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Developmental changes in rat renal 11 beta-hydroxysteroid dehydrogenase

A S Brem1, B Bina, K L Matheson

  • 1Division of Pediatric Nephrology, Rhode Island Hospital, Providence.

Kidney International
|March 1, 1994
PubMed
Summary

This study examined how the enzyme 11 beta-hydroxysteroid dehydrogenase (11 beta-OHSD) changes in rat kidneys during development. Researchers found that enzyme activity is lower in newborn rats compared to 8-day-olds and adults. This enzyme converts glucocorticoids into inactive forms, and lower activity allows more sodium to be retained, which supports growth. Immunofluorescence staining showed that enzyme presence is minimal in newborns but strong in adult kidneys. Kinetic tests revealed that newborns have lower enzyme efficiency. These findings suggest that enzyme activity increases with age, helping regulate sodium balance in mature kidneys.

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Area of Science:

  • Renal physiology
  • Endocrinology
  • Developmental biology

Background:

Glucocorticoids influence kidney function by regulating sodium balance. An enzyme called 11 beta-hydroxysteroid dehydrogenase (11 beta-OHSD) converts these hormones into inactive forms. Low enzyme activity increases sodium retention, which supports growth in early life. Prior research has shown that sodium balance is crucial for neonatal development. However, the developmental regulation of 11 beta-OHSD in the kidney remains unclear. This uncertainty drove the need to examine enzyme activity across different ages. Researchers have not yet resolved how enzyme levels change from birth to maturity. The role of 11 beta-OHSD in neonatal kidney function is not fully understood. This gap motivated a study to measure enzyme activity in newborn, 8-day-old, and adult rats. Understanding these patterns could clarify how sodium balance is managed during early development.

Purpose Of The Study:

The study aimed to determine how 11 beta-OHSD activity changes in rat kidneys during development. Researchers wanted to test the hypothesis that enzyme levels are low in newborns. They focused on the postnatal period, a time of rapid growth. Sodium retention is necessary for this growth, and low enzyme activity may support it. The team compared enzyme activity in newborn, 8-day-old, and adult rats. They used corticosterone incubations to measure transformation rates. Immunofluorescence staining was also used to detect enzyme presence. The goal was to link enzyme activity with developmental changes in kidney function.

Keywords:
11 beta-hydroxysteroid dehydrogenaserenal sodium retentionenzyme activityneonatal kidney function

Frequently Asked Questions

The study found that 11 beta-OHSD activity increases with age in rat kidneys, with newborns showing significantly lower activity than adults.

They measured the percent of corticosterone converted to compound A in kidney minces and homogenates from newborn, 8-day-old, and adult rats.

Immunofluorescence was used to detect the presence and localization of 11 beta-OHSD in different kidney regions across age groups.

The higher apparent Km in newborns suggests lower enzyme efficiency in converting corticosterone compared to adults.

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Main Methods:

The researchers measured 11 beta-OHSD activity in rat kidney tissues. They used corticosterone incubations with kidney minces and homogenates. Tissue samples came from newborn, 8-day-old, and adult Sprague-Dawley rats. The percent of corticosterone converted to compound A was recorded. Enzyme activity was calculated from these transformation rates. Immunofluorescence staining was applied to detect enzyme localization. An antibody against liver 11 beta-OHSD was used for staining. Kinetic parameters like Km and Vmax were determined in homogenates.

Main Results:

Newborn rat kidneys had significantly lower 11 beta-OHSD activity than 8-day-old and adult kidneys. Corticosterone transformation was 45.7% in newborns, 70.2% in 8-day-olds, and 73.4% in adults. Immunofluorescence showed strong staining in adult proximal tubules. Staining was weak in newborn and 8-day-old kidneys. Enzyme kinetics revealed a higher apparent Km in newborns (12.8 x 10^-8 M) than in adults (4.42 x 10^-6 M). The Vmax was also lower in newborns (2.08 x 10^-11 mol/min/mg) compared to adults (1.33 x 10^-9 mol/min/mg). These findings suggest lower enzyme efficiency in newborns. The data support the hypothesis that enzyme activity increases with age.

Conclusions:

The study found that 11 beta-OHSD activity in rat kidneys increases with age. Newborns had significantly lower enzyme activity than 8-day-olds and adults. This supports the hypothesis that low enzyme activity aids sodium retention in early life. Immunofluorescence staining confirmed enzyme presence in adult proximal tubules. Staining was minimal in younger rats, suggesting delayed enzyme maturation. Kinetic data showed lower efficiency in newborns compared to adults. These results align with the need for sodium balance in neonatal growth. The authors propose that enzyme activity rises to regulate mineralocorticoid effects in mature kidneys.

Failed At:

2026-07-14T07:53:33.817138+00:00

The Vmax reflects the maximum rate of corticosterone conversion, which was lower in newborns than in adults.

The authors propose that low enzyme activity in newborns supports sodium retention, which is necessary for growth.