151
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Orexin/hypocretin and histamine: distinct roles in the control of wakefulness demonstrated using knock-out mouse models. J Neurosci 2009; 29:14423-38. [PMID: 19923277 DOI: 10.1523/jneurosci.2604-09.2009] [Citation(s) in RCA: 180] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
To determine the respective role played by orexin/hypocretin and histamine (HA) neurons in maintaining wakefulness (W), we characterized the behavioral and sleep-wake phenotypes of orexin (Ox) knock-out (-/-) mice and compared them with those of histidine-decarboxylase (HDC, HA-synthesizing enzyme)-/- mice. While both mouse strains displayed sleep fragmentation and increased paradoxical sleep (PS), they presented a number of marked differences: (1) the PS increase in HDC(-/-) mice was seen during lightness, whereas that in Ox(-/-) mice occurred during darkness; (2) contrary to HDC(-/-), Ox(-/-) mice had no W deficiency around lights-off, nor an abnormal EEG and responded to a new environment with increased W; (3) only Ox(-/-), but not HDC(-/-) mice, displayed narcolepsy and deficient W when faced with motor challenge. Thus, when placed on a wheel, wild-type (WT), but not littermate Ox(-/-) mice, voluntarily spent their time in turning it and as a result, remained highly awake; this was accompanied by dense c-fos expression in many areas of their brains, including Ox neurons in the dorsolateral hypothalamus. The W and motor deficiency of Ox(-/-) mice was due to the absence of Ox because intraventricular dosing of orexin-A restored their W amount and motor performance whereas SB-334867 (Ox1-receptor antagonist, i.p.) impaired W and locomotion of WT mice during the test. These data indicate that Ox, but not HA, promotes W through enhanced locomotion and suggest that HA and Ox neurons exert a distinct, but complementary and synergistic control of W: the neuropeptide being more involved in its behavioral aspects, whereas the amine is mainly responsible for its qualitative cognitive aspects and cortical EEG activation.
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152
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Tiligada E, Zampeli E, Sander K, Stark H. Histamine H3and H4receptors as novel drug targets. Expert Opin Investig Drugs 2009; 18:1519-31. [DOI: 10.1517/14728220903188438] [Citation(s) in RCA: 113] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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153
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Rodríguez Sarmiento RM, Nettekoven MH, Taylor S, Plancher JM, Richter H, Roche O. Selective naphthalene H3 receptor inverse agonists with reduced potential to induce phospholipidosis and their quinoline analogs. Bioorg Med Chem Lett 2009; 19:4495-500. [DOI: 10.1016/j.bmcl.2009.03.100] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2009] [Revised: 03/18/2009] [Accepted: 03/21/2009] [Indexed: 10/21/2022]
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154
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Development of a selective and potent radioactive ligand for histamine H3 receptors: A compound potentially useful for receptor occupancy studies. Bioorg Med Chem Lett 2009; 19:4075-8. [DOI: 10.1016/j.bmcl.2009.06.025] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2009] [Revised: 06/02/2009] [Accepted: 06/03/2009] [Indexed: 11/19/2022]
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155
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Sasaki T, Takahashi T, Nagase T, Mizutani T, Ito S, Mitobe Y, Miyamoto Y, Kanesaka M, Yoshimoto R, Tanaka T, Takenaga N, Tokita S, Sato N. Synthesis, structure–activity relationships, and biological profiles of a dihydrobenzoxathiin class of histamine H3 receptor inverse agonists. Bioorg Med Chem Lett 2009; 19:4232-6. [DOI: 10.1016/j.bmcl.2009.05.101] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2009] [Revised: 05/21/2009] [Accepted: 05/25/2009] [Indexed: 11/25/2022]
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156
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Guo RX, Anaclet C, Roberts JC, Parmentier R, Zhang M, Guidon G, Buda C, Sastre JP, Feng JQ, Franco P, Brown SH, Upton N, Medhurst AD, Lin JS. Differential effects of acute and repeat dosing with the H3 antagonist GSK189254 on the sleep-wake cycle and narcoleptic episodes in Ox-/- mice. Br J Pharmacol 2009; 157:104-17. [PMID: 19413575 DOI: 10.1111/j.1476-5381.2009.00205.x] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
BACKGROUND AND PURPOSE Histamine H3 receptor antagonists are currently being evaluated in clinical trials for a number of central nervous system disorders including narcolepsy. These agents can increase wakefulness (W) in cats and rodents following acute administration, but their effects after repeat dosing have not been reported previously. EXPERIMENTAL APPROACH EEG and EMG recordings were used to investigate the effects of acute and repeat administration of the novel H3 antagonist GSK189254 on the sleep-wake cycle in wild-type (Ox+/+) and orexin knockout (Ox-/-) mice, the latter being genetically susceptible to narcoleptic episodes. In addition, we investigated H3 and H1 receptor expression in this model using radioligand binding and autoradiography. KEY RESULTS In Ox+/+ and Ox-/- mice, acute administration of GSK189254 (3 and 10 mg x kg(-1) p.o.) increased W and decreased slow wave and paradoxical sleep to a similar degree to modafinil (64 mg x kg(-1)), while it reduced narcoleptic episodes in Ox-/- mice. After twice daily dosing for 8 days, the effect of GSK189254 (10 mg x kg(-1)) on W in both Ox+/+ and Ox-/- mice was significantly reduced, while the effect on narcoleptic episodes in Ox-/- mice was significantly increased. Binding studies revealed no significant differences in H3 or H1 receptor expression between Ox+/+ and Ox-/- mice. CONCLUSIONS AND IMPLICATIONS These studies provide further evidence to support the potential use of H3 antagonists in the treatment of narcolepsy and excessive daytime sleepiness. Moreover, the differential effects observed on W and narcoleptic episodes following repeat dosing could have important implications in clinical studies.
