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Related Experiment Videos

17Beta-estradiol modulates hMT1 melatonin receptor function.

Monica I Masana1, Jose M Soares, Margarita L Dubocovich

  • 1Department of Molecular Pharmacology and Biological Chemistry, Northwestern University Feinberg School of Medicine, Chicago, Illinois 60611-3008, USA.

Neuroendocrinology
|April 6, 2005
PubMed
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17beta-estradiol differentially impacts melatonin receptors. Estradiol increases MT2 receptor density while attenuating MT1 receptor function and melatonin responses.

Area of Science:

  • Endocrinology and Pharmacology
  • G-protein-coupled receptor (GPCR) research
  • Cellular and Molecular Biology

Background:

  • Estrogen is known to modulate the expression and function of G-protein-coupled receptors.
  • Melatonin receptors (MT1 and MT2) are GPCRs involved in various physiological processes.
  • Chinese hamster ovary (CHO) cells expressing human melatonin receptors (hMT1/hMT2) provide a model for studying receptor regulation.

Purpose of the Study:

  • To investigate the effects of 17beta-estradiol on the density and function of MT1 and MT2 melatonin receptors.
  • To determine if estrogen receptor alpha and beta are present in the CHO cell line used.
  • To assess the impact of 17beta-estradiol on melatonin's ability to inhibit cAMP formation and stimulate G-protein activity.

Main Methods:

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  • Exposure of CHO-MT1/CHO-MT2 cells to 17beta-estradiol (10 nM) for 1 or 6 days.
  • RT-PCR amplification to detect estrogen receptor alpha and beta mRNA.
  • Quantification of 2-[125I]iodomelatonin binding to determine receptor density.
  • Assessment of melatonin's potency and maximal effect on forskolin-stimulated cAMP inhibition.
  • Measurement of [35S]GTPgammaS binding to evaluate G-protein activation.

Main Results:

  • 17beta-estradiol treatment significantly increased the density of MT2 melatonin receptors.
  • Estradiol did not alter the affinity of either MT1 or MT2 receptors for melatonin.
  • Melatonin's maximal inhibition of cAMP formation via MT1 receptors was attenuated by estradiol.
  • Estradiol treatment reduced melatonin-stimulated [35S]GTPgammaS binding to MT1 cell membranes.
  • Evidence suggests estradiol promotes constitutive activity of MT1 melatonin receptors.

Conclusions:

  • 17beta-estradiol differentially modulates MT1 and MT2 melatonin receptor function and expression.
  • Estradiol attenuates melatonin-mediated responses through MT1 receptor activation.
  • Estradiol treatment leads to an increased density of MT2 melatonin receptors.
  • The findings highlight a complex interplay between estrogen and melatonin signaling pathways.