AIDS Vaccine: What Promise Do HIV Antibodies Hold?
by ilene - July 11th, 2010 12:58 pm
AIDS Vaccine: What Promise Do HIV Antibodies Hold?
By Alice Park, courtesy of TIME
An electron micrograph scan of HIV-1 budding from a cultured lymphocyte.
In the continuing search for the Achilles heel of HIV, researchers may finally be enjoying some success.
This week, government researchers at the Vaccine Research Center of the National Institute of Allergy and Infectious Diseases (NIAID) reported the discovery of two naturally occurring antibodies that may block HIV. Describing their work in two separate papers in the journal Science, AIDS experts said that in lab experiments, the antibodies had successfully prevented more than 90% of circulating HIV strains from infecting human cells.
This is not the first discovery of so-called broadly neutralizing antibodies. Last September, scientists at Scripps Research Institute and the International AIDS Vaccine Initiative (IAVI) identified two other antibodies that prevent against infection from 80% of existing HIV strains — the most potent known antibodies at the time. The findings were also published inScience.
The two sets of antibodies target different regions of the virus-cell interface — together they could help scientists develop a formidable vaccine against AIDS, says Dr. Anthony Fauci, director of NIAID. "The strategy is going to be to put the best antibodies together, and you are going to have a whopper against HIV," he says.
Antibodies are the first-line soldiers of the immune system. Produced by specialized cells in the body that recognize incoming viruses and bacteria, antibodies act as molecular barricades, latching onto and blocking pathogens from infecting healthy cells. This antibody response is the core of all vaccine-based disease prevention.
But HIV is notoriously changeable. The virus continuously alters the makeup of the proteins on its surface, eluding attack from antibodies created by the immune system and from the relatively weak vaccines that have been developed against the virus so far.
The two new antibodies described in…
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Philip R. Davis is a founder Phil's Stock World, a stock and options trading site that teaches the art of options trading to newcomers and devises advanced strategies for expert traders...
Ilene is editor and affiliate program
coordinator for PSW.