Immunohistochemical distribution of 10 GABAA receptor subunits in the forebrain of the rhesus monkey Macaca mulatta.
J Comp Neurol
; 528(15): 2551-2568, 2020 10 15.
Article
in En
| MEDLINE
| ID: mdl-32220012
ABSTRACT
GABAA receptors are composed of five subunits arranged around a central chloride channel. Their subunits originate from different genes or gene families. The majority of GABAA receptors in the mammalian brain consist of two α-, two ß- and one γ- or δ-subunit. This subunit organization crucially determines the physiological and pharmacological properties of the GABAA receptors. Using immunohistochemistry, we investigated the distribution of 10 GABAA receptor subunits (α1, α2, α3, α4, α5, ß1, ß2, ß3, γ2, and δ) in the fore brain of three female rhesus monkeys (Macaca mulatta). Within the cerebral cortex, subunits α1, α5, ß2, ß3, and γ2 were found in all layers, α2, α3, and ß1 were more concentrated in the inner and outer layers. The caudate/putamen was rich in α1, α2, α5, all three ß-subunits, γ2, and δ. Subunits α3 and α5 were more concentrated in the caudate than in the putamen. In contrast, α1, α2, ß1, ß2, γ2, and δ were highest in the pallidum. Most dorsal thalamic nuclei contained subunits α1, α2, α4, ß2, ß3, and γ2, whereas α1, α3, ß1, and γ2 were most abundant in the reticular nucleus. Within the amygdala, subunits α1, α2, α5, ß1, ß3, γ2, and δ were concentrated in the cortical nucleus, whereas in the lateral and basolateral amygdala α1, α2, α5, ß1, ß3, and δ, and in the central amygdala α1, α2, ß3, and γ2 were most abundant. Interestingly, subunit α3-IR outlined the intercalated nuclei of the amygdala. In the hippocampus, subunits α1, α2, α5, ß2, ß3, γ2, and δ were highly expressed in the dentate molecular layer, whereas α1, α2, α3, α5, ß1, ß2, ß3, and γ2 were concentrated in sector CA1 and the subiculum. The distribution of GABAA receptor subunits in the rhesus monkey was highly heterogeneous indicating a high number of differently assembled receptors. In most areas investigated, notably in the striatum/pallidum, amygdaloid nuclei and in the hippocampus it was more diverse than in the rat and mouse indicating a more heterogeneous and less defined receptor assembly in the monkey than in rodent brain.
Key words
GABAA receptor subunits; RRID:AB_2108828; ab GAD67, RRID:AB_2278725; ab NeuN, RRID:AB_2278725; ab α2, RRID:AB_2827793; ab α3, RRID:AB_2827797; ab α4, RRID:AB_2827798; ab α5, RRID:AB_2827799; ab ß1, RRID:AB_2827800; ab ß2, RRID:AB_2827801; ab ß3, RRID:AB_2827802; ab γ2, RRID:AB_2827803; ab δ, RRID:AB_2827804; amygdala; antibody α1 (BD24); basal ganglia; benzodiazepine; goat biotinylated anti-rabbit ab, RRID:AB_2336810; horse anti-mouse ab, RRID:AB_2336811; immunohistochemistry; monkey; primate; thalamus
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Prosencephalon
/
Receptors, GABA-A
/
Protein Subunits
Limits:
Animals
Language:
En
Journal:
J Comp Neurol
Year:
2020
Type:
Article
Affiliation country:
Austria