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Einstein to develop anti-HIV drug delivery system
Date:10/2/2009

October 2, 2009 (BRONX, NY) The National Institutes of Health has awarded Albert Einstein College of Medicine of Yeshiva University a four-year, $7.2 million grant to develop a microbicide-releasing vaginal ring to prevent HIV transmission.

"While condoms are excellent at preventing the transmission of HIV, it's often difficult for women to negotiate their use," says principal investigator Betsy C. Herold, M.D., professor of pediatrics, of microbiology & immunology, and of obstetrics & gynecology and women's health at Einstein. "It's imperative that women have alternative strategies available to protect their own health. Our belief is that an intravaginal ring that delivers a combination of drugs is the best strategy."

Vaginal rings are soft, plastic, doughnut-shaped devices designed to provide controlled release of drugs to the vagina over extended periods. At present, there are several models available for delivering contraceptives, but none for microbicides.

Dr. Herold and her colleagues will evaluate several anti-HIV microbicides, ultimately aiming for a two-drug combination. "Over the last decade, we've learned that when you expose HIV to a single drug, you make it easier to select for resistance," she says. "So, we are trying to target HIV infection at two different steps very early in its life cycle, which should prevent the establishment of any infection."

One of the drugs to be evaluated is tenofovir, which blocks reverse transcriptase, an enzyme crucial to HIV reproduction. Tenofovir is used currently as an oral systemic therapy against HIV, but it has also shown promise as a topical microbicide. The team will also test the efficacy of two so-called fusion inhibitors, including maraviroc and PIE12-trimer, which block the virus from entering target immune cells by different mechanisms.

The team will pay particular attention to choosing microbicides that preserve natural vaginal defenses against HIV.
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Contact: Deirdre Branley
sciencenews@einstein.yu.edu
718-430-3101
Albert Einstein College of Medicine
Source:Eurekalert  

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