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Tschang M, Kumar S, Young W, Schachner M, Theis T. Small Organic Compounds Mimicking the Effector Domain of Myristoylated Alanine-Rich C-Kinase Substrate Stimulate Female-Specific Neurite Outgrowth. Int J Mol Sci 2023; 24:14271. [PMID: 37762575 PMCID: PMC10532424 DOI: 10.3390/ijms241814271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2023] [Revised: 09/15/2023] [Accepted: 09/16/2023] [Indexed: 09/29/2023] Open
Abstract
Myristoylated alanine-rich C-kinase substrate (MARCKS) is a critical member of a signaling cascade that influences disease-relevant neural functions such as neural growth and plasticity. The effector domain (ED) of MARCKS interacts with the extracellular glycan polysialic acid (PSA) through the cell membrane to stimulate neurite outgrowth in cell culture. We have shown that a synthetic ED peptide improves functional recovery after spinal cord injury in female but not male mice. However, peptides themselves are unstable in therapeutic applications, so we investigated more pharmacologically relevant small organic compounds that mimic the ED peptide to maximize therapeutic potential. Using competition ELISAs, we screened small organic compound libraries to identify molecules that structurally and functionally mimic the ED peptide of MARCKS. Since we had shown sex-specific effects of MARCKS on spinal cord injury recovery, we assayed neuronal viability as well as neurite outgrowth from cultured cerebellar granule cells of female and male mice separately. We found that epigallocatechin, amiodarone, sertraline, tegaserod, and nonyloxytryptamine bind to a monoclonal antibody against the ED peptide, and compounds stimulate neurite outgrowth in cultured cerebellar granule cells of female mice only. Therefore, a search for compounds that act in males appears warranted.
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Affiliation(s)
- Monica Tschang
- Keck Center for Collaborative Neuroscience and Department of Cell Biology and Neuroscience, Rutgers University, Piscataway, NJ 08554, USA; (M.T.); (W.Y.)
| | - Suneel Kumar
- Department of Biomedical Engineering, Rutgers, The State University of New Jersey, Piscataway, NJ 08844, USA;
| | - Wise Young
- Keck Center for Collaborative Neuroscience and Department of Cell Biology and Neuroscience, Rutgers University, Piscataway, NJ 08554, USA; (M.T.); (W.Y.)
| | - Melitta Schachner
- Keck Center for Collaborative Neuroscience and Department of Cell Biology and Neuroscience, Rutgers University, Piscataway, NJ 08554, USA; (M.T.); (W.Y.)
| | - Thomas Theis
- Keck Center for Collaborative Neuroscience and Department of Cell Biology and Neuroscience, Rutgers University, Piscataway, NJ 08554, USA; (M.T.); (W.Y.)
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Stachura P, Liu W, Xu HC, Wlodarczyk A, Stencel O, Pandey P, Vogt M, Bhatia S, Picard D, Remke M, Lang KS, Häussinger D, Homey B, Lang PA, Borkhardt A, Pandyra AA. Unleashing T cell anti-tumor immunity: new potential for 5-Nonloxytryptamine as an agent mediating MHC-I upregulation in tumors. Mol Cancer 2023; 22:136. [PMID: 37582744 PMCID: PMC10426104 DOI: 10.1186/s12943-023-01833-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Accepted: 07/27/2023] [Indexed: 08/17/2023] Open
Abstract
BACKGROUND New therapies are urgently needed in melanoma, particularly in late-stage patients not responsive to immunotherapies and kinase inhibitors. To uncover novel potentiators of T cell anti-tumor immunity, we carried out an ex vivo pharmacological screen and identified 5-Nonyloxytryptamine (5-NL), a serotonin agonist, as increasing the ability of T cells to target tumor cells. METHODS The pharmacological screen utilized lymphocytic choriomeningitis virus (LCMV)-primed splenic T cells and melanoma B16.F10 cells expressing the LCMV gp33 CTL epitope. In vivo tumor growth in C57BL/6 J and NSG mice, in vivo antibody depletion, flow cytometry, immunoblot, CRISPR/Cas9 knockout, histological and RNA-Seq analyses were used to decipher 5-NL's immunomodulatory effects in vitro and in vivo. RESULTS 5-NL delayed tumor growth in vivo and the phenotype was dependent on the hosts' immune system, specifically CD8+ T cells. 5-NL's pro-immune effects were not directly consequential to T cells. Rather, 5-NL upregulated antigen presenting machinery in melanoma and other tumor cells in vitro and in vivo without increasing PD-L1 expression. Mechanistic studies indicated that 5-NL's induced MHC-I expression was inhibited by pharmacologically preventing cAMP Response Element-Binding Protein (CREB) phosphorylation. Importantly, 5-NL combined with anti-PD1 therapy showed significant improvement when compared to single anti-PD-1 treatment. CONCLUSIONS This study demonstrates novel therapeutic opportunities for augmenting immune responses in poorly immunogenic tumors.
