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Compounds could be new class of cancer drugs
Date:2/3/2009

A team of Vanderbilt University Medical Center investigators has developed a group of chemical compounds that could represent a new class of drugs for treating cancer.

The compounds are the first selective inhibitors of the protein phospholipase D (PLD), an enzyme that has been implicated in multiple human cancers including breast, renal, gastric and colorectal.

The new inhibitors, reported in the February issue of Nature Chemical Biology, block the invasive migration of breast cancer cells, supporting their further development as antimetastatic agents. They will also be useful tools for understanding the complex roles of PLD in cellular physiology, said H. Alex Brown, Ph.D., professor of Pharmacology and one of the team leaders.

"PLD is associated with many fundamental cellular processes like secretion, migration, growth and proliferation. But the absence of selective inhibitors has really interfered with the ability of biologists to study this important enzyme," Brown said.

There are two related "isoforms" of PLD: PLD1 and PLD2. Both PLD enzymes produce phosphatidic acid, a key lipid metabolic and signaling molecule. But whether the two PLDs have different roles is an open question, one that the new isoform-selective inhibitors can now be used to address.

Brown and colleagues had discovered that PLD was important to the invasive migration of breast cancer cells in culture using a genetic tool called small interfering RNA (siRNA).

"When we had evidence from siRNA and other methods that blocking PLD resulted in dramatic effects of blocking metastatic invasion of breast cancer cells, we were highly motivated to attempt to make isoform-selective inhibitors," Brown said.

Craig Lindsley, Ph.D., a medicinal chemist who joined the Vanderbilt faculty after five years at Merck Research Laboratories, and his group used a previously described PLD inhibitor as a starting point for a chemistry process called diversity-oriented synthesis.
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Contact: Leigh MacMillan
leigh.macmillan@vanderbilt.edu
615-322-4747
Vanderbilt University Medical Center
Source:Eurekalert

Page: 1 2

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