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Ospital IA, Táquez Delgado MA, Nicoud MB, Corrêa MF, Borges Fernandes GA, Andrade IW, Lauretta P, Martínez Vivot R, Comba MB, Zanardi MM, Speisky D, Uriburu JL, Fernandes JPS, Medina VA. Therapeutic potential of LINS01 histamine H 3 receptor antagonists as antineoplastic agents for triple negative breast cancer. Biomed Pharmacother 2024; 174:116527. [PMID: 38579399 DOI: 10.1016/j.biopha.2024.116527] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2024] [Revised: 03/23/2024] [Accepted: 03/28/2024] [Indexed: 04/07/2024] Open
Abstract
The aims of this work were to evaluate the expression of histamine H3 receptor (H3R) in triple negative breast cancer (TNBC) samples and to investigate the antitumoral efficacy and safety of the LINS01 series of H3R antagonists, through in silico, in vitro, and in vivo approaches. Antitumor activity of LINS01009, LINS01010, LINS01022, LINS01023 was assayed in vitro in 4T1 and MDA-MB-231 TNBC cells (0.01-100 μM), and in vivo in 4T1 tumors orthotopically established in BALB/c mice (1 or 20 mg/kg). Additionally, H3R expression was assessed in 50 human TNBC samples. We have described a higher H3R mRNA expression in basal-like/TNBC tumors vs. matched normal tissue using TCGA Pan-Cancer Atlas data, and a higher H3R expression in human tumor samples vs. peritumoral tissue evidenced by immunohistochemistry associated with poorer survival. Furthermore, while all the essayed compounds showed antitumoral properties, LINS01022 and LINS01023 exhibited the most potent antiproliferative effects by: i) inducing cell apoptosis and suppressing cell migration in 4T1 and MDA-MB-231 TNBC cells, and ii) inhibiting cell growth in paclitaxel-resistant 4T1 cells (potentiating the paclitaxel antiproliferative effect). Moreover, 20 mg/kg LINS01022 reduced tumor size in 4T1 tumor-bearing mice, exhibiting a safe toxicological profile and potential for druggability estimated by ADME calculations. We conclude that the H3R is involved in the regulation of TNBC progression, offering promising therapeutic potential for the novel LINS01 series of H3R antagonists.
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Affiliation(s)
- Ignacio A Ospital
- Laboratorio de Biología Tumoral e Inflamación, Instituto de Investigaciones Biomédicas (BIOMED), Facultad de Ciencias Médicas, Pontificia Universidad Católica Argentina (UCA), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires 1107, Argentina
| | - Mónica A Táquez Delgado
- Laboratorio de Biología Tumoral e Inflamación, Instituto de Investigaciones Biomédicas (BIOMED), Facultad de Ciencias Médicas, Pontificia Universidad Católica Argentina (UCA), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires 1107, Argentina
| | - Melisa B Nicoud
- Laboratorio de Biología Tumoral e Inflamación, Instituto de Investigaciones Biomédicas (BIOMED), Facultad de Ciencias Médicas, Pontificia Universidad Católica Argentina (UCA), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires 1107, Argentina
| | - Michelle F Corrêa
- Departamento de Ciências Farmacêuticas, Universidade Federal de São Paulo, Diadema, SP, Brazil
| | | | - Isabela W Andrade
- Departamento de Ciências Farmacêuticas, Universidade Federal de São Paulo, Diadema, SP, Brazil
| | - Paolo Lauretta
- Laboratorio de Biología Tumoral e Inflamación, Instituto de Investigaciones Biomédicas (BIOMED), Facultad de Ciencias Médicas, Pontificia Universidad Católica Argentina (UCA), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires 1107, Argentina
| | - Rocío Martínez Vivot
- Laboratorio de Biología Tumoral e Inflamación, Instituto de Investigaciones Biomédicas (BIOMED), Facultad de Ciencias Médicas, Pontificia Universidad Católica Argentina (UCA), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires 1107, Argentina
| | - María Betina Comba
- Instituto de Investigaciones en Ingeniería Ambiental, Química y Biotecnología Aplicada (INGEBIO), Facultad de Química e Ingeniería del Rosario, Pontificia Universidad Católica Argentina (UCA), Rosario 2000, Argentina
| | - María Marta Zanardi
- Instituto de Investigaciones en Ingeniería Ambiental, Química y Biotecnología Aplicada (INGEBIO), Facultad de Química e Ingeniería del Rosario, Pontificia Universidad Católica Argentina (UCA), Rosario 2000, Argentina
| | | | | | - João P S Fernandes
- Departamento de Ciências Farmacêuticas, Universidade Federal de São Paulo, Diadema, SP, Brazil
| | - Vanina A Medina
- Laboratorio de Biología Tumoral e Inflamación, Instituto de Investigaciones Biomédicas (BIOMED), Facultad de Ciencias Médicas, Pontificia Universidad Católica Argentina (UCA), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires 1107, Argentina.
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2
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Watanabe A, Nakajima A, Shiroishi M. Recovery of the histamine H 3 receptor activity lost in yeast cells through error-prone PCR and in vivo selection. Sci Rep 2023; 13:16127. [PMID: 37752220 PMCID: PMC10522717 DOI: 10.1038/s41598-023-43389-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2023] [Accepted: 09/22/2023] [Indexed: 09/28/2023] Open
Abstract
G protein-coupled receptors (GPCRs) are the largest protein family in humans and are important drug targets. Yeast, especially Saccharomyces cerevisiae, is a useful host for modifying the function and stability of GPCRs through protein engineering, which is advantageous for mammalian cells. When GPCRs are expressed in yeast, their function is often impaired. In this study, we performed random mutagenesis using error-prone PCR and then an in vivo screening to obtain mutants that recovered the activity of the human histamine H3 receptor (H3R), which loses its signaling function when expressed in yeast. Four mutations with recovered activity were identified after screening. Three of the mutations were identified near the DRY and NPxxY motifs of H3R, which are important for activation and are commonly found in class A GPCRs. The mutants responded exclusively to the yeast YB1 strain harboring Gi-chimera proteins, showing retention of G protein specificity. Analysis of one of the mutants with recovered activity, C415R, revealed that it maintained its ligand-binding characteristics. The strategy used in this study may enable the recovery of the activity of other GPCRs that do not function in S. cerevisiae and may be useful in creating GPCRs mutants stabilized in their active conformations.
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Affiliation(s)
- Ayami Watanabe
- Department of Biological Science and Technology, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo, 125-8585, Japan
| | - Ami Nakajima
- Department of Biological Science and Technology, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo, 125-8585, Japan
| | - Mitsunori Shiroishi
- Department of Biological Science and Technology, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo, 125-8585, Japan.
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3
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Xu J, Pittenger C. The histamine H3 receptor modulates dopamine D2 receptor-dependent signaling pathways and mouse behaviors. J Biol Chem 2023; 299:104583. [PMID: 36871761 PMCID: PMC10139999 DOI: 10.1016/j.jbc.2023.104583] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2022] [Revised: 02/20/2023] [Accepted: 02/21/2023] [Indexed: 03/06/2023] Open
Abstract
The histamine H3 receptor (H3R) is highly enriched in the spiny projection neurons (SPNs) of the striatum, in both the D1 receptor (D1R)-expressing and D2 receptor (D2R)-expressing populations. A crossantagonistic interaction between H3R and D1R has been demonstrated in mice, both at the behavioral level and at the biochemical level. Although interactive behavioral effects have been described upon coactivation of H3R and D2R, the molecular mechanisms underlying this interaction are poorly understood. Here, we show that activation of H3R with the selective agonist R-(-)-α-methylhistamine dihydrobromide mitigates D2R agonist-induced locomotor activity and stereotypic behavior. Using biochemical approaches and the proximity ligation assay, we demonstrated the existence of an H3R-D2R complex in the mouse striatum. In addition, we examined consequences of simultaneous H3R-D2R agonism on the phosphorylation levels of several signaling molecules using immunohistochemistry. H3R agonist treatment modulated Akt (serine/threonine PKB)-glycogen synthase kinase 3 beta signaling in response to D2R activation via a β-arrestin 2-dependent mechanism in D2R-SPNs but not in D1R-SPNs. Phosphorylation of mitogen- and stress-activated protein kinase 1 and rpS6 (ribosomal protein S6) was largely unchanged under these conditions. As Akt-glycogen synthase kinase 3 beta signaling has been implicated in several neuropsychiatric disorders, this work may help clarify the role of H3R in modulating D2R function, leading to a better understanding of pathophysiology involving the interaction between histamine and dopamine systems.
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Affiliation(s)
- Jian Xu
- Department of Psychiatry, Yale University. ,
| | - Christopher Pittenger
- Department of Psychiatry, Yale University; Department of Psychology, Yale University; Department of Child Study Center, Yale University; Department of Interdepartmental Neuroscience Program, Yale University; Department of Wu-Tsai Institute, Yale University; Department of Center for Brain and Mind Health, Yale University.
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El Khamlichi C, Cobret L, Arrang JM, Morisset-Lopez S. BRET Analysis of GPCR Dimers in Neurons and Non-Neuronal Cells: Evidence for Inactive, Agonist, and Constitutive Conformations. Int J Mol Sci 2021; 22:ijms221910638. [PMID: 34638980 PMCID: PMC8508734 DOI: 10.3390/ijms221910638] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2021] [Revised: 09/24/2021] [Accepted: 09/27/2021] [Indexed: 11/29/2022] Open
Abstract
G-protein-coupled receptors (GPCRs) are dimeric proteins, but the functional consequences of the process are still debated. Active GPCR conformations are promoted either by agonists or constitutive activity. Inverse agonists decrease constitutive activity by promoting inactive conformations. The histamine H3 receptor (H3R) is the target of choice for the study of GPCRs because it displays high constitutive activity. Here, we study the dimerization of recombinant and brain H3R and explore the effects of H3R ligands of different intrinsic efficacy on dimerization. Co-immunoprecipitations and Western blots showed that H3R dimers co-exist with monomers in transfected HEK 293 cells and in rodent brains. Bioluminescence energy transfer (BRET) analysis confirmed the existence of spontaneous H3R dimers, not only in living HEK 293 cells but also in transfected cortical neurons. In both cells, agonists and constitutive activity of the H3R decreased BRET signals, whereas inverse agonists and GTPγS, which promote inactive conformations, increased BRET signals. These findings show the existence of spontaneous H3R dimers not only in heterologous systems but also in native tissues, which are able to adopt a number of allosteric conformations, from more inactive to more active states.
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Affiliation(s)
- Chayma El Khamlichi
- Centre de Biophysique Moléculaire, CNRS UPR 4301, Université d’Orléans, Rue Charles Sadron, CEDEX 2, 45071 Orléans, France; (C.E.K.); (L.C.)
| | - Laetitia Cobret
- Centre de Biophysique Moléculaire, CNRS UPR 4301, Université d’Orléans, Rue Charles Sadron, CEDEX 2, 45071 Orléans, France; (C.E.K.); (L.C.)
| | - Jean-Michel Arrang
- Centre de Psychiatrie et Neurosciences, 2 ter Rue d’Alésia, 75014 Paris, France;
- Institut de Psychiatrie et Neurosciences de Paris, UMR_S1266 INSERM, Université Paris Descartes, 102 Rue de la Santé, 75014 Paris, France
| | - Séverine Morisset-Lopez
- Centre de Biophysique Moléculaire, CNRS UPR 4301, Université d’Orléans, Rue Charles Sadron, CEDEX 2, 45071 Orléans, France; (C.E.K.); (L.C.)
- Institut de Psychiatrie et Neurosciences de Paris, UMR_S1266 INSERM, Université Paris Descartes, 102 Rue de la Santé, 75014 Paris, France
- Correspondence: ; Tel.: +33-238257858
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5
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Riddy DM, Cook AE, Shackleford DM, Pierce TL, Mocaer E, Mannoury la Cour C, Sors A, Charman WN, Summers RJ, Sexton PM, Christopoulos A, Langmead CJ. Drug-receptor kinetics and sigma-1 receptor affinity differentiate clinically evaluated histamine H 3 receptor antagonists. Neuropharmacology 2019; 144:244-255. [PMID: 30359639 DOI: 10.1016/j.neuropharm.2018.10.028] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2018] [Revised: 09/18/2018] [Accepted: 10/19/2018] [Indexed: 02/09/2023]
Abstract
The histamine H3 receptor is a G protein-coupled receptor (GPCR) drug target that is highly expressed in the CNS, where it acts as both an auto- and hetero-receptor to regulate neurotransmission. As such, it has been considered as a relevant target in disorders as varied as Alzheimer's disease, schizophrenia, neuropathic pain and attention deficit hyperactivity disorder. A range of competitive antagonists/inverse agonists have progressed into clinical development, with pitolisant approved for the treatment of narcolepsy. Given the breadth of compounds developed and potential therapeutic indications, we assessed the comparative pharmacology of six investigational histamine H3 agents, including pitolisant, using native tissue and recombinant cells. Whilst all of the compounds tested displayed robust histamine H3 receptor inverse agonism and did not differentiate between the main H3 receptor splice variants, they displayed a wide range of affinities and kinetic properties, and included rapidly dissociating (pitolisant, S 38093-2, ABT-239) and slowly dissociating (GSK189254, JNJ-5207852, PF-3654746) agents. S 38093-2 had the lowest histamine H3 receptor affinity (pKB values 5.7-6.2), seemingly at odds with previously reported, potent in vivo activity in models of cognition. We show here that at pro-cognitive and anti-hyperalgesic/anti-allodynic doses, S 38093-2 preferentially occupies the mouse sigma-1 receptor in vivo, only engaging the histamine H3 receptor at doses associated with wakefulness promotion and neurotransmitter (histamine, ACh) release. Furthermore, pitolisant, ABT-239 and PF-3654746 also displayed appreciable sigma-1 receptor affinity, suggesting that this property differentiates clinically evaluated histamine H3 receptor antagonists and may play a role in their efficacy.
