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Differences in nucleus accumbens transcriptome are associated with high motivation for palatable reward in C3H/hen male mice exposed to maternal separation [nucleus accumbens]

ABSTRACT: The aim of this study was to determine the impact of early life stress on the motivation for a palatable nutritional reward in two mouse strains. Our data showed that MS associated with unpredictable chronic mild stress in lactating dams exacerbated motivation for a palatable food reward (sweetened milk) in both males and females C3H/HeN mice. Interestingly, no effect of MS was reported on motivation in C57Bl/6J mice strain. The transcriptomic analysis revealed that exacerbated motivation in MS C3H/HeN male mice was associated with marked changes in gene expressions in the NAc, whereas no significant changes were reported in PFC or hypothalamus.

ORGANISM(S): Mus musculus

PROVIDER: GSE222779 | GEO | 2023/07/24

REPOSITORIES: GEO

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Differences in nucleus accumbens transcriptome are associated with high motivation for palatable reward in C3H/hen male mice exposed to maternal separation [hypothalamus]

Project description:The aim of this study was to determine the impact of early life stress on the motivation for a palatable nutritional reward in two mouse strains. Our data showed that MS associated with unpredictable chronic mild stress in lactating dams exacerbated motivation for a palatable food reward (sweetened milk) in both males and females C3H/HeN mice. Interestingly, no effect of MS was reported on motivation in C57Bl/6J mice strain. The transcriptomic analysis revealed that exacerbated motivation in MS C3H/HeN male mice was associated with marked changes in gene expressions in the NAc, whereas no significant changes were reported in PFC or hypothalamus.

2023-07-24 | GSE222777 | GEO

Differences in nucleus accumbens transcriptome are associated with high motivation for palatable reward in C3H/hen male mice exposed to maternal separation [medial prefrontal cortex]

2023-07-24 | GSE222780 | GEO

Differences in nucleus accumbens transcriptome are associated with high motivation for palatable reward in C3H/hen male mice exposed to maternal separation [nucleus accumbens]

Project description:Differences in nucleus accumbens transcriptome are associated with high motivation for palatable reward in C3H/hen male mice exposed to maternal separation [nucleus accumbens]

| PRJNA923357 | ENA

Differences in nucleus accumbens transcriptome are associated with high motivation for palatable reward in C3H/hen male mice exposed to maternal separation

Project description:Differences in nucleus accumbens transcriptome are associated with high motivation for palatable reward in C3H/hen male mice exposed to maternal separation

| PRJNA923354 | ENA

Differences in nucleus accumbens transcriptome are associated with high motivation for palatable reward in C3H/hen male mice exposed to maternal separation [hypothalamus]

Project description:Differences in nucleus accumbens transcriptome are associated with high motivation for palatable reward in C3H/hen male mice exposed to maternal separation [hypothalamus]

| PRJNA923351 | ENA

Differences in nucleus accumbens transcriptome are associated with high motivation for palatable reward in C3H/hen male mice exposed to maternal separation [medial prefrontal cortex]

Project description:Differences in nucleus accumbens transcriptome are associated with high motivation for palatable reward in C3H/hen male mice exposed to maternal separation [medial prefrontal cortex]

| PRJNA923358 | ENA

Distinct reward processing by subregions of the nucleus accumbens

Project description:The nucleus accumbens (NAc) plays an important role in motivation and reward processing. Recent studies suggest that different NAc subnuclei differentially contribute to reward-related behaviors. However, how reward is encoded in individual NAc neurons remains unclear. Using in vivo single-cell resolution calcium imaging, we discovered diverse patterns of reward encoding in the medial and lateral shell subdivision of the NAc (NAcMed and NAcLat, respectively). Reward consumption increases NAcLat activity but decreases NAcMed activity, albeit with high variability among neurons. The heterogeneity in reward encoding could be attributed to differences in their synaptic inputs and transcriptional profiles. Specific optogenetic activation of Nts-positive neurons in the NAcLat promotes positive reinforcement, while activation of Cartpt-positive neurons in the NAcMed induces behaviour aversion. Collectively, our study reveals organizational and transcriptional differences in NAc subregions, and provides a framework for future dissection of NAc subregions in physiological and pathological conditions.

