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J Acquir Immune Defic Syndr. 2012 Sep 1;61(1):9-18. doi: 10.1097/QAI.0b013e31825c1217.

Single-cell level response of HIV-specific and cytomegalovirus-specific CD4 T cells correlate with viral control in chronic HIV-1 subtype A infection.

Author information

  • 1U.S. Military HIV Research Program, 503 Robert Grant Avenue, Silver Spring, MD 20910, USA. meller@hivresearch.org

Abstract

BACKGROUND AND OBJECTIVE:

HIV-1 subtype A is the second most prevalent subtype globally and is associated with reduced viral load, higher CD4 absolute counts, and slower disease progression. To study the possible role of T cells associated with better outcome, we examined CD4 and CD8 T-cell responses against HIV-1 and cytomegalovirus (CMV) in Ugandans infected with subtype A HIV-1.

METHODS:

T-cell responses were investigated using flow cytometry and novel subtype A variant inclusive peptide (VIP) sets designed for this evaluation. CD4 T-cell responses focused primarily on Gag, whereas CD8 T-cell responses were broadly directed against Gag, gp41, and Nef VIP sets. CD4 T cells primarily responded with interferon (IFN)-γ, whereas CD8 cells were more diverse with degranulation (CD107a), IFN-γ, and macrophage inflammatory protein (MIP)-1β production.

RESULTS:

No relationship was observed between CD8 T-cell responses and the HIV-1 load. Similarly, the frequency of CD4 T cells responding to these antigens did not associate with viral control. However, in CD4 T cells responding against Gag or CMV, the IFN-γ intensity, indicative of the production at the single-cell level, was inversely proportional to viral load. No significant relationship was found between T-cell effector/memory phenotype and viral control.

CONCLUSIONS:

The per cell production of IFN-γ in CD4 T cells responding to HIV-1 or CMV correlated with viral control in chronic HIV-1 subtype A infection. These data suggest that quantitative aspects at the single-cell level may be more important than the frequency of antigen-specific CD4 T cells in HIV-1 subtype A infection control.

PMID:
22580564
[PubMed - indexed for MEDLINE]
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