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Affiliation(s)
- Darren M Riddy
- Drug Discovery Biology, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, Victoria, Australia
| | - Anna E Cook
- Drug Discovery Biology, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, Victoria, Australia
| | - David M Shackleford
- Drug Discovery Biology, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, Victoria, Australia
| | - Tracie L Pierce
- Drug Discovery Biology, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, Victoria, Australia
| | - Elisabeth Mocaer
- Institut de Recherches Internationales Servier, 50 Rue Carnot, 92284, Suresnes, France
| | | | - Aurore Sors
- Institut de Recherches Internationales Servier, 50 Rue Carnot, 92284, Suresnes, France
| | - William N Charman
- Drug Discovery Biology, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, Victoria, Australia
| | - Roger J Summers
- Drug Discovery Biology, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, Victoria, Australia
| | - Patrick M Sexton
- Drug Discovery Biology, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, Victoria, Australia
| | - Arthur Christopoulos
- Drug Discovery Biology, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, Victoria, Australia
| | - Christopher J Langmead
- Drug Discovery Biology, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, Victoria, Australia.
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6
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Chen Y, Zhen W, Guo T, Zhao Y, Liu A, Rubio JP, Krull D, Richardson JC, Lu H, Wang R. Histamine Receptor 3 negatively regulates oligodendrocyte differentiation and remyelination. PLoS One 2017; 12:e0189380. [PMID: 29253893 PMCID: PMC5734789 DOI: 10.1371/journal.pone.0189380] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2017] [Accepted: 11/24/2017] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Agents promoting oligodendrocyte precursor cell differentiation have the potential to restore halted and/or delayed remyelination in patients with multiple sclerosis. However, few therapeutic targets have been identified. The objective of this study was to identify novel targets for promotion of remyelination and characterize their activity in vitro and in vivo. METHODS A high-content screening assay with differentiation of primary rat oligodendrocyte precursor cells was used to screen GSK-proprietary annotated libraries for remyelination-promoting compounds. Compounds were further validated in vitro and in vivo models; clinical relevance of target was confirmed in human post-mortem brain sections from patients with MS. RESULTS Of ~1000 compounds screened, 36 promoted oligodendrocyte precursor cell differentiation in a concentration-dependent manner; seven were histamine receptor-3 (H3R) antagonists. Inverse agonists of H3R but not neutral antagonists promoted oligodendrocyte precursor cell (OPC) differentiation. H3R was expressed throughout OPC differentiation; H3R expression was transiently upregulated on Days 3-5 and subsequently downregulated. H3R gene knockdown in OPCs increased the expression of differentiation markers and the number of mature oligodendrocytes. Overexpression of full-length H3R reduced differentiation marker expression and the number of mature cells. H3R inverse agonist GSK247246 reduced intracellular cyclic AMP (cAMP) and downstream cAMP response element-binding protein (CREB) phosphorylation in a dose-dependent manner. Histone deacetylase (HDAC-1) and Hes-5 were identified as key downstream targets of H3R during OPC differentiation. In the mouse cuprizone/rapamycin model of demyelination, systemic administration of brain-penetrable GSK247246 enhanced remyelination and subsequently protected axons. Finally, we detected high H3R expression in oligodendroglial cells from demyelination lesions in human samples of patients with MS, and validated a genetic association between an exonic single nucleotide polymorphism in HRH3 and susceptibility to multiple sclerosis. CONCLUSIONS From phenotypic screening to human genetics, we provide evidence for H3R as a novel therapeutic target to promote remyelination in patients with multiple sclerosis.
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Affiliation(s)
- Yongfeng Chen
- Neuro-immunology Discovery Performance Unit, GSK, Shanghai, China
| | - Wei Zhen
- RD Platform Technology & Science, GSK, Shanghai, China
| | - Tony Guo
- RD Platform Technology & Science, GSK, Shanghai, China
| | - Yonggang Zhao
- Genetics, Projects Clinical Platforms & Sciences, GSK, Stevenage, Herts, United Kingdom
| | - Ailian Liu
- RD Platform Technology & Science, GSK, Shanghai, China
| | - Justin P. Rubio
- Genetics, Projects Clinical Platforms & Sciences, GSK, Stevenage, Herts, United Kingdom
| | - David Krull
- Pathology, RD Platform Technology & Science, GSK, Research Triangle Park, NC, United States of America
| | - Jill C. Richardson
- Neuroinflammation DPU, Neurosciences TAU, GSK, Stevenage, Herts, United Kingdom
| | - Hongtao Lu
- Neuro-immunology Discovery Performance Unit, GSK, Shanghai, China
| | - Ryan Wang
- Neuro-immunology Discovery Performance Unit, GSK, Shanghai, China
- * E-mail:
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García-García M, Liarte S, Gómez-González NE, García-Alcázar A, Pérez-Sánchez J, Meseguer J, Mulero V, García-Ayala A, Chaves-Pozo E. Cimetidine disrupts the renewal of testicular cells and the steroidogenesis in a hermaphrodite fish. Comp Biochem Physiol C Toxicol Pharmacol 2016; 189:44-53. [PMID: 27475025 DOI: 10.1016/j.cbpc.2016.07.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/16/2016] [Revised: 06/29/2016] [Accepted: 07/22/2016] [Indexed: 02/06/2023]
Abstract
The importance of histamine in the physiology of the testis in mammals and reptiles has been recently shown. Histamine receptors (Hrs) are well conserved in fish and are functional in several fish species. We report here for the first time that histamine and the mRNA of Hrh1, Hrh2 and Hrh3 are all present in the gonad of the hermaphrodite teleost fish gilthead seabream. Moreover, cimetidine, which acts in vitro as an agonist of Hrh1 and Hrh2 on this species, was intraperitoneally injected in one and two years old gilthead seabream males. After three and five days of cimetidine injection, we found that this compound differently modified the gonadal hrs transcript levels and affects the testicular cell renewal and the gene expression of steroidogenesis-related molecules as well as the serum steroid levels. Our data point to cimetidine as a reproductive disruptor and elucidate a role for histamine in the gonad of this hermaphrodite fish species through Hr signalling.
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MESH Headings
- Animals
- Cimetidine/toxicity
- Dose-Response Relationship, Drug
- Endocrine Disruptors/toxicity
- Fish Proteins/drug effects
- Fish Proteins/genetics
- Fish Proteins/metabolism
- Gene Expression Regulation/drug effects
- Gonadal Steroid Hormones/biosynthesis
- Hermaphroditic Organisms
- Histamine H2 Antagonists/toxicity
- Male
- Receptors, Histamine H1/drug effects
- Receptors, Histamine H1/genetics
- Receptors, Histamine H1/metabolism
- Receptors, Histamine H2/drug effects
- Receptors, Histamine H2/genetics
- Receptors, Histamine H2/metabolism
- Receptors, Histamine H3/drug effects
- Receptors, Histamine H3/genetics
- Receptors, Histamine H3/metabolism
- Regeneration/drug effects
- Sea Bream/genetics
- Sea Bream/growth & development
- Sea Bream/metabolism
- Signal Transduction/drug effects
- Testis/drug effects
- Testis/metabolism
- Testis/physiopathology
- Time Factors
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Affiliation(s)
- María García-García
- Sección de Microscopía, Servicio de Apoyo a la Investigación, University of Murcia, Murcia 30100, Spain
| | - Sergio Liarte
- Department of Cell Biology and Histology, Faculty of Biology, Regional Campus of International Excellence "Campus Mare Nostrum", University of Murcia, IMIB-Arrixaca, 30100 Murcia, Spain
| | - Nuria E Gómez-González
- Department of Cell Biology and Histology, Faculty of Biology, Regional Campus of International Excellence "Campus Mare Nostrum", University of Murcia, IMIB-Arrixaca, 30100 Murcia, Spain
| | - Alicia García-Alcázar
- Centro Oceanográfico de Murcia, Instituto Español de Oceanografía (IEO), Carretera de la Azohía s/n. Puerto de Mazarrón, 30860 Murcia, Spain
| | - Jaume Pérez-Sánchez
- Nutrigenomics and Fish Growth Endocrinology Group, Institute of Aquaculture of Torre la Sal, IATS-CSIC, 12595 Ribera de Cabanes, Castellón, Spain
| | - José Meseguer
- Department of Cell Biology and Histology, Faculty of Biology, Regional Campus of International Excellence "Campus Mare Nostrum", University of Murcia, IMIB-Arrixaca, 30100 Murcia, Spain
| | - Victoriano Mulero
- Department of Cell Biology and Histology, Faculty of Biology, Regional Campus of International Excellence "Campus Mare Nostrum", University of Murcia, IMIB-Arrixaca, 30100 Murcia, Spain
| | - Alfonsa García-Ayala
- Department of Cell Biology and Histology, Faculty of Biology, Regional Campus of International Excellence "Campus Mare Nostrum", University of Murcia, IMIB-Arrixaca, 30100 Murcia, Spain
| | - Elena Chaves-Pozo
- Centro Oceanográfico de Murcia, Instituto Español de Oceanografía (IEO), Carretera de la Azohía s/n. Puerto de Mazarrón, 30860 Murcia, Spain.
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8
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García-Gálvez AM, Arias-Montaño JA. [Isoforms of the human histamine H3 receptor: Generation, expression in the central nervous system and functional implications]. GAC MED MEX 2016; 152:94-102. [PMID: 26927649] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023] Open
Abstract
Histamine plays a significant role as a neuromodulator in the human central nervous system. Histamine-releasing neurons are exclusively located in the tuberomammillary nucleus of the hypothalamus, project to all major areas of the brain, and participate in functions such as the regulation of sleep/wakefulness, locomotor activity, feeding and drinking, analgesia, learning, and memory. The functional effects of histamine are exerted through the activation of four G protein-coupled receptors (H1, H2, H3 and H4), and in the central nervous system the first three receptors are widely expressed. The H3 receptor (H3R) is found exclusively in neuronal cells, where it functions as auto- and hetero-receptor. One remarkable characteristic of the H3R is the existence of isoforms, generated by alternative splicing of the messenger RNA. For the human H3R, 20 isoforms have been reported; although a significant number lack those regions required for agonist binding or receptor signaling, at least five isoforms appear functional upon heterologous expression. In this work we review the evidence for the generation of human H3R isoforms, their expression, and the available information regarding the functionality of such receptors.
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Affiliation(s)
- Ana Maricela García-Gálvez
- Departamento de Fisiología, Biofísica y Neurociencias, Centro de Investigación y de Estudios Avanzados (Cinvestav), México, D.F., México
| | - José Antonio Arias-Montaño
- Departamento de Fisiología, Biofísica y Neurociencias, Centro de Investigación y de Estudios Avanzados (Cinvestav), México, D.F., México
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9
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Merves J, Chandramouleeswaran PM, Benitez AJ, Muir AB, Lee AJ, Lim DM, Dods K, Mehta I, Ruchelli ED, Nakagawa H, Spergel JM, Wang ML. Altered esophageal histamine receptor expression in Eosinophilic Esophagitis (EoE): implications on disease pathogenesis. PLoS One 2015; 10:e0114831. [PMID: 25723478 PMCID: PMC4344302 DOI: 10.1371/journal.pone.0114831] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2014] [Accepted: 11/14/2014] [Indexed: 12/19/2022] Open
Abstract
Eosinophilic Esophagitis (EoE) is a chronic allergic disorder, whose pathobiology is incompletely understood. Histamine-producing cells including mast cells and basophils have been implicated in EoE. However, very little is currently known about the role of histamine and histamine receptor (HR) expression and signaling in the esophageal epithelium. Herein, we characterized HR (H1R, H2R, H3R, and H4R) expression in human esophageal biopsies and investigate the role of histamine signaling in inducible cytokine expression in human esophageal epithelial cells in vitro. HR expression was quantified in esophageal biopsies from non-EoE control (N = 23), inactive EoE (<15 eos/hpf, N = 26) and active EoE (>15 eos/hpf, N = 22) subjects using qRT-PCR and immunofluorescent localization. HR expression and histamine-mediated cytokine secretion were evaluated in human primary and telomerase-immortalized esophageal epithelial cells. H1R, H2R, and H4R expression were increased in active EoE biopsies compared to inactive EoE and controls. H2R was the most abundantly expressed receptor, and H3R expression was negligible in all 3 cohorts. Infiltrating eosinophils expressed H1R, H2R, and H4R, which contributed to the observed increase in HR in active subjects. H1R and H2R, but not H3R or H4R, were constitutively expressed by primary and immortalized cells, and epithelial histamine stimulation induced GM-CSF, TNFα, and IL-8, but not TSLP or eotaxin-3 secretion. Epithelial priming with the TLR3 ligand poly (I:C) induced H1R and H2R expression, and enhanced histamine-induced GM-CSF, TNFα, and IL-8 secretion. These effects were primarily suppressed by H1R antagonists, but unaffected by H2R antagonism. Histamine directly activates esophageal epithelial cytokine secretion in vitro in an H1R dependent fashion. However, H1R, H2R and H4R are induced in active inflammation in EoE in vivo. While systemic antihistamine (anti-H1R) therapy may not induce clinical remission in EoE, our study suggests that further study of histamine receptor signaling in EoE is warranted and that targeting of additional histamine receptors may lead to novel treatment strategies for this important disease.