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Chronic stress deficits in reward behaviour co-occur with low nucleus accumbens dopamine activity during reward anticipation specifically

Project description:Whilst reward pathologies e.g., anhedonia and apathy, are major and common in stress-related neuropsychiatric disorders, their neurobiological bases and therefore treatment are poorly understood. Functional imaging studies in humans with reward pathology indicate that attenuated BOLD activity in nucleus accumbens (NAc) occurs during reward anticipation/expectancy but not reinforcement; potentially, this is dopamine (DA) related. In mice, chronic social stress (CSS) leads to reduced reward learning and effortful motivation and, here, DA-sensor fibre photometry was used to investigate whether these behavioural deficits co-occur with altered NAc DA activity during reward anticipation and/or reinforcement. In CSS mice relative to controls: (1) Reduced discriminative learning of the sequence, tone-on + appetitive behaviour = tone-on + sucrose reinforcement, co-occurred with attenuated NAc DA activity throughout tone-on and sucrose reinforcement. (2) Reduced effortful motivation during the sequence, operant behaviour = tone-on + sucrose delivery + tone-off / appetitive behaviour = sucrose reinforcement, co-occurred with attenuated NAc DA activity at tone-on and typical activity at sucrose reinforcement. (3) Reduced effortful motivation during the sequence, operant behaviour = appetitive behaviour + sociosexual reinforcement co-occurred with typical NAc DA activity at female reinforcement. Therefore, in CSS mice attenuated NAc DA activity is specific to reward anticipation and as such potentially causal to deficits in learning and motivation. CSS did not impact on the transcriptome of ventral tegmentum DA neurons, suggesting that its stimulus-specific effects on NAc DA activity originate elsewhere in the neural circuitry of reward processing.

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Project description:The nucleus accumbens plays a central role in ther regulation of reward, emotion, motivation and goal-directed behavior. Gene expression impairments in this brain region are of crucial interest to understand the neurobiological underpinnings of heroin use disorder. We used the Affymetrix HG-U133A microarray to assess gene expression in the post-mortem nucleus accumbens of human heroin users and control subjects and identified differentially expressed genes.

2016-10-12 | GSE87823 | GEO

Sex differences in the ventral tegmental area and nucleus accumbens proteome at baseline and following nicotine exposure

Project description:Sex differences in behaviors relevant to nicotine addiction have been observed in rodent models and human subjects. Behavioral, imaging and epidemiological studies also suggest underlying sex differences in mesolimbic dopamine signaling pathways. In this study we evaluated the proteome in the ventral tegmental area (VTA) and nucleus accumbens (NAc) shell in male and female mice. Experimental groups included two mouse strains (C3H/HeJ and C57BL/6J) at baseline, a sub-chronic, rewarding regimen of nicotine in C3H/HeJ mice, and chronic nicotine administration and withdrawal in C57BL/6J mice. Isobaric labeling with a TMT 10-plex system, sample fractionation, and tandem mass spectrometry were used to quantify changes in protein abundance. Similar or greater numbers of differentially regulated proteins were found between sexes at baseline in C3H/HeJ or C57BL/6J mice than within sexes following their respective regimen of nicotine administration. Despite differences by sex, strain, and nicotine exposure parameters, glial fibrillary acidic protein (GFAP) and dopamine and cAMP-regulated phosphoprotein of 32 kDa (DARPP-32, Ppp1r1b) were repeatedly identified as significantly altered proteins, especially in the VTA. Further, network analyses showed sex- and nicotine-dependent regulation of a number of signaling pathways, including dopaminergic signaling. Sub-chronic nicotine exposure in female mice increased proteins related to dopaminergic signaling in the NAc shell but decreased them in the VTA, whereas the opposite pattern was observed in male mice. In contrast, dopaminergic signaling pathways were similarly upregulated in both male and female VTA after chronic nicotine and withdrawal. Overall, this study identifies significant sex differences in the proteome of the mesolimbic system, at baseline and after nicotine reward or withdrawal, which may help explain differential trajectories and susceptibility to nicotine addiction in males and females.

2021-06-28 | PXD023859 | Pride

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