The Largest Human Hippocampus Study Yet Found Depression Stalls New Neuron Growth
Researchers mapped nearly half a million individual brain cells from hippocampal tissue, comparing people with major depressive disorder to controls at single-cell resolution — the largest dataset of its kind. Adult neurogenesis, the hippocampus's ongoing production of new neurons throughout life, was measurably stalled in the depression group, alongside broader molecular disruptions in synaptic function, energy metabolism, inflammation, and cellular stress response. It's descriptive, not interventional — the study shows what's different in depressed brains, not that fixing neurogenesis treats depression — but it's a plausible mechanistic thread connecting to why several psychedelics and ketamine, which promote neuroplasticity and in some cases new neuron growth in animal models, show antidepressant effects distinct from traditional SSRIs.
Read at Nature Medicine