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Related Concept Videos

Gonadal and Placental Hormones01:24

Gonadal and Placental Hormones

The gonads, namely the testes in males and the ovaries in females, are pivotal in producing gonadal hormones that orchestrate the intricate processes of sexual development and reproduction.
In males, testosterone is the primary gonadal androgen. It plays a central role in the maturation of male reproductive organs — the penis and testes. Additionally, testosterone is instrumental in the development of secondary sexual characteristics — a deep voice as well as facial and pubic hair growth — and...
Overview of the Reproductive System01:31

Overview of the Reproductive System

The reproductive system generates offspring, ensuring the survival of the species. In humans, the reproductive system is complex and involves a variety of organs and hormones that work together to ensure successful reproduction.
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Testosterone: Functions and Regulation01:26

Testosterone: Functions and Regulation

The intricate hormonal interplay essential for male reproductive health begins with the release of gonadotropin-releasing hormone (GnRH) by the hypothalamus. This hormone prompts the pituitary gland to secrete follicle-stimulating hormone (FSH) and luteinizing hormone (LH). LH targets the Leydig cells in the testes, stimulating them to produce and release testosterone. In concert with testosterone, FSH acts on the Sertoli cells within the seminiferous tubules to facilitate the release of...
Hormonal Control of the Ovarian Cycle01:30

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The ovarian cycle is meticulously regulated by the hypothalamic-pituitary-gonadal axis. This cycle orchestrates the release of a mature oocyte, essential for reproduction.
Before puberty, the hypothalamus releases GnRH in a low frequency, low amplitude pulsatile manner. This along with the immature hypothalamic-pituitary-gonadal axis activity, results in low estrogen levels and the absence of a fully functional ovarian cycle.  At puberty, GnRH secretion increases in both frequency and...
Hormonal Regulation of the Menstrual Cycle01:22

Hormonal Regulation of the Menstrual Cycle

The ovarian cycle regulates endometrial changes throughout a single menstrual cycle via the coordinated action of gonadotrophin-releasing hormone (GnRH) and gonadotrophins.
At puberty, GnRH begins a pulsatile release pattern, which triggers the anterior pituitary gland to secrete follicle-stimulating hormone (FSH) and luteinizing hormone (LH). The frequency and amplitude of GnRH pulses vary across the menstrual cycle, with faster pulses favoring LH release and slower pulses favoring FSH release.
Transgenic Organisms00:53

Transgenic Organisms

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Related Experiment Video

Updated: Jul 6, 2026

Dual Somatic Recordings from Gonadotropin-Releasing Hormone (GnRH) Neurons Identified by Green Fluorescent Protein (GFP) in Hypothalamic Slices
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Dual Somatic Recordings from Gonadotropin-Releasing Hormone (GnRH) Neurons Identified by Green Fluorescent Protein (GFP) in Hypothalamic Slices

Published on: February 23, 2010

Functional characterization of genetically labeled gonadotropes.

Shuping Wen1, Jürgen R Schwarz, Dragos Niculescu

  • 1Institute for Neural Signal Transduction, Center for Molecular Neurobiology, Falkenried 94, D-20253 Hamburg, Germany.

Endocrinology
|March 8, 2008
PubMed
Summary

Researchers developed a new mouse model for studying gonadotropes, essential for reproduction. This tool allows precise visualization and functional analysis of these cells, revealing significant heterogeneity in their responses.

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Published on: March 21, 2017

Area of Science:

  • Reproductive Biology
  • Endocrinology
  • Neuroendocrinology

Background:

  • Gonadotropes are vital for reproduction but challenging to isolate for functional studies due to their dispersed nature in the anterior pituitary.
  • Existing methods limit detailed analysis of gonadotrope heterogeneity and function.

Purpose of the Study:

  • To develop a novel mouse model for specific visualization and manipulation of gonadotrope cells.
  • To enable detailed functional analysis of gonadotropes at the single-cell level.

Main Methods:

  • Generated a knock-in mouse model using gene targeting to coexpress Cre recombinase with the GnRH receptor in gonadotropes.
  • Utilized Cre-mediated recombination of a yellow fluorescent protein reporter for specific gonadotrope labeling (>99% efficiency).
  • Employed electrophysiology, calcium imaging, and single-cell secretion studies to analyze gonadotrope function.

Main Results:

  • The new mouse model allows for specific and efficient labeling of gonadotropes in the anterior pituitary.
  • Significant heterogeneity was observed in the resting properties and GnRH responses of male gonadotropes.
  • Approximately 50% of gonadotropes did not exhibit luteinizing hormone (LH) or follicle-stimulating hormone (FSH) secretion; GnRH induced variable electrophysiological and calcium responses.

Conclusions:

  • The developed mouse model is a versatile tool for advancing gonadotrope research and understanding reproductive control.
  • The findings highlight substantial functional heterogeneity within the gonadotrope population, challenging previous assumptions.
  • This model facilitates unbiased sampling and detailed functional characterization of gonadotropes.