Enhancement of hippocampal synaptic AMPA receptor function by the antidepressant tianeptine and by opioid peptides.

Tianeptine enhances hippocampal AMPA receptor function via opioid receptor activation, improving glutamatergic transmission in mouse neurons.

• Why it matters: Current antidepressants often require long treatment periods and are ineffective for many patients, highlighting the need for faster, more effective options. Understanding alternative molecular targets could lead to improved therapies for major depressive disorder.
• What they did: Researchers used voltage-clamp recordings on mouse hippocampal CA1 neurons to examine how tianeptine influences AMPA receptor-mediated currents, focusing on GluA1 subunits and opioid receptor involvement.
• The result: Tianeptine increased AMPA receptor activity through opioid receptor pathways, mimicked by opioid peptides, suggesting opioids may contribute to its rapid antidepressant and procognitive effects, opening avenues for novel treatments.