Primary Function of the Prefrontal Cortex in Depression

The prefrontal cortex is fundamentally involved in cognition, emotional regulation, attention, impulse control, and executive function, according to the American Academy of Pediatrics 2
The dorsolateral prefrontal cortex (DL-PFC) specifically mediates emotion regulation, with increased activation in this region during negative emotion regulation correlating with improvement in depression severity, as reported by the American Psychological Association 3

Common Alterations in Depression

The hallmark alteration in depression is decreased functional connectivity between the prefrontal cortex and amygdala, coupled with reduced PFC volume and activity, as noted by the Praxis Medical Insights 1
Decreased functional connectivity between the PFC and amygdala impairs the brain's ability to regulate emotional responses, according to the Praxis Medical Insights 1

Activated microglia are present in the PFC, striatum, hippocampus, and anterior cingulate cortex (ACC), with activation positively correlating with depression severity, as found by the British Journal of Pharmacology 4
Elevated pro-inflammatory cytokines (IL-1β, IL-6, TNF-α) in the PFC contribute to depressive symptoms, as reported by the British Journal of Pharmacology 5 and the Praxis Medical Insights 1, 6

Family-focused therapy demonstrates treatment effects through increased dorsolateral PFC activation that correlates with mood symptom improvements, as reported by the American Psychological Association 3
Environmental enrichment reduces depression-like behaviors by decreasing IL-1β and TNF-α while increasing IL-10 in the medial prefrontal cortex, as found by the British Journal of Pharmacology 5
This modulation helps restore the balance in PFC-amygdala circuits and reduces neuroinflammation, as reported by the British Journal of Pharmacology 5 and the Praxis Medical Insights 1