Subregion-specific transcriptomic profiling of rat brain reveals sex-distinct gene expression impacted by adolescent stress

• Published in: Neuroscience Vol. 553; pp. 19 - 39
• Main Authors: Krolick, Kristen N., Cao, Jingyi, Gulla, Evelyn M., Bhardwaj, Meeta, Marshall, Samantha J., Zhou, Ethan Y., Kiss, Andor J., Choueiry, Fouad, Zhu, Jiangjiang, Shi, Haifei
• Format: Journal Article
• Language: English
• Published: United States Elsevier Inc 16.08.2024
• Subjects: Amygdala; Animals; Brain - metabolism; Chronic restraint stress; Corticosterone - blood; Female; Gene Expression Profiling; Hippocampus; Hypothalamus; Male; Orbitofrontal cortex; Prefrontal Cortex - metabolism; Rats; Rats, Sprague-Dawley; Sex Characteristics; Sex-specific differences; Stress, Psychological - metabolism; Transcriptome; Orbitofrontal cortex; Sex-specific differences; Hypothalamus; Chronic restraint stress; Amygdala; Hippocampus
• ISSN: 0306-4522; 1873-7544; 1873-7544
• DOI: 10.1016/j.neuroscience.2024.07.002

•Sex-distinct responses to chronic restraint stress were shown in adolescent rats.•Stress persistently lowered body mass of male rats that continued into adulthood.•Stress temporarily reduced lean mass and delayed fat mass decrease in female rats.•Males sustained, but females abolished, HPA stress response measured by CORT levels.•RNA-Seq revealed sex-distinct genes in adolescent male and female brain subregions. Stress during adolescence clearly impacts brain development and function. Sex differences in adolescent stress-induced or exacerbated emotional and metabolic vulnerabilities could be due to sex-distinct gene expression in hypothalamic, limbic, and prefrontal brain regions. However, adolescent stress-induced whole-genome expression changes in key subregions of these brain regions were unclear. In this study, female and male adolescent Sprague Dawley rats received one-hour restraint stress daily from postnatal day (PD) 32 to PD44. Corticosterone levels, body weights, food intake, body composition, and circulating adiposity and sex hormones were measured. On PD44, brain and blood samples were collected. Using RNA-sequencing, sex-specific differences in stress-induced differentially expressed (DE) genes were identified in subregions of the hypothalamus, limbic system, and prefrontal cortex. Canonical pathways reflected well-known sex-distinct maladies and diseases, substantiating the therapeutic potential of the DE genes found in the current study. Thus, we proposed specific sex distinct, adolescent stress-induced transcriptional changes found in the current study as examples of the molecular bases for sex differences witnessed in stress induced or exacerbated emotional and metabolic disorders. Future behavioral studies and single-cell studies are warranted to test the implications of the DE genes identified in this study in sex-distinct stress-induced susceptibilities.