Editorial: Retuning the Adolescent Brain: Esketamine and Rapid Structural Change in the rACC.
Abstract
Adolescent major depressive disorder (MDD) is a leading cause of disability worldwide and a major, modifiable risk factor for suicide, which remains the second leading cause of death in this age group.<sup>1</sup> For 30% to 50% of patients who fail to achieve remission despite multiple treatment steps, the clinical and psychosocial consequences are substantial.<sup>2</sup> Although selective serotonin-reuptake inhibitors are widely used as first-line treatments, their therapeutic effects typically require several weeks to emerge, and a substantial proportion of adolescents do not respond to an initial antidepressant trial. Together, the delayed efficacy and incomplete response contribute to a critical treatment gap during which vulnerable youth remain at elevated risk. These limitations have driven growing interest in rapid-acting interventions such as the N-methyl-D-aspartate (NMDA) receptor antagonist esketamine. Multiple pieces of evidence suggest that esketamine can produce faster symptom relief than conventional antidepressants,<sup>2</sup> including efficacy as a monotherapy in treatment-resistant depression<sup>3</sup>; however, its neural mechanisms remain incompletely understood. A clearer understanding of how esketamine acts on the developing brain is necessary to guide clinical use and to inform more targeted prevention strategies.
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