Abstract
Purpose
Werner’s syndrome (WS) is a recessive disorder of premature onset of processes associated with aging. Defective DNA repair has been reported after exposure of cells isolated from WS patients to DNA-damaging agents. The germline 4330T>C (Cys1367Arg) variant in the WS gene (WRN) has been associated with protection from age-related diseases, suggesting it has a functional role. We studied whether the 4330T>C variant confers altered drug sensitivity in vitro.
Methods
4330T>C was genotyped in 372 human lymphoblastoid cell lines (LCLs) from unrelated healthy Caucasian individuals using a TaqMan-based method. The study was powered to detect the effect of the 4330T>C genotypes after exposure to camptothecin (based upon preliminary data). The effect of the 4330T>C variant on the cytotoxicity of etoposide, carboplatin, cisplatin and daunorubicin was also tested. WRN expression in 57 LCLs was measured by microarray.
Results
No significant difference between the IC50 of the cells was observed among genotypes (P = 0.46) after exposure to camptothecin. No association was also observed for etoposide, carboplatin, cisplatin, and daunorubicin (ANOVA, P > 0.05). WRN expression also did not vary across genotypes (ANOVA, P = 0.37).
Conclusion
These results suggest that this nonsynonymous variant has relatively normal function at the cellular level.
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Abbreviations
- WS:
-
Werner’s syndrome
- WRN:
-
Werner’s syndrome gene
- LCLs:
-
Lymphoblastoid cell lines
- 4NQO:
-
4-Nitro-quinoline-1-oxide
- SNPs:
-
Single nucleotide polymorphisms
- EBV:
-
Epstein–Barr virus
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Acknowledgments
This work was supported by the Pharmacogenetics of Anticancer Agents Research (PAAR) Group (http://pharmacogenetics.org) (NIH/NIGMS grant U01GM61393). Data has been deposited into PharmGKB (supported by NIH/NIGMS U01GM61374, hhtp://pharmgkb.org/) under submission numbers PS207132, PS207134, PS206923, PS206922, PS206925 and PS207015 for WRN genotype and sensitivity to camptothecin, cisplatin, etoposide, daunorubicin and carboplatin, respectively. The authors wish to thank the PAAR Lymphoblastoid Cell Core at the University of Chicago (directed at the time of this study by Dr. Amittha Wickrema) for maintaining the lymphoblastoid cell lines used in this study.
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Innocenti, F., Mirkov, S., Nagasubramanian, R. et al. The Werner’s syndrome 4330T>C (Cys1367Arg) gene variant does not affect the in vitro cytotoxicity of topoisomerase inhibitors and platinum compounds. Cancer Chemother Pharmacol 63, 881–887 (2009). https://doi.org/10.1007/s00280-008-0793-8
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DOI: https://doi.org/10.1007/s00280-008-0793-8