(De)phosphorylation agents influence 5 alpha-reduction of testosterone in human prostate

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Phosphopeptide Analysis of Rodent Epididymal Spermatozoa
09:30

Phosphopeptide Analysis of Rodent Epididymal Spermatozoa

Published on: December 30, 2014

J M Le Goff1, P M Martin, J P Raynaud

  • 1Laboratoire de Cancérologie, Faculté de Médecine Nord, CNRS UA 1175, Marseille, France.

Endocrinology
|September 1, 1988
PubMed

Insights

The study found that 5 alpha-reductase activity in human prostate tissue is energy-dependent. Enzyme activity, crucial for dihydrotestosterone (DHT) production, is influenced by ATP and phosphorylation.

Area of Science:

  • Biochemistry
  • Urology
  • Endocrinology

Background:

  • 5 alpha-reductase is a key enzyme in androgen metabolism.
  • Dihydrotestosterone (DHT) plays a critical role in prostate physiology and pathology.
  • Benign prostatic hyperplasia (BPH) involves alterations in prostatic enzyme activity.

Purpose of the Study:

  • To investigate the influence of energy metabolism on 5 alpha-reductase kinetics.
  • To explore the role of adenosine triphosphate (ATP) and 2,4-dinitrophenol (DNP) in regulating 5 alpha-reductase activity.
  • To examine the relationship between 5 alpha-reductase activity and prostatic acid phosphatase (PAP) concentration.

Main Methods:

  • Microsomal preparation from hyperplastic human prostates.
  • Enzyme kinetic assays measuring 5 alpha-reductase activity.
  • Dose-response studies with ATP and DNP.
  • Correlation analysis with prostatic acid phosphatase (PAP) levels.

Main Results:

  • 2,4-dinitrophenol (DNP) inhibited 5 alpha-reductase activity in a dose-dependent manner.
  • Adenosine triphosphate (ATP) increased 5 alpha-reductase activity dose-dependently.
  • A significant inverse correlation was observed between 5 alpha-reductase activity and PAP concentration within the same prostate sample.

Conclusions:

  • Prostate 5 alpha-reductase activity and subsequent DHT production are likely energy-dependent processes.
  • Enzyme activity may involve a phosphorylation step, suggesting a regulatory mechanism.
  • These findings have implications for understanding BPH pathogenesis and potential therapeutic targets.

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