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Related Experiment Videos

The cofactor effect: varicocele and infertility.

B C Peng1, P Tomashefsky, H M Nagler

  • 1Department of Urology, College of Physicians and Surgeons, Columbia University, New York, New York.

Fertility and Sterility
|July 1, 1990
PubMed
Summary
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Varicocele may contribute to male infertility by acting as a cofactor, especially when combined with gonadotoxins like nicotine. This study supports the cofactor hypothesis in varicocele pathophysiology.

Area of Science:

  • Reproductive biology
  • Urology
  • Toxicology

Background:

  • Varicocele is a common cause of male infertility with unpredictable effects.
  • The pathophysiology of varicocele-induced infertility is not fully understood.
  • A cofactor hypothesis suggests varicocele potentiates other factors to cause infertility.

Purpose of the Study:

  • To investigate the role of varicocele as a cofactor in male infertility.
  • To assess the combined effects of varicocele and gonadotoxins on spermatogenesis.
  • To test the cofactor hypothesis of varicocele pathophysiology.

Main Methods:

  • Male rats were assigned to experimental varicocele, sham surgery, or control groups.
  • Animals were treated with cyclophosphamide or nicotine (gonadotoxins) for 30 days.

Related Experiment Videos

  • Spermatogenesis was quantitatively assessed using flow cytometry.

    • Main Results:

    • Cyclophosphamide induced gonadotoxicity, exacerbated by varicocele or sham surgery.
    • Nicotine combined with varicocele demonstrated greater gonadotoxicity than either alone.
    • The synergistic effect of varicocele and nicotine supports the cofactor hypothesis.

    Conclusions:

    • Varicocele may act as a cofactor, potentiating the effects of gonadotoxins.
    • The combination of varicocele and certain gonadotoxins significantly impairs spermatogenesis.
    • Findings support the cofactor hypothesis in the context of varicocele-related male infertility.