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Jeanblanc J, Sauton P, Houdant C, Fernandez Rodriguez S, de Sousa SV, Jeanblanc V, Bodeau S, Labat L, Soichot M, Vorspan F, Naassila M. Sex-related differences in the efficacy of Baclofen enantiomers on self-administered alcohol in a binge drinking pattern and dopamine release in the core of the nucleus accumbens. Front Pharmacol 2023; 14:1146848. [PMID: 37007041 PMCID: PMC10060511 DOI: 10.3389/fphar.2023.1146848] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2023] [Accepted: 03/07/2023] [Indexed: 03/18/2023] Open
Abstract
Introduction: Clinical studies on the effectiveness of Baclofen in alcohol use disorder (AUD) yielded mixed results possibly because of differential effects of the enantiomers and sex-related differences. Here we examined the effect of the different Baclofen enantiomers on alcohol intake and on evoked dopamine release in the core of the nucleus accumbens (NAcc) in male and female Long Evans rats.Methods: Rats were trained to chronically self-administer 20% alcohol solution in daily binge drinking sessions and were treated with the different forms of Baclofen [RS(±), R(+) and S(−)]. The effects on the evoked dopamine release within the core of the nucleus accumbens were measured in brain slices from the same animals and the alcohol naïve animals using the fast scan cyclic voltammetry technique.Results: RS(±)-Baclofen reduced alcohol intake regardless of sex but more females were non-responders to the treatment. R(+)-Baclofen also reduced alcohol intake regardless of sex but females were less sensitive than males. S(−)-Baclofen did not have any effect on average but in some individuals, especially in the females, it did increase alcohol intake by at least 100%. There were no sex differences in Baclofen pharmacokinetic but a strong negative correlation was found in females with a paradoxical effect of increased alcohol intake with higher blood Baclofen concentration. Chronic alcohol intake reduced the sensitivity to the effect of Baclofen on evoked dopamine release and S(−)-Baclofen increased dopamine release specifically in females.Discussion: Our results demonstrate a sex-dependent effect of the different forms of Baclofen with no or negative effects (meaning an increase in alcohol self-administration) in subgroup of females that could be linked to a differential effect on dopamine release and should warrant future clinical studies on alcohol use disorder pharmacotherapy that will deeply analyze sex difference.
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Affiliation(s)
- Jérôme Jeanblanc
- INSERM UMR-S 1247, Research Group on Alcohol and Pharmacodependences (GRAP), Université de Picardie Jules Verne, Amiens, France
- GDR3557 Psychiatrie-Addictions, Institut de Psychiatrie, University Hospital Federation (FHU A2M2P), Caen, France
| | - Pierre Sauton
- INSERM UMR-S 1247, Research Group on Alcohol and Pharmacodependences (GRAP), Université de Picardie Jules Verne, Amiens, France
- GDR3557 Psychiatrie-Addictions, Institut de Psychiatrie, University Hospital Federation (FHU A2M2P), Caen, France
| | - Charles Houdant
- INSERM UMR-S 1247, Research Group on Alcohol and Pharmacodependences (GRAP), Université de Picardie Jules Verne, Amiens, France
- GDR3557 Psychiatrie-Addictions, Institut de Psychiatrie, University Hospital Federation (FHU A2M2P), Caen, France
| | - Sandra Fernandez Rodriguez
- INSERM UMR-S 1247, Research Group on Alcohol and Pharmacodependences (GRAP), Université de Picardie Jules Verne, Amiens, France
| | - Sofia Vilelas de Sousa
- INSERM UMR-S 1247, Research Group on Alcohol and Pharmacodependences (GRAP), Université de Picardie Jules Verne, Amiens, France
| | - Virginie Jeanblanc
- Animal Facility of the Université de Picardie Jules Verne, Amiens, France
| | - Sandra Bodeau
- MP3CV Laboratory, Department of Clinical Pharmacology, Amiens University Hospital, University of Picardie Jules Verne, Amiens, France
| | - Laurence Labat
- INSERM UMR-S 1144, Optimisation Thérapeutique en Neuropsychopharmacologie, Université de Paris, Paris, France
- Faculté de Médecine, Université de Paris Cité, Paris, France
- Département de Psychiatrie et de Médecine Addictologique, Hôpital Fernand Widal, Assistance Publique—Hôpitaux de Paris, Paris, France
| | - Marion Soichot
- Laboratoire de Toxicologie Biologique, Hôpital Lariboisière, Paris, France
| | - Florence Vorspan
- INSERM UMRS1144, Département de Psychiatrie et de Médecine Addictologique, Assistance Publique—Hôpitaux de Paris, GH Lariboisière—Fernand Widal, GHU NORD, Université de Paris, Paris, France
| | - Mickael Naassila
- INSERM UMR-S 1247, Research Group on Alcohol and Pharmacodependences (GRAP), Université de Picardie Jules Verne, Amiens, France
- GDR3557 Psychiatrie-Addictions, Institut de Psychiatrie, University Hospital Federation (FHU A2M2P), Caen, France
- *Correspondence: Mickael Naassila,
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McLaughlin MJ, Fisher MT. A critical evaluation of oral baclofen in pediatric patients with cerebral palsy. J Pediatr Rehabil Med 2023; 16:3-9. [PMID: 36872802 PMCID: PMC10116143 DOI: 10.3233/prm-230003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 03/06/2023] Open
Affiliation(s)
- Matthew J McLaughlin
- Children's Mercy -Kansas City, University of Missouri-Kansas City School of Medicine, Kansas City, MO, USA
| | - Mark T Fisher
- Children's Mercy -Kansas City, University of Missouri-Kansas City School of Medicine, Kansas City, MO, USA
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Naffaa MM, Hibbs DE, Chebib M, Hanrahan JR. Roles of hydrophilic residues in GABA binding site of GABA-ρ1 receptor explain the addition/inhibition effects of competitive ligands. Neurochem Int 2021; 153:105258. [PMID: 34933011 DOI: 10.1016/j.neuint.2021.105258] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2021] [Revised: 11/02/2021] [Accepted: 12/15/2021] [Indexed: 01/14/2023]
Abstract
The orthosteric binding site of GABA-gated ion channels has been widely explored. Many residues in the binding site of GABA were studied. The interactions due to the binding of GABA into the binding site drive channel activation and determine the potency and efficacy of GABA response. The combined effect of a competitive ligand and GABA on GABA-ρ1 receptors has been poorly studied. Here, we used point mutations, molecular modeling, and electrophysiological studies to explore the role of two hydrophilic residues (Serine 168 and Serine 243) of the GABA-ρ1 receptors in response to the binding of GABA and other studied ligands. Our results suggested that Ser168 residue stabilizes either closed state or open conformation depending on the other determinant interactions of each state. On the other hand, Ser243 residue is predicted to form different inter-subunit interactions with residues in the adjacent subunit at different states of the channel. Our current findings enlighten us to reasonably explain the additive/inhibitive effects of applying a competitive ligand with GABA simultaneously. Understanding the mixed effect of potentiation and inhibition would facilitate the discovery of new drugs to work as a direct GABA's activity modulators with more selectivity at various subunits forming GABA-gated ion channels.
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Affiliation(s)
- Moawiah M Naffaa
- Faculty of Medicine and Health, School of Pharmacy, The University of Sydney, Australia
| | - David E Hibbs
- Faculty of Medicine and Health, School of Pharmacy, The University of Sydney, Australia
| | - Mary Chebib
- Faculty of Medicine and Health, School of Pharmacy, The University of Sydney, Australia
| | - Jane R Hanrahan
- Faculty of Medicine and Health, School of Pharmacy, The University of Sydney, Australia.
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GABA B Receptor Chemistry and Pharmacology: Agonists, Antagonists, and Allosteric Modulators. Curr Top Behav Neurosci 2021; 52:81-118. [PMID: 34036555 DOI: 10.1007/7854_2021_232] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
The GABAB receptors are metabotropic G protein-coupled receptors (GPCRs) that mediate the actions of the primary inhibitory neurotransmitter, γ-aminobutyric acid (GABA). In the CNS, GABA plays an important role in behavior, learning and memory, cognition, and stress. GABA is also located throughout the gastrointestinal (GI) tract and is involved in the autonomic control of the intestine and esophageal reflex. Consequently, dysregulated GABAB receptor signaling is associated with neurological, mental health, and gastrointestinal disorders; hence, these receptors have been identified as key therapeutic targets and are the focus of multiple drug discovery efforts for indications such as muscle spasticity disorders, schizophrenia, pain, addiction, and gastroesophageal reflex disease (GERD). Numerous agonists, antagonists, and allosteric modulators of the GABAB receptor have been described; however, Lioresal® (Baclofen; β-(4-chlorophenyl)-γ-aminobutyric acid) is the only FDA-approved drug that selectively targets GABAB receptors in clinical use; undesirable side effects, such as sedation, muscle weakness, fatigue, cognitive deficits, seizures, tolerance and potential for abuse, limit their therapeutic use. Here, we review GABAB receptor chemistry and pharmacology, presenting orthosteric agonists, antagonists, and positive and negative allosteric modulators, and highlight the therapeutic potential of targeting GABAB receptor modulation for the treatment of various CNS and peripheral disorders.
