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Hypoxia enhances antibody-dependent dengue virus infection

ABSTRACT: This project aims to investigate the effects of 3% oxygen environments on THP-1 cells as compared to 20% oxygen environments. THP-1 cells (pre-seed) were divided into 2 different conditions and cultured in 20% and 3% oxygen environments for 24h. Samples were performed in triplicates.

ORGANISM(S): Homo sapiens

SUBMITTER: Esther Gan Shuyi

PROVIDER: E-MTAB-4692 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Cross-reactive antibodies enhance live attenuated virus infection for increased immunogenicity

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Project description:Foraminifera from oxygen-depleted environments in Sweden

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Hypoxia enhances antibody-dependent dengue virus infection.

Project description:Dengue virus (DENV) has been found to replicate in lymphoid organs such as the lymph nodes, spleen, and liver in post-mortem analysis. These organs are known to have low oxygen levels (~0.5-4.5% O2) due to the vascular anatomy. However, how physiologically low levels of oxygen affect DENV infection via hypoxia-induced changes in the immune response remains unknown. Here, we show that monocytes adapted to 3% O2 show greater susceptibility to antibody-dependent enhancement of DENV infection. Low oxygen level induces HIF1α-dependent upregulation of fragment crystallizable gamma receptor IIA (FcγRIIA) as well as HIF1α-independent alterations in membrane ether lipid concentrations. The increased FcγRIIA expression operates synergistically with altered membrane composition, possibly through increase membrane fluidity, to increase uptake of DENV immune complexes for enhanced infection. Our findings thus indicate that the increased viral burden associated with secondary DENV infection is antibody-dependent but hypoxia-induced and suggest a role for targeting hypoxia-induced factors for anti-dengue therapy.

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