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Affiliation(s)
- Paweł Stachura
- Department of Molecular Medicine II, Medical Faculty, Heinrich-Heine-University, Universitätsstraße 1, 40225, Düsseldorf, Germany
- Department of Pediatric Oncology, Hematology and Clinical Immunology, Medical Faculty, Center of Child and Adolescent Health, Heinrich-Heine-University, Moorenstrasse 5, 40225, Düsseldorf, Germany
| | - Wei Liu
- Department of Molecular Medicine II, Medical Faculty, Heinrich-Heine-University, Universitätsstraße 1, 40225, Düsseldorf, Germany
| | - Haifeng C Xu
- Department of Molecular Medicine II, Medical Faculty, Heinrich-Heine-University, Universitätsstraße 1, 40225, Düsseldorf, Germany
| | - Agnès Wlodarczyk
- Department of Pediatric Oncology, Hematology and Clinical Immunology, Medical Faculty, Center of Child and Adolescent Health, Heinrich-Heine-University, Moorenstrasse 5, 40225, Düsseldorf, Germany
| | - Olivia Stencel
- Department of Pediatric Oncology, Hematology and Clinical Immunology, Medical Faculty, Center of Child and Adolescent Health, Heinrich-Heine-University, Moorenstrasse 5, 40225, Düsseldorf, Germany
| | - Piyush Pandey
- Department of Molecular Medicine II, Medical Faculty, Heinrich-Heine-University, Universitätsstraße 1, 40225, Düsseldorf, Germany
| | - Melina Vogt
- Department of Pediatric Oncology, Hematology and Clinical Immunology, Medical Faculty, Center of Child and Adolescent Health, Heinrich-Heine-University, Moorenstrasse 5, 40225, Düsseldorf, Germany
| | - Sanil Bhatia
- Department of Pediatric Oncology, Hematology and Clinical Immunology, Medical Faculty, Center of Child and Adolescent Health, Heinrich-Heine-University, Moorenstrasse 5, 40225, Düsseldorf, Germany
| | - Daniel Picard
- Department of Pediatric Oncology, Hematology and Clinical Immunology, Medical Faculty, Center of Child and Adolescent Health, Heinrich-Heine-University, Moorenstrasse 5, 40225, Düsseldorf, Germany
- Division of Pediatric Neuro-Oncogenomics, German Cancer Research Center (DKFZ), Heidelberg, Germany
- Partner Site Essen/Düsseldorf, German Consortium for Translational Cancer Research (DKTK), Düsseldorf, Germany
- Department of Neuropathology, Medical Faculty, Heinrich-Heine University, Moorenstrasse 5, Düsseldorf, 40225, Germany
| | - Marc Remke
- Department of Pediatric Oncology, Hematology and Clinical Immunology, Medical Faculty, Center of Child and Adolescent Health, Heinrich-Heine-University, Moorenstrasse 5, 40225, Düsseldorf, Germany
- Division of Pediatric Neuro-Oncogenomics, German Cancer Research Center (DKFZ), Heidelberg, Germany
- Partner Site Essen/Düsseldorf, German Consortium for Translational Cancer Research (DKTK), Düsseldorf, Germany
- Department of Neuropathology, Medical Faculty, Heinrich-Heine University, Moorenstrasse 5, Düsseldorf, 40225, Germany
| | - Karl S Lang
- Institute of Immunology, Medical Faculty, University of Duisburg-Essen, Hufelandstrasse 55, 45147, Essen, Germany
| | - Dieter Häussinger
- Department of Gastroenterology, Hepatology and Infectious Diseases, Medical Faculty, Heinrich-Heine-University, Moorenstrasse 5, Düsseldorf, 40225, Germany
| | - Bernhard Homey
- Department of Dermatology, Medical Faculty, Heinrich-Heine-University, Moorenstrasse 5, Düsseldorf, 40225, Germany
| | - Philipp A Lang
- Department of Molecular Medicine II, Medical Faculty, Heinrich-Heine-University, Universitätsstraße 1, 40225, Düsseldorf, Germany
| | - Arndt Borkhardt
- Department of Pediatric Oncology, Hematology and Clinical Immunology, Medical Faculty, Center of Child and Adolescent Health, Heinrich-Heine-University, Moorenstrasse 5, 40225, Düsseldorf, Germany
| | - Aleksandra A Pandyra
- Department of Pediatric Oncology, Hematology and Clinical Immunology, Medical Faculty, Center of Child and Adolescent Health, Heinrich-Heine-University, Moorenstrasse 5, 40225, Düsseldorf, Germany.
- Institute of Clinical Chemistry and Clinical Pharmacology, University Hospital Bonn, Venusberg-Campus 1, 53127, Bonn, Germany.
- German Center for Infection Research (DZIF), Partner Site Bonn-Cologne, Bonn, Germany.
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Abstract
Lasmiditan, an antimigraine drug with selective 5-HT1F receptor affinity, prejunctionally inhibits calcitonin gene-related peptide release in peripheral and central trigeminal nerve terminals of rodents. Migraine headache pathophysiology involves trigeminovascular system activation, calcitonin gene-related peptide (CGRP) release, and dysfunctional nociceptive transmission. Triptans are 5-HT1B/1D/(1F) receptor agonists that prejunctionally inhibit trigeminal CGRP release, but their vasoconstrictor properties limit their use in migraine patients with cardiovascular disease. By contrast, lasmiditan is a novel antimigraine and selective 5-HT1F receptor agonist devoid of vasoconstrictor properties. On this basis, this study has investigated the modulation of trigeminal CGRP release by lasmiditan. For this purpose, we have comparatively analysed the inhibition of several components of the trigeminovascular system induced by lasmiditan and sumatriptan through: ex vivo KCl-induced CGRP release from isolated dura mater, trigeminal ganglion, and trigeminal nucleus caudalis of mice; and in vivo dural vasodilation in the rat closed-cranial window model induced by endogenous (electrical stimulation and capsaicin) and exogenous CGRP. The ex vivo release of CGRP was similarly inhibited by sumatriptan and lasmiditan in all trigeminovascular system components. In vivo, intravenous (i.v.) lasmiditan or higher doses of sumatriptan significantly attenuated the vasodilatory responses to endogenous CGRP release, but not exogenous CGRP effects. These data suggest that lasmiditan prejunctionally inhibits CGRP release in peripheral and central trigeminal nerve terminals. Because lasmiditan is a lipophilic drug that crosses the blood–brain barrier, additional central sites of action remain to be determined.
