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Qiu L, Jiang H, Yu Y, Gu J, Wang J, Zhao H, Huang T, Gropler RJ, Klein RS, Perlmutter JS, Tu Z. Radiosynthesis and evaluation of a fluorine-18 radiotracer [ 18F]FS1P1 for imaging sphingosine-1-phosphate receptor 1. Org Biomol Chem 2022; 20:1041-1052. [PMID: 35029272 PMCID: PMC8970350 DOI: 10.1039/d1ob02225c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Assessment of sphingosine-1-phosphate receptor 1 (S1PR1) expression could be a unique tool to determine the neuroinflammatory status for central nervous system (CNS) disorders. Our preclinical results indicate that PET imaging with [11C]CS1P1 radiotracer can quantitatively measure S1PR1 expression changes in different animal models of inflammatory diseases. Here we developed a multiple step F-18 labeling strategy to synthesize the radiotracer [18F]FS1P1, sharing the same structure with [11C]CS1P1. We explored a wide range of reaction conditions for the nucleophilic radiofluorination starting with the key ortho-nitrobenzaldehyde precursor 10. The tertiary amine additive TMEDA proved crucial to achieve high radiochemical yield of ortho-[18F]fluorobenzaldehyde [18F]12 starting with a small amount of precursor. Based on [18F]12, a further four-step modification was applied in one-pot to generate the target radiotracer [18F]FS1P1 with 30-50% radiochemical yield, >95% chemical and radiochemical purity, and a high molar activity (37-166.5 GBq μmol-1, decay corrected to end of synthesis, EOS). Subsequently, tissue distribution of [18F]FS1P1 in rats showed a high brain uptake (ID% g-1) of 0.48 ± 0.06 at 5 min, and bone uptake of 0.27 ± 0.03, 0.11 ± 0.02 at 5, and 120 min respectively, suggesting no in vivo defluorination. MicroPET studies showed [18F]FS1P1 has high macaque brain uptake with a standard uptake value (SUV) of ∼2.3 at 120 min. Radiometabolite analysis of macaque plasma samples indicated that [18F]FS1P1 has good metabolic stability, and no major radiometabolite confounded PET measurements of S1PR1 in nonhuman primate brain. Overall, [18F]FS1P1 is a promising F-18 S1PR1 radiotracer worthy of further clinical investigation for human use.
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Affiliation(s)
- Lin Qiu
- Department of Radiology, Washington University School of Medicine, Saint Louis, Missouri 63110, USA.
| | - Hao Jiang
- Department of Radiology, Washington University School of Medicine, Saint Louis, Missouri 63110, USA.
| | - Yanbo Yu
- Department of Radiology, Washington University School of Medicine, Saint Louis, Missouri 63110, USA.
| | - Jiwei Gu
- Department of Radiology, Washington University School of Medicine, Saint Louis, Missouri 63110, USA.
| | - Jinzhi Wang
- Department of Radiology, Washington University School of Medicine, Saint Louis, Missouri 63110, USA.
| | - Haiyang Zhao
- Department of Radiology, Washington University School of Medicine, Saint Louis, Missouri 63110, USA.
| | - Tianyu Huang
- Department of Radiology, Washington University School of Medicine, Saint Louis, Missouri 63110, USA.
| | - Robert J Gropler
- Department of Radiology, Washington University School of Medicine, Saint Louis, Missouri 63110, USA.
| | - Robyn S Klein
- Department of Medicine, Washington University School of Medicine, Saint Louis, Missouri 63110, USA
- Departments of Neuroscience, Washington University School of Medicine, Saint Louis, MO 63110, USA
- Department of Pathology and Immunology, Washington University School of Medicine, Saint Louis, MO 63110, USA
| | - Joel S Perlmutter
- Departments of Neuroscience, Washington University School of Medicine, Saint Louis, MO 63110, USA
- Department of Neurology, Washington University School of Medicine, Saint Louis, MO 63110, USA
- Physical Therapy and Occupational Therapy, Washington University School of Medicine, Saint Louis, MO, 63110, USA
| | - Zhude Tu
- Department of Radiology, Washington University School of Medicine, Saint Louis, Missouri 63110, USA.
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Rahman MT, Decker AM, Laudermilk L, Maitra R, Ma W, Ben Hamida S, Darcq E, Kieffer BL, Jin C. Evaluation of Amide Bioisosteres Leading to 1,2,3-Triazole Containing Compounds as GPR88 Agonists: Design, Synthesis, and Structure-Activity Relationship Studies. J Med Chem 2021; 64:12397-12413. [PMID: 34387471 PMCID: PMC8395584 DOI: 10.1021/acs.jmedchem.1c01075] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
The orphan receptor GPR88 has been implicated in a number of striatal-associated disorders, yet its endogenous ligand has not been discovered. We have previously reported that the amine functionality in the 2-AMPP-derived GPR88 agonists can be replaced with an amide (e.g., 4) without losing activity. Later, we have found that the amide can be replaced with a bioisosteric 1,3,4-oxadiazole with improved potency. Here, we report a further study of amide bioisosteric replacement with a variety of azoles containing three heteroatoms, followed by a focused structure-activity relationship study, leading to the discovery of a series of novel 1,4-disubstituted 1H-1,2,3-triazoles as GPR88 agonists. Collectively, our medicinal chemistry efforts have resulted in a potent, efficacious, and brain-penetrant GPR88 agonist 53 (cAMP EC50 = 14 nM), which is a suitable probe to study GPR88 functions in the brain.
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Affiliation(s)
- Md Toufiqur Rahman
- Center for Drug Discovery, Research Triangle Institute, Research Triangle Park, North Carolina 27709, United States
| | - Ann M Decker
- Center for Drug Discovery, Research Triangle Institute, Research Triangle Park, North Carolina 27709, United States
| | - Lucas Laudermilk
- Center for Drug Discovery, Research Triangle Institute, Research Triangle Park, North Carolina 27709, United States
| | - Rangan Maitra
- Center for Drug Discovery, Research Triangle Institute, Research Triangle Park, North Carolina 27709, United States
| | - Weiya Ma
- Douglas Research Center, Department of Psychiatry, McGill University, Montréal, Quebec H4H 1R3, Canada
| | - Sami Ben Hamida
- Douglas Research Center, Department of Psychiatry, McGill University, Montréal, Quebec H4H 1R3, Canada
- INSERM U1114, University of Strasbourg, Strasbourg 67085, France
| | - Emmanuel Darcq
- Douglas Research Center, Department of Psychiatry, McGill University, Montréal, Quebec H4H 1R3, Canada
- INSERM U1114, University of Strasbourg, Strasbourg 67085, France
| | - Brigitte L Kieffer
- Douglas Research Center, Department of Psychiatry, McGill University, Montréal, Quebec H4H 1R3, Canada
- INSERM U1114, University of Strasbourg, Strasbourg 67085, France
| | - Chunyang Jin
- Center for Drug Discovery, Research Triangle Institute, Research Triangle Park, North Carolina 27709, United States
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Choi HE, Kim Y, Lee HJ, Cheon HG. Novel FoxO1 inhibitor, JY-2, ameliorates palmitic acid-induced lipotoxicity and gluconeogenesis in a murine model. Eur J Pharmacol 2021; 899:174011. [PMID: 33705803 DOI: 10.1016/j.ejphar.2021.174011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2020] [Revised: 02/26/2021] [Accepted: 02/28/2021] [Indexed: 11/25/2022]
Abstract
Forkhead transcription factor forkhead box O1 (FoxO1) plays an important role in glucose and lipid metabolism, contributing to the pathogenesis of metabolic disorders. This study aimed to discover a novel FoxO1 inhibitor as a potential new anti-diabetic drug candidate, and describes the biological effects of JY-2, 5-(2,4-dichlorophenyl)-3-(pyridin-2-yl)-1,2,4-oxadiazole in vitro and in vivo. JY-2 inhibited FoxO1 transcriptional activity in a concentration-dependent manner, with an IC50 value of 22 μM. The inhibitory effects of JY-2 on FoxO3a and FoxO4 appeared to be weaker than that on FoxO1. Consistent with its inhibitory effect on FoxO1, JY-2 reduced the palmitic acid (PA)-stimulated mRNA expression of glucose-6-phosphatase (G6Pase) and phosphoenolpyruvate carboxykinase (PEPCK), two key enzymes involved in gluconeogenesis in HepG2 cells. In association with the reduced expression of lipid metabolism genes, triglyceride accumulation was also reduced by JY-2, as determined by Oil Red O staining. In addition, JY-2 restored PA-impaired glucose-stimulated insulin secretion (GSIS), in conjunction with an increased mRNA expression of PDX1, MafA, and insulin in INS-1 cells. The in vivo efficacy of JY-2 was examined using C57BL/6J, db/db, and high fat-diet induced obese and diabetic (DIO) mice models, and showed that JY-2 improved glucose tolerance, in parallel with a reduced mRNA expression of gluconeogenic genes. Pharmacokinetic analysis revealed that JY-2 exhibited excellent oral bioavailability (98%), with little adverse effects. These results demonstrated that the novel FoxO1 inhibitor, JY-2, may exert beneficial anti-diabetic effects and that it warrants further investigation as a novel anti-diabetic drug candidate.
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Affiliation(s)
- Hye-Eun Choi
- Department of Pharmacology, College of Medicine, Gachon University, Incheon, 21999, South Korea
| | - YuSik Kim
- Severance Institute for Vascular and Metabolic Research Yonsei University School of Medicine, Seoul, 06230, South Korea
| | - Han-Joo Lee
- College of Pharmacy, Yonsei Institute of Pharmaceutical Sciences, Yonsei University, Incheon, 21983, South Korea
| | - Hyae Gyeong Cheon
- Department of Pharmacology, College of Medicine, Gachon University, Incheon, 21999, South Korea; Department of Health Sciences and Technology, GAIHST, Gachon University, Incheon, 21999, Republic of Korea.
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Antonijoan RM, Ferrero-Cafiero JM, Coimbra J, Puntes M, Martínez-Colomer J, Arévalo MI, Mascaró C, Molinero C, Buesa C, Maes T. First-in-Human Randomized Trial to Assess Safety, Tolerability, Pharmacokinetics and Pharmacodynamics of the KDM1A Inhibitor Vafidemstat. CNS Drugs 2021; 35:331-344. [PMID: 33755924 PMCID: PMC7985749 DOI: 10.1007/s40263-021-00797-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 02/12/2021] [Indexed: 11/27/2022]
Abstract
BACKGROUND Vafidemstat, an inhibitor of the histone lysine-specific demethylase KDM1A, corrects cognition deficits and behavior alterations in rodent models. Here, we report the results from the first-in-human trial of vafidemstat in healthy young and older adult volunteers. A total of 110 volunteers participated: 87 were treated with vafidemstat and 23 with placebo. OBJECTIVES The study aimed to determine the safety and tolerability of vafidemstat, to characterize its pharmacokinetic and pharmacodynamic profiles, to assess its central nervous system (CNS) exposure, and to acquire the necessary data to select the appropriate doses for long-term treatment of patients with CNS disease in phase II trials. METHODS This single-center, randomized, double-blind, placebo-controlled phase I trial included a single and 5-day repeated dose-escalation and open-label CNS penetration substudy. Primary outcomes were safety and tolerability; secondary outcomes included analysis of the pharmacokinetics and pharmacodynamics, including chemoprobe-based immune analysis of KDM1A target engagement (TE) in peripheral blood mononuclear cells (PBMCs) and platelet monoamine oxidase B (MAOB) inhibition. CNS and cognitive function were also evaluated. RESULTS No severe adverse events (AEs) were reported in the dose-escalation stage. AEs were reported at all dose levels; none were dose dependent, and no significant differences were observed between active treatment and placebo. Biochemistry, urinalysis, vital signs, electrocardiogram, and hematology did not change significantly with dose escalation, with the exception of a transient reduction of platelet counts in an extra dose level incorporated for that purpose. Vafidemstat exhibits rapid oral absorption, approximate dose-proportional exposures, and moderate systemic accumulation after 5 days of treatment. The cerebrospinal fluid-to-plasma unbound ratio demonstrated CNS penetration. Vafidemstat bound KDM1A in PBMCs in a dose-dependent manner. No MAOB inhibition was detected. Vafidemstat did not affect the CNS or cognitive function. CONCLUSIONS Vafidemstat displayed good safety and tolerability. This phase I trial confirmed KDM1A TE and CNS penetration and permitted characterization of platelet dynamics and selection of phase IIa doses. TRIAL REGISTRATION EUDRACT No. 2015-003721-33, filed 30 October 2015.
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Affiliation(s)
- Rosa María Antonijoan
- Centre d'Investigació del Medicament, Institut de Recerca de l'Hospital de la Santa Creu i Sant Pau (IIB-Sant Pau), Barcelona, Spain
- Pharmacology and Therapeutics Department, Universitat Autònoma de Barcelona (UAB), Bellaterra, Spain
| | - Juan Manuel Ferrero-Cafiero
- Centre d'Investigació del Medicament, Institut de Recerca de l'Hospital de la Santa Creu i Sant Pau (IIB-Sant Pau), Barcelona, Spain
| | - Jimena Coimbra
- Centre d'Investigació del Medicament, Institut de Recerca de l'Hospital de la Santa Creu i Sant Pau (IIB-Sant Pau), Barcelona, Spain
| | - Montse Puntes
- Centre d'Investigació del Medicament, Institut de Recerca de l'Hospital de la Santa Creu i Sant Pau (IIB-Sant Pau), Barcelona, Spain
| | - Joan Martínez-Colomer
- Centre d'Investigació del Medicament, Institut de Recerca de l'Hospital de la Santa Creu i Sant Pau (IIB-Sant Pau), Barcelona, Spain
| | - María Isabel Arévalo
- Oryzon Genomics S.A. Carrer Sant Ferran 74, Cornellà de Llobregat, 08940, Barcelona, Spain
| | - Cristina Mascaró
- Oryzon Genomics S.A. Carrer Sant Ferran 74, Cornellà de Llobregat, 08940, Barcelona, Spain
| | - Cesar Molinero
- Oryzon Genomics S.A. Carrer Sant Ferran 74, Cornellà de Llobregat, 08940, Barcelona, Spain
| | - Carlos Buesa
- Oryzon Genomics S.A. Carrer Sant Ferran 74, Cornellà de Llobregat, 08940, Barcelona, Spain
| | - Tamara Maes
- Oryzon Genomics S.A. Carrer Sant Ferran 74, Cornellà de Llobregat, 08940, Barcelona, Spain.
