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Transcriptional changes during astrocyte maturation in vivo at single cell resolution II

ABSTRACT: Transcriptional changes during astrocyte maturation in vivo at single cell resolution II

PROVIDER: PRJNA705355 | ENA |

REPOSITORIES: ENA

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Transcriptional changes during astrocyte maturation in vivo at single cell resolution II

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Project description:Astrocytes tile the central nervous system, but their functions in neural microcircuits in vivo and their roles in mammalian behavior remain incompletely defined. We used 2-photon laser scanning microscopy (2PLSM), electrophysiology, MINIscopes, RNA-seq and a new genetic approach to characterize the effects of reduced striatal astrocyte Ca2+ signaling in vivo. In wild type mice, reducing striatal astrocyte Ca2+-dependent signaling increased repetitive self-grooming behaviors by altering medium spiny neuron (MSN) activity. The mechanism involved astrocyte-mediated neuromodulation mediated by ambient GABA and was corrected by blocking astrocyte GABA transporter 3 (GAT-3). Furthermore, in a mouse model of Huntington’s disease, dysregulation of GABA and astrocyte Ca2+ signaling accompanied excessive self-grooming, which was relieved by blocking GAT-3. Assessments with RNA-seq revealed astrocyte genes and pathways regulated by Ca2+ signaling in a cell autonomous and non-cell autonomous manner, including Rab11a, a regulator of GAT-3 functional expression. Thus, striatal astrocytes contribute to neuromodulation controlling obsessive-compulsive-like behavior in mice.

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