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Serotonin 5-HT4 receptors and forebrain cholinergic system: receptor expression in identified cell populations. Brain Struct Funct 2014; 220:3413-34. [DOI: 10.1007/s00429-014-0864-z] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2014] [Accepted: 07/29/2014] [Indexed: 02/06/2023]
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Lohith TG, Xu R, Tsujikawa T, Morse CL, Anderson KB, Gladding RL, Zoghbi SS, Fujita M, Innis RB, Pike VW. Evaluation in monkey of two candidate PET radioligands, [ 11 C]RX-1 and [ 18 F]RX-2, for imaging brain 5-HT 4 receptors. Synapse 2014; 68:613-623. [PMID: 25088028 DOI: 10.1002/syn.21773] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2014] [Accepted: 07/25/2014] [Indexed: 12/26/2022]
Abstract
The serotonin subtype-4 (5-HT4 ) receptor, which is known to be involved physiologically in learning and memory, and pathologically in Alzheimer's disease, anxiety, and other neuropsychiatric disorders-has few radioligands readily available for imaging in vivo. We have previously reported two novel 5-HT4 receptor radioligands, namely [methoxy-11 C](1-butylpiperidin-4-yl)methyl 4-amino-3-methoxybenzoate; [11 C]RX-1), and the [18 F]3-fluoromethoxy analog ([18 F]RX-2), and in this study we evaluated them by PET in rhesus monkey. Brain scans were performed at baseline, receptor preblock or displacement conditions using SB 207710, a 5-HT4 receptor antagonist, on the same day for [11 C]RX-1 and on different days for [18 F]RX-2. Specific-to-nondisplaceable ratio (BPND ) was measured with the simplified reference tissue model from all baseline scans. To determine specific binding, total distribution volume (VT ) was also measured in some monkeys by radiometabolite-corrected arterial input function after ex vivo inhibition of esterases from baseline and blocked scans. Both radioligands showed moderate to high peak brain uptake of radioactivity (2-6 SUV). Regional BPND values were in the rank order of known 5-HT4 receptor distribution with a trend for higher BPND values from [18 F]RX-2. One-tissue compartmental model provided good fits with well identified VT values for both radioligands. In the highest 5-HT4 receptor density region, striatum, 50-60% of total binding was specific. The VT in receptor-poor cerebellum reached stable values by about 60 min for both radioligands indicating little influence of radiometabolites on brain signal. In conclusion, both [11 C]RX-1 and [18 F]RX-2 showed positive attributes for PET imaging of brain 5-HT4 receptors, validating the radioligand design strategy. Synapse 68:613-623, 2014. © 2014 Wiley Periodicals, Inc.
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Affiliation(s)
- Talakad G Lohith
- Molecular Imaging Branch, National Institute of Mental Health, National Institutes of Health, Bethesda, Maryland, 20892
| | - Rong Xu
- Molecular Imaging Branch, National Institute of Mental Health, National Institutes of Health, Bethesda, Maryland, 20892
| | - Tetsuya Tsujikawa
- Molecular Imaging Branch, National Institute of Mental Health, National Institutes of Health, Bethesda, Maryland, 20892
| | - Cheryl L Morse
- Molecular Imaging Branch, National Institute of Mental Health, National Institutes of Health, Bethesda, Maryland, 20892
| | - Kacey B Anderson
- Molecular Imaging Branch, National Institute of Mental Health, National Institutes of Health, Bethesda, Maryland, 20892
| | - Robert L Gladding
- Molecular Imaging Branch, National Institute of Mental Health, National Institutes of Health, Bethesda, Maryland, 20892
| | - Sami S Zoghbi
- Molecular Imaging Branch, National Institute of Mental Health, National Institutes of Health, Bethesda, Maryland, 20892
| | - Masahiro Fujita
- Molecular Imaging Branch, National Institute of Mental Health, National Institutes of Health, Bethesda, Maryland, 20892
| | - Robert B Innis
- Molecular Imaging Branch, National Institute of Mental Health, National Institutes of Health, Bethesda, Maryland, 20892
| | - Victor W Pike
- Molecular Imaging Branch, National Institute of Mental Health, National Institutes of Health, Bethesda, Maryland, 20892
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Synthesis and biological evaluation of positron emission tomography radiotracers targeting serotonin 4 receptors in brain: [18F]MNI-698 and [18F]MNI-699. Bioorg Med Chem Lett 2013; 23:6243-7. [DOI: 10.1016/j.bmcl.2013.09.097] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2013] [Revised: 09/25/2013] [Accepted: 09/30/2013] [Indexed: 01/06/2023]
