Transcriptome analysis of primary monocytes shows global down-regulation of genetic networks in HIV viremic patients versus long-term non-progressors

Despite significant contributions of monocytes to HIV persistence, the genomic basis of HIV-infection of monocytes and its association with plasma viremia remain elusive. To understand HIV interactions with monocytes during disease progression, monocytic transcriptomes from long-term non-progressors (LTNP), HIV+ patients with viral load <1000, with viral load>1000, and seronegative controls were analyzed using Illumina microarray. Differentially expressed genes were identified (fold change >2; adjusted p<0.05) and GSEA between HIV+ groups demonstrated that the down-regulation of the pathways including Toll-like receptor (TLR) signaling, cytokine–cytokine receptor interaction, cell cycle and apoptosis was significantly associated with the viremic groups, whereas their up-regulation with the LTNP group. The down-regulation of TLR pathway in the viremic patients was exemplified by the decreased expression of TLR with the subsequent tuning down of MAPK, NF-κB, JAK-STAT, and IRF cascades. These data provide the first transcriptomic distinction between HIV+ progressors and LTNPs based on primary monocytes.

► Down-regulation of the TLR pathway was detected in viremic groups versus LTNPs.
► Down-regulation of cytokine pathway was detected in viremic groups versus LTNPs.
► Down-regulation of cell cycle pathway was detected in viremic groups versus LTNPs.
► Down-regulation of migration pathway was detected in the HVL group (versus INT).