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Affiliation(s)
- R X Guo
- INSERM/UCBL-U628, Integrated Physiology of Brain Arousal Systems, Department of Experimental Medicine, Faculty of Medicine, Claude Bernard University, Lyon Cedex, France
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157
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Pierson PD, Fettes A, Freichel C, Gatti-McArthur S, Hertel C, Huwyler J, Mohr P, Nakagawa T, Nettekoven M, Plancher JM, Raab S, Richter H, Roche O, Rodríguez Sarmiento RM, Schmitt M, Schuler F, Takahashi T, Taylor S, Ullmer C, Wiegand R. 5-Hydroxyindole-2-carboxylic Acid Amides: Novel Histamine-3 Receptor Inverse Agonists for the Treatment of Obesity. J Med Chem 2009; 52:3855-68. [DOI: 10.1021/jm900409x] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
| | - Alec Fettes
- F. Hoffmann-La Roche Ltd., Pharmaceuticals Division, CH-4070 Basel, Switzerland
| | - Christian Freichel
- F. Hoffmann-La Roche Ltd., Pharmaceuticals Division, CH-4070 Basel, Switzerland
| | | | - Cornelia Hertel
- F. Hoffmann-La Roche Ltd., Pharmaceuticals Division, CH-4070 Basel, Switzerland
| | - Jörg Huwyler
- F. Hoffmann-La Roche Ltd., Pharmaceuticals Division, CH-4070 Basel, Switzerland
| | - Peter Mohr
- F. Hoffmann-La Roche Ltd., Pharmaceuticals Division, CH-4070 Basel, Switzerland
| | - Toshito Nakagawa
- F. Hoffmann-La Roche Ltd., Pharmaceuticals Division, CH-4070 Basel, Switzerland
| | - Matthias Nettekoven
- F. Hoffmann-La Roche Ltd., Pharmaceuticals Division, CH-4070 Basel, Switzerland
| | - Jean-Marc Plancher
- F. Hoffmann-La Roche Ltd., Pharmaceuticals Division, CH-4070 Basel, Switzerland
| | - Susanne Raab
- F. Hoffmann-La Roche Ltd., Pharmaceuticals Division, CH-4070 Basel, Switzerland
| | - Hans Richter
- F. Hoffmann-La Roche Ltd., Pharmaceuticals Division, CH-4070 Basel, Switzerland
| | - Olivier Roche
- F. Hoffmann-La Roche Ltd., Pharmaceuticals Division, CH-4070 Basel, Switzerland
| | | | - Monique Schmitt
- F. Hoffmann-La Roche Ltd., Pharmaceuticals Division, CH-4070 Basel, Switzerland
| | - Franz Schuler
- F. Hoffmann-La Roche Ltd., Pharmaceuticals Division, CH-4070 Basel, Switzerland
| | - Tadakatsu Takahashi
- F. Hoffmann-La Roche Ltd., Pharmaceuticals Division, CH-4070 Basel, Switzerland
| | - Sven Taylor
- F. Hoffmann-La Roche Ltd., Pharmaceuticals Division, CH-4070 Basel, Switzerland
| | - Christoph Ullmer
- F. Hoffmann-La Roche Ltd., Pharmaceuticals Division, CH-4070 Basel, Switzerland
| | - Ruby Wiegand
- F. Hoffmann-La Roche Ltd., Pharmaceuticals Division, CH-4070 Basel, Switzerland
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158
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Gemkow MJ, Davenport AJ, Harich S, Ellenbroek BA, Cesura A, Hallett D. The histamine H3 receptor as a therapeutic drug target for CNS disorders. Drug Discov Today 2009; 14:509-15. [PMID: 19429511 DOI: 10.1016/j.drudis.2009.02.011] [Citation(s) in RCA: 143] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2008] [Revised: 02/24/2009] [Accepted: 02/25/2009] [Indexed: 11/26/2022]
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159
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Łażewska D, Kuder K, Ligneau X, Camelin JC, Schunack W, Stark H, Kieć-Kononowicz K. Diether derivatives of homo- or substituted piperidines as non-imidazole histamine H3 receptor ligands. Bioorg Med Chem 2009; 17:3037-42. [DOI: 10.1016/j.bmc.2009.03.014] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2008] [Revised: 03/04/2009] [Accepted: 03/07/2009] [Indexed: 10/21/2022]
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160
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Fluorinated non-imidazole histamine H3 receptor antagonists. Bioorg Med Chem Lett 2009; 19:2172-5. [DOI: 10.1016/j.bmcl.2009.02.110] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2009] [Revised: 02/25/2009] [Accepted: 02/26/2009] [Indexed: 11/22/2022]
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161
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Medhurst AD, Roberts JC, Lee J, Chen CPLH, Brown SH, Roman S, Lai MKP. Characterization of histamine H3 receptors in Alzheimer's Disease brain and amyloid over-expressing TASTPM mice. Br J Pharmacol 2009; 157:130-8. [PMID: 19222483 DOI: 10.1111/j.1476-5381.2008.00075.x] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
BACKGROUND AND PURPOSE Histamine H3 receptor antagonists are currently being evaluated for their potential use in a number of central nervous system disorders including Alzheimer's Disease (AD). To date, little is known about the state of H3 receptors in AD. EXPERIMENTAL APPROACH In the present study we used the radiolabelled H3 receptor antagonist [3H]GSK189254 to investigate H3 receptor binding in the amyloid over-expressing double mutant APPswe x PSI.MI46V (TASTPM) transgenic mouse model of AD and in post-mortem human AD brain samples. KEY RESULTS No significant differences in specific H3 receptor binding were observed between wild type and TASTPM mice in the cortex, hippocampus or hypothalamus. Specific [3H]GSK189254 binding was detected in sections of human medial frontal cortex from AD brains of varying disease severity (Braak stages I-VI). With more quantitative analysis in a larger cohort, we observed that H3 receptor densities were not significantly different between AD and age-matched control brains in both frontal and temporal cortical regions. However, within the AD group, [3H]GSK189254 binding density in frontal cortex was higher in individuals with more severe dementia prior to death. CONCLUSIONS AND IMPLICATIONS The maintenance of H3 receptor integrity observed in the various stages of AD in this study is important, given the potential use of H3 antagonists as a novel therapeutic approach for the symptomatic treatment of AD.
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Affiliation(s)
- A D Medhurst
- Neurosciences Centre of Excellence for Drug Discovery, GlaxoSmithKline, Third Avenue, Harlow, Essex, UK.
