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Semenova EI, Partevian SA, Shulskaya MV, Rudenok MM, Lukashevich MV, Baranova NM, Doronina OB, Doronina KS, Rosinskaya AV, Fedotova EY, Illarioshkin SN, Slominsky PA, Shadrina MI, Alieva AK. Analysis of ADORA2A, MTA1, PTGDS, PTGS2, NSF, and HNMT Gene Expression Levels in Peripheral Blood of Patients with Early Stages of Parkinson's Disease. BIOMED RESEARCH INTERNATIONAL 2023; 2023:9412776. [PMID: 38027039 PMCID: PMC10681775 DOI: 10.1155/2023/9412776] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/21/2023] [Revised: 10/16/2023] [Accepted: 10/24/2023] [Indexed: 12/01/2023]
Abstract
Parkinson's disease (PD) is a common chronic, age-related neurodegenerative disease. This disease is characterized by a long prodromal period. In this context, it is important to search for the genes and mechanisms that are involved in the development of the pathological process in the earliest stages of the disease. Published data suggest that blood cells, particularly lymphocytes, may be a model for studying the processes that occur in the brain in PD. Thus, in the present work, we performed an analysis of changes in the expression of the genes ADORA2A, MTA1, PTGDS, PTGS2, NSF, and HNMT in the peripheral blood of patients with early stages of PD (stages 1 and 2 of the Hoehn-Yahr scale). We found significant and PD-specific expression changes of four genes, i.e., MTA1, PTGS2, NSF, and HNMT, in the peripheral blood of patients with early stages of PD. These genes may be associated with PD pathogenesis in the early clinical stages and can be considered as potential candidate genes for this disease. Altered expression of the ADORA2A gene in treated PD patients may indicate that this gene is involved in processes affected by antiparkinsonian therapy.
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Affiliation(s)
- Ekaterina I. Semenova
- National Research Centre “Kurchatov Institute”, 2 Kurchatova Sq., 123182 Moscow, Russia
| | - Suzanna A. Partevian
- National Research Centre “Kurchatov Institute”, 2 Kurchatova Sq., 123182 Moscow, Russia
| | - Marina V. Shulskaya
- National Research Centre “Kurchatov Institute”, 2 Kurchatova Sq., 123182 Moscow, Russia
| | - Margarita M. Rudenok
- National Research Centre “Kurchatov Institute”, 2 Kurchatova Sq., 123182 Moscow, Russia
| | - Maria V. Lukashevich
- National Research Centre “Kurchatov Institute”, 2 Kurchatova Sq., 123182 Moscow, Russia
| | - Nina M. Baranova
- Peoples' Friendship University of Russia (RUDN University), 6, Miklukho-Maklaya Str., 117198 Moscow, Russia
| | - Olga B. Doronina
- Novosibirsk State Medical University, 52, Krasnyy Ave., 630091 Novosibirsk, Russia
| | - Kseniya S. Doronina
- Novosibirsk State Medical University, 52, Krasnyy Ave., 630091 Novosibirsk, Russia
| | - Anna V. Rosinskaya
- State Public Health Institution Primorsk Regional Clinical Hospital No. 1, 57 Aleutskaya St., 690091 Vladivostok, Russia
| | | | | | - Petr A. Slominsky
- National Research Centre “Kurchatov Institute”, 2 Kurchatova Sq., 123182 Moscow, Russia
| | - Maria I. Shadrina
- National Research Centre “Kurchatov Institute”, 2 Kurchatova Sq., 123182 Moscow, Russia
| | - Anelya Kh. Alieva
- National Research Centre “Kurchatov Institute”, 2 Kurchatova Sq., 123182 Moscow, Russia
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Barreto A, Silva ARR, Capitão A, Sousa ÉML, Calisto V, Maria VL. Nanoplastics increase the toxicity of a pharmaceutical, at environmentally relevant concentrations - A mixture design with Daphnia magna. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2023; 103:104258. [PMID: 37666394 DOI: 10.1016/j.etap.2023.104258] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Revised: 07/26/2023] [Accepted: 08/31/2023] [Indexed: 09/06/2023]
Abstract
In aquatic environments, nanoplastics (NPls) can adsorb pharmaceuticals. However, throughout the scientific community, there is scarce knowledge about the interactive effects of the mixture nanoplastics (NPls) with pharmaceuticals to aquatic organisms. Therefore, this study aimed to investigate if the pharmaceutical diphenhydramine (DPH) toxicological effects alters when in presence of polystyrene NPls (PSNPls). To achieve this, Daphnia magna immobilization and different biochemical biomarkers (48-hours exposure) were assessed. Synergistic interactions occurred at environmentally relevant concentrations, PSNPls+DPH induced oxidative damage, whereas no effect was observed at single exposures. With the increase of PSNPls concentration, the DPH concentration causing 50% of effect (EC50) for organisms' immobilization decreased to 0.001 mg/L. In silico analysis suggested that the DPH toxicity to D. magna occurs via the sodium-dependent serotonin transporter. The results showed interactive effects between PSNPls and DPH (implying harmful effects on D. magna), allowing more thoughtful decisions by society and policymakers regarding plastics and pharmaceuticals.
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Affiliation(s)
- Angela Barreto
- Department of Biology & CESAM, University of Aveiro, 3810-193 Aveiro, Portugal.
| | - Ana Rita R Silva
- Department of Biology & CESAM, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Ana Capitão
- Centre for Neuroscience and Cell Biology, University of Coimbra, 3004-504 Coimbra, Portugal; Centre for Innovative Biomedicine and Biotechnology, University of Coimbra, 3004-504 Coimbra, Portugal; Interdisciplinary Research Institute, University of Coimbra, 3030-789 Coimbra, Portugal
| | - Érika M L Sousa
- Department of Chemistry & CESAM, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Vânia Calisto
- Department of Chemistry & CESAM, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Vera L Maria
- Department of Biology & CESAM, University of Aveiro, 3810-193 Aveiro, Portugal
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Pant S, Jena NR. Repurposing of antiparasitic drugs against the NS2B-NS3 protease of the Zika virus. J Biomol Struct Dyn 2023:1-13. [PMID: 37747074 DOI: 10.1080/07391102.2023.2255648] [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: 02/23/2023] [Accepted: 08/28/2023] [Indexed: 09/26/2023]
Abstract
To date, no approved drugs are available to treat the Zika virus (ZIKV) infection. Therefore, it is necessary to urgently identify potential drugs against the ZIKV infection. Here, the repurposing of 30 antiparasitic drugs against the NS2B-NS3 protease of the ZIKV has been carried out by using combined docking and molecular dynamics- (MD) simulations. Based on the docking results, 5 drugs, such as Amodiaquine, Primaquine, Paromomycin, Dichlorophene, and Ivermectin were screened for further analysis by MD simulations and free energy calculations. Among these drugs, Amodiaquine and Dichlorophen are found to produce the most stable complexes and possess relative binding free energies of about -44.3 ± 3.7 kcal/mol and -41.1 ± 5.3 kcal/mol respectively. Therefore, they would act as potent small-molecule inhibitors of the ZIKV protease.However, evaluations of biological and safety activities of these drugs against the ZIKV protease are required before their clinical use.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- S Pant
- Department of Pharmacoinformatics, National Institute of Pharmaceutical Education and Research, Kolkata, India
| | - N R Jena
- Discipline of Natural Sciences, Indian Institute of Information Technology, Design and Manufacturing, Jabalpur, India
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Schake P, Dishnica K, Kaiser F, Leberecht C, Haupt VJ, Schroeder M. An interaction-based drug discovery screen explains known SARS-CoV-2 inhibitors and predicts new compound scaffolds. Sci Rep 2023; 13:9204. [PMID: 37280244 DOI: 10.1038/s41598-023-35671-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2022] [Accepted: 05/19/2023] [Indexed: 06/08/2023] Open
Abstract
The recent outbreak of the COVID-19 pandemic caused by severe acute respiratory syndrome-Coronavirus-2 (SARS-CoV-2) has shown the necessity for fast and broad drug discovery methods to enable us to react quickly to novel and highly infectious diseases. A well-known SARS-CoV-2 target is the viral main 3-chymotrypsin-like cysteine protease (Mpro), known to control coronavirus replication, which is essential for the viral life cycle. Here, we applied an interaction-based drug repositioning algorithm on all protein-compound complexes available in the protein database (PDB) to identify Mpro inhibitors and potential novel compound scaffolds against SARS-CoV-2. The screen revealed a heterogeneous set of 692 potential Mpro inhibitors containing known ones such as Dasatinib, Amodiaquine, and Flavin mononucleotide, as well as so far untested chemical scaffolds. In a follow-up evaluation, we used publicly available data published almost two years after the screen to validate our results. In total, we are able to validate 17% of the top 100 predictions with publicly available data and can furthermore show that predicted compounds do cover scaffolds that are yet not associated with Mpro. Finally, we detected a potentially important binding pattern consisting of 3 hydrogen bonds with hydrogen donors of an oxyanion hole within the active side of Mpro. Overall, these results give hope that we will be better prepared for future pandemics and that drug development will become more efficient in the upcoming years.
