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Suppressing the high-level expression and function of ATM in advanced-stage melanomas does not sensitize the cells to

Stergios J Moschos1, Nicole R Dodd, Drazen M Jukic

  • 1Department of Medicine, University of Pittsburgh, Pittsburgh, PA, USA.

Cancer Biology & Therapy
|August 18, 2009
PubMed

Insights

Advanced melanoma resists treatment, and while the Ataxia Telangiectasia Mutated (ATM) gene is highly expressed, it does not appear to be the key DNA damage sensor in these cells. Other genes likely regulate DNA repair in melanoma.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Advanced melanoma exhibits resistance to conventional therapies like chemotherapy and radiation.
  • The Ataxia Telangiectasia Mutated (ATM) gene was previously identified in melanoma tissues.
  • ATM plays a critical role in cellular responses to DNA damage.

Purpose of the Study:

  • To investigate the role of ATM in advanced-stage melanoma.
  • To determine if high ATM expression prevents apoptosis in response to DNA double-strand breaks (DSB).
  • To identify potential therapeutic targets for melanoma adjuvant and neo-adjuvant therapy.

Main Methods:

  • Utilized Serial Analysis of Gene Expression (SAGE) to detect ATM tags in melanoma.
  • Conducted functional studies targeting ATM via RNA interference and small-molecule inhibitors.
  • Exposed cells to ionizing radiation, alone or with a DNA-intercalating drug.

Main Results:

  • ATM is expressed at high levels in advanced-stage melanomas.
  • Targeting ATM did not induce apoptosis in melanoma cells following DNA-damaging treatments.
  • ATM does not appear to be the primary DNA damage sensor in advanced melanoma.

Conclusions:

  • Contrary to findings in other cancers, ATM is not pivotal in advanced melanoma's DNA damage response.
  • Genes other than ATM likely regulate DNA double-strand break repair in melanoma.
  • ATM's role in melanoma treatment warrants further investigation, as it may not be the key regulator of DNA repair.

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