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CD8+ T lymphocyte responses target functionally important regions of Protease and Integrase in HIV-1 infected subjects

BACKGROUND: CD8+ T cell responses are known to be important to the control of HIV-1 infection. While responses to reverse transcriptase and most structural and accessory proteins have been extensively studied, CD8 T cell responses specifically directed to the HIV-1 enzymes Protease and Integrase hav...

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Autores principales: Rodriguez, William R, Addo, Marylyn M, Rathod, Almas, Fitzpatrick, Cecily A, Yu, Xu G, Perkins, Beth, Rosenberg, Eric S, Altfeld, Marcus, Walker, Bruce D
Formato: Texto
Lenguaje:English
Publicado: BioMed Central 2004
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC441415/
https://www.ncbi.nlm.nih.gov/pubmed/15154967
http://dx.doi.org/10.1186/1479-5876-2-15
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author Rodriguez, William R
Addo, Marylyn M
Rathod, Almas
Fitzpatrick, Cecily A
Yu, Xu G
Perkins, Beth
Rosenberg, Eric S
Altfeld, Marcus
Walker, Bruce D
author_facet Rodriguez, William R
Addo, Marylyn M
Rathod, Almas
Fitzpatrick, Cecily A
Yu, Xu G
Perkins, Beth
Rosenberg, Eric S
Altfeld, Marcus
Walker, Bruce D
author_sort Rodriguez, William R
collection PubMed
description BACKGROUND: CD8+ T cell responses are known to be important to the control of HIV-1 infection. While responses to reverse transcriptase and most structural and accessory proteins have been extensively studied, CD8 T cell responses specifically directed to the HIV-1 enzymes Protease and Integrase have not been well characterized, and few epitopes have been described in detail. METHODS: We assessed comprehensively the CD8 T cell responses to synthetic peptides spanning Protease and Integrase in 56 HIV-1 infected subjects with acute, chronic, or controlled infection using IFN-γ-Elispot assays and intracellular cytokine staining. Fine-characterization of novel CTL epitopes was performed on peptide-specific CTL lines in Elispot and (51)Chromium-release assays. RESULTS: Thirteen (23%) and 38 (68%) of the 56 subjects had detectable responses to Protease and Integrase, respectively, and together these targeted most regions within both proteins. Sequence variability analysis confirmed that responses cluster largely around conserved regions of Integrase, but responses against a large, highly conserved region of the N-terminal DNA-binding domain of Integrase were not readily detected. CD8 T cell responses targeted regions of Protease that contain known Protease inhibitor mutation residues, but strong Protease-specific CD8 T cell responses were rare. Fine-mapping of targeted epitopes allowed the identification of three novel, HLA class I-restricted, frequently-targeted optimal epitopes. There were no significant correlations between CD8 T cell responses to Protease and Integrase and clinical disease category in the study subjects, nor was there a correlation with viral load. CONCLUSIONS: These findings confirm that CD8 T cell responses directed against HIV-1 include potentially important functional regions of Protease and Integrase, and that pharmacologic targeting of these enzymes will place them under both drug and immune selection pressure.
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spelling pubmed-4414152004-07-02 CD8+ T lymphocyte responses target functionally important regions of Protease and Integrase in HIV-1 infected subjects Rodriguez, William R Addo, Marylyn M Rathod, Almas Fitzpatrick, Cecily A Yu, Xu G Perkins, Beth Rosenberg, Eric S Altfeld, Marcus Walker, Bruce D J Transl Med Research BACKGROUND: CD8+ T cell responses are known to be important to the control of HIV-1 infection. While responses to reverse transcriptase and most structural and accessory proteins have been extensively studied, CD8 T cell responses specifically directed to the HIV-1 enzymes Protease and Integrase have not been well characterized, and few epitopes have been described in detail. METHODS: We assessed comprehensively the CD8 T cell responses to synthetic peptides spanning Protease and Integrase in 56 HIV-1 infected subjects with acute, chronic, or controlled infection using IFN-γ-Elispot assays and intracellular cytokine staining. Fine-characterization of novel CTL epitopes was performed on peptide-specific CTL lines in Elispot and (51)Chromium-release assays. RESULTS: Thirteen (23%) and 38 (68%) of the 56 subjects had detectable responses to Protease and Integrase, respectively, and together these targeted most regions within both proteins. Sequence variability analysis confirmed that responses cluster largely around conserved regions of Integrase, but responses against a large, highly conserved region of the N-terminal DNA-binding domain of Integrase were not readily detected. CD8 T cell responses targeted regions of Protease that contain known Protease inhibitor mutation residues, but strong Protease-specific CD8 T cell responses were rare. Fine-mapping of targeted epitopes allowed the identification of three novel, HLA class I-restricted, frequently-targeted optimal epitopes. There were no significant correlations between CD8 T cell responses to Protease and Integrase and clinical disease category in the study subjects, nor was there a correlation with viral load. CONCLUSIONS: These findings confirm that CD8 T cell responses directed against HIV-1 include potentially important functional regions of Protease and Integrase, and that pharmacologic targeting of these enzymes will place them under both drug and immune selection pressure. BioMed Central 2004-05-21 /pmc/articles/PMC441415/ /pubmed/15154967 http://dx.doi.org/10.1186/1479-5876-2-15 Text en Copyright © 2004 Rodriguez et al; licensee BioMed Central Ltd. This is an Open Access article: verbatim copying and redistribution of this article are permitted in all media for any purpose, provided this notice is preserved along with the article's original URL.
spellingShingle Research
Rodriguez, William R
Addo, Marylyn M
Rathod, Almas
Fitzpatrick, Cecily A
Yu, Xu G
Perkins, Beth
Rosenberg, Eric S
Altfeld, Marcus
Walker, Bruce D
CD8+ T lymphocyte responses target functionally important regions of Protease and Integrase in HIV-1 infected subjects
title CD8+ T lymphocyte responses target functionally important regions of Protease and Integrase in HIV-1 infected subjects
title_full CD8+ T lymphocyte responses target functionally important regions of Protease and Integrase in HIV-1 infected subjects
title_fullStr CD8+ T lymphocyte responses target functionally important regions of Protease and Integrase in HIV-1 infected subjects
title_full_unstemmed CD8+ T lymphocyte responses target functionally important regions of Protease and Integrase in HIV-1 infected subjects
title_short CD8+ T lymphocyte responses target functionally important regions of Protease and Integrase in HIV-1 infected subjects
title_sort cd8+ t lymphocyte responses target functionally important regions of protease and integrase in hiv-1 infected subjects
topic Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC441415/
https://www.ncbi.nlm.nih.gov/pubmed/15154967
http://dx.doi.org/10.1186/1479-5876-2-15
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