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Updated: Jun 25, 2026

Primary Culture of Rat Adrenocortical Cells and Assays of Steroidogenic Functions
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11Beta-Hydroxysteroid Dehydrogenase Messenger Ribonucleic Acid Expression, Bioactivity and Immunoreactivity in Rat

M P Moisan1, J R Seckl, L P Brett

  • 1Department of Medicine, Western General Hospital, Edinburgh EH4 2XU, UK.

Journal of Neuroendocrinology
|February 14, 2009
PubMed
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11beta-Hydroxysteroid dehydrogenase (11beta-OHSD) in the cerebellum regulates corticosterone access to glucocorticoid receptors. This enzyme

Area of Science:

  • Neuroendocrinology
  • Steroid Metabolism

Background:

  • 11beta-Hydroxysteroid dehydrogenase (11beta-OHSD) inactivates glucocorticoids, protecting mineralocorticoid receptors.
  • The role of 11beta-OHSD in tissues with high glucocorticoid receptor (GR) and low mineralocorticoid receptor (MR) levels is less understood.

Purpose of the Study:

  • To investigate the presence and function of 11beta-OHSD in the cerebellum.
  • To determine if 11beta-OHSD regulates corticosterone access to GR in the cerebellum.

Main Methods:

  • Assessed 11beta-OHSD bioactivity in cerebellar extracts.
  • Analyzed co-substrate requirements and inhibition kinetics.
  • Detected 11beta-OHSD messenger RNA (mRNA) expression via RT-PCR.
  • Localized 11beta-OHSD protein using immunohistochemistry.

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Main Results:

  • Significant 11beta-OHSD bioactivity was detected in the cerebellum, similar to the kidney.
  • Enzyme kinetics and co-substrate requirements were comparable between cerebellar and renal 11beta-OHSD.
  • 11beta-OHSD mRNA was expressed in cerebellum, specifically in Purkinje and granule cells.
  • Immunohistochemistry confirmed 11beta-OHSD protein localization in these neuronal populations.

Conclusions:

  • 11beta-Hydroxysteroid dehydrogenase (11beta-OHSD) is present and active in the cerebellum.
  • Cerebellar 11beta-OHSD likely regulates corticosterone levels, influencing glucocorticoid receptor activity.
  • This finding extends the known roles of 11beta-OHSD beyond mineralocorticoid receptor protection.