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Immunodetection of DNA repair endonuclease ERCC1-XPF in human tissue

Nikhil R Bhagwat1, Vera Y Roginskaya, Marie B Acquafondata

  • 1Department of Human Genetics, University of Pittsburgh School of Public Health, PA, USA.

Cancer Research
|September 3, 2009
PubMed

Insights

Accurate measurement of ERCC1-XPF protein is crucial for predicting chemotherapy response. This study validates antibodies for detecting ERCC1-XPF, finding many commonly used ones are unsuitable for tissue analysis.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Biochemistry

Background:

  • Chemotherapy resistance and side effects necessitate predictive biomarkers.
  • ERCC1-XPF nuclease is vital for DNA repair pathways targeted by cisplatin-based chemotherapy.
  • Accurate ERCC1-XPF expression measurement in tumors is critical for personalized cancer treatment.

Purpose of the Study:

  • To rigorously evaluate the specificity of various antibodies against human ERCC1 or XPF.
  • To identify reliable antibodies for detecting ERCC1-XPF protein in different biological samples and applications.
  • To assess the suitability of antibodies for detecting ERCC1-XPF in fixed specimens for clinical relevance.

Main Methods:

  • Tested a panel of antibodies against ERCC1-XPF using ERCC1-XPF-deficient cells as a negative control.
  • Evaluated antibody specificity across multiple applications: immunoblotting, immunoprecipitation, immunofluorescence, and immunohistochemistry.
  • Assessed antibody performance in detecting ERCC1-XPF colocalization with UV-induced DNA damage in fixed cells.

Main Results:

  • Several antibodies demonstrated suitability for ERCC1-XPF immunodetection in specific applications.
  • The widely used 8F1 antibody was found unsuitable for immunodetection in tissue samples.
  • Validated antibodies revealed significant variations in ERCC1-XPF protein levels across different cell types and samples.

Conclusions:

  • Only a subset of commercially available antibodies are appropriate for reliable ERCC1-XPF detection in fixed specimens.
  • Validated antibodies are essential for accurate assessment of ERCC1-XPF expression as a predictive biomarker.
  • This study provides critical guidance for selecting appropriate antibodies for ERCC1-XPF research and clinical applications.

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