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Shaye H, Stauch B, Gati C, Cherezov V. Molecular mechanisms of metabotropic GABA B receptor function. SCIENCE ADVANCES 2021; 7:7/22/eabg3362. [PMID: 34049877 PMCID: PMC8163086 DOI: 10.1126/sciadv.abg3362] [Citation(s) in RCA: 42] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2020] [Accepted: 04/14/2021] [Indexed: 05/06/2023]
Abstract
Metabotropic γ-aminobutyric acid G protein-coupled receptors (GABAB) represent one of the two main types of inhibitory neurotransmitter receptors in the brain. These receptors act both pre- and postsynaptically by modulating the transmission of neuronal signals and are involved in a range of neurological diseases, from alcohol addiction to epilepsy. A series of recent cryo-EM studies revealed critical details of the activation mechanism of GABAB Structures are now available for the receptor bound to ligands with different modes of action, including antagonists, agonists, and positive allosteric modulators, and captured in different conformational states from the inactive apo to the fully active state bound to a G protein. These discoveries provide comprehensive insights into the activation of the GABAB receptor, which not only broaden our understanding of its structure, pharmacology, and physiological effects but also will ultimately facilitate the discovery of new therapeutic drugs and neuromodulators.
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Affiliation(s)
- Hamidreza Shaye
- Department of Chemistry, University of Southern California, Los Angeles, CA, USA
- Bridge Institute, Michelson Center for Convergent Biosciences, University of Southern California, Los Angeles, CA, USA
| | - Benjamin Stauch
- Department of Chemistry, University of Southern California, Los Angeles, CA, USA
- Bridge Institute, Michelson Center for Convergent Biosciences, University of Southern California, Los Angeles, CA, USA
| | - Cornelius Gati
- Bridge Institute, Michelson Center for Convergent Biosciences, University of Southern California, Los Angeles, CA, USA
- Biosciences Division, SLAC National Accelerator Laboratory, Menlo Park, CA, USA
- Department of Biological Sciences, University of Southern California, Los Angeles, CA, USA
| | - Vadim Cherezov
- Department of Chemistry, University of Southern California, Los Angeles, CA, USA.
- Bridge Institute, Michelson Center for Convergent Biosciences, University of Southern California, Los Angeles, CA, USA
- Department of Biological Sciences, University of Southern California, Los Angeles, CA, USA
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Grayson JD, Cresswell AJ. γ-Amino phosphonates via the photocatalytic α-C–H alkylation of primary amines. Tetrahedron 2021. [DOI: 10.1016/j.tet.2020.131896] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Enzymatic kinetic resolution of desmethylphosphinothricin indicates that phosphinic group is a bioisostere of carboxyl group. Commun Chem 2020; 3:121. [PMID: 36703359 PMCID: PMC9814759 DOI: 10.1038/s42004-020-00368-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2020] [Accepted: 08/04/2020] [Indexed: 01/29/2023] Open
Abstract
Escherichia coli glutamate decarboxylase (EcGadB), a pyridoxal 5'-phosphate (PLP)-dependent enzyme, is highly specific for L-glutamate and was demonstrated to be effectively immobilised for the production of γ-aminobutyric acid (GABA), its decarboxylation product. Herein we show that EcGadB quantitatively decarboxylates the L-isomer of D,L-2-amino-4-(hydroxyphosphinyl)butyric acid (D,L-Glu-γ-PH), a phosphinic analogue of glutamate containing C-P-H bonds. This yields 3-aminopropylphosphinic acid (GABA-PH), a known GABAB receptor agonist and provides previously unknown D-Glu-γ-PH, allowing us to demonstrate that L-Glu-γ-PH, but not D-Glu-γ-PH, is responsible for D,L-Glu-γ-PH antibacterial activity. Furthermore, using GABase, a preparation of GABA-transaminase and succinic semialdehyde dehydrogenase, we show that GABA-PH is converted to 3-(hydroxyphosphinyl)propionic acid (Succinate-PH). Hence, PLP-dependent and NADP+-dependent enzymes are herein shown to recognise and metabolise phosphinic compounds, leaving unaffected the P-H bond. We therefore suggest that the phosphinic group is a bioisostere of the carboxyl group and the metabolic transformations of phosphinic compounds may offer a ground for prodrug design.
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8
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Evenseth LSM, Gabrielsen M, Sylte I. The GABA B Receptor-Structure, Ligand Binding and Drug Development. Molecules 2020; 25:molecules25133093. [PMID: 32646032 PMCID: PMC7411975 DOI: 10.3390/molecules25133093] [Citation(s) in RCA: 51] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2020] [Revised: 07/02/2020] [Accepted: 07/06/2020] [Indexed: 11/17/2022] Open
Abstract
The γ-aminobutyric acid (GABA) type B receptor (GABAB-R) belongs to class C of the G-protein coupled receptors (GPCRs). Together with the GABAA receptor, the receptor mediates the neurotransmission of GABA, the main inhibitory neurotransmitter in the central nervous system (CNS). In recent decades, the receptor has been extensively studied with the intention being to understand pathophysiological roles, structural mechanisms and develop drugs. The dysfunction of the receptor is linked to a broad variety of disorders, including anxiety, depression, alcohol addiction, memory and cancer. Despite extensive efforts, few compounds are known to target the receptor, and only the agonist baclofen is approved for clinical use. The receptor is a mandatory heterodimer of the GABAB1 and GABAB2 subunits, and each subunit is composed of an extracellular Venus Flytrap domain (VFT) and a transmembrane domain of seven α-helices (7TM domain). In this review, we briefly present the existing knowledge about the receptor structure, activation and compounds targeting the receptor, emphasizing the role of the receptor in previous and future drug design and discovery efforts.
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Affiliation(s)
- Linn Samira Mari Evenseth
- Molecular Pharmacology and Toxicology, Department of Medical Biology, Faculty of Health Sciences, UiT The Arctic University of Norway, NO-9037 Tromsø, Norway
| | - Mari Gabrielsen
- Molecular Pharmacology and Toxicology, Department of Medical Biology, Faculty of Health Sciences, UiT The Arctic University of Norway, NO-9037 Tromsø, Norway
| | - Ingebrigt Sylte
- Molecular Pharmacology and Toxicology, Department of Medical Biology, Faculty of Health Sciences, UiT The Arctic University of Norway, NO-9037 Tromsø, Norway
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Abstract
Baclofen, β-(4-chlorophenyl)-γ-aminobutyric acid, holds a unique position in neuroscience, remaining the only U.S. Food and Drug Administration (FDA) approved GABAB agonist. While intended to be a more brain penetrant, i.e, ability to cross the blood-brain barrier (BBB), version of GABA (γ-aminobutyric acid) for the potential treatment of epilepsy, baclofen's highly efficacious muscle relaxant properties led to its approval, as a racemate, for the treatment of spasticity. Interestingly, baclofen received FDA approval before its receptor, GABAB, was discovered and its exact mechanism of action was known. In recent times, baclofen has a myriad of off-label uses, with the treatment for alcohol abuse and drug addiction garnering a great deal of attention. This Review aims to capture the >60 year legacy of baclofen by walking through the history, pharmacology, synthesis, drug metabolism, routes of administration, and societal impact of this Classic in chemical neuroscience.
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Affiliation(s)
- Caitlin N. Kent
- Warren Center for Neuroscience Drug Discovery, Vanderbilt University School of Medicine, Nashville, Tennessee 37232, United States
- Department of Chemistry, Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, Tennessee 37232, United States
| | - Charlotte Park
- Warren Center for Neuroscience Drug Discovery, Vanderbilt University School of Medicine, Nashville, Tennessee 37232, United States
| | - Craig W. Lindsley
- Warren Center for Neuroscience Drug Discovery, Vanderbilt University School of Medicine, Nashville, Tennessee 37232, United States
- Department of Pharmacology, Vanderbilt University School of Medicine, Nashville, Tennessee 37232, United States
- Department of Chemistry, Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, Tennessee 37232, United States
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, Tennessee 37232, United States
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Gusarova NK, Trofimov BA. Organophosphorus chemistry based on elemental phosphorus: advances and horizons. RUSSIAN CHEMICAL REVIEWS 2020. [DOI: 10.1070/rcr4903] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The results of studies on the application of elemental phosphorus for the synthesis of important organophosphorus compounds are surveyed and summarized. Currently, this trend represents a synthetically, environmentally and technologically attractive alternative to classical organophosphorus chemistry based on toxic and corrosive phosphorus chlorides. Direct phosphination and phosphinylation of organic compounds with elemental phosphorus (discussed in the first part of the review) basically extend the range of available phosphines, phosphine chalcogenides and phosphinic acids and provides further development of their synthetic potential (discussed in the second part of the review). It is shown that the breakthrough in this area is largely due to the discovery of reactions of elemental phosphorus (white and red) with various electrophiles in superbasic suspensions and emulsions derived from alkali metal hydroxides and to the development of electrochemical, electrocatalytic and catalytic activation of white phosphorus.
The bibliography includes 299 references.
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He Q, Chhonker YS, McLaughlin MJ, Murry DJ. Simultaneous Quantitation of S(+)- and R(-)-Baclofen and Its Metabolite in Human Plasma and Cerebrospinal Fluid using LC-APCI-MS/MS: An Application for Clinical Studies. Molecules 2020; 25:molecules25020250. [PMID: 31936209 PMCID: PMC7024189 DOI: 10.3390/molecules25020250] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Revised: 12/30/2019] [Accepted: 01/03/2020] [Indexed: 12/11/2022] Open
Abstract
Baclofen is a racemic mixture that is commonly used for the treatment for spasticity. However, the optimal dose and dosing interval to achieve effective cerebral spinal fluid (CSF) concentrations of baclofen are not known. Moreover, it is unclear if there are differences in the ability of R- or S-baclofen to cross the blood–brain barrier and achieve effective CSF concentrations. We have validated a liquid chromatography coupled with tandem mass spectrometry (LC-MS/MS) method with improved selectivity and sensitivity for the simultaneous quantitation of R- and S-baclofen and metabolites in plasma and CSF. Protein precipitation by acetonitrile was utilized to obtain an acceptable recovery of the analytes. The detection and separation of analytes was achieved on a 48 °C-heated Crownpak CR(+) column (150 mm × 4.0 mm, 5μ) with elution using 0.4% formic acid (FA) in water and 0.4% FA in acetonitrile as the mobile phase running at a flow rate of 1.0 mL/min. Accurate quantitation was assured by using this MS/MS method with atmospheric pressure chemical ionization in multiple reaction monitoring (MRM) mode. Therefore, this method is enantioselective, accurate, precise, sensitive, reliable, and linear from 1 to 1500 ng/mL for baclofen and 2 to 4000 ng/mL for the metabolites. An additional method was developed to separate racemic baclofen 3-(4-chlorophenyl)-4 hydroxybutyric acid metabolites for individual concentration determination. Both validated methods were successfully applied to a clinical pharmacokinetic human plasma and CSF study evaluating the disposition of baclofen and metabolites.
