Neuroinflammatory astrocyte subtypes in the mouse brain.
Philip Hasel1, Indigo V L Rose2, Jessica S Sadick2
1Neuroscience Institute, NYU Grossman School of Medicine, New York, NY, USA. philip.hasel@nyulangone.org.
Nature Neuroscience
|August 20, 2021
Summary
Inflammation rapidly alters astrocyte gene expression over time. Single-cell sequencing reveals distinct astrocyte subtypes and their spatial distribution in the brain during inflammatory responses.
Area of Science:
- Neuroscience
- Immunology
- Cell Biology
Background:
- Astrocytes, crucial glial cells in the central nervous system, exhibit inflammatory changes in response to various neurological conditions.
- The temporal dynamics, sex-based differences, single-cell heterogeneity, and spatial distribution of astrocyte inflammatory transitions remain poorly understood.
Purpose of the Study:
- To investigate the temporal and heterogeneous transcriptomic changes in mouse cortical astrocytes following acute inflammation.
- To characterize distinct astrocyte subtypes and their spatial localization during inflammatory responses.
Main Methods:
- Single-cell RNA sequencing of approximately 80,000 mouse cortical astrocytes after lipopolysaccharide (LPS) stimulation.
- Spatial transcriptomics and in situ hybridization to map astrocyte sub-states within specific brain regions.
Main Results:
- Rapid transcriptomic alterations in astrocytes were observed within hours of LPS exposure, evolving significantly over time.
- Inflammation induced a widespread astrocyte response, with distinct subtypes displaying unique transcriptomic profiles and inflammatory transitions.
- Specific brain regions were associated with key sub-states of inflammation-induced reactive astrocytes.
Conclusions:
- Astrocyte inflammatory responses are dynamic, heterogeneous, and spatially organized.
- The study provides a valuable dataset for understanding astrocyte heterogeneity and the functional significance of regionally defined reactive astrocyte states.