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Wang M, Theis T, Kabat M, Loers G, Agre LA, Schachner M. Functions of Small Organic Compounds that Mimic the HNK-1 Glycan. Int J Mol Sci 2020; 21:ijms21197018. [PMID: 32987628 PMCID: PMC7582369 DOI: 10.3390/ijms21197018] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2020] [Revised: 09/15/2020] [Accepted: 09/22/2020] [Indexed: 12/27/2022] Open
Abstract
Because of the importance of the HNK-1 carbohydrate for preferential motor reinnervation after injury of the femoral nerve in mammals, we screened NIH Clinical Collection 1 and 2 Libraries and a Natural Product library comprising small organic compounds for identification of pharmacologically useful reagents. The reason for this attempt was to obviate the difficult chemical synthesis of the HNK-1 carbohydrate and its isolation from natural sources, with the hope to render such compounds clinically useful. We identified six compounds that enhanced neurite outgrowth from cultured spinal motor neurons at nM concentrations and increased their neurite diameter, but not their neurite branch points. Axons of dorsal root ganglion neurons did not respond to these compounds, a feature that is in agreement with their biological role after injury. We refer to the positive functions of some of these compounds in animal models of injury and delineate the intracellular signaling responses elicited by application of compounds to cultured murine central nervous system neurons. Altogether, these results point to the potential of the HNK-1 carbohydrate mimetics in clinically-oriented settings.
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Affiliation(s)
- Minjuan Wang
- Keck Center for Collaborative Neuroscience and Department of Cell Biology and Neuroscience, Rutgers University, Piscataway, NJ 08554, USA; (M.W.); (T.T.); (M.K.)
| | - Thomas Theis
- Keck Center for Collaborative Neuroscience and Department of Cell Biology and Neuroscience, Rutgers University, Piscataway, NJ 08554, USA; (M.W.); (T.T.); (M.K.)
| | - Maciej Kabat
- Keck Center for Collaborative Neuroscience and Department of Cell Biology and Neuroscience, Rutgers University, Piscataway, NJ 08554, USA; (M.W.); (T.T.); (M.K.)
| | - Gabriele Loers
- Zentrum für Molekulare Neurobiologie Hamburg, Universitätsklinikum Hamburg-Eppendorf, 20251 Hamburg, Germany;
| | - Lynn A. Agre
- Rutgers School of Arts and Sciences, Department of Statistics and Rutgers Business School, Rutgers University, Piscataway, NJ 08854, USA;
| | - Melitta Schachner
- Keck Center for Collaborative Neuroscience and Department of Cell Biology and Neuroscience, Rutgers University, Piscataway, NJ 08554, USA; (M.W.); (T.T.); (M.K.)
- Correspondence: ; Tel.: +1-848-445-1780
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Bouma EM, van de Pol DPI, Sanders ID, Rodenhuis-Zybert IA, Smit JM. Serotonergic Drugs Inhibit Chikungunya Virus Infection at Different Stages of the Cell Entry Pathway. J Virol 2020; 94:e00274-20. [PMID: 32321803 PMCID: PMC7307168 DOI: 10.1128/jvi.00274-20] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Accepted: 04/12/2020] [Indexed: 12/15/2022] Open
Abstract
Chikungunya virus (CHIKV) is an important reemerging human pathogen transmitted by mosquitoes. The virus causes an acute febrile illness, chikungunya fever, which is characterized by headache, rash, and debilitating (poly)arthralgia that can reside for months to years after infection. Currently, effective antiviral therapies and vaccines are lacking. Due to the high morbidity and economic burden in the countries affected by CHIKV, there is a strong need for new strategies to inhibit CHIKV replication. The serotonergic drug 5-nonyloxytryptamine (5-NT) was previously identified as a potential host-directed inhibitor for CHIKV infection. In this study, we determined the mechanism of action by which the serotonin receptor agonist 5-NT controls CHIKV infection. Using time-of-addition and entry bypass assays, we found that 5-NT predominantly inhibits CHIKV in the early phases of the replication cycle, at a step prior to RNA translation and genome replication. Intriguingly, however, no effect was seen during virus-cell binding, internalization, membrane fusion and genomic RNA (gRNA) release into the cell cytosol. In addition, we show that the serotonin receptor antagonist methiothepin mesylate (MM) also has antiviral properties toward CHIKV and specifically interferes with the cell entry process and/or membrane fusion. Taken together, pharmacological targeting of 5-HT receptors may represent a potent way to limit viral spread and disease severity.IMPORTANCE The rapid spread of mosquito-borne viral diseases in humans puts a huge economic burden on developing countries. For many of these infections, including those caused by chikungunya virus (CHIKV), there are no specific treatment possibilities to alleviate disease symptoms. Understanding the virus-host interactions that are involved in the viral replication cycle is imperative for the rational design of therapeutic strategies. In this study, we discovered an antiviral compound, elucidated its mechanism of action, and propose serotonergic drugs as potential host-directed antivirals for CHIKV.
