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Intramitochondrial cholesterol transfer.

D M Stocco1

  • 1Department of Cell Biology and Biochemistry, Texas Tech University Health Sciences Center, Lubbock 79430, USA. doug.stocco@ttmc.ttuhsc.edu

Biochimica Et Biophysica Acta
|June 17, 2000
PubMed
Summary

The steroidogenic acute regulatory (StAR) protein is crucial for steroid hormone production by transferring cholesterol to the inner mitochondrial membrane. Its dysfunction causes congenital lipoid adrenal hyperplasia, highlighting its vital role in steroid biosynthesis.

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Area of Science:

  • Biochemistry
  • Endocrinology
  • Molecular Biology

Background:

  • Cholesterol is the essential precursor for all steroid hormones.
  • Steroid biosynthesis regulation involves a cycloheximide-sensitive factor mediating cholesterol transfer to the inner mitochondrial membrane.
  • The steroidogenic acute regulatory (StAR) protein is a key candidate for this regulatory factor.

Purpose of the Study:

  • To investigate the role of the steroidogenic acute regulatory (StAR) protein in cholesterol transport and steroid biosynthesis.
  • To elucidate the mechanism by which StAR regulates steroid production.

Main Methods:

  • Cloning and sequencing of the StAR cDNA.
  • Transient transfections to assess StAR protein function.
  • Analysis of StAR knockout mouse models and patients with congenital lipoid adrenal hyperplasia.

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Main Results:

  • StAR protein was identified as a novel protein.
  • StAR overexpression increased steroid production.
  • Mutations in the StAR gene lead to congenital lipoid adrenal hyperplasia, characterized by blocked cholesterol transfer and cellular cholesterol accumulation.
  • StAR knockout mice exhibit a similar phenotype to human patients.
  • Cholesterol transfer activity is localized to the C-terminal region of StAR.

Conclusions:

  • StAR protein is essential for mobilizing cholesterol to the inner mitochondrial membrane, acting as the acute regulator of steroid biosynthesis.
  • While StAR's role in cholesterol transfer is established, its precise mechanism of action requires further investigation.