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Mahy W, Willis NJ, Zhao Y, Woodward HL, Svensson F, Sipthorp J, Vecchia L, Ruza RR, Hillier J, Kjær S, Frew S, Monaghan A, Bictash M, Salinas PC, Whiting P, Vincent JP, Jones EY, Fish PV. 5-Phenyl-1,3,4-oxadiazol-2(3 H)-ones Are Potent Inhibitors of Notum Carboxylesterase Activity Identified by the Optimization of a Crystallographic Fragment Screening Hit. J Med Chem 2020; 63:12942-12956. [PMID: 33124429 DOI: 10.1021/acs.jmedchem.0c01391] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Carboxylesterase Notum is a negative regulator of the Wnt signaling pathway. There is an emerging understanding of the role Notum plays in disease, supporting the need to discover new small-molecule inhibitors. A crystallographic X-ray fragment screen was performed, which identified fragment hit 1,2,3-triazole 7 as an attractive starting point for a structure-based drug design hit-to-lead program. Optimization of 7 identified oxadiazol-2-one 23dd as a preferred example with properties consistent with drug-like chemical space. Screening 23dd in a cell-based TCF/LEF reporter gene assay restored the activation of Wnt signaling in the presence of Notum. Mouse pharmacokinetic studies with oral administration of 23dd demonstrated good plasma exposure and partial blood-brain barrier penetration. Significant progress was made in developing fragment hit 7 into lead 23dd (>600-fold increase in activity), making it suitable as a new chemical tool for exploring the role of Notum-mediated regulation of Wnt signaling.
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Affiliation(s)
- William Mahy
- Alzheimer's Research UK UCL Drug Discovery Institute, University College London, Cruciform Building, Gower Street, London WC1E 6BT, U.K
| | - Nicky J Willis
- Alzheimer's Research UK UCL Drug Discovery Institute, University College London, Cruciform Building, Gower Street, London WC1E 6BT, U.K
| | - Yuguang Zhao
- Division of Structural Biology, Wellcome Centre for Human Genetics, University of Oxford, The Henry Wellcome Building for Genomic Medicine, Roosevelt Drive, Oxford OX3 7BN, U.K
| | - Hannah L Woodward
- Alzheimer's Research UK UCL Drug Discovery Institute, University College London, Cruciform Building, Gower Street, London WC1E 6BT, U.K
| | - Fredrik Svensson
- Alzheimer's Research UK UCL Drug Discovery Institute, University College London, Cruciform Building, Gower Street, London WC1E 6BT, U.K
- The Francis Crick Institute, 1 Midland Road, Kings Cross, London NW1 1AT, U.K
| | - James Sipthorp
- Alzheimer's Research UK UCL Drug Discovery Institute, University College London, Cruciform Building, Gower Street, London WC1E 6BT, U.K
- The Francis Crick Institute, 1 Midland Road, Kings Cross, London NW1 1AT, U.K
| | - Luca Vecchia
- Division of Structural Biology, Wellcome Centre for Human Genetics, University of Oxford, The Henry Wellcome Building for Genomic Medicine, Roosevelt Drive, Oxford OX3 7BN, U.K
| | - Reinis R Ruza
- Division of Structural Biology, Wellcome Centre for Human Genetics, University of Oxford, The Henry Wellcome Building for Genomic Medicine, Roosevelt Drive, Oxford OX3 7BN, U.K
| | - James Hillier
- Division of Structural Biology, Wellcome Centre for Human Genetics, University of Oxford, The Henry Wellcome Building for Genomic Medicine, Roosevelt Drive, Oxford OX3 7BN, U.K
| | - Svend Kjær
- The Francis Crick Institute, 1 Midland Road, Kings Cross, London NW1 1AT, U.K
| | - Sarah Frew
- Alzheimer's Research UK UCL Drug Discovery Institute, University College London, Cruciform Building, Gower Street, London WC1E 6BT, U.K
| | - Amy Monaghan
- Alzheimer's Research UK UCL Drug Discovery Institute, University College London, Cruciform Building, Gower Street, London WC1E 6BT, U.K
| | - Magda Bictash
- Alzheimer's Research UK UCL Drug Discovery Institute, University College London, Cruciform Building, Gower Street, London WC1E 6BT, U.K
| | - Patricia C Salinas
- Department of Cell and Developmental Biology, Laboratory for Molecular and Cellular Biology, University College London, London WC1E 6BT, U.K
| | - Paul Whiting
- Alzheimer's Research UK UCL Drug Discovery Institute, University College London, Cruciform Building, Gower Street, London WC1E 6BT, U.K
| | - Jean-Paul Vincent
- The Francis Crick Institute, 1 Midland Road, Kings Cross, London NW1 1AT, U.K
| | - E Yvonne Jones
- Division of Structural Biology, Wellcome Centre for Human Genetics, University of Oxford, The Henry Wellcome Building for Genomic Medicine, Roosevelt Drive, Oxford OX3 7BN, U.K
| | - Paul V Fish
- Alzheimer's Research UK UCL Drug Discovery Institute, University College London, Cruciform Building, Gower Street, London WC1E 6BT, U.K
- The Francis Crick Institute, 1 Midland Road, Kings Cross, London NW1 1AT, U.K
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Kristeleit R, Evans J, Molife LR, Tunariu N, Shaw H, Slater S, Haris NRM, Brown NF, Forster MD, Diamantis N, Rulach R, Greystoke A, Asghar U, Rata M, Anderson S, Bachmann F, Hannah A, Kaindl T, Lane HA, Larger PJ, Schmitt-Hoffmann A, Engelhardt M, Tzankov A, Plummer R, Lopez J. Phase 1/2a trial of intravenous BAL101553, a novel controller of the spindle assembly checkpoint, in advanced solid tumours. Br J Cancer 2020; 123:1360-1369. [PMID: 32741975 PMCID: PMC7591872 DOI: 10.1038/s41416-020-1010-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2019] [Revised: 06/29/2020] [Accepted: 07/16/2020] [Indexed: 11/09/2022] Open
Abstract
BACKGROUND BAL101553 (lisavanbulin), the lysine prodrug of BAL27862 (avanbulin), exhibits broad anti-proliferative activity in human cancer models refractory to clinically relevant microtubule-targeting agents. METHODS This two-part, open-label, phase 1/2a study aimed to determine the maximum tolerated dose (MTD) and dose-limiting toxicities (DLTs) of 2-h infusion of BAL101553 in adults with advanced or recurrent solid tumours. The MTD was determined using a modified accelerated titration design in phase I. Patients received BAL101553 at the MTD and at lower doses in the phase 2a expansion to characterise safety and efficacy and to determine the recommended phase 2 dose (RP2D). RESULTS Seventy-three patients received BAL101553 at doses of 15-80 mg/m2 (phase 1, n = 24; phase 2a, n = 49). The MTD was 60 mg/m2; DLTs observed at doses ≥60 mg/m2 were reversible Grade 2-3 gait disturbance with Grade 2 peripheral sensory neuropathy. In phase 2a, asymptomatic myocardial injury was observed at doses ≥45 mg/m2. The RP2D for 2-h intravenous infusion was 30 mg/m2. The overall disease control rate was 26.3% in the efficacy population. CONCLUSIONS The RP2D for 2-h infusion of BAL101553 was well tolerated. Dose-limiting neurological and myocardial side effects were consistent with the agent's vascular-disrupting properties. CLINICAL TRIAL REGISTRATION EudraCT: 2010-024237-23.
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Affiliation(s)
- Rebecca Kristeleit
- Department of Oncology, Guys and St Thomas' NHS Foundation Trust, London, UK.
- National Institute for Health Research, University College London Hospitals Clinical Research Facility, London, UK.
| | - Jeffry Evans
- University of Glasgow, Glasgow, UK
- The Beatson West of Scotland Cancer Centre, Glasgow, UK
| | - L Rhoda Molife
- Drug Development Unit, The Royal Marsden Hospital and the Institute of Cancer Research, Sutton, UK
| | - Nina Tunariu
- Drug Development Unit, The Royal Marsden Hospital and the Institute of Cancer Research, Sutton, UK
| | - Heather Shaw
- National Institute for Health Research, University College London Hospitals Clinical Research Facility, London, UK
| | - Sarah Slater
- The Beatson West of Scotland Cancer Centre, Glasgow, UK
| | - Noor R Md Haris
- Sir Bobby Robson Cancer Trials Research Centre, Northern Centre for Cancer Care, Freeman Hospital, Newcastle upon Tyne, UK
| | - Nicholas F Brown
- National Institute for Health Research, University College London Hospitals Clinical Research Facility, London, UK
| | - Martin D Forster
- National Institute for Health Research, University College London Hospitals Clinical Research Facility, London, UK
| | - Nikolaos Diamantis
- Drug Development Unit, The Royal Marsden Hospital and the Institute of Cancer Research, Sutton, UK
| | - Robert Rulach
- The Beatson West of Scotland Cancer Centre, Glasgow, UK
| | - Alastair Greystoke
- Sir Bobby Robson Cancer Trials Research Centre, Northern Centre for Cancer Care, Freeman Hospital, Newcastle upon Tyne, UK
- Newcastle University, Newcastle upon Tyne, UK
| | - Uzma Asghar
- National Institute for Health Research, University College London Hospitals Clinical Research Facility, London, UK
| | - Mihaela Rata
- Radiotherapy and Imaging Unit, Institute of Cancer Research and Royal Marsden Hospital, Sutton, UK
| | | | - Felix Bachmann
- Basilea Pharmaceutica International Ltd, Basel, Switzerland
| | - Alison Hannah
- Oncology Clinical Trial Consulting, Sebastopol, CA, USA
| | - Thomas Kaindl
- Basilea Pharmaceutica International Ltd, Basel, Switzerland
| | - Heidi A Lane
- Basilea Pharmaceutica International Ltd, Basel, Switzerland
| | | | | | | | | | - Ruth Plummer
- Sir Bobby Robson Cancer Trials Research Centre, Northern Centre for Cancer Care, Freeman Hospital, Newcastle upon Tyne, UK
- Newcastle University, Newcastle upon Tyne, UK
| | - Juanita Lopez
- Drug Development Unit, The Royal Marsden Hospital and the Institute of Cancer Research, Sutton, UK
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7
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Ozanimod (Zeposia) for multiple sclerosis. Med Lett Drugs Ther 2020; 62:132-4. [PMID: 32970043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
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8
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Tsuruoka S, Endo T, Seo M, Hashimoto N. Pharmacokinetics and Dialyzability of a Single Oral Dose of Amenamevir, an Anti-Herpes Drug, in Hemodialysis Patients. Adv Ther 2020; 37:3234-3245. [PMID: 32440976 PMCID: PMC7467425 DOI: 10.1007/s12325-020-01375-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2020] [Indexed: 11/29/2022]
Abstract
Introduction Amenamevir (ASP2151), a herpesvirus helicase-primase inhibitor, is currently used for the treatment of herpes zoster in Japan. Amenamevir is mainly metabolized in the liver, and urinary excretion of amenamevir is approximately 10% in healthy adults. The increase of systemic exposure in non-dialysis patients with severe renal impairment was much less than that associated with nucleoside antiviral agents. The aim of this study was to evaluate the pharmacokinetics and dialyzability of a single oral dose (400 mg) of amenamevir in hemodialysis patients. Methods This was a single-arm, open-label, multicenter clinical pharmacology study. Nine patients aged 20–80 years with end-stage kidney disease and undergoing maintenance hemodialysis three times weekly were enrolled. Pharmacokinetics and dialyzability were investigated by serial collection of blood samples until 48 h post-dose during the study. Results The maximum plasma concentration and time to reach maximum plasma concentration during 24 h post-dose were 1585 ng/mL and 6.2 h, respectively. The area under the plasma concentration–time curve (AUC) from time zero to 24 h was 23,890 ng h/mL. The median terminal elimination half-life within 24 h before, during, and after hemodialysis was 14.7, 15.2, and 12.4 h, respectively. The AUC in hemodialysis patients was approximately double that in healthy adults. This increase in AUC was much less than that reported in nucleoside antiviral agents. The hemodialysis clearance, elimination fraction percentage, and amount of amenamevir removed were 37.8 mL/min, 28.1%, and 132.0 μg, respectively. The amount of amenamevir removed by hemodialysis was minimal. None of the hemodialysis parameters were associated with serum albumin. This study revealed no clinically relevant safety concerns. Conclusion There were no clinically relevant safety concerns when 400 mg of amenamevir was administered as a single dose to hemodialysis patients without dose adjustment and/or modification of the dosing schedule. Trial Registration JapicCTI-184242. Electronic Supplementary Material The online version of this article (10.1007/s12325-020-01375-1) contains supplementary material, which is available to authorized users.
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Affiliation(s)
| | - Takamasa Endo
- Clinical Development Department, Maruho Co., Ltd., Kyoto, Japan.
| | - Mizuna Seo
- Clinical Development Department, Maruho Co., Ltd., Kyoto, Japan
| | - Naoto Hashimoto
- Drug Development Research Laboratory, Maruho Co., Ltd., Kyoto, Japan
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Maes T, Mascaró C, Rotllant D, Lufino MMP, Estiarte A, Guibourt N, Cavalcanti F, Griñan-Ferré C, Pallàs M, Nadal R, Armario A, Ferrer I, Ortega A, Valls N, Fyfe M, Martinell M, Castro Palomino JC, Buesa Arjol C. Modulation of KDM1A with vafidemstat rescues memory deficit and behavioral alterations. PLoS One 2020; 15:e0233468. [PMID: 32469975 PMCID: PMC7259601 DOI: 10.1371/journal.pone.0233468] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2020] [Accepted: 05/05/2020] [Indexed: 12/15/2022] Open
Abstract
Transcription disequilibria are characteristic of many neurodegenerative diseases. The activity-evoked transcription of immediate early genes (IEGs), important for neuronal plasticity, memory and behavior, is altered in CNS diseases and governed by epigenetic modulation. KDM1A, a histone 3 lysine 4 demethylase that forms part of transcription regulation complexes, has been implicated in the control of IEG transcription. Here we report the development of vafidemstat (ORY-2001), a brain penetrant inhibitor of KDM1A and MAOB. ORY-2001 efficiently inhibits brain KDM1A at doses suitable for long term treatment, and corrects memory deficit as assessed in the novel object recognition testing in the Senescence Accelerated Mouse Prone 8 (SAMP8) model for accelerated aging and Alzheimer’s disease. Comparison with a selective KDM1A or MAOB inhibitor reveals that KDM1A inhibition is key for efficacy. ORY-2001 further corrects behavior alterations including aggression and social interaction deficits in SAMP8 mice and social avoidance in the rat rearing isolation model. ORY-2001 increases the responsiveness of IEGs, induces genes required for cognitive function and reduces a neuroinflammatory signature in SAMP8 mice. Multiple genes modulated by ORY-2001 are differentially expressed in Late Onset Alzheimer’s Disease. Most strikingly, the amplifier of inflammation S100A9 is highly expressed in LOAD and in the hippocampus of SAMP8 mice, and down-regulated by ORY-2001. ORY-2001 is currently in multiple Phase IIa studies.
