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Peptide being tested to treat atherosclerosis inhibits ovarian cancer growth
Date:11/1/2010

d by Farias-Eisner, Reddy and their research teams.

They observed that one of the markers, apoA-I, was decreased in patients with early stage disease. They wondered why the protein was decreased and set out to uncover the answer. They speculated that the protein might be protective, and may be preventing disease progression.

The protein, apoA-I, is the major component of HDL, the good cholesterol, and plays an important role in reverse cholesterol transport by extracting cholesterol and lipids from cells and transferring it to the liver for extraction. The protein also has anti-inflammatory and antioxidant properties. Because lipid transport, inflammation and oxidative stress are associated with the development and progression of cancer, Farias-Eisner and Reddy hypothesized that the reduced levels of apoA-I in ovarian cancer patients may be causal in disease progression.

Mice that were engineered to have many copies of human apoA-I gene showed very little cancer development when induced with ovarian cancer, while the mice without the extra copies of apoA-I showed much more disease. The mice with extra copies of the apoA-I gene also lived 30 to 50 percent longer than those who didn't receive it.

Farias-Eisner and Reddy wanted to treat the mice that had more cancer with the protein apoA-I, but it was too large to conveniently administer, having 243 amino acids. The researchers then turned to apoA-I mimetic peptides - only 18 amino acids in length - that are being tested for cardiovascular diseases. That project had been ongoing for a number of years at UCLA, said Reddy, who is also a part of the cardiovascular research team led by Dr. Alan M. Fogelman, executive chair of the Department of Medicine.

"The smaller peptides mimic the larger apoA-I protein and provided us with agents we could give to the mouse to see if it was effective in fighting ovarian cancer," said Reddy. "One of the peptides was being tested as an exp
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Contact: Kim Irwin
kirwin@mednet.ucla.edu
310-206-2805
University of California - Los Angeles
Source:Eurekalert

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