Social Stress Drives Sex-Specific Molecular Changes in Female Reward Circuitry

Major depressive disorder remains a leading cause of global disability, yet the biological heterogeneity between sexes often complicates effective treatment selection. Chronic psychosocial stress is a well-established risk factor for psychiatric conditions, frequently manifesting as structural alterations such as gray matter atrophy in the prefrontal cortex and persistent neuroinflammatory responses involving elevated microglial activity [1, 2, 3]. While social defeat increases the risk of suicide and poor functional outcomes, with childhood maltreatment associated with a two- to three-fold increased risk for suicide attempts, the specific cellular adaptations driving these behaviors are often studied through a male-centric lens [4, 5]. Environmental factors, including rising income inequality (pooled risk ratio 1.19; 95% CI: 1.07 to 1.31) and childhood abuse, disproportionately affect the mental health trajectories of women [6, 4]. A new study now investigates the cell-specific translatome (the pool of messenger RNA molecules being actively translated into proteins) within the reward circuitry to clarify how female-specific molecular signatures, such as the 630 differentially expressed genes identified in adenosine 2a receptor-enriched neurons, contribute to stress-induced pathology [7].