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Affiliation(s)
- Tamara Maes
- Oryzon Genomics, S.A., Cornellà de Llobregat, Spain
- * E-mail:
| | | | | | | | | | | | | | - Christian Griñan-Ferré
- Faculty of Pharmacy and Food Sciences, Institute of Neuroscience, University of Barcelona, Barcelona, Spain
| | - Mercè Pallàs
- Faculty of Pharmacy and Food Sciences, Institute of Neuroscience, University of Barcelona, Barcelona, Spain
| | - Roser Nadal
- Institut de Neurociències, Universitat Autònoma de Barcelona, Bellaterra, Spain
| | - Antonio Armario
- Institut de Neurociències, Universitat Autònoma de Barcelona, Bellaterra, Spain
| | - Isidro Ferrer
- Institut de Neuropatologia, Servei Anatomia Patologica, IDIBELL-Hospital Universitari de Bellvitge, L’Hospitalet de Llobregat, Spain
| | | | - Nuria Valls
- Oryzon Genomics, S.A., Cornellà de Llobregat, Spain
| | - Matthew Fyfe
- Oryzon Genomics, S.A., Cornellà de Llobregat, Spain
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10
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Enya K, Saji BT, Kato T, Okamoto H, Koumura E. Pharmacokinetics of a Single Dose of Azilsartan in Pediatric Patients: A Phase 3, Open-Label, Multicenter Study. Adv Ther 2018; 35:1181-1190. [PMID: 30027478 PMCID: PMC6096965 DOI: 10.1007/s12325-018-0754-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2018] [Indexed: 12/17/2022]
Abstract
INTRODUCTION Azilsartan is an angiotensin II receptor blocker indicated for the treatment of patients with hypertension. The efficacy and safety of azilsartan are established in adults, but have not been evaluated in pediatric patients, nor has its pharmacokinetic profile been determined in pediatric patients. METHODS In this phase 3, open-label, multicenter study, we investigated the pharmacokinetics and safety of single doses of azilsartan in six Japanese patients with hypertension, aged 9-14 years. The dose of azilsartan was 5 mg for three patients weighing less than 50 kg, with mean body weight at baseline of 27.5 kg, and 10 mg for three patients weighing at least 50 kg, with mean body weight at baseline of 65.9 kg. RESULTS Mean maximum plasma concentration (Cmax) of azilsartan was 888.3 and 831.3 ng/mL and median time to maximum concentration (Tmax) of unchanged azilsartan was 3.0 and 4.0 h, in the 5-mg and 10-mg groups, respectively. Mean areas under the plasma concentration-time curve (AUC) from 0-24 h post-dose (AUC0-24) and 0 h to infinity (AUC0-inf) were 6350.3 and 6635.7 ng h/mL, respectively, in the 5-mg group, and 6871.7 and 7433.3 ng h/mL, respectively, in the 10-mg group. Both doses were well tolerated; no treatment-emergent adverse events considered to be related to azilsartan occurred during the study. CONCLUSION Our data suggest that pediatric patients weighing less than 50 kg may have approximately 2-fold greater exposure to azilsartan than those weighing at least 50 kg at the same dose. Exposure to azilsartan in children weighing at least 50 kg is comparable to that in healthy adults at the same dose. TRIAL REGISTRATION ClinicalTrials.gov identifier, NCT02451150. FUNDING Takeda Pharmaceutical Co. Ltd.
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Affiliation(s)
- Kazuaki Enya
- Japan Development Center, Takeda Pharmaceutical Co. Ltd, Osaka, Japan.
| | - Ben T Saji
- First Department of Pediatrics, Toho University Omori Medical Center, Tokyo, Japan
| | - Takuya Kato
- Formerly Japan Development Center, Takeda Pharmaceutical Co. Ltd, Osaka, Japan
| | - Hiroyuki Okamoto
- Formerly Japan Development Center, Takeda Pharmaceutical Co. Ltd, Osaka, Japan
| | - Emiko Koumura
- Japan Development Center, Takeda Pharmaceutical Co. Ltd, Osaka, Japan
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11
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Maynard J, Emmas SA, Ble FX, Barjat H, Lawrie E, Hancox U, Polanska UM, Pritchard A, Hudson K. The use of 18F-Fluoro-deoxy-glucose positron emission tomography (18F-FDG PET) as a non-invasive pharmacodynamic biomarker to determine the minimally pharmacologically active dose of AZD8835, a novel PI3Kα inhibitor. PLoS One 2017; 12:e0183048. [PMID: 28806782 PMCID: PMC5555689 DOI: 10.1371/journal.pone.0183048] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2017] [Accepted: 07/30/2017] [Indexed: 12/18/2022] Open
Abstract
BACKGROUND The phosphatidyl inositol 3 kinase (PI3K), AKT and mammalian target of rapamycin (mTOR) signal transduction pathway is frequently de-regulated and activated in human cancer and is an important therapeutic target. AZD8835 is a PI3K inhibitor, with selectivity against PI3K α and δ isoforms, which is currently in Phase 1 clinical trials. 18F-Fluoro-deoxy-glucose positron emission tomography (18F-FDG PET) is a non-invasive pharmacodynamic imaging biomarker that has become an integral part of drug development. It has been used widely with PI3K inhibitors both clinically and pre-clinically because of the role of the PI3K pathway in glucose metabolism. In this study we investigated the potential of 18F-FDG PET as a non-invasive pharmacodynamic biomarker for AZD8835. We sought to understand if 18F-FDG PET could determine the minimally effective dose of AZD8835 and correlate with other pharmacodynamic biomarkers for validation of its use in clinical development. 18F-FDG PET scans were performed in nude mice in the BT474C breast xenograft model. Mice were fasted prior to imaging and static 18F-FDG PET was performed. Treatment groups received AZD8835 by oral gavage at a dose volume of 10ml/kg. Treatment groups received either 3, 6, 12.5, 25 or 50mg/kg AZD8835. Tumour growth was monitored throughout the study, and at the end of the imaging procedure, tumours were taken and a full pharmacodynamic analysis was performed. RESULTS Results showed that AZD8835 reduced 18F-FDG uptake at a dose of 12.5, 25 and 50mg/kg with no significant reduction at doses of 3 and 6mg/kg. These results were consistent with other pharmacodynamics biomarkers measured and show 18F-FDG PET as a sensitive biomarker with the ability to determine the minimal effective dose of AZD8835. CONCLUSIONS Our pre-clinical studies support the use of 18F-FDG PET imaging as a sensitive and non- invasive pharmacodynamic biomarker (understanding the role of PI3K signalling in glucose uptake) for AZD8835 with a decrease in 18F-FDG uptake observed at only two hours post treatment. The decrease in 18F-FDG uptake was dose dependent and data showed excellent PK/PD correlation. This data supports and parallels observations obtained with this class of compounds in patients.
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Affiliation(s)
- Juliana Maynard
- Personalised Healthcare & Biomarkers, AstraZeneca, Cheshire, United Kingdom
- * E-mail:
| | - Sally-Ann Emmas
- Personalised Healthcare & Biomarkers, AstraZeneca, Cheshire, United Kingdom
| | | | - Herve Barjat
- Personalised Healthcare & Biomarkers, AstraZeneca, Cheshire, United Kingdom
| | - Emily Lawrie
- Drug Safety and Metabolism iMED, AstraZeneca, Cheshire, United Kingdom
| | - Urs Hancox
- Oncology Imed, Astrazenenca, Cheshire, United Kingdom
| | | | | | - Kevin Hudson
- Oncology Imed, Astrazenenca, Cheshire, United Kingdom
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12
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Rocha J, Sicard É, Fauchoux N, Falcão A, Santos A, Loureiro AI, Pinto R, Bonifácio MJ, Nunes T, Almeida L, Soares‐da‐Silva P. Effect of opicapone multiple-dose regimens on levodopa pharmacokinetics. Br J Clin Pharmacol 2017; 83:540-553. [PMID: 27763682 PMCID: PMC5306497 DOI: 10.1111/bcp.13156] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2016] [Revised: 09/24/2016] [Accepted: 10/02/2016] [Indexed: 01/15/2023] Open
Abstract
AIMS To compare the levodopa/carbidopa (LC) and levodopa/benserazide (LB) pharmacokinetic profiles following repeated doses of opicapone (OPC) administered apart from levodopa. METHODS Two randomized, double blind, sex-balanced, placebo-controlled studies in four groups of 12 or 18 healthy subjects each. In each group, enrolled subjects received a once-daily morning (5, 15 and 30 mg) or evening (5, 15 and 50 mg) administration of OPC or placebo for up to 28 days. On the morning of Day 11, 12 h after the OPC or placebo evening dose, or the morning of Day 21, 1 h after the OPC or placebo dose, a single dose of immediate-release 100/25 mg LC was administered. Similarly, on Day 18 morning, 12 h after the OPC or placebo evening dose, or Day 28 morning, 1 h after the OPC or placebo dose, a single dose of immediate-release 100/25 mg LB was administered. RESULTS All OPC treatments, in relation to the placebo group, presented a higher extent of exposure (AUC) to levodopa following either LC or LB doses. A relevant but not dose-dependent increase in the levodopa AUC occurred with all OPC dose groups in relation to placebo. All active treatments significantly inhibited both peak (Emax ) and extent (AUEC) of the catechol-O-methyltransferase activity in relation to placebo. The tolerability profile was favourable. CONCLUSION Opicapone, as once-daily oral evening regimen and/or 1 h apart from levodopa therapy, increases the bioavailability of levodopa associated with its pronounced, long-lasting and sustained catechol-O-methyltransferase inhibition. The tolerability profile was favourable and similar between OPC and placebo.
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Affiliation(s)
- José‐Francisco Rocha
- Dept. Research & DevelopmentBIAL – Portela & Cª – S.A.4745‐457S. Mamede do CoronadoPortugal
| | | | | | | | - Ana Santos
- Dept. Research & DevelopmentBIAL – Portela & Cª – S.A.4745‐457S. Mamede do CoronadoPortugal
| | - Ana I. Loureiro
- Dept. Research & DevelopmentBIAL – Portela & Cª – S.A.4745‐457S. Mamede do CoronadoPortugal
| | - Roberto Pinto
- Dept. Research & DevelopmentBIAL – Portela & Cª – S.A.4745‐457S. Mamede do CoronadoPortugal
- Dept. Pharmacology & Therapeutics, Faculty of MedicineUniversity of PortoPortoPortugal
| | - Maria João Bonifácio
- Dept. Research & DevelopmentBIAL – Portela & Cª – S.A.4745‐457S. Mamede do CoronadoPortugal
| | - Teresa Nunes
- Dept. Research & DevelopmentBIAL – Portela & Cª – S.A.4745‐457S. Mamede do CoronadoPortugal
| | - Luís Almeida
- Dept. Pharmacology & Therapeutics, Faculty of MedicineUniversity of PortoPortoPortugal
- MedInUP ‐ Center for Drug Discovery and Innovative MedicinesUniversity of PortoPortoPortugal
| | - Patrício Soares‐da‐Silva
- Dept. Research & DevelopmentBIAL – Portela & Cª – S.A.4745‐457S. Mamede do CoronadoPortugal
- Dept. Pharmacology & Therapeutics, Faculty of MedicineUniversity of PortoPortoPortugal
- MedInUP ‐ Center for Drug Discovery and Innovative MedicinesUniversity of PortoPortoPortugal
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13
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Takada A, Katashima M, Kaibara A, Chono K, Katsumata K, Sawamoto T, Suzuki H, Yano Y. Integrative pharmacokinetic-pharmacodynamic modeling and simulation of amenamevir (ASP2151) for treatment of recurrent genital herpes. Drug Metab Pharmacokinet 2016; 31:323-32. [PMID: 27461507 DOI: 10.1016/j.dmpk.2016.05.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2015] [Revised: 05/20/2016] [Accepted: 05/27/2016] [Indexed: 11/17/2022]
Abstract
Amenamevir is a novel drug that targets the viral helicase-primase complex. While dose-dependent efficacy had been observed in non-clinical studies, no clear dose dependence has been observed in humans. We therefore developed a pharmacokinetic/pharmacodynamic (PK/PD) model to explain this inconsistency between species and to clarify the immune-related healing of amenamevir in humans. The model consisted of a non-linear kinetic model for a virtual number of virus plaques as a built-in biomarker. Lesion score was defined as an endpoint of antiviral efficacy, and logit model analysis was applied to the ordered-categorical lesion score. The modeling results suggested the time course profiles of lesion score could be explained with the efficacy terms in the logit model, using change in number of virus plaques as an indicator of the effects of amenamevir and time elapsed as an indicator of the healing of the immune response. In humans, the PD effect was almost dose-independent, and immune-related healing may have been the driving force behind the reduction in lesion scores. Drug efficacy is occasionally masked in diseases healed by the immune response, such as genital herpes. The PK/PD model proposed in the present study must be useful for explanation the PK/PD relationship of such drugs.
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Affiliation(s)
- Akitsugu Takada
- Astellas Pharma Inc., 2-5-1 Nihonbashi-Honcho, Chuo-ku, Tokyo, Japan.
| | | | - Atsunori Kaibara
- Astellas Pharma Inc., 2-5-1 Nihonbashi-Honcho, Chuo-ku, Tokyo, Japan
| | - Koji Chono
- Astellas Pharma Inc., 2-5-1 Nihonbashi-Honcho, Chuo-ku, Tokyo, Japan
| | | | - Taiji Sawamoto
- Astellas Pharma Inc., 2-5-1 Nihonbashi-Honcho, Chuo-ku, Tokyo, Japan
| | - Hiroshi Suzuki
- Astellas Pharma Inc., 2-5-1 Nihonbashi-Honcho, Chuo-ku, Tokyo, Japan
| | - Yoshitaka Yano
- Kyoto Pharmaceutical University, 5 Misasagi-Nakauchicho, Yamashina-ku, Kyoto, Japan
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14
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Dargad RR, Parekh JD, Dargad RR, Kukrety S. Azilsartan: Novel Angiotensin Receptor Blocker. J Assoc Physicians India 2016; 64:96-98. [PMID: 27731574] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
OBJECTIVE To describe the efficacy and safety profile of the new angiotensin receptor blocker (ARB), "Azilsartan Medoxomil", reviewing data available from both clinical and pre-clinical studies. MATERIAL We completed a review of the English literature from PubMed using the keywords- azilsartan medoxomil, angiotensin receptor blockers (ARB), angiotensin converting enzyme inhibitors (ACEi) and hypertension. DATA EVALUATION Many clinical trials have been conducted comparing the efficacy of azilsartan with other ARB's and also with the ACEi ramipril. The trials have shown azilsartan to be more effective in reducing the mean 24-hour systolic blood pressure compared to its counterparts. CONCLUSIONS Azilsartan is a recently approved ARB and appears to be more efficacious in reducing blood pressure (BP) than the other ARBs with a similar safety and tolerability profile. Azilsartan's very high affinity to and slow dissociation from the angiotensin 1 receptor (AT1R) along with its inverse agonistic properties make it a very good candidate for clinical effects beyond simple BP control, potentially counteracting cardiac hypertrophy, cardiac fibrosis and insulin resistance, together with improved reno-protection and atherosclerotic plaque stabilization.
