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MiTF regulates cellular response to reactive oxygen species through transcriptional regulation of APE-1/Ref-1

Feng Liu1, Yan Fu, Frank L Meyskens

  • 1Department of Medicine, Chao Family Comprehensive Cancer Center, Irvine School of Medicine, University of California, Orange, California 92868, USA. liufe@uci.edu

The Journal of Investigative Dermatology
|October 31, 2008
PubMed

Insights

Microphthalmia-associated transcription factor (MiTF) regulates melanoma cell survival under oxidative stress by controlling apurinic/apyrimidinic endonuclease (APE-1). MiTF boosts APE-1 levels, enhancing DNA repair and ROS resistance in melanoma cells.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Cell Biology

Background:

  • Microphthalmia-associated transcription factor (MiTF) is crucial for melanocyte survival and has an emerging role in carcinogenesis.
  • The precise mechanisms linking MiTF to melanoma development, particularly its role in cellular responses to oxidative stress, remain unclear.

Purpose of the Study:

  • To investigate the function of MiTF in regulating cellular responses to reactive oxygen species (ROS) in melanoma.
  • To elucidate the mechanism by which MiTF influences melanoma cell survival under oxidative stress.

Main Methods:

  • Classification of melanoma cells into MiTF-positive and -negative groups.
  • Assessment of apurinic/apyrimidinic endonuclease (APE-1/Ref-1) levels and its regulation by MiTF under ROS conditions.
  • Evaluation of cell viability under ROS stress using MTT and Trypan blue assays.
  • Functional rescue experiments involving APE-1 overexpression.

Main Results:

  • MiTF-positive melanoma cells exhibited higher accumulation of APE-1, a key enzyme in oxidative DNA damage repair.
  • MiTF was identified as a transcriptional regulator of APE-1, with MiTF knockdown reducing APE-1 levels and ROS-induced APE-1 expression.
  • MiTF-negative cells showed reduced survival under ROS stress compared to MiTF-positive cells.
  • Overexpression of APE-1 partially rescued ROS-induced cell death in MiTF-depleted cells.

Conclusions:

  • MiTF plays a significant role in regulating cellular responses to ROS in melanoma by controlling APE-1 expression.
  • This regulation of APE-1 by MiTF provides a potential mechanism for MiTF's involvement in melanoma carcinogenesis and survival.

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