6-Chloro-3'-nitroflavone is a potent ligand for the benzodiazepine binding site of the GABA(A) receptor devoid of intrinsic activity
6-Chloro-3'-nitroflavone integrates a list of nearly 70 flavone derivatives synthesized in our laboratories. The effects of 6-chloro-3'- nitroflavone on the benzodiazepine binding sites (BDZ-BSs) of the GABA(A) receptor were examined in vitro and in vivo. 6-Chloro-3'-nitroflavone inhi...
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todo:paper_00913057_v65_n2_p313_Viola2023-10-03T14:54:57Z 6-Chloro-3'-nitroflavone is a potent ligand for the benzodiazepine binding site of the GABA(A) receptor devoid of intrinsic activity Viola, H. Wolfman, C. Marder, M. Goutman, J.D. Bianchin, M. Wasowski, C. Calvo, D.J. Izquierdo, I. Paladini, A.C. Medina, J.H. Antagonist Benzodiazepine binding site of the GABA(A) receptor Flavonoids 6 chloro 3' nitroflavone flavone derivative nitrazepam unclassified drug animal experiment animal model article binding site brain membrane controlled study drug potency drug receptor binding electrophysiology intrinsic sympathomimetic activity ligand binding motor coordination nonhuman priority journal rat receptor affinity voltage clamp 6-Chloro-3'-nitroflavone integrates a list of nearly 70 flavone derivatives synthesized in our laboratories. The effects of 6-chloro-3'- nitroflavone on the benzodiazepine binding sites (BDZ-BSs) of the GABA(A) receptor were examined in vitro and in vivo. 6-Chloro-3'-nitroflavone inhibited the [3H]flunitrazepam ([3H]FNZ) binding to rat cerebral cortex membranes with a K(i) of 6.68 nM and the addition of GABA to extensively washed membranes did not modify its affinity for the BDZ-BSs (GABA-shift = 1. 16 ± 0.12). The binding assays performed in rat striatal and cerebellar brain membranes showed that this compound has similar affinity to different populations of BDZ-BSs. Electrophysiological experiments revealed that 6- chloro-3'-nitroflavone did not affect GABA(A)-receptors (GABA(A)-Rs) responses recorded in Xenopus oocytes expressing α1β2γ(2s) subunits, but blocked the potentiation exerted by diazepam (DZ) on GABA-activated chloride currents. In vivo experiments showed that 6-chloro-3'-nitroflavone did not possess anxiolytic, anticonvulsant, sedative, myorelaxant actions in mice or amnestic effects in rats; however, 6-chloro-3'-nitroflavone antagonized diazepam-induced antianxiety action, anticonvulsion, short-term, and long- term amnesia and motor incoordination. These biochemical, electrophysiological, and pharmacological results suggest that 6-chloro-3'- nitroflavone behaves as an antagonist of the BDZ-BSs. (C) 2000 Elsevier Science Inc. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00913057_v65_n2_p313_Viola |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Antagonist Benzodiazepine binding site of the GABA(A) receptor Flavonoids 6 chloro 3' nitroflavone flavone derivative nitrazepam unclassified drug animal experiment animal model article binding site brain membrane controlled study drug potency drug receptor binding electrophysiology intrinsic sympathomimetic activity ligand binding motor coordination nonhuman priority journal rat receptor affinity voltage clamp |
| spellingShingle |
Antagonist Benzodiazepine binding site of the GABA(A) receptor Flavonoids 6 chloro 3' nitroflavone flavone derivative nitrazepam unclassified drug animal experiment animal model article binding site brain membrane controlled study drug potency drug receptor binding electrophysiology intrinsic sympathomimetic activity ligand binding motor coordination nonhuman priority journal rat receptor affinity voltage clamp Viola, H. Wolfman, C. Marder, M. Goutman, J.D. Bianchin, M. Wasowski, C. Calvo, D.J. Izquierdo, I. Paladini, A.C. Medina, J.H. 6-Chloro-3'-nitroflavone is a potent ligand for the benzodiazepine binding site of the GABA(A) receptor devoid of intrinsic activity |
| topic_facet |
Antagonist Benzodiazepine binding site of the GABA(A) receptor Flavonoids 6 chloro 3' nitroflavone flavone derivative nitrazepam unclassified drug animal experiment animal model article binding site brain membrane controlled study drug potency drug receptor binding electrophysiology intrinsic sympathomimetic activity ligand binding motor coordination nonhuman priority journal rat receptor affinity voltage clamp |
| description |
6-Chloro-3'-nitroflavone integrates a list of nearly 70 flavone derivatives synthesized in our laboratories. The effects of 6-chloro-3'- nitroflavone on the benzodiazepine binding sites (BDZ-BSs) of the GABA(A) receptor were examined in vitro and in vivo. 6-Chloro-3'-nitroflavone inhibited the [3H]flunitrazepam ([3H]FNZ) binding to rat cerebral cortex membranes with a K(i) of 6.68 nM and the addition of GABA to extensively washed membranes did not modify its affinity for the BDZ-BSs (GABA-shift = 1. 16 ± 0.12). The binding assays performed in rat striatal and cerebellar brain membranes showed that this compound has similar affinity to different populations of BDZ-BSs. Electrophysiological experiments revealed that 6- chloro-3'-nitroflavone did not affect GABA(A)-receptors (GABA(A)-Rs) responses recorded in Xenopus oocytes expressing α1β2γ(2s) subunits, but blocked the potentiation exerted by diazepam (DZ) on GABA-activated chloride currents. In vivo experiments showed that 6-chloro-3'-nitroflavone did not possess anxiolytic, anticonvulsant, sedative, myorelaxant actions in mice or amnestic effects in rats; however, 6-chloro-3'-nitroflavone antagonized diazepam-induced antianxiety action, anticonvulsion, short-term, and long- term amnesia and motor incoordination. These biochemical, electrophysiological, and pharmacological results suggest that 6-chloro-3'- nitroflavone behaves as an antagonist of the BDZ-BSs. (C) 2000 Elsevier Science Inc. |
| format |
JOUR |
| author |
Viola, H. Wolfman, C. Marder, M. Goutman, J.D. Bianchin, M. Wasowski, C. Calvo, D.J. Izquierdo, I. Paladini, A.C. Medina, J.H. |
| author_facet |
Viola, H. Wolfman, C. Marder, M. Goutman, J.D. Bianchin, M. Wasowski, C. Calvo, D.J. Izquierdo, I. Paladini, A.C. Medina, J.H. |
| author_sort |
Viola, H. |
| title |
6-Chloro-3'-nitroflavone is a potent ligand for the benzodiazepine binding site of the GABA(A) receptor devoid of intrinsic activity |
| title_short |
6-Chloro-3'-nitroflavone is a potent ligand for the benzodiazepine binding site of the GABA(A) receptor devoid of intrinsic activity |
| title_full |
6-Chloro-3'-nitroflavone is a potent ligand for the benzodiazepine binding site of the GABA(A) receptor devoid of intrinsic activity |
| title_fullStr |
6-Chloro-3'-nitroflavone is a potent ligand for the benzodiazepine binding site of the GABA(A) receptor devoid of intrinsic activity |
| title_full_unstemmed |
6-Chloro-3'-nitroflavone is a potent ligand for the benzodiazepine binding site of the GABA(A) receptor devoid of intrinsic activity |
| title_sort |
6-chloro-3'-nitroflavone is a potent ligand for the benzodiazepine binding site of the gaba(a) receptor devoid of intrinsic activity |
| url |
http://hdl.handle.net/20.500.12110/paper_00913057_v65_n2_p313_Viola |
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