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Affiliation(s)
- Ramesh R Dargad
- Consulting Physician and Cardiologist, Lilavati, Seven Hills and L.H. Hiranandani Hospital
| | - Jai D Parekh
- Medical Graduate, B.J. Medical College, Pune, Maharashtra
| | - Rohit R Dargad
- Senior Registrar, ICU-Fortis Hospital, Mumbai, Maharashtra
| | - Shweta Kukrety
- Internal Medicine Resident, Creighton University, Nebraska, USA
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15
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Turcu AF, Spencer-Segal JL, Farber RH, Luo R, Grigoriadis DE, Ramm CA, Madrigal D, Muth T, O'Brien CF, Auchus RJ. Single-Dose Study of a Corticotropin-Releasing Factor Receptor-1 Antagonist in Women With 21-Hydroxylase Deficiency. J Clin Endocrinol Metab 2016; 101:1174-80. [PMID: 26751191 PMCID: PMC4803170 DOI: 10.1210/jc.2015-3574] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/30/2015] [Accepted: 12/31/2015] [Indexed: 02/05/2023]
Abstract
CONTEXT Treatment of 21-hydroxylase deficiency (21OHD) is difficult to optimize. Normalization of excessive ACTH and adrenal steroid production commonly requires supraphysiologic doses of glucocorticoids. OBJECTIVES We evaluated the safety and tolerability of the selective corticotropin releasing factor type 1 (CRF1) receptor antagonist NBI-77860 in women with classic 21OHD and tested the hypothesis that CRF1 receptor blockade decreases early-morning ACTH and 17α-hydroxyprogesterone (17OHP) in these patients. PARTICIPANTS The study enrolled eight classic 21OHD females, ages 18-58 years, seen at a single tertiary referral university setting. DESIGN This was a phase Ib, single-blind, placebo-controlled, fixed-sequence, single-dose trial. During three treatment periods separated by 3-week washout intervals, patients sequentially received placebo, NBI-77860 300 mg, and NBI-77860 600 mg at 10 pm; glucocorticoid therapy was withheld for 20 hours. We evaluated ACTH, 17OHP, androstenedione, and testosterone as well as NBI-77860 pharmacokinetics over 24 hours. RESULTS Dose-dependent reductions of ACTH and/or 17OHP were observed in six of eight subjects. Relative to placebo, NBI-77860 led to an ACTH and 17OHP reduction by a mean of 43% and 0.7% for the 300 mg dose, respectively, and by 41% and 27% for the 600 mg dose, respectively. Both NBI-77860 doses were well tolerated. CONCLUSION The meaningful reductions in ACTH and 17OHP following NBI-77860 dosing in 21OHD patients demonstrate target engagement and proof of principle in this disorder. These promising data provide a rationale for additional investigations of CRF1 receptor antagonists added to physiologic doses of hydrocortisone and fludrocortisone acetate for the treatment of classic 21OHD.
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Affiliation(s)
- Adina F Turcu
- Division of Metabolism, Endocrinology and Diabetes, Department of Internal Medicine (A.F.T., J.L.S.-S., C.A.R., D.M., T.M., R.J.A.), and Department of Pharmacology (R.J.A.), University of Michigan, Ann Arbor, Michigan 48109; and Neurocrine Biosciences (R.H.F., R.L., D.E.G., C.F.O.), San Diego, California 92130
| | - Joanna L Spencer-Segal
- Division of Metabolism, Endocrinology and Diabetes, Department of Internal Medicine (A.F.T., J.L.S.-S., C.A.R., D.M., T.M., R.J.A.), and Department of Pharmacology (R.J.A.), University of Michigan, Ann Arbor, Michigan 48109; and Neurocrine Biosciences (R.H.F., R.L., D.E.G., C.F.O.), San Diego, California 92130
| | - Robert H Farber
- Division of Metabolism, Endocrinology and Diabetes, Department of Internal Medicine (A.F.T., J.L.S.-S., C.A.R., D.M., T.M., R.J.A.), and Department of Pharmacology (R.J.A.), University of Michigan, Ann Arbor, Michigan 48109; and Neurocrine Biosciences (R.H.F., R.L., D.E.G., C.F.O.), San Diego, California 92130
| | - Rosa Luo
- Division of Metabolism, Endocrinology and Diabetes, Department of Internal Medicine (A.F.T., J.L.S.-S., C.A.R., D.M., T.M., R.J.A.), and Department of Pharmacology (R.J.A.), University of Michigan, Ann Arbor, Michigan 48109; and Neurocrine Biosciences (R.H.F., R.L., D.E.G., C.F.O.), San Diego, California 92130
| | - Dimitri E Grigoriadis
- Division of Metabolism, Endocrinology and Diabetes, Department of Internal Medicine (A.F.T., J.L.S.-S., C.A.R., D.M., T.M., R.J.A.), and Department of Pharmacology (R.J.A.), University of Michigan, Ann Arbor, Michigan 48109; and Neurocrine Biosciences (R.H.F., R.L., D.E.G., C.F.O.), San Diego, California 92130
| | - Carole A Ramm
- Division of Metabolism, Endocrinology and Diabetes, Department of Internal Medicine (A.F.T., J.L.S.-S., C.A.R., D.M., T.M., R.J.A.), and Department of Pharmacology (R.J.A.), University of Michigan, Ann Arbor, Michigan 48109; and Neurocrine Biosciences (R.H.F., R.L., D.E.G., C.F.O.), San Diego, California 92130
| | - David Madrigal
- Division of Metabolism, Endocrinology and Diabetes, Department of Internal Medicine (A.F.T., J.L.S.-S., C.A.R., D.M., T.M., R.J.A.), and Department of Pharmacology (R.J.A.), University of Michigan, Ann Arbor, Michigan 48109; and Neurocrine Biosciences (R.H.F., R.L., D.E.G., C.F.O.), San Diego, California 92130
| | - Tim Muth
- Division of Metabolism, Endocrinology and Diabetes, Department of Internal Medicine (A.F.T., J.L.S.-S., C.A.R., D.M., T.M., R.J.A.), and Department of Pharmacology (R.J.A.), University of Michigan, Ann Arbor, Michigan 48109; and Neurocrine Biosciences (R.H.F., R.L., D.E.G., C.F.O.), San Diego, California 92130
| | - Christopher F O'Brien
- Division of Metabolism, Endocrinology and Diabetes, Department of Internal Medicine (A.F.T., J.L.S.-S., C.A.R., D.M., T.M., R.J.A.), and Department of Pharmacology (R.J.A.), University of Michigan, Ann Arbor, Michigan 48109; and Neurocrine Biosciences (R.H.F., R.L., D.E.G., C.F.O.), San Diego, California 92130
| | - Richard J Auchus
- Division of Metabolism, Endocrinology and Diabetes, Department of Internal Medicine (A.F.T., J.L.S.-S., C.A.R., D.M., T.M., R.J.A.), and Department of Pharmacology (R.J.A.), University of Michigan, Ann Arbor, Michigan 48109; and Neurocrine Biosciences (R.H.F., R.L., D.E.G., C.F.O.), San Diego, California 92130
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16
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Rocha JF, Almeida L, Falcão A, Palma PN, Loureiro AI, Pinto R, Bonifácio MJ, Wright LC, Nunes T, Soares-da-Silva P. Opicapone: a short lived and very long acting novel catechol-O-methyltransferase inhibitor following multiple dose administration in healthy subjects. Br J Clin Pharmacol 2013; 76:763-75. [PMID: 23336248 PMCID: PMC3853535 DOI: 10.1111/bcp.12081] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2012] [Accepted: 12/22/2012] [Indexed: 11/28/2022] Open
Abstract
AIMS The aim of this study was to assess the tolerability, pharmacokinetics and inhibitory effect on erythrocyte soluble catechol-O-methyltransferase (S-COMT) activity following repeated doses of opicapone. METHODS This randomized, placebo-controlled, double-blind study enrolled healthy male subjects who received either once daily placebo or opicapone 5, 10, 20 or 30 mg for 8 days. RESULTS Opicapone was well tolerated. Its systemic exposure increased in an approximately dose-proportional manner with an apparent terminal half-life of 1.0 to 1.4 h. Sulphation was the main metabolic pathway. Opicapone metabolites recovered in urine accounted for less than 3% of the amount of opicapone administered suggesting that bile is likely the main route of excretion. Maximum S-COMT inhibition (Emax ) ranged from 69.9% to 98.0% following the last dose of opicapone. The opicapone-induced S-COMT inhibition showed a half-life in excess of 100 h, which was dose-independent and much longer than plasma drug exposure. Such a half-life translates into a putative underlying rate constant that is comparable with the estimated dissociation rate constant of the COMT-opicapone complex. CONCLUSION Despite its short elimination half-life, opicapone markedly and sustainably inhibited erythrocyte S-COMT activity making it suitable for a once daily regimen.
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Affiliation(s)
| | - Luis Almeida
- Health Sciences Department, University of AveiroAveiro, Portugal
| | - Amílcar Falcão
- Faculty of Pharmacy, University of CoimbraCoimbra, Portugal
| | - P Nuno Palma
- Department of Research & DevelopmentMamede do Coronado, Portugal
| | - Ana I Loureiro
- Department of Research & DevelopmentMamede do Coronado, Portugal
| | - Roberto Pinto
- Department of Research & DevelopmentMamede do Coronado, Portugal
- Department Pharmacology & Therapeutics, Faculty of Medicine, University PortoPorto, Portugal
| | | | - Lyndon C Wright
- Department of Research & DevelopmentMamede do Coronado, Portugal
| | - Teresa Nunes
- Department of Research & DevelopmentMamede do Coronado, Portugal
| | - Patrício Soares-da-Silva
- Department of Research & DevelopmentMamede do Coronado, Portugal
- Department Pharmacology & Therapeutics, Faculty of Medicine, University PortoPorto, Portugal
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17
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Parmentier-Batteur S, Hutson PH, Menzel K, Uslaner JM, Mattson BA, O'Brien JA, Magliaro BC, Forest T, Stump CA, Tynebor RM, Anthony NJ, Tucker TJ, Zhang XF, Gomez R, Huszar SL, Lambeng N, Fauré H, Le Poul E, Poli S, Rosahl TW, Rocher JP, Hargreaves R, Williams TM. Mechanism based neurotoxicity of mGlu5 positive allosteric modulators--development challenges for a promising novel antipsychotic target. Neuropharmacology 2013; 82:161-73. [PMID: 23291536 DOI: 10.1016/j.neuropharm.2012.12.003] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2012] [Revised: 12/06/2012] [Accepted: 12/11/2012] [Indexed: 11/17/2022]
Abstract
Previous work has suggested that activation of mGlu5 receptor augments NMDA receptor function and thereby may constitute a rational approach addressing glutamate hypofunction in schizophrenia and a target for novel antipsychotic drug development. Here, we report the in vitro activity, in vivo efficacy and safety profile of 5PAM523 (4-Fluorophenyl){(2R,5S)-5-[5-(5-fluoropyridin-2-yl)-1,2,4-oxadiazol-3-yl]-2-methylpiperidin-1-yl}methanone), a structurally novel positive allosteric modulator selective of mGlu5. In cells expressing human mGlu5 receptor, 5PAM523 potentiated threshold responses to glutamate in fluorometric calcium assays, but does not have any intrinsic agonist activity. 5PAM523 acts as an allosteric modulator as suggested by the binding studies showing that 5PAM523 did not displace the binding of the orthosteric ligand quisqualic acid, but did partially compete with the negative allosteric modulator, MPyEP. In vivo, 5PAM523 reversed amphetamine-induced locomotor activity in rats. Therefore, both the in vitro and in vivo data demonstrate that 5PAM523 acts as a selective mGlu5 PAM and exhibits anti-psychotic like activity. To study the potential for adverse effects and particularly neurotoxicity, brain histopathological exams were performed in rats treated for 4 days with 5PAM523 or vehicle. The brain exam revealed moderate to severe neuronal necrosis in the rats treated with the doses of 30 and 50 mg/kg, particularly in the auditory cortex and hippocampus. To investigate whether this neurotoxicity is mechanism specific to 5PAM523, similar safety studies were carried out with three other structurally distinct selective mGlu5 PAMs. Results revealed a comparable pattern of neuronal cell death. Finally, 5PAM523 was tested in mGlu5 knock-out (KO) and wild type (WT) mice. mGlu5 WT mice treated with 5PAM523 for 4 days at 100 mg/kg presented significant neuronal death in the auditory cortex and hippocampus. Conversely, mGlu5 KO mice did not show any neuronal loss by histopathology, suggesting that enhancement of mGlu5 function is responsible for the toxicity of 5PAM523. This study reveals for the first time that augmentation of mGlu5 function with selective allosteric modulators results in neurotoxicity.
