Columbia University study links depression to impaired neurogenesis

Researchers from the Columbia University Vagelos College of Physicians and Surgeons have discovered that major depressive disorder may impair or halt neurogenesis—the formation of new neurons—in the hippocampus. This region is one of the few areas in the adult brain capable of producing new nerve cells and is critical for episodic memory and emotional regulation.

The study suggests that a disruption in this process affects “pattern separation,” the brain's ability to distinguish between similar but distinct experiences. When this mechanism fails, individuals may struggle to separate the emotional weight of past negative memories from present events, potentially leading to more negative interpretations of current experiences.

In addition to impaired neurogenesis, scientists identified large-scale molecular changes, including alterations in genes related to neural connectivity, cellular energy production, and substance transport. Findings also indicated signs of inflammation and cellular stress within the hippocampal circuit. These insights into the biological mechanisms of depression could lead to new targeted treatments.