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Cross-reactive microbial peptides can modulate HIV-specific CD8+ T cell responses.

Cross-reactive microbial peptides can modulate HIV-specific CD8+ T cell responses.
Author Information (click to view)

Pohlmeyer CW, Laskey SB, Beck SE, Xu DC, Capoferri AA, Garliss CC, May ME, Livingston A, Lichmira W, Moore RD, Leffell MS, Butler NJ, Thorne JE, Flynn JA, Siliciano RF, Blankson JN,


Pohlmeyer CW, Laskey SB, Beck SE, Xu DC, Capoferri AA, Garliss CC, May ME, Livingston A, Lichmira W, Moore RD, Leffell MS, Butler NJ, Thorne JE, Flynn JA, Siliciano RF, Blankson JN, (click to view)

Pohlmeyer CW, Laskey SB, Beck SE, Xu DC, Capoferri AA, Garliss CC, May ME, Livingston A, Lichmira W, Moore RD, Leffell MS, Butler NJ, Thorne JE, Flynn JA, Siliciano RF, Blankson JN,

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PloS one 2018 02 2113(2) e0192098 doi 10.1371/journal.pone.0192098

Abstract

Heterologous immunity is an important aspect of the adaptive immune response. We hypothesized that this process could modulate the HIV-1-specific CD8+ T cell response, which has been shown to play an important role in HIV-1 immunity and control. We found that stimulation of peripheral blood mononuclear cells (PBMCs) from HIV-1-positive subjects with microbial peptides that were cross-reactive with immunodominant HIV-1 epitopes resulted in dramatic expansion of HIV-1-specific CD8+ T cells. Interestingly, the TCR repertoire of HIV-1-specific CD8+ T cells generated by ex vivo stimulation of PBMCs using HIV-1 peptide was different from that of cells stimulated with cross-reactive microbial peptides in some HIV-1-positive subjects. Despite these differences, CD8+ T cells stimulated with either HIV-1 or cross-reactive peptides effectively suppressed HIV-1 replication in autologous CD4+ T cells. These data suggest that exposure to cross-reactive microbial antigens can modulate HIV-1-specific immunity.

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