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Affiliation(s)
- Qingfeng He
- Clinical Pharmacology Laboratory, Department of Pharmacy Practice and Science, University of Nebraska Medical Center, Omaha, NE 68198, USA; (Q.H.); (Y.S.C.)
| | - Yashpal S. Chhonker
- Clinical Pharmacology Laboratory, Department of Pharmacy Practice and Science, University of Nebraska Medical Center, Omaha, NE 68198, USA; (Q.H.); (Y.S.C.)
| | - Matthew J. McLaughlin
- Division of Rehabilitation Medicine, Children’s Mercy Kansas City, UMKC School of Medicine, Kansas City, MO 64108, USA;
| | - Daryl J. Murry
- Clinical Pharmacology Laboratory, Department of Pharmacy Practice and Science, University of Nebraska Medical Center, Omaha, NE 68198, USA; (Q.H.); (Y.S.C.)
- Fred and Pamela Buffett Cancer Center, University of Nebraska Medical Center, Omaha, NE 68198, USA
- Correspondence: ; Tel.: +1-402-559-3790 or +1-402-559-2430
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12
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Martínez-Campos Z, Pastor N, Pineda-Urbina K, Gómez-Sandoval Z, Fernández-Zertuche M, Razo-Hernández RS. In silico structure-based design of GABA B receptor agonists using a combination of docking and QSAR. Chem Biol Drug Des 2019; 94:1782-1798. [PMID: 31207116 DOI: 10.1111/cbdd.13580] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2019] [Revised: 05/29/2019] [Accepted: 06/02/2019] [Indexed: 12/27/2022]
Abstract
The study of γ-aminobutyric acid B receptor (GABAB ) activation is of great interest for several brain disorders. The search of new GABAB receptor agonists has been carried out by many research groups. As a result, Baclofen has become the prototypical GABAB receptor agonist. However, several attempts have been made to modify its structure to generate derivatives with improved activity. In this work, we carried out a theoretical and computational study for a wide range of GABAB receptor agonists reported in the literature. Molecular docking and QSAR techniques were combined by using the interaction energies of the agonists with the key residues of GABAB receptor, as molecular descriptors for the QSAR construction. The resulting mathematical model suggests that the activity of GABAB receptor agonists is influenced by three factors: their shape and molecular size (PW5 and PJI2), their constitutional features (ELUMO and T(N…O)) and the energy interaction with GABAB receptor (ETRP278 ). This model was validated by the QUIK, REDUNDANCY and OVERFITTING rules, and its predicted ability was tasted by the QLOO , QASYM , R 0 2 and r m 2 rules. Finally, six new compounds are proposed (35-40) with high potential to be used as GABAB receptor agonists.
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Affiliation(s)
- Zuleyma Martínez-Campos
- Instituto de Investigación en Ciencias Básicas y Aplicadas, Centro de Investigaciones Químicas, Universidad Autónoma del Estado de Morelos, Cuernavaca, Morelos, México
| | - Nina Pastor
- Instituto de Investigación en Ciencias Básicas y Aplicadas, Centro de Investigación en Dinámica Celular, Universidad Autónoma del Estado de Morelos, Cuernavaca, Morelos, México
| | | | | | - Mario Fernández-Zertuche
- Instituto de Investigación en Ciencias Básicas y Aplicadas, Centro de Investigaciones Químicas, Universidad Autónoma del Estado de Morelos, Cuernavaca, Morelos, México
| | - Rodrigo Said Razo-Hernández
- Instituto de Investigación en Ciencias Básicas y Aplicadas, Centro de Investigación en Dinámica Celular, Universidad Autónoma del Estado de Morelos, Cuernavaca, Morelos, México
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13
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Single-stage synthesis of alkyl-H-phosphinic acids from elemental phosphorus and alkyl bromides. MENDELEEV COMMUNICATIONS 2019. [DOI: 10.1016/j.mencom.2019.05.030] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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14
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Evenseth LM, Warszycki D, Bojarski AJ, Gabrielsen M, Sylte I. In Silico Methods for the Discovery of Orthosteric GABA B Receptor Compounds. Molecules 2019; 24:E935. [PMID: 30866507 PMCID: PMC6429233 DOI: 10.3390/molecules24050935] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Revised: 02/20/2019] [Accepted: 03/01/2019] [Indexed: 12/27/2022] Open
Abstract
The GABAB receptor (GABAB-R) is a heterodimeric class C G protein-coupled receptor comprised of the GABAB1a/b and GABAB2 subunits. The endogenous orthosteric agonist γ-amino-butyric acid (GABA) binds within the extracellular Venus flytrap (VFT) domain of the GABAB1a/b subunit. The receptor is associated with numerous neurological and neuropsychiatric disorders including learning and memory deficits, depression and anxiety, addiction and epilepsy, and is an interesting target for new drug development. Ligand- and structure-based virtual screening (VS) are used to identify hits in preclinical drug discovery. In the present study, we have evaluated classical ligand-based in silico methods, fingerprinting and pharmacophore mapping and structure-based in silico methods, structure-based pharmacophores, docking and scoring, and linear interaction approximation (LIA) for their aptitude to identify orthosteric GABAB-R compounds. Our results show that the limited number of active compounds and their high structural similarity complicate the use of ligand-based methods. However, by combining ligand-based methods with different structure-based methods active compounds were identified in front of DUDE-E decoys and the number of false positives was reduced, indicating that novel orthosteric GABAB-R compounds may be identified by a combination of ligand-based and structure-based in silico methods.
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Affiliation(s)
- Linn M Evenseth
- Molecular Pharmacology and Toxicology, Department of Medical Biology, Faculty of Health Sciences, UiT-The Arctic University of Norway, NO-9037 Tromsø, Norway.
| | - Dawid Warszycki
- Department of Medicinal Chemistry, Institute of Pharmacology, Polish Academy of Science, Smetna 12, 31-343 Kraków, Poland.
| | - Andrzej J Bojarski
- Department of Medicinal Chemistry, Institute of Pharmacology, Polish Academy of Science, Smetna 12, 31-343 Kraków, Poland.
| | - Mari Gabrielsen
- Molecular Pharmacology and Toxicology, Department of Medical Biology, Faculty of Health Sciences, UiT-The Arctic University of Norway, NO-9037 Tromsø, Norway.
| | - Ingebrigt Sylte
- Molecular Pharmacology and Toxicology, Department of Medical Biology, Faculty of Health Sciences, UiT-The Arctic University of Norway, NO-9037 Tromsø, Norway.
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15
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Wang H, Li W, Zeng K, Wu Y, Zhang Y, Xu T, Chen Y. Photocatalysis Enables Visible‐Light Uncaging of Bioactive Molecules in Live Cells. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201811261] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Haoyan Wang
- State Key Laboratory of Bioorganic and Natural Products ChemistryCentre of Excellence in Molecular SynthesisShanghai Institute of Organic ChemistryUniversity of Chinese Academy of SciencesChinese Academy of Sciences 345 Lingling Road Shanghai 200032 China
| | - Wei‐Guang Li
- Centre for Brain Science and Department of Anatomy and PhysiologyShanghai Jiao Tong University School of Medicine 280 South Chongqing Road Shanghai 200025 China
| | - Kaixing Zeng
- State Key Laboratory of Bioorganic and Natural Products ChemistryCentre of Excellence in Molecular SynthesisShanghai Institute of Organic ChemistryUniversity of Chinese Academy of SciencesChinese Academy of Sciences 345 Lingling Road Shanghai 200032 China
- School of Physical Science and TechnologyShanghaiTech University 100 Haike Road Shanghai 201210 China
| | - Yan‐Jiao Wu
- Centre for Brain Science and Department of Anatomy and PhysiologyShanghai Jiao Tong University School of Medicine 280 South Chongqing Road Shanghai 200025 China
| | - Yixin Zhang
- State Key Laboratory of Bioorganic and Natural Products ChemistryCentre of Excellence in Molecular SynthesisShanghai Institute of Organic ChemistryUniversity of Chinese Academy of SciencesChinese Academy of Sciences 345 Lingling Road Shanghai 200032 China
| | - Tian‐Le Xu
- Centre for Brain Science and Department of Anatomy and PhysiologyShanghai Jiao Tong University School of Medicine 280 South Chongqing Road Shanghai 200025 China
| | - Yiyun Chen
- State Key Laboratory of Bioorganic and Natural Products ChemistryCentre of Excellence in Molecular SynthesisShanghai Institute of Organic ChemistryUniversity of Chinese Academy of SciencesChinese Academy of Sciences 345 Lingling Road Shanghai 200032 China
- School of Physical Science and TechnologyShanghaiTech University 100 Haike Road Shanghai 201210 China
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16
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Wang H, Li WG, Zeng K, Wu YJ, Zhang Y, Xu TL, Chen Y. Photocatalysis Enables Visible-Light Uncaging of Bioactive Molecules in Live Cells. Angew Chem Int Ed Engl 2018; 58:561-565. [PMID: 30418695 DOI: 10.1002/anie.201811261] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2018] [Revised: 10/31/2018] [Indexed: 12/17/2022]
Abstract
The photo-manipulation of bioactive molecules provides unique advantages due to the high temporal and spatial precision of light. The first visible-light uncaging reaction by photocatalytic deboronative hydroxylation in live cells is now demonstrated. Using Fluorescein and Rhodamine derivatives as photocatalysts and ascorbates as reductants, transient hydrogen peroxides were generated from molecular oxygen to uncage phenol, alcohol, and amine functional groups on bioactive molecules in bacteria and mammalian cells, including neurons. This effective visible-light uncaging reaction enabled the light-inducible protein expression, the photo-manipulation of membrane potentials, and the subcellular-specific photo-release of small molecules.
