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Inositol hexakisphosphate kinase 2 mediates growth suppressive and apoptotic effects of interferon-beta in ovarian

B H Morrison1, J A Bauer, D V Kalvakolanu

  • 1Department of Cancer Biology, Lerner Research Institute, Center for Cancer Drug Development and Discovery, Cleveland Clinic Foundation, Cleveland, OH 44195, USA.

The Journal of Biological Chemistry
|May 5, 2001
PubMed

Insights

Interferon-beta (IFN-beta) triggers apoptosis in ovarian cancer cells by upregulating inositol hexakisphosphate kinase 2 (IP6K2). This discovery reveals a new role for IP6K2 in regulating cell death.

Area of Science:

  • Oncology
  • Molecular Biology
  • Immunology

Background:

  • Interferons (IFNs) are crucial regulators of cellular responses, including antiviral, antitumor, and immune functions.
  • IFN-beta has demonstrated efficacy in suppressing ovarian carcinoma growth and inducing apoptosis.
  • Understanding the molecular mechanisms behind IFN-beta-induced apoptosis is critical for therapeutic development.

Purpose of the Study:

  • To elucidate the molecular mechanisms underlying IFN-beta-induced apoptosis in ovarian cancer cells.
  • To identify and characterize novel gene products, termed regulators of interferon-induced death (RIDs), involved in this process.
  • To specifically investigate the role of RID-2 in IFN-beta-mediated cell death.

Main Methods:

  • Antisense technical knockout approach to identify RIDs.
  • Sequence analysis to identify the gene product corresponding to RID-2.
  • In vitro studies using ovarian carcinoma cell lines.
  • Generation and testing of a mutant IP6K2 to assess its function in apoptosis.

Main Results:

  • Several RIDs were isolated, with RID-2 being further characterized.
  • Sequence analysis confirmed RID-2 is identical to human inositol hexakisphosphate kinase 2 (IP6K2).
  • IP6K2 expression is post-transcriptionally induced by IFN-beta in ovarian carcinoma cells.
  • A mutant IP6K2, lacking functional inositol phosphate binding, abolished IFN-beta-induced apoptosis.

Conclusions:

  • Inositol hexakisphosphate kinase 2 (IP6K2) is a key mediator of IFN-beta-induced apoptosis in ovarian cancer.
  • IP6K2 plays a novel role in the regulation of cell growth and apoptosis.
  • These findings identify IP6K2 as a potential therapeutic target for ovarian cancer treatment.

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