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Circuit logic of oxytocin and vasopressin complementary actions
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DOI：10.3389/fnins.2026.1875731.png)
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Abstract
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Oxytocin (OT) and vasopressin (VP) are evolutionarily conserved neuropeptides that regulate social behavior; emotional processing and physiological homeostasis. Although traditionally studied as individual modulators of affiliation; stress and autonomic function; emerging evidence indicates that their actions are best understood at the level of neural circuits. Advances in optogenetics; cell-type-specific electrophysiology and systems neuroscience have revealed that OT and VP act within distributed networks through receptor-defined microcircuits composed of excitatory and inhibitory neuronal populations; astrocytes and long-range projections. Within these circuits; OT and VP can exert complementary; synergistic or opposing effects depending on receptor localization; cellular identity and network state. Here; we synthesize recent circuit-level and electrophysiological evidence to propose a framework in which OT and VP operate as a coordinated neuromodulatory axis. We argue that the functional consequences of OT/VP signaling emerge not from peptide identity alone; but from their engagement of recurrent circuit motifs that redistribute excitation and inhibition across neural networks. These motifs provide a mechanistic substrate for regulating transitions between competing behavioral and physiological states; including social safety vs. threat; affiliation vs. avoidance; and parasympathetic vs. sympathetic dominance. We further discuss how disruption of receptor topology; synaptic integration and circuit architecture may contribute to neurodevelopmental; psychiatric and stress-related disorders. By shifting the focus from peptide-centric models to circuit-level mechanisms; this framework reconciles seemingly contradictory findings across brain regions and behavioral paradigms; and provides a foundation for the development of next-generation circuit-based therapeutic strategies targeting the oxytocin-vasopressin axis.
Keywords:
psychiatry
neuromodulation
social
circuit motif
push-pull
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