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Cell Rep. 2019 Feb 5;26(6):1443-1457.e5. doi: 10.1016/j.celrep.2019.01.038.

Brain-State-Dependent Modulation of Neuronal Firing and Membrane Potential Dynamics in the Somatosensory Thalamus during Natural Sleep.

Author information

1
Physiopathology of Sleep Networks, Lyon Neuroscience Research Center, INSERM U1028-CNRS UMR5292, Université Claude-Bernard-Lyon 1, 69372 Lyon, France. Electronic address: nadia.urbain@inserm.fr.
2
Coding in Memory and Olfaction, Lyon Neuroscience Research Center, INSERM U1028-CNRS UMR5292, Université Claude-Bernard-Lyon 1, 69372 Lyon, France.
3
Physiopathology of Sleep Networks, Lyon Neuroscience Research Center, INSERM U1028-CNRS UMR5292, Université Claude-Bernard-Lyon 1, 69372 Lyon, France.
4
Forgetting Processes and Cortical Dynamics, Lyon Neuroscience Research Center, INSERM U1028-CNRS UMR5292, Université Claude-Bernard-Lyon 1, 69372 Lyon, France.
5
Integrated Physiology of Brain Arousal Systems, Lyon Neuroscience Research Center, INSERM U1028-CNRS UMR5292, Université Claude-Bernard-Lyon 1, 69372 Lyon, France.

Abstract

The thalamus plays a central role in sleep rhythms in the mammalian brain and, yet, surprisingly little is known about its function and interaction with local cortical oscillations during NREM sleep (NREM). We investigated the neuronal correlates of cortical barrel activity in the two corresponding thalamic nuclei, the ventral posterior medial (VPM), and the posterior medial (Pom) nuclei during natural NREM in mice. Our data reveal (1) distinct modulations of VPM and Pom activity throughout NREM episodes, (2) a thalamic nucleus-specific phase-locking to cortical slow and spindle waves, (3) cell-specific subthreshold spindle oscillations in VPM neurons that only partially overlap with cortical spindles, and (4) that spindle features evolve throughout NREM episodes and vary according to the post-NREM state. Taken together, our results suggest that, during natural sleep, the barrel cortex exerts a leading role in the generation and transfer of slow rhythms to the somatosensory thalamus and reciprocally for spindle oscillations.

KEYWORDS:

NREM; cortical states; electrophysiology; intracellular recordings; local field potential; sharp recordings; single-unit recordings; sleep; somatosensory; thalamus

PMID:
30726730
DOI:
10.1016/j.celrep.2019.01.038
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