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Nuclear hormone receptor NR4A2 is involved in cell transformation and apoptosis

Ning Ke1, Gisela Claassen, De-Hua Yu

  • 1Immusol, Inc., San Diego, California 92121, USA.

Cancer Research
|November 19, 2004
PubMed

Insights

The NR4A orphan nuclear receptor subfamily, including NR4A1 and NR4A2, acts as an oncogene by promoting cancer cell proliferation and suppressing apoptosis. Down-regulation of these receptors in cancer cells can inhibit tumor growth.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Cell Biology

Background:

  • HeLaHF cells, derived from cervical cancer cells, exhibit reduced anchorage-independent growth and tumorigenicity.
  • Previous studies suggested tumor suppressor activation in these revertant cells.
  • Identification of down-regulated oncogenes in HeLaHF cells is crucial for understanding cancer progression.

Purpose of the Study:

  • To identify potential oncogenes down-regulated in HeLaHF cells using expression profiling.
  • To investigate the role of the NR4A orphan nuclear receptor subfamily in cancer phenotypes.
  • To evaluate NR4A1 and NR4A2 as potential therapeutic targets in cancer treatment.

Main Methods:

  • Expression profiling analysis of HeLaHF cells.
  • Small interfering RNA (siRNA)-mediated down-regulation of NR4A2 in HeLa cells.
  • Assessment of anchorage-independent growth and anoikis.
  • Induction of intrinsic apoptosis assays.

Main Results:

  • All three members of the NR4A1/Nur77/NGFIB subfamily (NR4A1, NR4A2, NR4A3) were found to be down-regulated in HeLaHF cells.
  • Down-regulation of NR4A2 in HeLa cells reduced anchorage-independent growth and increased anoikis.
  • Down-regulation of NR4A1 and NR4A2 promoted intrinsic apoptosis in cancer cells.

Conclusions:

  • The NR4A1/Nur77/NGFIB subfamily of orphan receptors possesses oncogenic properties related to cell proliferation and apoptosis suppression.
  • NR4A1 and NR4A2 demonstrate potential as therapeutic targets for cancer treatment.
  • The observed apoptosis suppression by NR4A1 and NR4A2 is a general property applicable to various cancer types.

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