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Affiliation(s)
- Jamie Merves
- Division of Gastroenterology, Hepatology, and Nutrition, The Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania, United States of America
- Department of Pediatrics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Prasanna Modayur Chandramouleeswaran
- Division of Gastroenterology, Hepatology, and Nutrition, The Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania, United States of America
| | - Alain J. Benitez
- Division of Gastroenterology, Hepatology, and Nutrition, The Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania, United States of America
| | - Amanda B. Muir
- Division of Gastroenterology, Hepatology, and Nutrition, The Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania, United States of America
- Department of Pediatrics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Anna J. Lee
- Division of Gastroenterology, Hepatology, and Nutrition, The Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania, United States of America
| | - Diana M. Lim
- Division of Gastroenterology, Hepatology, and Nutrition, The Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania, United States of America
| | - Kara Dods
- Division of Gastroenterology, Hepatology, and Nutrition, The Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania, United States of America
| | - Isha Mehta
- Division of Gastroenterology, Hepatology, and Nutrition, The Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania, United States of America
| | - Eduardo D. Ruchelli
- Division of Pathology, The Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania, United States of America
| | - Hiroshi Nakagawa
- Department of Gastroenterology, Hepatology and Nutrition, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Jonathan M. Spergel
- Division of Allergy and Immunology, The Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania, United States of America
- Department of Pediatrics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Mei-Lun Wang
- Division of Gastroenterology, Hepatology, and Nutrition, The Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania, United States of America
- Department of Pediatrics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
- * E-mail:
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10
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Mele T, Jurič DM. Identification and pharmacological characterization of the histamine H3 receptor in cultured rat astrocytes. Eur J Pharmacol 2013; 720:198-204. [PMID: 24432407] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Recently we reported that cultured rat cortical astrocytes express histamine H3 receptor that is functionally coupled to Gi/o proteins and participates to the stimulatory effect of histamine. Due to the lack of data on the distribution of histamine H3 receptors on glial cells we further investigated their presence in cultured astrocytes from different brain regions. Real-time PCR was performed to examine the expression of native histamine H3 receptor in cultured rat astrocytes from cortex,cerebellum, hippocampus and striatum.Double-antigen immunofluorescence staining and[3H]N-α-methylhistamine([3H]NαMH) binding studies were utilized to specifically identify and characterize receptor binding sites in astrocytes. Histamine H3 receptor mRNA was detected in rat astrocytes from all the regions under investigation with the highest levels in striatal astrocytes followed by hippocampal astrocytes and approximately equal levels in cerebellar and cortical astrocytes.Double-antigen immunofluorescence confirmed the presence of histamine H3 receptors on the membrane of all examined astroglial populations.[3H]NαMH bound with high affinity and specificity to an apparently single class of saturable sites on cortical astrocytic membranes(KD¼4.5570.46 nM; Bmax¼5.6370.21 fmol/mg protein)and competition assays with selective agonists and antagonists were consistent with labeling of histamine H3 receptor(range of pKi values 7.50–8.87). Our study confirmed the ability of cultured astrocytes from different rat brain regions to express histamine H3 receptors.The observed diverse distribution of the receptors within various astrocytic populations possibly mirrors their heterogeneity in the brain and indicates their active involvement in histamine-mediated effects.
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Krementsov DN, Wall EH, Martin RA, Subramanian M, Noubade R, Rio RD, Mawe GM, Bond JP, Poynter ME, Blankenhorn EP, Teuscher C. Histamine H(3) receptor integrates peripheral inflammatory signals in the neurogenic control of immune responses and autoimmune disease susceptibility. PLoS One 2013; 8:e62743. [PMID: 23894272 PMCID: PMC3718788 DOI: 10.1371/journal.pone.0062743] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2013] [Accepted: 03/23/2013] [Indexed: 12/15/2022] Open
Abstract
Histamine H3 receptor (Hrh3/H3R) is primarily expressed by neurons in the central nervous system (CNS) where it functions as a presynaptic inhibitory autoreceptor and heteroreceptor. Previously, we identified an H3R-mediated central component in susceptibility to experimental allergic encephalomyelitis (EAE), the principal autoimmune model of multiple sclerosis (MS), related to neurogenic control of blood brain barrier permeability and peripheral T cell effector responses. Furthermore, we identified Hrh3 as a positional candidate for the EAE susceptibility locus Eae8. Here, we characterize Hrh3 polymorphisms between EAE-susceptible and resistant SJL and B10.S mice, respectively, and show that Hrh3 isoform expression in the CNS is differentially regulated by acute peripheral inflammatory stimuli in an allele-specific fashion. Next, we show that Hrh3 is not expressed in any subpopulations of the immune compartment, and that secondary lymphoid tissue is anatomically poised to be regulated by central H3R signaling. Accordingly, using transcriptome analysis, we show that, inflammatory stimuli elicit unique transcriptional profiles in the lymph nodes of H3RKO mice compared to WT mice, which is indicative of negative regulation of peripheral immune responses by central H3R signaling. These results further support a functional link between the neurogenic control of T cell responses and susceptibility to CNS autoimmune disease coincident with acute and/or chronic peripheral inflammation. Pharmacological targeting of H3R may therefore be useful in preventing the development and formation of new lesions in MS, thereby limiting disease progression.
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MESH Headings
- Amino Acid Sequence
- Animals
- Central Nervous System/immunology
- Central Nervous System/metabolism
- Central Nervous System/pathology
- Encephalomyelitis, Autoimmune, Experimental/genetics
- Encephalomyelitis, Autoimmune, Experimental/immunology
- Encephalomyelitis, Autoimmune, Experimental/pathology
- Female
- Gene Expression Regulation
- Genetic Predisposition to Disease/genetics
- Hematopoiesis/genetics
- Hematopoiesis/immunology
- Humans
- Inflammation/genetics
- Inflammation/immunology
- Inflammation/pathology
- Intracellular Space/metabolism
- Lymph Nodes/immunology
- Male
- Mice
- Molecular Sequence Data
- Polymorphism, Single Nucleotide
- Protein Isoforms/chemistry
- Protein Isoforms/genetics
- Protein Structure, Tertiary
- Receptors, Histamine H3/chemistry
- Receptors, Histamine H3/genetics
- Signal Transduction/genetics
- Signal Transduction/immunology
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Affiliation(s)
- Dimitry N. Krementsov
- Department of Medicine, Immunobiology Program, University of Vermont, Burlington, Vermont, United States of America
| | - Emma H. Wall
- Department of Medicine, Immunobiology Program, University of Vermont, Burlington, Vermont, United States of America
| | - Rebecca A. Martin
- Department of Medicine, Immunobiology Program, University of Vermont, Burlington, Vermont, United States of America
| | - Meenakumari Subramanian
- Department of Medicine, Immunobiology Program, University of Vermont, Burlington, Vermont, United States of America
| | - Rajkumar Noubade
- Department of Medicine, Immunobiology Program, University of Vermont, Burlington, Vermont, United States of America
| | - Roxana Del Rio
- Department of Medicine, Immunobiology Program, University of Vermont, Burlington, Vermont, United States of America
| | - Gary M. Mawe
- Department of Medicine, Immunobiology Program, University of Vermont, Burlington, Vermont, United States of America
| | - Jeffrey P. Bond
- Department of Medicine, Immunobiology Program, University of Vermont, Burlington, Vermont, United States of America
| | - Matthew E. Poynter
- Department of Medicine, Immunobiology Program, University of Vermont, Burlington, Vermont, United States of America
| | - Elizabeth P. Blankenhorn
- Department of Microbiology and Immunology, Drexel University College of Medicine, Philadelphia, Pennsylvania, United States of America
| | - Cory Teuscher
- Department of Medicine, Immunobiology Program, University of Vermont, Burlington, Vermont, United States of America
- Department of Pathology, University of Vermont, Burlington, Vermont, United States of America
- * E-mail:
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12
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He P, Tan L, Hu W, Dai H, Hu Y, Chen Z. [Identification of a HEK-293 cell line containing stably-transfected H3R gene and screening for novel non-imidazole histamine H3 receptor antagonists]. Zhejiang Da Xue Xue Bao Yi Xue Ban 2013; 42:276-282. [PMID: 23801615] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
OBJECTIVE To identify a HEK293 cell line containing stably-transfected H3R gene, and to screen the novel non-imidazole compounds with H3R antagonist activity. METHODS The expression of rat H3 receptor in cell line was detected by RT-PCR and Western blot. An elevation of intercellular cAMP concentration induced by forskolin was measured as the index for screening compounds with H3R antagonist activity. RESULTS The H3R-transfected HEK-293 cells stably expressed high level of rat H3 receptor mRNA and protein. Forskolin significantly increased intercellular cAMP concentration in the H3R-transfected HEK-293 cells. H3R agonist (R)-α-methylhistamine inhibited the forskolin-induced production of intercellular cAMP. H3R antagonist thioperamide and newly synthesized non-imidazole compounds XHA23 and XHA25 blocked (R)-α- methylhistamine reversal of forskolin-induced cAMP formation in a concentration-dependent manner, and the IC50 values were 3.62 μmol/L, 0.49 μmol/L, 0.14 μmol/L, respectively. CONCLUSION The H3R-transfected HEK293 cells stably express high level of rat H3 receptor, and can be used for screening compounds with H3R antagonist activity. The non-imidazole compounds XHA23 and XHA25 may have H3R antagonist activity.
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Affiliation(s)
- Ping He
- Department of Pharmacy, the Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou 310009, China
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13
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Shi Y, Sheng R, Zhong T, Xu Y, Chen X, Yang D, Sun Y, Yang F, Hu Y, Zhou N. Identification and characterization of ZEL-H16 as a novel agonist of the histamine H3 receptor. PLoS One 2012; 7:e42185. [PMID: 22870296 PMCID: PMC3411647 DOI: 10.1371/journal.pone.0042185] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2012] [Accepted: 07/02/2012] [Indexed: 11/18/2022] Open
Abstract
The histamine H3 receptor (H3R) has been recognized as a promising target for the treatment of various central and peripheral nervous system diseases. In this study, a non-imidazole compound, ZEL-H16, was identified as a novel histamine H3 receptor agonist. ZEL-H16 was found to bind to human H3R with a Ki value of approximately 2.07 nM and 4.36 nM to rat H3R. Further characterization indicated that ZEL-H16 behaved as a partial agonist on the inhibition of forskolin-stimulated cAMP accumulation (the efficacy was 60% of that of histamine) and activation of ERK1/2 signaling (the efficacy was 50% of that of histamine) at H3 receptors, but acted as a full agonist just like histamin in the guinea-pig ileum contraction assay. These effects were blocked by pertussis toxin and H3 receptor specific antagonist thioperamide. ZEL-H16 showed no agonist or antagonist activities at the cloned human histamine H1, H2, and H4 receptors and other biogenic amine GPCRs in the CRE-driven reporter assay. Furthermore, our present data demonstrated that treatment of ZEL-H16 resulted in intensive H3 receptor internalization and delayed recycling to the cell surface as compared to that of control with treatment of histamine. Thus, ZEL-H16 is a novel and potent nonimidazole agonist of H3R, which might serve as a pharmacological tool for future investigations or as possible therapeutic agent of H3R.
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Affiliation(s)
- Ying Shi
- College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang Province, China
| | - Rong Sheng
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, Zhejiang Province, China
| | - Tingting Zhong
- College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang Province, China
| | - Yu Xu
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, Zhejiang Province, China
| | - Xiaopan Chen
- College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang Province, China
| | - Dong Yang
- College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang Province, China
| | - Yi Sun
- College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang Province, China
| | - Fenyan Yang
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, Zhejiang Province, China
| | - Yongzhou Hu
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, Zhejiang Province, China
- * E-mail: (NZ); (YH)
| | - Naiming Zhou
- College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang Province, China
- * E-mail: (NZ); (YH)
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14
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Cavić M, Lluís C, Moreno E, Bakešová J, Canela EI, Navarro G. Production of functional recombinant G-protein coupled receptors for heteromerization studies. J Neurosci Methods 2011; 199:258-64. [PMID: 21658412 DOI: 10.1016/j.jneumeth.2011.05.021] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2011] [Accepted: 05/24/2011] [Indexed: 11/17/2022]
Abstract
G-protein-coupled receptors (GPCRs) represent a diverse protein family of receptors that transduce signals from the extracellular surrounding to intracellular signaling molecules evoking various cellular responses. It is now widely accepted that GPCRs are expressed and function as dimers or most probably as oligomers of more than two receptor protomers. The heteromer has different biochemical and pharmacological characteristics from the monomers, which increases the functional responses of GPCRs. GPCRs are involved in many diseases, and are also the target of around half of all modern medicinal drugs. In the case of Parkinson's disease, a degenerative process caused by gradual disappearance of dopaminergic nigrostriatal neurons, it is suspected that the targets for treatment should be dopamine-receptor-containing heteromers. Technologies based on the use of fluorescent- or luminescent-fused receptors and adaptations of resonance energy transfer (RET) techniques have been useful in investigating the functional inter-relationships between receptors in a heteromer. In this study functional recombinant adenosine A(2A)-Rluc, dopamine D(2)-GFP(2) and histamine H(3)-YFP receptor fusion proteins were successfully cloned and characterized, producing the essential basis for heteromerization studies between these receptors. This might provide a better insight into their pharmacological and functional inter-relationships in the brain and enable the design and evaluation of new therapeutic strategies for Parkinson's disease.
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MESH Headings
- Animals
- Bacterial Proteins/genetics
- CHO Cells
- Cricetinae
- Cricetulus
- Dopamine Agonists/pharmacology
- Drug Design
- Green Fluorescent Proteins/genetics
- HEK293 Cells
- Humans
- Luminescent Proteins/genetics
- Parkinson Disease/drug therapy
- Parkinson Disease/metabolism
- Protein Multimerization/genetics
- Receptor, Adenosine A2A/chemistry
- Receptor, Adenosine A2A/genetics
- Receptor, Adenosine A2A/isolation & purification
- Receptors, Dopamine D2/chemistry
- Receptors, Dopamine D2/genetics
- Receptors, Dopamine D2/isolation & purification
- Receptors, G-Protein-Coupled/chemistry
- Receptors, G-Protein-Coupled/genetics
- Receptors, G-Protein-Coupled/isolation & purification
- Receptors, Histamine H3/chemistry
- Receptors, Histamine H3/genetics
- Receptors, Histamine H3/isolation & purification
- Recombinant Fusion Proteins/chemical synthesis
- Recombinant Fusion Proteins/genetics
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Affiliation(s)
- Milena Cavić
- Department of Experimental Oncology, Institute of Oncology and Radiology of Serbia, Pasterova 14, 11000 Belgrade, Serbia.
