Background
Social memory—the ability to recognize familiar individuals and distinguish them from strangers—is fundamental to social cognition. Deficits in social memory are hallmarks of multiple neuropsychiatric and neurodegenerative disorders, including autism spectrum disorder (ASD), posttraumatic stress disorder (PTSD), and Alzheimer’s disease (AD). In particular, these conditions often coexist with chronic sleep disorders. Although there is extensive evidence linking sleep disturbance to impaired social cognition, the underlying circuit-level and neurochemical mechanisms have remained largely unresolved.
Research progress
To address these challenges, the research team led by Prof. Haibo Xu and Prof. Linlin Bi at Wuhan University used a combination of high-resolution oxytocin sensor imaging (OXT), optogenetics, calcium imaging, and electrophysiological approaches to reveal the neural circuit mechanisms underlying sleep intervention dynamics as well as social memory.
The study found that chronic sleep disruption persistently impairs social memory.
OXT release is differentially encoded in hippocampal CA2 during social novelty encoding and in the prefrontal cortex (PrL) during familiarity retrieval. PVNOXT-CA2 and PVNOXT-PrL—respectively govern encoding and retrieval of social memory; High-frequency (100 Hz) stimulation of PVNOXT neurons restores neuronal excitability, enhances OXT release, and produces sustained behavioral recovery.
Future prospects
This work provides causal evidence linking sleep disturbance, oxytocin signaling, and social memory circuits. Importantly, it highlights restoration of the neuronal source of oxytocin as a more effective strategy than downstream circuit modulation alone. The findings offer a conceptual and experimental framework for developing neuromodulation-based therapies, optimizing oxytocin-related interventions, and advancing precision medicine approaches to social cognitive dysfunction associated with sleep disorders.
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