The Role of Oxytocin-Driven Synaptic Plasticity in Post-Traumatic Stress Disorder:Mechanisms, Therapeutic Potential, and Future Directions

Abstract: Post-Traumatic Stress Disorder (PTSD) is a significant mental health condition characterized by persistent fear memories and emotional dysregulation, which disrupts synaptic function. Crucial neurobiological mechanisms involve impaired synaptic plasticity in key brain areas like the hippocampus, amygdala, and medial prefrontal cortex (mPFC). The neuropeptide oxytocin has gained attention for its influence on social behavior, emotional processing, and brain development. This review explores the link between oxytocin signaling and neuronal plasticity in PTSD, discussing the distribution of oxytocin receptors, molecular pathways triggered by oxytocin, and its region-specific impacts on excitatory and inhibitory neurotransmission. Both preclinical and clinical studies show that oxytocin enhances Long-Term Potentiation (LTP) in the hippocampus and reduces amygdala hyperactivity by increasing GABAergic activity. It also strengthens the connection between the mPFC and amygdala, aiding emotional regulation and fear extinction. Although intranasal oxytocin has been tested as an adjunct to exposure therapy, its effectiveness is limited by individual differences, pharmacokinetics, context sensitivity, and an incomplete understanding of underlying mechanisms. The review highlights how genetic, neuroendocrine, and neuroimaging biomarkers could be integrated into personalized treatment approaches to improve outcomes. Future directions include developing targeted delivery systems, refining oxytocin receptor agonists, and combining multimodal therapies. Overall, this review outlines the emerging role of oxytocin in modulating synaptic plasticity related to PTSD, emphasizing its therapeutic potential and significance for translational research.