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Estradiol Mediates Astrocyte-Neuron Communication in the Hippocampus.

Julianna Goenaga1, Carmen Nanclares1, Megan Hall1

  • 1Department of Neuroscience, University of Minnesota, 6 - 145 Jackson Hall, 321 Church Street SE, Minneapolis, MN, 55455, USA.

Molecular Neurobiology
|April 10, 2025
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Summary
This summary is machine-generated.

Estradiol (E2) signals to astrocytes in the mouse hippocampus, modulating astrocyte activity and influencing neuron communication. This hormone-mediated astrocyte-neuron signaling occurs in both sexes and impacts synaptic transmission.

Keywords:
AstrocytesCalciumEstrogenHippocampusSlow Inward Currents

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Area of Science:

  • Neuroscience
  • Cellular Biology
  • Endocrinology

Background:

  • Astrocyte-neuron communication is crucial for brain function.
  • Hormonal regulation of astrocyte function, particularly by estradiol (E2), is not well understood.
  • Estrogen receptors (ERs) are known to influence neuronal activity, but their role in astrocytes is unclear.

Purpose of the Study:

  • To investigate the impact of estradiol on astrocyte activity and communication in the mouse hippocampus.
  • To determine if estradiol directly signals to astrocytes in situ.
  • To elucidate the functional consequences of E2-mediated astrocyte signaling on neuronal function.

Main Methods:

  • RNAscope to detect estrogen receptor expression in astrocytes.
  • Confocal imaging to assess astrocyte calcium responses to E2.
  • Electrophysiological recordings to measure slow inward currents (SICs) and excitatory synaptic transmission in neurons.
  • Pharmacological blockade of estrogen receptors using ICI 182,780.

Main Results:

  • Estrogen receptors alpha (ERα) and beta (ERβ) are expressed in hippocampal astrocytes in both male and female mice.
  • Estradiol application caused calcium elevations in astrocytes in both sexes.
  • Estradiol increased the frequency of slow inward currents (SICs) in neurons, indicating enhanced gliotransmission.
  • Estradiol reduced excitatory synaptic transmission in female mice only.
  • The effects of E2 were blocked by the estrogen receptor antagonist ICI 182,780.

Conclusions:

  • Estradiol directly signals to astrocytes in the hippocampus, establishing estradiol-mediated astrocyte-neuron communication in both sexes.
  • Estradiol modulates astrocyte activity, influencing gliotransmission and synaptic transmission.
  • These findings reveal a novel mechanism by which hormones can regulate brain function via astrocytes.