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162
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H3 receptor antagonists reverse delay-dependent deficits in novel object discrimination by enhancing retrieval. Psychopharmacology (Berl) 2009; 202:141-52. [PMID: 18493749 DOI: 10.1007/s00213-008-1171-2] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/13/2007] [Accepted: 04/04/2008] [Indexed: 10/22/2022]
Abstract
RATIONALE Accumulated evidence suggests a role for histamine in cognition and the use of H3 receptor antagonists in the treatment of learning and memory disorders. OBJECTIVES The aim of the current study was to investigate the cognition enhancing properties of ciproxifan, an H3 receptor antagonist, after natural forgetting in normal adult rats. MATERIALS AND METHODS The novel object discrimination task, a recognition memory test based on spontaneous exploratory behaviour, was used. Briefly, rats exposed to two identical objects during an acquisition trial can discriminate between a novel object and a familiar one during a subsequent choice trial after a short delay but not after a 24-h inter-trial interval. RESULTS The scopolamine (0.5 mg/kg, i.p.)-induced impairment after a short delay was abolished by ciproxifan (p < 0.001). Natural forgetting was prevented by a single administration of ciproxifan (3 mg/kg) prior to the retention test (p < 0.001) but not when administered before or immediately after the acquisition trial (schedule effect p < 0.05), demonstrating a specific activity on memory retrieval. Pretreatment with either pyrilamine (10 mg/kg), an H1 antagonist, or zolantidine (10 mg/kg), an H2 antagonist, prevented the retrieval enhancement effect of ciproxifan (p < 0.05 and p < 0.001, respectively). CONCLUSIONS Histamine H3 receptor antagonists restore the performance of rats impaired by scopolamine and enhance recognition memory after acute administration before the retrieval phase via a mechanism dependent on H1 and H2 receptor activation.
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163
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Preclinical investigations into the antipsychotic potential of the novel histamine H3 receptor antagonist GSK207040. Psychopharmacology (Berl) 2009; 201:483-94. [PMID: 18762914 DOI: 10.1007/s00213-008-1310-9] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/23/2008] [Accepted: 08/19/2008] [Indexed: 10/21/2022]
Abstract
OBJECTIVES To test the novel nonimidazole histamine H3 receptor antagonist 5-[(3-cyclobutyl-2,3,4,5-tetrahydro-1H-3-benzazapin-7-yl)oxy]-N-methyl-2-pyrazinecarboxamide (GSK207040) in a series of behavioral and neurochemical paradigms designed to evaluate its antipsychotic potential. MATERIALS AND METHODS Acute orally administered GSK207040 was investigated for its capacity to reverse a 24-h-induced deficit in novel object recognition memory, deficits in prepulse inhibition (PPI) induced by isolation rearing, and hyperlocomotor activity induced by amphetamine. The acute neurochemical effects of GSK207040 were explored by analyzing rat anterior cingulate cortex microdialysates for levels of dopamine, noradrenaline, and acetylcholine and by c-fos immunohistochemistry. The potential for interaction with the antipsychotic dopamine D2 receptor antagonist haloperidol was explored behaviorally (spontaneous locomotor activity and catalepsy), biochemically (plasma prolactin), and via ex vivo receptor occupancy determinations. RESULTS GSK207040 significantly enhanced object recognition memory (3 mg/kg) and attenuated isolation rearing-induced deficits in PPI (1.0 and 3.2 mg/kg) but did not reverse amphetamine-induced increases in locomotor activity. There was no evidence of an interaction of GSK207040 with haloperidol. GSK207040 (3.2 mg/kg) raised extracellular concentrations of dopamine, noradrenaline, and acetylcholine in the anterior cingulate cortex and c-fos expression in the core of the nucleus accumbens was increased at doses of 3.2 and 10.0 mg/kg. CONCLUSIONS The behavioral and neurochemical profile of GSK207040 supports the potential of histamine H3 receptor antagonism to treat the cognitive and sensory gating deficits of schizophrenia. However, the failure of GSK207040 to reverse amphetamine-induced locomotor hyperactivity suggests that the therapeutic utility of histamine H(3) receptor antagonism versus positive symptoms is less likely, at least following acute administration.
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164
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Development of novel 2-[4-(aminoalkoxy)phenyl]-4(3H)-quinazolinone derivatives as potent and selective histamine H3 receptor inverse agonists. Bioorg Med Chem Lett 2008; 18:6041-5. [DOI: 10.1016/j.bmcl.2008.10.034] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2008] [Revised: 08/25/2008] [Accepted: 10/08/2008] [Indexed: 11/20/2022]
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165
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2-Aryloxymethylmorpholine histamine H3 antagonists. Bioorg Med Chem Lett 2008; 18:5796-9. [DOI: 10.1016/j.bmcl.2008.09.077] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2008] [Revised: 09/12/2008] [Accepted: 09/15/2008] [Indexed: 11/20/2022]
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166
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Cloning and characterization of the monkey histamine H3 receptor isoforms. Eur J Pharmacol 2008; 601:8-15. [PMID: 18977214 DOI: 10.1016/j.ejphar.2008.10.026] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2008] [Revised: 09/26/2008] [Accepted: 10/13/2008] [Indexed: 11/21/2022]
Abstract
We have recently identified three splice isoforms of the histamine H(3) receptor in multiple brain regions of cynomolgus monkey (Macaca fascicularis). Two of the novel isoforms displayed a deletion in the third intracellular loop (H(3)(413) and H(3)(410)), the third isoform H(3)(335) displayed a deletion in the i3 intracellular loop and a complete deletion of the putative fifth transmembrane domain TM5. We have confirmed by RT-PCR the expression of full-length H(3)(445) mRNA as well as H(3)(413), H(3)(410), and H(3)(335) splice isoform mRNA in multiple monkey brain regions including the frontal, parietal and occipital cortex, parahippocampal gyrus, hippocampus, amygdala, caudate nucleus, putamen, thalamus, hypothalamus, and cerebellum. The full-length isoform H(3)(445) was predominant in all of the regions tested, followed by H(3)(335), with the H(3)(413) and H(3)(410) being of low abundance. When expressed in C6 cells, H(3)(445), H(3)(413), and H(3)(410) exhibit high affinity binding to the agonist ligand [(3)H]-(N)-alpha-methylhistamine with respective pK(D) values of 9.7, 9.7, and 9.6. As expected, the H(3)(335) isoform did not display any saturable binding with [(3)H]-(N)-alpha-methylhistamine. The histamine H(3) receptor agonists histamine, (R)-alpha-methylhistamine, imetit and proxyfan were able to activate calcium mobilization responses through H(3)(445), H(3)(413) and H(3)(410) receptors when they were co-expressed with the chimeric G alpha(qi5)-protein in HEK293 cells, while no response was elicited in cells expressing the H(3)(335) isoform. The existence of multiple H(3) receptor splice isoforms across species raises the possibility that isoform specific properties including ligand affinity, signal transduction coupling, and brain localization may differentially contribute to observed in vivo effects of histamine H(3) receptor antagonists.