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Affiliation(s)
- Philipp Schake
- Bioinformatics, Biotechnology Center (BIOTEC), Technische Universität Dresden, Dresden, Saxony, Germany.
| | | | | | | | | | - Michael Schroeder
- Bioinformatics, Biotechnology Center (BIOTEC), Technische Universität Dresden, Dresden, Saxony, Germany
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Drug Repurposing to Inhibit Histamine N-Methyl Transferase. MOLECULES (BASEL, SWITZERLAND) 2023; 28:molecules28020576. [PMID: 36677633 PMCID: PMC9867436 DOI: 10.3390/molecules28020576] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/06/2022] [Revised: 01/01/2023] [Accepted: 01/03/2023] [Indexed: 01/09/2023]
Abstract
Lower activity of the histaminergic system is associated with neurological disorders, including Alzheimer's disease (AD). Thus, the enhancement of histaminergic neurotransmission by inhibition of histamine N-methyl transferase (HNMT), which degrades histamine, appears as an important approach. For this purpose, rigid and flexible molecular docking studies of 185 FDA-approved drugs with the HNMT enzyme were carried out to select two compounds to perform molecular dynamics (MD) simulations to evaluate the binding free energies and stability of the enzyme-drug complexes. Finally, an HNMT inhibition assay was performed to corroborate their effect towards HNMT. Molecular docking studies with HNMT allowed the selection of dihydroergotamine and vilazodone since these molecules showed the lowest Gibbs free energy values. Analysis of the binding mode of vilazodone showed interactions with the binding pocket of HNMT with Glu28, Gln143, and Asn283. In contrast, dihydroergotamine binds to the HNMT active site in a different location, apparently because it is overall the more rigid ligand compared to flexible vilazodone. HNMT inhibitory activity for dihydroergotamine and vilazodone was corroborated (IC50 = 72.89 μM and 45.01 μM, respectively) by in vitro assays. Drug repurposing of HNMT was achieved by employing computational studies.
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Nontryptase Urinary and Hematologic Biomarkers of Mast Cell Expansion and Mast Cell Activation: Status 2022. THE JOURNAL OF ALLERGY AND CLINICAL IMMUNOLOGY. IN PRACTICE 2022; 10:1974-1984. [PMID: 35346887 DOI: 10.1016/j.jaip.2022.03.008] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Revised: 03/14/2022] [Accepted: 03/16/2022] [Indexed: 12/17/2022]
Abstract
Quantitation of urinary metabolites of histamine, prostaglandin D2, and leukotriene E4 can fill the gap in our current efforts to improve diagnosis and management of symptomatic patients with systemic mastocytosis, and/or mast cell activation syndrome, In addition, patients symptomatic due to mast cell activation but who do not meet all the criteria for mast cell activation syndrome can have elevated baseline mediator metabolites. Serum tryptase levels have been the workhorse in diagnosing these disorders, but it has several drawbacks including the need to obtain acute and baseline samples, which require 2 visits to health care facilities and 2 venipunctures. Recently, increased baseline tryptase level has been reported in hereditary alpha tryptasemia, complicating diagnostic possibilities of an increased baseline tryptase level. Furthermore, no treatment can specifically be targeted at tryptase itself. In contrast, the finding of 1 or more elevated urinary levels of histamine, prostaglandin D2, and/or leukotriene E4 metabolites (1) greatly narrows diagnostic possibilities for causes of symptoms; (2) informs the practitioner what specific metabolic pathways are involved; and (3) targets the treatment in a specific, direct fashion. As a bonus, baseline spot/random urine samples can be obtained by the patients themselves and repeated at exactly the correct time when symptoms occur.
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Repurposing Histaminergic Drugs in Multiple Sclerosis. Int J Mol Sci 2022; 23:ijms23116347. [PMID: 35683024 PMCID: PMC9181091 DOI: 10.3390/ijms23116347] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2022] [Revised: 05/31/2022] [Accepted: 06/03/2022] [Indexed: 11/16/2022] Open
Abstract
Multiple sclerosis is an autoimmune disease with a strong neuroinflammatory component that contributes to severe demyelination, neurodegeneration and lesions formation in white and grey matter of the spinal cord and brain. Increasing attention is being paid to the signaling of the biogenic amine histamine in the context of several pathological conditions. In multiple sclerosis, histamine regulates the differentiation of oligodendrocyte precursors, reduces demyelination, and improves the remyelination process. However, the concomitant activation of histamine H1–H4 receptors can sustain either damaging or favorable effects, depending on the specifically activated receptor subtype/s, the timing of receptor engagement, and the central versus peripheral target district. Conventional drug development has failed so far to identify curative drugs for multiple sclerosis, thus causing a severe delay in therapeutic options available to patients. In this perspective, drug repurposing offers an exciting and complementary alternative for rapidly approving some medicines already approved for other indications. In the present work, we have adopted a new network-medicine-based algorithm for drug repurposing called SAveRUNNER, for quantifying the interplay between multiple sclerosis-associated genes and drug targets in the human interactome. We have identified new histamine drug-disease associations and predicted off-label novel use of the histaminergic drugs amodiaquine, rupatadine, and diphenhydramine among others, for multiple sclerosis. Our work suggests that selected histamine-related molecules might get to the root causes of multiple sclerosis and emerge as new potential therapeutic strategies for the disease.
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Barreto A, Santos J, Capitão A, Eusébio R, Pinheiro Damasceno É, Luísa Machado A, Rocha LS, Calisto V, Amorim MJB, Maria VL. Assessment of diphenhydramine toxicity - Is its mode of action conserved between human and zebrafish? ENVIRONMENT INTERNATIONAL 2022; 164:107263. [PMID: 35504231 DOI: 10.1016/j.envint.2022.107263] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2022] [Revised: 04/11/2022] [Accepted: 04/20/2022] [Indexed: 06/14/2023]
Abstract
The main aim of the study is to evaluate the effects of the pharmaceutical diphenhydramine (DPH) on embryo-larvae Danio rerio across distinct levels of organization - individual and subcellular - and correlate those effects with the DPH mode of action (MoA) assessed by in silico analysis. An embryos heartbeat rate reduction was observed at 10 mg/L DPH, but 0.001 to 10 mg/L did not significantly affect the zebrafish survival, hatching and morphology. Larvae swimming distance decreased (hypoactivity) at 1 and 10 mg/L DPH. Moreover, the straightforward movements decrease and the increase in the zigzag movements or movements with direction changes, shown an erratic swimming behavior. Energy budgets decreased for lipid (0.01 mg/L DPH) and carbohydrate (10 mg/L DPH) contents. Cholinesterase (neural function) and glutathione S-transferase (Phase II biotransformation/antioxidant processes) increased their activities at 10 mg/L DPH, where a decrease in the total glutathione content (antioxidant system) was observed. DNA damage was found at 0.01 and 10 mg/L DPH. However, a DNA repair occurred after subsequent 72 h in clean media. The in silico study revealed a relevant conservation between human and zebrafish DPH target molecules. These data provide a valuable ecotoxicological information about the DPH effects and MoA to non-target organisms.
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Affiliation(s)
- Angela Barreto
- Department of Biology & CESAM, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Joana Santos
- Department of Biology & CESAM, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Ana Capitão
- Department of Biology & CESAM, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Rodrigo Eusébio
- Department of Biology & CESAM, University of Aveiro, 3810-193 Aveiro, Portugal
| | | | - Ana Luísa Machado
- Department of Biology & CESAM, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Luciana S Rocha
- Department of Chemistry & CESAM, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Vânia Calisto
- Department of Chemistry & CESAM, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Mónica J B Amorim
- Department of Biology & CESAM, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Vera L Maria
- Department of Biology & CESAM, University of Aveiro, 3810-193 Aveiro, Portugal.
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Evaluation of xanthene-appended quinoline hybrids as potential leads against antimalarial drug targets. Mol Divers 2022; 27:709-727. [PMID: 35583686 DOI: 10.1007/s11030-022-10450-4] [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: 03/04/2022] [Accepted: 04/22/2022] [Indexed: 10/18/2022]
Abstract
A series of fused heterocycle xanthene-appended quinoline 6a-n was successfully synthesized with regioselectivity and characterized using IR, 1H NMR, 13C NMR, and mass spectral data. Molecular docking was performed to find the binding efficacy of all these newly synthesized compounds towards thirteen antimalarial drug targets. Molecular dynamics simulation was carried out to predict the stability of the ligand-bound complex in a solvent medium. Blind and site-directed docking with compounds 6a-n against 13 drug targets revealed most of the ligands to have a good binding affinity with the targets. Analysis on the basis of binding energy, binding modalities of the ligands, intermolecular interactions, and pharmacophore, we identified only one of the ligand-receptor complexes to provide better results. Molecular dynamic simulation of the selected receptor-ligand complex revealed that the synthesized compound had a better binding affinity with the receptor than the native ligand complex. Further analysis of the synthesized ligand in the laboratory may prove promising results in the search for potential antimalarial drugs.
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Karer M, Rager-Resch M, Haider T, Petroczi K, Gludovacz E, Borth N, Jilma B, Boehm T. Diamine oxidase knockout mice are not hypersensitive to orally or subcutaneously administered histamine. Inflamm Res 2022; 71:497-511. [PMID: 35303133 PMCID: PMC8989821 DOI: 10.1007/s00011-022-01558-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Revised: 02/21/2022] [Accepted: 03/04/2022] [Indexed: 11/19/2022] Open
Abstract
Objective To evaluate the contribution of endogenous diamine oxidase (DAO) in the inactivation of exogenous histamine, to find a mouse strain with increased histamine sensitivity and to test the efficacy of rhDAO in a histamine challenge model. Methods Diamine oxidase knockout (KO) mice were challenged with orally and subcutaneously administered histamine in combination with the β-adrenergic blocker propranolol, with the two histamine-N-methyltransferase (HNMT) inhibitors metoprine and tacrine, with folic acid to mimic acute kidney injury and treated with recombinant human DAO. Core body temperature was measured using a subcutaneously implanted microchip and histamine plasma levels were quantified using a homogeneous time resolved fluorescence assay. Results Core body temperature and plasma histamine levels were not significantly different between wild type (WT) and DAO KO mice after oral and subcutaneous histamine challenge with and without acute kidney injury or administration of HNMT inhibitors. Treatment with recombinant human DAO reduced the mean area under the curve (AUC) for core body temperature loss by 63% (p = 0.002) and the clinical score by 88% (p < 0.001). The AUC of the histamine concentration was reduced by 81%. Conclusions Inactivation of exogenous histamine is not driven by enzymatic degradation and kidney filtration. Treatment with recombinant human DAO strongly reduced histamine-induced core body temperature loss, histamine concentrations and prevented the development of severe clinical symptoms. Supplementary Information The online version contains supplementary material available at 10.1007/s00011-022-01558-2.
