Reduced Chrna7 expression in C3H mice is associated with increases in hippocampal parvalbumin and glutamate decarboxylase-67 (GAD67) as well as altered levels of GABAA receptor subunits

Bates, Ryan; Stith, Bradley J.; Stevens, Karen E.; Adams, Catherine E.

doi:10.1016/j.neuroscience.2014.05.004

Cited by 12 publications

(10 citation statements)

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“…If not cell autonomous, it is possible hippocampal interneurons expressing α7 nAChRs (Jones and Yakel 1997), could be responsible for the changes we observed. Recent studies show that loss of α7 nAChRs can change cell composition in the hippocampus, causing an increase in parvalbumin + interneurons in C3H mice (Bates et al 2014), or an overall decrease in interneurons in the hippocampus (Adams et al 2012). Parvalbumin + interneurons in the subgranular zone act to inhibit neurogenesis through spill-over of GABA (Song et al 2012).…”

Section: Discussionmentioning

confidence: 99%

The α7 nicotinic acetylcholine receptors regulate hippocampal adult-neurogenesis in a sexually dimorphic fashion

Otto

Yakel

2018

Brain Struct Funct

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Disruption in cholinergic signaling has been linked to many environmental and/or pathological conditions known to modify adult neurogenesis. The α7 nAChRs are in the family of cys-loop receptor channels which have been shown to be neuroprotective in adult neurons and are thought to be critical for survival and integration of immature neurons. However, in developing neurons, poor calcium buffering may cause α7 nAChR activation to be neurotoxic. To investigate whether the α7 nAChR regulates neurogenesis in the hippocampus, we used a combination of mouse genetics and imaging to quantify neural stem cell (NSC) densities located in the dentate gyrus of adult mice. In addition, we considered whether the loss of α7 nAChRs had functional consequences on a spatial discrimination task that is thought to rely on pattern separation mechanisms. We found that the loss of α7 nAChRs resulted in increased neurogenesis in male mice only, while female mice showed increased cell divisions and intermediate progenitors but no change in neurogenesis. Knocking out the α7 nAChR from nestin+ NSCs and their progeny showed signaling in these cells contributes to regulating neurogenesis. In addition, male, but not female, mice lacking α7 nAChRs performed significantly worse in the spatial discrimination task. This task was sexually dimorphic in wild-type mice, but not in the absence of α7 nAChRs. We conclude that α7 nAChRs regulate adult neurogenesis and impact spatial discrimination function in male, but not female mice, via a mechanism involving nestin+ NSCs and their progeny.

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Section: Discussionmentioning

confidence: 99%

The α7 nicotinic acetylcholine receptors regulate hippocampal adult-neurogenesis in a sexually dimorphic fashion

Otto

Yakel

2018

Brain Struct Funct

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“…The deletion comprises six genes including two genes for receptors, TRPM1 and CHRNA7 (37), and has been functionally implicated in the expression of inhibitory markers (38). A mouse model of this mutation recapitulates abnormalities in oscillatory and evoked activity seen in EEG studies of SCZ patients.…”

Section: Introductionmentioning

confidence: 99%

Electrophysiological Endophenotypes in Rodent Models of Schizophrenia and Psychosis

Rosen

Spellman

Gordon

2015

Biological Psychiatry

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Schizophrenia is caused by a diverse array of risk factors, and results in a similarly diverse set of symptoms. Electrophysiological endophenotypes lie between risks and symptoms, and have the potential to link the two. Electrophysiological studies in rodent models, described here, demonstrate that widely differing risk factors result in a similar set of core electrophysiological endophenotypes, suggesting the possibility of a shared neurobiological substrate.

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“…Acetylcholine Dopaminergic neurons, GABAergic interneurons, and pyramidal neurons (Bates et al, 2014).…”

Section: Adra2cmentioning

confidence: 99%

Attention-deficit/hyperactive disorder updates

Kessi

Duan

Xiong

et al. 2022

Front. Mol. Neurosci.

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BackgroundAttention-deficit/hyperactive disorder (ADHD) is a neurodevelopmental disorder that commonly occurs in children with a prevalence ranging from 3.4 to 7.2%. It profoundly affects academic achievement, well-being, and social interactions. As a result, this disorder is of high cost to both individuals and society. Despite the availability of knowledge regarding the mechanisms of ADHD, the pathogenesis is not clear, hence, the existence of many challenges especially in making correct early diagnosis and provision of accurate management.ObjectivesWe aimed to review the pathogenic pathways of ADHD in children. The major focus was to provide an update on the reported etiologies in humans, animal models, modulators, therapies, mechanisms, epigenetic changes, and the interaction between genetic and environmental factors.MethodsReferences for this review were identified through a systematic search in PubMed by using special keywords for all years until January 2022.ResultsSeveral genes have been reported to associate with ADHD: DRD1, DRD2, DRD4, DAT1, TPH2, HTR1A, HTR1B, SLC6A4, HTR2A, DBH, NET1, ADRA2A, ADRA2C, CHRNA4, CHRNA7, GAD1, GRM1, GRM5, GRM7, GRM8, TARBP1, ADGRL3, FGF1, MAOA, BDNF, SNAP25, STX1A, ATXN7, and SORCS2. Some of these genes have evidence both from human beings and animal models, while others have evidence in either humans or animal models only. Notably, most of these animal models are knockout and do not generate the genetic alteration of the patients. Besides, some of the gene polymorphisms reported differ according to the ethnic groups. The majority of the available animal models are related to the dopaminergic pathway. Epigenetic changes including SUMOylation, methylation, and acetylation have been reported in genes related to the dopaminergic pathway.ConclusionThe dopaminergic pathway remains to be crucial in the pathogenesis of ADHD. It can be affected by environmental factors and other pathways. Nevertheless, it is still unclear how environmental factors relate to all neurotransmitter pathways; thus, more studies are needed. Although several genes have been related to ADHD, there are few animal model studies on the majority of the genes, and they do not generate the genetic alteration of the patients. More animal models and epigenetic studies are required.

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Reduced Chrna7 expression in C3H mice is associated with increases in hippocampal parvalbumin and glutamate decarboxylase-67 (GAD67) as well as altered levels of GABAA receptor subunits

Cited by 12 publications

References 82 publications

The α7 nicotinic acetylcholine receptors regulate hippocampal adult-neurogenesis in a sexually dimorphic fashion

The α7 nicotinic acetylcholine receptors regulate hippocampal adult-neurogenesis in a sexually dimorphic fashion

Electrophysiological Endophenotypes in Rodent Models of Schizophrenia and Psychosis

Attention-deficit/hyperactive disorder updates

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