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167
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Nagase T, Mizutani T, Sekino E, Ishikawa S, Ito S, Mitobe Y, Miyamoto Y, Yoshimoto R, Tanaka T, Ishihara A, Takenaga N, Tokita S, Sato N. Synthesis and Evaluation of Structurally Constrained Quinazolinone Derivatives as Potent and Selective Histamine H3 Receptor Inverse Agonists. J Med Chem 2008; 51:6889-901. [DOI: 10.1021/jm800569w] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tsuyoshi Nagase
- Tsukuba Research Institute, Merck Research Laboratories, Banyu Pharmaceutical Co., Ltd., Okubo 3, Tsukuba 300-2611, Japan
| | - Takashi Mizutani
- Tsukuba Research Institute, Merck Research Laboratories, Banyu Pharmaceutical Co., Ltd., Okubo 3, Tsukuba 300-2611, Japan
| | - Etsuko Sekino
- Tsukuba Research Institute, Merck Research Laboratories, Banyu Pharmaceutical Co., Ltd., Okubo 3, Tsukuba 300-2611, Japan
| | - Shiho Ishikawa
- Tsukuba Research Institute, Merck Research Laboratories, Banyu Pharmaceutical Co., Ltd., Okubo 3, Tsukuba 300-2611, Japan
| | - Sayaka Ito
- Tsukuba Research Institute, Merck Research Laboratories, Banyu Pharmaceutical Co., Ltd., Okubo 3, Tsukuba 300-2611, Japan
| | - Yuko Mitobe
- Tsukuba Research Institute, Merck Research Laboratories, Banyu Pharmaceutical Co., Ltd., Okubo 3, Tsukuba 300-2611, Japan
| | - Yasuhisa Miyamoto
- Tsukuba Research Institute, Merck Research Laboratories, Banyu Pharmaceutical Co., Ltd., Okubo 3, Tsukuba 300-2611, Japan
| | - Ryo Yoshimoto
- Tsukuba Research Institute, Merck Research Laboratories, Banyu Pharmaceutical Co., Ltd., Okubo 3, Tsukuba 300-2611, Japan
| | - Takeshi Tanaka
- Tsukuba Research Institute, Merck Research Laboratories, Banyu Pharmaceutical Co., Ltd., Okubo 3, Tsukuba 300-2611, Japan
| | - Akane Ishihara
- Tsukuba Research Institute, Merck Research Laboratories, Banyu Pharmaceutical Co., Ltd., Okubo 3, Tsukuba 300-2611, Japan
| | - Norihiro Takenaga
- Tsukuba Research Institute, Merck Research Laboratories, Banyu Pharmaceutical Co., Ltd., Okubo 3, Tsukuba 300-2611, Japan
| | - Shigeru Tokita
- Tsukuba Research Institute, Merck Research Laboratories, Banyu Pharmaceutical Co., Ltd., Okubo 3, Tsukuba 300-2611, Japan
| | - Nagaaki Sato
- Tsukuba Research Institute, Merck Research Laboratories, Banyu Pharmaceutical Co., Ltd., Okubo 3, Tsukuba 300-2611, Japan
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168
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Miller TR, Baranowski JL, Estvander BR, Witte DG, Carr TL, Manelli AM, Krueger KM, Cowart MD, Brioni JD, Esbenshade TA. A robust and high-capacity [(35)S]GTPgammaS binding assay for determining antagonist and inverse agonist pharmacological parameters of histamine H(3) receptor ligands. Assay Drug Dev Technol 2008; 6:339-49. [PMID: 18593375 DOI: 10.1089/adt.2007.118] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
Abstract
Guanosine 5'-O-(3-[(35)S]thio)triphosphate ([(35)S]GTPgammaS) binding assays were established and utilized as a reliable and high-capacity functional assay for determining antagonist and inverse agonist pharmacological parameters of novel histamine H(3) ligands, at the recombinant human H(3) receptor. [(35)S]GTPgammaS binding assays were performed with membranes prepared from human embryonic kidney 293 cells stably expressing the full-length (445 amino acids) human H(3) receptor isoform, at approximately 1 pmol/mg of protein. Utilizing robotic liquid handling, assay filtration, and scintillation counting in a 96-well format, concentration-response curves were determined for up to 40 compounds per assay. The imidazole-containing H(3) receptor antagonist ciproxifan and the non-imidazole antagonist ABT-239 inhibited (R)-alpha-methylhistamine (RAMH)-stimulated [(35)S]GTPgammaS binding in a competitive manner, and negative logarithm of the dissociation equilibrium constant (pK(b)) values determined for nearly 200 structurally diverse H(3) antagonists were very similar to the respective negative logarithm of the equilibrium inhibition constant values from N-alpha-[(3)H]methylhistamine competition binding assays. H(3) antagonists also concentration-dependently decreased basal [(35)S]GTPgammaS binding, thereby displaying inverse agonism at the constitutively active H(3) receptor. At maximally effective concentrations, non-imidazole H(3) antagonists inhibited basal [(35)S]GTPgammaS binding by approximately 20%. For over 100 of these antagonists, negative logarithm of the 50% effective concentration values for inverse agonism were very similar to the respective pK(b) values. Both H(3) receptor agonist-dependent and -independent (constitutive) [(35)S]GTPgammaS binding were sensitive to changes in assay concentrations of sodium, magnesium, and the guanine nucleotide GDP; however, the potency of ABT-239 for inhibition of RAMH-stimulated [(35)S]GTPgammaS binding was not significantly affected. These robust and reliable [(35)S]GTPgammaS binding assays have become one of the important tools in our pharmacological analysis and development of novel histamine H(3) receptor antagonists/inverse agonists.
