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New mechanism of action for PARP inhibitors discovered
Date:11/9/2012

"Critical to this study, is the demonstration that PARP inhibitors are not equivalent with respect to their potency to trap PARP proteins," said Pommier. "Our findings indicate that PARP inhibitors should be categorized according to their potency to trap PARP, in addition to their ability to inhibit DNA repair. This is important because it might explain differences in the results of clinical trials using distinct PARP inhibitors."

In further experiments, the researchers identified several genetic mutations in post-replication repair and Fanconi anemia pathways that, like BRCA1 and BRCA2 mutations, sensitized cultured cells to the toxic effects of trapped PARP protein-DNA complexes.

"These data suggest that patients with cancers deficient in these PARP inhibitor-sensitizing genes might benefit from treatment with PARP inhibitors," said Pommier. "It is clear, however, that this hypothesis will require rigorous testing before being broadly translated to the clinic."


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Contact: Jeremy Moore
Jeremy.Moore@aacr.org
215-446-7109
American Association for Cancer Research
Source:Eurekalert

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