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Related Experiment Videos

Elevated testosterone induces apoptosis in neuronal cells.

Manuel Estrada1, Anurag Varshney, Barbara E Ehrlich

  • 1Department of Pharmacology and Cellular and Molecular Physiology, Yale University, New Haven, Connecticut 06520, USA.iestrada@med.uchile.cl

The Journal of Biological Chemistry
|June 29, 2006
PubMed
Summary
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Supraphysiological testosterone levels initiate neuronal apoptosis via inositol 1,4,5-trisphosphate receptor type 1-mediated calcium signaling. This testosterone-induced cell death and altered calcium patterns have long-term effects on brain function.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Endocrinology

Background:

  • Testosterone is vital for neuronal function, but excessive levels can be harmful.
  • Understanding the mechanisms behind testosterone's neurotoxic effects is crucial.

Purpose of the Study:

  • To investigate how supraphysiological testosterone concentrations affect neuronal apoptosis.
  • To elucidate the role of calcium signaling and specific receptors in testosterone-induced neurotoxicity.

Main Methods:

  • Assessed apoptosis using annexin V labeling, caspase activity, and DNA fragmentation assays.
  • Measured intracellular calcium (Ca2+) signaling patterns at varying testosterone concentrations.
  • Utilized caspase inhibitors, inositol 1,4,5-trisphosphate receptor (InsP3R) blockers, and small interfering RNA (siRNA) for InsP3R knockdown.

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Main Results:

  • Micromolar, but not nanomolar, testosterone concentrations triggered apoptosis.
  • High testosterone concentrations induced sustained Ca2+ increases, unlike low concentrations which caused oscillations.
  • Testosterone-induced cell death and altered Ca2+ signals were abolished by caspase inhibitors and InsP3R blockers.
  • Knockdown of InsP3R type 1, but not type 3, prevented testosterone-induced cell death and prolonged Ca2+ signals.

Conclusions:

  • Elevated testosterone initiates apoptotic cell death in neurons.
  • This process is mediated by altered inositol 1,4,5-trisphosphate receptor type 1-dependent intracellular calcium signaling.
  • These findings suggest testosterone-induced neurotoxicity has long-term implications for brain function.