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Spermatogenesis in Explanted Fetal Mouse Testis Tissues.

Kazuaki Kojima1, Takuya Sato1, Yuta Naruse1

  • 1Laboratory of Proteomics, Institute of Molecular Medicine and Life Science, Yokohama City University Association of Medical Science, Yokohama, Japan.

Biology of Reproduction
|July 16, 2016
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Summary
This summary is machine-generated.

This study successfully cultured fetal mouse testes using AlbuMAX medium, demonstrating spermatogenic progression and haploid cell production in testes from 14.5 to 19.5 days postcoitum. Earlier fetal testes did not show meiotic progression in this simple culture system.

Keywords:
organ culturespermatogenesistestis development

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Area of Science:

  • Reproductive Biology
  • Developmental Biology
  • Cell Biology

Background:

  • Previous work established successful spermatogenesis induction in neonatal mouse testes using AlbuMAX-supplemented agarose gel culture.
  • The efficacy of this method for fetal testes remained unexamined.

Purpose of the Study:

  • To evaluate the AlbuMAX-containing culture method for its ability to support spermatogenesis in fetal mouse testes.
  • To determine the earliest developmental stage of fetal testes capable of undergoing meiotic progression in vitro.

Main Methods:

  • Fetal testes from Acrosin (Acr)-Gfp transgenic mice, ranging from 13.5 to 19.5 days postcoitum (dpc), were cultured on agarose gel with AlbuMAX-supplemented medium.
  • Spermatogenic progression and meiotic entry were assessed by monitoring Acr-Gfp expression, a marker for mid-meiotic germ cells.

Main Results:

  • Fetal testes cultured from 14.5 dpc to 19.5 dpc exhibited spermatogenic progression and produced haploid cells.
  • Testes from 13.5 dpc or earlier did not display Acr-Gfp expression, indicating a lack of meiotic entry.
  • All cultured fetal testes, regardless of age, showed increased tissue mass due to seminiferous tubule elongation and thickening.

Conclusions:

  • The AlbuMAX culture method supports spermatogenic progression in fetal mouse testes from 14.5 dpc onwards.
  • This simple in vitro system is a valuable tool for studying fetal testicular development and germ cell biology.
  • A developmental threshold exists around 13.5-14.5 dpc for initiating meiotic progression in cultured fetal testes.