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First compound that specifically kills cancer stem cells found
Date:8/13/2009

The cancer stem cells that drive tumor growth and resist chemotherapies and radiation treatments that kill other cancer cells aren't invincible after all. Researchers reporting online on August 13th in the journal Cell, a Cell Press publication, have discovered the first compound that targets those cancer stem cells directly.

"It wasn't clear it would be possible to find compounds that selectively kill cancer stem cells," said Piyush Gupta of the Massachusetts Institute of Technology (MIT) and the Broad Institute. "We've shown it can be done."

The team including MIT's Robert Weinberg and the Broad Institute's Eric Lander developed a new high-throughput screening method that makes it possible for the first time to systematically look for agents that kill cancer stem cells. That ability had previously eluded researchers due to the rarity of those cells within tumor cell populations and their relative instability in laboratory culture.

In the new study, the researchers manipulated cultured breast cancer cells to greatly enrich for those with the stem-like properties, including increased resistance to standard cancer drugs. They then screened a library of 16,000 natural and commercial chemical compounds for their ability to kill those stem-like cells and not other cancer cells. That screen turned up 32 contenders.

The researchers narrowed that list down to a handful of chemicals that they could readily get in sufficient quantities for further testing on normal cancer stem cells. Of those, one called salinomycin was the clear winner.

Salinomycin reduced the proportion of breast cancer stem cells by more than 100-fold compared to a commonly used chemotherapeutic drug for breast cancer called paclitaxel (aka Taxol). Salinomycin-treated cells were less able than paclitaxel-treated ones to seed tumors when injected into mice, they report. Salinomycin treatment also slowed the growth of the animals' tumors.

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Contact: Cathleen Genova
cgenova@cell.com
617-397-2802
Cell Press
Source:Eurekalert

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