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Tsubouchi T, Kunimatsu T, Tsujimoto S, Kiyoshi A, Katsura Y, Oku S, Chihara K, Mine Y, Yamada T, Shimizu I, Bando K. The in vitro pharmacology and non-clinical cardiovascular safety studies of a novel 5-HT 4 receptor agonist, DSP-6952. Eur J Pharmacol 2018; 826:96-105. [PMID: 29501863 DOI: 10.1016/j.ejphar.2018.02.037] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2017] [Revised: 02/08/2018] [Accepted: 02/26/2018] [Indexed: 12/18/2022]
Abstract
The pharmacological activity of DSP-6952, a novel compound was investigated, compared to that of clinically efficacious gastrointestinal (GI) prokinetic 5-hydroxytryptamine4 (5-HT4) receptor agonists. DSP-6952 had a strong affinity of Ki = 51.9 nM for 5-HT4(b) receptor, and produced contraction in the isolated guinea pig colon with EC50 of 271.6 nM and low intrinsic activity of 57%, similar to tegaserod and mosapride. In the development of the 5-HT4 receptor agonists, cardiovascular risk was deliberately evaluated, because some related prokinetics were reported to cause with cardiovascular adverse events, such as ventricular arrhythmias or ischemia. DSP-6952 showed minimal effects up to 100 μM in human ether-a-go-go-related gene (hERG) channels or guinea pig cardiomyocytes. In telemetered conscious monkeys, DSP-6952 did not affect blood pressure or any electrocardiogram (ECG) up to 180 mg/kg, p.o.; however, DSP-6952 transiently increased heart rate, as well as in anesthetized dogs. The positive chronotropic effects of DSP-6952 were completely antagonized by a 5-HT4 receptor antagonist, and another 5-HT4 receptor agonist, TD-5108 also increased heart rate. These effects are considered a class effect seen in clinically developing and marketed 5-HT4 receptor agonists, and have not been regarded as a critical issue in clinical use. DSP-6952 did not induce contraction in the rabbit coronary artery up to 100 μM, which differed from tegaserod or sumatriptan. These results show that DSP-6952 does not have cardiac ischemic risk via coronary vasoconstriction. In conclusion, DSP-6952 is a promising GI prokinetic compound with partial 5-HT4 receptor agonistic activity as well as a favorable cardiovascular safety profile.
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Affiliation(s)
- Tadashi Tsubouchi
- Drug Research Division, Sumitomo Dainippon Pharma Co., Ltd., 3-1-98 Kasugade-naka, Konohana-ku, Osaka 554-0022, Japan.
| | - Takeshi Kunimatsu
- Drug Research Division, Sumitomo Dainippon Pharma Co., Ltd., 3-1-98 Kasugade-naka, Konohana-ku, Osaka 554-0022, Japan
| | - Shinji Tsujimoto
- Drug Research Division, Sumitomo Dainippon Pharma Co., Ltd., 3-1-98 Kasugade-naka, Konohana-ku, Osaka 554-0022, Japan
| | - Akihiko Kiyoshi
- Drug Research Division, Sumitomo Dainippon Pharma Co., Ltd., 3-1-98 Kasugade-naka, Konohana-ku, Osaka 554-0022, Japan
| | - Yasunori Katsura
- Drug Research Division, Sumitomo Dainippon Pharma Co., Ltd., 3-1-98 Kasugade-naka, Konohana-ku, Osaka 554-0022, Japan
| | - Seiko Oku
- Drug Research Division, Sumitomo Dainippon Pharma Co., Ltd., 3-1-98 Kasugade-naka, Konohana-ku, Osaka 554-0022, Japan
| | - Kazuhiro Chihara
- Drug Research Division, Sumitomo Dainippon Pharma Co., Ltd., 3-1-98 Kasugade-naka, Konohana-ku, Osaka 554-0022, Japan
| | - Yukiko Mine
- Drug Research Division, Sumitomo Dainippon Pharma Co., Ltd., 3-1-98 Kasugade-naka, Konohana-ku, Osaka 554-0022, Japan
| | - Toru Yamada
- Drug Research Division, Sumitomo Dainippon Pharma Co., Ltd., 3-1-98 Kasugade-naka, Konohana-ku, Osaka 554-0022, Japan
| | - Isao Shimizu
- Drug Research Division, Sumitomo Dainippon Pharma Co., Ltd., 3-1-98 Kasugade-naka, Konohana-ku, Osaka 554-0022, Japan
| | - Kiyoko Bando
- Drug Research Division, Sumitomo Dainippon Pharma Co., Ltd., 3-1-98 Kasugade-naka, Konohana-ku, Osaka 554-0022, Japan
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2
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Jeong EJ, Chung SY, Hong HN, Oh SW, Sim JY. The novel, potent and highly selective 5-HT 4 receptor agonist YH12852 significantly improves both upper and lower gastrointestinal motility. Br J Pharmacol 2018; 175:485-500. [PMID: 29139561 DOI: 10.1111/bph.14096] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2017] [Revised: 10/27/2017] [Accepted: 10/31/2017] [Indexed: 12/19/2022] Open
Abstract
