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HIV Domains Take On New Functions In Mediating Immunity

Date:
July 9, 2005
Source:
Journal of Clinical Investigation
Summary:
HIV evades the host immune system to cause infection. In a JCI study researchers examine the fusion peptide (FP) of HIV and show it plays two roles in HIV infection -- it mediates fusion of the virus with the cell membrane, while also downregulating the T cell responses that normally block infection. The authors show that FP ameliorates the autoimmune disease adjuvant arthritis in rats. This study shows that FP, independent of HIV, may provide a novel way to decrease undesirable immune responses.

HIV is able to evade the host immune system to cause infection. In particular, HIV downregulates CD4+ immune T cell function, which might aid infection, but the mechanisms underlying this phenomenon are unknown. In a study appearing online on July 7 in advance of print publication of the August 1 issue of the Journal of Clinical Investigation, Yechiel Shai and colleagues from the Weizmann Institute examine the fusion peptide (FP) of HIV.

The researchers show that the FP plays two roles in HIV infection – it works with other domains to mediate fusion of the virus with the cell membrane, while also downregulating the T cell responses that normally would block infection.

The authors show that the HIV FP can co-localize with CD4 and T cell receptor in T cells, and inhibits antigen-specific T cell proliferation. This data highlights a potential immunosuppressive activity specific to HIV infection.

The authors then extend their findings by exploiting the activity of FP and show that it ameliorates the autoimmune disease adjuvant arthritis in rats. This study not only adds to our understanding of the mechanisms of HIV pathogenesis, but it also shows that the FP molecule, independent of HIV, may provide a novel way to decrease undesirable immune responses.

###

Title: HIV-1 Fusion Peptide Targets the TCR and Inhibits Antigen-Specific T-Cell Activation


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The above story is based on materials provided by Journal of Clinical Investigation. Note: Materials may be edited for content and length.


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Journal of Clinical Investigation. "HIV Domains Take On New Functions In Mediating Immunity." ScienceDaily. ScienceDaily, 9 July 2005. <www.sciencedaily.com/releases/2005/07/050709002120.htm>.
Journal of Clinical Investigation. (2005, July 9). HIV Domains Take On New Functions In Mediating Immunity. ScienceDaily. Retrieved October 23, 2014 from www.sciencedaily.com/releases/2005/07/050709002120.htm
Journal of Clinical Investigation. "HIV Domains Take On New Functions In Mediating Immunity." ScienceDaily. www.sciencedaily.com/releases/2005/07/050709002120.htm (accessed October 23, 2014).

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