Cited by 80Hypothalamic control of reproductive hormonesNeuropeptides and Animal PhysiologyEstrogen and related hormone effects

Estradiol Down-Regulates RF-Amide-Related Peptide (RFRP) Expression in the Mouse Hypothalamus

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Molnár, C. S., Kalló, I., Liposits, Z., Hrabovszky, E.·2011·Endocrinology

Abstract

In most mammals, RF-amide-related peptides are synthesized in the dorsomedial hypothalamic nucleus and regulate reproduction via inhibiting GnRH neurons and, possibly, adenohypophyseal gonadotrophs. In the present study, we investigated the possibility that RFRP-synthesizing neurons are involved in estrogen feedback signaling to the reproductive axis in mice. First, we used quantitative in situ hybridization and compared the expression of prepro-RFRP mRNA of ovariectomized mice, with and without 17β-estradiol (E2) replacement. Subcutaneous administration of E2 via silastic capsules for 4 d significantly down-regulated prepro-RFRP mRNA expression. The underlying receptor mechanism was investigated with immunohistochemistry. In ovariectomized mice, low levels of nuclear estrogen receptor (ER)-α immunoreactivity were detectable in 18.7 ± 3.8% of RFRP neurons. The majority of RFRP neurons showed no ER-α signal, and RFRP neurons did not exhibit ER-β immunoreactivity. Results of these studies indicate that RFRP is a negatively estradiol-regulated neurotransmitter/neuromodulator in mice. The estrogenic down-regulation of RFRP expression may contribute to estrogen feedback to the reproductive axis. The issue of whether E2 regulates RFRP neurons directly or indirectly remains open given that ER-α immunoreactivity is present only at low levels in a subset of these cells.

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Crossref · 10.1210/en.2010-1418

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  • E2 lowers RFRP-3 expression in mouse DMN, though only about 20% of RFRP-3 neurons have detectable ERα and none have ERβ.

    “E2 reduces RFRP-3 expression in the DMN of mice, although only ~20% of RFRP-3 neurons express detectable levels of ERα protein and no detectable ERβ53.”

    From Emerging insights into hypothalamic‐pituitary‐gonadal axis regulation and interaction with stress signalling (2018) · cites this paper as [53]

    Figure 1 (p. 4) shows that E2 reduced prepro-RFRP mRNA in the mouse dorsomedial nucleus. The receptor results (pp. 4–5) found detectable ERα in 18.7 ± 3.8% of RFRP neurons and no detectable ERβ. The paper measured precursor mRNA and identified neurons using RFRP-1 immunoreactivity; it did not specifically measure RFRP-3 expression or establish those receptor percentages for RFRP-3-identified neurons. (LLM, conf=0.86)

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Authors
Molnár, C. S., Kalló, I., Liposits, Z., & Hrabovszky, E.
Affiliations
Pázmány Péter Catholic University (HU)
Corresponding author
Hrabovszky, E.
Venue
Endocrinology
Published
2011-02-15
Volume
152
Issue
4
Pages
1684-1690
ISSN
  • 0013-7227 (ISSN-L)
  • 1945-7170
OpenAlex
W2039749586
Cited by
80
References
41
Citations by year
2026: 1 · 2025: 1 · 2024: 1 · 2023: 2 · 2022: 4 · 2021: 3 · 2020: 4 · 2019: 3 · 2018: 8 · 2017: 6 · 2016: 10 · 2015: 7 · 2014: 10 · 2013: 8 · 2012: 9
FWCI
10.65
Type
journal article
Language
en
Open access
Licence
public-domain
Locations
  • Endocrinology (publishedVersion, public-domain)
  • PubMed (publishedVersion)
Funders
Takeda Pharmaceutical Company
Topics
  • Health Sciences › Medicine › Reproductive Medicine › Hypothalamic control of reproductive hormones
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuropeptides and Animal Physiology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Estrogen and related hormone effects
Keywords
estradiol, estrogen feedback, hypothalamus, dorsomedial hypothalamus, estrogen receptor alpha, estrogen receptor beta, ovariectomy, GnRH neurons, reproductive axis, estrogen regulation of gene expression
MeSH terms
Animals, Estradiol, Hypothalamus, Immunohistochemistry, Neuropeptides, RNA, Messenger, In Situ Hybridization, Estrogen Receptor alpha, Estrogen Receptor beta, Mice

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