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Nitric oxide-dependent apoptosis in ovarian carcinoma cell lines

J Rieder1, R Jahnke, M Schloesser

  • 1Department of Anesthesia and Critical Care Medicine, Department of Obstetrics and Gynecology, University of Innsbruck, Anichstrasse 35, 6020, Innsbruck, Austria.

Gynecologic Oncology
|June 28, 2001
PubMed
Abstract

Insights

Nitric oxide (NO) synthesis correlates with programmed cell death in ovarian carcinoma cells. Cytokine-induced NO production in OVCAR-3 and HOC-7 cells promoted apoptosis, suggesting a role for NO in cancer therapy.

Area of Science:

  • Oncology
  • Immunology
  • Molecular Biology

Background:

  • Ovarian carcinoma cell lines (OVCAR-3, HOC-7, 2774) exhibit distinct inducible nitric oxide synthase (iNOS) gene expression profiles.
  • Proinflammatory cytokines like interferon gamma (IFN-gamma), interleukin-1beta (IL-1beta), and tumor necrosis factor alpha (TNF-alpha) modulate iNOS expression.

Purpose of the Study:

  • To investigate the correlation between nitric oxide (NO) synthesis and programmed cell death (apoptosis) in ovarian carcinoma cell lines.
  • To determine the role of cytokine-induced NO in mediating apoptosis in these cells.

Main Methods:

  • Apoptosis was assessed using DNA fragmentation analysis.
  • Fluorescence-activated cell sorter (FACS) analysis was employed to quantify NO-dependent apoptosis.
  • The effect of the iNOS inhibitor aminoguanidine on apoptosis was evaluated.

Main Results:

  • NO formation in response to IFN-gamma, IL-1beta, and TNF-alpha correlated with programmed cell death.
  • OVCAR-3 cells showed the highest DNA fragmentation (34.17%), followed by HOC-7 (12.86%), with minimal fragmentation in 2774 cells (4.54%).
  • Aminoguanidine treatment suppressed cytokine-induced apoptosis in OVCAR-3 and HOC-7 cells.

Conclusions:

  • NO synthesis induced by specific cytokines is linked to the extent of apoptotic cell death in OVCAR-3 and HOC-7 ovarian carcinoma cells.
  • These findings suggest that NO plays a role in cytokine-mediated apoptosis in ovarian cancer.
  • The observed correlation may partially explain the therapeutic benefits of cytokine application in ovarian carcinoma patients.

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