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Smaller sibling protein calls the shots in cell division
Date:1/3/2012

AUGUSTA, Ga. Scientists have found at least one instance when the smaller sibling gets to call the shots and cancer patients may one day benefit.

The protein Chk1 has long been known to be a checkpoint in cell development: it keeps normal cells and damaged cells from dividing until their DNA has been fully replicated or repaired. Now scientists at Georgia Health Sciences University and the California Institute of Technology have discovered a shorter form they've dubbed Chk1-S ("S" stands for short) that essentially neutralizes its longer sibling so cell division can proceed.

That shorter form is in higher levels in cancer cells as well as fetal tissue, both of which require accelerated cell division. But the scientists also have shown that very high levels of Chk1-S actually reduce tumor growth and prompt premature cell division and death in other cells.

"Chk1 is needed for division of all cells, even cancer cells, so if you inhibit it completely by over-expressing Chk1-S, those cells also will not grow," said Dr. Navjotsingh Pabla, a postdoctoral fellow at Caltech. Chk1-S expression is nearly zero in normal, non-dividing cells.

These findings, published in Proceedings of the National Academy of Sciences, point toward the short form's potential to help diagnose and/or treat cancer, they said. Chk1 inhibitors, which promote abnormal cell division and likely cell death to occur before DNA replication/repair is complete, already are being tested on patients.

"Chk1-S is only expressed at a time when DNA is replicated or repaired so it binds to its sibling protein, Chk1, antagonizing it so now the cell can divide," said Dr. Zheng Dong, cell biologist at GHSU and the Charlie Norwood Veterans Affairs Medical Center in Augusta. "The question that has been hanging on for many years is: How is Chk1 regulated?"

They found that significantly increasing levels of Chk1-S induces cell division regardless of whether DNA replication or repair is co
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Contact: Toni Baker
tbaker@georgiahealth.edu
706-721-4421
Georgia Health Sciences University
Source:Eurekalert  

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