title: Treatment of Peyronie's disease with PDE5 inhibitors: an antifibrotic strategy.
abstract: Peyronie's disease (PD) is a localized fibrotic condition of the tunica albuginea that is associated with risk factors for corpora cavernosa fibrosis (such as advanced age and diabetes) and Dupuytren contracture, another localized fibrotic process. Most of the current pharmacological treatments for PD are not based on antifibrotic approaches that have shown promising results in animal models and clinical efficacy in other fibrotic conditions, which may explain why they are generally unsuccessful. Evidence gathered in human specimens and animal models of PD have elucidated aspects of its etiology and histopathology, showing that overexpression of transforming growth factor beta1, plasminogen activator inhibitor 1, reactive oxygen species and other profibrotic factors, which are, in most cases, assumed to be induced by trauma to the tunica albuginea, leads to myofibroblast accumulation and excessive deposition of collagen. At the same time, a steady overexpression of inducible nitric oxide synthase, leading to increased nitric oxide and cGMP levels, seems to act as an endogenous antifibrotic mechanism. This process has also been reported in corporal and cardiovascular fibrosis, and has led to the demonstration that long-term continuous administration of phosphodiesterase type 5 inhibitors counteracts the development of a PD-like fibrotic plaque in a rat model, and later extended to the prevention of corporal fibrosis in animal models of erectile dysfunction.
authors.affiliation: Department of Urology, David Geffen School of Medicine at UCLA, and Los Angeles Biomedical Research Institute (LABioMed) at Harbor-UCLA Medical Center, Building F-6, 1124 West Carson Street, Torrance, CA 90502, USA. smitshaun@msn.com
authors.forename: Nestor F
authors.initials: NF
authors.lastname: Gonzalez-Cadavid
authors.forename: Jacob
authors.initials: J
authors.lastname: Rajfer
mesh_terms: D000818:Animals; D054706:Cyclic Nucleotide Phosphodiesterases, Type 5 / Q000378:metabolism*; D005355:Fibrosis; D006801:Humans; D008297:Male; D010411:Penile Induration / Q000188:drug therapy* / Q000201:enzymology* / Q000473:pathology; D010413:Penis / Q000187:drug effects / Q000201:enzymology / Q000473:pathology*; D010726:Phosphodiesterase Inhibitors / Q000494:pharmacology / Q000627:therapeutic use*; D015398:Signal Transduction / Q000187:drug effects / Q000502:physiology; D016896:Treatment Outcome
chemical_list: D010726:Phosphodiesterase Inhibitors; D054706:Cyclic Nucleotide Phosphodiesterases, Type 5