BACKGROUND AND PURPOSE 5-HT4 receptor agonists have been shown to be effective at treating various gastrointestinal tract disorders. However, a lack of selectivity against off-targets has been a limiting factor for their clinical use. EXPERIMENTAL APPROACH The binding affinity and selectivity of YH12852 for human 5-HT4(a) receptor in CHO-K1 cells were evaluated using radioligand binding assays, and agonistic activity was assessed using a β-lactamase reporter system. Contractile activity and propulsive motility were measured in the guinea pig isolated distal colon. Its prokinetic effect on the gastrointestinal tract was evaluated in guinea pigs, dogs and monkeys. Its tissue distribution was evaluated in rats. KEY RESULTS YH12852 exhibited high affinity and potency for human recombinant 5-HT4(a) receptor with high selectivity over other 5-HT and non-5-HT receptors, ion channels, enzymes and transporters. YH12852 induced contractions and increased propulsive motility in guinea pig isolated colon. These effects were abolished by the 5-HT4 receptor antagonist GR113808. YH12852 increased defecation more effectively than prucalopride in guinea pigs and dogs and improved gastric emptying more effectively than mosapride in guinea pigs, dogs and monkeys. YH12852 was highly distributed to the gastrointestinal tract as the target organ. CONCLUSION AND IMPLICATIONS The high in vitro potency and selectivity of YH12852 for 5-HT4 receptor translated into potent in vivo efficacy with good tolerability. YH12852 significantly improved both upper and lower bowel motility in the animal models tested and has the potential to address considerable unmet needs in patients with functional constipation, gastroparesis or both.
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Affiliation(s)
- Eun Jeong Jeong
- Yuhan R&D Institute, Yongin-si, Gyeonggi-do, Republic of Korea
| | - Soo Yong Chung
- Yuhan R&D Institute, Yongin-si, Gyeonggi-do, Republic of Korea
| | - Han Na Hong
- Yuhan R&D Institute, Yongin-si, Gyeonggi-do, Republic of Korea
| | - Se-Woong Oh
- Yuhan R&D Institute, Yongin-si, Gyeonggi-do, Republic of Korea
| | - Jae Young Sim
- Yuhan R&D Institute, Yongin-si, Gyeonggi-do, Republic of Korea
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3
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Yaakob NS, Chinkwo KA, Chetty N, Coupar IM, Irving HR. Distribution of 5-HT3, 5-HT4, and 5-HT7 Receptors Along the Human Colon. J Neurogastroenterol Motil 2015; 21:361-9. [PMID: 26130632 PMCID: PMC4496915 DOI: 10.5056/jnm14157] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/22/2014] [Revised: 03/31/2015] [Accepted: 04/05/2015] [Indexed: 12/13/2022] Open
Abstract
Background/Aims Several disorders of the gastrointestinal tract are associated with abnormal serotonin (5-HT) signaling or metabolism where the 5-HT3 and 5-HT4 receptors are clinically relevant. The aim was to examine the distribution of 5-HT3, 5-HT4, and 5-HT7 receptors in the normal human colon and how this is associated with receptor interacting chaperone 3, G protein coupled receptor kinases, and protein LIN-7 homologs to extend previous observations limited to the sigmoid colon or the upper intestine. Methods Samples from ascending, transverse, descending, and sigmoid human colon were dissected into 3 separate layers (mucosa, longitudinal, and circular muscles) and ileum samples were dissected into mucosa and muscle layers (n = 20). Complementary DNA was synthesized by reverse transcription from extracted RNA and expression was determined by quantitative or end point polymerase chain reaction. Results The 5-HT3 receptor subunits were found in all tissues throughout the colon and ileum. The A subunit was detected in all samples and the C subunit was expressed at similar levels while the B subunit was expressed at lower levels and less frequently. The 5-HT3 receptor E subunit was mainly found in the mucosa layers. All splice variants of the 5-HT4 and 5-HT7 receptors were expressed throughout the colon although the 5-HT4 receptor d, g, and i variants were expressed less often. Conclusions The major differences in 5-HT receptor distribution within the human colon are in relation to the mucosa and muscular tissue layers where the 5-HT3 receptor E subunit is predominantly found in the mucosal layer which may be of therapeutic relevance.
