GABAA receptor subtypes in the mouse brain: Regional mapping and diazepam receptor occupancy by in vivo [18F]flumazenil PET
Classical benzodiazepines, which are widely used as sedatives, anxiolytics and anticonvulsants, exert their therapeutic effects through interactions with heteropentameric GABAA receptors composed of two α, two β and one γ2 subunit. Their high affinity binding site is located at the interface between...
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Published in | NeuroImage (Orlando, Fla.) Vol. 150; pp. 279 - 291 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
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15.04.2017
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Abstract | Classical benzodiazepines, which are widely used as sedatives, anxiolytics and anticonvulsants, exert their therapeutic effects through interactions with heteropentameric GABAA receptors composed of two α, two β and one γ2 subunit. Their high affinity binding site is located at the interface between the γ2 and the adjacent α subunit. The α-subunit gene family consists of six members and receptors can be homomeric or mixed with respect to the α-subunits. Previous work has suggested that benzodiazepine binding site ligands with selectivity for individual GABAA receptor subtypes, as defined by the benzodiazepine-binding α subunit, may have fewer side effects and may even be effective in diseases, such as schizophrenia, autism or chronic pain, that do not respond well to classical benzodiazepines. The distributions of the individual α subunits across the CNS have been extensively characterized. However, as GABAA receptors may contain two different α subunits, the distribution of the subunits does not necessarily reflect the distribution of receptor subtypes with respect to benzodiazepine pharmacology. In the present study, we have used in vivo [18F]flumazenil PET and in vitro [3H]flumazenil autoradiography in combination with GABAA receptor point-mutated mice to characterize the distribution of the two most prevalent GABAA receptor subtypes (α1 and α2) throughout the mouse brain. The results were in agreement with published in vitro data. High levels of α2-containing receptors were found in brain regions of the neuronal network of anxiety. The α1/α2 subunit combinations were predictable from the individual subunit levels. In additional experiments, we explored in vivo [18F]flumazenil PET to determine the degree of receptor occupancy at GABAA receptor subtypes following oral administration of diazepam. The dose to occupy 50% of sensitive receptors, independent of the receptor subtype(s), was 1–2mg/kg, in agreement with published data from ex vivo studies with wild type mice. In conclusion, we have resolved the quantitative distribution of α1- and α2-containing homomeric and mixed GABAA receptors in vivo at the millimeter scale and demonstrate that the regional drug receptor occupancy in vivo at these GABAA receptor subtypes can be determined by [18F]flumazenil PET. Such information should be valuable for drug development programs aiming for subtype-selective benzodiazepine site ligands for new therapeutic indications.
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•[18F]Flumazenil PET with point-mutated mice to predict GABAA receptor pharmacology.•Mapping of homomeric and mixed α1 and α2 GABAA receptors in vivo in mouse brain.•In vivo regional GABAA receptor occupancy in mouse brain by [18F]flumazenil PET. |
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AbstractList | Classical benzodiazepines, which are widely used as sedatives, anxiolytics and anticonvulsants, exert their therapeutic effects through interactions with heteropentameric GABAA receptors composed of two α, two β and one γ2 subunit. Their high affinity binding site is located at the interface between the γ2 and the adjacent α subunit. The α-subunit gene family consists of six members and receptors can be homomeric or mixed with respect to the α-subunits. Previous work has suggested that benzodiazepine binding site ligands with selectivity for individual GABAA receptor subtypes, as defined by the benzodiazepine-binding α subunit, may have fewer side effects and may even be effective in diseases, such as schizophrenia, autism or chronic pain, that do not respond well to classical benzodiazepines. The distributions of the individual α subunits across the CNS have been extensively characterized. However, as GABAA receptors may contain two different α subunits, the distribution of the subunits does not necessarily reflect the distribution of receptor subtypes with respect to benzodiazepine pharmacology. In the present study, we have used in vivo [18F]flumazenil PET and in vitro [3H]flumazenil autoradiography in combination with GABAA receptor point-mutated mice to characterize the distribution of the two most prevalent GABAA receptor subtypes (α1 and α2) throughout the mouse brain. The results were in agreement with published in vitro data. High levels of α2-containing receptors were found in brain regions of the neuronal network of anxiety. The α1/α2 subunit combinations were predictable from the individual subunit levels. In additional experiments, we explored in vivo [18F]flumazenil PET to determine the degree of receptor occupancy at GABAA receptor subtypes following oral administration of diazepam. The dose to occupy 50% of sensitive receptors, independent of the receptor subtype(s), was 1–2mg/kg, in agreement with published data from ex vivo studies with wild type mice. In conclusion, we have resolved the quantitative distribution of α1- and α2-containing homomeric and mixed GABAA receptors in vivo at the millimeter scale and demonstrate that the regional drug receptor occupancy in vivo at these GABAA receptor subtypes can be determined by [18F]flumazenil PET. Such information should be valuable for drug development programs aiming for subtype-selective benzodiazepine site ligands for new therapeutic indications.
[Display omitted]
•[18F]Flumazenil PET with point-mutated mice to predict GABAA receptor pharmacology.•Mapping of homomeric and mixed α1 and α2 GABAA receptors in vivo in mouse brain.•In vivo regional GABAA receptor occupancy in mouse brain by [18F]flumazenil PET. |
Author | Mu, Linjing Ralvenius, William T. Benke, Dietmar Müller Herde, Adrienne Schibli, Roger Zeilhofer, Hanns Ulrich Krämer, Stefanie D. |
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CitedBy_id | crossref_primary_10_1016_j_neuroimage_2018_06_009 crossref_primary_10_3390_ijms232012617 crossref_primary_10_1016_j_nucmedbio_2020_07_005 crossref_primary_10_3390_brainsci13030408 crossref_primary_10_1002_cbdv_202302122 crossref_primary_10_1016_j_neuint_2022_105303 crossref_primary_10_3390_plants12081675 crossref_primary_10_1038_s42003_022_03268_1 crossref_primary_10_1021_acs_jmedchem_0c01714 crossref_primary_10_1124_pr_117_014449 crossref_primary_10_1523_JNEUROSCI_2880_19_2020 crossref_primary_10_3390_ph16050764 crossref_primary_10_3390_ph16030417 crossref_primary_10_1080_14737175_2018_1413353 crossref_primary_10_1093_cercor_bhad522 |
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