CD4 T cell counts are inversely correlated with anti-cluster A antibodies in antiretroviral therapy-treated PLWH
Benlarbi, M.; Richard, J.; Clemente, T.; Bourassa, C.; Tolbert, W. D.; Gottumukkala, S.; Peet, M.-M.; Medjahed, H.; Pazgier, M.; Maldarelli, F.; Castagna, A.; Durand, M.; Finzi, A.
Show abstract
While antiretroviral therapy efficiently suppresses viral replication, inflammation and immune dysfunction persist in some people living with HIV-1 (PLWH). Soluble gp120 (sgp120) has been detected in PLWH plasma and its presence is linked to immune dysfunction. It was reported that sgp120 binding to CD4 on uninfected bystander CD4+ T cells sensitizes them to antibody-dependent cellular-cytotoxicity (ADCC) mediated by non-neutralizing antibodies present in PLWH plasma. Using three independent PLWH cohorts, we observed that non-neutralizing anti-cluster A antibodies are negatively associated with CD4+ T cell counts. Anti-CD4BS antibodies blocked the coating of uninfected bystander cells by sgp120, thereby preventing their elimination by ADCC. Supporting a protective role of anti-CD4BS antibodies, PLWH having these antibodies didnt show a negative association between CD4 T cell counts and anti-cluster A. Our results reveal that anti-cluster A antibodies are associated with immune dysfunction in PLWH and anti-CD4BS antibodies might have a beneficial impact in these individuals.
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