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Astrocytic TCF7L2 Impacts Brain Osmoregulation and Restricts Neuronal Excitability.

Mariusz Popek1, Krzysztof Goryca2, Dorota Adamska2

  • 1Department of Neurotoxicology, Mossakowski Medical Research Institute, Polish Academy of Sciences, Warsaw, Poland.

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|December 6, 2025
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Summary

Astrocytic TCF7L2 is vital for maintaining brain homeostasis by regulating ion and amino acid transport. Its loss impairs astrocyte function, impacting neuronal excitability and development.

Keywords:
TCF7L2Wnt/β‐cateninastrocyteneurontranscription factor

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Area of Science:

  • Neuroscience
  • Astrocyte Biology
  • Molecular Mechanisms

Background:

  • Astrocyte maturation is crucial for neuronal function, but the underlying molecular regulators are not fully understood.
  • Wnt/β-catenin signaling and its downstream transcription factor, TCF7L2, are implicated in astrocyte development.

Purpose of the Study:

  • To investigate the role of TCF7L2 in postnatal astrocytes.
  • To elucidate the molecular mechanisms by which astrocytes support neuronal function.

Main Methods:

  • Conditional knockout of Tcf7l2 in mice.
  • Single-nucleus RNA sequencing.
  • Electrophysiology and microdialysis.

Main Results:

  • Loss of TCF7L2 in astrocytes led to transcriptional dysregulation, affecting amino acid and ion transport.
  • Impaired extracellular potassium clearance and astrocyte swelling were observed.
  • Neuronal excitability and resting membrane potential were altered in cortical pyramidal neurons.

Conclusions:

  • Astrocytic TCF7L2 is essential for maintaining extracellular homeostasis and supporting neuronal function in adulthood.
  • TCF7L2 regulates astrocyte-mediated neurophysiological support.
  • This highlights the critical role of TCF7L2 in astrocyte maturation and function.