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15
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Henry MB, Zheng S, Duan C, Patel B, Vassileva G, Sondey C, Lachowicz J, Hwa JJ. Antidiabetic properties of the histamine H3 receptor protean agonist proxyfan. Endocrinology 2011; 152:828-35. [PMID: 21239440 DOI: 10.1210/en.2010-0757] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Proxyfan is a histamine H3 receptor protean agonist that can produce a spectrum of pharmacological effects including agonist, inverse agonist, and antagonist. We have discovered that proxyfan (10 mg/kg orally) significantly improved glucose excursion after an ip glucose tolerance test in either lean or high-fat/cholesterol diet-induced obese mice. It also reduced plasma glucose levels comparable to that of metformin (300 mg/kg orally) in a nongenetic type 2 diabetes mouse model. The dose-dependent decrease in glucose excursion correlated with inhibition of ex vivo H3 receptor binding in the cerebral cortex. In addition, glucose levels were significantly reduced compared with vehicle-treated mice after intracerebroventricular administration of proxyfan, suggesting the involvement of central H3 receptors. Proxyfan-induced reduction of glucose excursion was not observed in the H3 receptor knockout mice, suggesting that proxyfan mediates this effect through H3 receptors. Proxyfan reduced glucose excursion by significantly increasing plasma insulin levels in a glucose-independent manner. However, no difference in insulin sensitivity was observed in proxyfan-treated mice. The H1 receptor antagonist chlorpheniramine and the H2 receptor antagonist zolantidine had modest effects on glucose excursion, and neither inhibited the glucose excursion reduced by proxyfan. The H3 receptor antagonist/inverse agonist, thioperamide, had weaker effects on glucose excursion compared with proxyfan, whereas the H3 receptor agonist imetit did not affect glucose excursion. In conclusion, these findings demonstrate, for the first time, that manipulation of central histamine H3 receptor by proxyfan can significantly improve glucose excursion by increasing plasma insulin levels via a glucose-independent mechanism.
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Affiliation(s)
- Melanie B Henry
- Diabetes/Obesity Research, Merck Research Laboratories, Kenilworth, New Jersey 07033, USA
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16
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Abstract
BACKGROUND The H3 histamine receptor is a Gi-coupled GPCR that has been proven to exist in different agonist-induced states, including that defined by the protean agonist proxyfan. Several GPCRs are now known to exist in different states. For some of these, antagonist affinity measurement remain constant regardless of the state of the receptor, for others e.g. the beta-adrenoceptors, the antagonist affinity measurements vary considerably depending on which agonist-dependent state is being identified. The purpose of this study was to examine the antagonist affinity measurements at the Gi-coupling human H3 receptor, paying particular attention to measurements made in the presence of full agonists, partial agonists and the proxyfan protean agonist-induced state of the receptor. RESULTS CHO cells stably expressing the human histamine H3 receptor and a CRE-SPAP reporter were used. Measurements of CRE-gene transcription and 3H-cAMP accumulation were made. A range of ligands of different agonist efficacies were determined, including some partial agonists e.g. VUF 5681. Unlike other Gi-coupled receptors, no Gs-coupled state of the receptor was detected with these ligands. Antagonist affinity measurements were constant, whether the measurements were made in the presence of a full agonist, a partial agonist or the protean agonist proxyfan. CONCLUSION In contrast to all three subtypes of the beta-adrenoceptors, but in keeping with the traditional pharmacological dogma, antagonist affinity measurements remained constant at the human H3 receptor, including the medium-efficacy proxyfan-induced state of the receptor and the VUF5681-induced state of the receptor.
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Affiliation(s)
- Jillian G Baker
- Institute of Cell Signalling, Medical School, University of Nottingham, Queen's Medical Centre, Nottingham, NG7 2UH, UK.
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17
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Herwig A, Ivanova EA, Lydon H, Barrett P, Steinlechner S, Loudon AS. Histamine H3 receptor and orexin A expression during daily torpor in the Djungarian hamster (Phodopus sungorus). J Neuroendocrinol 2007; 19:1001-7. [PMID: 18001330 DOI: 10.1111/j.1365-2826.2007.01620.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Seasonal animals use different strategies to reduce energy expenditure in the face of reduced seasonal food availability. For example, the ground squirrel enters a hibernation state with reduced metabolism, hypothermia and suppressed central nervous system activity, whereas the Djungarian hamster (Phodopus sungorus) employs daily bouts of torpor associated with reduced body temperature and energy expenditure. Studies in the hibernating ground squirrel implicate an increase in histamine synthesis and histamine H(3) receptor expression in the brain as a central mechanism governing hibernation. In the present study, we demonstrate an up-regulation of H(3) receptors in several brain nuclei in the Djungarian hamster during bouts of daily torpor, a shallow form of hypothermia, suggesting that histaminergic pathways may play a general role in maintaining low body temperature and torpor state in mammals. These regions include the arcuate nucleus, dorsomedial hypothalamus, suprachiasmatic nucleus, dorsal lateral geniculate nucleus and tuberomammillary nucleus. Interestingly, expression of the mRNA for orexins, a group of neuropeptides that increase wakefulness, remains unchanged during the arousal from daily torpor, suggesting that this classic 'arousal' pathway is not involved in the transition from a hypothermic to the euthermic state.
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Affiliation(s)
- A Herwig
- Institute of Zoology, University of Veterinary Medicine, Hannover, Germany
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18
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Bongers G, Krueger KM, Miller TR, Baranowski JL, Estvander BR, Witte DG, Strakhova MI, van Meer P, Bakker RA, Cowart MD, Hancock AA, Esbenshade TA, Leurs R. An 80-amino acid deletion in the third intracellular loop of a naturally occurring human histamine H3 isoform confers pharmacological differences and constitutive activity. J Pharmacol Exp Ther 2007; 323:888-98. [PMID: 17855474 DOI: 10.1124/jpet.107.127639] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
In this article, we pharmacologically characterized two naturally occurring human histamine H3 receptor (hH3R) isoforms, hH3R(445) and hH3R(365). These abundantly expressed splice variants differ by a deletion of 80 amino acids in the intracellular loop 3. In this report, we show that the hH3R(365) is differentially expressed compared with the hH3R(445) and has a higher affinity and potency for H3R agonists and conversely a lower potency and affinity for H3R inverse agonists. Furthermore, we show a higher constitutive signaling of the hH3R(365) compared with the hH3R(445) in both guanosine-5'-O-(3-[35S]thio) triphosphate binding and cAMP assays, likely explaining the observed differences in hH3R pharmacology of the two isoforms. Because H3R ligands are beneficial in animal models of obesity, epilepsy, and cognitive diseases such as Alzheimer's disease and attention deficit hyperactivity disorder and currently entered clinical trails, these differences in H3R pharmacology of these two isoforms are of great importance for a detailed understanding of the action of H3R ligands.
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Affiliation(s)
- Gerold Bongers
- Leiden/Amsterdam Center for Drug Research, Department of Medicinal Chemistry, Vrije Universiteit Amsterdam, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
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19
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Bongers G, Sallmen T, Passani MB, Mariottini C, Wendelin D, Lozada A, Marle AV, Navis M, Blandina P, Bakker RA, Panula P, Leurs R. The Akt/GSK-3beta axis as a new signaling pathway of the histamine H(3) receptor. J Neurochem 2007; 103:248-58. [PMID: 17623045 DOI: 10.1111/j.1471-4159.2007.04752.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Drugs targeting the histamine H(3) receptor (H(3)R) are suggested to be beneficial for the treatment of neurodegenerative diseases, such as Alzheimer's and Parkinson's disease. The H(3)R activates G(i/o)-proteins to inhibit adenylyl cyclase activity and modulates phospholipase A(2) and MAPK activity. Herein we show that, in transfected SK-N-MC cells, the H(3)R modulates the activity of the Akt/Glycogen synthase kinase 3beta (GSK-3beta) axis both in a constitutive and agonist-dependent fashion. H(3)R stimulation with the H(3)R agonist immepip induces the phosphorylation of both Ser473 and Thr308 on Akt, a serine/threonine kinase that is important for neuronal development and function. The H(3)R-mediated activation of Akt can be inhibited by the H(3)R inverse agonist thioperamide, and by Wortmannin, LY294002 and PTX, suggesting the observed Akt activation occurs via a G(i/o)-mediated activation of phosphoinositide-3-kinase. H(3)R activation also results in the phosphorylation of Ser9 on GSK-3beta, which acts downstream of Akt and has a prominent role in brain function. In addition, we show the H(3)R-mediated phosphorylation of Akt at Ser473 to occur in primary rat cortical neurons and in rat brain slices. The discovery of this signaling property of the H(3)R adds new understanding to the roles of histamine and the H(3)R in brain function and pathology.
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Affiliation(s)
- Gerold Bongers
- Leiden/Amsterdam Center for Drug Research, Department of Medicinal Chemistry, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
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20
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Shaw JB, Cai Q, Mtshali C, Myles EL, Washington B. Heterogeneity of histamine H3 receptor genomic expression in the cerebral cortex of spontaneously hypertensive rat. Cell Mol Biol (Noisy-le-grand) 2007; 53:45-50. [PMID: 17531160] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2006] [Accepted: 10/27/2006] [Indexed: 05/15/2023]
Abstract
Specific binding of [3H]-N-alpha-methylhistamine to homogenates from cerebral cortex tissue was analyzed in aged Wistar Kyoto (WKY) and Spontaneously Hypertensive rats (SHR). Scatchard plot analysis of [3H]-N-alpha-methylhistamine binding of the H3 receptor in the cerebral cortex from aged (6, 9, 12, and 16 week) SHR animals indicated that Bmax increased, respectively, 38.05 +/- 1.58, 59.63 +/- 2.48, 79.17 +/- 5.02, and 84.41 +/- 3.72 fmol/mg of protein. Binding studies using tissue from WKY rats indicated that maximal binding (Bmax) of the ligand to the receptor was not significantly altered. The analyses also yielded Kd values of 5, 7.2, 6.3 and 3.8 nM in SHR tissue respectively. Primers based on the sequence of the third intracellular loop of the H3 receptor were amplified at 35 cycles yielding several amplicons. These amplicons expressed sizes 875, 485, and 280 bp in 6 and 9 week cortical tissue from WKY animals where as in cortical tissue from 6 and 9 week SHR animals only two amplicons were expressed, 485 and 280 bp, respectively. Differences in gene expression for 12 and 16 week WKY and SHR rats were also compared using identical primers. Five amplicons were expressed in cortical tissue from 12 and 16 week WKY rats with 1000, 900, 821, 485, and 430 bp where as in 12 and 16 week SHR animals only one amplicon was expressed at 485 bp. The present results imply (1) that H3 receptor density in cortical tissue of SHR animals increases with age where as the number of the expressed amplicons of the detected H3 receptor decreases; and (2) even though a decrease in number of expressed amplicons of the H3 receptor were observed, an increase in expression of the larger amplicon (~500 bp) is evident.
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Affiliation(s)
- J B Shaw
- Department of Biological Sciences, Tennessee State University, Nashville, TN 37209, USA
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21
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Francis H, Franchitto A, Ueno Y, Glaser S, DeMorrow S, Venter J, Gaudio E, Alvaro D, Fava G, Marzioni M, Vaculin B, Alpini G. H3 histamine receptor agonist inhibits biliary growth of BDL rats by downregulation of the cAMP-dependent PKA/ERK1/2/ELK-1 pathway. J Transl Med 2007; 87:473-87. [PMID: 17334413 PMCID: PMC3751000 DOI: 10.1038/labinvest.3700533] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Histamine regulates many functions by binding to four histamine G-coupled receptor proteins (H1R, H2R, H3R and H4R). As H3R exerts their effects by coupling to Galpha(i/o) proteins reducing adenosine 3', 5'-monophosphate (cAMP) levels (a key player in the modulation of cholangiocyte hyperplasia/damage), we evaluated the role of H3R in the regulation of biliary growth. We posed the following questions: (1) Do cholangiocytes express H3R? (2) Does in vivo administration of (R)-(alpha)-(-)-methylhistamine dihydrobromide (RAMH) (H3R agonist), thioperamide maleate (H3R antagonist) or histamine, in the absence/presence of thioperamide maleate, to bile duct ligated (BDL) rats regulate cholangiocyte proliferation? and (3) Does RAMH inhibit cholangiocyte proliferation by downregulation of cAMP-dependent phosphorylation of protein kinase A (PKA)/extracellular signal-regulated kinase 1/2 (ERK1/2)/ets-like gene-1 (Elk-1)? The expression of H3R was evaluated in liver sections by immunohistochemistry and immunofluorescence, and by real-time PCR in cholangiocyte RNA from normal and BDL rats. BDL rats (immediately after BDL) were treated daily with RAMH, thioperamide maleate or histamine in the absence/presence of thioperamide maleate for 1 week. Following in vivo treatment of BDL rats with RAMH for 1 week, and in vitro stimulation of BDL cholangiocytes with RAMH, we evaluated cholangiocyte proliferation, cAMP levels and PKA, ERK1/2 and Elk-1 phosphorylation. Cholangiocytes from normal and BDL rats express H3R. The expression of H3R mRNA increased in BDL compared to normal cholangiocytes. Histamine decreased cholangiocyte growth of BDL rats to a lower extent than that observed in BDL RAMH-treated rats; histamine-induced inhibition of cholangiocyte growth was partly blocked by thioperamide maleate. In BDL rats treated with thioperamide maleate, cholangiocyte hyperplasia was slightly higher than that of BDL rats. In vitro, RAMH inhibited the proliferation of BDL cholangiocytes. RAMH inhibition of cholangiocyte growth was associated with decreased cAMP levels and PKA/ERK1/2/Elk-1 phosphorylation. Downregulation of cAMP-dependent PKA/ERK1/2/Elk-1 phosphorylation (by activation of H3R) is important in the inhibition of cholangiocyte growth in liver diseases.