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Affiliation(s)
| | - Peter H Hutson
- Merck Research Laboratories, 770 Sumneytown Pike, West Point, PA 19486-0004, USA
| | - Karsten Menzel
- Merck Research Laboratories, 770 Sumneytown Pike, West Point, PA 19486-0004, USA
| | - Jason M Uslaner
- Merck Research Laboratories, 770 Sumneytown Pike, West Point, PA 19486-0004, USA
| | - Britta A Mattson
- Merck Research Laboratories, 770 Sumneytown Pike, West Point, PA 19486-0004, USA
| | - Julie A O'Brien
- Merck Research Laboratories, 770 Sumneytown Pike, West Point, PA 19486-0004, USA
| | - Brian C Magliaro
- Merck Research Laboratories, 770 Sumneytown Pike, West Point, PA 19486-0004, USA
| | - Thomas Forest
- Merck Research Laboratories, 770 Sumneytown Pike, West Point, PA 19486-0004, USA
| | - Craig A Stump
- Merck Research Laboratories, 770 Sumneytown Pike, West Point, PA 19486-0004, USA
| | - Robert M Tynebor
- Merck Research Laboratories, 770 Sumneytown Pike, West Point, PA 19486-0004, USA
| | - Neville J Anthony
- Merck Research Laboratories, 770 Sumneytown Pike, West Point, PA 19486-0004, USA
| | - Thomas J Tucker
- Merck Research Laboratories, 770 Sumneytown Pike, West Point, PA 19486-0004, USA
| | - Xu-Fang Zhang
- Merck Research Laboratories, 770 Sumneytown Pike, West Point, PA 19486-0004, USA
| | - Robert Gomez
- Merck Research Laboratories, 770 Sumneytown Pike, West Point, PA 19486-0004, USA
| | - Sarah L Huszar
- Merck Research Laboratories, 770 Sumneytown Pike, West Point, PA 19486-0004, USA
| | - Nathalie Lambeng
- Addex Therapeutics, 12, chemin des Aulx, 1228 Plan-les-Ouates, Geneva, Switzerland
| | - H Fauré
- Addex Therapeutics, 12, chemin des Aulx, 1228 Plan-les-Ouates, Geneva, Switzerland
| | - Emannuel Le Poul
- Addex Therapeutics, 12, chemin des Aulx, 1228 Plan-les-Ouates, Geneva, Switzerland
| | - Sonia Poli
- Addex Therapeutics, 12, chemin des Aulx, 1228 Plan-les-Ouates, Geneva, Switzerland
| | - Thomas W Rosahl
- Merck Research Laboratories, 770 Sumneytown Pike, West Point, PA 19486-0004, USA
| | - Jean-Philippe Rocher
- Addex Therapeutics, 12, chemin des Aulx, 1228 Plan-les-Ouates, Geneva, Switzerland
| | - Richard Hargreaves
- Merck Research Laboratories, 770 Sumneytown Pike, West Point, PA 19486-0004, USA
| | - Theresa M Williams
- Merck Research Laboratories, 770 Sumneytown Pike, West Point, PA 19486-0004, USA
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18
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Allan GA, Gedge JI, Nedderman ANR, Roffey SJ, Small HF, Webster R. Pharmacokinetics and metabolism of UK-383,367 in rats and dogs: A rationale for long-lived plasma radioactivity. Xenobiotica 2008; 36:399-418. [PMID: 16854779 DOI: 10.1080/00498250600618177] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
UK-383,367 (5-{(1R)-4-cyclohexyl-1-[2-(hydroxyamino)-2-oxoethyl]butyl}-1,2,4-oxadiazole-3-carboxamide) is a novel procollagen C-proteinase inhibitor evaluated for the treatment of post-surgical dermal scarring. It is extensively metabolized in rat and dog absorption, distribution, metabolism and excretion studies, and a metabolic pathway for UK-383,367 was determined. A long-lived metabolite was identified in dog plasma. Data indicate that this metabolite results from the oxadiazole ring-cleavage-producing oxamic acid, oxamide and oxalic acid. Ion exclusion chromatography was used to identify these polar metabolites, which were unretained on a standard reversed-phase high-performance liquid chromatography system. The oxamide metabolite was identified as the long-lived radioactivity, which was observed in dog plasma.
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Affiliation(s)
- G A Allan
- Department of Pharmacokinetics, Dynamics and Metabolism, Pfizer Global Research and Development, Sandwich, UK.
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19
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McBriar MD, Clader JW, Chu I, Del Vecchio RA, Favreau L, Greenlee WJ, Hyde LA, Nomeir AA, Parker EM, Pissarnitski DA, Song L, Zhang L, Zhao Z. Discovery of amide and heteroaryl isosteres as carbamate replacements in a series of orally active gamma-secretase inhibitors. Bioorg Med Chem Lett 2007; 18:215-9. [PMID: 17988864 DOI: 10.1016/j.bmcl.2007.10.092] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2007] [Revised: 10/24/2007] [Accepted: 10/25/2007] [Indexed: 11/18/2022]
Abstract
The design of amide and heteroaryl amide isosteres as replacements for the carbamate substructure in previously disclosed 2,6-disubstituted piperidine N-arylsulfonamides is described. In several cases, amides lessened CYP liabilities in this class of gamma-secretase inhibitors. Selected compounds showed significant reduction of Abeta levels upon oral dosing in a transgenic murine model of Alzheimer's disease.
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Affiliation(s)
- Mark D McBriar
- Schering-Plough Research Institute, 2015 Galloping Hill Road, Kenilworth, NJ 07033, USA.
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20
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Hirawat S, Welch EM, Elfring GL, Northcutt VJ, Paushkin S, Hwang S, Leonard EM, Almstead NG, Ju W, Peltz SW, Miller LL. Safety, tolerability, and pharmacokinetics of PTC124, a nonaminoglycoside nonsense mutation suppressor, following single- and multiple-dose administration to healthy male and female adult volunteers. J Clin Pharmacol 2007; 47:430-44. [PMID: 17389552 DOI: 10.1177/0091270006297140] [Citation(s) in RCA: 192] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Nonsense (premature stop codon) mutations are causative in 5% to 15% of patients with monogenetic inherited disorders. PTC124, a 284-Dalton 1,2,4-oxadiazole, promotes ribosomal readthrough of premature stop codons in mRNA and offers therapeutic potential for multiple genetic diseases. The authors conducted 2 phase I studies of PTC124 in 62 healthy adult volunteers. The initial, single-dose study evaluated doses of 3 to 200 mg/kg and assessed fed-fasting status on pharmacokinetics following a dose of 50 mg/kg. The subsequent multiple-dose study evaluated doses from 10 to 50 mg/kg/dose twice per day (bid) for up to 14 days. PTC124 administered orally as a liquid suspension was palatable and well tolerated through single doses of 100 mg/kg. At 150 and 200 mg/kg, PTC124 induced mild headache, dizziness, and gastrointestinal events. With repeated doses through 50 mg/kg/dose bid, reversible transaminase elevations <2 times the upper limit of normal were sometimes observed. Immunoblot analyses of peripheral blood mononuclear cell extracts revealed no protein elongation due to nonspecific ribosomal readthrough of normal stop codons. PTC124 plasma concentrations exceeding the 2- to 10-microg/mL values associated with activity in preclinical genetic disease models were safely achieved. No sex-related differences in pharmacokinetics were seen. No drug accumulation with repeated dosing was apparent. Diurnal variation was observed, with greater PTC124 exposures after evening doses. PTC124 excretion in the urine was <2%. PTC124 pharmacokinetics were described by a 1-compartment model. Collectively, the data support initiation of phase II studies of PTC124 in patients with nonsense mutation-mediated cystic fibrosis and Duchenne muscular dystrophy.
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Affiliation(s)
- Samit Hirawat
- PTC Therapeutics, Inc, 100 Corporate Court, South Plainfield, NJ 07080, USA
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21
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Liu G, Lynch JK, Freeman J, Liu B, Xin Z, Zhao H, Serby MD, Kym PR, Suhar TS, Smith HT, Cao N, Yang R, Janis RS, Krauser JA, Cepa SP, Beno DWA, Sham HL, Collins CA, Surowy TK, Camp HS. Discovery of potent, selective, orally bioavailable stearoyl-CoA desaturase 1 inhibitors. J Med Chem 2007; 50:3086-100. [PMID: 17530838 DOI: 10.1021/jm070219p] [Citation(s) in RCA: 102] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Stearoyl-CoA desaturase 1 (SCD1) catalyzes the committed step in the biosynthesis of monounsaturated fatty acids from saturated, long-chain fatty acids. Studies with SCD1 knockout mice have established that these animals are lean and protected from leptin deficiency-induced and diet-induced obesity, with greater whole body insulin sensitivity than wild-type animals. In this work, we have discovered a series of potent, selective, orally bioavailable SCD1 inhibitors based on a known pyridazine carboxamide template. The representative lead inhibitor 28c also demonstrates excellent cellular activity in blocking the conversion of saturated long-chain fatty acid-CoAs (LCFA-CoAs) to monounsaturated LCFA-CoAs in HepG2 cells.
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Affiliation(s)
- Gang Liu
- Metabolic Disease Research, Drug Metabolism, Advanced Technology, Exploratory Pharmacokinetics, Global Pharmaceutical Research and Development, Abbott Laboratories, Abbott Park, Illinois 60064-6101, USA.
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22
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23
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Welch EM, Barton ER, Zhuo J, Tomizawa Y, Friesen WJ, Trifillis P, Paushkin S, Patel M, Trotta CR, Hwang S, Wilde RG, Karp G, Takasugi J, Chen G, Jones S, Ren H, Moon YC, Corson D, Turpoff AA, Campbell JA, Conn MM, Khan A, Almstead NG, Hedrick J, Mollin A, Risher N, Weetall M, Yeh S, Branstrom AA, Colacino JM, Babiak J, Ju WD, Hirawat S, Northcutt VJ, Miller LL, Spatrick P, He F, Kawana M, Feng H, Jacobson A, Peltz SW, Sweeney HL. PTC124 targets genetic disorders caused by nonsense mutations. Nature 2007; 447:87-91. [PMID: 17450125 DOI: 10.1038/nature05756] [Citation(s) in RCA: 826] [Impact Index Per Article: 48.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2006] [Accepted: 03/16/2007] [Indexed: 12/15/2022]
Abstract
Nonsense mutations promote premature translational termination and cause anywhere from 5-70% of the individual cases of most inherited diseases. Studies on nonsense-mediated cystic fibrosis have indicated that boosting specific protein synthesis from <1% to as little as 5% of normal levels may greatly reduce the severity or eliminate the principal manifestations of disease. To address the need for a drug capable of suppressing premature termination, we identified PTC124-a new chemical entity that selectively induces ribosomal readthrough of premature but not normal termination codons. PTC124 activity, optimized using nonsense-containing reporters, promoted dystrophin production in primary muscle cells from humans and mdx mice expressing dystrophin nonsense alleles, and rescued striated muscle function in mdx mice within 2-8 weeks of drug exposure. PTC124 was well tolerated in animals at plasma exposures substantially in excess of those required for nonsense suppression. The selectivity of PTC124 for premature termination codons, its well characterized activity profile, oral bioavailability and pharmacological properties indicate that this drug may have broad clinical potential for the treatment of a large group of genetic disorders with limited or no therapeutic options.
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Affiliation(s)
- Ellen M Welch
- PTC Therapeutics, 100 Corporate Court, South Plainfield, New Jersey 07080, USA
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24
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Romine JL, Martin SW, Meanwell NA, Gribkoff VK, Boissard CG, Dworetzky SI, Natale J, Moon S, Ortiz A, Yeleswaram S, Pajor L, Gao Q, Starrett JE. 3-[(5-Chloro-2-hydroxyphenyl)methyl]-5-[4-(trifluoromethyl)phenyl ]-1,3,4-oxadiazol-2(3H)-one, BMS-191011: opener of large-conductance Ca(2+)-activated potassium (maxi-K) channels, identification, solubility, and SAR. J Med Chem 2007; 50:528-42. [PMID: 17266205 DOI: 10.1021/jm061006n] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Compound 8a (BMS-191011), an opener of the cloned large-conductance, Ca2+-activated potassium (maxi-K) channel, demonstrated efficacy in in vivo stroke models, which led to its nomination as a candidate for clinical evaluation. Its maxi-K channel opening properties were consistent with its structural topology, being derived by combining elements from other known maxi-K openers. However, 8a suffered from poor aqueous solubility, which complicated elucidation of SAR during in vitro evaluation. The activity of 8a in in vivo stroke models and studies directed toward improving its solubility are reported herein. Enhanced solubility was achieved by appending heterocycles to the 8a scaffold, and a notable observation was made that inclusion of a simple amino group (anilines 8k and 8l) yielded excellent in vitro maxi-K ion channel opening activity and enhanced brain-to-plasma partitioning compared to the appended heterocycles.
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Affiliation(s)
- Jeffrey L Romine
- Bristol-Myers Squibb Pharmaceutical Research Institute, 5 Research Parkway, Wallingford, Connecticut 06492, USA.
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25
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Stavenger RA, Cui H, Dowdell SE, Franz RG, Gaitanopoulos DE, Goodman KB, Hilfiker MA, Ivy RL, Leber JD, Marino JP, Oh HJ, Viet AQ, Xu W, Ye G, Zhang D, Zhao Y, Jolivette LJ, Head MS, Semus SF, Elkins PA, Kirkpatrick RB, Dul E, Khandekar SS, Yi T, Jung DK, Wright LL, Smith GK, Behm DJ, Doe CP, Bentley R, Chen ZX, Hu E, Lee D. Discovery of Aminofurazan-azabenzimidazoles as Inhibitors of Rho-Kinase with High Kinase Selectivity and Antihypertensive Activity. J Med Chem 2006; 50:2-5. [PMID: 17201404 DOI: 10.1021/jm060873p] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The discovery, proposed binding mode, and optimization of a novel class of Rho-kinase inhibitors are presented. Appropriate substitution on the 6-position of the azabenzimidazole core provided subnanomolar enzyme potency in vitro while dramatically improving selectivity over a panel of other kinases. Pharmacokinetic data was obtained for the most potent and selective examples and one (6n) has been shown to lower blood pressure in a rat model of hypertension.
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Affiliation(s)
- Robert A Stavenger
- Department of Medicinal Chemistry, GlaxoSmithKline, King of Prussia, Pennsylvania 19406, USA.
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26
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Hamed SA. Drug evaluation: PTC-124--a potential treatment of cystic fibrosis and Duchenne muscular dystrophy. IDrugs 2006; 9:783-9. [PMID: 17096300] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
PTC-124, a 1,2,4-oxadiazole compound, is in development by PTC Therapeutics Inc as an orally active small molecule that can override nonsense stop translation signals to produce full-length proteins. PTC-124 is currently being evaluated in phase II clinical trials against cystic fibrosis (CF) and Duchenne muscular dystrophy (DMD). The functional properties of PTC-124 are similar to the aminoglycoside antibiotic gentamicin, but the two compounds are chemically distinct and PTC-124 does not exhibit any antibiotic characteristics. In vitro experiments showed PTC-124 to be superior to gentamicin at ribosomal read-through of nonsense mutations. In vivo investigations revealed that PTC-124 was effective in restoring the production of full-length protein in animal models of CF and DMD. Phase I clinical trials reported that PTC-124 was well tolerated in healthy patients. The author concludes that the encouraging results observed to date make PTC-124 an attractive option for further well-designed, long-term human studies on larger sample populations. The author also predicts that if results continue to be positive, PTC-124 could also be trialed in other single gene disorders with nonsense mutations such as hemophilia, neurofibromatosis, retinitis pigmentosa, bullous skin diseases and lysosomal storage disorders.
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Affiliation(s)
- Sherifa A Hamed
- Saudi German Hospital - Aseer, PO Box 2553, Khamis Mushayt 61961, Saudi Arabia.