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Affiliation(s)
- Matthias Karer
- Department of Clinical Pharmacology, Medical University Vienna, Waehringer Guertel 18-20, 1090, Vienna, Austria
| | - Marlene Rager-Resch
- Department of Clinical Pharmacology, Medical University Vienna, Waehringer Guertel 18-20, 1090, Vienna, Austria
| | - Teresa Haider
- Department of Neurophysiology, Center for Brain Research, Medical University Vienna, Vienna, Austria
| | - Karin Petroczi
- Department of Clinical Pharmacology, Medical University Vienna, Waehringer Guertel 18-20, 1090, Vienna, Austria
| | - Elisabeth Gludovacz
- Department of Biotechnology, University of Natural Resources and Life Sciences, Vienna, Austria
| | - Nicole Borth
- Department of Biotechnology, University of Natural Resources and Life Sciences, Vienna, Austria
| | - Bernd Jilma
- Department of Clinical Pharmacology, Medical University Vienna, Waehringer Guertel 18-20, 1090, Vienna, Austria
| | - Thomas Boehm
- Department of Clinical Pharmacology, Medical University Vienna, Waehringer Guertel 18-20, 1090, Vienna, Austria.
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Inhibition of Astrocytic Histamine N-Methyltransferase as a Possible Target for the Treatment of Alzheimer's Disease. Biomolecules 2021; 11:biom11101408. [PMID: 34680041 PMCID: PMC8533269 DOI: 10.3390/biom11101408] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Revised: 09/20/2021] [Accepted: 09/22/2021] [Indexed: 12/03/2022] Open
Abstract
Alzheimer’s disease (AD) represents the principal cause of dementia among the elderly. Great efforts have been established to understand the physiopathology of AD. Changes in neurotransmitter systems in patients with AD, including cholinergic, GABAergic, serotoninergic, noradrenergic, and histaminergic changes have been reported. Interestingly, changes in the histaminergic system have been related to cognitive impairment in AD patients. The principal pathological changes in the brains of AD patients, related to the histaminergic system, are neurofibrillary degeneration of the tuberomammillary nucleus, the main source of histamine in the brain, low histamine levels, and altered signaling of its receptors. The increase of histamine levels can be achieved by inhibiting its degrading enzyme, histamine N-methyltransferase (HNMT), a cytoplasmatic enzyme located in astrocytes. Thus, increasing histamine levels could be employed in AD patients as co-therapy due to their effects on cognitive functions, neuroplasticity, neuronal survival, neurogenesis, and the degradation of amyloid beta (Aβ) peptides. In this sense, the evaluation of the impact of HNMT inhibitors on animal models of AD would be interesting, consequently highlighting its relevance.
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de Gregorio C, Ferrazzo G, Koniari I, Kounis NG. Acute coronary syndrome from scombroid poisoning: a narrative review of case reports. Clin Toxicol (Phila) 2021; 60:1-9. [PMID: 34396875 DOI: 10.1080/15563650.2021.1959605] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
BACKGROUND Scombroid syndrome constitutes a toxic illness caused by ingestion of improperly stored fish, usually contaminated by Gram-negative bacteria producing histamine and other toxins. Scombroid currently accounts for approximately 5% of food toxicities in the United States. Though cardiovascular complications are infrequent, some patients experienced acute coronary syndrome (ACS) on admission to hospital. This article focuses on the main pathophysiology, clinical features, therapy, and outcomes in scombroid-related ACS. METHODS Starting from the consolidated knowledge on histaminergic syndromes, we performed a literature search for studies describing patient series and single cases presenting at emergency department with scombroid toxicity complicated by myocardial ischemia. RESULTS After a pathophysiological overview on histaminergic syndromes, we carefully analyzed a dataset of 19 patients from 13 studies, published from 1997 to December 2020. Electrocardiographic, echocardiographic, angiographic features, clinical course, hospital complications, and therapeutic approach were described. Shared and differential aspects of scombroid ACS with typical atherosclerotic ischemia, Kounis, MINOCA and Takotsubo syndromes are also discussed. CONCLUSION An ischemic heart scombroid syndrome may occur in some patients after the eating of improperly stored fish food. Currently available studies indicate this as a benign condition, except for patients with history of coronary artery disease, previous ACS, or anaphylaxis. Of clinical concern, there is a potential of hemodynamic failure in the acute stage, even in apparently healthy people.
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Affiliation(s)
- Cesare de Gregorio
- Department of Clinical and Experimental Medicine, University of Messina Medical School, Messina, Italy
| | - Giuseppe Ferrazzo
- Department of Clinical and Experimental Medicine, University of Messina Medical School, Messina, Italy
| | - Ioanna Koniari
- Department of Cardiology, University Hospital of South Manchester, NHS Foundation Trust, Manchester, United Kingdom
| | - Nicholas G Kounis
- Department of Cardiology, University of Patras Medical School, Patras, Greece
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Jonnalagadda SVR, Gerace AJ, Thai K, Johnson J, Tsimenidis K, Jakubowski JM, Shen C, Henderson KJ, Tamamis P, Gkikas M. Amyloid Peptide Scaffolds Coordinate with Alzheimer’s Disease Drugs. J Phys Chem B 2019; 124:487-503. [DOI: 10.1021/acs.jpcb.9b10368] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
| | - Andrew James Gerace
- Department of Chemical Engineering, University of Massachusetts Lowell, Lowell, Massachusetts 01854, United States
| | - Kathleen Thai
- Department of Biology, University of Massachusetts Lowell, Lowell, Massachusetts 01854, United States
| | - Jonathan Johnson
- Department of Biology, University of Massachusetts Lowell, Lowell, Massachusetts 01854, United States
| | - Kostas Tsimenidis
- Department of Chemistry, University of Massachusetts Lowell, Lowell, Massachusetts 01854, United States
| | - Joseph M. Jakubowski
- Department of Chemical Engineering, Texas A&M University, College Station, Texas 77843, United States
| | - Christina Shen
- Department of Chemistry, University of Massachusetts Lowell, Lowell, Massachusetts 01854, United States
| | - Kendal J. Henderson
- Department of Chemical Engineering, Texas A&M University, College Station, Texas 77843, United States
| | - Phanourios Tamamis
- Department of Chemical Engineering, Texas A&M University, College Station, Texas 77843, United States
| | - Manos Gkikas
- Department of Chemistry, University of Massachusetts Lowell, Lowell, Massachusetts 01854, United States
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Histamine N-Methyltransferase in the Brain. Int J Mol Sci 2019; 20:ijms20030737. [PMID: 30744146 PMCID: PMC6386932 DOI: 10.3390/ijms20030737] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2019] [Revised: 02/08/2019] [Accepted: 02/08/2019] [Indexed: 12/13/2022] Open
Abstract
Brain histamine is a neurotransmitter and regulates diverse physiological functions. Previous studies have shown the involvement of histamine depletion in several neurological disorders, indicating the importance of drug development targeting the brain histamine system. Histamine N-methyltransferase (HNMT) is a histamine-metabolising enzyme expressed in the brain. Although pharmacological studies using HNMT inhibitors have been conducted to reveal the direct involvement of HNMT in brain functions, HNMT inhibitors with high specificity and sufficient blood–brain barrier permeability have not been available until now. Recently, we have phenotyped Hnmt-deficient mice to elucidate the importance of HNMT in the central nervous system. Hnmt disruption resulted in a robust increase in brain histamine concentration, demonstrating the essential role of HNMT in the brain histamine system. Clinical studies have suggested that single nucleotide polymorphisms of the human HNMT gene are associated with several brain disorders such as Parkinson’s disease and attention deficit hyperactivity disorder. Postmortem studies also have indicated that HNMT expression is altered in human brain diseases. These findings emphasise that an increase in brain histamine levels by novel HNMT inhibitors could contribute to the improvement of brain disorders.
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Optically active iodohelicene derivatives exhibit histamine N-methyl transferase inhibitory activity. J Antibiot (Tokyo) 2018; 72:476-481. [PMID: 30459457 DOI: 10.1038/s41429-018-0118-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2018] [Accepted: 10/12/2018] [Indexed: 02/06/2023]
Abstract
Optically active helicene derivatives inhibit the activity on histamine N-methyl transferase (HNMT). Specifically, methyl (P)-1,12-dimethylbenzo[c]phenanthrene-8-carboxylate with 6-iodo and 5-trifluoromethanesulfonyloxy groups inhibits HNMT activity on the μM order of IC50. Chirality is important, and (M)-isomers exhibits substantially reduced activity. The 6-iodo group is also essential, which suggests the involvement of halogen bonds in protein binding. Substituents on the sulfonate moiety also affect the inhibitory activity.
