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Translocator protein (18 kDa): an update on its function in steroidogenesis.

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  • 1Department of Pharmacology and Pharmaceutical Sciences, School of Pharmacy, University of Southern California, Los Angeles, CA, USA.

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Translocator protein (TSPO) is a vital mitochondrial protein involved in cholesterol transport and steroidogenesis. Recent genetic studies in mice challenge its established role, highlighting ongoing research into its complex functions.

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Area of Science:

  • Mitochondrial biology
  • Biochemistry
  • Pharmacology

Background:

  • Translocator protein (18 kDa) (TSPO) is a key mitochondrial protein.
  • TSPO participates in cholesterol transport, steroidogenesis, heme synthesis, and apoptosis.
  • Its role in steroidogenesis has been generally accepted until recent genetic studies.

Purpose of the Study:

  • To review the structure, function, and pharmacology of TSPO.
  • To discuss recent findings from genetic animal models that have created controversy.
  • To evaluate TSPO as a pharmacological target for diseases involving mitochondrial activity.

Main Methods:

  • Review of existing literature on TSPO structure and function.
  • Analysis of data from genetic depletion studies in mice.
  • Examination of TSPO's association with protein complexes in steroidogenic cells.

Main Results:

  • TSPO is localized to the outer mitochondrial membrane and participates in a multiprotein complex.
  • Genetic depletion studies have challenged the established role of TSPO in steroid and heme synthesis.
  • TSPO stimulation shows therapeutic potential for anxiety and hypogonadism.

Conclusions:

  • TSPO remains a significant mitochondrial protein with diverse functions.
  • Recent genetic evidence necessitates a re-evaluation of TSPO's precise role in steroidogenesis.
  • TSPO is a promising pharmacological target for conditions linked to increased mitochondrial activity.