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Acidic biphenyl derivatives: Synthesis and biological activity of a new series of potent 5-HT4 receptor antagonists. Bioorg Med Chem 2013; 21:7134-45. [DOI: 10.1016/j.bmc.2013.09.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2013] [Revised: 08/30/2013] [Accepted: 09/01/2013] [Indexed: 11/20/2022]
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Xu R, Hong J, Morse CL, Pike VW. Synthesis, structure-affinity relationships, and radiolabeling of selective high-affinity 5-HT4 receptor ligands as prospective imaging probes for positron emission tomography. J Med Chem 2010; 53:7035-47. [PMID: 20812727 DOI: 10.1021/jm100668r] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In a search for high-affinity receptor ligands that might serve for development as radioligands for the imaging of brain 5-HT(4) receptors in vivo with positron emission tomography (PET), structural modifications were made to the high-affinity 5-HT(4) antagonist (1-butylpiperidin-4-yl)methyl 8-amino-7-iodo-2,3-dihydrobenzo[b][1,4]dioxine-5-carboxylate (1, SB 207710). These modifications were made mainly on the aryl side of the ester bond to permit possible rapid labeling of the carboxylic acid component with a positron emitter, either carbon-11 (t(1/2) = 20.4 min) or fluorine-18 (t(1/2) = 109.7 min), and included (i) replacement of the iodine atom with a small substituent such as nitrile, methyl, or fluoro, (ii) methylation of the 8-amino group, (iii) opening of the dioxan ring, and (iv) alteration of the length of the N-alkyl goup. High-affinity ligands were discovered for recombinant human 5-HT(4) receptors with amenability to labeling with a positron emitter and potential for development as imaging probes. The ring-opened radioligand, (([methoxy-(11)C]1-butylpiperidin-4-yl)methyl 4-amino-3-methoxybenzoate; [(11)C]13), showed an especially favorable array of properties for future evaluation as a PET radioligand for brain 5-HT(4) receptors.
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Affiliation(s)
- Rong Xu
- Molecular Imaging Branch, National Institute of Mental Health, National Institutes of Health, Building 10, Room B3 C346A, 10 Center Drive, Bethesda, Maryland 20892, USA
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Toche RB, Pagar BP, Zoman RR, Shinde GB, Jachak MN. Synthesis of novel benzo[h][1,6]naphthyridine derivatives from 4-aminoquinoline and cyclic β-ketoester. Tetrahedron 2010. [DOI: 10.1016/j.tet.2010.04.085] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Makimoto N, Sakurai-Yamashita Y, Furuichi A, Kawakami S, Enjoji A, Kanematsu T, Taniyam K. In vivo assessment of acceleration of motor activity associated with acetylcholine release via 5-hydroxytryptamine4 receptor in dog intestine. JAPANESE JOURNAL OF PHARMACOLOGY 2002; 90:28-35. [PMID: 12396025 DOI: 10.1254/jjp.90.28] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Effect of mosapride, a benzamide, on the motor activity associated with the release of endogenous acetylcholine (ACh) from enteric neurons was examined in the ileum of anesthetized dogs using an in vivo microdialysis method and compared with the effect of 5-hydroxytryptamine (5-HT). Intraarterial administration of 5-HT accelerated intestinal motor activity and increased the concentration of dialysate ACh, and the responses were inhibited by SB204070, a specific 5-HT4-receptor antagonist, but were apparently not affected by methiothepin, ketanserin and granisetron. Intraarterial administration of mosapride, a prokinetic benzamide, accelerated intestinal motor activity and the concentration of dialysate ACh increased. The effects of mosapride were antagonized by SB204070. Specific [125I]SB207710 binding was observed in the myenteric and submucosal plexuses and muscle layers of dog ileum by in vitro receptor autoradiography. High densities of [125I]SB207710 binding sites were detected in the myenteric and submucosal plexuses. Mosapride as well as SB204070 inhibited [125I]SB207710 binding. Thus, in the whole body of dogs, 5-HT and mosapride accelerated the intestinal motor activity due to the increases in ACh release mediated by stimulation of the 5-HT4 receptor.
