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Cause and potential treatment found for cancer drug's kidney toxicity
Date:6/2/2011

AUGUSTA, Ga. Scientists may have a way to make the powerful cancer drug cisplatin less toxic to the kidneys and more effective against some cancers.

The chemotherapeutic agent used in combination with other drugs for a variety of cancers, results in kidney damage or failure in about 30 percent of users, although the mechanism has been unclear. The most physicians can do today to protect the kidneys is advise patients to drink more water.

The relatively simple, highly reactive compound tends to accumulate in the kidneys, said Dr. Navjotsingh Pabla, postdoctoral fellow at Georgia Health Sciences University and first author on the study in The Journal of Clinical Investigation. "The kidneys can take it up, but they have trouble removing it, so it just accumulates," he said.

The kidneys' endless workload of filtering some substances while resorbing others leaves them vulnerable to injury, one of the reasons the kidneys are the first organ to shut down when a patient is critically ill, said Dr. Zheng Dong, GHSU cell biologist, Career Research Scientist at the Charlie Norwood Veterans Affairs Medical Center in Augusta and the study's senior author. "Any stress to the cell can injure it," Dong said.

The scientists have shown in mice with tumors as well as human cancer cells in culture that cisplatin highly activates protein kinase C delta; protein kinases regulate other proteins by adding phosphates to them that can change their function. They've further shown that protein kinase C delta is a key mediator of cell death in kidneys and important to cancer cell survival.

The dichotomy appears useful because they've also shown that a drug, already in clinical trials for its potential in protecting brain cells following stroke, blocks the kidney destruction. In fact, protein kinase inhibitors in mice with tumors, enhanced breast and ovarian cancer treatment.

"Normal cells may not depend on this protein for survival and growth so
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Contact: Toni Baker
tbaker@georgiahealth.edu
706-721-4421
Georgia Health Sciences University
Source:Eurekalert  

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