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Related Experiment Videos

Testicular steroidogenesis in the Cebus monkey throughout postnatal development

R Rey1, S Campo, S Ayuso

  • 1Centro de Investigaciones Endocrinológicas, Hospital de Niños, Buenos Aires, Argentina.

Biology of Reproduction
|May 1, 1995
PubMed
Summary

New World monkey testes produce testosterone throughout development, with the delta-5 pathway being dominant. Testosterone levels per Leydig cell increase with age, peaking at puberty.

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Area of Science:

  • Reproductive Biology
  • Endocrinology
  • Developmental Biology

Background:

  • Limited data exists on testicular steroidogenesis in developing New World monkeys.
  • Understanding primate testicular function is crucial for comparative endocrinology.

Purpose of the Study:

  • To investigate the in vitro steroidogenic capacity of Cebus monkey testes from birth to puberty.
  • To identify the predominant steroidogenic pathway and testosterone production dynamics.

Main Methods:

  • In vitro incubation of testicular tissue from Cebus monkeys at various developmental stages.
  • Measurement of key steroid hormones (pregnenolone, dehydroepiandrosterone, progesterone, androstenedione, testosterone, dihydrotestosterone) using RIA.
  • Analysis of steroidogenic pathway preference and Leydig cell function.

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Main Results:

  • Cebus monkey testes exhibited testosterone production in vitro without exogenous gonadotropins at all ages.
  • Testosterone and delta-5 precursors (pregnenolone, dehydroepiandrosterone) were the primary steroids in testicular tissue.
  • Testosterone content per Leydig cell increased with age, with maximal testicular concentration at early puberty.

Conclusions:

  • The Cebus monkey utilizes a predominantly delta-5 pathway for testosterone synthesis.
  • Testicular steroidogenesis is active from birth, with Leydig cell capacity increasing through puberty.