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Related Experiment Videos

11 beta-Hydroxysteroid dehydrogenase in developing rat intestine

J Pácha1, I Miksík

  • 1Institute of Physiology, Czech Academy of Sciences, Prague, Czech Republic.

The Journal of Endocrinology
|March 1, 1996
PubMed
Summary

The enzyme 11 beta-hydroxysteroid dehydrogenase (11 beta-OHSD) activity differs between rat small and large intestines during development. Corticosteroids, not thyroid hormones, regulate this enzyme

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Area of Science:

  • Endocrinology
  • Developmental Biology
  • Gastroenterology

Background:

  • 11 beta-hydroxysteroid dehydrogenase (11 beta-OHSD) is crucial for regulating corticosteroid activity.
  • Its role in the developing intestine, particularly in relation to aldosterone-sensitive pathways, is not fully understood.
  • Understanding 11 beta-OHSD developmental patterns is key to explaining differential hormonal effects in the immature gut.

Purpose of the Study:

  • To investigate the distribution, developmental changes, and hormonal regulation of 11 beta-OHSD in rat intestinal segments.
  • To clarify the relationship between corticosterone levels, intestinal transport, and 11 beta-OHSD activity during weaning.
  • To determine the influence of corticosteroids and thyroid hormones on intestinal 11 beta-OHSD activity.

Main Methods:

  • Assessed 11 beta-OHSD activity in various rat intestinal segments (ileum, caecum, colon) across different postnatal ages.
  • Measured both dehydrogenase and reductase activities.
  • Investigated the effects of adrenalectomy, high-salt diet, dexamethasone, deoxycorticosterone acetate, and altered thyroid status on enzyme activity.

Main Results:

  • 11 beta-OHSD activity was high in the colon from birth, but low in the ileum during early life, peaking around 30 days.
  • No significant reductase activity was detected in any intestinal segment.
  • Corticosteroids (dexamethasone, deoxycorticosterone acetate) modulated 11 beta-OHSD activity in the ileum and colon, while thyroid hormones had no significant effect.

Conclusions:

  • Developmental patterns of 11 beta-OHSD differ between the small and large intestine, potentially facilitating distinct hormonal maturation effects.
  • Corticosteroids are key regulators of intestinal 11 beta-OHSD activity during development.
  • Thyroid hormones do not appear to influence intestinal 11 beta-OHSD activity in developing rats.

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