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Differential regulation of neuregulin 1 expression by progesterone in astrocytes and neurons

  • Michael L. Lacroix-Fralish (a1) (a2), Vivianne L. Tawfik (a1) (a2), Nancy Nutile-Mcmenemy (a3) (a2), Brent T. Harris (a4) (a2) and Joyce A. Deleo (a1) (a3) (a2)
  • DOI:
  • Published online: 01 February 2007

Glial−neuronal interactions are crucial processes in neuromodulation and synaptic plasticity. The neuregulin 1 family of growth and differentiation factors have been implicated as bidirectional signaling molecules that are involved in mediating some of these interactions. We have shown previously that neuregulin 1 expression is regulated by the gonadal hormones progesterone and 17β-estradiol in the CNS, which might represent a novel, indirect mechanism of the neuromodulatory actions of these gonadal hormones. In the present study, we sought to determine the effects of progesterone and 17β-estradiol on neuregulin 1 expression in rat cortical astrocytes and neurons in vitro. We observed that progesterone increased the expression of neuregulin 1 mRNA and protein in a dose-dependent manner in cultured astrocytes, which was blocked by the progesterone receptor antagonist RU-486. In contrast, 17β-estradiol did not increase either neuregulin 1 mRNA or protein in astrocytes. We observed no effect of either progesterone or 17β-estradiol on neuregulin 1 mRNA and protein in rat cortical neurons in vitro. Finally, we observed that treatment of cortical neurons with recombinant NRG1-β1 caused PSD-95 to localize in puncta similar to that observed following treatment with astrocyte-conditioned medium. These results demonstrate that progesterone regulates neuregulin 1 expression, principally in astrocytes. This might represent a novel mechanism of progesterone-mediated modulation of neurotransmission through the regulation of astrocyte-derived neuregulin 1.

Corresponding author
Correspondence should be addressed to Joyce A. Deleo PhD, Departments of Anesthesiology and Pharmacology, HB 7125, One Medical Center Drive, Lebanon, NH 03756, USA email:
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Neuron Glia Biology
  • ISSN: 1740-925X
  • EISSN: 1741-0533
  • URL: /core/journals/neuron-glia-biology
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