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Affiliation(s)
- Thomas R Miller
- Neuroscience Research, Global Pharmaceutical Research and Development, Abbott Laboratories, Abbott Park, IL 60064-6125, USA.
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169
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Synthesis and evaluation of a spiro-isobenzofuranone class of histamine H3 receptor inverse agonists. Bioorg Med Chem Lett 2008; 18:5101-6. [DOI: 10.1016/j.bmcl.2008.07.125] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2008] [Revised: 07/28/2008] [Accepted: 07/30/2008] [Indexed: 11/23/2022]
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170
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Łażewska D, Kuder K, Ligneau X, Schwartz JC, Schunack W, Stark H, Kieć-Kononowicz K. Piperidine variations in search for non-imidazole histamine H3 receptor ligands. Bioorg Med Chem 2008; 16:8729-36. [DOI: 10.1016/j.bmc.2008.07.071] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2008] [Revised: 07/20/2008] [Accepted: 07/24/2008] [Indexed: 11/17/2022]
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171
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Nagase T, Mizutani T, Ishikawa S, Sekino E, Sasaki T, Fujimura T, Ito S, Mitobe Y, Miyamoto Y, Yoshimoto R, Tanaka T, Ishihara A, Takenaga N, Tokita S, Fukami T, Sato N. Synthesis, Structure−Activity Relationships, and Biological Profiles of a Quinazolinone Class of Histamine H3 Receptor Inverse Agonists. J Med Chem 2008; 51:4780-9. [DOI: 10.1021/jm8003834] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Tsuyoshi Nagase
- Tsukuba Research Institute, Merck Research Laboratories, Banyu Pharmaceutical Co., Ltd, Okubo 3, Tsukuba, Ibaraki 300-2611, Japan
| | - Takashi Mizutani
- Tsukuba Research Institute, Merck Research Laboratories, Banyu Pharmaceutical Co., Ltd, Okubo 3, Tsukuba, Ibaraki 300-2611, Japan
| | - Shiho Ishikawa
- Tsukuba Research Institute, Merck Research Laboratories, Banyu Pharmaceutical Co., Ltd, Okubo 3, Tsukuba, Ibaraki 300-2611, Japan
| | - Etsuko Sekino
- Tsukuba Research Institute, Merck Research Laboratories, Banyu Pharmaceutical Co., Ltd, Okubo 3, Tsukuba, Ibaraki 300-2611, Japan
| | - Takahide Sasaki
- Tsukuba Research Institute, Merck Research Laboratories, Banyu Pharmaceutical Co., Ltd, Okubo 3, Tsukuba, Ibaraki 300-2611, Japan
| | - Takashi Fujimura
- Tsukuba Research Institute, Merck Research Laboratories, Banyu Pharmaceutical Co., Ltd, Okubo 3, Tsukuba, Ibaraki 300-2611, Japan
| | - Sayaka Ito
- Tsukuba Research Institute, Merck Research Laboratories, Banyu Pharmaceutical Co., Ltd, Okubo 3, Tsukuba, Ibaraki 300-2611, Japan
| | - Yuko Mitobe
- Tsukuba Research Institute, Merck Research Laboratories, Banyu Pharmaceutical Co., Ltd, Okubo 3, Tsukuba, Ibaraki 300-2611, Japan
| | - Yasuhisa Miyamoto
- Tsukuba Research Institute, Merck Research Laboratories, Banyu Pharmaceutical Co., Ltd, Okubo 3, Tsukuba, Ibaraki 300-2611, Japan
| | - Ryo Yoshimoto
- Tsukuba Research Institute, Merck Research Laboratories, Banyu Pharmaceutical Co., Ltd, Okubo 3, Tsukuba, Ibaraki 300-2611, Japan
| | - Takeshi Tanaka
- Tsukuba Research Institute, Merck Research Laboratories, Banyu Pharmaceutical Co., Ltd, Okubo 3, Tsukuba, Ibaraki 300-2611, Japan
| | - Akane Ishihara
- Tsukuba Research Institute, Merck Research Laboratories, Banyu Pharmaceutical Co., Ltd, Okubo 3, Tsukuba, Ibaraki 300-2611, Japan
| | - Norihiro Takenaga
- Tsukuba Research Institute, Merck Research Laboratories, Banyu Pharmaceutical Co., Ltd, Okubo 3, Tsukuba, Ibaraki 300-2611, Japan
| | - Shigeru Tokita
- Tsukuba Research Institute, Merck Research Laboratories, Banyu Pharmaceutical Co., Ltd, Okubo 3, Tsukuba, Ibaraki 300-2611, Japan
| | - Takehiro Fukami
- Tsukuba Research Institute, Merck Research Laboratories, Banyu Pharmaceutical Co., Ltd, Okubo 3, Tsukuba, Ibaraki 300-2611, Japan
| | - Nagaaki Sato
- Tsukuba Research Institute, Merck Research Laboratories, Banyu Pharmaceutical Co., Ltd, Okubo 3, Tsukuba, Ibaraki 300-2611, Japan
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Bertoni S, Ballabeni V, Flammini L, Saccani F, Domenichini G, Morini G, Comini M, Rivara M, Barocelli E. In vitro and in vivo pharmacological analysis of imidazole-free histamine H3 receptor antagonists: promising results for a brain-penetrating H3 blocker with weak anticholinesterase activity. Naunyn Schmiedebergs Arch Pharmacol 2008; 378:335-43. [DOI: 10.1007/s00210-008-0299-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2008] [Accepted: 04/08/2008] [Indexed: 10/22/2022]
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173
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Davenas E, Rouleau A, Morisset S, Arrang JM. Autoregulation of McA-RH7777 hepatoma cell proliferation by histamine H3 receptors. J Pharmacol Exp Ther 2008; 326:406-13. [PMID: 18474684 DOI: 10.1124/jpet.107.135368] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Previous studies have suggested that histamine (HA) acts as an autocrine growth factor. We have explored the modulation of cell proliferation by HA using McA-RH7777 hepatoma cells. High L-histidine decarboxylase (HDC) expression and HA synthesis were found in McA-RH7777 cells. Whereas extracellular HA reached submicromolar concentrations, intracellular levels were very low, indicating that HA was secreted by the cells. McA-RH7777 cells also express H3-receptor (H3R) transcripts and proteins. Reverse transcriptase-polymerase chain reaction analysis detected only transcripts for the long isoform. Immunocytochemistry performed with a selective H3R antibody showed that most cells were immunoreactive. H3R binding sites (Bmax approximately 30 fmol/mg protein) were identified when [125I] iodoproxyfan binding was displaced by the agonist imetit. High-affinity binding also occurred at cytochrome P450 enzymes. This binding was not inhibited by HA, H3R agonists, or by a nonimidazole H3R antagonist but was displaced by imidazole H3R antagonists or by ketoconazole, a imidazole-containing cytochrome inhibitor. HA inhibited proliferation of McA-RH7777 hepatoma cells. The absence of uptake system, its much higher potency at H3Rs, and its low intracellular levels suggested that HA interacted with H3Rs rather than cytochromes. In agreement, both imidazole H3R antagonists, a nonimidazole H3R antagonist, and the HDC inhibitor alpha-monofluoromethyl histidine increased cell proliferation (up to approximately 60%), revealing a H3R-mediated inhibition by endogenous HA. Moreover, exogenous HA inhibited the increase induced by alpha-FMH or H3R antagonists with a nanomolar potency. In conclusion, our findings show that HA regulates proliferation of McA-RH7777 hepatoma cells by interacting with autoinhibitory H3Rs.