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Affiliation(s)
- Ellen M Bouma
- Department of Medical Microbiology and Infection Prevention, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Denise P I van de Pol
- Department of Medical Microbiology and Infection Prevention, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Ilson D Sanders
- Department of Medical Microbiology and Infection Prevention, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Izabela A Rodenhuis-Zybert
- Department of Medical Microbiology and Infection Prevention, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Jolanda M Smit
- Department of Medical Microbiology and Infection Prevention, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
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6
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Gadgaard C, Jensen AA. Functional characterization of 5-HT 1A and 5-HT 1B serotonin receptor signaling through G-protein-activated inwardly rectifying K + channels in a fluorescence-based membrane potential assay. Biochem Pharmacol 2020; 175:113870. [PMID: 32088264 DOI: 10.1016/j.bcp.2020.113870] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2020] [Accepted: 02/18/2020] [Indexed: 11/15/2022]
Abstract
The 5-HT1A and 5-HT1B serotonin receptors are abundantly expressed in the CNS and constitute validated as well as putative drug targets in a variety of psychiatric and cognitive disorders, alcoholism/addiction, pain and migraine. In the present study we have characterized the functional properties of human 5-HT1A and 5-HT1B stably co-expressed with the human G-protein-activated inwardly rectifying K+ channel 2 (GIRK2) in HEK293 cells in the fluorescence-based FLIPR® Membrane Potential Blue (FMP) assay. Serotonin and other agonists induced robust decreases in fluorescence levels in the 5-HT1A/GIRK2- and 5-HT1B/GIRK2-HEK293 cells in a concentration-dependent manner in the assay, and these responses could be inhibited by selective 5-HT1A/5-HT1B antagonists and by the Gαi/o-protein inhibitor pertussis toxin (PTX). Five additional stable HEK293 cell lines co-expressing 5-HT1A or 5-HT1B with GIRK2 and one of the PTX-insensitive Gαi/o-subunit mutants Gαi1C351I, Gαi2C352I and Gαo1C351I were constructed, and 5-HT1A/5-HT1B-mediated responses through these specific Gαi/o-subunits were measured in these cells pretreated with PTX in the FMP assay. The functional properties of 16 reference 5-HT1 agonists were characterized at the seven cell lines, which constitutes the most detailed pharmacological profiling and comparison of 5-HT1A and 5-HT1B receptor signaling in the same assay published to date. We propose that this approach to assay 5-HT1-mediated signaling through endogenous Gαi/o-proteins in HEK293 cells or through specific Gαi/o-subunits in a fairly high-throughput manner holds some advantages to other functional assays for Gαi/o-coupled receptors. The assay will facilitate detailed profiling of the Gαi/o- and Gβγ-mediated signaling of 5-HT1A and 5-HT1B at the molecular level, and it could also be used to identify novel modulators for the receptors.
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Affiliation(s)
- Camilla Gadgaard
- Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, DK-2100 Copenhagen Ø, Denmark
| | - Anders A Jensen
- Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, DK-2100 Copenhagen Ø, Denmark.
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Ching KC, F P Ng L, Chai CLL. A compendium of small molecule direct-acting and host-targeting inhibitors as therapies against alphaviruses. J Antimicrob Chemother 2018; 72:2973-2989. [PMID: 28981632 PMCID: PMC7110243 DOI: 10.1093/jac/dkx224] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Alphaviruses were amongst the first arboviruses to be isolated, characterized and assigned a taxonomic status. They are globally widespread, infecting a large variety of terrestrial animals, birds, insects and even fish. Moreover, they are capable of surviving and circulating in both sylvatic and urban environments, causing considerable human morbidity and mortality. The re-emergence of Chikungunya virus (CHIKV) in almost every part of the world has caused alarm to many health agencies throughout the world. The mosquito vector for this virus, Aedes, is globally distributed in tropical and temperate regions and capable of thriving in both rural and urban landscapes, giving the opportunity for CHIKV to continue expanding into new geographical regions. Despite the importance of alphaviruses as human pathogens, there is currently no targeted antiviral treatment available for alphavirus infection. This mini-review discusses some of the major features in the replication cycle of alphaviruses, highlighting the key viral targets and host components that participate in alphavirus replication and the molecular functions that were used in drug design. Together with describing the importance of these targets, we review the various direct-acting and host-targeting inhibitors, specifically small molecules that have been discovered and developed as potential therapeutics as well as their reported in vitro and in vivo efficacies.
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Affiliation(s)
- Kuan-Chieh Ching
- NUS Graduate School for Integrative Sciences and Engineering, Centre for Life Sciences, #05-01, 28 Medical Drive, Singapore 117456.,Department of Pharmacy, Faculty of Science, National University of Singapore, Block S4A, Level 3, 18 Science Drive 4, Singapore 117543
| | - Lisa F P Ng
- Singapore Immunology Network, A*STAR, 8A Biomedical Grove, Immunos Building, #04-06, Singapore 138648.,Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Block MD6, Centre for Translational Medicine, 14 Medical Drive, #14-01T, Singapore 117599.,Institute of Infection and Global Health, University of Liverpool, Ronald Ross Building, 8 West Derby Street, Liverpool L697BE, UK
| | - Christina L L Chai
- NUS Graduate School for Integrative Sciences and Engineering, Centre for Life Sciences, #05-01, 28 Medical Drive, Singapore 117456.,Department of Pharmacy, Faculty of Science, National University of Singapore, Block S4A, Level 3, 18 Science Drive 4, Singapore 117543
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Faulkner KC, Hurley KA, Weibel DB. 5-Alkyloxytryptamines are membrane-targeting, broad-spectrum antibiotics. Bioorg Med Chem Lett 2016; 26:5539-5544. [PMID: 27765507 PMCID: PMC5159292 DOI: 10.1016/j.bmcl.2016.10.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2016] [Revised: 10/01/2016] [Accepted: 10/04/2016] [Indexed: 12/17/2022]
Abstract
Antibiotic adjuvant therapy represents an exciting opportunity to enhance the activity of clinical antibiotics by co-dosing with a secondary small molecule. Successful adjuvants decrease the concentration of antibiotics used to defeat bacteria, increase activity (in some cases introducing activity against organisms that are drug resistant), and reduce the frequency at which drug-resistant bacteria emerge. We report that 5-alkyloxytryptamines are a new class of broad-spectrum antibacterial agents with exciting activity as antibiotic adjuvants. We synthesized 5-alkyloxytryptamine analogs and found that an alkyl chain length of 6-12 carbons and a primary ammonium group are necessary for the antibacterial activity of the compounds, and an alkyl chain length of 6-10 carbons increased the membrane permeability of Gram-positive and Gram-negative bacteria. Although several of the most potent analogs also have activity against the membranes of human embryonic kidney cells, we demonstrate that below the minimum inhibitory concentration (MIC)-where mammalian cell toxicity is low-these compounds may be successfully used as adjuvants for chloramphenicol, tetracycline, ciprofloxacin, and rifampicin against clinical strains of Salmonella typhimurium, Acinetobacter baumannii and Staphylococcus aureus, reducing MIC values by as much as several logs.
