Unknown,Transcriptomics,Genomics,Proteomics

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Transcription profiling of mouse mammary gland gene expression and tumor growth following chronic social isolation

ABSTRACT: Clinical studies have revealed that social support improves the outcome of cancer patients while epidemiological studies suggest that social isolation increases the risk of death associated with several chronic diseases. However, the precise biological consequences of an unfavorable social environment have not been defined. To do so, robust, reproducible pre-clinical models are needed to study the mechanisms whereby an adverse environment impacts on gene expression and cancer biology. Because random assignment of inbred laboratory mice to well-defined social environments allows accurate and repeated measurements of behavioral and endocrine parameters, transgenic mice provide a pre-clinical framework with which to begin to determine gene-environment mechanisms. In this study, we found that female C3(1)/SV40 T-antigen mice deprived of social interaction from weaning exhibited increased expression of genes encoding key metabolic pathway enzymes in the pre-malignant mammary gland. Chronic social isolation was associated with upregulated fatty acid synthesis and glycolytic pathway gene expression - both pathways known to contribute to increased breast cancer growth. Consistent with the expression of metabolic genes, isolated mice subsequently developed significantly larger mammary gland tumors compared to group-housed mice. Endocrine evaluation confirmed that isolated mice developed a heightened corticosterone stress response compared to group-housed mice. Together, these transdisciplinary studies show for the first time that an adverse social environment is associated with altered mammary gland gene expression and tumor growth. Moreover, the identification of specific alterations in metabolic pathways favoring tumor growth suggests potential molecular biomarkers and/or targets (e.g. fatty acid synthesis) for preventive intervention in breast cancer. Experiment Overall Design: SV40 Tag mice we isolated or grouped at weaning. Mouse mammary glands were rapidly excised at necropsy and immediatley flash frozen to detect difference in gene expression between thoraci MG from isolated versus group-housed female mice.

ORGANISM(S): Mus musculus

SUBMITTER: Suzanne Conzen

PROVIDER: E-GEOD-16110 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:Adolescence is a critical period in cognitive and emotional development, characterized by high levels of social interaction and increases in risk-taking behavior including binge drinking. Adolescent exposure to social stress and binge ethanol have individually been associated with the development of social, emotional, and cognitive deficits, as well as increased risk for alcohol use disorder. Disruption of cortical development by early life social stress and/or binge drinking may partly underlie these enduring emotional, cognitive, and behavioral effects. The study goal is to implement a novel neighbor housing environment to identify the effects of adolescent neighbor housing and/or binge ethanol drinking on (1) a battery of emotional and cognitive tasks (2) adult ethanol drinking behavior, and (3) the nucleus accumbens and prefrontal cortex transcriptome. Adolescent male and female C57BL/6J mice were single or neighbor housed with or without access to intermittent ethanol. One cohort underwent behavioral testing during adulthood to determine social preference, expression of anxiety-like behavior, cognitive performance, and patterns of ethanol intake. The second cohort was sacrificed in late adolescence and brain tissue was used for transcriptomics analysis. As adults, single housed mice displayed decreased social interaction, deficits in the novel object recognition task, and increased anxiety-like behavior, relative to neighbor-housed mice. There was no effect of housing condition on adolescent or adult ethanol consumption. Adolescent ethanol exposure did not alter adult ethanol intake. Transcriptomics analysis revealed that adolescent housing condition and ethanol exposure resulted in differential expression of genes related to synaptic plasticity in the nucleus accumbens and genes related to methylation, the extracellular matrix and inflammation in the prefrontal cortex. The behavioral results indicate that social interaction during adolescence via the neighbor housing model may protect against emotional, social, and cognitive deficits. In addition, the transcriptomics results suggest that these behavioral alterations may be mediated in part by dysregulation of transcription in the frontal cortex or the nucleus accumbens

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Transcription profiling of mouse mammary gland gene expression and tumor growth following chronic social isolation

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