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Affiliation(s)
- Haoyan Wang
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Centre of Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai, 200032, China
| | - Wei-Guang Li
- Centre for Brain Science and Department of Anatomy and Physiology, Shanghai Jiao Tong University School of Medicine, 280 South Chongqing Road, Shanghai, 200025, China
| | - Kaixing Zeng
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Centre of Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai, 200032, China.,School of Physical Science and Technology, ShanghaiTech University, 100 Haike Road, Shanghai, 201210, China
| | - Yan-Jiao Wu
- Centre for Brain Science and Department of Anatomy and Physiology, Shanghai Jiao Tong University School of Medicine, 280 South Chongqing Road, Shanghai, 200025, China
| | - Yixin Zhang
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Centre of Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai, 200032, China
| | - Tian-Le Xu
- Centre for Brain Science and Department of Anatomy and Physiology, Shanghai Jiao Tong University School of Medicine, 280 South Chongqing Road, Shanghai, 200025, China
| | - Yiyun Chen
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Centre of Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai, 200032, China.,School of Physical Science and Technology, ShanghaiTech University, 100 Haike Road, Shanghai, 201210, China
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17
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Nickel-catalyzed regio- and stereoselective hydrophosphinylation of internal ynamides with H-phosphinates. Tetrahedron 2018. [DOI: 10.1016/j.tet.2018.10.042] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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18
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Woźniak M, Cieślik P, Marciniak M, Lenda T, Pilc A, Wieronska JM. Neurochemical changes underlying schizophrenia-related behavior in a modified forced swim test in mice. Pharmacol Biochem Behav 2018; 172:50-58. [DOI: 10.1016/j.pbb.2018.06.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/03/2018] [Revised: 06/12/2018] [Accepted: 06/14/2018] [Indexed: 10/14/2022]
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19
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Sowaileh MF, Salyer AE, Roy KK, John JP, Woods JR, Doerksen RJ, Hockerman GH, Colby DA. Agonists of the γ-aminobutyric acid type B (GABA B) receptor derived from β-hydroxy and β-amino difluoromethyl ketones. Bioorg Med Chem Lett 2018; 28:2697-2700. [PMID: 29657102 PMCID: PMC6152937 DOI: 10.1016/j.bmcl.2018.04.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Revised: 03/31/2018] [Accepted: 04/02/2018] [Indexed: 01/26/2023]
Abstract
β-Hydroxy difluoromethyl ketones represent the newest class of agonists of the GABA-B receptor, and they are structurally distinct from all other known agonists at this receptor because they do not display the carboxylic acid or amino group of γ-aminobutyric acid (GABA). In this report, the design, synthesis, and biological evaluation of additional analogues of β-hydroxy difluoromethyl ketones characterized the critical nature of the substituted aromatic group on the lead compound. The importance of these new data is interpreted by docking studies using the X-ray structure of the GABA-B receptor. Moreover, we also report that the synthesis and biological evaluation of β-amino difluoromethyl ketones provided the most potent compound across these two series.
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Affiliation(s)
- Munia F Sowaileh
- Department of BioMolecular Sciences, University of Mississippi, University, MS 38677, United States
| | - Amy E Salyer
- Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, West Lafayette, IN 47907, United States
| | - Kuldeep K Roy
- Department of BioMolecular Sciences, University of Mississippi, University, MS 38677, United States
| | - Jinu P John
- Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, West Lafayette, IN 47907, United States
| | - James R Woods
- Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, West Lafayette, IN 47907, United States
| | - Robert J Doerksen
- Department of BioMolecular Sciences, University of Mississippi, University, MS 38677, United States
| | - Gregory H Hockerman
- Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, West Lafayette, IN 47907, United States
| | - David A Colby
- Department of BioMolecular Sciences, University of Mississippi, University, MS 38677, United States.
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20
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Park A, Uddin O, Li Y, Masri R, Keller A. Pain After Spinal Cord Injury Is Associated With Abnormal Presynaptic Inhibition in the Posterior Nucleus of the Thalamus. THE JOURNAL OF PAIN 2018; 19:727.e1-727.e15. [PMID: 29481977 DOI: 10.1016/j.jpain.2018.02.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2017] [Revised: 01/29/2018] [Accepted: 02/12/2018] [Indexed: 01/21/2023]
Abstract
Pain after spinal cord injury (SCI-Pain) is one of the most debilitating sequelae of spinal cord injury, characterized as relentless, excruciating pain that is largely refractory to treatments. Although it is generally agreed that SCI-Pain results from maladaptive plasticity in the pain processing pathway that includes the spinothalamic tract and somatosensory thalamus, the specific mechanisms underlying the development and maintenance of such pain are yet unclear. However, accumulating evidence suggests that SCI-Pain may be causally related to abnormal thalamic disinhibition, leading to hyperactivity in the posterior thalamic nucleus (PO), a higher-order nucleus involved in somatosensory and pain processing. We previously described several presynaptic mechanisms by which activity in PO is regulated, including the regulation of GABAergic as well as glutamatergic release by presynaptic metabotropic gamma-aminobutyric acid (GABAB) receptors. Using acute slices from a mouse model of SCI-Pain, we tested whether such mechanisms are affected by SCI-Pain. We reveal 2 abnormal changes in presynaptic signaling in the SCI-Pain condition. The substantial tonic activation of presynaptic GABAB receptors on GABAergic projections to PO-characteristic of normal animals-was absent in mice with SCI-Pain. Also absent in mice with SCI-Pain was the normal presynaptic regulation of glutamatergic projections to the PO by GABAB receptors. The loss of these regulatory presynaptic mechanisms in SCI-Pain may be an element of maladaptive plasticity leading to PO hyperexcitability and behavioral pain, and may suggest targets for development of novel treatments. PERSPECTIVE This report presents synaptic mechanisms that may underlie the development and maintenance of SCI-Pain. Because of the difficulty in treating SCI-Pain, a better understanding of the underlying neurobiological mechanisms is critical, and may allow development of better treatment modalities.
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Affiliation(s)
- Anthony Park
- Program in Neuroscience and Department of Anatomy and Neurobiology, University of Maryland School of Medicine, Baltimore, Maryland
| | - Olivia Uddin
- Program in Neuroscience and Department of Anatomy and Neurobiology, University of Maryland School of Medicine, Baltimore, Maryland
| | - Ying Li
- Program in Neuroscience and Department of Anatomy and Neurobiology, University of Maryland School of Medicine, Baltimore, Maryland
| | - Radi Masri
- Program in Neuroscience and Department of Anatomy and Neurobiology, University of Maryland School of Medicine, Baltimore, Maryland; Department of Endodontics, Periodontics and Prosthodontics, University of Maryland Baltimore, School of Dentistry, Baltimore, Maryland
| | - Asaf Keller
- Program in Neuroscience and Department of Anatomy and Neurobiology, University of Maryland School of Medicine, Baltimore, Maryland.
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21
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TERUNUMA M. Diversity of structure and function of GABA B receptors: a complexity of GABA B-mediated signaling. PROCEEDINGS OF THE JAPAN ACADEMY. SERIES B, PHYSICAL AND BIOLOGICAL SCIENCES 2018; 94:390-411. [PMID: 30541966 PMCID: PMC6374141 DOI: 10.2183/pjab.94.026] [Citation(s) in RCA: 71] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2018] [Accepted: 10/09/2018] [Indexed: 05/24/2023]
Abstract
γ-aminobutyric acid type B (GABAB) receptors are broadly expressed in the nervous system and play an important role in neuronal excitability. GABAB receptors are G protein-coupled receptors that mediate slow and prolonged inhibitory action, via activation of Gαi/o-type proteins. GABAB receptors mediate their inhibitory action through activating inwardly rectifying K+ channels, inactivating voltage-gated Ca2+ channels, and inhibiting adenylate cyclase. Functional GABAB receptors are obligate heterodimers formed by the co-assembly of R1 and R2 subunits. It is well established that GABAB receptors interact not only with G proteins and effectors but also with various proteins. This review summarizes the structure, subunit isoforms, and function of GABAB receptors, and discusses the complexity of GABAB receptors, including how receptors are localized in specific subcellular compartments, the mechanism regulating cell surface expression and mobility of the receptors, and the diversity of receptor signaling through receptor crosstalk and interacting proteins.
