TY - JOUR
T1 - N-(7-(1H-imidazol-1-yl)-2,3-dioxo-6-(trifluoromethyl)-3,4-dihydroquinoxalin-1(2H)-yl)benzamide - a new kainate receptor selective antagonist and analgesic
T2 - Synthesis, X-ray crystallography, structure-affinity relationships, in vitro and in vivo pharmacology
AU - Møllerud, Stine
AU - Hansen, Rie B
AU - Pallesen, Jakob S
AU - Temperini, Piero
AU - Pasini, Diletta
AU - Bornholdt, Jan
AU - Nielsen, Birgitte
AU - Mamedova, Esmira
AU - Chalupnik, Paulina
AU - Paternain, Ana V
AU - Lerma, Juan
AU - Del Castillo, Marta Diaz
AU - Andreasen, Jesper T
AU - Frydenvang, Karla
AU - Kastrup, Jette Sandholm
AU - Johansen, Tommy N
AU - Pickering, Darryl S
PY - 2019
Y1 - 2019
N2 - Selective pharmacological tool compounds are invaluable for understanding the functions of the various ionotropic glutamate receptor subtypes. For the kainate receptors, these compounds are few. Here we have synthesized nine novel quinoxaline-2,3-diones with substitutions in the 7-position to investigate the structure-activity relationship at kainate and α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptors. Compound 11 exhibited the highest binding affinity across GluK1-3 while having selectivity toward kainate vs AMPA receptors. Compound 11 potently inhibited glutamate evoked currents at homomeric GluK1 and GluK3 receptors in HEK293 cells with Kb values of 65 and 39 nM, respectively. The binding mode of 11 in the ligand binding domain of GluK1 was investigated by X-ray crystallography, revealing that 11 stabilizes the receptor in an open conformation, consistent with its demonstrated antagonism. Furthermore, 11 was tested for analgesic effects in the mouse tail flick test where it significantly increased tail flick latency at doses where 2,3-dioxo-6-nitro-1,2,3,4-tetrahydrobenzo[f]-quinoxaline-7-sulfonamide (NBQX) was ineffective.
AB - Selective pharmacological tool compounds are invaluable for understanding the functions of the various ionotropic glutamate receptor subtypes. For the kainate receptors, these compounds are few. Here we have synthesized nine novel quinoxaline-2,3-diones with substitutions in the 7-position to investigate the structure-activity relationship at kainate and α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptors. Compound 11 exhibited the highest binding affinity across GluK1-3 while having selectivity toward kainate vs AMPA receptors. Compound 11 potently inhibited glutamate evoked currents at homomeric GluK1 and GluK3 receptors in HEK293 cells with Kb values of 65 and 39 nM, respectively. The binding mode of 11 in the ligand binding domain of GluK1 was investigated by X-ray crystallography, revealing that 11 stabilizes the receptor in an open conformation, consistent with its demonstrated antagonism. Furthermore, 11 was tested for analgesic effects in the mouse tail flick test where it significantly increased tail flick latency at doses where 2,3-dioxo-6-nitro-1,2,3,4-tetrahydrobenzo[f]-quinoxaline-7-sulfonamide (NBQX) was ineffective.
U2 - 10.1021/acschemneuro.9b00479
DO - 10.1021/acschemneuro.9b00479
M3 - Journal article
C2 - 31622082
SN - 1948-7193
VL - 10
SP - 4685
EP - 4695
JO - ACS Chemical Neuroscience
JF - ACS Chemical Neuroscience
ER -