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Hydroxysteroid sulfotransferase 2B1b expression and localization in normal human brain.

Emily D Salman1, Ona Faye-Petersen2, Charles N Falany1

  • 1Department of Pharmacology and Toxicology, University of Alabama at Birmingham, Birmingham, AL, USA.

Hormone Molecular Biology and Clinical Investigation
|April 1, 2014
PubMed
Summary

The sulfotransferase SULT2B1b is the primary enzyme for steroid sulfonation in the human brain, including neurosteroids and cholesterol. Its expression in neurons and oligodendrocytes suggests a key role in brain sterol metabolism.

Keywords:
brainglioblastomahumanliver X receptorsulfotransferasesulfotransferase (SULT) 2B1b

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Area of Science:

  • Neuroscience
  • Biochemistry
  • Molecular Biology

Background:

  • Steroid sulfonation pathways in the human brain remain largely uncharacterized.
  • Key sulfotransferase (SULT) isoforms involved in human steroid conjugation include SULT1E1, SULT2A1, and SULT2B1b.

Purpose of the Study:

  • To investigate the expression and localization of SULT isoforms in the human brain.
  • To determine the primary enzyme responsible for steroid sulfonation in the brain.
  • To explore the regulation of SULT2B1b by liver X receptor (LXR) in glioblastoma cells.

Main Methods:

  • Analysis of SULT mRNA and protein expression in adult and fetal human brain sections using immunohistochemistry.
  • Detection of SULT and LXR expression in human U373-MG glioblastoma cells.
  • Investigation of LXR-β activation effects on SULT2B1b protein levels.

Main Results:

  • SULT2B1b mRNA and protein were detected in adult and fetal human brain, specifically in neurons and oligodendrocytes.
  • SULT1E1 and SULT2A1 expression were not detected in human brain sections.
  • SULT2B1b was also found in U373-MG glioblastoma cells, with its expression decreasing upon LXR-β activation.

Conclusions:

  • SULT2B1b is the principal enzyme catalyzing the sulfonation of neurosteroids, cholesterol, and oxysterols in the human brain.
  • The findings suggest a role for SULT2B1b in regulating brain sterol metabolism, potentially modulated by LXR signaling.
  • Further research into SULT2B1b is crucial for understanding steroid conjugation in the brain.