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27
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Ma JD, Nafziger AN, Rhodes G, Liu S, Gartung AM, Bertino JS. The effect of oral pleconaril on hepatic cytochrome P450 3A activity in healthy adults using intravenous midazolam as a probe. J Clin Pharmacol 2006; 46:103-8. [PMID: 16397289 DOI: 10.1177/0091270005283286] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Pleconaril is a viral capsid inhibitor under evaluation for treatment of infections caused by rhinoviruses and enteroviruses. This study evaluated the effect of pleconaril on hepatic cytochrome P450 (CYP) 3A activity as assessed by intravenous (IV) midazolam. Healthy adults received oral pleconaril 400 mg 3 times daily for 16 doses. Single-dose, IV midazolam 0.025 mg/kg was administered before and during pleconaril administration. Midazolam and pleconaril plasma concentrations were assayed by LC/MS/MS. Bioequivalence was assessed by least squares geometric mean ratios (LS-GMR) with 90% confidence intervals (90% CIs) for the measured midazolam pharmacokinetic parameters. Sixteen subjects were enrolled, and 14 subjects completed the study. Pleconaril decreased midazolam AUC(0-infinity) 28% and increased systemic clearance 39%. LS-GMR (90% CI) were 0.718 (0.674-0.765) and 1.392 (1.307-1.483), respectively. Plasma pleconaril concentrations steadily increased over time. Observed changes in midazolam AUC(0-infinity) and systemic clearance suggest that oral pleconaril increased hepatic CYP3A activity in healthy adults.
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Affiliation(s)
- Joseph D Ma
- ORI Drug Development Center, Ordway Research Institute, Inc, 150 New Scotland Avenue, Albany, NY 12208, USA
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28
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Vieira E, Huwyler J, Jolidon S, Knoflach F, Mutel V, Wichmann J. 9H-Xanthene-9-carboxylic acid [1,2,4]oxadiazol-3-yl- and (2H-tetrazol-5-yl)-amides as potent, orally available mGlu1 receptor enhancers. Bioorg Med Chem Lett 2005; 15:4628-31. [PMID: 16099654 DOI: 10.1016/j.bmcl.2005.05.135] [Citation(s) in RCA: 74] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2005] [Revised: 05/20/2005] [Accepted: 05/20/2005] [Indexed: 11/21/2022]
Abstract
Small molecule mGluR1 enhancers based on the lead compound (9H-xanthene-9-carbonyl)-carbamic acid butyl ester derived from random-screening hit diphenylacetyl-carbamic acid ethyl ester were designed and synthesized as useful pharmacological tools for the study of the physiological roles mediated by mGlu1 receptors. The synthesis and the structure-activity relationship of this new class of positive allosteric modulators of mGlu1 receptors will be discussed in detail.
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Affiliation(s)
- Eric Vieira
- Pharma Division, Discovery Research, F. Hoffmann-La Roche Ltd., CH-4070 Basel, Switzerland.
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29
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Li Z, Chen W, Hale JJ, Lynch CL, Mills SG, Hajdu R, Keohane CA, Rosenbach MJ, Milligan JA, Shei GJ, Chrebet G, Parent SA, Bergstrom J, Card D, Forrest M, Quackenbush EJ, Wickham LA, Vargas H, Evans RM, Rosen H, Mandala S. Discovery of Potent 3,5-Diphenyl-1,2,4-oxadiazole Sphingosine-1-phosphate-1 (S1P1) Receptor Agonists with Exceptional Selectivity against S1P2 and S1P3. J Med Chem 2005; 48:6169-73. [PMID: 16190743 DOI: 10.1021/jm0503244] [Citation(s) in RCA: 84] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A class of 3,5-diphenyl-1,2,4-oxadiazole based compounds have been identified as potent sphingosine-1-phosphate-1 (S1P1) receptor agonists with minimal affinity for the S1P2 and S1P3 receptor subtypes. Analogue 26 (S1P1 IC50 = 0.6 nM) has an excellent pharmacokinetics profile in the rat and dog and is efficacious in a rat skin transplant model, indicating that S1P3 receptor agonism is not a component of immunosuppressive efficacy.
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Affiliation(s)
- Zhen Li
- Department of Medicinal Chemistry, Merck Research Laboratory, Rahway, New Jersey 07065, USA.
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30
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Venkatraman S, Lim J, Cramer M, Gardner MF, James J, Alves K, Lingham RB, Mumford RA, Munoz B. Influence of acid surrogates toward potency of VLA-4 antagonist. Bioorg Med Chem Lett 2005; 15:4053-6. [PMID: 16039122 DOI: 10.1016/j.bmcl.2005.06.034] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2005] [Revised: 06/02/2005] [Accepted: 06/06/2005] [Indexed: 11/15/2022]
Abstract
A series of VLA-4 antagonist were synthesized wherein carboxylic acid was replaced by various acid surrogates. The effect of these acid surrogates toward potency was evaluated in a binding assay. A number of acid surrogates were potent antagonist of VLA-4, albeit significantly less potent than the corresponding carboxylic acid. Heterocyclic acid surrogate, oxadiazolidinone 3, demonstrated an improved pharmacokinetic property when dosed intravenously.
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Affiliation(s)
- Shankar Venkatraman
- Department of Chemistry, Merck Research Laboratories, 3535 General Atomics Court, San Diego, CA 92121, USA.
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31
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Moharram S, Zhou A, Kumar P, Knaus EE, Wiebe LI. Radiosynthesis, in vitro cellular uptake and in vivo biodistribution of 3′-O-(3-benzenesulfonylfuroxan-4-yl)-5-[125I]iodo-2′-deoxyuridine, a nucleoside-based nitric oxide donor. Nucl Med Biol 2005; 32:641-5. [PMID: 16026711 DOI: 10.1016/j.nucmedbio.2005.04.011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2004] [Revised: 03/22/2005] [Accepted: 04/16/2005] [Indexed: 11/29/2022]
Abstract
INTRODUCTION 3'-O-(3-Benzenesulfonylfuroxan-4-yl)-5-iodo-2'-deoxyuridine (1) is a cytotoxic nitric oxide (NO) donor-nucleoside dual action prodrug designed to exploit both NO and an antimetabolite nucleoside for cancer therapy. METHODS 1 was radiolabeled by radioiodide exchange and purified by HPLC in 16% overall radiochemical yield. The specific activity of [(125)I]1 was 31.8 microCi/mug (680 MBq/microM). Protein binding, deiodination, cellular uptake and incorporation of 1 into cellular nucleic acids were measured by standard methods, and its in vivo biodistribution was determined in Balb/c mice bearing implanted EMT-6 tumors following intravenous injection. RESULTS [(125)I]1 degraded rapidly during the in vitro tests, thus impeding unequivocal assessment but indicating that it was only weakly protein bound and that it was resistant to deiodination under test conditions. Uptake of [(125)I]1 by murine tumor cells (KBALB and KBALB-STK) in vitro was low (approximately 17 fmol/microg protein over 2 h) with only approximately 0.3% (0.04-0.06 fmol/microg protein) of total uptake present in the DNA fraction. In the murine tumor model, liver, kidney, intestine and tumor showed the greatest uptake, with liver, intestine and blood all containing >5 injected dose per gram of tissue (%ID/g) during the 15-min to 2-h postinjection period. Maximum tissue/blood level ratios were 3.6 (2 h) for tumor and 6.4 (24 h) for liver. Low uptake in thyroid and stomach was indicative of minimal in vivo deiodination. CONCLUSIONS [(125)I]1 undergoes only minimal deoiodination under both in vitro and in vivo conditions. Under conditions of the in vitro NO release assay, 1 reacts to produce a single, major, unstable adduct that decomposes upon workup. Protein binding of [(125)I]1 could not be assessed because of similar chemical reaction with albumin. Incorporation of radioactivity into the cellular nucleic acid fraction was low, and in vivo distribution of [(125)I]1 was consistent with nonspecific reactivity towards tissue nucleophiles. The chemical reactivity of [(125)I]1 mitigates against its use as a NO donor and as a tracer for this class of compounds.
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Affiliation(s)
- Sameh Moharram
- Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, Alberta, Canada T6G 2N8
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Bachmann K, Telang U, Byers J, Hoss W. The processing of the selective M1 agonist CDD-0102-J by human hepatic drug metabolizing enzymes. Am J Ther 2005; 12:300-5. [PMID: 16041192 DOI: 10.1097/01.pgp.0000145356.05787.19] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
The in vitro metabolism of the selective M1 muscarinic agonist CDD-0102-J was evaluated in heterologous systems expressing individual human cytochrome P-450 (CYP) isoenzymes and also in suspensions of cryopreserved human hepatocytes. In all experiments, the metabolism of CDD-0102-J was characterized based on its rate of disappearance using an HPLC assay since no metabolites have as yet been characterized. The human CYP isoenzymes used were CYP1A2, 2A6, 2B6, 2C8, 2C19, 2D6, and 3A4. Measurable decreases in CDD-0102-J concentrations over time were detectable only in systems containing either CYP2D6 or CYP2C8, although the unbound in vitro clearance was more than 20 times larger for CYP2D6 (7.6 mL h(-1) nmol(-1)) than for CYP2C8 (0.35 mL h(-1) nmol(-1)). When scaled to in vivo hepatic clearance based on just CYP2D6 and CYP2C8, the projected hepatic clearance for CDD-0102-J was 7.7 L h(-1), which corresponded closely with the hepatic clearance of 8.4 L h(-1) scaled from experiments using cryopreserved human hepatocytes.
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Affiliation(s)
- Kenneth Bachmann
- Department of Pharmacology, The University of Toledo, Toledo, Ohio 43606, USA.
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Elzein E, Ibrahim P, Koltun DO, Rehder K, Shenk KD, Marquart TA, Jiang B, Li X, Natero R, Li Y, Nguyen M, Kerwar S, Chu N, Soohoo D, Hao J, Maydanik VY, Lustig DA, Zeng D, Leung K, Zablocki JA. CVT-4325: a potent fatty acid oxidation inhibitor with favorable oral bioavailability. Bioorg Med Chem Lett 2005; 14:6017-21. [PMID: 15546720 DOI: 10.1016/j.bmcl.2004.09.077] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2004] [Revised: 09/26/2004] [Accepted: 09/28/2004] [Indexed: 10/26/2022]
Abstract
New inhibitors of palmitoyl-CoA oxidation are based on the introduction of nitrogen heterocycles in the 'Western Portion' of the molecule. SAR studies led to the discovery of CVT-4325 (shown), a potent FOXi (IC50=380 nM rat mitochondria) with favorable PK properties (F=93%, t(1/2)=13.6h, dog).
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Affiliation(s)
- Elfatih Elzein
- Department of Bioorganic Chemistry, CV Therapeutics, Inc., 3172 Porter Dr., Palo Alto, CA 94304, USA
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Mise M, Yadera S, Matsuda M, Hashizume T, Matsumoto S, Terauchi Y, Fujii T. POLYMORPHIC EXPRESSION OF CYP1A2 LEADING TO INTERINDIVIDUAL VARIABILITY IN METABOLISM OF A NOVEL BENZODIAZEPINE RECEPTOR PARTIAL INVERSE AGONIST IN DOGS. Drug Metab Dispos 2004; 32:240-5. [PMID: 14744947 DOI: 10.1124/dmd.32.2.240] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
5-(3-methoxyphenyl)-3-(5-methyl-1,2,4-oxadiazol-3-yl)-2-oxo-1,2-dihydro-1,6-naphthyridine (AC-3933) is a novel cognitive enhancer with central benzodiazepine receptor partial inverse agonistic activity. AC-3933 is predominantly metabolized to hydroxylated metabolite [SX-5745; 3-(5-hydroxymethyl-1,2,4-oxadiazol-3-yl)-5-(3-methoxyphenyl)-2-oxo-1,2-dihydro-1,6-naphthyridine] in dog. Initially, we found that there is considerable interindividual variability in AC-3933 hydroxylation in dogs and that dogs could be phenotyped as extensive metabolizer (EM) and poor metabolizer (PM). Then, to clarify the cause of AC-3933 polymorphic hydroxylation in dogs, in vitro studies were carried out using liver microsomes from EM and PM dogs. Our results show that AC-3933 hydroxylation clearance in PM dogs was much lower than that in EM dogs (0.2 versus 10.8-20.5 microl/min/mg, respectively). In addition, AC-3933 hydroxylation was significantly inhibited by alpha-naphthoflavone, a CYP1A inhibitor, and by anti-CYP1A2 antibodies, indicating that CYP1A2 was responsible for the polymorphic hydroxylation of AC-3933 in dogs. Furthermore, immunoblotting results have shown that although CYP1A2 protein was not detected in PM dogs (<0.86 pmol/mg), CYP1A2 content in EM dogs was prominent (6.1-13.0 pmol/mg). These results indicate that AC-3933 polymorphic hydroxylation arises from the polymorphic expression of CYP1A2 in dogs, which might involve genetic polymorphism of the CYP1A2 gene.
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Affiliation(s)
- Masashi Mise
- Pharmacokinetics and Physico-Chemical Property Research Laboratories, Dainippon Pharmaceutical Co, Ltd, Osaka 564-0053, Japan.
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Toulmond S, Tang K, Bureau Y, Ashdown H, Degen S, O'Donnell R, Tam J, Han Y, Colucci J, Giroux A, Zhu Y, Boucher M, Pikounis B, Xanthoudakis S, Roy S, Rigby M, Zamboni R, Robertson GS, Ng GYK, Nicholson DW, Flückiger JP. Neuroprotective effects of M826, a reversible caspase-3 inhibitor, in the rat malonate model of Huntington's disease. Br J Pharmacol 2004; 141:689-97. [PMID: 14744804 PMCID: PMC1574244 DOI: 10.1038/sj.bjp.0705662] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
1. Caspases, key enzymes in the apoptosis pathway, have been detected in the brain of HD patients and in animal models of the disease. In the present study, we investigated the neuroprotective properties of a new, reversible, caspase-3-specific inhibitor, M826 (3-([(2S)-2-[5-tert-butyl-3-[[(4-methyl-1,2,5-oxadiazol-3-yl)methyl]amino]-2-oxopyrazin-1(2H)-yl]butanoyl]amino)-5-[hexyl(methyl)amino]-4-oxopentanoic acid), in a rat malonate model of HD. 2. Pharmacokinetic and autoradiography studies after intrastriatal (i.str.) injection of 1.5 nmol of M826 or its tritiated analogue [(3)H]M826 indicated that the compound diffused within the entire striatum. The elimination half-life (T(1/2)) of M826 in the rat striatum was 3 h. 3. I.str. injection of 1.5 nmol of M826 10 min after malonate infusion induced a significant reduction (66%) in the number of neurones expressing active caspase-3 in the ipsilateral striatum. 4. Inhibition of active caspase-3 translated into a significant but moderate reduction (39%) of the lesion volume, and of cell death (24%), 24 h after injury. The efficacy of M826 at inhibiting cell death was comparable to that of the noncompetitive NMDA receptor antagonist MK801. 5. These data provide in vivo proof-of-concept of the neuroprotective effects of reversible caspase-3 inhibitors in a model of malonate-induced striatal injury in the adult rat.
