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Related Experiment Videos

Adrenarche in the rat.

Duarte Pignatelli1, Fang Xiao, Alexandra M Gouveia

  • 1Laboratório de Biologia Celular e Molecular da Faculdade de Medicina da Universidade do Porto and IBMC, Alameda Hernani Monteiro, 4200-319 Porto, Portugal. dpignatelli@yahoo.com

The Journal of Endocrinology
|October 27, 2006
PubMed
Summary

Rat adrenal glands show increased activity of 17-hydroxylase (CYP17) before puberty, suggesting a role in adrenarche, similar to humans. This adrenal development precedes gonadal activation in young rats.

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Area of Science:

  • Endocrinology
  • Comparative Physiology
  • Developmental Biology

Background:

  • Human pubertal development involves adrenarche and gonadarche.
  • Adrenarche is linked to increased adrenal 17-hydroxylase (CYP17) activity.
  • Rat CYP17 expression is thought to be low, questioning adrenal roles in rat puberty.

Purpose of the Study:

  • To investigate postnatal adrenal development in rats.
  • To determine if rat adrenals exhibit CYP17 activity before puberty.
  • To explore potential similarities between rat and human adrenarche.

Main Methods:

  • Collected plasma and adrenal tissues from rats aged 2-90 days.
  • Assayed circulating adrenal steroids and quantitatively assessed adrenal zones.
  • Used quantitative reverse transcriptase PCR to measure CYP17 mRNA levels.

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Main Results:

  • Observed a zona reticularis increase and peaks in cortisol, androstenedione, and 17-OH-progesterone around postnatal days 16-20.
  • These adrenal changes occurred before gonadal development (starting at 30-35 days).
  • Confirmed a peak in CYP17 mRNA in adrenal tissue from similarly aged rats.

Conclusions:

  • The rat adrenal gland can secrete steroids via 17-hydroxylation.
  • This adrenal activity may contribute to a process analogous to human adrenarche.
  • Suggests a potential role for adrenal development in initiating puberty in rats.