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Costiniti V, Spera I, Menabò R, Palmieri EM, Menga A, Scarcia P, Porcelli V, Gissi R, Castegna A, Canton M. Monoamine oxidase-dependent histamine catabolism accounts for post-ischemic cardiac redox imbalance and injury. Biochim Biophys Acta Mol Basis Dis 2018; 1864:3050-3059. [DOI: 10.1016/j.bbadis.2018.06.018] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2018] [Revised: 05/25/2018] [Accepted: 06/20/2018] [Indexed: 12/11/2022]
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Chen MM, Xu LH, Chang L, Yin P, Jiang ZL. Reduction of Motion Sickness Through Targeting Histamine N-Methyltransferase in the Dorsal Vagal Complex of the Brain. J Pharmacol Exp Ther 2018; 364:367-376. [PMID: 29298819 DOI: 10.1124/jpet.117.244475] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2017] [Accepted: 12/20/2017] [Indexed: 11/22/2022] Open
Abstract
To investigate the role of histamine N-methyltransferase (HNMT) activity in the development of motion sickness (MS) in the dorsal vagal complex (DVC) to inform the development of new drugs for MS, Beagle dogs and Sprague-Dawley rats were rotated to simulate MS. HNMT expression in the brain stem and DVC was measured. The effects of systemic application of tacrine, an HNMT inhibitor, on the development of MS were observed. Moreover, we microinjected a histamine receptor H1 inhibitor, promethazine, into the DVC to verify the involvement of histaminergic neurotransmission in MS. Finally, lentiviral vectors were microinjected into the DVC to determine the effects of altered HNMT expression on MS. We found the following: 1) HNMT expression in the medulla oblongata of dogs and rats insusceptible to MS was higher than in susceptible animals; 2) tacrine dose-dependently promoted MS in both animals and raised histamine level in rat medulla oblongata; 3) blocking histaminergic neurotransmission in the DVC with promethazine inhibited MS; 4) rotatory stimulus induced an elevation in HNMT expression, and vestibular training elevated the basal level of HNMT in the DVC during habituation to MS; 5) in vivo transfection of a lentiviral vector packaged with the HNMT gene increased HNMT expression in the DVC and reduced MS; and 6) microinjection of a lentiviral vector driving the interference of HNMT gene expression in vivo significantly inhibited HNMT expression in the DVC and exacerbated MS. In conclusion, HNMT expression in the brain stem is inversely correlated with MS development. Increasing HNMT expression or stimulating its activity in the DVC could inhibit MS.
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Affiliation(s)
- Miao-Miao Chen
- Department of Neurophysiology and Neuropharmacology, Institute of Nautical Medicine and Co-innovation Center of Neuroregeneration, Nantong University, Chongchuan District, Nantong, Jiangsu, People's Republic of China
| | - Li-Hua Xu
- Department of Neurophysiology and Neuropharmacology, Institute of Nautical Medicine and Co-innovation Center of Neuroregeneration, Nantong University, Chongchuan District, Nantong, Jiangsu, People's Republic of China
| | - Li Chang
- Department of Neurophysiology and Neuropharmacology, Institute of Nautical Medicine and Co-innovation Center of Neuroregeneration, Nantong University, Chongchuan District, Nantong, Jiangsu, People's Republic of China
| | - Peng Yin
- Department of Neurophysiology and Neuropharmacology, Institute of Nautical Medicine and Co-innovation Center of Neuroregeneration, Nantong University, Chongchuan District, Nantong, Jiangsu, People's Republic of China
| | - Zheng-Lin Jiang
- Department of Neurophysiology and Neuropharmacology, Institute of Nautical Medicine and Co-innovation Center of Neuroregeneration, Nantong University, Chongchuan District, Nantong, Jiangsu, People's Republic of China
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Leucine 208 in human histamine N-methyltransferase emerges as a hotspot for protein stability rationalizing the role of the L208P variant in intellectual disability. Biochim Biophys Acta Mol Basis Dis 2017; 1863:188-199. [DOI: 10.1016/j.bbadis.2016.10.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2016] [Revised: 09/20/2016] [Accepted: 10/11/2016] [Indexed: 11/19/2022]
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Jiménez-Jiménez FJ, Alonso-Navarro H, García-Martín E, Agúndez JA. Thr105Ile (rs11558538) polymorphism in the histamine N-methyltransferase (HNMT) gene and risk for Parkinson disease: A PRISMA-compliant systematic review and meta-analysis. Medicine (Baltimore) 2016; 95:e4147. [PMID: 27399132 PMCID: PMC5058861 DOI: 10.1097/md.0000000000004147] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/12/2016] [Revised: 04/14/2016] [Accepted: 06/13/2016] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND/AIMS Several neuropathological, biochemical, and pharmacological data suggested a possible role of histamine in the etiopathogenesis of Parkinson disease (PD). The single nucleotide polymorphism (SNP) rs11558538 in the histamine N-methyltransferase (HNMT) gene has been associated with the risk of developing PD by several studies but not by some others. We carried out a systematic review that included all the studies published on PD risk related to the rs11558538 SNP, and we conducted a meta-analysis following Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines. METHODS We used several databases to perform the systematic review, the software Meta-DiSc 1.1.1 to perform the meta-analysis of the eligible studies, and the Q-statistic to test heterogeneity between studies. RESULTS The meta-analysis included 4 eligible case-control association studies for the HNMT rs11558538 SNP and the risk for PD (2108 patients, 2158 controls). The frequency of the minor allele positivity showed a statistically significant association with a decreased risk for PD, both in the total series and in Caucasians. Although homozygosity for the minor allele did not reach statistical significance, the test for trend indicates the occurrence of a gene-dose effect. Global diagnostic odds ratios (95% confidence intervals) for rs11558538T were 0.61 (0.46-0.81) for the total group, and 0.63 (0.45-0.88) for Caucasian patients. CONCLUSION The present meta-analysis confirms published evidence suggesting that the HNMT rs11558538 minor allele is related to a reduced risk of developing PD.
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Affiliation(s)
- Félix Javier Jiménez-Jiménez
- Section of Neurology, Hospital Universitario del Sureste, Arganda del Rey
- Department of Medicine-Neurology, Hospital “Príncipe de Asturias,” Universidad de Alcalá, Alcalá de Henares, Madrid
| | | | | | - José A.G. Agúndez
- Department of Pharmacology, University of Extremadura, Cáceres, Spain
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K. V. D, V. V, C. R. Rational design and interaction studies of combilexins towards duplex DNA. MOLECULAR BIOSYSTEMS 2016; 12:860-7. [DOI: 10.1039/c5mb00808e] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Combilexins interact more strongly with DNA than any other class of DNA binders.
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Affiliation(s)
- Dileep K. V.
- School of Chemistry
- Indian Institute of Science Education and Research-Thiruvananthapuram
- Trivandrum-695016
- India
| | - Vijeesh V.
- Department of Biotechnology and Microbiology and Inter-University Centre for Bioscience
- Kannur University
- Palayad P O
- India
| | - Remya C.
- Department of Biotechnology and Microbiology and Inter-University Centre for Bioscience
- Kannur University
- Palayad P O
- India
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Intramolecular interactions contributing for the conformational preference of bioactive diphenhydramine: Manifestation of the gauche effect. J Mol Struct 2015. [DOI: 10.1016/j.molstruc.2015.03.033] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Heidari A, Tongsook C, Najafipour R, Musante L, Vasli N, Garshasbi M, Hu H, Mittal K, McNaughton AJM, Sritharan K, Hudson M, Stehr H, Talebi S, Moradi M, Darvish H, Arshad Rafiq M, Mozhdehipanah H, Rashidinejad A, Samiei S, Ghadami M, Windpassinger C, Gillessen-Kaesbach G, Tzschach A, Ahmed I, Mikhailov A, Stavropoulos DJ, Carter MT, Keshavarz S, Ayub M, Najmabadi H, Liu X, Ropers HH, Macheroux P, Vincent JB. Mutations in the histamine N-methyltransferase gene, HNMT, are associated with nonsyndromic autosomal recessive intellectual disability. Hum Mol Genet 2015. [PMID: 26206890 DOI: 10.1093/hmg/ddv286] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Histamine (HA) acts as a neurotransmitter in the brain, which participates in the regulation of many biological processes including inflammation, gastric acid secretion and neuromodulation. The enzyme histamine N-methyltransferase (HNMT) inactivates HA by transferring a methyl group from S-adenosyl-l-methionine to HA, and is the only well-known pathway for termination of neurotransmission actions of HA in mammalian central nervous system. We performed autozygosity mapping followed by targeted exome sequencing and identified two homozygous HNMT alterations, p.Gly60Asp and p.Leu208Pro, in patients affected with nonsyndromic autosomal recessive intellectual disability from two unrelated consanguineous families of Turkish and Kurdish ancestry, respectively. We verified the complete absence of a functional HNMT in patients using in vitro toxicology assay. Using mutant and wild-type DNA constructs as well as in silico protein modeling, we confirmed that p.Gly60Asp disrupts the enzymatic activity of the protein, and that p.Leu208Pro results in reduced protein stability, resulting in decreased HA inactivation. Our results highlight the importance of inclusion of HNMT for genetic testing of individuals presenting with intellectual disability.
