Arbaclofen
Identification
- Generic Name
- Arbaclofen
- DrugBank Accession Number
- DB08891
- Background
Arbaclofen, or STX209, is the R-enantiomer of baclofen. It is believed to be a selective gamma-amino butyric acid type B receptor agonist, and has been investigated as a treatment for autism spectrum disorder and fragile X syndrome in randomized, double blind, placebo controlled trials. It has also been investigated as a treatment for spasticity due to multiple sclerosis and spinal cord injury. Arbaclofen was investigated as a treatment for gastroesophageal reflux disease (GERD); however, with disappointing results.
- Type
- Small Molecule
- Groups
- Investigational
- Structure
- Weight
- Average: 213.661
Monoisotopic: 213.05565634 - Chemical Formula
- C10H12ClNO2
- Synonyms
- (R)-4-amino-3-(4-chlorophenyl)butanoic acid
- (R)-Baclofen
- Arbaclofen
- External IDs
- OS440
- STX-209
- STX209
Pharmacology
- Indication
Investigated in clinical trials as a potential treatment for spasticity in multiple sclerosis, autism spectrum disorder, and social withdrawal in fragile X syndrome.
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- Pharmacodynamics
Not Available
- Mechanism of action
Arbaclofen, or R-baclofen, acts upstream of the mGluR5 receptor to increase inhibitory neurotransmission. It is the isomer of baclofen which harbors antispastic activity.
Target Actions Organism AGamma-aminobutyric acid type B receptor subunit 1 agonistHumans AGamma-aminobutyric acid type B receptor subunit 2 agonistHumans - Absorption
Unlike baclofen, absorption of arbaclofen is not limited to the upper small intestine. Arbaclofen can also be absorbed in the lower small intestine and the colon, allowing for the development of sustained release formulations.
- Volume of distribution
Not Available
- Protein binding
Not Available
- Metabolism
- Not Available
- Route of elimination
>80% of R-baclofen is renally eliminated unchanged.
- Half-life
Not Available
- Clearance
Blood clearance of an IV bolus of R-baclofen in rats, monkeys, and dogs, resulted in a half life of 1.6-3.4hours, in one study. Total blood clearance was reported to be 0.51±0.13L/h/kg in rats, 0.31±0.11L/h/kg in monkeys, and 0.24±0.01L/h/kg in dogs. (2)
- Adverse Effects
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- Toxicity
Not Available
- Pathways
- Not Available
- Pharmacogenomic Effects/ADRs
- Not Available
Interactions
- Drug Interactions
- This information should not be interpreted without the help of a healthcare provider. If you believe you are experiencing an interaction, contact a healthcare provider immediately. The absence of an interaction does not necessarily mean no interactions exist.Not Available
- Food Interactions
- Not Available
Categories
- Drug Categories
- Not Available
- Chemical TaxonomyProvided by Classyfire
- Description
- This compound belongs to the class of organic compounds known as gamma amino acids and derivatives. These are amino acids having a (-NH2) group attached to the gamma carbon atom.
- Kingdom
- Organic compounds
- Super Class
- Organic acids and derivatives
- Class
- Carboxylic acids and derivatives
- Sub Class
- Amino acids, peptides, and analogues
- Direct Parent
- Gamma amino acids and derivatives
- Alternative Parents
- Phenylpropanoic acids / Chlorobenzenes / Aralkylamines / Amino fatty acids / Aryl chlorides / Amino acids / Monocarboxylic acids and derivatives / Carboxylic acids / Organopnictogen compounds / Organochlorides show 4 more
- Substituents
