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TREX1 acts in degrading damaged DNA from drug-treated tumor cells

Chuan-Jen Wang1, Wing Lam, Scott Bussom

  • 1Department of Pharmacology, Yale University School of Medicine, New Haven, CT 06520, USA.

DNA Repair
|July 21, 2009
PubMed

Insights

The DNA-degrading enzyme TREX1 (three prime repair exonuclease 1) is not involved in anticancer drug resistance. TREX1 functions in degrading DNA from dying cells, reducing overall cellular DNA content.

Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • The exonuclease TREX1 (three prime repair exonuclease 1) is implicated in DNA repair and drug resistance, but cellular evidence is lacking.
  • Recent studies suggest TREX1's involvement in autoimmune diseases.

Purpose of the Study:

  • To investigate the role of TREX1 expression and function in tumor cells treated with anticancer drugs.
  • To determine if TREX1 influences cellular sensitivity to DNA-damaging agents.

Main Methods:

  • Studied TREX1 expression and localization in various tumor cell types.
  • Treated cells with camptothecin and other DNA-damaging agents.
  • Utilized a TREX1-inducible cell line and performed clonogenic assays.

Main Results:

  • TREX1 expression and localization were found to be cell-type dependent.
  • DNA-damaging agents induced TREX1 mRNA and protein in a dose- and time-dependent manner.
  • TREX1 induction did not alter cellular sensitivity to anticancer drugs, suggesting no role in DNA repair or drug resistance.

Conclusions:

  • TREX1 is not involved in anticancer drug sensitivity or DNA repair.
  • TREX1 acts as a key enzyme in degrading DNA from dying cells, reducing cellular DNA.
  • Ubiquitous TREX1 expression suggests a role in DNA degradation across all cell types during apoptosis before phagocytosis.

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