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Related Experiment Video

Updated: Jun 4, 2026

An In Vivo Estrogen Deficiency Mouse Model for Screening Exogenous Estrogen Treatments of Cardiovascular Dysfunction After Menopause

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Estradiol down-regulates RF-amide-related peptide (RFRP) expression in the mouse hypothalamus.

C S Molnár¹, I Kalló, Z Liposits

¹Laboratory of Endocrine Neurobiology, Institute of Experimental Medicine, Hungarian Academy of Sciences, Budapest, 1083 Hungary.

|February 18, 2011

Summary

RF-amide-related peptides (RFRP) are negatively regulated by estradiol in mice. This estrogenic down-regulation of RFRP expression may contribute to reproductive axis feedback.

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Last Updated: Jun 4, 2026

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Ovariectomy and 17β-estradiol Replacement in Rats and Mice: A Visual Demonstration

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Published on: June 7, 2012

Area of Science:

Neuroendocrinology
Reproductive Biology

Background:

RF-amide-related peptides (RFRP) are synthesized in the dorsomedial hypothalamic nucleus.
RFRPs regulate reproduction by inhibiting gonadotropin-releasing hormone (GnRH) neurons.

Purpose of the Study:

Investigate the role of RFRP-synthesizing neurons in estrogen feedback signaling to the reproductive axis in mice.
Determine if estrogen directly regulates RFRP neurons.

Main Methods:

Quantitative in situ hybridization to measure prepro-RFRP mRNA expression.
Immunohistochemistry to detect estrogen receptor (ER)-α and ER-β in RFRP neurons.
Ovariectomized mice with and without 17β-estradiol (E2) replacement were used.

Main Results:

Subcutaneous E2 administration significantly down-regulated prepro-RFRP mRNA expression.
Low levels of nuclear ER-α immunoreactivity were detected in a subset of RFRP neurons (18.7 ± 3.8%).
RFRP neurons did not exhibit ER-β immunoreactivity.

Conclusions:

RFRP acts as a negatively estradiol-regulated neurotransmitter/neuromodulator in mice.
Estrogenic down-regulation of RFRP expression may contribute to estrogen feedback to the reproductive axis.
Direct regulation of RFRP neurons by E2 remains uncertain due to low ER-α expression in a subset of cells.