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Related Experiment Videos

Apoptotic versus proliferative activities in human benign prostatic hyperplasia

N Kyprianou1, H Tu, S C Jacobs

  • 1Division of Urology, Department of Surgery, University of Maryland School of Medicine, Baltimore, MD 21201, USA.

Human Pathology
|July 1, 1996
PubMed
Summary

Benign prostatic hyperplasia (BPH) involves decreased apoptosis and increased cell proliferation in the prostate. Enhanced expression of bcl-2 and transforming growth factor-beta1 (TGF-beta1) may disrupt normal cell death, promoting BPH growth.

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Area of Science:

  • Urology
  • Cell Biology
  • Molecular Pathology

Background:

  • Normal prostate growth relies on a balance between programmed cell death (apoptosis) and cell proliferation.
  • Disruptions in these regulatory mechanisms can lead to abnormal prostate growth, such as benign prostatic hyperplasia (BPH).
  • Key proteins like transforming growth factor-beta1 (TGF-beta1) and bcl-2 play critical roles in regulating prostate apoptosis.

Purpose of the Study:

  • To comparatively analyze apoptosis and cell proliferation in normal and benign hyperplastic human prostate tissues.
  • To examine the expression levels of TGF-beta1 and bcl-2 in relation to prostate growth and apoptosis.

Main Methods:

  • Apoptosis was detected using terminal transferase staining for DNA fragmentation.
  • Cell proliferation was assessed by Ki-67 nuclear antigen staining.

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  • Protein expression of TGF-beta1 and bcl-2 was evaluated using immunohistochemistry.

    • Main Results:

    • The apoptotic index was higher in normal prostate tissue compared to BPH tissue.
    • The proliferative index was significantly increased in hyperplastic prostate tissue.
    • There was a fourfold decrease in cell death in BPH compared to normal prostate, with elevated TGF-beta1 and bcl-2 expression in BPH.

    Conclusions:

    • Benign prostatic hyperplasia is characterized by a significant decrease in apoptosis and an increase in cell proliferation.
    • Enhanced expression of the anti-apoptosis protein bcl-2 and elevated TGF-beta1 may contribute to the deregulation of cell death mechanisms in BPH.
    • These molecular changes likely promote an imbalance favoring cell proliferation, ultimately contributing to the development of prostatic hyperplasia.