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Affiliation(s)
- Sylvie Toulmond
- Department of Pharmacology, Merck Frosst Centre for Therapeutic Research, 16711 Trans Canada Highway, Kirkland, Quebec, H9H 3L1, Canada.
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Hirota Y, Suzuki M, Yamaguchi K, Fujita T, Katsube N. Effects of the Neutrophil Elastase Inhibitor (ONO-6818) on Acetic Acid Induced Colitis in Syrian Hamsters. J Vet Med Sci 2004; 66:1223-8. [PMID: 15528853 DOI: 10.1292/jvms.66.1223] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Neutrophil elastase (NE) released from neutrophils during inflammation is related to tissue disturbance and organ failure. We investigated the effects of an orally active NE inhibitor, ONO-6818, on acetic acid induced colitis in Syrian hamsters. The ulcer area, hemoglobin level in the colonic lumen, NE activity, and tissue myeloperoxidase (MPO) activity in the colitis control animals were significantly increased compared to the normal control ones. Either oral or subcutaneous treatment with ONO-6818 had significant inhibitory effects on the ulcer area, hemoglobin level and NE activity in the colonic lumen, but ONO-6818 did not have a significant inhibitory effect on tissue MPO activity. We conclude that NE is closely related to the development of inflammation in acetic acid-induced colitis in Syrian hamsters and that the condition is improved by the inhibition of NE.
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Affiliation(s)
- Yasushi Hirota
- Fukui Safety Research Laboratories, Ono Pharmaceutical Co., Ltd., Fukui, Japan
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Sánchez-López A, Centurión D, Vázquez E, Arulmani U, Saxena PR, Villalón CM. Pharmacological profile of the 5-HT-induced inhibition of cardioaccelerator sympathetic outflow in pithed rats: correlation with 5-HT1 and putative 5-ht5A/5B receptors. Br J Pharmacol 2003; 140:725-35. [PMID: 14504136 PMCID: PMC1574076 DOI: 10.1038/sj.bjp.0705489] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Continuous infusions of 5-hydroxytryptamine (5-HT) inhibit the tachycardiac responses to preganglionic (C7-T1) sympathetic stimulation in pithed rats pretreated with desipramine. The present study identified the pharmacological profile of this inhibitory action of 5-HT. The inhibition induced by intravenous (i.v.) continuous infusions of 5-HT (5.6 microg x kg-1x min-1) on sympathetically induced tachycardiac responses remained unaltered after i.v. treatment with saline or the antagonists GR 127935 (5-HT1B/1D), the combination of WAY 100635 (5-HT1A) plus GR 127935, ritanserin (5-HT2), tropisetron (5-HT3/4), LY215840 (5-HT7) or a cocktail of antagonists/inhibitors consisting of yohimbine (alpha2), prazosin (alpha1), ritanserin, GR 127935, WAY 100635 and indomethacin (cyclooxygenase), but was abolished by methiothepin (5-HT1/2/6/7 and recombinant 5-ht5A/5B). These drugs, used in doses high enough to block their respective receptors/mechanisms, did not modify the sympathetically induced tachycardiac responses per se. I.v. continuous infusions of the agonists 5-carboxamidotryptamine (5-CT; 5-HT1/7 and recombinant 5-ht5A/5B), CP 93129 (r5-HT1B), sumatriptan (5-HT1B/1D), PNU-142633 (5-HT1D) and ergotamine (5-HT1B/1D and recombinant 5-ht5A/5B) mimicked the above sympatho-inhibition to 5-HT. In contrast, the agonists indorenate (5-HT1A) and LY344864 (5-ht1F) were inactive. Interestingly, 5-CT-induced cardiac sympatho-inhibition was abolished by methiothepin, the cocktail of antagonists/inhibitors, GR 127935 or the combination of SB224289 (5-HT1B) plus BRL15572 (5-HT1D), but remained unchanged when SB224289 or BRL15572 were given separately. Therefore, 5-HT-induced cardiac sympatho-inhibition, being unrelated to 5-HT2, 5-HT3, 5-HT4, 5-ht6, 5-HT7 receptors, alpha1/2-adrenoceptor or prostaglandin synthesis, seems to be primarily mediated by (i). 5-HT1 (probably 5-HT1B/1D) receptors and (ii). a novel mechanism antagonized by methiothepin that, most likely, involves putative 5-ht5A/5B receptors.
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MESH Headings
- Animals
- Autonomic Fibers, Preganglionic/drug effects
- Autonomic Fibers, Preganglionic/physiology
- Blood Pressure/drug effects
- Decerebrate State/physiopathology
- Desipramine/administration & dosage
- Desipramine/pharmacokinetics
- Disease Models, Animal
- Drug Therapy, Combination
- Electric Stimulation/methods
- Ergotamine/administration & dosage
- Ergotamine/pharmacokinetics
- Infusions, Intravenous
- Injections, Intravenous
- Male
- Oxadiazoles/administration & dosage
- Oxadiazoles/pharmacokinetics
- Piperazines/administration & dosage
- Piperazines/pharmacokinetics
- Pyridines/administration & dosage
- Pyridines/pharmacokinetics
- Rats
- Rats, Wistar
- Receptors, Serotonin/classification
- Receptors, Serotonin/drug effects
- Receptors, Serotonin/physiology
- Receptors, Serotonin, 5-HT1/classification
- Receptors, Serotonin, 5-HT1/drug effects
- Receptors, Serotonin, 5-HT1/physiology
- Serotonin/administration & dosage
- Serotonin/analogs & derivatives
- Serotonin/pharmacokinetics
- Serotonin Antagonists/administration & dosage
- Serotonin Antagonists/pharmacokinetics
- Serotonin Receptor Agonists/administration & dosage
- Serotonin Receptor Agonists/pharmacokinetics
- Sympathetic Nervous System/drug effects
- Sympathetic Nervous System/physiopathology
- Tachycardia/drug therapy
- Tachycardia/physiopathology
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Affiliation(s)
- Araceli Sánchez-López
- Departamento de Farmacobiología, CINVESTAV-IPN, Czda. de los Tenorios 235, Col. Granjas-Coapa, Deleg. Tlalpan, C.P. 14330, México D.F., México
| | - David Centurión
- Departamento de Farmacobiología, CINVESTAV-IPN, Czda. de los Tenorios 235, Col. Granjas-Coapa, Deleg. Tlalpan, C.P. 14330, México D.F., México
| | - Erika Vázquez
- Departamento de Farmacobiología, CINVESTAV-IPN, Czda. de los Tenorios 235, Col. Granjas-Coapa, Deleg. Tlalpan, C.P. 14330, México D.F., México
| | - Udayasankar Arulmani
- Department of Pharmacology, Cardiovascular Research Institute ‘COEUR', Erasmus MC, University Medical Center Rotterdam, PO Box 1738, Rotterdam 3000 DR, The Netherlands
| | - Pramod R Saxena
- Department of Pharmacology, Cardiovascular Research Institute ‘COEUR', Erasmus MC, University Medical Center Rotterdam, PO Box 1738, Rotterdam 3000 DR, The Netherlands
| | - Carlos M Villalón
- Departamento de Farmacobiología, CINVESTAV-IPN, Czda. de los Tenorios 235, Col. Granjas-Coapa, Deleg. Tlalpan, C.P. 14330, México D.F., México
- Author for correspondence:
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Abstract
The heterodimeric heme-protein soluble guanylyl cyclase (sGC) is the only proven receptor for nitric oxide (NO). Recently, two different types of NO-independent soluble guanylyl cyclase stimulators have been discovered. The heme-dependent stimulator 2-[1-[2-fluorophenyl)methyl]-1H-pyrazolo[3,4-b]pyridin-3-yl]-5(4-morpholinyl)-4,6-pyrimidinediamine (BAY 41-8543) stimulates the enzyme in a synergistic fashion when combined with NO, requires the presence of the heme group and can be blocked by the soluble guanylyl cyclase inhibitor 1H-(1,2,4)-Oxadiazole-(4,3-a)-quinoxalin-1-one (ODQ). The heme-independent activator 4-[((4-carboxybutyl)[2-[(4-phenethylbenzol) oxy]phenethyl]amino)methyl[benzoic]acid (BAY 58-2667) activates soluble guanylyl cyclase even in the presence of ODQ or rendered heme-deficient. In the present study, BAY 41-8543, BAY 58-2667 and NO strongly increased V(max). Combination of BAY 58-2667 and NO increased V(max) in an additive manner, whereas the synergistic effect of BAY 41-8543 and NO on enzyme activation was reflected in an overadditive increase of V(max). ODQ potentiated V(max) of BAY 58-2667-stimulated soluble guanylyl cyclase. BAY 41-8543 prolonged the half-life of the nitrosyl-heme complex of NO-activated enzyme, an effect that was not observed with BAY 58-2667. These results show the different activation patterns of both compounds and demonstrate their value as tools to investigate the mechanisms that underlie soluble guanylyl cyclase activation.
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Affiliation(s)
- Peter Schmidt
- Institute of Cardiovascular Research, Bayer AG, Aprather Weg 18a, D-42096, Wuppertal, Germany
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Abzug MJ, Cloud G, Bradley J, Sánchez PJ, Romero J, Powell D, Lepow M, Mani C, Capparelli EV, Blount S, Lakeman F, Whitley RJ, Kimberlin DW. Double blind placebo-controlled trial of pleconaril in infants with enterovirus meningitis. Pediatr Infect Dis J 2003; 22:335-41. [PMID: 12690273 DOI: 10.1097/01.inf.0000059765.92623.70] [Citation(s) in RCA: 85] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND Enterovirus (EV) meningitis is common in infants and may have neurologic complications. Treatment of older children and adults with pleconaril has been associated with reduced severity and duration of symptoms. This study evaluated the pharmacokinetics, safety and efficacy of pleconaril in infants with EV meningitis. METHODS Infants < or =12 months old with suspected EV meningitis were randomized 2:1 to receive pleconaril, 5 mg/kg/dose orally three times a day or placebo for 7 days. Evaluations included pharmacokinetic determinations, safety laboratory testing, serial culture and PCR assays and clinical evaluations. RESULTS Of 21 evaluable subjects 20 were confirmed with EV infection (12 pleconaril, 8 placebo). Among pleconaril-treated subjects 26 of 29 peak and trough pleconaril levels exceeded the 90% inhibitory concentration for EVs. A median 3.5-fold drug accumulation occurred between Days 2 and 7. Pleconaril was well-tolerated, although twice as many adverse events occurred per subject in the pleconaril group. Serial cultures from the oropharynx, rectum and serum had low yield (< or =50%) and positivity generally persisted for <4 days in both groups. Serial PCR assays of culture-negative oropharyngeal and rectal specimens had high positivity rates (generally > or =50%) persisting through Day 14. No significant differences in duration of positivity by culture or PCR, hospitalization or symptoms were detected between groups. CONCLUSIONS The dose of pleconaril studied provided sufficient plasma levels and was well-tolerated; however, drug accumulation was evident. The low yields of serial viral cultures, relatively short and benign clinical courses and the small number of subjects enrolled precluded demonstration of efficacy. If this medication is to be prescribed in infants, surveillance for toxicity related to drug accumulation will be necessary.
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Affiliation(s)
- Mark J Abzug
- Pediatric Infectious Disease, Department of Pediatrics, University of Colorado School of Medicine and The Children's Hospital, 1056 E. Nineteenth Avenue, Denver, CO 80218, USA.
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Abstract
Despite the availability of therapy for selected symptoms, no specific antiviral agents are available to treat or prevent infections due to the viruses of the Picornaviridae family--rhinoviruses and enteroviruses. Characterization of the three-dimensional structure of picornaviruses in the 1980s allowed development of compounds targeted at the virus itself. Pleconaril is a novel, orally available, systemically acting molecule whose pharmacokinetics are characterized by a two-compartment open model with first-order absorption and with a safety profile similar to that of placebo. It shows promising results in treatment of picornaviral respiratory tract infections, meningitis, and other life-threatening infections.
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Affiliation(s)
- Naomi R Florea
- Department of Pharmacy Research, Hartford Hospital, Hartford, Connecticut 06102, USA
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González G, Celedón G, Sandoval M, González GE, Ferrer V, Astete R, Behn C. Hypobaric hypoxia-reoxygenation diminishes band 3 protein functions in human erythrocytes. Pflugers Arch 2002; 445:337-41. [PMID: 12466935 DOI: 10.1007/s00424-002-0967-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2002] [Accepted: 09/26/2002] [Indexed: 10/27/2022]
Abstract
We have previously shown that subjects exposed to acute hypobaric hypoxia display an erythrocyte membrane protein band 3 with an increased susceptibility to proteolytic degradation. We suggested it was due to an oxidative damage of band 3. We now report that exposure to hypobaric hypoxia followed by reoxygenation affects protein band 3 functions such as anion transport and binding of glyceraldehyde-3P-dehydrogenase. Transport capacity was assessed with the fluorescent probe 2-[N-(7-nitrobenz-2-oxa-1,3-diazol-4-yl)amino] ethanesulfonate (NBD-taurine). Binding capacity was evaluated from the activity of the membrane-associated enzyme. Healthy young men were exposed for 20 min to hypobaric hypoxia, simulating an altitude of 4,500 m above sea level and after recompression band 3 function was assessed. An inhibition of band 3 anion transport function and a decrease in the binding of glyceraldehyde-3P-dehydrogenase to band 3 were observed. Evidence is given supporting the hypothesis that functional alteration of band 3 is due to its oxidative modification originated as a consequence of the exposure to hypobaric hypoxia and further reoxygenation.
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Affiliation(s)
- Gustavo González
- Instituto de Química, Facultad de Ciencias Básicas y Matemáticas, Universidad Católica de Valparaíso, Valparaíso, Chile.
