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Neuronal THY1 Signaling Maintains Astrocytes in a Quiescent State.

Juliane Loui1,2, Ute Krügel3, Ulrike Winkler2

  • 1Department of Allergology, Venerology and Dermatology, Leipzig University, Leipzig, Germany.

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|September 12, 2025
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Neuronal THY1 (Thy1) protein maintains astrocyte quiescence. Its absence leads to astrocyte activation, impacting brain homeostasis and potentially aiding tissue repair.

Keywords:
THY1astrocyteneuron

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Molecular Biology

Background:

  • Thy1 is a neuronal surface protein with an unknown role in the brain.
  • Thy1 receptors on astrocytes suggest a role in neuron-astrocyte communication.

Purpose of the Study:

  • Investigate Thy1's role in neuron-astrocyte communication.
  • Determine Thy1's impact on astrocyte activation and proliferation.

Main Methods:

  • Utilized Thy1-knockout mouse models (full and neuron-specific).
  • Analyzed astrocyte activation markers (GFAP, Vim, Tnc) post-injury and aging.
  • Performed primary astrocyte cultures with recombinant Thy1.
  • Identified ITGB1 as the Thy1 interaction partner on astrocytes.

Main Results:

  • Aged Thy1-knockout mice showed increased astrocyte activation markers.
  • Neuronal Thy1 deletion led to permanent astrocytic activation after injury.
  • Thy1 inhibited astrocyte proliferation and promoted apoptosis in vitro.
  • Neuronal THY1 interacts with astrocyte ITGB1 to control astrocyte activation.

Conclusions:

  • Neuronal THY1 maintains astrocyte quiescence.
  • Loss of neuronal THY1 results in a partially activated astrocyte phenotype.
  • Neuronal THY1 is a novel regulator of brain tissue homeostasis and repair.