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Genistein induces G2 arrest in malignant B cells by decreasing IL-10 secretion

Amal Mansour1, Brian McCarthy, Stephan K Schwander

  • 1New Jersey Medical School, UMDNJ, Newark, New Jersey 07103, USA.

Cell Cycle (Georgetown, Tex.)
|December 22, 2004
PubMed

Insights

The soy isoflavone genistein inhibits B cell malignancy growth by reducing IL-10 and arresting cell cycles. Genistein also sensitizes these cancer cells to chemotherapy, offering new therapeutic strategies.

Area of Science:

  • Oncology
  • Immunology
  • Molecular Biology

Background:

  • Chronic B cell malignancies often exhibit chemoresistance, necessitating novel therapeutic approaches.
  • Interleukin-10 (IL-10) plays a crucial role in regulating B cell growth and differentiation, and is often autocrinely produced in B cell malignancies.
  • Tyrosine kinase inhibitors are being explored for their therapeutic potential in cancer treatment.

Purpose of the Study:

  • To investigate the effects of the soy isoflavone genistein on IL-10 secretion and cell proliferation in chronic B cell malignancies.
  • To elucidate the mechanisms by which genistein affects cell cycle progression and apoptosis in these cancer cells.
  • To evaluate genistein's potential to sensitize malignant B cells to conventional chemotherapeutic agents.

Main Methods:

  • Treatment of B cell malignancy models with genistein.
  • Measurement of IL-10 and Interferon-gamma (IFN-gamma) levels.
  • Analysis of cell proliferation and cell cycle distribution (G2 arrest).
  • Assessment of apoptosis and expression of cell cycle regulatory proteins (cdc25C, cdk1) and anti-apoptotic proteins (survivin, Ian-5).
  • Combination studies with exogenous IL-10 and fludarabine.

Main Results:

  • Genistein treatment rapidly decreased IL-10 secretion and inhibited cell proliferation, inducing G2 cell cycle arrest.
  • The antiproliferative effects of genistein were reversed by exogenous IL-10.
  • Genistein downregulated key cell cycle proteins (cdc25C, cdk1) and anti-apoptotic proteins (survivin, Ian-5).
  • Upon genistein withdrawal, arrested cells re-entered the cell cycle and underwent apoptosis, an effect significantly enhanced by fludarabine.

Conclusions:

  • Genistein demonstrates significant antiproliferative activity against chronic B cell malignancies by modulating cytokine profiles and cell cycle progression.
  • Genistein can sensitize malignant B cells to chemotherapy, such as fludarabine, by controlling cell cycle arrest and promoting apoptosis.
  • These findings suggest genistein as a potential therapeutic agent or sensitizer in the treatment of chemoresistant B cell malignancies.

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