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Intracavernosal Pressure Recording to Evaluate Erectile Function in Rodents
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Mechanistic link between erectile dysfunction and systemic endothelial dysfunction in type 2 diabetic rats.

B Musicki1, J L Hannan2, G Lagoda1

  • 1Department of Urology, The Johns Hopkins School of Medicine, The James Buchanan Brady Urological Institute, Baltimore, MD, USA.

Andrology
|May 7, 2016
PubMed
Summary
This summary is machine-generated.

Erectile dysfunction (ED) in type 2 diabetes mellitus (T2DM) stems from early penile redox imbalance and endothelial nitric oxide synthase (eNOS) dysfunction. These molecular changes precede systemic vascular issues, highlighting the penis as an early target in diabetic complications.

Keywords:
NADPH oxidaseS-glutathionylationcarotid arteryendothelial nitric oxidase synthase uncouplingoxidative stresspenis

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Area of Science:

  • Endocrinology and Metabolism
  • Urology
  • Cardiovascular Research

Background:

  • Men with type 2 diabetes mellitus (T2DM) and erectile dysfunction (ED) face increased cardiovascular event risk.
  • ED is a potential predictor of cardiovascular events in diabetic men.
  • The molecular mechanisms of endothelial dysfunction in the diabetic penis remain unclear.

Purpose of the Study:

  • To investigate the temporal relationship between ED and endothelial dysfunction in T2DM.
  • To determine if redox imbalance and eNOS dysfunction occur earlier in the penis than in systemic vasculature.
  • To elucidate molecular mechanisms underlying penile endothelial dysfunction in T2DM.

Main Methods:

  • T2DM induced in rats via high-fat diet and streptozotocin.
  • Assessment of erectile function (intracavernosal pressure) and NANC-mediated cavernosal relaxation.
  • Molecular analysis of penile and carotid artery tissues for eNOS uncoupling, oxidative stress markers (4-HNE), NADPH oxidase (gp91(phox)), and S-glutathionylation.

Main Results:

  • T2DM rats exhibited decreased erectile response and cavernosal relaxation.
  • Penile tissues showed increased oxidative stress (4-HNE), NADPH oxidase expression, eNOS uncoupling (monomerization), and S-glutathionylation.
  • Systemic vasculature (carotid artery) showed preserved endothelium-dependent vasodilation and no significant molecular changes.

Conclusions:

  • Redox imbalance, NADPH oxidase-driven oxidative stress, and eNOS uncoupling occur early in the diabetic penis.
  • These penile molecular changes contribute to T2DM-associated ED.
  • Systemic vascular function remains preserved while penile endothelial dysfunction develops early in T2DM.