Vaccine-delivered HIV envelope inhibits CD4(+) T-cell activation, a mechanism for poor HIV vaccine responses.

Abstract:

:The human immunodeficiency virus (HIV) causes impairment of the immune system in part by targeting CD4(+) T cells for infection and dysfunction. HIV envelope (Env) present on free virions and infected cells causes dysfunction of uninfected bystander CD4(+) T cells via interaction with both CD4 and coreceptors. Env is commonly used as part of a cocktail of HIV antigens in current vaccines. In DNA and viral vector vaccine approaches, antigen-presenting cells (APCs) and non-APCs in the vicinity of the vaccine delivery site and draining lymph node express vaccine-derived antigens. The studies here demonstrate that cell-surface expression of Env on APCs and non-APCs as part of the vaccine action causes an inhibition of antigen-induced CD4(+) T-cell activation and proliferation mediated by CD4 binding and suggests a potential mechanism for reduced activity of Env-containing HIV vaccines. Similar studies using a functional Env lacking CD4 binding circumvented suppression, suggesting an alternative and potentially superior approach to HIV vaccine design.

journal_name

Blood

journal_title

Blood

authors

Fernando K,Hu H,Ni H,Hoxie JA,Weissman D

doi

10.1182/blood-2006-08-038661

subject

Has Abstract

pub_date

2007-03-15 00:00:00

pages

2538-44

issue

6

eissn

0006-4971

issn

1528-0020

pii

blood-2006-08-038661

journal_volume

109

pub_type

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