta-carboline, harmane, has been shown to bind to monoamine oxidase A (MAO-A) and a separate, high affinity, non-MAO site. Research in our laboratory has shown that harmane is an active component of clonidine-displacing substance (CDS), the proposed endogenous ligand for imidazoline binding sites (IBS). In the present study we have investigated the distribution of [3H]harmane in rat brain, and related the binding profile to the distribution of the MAO-A selective ligand [3H]Ro41-1049 and the I2BS ligand [3H]2-BFI. The in vivo distribution of [3H]harmane following intravenous administration was also investigated. Receptor autoradiography revealed a highly significant correlation for the distribution of [3H]harmane and [3H]Ro41-1049, and a significant correlation for [3H]harmane and the I2BS ligand [3H]2-BFI. The in vivo distribution of [3H]harmane suggests that the ligand accumulates in the adrenal gland and throughout the brain with the primary route of excretion occurring via the duodenum. In conclusion, these studies have shown that [3H]harmane labels a population of binding sites that reflect the distribution of MAO-A. Further evidence for a non-MAO, IBS [3H]harmane population has not been shown but the high level of expression of the MAO-A site is likely to have masked the much smaller population of I2BS.
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Affiliation(s)
- Neil J Anderson
- Department of Pharmacology, School of Medical Sciences, University Walk, Clifton, Bristol, BS8 1TD, UK
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Miralles A, Esteban S, Sastre-Coll A, Moranta D, Asensio VJ, García-Sevilla JA. High-affinity binding of beta-carbolines to imidazoline I2B receptors and MAO-A in rat tissues: norharman blocks the effect of morphine withdrawal on DOPA/noradrenaline synthesis in the brain. Eur J Pharmacol 2005; 518:234-42. [PMID: 16061219 DOI: 10.1016/j.ejphar.2005.06.023] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2005] [Revised: 06/14/2005] [Accepted: 06/20/2005] [Indexed: 11/21/2022]
Abstract
This study was designed to determine the affinity and binding profile of beta-carbolines for imidazoline I2 receptors and catalytic sites of monoamine oxidase (MAO)-A/B in rat brain and liver. The aim was also directed to assess the in vivo effects of norharman (beta-carboline) and LSL 60101 (I2 ligand) on brain 3,4-dihydroxyphenylalanine (DOPA) synthesis in morphine-dependent rats. Competition experiments against [3H]2-BFI revealed that beta-carbolines recognize the high- and low-affinity components of the brain imidazoline I2 receptor with the rank order of potency (K(iH) in nM): noreleagnine (12)>norharman (20)>harmalol (82)>harmaline (177)>>harmine (630)>harman (700)>>FG-7142 (>100,000). In liver, this rank was different: harmine (51)>harmaline (103)=noreleagnine (103)>>harmalol (1290)>harman (2000)>>norharman (12,382)>>FG-7142 (>100,000). In brain and liver, competition curves for beta-carbolines against [3H]Ro41-1049 (MAO-A) and [3H]Ro19-6327 (MAO-B) were monophasic and resulted in different drug potencies for the two MAO isozymes (higher affinities for MAO-A) and in similar pharmacological profiles in both tissues. In morphine-dependent rats, naloxone (2 mg/kg, 2 h)-precipitated withdrawal increased the synthesis of DOPA in the cerebral cortex and hippocampus (50%). Pretreatment with norharman (20 mg/kg) or LSL 60101 (20 mg/kg) (30 min before naloxone) fully prevented the stimulatory effect of opiate withdrawal on DOPA synthesis. Norharman and LSL 60101 also attenuated the severity of the withdrawal syndrome. The results indicate that beta-carbolines bind with high affinity to imidazoline I2B receptors, and similarly to I2 ligands (LSL 60101) can block the behavioural and biochemical effects of opiate withdrawal.