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Affiliation(s)
- E Davenas
- Laboratoire de Neurobiologie et Pharmacologie Moléculaire, Centre de Psychiatrie et Neurosciences de l'INSERM, 2 ter rue d'Alésia, 75014 Paris, France
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174
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The histamine H3 receptor: an attractive target for the treatment of cognitive disorders. Br J Pharmacol 2008; 154:1166-81. [PMID: 18469850 DOI: 10.1038/bjp.2008.147] [Citation(s) in RCA: 224] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
The histamine H3 receptor, first described in 1983 as a histamine autoreceptor and later shown to also function as a heteroreceptor that regulates the release of other neurotransmitters, has been the focus of research by numerous laboratories as it represents an attractive drug target for a number of indications including cognition. The purpose of this review is to acquaint the reader with the current understanding of H3 receptor localization and function as a modulator of neurotransmitter release and its effects on cognitive processes, as well as to provide an update on selected H3 antagonists in various states of preclinical and clinical advancement. Blockade of centrally localized H3 receptors by selective H3 receptor antagonists has been shown to enhance the release of neurotransmitters such as histamine, ACh, dopamine and norepinephrine, among others, which play important roles in cognitive processes. The cognitive-enhancing effects of H3 antagonists across multiple cognitive domains in a wide number of preclinical cognition models also bolster confidence in this therapeutic approach for the treatment of attention deficit hyperactivity disorder, Alzheimer's disease and schizophrenia. However, although a number of clinical studies examining the efficacy of H3 receptor antagonists for a variety of cognitive disorders are currently underway, no clinical proof of concept for an H3 receptor antagonist has been reported to date. The discovery of effective H3 antagonists as therapeutic agents for the novel treatment of cognitive disorders will only be accomplished through continued research efforts that further our insights into the functions of the H3 receptor.
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175
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Lin JS, Dauvilliers Y, Arnulf I, Bastuji H, Anaclet C, Parmentier R, Kocher L, Yanagisawa M, Lehert P, Ligneau X, Perrin D, Robert P, Roux M, Lecomte JM, Schwartz JC. An inverse agonist of the histamine H3 receptor improves wakefulness in narcolepsy: Studies in orexin−/− mice and patients. Neurobiol Dis 2008; 30:74-83. [PMID: 18295497 DOI: 10.1016/j.nbd.2007.12.003] [Citation(s) in RCA: 224] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2007] [Revised: 12/11/2007] [Accepted: 12/14/2007] [Indexed: 11/30/2022] Open
Affiliation(s)
- Jian-Sheng Lin
- INSERM-U628, 69373-Lyon, France; Faculté de Médecine, Université Claude Bernard, 69373-Lyon, France.
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176
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Le S, Gruner JA, Mathiasen JR, Marino MJ, Schaffhauser H. Correlation between ex Vivo Receptor Occupancy and Wake-Promoting Activity of Selective H3 Receptor Antagonists. J Pharmacol Exp Ther 2008; 325:902-9. [DOI: 10.1124/jpet.107.135343] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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177
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Sander K, Kottke T, Stark H. Histamine H3 Receptor Antagonists Go to Clinics. Biol Pharm Bull 2008; 31:2163-81. [DOI: 10.1248/bpb.31.2163] [Citation(s) in RCA: 162] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Kerstin Sander
- Johann Wolfgang Goethe-Universität Frankfurt am Main, Institut für Pharmazeutische Chemie
| | - Tim Kottke
- Johann Wolfgang Goethe-Universität Frankfurt am Main, Institut für Pharmazeutische Chemie
| | - Holger Stark
- Johann Wolfgang Goethe-Universität Frankfurt am Main, Institut für Pharmazeutische Chemie
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178
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Isensee K, Petroianu G, Stark H. Pharmacological aspects of cognitive impairment: past, present and future of drugs in dementia. J Appl Biomed 2007. [DOI: 10.32725/jab.2007.008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
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179
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Wijtmans M, Leurs R, de Esch I. Histamine H3 receptor ligands break ground in a remarkable plethora of therapeutic areas. Expert Opin Investig Drugs 2007; 16:967-85. [PMID: 17594183 DOI: 10.1517/13543784.16.7.967] [Citation(s) in RCA: 92] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The neurotransmitter histamine exerts its action through four distinct histamine receptors. The histamine H(1) and H(2) receptor are well established drug targets, whereas the histamine H(4) receptor is undergoing rigorous characterisation at present. The histamine H(3) receptor (H(3)R) is a G(i/o)-protein coupled receptor and is mostly expressed in the CNS. A remarkably large and different array of therapeutic areas, in which ligands for the H(3)R may prove useful, has been identified and a massive research undertaking is underway to substantiate the high expectations for H(3)R ligands. At present, several ligands for the H(3)R are being evaluated in clinical studies. In this review, the many potential therapeutic areas for H(3)R antagonists, inverse agonists and agonists is discussed. Promising medicinal chemistry and toxicological developments, as well as the advancement of several H(3)R ligands into the clinic, will be highlighted. This review also describes the problems that have been overcome and the questions that remain in developing H(3)R-related drugs. Considering the tremendous efforts by industry, it can be expected that the first H(3)R drugs will reach the market soon.
