title: Structure-activity relationship study of selective excitatory amino acid transporter subtype 1 (EAAT1) inhibitor 2-amino-4-(4-methoxyphenyl)-7-(naphthalen-1-yl)-5-oxo-5,6,7,8-tetrahydro-4H-chromene-3-carbonitrile (UCPH-101) and absolute configurational assignment using infrared and vibrational circular dichroism spectroscopy in combination with ab initio Hartree-Fock calculations.
abstract: The excitatory amino acid transporters (EAATs) play essential roles in regulating the synaptic concentration of the neurotransmitter glutamate in the mammalian central nervous system. To date, five subtypes have been identified, named EAAT1-5 in humans, and GLAST, GLT-1, EAAC1, EAAT4, and EAAT5 in rodents, respectively. In this paper, we present the design, synthesis, and pharmacological evaluation of seven 7-N-substituted analogues of UCPH-101/102. Analogue 9 inhibited EAAT1 in the micromolar range (IC(50) value 20 μM), whereas analogues 8 and 10 were inactive (IC(50) values >100 μM). The diastereomeric pairs 11a/11b and 12a/12b were separated by HPLC and the absolute configuration assigned by VCD technique in combination with ab initio Hartree-Fock calculations. Analogues 11a (RS-isomer) and 12b (RR-isomer) inhibited EAAT1 (IC(50) values 5.5 and 3.8 μM, respectively), whereas analogues 11b (SS-isomer) and 12a (SR-isomer) failed to inhibit EAAT1 uptake (IC(50) values >300 μM).
authors.affiliation: Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, DK-2100 Copenhagen, Denmark.
authors.forename: Tri H V
authors.initials: TH
authors.lastname: Huynh
authors.forename: Irene
authors.initials: I
authors.lastname: Shim
authors.forename: Henrik
authors.initials: H
authors.lastname: Bohr
authors.forename: Bjarke
authors.initials: B
authors.lastname: Abrahamsen
authors.forename: Birgitte
authors.initials: B
authors.lastname: Nielsen
authors.forename: Anders A
authors.initials: AA
authors.lastname: Jensen
authors.forename: Lennart
authors.initials: L
authors.lastname: Bunch
mesh_terms: D001224:Aspartic Acid / Q000378:metabolism; D001578:Benzopyrans / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D002942:Circular Dichroism; D027341:Excitatory Amino Acid Transporter 1 / Q000037:antagonists & inhibitors*; D057809:HEK293 Cells; D006801:Humans; D008958:Models, Molecular; D008968:Molecular Conformation; D017550:Spectroscopy, Fourier Transform Infrared; D013237:Stereoisomerism; D013329:Structure-Activity Relationship; D044366:Transition Temperature
chemical_list: C553295:2-amino-4-(4-methoxyphenyl)-7-(naphthalen-1-yl)-5-oxo-5,6,7,8-tetrahydro-4H-chromene-3-carbonitrile; D001578:Benzopyrans; D027341:Excitatory Amino Acid Transporter 1; D001224:Aspartic Acid