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New Insights Into Vaccination For HIV

Date:
January 31, 2008
Source:
Public Library of Science
Summary:
Scientists have developed new tools and paradigms to understand immune evasion from HIV. They show that both prior vaccination and timing influence the rates of immune escape, providing further insight into the effectiveness of T cell immunity to HIV.

A group of Australian researchers at the Universities of Melbourne and New South Wales have developed new tools and paradigms to understand immune evasion from HIV. The study shows that both prior vaccination and timing influence the rates of immune escape, providing further insight into the effectiveness of T cell immunity to HIV.

An HIV vaccine is urgently needed. A major hurdle is the rapid evolution of HIV and its ability to mutate to escape effective immunity. Low levels of mutant virus cannot be detected with standard techniques, making it difficult to study the evolution of mutant viruses.

The group, led by PhD student Liyen Loh and Dr. Stephen Kent, developed highly sensitive assays to track mutant viruses. They show that vaccination of macaques against SIV (a simian AIDS virus) results in the rapid selection of mutant viruses. In contrast, escape mutants evolve much more slowly when they appear later during infection.

Mutant viruses, however, result in some "fitness" cost and they revert back when transmitted to a new host. Reversion of mutant viruses also follows the same principles -- rapid during acute infection and slower during chronic infection. These insights suggest new ways to improve HIV vaccines.

Journal citation: Loh L, Petravic J, Batten CJ, Davenport MP, Kent SJ (2008) Vaccination and timing influence SIV immune escape viral dynamics in vivo. PLoS Pathog 4(1): e12. doi:10.1371/journal.ppat.0040012http://pathogens.plosjournals.org/perlserv/?request=get-document&doi=10.1371/journal.ppat.0040012


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The above story is based on materials provided by Public Library of Science. Note: Materials may be edited for content and length.


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Public Library of Science. "New Insights Into Vaccination For HIV." ScienceDaily. ScienceDaily, 31 January 2008. <www.sciencedaily.com/releases/2008/01/080124233642.htm>.
Public Library of Science. (2008, January 31). New Insights Into Vaccination For HIV. ScienceDaily. Retrieved September 21, 2014 from www.sciencedaily.com/releases/2008/01/080124233642.htm
Public Library of Science. "New Insights Into Vaccination For HIV." ScienceDaily. www.sciencedaily.com/releases/2008/01/080124233642.htm (accessed September 21, 2014).

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