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
Bloodjournal_title
Bloodauthors
Fernando K,Hu H,Ni H,Hoxie JA,Weissman Ddoi
10.1182/blood-2006-08-038661subject
Has Abstractpub_date
2007-03-15 00:00:00pages
2538-44issue
6eissn
0006-4971issn
1528-0020pii
blood-2006-08-038661journal_volume
109pub_type
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