Study links depression to halted neuron growth in adult hippocampus
Researchers at Columbia University found that major depressive disorder is associated with a shutdown of new neuron production in the adult hippocampus, potentially impairing memory separation.
A large-scale study by Columbia University Irving Medical Center shows that major depressive disorder is linked to a cessation of adult hippocampal neurogenesis, undermining the brain's capacity for pattern separation between new and old memories. Using single-cell gene-expression profiling of nearly half a million cells from deceased donors, the team uncovered altered activity in genes tied to synapse formation, energy metabolism, and intracellular transport, as well as signs of inflammation in the hippocampal trisynaptic circuit.
Professor Maura Dupont explained that the loss of newborn neurons may reduce resilience to stress and that reactivating neurogenesis could rewire emotional memory circuits. The findings also highlighted epigenetic changes reflecting environmental influences, supporting the idea that depression encompasses diverse molecular forms. The authors propose classifying depression by its cellular signatures, akin to modern cancer taxonomy, to guide more precise treatments. The study was published in Nature Medicine on Aug. 21, 2026.
Why it matters
Understanding how depression disrupts brain cell growth could lead to targeted therapies for a condition affecting millions.
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