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Related Experiment Video

Updated: Jun 9, 2025

Using Primary Neurosphere Cultures to Study Primary Cilia
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Primary cilia shape postnatal astrocyte development through Sonic Hedgehog signaling.

Rachel Bear1,2, Steven A Sloan1, Tamara Caspary1

  • 1Department of Human Genetics, Emory University School of Medicine, 615 Michael Street Suite 301, Atlanta GA 30322.

Biorxiv : the Preprint Server for Biology
|October 28, 2024
PubMed
Summary

Astrocyte cilia are crucial for Sonic Hedgehog (Shh) signaling during brain development. Their absence impairs astrocyte proliferation and maturation, offering insights into neurodevelopmental disorders.

Keywords:
Sonic Hedgehogastrocytesciliadevelopmentmorphologyproliferation

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Developmental Biology

Background:

  • Primary cilia act as signaling hubs regulating cellular processes, including neuron and glia development.
  • Astrocytes, crucial glial cells, possess cilia, yet their developmental role is poorly understood.
  • Cilia and astrocyte dysfunction are implicated in neurodevelopmental disorders.

Purpose of the Study:

  • To investigate the function of cilia in astrocyte development and their role in Sonic Hedgehog (Shh) signaling.
  • To determine the impact of astrocyte cilia loss on astrocyte proliferation and maturation.

Main Methods:

  • Utilized genetic ablation of astrocyte cilia in vivo at distinct developmental stages.
  • Analyzed changes in Shh transcriptional targets and astrocyte morphology.
  • Assessed astrocyte proliferation rates.

Main Results:

  • A subpopulation of developing astrocytes in the prefrontal cortex expresses ciliary protein ARL13B and is ciliated.
  • Loss of astrocyte cilia led to decreased Shh signaling in both immature and mature astrocytes.
  • Ablation of cilia in immature astrocytes reduced proliferation, while in mature astrocytes, it caused enlarged morphology.

Conclusions:

  • Astrocytes require cilia for proper Shh signaling throughout development.
  • Astrocyte cilia play essential roles in regulating astrocyte proliferation and maturation.
  • Findings enhance understanding of astrocyte development, cilia function, and neurodevelopmental disorders.