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Affiliation(s)
- Noriaki Makimoto
- Department of Surgery, Nagasaki University Graduate School of Biomedical Sciences, Japan
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Harada H, Yamazaki H, Toyotomi Y, Tateishi H, Mine Y, Yoshida N, Kato S. Novel N-[1-(1-substituted 4-piperidinylmethyl)-4-piperidinyl]benzamides as potent colonic prokinetic agents. Bioorg Med Chem Lett 2002; 12:967-70. [PMID: 11959005 DOI: 10.1016/s0960-894x(02)00060-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
A series of novel N-[1-(1-substituted 4-piperidinylmethyl)-4-piperidinyl]benzamides was prepared and its compounds were evaluated for their binding to 5-HT(4) receptors and effects on gastrointestinal motility in conscious dogs. 4-Amino-N-[1-[1-(4-aminobutyl)-4-piperidinylmethyl]-4-piperidinyl]-5-chloro-2-methoxybenzamide (15) was found to have a potent binding affinity for 5-HT(4) receptors (IC(50): 6.47nM) and showed excellent colonic prokinetic activity.
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Affiliation(s)
- Hiroshi Harada
- Medicinal Chemistry Group, Chemistry Research Laboratories, Dainippon Pharmaceutical Co., Ltd., Enoki 33-94, Osaka 564-0053, Suita, Japan
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Iwanaga Y. [Physicochemical and pharmacological characteristic and clinical efficacy of an anti-irritable bowel syndrome agent, polycarbophil calcium (Polyful)]. Nihon Yakurigaku Zasshi 2002; 119:185-90. [PMID: 11915521 DOI: 10.1254/fpj.119.185] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Irritable bowel syndrome (IBS) is a functional bowel disorder characterized by abdominal pain or discomfort and abnormal defecation. Polycarbophil calcium, a water-absorbing polymer, is expected to improve stool consistency. Polycarbophil calcium decalcified under the acidic condition and then absorbed 70 times its weight of water under the neutral condition. In in situ experiments using rat jejunum and colon, polycarbophil decreased water absorption by the intestine without affecting water secretion. Polycarbophil inhibited prostaglandin E2-, 5-hydroxy-L-tryptophan- and castor oil-induced diarrhea in mice or rats. Polycarbophil calcium also inhibited sennoside-induced diarrhea in dogs. Polycarbophil increased the weight of feces in naive or low-fiber diet feeding rats. In naive dogs, polycarbophil calcium increased stool frequency, stool weight and moisture. Polycarbophil was not absorbed from the gastrointestine, not metabolized and eliminated into feces in rats and dogs. Polycarbophil calcium did not affect the absorption of coadministered drugs in dogs. In the dose-finding clinical study for IBS, polycarbophil calcium was effective both in diarrhea and constipation. In the Phase III study, polycarbophil calcium was superior to trimebutine maleate in efficacy and equal in safety. Emesis/vomiting and thirst were observed, but episodes of diarrhea or constipation by excessive action were few. Polycarbophil calcium seems promising as an anti-IBS agent.
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Affiliation(s)
- Yuji Iwanaga
- Laboratory of Pharmacology, Research Division, Hokuriku Seiyaku Co., Ltd., 37-1-1 Inokuchi, Katsuyama City, Fukui 911-8555, Japan.
