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Tenofovir gel provides high level of protection against HIV in rectal tissue
Date:2/28/2011

mitted infections. The majority of microbicide research thus far has focused on products to prevent HIV during vaginal sex. Yet, the risk of becoming infected with HIV from unprotected anal sex may be at least 20 times greater than unprotected vaginal sex, in part because the rectal lining is only one-cell thick compared to the vagina's multiple layers, making it easier for the virus to reach cells to infect.

The study, known as RMP-02/MTN-006, is the first clinical trial of tenofovir gel for rectal use. Last year, tenofovir gel was shown in a trial called CAPRISA 004 to reduce the risk of HIV infection in women who used it before and after vaginal sex.

Conducted at UCLA and the University of Pittsburgh, RMP-02/MTN-006 tested two products tenofovir gel and oral tenofovir in 18 sexually abstinent, HIV-negative men and women. Oral tenofovir, an antiretroviral (ARV) tablet commonly used to treat people with HIV in combination with other ARVs, is being explored as a means to prevent infection in people who are HIV-negative through an approach called pre-exposure prophylaxis, or PrEP.

The trial directly compared the anti-HIV activity of a single dose of oral tenofovir to a single dose of rectally-applied tenofovir gel. This was followed by six days of at-home dosing of tenofovir gel or a placebo gel, with the last and seventh dose given in the clinic. A novel approach was used to determine whether any actual protection was provided by the drug given in the different regimens single oral, single gel and seven-day gel (or placebo) in which small biopsies were taken from the rectal lining of the participants using a standard clinical procedure called sigmoidoscopy. The tissue samples were then sent directly to the laboratory where they were exposed to HIV to determine how well study products protected the tissue from infection.

The researchers found that HIV was significantly inhibited in tissue samples from participants who used t
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Contact: Clare Collins
collcx@upmc.edu
412-770-8643
Microbicide Trials Network
Source:Eurekalert

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