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MESH Headings
- Animals
- Bile Ducts/surgery
- Bile Ducts, Intrahepatic/drug effects
- Bile Ducts, Intrahepatic/growth & development
- Bile Ducts, Intrahepatic/pathology
- Cell Proliferation/drug effects
- Cyclic AMP/metabolism
- Cyclic AMP-Dependent Protein Kinases
- Disease Models, Animal
- Down-Regulation/drug effects
- Drug Therapy, Combination
- Gene Expression Regulation, Enzymologic/drug effects
- Histamine/pharmacology
- Histamine Agonists/pharmacology
- Hyperplasia/chemically induced
- Hyperplasia/pathology
- Ligation
- Liver/drug effects
- Liver/metabolism
- Liver/pathology
- MAP Kinase Signaling System
- Male
- Methylhistamines/pharmacology
- Mitogen-Activated Protein Kinase 1/metabolism
- Mitogen-Activated Protein Kinase 3/metabolism
- Mitogen-Activated Protein Kinases/metabolism
- Phosphorylation
- Piperidines/pharmacology
- Protein Serine-Threonine Kinases/metabolism
- Rats
- Rats, Inbred F344
- Receptor, EphA8/metabolism
- Receptors, Histamine H3/genetics
- Receptors, Histamine H3/metabolism
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Affiliation(s)
- Heather Francis
- Department of Research and Education, College of Medicine, Scott & White Hospital and The Texas A & M University System Health Science Center, Temple, TX 76504, USA
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22
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Bonaventure P, Letavic M, Dugovic C, Wilson S, Aluisio L, Pudiak C, Lord B, Mazur C, Kamme F, Nishino S, Carruthers N, Lovenberg T. Histamine H3 receptor antagonists: From target identification to drug leads. Biochem Pharmacol 2007; 73:1084-96. [PMID: 17129577 DOI: 10.1016/j.bcp.2006.10.031] [Citation(s) in RCA: 118] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2006] [Revised: 10/19/2006] [Accepted: 10/31/2006] [Indexed: 11/22/2022]
Abstract
The successful cloning and functional expression of the histamine H(3) receptor in the late 1990 s has greatly facilitated our efforts to identify small molecule, non-imidazole based compounds to permit the evaluation of H(3) antagonists in models of CNS disorders. High-throughput screening identified several series of lead compounds, including a series of imidazopyridines, which led to JNJ-6379490, a compound with high affinity for the human H(3) receptor. Analysis of structural features common to several series of non-imidazole H(3) receptor ligands resulted in a pharmacophore model. This model led to the design of JNJ-5207852, a diamine-based H(3) antagonist with good in vitro and in vivo efficacy but with an undesirable long half-life. However, further modifications of the template provided an understanding of the effect of structural modifications on pharmacokinetic properties, ultimately affording several additional series of compounds including JNJ-10181457, a compound with an improved pharmacokinetic profile. These compounds allowed in vivo pharmacological evaluation to show that H(3) antagonists promote wakefulness, but unlike modafinil and classical psychostimultants, they do not increase locomotor activity or produce any alteration of the EEG power spectral activity in rats. H(3) antagonists also increase extracellular acetylcholine and norepinephrine but not dopamine in rat frontal cortex and show efficacy in various models of learning-memory deficit. In addition, cFos immunoreactivity studies show H(3) antagonists activate neuronal cells in restricted rat brain regions in contrast to widespread activation after modafinil or amphetamine treatment. Therefore, H(3) antagonists are promising clinical candidates for the treatment of excessive day time sleepiness and/or cognitive disorders.
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Affiliation(s)
- P Bonaventure
- Johnson & Johnson Pharmaceutical Research & Development, L.L.C., 3210 Merryfield Row, San Diego, CA 92121, USA.
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23
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Bongers G, Bakker RA, Leurs R. Molecular aspects of the histamine H3 receptor. Biochem Pharmacol 2007; 73:1195-204. [PMID: 17276412 DOI: 10.1016/j.bcp.2007.01.008] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2006] [Revised: 11/27/2006] [Accepted: 01/03/2007] [Indexed: 11/19/2022]
Abstract
The cloning of the histamine H(3) receptor (H(3)R) cDNA in 1999 by Lovenberg et al. [10] allowed detailed studies of its molecular aspects and indicated that the H(3)R can activate several signal transduction pathways including G(i/o)-dependent inhibition of adenylyl cyclase, activation of phospholipase A(2), Akt and the mitogen activated kinase as well as the inhibition of the Na(+)/H(+) exchanger and inhibition of K(+)-induced Ca(2+) mobilization. Moreover, cloning of the H(3)R has led to the discovery several H(3)R isoforms generated through alternative splicing of the H(3)R mRNA. The H(3)R has gained the interest of many pharmaceutical companies as a potential drug target for the treatment of various important disorders like obesity, myocardial ischemia, migraine, inflammatory diseases and several CNS disorders like Alzheimer's disease, attention-deficit hyperactivity disorder and schizophrenia. In this paper, we review various molecular aspects of the hH(3)R including its signal transduction, dimerization and the occurrence of different H(3)R isoforms.
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Affiliation(s)
- Gerold Bongers
- Leiden/Amsterdam Center for Drug Research, Department of Medicinal Chemistry, Vrije Universiteit Amsterdam, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
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24
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Madeo M, Granata T, Facciolo RM, Tripepi S, Canonaco M. Feeding differences in pubertal and aged golden hamsters (Mesocricetus auratus) are related to specific cerebral expression pattern of histamine subtype 3 receptor. Behav Neurosci 2007; 120:1235-41. [PMID: 17201467 DOI: 10.1037/0735-7044.120.6.1235] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The hibernating golden hamster (Mesocricetus auratus) is becoming a useful rodent model to study the neurophysiological role of some neuromediators on vital behaviors such as sleep and thermoregulation. Recent works have shown that the histamine neuroreceptor subtypes (H-sub(1-3)R) are able to modulate such behaviors. Here, specific subtype(s) and cerebral nuclei that were actively operating on feeding behaviors in pubertal and adult hamsters were identified. Of the subtypes assessed, H-sub-3R antagonist (thioperamide) provoked significant (p < .001) changes in behavior (very low total food and water intake) in adults, whereas it did not significantly modify these behaviors in pubertals. The H-sub-3R antagonist's role seemed to be related to elevated amounts of stress-induced damaged neurons displaying, mainly, shrunken crenated cell membranes and altered synaptic processes in limbic areas such as amygdala, cortex, and hippocampus. At the transcription level, an evident expression pattern of H-sub-3R messenger RNA appeared in pubertals, especially in neurons of the cortex and hippocampus, whereas the same trend was featured in amygdalar areas of hibernating adult hamsters, suggesting early H-sub-3R regulatory activities, at least in limbic sites of this rodent model.
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Affiliation(s)
- Maria Madeo
- Comparative Neuroanatomy Laboratory, Department of Ecology, University of Calabria, Arcavacata di Rende, Italy
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25
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Yoshimoto R, Miyamoto Y, Shimamura K, Ishihara A, Takahashi K, Kotani H, Chen AS, Chen HY, MacNeil DJ, Kanatani A, Tokita S. Therapeutic potential of histamine H3 receptor agonist for the treatment of obesity and diabetes mellitus. Proc Natl Acad Sci U S A 2006; 103:13866-71. [PMID: 16954192 PMCID: PMC1560086 DOI: 10.1073/pnas.0506104103] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2005] [Indexed: 01/12/2023] Open
Abstract
Histamine H3 receptors (H3Rs) are located on the presynaptic membranes and cell soma of histamine neurons, where they negatively regulate the synthesis and release of histamine. In addition, H3Rs are also located on nonhistaminergic neurons, acting as heteroreceptors to regulate the releases of other amines such as dopamine, serotonin, and norepinephrine. The present study investigated the effects of H3R ligands on appetite and body-weight regulation by using WT and H3R-deficient mice (H3RKO), because brain histamine plays a pivotal role in energy homeostasis. The results showed that thioperamide, an H3R inverse agonist, increases, whereas imetit, an H3R agonist, decreases appetite and body weight in diet-induced obese (DiO) WT mice. Moreover, in DiO WT mice, but not in DiO H3RKO mice, imetit reduced fat mass, plasma concentrations of leptin and insulin, and hepatic triglyceride content. The anorexigenic effects of imetit were associated with a reduction in histamine release, but a comparable reduction in histamine release with alpha-fluoromethylhistidine, an inhibitor of histamine synthesis, increased appetite. Moreover, the anorexigenic effects of imetit were independent of the melanocortin system, because imetit comparably reduced appetite in melanocortin 3 and 4 receptor-deficient mice. The results provide roles of H3Rs in energy homeostasis and suggest a therapeutic potential for H3R agonists in the treatment of obesity and diabetes mellitus.
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Affiliation(s)
- Ryo Yoshimoto
- *Tsukuba Research Institute, Banyu Pharmaceutical Company, Ltd., Tsukuba, Ibaraki 300-2611, Japan; and
| | - Yasuhisa Miyamoto
- *Tsukuba Research Institute, Banyu Pharmaceutical Company, Ltd., Tsukuba, Ibaraki 300-2611, Japan; and
| | - Ken Shimamura
- *Tsukuba Research Institute, Banyu Pharmaceutical Company, Ltd., Tsukuba, Ibaraki 300-2611, Japan; and
| | - Akane Ishihara
- *Tsukuba Research Institute, Banyu Pharmaceutical Company, Ltd., Tsukuba, Ibaraki 300-2611, Japan; and
| | - Kazuhiko Takahashi
- *Tsukuba Research Institute, Banyu Pharmaceutical Company, Ltd., Tsukuba, Ibaraki 300-2611, Japan; and
| | - Hidehito Kotani
- *Tsukuba Research Institute, Banyu Pharmaceutical Company, Ltd., Tsukuba, Ibaraki 300-2611, Japan; and
| | - Airu S. Chen
- Department of Metabolic Disorders, Merck Research Laboratories, Rahway, NJ 07065
| | - Howard Y. Chen
- Department of Metabolic Disorders, Merck Research Laboratories, Rahway, NJ 07065
| | - Douglas J. MacNeil
- Department of Metabolic Disorders, Merck Research Laboratories, Rahway, NJ 07065
| | - Akio Kanatani
- *Tsukuba Research Institute, Banyu Pharmaceutical Company, Ltd., Tsukuba, Ibaraki 300-2611, Japan; and
| | - Shigeru Tokita
- *Tsukuba Research Institute, Banyu Pharmaceutical Company, Ltd., Tsukuba, Ibaraki 300-2611, Japan; and
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26
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Pan JB, Yao BB, Miller TR, Kroeger PE, Bennani YL, Komater VA, Esbenshade TA, Hancock AA, Decker MW, Fox GB. Evidence for tolerance following repeated dosing in rats with ciproxifan, but not with A-304121. Life Sci 2006; 79:1366-79. [PMID: 16730751 DOI: 10.1016/j.lfs.2006.04.002] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2005] [Revised: 01/31/2006] [Accepted: 04/04/2006] [Indexed: 11/17/2022]
Abstract
Blockade of presynaptic histamine H(3) receptors with potent and selective ligands improves cognitive function in rodents and there is significant interest in developing such drugs for long-term symptomatic treatment of CNS disorders such as attention deficit hyperactivity disorder (ADHD). Unfortunately, little is known about the effects of repeated exposure to H(3) receptor antagonists/inverse agonists. We therefore investigated the effects of acute and repeated daily administration of two potent, brain penetrating H(3) receptor antagonists/inverse agonists, ciproxifan and A-304121, on rat body weight, food and water intake, core temperature and locomotor activity, as well as H(3) receptor density and gene expression levels. Methylphenidate, used clinically for the treatment of ADHD, was included as an additional comparator. Ciproxifan, an imidazole-based compound, decreased food intake over the first 10 days and locomotor activity acutely, but these effects were lost after further repeated administration. The ex vivo binding studies revealed increased H(3) receptor density in rats following repeated administration of ciproxifan for 10 or 15 days; however, H(3) receptor gene expression was not changed. In contrast, rats treated with the non-imidazole, A-304121, did not differ from controls on any measure during the observation period, while rats treated with methylphenidate exhibited hyperthermia and hyperactivity. The implications for potential long-term treatment with H(3) receptor antagonists in CNS disorders such as ADHD are discussed.
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Affiliation(s)
- Jia Bao Pan
- Neuroscience Research, Abbott Laboratories, 100 Abbott Road, Abbott Park, IL 60064-6125, USA.
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27
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Yoshimoto R, Miyamoto Y, Takahashi K, Kotani H, Kanatani A, Tokita S. Impaired drinking response in histamine H3 receptor knockout mice following dehydration or angiotensin-II challenge. Pharmacol Biochem Behav 2006; 84:504-10. [PMID: 16887177 DOI: 10.1016/j.pbb.2006.06.014] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/06/2006] [Revised: 06/14/2006] [Accepted: 06/16/2006] [Indexed: 11/23/2022]
Abstract
Histamine H3 receptors (H3Rs) are presynaptic receptors that negatively regulate the release of histamine. The present study examined the physiological role of H3Rs in drinking behavior. In water-replete rats, intracerebroventricular (i.c.v.) administration of R-alpha-methylhistamine (RalphaMeHA), an H3R agonist, elicited drinking behavior. In contrast, i.c.v. administration of thioperamide, an H3R inverse agonist, significantly attenuated the drinking behavior elicited by either overnight dehydration or i.c.v. administration of angiotensin-II (AT-II). Inhibition of histamine release with alpha-fluoromethylhistidine, an inhibitor of histidine decarboxylase, did not elicit drinking behavior. Moreover, the inhibitory effects of thioperamide on drinking behavior in water-depleted rats were not mimicked by i.c.v. administration of histamine. These results suggest that the predominant effects of H3Rs on drinking behavior are not mediated by the modulation of histamine release. In H3R-deficient (H3RKO) mice, drinking behavior induced by overnight dehydration or i.c.v. administration of AT-II was significantly impaired compared to wild type mice. Collectively, these observations suggest that brain H3Rs play a pivotal role in drinking behavior in response to dehydration and AT-II, and these effects may be largely independent of the modulation of histaminergic tone.
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Affiliation(s)
- Ryo Yoshimoto
- Tsukuba Research Institute, BANYU Pharmaceutical Co. Ltd, Tsukuba, Ibaraki 300-2611, Japan
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28
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Łazewska D, Ligneau X, Schwartz JC, Schunack W, Stark H, Kieć-Kononowicz K. Ether derivatives of 3-piperidinopropan-1-ol as non-imidazole histamine H3 receptor antagonists. Bioorg Med Chem 2006; 14:3522-9. [PMID: 16466921 DOI: 10.1016/j.bmc.2006.01.013] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2005] [Revised: 12/29/2005] [Accepted: 01/06/2006] [Indexed: 11/16/2022]
Abstract
A series of aliphatic and aromatic ether derivatives of 3-piperidinopropan-1-ol has been prepared by four different methods. The ethers obtained were evaluated for their affinities at recombinant human histamine H3 receptor, stably expressed in CHO-K1 or HEK 293 cells. All compounds investigated show from moderate to high in vitro affinities in the nanomolar concentration range. Selected compounds were investigated under in vivo conditions after oral administration to mice. Some proved to be highly potent and orally available histamine H3 receptor antagonists. The most potent antagonists in this series have been in vitro the 4-(1,1-dimethylpropyl)phenyl ether 19 (hH3R K(i) = 8.4 nM) and in vivo the simple ethyl ether 2 (ED50 = 1.0mg/kg).