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Affiliation(s)
- Abolfazl Heidari
- Molecular Neuropsychiatry and Development (MiND) Lab, The Campbell Family Mental Health Research Institute, Centre for Addiction and Mental Health (CAMH), Toronto, ON, Canada M5T 1R8, Cellular and Molecular Research Center
| | - Chanakan Tongsook
- Institute of Biochemistry, Graz University of Technology, Graz 8010, Austria
| | | | - Luciana Musante
- Max Planck Institute of Molecular Genetics, Berlin D-14195, Germany
| | - Nasim Vasli
- Molecular Neuropsychiatry and Development (MiND) Lab, The Campbell Family Mental Health Research Institute, Centre for Addiction and Mental Health (CAMH), Toronto, ON, Canada M5T 1R8
| | - Masoud Garshasbi
- Max Planck Institute of Molecular Genetics, Berlin D-14195, Germany, Department of Medical Genetics, Faculty of Medical Sciences, Tarbiat Modares University, Tehran 14117-13116, Iran
| | - Hao Hu
- Max Planck Institute of Molecular Genetics, Berlin D-14195, Germany
| | - Kirti Mittal
- Molecular Neuropsychiatry and Development (MiND) Lab, The Campbell Family Mental Health Research Institute, Centre for Addiction and Mental Health (CAMH), Toronto, ON, Canada M5T 1R8
| | | | - Kumudesh Sritharan
- Molecular Neuropsychiatry and Development (MiND) Lab, The Campbell Family Mental Health Research Institute, Centre for Addiction and Mental Health (CAMH), Toronto, ON, Canada M5T 1R8
| | | | - Henning Stehr
- Department of Medicine, Stanford University, Stanford, CA 94305-5101, USA
| | - Saeid Talebi
- Department of Medical Genetics, Medical University of Tehran, Tehran 14167-53955, Iran
| | | | - Hossein Darvish
- Department of Medical Genetics, Shahid Beheshti University of Medical Sciences, Tehran 4739, Iran
| | - Muhammad Arshad Rafiq
- Molecular Neuropsychiatry and Development (MiND) Lab, The Campbell Family Mental Health Research Institute, Centre for Addiction and Mental Health (CAMH), Toronto, ON, Canada M5T 1R8
| | - Hossein Mozhdehipanah
- Department of Neurology, Bou Ali Sina Hospital, Qazvin University of Medical Sciences, Qazvin 34197/59811, Iran
| | - Ali Rashidinejad
- Maternal, Fetal and Neonatal Research Center, Tehran University of Medical Sciences, Tehran 1419733141, Iran
| | - Shahram Samiei
- Blood Transfusion Research Center, Tehran 1449613111, Iran
| | - Mohsen Ghadami
- Department of Medical Genetics, Tehran University of Medical Sciences, Tehran 1417613151, Iran
| | | | | | - Andreas Tzschach
- Max Planck Institute of Molecular Genetics, Berlin D-14195, Germany
| | - Iltaf Ahmed
- Molecular Neuropsychiatry and Development (MiND) Lab, The Campbell Family Mental Health Research Institute, Centre for Addiction and Mental Health (CAMH), Toronto, ON, Canada M5T 1R8, Atta-ur-Rehman School of Applied Biosciences, National University of Sciences and Technology, H-12, Islamabad, Pakistan
| | - Anna Mikhailov
- Molecular Neuropsychiatry and Development (MiND) Lab, The Campbell Family Mental Health Research Institute, Centre for Addiction and Mental Health (CAMH), Toronto, ON, Canada M5T 1R8
| | - D James Stavropoulos
- Department of Paediatric Laboratory Medicine, The Hospital for Sick Children, Toronto, ON, Canada
| | - Melissa T Carter
- Division of Clinical and Metabolic Genetics, Department of Pediatrics, The Hospital for Sick Children, University of Toronto, Toronto, ON, Canada
| | | | - Muhammad Ayub
- Division of Developmental Disabilities, Department of Psychiatry, Queen's University, Kingston, ON, Canada K7L7X3
| | - Hossein Najmabadi
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran 19857, Iran, Kariminejad-Najmabadi Pathology and Genetics Center, Tehran 14667, Iran
| | | | | | - Peter Macheroux
- Institute of Biochemistry, Graz University of Technology, Graz 8010, Austria
| | - John B Vincent
- Molecular Neuropsychiatry and Development (MiND) Lab, The Campbell Family Mental Health Research Institute, Centre for Addiction and Mental Health (CAMH), Toronto, ON, Canada M5T 1R8, Department of Psychiatry, University of Toronto, Toronto, ON, Canada M5T 1R8 and Institute of Medical Science, University of Toronto, Toronto, ON, Canada M5S 1A8
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Nikolic K, Agbaba D, Stark H. Pharmacophore modeling, drug design and virtual screening on multi-targeting procognitive agents approaching histaminergic pathways. J Taiwan Inst Chem Eng 2015. [DOI: 10.1016/j.jtice.2014.09.017] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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Di Domizio A, Vitriolo A, Vistoli G, Pedretti A. SPILLO-PBSS: detecting hidden binding sites within protein 3D-structures through a flexible structure-based approach. J Comput Chem 2014; 35:2005-17. [PMID: 25179993 DOI: 10.1002/jcc.23714] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2014] [Revised: 07/30/2014] [Accepted: 08/03/2014] [Indexed: 11/11/2022]
Abstract
The study reports a flexible structure-based approach aimed at identifying binding sites within target proteins starting from a well-defined reference binding site. The method, named SPILLO potential binding sites searcher (SPILLO-PBSS), includes a suitably designed tolerance which allows an efficient recognition of the potential binding sites regardless of both involved residues and protein conformation. Hence, the proposed method overcomes the rigidity which affects the available approaches and which prevents a proper analysis of distorted binding sites. We apply SPILLO-PBSS to several test cases, including the search for the guanosine diphosphate binding site in distorted H-Ras proteins and the identification of acetylcholine binding proteins from among a library of heterogeneous resolved proteins. Tests are also performed to compare SPILLO-PBSS with other related and available methods. The encouraging results confirm the notable potentialities of this approach and lay the foundation for its use to analyze and predict target proteins on a proteome-wide scale.
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Affiliation(s)
- Alessandro Di Domizio
- Department of Biotechnology and Biosciences, University of Milano-Bicocca, Piazza della Scienza, 2, 20126, Milan, Italy; Department of Pharmaceutical Sciences, University of Milan, Via Mangiagalli, 25, 20133, Milan, Italy
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Amodiaquine, an antimalarial drug, inhibits dengue virus type 2 replication and infectivity. Antiviral Res 2014; 106:125-34. [PMID: 24680954 PMCID: PMC4523242 DOI: 10.1016/j.antiviral.2014.03.014] [Citation(s) in RCA: 83] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2014] [Revised: 03/14/2014] [Accepted: 03/18/2014] [Indexed: 12/14/2022]
Abstract
Dengue virus serotypes 1-4 (DENV1-4) are transmitted by mosquitoes which cause most frequent arboviral infections in the world resulting in ∼390 million cases with ∼25,000 deaths annually. There is no vaccine or antiviral drug currently available for human use. Compounds containing quinoline scaffold were shown to inhibit flavivirus NS2B-NS3 protease (NS2B-NS3pro) with good potencies. In this study, we screened quinoline derivatives, which are known antimalarial drugs for inhibition of DENV2 and West Nile virus (WNV) replication using the corresponding replicon expressing cell-based assays. Amodiaquine (AQ), one of the 4-aminoquinoline drugs, inhibited DENV2 infectivity measured by plaque assays, with EC50 and EC90 values of 1.08±0.09μM and 2.69±0.47 μM, respectively, and DENV2 RNA replication measured by Renilla luciferase reporter assay, with EC50 value of 7.41±1.09μM in the replicon expressing cells. Cytotoxic concentration (CC50) in BHK-21 cells was 52.09±4.25μM. The replication inhibition was confirmed by plaque assay of the extracellular virions as well as by qRT-PCR of the intracellular and extracellular viral RNA levels. AQ was stable for at least 96h and had minor inhibitory effect on entry, translation, and post-replication stages in the viral life cycle. DENV protease, 5'-methyltransferase, and RNA-dependent RNA polymerase do not seem to be targets of AQ. Both p-hydroxyanilino and diethylaminomethyl moieties are important for AQ to inhibit DENV2 replication and infectivity. Our results support AQ as a promising candidate for anti-flaviviral therapy.
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Walker DM, Wang R, Webb LJ. Conserved electrostatic fields at the Ras–effector interface measured through vibrational Stark effect spectroscopy explain the difference in tilt angle in the Ras binding domains of Raf and RalGDS. Phys Chem Chem Phys 2014; 16:20047-60. [DOI: 10.1039/c4cp00743c] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Vibrational Stark effect (VSE) spectroscopy was used to measure the electrostatic fields present at the interface of the human guanosine triphosphatase (GTPase) Ras docked with the Ras binding domain (RBD) of the protein kinase Raf.
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Affiliation(s)
- David M. Walker
- Department of Chemistry
- Center for Nano- and Molecular Science and Technology
- and Institute for Cell and Molecular Biology
- The University of Texas at Austin
- Austin, USA
| | - Ruifei Wang
- Department of Chemistry
- Center for Nano- and Molecular Science and Technology
- and Institute for Cell and Molecular Biology
- The University of Texas at Austin
- Austin, USA
| | - Lauren J. Webb
- Department of Chemistry
- Center for Nano- and Molecular Science and Technology
- and Institute for Cell and Molecular Biology
- The University of Texas at Austin
- Austin, USA
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Junker A, Fischer J, Sichhart Y, Brandt W, Dräger B. Evolution of the key alkaloid enzyme putrescine N-methyltransferase from spermidine synthase. FRONTIERS IN PLANT SCIENCE 2013; 4:260. [PMID: 23908659 PMCID: PMC3725402 DOI: 10.3389/fpls.2013.00260] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2013] [Accepted: 06/26/2013] [Indexed: 05/09/2023]
Abstract
Putrescine N-methyltransferases (PMTs) are the first specific enzymes of the biosynthesis of nicotine and tropane alkaloids. PMTs transfer a methyl group onto the diamine putrescine from S-adenosyl-l-methionine (SAM) as coenzyme. PMT proteins have presumably evolved from spermidine synthases (SPDSs), which are ubiquitous enzymes of polyamine metabolism. SPDSs use decarboxylated SAM as coenzyme to transfer an aminopropyl group onto putrescine. In an attempt to identify possible and necessary steps in the evolution of PMT from SPDS, homology based modeling of Datura stramonium SPDS1 and PMT was employed to gain deeper insight in the preferred binding positions and conformations of the substrate and the alternative coenzymes. Based on predictions of amino acids responsible for the change of enzyme specificities, sites of mutagenesis were derived. PMT activity was generated in D. stramonium SPDS1 after few amino acid exchanges. Concordantly, Arabidopsis thaliana SPDS1 was mutated and yielded enzymes with both, PMT and SPDS activities. Kinetic parameters were measured for enzymatic characterization. The switch from aminopropyl to methyl transfer depends on conformational changes of the methionine part of the coenzyme in the binding cavity of the enzyme. The rapid generation of PMT activity in SPDS proteins and the wide-spread occurrence of putative products of N-methylputrescine suggest that PMT activity is present frequently in the plant kingdom.
