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Glucocorticoids decrease astrocyte numbers by reducing glucocorticoid receptor expression in vitro and in vivo.

Kazuhiro Unemura1, Toshiaki Kume, Minami Kondo

  • 1Department of Pharmacology, Graduate School of Pharmaceutical Sciences, Kyoto University, Sakyo-ku, Japan.

Journal of Pharmacological Sciences
|May 30, 2012
PubMed
Summary

Glucocorticoids, stress hormones, reduce astrocyte numbers and glucocorticoid receptor (GR) expression. This effect, mediated by GR signaling, was observed in both cell cultures and live rats, indicating a direct impact on brain cell populations.

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Area of Science:

  • Neuroendocrinology
  • Cell Biology
  • Astrocyte Biology

Background:

  • Glucocorticoids are critical stress hormones regulated by the hypothalamic-pituitary-adrenal axis.
  • Astrocytes play vital roles in brain function and are potentially influenced by stress hormones.
  • Understanding glucocorticoid effects on astrocytes is crucial for neuroendocrine and neurological research.

Purpose of the Study:

  • To investigate the impact of glucocorticoids on astrocyte proliferation and glucocorticoid receptor (GR) expression.
  • To elucidate the role of GR signaling in mediating these effects.
  • To examine glucocorticoid-induced changes in astrocytes both in vitro and in vivo.

Main Methods:

  • Primary astrocyte cultures were treated with corticosterone and dexamethasone, with and without the GR antagonist RU486.
  • Glucocorticoid receptor (GR) knockdown was performed using siRNA.
  • In vivo studies involved administering adrenocorticotropic hormone to rats to induce excessive glucocorticoid release.

Main Results:

  • Corticosterone and dexamethasone significantly reduced astrocyte proliferation and GR expression in vitro.
  • The GR antagonist RU486 and GR knockdown by siRNA blocked these reductions.
  • In vivo, excessive glucocorticoid exposure led to decreased GR expression in the prefrontal cortex and hippocampus, and reduced astrocyte numbers in the frontal cortex.

Conclusions:

  • Glucocorticoids decrease the number of astrocytes.
  • This reduction is mediated through the glucocorticoid receptor (GR) signaling pathway.
  • These findings highlight a direct link between stress hormone levels and astrocyte populations in the brain.