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J Virol. 2011 Dec;85(23):12102-13. doi: 10.1128/JVI.05607-11. Epub 2011 Aug 17.

Antigen-dependent and -independent mechanisms of T and B cell hyperactivation during chronic HIV-1 infection.

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  • 1Institute of Microbiology, ETH Zurich, Wolfgang-Pauli-Str. 10, HCI G401, 8093 Zurich, Switzerland.

Abstract

Continuous loss of CD4(+) T lymphocytes and systemic immune activation are hallmarks of untreated chronic HIV-1 infection. Chronic immune activation during HIV-1 infection is characterized by increased expression of activation markers on T cells, elevated levels of proinflammatory cytokines, and B cell hyperactivation together with hypergammaglobulinemia. Importantly, hyperactivation of T cells is one of the best predictive markers for progression toward AIDS, and it is closely linked to CD4(+) T cell depletion and sustained viral replication. Aberrant activation of T cells is observed mainly for memory CD4(+) and CD8(+) T cells and is documented, in addition to increased expression of surface activation markers, by increased cell cycling and apoptosis. Notably, the majority of these activated T cells are neither HIV specific nor HIV infected, and the antigen specificities of hyperactivated T cells are largely unknown, as are the exact mechanisms driving their activation. B cells are also severely affected by HIV-1 infection, which is manifested by major changes in B cell subpopulations, B cell hyperactivation, and hypergammaglobulinemia. Similar to those of T cells, the mechanisms underlying this aberrant B cell activation remain largely unknown. In this review, we summarized current knowledge about proposed antigen-dependent and -independent mechanisms leading to lymphocyte hyperactivation in the context of HIV-1 infection.

PMID:
21849433
PMCID:
PMC3209369
DOI:
10.1128/JVI.05607-11
[PubMed - indexed for MEDLINE]
Free PMC Article
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