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Dihydrotestosterone affects the growth of hormone-unresponsive breast cancer cells: an indirect action

M Di Monaco1, L Leonardi, V Gatto

  • 1Department of Clinical Pathophysiology, University of Turin, Torino, Italy.

Anticancer Research
|November 1, 1995
PubMed

Insights

Dihydrotestosterone (DHT) stimulates androgen-responsive breast cancer cells to release a growth-inhibiting factor. This peptide factor affects hormone-unresponsive cells, revealing a novel mechanism in cell-to-cell communication in breast cancer.

Area of Science:

  • Endocrinology
  • Cancer Biology
  • Cell Biology

Background:

  • Cell-to-cell interactions are vital for breast cancer progression.
  • Steroid hormones may modulate these interactions.
  • Androgen signaling in breast cancer is an area of ongoing research.

Purpose of the Study:

  • To investigate the effect of dihydrotestosterone (DHT) on interactions between steroid receptor-positive (MCF-7) and steroid receptor-negative (MDA-MB-231) breast cancer cell lines.
  • To determine if DHT influences the production of factors affecting hormone-unresponsive breast cancer cell growth.

Main Methods:

  • Utilized conditioned media from MCF-7 cells cultured with and without DHT and hydroxyflutamide.
  • Assessed the impact of conditioned media on MDA-MB-231 cell proliferation.
  • Investigated the role of peptide factors by treating conditioned media with trypsin.

Main Results:

  • Medium conditioned by MCF-7 cells with DHT inhibited MDA-MB-231 cell growth.
  • This inhibition was abolished by hydroxyflutamide or trypsin pretreatment of the conditioned medium.
  • DHT alone did not directly affect MDA-MB-231 cell growth.

Conclusions:

  • DHT stimulates androgen-responsive MCF-7 cells to secrete a peptide factor that inhibits hormone-unresponsive MDA-MB-231 cell growth.
  • This suggests a paracrine signaling mechanism mediated by DHT via the androgen receptor.
  • The findings highlight a novel role for androgens in regulating breast cancer cell communication and growth.

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