[HTML][HTML] Circulating CXCR5+ CXCR3+ PD-1lo Tfh-like cells in HIV-1 controllers with neutralizing antibody breadth

E Martin-Gayo, J Cronin, T Hickman, Z Ouyang… - JCI insight, 2017 - ncbi.nlm.nih.gov
E Martin-Gayo, J Cronin, T Hickman, Z Ouyang, M Lindqvist, KE Kolb, JS Zur Wiesch
JCI insight, 2017ncbi.nlm.nih.gov
HIV-1–specific broadly neutralizing antibodies (bnAbs) typically develop in individuals with
continuous high-level viral replication and increased immune activation, conditions that
cannot be reproduced during prophylactic immunization. Understanding mechanisms
supporting bnAb development in the absence of high-level viremia may be important for
designing bnAb-inducing immunogens. Here, we show that the breadth of neutralizing
antibody responses in HIV-1 controllers was associated with a relative enrichment of …
Abstract
HIV-1–specific broadly neutralizing antibodies (bnAbs) typically develop in individuals with continuous high-level viral replication and increased immune activation, conditions that cannot be reproduced during prophylactic immunization. Understanding mechanisms supporting bnAb development in the absence of high-level viremia may be important for designing bnAb-inducing immunogens. Here, we show that the breadth of neutralizing antibody responses in HIV-1 controllers was associated with a relative enrichment of circulating CXCR5+ CXCR3+ PD-1 lo CD4+ T cells. These CXCR3+ PD-1 lo Tfh-like cells were preferentially induced in vitro by functionally superior dendritic cells from controller neutralizers, and able to secrete IL-21 and support B cells. In addition, these CXCR3+ PD-1 lo Tfh-like cells contained higher proportions of stem cell–like memory T cells, and upon antigenic stimulation differentiated into PD-1 hi Tfh-like cells in a Notch-dependent manner. Together, these data suggest that CXCR5+ CXCR3+ PD-1 lo cells represent a dendritic cell–primed precursor cell population for PD-1 hi Tfh-like cells that may contribute to the generation of bnAbs in the absence of high-level viremia.
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