Poly(ADP-ribose) polymerase-1 polymorphisms, expression and activity in selected human tumour cell lines
1Northern Institute for Cancer Research, Newcastle University, Paul O'Gorman Building, Newcastle upon Tyne NE2 4HH, UK.
British Journal of Cancer
|July 2, 2009
Summary
Poly(ADP-ribose) polymerase-1 (PARP-1) activity varies widely in cancer cells, but this activity does not correlate with protein levels or common genetic variations. Further research is needed to understand PARP-1
Area of Science:
- Biochemistry
- Molecular Biology
- Cancer Research
Background:
- Poly(ADP-ribose) polymerase-1 (PARP-1) is a DNA-binding enzyme crucial for DNA repair.
- PARP-1 activity is often elevated in cancer, yet certain genetic variations (SNPs) linked to reduced activity may increase cancer predisposition.
- This study addresses the conflicting observations regarding PARP-1 activity and cancer risk.
Purpose of the Study:
- To investigate the relationship between PARP-1 polymorphisms, protein expression, and enzymatic activity in human cancer cell lines.
- To resolve discrepancies between elevated PARP-1 activity in cancer and the potential cancer-predisposing effects of specific PARP-1 SNPs.
Main Methods:
- Analysis of PARP-1 polymorphisms, protein expression, and enzymatic activity.
- Utilized a panel of 19 diverse human cancer cell lines (adult and pediatric, solid and hematological).
Main Results:
- Significant variation in PARP activity (CV=103%) and protein expression (CV=32%) was observed across the cell line panel.
- Cancer cell lines exhibited 45-fold higher mean PARP activity and 23-fold higher mean PARP-1 protein levels compared to normal human lymphocytes.
- No significant correlation was found between PARP activity and either PARP-1 protein levels or the T2444C and CA polymorphisms.
Conclusions:
- PARP-1 activity in cancer cells is highly variable and does not directly correlate with PARP-1 protein levels or common genetic polymorphisms.
- The functional impact of PARP-1 variations on enzyme activity in the context of cancer requires further investigation.
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