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Olfactory bulb astrocytes mediate sensory circuit processing through Sox9 in the mouse brain.

ABSTRACT: The role of transcription factors during astrocyte development and their subsequent effects on neuronal development has been well studied. Less is known about astrocytes contributions towards circuits and behavior in the adult brain. Astrocytes play important roles in synaptic development and modulation, however their contributions towards neuronal sensory function and maintenance of neuronal circuit architecture remain unclear. Here, we show that loss of the transcription factor Sox9 results in both anatomical and functional changes in adult mouse olfactory bulb (OB) astrocytes, affecting sensory processing. Indeed, astrocyte-specific deletion of Sox9 in the OB results in decreased odor detection thresholds and discrimination and it is associated with aberrant neuronal sensory response maps. At functional level, loss of astrocytic Sox9 impairs the electrophysiological properties of mitral and tufted neurons. RNA-sequencing analysis reveals widespread changes in the gene expression profiles of OB astrocytes. In particular, we observe reduced GLT-1 expression and consequential alterations in glutamate transport. Our findings reveal that astrocytes are required for physiological sensory processing and we identify astrocytic Sox9 as an essential transcriptional regulator of mature astrocyte function in the mouse OB.

SUBMITTER: Ung K

PROVIDER: S-EPMC8410770 | biostudies-literature |

REPOSITORIES: biostudies-literature

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Persistent Structural Plasticity Optimizes Sensory Information Processing in the Olfactory Bulb.

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Project description:This SuperSeries is composed of the SubSeries listed below.

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Olfactory bulb gene expression profiling upon loss of Sox9 in adult astrocytes

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