Study in mice suggests hope for AIDS protection

As scientists struggle to find a vaccine to prevent infection with the AIDS virus, a study in mice suggests hope for a new approach — one that doctors now want to test in people.

The treated mice in the study appeared to have 100 percent protection against HIV. That doesn't mean the strategy will work in people. But several experts were impressed.

"This is a very important paper (about) a very creative idea," says the government's AIDS chief, Dr. Anthony Fauci. He didn't take part in the research.

The new study involved injecting mice with a protective gene, an idea that's been tested against HIV infection in animals for a decade.

In the nearly 30 years since HIV was identified, scientists haven't been able to find a vaccine that is broadly effective. One boost came in 2009, when a large study in Thailand showed that an experimental vaccine protected about a third of recipients against infection. That's not good enough for general use, but researchers are now trying to improve it.

The mouse work is reported by David Baltimore and colleagues at the California Institute of Technology.

Baltimore's team used a harmless virus to carry an antibody gene and injected it once into a leg muscle. The researchers found that the mice made high levels of the antibody for more than a year. The results suggest lifetime protection for a mouse, Baltimore said, although "we simply don't know what will happen in people."

If all goes well, a preliminary experiment to test the safety of the approach might begin in about a year, he said. Baltimore said his group is also planning human experiments that he hopes will start in the next couple years.

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