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Affiliation(s)
- Miho TERUNUMA
- Division of Oral Biochemistry, Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan
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22
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Axen SD, Huang XP, Cáceres EL, Gendelev L, Roth BL, Keiser MJ. A Simple Representation of Three-Dimensional Molecular Structure. J Med Chem 2017; 60:7393-7409. [PMID: 28731335 DOI: 10.1021/acs.jmedchem.7b00696] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Statistical and machine learning approaches predict drug-to-target relationships from 2D small-molecule topology patterns. One might expect 3D information to improve these calculations. Here we apply the logic of the extended connectivity fingerprint (ECFP) to develop a rapid, alignment-invariant 3D representation of molecular conformers, the extended three-dimensional fingerprint (E3FP). By integrating E3FP with the similarity ensemble approach (SEA), we achieve higher precision-recall performance relative to SEA with ECFP on ChEMBL20 and equivalent receiver operating characteristic performance. We identify classes of molecules for which E3FP is a better predictor of similarity in bioactivity than is ECFP. Finally, we report novel drug-to-target binding predictions inaccessible by 2D fingerprints and confirm three of them experimentally with ligand efficiencies from 0.442-0.637 kcal/mol/heavy atom.
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Affiliation(s)
- Seth D Axen
- Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco , 675 Nelson Rising Lane NS 416A, San Francisco, California 94143, United States
| | - Xi-Ping Huang
- Department of Pharmacology, University of North Carolina School of Medicine , Chapel Hill, North Carolina 27599, United States.,National Institute of Mental Health Psychoactive Drug Screening Program (NIMH PDSP), University of North Carolina , Chapel Hill, North Carolina 27599, United States
| | - Elena L Cáceres
- Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco , 675 Nelson Rising Lane NS 416A, San Francisco, California 94143, United States.,Department of Pharmaceutical Chemistry, Institute for Neurodegenerative Diseases, and Institute for Computational Health Sciences, University of California, San Francisco , 675 Nelson Rising Lane NS 416A, San Francisco, California 94143, United States
| | - Leo Gendelev
- Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco , 675 Nelson Rising Lane NS 416A, San Francisco, California 94143, United States.,Department of Pharmaceutical Chemistry, Institute for Neurodegenerative Diseases, and Institute for Computational Health Sciences, University of California, San Francisco , 675 Nelson Rising Lane NS 416A, San Francisco, California 94143, United States
| | - Bryan L Roth
- Department of Pharmacology, University of North Carolina School of Medicine , Chapel Hill, North Carolina 27599, United States.,National Institute of Mental Health Psychoactive Drug Screening Program (NIMH PDSP), University of North Carolina , Chapel Hill, North Carolina 27599, United States.,Division of Chemical Biology and Medicinal Chemistry, Eshelman School of Pharmacy, University of North Carolina at Chapel Hill , Chapel Hill, North Carolina 27599, United States
| | - Michael J Keiser
- Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco , 675 Nelson Rising Lane NS 416A, San Francisco, California 94143, United States.,Department of Pharmaceutical Chemistry, Institute for Neurodegenerative Diseases, and Institute for Computational Health Sciences, University of California, San Francisco , 675 Nelson Rising Lane NS 416A, San Francisco, California 94143, United States
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23
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Affiliation(s)
- Wu Li
- Leibniz Institute for Catalysis at the University of Rostock, Albert-Einstein-Straße 29a, 18059 Rostock, Germany
| | - Thomas Werner
- Leibniz Institute for Catalysis at the University of Rostock, Albert-Einstein-Straße 29a, 18059 Rostock, Germany
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24
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Park A, Li Y, Masri R, Keller A. Presynaptic and extrasynaptic regulation of posterior nucleus of thalamus. J Neurophysiol 2017; 118:507-519. [PMID: 28331010 DOI: 10.1152/jn.00862.2016] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2016] [Revised: 02/21/2017] [Accepted: 03/16/2017] [Indexed: 11/22/2022] Open
Abstract
The posterior nucleus of thalamus (PO) is a higher-order nucleus involved in sensorimotor processing, including nociception. An important characteristic of PO is its wide range of activity profiles that vary across states of arousal, thought to underlie differences in somatosensory perception subject to attention and degree of consciousness. Furthermore, PO loses the ability to downregulate its activity level in some forms of chronic pain, suggesting that regulatory mechanisms underlying the normal modulation of PO activity may be pathologically altered. However, the mechanisms responsible for regulating such a wide dynamic range of activity are unknown. Here, we test a series of hypotheses regarding the function of several presynaptic receptors on both GABAergic and glutamatergic afferents targeting PO in mouse, using acute slice electrophysiology. We found that presynaptic GABAB receptors are present on both GABAergic and glutamatergic terminals in PO, but only those on GABAergic terminals are tonically active. We also found that release from GABAergic terminals, but not glutamatergic terminals, is suppressed by cholinergic activation and that a subpopulation of GABAergic terminals is regulated by cannabinoids. Finally, we discovered the presence of tonic currents mediated by extrasynaptic GABAA receptors in PO that are heterogeneously distributed across the nucleus. Thus we demonstrate that multiple regulatory mechanisms concurrently exist in PO, and we propose that regulation of inhibition, rather than excitation, is the more consequential mechanism by which PO activity can be regulated.NEW & NOTEWORTHY The posterior nucleus of thalamus (PO) is a key sensorimotor structure, whose activity is tightly regulated by inhibition from several nuclei. Maladaptive plasticity in this inhibition leads to severe pathologies, including chronic pain. We reveal here, for the first time in PO, multiple regulatory mechanisms that modulate synaptic transmission within PO. These findings may lead to targeted therapies for chronic pain and other disorders.
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Affiliation(s)
- Anthony Park
- Program in Neuroscience and Department of Anatomy and Neurobiology, University of Maryland School of Medicine, Baltimore, Maryland; and
| | - Ying Li
- Program in Neuroscience and Department of Anatomy and Neurobiology, University of Maryland School of Medicine, Baltimore, Maryland; and
| | - Radi Masri
- Program in Neuroscience and Department of Anatomy and Neurobiology, University of Maryland School of Medicine, Baltimore, Maryland; and.,Department of Endodontics, Periodontics and Prosthodontics, University of Maryland Baltimore, School of Dentistry, Baltimore, Maryland
| | - Asaf Keller
- Program in Neuroscience and Department of Anatomy and Neurobiology, University of Maryland School of Medicine, Baltimore, Maryland; and
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25
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Kinbara A, Sato M, Yumita K, Yamagishi T. Copper-catalyzed hydrophosphinylation of terminal ynamides with H -phosphinates. Tetrahedron 2017. [DOI: 10.1016/j.tet.2017.02.010] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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26
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Du F, Zhou J, Peng Y. Asymmetric Reaction of α-Diazomethylphosphonates with α-Ketoesters To Access Optically Active α-Diazo-β-hydroxyphosphonate Derivatives. Org Lett 2017; 19:1310-1313. [DOI: 10.1021/acs.orglett.7b00128] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Fei Du
- Key Laboratory of Applied
Chemistry of Chongqing Municipality, School of Chemistry and Chemical
Engineering, Southwest University, Chongqing 400715, P.R. China
| | - Jiao Zhou
- Key Laboratory of Applied
Chemistry of Chongqing Municipality, School of Chemistry and Chemical
Engineering, Southwest University, Chongqing 400715, P.R. China
| | - Yungui Peng
- Key Laboratory of Applied
Chemistry of Chongqing Municipality, School of Chemistry and Chemical
Engineering, Southwest University, Chongqing 400715, P.R. China
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27
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Kostov O, Páv O, Buděšínský M, Liboska R, Šimák O, Petrová M, Novák P, Rosenberg I. 4-Toluenesulfonyloxymethyl-(H)-phosphinate: A Reagent for the Introduction of O- and S-Methyl-(H)-phosphinate Moieties. Org Lett 2016; 18:2704-7. [DOI: 10.1021/acs.orglett.6b01167] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Ondřej Kostov
- Institute of Organic
Chemistry and Biochemistry AS CR, v.v.i., Flemingovo nám. 2, 166 10 Prague 6, Czech Republic
- Department
of Chemistry of Natural Compounds, University of Chemistry and Technology, Prague, Technická 5, 160 00 Prague 6, Czech Republic
| | - Ondřej Páv
- Institute of Organic
Chemistry and Biochemistry AS CR, v.v.i., Flemingovo nám. 2, 166 10 Prague 6, Czech Republic
| | - Miloš Buděšínský
- Institute of Organic
Chemistry and Biochemistry AS CR, v.v.i., Flemingovo nám. 2, 166 10 Prague 6, Czech Republic
| | - Radek Liboska
- Institute of Organic
Chemistry and Biochemistry AS CR, v.v.i., Flemingovo nám. 2, 166 10 Prague 6, Czech Republic
| | - Ondřej Šimák
- Institute of Organic
Chemistry and Biochemistry AS CR, v.v.i., Flemingovo nám. 2, 166 10 Prague 6, Czech Republic
- Department
of Chemistry of Natural Compounds, University of Chemistry and Technology, Prague, Technická 5, 160 00 Prague 6, Czech Republic
| | - Magdalena Petrová
- Institute of Organic
Chemistry and Biochemistry AS CR, v.v.i., Flemingovo nám. 2, 166 10 Prague 6, Czech Republic
| | - Pavel Novák
- Institute of Organic
Chemistry and Biochemistry AS CR, v.v.i., Flemingovo nám. 2, 166 10 Prague 6, Czech Republic
| | - Ivan Rosenberg
- Institute of Organic
Chemistry and Biochemistry AS CR, v.v.i., Flemingovo nám. 2, 166 10 Prague 6, Czech Republic
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28
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Kupka T, Wieczorek PP. Theoretical and experimental NMR studies on muscimol from fly agaric mushroom (Amanita muscaria). SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2016; 153:216-225. [PMID: 26312739 DOI: 10.1016/j.saa.2015.08.026] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2015] [Revised: 07/13/2015] [Accepted: 08/12/2015] [Indexed: 06/04/2023]
Abstract
In this article we report results of combined theoretical and experimental NMR studies on muscimol, the bioactive alkaloid from fly agaric mushroom (Amanita muscaria). The assignment of (1)H and (13)C NMR spectra of muscimol in DMSO-d6 was supported by additional two-dimensional heteronuclear correlated spectra (2D NMR) and gauge independent atomic orbital (GIAO) NMR calculations using density functional theory (DFT). The effect of solvent in theoretical calculations was included via polarized continuum model (PCM) and the hybrid three-parameter B3LYP density functional in combination with 6-311++G(3df,2pd) basis set enabled calculation of reliable structures of non-ionized (neutral) molecule and its NH and zwitterionic forms in the gas phase, chloroform, DMSO and water. GIAO NMR calculations, using equilibrium and rovibrationally averaged geometry, at B3LYP/6-31G* and B3LYP/aug-cc-pVTZ-J levels of theory provided muscimol nuclear magnetic shieldings. The theoretical proton and carbon chemical shifts were critically compared with experimental NMR spectra measured in DMSO. Our results provide useful information on its structure in solution. We believe that such data could improve the understanding of basic features of muscimol at atomistic level and provide another tool in studies related to GABA analogs.