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Affiliation(s)
- Dorota Łazewska
- Jagiellonian University Medical College, Faculty of Pharmacy, Department of Technology and Biotechnology of Drugs, Medyczna 9, 30-688 Kraków, Poland
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29
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Yao BB, Witte DG, Miller TR, Carr TL, Kang CH, Cassar S, Faghih R, Bennani YL, Surber BW, Hancock AA, Esbenshade TA. Use of an inverse agonist radioligand [3H]A-317920 reveals distinct pharmacological profiles of the rat histamine H3 receptor. Neuropharmacology 2006; 50:468-78. [PMID: 16316670 DOI: 10.1016/j.neuropharm.2005.10.008] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2005] [Revised: 10/11/2005] [Accepted: 10/12/2005] [Indexed: 11/30/2022]
Abstract
Selective radioligands for histamine H(3) receptors have been used to characterize H(3) receptor pharmacology by radioligand binding assays and to determine H(3) receptor distribution by tissue autoradiography. Here we report the synthesis and receptor binding characterization of [(3)H]A-317920 (furan-2-carboxylic acid(2-[4-[3-([3,5-(3)H]4-cyclopropanecarbonyl-phenoxy)-propyl]-piperazin-1-yl]-1-methyl-2-oxo-ethyl)-amide), a high affinity inverse agonist radioligand for the rat H(3) receptor. The binding of [(3)H]A-317920 to rat cortical and cloned H(3) receptors revealed fast on- and slower off-rate kinetics with calculated K(d) values in agreement with those determined in saturation binding assays (0.2 nM for both receptors). Further, we compared [(3)H]A-317920 with the agonist [(3)H](N)-alpha-methylhistamine ([(3)H]NalphaMH) as radioligand tools to study receptor pharmacology. Agonists and antagonists displaced [(3)H]NalphaMH with one-site binding characteristics and Hill slopes approached unity. In contrast, although antagonists exhibited one-site binding, [(3)H]A-317920 displacement by agonists was best fit by two-site binding models, and the potencies of the high affinity, GDP-sensitive sites correlated with the potencies defined in [(3)H]NalphaMH binding. Unlike [(125)I]iodoproxyfan, [(3)H]A-317920 exhibits potent and selective binding to rat H(3) receptors with low binding to non-H(3) sites, including cytochrome P450. These findings show that [(3)H]A-317920 is a potent rat H(3) receptor antagonist radioligand and has utility for studying H(3) receptor pharmacology.
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Affiliation(s)
- B Bei Yao
- Neuroscience Disease Research, Global Pharmaceutical Research & Development, Abbott Laboratories, Abbott Park, IL 60064, USA.
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30
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Bakker RA, Lozada AF, van Marle A, Shenton FC, Drutel G, Karlstedt K, Hoffmann M, Lintunen M, Yamamoto Y, van Rijn RM, Chazot PL, Panula P, Leurs R. Discovery of naturally occurring splice variants of the rat histamine H3 receptor that act as dominant-negative isoforms. Mol Pharmacol 2006; 69:1194-206. [PMID: 16415177 DOI: 10.1124/mol.105.019299] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
We described previously the cDNA cloning of three functional rat histamine H3 receptor (rH3R) isoforms as well as the differential brain expression patterns of their corresponding mRNAs and signaling properties of the resulting rH3A, rH3B, and rH3C receptor isoforms (Mol Pharmacol 59:1-8). In the current report, we describe the cDNA cloning, mRNA localization in the rat central nervous system, and pharmacological characterization of three additional rH3R splice variants (rH3D, rH3E, and rH3F) that differ from the previously published isoforms in that they result from an additional alternative-splicing event. These new H3R isoforms lack the seventh transmembrane (TM) helix and contain an alternative, putatively extracellular, C terminus (6TM-rH3 isoforms). After heterologous expression in COS-7 cells, radioligand binding or functional responses upon the application of various H3R ligands could not be detected for the 6TM-rH3 isoforms. In contrast to the rH3A receptor (rH3AR), detection of the rH3D isoform using hemagglutinin antibodies revealed that the rH3D isoform remains mainly intracellular. The expression of the rH3D-F splice variants, however, modulates the cell surface expression-levels and subsequent functional responses of the 7TM H3R isoforms. Coexpression of the rH3AR and the rH3D isoforms resulted in the intracellular retention of the rH3AR and reduced rH3AR functionality. Finally, we show that in rat brain, the H3R mRNA expression levels are modulated upon treatment with the convulsant pentylenetetrazole, suggesting that the rH3R isoforms described herein thus represent a novel physiological mechanism for controlling the activity of the histaminergic system.
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Affiliation(s)
- Remko A Bakker
- The Leiden/Amsterdam Center for Drug Research, Department of Medicinal Chemistry, Vrije Universiteit Amsterdam, De Boelelaan 1083, 1081HV Amsterdam, The Netherlands
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31
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Ito S, Yoshimoto R, Miyamoto Y, Mitobe Y, Nakamura T, Ishihara A, MacNeil DJ, Kanatani A, Tokita S. Detailed pharmacological characterization of GT-2331 for the rat histamine H3 receptor. Eur J Pharmacol 2006; 529:40-6. [PMID: 16316645 DOI: 10.1016/j.ejphar.2005.10.066] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2005] [Revised: 10/21/2005] [Accepted: 10/26/2005] [Indexed: 11/23/2022]
Abstract
Histamine H(3) receptor antagonists are potential therapeutic agents for cognitive dysfunction, epilepsy, hypersomnia and obesity. GT-2331 (4-[(R,R)-2-(5,5-dimethyl-1-hexynyl)cyclopropyl]-1H-imidazole) was originally identified as a potent histamine H(3) receptor antagonist. However, recent reports demonstrated a complex pharmacology for GT-2331. To further understand the pharmacological profile of GT-2331, we characterized GT-2331 using various in vitro and in vivo assays. In vitro, GT-2331 behaved as a full agonist on adenylyl cyclase inhibition and as a partial agonist on [(35)S]GTPgammaS binding at the recombinant rat histamine H(3) receptor. In contrast, in vivo, GT-2331 had no effect on brain histamine turnover while the histamine H(3) receptor agonist R-alpha-methylhistamine significantly decreased histamine turnover. Furthermore, GT-2331 completely blocked R-alpha-methylhistamine-induced water intake, suggesting that GT-2331 behaves as a full antagonist. Thus, GT-2331 displayed the spectrum of pharmacological activities from full agonism to full antagonism, these observations suggest that histamine H(3) receptor ligands need to be carefully evaluated in various paradigms.
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Affiliation(s)
- Sayaka Ito
- Tsukuba Research Institute, Banyu Pharmaceutical Co., Ltd., Tsukuba, Ibaraki 300-2611, Japan
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Barocelli E, Ballabeni V, Manenti V, Flammini L, Bertoni S, Morini G, Comini M, Impicciatore M. Discovery of histamine H3 receptor antagonistic property of simple imidazole-free derivatives: Preliminary pharmacological investigation. Pharmacol Res 2005; 53:226-32. [PMID: 16364652 DOI: 10.1016/j.phrs.2005.11.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/19/2005] [Revised: 05/11/2005] [Accepted: 05/13/2005] [Indexed: 10/25/2022]
Abstract
The histamine H3 receptor subtype negatively modulates the release of various neurotransmitters such as histamine, glutamate, norepinephrine, acetylcholine and many others mainly in the CNS and H3 antagonists have been developed to treat central diseases characterized by neurotransmission disturbance such as schizophrenia, memory/learning and sleep disorders. In search for non-imidazole histamine H3 receptor antagonists, currently indicated as a promising class of H3 blockers, a series of simple alkylpiperidine derivatives has been studied to attain a preliminary pharmacological profile. The compounds were characterized in vitro in terms of binding affinity, antagonistic potency and selectivity at rodent H3 receptors. The imidazole-free derivatives possessed moderate to pronounced antagonistic potency at guinea-pig ileal H3 receptor consistent with binding affinity at rat brain H3 receptors and showed a favourable receptor selectivity profile. For the compound 5, with the highest affinity at rat H3 receptors, comparable values were calculated in binding (pKi = 8.35) and functional (pA2 = 8.22) assays in SK-N-MC cells stably expressing human H3 receptors. These findings indicate to extend the investigation to pharmacokinetic property and central effects to gain deeper knowledge on the pharmacological potential of this compound.
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Affiliation(s)
- Elisabetta Barocelli
- Dipartimento di Scienze Farmacologiche, Biologiche e Chimiche Applicate, Università di Parma, Parco Area delle Scienze 27/a, 43100 Parma, Italy.
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Ding W, Zou H, Dai J, Duan Z. Combining restriction digestion and touchdown PCR permits detection of trace isoforms of histamine H3 receptor. Biotechniques 2005; 39:841-5. [PMID: 16382901 DOI: 10.2144/000112021] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
The conserved sequences of the mouse histamine H3 receptor at the potential alternative splice junctions suggest that the splice isoforms found in guinea pig, rat, human, and hamster may also be present in the mouse. However, the trace amount isoforms are hard to be detected by the regular PCR approach. In this paper, we report a method in which the unspliced long isoform is cut by restriction endonuclease so that the short isoforms can be amplified to detectable levels to confirm the existence of the splice isoforms of H3 receptor mRNA in the mouse. This method is applicable to the detection of trace amounts of splice isoforms that coexist with the long, more abundant isoforms.
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Lintunen M, Sallmen T, Karlstedt K, Panula P. Transient changes in the limbic histaminergic system after systemic kainic acid-induced seizures. Neurobiol Dis 2005; 20:155-69. [PMID: 16137576 DOI: 10.1016/j.nbd.2005.02.007] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2004] [Revised: 02/17/2005] [Accepted: 02/24/2005] [Indexed: 11/19/2022] Open
Abstract
Increased brain histamine is reported to protect against convulsions. We used systemic kainic acid (KA) administration to study possible changes of the histaminergic system in rat brain in status epilepticus (SE). Robust increases in brain histamine concentrations and numbers of histamine-immunoreactive nerve fibers were detected in the piriform cortex (Pir) and amygdala after KA injection, suggesting a reactive increase, which is opposite to other published aminergic transmitter responses. These changes, lasting several weeks, might be coupled to a mechanism unrelated to the anticonvulsive function of histamine. Transient increases in mRNA expression of H(3) receptor isoforms with a full-length third intracellular loop, coupled to mitogen-activated protein kinase pathway, were detected first in the hippocampal CA3c area, followed by the Pir and amygdala and then the hippocampal CA1 area. These results suggest that histamine and H3 receptors, which also control the release of GABA and glutamate, might be involved in convulsive SE.
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Affiliation(s)
- Minnamaija Lintunen
- Department of Biology, Abo Akademi University, Biocity, Tykistokatu 6A, FIN-20520 Turku, Finland
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Jin C, Lintunen M, Panula P. Histamine H(1) and H(3) receptors in the rat thalamus and their modulation after systemic kainic acid administration. Exp Neurol 2005; 194:43-56. [PMID: 15899242 DOI: 10.1016/j.expneurol.2005.01.012] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2004] [Revised: 01/07/2005] [Accepted: 01/19/2005] [Indexed: 12/30/2022]
Abstract
In rat thalamus, histamine H(1) receptor and isoforms of H(3) receptor were expressed predominantly in the midline and intralaminar areas. Correspondingly, higher H(1) and H(3) receptor binding was also detected in these areas. All isoforms of H(3) receptor were expressed in several thalamic nuclei, but there were minor differences between their expression patterns. H(1) mRNA expression was high in the ventral thalamus, but the H(1) binding level was low in these areas. Since increased brain histamine appears to have an antiepileptic effect through the H(1) receptor activity, kainic acid (KA)-induced status epilepticus in rat was used to study modulation of H(1) and H(3) receptors in the thalamus following seizures. After systemic KA administration, transient decreases in mRNA expression of H(1) receptor and H(3) receptor isoforms with full-length third intracellular loops were seen in the midline areas and the H(1) receptor mRNA expression also decreased in the ventral thalamus. After 1 week, a robust increase in mRNA expression of H(3) receptor isoforms with a full-length third intracellular loop was found in the ventral posterior, posterior, and geniculate nuclei. The changes indicate a modulatory role of H(3) receptor in the sensory and motor relays, and might be involved in possible neuroprotective and compensatory mechanisms after KA administration. However, short-term increases in the H(3) receptor binding appeared earlier (72 h) than the increases of H(3) mRNA expression (1-4 w). The elevations in H(3) binding were evident in the intralaminar area, laterodorsal, lateral posterior, posterior and geniculate nuclei, and were likely to be related to the cortical and subcortical inputs to thalamus.
