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Related Experiment Video

Updated: Oct 3, 2025

Extra Cellular Matrix-Based and Extra Cellular Matrix-Free Generation of Murine Testicular Organoids
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An in vitro system for experimentally induced cryptorchidism.

Kensuke Okugi1, Natsuki Kuwahara1, Natsumi Yanome1

  • 1Laboratory of Molecular Developmental Biology, Graduate School of Science and Engineering, Tokyo Denki University, Hatoyama, Saitama, 350-0394, Japan.

Histochemistry and Cell Biology
|February 22, 2022
PubMed
Summary

Cryptorchidism, the failure of testes to descend, is solely determined by temperature. Elevated temperatures (37°C) halt spermatogenesis and DNA synthesis, while cooler temperatures (34°C) permit it, clarifying temperature

Keywords:
Acr-GFP mouseApoptosisCryptorchidismIn vitro cultureSpermatogenesis

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Area of Science:

  • Reproductive Biology
  • Developmental Biology
  • Cell Biology

Background:

  • Cryptorchidism, a common male sexual development abnormality, involves undescended testes.
  • The precise mechanisms of temperature-induced germ cell loss in cryptorchidism remain unclear.
  • Elevated testicular temperature affects all major testicular cell types, impairing spermatogenesis.

Purpose of the Study:

  • To elucidate the role of temperature as the sole determinant of cryptorchidism.
  • To investigate the impact of elevated temperature on spermatogenesis using an in vitro system.

Main Methods:

  • Utilized an established in vitro system for culturing neonatal mouse testes.
  • Compared spermatogenesis progression at 37°C (elevated temperature) versus 34°C (scrotal temperature).
  • Assessed the effects of temperature on germ cell development and DNA synthesis.

Main Results:

  • Spermatogenesis was abrogated at 37°C, mimicking in vivo cryptorchidism.
  • Spermatogenesis proceeded normally at 34°C in cultured testes.
  • Spermatogenesis arrested before the early spermatocyte stage at 37°C, suppressing DNA synthesis.

Conclusions:

  • Temperature is the sole determining factor for cryptorchidism.
  • Elevated temperatures (37°C) significantly suppress DNA synthesis during spermatogenesis.
  • The in vitro system provides a valuable tool for studying cryptorchidism mechanisms.