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Affiliation(s)
- Katherine C Faulkner
- Department of Biochemistry, University of Wisconsin-Madison, 6424A Biochemical Sciences Building, 440 Henry Mall, Madison, WI 53706, USA
| | - Katherine A Hurley
- Department of Biochemistry, University of Wisconsin-Madison, 6424A Biochemical Sciences Building, 440 Henry Mall, Madison, WI 53706, USA
| | - Douglas B Weibel
- Department of Biochemistry, University of Wisconsin-Madison, 6424A Biochemical Sciences Building, 440 Henry Mall, Madison, WI 53706, USA; Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, WI 53706, USA; Department of Biomedical Engineering, University of Wisconsin-Madison, 1550 Engineering Drive, Madison, WI 53706, USA.
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9
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Usman HO, Balaban CD. Distribution of 5-HT 1F Receptors in Monkey Vestibular and Trigeminal Ganglion Cells. Front Neurol 2016; 7:173. [PMID: 27777567 PMCID: PMC5056317 DOI: 10.3389/fneur.2016.00173] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2016] [Accepted: 09/27/2016] [Indexed: 01/03/2023] Open
Abstract
Background Evidence of serotonergic involvement in vestibular pathway contributions to migraine and balance disorders is compelling. Serotonergic 5-HT1B and 5-HT1D receptors are expressed extensively in inner ear ganglia of monkeys and rats. The serotonergic 5-HT1F receptor is also a target of triptans. This study describes its distribution in vestibular and trigeminal ganglia of monkeys. Methods Using primary polyclonal antibodies raised against oligopeptides specific for the human 5-HT1F receptor, neuronal somatic area and intensity of immunoreactive vestibular and trigeminal ganglia were quantified. Results and Discussion Virtually all vestibular and considerable trigeminal ganglia showed positive 5-HT1F receptor immunoreactivity. Inferior and superior vestibular ganglia staining appeared confined to distinct cell regions, varying considerably among cells of different sizes: more intense in small, punctate in some medium and regionally polarized in some large cells. Analyses of average somatic vestibular neuronal immunoreactive intensity identified mainly medium sized cells with high standard deviation of intensity corresponding to punctately stained cells. Less variability occurred in somatic intensity staining and cellular distribution among 5-HT1F receptor immunopositive trigeminal ganglia. Most exhibited similar punctate staining patterns, higher mean somatic immunoreactive intensity and larger neuronal somatic size proportions per size distribution subpopulation compared to vestibular ganglia size distribution populations. Centrally directed vestibular ganglion neuronal processes, cochlear inner hair cells, vestibular hair cells and blood vessels in vestibular maculae and cristae were immunoreactive. The 5-HT1F receptor expression in vestibular ganglia shows complex variable staining intensity patterns associated with cell size of immunopositive neurons, not seen in immunopositive trigeminal ganglia and not previously evident with 5-HT1B and 5-HT1D receptor subtype immunoreactivity in vestibular ganglia. These data motivate exploration of 5-HT1 receptor oligomerization and ligand functional selectivity in differential serotonergic involvement in co-morbidity of migraine and balance disorders. Similar findings in cochlear inner hair cell afferents are applicable to migraine-related tinnitus or hypercusis (phonophobia).
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Affiliation(s)
- Habiba O Usman
- Department of Otolaryngology, University of Pittsburgh , Pittsburgh, PA , USA
| | - Carey D Balaban
- Department of Otolaryngology, University of Pittsburgh, Pittsburgh, PA, USA; Department of Neurobiology, University of Pittsburgh, Pittsburgh, PA, USA; Department of Communication Sciences and Disorders, University of Pittsburgh, Pittsburgh, PA, USA; Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA
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Serotonin Receptor Agonist 5-Nonyloxytryptamine Alters the Kinetics of Reovirus Cell Entry. J Virol 2015; 89:8701-12. [PMID: 26109733 DOI: 10.1128/jvi.00739-15] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2015] [Accepted: 06/17/2015] [Indexed: 01/15/2023] Open
Abstract
UNLABELLED Mammalian orthoreoviruses (reoviruses) are nonenveloped double-stranded RNA viruses that infect most mammalian species, including humans. Reovirus binds to cell surface glycans, junctional adhesion molecule A (JAM-A), and the Nogo-1 receptor (depending on the cell type) and enters cells by receptor-mediated endocytosis. Within the endocytic compartment, reovirus undergoes stepwise disassembly, which is followed by release of the transcriptionally active viral core into the cytoplasm. In a small-molecule screen to identify host mediators of reovirus infection, we found that treatment of cells with 5-nonyloxytryptamine (5-NT), a prototype serotonin receptor agonist, diminished reovirus cytotoxicity. 5-NT also blocked reovirus infection. In contrast, treatment of cells with methiothepin mesylate, a serotonin antagonist, enhanced infection by reovirus. 5-NT did not alter cell surface expression of JAM-A or attachment of reovirus to cells. However, 5-NT altered the distribution of early endosomes with a concomitant impairment of reovirus transit to late endosomes and a delay in reovirus disassembly. Consistent with an inhibition of viral disassembly, 5-NT treatment did not alter infection by in vitro-generated infectious subvirion particles, which bind to JAM-A but bypass a requirement for proteolytic uncoating in endosomes to infect cells. We also found that treatment of cells with 5-NT decreased the infectivity of alphavirus chikungunya virus and coronavirus mouse hepatitis virus. These data suggest that serotonin receptor signaling influences cellular activities that regulate entry of diverse virus families and provides a new, potentially broad-spectrum target for antiviral drug development. IMPORTANCE Identification of well-characterized small molecules that modulate viral infection can accelerate development of antiviral therapeutics while also providing new tools to increase our understanding of the cellular processes that underlie virus-mediated cell injury. We conducted a small-molecule screen to identify compounds capable of inhibiting cytotoxicity caused by reovirus, a prototype double-stranded RNA virus. We found that 5-nonyloxytryptamine (5-NT) impairs reovirus infection by altering viral transport during cell entry. Remarkably, 5-NT also inhibits infection by an alphavirus and a coronavirus. The antiviral properties of 5-NT suggest that serotonin receptor signaling is an important regulator of infection by diverse virus families and illuminate a potential new drug target.