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Appel-Dingemanse S, Lemarechal MO, Kumle A, Hubert M, Legangneux E. Integrated modelling of the clinical pharmacokinetics of SDZ HTF 919, a novel selective 5-HT4 receptor agonist, following oral and intravenous administration. Br J Clin Pharmacol 1999; 47:483-91. [PMID: 10336571 PMCID: PMC2014177 DOI: 10.1046/j.1365-2125.1999.00936.x] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
AIMS The purpose of the present study was to assess the pharmacokinetics of the novel selective 5-HT4 receptor agonist SDZ HTF 919 (HTF) including food effect, absolute bioavailability, interoccasion and intersubject variabilities. METHODS In the randomized, open-label, three treatment, four period crossover study, HTF was administered to 12 young healthy male subjects as a 12 mg tablet (twice under fasted and once under fed conditions) and a 3 mg intravenous (i.v.) infusion over 40 min (fasted). Pharmacokinetic parameters were obtained by noncompartmental methods. A more comprehensive pharmacokinetic characterization was achieved by integrated modelling of oral (p.o.) and i.v. data. To describe the absorption phase a Weibull function and a classical first order input function were compared. RESULTS Noncompartmental pharmacokinetic analysis revealed a rapid absorption (tmax 1.3 h, fasted), an absolute bioavailability of 11+/-3%, a biphasic disposition phase with a terminal half-life of 11+/-5 h, a clearance of 77+/-15 l h-1, and a volume of distribution at steady state of 368+/-223 l. The coefficients of interoccasion and interindividual variability in Cmax and AUC ranged between 17 and 28%. Food intake caused a delay (tmax 2.0 h) and decrease in absorption with consequently lower systemic exposure ( approximately 5% absolute bioavailability). Integrated p.o./i.v. pharmacokinetic modelling with a Weibull input function allowed accurate description of individual profiles. Modelling of the data from the p.o. dosing improved the description of the terminal phase by inclusion of the i. v. data and additionally provided quantitative characterization of the absorption phase. CONCLUSIONS The pharmacokinetics of HTF could be well described by an integrated modelling approach for both p.o. and i.v. data. The derived model will provide guidance in the design of future studies.
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Affiliation(s)
- S Appel-Dingemanse
- Department of Clinical Pharmacology, NOVARTIS Pharma AG, Basel, Switzerland
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Kato S, Fujiwara I, Yoshida N. Nitrogen-containing heteroalicycles with serotonin receptor binding affinity: development of gastroprokinetic and antiemetic agents. Med Res Rev 1999; 19:25-73. [PMID: 9918193 DOI: 10.1002/(sici)1098-1128(199901)19:1<25::aid-med3>3.0.co;2-e] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
To obtain gastroprokinetic agents with more potent and selective activity than metoclopramide and cisapride, a series of N-(4-benzyl-2-morpholinylmethyl)benzamides were designed and prepared. Their synthesis and structure-activity relationships were described. As a result, mosapride was selected as a promising candidate for potent gastroprokinetic activity with selective 5-HT4 receptor agonistic activity. As an extension to this project, the novel benzamide and the carboxamide derivatives having 1-benzyl-4-methylhexahydro-1,4-diazepine ring in the amine moiety were prepared and evaluated for 5-HT3 receptor antagonistic activity. DAT-582 was identified as an antiemetic agent in cancer chemotherapy. The asymmetric synthesis of DAT-582 and the SAR studies were briefly reviewed. In further modifications of the N-(1-benzyl-4-methylhexahydro-1,4-diazepin-6-yl)benzamides, the novel nicotinamides with 1-ethyl-4-methylhexahydro-1,4-diazepin ring were found to have potent 5-HT3 and dopamine D2 and D3 receptor antagonistic activities and to show weak central nervous system depression and extrapyramidal syndrome. After extensive SARs, AS-8112 was selected as a broad antiemetic agent.
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Affiliation(s)
- S Kato
- Discovery Research Laboratories, Dainippon Pharmaceutical Co., Ltd., Suita, Osaka, Japan.
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Bockaert J, Claeysen S, Sebben M, Dumuis A. 5-HT4 receptors: gene, transduction and effects on olfactory memory. Ann N Y Acad Sci 1998; 861:1-15. [PMID: 9928233 DOI: 10.1111/j.1749-6632.1998.tb10167.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
In this paper we discuss 1) the primary structures, pharmacology, and brain distribution of cloned 5-HT4 receptors; 2) the chromosomal localization of the h5-HT4 receptor; 3) whether benzamides are full or partial agonists because of a species or a coupling difference; 4) the intrinsic activity of 5-HT4 receptors and inverse agonism of GR125487 in COS-7 cells but not in colliculi neurons; 5) the modulation of 5-HT4 receptor binding and activity; and 6) the long-term blockade of K+ channels by 5-HT4 agonists and its effect on olfactory memory. We conclude that 1) the cloning of 5-HT4 receptors in different species using RT-PCR from different tissues reveals the presence of several splice variants for 5-HT4 receptors differing in the C-terminal part, downstream from the amino acid L358; 2) the pharmacological properties of 5-HT4 receptors are dependent on the cellular context in which they are expressed; and 3) 5-HT4 agonists can be added to the list of compounds having pro-cognitive properties.
