Modelling vasopressin synthesis and storage dynamics during prolonged osmotic challenge and recovery based on activity dependent upregulation of mRNA transcription.

Vasopressin stores in hypothalamic neurons can sustain secretion during prolonged osmotic stress by activity-dependent mRNA regulation, acting as a long-term memory of demand.

• Why it matters: Understanding how neuroendocrine systems maintain hormone supply during extended challenges is crucial, especially without direct feedback from hormone stores, which remains poorly understood.
• What they did: A detailed neuronal model was developed, integrating spiking activity, secretion, and synthesis, to simulate vasopressin dynamics over days of osmotic stress, focusing on mRNA's role as a long-timescale memory.
• The result: The model indicates that mRNA upregulation preserves hormone supply by extending activity integration, enabling the system to balance demand and synthesis without immediate feedback from hormone stores.