Basal forebrain somatostatin cells differentially regulate local gamma oscillations and functionally segregate motor and cognitive circuits

Scientific Reports
Nelson EspinosaPablo Fuentealba

Abstract

The basal forebrain delivers extensive axonal projections to the cortical mantle regulating brain states and cognitive processing. Recent evidence has established the basal forebrain as a subcortical node of the default mode network that directionally influences cortical dynamics trough gamma oscillations, yet their synaptic origin has not been established. Here, we used optogenetic stimulation and in vivo recordings of transgenic mice to show that somatostatin neurons exert an anatomically specialized role in the coordination of subcortical gamma oscillations of the rostral basal forebrain. Indeed, the spike timing of somatostatin cells was tightly correlated with gamma oscillations in the ventral pallidum, but not in the medial septum. Consequently, optogenetic inactivation of somatostatin neurons selectively disrupted the amplitude and coupling of gamma oscillations only in the ventral pallidum. Moreover, photosupression of somatostatin cells produced specific behavioral interferences, with the ventral pallidum regulating locomotor speed and the medial septum modulating spatial working memory. Altogether, these data suggest that basal forebrain somatostatin cells can selectively synchronize local neuronal networks in the gam...Continue Reading

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Citations

Aug 28, 2020·IScience·Lore M PeetersGeorgios A Keliris
Mar 26, 2021·CNS Neuroscience & Therapeutics·Shuang CaiShou-Yang Yu
Feb 10, 2020·Epilepsy & Behavior : E&B·Joseane Righes MarafigaMaria Elisa Calcagnotto
Aug 10, 2021·Frontiers in Neural Circuits·Petra Mocellin, Sanja Mikulovic

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Methods Mentioned

BETA
transgenic
PCR
biopsies

Software Mentioned

SOM
Idtracker
Matlab
EEGLAB
Chronux

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