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BOR - Papers in Press, published online ahead of print July 7, 2004.
Biol Reprod 2004, 10.1095/biolreprod.104.030833
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BIOLOGY OF REPRODUCTION 71, 1568–1577 (2004)
DOI: 10.1095/biolreprod.104.030833
© 2004 by the Society for the Study of Reproduction, Inc.

Reproductive Technology

Gene Transfer of Inducible Nitric Oxide Synthase Complementary DNA Regresses the Fibrotic Plaque in an Animal Model of Peyronie's Disease1

Hugo H. Davila3,4, Thomas R. Magee3,4, Dolores Vernet4, Jacob Rajfer3,4, and Nestor F. Gonzalez-Cadavid2,3,4

Department of Urology,3 UCLA School of Medicine, Los Angeles, California 90095 Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center,4 Division of Urology, Torrance, California 90502

The goal of the present study was to investigate the antifibrotic role of inducible nitric oxide synthase (iNOS) in Peyronie's disease (PD) by determining whether a plasmid expressing iNOS (piNOS) injected into a PD-like plaque can induce regression of the plaque. A PD-like plaque was induced with fibrin in the penile tunica albuginea of mice and then injected with a luciferase-expressing plasmid (pLuc), either alone or with piNOS, following luciferase expression in vivo by bioluminescence imaging. Rats were treated with either piNOS, an empty control plasmid (pC), or saline. Other groups were treated with pC or piNOS, in the absence of fibrin. Tissue sections were stained for collagen, transforming growth factor (TGF) ß1, and plasminogen-activator inhibitor (PAI-1) as profibrotic factors; copper-zinc superoxide dismutase (CuZn SOD) as scavenger of reactive oxygen species (ROS); and nitrotyrosine to detect nitric oxide reaction with ROS. Quantitative image analysis was applied. Both iNOS and xanthine oxido-reductase (XOR; oxidative stress) were estimated by Western blot analysis. Luciferase reporter expression was restricted to the penis, peaked at 3 days after injection, but continued for at least 3 wk. In rats receiving piNOS, iNOS expression also peaked at 3 days, but expression decreased at the end of treatment, when a considerable reduction of plaque size occurred. Protein nitrotyrosine, XOR, and CuZn SOD increased, and TGFß1 and PAI-1 decreased. The piNOS gene transfer regressed the PD plaque and expression of profibrotic factors, supporting the view that endogenous iNOS induction in PD is defense mechanism by the tissue against fibrosis.

1 Supported by NIH grants R01DK-53069 and G12RR-03026, the Edythe and Eli Broad Foundation, and the Peter Morton Foundation.

2 Correspondence: Nestor F. Gonzalez-Cadavid, Harbor-UCLA Medical Center, Urology, Bldg. F-6, 1124 West Carson Street, Torrance, CA 90502. FAX: 310 222 1914; ncadavid{at}ucla.edu






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Copyright © 2004 by the Society for the Study of Reproduction.