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Affiliation(s)
- Nor S Yaakob
- Drug Discovery Biology, Monash Institute of Pharmaceutical Sciences, Monash University (Parkville campus), Parkville Victoria, Australia.,Drug and Herbal Research Center, Faculty of Pharmacy, Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia (Current address)
| | - Kenneth A Chinkwo
- Drug Discovery Biology, Monash Institute of Pharmaceutical Sciences, Monash University (Parkville campus), Parkville Victoria, Australia.,School of Biomedical Sciences, Charles Sturt University, Wagga Wagga, New South Wales, Australia (Current address)
| | - Navinisha Chetty
- Drug Discovery Biology, Monash Institute of Pharmaceutical Sciences, Monash University (Parkville campus), Parkville Victoria, Australia
| | - Ian M Coupar
- Drug Discovery Biology, Monash Institute of Pharmaceutical Sciences, Monash University (Parkville campus), Parkville Victoria, Australia
| | - Helen R Irving
- Drug Discovery Biology, Monash Institute of Pharmaceutical Sciences, Monash University (Parkville campus), Parkville Victoria, Australia
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4
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Rochais C, Lecoutey C, Gaven F, Giannoni P, Hamidouche K, Hedou D, Dubost E, Genest D, Yahiaoui S, Freret T, Bouet V, Dauphin F, Sopkova de Oliveira Santos J, Ballandonne C, Corvaisier S, Malzert-Fréon A, Legay R, Boulouard M, Claeysen S, Dallemagne P. Novel multitarget-directed ligands (MTDLs) with acetylcholinesterase (AChE) inhibitory and serotonergic subtype 4 receptor (5-HT4R) agonist activities as potential agents against Alzheimer's disease: the design of donecopride. J Med Chem 2015; 58:3172-87. [PMID: 25793650 DOI: 10.1021/acs.jmedchem.5b00115] [Citation(s) in RCA: 85] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
In this work, we describe the synthesis and in vitro evaluation of a novel series of multitarget-directed ligands (MTDL) displaying both nanomolar dual-binding site (DBS) acetylcholinesterase inhibitory effects and partial 5-HT4R agonist activity, among which donecopride was selected for further in vivo evaluations in mice. The latter displayed procognitive and antiamnesic effects and enhanced sAPPα release, accounting for a potential symptomatic and disease-modifying therapeutic benefit in the treatment of Alzheimer's disease.