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Affiliation(s)
- Maikel Wijtmans
- Vrije Universiteit Amsterdam, Leiden/Amsterdam Center of Drug Research, Division of Medicinal Chemistry, Faculty of Sciences, De Boelelaan 1083, Amsterdam, The Netherlands
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180
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Arrang JM. Le récepteur H3 de l’histamine : une cible pour de nouveaux traitements des troubles de l’éveil et de la cognition. ANNALES PHARMACEUTIQUES FRANÇAISES 2007; 65:275-84. [PMID: 17652997 DOI: 10.1016/s0003-4509(07)90047-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
The histamine H3 receptor was identified in the 80's by our group as a presynaptic autoreceptor inhibiting histamine synthesis and release in the rat brain. Sixteen years later, cloning of the related human H3 receptor revealed the existence of isoforms, species pharmacological differences and a high constitutive (spontaneous) activity of the receptor. All these molecular findings have to be taken into account for optimizing aimed at clinical applications ligands. H3 receptor inverse agonists, by increasing histamine neuron activity, promote arousal and enhance cognitive performances. Pharmaceutical firms have shown considerable interest for this new class of drugs and many programmes of clinical development of H3 receptor inverse agonists for the treatment of arousal and cognitive disorders are presently being conducted.
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Affiliation(s)
- J-M Arrang
- Inserm, Unité de neurobiologie et pharmacologie moléculaire (U 573), Centre Paul Broca, 2 ter, rue d'Alésia F 75014 Paris.
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181
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Berlin M, Boyce CW. Recent advances in the development of histamine H3antagonists. Expert Opin Ther Pat 2007; 17:675-87. [DOI: 10.1517/13543776.17.6.675] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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182
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Arrang JM, Morisset S, Gbahou F. Constitutive activity of the histamine H3 receptor. Trends Pharmacol Sci 2007; 28:350-7. [PMID: 17573125 DOI: 10.1016/j.tips.2007.05.002] [Citation(s) in RCA: 106] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2006] [Revised: 04/12/2007] [Accepted: 05/25/2007] [Indexed: 11/27/2022]
Abstract
Constitutive activity has been mainly recorded for numerous overexpressed and/or mutated receptors. The histamine H(3) receptor (H(3)R) is a target of choice to study the physiological relevance of this process. In rodent brain, postsynaptic H(3)Rs show high constitutive activity, and presynaptic H(3) autoreceptors that show constitutive activity have a predominant role in inhibiting the activity of histamine neurons. H(3)R inverse agonists abrogate this constitutive brake and enhance histamine release in vivo. Some of these inverse agonists have entered clinical trials for the treatment of cognitive and food intake disorders. Studies performed in vitro and in vivo with proxyfan show that this H(3)R ligand is a 'protean agonist' - that is, a ligand with a spectrum of activity ranging from full agonism to full inverse agonism depending on the level of H(3)R constitutive activity. Consistent with its physiological and therapeutic relevance, the constitutive activity of H(3)R thus has a major function in the brain and regulates the activity of H(3)R-targeted drugs.
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Affiliation(s)
- Jean-Michel Arrang
- INSERM, Unité de Neurobiologie et Pharmacologie Moléculaire (U 573), Centre Paul Broca, 75014 Paris, France.
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183
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Amon M, Ligneau X, Camelin JC, Berrebi-Bertrand I, Schwartz JC, Stark H. Highly Potent Fluorescence-Tagged Nonimidazole Histamine H3 Receptor Ligands. ChemMedChem 2007; 2:708-16. [PMID: 17361979 DOI: 10.1002/cmdc.200600270] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Different (3-phenoxypropyl)piperidine derivatives have been coupled to fluorescent moieties (5-dimethylaminonaphthalene-1-sulfonyl, carbazol-9-ylcarbonyl, 2-cyanoisoindol-1-yl, 2-cyanobenzo[f]isoindol-1-yl, 2,4-dinitrobenzen-1-yl, 2,4-diaminophenyl, 7-nitrobenzofurazan-4-yl, 7-aminosulfonylbenzofurazan-4-yl, 4-methylcoumarin-6-yl) as novel histamine H(3) receptor ligands. They have been synthesised starting from piperidine in a few steps. The compounds display good to excellent histamine hH(3) receptor affinities with K(i) values ranging from 13.4 to 0.048 nM. Some of the new compounds belong to the most potent ligands known so far and may act as tools for identification and understanding of the binding site on the histamine H(3) receptor. In vivo screening on selected derivatives of Sanger's reagent showed antagonist potencies with ED(50) values from 7.9 to 0.39 mg kg(-1), p.o.
