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- Title
Dynamic corticothalamic modulation of the somatosensory thalamocortical circuit during wakefulness.
- Authors
Dimwamwa, Elaida D.; Pala, Aurélie; Chundru, Vivek; Wright, Nathaniel C.; Stanley, Garrett B.
- Abstract
The feedback projections from cortical layer 6 (L6CT) to the sensory thalamus have long been implicated in playing a primary role in gating sensory signaling but remain poorly understood. To causally elucidate the full range of effects of these projections, we targeted silicon probe recordings to the whisker thalamocortical circuit of awake mice selectively expressing Channelrhodopsin-2 in L6CT neurons. Through optogenetic manipulation of L6CT neurons, multi-site electrophysiological recordings, and modeling of L6CT circuitry, we establish L6CT neurons as dynamic modulators of ongoing spiking in the ventral posteromedial nucleus of the thalamus (VPm), either suppressing or enhancing VPm spiking depending on L6CT neurons' firing rate and synchrony. Differential effects across the cortical excitatory and inhibitory sub-populations point to an overall influence of L6CT feedback on cortical excitability that could have profound implications for regulating sensory signaling across a range of ethologically relevant conditions. Layer 6 corticothalamic (L6CT) neurons provide feedback that shapes signaling in sensory pathways. Here, authors show that L6CT neurons are bi-directional modulators of thalamocortical signaling, in a manner dependent upon both L6CT magnitude and synchronization
- Subjects
THALAMOCORTICAL system; THALAMIC nuclei; WAKEFULNESS; CELLULAR signal transduction; THALAMUS; NEURONS; SYNCHRONIC order
- Publication
Nature Communications, 2024, Vol 15, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-024-47863-8