- 3-phenylpropanoic-acid / Amine / Amino acid / Amino fatty acid / Aralkylamine / Aromatic homomonocyclic compound / Aryl chloride / Aryl halide / Benzenoid / Carbonyl group show 18 more
- Molecular Framework
- Aromatic homomonocyclic compounds
- External Descriptors
- Not Available
- Affected organisms
- Not Available
Chemical Identifiers
- UNII
- NYU6UTW25B
- CAS number
- 69308-37-8
- InChI Key
- KPYSYYIEGFHWSV-QMMMGPOBSA-N
- InChI
- InChI=1S/C10H12ClNO2/c11-9-3-1-7(2-4-9)8(6-12)5-10(13)14/h1-4,8H,5-6,12H2,(H,13,14)/t8-/m0/s1
- IUPAC Name
- (3R)-4-amino-3-(4-chlorophenyl)butanoic acid
- SMILES
- [H][C@@](CN)(CC(O)=O)C1=CC=C(Cl)C=C1
References
- General References
- Nance PW, Huff FJ, Martinez-Arizala A, Ayyoub Z, Chen D, Bian A, Stamler D: Efficacy and safety study of arbaclofen placarbil in patients with spasticity due to spinal cord injury. Spinal Cord. 2011 Sep;49(9):974-80. doi: 10.1038/sc.2011.43. Epub 2011 May 17. [Article]
- Lal R, Sukbuntherng J, Tai EH, Upadhyay S, Yao F, Warren MS, Luo W, Bu L, Nguyen S, Zamora J, Peng G, Dias T, Bao Y, Ludwikow M, Phan T, Scheuerman RA, Yan H, Gao M, Wu QQ, Annamalai T, Raillard SP, Koller K, Gallop MA, Cundy KC: Arbaclofen placarbil, a novel R-baclofen prodrug: improved absorption, distribution, metabolism, and elimination properties compared with R-baclofen. J Pharmacol Exp Ther. 2009 Sep;330(3):911-21. doi: 10.1124/jpet.108.149773. Epub 2009 Jun 5. [Article]
- External Links
- PubChem Compound
- 44602
- PubChem Substance
- 347827809
- ChemSpider
- 40580
- BindingDB
- 50032964
- ChEMBL
- CHEMBL301742
- ZINC
- ZINC000000000061
- PDBe Ligand
- 2C0
- Wikipedia
- Arbaclofen_placarbil
- PDB Entries
- 4ms4 / 7c7q / 7eb2
Clinical Trials
- Clinical Trials
Phase Status Purpose Conditions Count 3 Completed Treatment Fragile X Syndrome 2 3 Completed Treatment Multiple Sclerosis / Spasticity 2 3 Completed Treatment Multiple Sclerosis / Spasticity, Muscle 2 3 Not Yet Recruiting Treatment Spasticity 1 3 Terminated Treatment Autism Disorder 1
Pharmacoeconomics
- Manufacturers
- Not Available
- Packagers
- Not Available
- Dosage Forms
- Not Available
- Prices
- Not Available
- Patents
- Not Available
Properties
- State
- Solid
- Experimental Properties
Property Value Source melting point (°C) 206-208 °C Not Available water solubility 2090 mg/L Not Available logP 1.3 Not Available - Predicted Properties
Property Value Source Water Solubility 0.712 mg/mL ALOGPS logP -0.82 ALOGPS logP -0.78 Chemaxon logS -2.5 ALOGPS pKa (Strongest Acidic) 3.89 Chemaxon pKa (Strongest Basic) 9.79 Chemaxon Physiological Charge 0 Chemaxon Hydrogen Acceptor Count 3 Chemaxon Hydrogen Donor Count 2 Chemaxon Polar Surface Area 63.32 Å2 Chemaxon Rotatable Bond Count 4 Chemaxon Refractivity 54.83 m3·mol-1 Chemaxon Polarizability 21.11 Å3 Chemaxon Number of Rings 1 Chemaxon Bioavailability 1 Chemaxon Rule of Five Yes Chemaxon Ghose Filter No Chemaxon Veber's Rule No Chemaxon MDDR-like Rule No Chemaxon - Predicted ADMET Features
- Not Available
Spectra
- Mass Spec (NIST)
- Not Available
- Spectra
- Chromatographic Properties
Collision Cross Sections (CCS)
Adduct CCS Value (Å2) Source type Source [M-H]- 148.24968 predictedDeepCCS 1.0 (2019) [M+H]+ 150.56892 predictedDeepCCS 1.0 (2019) [M+Na]+ 156.48145 predictedDeepCCS 1.0 (2019)
Targets
- Kind
- Protein
- Organism
- Humans
- Pharmacological action
- Yes
- Actions
- Agonist
- General Function
- G-protein coupled gaba receptor activity
- Specific Function
- Component of a heterodimeric G-protein coupled receptor for GABA, formed by GABBR1 and GABBR2. Within the heterodimeric GABA receptor, only GABBR1 seems to bind agonists, while GABBR2 mediates coup...