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Affiliation(s)
- Anne Junker
- Faculty of Science I, Institute of Pharmacy, Martin-Luther-University Halle-WittenbergHalle (Saale), Germany
| | - Juliane Fischer
- Department of Bioorganic Chemistry, Leibniz Institute of Plant BiochemistryHalle (Saale), Germany
| | - Yvonne Sichhart
- Faculty of Science I, Institute of Pharmacy, Martin-Luther-University Halle-WittenbergHalle (Saale), Germany
| | - Wolfgang Brandt
- Department of Bioorganic Chemistry, Leibniz Institute of Plant BiochemistryHalle (Saale), Germany
| | - Birgit Dräger
- Faculty of Science I, Institute of Pharmacy, Martin-Luther-University Halle-WittenbergHalle (Saale), Germany
- *Correspondence: Birgit Dräger, Faculty of Science I, Institute of Pharmacy, Martin-Luther-University Halle-Wittenberg, Hoher Weg 8, D-06120 Halle (Saale), Germany e-mail:
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Ou HC, Keating S, Wu P, Simon JA, Raible DW, Rubel EW. Quinoline ring derivatives protect against aminoglycoside-induced hair cell death in the zebrafish lateral line. J Assoc Res Otolaryngol 2012; 13:759-70. [PMID: 23053627 DOI: 10.1007/s10162-012-0353-0] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2012] [Accepted: 09/20/2012] [Indexed: 10/27/2022] Open
Abstract
We have previously published results from a screen of 1,040 FDA-approved drugs and bioactives (NINDS Custom Collection) for drugs that protect against neomycin-induced hair cell death (Ou et al., J Assoc Res Otolaryngol 10:191-203, 2009). Further evaluation of this drug library identified eight protective drugs that shared a common quinoline scaffold. These drugs were tested further in terms of their protection against other aminoglycosides, as well as their effect on aminoglycoside uptake. All of the eight quinolines that protected against neomycin were found to protect against short- and long-term gentamicin damage protocols. We then tested the structurally related compounds quinoline, isoquinoline, naphthalene, and indole for protective effects. Of these compounds, indole demonstrated a small but significant amount of protection against neomycin, while quinoline and isoquinoline partially protected against long-term gentamicin damage. We examined whether the protective activity of this group of compounds was related to known targets of the quinoline derivatives. The protective effects did not seem linked to either the cholinergic or histaminergic pathways that are regulated by some members of the quinoline family. However, all eight protective drugs were found to reduce the uptake of aminoglycosides into hair cells. Subsequent experiments suggest that reduction of uptake is the primary mechanism of protection among the quinoline drugs.
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Affiliation(s)
- Henry C Ou
- Virginia Merrill Bloedel Hearing Research Center, University of Washington, Box 357923, Seattle, WA 98195-7293, USA.
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Wilcken R, Zimmermann MO, Lange A, Zahn S, Boeckler FM. Using halogen bonds to address the protein backbone: a systematic evaluation. J Comput Aided Mol Des 2012; 26:935-45. [DOI: 10.1007/s10822-012-9592-8] [Citation(s) in RCA: 77] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2012] [Accepted: 07/19/2012] [Indexed: 10/28/2022]
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Lee SG, Alpert TD, Jez JM. Crystal structure of phosphoethanolamine methyltransferase from Plasmodium falciparum in complex with amodiaquine. Bioorg Med Chem Lett 2012; 22:4990-3. [PMID: 22771008 PMCID: PMC3401361 DOI: 10.1016/j.bmcl.2012.06.032] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2012] [Revised: 06/05/2012] [Accepted: 06/11/2012] [Indexed: 11/16/2022]
Abstract
Phosphoethanolamine N-methyltransferase (PMT) is essential for phospholipid biogenesis in the malarial parasite Plasmodium falciparum. PfPMT catalyzes the triple methylation of phosphoethanolamine to produce phosphocholine, which is then used for phosphatidylcholine synthesis. Here we describe the 2.0Å resolution X-ray crystal structure of PfPMT in complex with amodiaquine. To better characterize inhibition of PfPMT by amodiaquine, we determined the IC(50) values of a series of aminoquinolines using a direct radiochemical assay. Both structural and functional analyses provide a possible approach for the development of new small molecule inhibitors of PfPMT.
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Affiliation(s)
- Soon Goo Lee
- Department of Biology, Washington University, St. Louis, MO 63130, USA
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Zhang D, Iyer LM, Aravind L. Bacterial GRAS domain proteins throw new light on gibberellic acid response mechanisms. ACTA ACUST UNITED AC 2012; 28:2407-11. [PMID: 22829623 DOI: 10.1093/bioinformatics/bts464] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
SUMMARY Gibberellic acids (GAs) are key plant hormones, regulating various aspects of growth and development, which have been at the center of the 'green revolution'. GRAS family proteins, the primary players in GA signaling pathways, remain poorly understood. Using sequence-profile searches, structural comparisons and phylogenetic analysis, we establish that the GRAS family first emerged in bacteria and belongs to the Rossmann fold methyltransferase superfamily. All bacterial and a subset of plant GRAS proteins are likely to function as small-molecule methylases. The remaining plant versions have lost one or more AdoMet (SAM)-binding residues while preserving their substrate-binding residues. We predict that GRAS proteins might either modify or bind small molecules such as GAs or their derivatives. CONTACT aravind@ncbi.nlm.nih.gov SUPPLEMENTARY INFORMATION Supplementary Material for this article is available at Bioinformatics online.
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Affiliation(s)
- Dapeng Zhang
- National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, Bethesda, MD 20894, USA
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33
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Pharmacophore modeling, virtual screening and docking studies to identify novel HNMT inhibitors. J Taiwan Inst Chem Eng 2012. [DOI: 10.1016/j.jtice.2012.01.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Capozzi V, Russo P, Ladero V, Fernández M, Fiocco D, Alvarez MA, Grieco F, Spano G. Biogenic Amines Degradation by Lactobacillus plantarum: Toward a Potential Application in Wine. Front Microbiol 2012; 3:122. [PMID: 22485114 PMCID: PMC3316997 DOI: 10.3389/fmicb.2012.00122] [Citation(s) in RCA: 98] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2012] [Accepted: 03/14/2012] [Indexed: 11/13/2022] Open
Abstract
Biogenic amines (BA) in wine represent a toxicological risk for the health of the consumer, with several trade implications. In this study 26 strains of Lactobacillus plantarum were analyzed for their ability to degrade BA commonly found during wine fermentation. Two strains of L. plantarum were selected in reason of their ability to degrade putrescine and tyramine. The degradation was assessed in vitro, both in presence of the BA and in presence of the specific chemical precursor and of producer bacteria. The two L. plantarum biotypes were found capable to work synergically. In addition, the survival in wine-like medium and the aptitude to degrade malic acid after alcoholic fermentation of the selected L. plantarum strains was analyzed. Our results suggest the potential application of wine L. plantarum strains to design malolactic starter cultures able to degrade BA in wine.
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Modulation of Fgfr1a signaling in zebrafish reveals a genetic basis for the aggression-boldness syndrome. J Neurosci 2011; 31:13796-807. [PMID: 21957242 DOI: 10.1523/jneurosci.2892-11.2011] [Citation(s) in RCA: 104] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Behavioral syndromes are suites of two or more behaviors that correlate across environmental contexts. The aggression-boldness syndrome links aggression, boldness, and exploratory activity in a novel environment. Although aggression-boldness has been described in many animals, the mechanism linking its behavioral components is not known. Here we show that mutation of the gene encoding fibroblast growth factor receptor 1a (fgfr1a) simultaneously increases aggression, boldness, and exploration in adult zebrafish. We demonstrate that altered Fgf signaling also results in reduced brain histamine levels in mutants. Pharmacological increase of histamine signaling is sufficient to rescue the behavioral phenotype of fgfr1a mutants. Together, we show that a single genetic locus can underlie the aggression-boldness behavioral syndrome. We also identify one of the neurotransmitter pathways that may mediate clustering of these behaviors.
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Lee SG, Haakenson W, McCarter JP, Williams DJ, Hresko MC, Jez JM. Thermodynamic evaluation of ligand binding in the plant-like phosphoethanolamine methyltransferases of the parasitic nematode Haemonchus contortus. J Biol Chem 2011; 286:38060-38068. [PMID: 21914812 PMCID: PMC3207426 DOI: 10.1074/jbc.m111.290619] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2011] [Revised: 09/02/2011] [Indexed: 01/29/2023] Open
Abstract
Nematodes are a major cause of disease and the discovery of new pathways not found in hosts is critical for development of therapeutic targets. Previous studies suggest that Caenorhabditis elegans synthesizes phosphocholine via two S-adenosylmethionine (AdoMet)-dependent phosphoethanolamine methyltransferases (PMT). Here we examine two PMT from the parasitic nematode Haemonchus contortus. Sequence analysis suggests that HcPMT1 contains a methyltransferase domain in the N-terminal half of the protein and that HcPMT2 encodes a C-terminal methyltransferase domain, as in the C. elegans proteins. Kinetic analysis demonstrates that HcPMT1 catalyzes the conversion of phosphoethanolamine to phosphomonomethylethanolamine (pMME) and that HcPMT2 methylates pMME to phosphodimethylethanolamine (pDME) and pDME to phosphocholine. The IC(50) values for miltefosine, sinefungin, amodiaquine, diphenhydramine, and tacrine suggest differences in the active sites of these two enzymes. To examine the interaction of AdoMet and S-adenosylhomocysteine (AdoCys), isothermal titration calorimetry confirmed the presence of a single binding site in each enzyme. Binding of AdoMet and AdoCys is tight (K(d) ∼2-25 μm) over a range of temperatures (5-25 °C) and NaCl concentrations (0.05-0.5 m). Heat capacity changes for AdoMet and AdoCys binding suggests that each HcPMT differs in interaction surface area. Nonlinear van't Hoff plots also indicate a possible conformational change upon AdoMet/AdoCys binding. Functional analysis of the PMT from a parasitic nematode provides new insights on inhibitor and AdoMet/AdoCys binding to these enzymes.
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Affiliation(s)
- Soon Goo Lee
- Department of Biology, Washington University, St. Louis, Missouri 63130
| | | | | | | | | | - Joseph M Jez
- Department of Biology, Washington University, St. Louis, Missouri 63130.