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Loers G, Saini V, Mishra B, Papastefanaki F, Lutz D, Chaudhury S, Ripoll DR, Wallqvist A, Gul S, Schachner M, Kaur G. Nonyloxytryptamine mimics polysialic acid and modulates neuronal and glial functions in cell culture. J Neurochem 2013; 128:88-100. [DOI: 10.1111/jnc.12408] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2013] [Revised: 07/19/2013] [Accepted: 08/12/2013] [Indexed: 01/09/2023]
Affiliation(s)
- Gabriele Loers
- Zentrum für Molekulare Neurobiologie Hamburg; Universitätsklinikum Hamburg-Eppendorf; Hamburg Germany
| | - Vedangana Saini
- Department of Biotechnology; Guru Nanak Dev University; Amritsar Punjab India
| | - Bibhudatta Mishra
- Zentrum für Molekulare Neurobiologie Hamburg; Universitätsklinikum Hamburg-Eppendorf; Hamburg Germany
| | - Florentia Papastefanaki
- Laboratory of Cellular and Molecular Neurobiology; Hellenic Pasteur Institute; Athens Greece
| | - David Lutz
- Zentrum für Molekulare Neurobiologie Hamburg; Universitätsklinikum Hamburg-Eppendorf; Hamburg Germany
| | - Sidhartha Chaudhury
- DoD Biotechnology High Performance Computing Software Applications Institute; Telemedicine and Advanced Technology Research Center; US Army Medical Research and Materiel Command; Fort Detrick Maryland USA
| | - Daniel R. Ripoll
- DoD Biotechnology High Performance Computing Software Applications Institute; Telemedicine and Advanced Technology Research Center; US Army Medical Research and Materiel Command; Fort Detrick Maryland USA
| | - Anders Wallqvist
- DoD Biotechnology High Performance Computing Software Applications Institute; Telemedicine and Advanced Technology Research Center; US Army Medical Research and Materiel Command; Fort Detrick Maryland USA
| | - Sheraz Gul
- European ScreeningPort GmbH; Schnackenburgalle114; Hamburg Germany
| | - Melitta Schachner
- Zentrum für Molekulare Neurobiologie Hamburg; Universitätsklinikum Hamburg-Eppendorf; Hamburg Germany
- Keck Center for Collaborative Neuroscience and Department of Cell Biology and Neuroscience; Rutgers University; Piscataway New Jersey USA
| | - Gurcharan Kaur
- Department of Biotechnology; Guru Nanak Dev University; Amritsar Punjab India
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12
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Nambu H, Fukushima M, Hikichi H, Inoue T, Nagano N, Tahara Y, Nambu T, Ito J, Ogawa Y, Ozaki S, Ohta H. Characterization of metabolic phenotypes of mice lacking GPR61, an orphan G-protein coupled receptor. Life Sci 2011; 89:765-72. [PMID: 21971119 DOI: 10.1016/j.lfs.2011.09.002] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2011] [Revised: 08/22/2011] [Accepted: 08/26/2011] [Indexed: 11/25/2022]
Abstract
AIMS GPR61 is an orphan G protein-coupled receptor whose function remains unknown. The purpose of the present study is to elucidate the importance of GPR61 in metabolism by characterization of GPR61-deficient mice. MAIN METHODS Male GPR61-deficient mice were characterized regarding various metabolic parameters, including food intake, body weight, oxygen consumption, body temperature, locomotor activity, and in a pair feeding study. Hypothalamic gene expression was analyzed using real-time quantitative RT-PCR. KEY FINDINGS GPR61-deficient mice exhibited marked hyperphagia and heavier body weight than wild-type mice. Hyperphagia of GPR61-deficient mice was observed before the differences in body weight became apparent between the genotypes. When body weight difference did become apparent between genotypes, increases in visceral fat pad weight, liver weight, liver triglyceride (TG) content, plasma leptin, and plasma insulin were observed in GPR61-deficient mice, suggesting that GPR61 deficiency caused obesity associated with hyperphagia. Oxygen consumption, body temperature, and locomotor activity were not significantly different between GPR61-deficient and wild-type mice. Pair-fed GPR61-deficient mice had a greater fat mass than wild-type mice despite comparable body weight in both genotypes. The mRNA levels of proopiomelanocortin (POMC) and brain-derived neurotropic factor (BDNF) in the hypothalamus of GPR61-deficient mice were significantly lower than those of wild-type mice. SIGNIFICANCE GPR61-deficient mice exhibited obesity associated with hyperphagia. These findings suggest that GPR61 is involved in the regulation of food intake and body weight, and may be of importance when considering GPR61 as a therapeutic target for obesity or eating disorders.
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Affiliation(s)
- Hirohide Nambu
- Tsukuba Research Institute, Banyu Pharmaceutical Co., Ltd., 3 Okubo, Tsukuba, Ibaraki 300-2611, Japan.
