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Understanding Why Infection With HIV-2 Is Not As Bad As HIV-1

Date:
September 11, 2007
Source:
Journal of Clinical Investigation
Summary:
There are two distinct, but related, HIV viruses that humans can become infected with -- HIV-1 and HIV-2. Individuals infected with HIV-2 progress to AIDS at a dramatically reduced rate compared with individuals infected with HIV-1; in fact, most individuals infected with HIV-2 die of unrelated causes. It is hoped that understanding why individuals infected with HIV-2 rarely progress to AIDS will help with the design of therapeutics and vaccine strategies for the treatment and prevention, respectively, of infection with HIV-1.
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There are two distinct, but related, HIV viruses that humans can become infected with -- HIV-1 and HIV-2. Individuals infected with HIV-2 progress to AIDS at a dramatically reduced rate compared with individuals infected with HIV-1; in fact, most individuals infected with HIV-2 die of unrelated causes.

It is hoped that understanding why individuals infected with HIV-2 rarely progress to AIDS will help with the design of therapeutics and vaccine strategies for the treatment and prevention, respectively, of infection with HIV-1.

A new study by Aleksandra Leligdowicz and colleagues at the Weatherall Institute of Molecular Medicine, Oxford, demonstrates that individuals infected with HIV-2 mount a strong immune response to a specific region of the viral protein Gag.

The robustness of this response was inversely correlated with the amount of virus detected in the individual. In turn, individuals with high levels of detectable virus had fewer CD4+ T cells, indicating that they were progressing towards AIDS. The authors therefore suggest that T cell responses to Gag are important in determining the better outcome of infection with HIV-2 than infection with HIV-1.

Article:  Robust Gag-specific T cell responses characterize viremia control in HIV-2 infection, Journal of Clinical Investigation


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The above post is reprinted from materials provided by Journal of Clinical Investigation. Note: Materials may be edited for content and length.


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Journal of Clinical Investigation. "Understanding Why Infection With HIV-2 Is Not As Bad As HIV-1." ScienceDaily. ScienceDaily, 11 September 2007. <www.sciencedaily.com/releases/2007/09/070907105907.htm>.
Journal of Clinical Investigation. (2007, September 11). Understanding Why Infection With HIV-2 Is Not As Bad As HIV-1. ScienceDaily. Retrieved July 5, 2015 from www.sciencedaily.com/releases/2007/09/070907105907.htm
Journal of Clinical Investigation. "Understanding Why Infection With HIV-2 Is Not As Bad As HIV-1." ScienceDaily. www.sciencedaily.com/releases/2007/09/070907105907.htm (accessed July 5, 2015).

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