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MESH Headings
- Animals
- Binding, Competitive/drug effects
- Binding, Competitive/physiology
- Down-Regulation/drug effects
- Down-Regulation/physiology
- Epilepsy/chemically induced
- Epilepsy/metabolism
- Epilepsy/physiopathology
- Excitatory Amino Acid Agonists/pharmacology
- Histamine/metabolism
- Kainic Acid/pharmacology
- Male
- Protein Isoforms/drug effects
- Protein Isoforms/genetics
- Protein Isoforms/metabolism
- Protein Structure, Tertiary/physiology
- RNA, Messenger/drug effects
- RNA, Messenger/metabolism
- Radioligand Assay
- Rats
- Rats, Sprague-Dawley
- Receptors, Histamine H1/drug effects
- Receptors, Histamine H1/genetics
- Receptors, Histamine H1/metabolism
- Receptors, Histamine H3/drug effects
- Receptors, Histamine H3/genetics
- Receptors, Histamine H3/metabolism
- Status Epilepticus/chemically induced
- Status Epilepticus/metabolism
- Status Epilepticus/physiopathology
- Thalamus/anatomy & histology
- Thalamus/drug effects
- Thalamus/metabolism
- Up-Regulation/drug effects
- Up-Regulation/physiology
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Affiliation(s)
- Congyu Jin
- Department of Biology, Abo Akademi University, BioCity, Tykistokatu 6A, FIN-20520 Turku, Finland
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36
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Canonaco M, Madeo M, Alò R, Giusi G, Granata T, Carelli A, Canonaco A, Facciolo RM. The Histaminergic Signaling System Exerts a Neuroprotective Role against Neurodegenerative-Induced Processes in the Hamster. J Pharmacol Exp Ther 2005; 315:188-95. [PMID: 15976014 DOI: 10.1124/jpet.105.088153] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The neurotoxic 3-nitropropionic acid (3-NP), a freckled milk vetch-derived inhibitor of mitochondrial enzymatic processes that is capable of mimicking the typical pathological features of neurodegenerative disorders, behaved in a differentiated manner in a hibernating rodent (hamster) with respect to a nonhibernating rodent (rat). Treatment of the two rodents with both an acute and chronic 3-NP dose supplied deleterious neuronal effects due to distinct histamine receptor (H(n)R) transcriptional activities, especially in the case of the rat. In hamsters, these treatment modalities accounted for overall reduced global activity in a freely moving environment and overt motor symptoms such as hindlimb dystonia and clasping with respect to the greater abnormal motor behaviors in rats. This behavioral difference appeared to be strongly related to qualitative fewer neuronal alterations and, namely, lesser crenated cell membranes, swollen mitochondria, and darkened nuclei in hamster brain areas. Moreover, a mixed H(1,3)R mRNA expression pattern was reported for both rodents treated with a chronic 3-NP dose as demonstrated by predominantly low H1R mRNA levels (>50%) in rat striatum and cortex, whereas extremely high H3R levels (>80%) characterized the lateral and central amygdala nuclei plus the striatum of hamsters. Interestingly, the H3R antagonist (thioperamide) blocked 3-NP-dependent behaviors plus induced an up-regulation of H1R levels in mainly the above-reported hamster amygdalar nuclei. Overall, these results show, for the first time, that a major protective role against neurodegenerative events appears to be strongly related to the expression activity of H(1,3)R subtypes of amygdalar neurons in this hibernating model.
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Affiliation(s)
- Marcello Canonaco
- Comparative Neuroanatomy Laboratory, Ecology Department, University of Calabria, Ponte P. Bucci, 87030 Arcavacata di Rende, Cosenza, Italy.
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37
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Song J, Doucette C, Hanniford D, Hunady K, Wang N, Sherf B, Harrington JJ, Brunden KR, Stricker-Krongrad A. Generation of Cell Lines for Drug Discovery Through Random Activation of Gene Expression: Application to the Human Histamine H3 Receptor. Assay Drug Dev Technol 2005; 3:309-18. [PMID: 15971992 DOI: 10.1089/adt.2005.3.309] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Target-based high-throughput screening (HTS) plays an integral role in drug discovery. The implementation of HTS assays generally requires high expression levels of the target protein, and this is typically accomplished using recombinant cDNA methodologies. However, the isolated gene sequences to many drug targets have intellectual property claims that restrict the ability to implement drug discovery programs. The present study describes the pharmacological characterization of the human histamine H3 receptor that was expressed using random activation of gene expression (RAGE), a technology that over-expresses proteins by up-regulating endogenous genes rather than introducing cDNA expression vectors into the cell. Saturation binding analysis using [125I]iodoproxyfan and RAGE-H3 membranes revealed a single class of binding sites with a K(D) value of 0.77 nM and a B(max) equal to 756 fmol/mg of protein. Competition binding studies showed that the rank order of potency for H3 agonists was N(alpha)-methylhistamine approximately (R)-alpha- methylhistamine > histamine and that the rank order of potency for H3 antagonists was clobenpropit > iodophenpropit > thioperamide. The same rank order of potency for H3 agonists and antagonists was observed in the functional assays as in the binding assays. The Fluorometic Imaging Plate Reader assays in RAGE-H3 cells gave high Z' values for agonist and antagonist screening, respectively. These results reveal that the human H3 receptor expressed with the RAGE technology is pharmacologically comparable to that expressed through recombinant methods. Moreover, the level of expression of the H3 receptor in the RAGE-H3 cells is suitable for HTS and secondary assays.
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Affiliation(s)
- J Song
- Athersys, Inc., Cleveland, OH 44115, USA
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38
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Ross AW, Bell LM, Littlewood PA, Mercer JG, Barrett P, Morgan PJ. Temporal changes in gene expression in the arcuate nucleus precede seasonal responses in adiposity and reproduction. Endocrinology 2005; 146:1940-7. [PMID: 15637286 DOI: 10.1210/en.2004-1538] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
In anticipation of seasonal climate changes, Siberian hamsters display a strategy for survival that entails profound physiological adaptations driven by photoperiod. These include weight loss, reproductive quiescence, and pelage growth with shortening photoperiod and vice versa with lengthening photoperiod. This study reports gene expression changes in the hypothalamus of Siberian hamsters switched from short days (SD) to long days (LD), and also in photorefractory hamsters. Siberian hamsters were maintained in either LD or SD for 14 wk, conditions that generate physiological states of obesity under LD and leanness under SD. After 14 wk, SD lighting was switched to LD and gene expression investigated after 0, 2, 4, and 6 wk by in situ hybridization. Genes encoding nuclear receptors (RXR/RAR), retinoid binding proteins (CRBP1 and CRABP2), and histamine H3 receptor were photoperiodically regulated with significantly lower expression in SD, whereas VGF mRNA expression was significantly higher in SD, in the dorsomedial posterior arcuate nucleus. After a SD-to-LD switch, gene expression changes of CRABP2, RAR, H3R, and VGF occurred relatively rapidly toward LD control levels, ahead of body weight recovery and testicular recrudescence, whereas CRBP1 responded less robustly and rxrgamma did not respond at the mRNA level. In this brain nucleus in photorefractory animals, the CRABP2, RAR, H3R, and VGF mRNA returned toward LD levels, whereas CRBP1 and rxrgamma remained at the reduced SD level. Thus, genes described here are related to photoperiodic programming of the neuroendocrine hypothalamus through expression responses within a subdivision of the arcuate nucleus.
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Affiliation(s)
- Alexander W Ross
- Rowett Research Institute, Greenburn Road, Bucksburn, Aberdeen AB21 9SB, Scotland, United Kingdom
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39
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Barrett P, Ross AW, Balik A, Littlewood PA, Mercer JG, Moar KM, Sallmen T, Kaslin J, Panula P, Schuhler S, Ebling FJ, Ubeaud C, Morgan PJ. Photoperiodic regulation of histamine H3 receptor and VGF messenger ribonucleic acid in the arcuate nucleus of the Siberian hamster. Endocrinology 2005; 146:1930-9. [PMID: 15618354 DOI: 10.1210/en.2004-1452] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
To survive winter the Siberian hamster has evolved profound physiological and behavioral adaptations, including a moult to winter pelage, regression of the reproductive axis, onset of daily torpor and increased capacity for thermogenesis. However, one of the most striking adaptations is the catabolism of intraabdominal and sc fat reserves contributing to the loss of up to 40% of body weight. These physiological and behavioral adaptations are photoperiodically driven, yet neither the site(s) in the brain nor the molecular mechanism(s) involved in the regulation of these profound adaptations is known. Here we report a dynamic regulation of gene expression in a dorsal region of the medial posterior area of the arcuate nucleus (dmpARC) of the Siberian and Syrian hamster brain in response to altered photoperiod. We show mRNA for the histamine H3 receptor is down-regulated and VGF is up-regulated in the dmpARC in hamsters switched from long- to short-day photoperiod. These data provide further evidence to support the view that the dmpARC is a major site to relay photoperiodic changes and as a site for the long-term regulation of seasonal physiology and behavior.
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Affiliation(s)
- Perry Barrett
- Molecular Endocrinology Group, Rowett Research Institute, Greenburn Road, Bucksburn, Aberdeen AB21 9SB, Scotland, United Kingdom.
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40
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Affiliation(s)
- F C Shenton
- School of Biological and Biomedical Sciences, University of Durham, South Road, DH1 3LE, Durham, UK
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41
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Abstract
Since the cloning of the histamine H(3) receptor cDNA in 1999 by Lovenberg and co-workers, this histamine receptor has gained the interest of many pharmaceutical companies as a potential drug target for the treatment of various important disorders, including obesity, attention-deficit hyperactivity disorder, Alzheimer's disease, schizophrenia, as well as for myocardial ischaemia, migraine and inflammatory diseases. Here, we discuss relevant information on this target protein and describe the development of various H(3) receptor agonists and antagonists, and their effects in preclinical animal models.
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Affiliation(s)
- Rob Leurs
- Division of Medicinal Chemistry, Leiden/Amsterdam Center for Drug Research, Vrije Universiteit Amsterdam, Faculty of Science, de Boelelaan 1083, 1081 HV Amsterdam, The Netherlands.
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Jin CY, Panula P. The laminar histamine receptor system in human prefrontal cortex suggests multiple levels of histaminergic regulation. Neuroscience 2005; 132:137-49. [PMID: 15780473 DOI: 10.1016/j.neuroscience.2004.12.017] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/21/2004] [Indexed: 11/18/2022]
Abstract
Human prefrontal cortex is essential for high brain functions and its activity is modulated by multiple neurotransmitters, including histamine. However, the histamine receptors in this brain area have not been systematically studied so far. In situ hybridization and receptor binding autoradiography were employed to map and quantify the mRNA expression and receptor binding of three of the four histamine receptors (H(1), H(2), H(3)). mRNA expression and receptor binding of these three histamine receptors displayed characteristic laminar distribution patterns. Both H(1) and H(3) receptor mRNAs were mainly expressed in the deeper layers (H(1) in laminae V and VI; H(3) in lamina V), where most of the corticothalamic projections originate, whereas H(2) receptor mRNA was primarily expressed in the superficial layer II. Receptor ligand binding of these three histamine receptors displayed relatively even distribution patterns throughout the gray matter. However, higher densities of H(1) and H(3) receptor radioligand binding sites were seen in the middle layers III and IV that receive abundant thalamic inputs and where some of the apical dendrites of the deep-layer pyramidal neurons terminate, whereas higher density of H(2) receptor radioligand binding sites was seen in the superficial layers I-III. The results, together with data on histaminergic regulation of thalamic oscillations suggest that histamine regulates both cortico-cortical and thalamo-cortical circuits. As histamine receptors are also abundant in thalamus, histamine may be involved also in human diseases of the thalamocortical system.
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MESH Headings
- Adult
- Aged
- Binding, Competitive/physiology
- Dendrites/metabolism
- Female
- Histamine/metabolism
- Humans
- In Situ Hybridization
- Ligands
- Male
- Middle Aged
- Neural Pathways/metabolism
- Neurons/metabolism
- Prefrontal Cortex/anatomy & histology
- Prefrontal Cortex/metabolism
- Pyramidal Cells/metabolism
- RNA, Messenger/metabolism
- Radioligand Assay
- Receptors, Histamine/genetics
- Receptors, Histamine/metabolism
- Receptors, Histamine H1/genetics
- Receptors, Histamine H1/metabolism
- Receptors, Histamine H2/genetics
- Receptors, Histamine H2/metabolism
- Receptors, Histamine H3/genetics
- Receptors, Histamine H3/metabolism
- Synaptic Transmission/physiology
- Thalamus/metabolism
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Affiliation(s)
- C Y Jin
- Department of Biology, Abo Akademi University, BioCity, Tykistokatu 6A, FIN-20520 Turku, Finland
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43
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Passani MB, Lin JS, Hancock A, Crochet S, Blandina P. The histamine H3 receptor as a novel therapeutic target for cognitive and sleep disorders. Trends Pharmacol Sci 2004; 25:618-25. [PMID: 15530639 DOI: 10.1016/j.tips.2004.10.003] [Citation(s) in RCA: 182] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Histamine H3 receptor pharmacology, functions and biochemistry are far from being fully understood; however, progress is being made. Activation of this Gi/GO-protein-coupled receptor affects cognition, the sleep-wake cycle, obesity and epilepsy, which are physiological and pathological conditions that are the main focus of research into the therapeutic potential of selective H3 receptor ligands. This heterogeneity of targets can be reconciled partially by the fact that the histamine system constitutes one of the most important brain-activating systems and that H3 receptors regulate the activity of histamine and other neurotransmitter systems. Furthermore, the H3 receptor shows functional constitutive activity, polymorphisms in humans and rodents with a differential distribution of splice variants in the CNS, and potential coupling to different intracellular signal transduction mechanisms. In light of the genetic, pharmacological and functional complexity of the H3 receptor, the importance of the histamine system as a therapeutic target to control the sleep-wake cycle and cognitive disorders will be discussed.
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Affiliation(s)
- Maria Beatrice Passani
- Dipartimento di Farmacologia Preclinica e Clinica, Universitá di Firenze, Viale Pieraccini 6, 50139 Firenze, Italy
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Miyamoto Y, Yoshimoto R, Yumoto M, Ishihara A, Takahashi K, Kotani H, Kanatani A, Tokita S. Simultaneous fluorometric measurement of histamine and tele-methylhistamine levels in rodent brain by high-performance liquid chromatography. Anal Biochem 2004; 334:89-96. [PMID: 15464956 DOI: 10.1016/j.ab.2004.07.016] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2004] [Indexed: 11/21/2022]
Abstract
An improved high-performance liquid chromatography (HPLC) method was developed for simultaneous analysis of histamine (HA) and tele-methylhistamine (tele-MHA) levels in mouse and rat brain. The method consists of a solid-phase extraction (SPE) and subsequent HPLC with postcolumn derivatization of the amines with o-phthalaldehyde. The recovery rates of HA and tele-MHA during the SPE procedure were 82.8+/-3.4 and 86.0+/-1.7%, respectively. The detection limits for HA and tele-MHA were 8 and 12pg, respectively, with sufficient linearity up to 30pg. Using this newly developed system, we observed that the brain tele-MHA levels in H3 receptor knockout mice were significantly higher than those of wild-type mice by 2.1-fold. Furthermore, we also observed that the brain HA and tele-MHA levels in Zucker rats were significantly lower than those of lean rats by 76.6+/-5.3 and 77.8+/-5.0%, respectively. These observations coincided well with those of previous studies using radioimmunoassay or HPLC with precolumn OPA derivatization, confirming the utilization of the assay system.
