PARP inhibitors can be novel treatment strategy for cisplatin-resistant cancer

Published on April 3, 2013 at 7:19 AM · No Comments

Poly (ADP-ribose) polymerase inhibitors may be a novel treatment strategy for patients with cancer that has become resistant to the commonly used chemotherapy drug cisplatin, according to data from a preclinical study published in Cancer Research, a journal of the American Association for Cancer Research.

"Cisplatin is one of the most widely used conventional, anticancer chemotherapy drugs," said Guido Kroemer, M.D., Ph.D., professor at University Paris Descartes in Paris, France. "Unfortunately, most patients respond only transiently to cisplatin therapy because their cancer cells develop ways to resist the effects of the drug."

Kroemer and colleagues set out to identify the biochemical changes that arise as cancer cells become resistant to cisplatin in the hope that the information could provide clues to potential new therapies. They focused their study on non-small cell lung cancer (NSCLC) cells because NSCLC is the leading cause of cancer-related morbidity and mortality worldwide and patients with NSCLC are frequently treated with cisplatin, according to Kroemer.

The researchers found that most NSCLC cell lines resistant to cisplatin had high levels of the protein poly (ADP-ribose) polymerase 1 (PARP1) and elevated amounts of poly (ADP-ribosyl) (PAR). In addition, they found that the PARP1 was hyperactivated. They observed similar results for cisplatin-resistant mesothelioma, ovarian cancer and cervical cancer cell lines.

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