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13
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Zefirova ON, Zefirov NS. Physiologically active compounds interacting with serotonin (5-hydroxytryptamine) receptors. RUSSIAN CHEMICAL REVIEWS 2007. [DOI: 10.1070/rc2001v070n04abeh000654] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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14
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Spadoni G, Bedini A, Guidi T, Tarzia G, Lucini V, Pannacci M, Fraschini F. Towards the Development of Mixed MT1-Agonist/MT2-Antagonist Melatonin Receptor Ligands. ChemMedChem 2006; 1:1099-105. [PMID: 16955531 DOI: 10.1002/cmdc.200600133] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Herein we report attempts to optimize the pharmacological properties of 5-(2-hydroxyethoxy)-N-acetyltryptamine (5-HEAT), a melatonin receptor ligand previously described by us. Several 5-substituted and 2,5-disubstituted N-acyltryptamines were synthesized and evaluated in vitro for the human cloned MT(1) and MT(2) receptors. From this series of N-acyltryptamines the 2-bromo derivative (5 c) retains the interesting efficacy profile of 5-HEAT and shows increased melatonin receptor affinities; it represents one of the first examples of a high-affinity MT(1) agonist/MT(2) antagonist. Some other full agonists for both melatonin receptors which exhibit similar or increased affinity relative to that of melatonin were obtained.
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Affiliation(s)
- Gilberto Spadoni
- Istituto di Chimica Farmaceutica e Tossicologica, Università degli Studi di Urbino Carlo Bo, Piazza Rinascimento 6, Urbino, Italy
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15
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Dukat M, Smith C, Herrick-Davis K, Teitler M, Glennon RA. Binding of tryptamine analogs at h5-HT1E receptors: a structure–affinity investigation. Bioorg Med Chem 2004; 12:2545-52. [PMID: 15110837 DOI: 10.1016/j.bmc.2004.03.026] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2004] [Revised: 03/02/2004] [Accepted: 03/14/2004] [Indexed: 11/30/2022]
Abstract
Structure-affinity requirements for the binding of serotonin (5-HT) analogs at human 5-HT1E receptors were investigated by examining the affinities of >40 tryptamine-related compounds. No tryptamine analog was found to bind with substantially higher affinity than 5-HT. The results indicate that hydrogen bonding plays a key role in the 5-HT1E/receptor interaction. This finding was supported using quantitative structure-activity analysis (QSAR) techniques such as comparative molecular field analysis (CoMFA) and the program QsarIS.
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Affiliation(s)
- Małgorzata Dukat
- Department of Medicinal Chemistry, School of Pharmacy, Virginia Commonwealth University, Richmond, VA 23298, USA
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16
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Auch-Schwelk W, Paetsch I, Krackhardt F, Gräfe M, Hetzer R, Fleck E. Modulation of contractions to ergonovine and methylergonovine by nitric oxide and thromboxane A2 in the human coronary artery. J Cardiovasc Pharmacol 2000; 36:631-9. [PMID: 11065224 DOI: 10.1097/00005344-200011000-00013] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
This study explored the modulatory effects of nitric oxide and thromboxane A2 on contractions to ergonovine and methylergonovine in human coronary arteries. To elucidate the different role of nitric oxide synthase in the response to the ergot alkaloids, the serotonin (5-HT) receptors involved in nitric oxide synthase in the response to the ergot alkaloids, the 5-HT receptors involved in nitric oxide release and the contraction of the vascular smooth muscle were characterized with more selective 5-HT-receptor agonists and antagonists. Rings of human coronary arteries from explanted hearts were suspended in organ chambers for isometric tension recording. After testing for contractile (potassium chloride, 60 mM) and endothelial function (substance P, 10(-8) M), respectively, they were exposed to ergot alkaloids or other agonists in the absence or presence of U 46619 (10(-9) M), or nitro-L-arginine (10(-4) M), or both. Ergonovine and methylergonovine were comparable, weak vasoconstrictors in untreated preparations. Contractions to ergonovine were augmented by U 46619, but not by nitro-L-arginine. Contractions to methylergonovine were augmented only by combining U 46619 and nitro-L-arginine. Serotonin and methylergonovine, but not ergonovine, elicited endothelium-dependent, nitric oxide-mediated relaxations. Nonselective 5-HT(1B/1D)-receptor stimulation caused both contractions and relaxations; selective 5-HT1B stimulation caused relaxations only. In the human coronary artery, contractions to ergonovine are not dependent on NO release but are synergistically augmented by thromboxane. Methylergonovine causes similar effects on the vascular smooth muscle, but contractions are inhibited by the release of NO from the endothelium. The 5-HT receptor on the endothelium appears to be different from the receptor on the vascular smooth muscle, which mediates the contractile response to the ergot alkaloids.
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Affiliation(s)
- W Auch-Schwelk
- Department of Internal Medicine/Cardiology and Cardiac Surgery, German Heart Institute Berlin.
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17
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McDuffie JE, Motley ED, Limbird LE, Maleque MA. 5-hydroxytryptamine stimulates phosphorylation of p44/p42 mitogen-activated protein kinase activation in bovine aortic endothelial cell cultures. J Cardiovasc Pharmacol 2000; 35:398-402. [PMID: 10710124 DOI: 10.1097/00005344-200003000-00008] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
5-Hydroxytryptamine (5-HT) is sequestered and released by endothelial cells, acts as an endothelial cell mitogen, promotes the release of nitric oxide (NO), and has been associated with the p44/p42 mitogen-activated protein kinase (MAPK) cascade. NO also acts as a cell mitogen and promotes signals that culminate in the phosphorylation of MAPK. The aim of this study was to test whether endothelial 5-HT receptors stimulate dual (tyrosyl- and threonyl-) phosphorylation of MAPK through a mitogen-activated protein kinase kinase-1 (MEK-1) and eNOS-dependent pathway in bovine aortic endothelial cells (BAECs). As shown by Western blot analysis, 5-HT and the 5-HT1B-selective agonist 5-nonyloxytryptamine (5-NOT) stimulate time- and concentration-dependent (0.001-10 microM) phosphorylation of MAPK in these cells. The agonist-stimulated phosphorylation of MAPK was blocked by the 5-HT1b-receptor antagonist isamoltane (0.01-10 p3M) and the MEK-1 inhibitor PD 098059 ([2-(2'-amino-3'-methoxy-phenyl)-oxanaphthalen-4-one]; 0.01-10 microM¿. The eNOS inhibitor L-N(omega)-iminoethyl-L-ornithine (L-NIO; 0.01-10 microM) failed to block the 1 microM 5-NOT-stimulated responses. Our findings suggest that the 5-HT receptors (specifically 5-HT1B) mediate signals to MEK-1 and subsequently to MAPK through an eNOS-independent pathway in BAECs.