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Affiliation(s)
- Teobald Kupka
- Faculty of Chemistry, Opole University, Oleska 48, 45-052 Opole, Poland.
| | - Piotr P Wieczorek
- Faculty of Chemistry, Opole University, Oleska 48, 45-052 Opole, Poland.
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29
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Klein AB, Nittegaard-Nielsen M, Christensen JT, Al-Khawaja A, Wellendorph P. Demonstration of the dynamic mass redistribution label-free technology as a useful cell-based pharmacological assay for endogenously expressed GABAA receptors. MEDCHEMCOMM 2016. [DOI: 10.1039/c5md00442j] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Within the continuous quest for the discovery of pharmacologically interesting compounds, the development of new and superior drug screening assays is desired.
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Affiliation(s)
- Anders B. Klein
- Department of Drug Design and Pharmacology
- Faculty of Health and Medical Sciences
- University of Copenhagen
- DK-2100 Copenhagen
- Denmark
| | - Mia Nittegaard-Nielsen
- Department of Drug Design and Pharmacology
- Faculty of Health and Medical Sciences
- University of Copenhagen
- DK-2100 Copenhagen
- Denmark
| | - Julie T. Christensen
- Department of Drug Design and Pharmacology
- Faculty of Health and Medical Sciences
- University of Copenhagen
- DK-2100 Copenhagen
- Denmark
| | - Anas Al-Khawaja
- Department of Drug Design and Pharmacology
- Faculty of Health and Medical Sciences
- University of Copenhagen
- DK-2100 Copenhagen
- Denmark
| | - Petrine Wellendorph
- Department of Drug Design and Pharmacology
- Faculty of Health and Medical Sciences
- University of Copenhagen
- DK-2100 Copenhagen
- Denmark
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30
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Berger O, Montchamp JL. General synthesis of P-stereogenic compounds: the menthyl phosphinate approach. Org Biomol Chem 2016; 14:7552-62. [DOI: 10.1039/c6ob01413e] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Easily prepared menthyl phosphinates of high diastereoisomeric purity provide versatile intermediates for the synthesis of P-stereogenic compounds.
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Affiliation(s)
- Olivier Berger
- Chemistry and Biochemistry
- Texas Christian University
- Fort Worth
- USA
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31
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32
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Brown KM, Roy KK, Hockerman GH, Doerksen RJ, Colby DA. Activation of the γ-Aminobutyric Acid Type B (GABA(B)) Receptor by Agonists and Positive Allosteric Modulators. J Med Chem 2015; 58:6336-47. [PMID: 25856547 DOI: 10.1021/jm5018913] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Since the discovery of the GABA(B) agonist and muscle relaxant baclofen, there have been substantial advancements in the development of compounds that activate the GABA(B) receptor as agonists or positive allosteric modulators. For the agonists, most of the existing structure-activity data apply to understanding the role of substituents on the backbone of GABA as well as replacing the carboxylic acid and amine groups. In the cases of the positive allosteric modulators, the allosteric binding site(s) and structure-activity relationships are less well-defined; however, multiple classes of molecules have been discovered. The recent report of the X-ray structure of the GABA(B) receptor with bound agonists and antagonists provides new insights for the development of compounds that bind the orthosteric site of this receptor. From a therapeutic perspective, these data have enabled efforts in drug discovery in areas of addiction-related behavior, the treatment of anxiety, and the control of muscle contractility.
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Affiliation(s)
- Katie M Brown
- Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University , West Lafayette, Indiana 47907, United States
| | - Kuldeep K Roy
- Department of Biomolecular Sciences, University of Mississippi , University, Mississippi 38677, United States
| | - Gregory H Hockerman
- Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University , West Lafayette, Indiana 47907, United States
| | - Robert J Doerksen
- Department of Biomolecular Sciences, University of Mississippi , University, Mississippi 38677, United States
| | - David A Colby
- Department of Biomolecular Sciences, University of Mississippi , University, Mississippi 38677, United States
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33
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Pavlenko NV, Oos TI, Yagupolskii YL, Gerus II, Doeller U, Willms L. A novel family of (1-aminoalkyl)(trifluoromethyl)- and -(difluoromethyl)phosphinic acids - analogues of α-amino acids. Beilstein J Org Chem 2014; 10:722-31. [PMID: 24778725 PMCID: PMC3999843 DOI: 10.3762/bjoc.10.66] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2013] [Accepted: 03/05/2014] [Indexed: 12/02/2022] Open
Abstract
A series of novel (1-aminoalkyl)(trifluoromethyl)- and -(difluoromethyl)phosphinic acids - analogues of proteinogenic and nonproteinogenic α-amino acids were prepared. The synthetic methodology was based on nucleophilic addition of (trifluoromethyl)phosphinic acid or (difluoromethyl)phosphinic acid or its ethyl ester to substrates with C=N or activated C=C double bonds. Analogues of glycine, phenylglycine, alanine, valine, proline, aminomalonic and aspartic acids were thus prepared. Three-component one-pot reactions of (trifluoromethyl)phosphinic acid and dibenzylamine with aldehydes were also tested to prepare the title compounds.
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Affiliation(s)
- Natalia V Pavlenko
- Institute of Organic Chemistry National Academy of Sciences of Ukraine, Murmanskaya str. 5, 02660 Kiev-94, Ukraine
| | - Tatiana I Oos
- Institute of Organic Chemistry National Academy of Sciences of Ukraine, Murmanskaya str. 5, 02660 Kiev-94, Ukraine
| | - Yurii L Yagupolskii
- Institute of Organic Chemistry National Academy of Sciences of Ukraine, Murmanskaya str. 5, 02660 Kiev-94, Ukraine
| | - Igor I Gerus
- Institute of Bioorganic Chemistry and Petrochemistry National Academy of Sciences of Ukraine, Murmanskaya str. 1, 02660 Kiev-94, Ukraine
| | - Uwe Doeller
- Bayer CropScience Aktiengesellschaft BCS AG-R-WC-WCC-C2 Weed Control Chemistry 2, Frankfurt, G836, 101, Germany
| | - Lothar Willms
- Bayer CropScience Aktiengesellschaft BCS AG-R-WC-WCC-C2 Weed Control Chemistry 2, Frankfurt, G836, 101, Germany
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34
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Soeta T, Matsuzaki S, Ukaji Y. A one-pot O-phosphinative Passerini/Pudovik reaction: efficient synthesis of highly functionalized α-(phosphinyloxy)amide derivatives. Chemistry 2014; 20:5007-12. [PMID: 24615915 DOI: 10.1002/chem.201304618] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2013] [Revised: 01/21/2014] [Indexed: 11/07/2022]
Abstract
A one-pot O-phosphinative Passerini/Pudovik reaction has been developed, based on reacting aldehydes, isocyanides, and phosphinic acids followed by the addition of second aldehydes to form the corresponding α-(phosphinyloxy)amide derivatives. This is the first reported instance of a Passerini-type, isocyanide-based multicomponent reaction using a phosphinic acid instead of a carboxylic acid. The nucleophilicity of the phosphinate group allows a subsequent catalytic Pudovik-type reaction, affording the highly functionalized α-(phosphinyloxy)amide derivative in high yield. A wide range of aldehydes and isocyanides are applicable to this reaction.
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Affiliation(s)
- Takahiro Soeta
- Division of Material Sciences, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa, Ishikawa, 920-1192 (Japan), Fax: (+81) 76-264-5742.
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Zhang H, Sun YM, Yao L, Ji SY, Zhao CQ, Han LB. Stereogenic phosphorus-induced diastereoselective formation of chiral carbon during nucleophilic addition of chiral H-P species to aldehydes or ketones. Chem Asian J 2014; 9:1329-33. [PMID: 24591454 DOI: 10.1002/asia.201301650] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2013] [Revised: 01/06/2014] [Indexed: 11/05/2022]
Abstract
P,C-stereogenic α-hydroxyl phosphinates or phosphine oxides were prepared from the additions of (RP)-phosphinate to ketones or (RP)-phosphine oxide to aldehydes, respectively, catalyzed by bases at room temperature in up to >99:1 diasteromeric ratio (d.r.P/d.r.C) and 99 % yields. The diastereoselectivity was induced by reversible equilibrium and different stabilities between two diastereomers of adduct, which was caused by the spatial interaction between menthoxyl or menthyl to alkyl groups of aldehydes or ketones.
