Inside the depressed brain
Depression is a common condition, which makes understanding its biological roots especially important. For the first time, researchers at Columbia University’s Vagelos College of Physicians and Surgeons have direct evidence that the condition significantly slows the production of new neurons in people with a generalized depressive disorder. The work centered on the hippocampus, a brain area responsible for episodic memory and emotional responses, using roughly 500,000 cells donated shortly after the donors’ deaths.
Key findings
The results reveal that depression disrupts the entire hippocampal network. The observed changes affect:
- genes involved in building connections between neurons;
- communication between cells;
- energy supply;
- the transport of materials inside cells.
The researchers also found signs of inflammation and cellular stress, especially along the path where new emotional memories are formed.
In addition, the study uncovered epigenetic alterations — mechanisms that control gene activity in response to outside influences without changing the underlying DNA. Newly generated neurons appear to be essential for pattern separation, which allows the brain to distinguish the emotional weight of past memories from current experiences.
The findings were published in Nature Medicine (DOI: 10.1038/s41591-026-04571-8). They open a fresh window onto the mechanisms behind depression and may guide future investigations. A clearer grasp of how depression interferes with neurogenesis could also inform new treatments for a condition that takes a major personal and societal toll.
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