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New synthetic molecules trigger immune response to HIV and prostate cancer
Date:11/5/2009

New Haven, Conn.Researchers at Yale University have developed synthetic molecules capable of enhancing the body's immune response to HIV and HIV-infected cells, as well as to prostate cancer cells. Their findings, published online in the Journal of the American Chemical Society, could lead to novel therapeutic approaches for these diseases.

The molecules called "antibody-recruiting molecule targeting HIV" (ARM-H) and "antibody-recruiting molecule targeting prostate cancer" (ARM-P) work by binding simultaneously to an antibody already present in the bloodstream and to proteins on HIV, HIV-infected cells and cancer cells. By coating these pathogens in antibodies, the molecules flag them as a threat and trigger the body's own immune response. In the case of ARM-H, by binding to proteins on the outside of the virus, they also prevent healthy human cells from being infected.

"Instead of trying to kill the pathogens directly, these molecules manipulate our immune system to do something it wouldn't ordinarily do," said David Spiegel, M.D., assistant professor of chemistry and the corresponding author of both papers.

Because both HIV and cancer have methods for evading the body's immune system, treatments and vaccinations for the two diseases have proven difficult. Current treatment options for HIV and prostate cancer including antiviral drugs, radiation and chemotherapy involve severe side effects and are often ineffective against advanced cases. While there are some antibody drugs available, they are difficult to produce in large quantities and are costly. They also must be injected and are accompanied by severe side effects of their own.

By contrast, the ARM-H and ARM-P molecules, which the team has begun testing in mice, are structurally simple, inexpensive to produce, and could in theory be taken in pill form, Spiegel said. And because they are unlikely to target essential biological processes in the body, the sid
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Contact: Suzanne Taylor Muzzin
suzanne.taylormuzzin@gmail.com
203-432-8555
Yale University
Source:Eurekalert

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