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Affiliation(s)
- He Zhang
- College of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng, Shandong 252059 (China), Fax: (+86) 6359239121
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36
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Synthesis, E/Z-isomerization, and cycloaddition of (E)- and (Z)-4,4,4-trifluoro-2-butenenitrile to anthracene. Russ Chem Bull 2013. [DOI: 10.1007/s11172-012-0278-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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37
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Montchamp JL. Organophosphorus Synthesis Without Phosphorus Trichloride: The Case for the Hypophosphorous Pathway. PHOSPHORUS SULFUR 2013. [DOI: 10.1080/10426507.2012.727925] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Jean-Luc Montchamp
- a Department of Chemistry , Texas Christian University , Fort Worth , Texas , USA
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Han C, Salyer AE, Kim EH, Jiang X, Jarrard RE, Powers MS, Kirchhoff AM, Salvador TK, Chester JA, Hockerman GH, Colby DA. Evaluation of difluoromethyl ketones as agonists of the γ-aminobutyric acid type B (GABAB) receptor. J Med Chem 2013; 56:2456-65. [PMID: 23428109 DOI: 10.1021/jm301805e] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
The design, synthesis, biological evaluation, and in vivo studies of difluoromethyl ketones as GABAB agonists that are not structurally analogous to known GABAB agonists, such as baclofen or 3-aminopropyl phosphinic acid, are presented. The difluoromethyl ketones were assembled in three synthetic steps using a trifluoroacetate-release aldol reaction. Following evaluation at clinically relevant GABA receptors, we have identified a difluoromethyl ketone that is a potent GABAB agonist, obtained its X-ray structure, and presented preliminary in vivo data in alcohol-preferring mice. The behavioral studies in mice demonstrated that this compound tended to reduce the acoustic startle response, which is consistent with an anxiolytic profile. Structure-activity investigations determined that replacing the fluorines of the difluoromethyl ketone with hydrogens resulted in an inactive analogue. Resolution of the individual enantiomers of the difluoromethyl ketone provided a compound with full biological activity at concentrations less than an order of magnitude greater than the pharmaceutical, baclofen.
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Affiliation(s)
- Changho Han
- Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, West Lafayette, Indiana 47907, USA
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Abstract
The carboxylic acid functional group can be an important constituent of a pharmacophore, however, the presence of this moiety can also be responsible for significant drawbacks, including metabolic instability, toxicity, as well as limited passive diffusion across biological membranes. To avoid some of these shortcomings while retaining the desired attributes of the carboxylic acid moiety, medicinal chemists often investigate the use of carboxylic acid (bio)isosteres. The same type of strategy can also be effective for a variety other purposes, for example, to increase the selectivity of a biologically active compound or to create new intellectual property. Several carboxylic acid isosteres have been reported, however, the outcome of any isosteric replacement cannot be readily predicted as this strategy is generally found to be dependent upon the particular context (i.e., the characteristic properties of the drug and the drug-target). As a result, screening of a panel of isosteres is typically required. In this context, the discovery and development of novel carboxylic acid surrogates that could complement the existing palette of isosteres remains an important area of research. The goal of this Minireview is to provide an overview of the most commonly employed carboxylic acid (bio)isosteres and to present representative examples demonstrating the use and utility of each isostere in drug design.
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Affiliation(s)
- Carlo Ballatore
- Department of Chemistry, University of Pennsylvania, 231 South 34th St., Philadelphia, PA 19104, USA.
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41
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Corbett MT, Johnson JS. Diametric stereocontrol in dynamic catalytic reduction of racemic acyl phosphonates: divergence from α-keto ester congeners. J Am Chem Soc 2013; 135:594-7. [PMID: 23297694 PMCID: PMC3552383 DOI: 10.1021/ja310980q] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
An unexpected dichotomy was observed in the Ru-catalyzed asymmetric transfer hydrogenation of acyl phosphonates: reduction proceeded from the opposite face relative to that observed in the analogous reduction of α-keto esters. The first highly selective catalytic hydrogenation of acyl phosphonates was utilized in the dynamic kinetic resolution of α-aryl acyl phosphonates, providing β-stereogenic α-hydroxy phosphonic acid derivatives.
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Affiliation(s)
- Michael T. Corbett
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, 27599-3290, United States
| | - Jeffrey S. Johnson
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, 27599-3290, United States
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Yamagishi T, Kinbara A, Okubo N, Sato S, Fukaya H. Diastereoselective synthesis of Pro-Phe phosphinyl dipeptide isosteres. ACTA ACUST UNITED AC 2012. [DOI: 10.1016/j.tetasy.2012.10.019] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Masharina A, Reymond L, Maurel D, Umezawa K, Johnsson K. A Fluorescent Sensor for GABA and Synthetic GABAB Receptor Ligands. J Am Chem Soc 2012; 134:19026-34. [DOI: 10.1021/ja306320s] [Citation(s) in RCA: 84] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Anastasiya Masharina
- Institute of Chemical
Sciences and Engineering (ISIC),
Institute of Bioengineering, NCCR in Chemical Biology, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland
| | - Luc Reymond
- Institute of Chemical
Sciences and Engineering (ISIC),
Institute of Bioengineering, NCCR in Chemical Biology, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland
| | - Damien Maurel
- Institute of Chemical
Sciences and Engineering (ISIC),
Institute of Bioengineering, NCCR in Chemical Biology, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland
| | - Keitaro Umezawa
- Institute of Chemical
Sciences and Engineering (ISIC),
Institute of Bioengineering, NCCR in Chemical Biology, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland
| | - Kai Johnsson
- Institute of Chemical
Sciences and Engineering (ISIC),
Institute of Bioengineering, NCCR in Chemical Biology, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland
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Yamamoto I, Absalom N, Carland JE, Doddareddy M, Gavande N, Johnston GAR, Hanrahan JR, Chebib M. Differentiating enantioselective actions of GABOB: a possible role for threonine 244 in the binding site of GABA(C) ρ(1) receptors. ACS Chem Neurosci 2012; 3:665-73. [PMID: 23019493 PMCID: PMC3447397 DOI: 10.1021/cn3000229] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2012] [Accepted: 04/26/2012] [Indexed: 01/20/2023] Open
Abstract
Designing potent and subtype-selective ligands with therapeutic value requires knowledge about how endogenous ligands interact with their binding site. 4-Amino-3-hydroxybutanoic acid (GABOB) is an endogenous ligand found in the central nervous system in mammals. It is a metabolic product of GABA, the major inhibitory neurotransmitter. Homology modeling of the GABA(C) ρ(1) receptor revealed a potential H-bond interaction between the hydroxyl group of GABOB and threonine 244 (T244) located on loop C of the ligand binding site of the ρ(1) subunit. Using site-directed mutagenesis, we examined the effect of mutating T244 on the efficacy and pharmacology of GABOB and various ligands. It was found that mutating T244 to amino acids that lacked a hydroxyl group in their side chains produced GABA insensitive receptors. Only by mutating ρ(1)T244 to serine (ρ(1)T244S) produced a GABA responsive receptor, albeit 39-fold less sensitive to GABA than ρ(1)wild-type. We also observed changes in the activities of the GABA(C) receptor partial agonists, muscimol and imidazole-4-acetic acid (I4AA). At the concentrations we tested, the partial agonists antagonized GABA-induced currents at ρ(1)T244S mutant receptors (Muscimol: ρ(1)wild-type, EC(50) = 1.4 μM; ρ(1)T244S, IC(50) = 32.8 μM. I4AA: ρ(1)wild-type, EC(50) = 8.6 μM; ρ(1)T244S, IC(50) = 21.4 μM). This indicates that T244 is predominantly involved in channel gating. R-(-)-GABOB and S-(+)-GABOB are full agonists at ρ(1)wild-type receptors. In contrast, R-(-)-GABOB was a weak partial agonist at ρ(1)T244S (1 mM activates 26% of the current produced by GABA EC(50) versus ρ(1)wild-type, EC(50) = 19 μM; I(max) 100%), and S-(+)-GABOB was a competitive antagonist at ρ(1)T244S receptors (ρ(1)wild-type, EC(50) = 45 μM versus ρ(1)T244S, IC(50) = 417.4 μM, K(B) = 204 μM). This highlights that the interaction of GABOB with T244 is enantioselective. In contrast, the potencies of a range of antagonists tested, 3-aminopropyl(methyl)phosphinic acid (3-APMPA), 3-aminopropylphosphonic acid (3-APA), S- and R-(3-amino-2-hydroxypropyl)methylphosphinic acid (S-(-)-CGP44532 and R-(+)-CGP44533), were not altered. This suggests that T244 is not critical for antagonist binding. Receptor gating is dynamic, and this study highlights the role of loop C in agonist-evoked receptor activation, coupling agonist binding to channel gating.
