High avidity CD8+ T cells efficiently eliminate motile HIV-infected targets and execute a locally focused program of anti-viral function.

ABSTRACT: The dissemination of HIV from an initial site of infection is facilitated by motile HIV-infected CD4(+) T-cells. However, the impact of infected target cell migration on antigen recognition by HIV-specific CD8(+) T-cells is unclear. Using a 3D in vitro model of tissue, we visualized dynamic interactions between HIV-infected or peptide-pulsed CD4(+) T-cells and HIV-specific CD8(+) T-cells. CTLs engaged motile HIV-infected targets, but ∼ 50% of targets broke contact and escaped. In contrast, immobilized target cells were readily killed, indicating target motility directly inhibits CD8(+) T-cell function. Strong calcium signals occurred in CTLs killing a motile target but calcium signaling was weak or absent in CTLs which permitted target escape. Neutralization of adhesion receptors LFA-1 and

SUBMITTER: Foley MH 

PROVIDER: S-EPMC3923750 | biostudies-literature | 2014

REPOSITORIES: biostudies-literature