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Taxol bristle ball: a wrench in the works for cancer
Date:9/12/2007

HOUSTON, Sept. 12, 2007 Rice University chemists have discovered a way to load dozens of molecules of the anti-cancer drug paclitaxel onto tiny gold spheres. The result is a tiny ball, many times smaller than a living cell that literally bristles with the drug.

Paclitaxel, which is sold under the brand name Taxol, prevents cancer cells from dividing by jamming their inner works.

"Paclitaxel is one of the most effective anti-cancer drugs, and many researchers are exploring how to deliver much more of the drug directly to cancer cells," said lead researcher Eugene Zubarev, the Norman Hackerman-Welch Young Investigator and assistant professor of chemistry at Rice. "We looked for an approach that would clear the major hurdles people have encountered -- solubility, drug efficacy, bioavailability and uniform dispersion -- and our initial results look very promising."

The research is available online and will appear in the Sept. 19 issue of the Journal of the American Chemical Society (J. Am. Chem. Soc. 2007, vol. 129, pgs.11653-11661).

First isolated from the bark of the yew tree in 1967, paclitaxel is one of the most widely prescribed chemotherapy drugs in use today. The drug is used to treat breast, ovarian and other cancers.

Paclitaxel works by attaching itself to structural supports called microtubules, which form the framework inside living cells. In order to divide, cells must break down their internal framework, and paclitaxel stops this process by locking the support into place.

Since cancer cells divide more rapidly than healthy cells, paclitaxel is very effective at slowing the growth of tumors in some patients. However, one problem with using paclitaxel as a general inhibitor of cell division is that it works on all cells, including healthy cells that tend to divide rapidly. This is why patients undergoing chemotherapy sometimes suffer side effects like hair loss and suppressed immune function.


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Contact: Jade Boyd
jadeboyd@rice.edu
713-348-6778
Rice University
Source:Eurekalert

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