Sleep-active hippocampal neurons help regulate memory consolidation in mice
Published in Brain/Neurology, Journals, Memory.
Published October 22, 2026.
A mouse study published online in Neuron on October 19 identifies hippocampal interneurons that help connect sleep state with memory consolidation.
Yili Feng and colleagues targeted neurons expressing Chrm2, the gene encoding the M2 acetylcholine receptor. These inhibitory neurons were particularly active during non-REM sleep and quiet wakefulness. Their activity was suppressed by acetylcholine, providing a possible link between changing neuromodulator levels and sleep-related circuit activity.
Suppressing this population in dorsal hippocampal CA3 impaired spatial memory, while suppressing corresponding neurons in the ventral hippocampus impaired social memory. Manipulating the cells also changed the occurrence of sharp-wave ripples, brief bursts of hippocampal activity associated with memory reactivation. Activation increased ripple occurrence; inhibition reduced it.
The findings offer a cellular entry point for investigating how sleep supports the stabilization of memories.
Limits: The experiments establish a mechanism in mice. They do not demonstrate a treatment for human memory disorders, show that stimulating these cells improves human memory, or establish that manipulating acetylcholine would reproduce the result safely.
Sources: Feng et al., Neuron, October 19, 2026; research institute report, October 20.