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Affiliation(s)
- Christophe Rochais
- †UNICAEN, CERMN (Centre d'Etudes et de Recherche sur le Médicament de Normandie), F-14032 Caen, France
| | - Cédric Lecoutey
- †UNICAEN, CERMN (Centre d'Etudes et de Recherche sur le Médicament de Normandie), F-14032 Caen, France
| | - Florence Gaven
- ‡CNRS, UMR-5203, Institut de Génomique Fonctionnelle, F-34000 Montpellier, France.,§Inserm, U1191, F-34000 Montpellier, France.,∥Université de Montpellier, UMR-5203, F-34000 Montpellier, France
| | - Patrizia Giannoni
- ‡CNRS, UMR-5203, Institut de Génomique Fonctionnelle, F-34000 Montpellier, France.,§Inserm, U1191, F-34000 Montpellier, France.,∥Université de Montpellier, UMR-5203, F-34000 Montpellier, France
| | - Katia Hamidouche
- ⊥UNICAEN, GMPc5 (Groupe Mémoire et Plasticité comportementale), F-14032 Caen, France
| | - Damien Hedou
- †UNICAEN, CERMN (Centre d'Etudes et de Recherche sur le Médicament de Normandie), F-14032 Caen, France
| | - Emmanuelle Dubost
- †UNICAEN, CERMN (Centre d'Etudes et de Recherche sur le Médicament de Normandie), F-14032 Caen, France
| | - David Genest
- †UNICAEN, CERMN (Centre d'Etudes et de Recherche sur le Médicament de Normandie), F-14032 Caen, France
| | - Samir Yahiaoui
- †UNICAEN, CERMN (Centre d'Etudes et de Recherche sur le Médicament de Normandie), F-14032 Caen, France
| | - Thomas Freret
- ⊥UNICAEN, GMPc5 (Groupe Mémoire et Plasticité comportementale), F-14032 Caen, France
| | - Valentine Bouet
- ⊥UNICAEN, GMPc5 (Groupe Mémoire et Plasticité comportementale), F-14032 Caen, France
| | - François Dauphin
- ⊥UNICAEN, GMPc5 (Groupe Mémoire et Plasticité comportementale), F-14032 Caen, France
| | | | - Céline Ballandonne
- †UNICAEN, CERMN (Centre d'Etudes et de Recherche sur le Médicament de Normandie), F-14032 Caen, France
| | - Sophie Corvaisier
- †UNICAEN, CERMN (Centre d'Etudes et de Recherche sur le Médicament de Normandie), F-14032 Caen, France.,⊥UNICAEN, GMPc5 (Groupe Mémoire et Plasticité comportementale), F-14032 Caen, France
| | - Aurélie Malzert-Fréon
- †UNICAEN, CERMN (Centre d'Etudes et de Recherche sur le Médicament de Normandie), F-14032 Caen, France
| | - Remi Legay
- †UNICAEN, CERMN (Centre d'Etudes et de Recherche sur le Médicament de Normandie), F-14032 Caen, France
| | - Michel Boulouard
- ⊥UNICAEN, GMPc5 (Groupe Mémoire et Plasticité comportementale), F-14032 Caen, France
| | - Sylvie Claeysen
- ‡CNRS, UMR-5203, Institut de Génomique Fonctionnelle, F-34000 Montpellier, France.,§Inserm, U1191, F-34000 Montpellier, France.,∥Université de Montpellier, UMR-5203, F-34000 Montpellier, France
| | - Patrick Dallemagne
- †UNICAEN, CERMN (Centre d'Etudes et de Recherche sur le Médicament de Normandie), F-14032 Caen, France
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5
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Coupar IM, Irving HR, Manallack DT, Tan YY, Ayad F, Iulio JD, Tochon-Danguy N, Iskander MN. Assessment of the pharmacological properties of 5-methoxyindole derivatives at 5-HT4 receptors. J Pharm Pharmacol 2012; 64:1099-106. [DOI: 10.1111/j.2042-7158.2012.01500.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Abstract
Objectives
The aim was to examine the biological activity of 5-methoxytryptamine derivatives at the 5-hydroxytryptamine (5-HT)4 receptor to explore the effect of substitution on the aliphatic amine of the 5-methoxyamine scaffold.
Methods
Three compounds were tested for affinity at the 5-HT4 receptor by radioligand binding and functional activity using guinea-pig ileum and human colon circular muscle preparations and also in the mouse whole gut transit test.
Key findings
The three compounds all had agonist properties at the 5-HT4 receptor but their efficacy differed in the different functional tests. Compound 3 had the highest affinity for the 5-HT4 receptor and was a full agonist at relaxing human colon circular muscle with efficacy closest to 5-HT. Compounds 1 and 2 were partial agonists in this assay with lower efficacies; compound 2 was a full agonist in the guinea-pig ileum assay whereas compound 3 was a partial agonist. Compounds 1 and 2 also showed activity in the mouse gut transit assay while compound 3 had no activity.
Conclusions
Of the compounds tested, compound 3 was the most promising 5-HT4 receptor agonist and the results highlight the value of using human tissue in functional tests when assessing compounds for potential activity.