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Affiliation(s)
- Yasuhisa Miyamoto
- BANYU Tsukuba Research Institute, BANYU Pharmaceutical Co., Ltd., Tsukuba, Ibaraki 300-2611, Japan
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Barbier AJ, Berridge C, Dugovic C, Laposky AD, Wilson SJ, Boggs J, Aluisio L, Lord B, Mazur C, Pudiak CM, Langlois X, Xiao W, Apodaca R, Carruthers NI, Lovenberg TW. Acute wake-promoting actions of JNJ-5207852, a novel, diamine-based H3 antagonist. Br J Pharmacol 2004; 143:649-61. [PMID: 15466448 PMCID: PMC1575430 DOI: 10.1038/sj.bjp.0705964] [Citation(s) in RCA: 127] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
1 1-[4-(3-piperidin-1-yl-propoxy)-benzyl]-piperidine (JNJ-5207852) is a novel, non-imidazole histamine H3 receptor antagonist, with high affinity at the rat (pKi=8.9) and human (pKi=9.24) H3 receptor. JNJ-5207852 is selective for the H3 receptor, with negligible binding to other receptors, transporters and ion channels at 1 microm. 2 JNJ-5207852 readily penetrates the brain tissue after subcutaneous (s.c.) administration, as determined by ex vivo autoradiography (ED50 of 0.13 mg kg(-1) in mice). In vitro autoradiography with 3H-JNJ-5207852 in mouse brain slices shows a binding pattern identical to that of 3H-R-alpha-methylhistamine, with high specific binding in the cortex, striatum and hypothalamus. No specific binding of 3H-JNJ-5207852 was observed in brains of H3 receptor knockout mice. 3 In mice and rats, JNJ-5207852 (1-10 mg kg(-1) s.c.) increases time spent awake and decreases REM sleep and slow-wave sleep, but fails to have an effect on wakefulness or sleep in H3 receptor knockout mice. No rebound hypersomnolence, as measured by slow-wave delta power, is observed. The wake-promoting effects of this H3 receptor antagonist are not associated with hypermotility. 4 A 4-week daily treatment of mice with JNJ-5207852 (10 mg kg(-1) i.p.) did not lead to a change in body weight, possibly due to the compound being a neutral antagonist at the H3 receptor. 5 JNJ-5207852 is extensively absorbed after oral administration and reaches high brain levels. 6 The data indicate that JNJ-5207852 is a novel, potent and selective H3 antagonist with good in vitro and in vivo efficacy, and confirm the wake-promoting effects of H3 receptor antagonists.
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Affiliation(s)
- A J Barbier
- Johnson & Johnson Pharmaceutical Research and Development, LLC, 3210 Merryfield Row, San Diego, CA 92121, U.S.A
| | - C Berridge
- Department of Psychology, University of Wisconsin, WI, U.S.A
| | - C Dugovic
- Department of Neurobiology and Physiology, Northwestern University, Evanston, IL, U.S.A
| | - A D Laposky
- Department of Neurobiology and Physiology, Northwestern University, Evanston, IL, U.S.A
| | - S J Wilson
- Johnson & Johnson Pharmaceutical Research and Development, LLC, 3210 Merryfield Row, San Diego, CA 92121, U.S.A
| | - J Boggs
- Johnson & Johnson Pharmaceutical Research and Development, LLC, 3210 Merryfield Row, San Diego, CA 92121, U.S.A
| | - L Aluisio
- Johnson & Johnson Pharmaceutical Research and Development, LLC, 3210 Merryfield Row, San Diego, CA 92121, U.S.A
| | - B Lord
- Johnson & Johnson Pharmaceutical Research and Development, LLC, 3210 Merryfield Row, San Diego, CA 92121, U.S.A
| | - C Mazur
- Johnson & Johnson Pharmaceutical Research and Development, LLC, 3210 Merryfield Row, San Diego, CA 92121, U.S.A
| | - C M Pudiak
- Johnson & Johnson Pharmaceutical Research and Development, LLC, 3210 Merryfield Row, San Diego, CA 92121, U.S.A
| | - X Langlois
- Johnson & Johnson Pharmaceutical Research and Development, LLC, Beerse, Belgium
| | - W Xiao
- Johnson & Johnson Pharmaceutical Research and Development, LLC, 3210 Merryfield Row, San Diego, CA 92121, U.S.A
| | - R Apodaca
- Johnson & Johnson Pharmaceutical Research and Development, LLC, 3210 Merryfield Row, San Diego, CA 92121, U.S.A
| | - N I Carruthers
- Johnson & Johnson Pharmaceutical Research and Development, LLC, 3210 Merryfield Row, San Diego, CA 92121, U.S.A
| | - T W Lovenberg
- Johnson & Johnson Pharmaceutical Research and Development, LLC, 3210 Merryfield Row, San Diego, CA 92121, U.S.A
- Author for correspondence:
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46
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Esbenshade TA, Fox GB, Krueger KM, Baranowski JL, Miller TR, Kang CH, Denny LI, Witte DG, Yao BB, Pan JB, Faghih R, Bennani YL, Williams M, Hancock AA. Pharmacological and behavioral properties of A-349821, a selective and potent human histamine H3 receptor antagonist. Biochem Pharmacol 2004; 68:933-45. [PMID: 15294456 DOI: 10.1016/j.bcp.2004.05.048] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2004] [Accepted: 05/25/2004] [Indexed: 11/28/2022]
Abstract
Histamine H3 receptors regulate the release of a variety of central neurotransmitters involved in cognitive processes. A-349821 ((4'-(3-((R,R)2,5-dimethyl-pyrrolidin-1-yl)-propoxy)-biphenyl-4-yl)-morpholin-4-yl-methanone) is a novel, non-imidazole H3 receptor ligand, displaying high affinity for recombinant rat and human H3 receptors, with pKi values of 9.4 and 8.8, respectively, and high selectivity for the H3 receptor versus H1, H2, and H4 histamine receptors. A-349821 is a potent H3 receptor antagonist in a variety of models using recombinant human and rat receptors, reversing agonist induced changes in cyclic AMP formation (pKb= 8.2 and pKb= 8.1, respectively), [35S]-GTPgammaS binding (pKb= 9.3 and pKb= 8.6, respectively) and calcium levels (human pKb= 8.3). In native systems, A-349821 competitively reversed agonist induced inhibition of electric field stimulated guinea-pig ileum (pA2= 9.5) and histamine-mediated inhibition of [3H]-histamine release from rat brain cortical synaptosomes (pKb= 9.2). Additionally, A-349821 inhibited constitutive GTPgammaS binding at both rat and human H3 receptors with respective pEC50 values of 9.1 and 8.6, demonstrating potent inverse agonist properties. In behavioral studies, A-349821 (0.4 mg/kg-4 mg/kg) potently blocked (R)-alpha-methylhistamine-induced dipsogenia in mice. The compound also enhanced cognitive activity in a five-trial inhibitory avoidance model in spontaneously hypertensive rat (SHR) pups at doses of 1-10mg/kg, with the 1mg/kg dose showing comparable efficacy to a fully efficacious dose of ciproxifan (3mg/kg). These doses of A-349821 were without effect on spontaneous locomotor activity. Thus, A-349821 is a novel, selective non-imidazole H3 antagonist/inverse agonist with balanced high potency across species and favorable cognition enhancing effects in rats.
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Affiliation(s)
- Timothy A Esbenshade
- Abbott Laboratories, Global Pharmaceutical Research Division, Department of Neuroscience Research, Abbott Park, IL 60064, USA.
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Abstract
The existence of mouse H3-receptor isoforms was investigated by PCR analysis and cDNA cloning. Splicing mechanisms previously reported in various species are conserved in the mouse. The retention/deletion of a fragment in the third intracellular loop of the mouse receptor leads to the existence of three isoforms designated mH(3(445)), mH(3(413)) and mH(3(397)) according to the length of their deduced amino acid sequence. PCR analysis showed that mouse H3-receptor isoforms display different expression patterns in the brain. Following expression in Cos-1 cells, [125I]iodoproxyfan binding indicated similar pharmacological profiles of the mH(3(445)), mH(3(413)) and mH(3(397)) isoforms. The pharmacological profile of the mouse H3 receptor is more similar to the rat receptor than to the human receptor, although some differences were also observed between the mouse and rat receptors. For example, the potency of thioperamide and ciproxifan is slightly higher at the mouse receptor than at the rat receptor but 40-100-fold higher than at the human receptor. In situ hybridization histochemistry showed that the distribution of H3-receptor mRNAs in the mouse brain is rather similar to that previously reported in the rat brain. However, the autoradiographic and cellular expression patterns observed in several brain areas such as the thalamus or hippocampus reveal important differences between the two species.
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Affiliation(s)
- Agnès Rouleau
- Unité de Neurobiologie et Pharmacologie Moléculaire (U573) de l'INSERM, Centre Paul Broca, Paris, France
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48
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Lippert U, Artuc M, Grützkau A, Babina M, Guhl S, Haase I, Blaschke V, Zachmann K, Knosalla M, Middel P, Krüger-Krasagakis S, Henz BM. Human skin mast cells express H2 and H4, but not H3 receptors. J Invest Dermatol 2004; 123:116-23. [PMID: 15191551 DOI: 10.1111/j.0022-202x.2004.22721.x] [Citation(s) in RCA: 104] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Mast cells generate and release histamine during anaphylactic reactions, and there is pharmacological evidence that histamine regulates this process via specific receptors. Therefore, we examined human leukemic (HMC-1) and normal skin mast cells for the expression of all four currently known histamine receptors. Both cell types expressed H2 and H4 receptors at mRNA and protein levels, whereas H3 receptor specific mRNA and receptor protein was undetectable. Similarly, immunohistochemistry of cutaneous tissue showed an absence of H3 receptor in these cells. Despite transcription of mRNA, H1 receptor protein was only moderately expressed in HMC-1 cells and was virtually absent in skin mast cells. Furthermore, only H1, H2, and H4 receptors were detectable by Western blot analysis of HMC-1 cells. Radiolabeled histamine binding was strongly inhibited only by H2 (ranitidine)- and H3/H4 (FUB 108)-specific antagonists. Histamine-induced increase of cAMP was inhibited by the H2 receptor antagonist famotidine, whereas induction of IP3 was not observed, making signaling via the H1 receptor unlikely. These data show that human mast cells constitutively express primarily H2 and H4 receptors and that H2 receptors are functionally linked to cellular processes. They provide new insights into the mechanisms that govern auto- and paracrine histamine-induced mast cell functions.
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MESH Headings
- Binding, Competitive
- Blotting, Western
- Cells, Cultured
- Flow Cytometry
- Gene Expression
- Humans
- Mast Cells/cytology
- Mast Cells/physiology
- Polymerase Chain Reaction
- RNA, Messenger/analysis
- Receptors, G-Protein-Coupled
- Receptors, Histamine/genetics
- Receptors, Histamine/metabolism
- Receptors, Histamine H2/genetics
- Receptors, Histamine H2/metabolism
- Receptors, Histamine H3/genetics
- Receptors, Histamine H3/metabolism
- Receptors, Histamine H4
- Skin/cytology
- Tritium
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Affiliation(s)
- Undine Lippert
- Department of Dermatology, University Hospital, Göttingen, Germany.
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Karlstedt K, Ahman MJ, Anichtchik OV, Soinila S, Panula P. Expression of the H3 receptor in the developing CNS and brown fat suggests novel roles for histamine. Mol Cell Neurosci 2004; 24:614-22. [PMID: 14664812 DOI: 10.1016/s1044-7431(03)00208-2] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
Abstract
Histamine and histamine receptors have been implicated in signaling mechanisms in developmental processes in the brain and peripheral organs. Pharmacological studies have also implied that the histamine H(3) receptor, in addition to acting as a presynaptic auto- and heteroreceptor in the central nervous system, is active in peripheral tissues. We show that detectable histamine H(3)-receptor expression during development and in adult rat is restricted to specific areas of the brain and to adipocytes and the capillary network in brown adipose tissue. Histamine H(3)-receptor mRNA expression was not detected in other internal organs studied, or in spinal or sympathetic chain ganglia. These results support a histaminergic involvement in brain development through activation of the histamine H(3) receptor and indicate a possible novel involvement of the histamine H(3) receptor as a mediator of the effects of histamine in thermogenesis in brown adipose tissue.
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Affiliation(s)
- Kaj Karlstedt
- Department of Biology, Abo Akademi University, Biocity, Artillerigatan 6A, FIN-20520 Turku, Finland.
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50
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Abstract
Several lines of evidence indicate that the histaminergic (HA) system is important for wakefulness and behavioral state regulation. We investigated the hypothesis that age-related changes in HA system occur which may be related to decreased alertness in aging. Although histidine decarboxylase mRNA levels did not change with age in C57BL/6 mice, significant differences were found in histamine H1 receptor (H1R), histamine H2 receptor (H2R), and histamine H3 receptor (H3R) mRNA levels in several brain regions. The most widespread changes were observed in H1R mRNA, which were significantly lower (27-38%) in the cortex, hypothalamus, hippocampus and medulla of 24-month-old mice relative to 3-month-old animals. Age-related changes in H2R mRNA levels were restricted to the pons and cerebellum and decreased H3R mRNA was found only in the medulla. In conjunction with the age-related decrease in hypocretin receptor 2 mRNA levels we have previously reported, decreased HA receptor mRNA levels may contribute to diminished alertness, sleep continuity, and diurnal rhythms of sleep and wakefulness in the aged.
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Affiliation(s)
- Akira Terao
- Molecular Neurobiology Laboratory, SRI International, 333 Ravenswood Avenue, Menlo Park, CA 94025, USA
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