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Klink TA, Staeben M, Twesten K, Kopp AL, Kumar M, Dunn RS, Pinchard CA, Kleman-Leyer KM, Klumpp M, Lowery RG. Development and validation of a generic fluorescent methyltransferase activity assay based on the transcreener AMP/GMP assay. ACTA ACUST UNITED AC 2011; 17:59-70. [PMID: 21956169 DOI: 10.1177/1087057111421624] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Methylation is a ubiquitous covalent modification used to control the function of diverse biomolecules including hormones, neurotransmitters, xenobiotics, proteins, nucleic acids, and lipids. Histone methyltransferases (HMTs) are currently of high interest as drug targets because of their role in epigenetic regulation; however, most HMT assay methods are either not amenable to a high-throughput screening (HTS) environment or are applicable to a limited number of enzymes. The authors developed a generic methyltransferase assay method using fluorescent immunodetection of adenosine monophosphate (AMP), which is formed from the MT reaction product S-adenosylhomocysteine in a dual-enzyme coupling step. The detection range of the assay; its suitability for HTS, including stability of reagents following dispensing and after addition to reactions; and the potential for interference from drug-like molecules was investigated. In addition, the use of the assay for measuring inhibitor potencies with peptide or intact protein substrates was examined through pilot screening with selected reference enzymes including HMT G9a. By combining a novel enzymatic coupling step with the well-characterized Transcreener AMP/GMP assay, the authors have developed a robust HTS assay for HMTs that should be broadly applicable to other types of methyltransferases as well.
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38
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Cheng T, Li Q, Wang Y, Bryant SH. Identifying compound-target associations by combining bioactivity profile similarity search and public databases mining. J Chem Inf Model 2011; 51:2440-8. [PMID: 21834535 PMCID: PMC3180241 DOI: 10.1021/ci200192v] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
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Molecular target identification is of central importance to drug discovery. Here, we developed a computational approach, named bioactivity profile similarity search (BASS), for associating targets to small molecules by using the known target annotations of related compounds from public databases. To evaluate BASS, a bioactivity profile database was constructed using 4296 compounds that were commonly tested in the US National Cancer Institute 60 human tumor cell line anticancer drug screen (NCI-60). Each compound was used as a query to search against the entire bioactivity profile database, and reference compounds with similar bioactivity profiles above a threshold of 0.75 were considered as neighbor compounds of the query. Potential targets were subsequently linked to the identified neighbor compounds by using the known targets of the query compound. About 45% of the predicted compound-target associations were successfully verified retrospectively, suggesting the possible application of BASS in identifying the targets of uncharacterized compounds and thus providing insight into the study of promiscuity and polypharmacology. Furthermore, BASS identified a significant fraction of structurally diverse compounds with similar bioactivities, indicating its feasibility of “scaffold hopping” in searching novel molecules against the target of interest.
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Affiliation(s)
- Tiejun Cheng
- National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, Bethesda, Maryland 20894, United States
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Kofler L, Ulmer H, Kofler H. Histamine 50-skin-prick test: a tool to diagnose histamine intolerance. ISRN ALLERGY 2011; 2011:353045. [PMID: 23724226 PMCID: PMC3658496 DOI: 10.5402/2011/353045] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/17/2010] [Accepted: 01/12/2011] [Indexed: 12/11/2022]
Abstract
Background. Histamine intolerance results from an imbalance between histamine intake and degradation. In healthy persons, dietary histamine can be sufficiently metabolized by amine oxidases, whereas persons with low amine oxidase activity are at risk of histamine toxicity. Diamine oxidase (DAO) is the key enzyme in degradation. Histamine elicits a wide range of effects. Histamine intolerance displays symptoms, such as rhinitis, headache, gastrointestinal symptoms, palpitations, urticaria and pruritus. Objective. Diagnosis of histamine intolerance until now is based on case history; neither a validated questionnaire nor a routine test is available. It was the aim of this trial to evaluate the usefullness of a prick-test for the diagnosis of histamine intolerance. Methods. Prick-testing with 1% histamine solution and wheal size-measurement to assess the relation between the wheal in prick-test, read after 20 to 50 minutes, as sign of slowed histamine degradation as well as history and symptoms of histamine intolerance. Results. Besides a pretest with 17 patients with HIT we investigated 156 persons (81 with HIT, 75 controls): 64 out of 81 with histamine intolerance(HIT), but only 14 out of 75 persons from the control-group presented with a histamine wheal ≥3 mm after 50 minutes (P < .0001). Conclusion and Clinical Relevance. Histamine-50 skin-prickt-test offers a simple tool with relevance.
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Affiliation(s)
- Lukas Kofler
- Private Allergy Clinic Hall i.T., Thurnfeldgasse 3a, 6060 Hall i.T., Austria
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40
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Histamine index and clinical expression of rheumatoid arthritis activity. VOJNOSANIT PREGL 2010; 67:286-90. [PMID: 20465156 DOI: 10.2298/vsp1004286t] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
BACKGROUND/AIM Many arguments prove the pathophysiologic role of histamine in the process of remodeling and joint destruction in rheumatoid arthritis. The aim of our study was to find out if there was a relation between histamine concentration in synovial fluid and blood with clinical expression of disease activity. METHODS Histamine concentration in synovial fluid and blood was determinated in 19 patients with rheumatoid arthritis. Histamine concentration measurement was based on the Shore's fluorometric method. Histamine index (HI) was evaluated as a ratio between histamine concentration in synovial fluid and blood. Disease activity score, DAS 28 (3), with three variables (erythrocyte sedimentation rate, the number of swelled joints and the number of tender joints) was also evaluated. RESULTS Our results showed that there was no significant difference in concentration of histamine in synovial fluid and blood related to disease activity. However, there was a significiant difference in the histamine index which was increased proportionally with disease activity. CONCLUSION Our study indicates that histamine index could be useful in estimation of rheumatoid arthritis activity.
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Rutherford K, Daggett V. Polymorphisms and disease: hotspots of inactivation in methyltransferases. Trends Biochem Sci 2010; 35:531-8. [PMID: 20382027 DOI: 10.1016/j.tibs.2010.03.007] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2009] [Revised: 03/10/2010] [Accepted: 03/10/2010] [Indexed: 01/13/2023]
Abstract
Methyltransferases catalyze the methylation processes essential for protein/DNA repair, transcriptional regulation, and drug metabolism in vivo. More than 500 human methyltransferase polymorphisms have been identified, many of which are linked to disease. We mapped all available coding polymorphisms of seven methyltransferases onto their structures to address their structural significance, and identified a polymorphic hotspot ∼20Å from the active site in four of the proteins. Molecular dynamics simulations of these proteins reveal a common mechanism of destabilization: the mutations alter important side-chain contacts within the polymorphic site that are propagated through the protein, thereby distorting the active site. We propose that this hotspot might have arisen to modulate enzymatic activity, with decreased activity actually conferring an advantage in three of the four methyltransferases.
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Affiliation(s)
- Karen Rutherford
- Department of Biochemistry, Box 355013, University of Washington, Seattle WA 98195-5013, USA
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42
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Bobenchik AM, Choi JY, Mishra A, Rujan IN, Hao B, Voelker DR, Hoch JC, Mamoun CB. Identification of inhibitors of Plasmodium falciparum phosphoethanolamine methyltransferase using an enzyme-coupled transmethylation assay. BMC BIOCHEMISTRY 2010; 11:4. [PMID: 20085640 PMCID: PMC2824672 DOI: 10.1186/1471-2091-11-4] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/28/2009] [Accepted: 01/19/2010] [Indexed: 01/20/2023]
Abstract
BACKGROUND The phosphoethanolamine methyltransferase, PfPMT, of the human malaria parasite Plasmodium falciparum, a member of a newly identified family of phosphoethanolamine methyltransferases (PMT) found solely in some protozoa, nematodes, frogs, and plants, is involved in the synthesis of the major membrane phospholipid, phosphatidylcholine. PMT enzymes catalyze a three-step S-adenosylmethionine-dependent methylation of the nitrogen atom of phosphoethanolamine to form phosphocholine. In P. falciparum, this activity is a limiting step in the pathway of synthesis of phosphatidylcholine from serine and plays an important role in the development, replication and survival of the parasite within human red blood cells. RESULTS We have employed an enzyme-coupled methylation assay to screen for potential inhibitors of PfPMT. In addition to hexadecyltrimethylammonium, previously known to inhibit PfPMT, two compounds dodecyltrimethylammonium and amodiaquine were also found to inhibit PfPMT activity in vitro. Interestingly, PfPMT activity was not inhibited by the amodiaquine analog, chloroquine, or other aminoquinolines, amino alcohols, or histamine methyltransferase inhibitors. Using yeast as a surrogate system we found that unlike wild-type cells, yeast mutants that rely on PfPMT for survival were sensitive to amodiaquine, and their phosphatidylcholine biosynthesis was inhibited by this compound. Furthermore NMR titration studies to characterize the interaction between amoidaquine and PfPMT demonstrated a specific and concentration dependent binding of the compound to the enzyme. CONCLUSION The identification of amodiaquine as an inhibitor of PfPMT in vitro and in yeast, and the biophysical evidence for the specific interaction of the compound with the enzyme will set the stage for the development of analogs of this drug that specifically inhibit this enzyme and possibly other PMTs.