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Affiliation(s)
- Ian M Coupar
- Medicinal Chemistry and Drug Action, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville Campus, Parkville, Vic., Australia
| | - Helen R Irving
- Medicinal Chemistry and Drug Action, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville Campus, Parkville, Vic., Australia
| | - David T Manallack
- Medicinal Chemistry and Drug Action, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville Campus, Parkville, Vic., Australia
| | - Yean Y Tan
- Medicinal Chemistry and Drug Action, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville Campus, Parkville, Vic., Australia
| | - Fadi Ayad
- Medicinal Chemistry and Drug Action, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville Campus, Parkville, Vic., Australia
| | - Juliana Di Iulio
- Medicinal Chemistry and Drug Action, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville Campus, Parkville, Vic., Australia
| | - Nathalie Tochon-Danguy
- Medicinal Chemistry and Drug Action, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville Campus, Parkville, Vic., Australia
| | - Magdy N Iskander
- Medicinal Chemistry and Drug Action, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville Campus, Parkville, Vic., Australia
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6
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5-HT4 receptor agonist mediated enhancement of cognitive function in vivo and amyloid precursor protein processing in vitro: A pharmacodynamic and pharmacokinetic assessment. Neuropharmacology 2011; 61:69-79. [DOI: 10.1016/j.neuropharm.2011.02.026] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2010] [Revised: 02/16/2011] [Accepted: 02/25/2011] [Indexed: 01/14/2023]
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7
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Beattie DT, Armstrong SR, Vickery RG, Tsuruda PR, Campbell CB, Richardson C, McCullough JL, Daniels O, Kersey K, Li YP, Kim KHS. The Pharmacology of TD-8954, a Potent and Selective 5-HT(4) Receptor Agonist with Gastrointestinal Prokinetic Properties. Front Pharmacol 2011; 2:25. [PMID: 21687517 PMCID: PMC3108484 DOI: 10.3389/fphar.2011.00025] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2011] [Accepted: 05/16/2011] [Indexed: 12/12/2022] Open
Abstract
This study evaluated the in vitro and in vivo pharmacological properties of TD-8954, a potent and selective 5-HT(4) receptor agonist. TD-8954 had high affinity (pK(i) = 9.4) for human recombinant 5-HT(4(c)) (h5-HT(4(c))) receptors, and selectivity (>2,000-fold) over all other 5-hydroxytryptamine (5-HT) receptors and non-5-HT receptors, ion channels, enzymes and transporters tested (n = 78). TD-8954 produced an elevation of cAMP in HEK-293 cells expressing the h5-HT(4(c)) receptor (pEC(50) = 9.3), and contracted the guinea pig colonic longitudinal muscle/myenteric plexus preparation (pEC(50) = 8.6). TD-8954 had moderate intrinsic activity in the in vitro assays. In conscious guinea pigs, subcutaneous administration of TD-8954 (0.03-3 mg/kg) increased the colonic transit of carmine red dye, reducing the time taken for its excretion. Following intraduodenal dosing to anesthetized rats, TD-8954 (0.03-10 mg/kg) evoked a dose-dependent relaxation of the esophagus. Following oral administration to conscious dogs, TD-8954 (10 and 30 μg/kg) produced an increase in contractility of the antrum, duodenum, and jejunum. In a single ascending oral dose study in healthy human subjects, TD-8954 (0.1-20 mg) increased bowel movement frequency and reduced the time to first stool. It is concluded that TD-8954 is a potent and selective 5-HT(4) receptor agonist in vitro, with robust in vivo stimulatory activity in the gastrointestinal (GI) tract of guinea pigs, rats, dogs, and humans. TD-8954 may have clinical utility in patients with disorders of reduced GI motility.
