Journal article
A Distinct Down-to-Up Transition Assembly in the Retrosplenial Cortex during Slow-Wave Sleep
The Journal of neuroscience, v 45(14), pe1484242025
02 Apr 2025
PMID: 39952672
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Understanding the intricate mechanisms underlying slow-wave sleep (SWS) is crucial for deciphering the brain's role in memory consolidation and cognitive functions. It is well established that cortical delta oscillations (0.5-4 Hz) coordinate communications among cortical, hippocampal, and thalamic regions during SWS. These delta oscillations feature periods of Up and Down states, with the latter previously thought to represent complete cortical silence; however, new evidence suggests that Down states serve important functions for information exchange during memory consolidation. The retrosplenial cortex (RSC) is pivotal for memory consolidation due to its extensive connectivity with memory-associated regions, although it remains unclear how RSC neurons engage in delta-associated consolidation processes. Here, we employed multichannel in vivo electrophysiology to study RSC neuronal activity in
behaving male mice during natural SWS. We discovered a discrete assembly of putative excitatory RSC neurons (∼20%) that initiated firing at SWS Down states and reached maximal firing at the Down-to-Up transitions. Therefore, we termed these RSC neurons the Down-to-Up transition assembly (DUA) and the remaining RSC excitatory neurons as non-DUA. Compared with non-DUA, DUA neurons appear to exhibit higher firing rates and larger cell body size and lack monosynaptic connectivity with nearby RSC neurons. Furthermore, optogenetics combined with electrophysiology revealed differential innervation of RSC excitatory neurons by memory-associated inputs. Collectively, these findings provide insight into the distinct activity patterns of RSC neuronal subpopulations during sleep and their potential role in memory processes.
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Details
- Title
- A Distinct Down-to-Up Transition Assembly in the Retrosplenial Cortex during Slow-Wave Sleep
- Creators
- Ashley N Opalka - Department of Neurobiology and Anatomy, Drexel University College of Medicine, Philadelphia, Pennsylvania 19129Kimberly J Dougherty - Drexel University, Neurobiology and AnatomyDong V Wang - Drexel University, Neurobiology and Anatomy
- Publication Details
- The Journal of neuroscience, v 45(14), pe1484242025
- Grant note
- R01 MH119102 / NIMH NIH HHS R01 NS130799 / NINDS NIH HHS R21 MH134016 / NIMH NIH HHS
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Neurobiology and Anatomy; Neurology
- Web of Science ID
- WOS:001460933300001
- Scopus ID
- 2-s2.0-105001954750
- Other Identifier
- 991022028049204721
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- Web of Science research areas
- Neurosciences