- Gene Name
- GABBR1
- Uniprot ID
- Q9UBS5
- Uniprot Name
- Gamma-aminobutyric acid type B receptor subunit 1
- Molecular Weight
- 108319.4 Da
References
- Bowery NG: GABAB receptor pharmacology. Annu Rev Pharmacol Toxicol. 1993;33:109-47. [Article]
- Chen X, Ji ZL, Chen YZ: TTD: Therapeutic Target Database. Nucleic Acids Res. 2002 Jan 1;30(1):412-5. [Article]
- Garcia-Gil L, de Miguel R, Romero J, Perez A, Ramos JA, Fernandez-Ruiz JJ: Perinatal delta9-tetrahydrocannabinol exposure augmented the magnitude of motor inhibition caused by GABA(B), but not GABA(A), receptor agonists in adult rats. Neurotoxicol Teratol. 1999 May-Jun;21(3):277-83. [Article]
- Lehmann A: GABAB receptors as drug targets to treat gastroesophageal reflux disease. Pharmacol Ther. 2009 Jun;122(3):239-45. doi: 10.1016/j.pharmthera.2009.02.008. Epub 2009 Mar 19. [Article]
- Motalli R, Louvel J, Tancredi V, Kurcewicz I, Wan-Chow-Wah D, Pumain R, Avoli M: GABA(B) receptor activation promotes seizure activity in the juvenile rat hippocampus. J Neurophysiol. 1999 Aug;82(2):638-47. [Article]
- Mott DD, Li Q, Okazaki MM, Turner DA, Lewis DV: GABAB-Receptor-mediated currents in interneurons of the dentate-hilus border. J Neurophysiol. 1999 Sep;82(3):1438-50. [Article]
- Ogasawara T, Itoh Y, Tamura M, Mushiroi T, Ukai Y, Kise M, Kimura K: Involvement of cholinergic and GABAergic systems in the reversal of memory disruption by NS-105, a cognition enhancer. Pharmacol Biochem Behav. 1999 Sep;64(1):41-52. [Article]
- Pittman QJ: The action is at the terminal. J Physiol. 1999 Nov 1;520 Pt 3:629. [Article]
- Stringer JL, Lorenzo N: The reduction in paired-pulse inhibition in the rat hippocampus by gabapentin is independent of GABA(B) receptor receptor activation. Epilepsy Res. 1999 Feb;33(2-3):169-76. [Article]
- Kind
- Protein
- Organism
- Humans
- Pharmacological action
- Yes
- Actions
- Agonist
- General Function
- G-protein coupled gaba receptor activity
- Specific Function
- Component of a heterodimeric G-protein coupled receptor for GABA, formed by GABBR1 and GABBR2. Within the heterodimeric GABA receptor, only GABBR1 seems to bind agonists, while GABBR2 mediates coup...
- Gene Name
- GABBR2
- Uniprot ID
- O75899
- Uniprot Name
- Gamma-aminobutyric acid type B receptor subunit 2
- Molecular Weight
- 105820.52 Da
References
- Belley M, Sullivan R, Reeves A, Evans J, O'Neill G, Ng GY: Synthesis of the nanomolar photoaffinity GABA(B) receptor ligand CGP 71872 reveals diversity in the tissue distribution of GABA(B) receptor forms. Bioorg Med Chem. 1999 Dec;7(12):2697-704. [Article]
- Braun M, Wendt A, Buschard K, Salehi A, Sewing S, Gromada J, Rorsman P: GABAB receptor activation inhibits exocytosis in rat pancreatic beta-cells by G-protein-dependent activation of calcineurin. J Physiol. 2004 Sep 1;559(Pt 2):397-409. Epub 2004 Jul 2. [Article]
- Bowery NG: GABAB receptor pharmacology. Annu Rev Pharmacol Toxicol. 1993;33:109-47. [Article]
- Filippov AK, Couve A, Pangalos MN, Walsh FS, Brown DA, Moss SJ: Heteromeric assembly of GABA(B)R1 and GABA(B)R2 receptor subunits inhibits Ca(2+) current in sympathetic neurons. J Neurosci. 2000 Apr 15;20(8):2867-74. [Article]
- Jones KA, Tamm JA, Craig DA, Ph D, Yao W, Panico R: Signal transduction by GABA(B) receptor heterodimers. Neuropsychopharmacology. 2000 Oct;23(4 Suppl):S41-9. [Article]
- Lehmann A: GABAB receptors as drug targets to treat gastroesophageal reflux disease. Pharmacol Ther. 2009 Jun;122(3):239-45. doi: 10.1016/j.pharmthera.2009.02.008. Epub 2009 Mar 19. [Article]
- Martin SC, Russek SJ, Farb DH: Molecular identification of the human GABABR2: cell surface expression and coupling to adenylyl cyclase in the absence of GABABR1. Mol Cell Neurosci. 1999 Mar;13(3):180-91. [Article]
- Pittman QJ: The action is at the terminal. J Physiol. 1999 Nov 1;520 Pt 3:629. [Article]
Drug created at May 30, 2013 19:42 / Updated at February 21, 2021 18:52