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Affiliation(s)
- Antonio Miralles
- Laboratori de Neurofarmacologia, Institut Universitari d'Investigació en Ciències de la Salut, Universitat de les Illes Balears, Ctra. Valldemossa km 7.5, E-07122, Palma de Mallorca, Spain
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Cambridge N, Robinson ESJ. Effect of BU98008, an imidazoline1-binding site ligand, on body temperature in mice. Eur J Pharmacol 2005; 519:86-90. [PMID: 16109403 DOI: 10.1016/j.ejphar.2005.07.010] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2005] [Revised: 06/27/2005] [Accepted: 07/08/2005] [Indexed: 11/28/2022]
Abstract
Previous studies using the novel imidazoline1-binding site ligand 1-(4,5-dihydro-1H-imidazol-2-yl)isoquinoline hydrochloride, BU98008, have shown it induces a hypothermic response in rodents following intraperitoneal administration. Radioligand binding data has shown that BU98008 is a highly selective imidazoline1-binding site ligand with 300 fold selectively for the imidazoline1-binding site relative to alpha2-adrenoceptors. However, alpha2-adrenoceptor agonists are known to induce hypothermia, therefore, the present study has investigated the ability of the selective alpha2-adrenoceptor antagonist, RX811059 (2-ethoxy idazoxan) and the mixed imidazoline1-binding site/alpha2-adrenoceptor antagonist, efaroxan, to attenuate the BU98008-induced hypothermia. Preliminary experiments confirmed that BU98008 induced a dose-dependent decrease in body temperature in mice at 10 and 20 mg/kg. The response was not affected by pre-treatment with RX811059 but was significantly attenuated following pre-treatment with efaroxan. These data suggest that BU98008-induced hypothermia is mediated by activation of imidazoline1-binding site. Body temperature may therefore provide a novel assay for investigating agonist and antagonist action at the imidazoline1-binding site.
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Affiliation(s)
- Naomi Cambridge
- Department of Pharmacology, School of Medical Sciences, University Walk, Clifton, Bristol BS8 1TD, UK
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Anderson NJ, Lupo PA, Nutt DJ, Hudson AL, Robinson ESJ. Characterisation of imidazoline I2 binding sites in pig brain. Eur J Pharmacol 2005; 519:68-74. [PMID: 16109401 DOI: 10.1016/j.ejphar.2005.06.042] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2005] [Accepted: 06/28/2005] [Indexed: 11/29/2022]
Abstract
The imidazoline I2 binding sites in the central nervous system have previously been described in several different species including rat, mouse, rabbit and frog. The present study has investigated the imidazoline I2 binding site, and its relationship to the monoamine oxidase isoforms, in pig whole brain and compared the results obtained with data from other species. Results from saturation binding studies revealed that the imidazoline I2-selective ligand, [3H]2BFI (2-(2-benzofuranyl)-2-imidazoline) labelled a single saturable population of sites with a KD=6.6 nM and Bmax=771.7 fmol/mg protein. The pharmacological characterisation of the sites was similar to that previously reported with a rank order of potency for the imidazoline I2 ligands of 2BFI>BU224>Idazoxan>BU226. Displacement by the imidazoline I1 ligands was low affinity and the monoamine oxidase inhibitors displaced with micromolar affinity. The majority of compounds displaced the binding in a monophasic manner, however, displacement by the putative endogenous ligand, harmane was biphasic. The relative populations of the two monoamine oxidase isoforms revealed a 10 fold greater expression of monoamine oxidase B relative to monoamine oxidase A. These data confirm the presence of imidazoline I2 binding sites in pig brain and show that their pharmacology is characteristic of that seen in other species. The proportion of monoamine oxidase A and B expressed in the pig brain is similar to that seen in the human brain therefore, given the association between imidazoline I2 binding sites and monoamine oxidase, the pig may provide a more useful model for human imidazoline I2 binding sites than other species such as the rat.
