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Quantitative PCR-based Assay to Measure Sonic Hedgehog Signaling in Cellular Model of Ciliogenesis
Published on: January 31, 2025
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Sonic hedgehog signaling in astrocytes mediates cell type-specific synaptic organization
Steven A Hill1, Andrew S Blaeser1, Austin A Coley2
1Department of Biology, Drexel University, Philadelphia, United States.
Elife
|June 14, 2019
Summary
Sonic hedgehog (Shh) signaling in astrocytes is crucial for regulating synapse development. Disrupting Shh in astrocytes leads to increased synapse numbers and impaired neuronal function, highlighting astrocyte-neuron communication in brain plasticity.
Area of Science:
- Neuroscience
- Astrocyte biology
- Synaptic plasticity
Background:
- Astrocytes are key regulators of synapse formation and function.
- Mechanisms underlying astrocyte-neuron interactions remain largely unknown.
Purpose of the Study:
- To investigate the role of Sonic hedgehog (Shh) signaling in mature astrocytes.
- To understand how astrocyte Shh signaling impacts cortical synapse organization and remodeling.
Main Methods:
- Selective disruption of Shh signaling in astrocytes in postnatal mice.
- Analysis of synapse number and dendritic spine turnover.
- Measurement of neuronal excitability and Kir4.1 channel expression.
Main Results:
- Shh signaling in astrocytes is active in deep cortical layers.
- Disruption of astrocyte Shh signaling increases synapse number on layer V apical dendrites.
- Impaired dendritic spine turnover, increased neuronal excitability, and reduced Kir4.1 expression were observed in mutant mice.
Conclusions:
- Astrocyte Shh signaling is essential for cell-type-specific modulation of cortical synapse structure.
- Shh signaling in astrocytes plays a critical role in sculpting neuronal connections and regulating brain activity.
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