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Related Experiment Videos

Androgens regulate phosphodiesterase type 5 expression and functional activity in corpora cavernosa.

Annamaria Morelli1, Sandra Filippi, Rosa Mancina

  • 1Andrology Unit, Department of Clinical Physiopathology, University of Florence, Florence 50139, Italy.

Endocrinology
|February 7, 2004
PubMed
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Androgens significantly increase phosphodiesterase type 5 (PDE5) expression and function in the male reproductive tract. This explains higher PDE5 levels in males and impacts its role in erectile function.

Area of Science:

  • Reproductive Biology
  • Molecular Endocrinology
  • Urology

Background:

  • Phosphodiesterase type 5 (PDE5) is crucial for regulating cyclic guanosine monophosphate (cGMP) levels, impacting smooth muscle relaxation.
  • PDE5 abundance and activity are known to differ between sexes, but the regulatory mechanisms remain unclear.
  • Androgens are primary male sex hormones with diverse physiological roles, including potential influence on reproductive tissue function.

Purpose of the Study:

  • To investigate the role of androgens in regulating PDE5 expression and function in the male reproductive tract.
  • To determine if testosterone influences PDE5 levels and its pharmacological response in corpora cavernosa (CC).
  • To explore the impact of hormonal milieu on PDE5 activity and sensitivity to PDE5 inhibitors.

Main Methods:

Related Experiment Videos

  • Real-time RT-PCR and Western blot analysis to quantify PDE5 mRNA and protein levels.
  • Immunohistochemistry to localize PDE5 protein within CC tissues.
  • Pharmacological studies using isolated rabbit CC strips to assess PDE5 inhibitor (sildenafil) and nitric oxide (NO) donor (NCX4040) effects under varying hormonal conditions (hypogonadism, testosterone supplementation).
  • Analysis of PDE5 expression and activity in human CC from male-to-female transsexual individuals on hormone therapy.

Main Results:

  • PDE5 mRNA and protein were significantly higher in human male reproductive tracts, particularly in CC, compared to females.
  • In a rabbit hypogonadism model, testosterone (T) supplementation restored reduced CC PDE5 expression and enhanced cGMP conversion.
  • T supplementation improved sildenafil's efficacy in promoting CC relaxation and enhanced responsiveness to NO donors, suggesting androgen-mediated PDE5 upregulation.
  • Human CC from individuals on estrogen and cyproterone acetate showed reduced PDE5 mRNA, protein, and functional activity compared to controls.

Conclusions:

  • Androgens positively regulate PDE5 gene and protein expression in the male reproductive tract.
  • This androgenic regulation of PDE5 contributes to the higher abundance of the enzyme in males.
  • The findings provide a molecular basis for understanding sex-based differences in PDE5 function and response to therapies targeting the PDE5 pathway.