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Researchers Develop Potent Cancer Killer From Vitamin E Derivative

Researchers have now developed a potent cancer killer based on the finding that alpha tocopheryl succinate or Vitamin E succinate// (derivative of Vitamin E) is capable of inducing death of cancer cells. Infamous for its anti-oxidant properties, many take the substance as a nutritional supplement.

The substance kills cancer cells by causing them to undergo a natural process known as programmed cell death, or apoptosis. Until now, no one knew how the agent caused this to happen.

These findings answer that question and also indicate that the molecule's antitumor activity is separate from its antioxidant effect.

The study, led by researchers with The Ohio State University Comprehensive Cancer Center – Arthur G. James Cancer Hospital and Richard J. Solove Research Institute (OSUCCC-James), is published in the April 28 issue of the Journal of Biological Chemistry.

‘Our findings could lead to a potent chemopreventive agent that has both strong anticancer and antioxidant properties,’ says principal investigator Ching-Shih Chen, professor of pharmacy and of internal medicine, and a researcher with the OSUCCC-James.

‘Such an agent might help reduce the risk of prostate, colon and other cancers.’

Chen and his collaborators found that vitamin E succinate works by blocking a protein called Bcl-xL. The protein, which is made by healthy cells, is often present at abnormally high levels in cancer cells and protects them from dying when they should.

Using computer modeling, the researchers found that the vitamin E derivative works because it lodges in a groove in the structure of the Bcl-xL protein, disabling it.

However, the vitamin E molecule has a long, coiled, protruding tail that keeps the molecule from fitting tightly, and more effectively, into the groove.

‘Once we identified how the agent and the protein interact, we asked how we could improve that interaction,’ Chen says.

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