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Affiliation(s)
- J Bockaert
- CNRS UPR 9023, Centre CNRS-INSERM de Pharmacologie-Endocrinologie (CCIPE), Montpellier, France.
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Claeysen S, Faye P, Sebben M, Taviaux S, Bockaert J, Dumuis A. 5-HT4 receptors: cloning and expression of new splice variants. Ann N Y Acad Sci 1998; 861:49-56. [PMID: 9928238 DOI: 10.1111/j.1749-6632.1998.tb10172.x] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
On the basis of differences in the potencies and intrinsic activity of 5-HT4 receptor agonists in different biological models it has been suggested that there is heterogeneity among 5-HT4 receptors. Here, we report the molecular cloning of several 5-HT4 receptor splice variants in mouse, rat, and human brain. Our data suggest that the differences in efficacy of 5-HT4 ligands on 5-HT4 receptor-mediated responses in several tissues is due to differences in coupling efficiency rather than to the presence of different 5-HT4 receptor isoforms.
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Affiliation(s)
- S Claeysen
- CNRS UPR 9023, Centre CNRS-INSERM de Pharmacologie-Endocrinologie (CCIPE), Montpellier, France
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Eglen RM. 5-Hydroxytryptamine (5-HT)4 receptors and central nervous system function: an update. PROGRESS IN DRUG RESEARCH. FORTSCHRITTE DER ARZNEIMITTELFORSCHUNG. PROGRES DES RECHERCHES PHARMACEUTIQUES 1997; 49:9-24. [PMID: 9388383 DOI: 10.1007/978-3-0348-8863-9_1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- R M Eglen
- Center for Biological Research, Neurobiology Unit, Roche Bioscience, Palo Alto, CA 94304, USA.
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Appel S, Kumle A, Meier R. Clinical pharmacodynamics of SDZ HTF 919, a new 5-HT4 receptor agonist, in a model of slow colonic transit. Clin Pharmacol Ther 1997; 62:546-55. [PMID: 9390111 DOI: 10.1016/s0009-9236(97)90050-3] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
OBJECTIVES To explore the pharmacodynamic effects of the new promotile agent SDZ HTF 919, a selective partial 5-HT4 receptor agonist, in healthy subjects. METHODS A pharmacodynamic model was applied to prolong colonic transit by dietary means. Subsequently, the effects of twice-daily multiple doses of SDZ HTF 919 (1, 5, 25, and 100 mg) were investigated in a randomized, double-blind, placebo-controlled parallel-group study with 12 subjects per dose level. The sequential design with three study periods of 7 days each included intake of a self-selected diet, a liquid formula diet with soluble fiber supplementation, and a fiber-supplemented diet together with either SDZ HTF 919 or placebo administration. Stool characteristics (frequency and consistency) and total colonic transit times (with use of radiopaque markers) were recorded in each study period. RESULTS SDZ HTF 919 was well tolerated at all dose levels. The frequency of loose stool and headache increased with higher doses. After a fiber-supplemented diet intake, the median stool frequency decreased from 8 1/2-9 to 5-7 defecations per study period. SDZ HTF 919 in doses of 25 and 100 mg twice a day increased the stool frequency (p < 0.05). Stool consistency was softened by all but the lowest SDZ HTF 919 dose. A fiber-supplemented diet prolonged total colonic transit time in all groups by 45 hours on average. Twice-a-day administration of SDZ HTF 919 for 6 days in addition to a fiber-supplemented diet significantly shortened the total colonic transit time only at the 5 mg dose. The lack of effect at lower and higher SDZ HTF 919 doses suggests a biphasic dose-response relationship for total colonic transit time. CONCLUSIONS The suitability of total colonic transit time measurements in healthy subjects as a surrogate marker should be confirmed by patient studies.
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Affiliation(s)
- S Appel
- Department of Clinical Pharmacology, Novartis Pharma Ltd., Basel, Switzerland
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Dumuis A, Ansanay H, Waeber C, Sebben M, Fagni L, Bockaert J. 5-HT4 receptors. ACTA ACUST UNITED AC 1997. [DOI: 10.1016/s0165-7208(97)80017-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/12/2023]
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