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Affiliation(s)
- J E McDuffie
- Department of Pathology, University of Michigan Medical School, Ann Arbor 48109, USA.
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18
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Grånäs C, Larhammar D. Identification of an amino acid residue important for binding of methiothepin and sumatriptan to the human 5-HT(1B) receptor. Eur J Pharmacol 1999; 380:171-81. [PMID: 10513577 DOI: 10.1016/s0014-2999(99)00520-8] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Site-directed mutagenesis of the human 5-HT1B receptor was performed to investigate the role of the amino acid residues cysteine 326 and tryptophan 327 in transmembrane region VI and aspartic acid 352 in transmembrane region VII in ligand binding. Binding studies were performed with the antagonist radioligand [3H]GR125743 on mutant and wild-type receptors stably expressed in Chinese hamster ovary cells (CHO)-K1 cells. Substitution of tryptophan 327 by alanine resulted in decreased affinities of all ligands tested. The most prominent changes in affinity were observed for the antagonist methiothepin and the antimigraine drug sumatriptan, which were reduced approximately 300- and 60-fold, respectively. Nevertheless, the affinity of 5-HT remained the same. Replacement of the aspartic acid 352 by alanine reduced high-affinity binding of 5-HT. Substitution of cysteine 326 by alanine had minor effects on ligand binding. Some of these results agree with the results from mutagenesis studies of the corresponding amino acids in other receptors. However, some notable differences also emerge showing that functional roles of individual amino acid residues must be tested experimentally in each receptor subtype.
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Affiliation(s)
- C Grånäs
- Department of Neuroscience, Uppsala University, Sweden.
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Lovren F, Li XF, Lytton J, Triggle C. Functional characterization and m-RNA expression of 5-HT receptors mediating contraction in human umbilical artery. Br J Pharmacol 1999; 127:1247-55. [PMID: 10455272 PMCID: PMC1566120 DOI: 10.1038/sj.bjp.0702647] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
5-HT1-like and 5-HT2 receptors have both been described to mediate contractions to 5-HT in the human umbilical artery (HUA). However, the nature of the 5-HT receptor subtypes is unknown. 2 In isometric force studies with ring preparations of HUA alpha-methyl-5-hydroxytryptamine (alpha-Me-5-HT) and 5-hydroxytryptamine (5-HT) contracted HUA with pED50 values of 8.04 and 7.74, respectively. In the presence of a subthreshold concentration of another vasoconstrictor sumatriptan and 5-nonyloxytryptamine elicited concentration-dependent contractions with pEC50 values of 7.21 and 7.67, respectively. In the presence of the selective 5-HT1B/D receptor antagonist GR127935, contractile responses elicited by sumatriptan and 5-nonyloxytryptamine were competitively antagonized (pKB 9.01 and 9.02, respectively). In the experiments with 5-HT, GR127935 appeared to be non-competitive with shallow Schild plot slopes. The data were fitted with two linear regression lines and the calculated pKB of the high affinity component (8.90) was comparable to that expected for GR127935 at the 5-HT1B/1D receptor. Several 5-HT2 selective receptor antagonists (spiperone, cyproheptadine, pirenperone) competitively inhibited responses to 5-HT. The selective 5-HT2A antagonist ketanserin against sumatriptan and 5-nonyloxytryptamine behaved as a weak antagonist while against 5-HT demonstrated a competitive antagonism (pKB 8.56). Using specific primers for human 5-HT1B, 5-HT1D and 5-HT2A receptor genes, the reverse transcriptase-polymerase chain reaction revealed mRNA expression of 5-HT1B and 5-HT2A receptors in the HUA. The results suggest that the HUA has a functional population of 5-HT1B and 5-HT2A receptor subtypes which are involved in the contractile response to 5-HT. Contractions mediated by 5-HT1B receptors can be 'uncovered' by exposure to other vasoactive agents.
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Affiliation(s)
- Fina Lovren
- Department of Pharmacology & Therapeutics, Faculty of Medicine, University of Calgary, Calgary, Alberta, Canada, T2N 4N1
| | - Xiao-Fang Li
- Department of Biochemistry & Molecular Biology, Faculty of Medicine, University of Calgary, Calgary, Alberta, Canada, T2N 4N1
| | - Jonathan Lytton
- Department of Biochemistry & Molecular Biology, Faculty of Medicine, University of Calgary, Calgary, Alberta, Canada, T2N 4N1
| | - Chris Triggle
- Department of Pharmacology & Therapeutics, Faculty of Medicine, University of Calgary, Calgary, Alberta, Canada, T2N 4N1
- Author for correspondence:
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Perez M, Pauwels P, Palmier C, John GW, Valentin JP, Halazy S. 5-O-Carboxymethyl piperazide derivatives of serotonin: a new class of potent and selective 5-HT1D receptor agonists. Bioorg Med Chem Lett 1995. [DOI: 10.1016/0960-894x(95)00091-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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