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Affiliation(s)
- April M Bobenchik
- Department of Internal Medicine, Section of Infectious Diseases, Yale School of Medicine, 333 Cedar St., New Haven, 06052, USA
- Department of Genetics and Developmental Biology, University of Connecticut Health Center, 263 Farmington Ave., Farmington, 06030, USA
| | - Jae-Yeon Choi
- The Program in Cell Biology, Department of Medicine, National Jewish Medical and Research Center, 1400 Jackson St, Denver, 80206, USA
| | - Arunima Mishra
- Department of Genetics and Developmental Biology, University of Connecticut Health Center, 263 Farmington Ave., Farmington, 06030, USA
| | - Iulian N Rujan
- Department of Molecular, Microbial, and Structural Biology University of Connecticut Health Center, 263 Farmington Ave., Farmington, 06030, USA
| | - Bing Hao
- Department of Molecular, Microbial, and Structural Biology University of Connecticut Health Center, 263 Farmington Ave., Farmington, 06030, USA
| | - Dennis R Voelker
- The Program in Cell Biology, Department of Medicine, National Jewish Medical and Research Center, 1400 Jackson St, Denver, 80206, USA
| | - Jeffrey C Hoch
- Department of Molecular, Microbial, and Structural Biology University of Connecticut Health Center, 263 Farmington Ave., Farmington, 06030, USA
| | - Choukri Ben Mamoun
- Department of Internal Medicine, Section of Infectious Diseases, Yale School of Medicine, 333 Cedar St., New Haven, 06052, USA
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Boobis A, Watelet JB, Whomsley R, Benedetti MS, Demoly P, Tipton K. Drug interactions. Drug Metab Rev 2009; 41:486-527. [PMID: 19601724 DOI: 10.1080/10837450902891550] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Drugs for allergy are often taken in combination with other drugs, either to treat allergy or other conditions. In common with many pharmaceuticals, most such drugs are subject to metabolism by P450 enzymes and to transmembrane transport. This gives rise to considerable potential for drug-drug interactions, to which must be added consideration of drug-diet interactions. The potential for metabolism-based drug interactions is increasingly being taken into account during drug development, using a variety of in silico and in vitro approaches. Prediction of transporter-based interactions is not as advanced. The clinical importance of a drug interaction will depend upon a number of factors, and it is important to address concerns quantitatively, taking into account the therapeutic index of the compound.
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Affiliation(s)
- Alan Boobis
- Department of Experimental Medicine and Toxicology, Division of Medicine, Imperial College London, Hammersmith Campus, London.
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Brignole EJ, Smith S, Asturias FJ. Conformational flexibility of metazoan fatty acid synthase enables catalysis. Nat Struct Mol Biol 2009; 16:190-7. [PMID: 19151726 PMCID: PMC2653270 DOI: 10.1038/nsmb.1532] [Citation(s) in RCA: 83] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2008] [Accepted: 11/14/2008] [Indexed: 11/09/2022]
Abstract
The metazoan cytosolic fatty acid synthase (FAS) contains all of the enzymes required for de novo fatty acid biosynthesis covalently linked around two reaction chambers. Although the three-dimensional architecture of FAS has been mostly defined, it is unclear how reaction intermediates can transfer between distant catalytic domains. Using single-particle EM, we have identified a near continuum of conformations consistent with a remarkable flexibility of FAS. The distribution of conformations was influenced by the presence of substrates and altered by different catalytic mutations, suggesting a direct correlation between conformation and specific enzymatic activities. We interpreted three-dimensional reconstructions by docking high-resolution structures of individual domains, and they show that the substrate-loading and condensation domains dramatically swing and swivel to access substrates within either reaction chamber. Concomitant rearrangement of the beta-carbon-processing domains synchronizes acyl chain reduction in one chamber with acyl chain elongation in the other.
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Affiliation(s)
- Edward J Brignole
- Department of Cell Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, USA
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Farag NA, Mohamed SR, Soliman GA. Design, synthesis, and docking studies of novel benzopyrone derivatives as H1-antihistaminic agents. Bioorg Med Chem 2008; 16:9009-17. [DOI: 10.1016/j.bmc.2008.08.039] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2008] [Revised: 08/04/2008] [Accepted: 08/20/2008] [Indexed: 11/16/2022]
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Rutherford K, Le Trong I, Stenkamp R, Parson W. Crystal Structures of Human 108V and 108M Catechol O-Methyltransferase. J Mol Biol 2008; 380:120-30. [DOI: 10.1016/j.jmb.2008.04.040] [Citation(s) in RCA: 98] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2008] [Revised: 04/14/2008] [Accepted: 04/16/2008] [Indexed: 11/29/2022]
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47
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Peng Y, Feng Q, Wilk D, Adjei AA, Salavaggione OE, Weinshilboum RM, Yee VC. Structural basis of substrate recognition in thiopurine s-methyltransferase. Biochemistry 2008; 47:6216-25. [PMID: 18484748 DOI: 10.1021/bi800102x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Thiopurine S-methyltransferase (TPMT) modulates the cytotoxic effects of thiopurine prodrugs such as 6-mercaptopurine by methylating them in a reaction using S-adenosyl- l-methionine as the donor. Patients with TPMT variant allozymes exhibit diminished levels of protein and/or enzyme activity and are at risk for thiopurine drug-induced toxicity. We have determined two crystal structures of murine TPMT, as a binary complex with the product S-adenosyl- l-homocysteine and as a ternary complex with S-adenosyl- l-homocysteine and the substrate 6-mercaptopurine, to 1.8 and 2.0 A resolution, respectively. Comparison of the structures reveals that an active site loop becomes ordered upon 6-mercaptopurine binding. The positions of the two ligands are consistent with the expected S N2 reaction mechanism. Arg147 and Arg221, the only polar amino acids near 6-mercaptopurine, are highlighted as possible participants in substrate deprotonation. To probe whether these residues are important for catalysis, point mutants were prepared in the human enzyme. Substitution of Arg152 (Arg147 in murine TPMT) with glutamic acid decreases V max and increases K m for 6-mercaptopurine but not K m for S-adenosyl- l-methionine. Substitution at this position with alanine or histidine and similar substitutions of Arg226 (Arg221 in murine TPMT) result in no effect on enzyme activity. The double mutant Arg152Ala/Arg226Ala exhibits a decreased V max and increased K m for 6-mercaptopurine. These observations suggest that either Arg152 or Arg226 may participate in some fashion in the TPMT reaction, with one residue compensating when the other is altered, and that Arg152 may interact with substrate more directly than Arg226, consistent with observations in the murine TPMT crystal structure.
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Affiliation(s)
- Yi Peng
- Department of Biochemistry, Case Western Reserve University, Cleveland, Ohio 44106, USA
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Rutherford K, Parson WW, Daggett V. The histamine N-methyltransferase T105I polymorphism affects active site structure and dynamics. Biochemistry 2007; 47:893-901. [PMID: 18154359 DOI: 10.1021/bi701737f] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Histamine N-methyltransferase (HNMT) is the primary enzyme responsible for inactivating histamine in the mammalian brain. The human HNMT gene contains a common threonine-isoleucine polymorphism at residue 105, distal from the active site. The 105I variant has decreased activity and lower protein levels than the 105T protein. Crystal structures of both variants have been determined but reveal little regarding how the T105I polymorphism affects activity. We performed molecular dynamics simulations for both 105T and 105I at 37 degrees C to explore the structural and dynamic consequences of the polymorphism. The simulations indicate that replacing Thr with the larger Ile residue leads to greater burial of residue 105 and heightened intramolecular interactions between residue 105 and residues within helix alpha3 and strand beta3. This altered, tighter packing is translated to the active site, resulting in the reorientation of several cosubstrate-binding residues. The simulations also show that the hydrophobic histamine-binding domain in both proteins undergoes a large-scale breathing motion that exposes key catalytic residues and lowers the hydrophobicity of the substrate-binding site.
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Affiliation(s)
- Karen Rutherford
- Department of Biochemistry, University of Washington, Box 355061, Seattle, Washington 98195-5061, USA
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El-Hamamsy MHRI, Smith AW, Thompson AS, Threadgill MD. Structure-based design, synthesis and preliminary evaluation of selective inhibitors of dihydrofolate reductase from Mycobacterium tuberculosis. Bioorg Med Chem 2007; 15:4552-76. [PMID: 17451962 DOI: 10.1016/j.bmc.2007.04.011] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2006] [Revised: 04/02/2007] [Accepted: 04/05/2007] [Indexed: 10/23/2022]
Abstract
Tuberculosis is an increasing threat, owing to the spread of AIDS and to the development of resistance of the causative organism, Mycobacterium tuberculosis, to the currently available drugs. Dihydrofolate reductase (DHFR) is an important enzyme of the folate cycle; inhibition of DHFR inhibits growth and causes cell death. The crystal structure of M. tuberculosis DHFR revealed a glycerol tightly bound close to the binding site for the substrate dihydrofolate; this glycerol-binding motif is absent from the human enzyme. A series of pyrimidine-2,4-diamines was designed with a two-carbon tether between a glycerol-mimicking triol and the 6-position of the heterocycle; these compounds also carried aryl substituents at the 5-position. These, their diastereoisomers, analogues lacking two hydroxy groups and analogues lacking the two-carbon spacing linker were synthesised by acylation of the anions derived from phenylacetonitriles with ethyl (4S,5R)-4-benzyloxymethyl-2,2-dimethyl-1,3-dioxolane-4-propanoate, ethyl (4S,5S)-4-benzyloxymethyl-2,2-dimethyl-1,3-dioxolane-4-propanoate, tetrahydrooxepin-2-one and 2,3-O-isopropylidene-d-erythronolactone, respectively, to give the corresponding alpha-acylphenylacetonitriles. Formation of the methyl enol ethers, condensation with guanidine and deprotection gave the pyrimidine-2,4-diamines. Preliminary assay of the abilities of these compounds to inhibit the growth of TB5 Saccharomyces cerevisiae carrying the DHFR genes from M. tuberculosis, human and yeast indicated that 5-phenyl-6-((3R,4S)-3,4,5-trihydroxypentyl)pyrimidine-2,4-diamine selectively inhibited M. tuberculosis DHFR and had little effect on the human or yeast enzymes.
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50
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Histaminergic Involvement in Neuropathic Pain Produced by Partial Ligation of the Sciatic Nerve in Rats. Reg Anesth Pain Med 2007. [DOI: 10.1097/00115550-200703000-00006] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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