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Related Experiment Video

Updated: Jun 4, 2026

Intracavernosal Pressure Recording to Evaluate Erectile Function in Rodents

Intracavernosal Pressure Recording to Evaluate Erectile Function in Rodents

Published on: June 6, 2018

eNOS-uncoupling in age-related erectile dysfunction.

J M Johnson¹, T J Bivalacqua, G A Lagoda

¹Department of Urology, The Johns Hopkins University, Baltimore, MD 21287, USA.

International Journal of Impotence Research

|February 4, 2011

Summary

This summary is machine-generated.

Aging impairs erectile function due to increased oxidative stress and endothelial dysfunction. Tetrahydrobiopterin (BH(4)) improved function in aged rats by reducing oxidative stress, but not endothelial nitric oxide synthase (eNOS) uncoupling.

Related Experiment Videos

Last Updated: Jun 4, 2026

Intracavernosal Pressure Recording to Evaluate Erectile Function in Rodents

Intracavernosal Pressure Recording to Evaluate Erectile Function in Rodents

Published on: June 6, 2018

Area of Science:

Urology
Gerontology
Molecular Biology

Background:

Aging is linked to erectile dysfunction (ED), often attributed to oxidative stress and endothelial dysfunction.
The precise molecular mechanisms of age-related ED require further elucidation.

Purpose of the Study:

To investigate if endothelial nitric oxide synthase (eNOS) uncoupling contributes to ED in aged rats.
To assess the impact of tetrahydrobiopterin (BH(4)) supplementation on erectile function in aged rats.

Main Methods:

Erectile function was evaluated in young and aged Fischer 344 rats.
Rats received sepiapterin (a BH(4) precursor) or vehicle, followed by cavernous nerve stimulation.
Penile tissues were analyzed for eNOS uncoupling and oxidative stress markers (TBARS).

Main Results:

Aged rats exhibited reduced erectile response, increased eNOS uncoupling, and elevated TBARS compared to young rats.
Sepiapterin treatment improved erectile function and reduced TBARS in aged rats.
Sepiapterin did not reverse eNOS uncoupling in the aged rat penis.

Conclusions:

Aging induces eNOS uncoupling in the rat penis, leading to increased oxidative stress and ED.
BH(4) replacement may ameliorate age-related ED by mitigating oxidative stress, independent of eNOS uncoupling.