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Affiliation(s)
- Michael Amon
- Institut für Pharmazeutische Chemie, Johann Wolfgang Goethe-Universität, ZAFES/CMP, Biozentrum, Max-von-Laue-Str. 9, 60438 Frankfurt, Germany
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184
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Parmentier R, Anaclet C, Guhennec C, Brousseau E, Bricout D, Giboulot T, Bozyczko-Coyne D, Spiegel K, Ohtsu H, Williams M, Lin JS. The brain H3-receptor as a novel therapeutic target for vigilance and sleep–wake disorders. Biochem Pharmacol 2007; 73:1157-71. [PMID: 17288995 DOI: 10.1016/j.bcp.2007.01.002] [Citation(s) in RCA: 146] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2006] [Revised: 11/28/2006] [Accepted: 01/03/2007] [Indexed: 11/26/2022]
Abstract
Brain histaminergic neurons play a prominent role in arousal and maintenance of wakefulness (W). H(3)-receptors control the activity of histaminergic neurons through presynaptic autoinhibition. The role of H(3)-receptor antagonists/inverse agonists (H(3)R-antagonists) in the potential therapy of vigilance deficiency and sleep-wake disorders were studied by assessing their effects on the mouse cortical EEG and sleep-wake cycle in comparison to modafinil and classical psychostimulants. The H(3)R-antagonists, thioperamide and ciproxifan increased W and cortical EEG fast rhythms and, like modafinil, but unlike amphetamine and caffeine, their waking effects were not accompanied by sleep rebound. Conversely, imetit (H(3)R-agonist) enhanced slow wave sleep and dose-dependently attenuated ciproxifan-induced W, indicating that the effects of both ligands involve H(3)-receptor mechanisms. Additional studies using knockout (KO) mice confirmed the essential role of H(3)-receptors and histamine-mediated transmission in the wake properties of H(3)R-antagonists. Thus ciproxifan produced no increase in W in either histidine-decarboxylase (HDC, histamine-synthesizing enzyme) or H(1)- or H(3)-receptor KO-mice whereas its waking effects persisted in H(2)-receptor KO-mice. These data validate the hypothesis that H(3)R-antagonists, through disinhibition of H(3)-autoreceptors, enhancing synaptic histamine that in turn activates postsynaptic H(1)-receptors promoting W. Interestingly amphetamine and modafinil, despite their potent arousal effects, appear unlikely to depend on histaminergic mechanism as their effects still occurred in HDC KO-mice. The present study thus distinguishes two classes of wake-improving agents: the first acting through non-histaminergic mechanisms and the second acting via histamine and supports brain H(3)-receptors as potentially novel therapeutic targets for vigilance and sleep-wake disorders.
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Affiliation(s)
- R Parmentier
- INSERM-U628, Department of Experimental Medicine, Faculty of Medicine, Claude Bernard University, 69373 Lyon, France
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185
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Ligneau X, Landais L, Perrin D, Piriou J, Uguen M, Denis E, Robert P, Parmentier R, Anaclet C, Lin JS, Burban A, Arrang JM, Schwartz JC. Brain histamine and schizophrenia: potential therapeutic applications of H3-receptor inverse agonists studied with BF2.649. Biochem Pharmacol 2007; 73:1215-24. [PMID: 17343831 DOI: 10.1016/j.bcp.2007.01.023] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2006] [Revised: 01/12/2007] [Accepted: 01/17/2007] [Indexed: 10/23/2022]
Abstract
BF2.649, a high affinity and selective non-imidazole histamine H(3)-receptor antagonist/inverse agonist, was found to easily enter the brain after oral administration to mice: it displayed a ratio of brain/plasma levels of about 25 when considering either C(max) or AUC values. At low oral doses (2.5-20mg/kg), it elicited in mice a dose-dependent wakening effect accompanied with a shift towards high frequency waves of the EEG, a sign of cortical activation. DOPAC/dopamine ratios were enhanced in the prefrontal cortex but not in the striatum, indicating a selective activation of a sub-population of dopaminergic neurons. BF2.649 showed significant inhibitory activity in several mouse models of schizophrenia. It reduced locomotor hyperactivity elicited by methamphetamine or dizolcipine without significantly affecting spontaneous locomotor activity when administered alone. It also abolished the apomorphine-induced deficit in prepulse inhibition. These observations suggest that H(3)-receptor inverse agonists/antagonists deserve attention as a novel class of antipsychotic drugs endowed with pro-cognitive properties.
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186
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Humbert-Claude M, Morisset S, Gbahou F, Arrang JM. Histamine H3 and dopamine D2 receptor-mediated [35S]GTPgamma[S] binding in rat striatum: evidence for additive effects but lack of interactions. Biochem Pharmacol 2007; 73:1172-81. [PMID: 17306767 DOI: 10.1016/j.bcp.2007.01.006] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2006] [Revised: 12/19/2006] [Accepted: 01/03/2007] [Indexed: 11/28/2022]
Abstract
The interactions in the rat striatum between H(3) receptors (H(3)Rs) and D(2) receptors (D(2)Rs) were investigated with the [(35)S]GTPgamma[S] binding assay. The H(3)R agonist (R)alpha-methylhistamine increased [(35)S]GTPgamma[S] binding to striatal membranes with an EC(50)=14+/-5 nM and a maximal effect of +19+/-1%. This effect was inhibited by the H(3)R antagonist ciproxifan with a K(i)=1.0+/-0.3 nM. The D(2)R agonist quinpirole increased [(35)S]GTPgamma[S] binding to the same membranes with an EC(50)=1.5+/-0.5 microM and a maximal effect of +28+/-2%. Its effect was blocked by haloperidol with a K(i)=0.3+/-0.1 nM. The maximal effects of the H(3)R and D(2)R agonists were additive (+46+/-3%). However, D(2)R ligands did not modify the effects of H(3)R ligands and vice versa. Ciproxifan behaved as an H(3)R inverse agonist and decreased [(35)S]GTPgamma[S] binding. Haloperidol had no effect and did not change the inverse agonist effect of ciproxifan. Administrations for 10 days of ciproxifan (1.5mg/kg/day) or haloperidol (0.5mg/kg/day) did not change the effects of quinpirole and (R)alpha-methylhistamine, respectively. These data suggest that striatal H(3)Rs and D(2)Rs do not interact through their coupling to G-proteins. However, a hyperactivity of histaminergic and dopaminergic neurons being observed in schizophrenia, the additive activations of H(3)Rs and D(2)Rs suggest that they cooperate to generate some schizophrenic symptoms. Such a postsynaptic mechanism may underlie the antipsychotic-like effects of H(3)R inverse agonists and supports their therapeutic interest, alone or as adjunctive treatment with neuroleptics.
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Affiliation(s)
- Marie Humbert-Claude
- INSERM, Unité de Neurobiologie et Pharmacologie Moléculaire (U573), Centre Paul Broca, 75014 Paris, France
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187
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Chapter 4 Recent Advances in Drug Discovery of Histamine H3 Antagonists. ANNUAL REPORTS IN MEDICINAL CHEMISTRY VOLUME 42 2007. [DOI: 10.1016/s0065-7743(07)42004-8] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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