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Affiliation(s)
- David T. Beattie
- Department of Pharmacology, Theravance, Inc.South San Francisco, CA, USA
| | - Scott R. Armstrong
- Department of Pharmacology, Theravance, Inc.South San Francisco, CA, USA
| | - Ross G. Vickery
- Department of Clinical Pharmacology and Experimental Medicine, Theravance, Inc.South San Francisco, CA, USA
| | - Pamela R. Tsuruda
- Department of Molecular and Cellular Biology, Theravance, Inc.South San Francisco, CA, USA
| | | | | | | | - Oranee Daniels
- Department of Clinical Pharmacology and Experimental Medicine, Theravance, Inc.South San Francisco, CA, USA
| | - Kathryn Kersey
- Department of Clinical Pharmacology and Experimental Medicine, Theravance, Inc.South San Francisco, CA, USA
| | - Yu-Ping Li
- Department of Biometrics, Theravance, Inc.South San Francisco, CA, USA
| | - Karl H. S. Kim
- Department of Clinical Pharmacology and Experimental Medicine, Theravance, Inc.South San Francisco, CA, USA
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8
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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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9
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Smith JAM, Beattie DT, Marquess D, Shaw JP, Vickery RG, Humphrey PPA. The in vitro pharmacological profile of TD-5108, a selective 5-HT(4) receptor agonist with high intrinsic activity. Naunyn Schmiedebergs Arch Pharmacol 2008; 378:125-37. [PMID: 18415081 DOI: 10.1007/s00210-008-0282-y] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2007] [Accepted: 03/03/2008] [Indexed: 12/17/2022]
Abstract
The in vitro pharmacological profile of TD-5108, a novel, selective 5-HT(4) receptor agonist, was compared to that of clinically efficacious gastroprokinetic 5-HT(4) receptor agonists. TD-5108 produced an elevation of cyclic adenosine monophosphate in human embryonic kidney 293 cells expressing the human recombinant 5-HT(4(c)) (h5-HT(4(c))) receptor (pEC(50) = 8.3) and 5-HT(4) receptor-mediated relaxation of the rat esophagus (pEC(50) = 7.9) and contraction of the guinea pig colon (pEC(50) = 7.9). In all in vitro assays, TD-5108 was a high intrinsic activity agonist, unlike tegaserod, mosapride, and cisapride which, in the majority of test systems, had lower intrinsic activity. TD-5108 had high affinity (pK (i) = 7.7) and selectivity (> or =25-fold) for h5-HT(4(c)) receptors over other biogenic amine receptors. TD-5108 was >500-fold selective over other 5-HT receptors (including h5-HT(2B) and h5-HT(3A)) and, at 3 microM, had no effect on human ether-à-go-go-related gene K+ channels. In conclusion, TD-5108 is a selective 5-HT(4) receptor agonist in vitro. The high intrinsic activity and preferential binding of TD-5108 to 5-HT4 over other 5-HT receptors may result in an improved clinical profile for the treatment of gastrointestinal disorders of reduced motility.
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Affiliation(s)
- J A M Smith
- Theravance, Inc., 901 Gateway Boulevard, South San Francisco, CA, 94080, USA.
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10
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11
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Abstract
5-Hydroxytryptamine(4) (5-HT(4)) receptors are an interesting target for the management of patients in need of gastrointestinal (GI) promotility treatment. They have proven therapeutic potential to treat patients with GI motility disorders. Lack of selectivity for the 5-HT(4) receptor has limited the clinical success of the agonists used until now. For instance, next to their affinity for 5-HT(4) receptors, both cisapride and tegaserod have appreciable affinity for other receptors, channels or transporters [e.g. cisapride: human ether-a-go-go-related gene (hERG) is K(+) channel and tegaserod: 5-HT(1) and 5-HT(2) receptors]. Adverse cardiovascular events observed with these compounds are not 5-HT(4) receptor-related. Recent efforts have led to the discovery of a series of selective 5-HT(4) receptor ligands, with prucalopride being the most advanced in clinical development. The selectivity of these new compounds clearly differentiates them from the older generation compounds by minimizing the potential of target-unrelated side effects. The availability of selective agonists enables the focus to shift to the exploration of 5-HT(4) receptor-related differences between agonists. Based on drug- and tissue-related properties (e.g. differences in receptor binding, receptor density, effectors, coupling efficiency), 5-HT(4) receptor agonists are able to express tissue selectivity, i.e. behave as a partial agonist in some and as a full agonist in other tissues. Furthermore, the concept of ligand-directed signalling offers great opportunities for future drug development by enlarging the scientific basis for the generation of agonist-specific effects in different cell types, tissues or organs. Selective 5-HT(4) receptor agonists might thus prove to be innovative drugs with an attractive safety profile for better treatment of patients suffering from hypomotility disorders.
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