McKinnon LR, Ball TB, Wachihi C, McLaren PJ, Waruk JL, Mao X, Ramdahin S, Anzala AO, Kamene J, Luo M, Fowke KR, Plummer FA.Epitope cross-reactivity frequently differs between central and effector memory HIV-specific CD8+ T cells. J Immunol. 2007 Mar 15;17

Citation:
O. PROFANZALAAGGREY. "McKinnon LR, Ball TB, Wachihi C, McLaren PJ, Waruk JL, Mao X, Ramdahin S, Anzala AO, Kamene J, Luo M, Fowke KR, Plummer FA.Epitope cross-reactivity frequently differs between central and effector memory HIV-specific CD8+ T cells. J Immunol. 2007 Mar 15;17.". In: J Immunol. 2007 Mar 15;178(6):3750-6. John Benjamins Publishing Company; 2007.

Abstract:

HIV diversity may limit the breadth of vaccine coverage due to epitope sequence differences between strains. Although amino acid substitutions within CD8(+) T cell HIV epitopes can result in complete or partial abrogation of responses, this has primarily been demonstrated in effector CD8(+) T cells. In an HIV-infected Kenyan cohort, we demonstrate that the cross-reactivity of HIV epitope variants differs dramatically between overnight IFN-gamma and longer-term proliferation assays. For most epitopes, particular variants (not the index peptide) were preferred in proliferation in the absence of corresponding overnight IFN-gamma responses and in the absence of the variant in the HIV quasispecies. Most proliferating CD8(+) T cells were polyfunctional via cytokine analyses. A trend to positive correlation was observed between proliferation (but not IFN-gamma) and CD4 counts. We present findings relevant to the assessment of HIV vaccine candidates and toward a better understanding of how viral diversity is tolerated by central and effector memory CD8(+) T cells.

Notes:

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