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Germ Cell Transplantation and Testis Tissue Xenografting in Mice
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Gonadotropin storage and trafficking.

Asia Ingram1, T Rajendra Kumar1,2

  • 1Integrated Physiology Graduate Program, University of Colorado Anschutz Medical Campus, Aurora, Colorado, USA.

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Summary
This summary is machine-generated.

Altering follicle-stimulating hormone (FSH) secretion via luteinizing hormone (LH) pathways enhances female ovulation. Rerouting FSH in male mice showed no functional improvement, highlighting sex-specific reproductive mechanisms.

Keywords:
FSHLHdense core granulegonadotropinpituitarysecretion

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Area of Science:

  • Reproductive biology
  • Endocrinology
  • Molecular endocrinology

Background:

  • Gonadotropins, luteinizing hormone (LH) and follicle-stimulating hormone (FSH), are crucial for vertebrate reproduction.
  • LH and FSH, synthesized in gonadotropes, exhibit distinct storage and secretion patterns.
  • FSH is primarily constitutively secreted, while LH is stored and released via a regulated pathway.

Purpose of the Study:

  • To comparatively review gonadotropin storage and secretion patterns across vertebrate species.
  • To elucidate the molecular mechanisms governing differential gonadotropin trafficking and release.

Main Methods:

  • Comparative analysis of gonadotropin storage in vertebrates from primitive fish to mammals.
  • Critical discussion of in vitro and in vivo studies on gonadotropin trafficking and secretion.

Main Results:

  • Evolution from a single gonadotropin in primitive fish to distinct LH and FSH in vertebrates.
  • Presence of monohormonal gonadotropes in teleost fish and bihormonal gonadotropes in higher vertebrates.
  • Identification of the LHβ carboxy terminus heptapeptide as a key determinant for regulated secretion pathway sorting.

Conclusions:

  • Engineering FSH to utilize the regulated secretion pathway (via LHβ heptapeptide fusion) in transgenic mice enhances ovulation and ovarian survival in females.
  • No functional gains were observed in male mice with rerouted FSH, indicating sex-specific effects.
  • Understanding these mechanisms offers potential for clinical applications in enhancing female reproductive function and lifespan.