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Affiliation(s)
- Neil J Anderson
- Department of Pharmacology, School of Medical Sciences, University Walk, Clifton, Bristol BS8 1TD, UK
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Human monoamine oxidase is inhibited by tobacco smoke: beta-carboline alkaloids act as potent and reversible inhibitors. Biochem Biophys Res Commun 2005; 326:378-86. [PMID: 15582589 DOI: 10.1016/j.bbrc.2004.11.033] [Citation(s) in RCA: 209] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2004] [Indexed: 11/29/2022]
Abstract
Monoamine oxidase (MAO) is a mitochondrial outer-membrane flavoenzyme involved in brain and peripheral oxidative catabolism of neurotransmitters and xenobiotic amines, including neurotoxic amines, and a well-known target for antidepressant and neuroprotective drugs. Recently, positron emission tomography imaging has shown that smokers have a much lower activity of peripheral and brain MAO-A (30%) and -B (40%) isozymes compared to non-smokers. This MAO inhibition results from a pharmacological effect of smoke, but little is known about its mechanism. Working with mainstream smoke collected from commercial cigarettes we confirmed that cigarette smoke is a potent inhibitor of human MAO-A and -B isozymes. MAO inhibition was partly reversible, competitive for MAO-A, and a mixed-type inhibition for MAO-B. Two beta-carboline alkaloids, norharman (beta-carboline) and harman (1-methyl-beta-carboline), were identified by GC-MS, quantified, and isolated from the mainstream smoke by solid phase extraction and HPLC. Kinetics analysis revealed that beta-carbolines from cigarette smoke were competitive, reversible, and potent inhibitors of MAO enzymes. Norharman was an inhibitor of MAO-A (K(i)=1.2+/-0.18 microM) and MAO-B (K(i)=1.12+/-0.19 microM), and harman of MAO-A (K(i)=55.54+/-5.3nM). Beta-carboline alkaloids are psychopharmacologically active compounds that may occur endogenously in human tissues, including the brain. These results suggest that beta-carboline alkaloids from cigarette smoke acting as potent reversible inhibitors of MAO enzymes may contribute to the MAO-reduced activity produced by tobacco smoke in smokers. The presence of MAO inhibitors in smoke like beta-carbolines and others may help us to understand some of the purported neuropharmacological effects associated with smoking.
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Squires PE, Hills CE, Rogers GJ, Garland P, Farley SR, Morgan NG. The putative imidazoline receptor agonist, harmane, promotes intracellular calcium mobilisation in pancreatic β-cells. Eur J Pharmacol 2004; 501:31-9. [PMID: 15464060 DOI: 10.1016/j.ejphar.2004.08.018] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2004] [Revised: 08/04/2004] [Accepted: 08/09/2004] [Indexed: 10/26/2022]
Abstract
beta-Carbolines (including harmane and pinoline) stimulate insulin secretion by a mechanism that may involve interaction with imidazoline I(3)-receptors but which also appears to be mediated by actions that are additional to imidazoline receptor agonism. Using the MIN6 beta-cell line, we now show that both the imidazoline I(3)-receptor agonist, efaroxan, and the beta-carboline, harmane, directly elevate cytosolic Ca(2+) and increase insulin secretion but that these responses display different characteristics. In the case of efaroxan, the increase in cytosolic Ca(2+) was readily reversible, whereas, with harmane, the effect persisted beyond removal of the agonist and resulted in the development of a repetitive train of Ca(2+)-oscillations whose frequency, but not amplitude, was concentration-dependent. Initiation of the Ca(2+)-oscillations by harmane was independent of extracellular calcium but was sensitive to both dantrolene and high levels (20 mM) of caffeine, suggesting the involvement of ryanodine receptor-gated Ca(2+)-release. The expression of ryanodine receptor-1 and ryanodine receptor-2 mRNA in MIN6 cells was confirmed using reverse transcription-polymerase chain reaction (RT-PCR) and, since low concentrations of caffeine (1 mM) or thimerosal (10 microM) stimulated increases in [Ca(2+)](i), we conclude that ryanodine receptors are functional in these cells. Furthermore, the increase in insulin secretion induced by harmane was attenuated by dantrolene, consistent with the involvement of ryanodine receptors in mediating this response. By contrast, the smaller insulin secretory response to efaroxan was unaffected by dantrolene. Harmane-evoked changes in cytosolic Ca(2+) were maintained by nifedipine-sensitive Ca(2+)-influx, suggesting the involvement of L-type voltage-gated Ca(2+)-channels. Taken together, these data imply that harmane may interact with ryanodine receptors to generate sustained Ca(2+)-oscillations in pancreatic beta-cells and that this effect contributes to the insulin secretory response.
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Affiliation(s)
- Paul E Squires
- Molecular Physiology, Biomedical Research Institute, Department of Biological Sciences, University of Warwick, Coventry CV4 7AL, UK
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