Initiation of Human Immunodeficiency Virus Type 1 (HIV-1) Transcription is Inhibited by Noncytolytic CD8+ Suppression
R Glenn Overman1, §, Anthony L Llorens3, §, Michael L Greenberg6, Mariano A Garcia-Blanco3, 4, Georgia D Tomaras*, 1, 2, 4
Article Information
Identifiers and Pagination:
Year: 2007Volume: 1
First Page: 1
Last Page: 7
Publisher Id: TOVJ-1-1
DOI: 10.2174/1874357900701010001
Article History:
Received Date: 18/6/2007Revision Received Date: 9/7/2007
Acceptance Date: 20/7/2007
Electronic publication date: 13/8/2007
Collection year: 2007
open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.5/), which permits unrestrictive use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
The replication of human immunodeficiency virus type 1 (HIV-1) can be inhibited by noncytolytic CD8+ T cell mediated suppression, an immune response that specifically targets HIV-1 gene expression. Clinical studies demonstrate that this immune response may play an important role in the host defense against HIV infection. In this study, we examined the distinct steps in viral gene expression for inhibition by noncytolytic CD8+ T cells. A primary HIV-1 infection system of CD4+ enriched peripheral blood mononuclear cells was utilized to examine the HIV-1 life cycle as a relevant ex vivo system. Established CD8+ T cell lines from two HIV+ long-term nonprogressors were used to examine differences at the level of transcriptional initiation and elongation of the HIV genome. This infection system coupled with the results from real-time measurement of newly transcribed RNA transcripts determined that there was a significant decrease (5-8 fold) in short intracellular viral RNA transcripts. These data strongly favor a role for the initiation of virus transcription in noncytolytic CD8+ T cell mediated suppression.