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Affiliation(s)
- Izumi Yamamoto
- Faculty of
Pharmacy, The University of Sydney, Sydney,
NSW 2006, Australia
| | - Nathan Absalom
- Faculty of
Pharmacy, The University of Sydney, Sydney,
NSW 2006, Australia
| | - Jane E. Carland
- Department
of Pharmacology, The University of Sydney, Sydney, NSW 2006, Australia
| | | | - Navnath Gavande
- Faculty of
Pharmacy, The University of Sydney, Sydney,
NSW 2006, Australia
| | | | - Jane R. Hanrahan
- Faculty of
Pharmacy, The University of Sydney, Sydney,
NSW 2006, Australia
| | - Mary Chebib
- Faculty of
Pharmacy, The University of Sydney, Sydney,
NSW 2006, Australia
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45
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Gavara L, Petit C, Montchamp JL. DBU-promoted alkylation of alkyl phosphinates and H-phosphonates. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.07.019] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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46
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Yañez Rodríguez V, del Águila MÁ, Iglesias MJ, López Ortiz F. Directed ortho-lithiation of unprotected diphenylphosphinic acids. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.06.088] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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47
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Lehmann A, Antonsson M, Aurell-Holmberg A, Blackshaw LA, Brändén L, Elebring T, Jensen J, Kärrberg L, Mattsson JP, Nilsson K, Oja SS, Saransaari P, von Unge S. Different in vitro and in vivo profiles of substituted 3-aminopropylphosphinate and 3-aminopropyl(methyl)phosphinate GABA(B) receptor agonists as inhibitors of transient lower oesophageal sphincter relaxation. Br J Pharmacol 2012; 165:1757-1772. [PMID: 21950457 DOI: 10.1111/j.1476-5381.2011.01682.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
BACKGROUND AND PURPOSE Gastro-oesophageal reflux is predominantly caused by transient lower oesophageal sphincter relaxation (TLOSR) and GABA(B) receptor stimulation inhibits TLOSR. Lesogaberan produces fewer CNS side effects than baclofen, which has been attributed to its affinity for the GABA transporter (GAT), the action of which limits stimulation of central GABA(B) receptors. To understand the structure-activity relationship for analogues of lesogaberan (3-aminopropylphosphinic acids), and corresponding 3-aminopropyl(methyl)phosphinic acids, we have compared representatives of these classes in different in vitro and in vivo models. EXPERIMENTAL APPROACH The compounds were characterized in terms of GABA(B) agonism in vitro. Binding to GATs and cellular uptake was done using rat brain membranes and slices respectively. TLOSR was measured in dogs, and CNS side effects were evaluated as hypothermia in mice and rats. KEY RESULTS 3-Aminopropylphosphinic acids inhibited TLOSR with a superior therapeutic index compared to 3-aminopropyl(methyl)phosphinic acids. This difference was most likely due to differential GAT-mediated uptake into brain cells of the former but not latter. In agreement, 3-aminopropyl(methyl)phosphinic acids were much more potent in producing hypothermia in rats even when administered i.c.v. CONCLUSIONS AND IMPLICATIONS An enhanced therapeutic window for 3-aminopropylphosphinic acids compared with 3-aminopropyl(methyl)phosphinic acids with respect to inhibition of TLOSR was observed and is probably mechanistically linked to neural cell uptake of the former but not latter group of compounds. These findings offer a platform for discovery of new GABA(B) receptor agonists for the treatment of reflux disease and other conditions where selective peripheral GABA(B) receptor agonism may afford therapeutic effects.
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Affiliation(s)
- A Lehmann
- AstraZeneca R&D, Mölndal, SwedenNerve Gut Research Laboratory, Hanson Institute, Department of Gastroenterology and Hepatology, Royal Adelaide Hospital, and University of Adelaide, South Australia, AustraliaDepartment of Paediatrics, Tampere University Hospital, FinlandBrain Research Center, Medical School, University of Tampere, Finland
| | - M Antonsson
- AstraZeneca R&D, Mölndal, SwedenNerve Gut Research Laboratory, Hanson Institute, Department of Gastroenterology and Hepatology, Royal Adelaide Hospital, and University of Adelaide, South Australia, AustraliaDepartment of Paediatrics, Tampere University Hospital, FinlandBrain Research Center, Medical School, University of Tampere, Finland
| | - A Aurell-Holmberg
- AstraZeneca R&D, Mölndal, SwedenNerve Gut Research Laboratory, Hanson Institute, Department of Gastroenterology and Hepatology, Royal Adelaide Hospital, and University of Adelaide, South Australia, AustraliaDepartment of Paediatrics, Tampere University Hospital, FinlandBrain Research Center, Medical School, University of Tampere, Finland
| | - L A Blackshaw
- AstraZeneca R&D, Mölndal, SwedenNerve Gut Research Laboratory, Hanson Institute, Department of Gastroenterology and Hepatology, Royal Adelaide Hospital, and University of Adelaide, South Australia, AustraliaDepartment of Paediatrics, Tampere University Hospital, FinlandBrain Research Center, Medical School, University of Tampere, Finland
| | - L Brändén
- AstraZeneca R&D, Mölndal, SwedenNerve Gut Research Laboratory, Hanson Institute, Department of Gastroenterology and Hepatology, Royal Adelaide Hospital, and University of Adelaide, South Australia, AustraliaDepartment of Paediatrics, Tampere University Hospital, FinlandBrain Research Center, Medical School, University of Tampere, Finland
| | - T Elebring
- AstraZeneca R&D, Mölndal, SwedenNerve Gut Research Laboratory, Hanson Institute, Department of Gastroenterology and Hepatology, Royal Adelaide Hospital, and University of Adelaide, South Australia, AustraliaDepartment of Paediatrics, Tampere University Hospital, FinlandBrain Research Center, Medical School, University of Tampere, Finland
| | - J Jensen
- AstraZeneca R&D, Mölndal, SwedenNerve Gut Research Laboratory, Hanson Institute, Department of Gastroenterology and Hepatology, Royal Adelaide Hospital, and University of Adelaide, South Australia, AustraliaDepartment of Paediatrics, Tampere University Hospital, FinlandBrain Research Center, Medical School, University of Tampere, Finland
| | - L Kärrberg
- AstraZeneca R&D, Mölndal, SwedenNerve Gut Research Laboratory, Hanson Institute, Department of Gastroenterology and Hepatology, Royal Adelaide Hospital, and University of Adelaide, South Australia, AustraliaDepartment of Paediatrics, Tampere University Hospital, FinlandBrain Research Center, Medical School, University of Tampere, Finland
| | - J P Mattsson
- AstraZeneca R&D, Mölndal, SwedenNerve Gut Research Laboratory, Hanson Institute, Department of Gastroenterology and Hepatology, Royal Adelaide Hospital, and University of Adelaide, South Australia, AustraliaDepartment of Paediatrics, Tampere University Hospital, FinlandBrain Research Center, Medical School, University of Tampere, Finland
| | - K Nilsson
- AstraZeneca R&D, Mölndal, SwedenNerve Gut Research Laboratory, Hanson Institute, Department of Gastroenterology and Hepatology, Royal Adelaide Hospital, and University of Adelaide, South Australia, AustraliaDepartment of Paediatrics, Tampere University Hospital, FinlandBrain Research Center, Medical School, University of Tampere, Finland
| | - S S Oja
- AstraZeneca R&D, Mölndal, SwedenNerve Gut Research Laboratory, Hanson Institute, Department of Gastroenterology and Hepatology, Royal Adelaide Hospital, and University of Adelaide, South Australia, AustraliaDepartment of Paediatrics, Tampere University Hospital, FinlandBrain Research Center, Medical School, University of Tampere, Finland
| | - P Saransaari
- AstraZeneca R&D, Mölndal, SwedenNerve Gut Research Laboratory, Hanson Institute, Department of Gastroenterology and Hepatology, Royal Adelaide Hospital, and University of Adelaide, South Australia, AustraliaDepartment of Paediatrics, Tampere University Hospital, FinlandBrain Research Center, Medical School, University of Tampere, Finland
| | - S von Unge
- AstraZeneca R&D, Mölndal, SwedenNerve Gut Research Laboratory, Hanson Institute, Department of Gastroenterology and Hepatology, Royal Adelaide Hospital, and University of Adelaide, South Australia, AustraliaDepartment of Paediatrics, Tampere University Hospital, FinlandBrain Research Center, Medical School, University of Tampere, Finland
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48
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Berger O, Gavara L, Montchamp JL. Chemistry of the Versatile (Hydroxymethyl)phosphinyl P(O)CH2OH Functional Group. Org Lett 2012; 14:3404-7. [DOI: 10.1021/ol3013793] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Olivier Berger
- Department of Chemistry, Box 298860, Texas Christian University, Fort Worth, Texas 76129, United States
| | - Laurent Gavara
- Department of Chemistry, Box 298860, Texas Christian University, Fort Worth, Texas 76129, United States
| | - Jean-Luc Montchamp
- Department of Chemistry, Box 298860, Texas Christian University, Fort Worth, Texas 76129, United States
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Kussrow A, Enders CS, Bornhop DJ. Interferometric methods for label-free molecular interaction studies. Anal Chem 2012; 84:779-92. [PMID: 22060037 PMCID: PMC4317347 DOI: 10.1021/ac202812h] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Amanda Kussrow
- Department of Chemistry and Vanderbilt Institute of Chemical Biology, Vanderbilt University, 7330 Stevenson Center, Nashville, Tennessee 37235, United States
| | - Carolyn S. Enders
- Department of Chemistry and Vanderbilt Institute of Chemical Biology, Vanderbilt University, 7330 Stevenson Center, Nashville, Tennessee 37235, United States
| | - Darryl J. Bornhop
- Department of Chemistry and Vanderbilt Institute of Chemical Biology, Vanderbilt University, 7330 Stevenson Center, Nashville, Tennessee 37235, United States
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Xu F, Peng G, Phan T, Dilip U, Chen JL, Chernov-Rogan T, Zhang X, Grindstaff K, Annamalai T, Koller K, Gallop MA, Wustrow DJ. Discovery of a novel potent GABA(B) receptor agonist. Bioorg Med Chem Lett 2011; 21:6582-5. [PMID: 21920749 DOI: 10.1016/j.bmcl.2011.08.006] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2011] [Revised: 07/29/2011] [Accepted: 08/01/2011] [Indexed: 10/17/2022]
Abstract
Structure-activity studies have led to a discovery of 3-(4-pyridyl)methyl ether derivative 9d that has 25- to 50-fold greater functional potency than R-baclofen at human and rodent GABA(B) receptors in vitro. Mouse hypothermia studies confirm that this compound crosses the blood-brain barrier and is approximately 50-fold more potent after systemic administration.
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Affiliation(s)
- Feng Xu
- XenoPort Inc., 3410 Central Expressway, Santa Clara, CA 95051, USA
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