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Related Experiment Videos

Systemic sclerosis and impotence: a clinicopathological correlation

A Nehra1, S J Hall, G Basile

  • 1Department of Urology, Boston University School of Medicine, Massachusetts.

The Journal of Urology
|April 1, 1995
PubMed
Summary

Systemic sclerosis causes impotence through excessive fibrosis in erectile tissue, leading to veno-occlusive dysfunction and reduced penile length. This occurs as smooth muscle cells shift from a contractile to a synthetic state, increasing extracellular matrix accumulation.

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Area of Science:

  • Urology
  • Pathology
  • Biomedical Engineering

Background:

  • Systemic sclerosis is a connective tissue disease that can affect multiple organs, including the erectile tissues of the penis.
  • Erectile dysfunction is a common complication in men with systemic sclerosis, but its underlying mechanisms are not fully understood.

Observation:

  • A clinicopathological correlation was performed between erectile function tests and pathological examination of penile tissue in an impotent patient with systemic sclerosis.
  • Preoperative testing showed firm corporeal tissue with limited penile stretch. Pharmacocavernosometry revealed severe veno-occlusive dysfunction.
  • Surgical implantation required sharp excision of compact erectile tissue, which was unable to dilate.

Findings:

  • Histological examination revealed severe corporeal fibrosis, with a significantly reduced trabecular smooth muscle area (18.2%) compared to normal (40-52%).

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  • Immunohistochemistry confirmed extensive fibrosis, and in situ hybridization showed increased collagen and fibronectin mRNA expression in mesenchymal cells, including smooth muscle cells.
  • These findings suggest that trabecular smooth muscle cells adopt a synthetic phenotype, contributing to excessive extracellular matrix accumulation.

    • Implications:

    • The study proposes a mechanism for systemic sclerosis-associated impotence, linking veno-occlusive dysfunction and penile shortening to fibrosis and altered smooth muscle cell activity.
    • Understanding this mechanism may lead to targeted therapies for erectile dysfunction in patients with systemic sclerosis.
    • Further research into the phenotypic modulation of smooth muscle cells in fibrotic conditions is warranted.