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Kearns GL, Bradley JS, Jacobs RF, Capparelli EV, James LP, Johnson KM, Abdel-Rahman SM. Single dose pharmacokinetics of pleconaril in neonates. Pediatric Pharmacology Research Unit Network. Pediatr Infect Dis J 2000; 19:833-9. [PMID: 11001105 DOI: 10.1097/00006454-200009000-00005] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND Pleconaril is an orally active, broad spectrum antipicornaviral agent with activity against nonpolio enteroviruses. Pleconaril phamacokinetics was evaluated in 16 neonates (16.4 +/- 8.7 days postnatal age) with suspected enteroviral infection. METHODS Pleconaril (5 or 7.5 mg/kg) was administered orally to study subjects and plasma pleconaril concentrations quantified from serial blood samples obtained during 24 h after a single oral dose by gas chromatography with electrochemical detection. Pharmacokinetic parameter estimates were determined by noncompartmental methods and compared between doses and with similar data obtained from a previous study of pleconaril disposition in children (n = 18, 2 to 12 years). RESULTS Pleconaril was well-tolerated in all neonates without discernible adverse events. Comparison between the 5.0- and 7.5-mg/kg doses revealed no significant differences in peak plasma concentration (Cmax 686.7 vs. 617.1 ng/ml), elimination half-life (t 1/2; 4.6 vs. 6.6 h), area under the plasma concentration vs. time curve (AUC; 5162.6 vs. 5523.9 ng/ml/h), apparent steady state volume of distribution (V(dss)/F; 9.3 vs. 17.1 liters/ kg) and apparent oral clearance (Cl/F; 1.3 vs. 1.7 liters/h/kg). In addition, no correlation was observed between postconceptional age and AUC, V(dss)/F, t 1/2 or Cl/F for pleconaril. Comparison of pleconaril pharmacokinetics between neonates and children suggested a significant difference in V(dss)/F (9.3 vs. 4.7 liters/kg), dose-normalized Cmax, (686.7 vs. 1272.5 ng(ml) and AUC (5125.6 vs. 8131.2 ng/ml/h). In contrast, the mean elimination t 1/2 between neonates and children was not appreciably different. CONCLUSIONS The apparent age-dependent differences in the pharmacokinetics of pleconaril may in part be related to increased bioavailability of the drug in older children and adults than in neonates. Our data appear to support the use of a 5.0-mg/kg dose given every 8 to 12 h in future studies of pleconaril in neonatal patients with enteroviral infection.
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Affiliation(s)
- G L Kearns
- Department of Pediatrics, University of Missouri-Kansas City, MO, USA.
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Feng DD, Biftu T, Candelore MR, Cascieri MA, Colwell LF, Deng L, Feeney WP, Forrest MJ, Hom GJ, MacIntyre DE, Miller RR, Stearns RA, Strader CD, Tota L, Wyvratt MJ, Fisher MH, Weber AE. Discovery of an orally bioavailable alkyl oxadiazole beta3 adrenergic receptor agonist. Bioorg Med Chem Lett 2000; 10:1427-9. [PMID: 10888324 DOI: 10.1016/s0960-894x(00)00267-5] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
5-n-Pentyl oxadiazole substituted benzenesulfonamide 8 is a potent and selective beta3 adrenergic receptor agonist (beta3 EC50 = 23 nM, beta1 IC50 = 3000 nM, beta2 IC50 = 3000 nM). The compound has high oral bioavailability in dogs (62%) and rats (36%) and is among the most orally bioavailable beta3 adrenergic receptor agonists reported to date.
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Affiliation(s)
- D D Feng
- Department of Medicinal Chemistry, Merck Research Laboratories, Rahway NJ 07065, USA.
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44
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Abstract
PURPOSE To develop an integrated absorption model for estimating the fraction of dose absorbed and determining the causes of poor oral drug absorption. METHODS Both analytical and numerical methods were used to estimate the fraction of dose absorbed. RESULTS An integrated absorption model was developed by considering transit flow, dissolution, and permeation processes, simultaneously. A framework was proposed to determine permeability-, dissolution-, and solubility-limited absorption. Digoxin, griseofulvin, and panadiplon were employed to illustrate the applications of the integrated model in identifying the causes of poor absorption and guiding formulation development. CONCLUSIONS The integrated absorption model was successfully applied to digoxin, griseofulvin, and panadiplon to estimate the fraction dose absorbed and to roughly determine the causes of poor oral drug absorption.
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Affiliation(s)
- L X Yu
- Glaxo Wellcome, Inc., Research Triangle Park, North Carolina 27709, USA.
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45
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Sparrow CP, Patel S, Baffic J, Chao YS, Hernandez M, Lam MH, Montenegro J, Wright SD, Detmers PA. A fluorescent cholesterol analog traces cholesterol absorption in hamsters and is esterified in vivo and in vitro. J Lipid Res 1999; 40:1747-57. [PMID: 10508194] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/14/2023] Open
Abstract
The fluorescent cholesterol analog 22-(N-(7-nitrobenz-2-oxa-1, 3-diazol-4-yl)amino)-23,24-bisnor-5-cholen-3beta-ol (fluoresterol) was characterized as a tool for exploring the biochemistry and cell biology of intestinal cholesterol absorption. Hamsters absorbed fluoresterol in a concentration- and time-dependent manner, with an efficiency of about 15-30% that of cholesterol. Fluoresterol absorption was blocked by compounds known to inhibit cholesterol absorption, implying that fluoresterol interacts with those elements of the normal pathway for cholesterol absorption on which the inhibitors act. Confocal microscopy of small intestinal tissue demonstrated that fluoresterol was taken up by absorptive epithelial cells and packaged into lipoprotein particles, suggesting a normal route of intracellular trafficking. Uptake of fluoresterol was confirmed by biochemical analysis of intestinal tissue, and a comparison of [(3)H] cholesterol and fluoresterol content in the mucosa suggested that fluoresterol moved through the enterocytes more rapidly than did cholesterol. This interpretation was supported by measurements of fluoresterol esterification in the mucosa. Four hours after hamsters were given fluoresterol and [(3)H]cholesterol orally, 44% of the fluoresterol in the intestinal mucosa was esterified, compared to 8% of the [(3)H]cholesterol. Caco-2 cells took up 2- to 5-fold more [(3)H]cholesterol than fluoresterol from bile acid micelles, and esterified 21-24% of the fluoresterol but only 1-4% of the [(3)H]cholesterol. Thus fluoresterol apparently interacts with the proteins required for cholesterol uptake, trafficking, and processing in the small intestine.
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Affiliation(s)
- C P Sparrow
- Department of Lipid Biochemistry, Merck Research Laboratories, Building 80W, 126 E. Lincoln Avenue, Rahway, NJ 07065, USA
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46
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Pevear DC, Tull TM, Seipel ME, Groarke JM. Activity of pleconaril against enteroviruses. Antimicrob Agents Chemother 1999; 43:2109-15. [PMID: 10471549 PMCID: PMC89431 DOI: 10.1128/aac.43.9.2109] [Citation(s) in RCA: 250] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/1999] [Accepted: 06/14/1999] [Indexed: 11/20/2022] Open
Abstract
The activity of pleconaril in cell culture against prototypic enterovirus strains and 215 clinical isolates of the most commonly isolated enterovirus serotypes was examined. The latter viruses were isolated by the Centers for Disease Control and Prevention during the 1970s and 1980s from clinically ill subjects. Pleconaril at a concentration of =0.03 microM inhibited the replication of 50% of all clinical isolates tested. Ninety percent of the isolates were inhibited at a drug concentration of =0.18 microM. The most sensitive serotype, echovirus serotype 11, was also the most prevalent enterovirus in the United States from 1970 to 1983. Pleconaril was further tested for oral activity in three animal models of lethal enterovirus infection: coxsackievirus serotype A9 infection in suckling mice, coxsackievirus serotype A21 strain Kenny infection in weanling mice, and coxsackievirus serotype B3 strain M infection in adult mice. Treatment with pleconaril increased the survival rate in all three models for both prophylactic and therapeutic dosing regimens. Moreover, pleconaril dramatically reduced virus levels in target tissues of coxsackievirus serotype B3 strain M-infected animals. Pleconaril represents a promising new drug candidate for potential use in the treatment of human enteroviral infections.
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Affiliation(s)
- D C Pevear
- ViroPharma Incorporated, Exton, Pennsylvania 19341, USA.
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47
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Windhorst AD, Timmerman H, Klok RP, Custers FG, Menge WM, Leurs R, Stark H, Schunack W, Gielen EG, van Kroonenburgh MJ, Herscheid JD. Radiosynthesis and biodistribution of 123I-labeled antagonists of the histamine H3 receptor as potential SPECT ligands. Nucl Med Biol 1999; 26:651-9. [PMID: 10587103 DOI: 10.1016/s0969-8051(99)00014-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
We have synthesized three 123I-labeled histamine H3 receptor ligands, i.e., [123I]GR 190028, [123I]FUB 271, and [123I]iodoproxyfan, in moderate to good radiochemical yields via a Cu+-assisted I-for-123I exchange method. Biodistribution in the rat of these compounds revealed high hepatic and pulmonary uptake. Brain uptake was moderate, but for [123I]iodoproxyfan, brain uptake was high enough for a pilot single photon emission computed tomography (SPECT) study in the rabbit. However, for this compound, the cerebral uptake could not be blocked by a pretreatment with [R]-alpha-methylhistamine, a selective, high-affinity histamine H3 receptor agonist, both in the SPECT study in the rabbit and in the biodistribution study in the rat. Apparently, [123I]iodoproxyfan is binding to a non-H3 receptor binding site. None of the three investigated compounds is suitable for use as a SPECT ligand for the H3 receptor in the brain.
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Affiliation(s)
- A D Windhorst
- Radionuclide Center, Vrije Universiteit, Amsterdam, The Netherlands.
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48
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Wieczorek M, Gyorkos A, Spruce LW, Ettinger A, Ross SE, Kroona HS, Burgos-Lepley CE, Bratton LD, Drennan TS, Garnert DL, Von Burg G, Pilkington CG, Cheronis JC. Biochemical characterization of alpha-ketooxadiazole inhibitors of elastases. Arch Biochem Biophys 1999; 367:193-201. [PMID: 10395735 DOI: 10.1006/abbi.1999.1249] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A series of alpha-ketooxadiazole compounds was prepared and evaluated in vitro as potential inhibitors of human neutrophil elastase (HNE), proteinase-3 (PR-3), and porcine pancreatic elastase (PPE). Several compounds have been found to be very potent, fast, reversible, and selective inhibitors of HNE with Ki values below 100 pM. The highest kon value exceeded 10(7) M(-1) s(-1). Some alpha-ketooxadiazoles were also very effective against PR-3 and PPE with Ki values in the range of 5(-10) nM and 0.1(-2) nM, respectively. The two rings, 1,2,4- and 1,3,4-oxadiazole, are amenable to substitutions, extending the P' side of the inhibitor and allowing additional binding interactions at S' subsites of the enzyme. Nonpeptidic HNE inhibitors containing the oxadiazole heterocycle displayed promising oral bioavailability.
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Affiliation(s)
- M Wieczorek
- Cortech, Inc., 6850 North Broadway, Denver, Colorado, 80221, USA.
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49
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Abstract
Pleconaril is an orally active broad-spectrum antipicornaviral agent with excellent penetration into the central nervous system and nasal epithelium. The authors report the results of a randomized, placebo-controlled, dose escalation study of pleconaril oral capsules following single-dose administration of 50 to 1000 mg. Fifty-six healthy adults (ages 19-55) participated in the study. Each subject received a single dose of pleconaril oral capsule(s) or an identically matched placebo. Blood samples (n = 19) were obtained over 36 hours postdose, and pleconaril was quantified from plasma by gas chromatography. Pleconaril disposition was best characterized using a two-compartment open-model with first-order absorption. Fifty-five subjects completed the study (31 +/- 10 years, 77.6 +/- 11 kg). The administration of pleconaril was well tolerated. There was no difference in tmax, lambda z, ka, t1/2elim, Cl/F, or Vdss/F among the various dose groups. A significant difference in both Cmax and AUC was observed between study groups; however, this difference became insignificant when the parameters were corrected for dose. Cmax and AUC were dose proportional between 50 and 1000 mg (r2 > 0.97 and 0.90, respectively). Pleconaril demonstrates a favorable safety and pharmacokinetic profile following single-dose administration.
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Affiliation(s)
- S M Abdel-Rahman
- Section of Pediatric Clinical Pharmacology and Experimental Therapeutics, Children's Mercy Hospital, Kansas City, Missouri 64108, USA
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50
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Kearns GL, Abdel-Rahman SM, James LP, Blowey DL, Marshall JD, Wells TG, Jacobs RF. Single-dose pharmacokinetics of a pleconaril (VP63843) oral solution in children and adolescents. Pediatric Pharmacology Research Unit Network. Antimicrob Agents Chemother 1999; 43:634-8. [PMID: 10049279 PMCID: PMC89172 DOI: 10.1128/aac.43.3.634] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Pleconaril is an orally active, broad-spectrum antipicornaviral agent which demonstrates excellent penetration into the central nervous system, liver, and nasal epithelium. In view of the potential pediatric use of pleconaril, we conducted a single-dose, open-label study to characterize the pharmacokinetics of this antiviral agent in pediatric patients. Following an 8- to 10-h period of fasting, 18 children ranging in age from 2 to 12 years (7.5 +/- 3.1 years) received a single 5-mg/kg of body weight oral dose of pleconaril solution administered with a breakfast of age-appropriate composition. Repeated blood samples (n = 10) were obtained over 24 h postdose, and pleconaril was quantified from plasma by gas chromatography. Plasma drug concentration-time data for each subject were fitted to the curve by using a nonlinear, weighted (weight = 1/Ycalc) least-squares algorithm, and model-dependent pharmacokinetic parameters were determined from the polyexponential parameter estimates. Pleconaril was well tolerated by all subjects. A one-compartment open-model with first-order absorption best described the plasma pleconaril concentration-time profile in 13 of the subjects over a 24-h postdose period. Pleconaril pharmacokinetic parameters (means +/- standard deviations) for these 13 patients were as follows. The maximum concentration of the drug in serum (Cmax) was 1,272.5 +/- 622.1 ng/ml. The time to Cmax was 4.1 +/- 1.5 h, and the lag time was 0.75 +/- 0.56 h. The apparent absorption rate constant was 0.75 +/- 0.48 1/h, and the elimination rate constant was 0.16 +/- 0.07 1/h. The area under the concentration-time curve from 0 to 24 h was 8,131.15 +/- 3,411.82 ng.h/ml. The apparent total plasma clearance was 0.81 +/- 0.86 liters/h/kg, and the apparent steady-state volume of distribution was 4.68 +/- 2.02 liters/kg. The mean elimination half-life of pleconaril was 5.7 h. The mean plasma pleconaril concentrations at both 12 h (250.4 +/- 148.2 ng/ml) and 24 h (137.9 +/- 92.2 ng/ml) after the single 5-mg/kg oral dose in children were higher than that from in vitro studies reported to inhibit > 90% of nonpolio enterovirus serotypes (i.e., 70 ng/ml). Thus, our data support the evaluation of a 5-mg/kg twice-daily oral dose of pleconaril for therapeutic trials in pediatric patients with enteroviral infections.
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Affiliation(s)
- G L Kearns
- Section of Pediatric Clinical Pharmacology and Experimental Therapeutics, Children's Mercy Hospital, Kansas City, Missouri, USA.
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