Three immunoregulatory signatures define non-productive HIV infection in CD4 ⁺ T memory stem cells

The persistent HIV reservoir constitutes the main obstacle to curing HIV/AIDS disease. Our understanding of how non-productive HIV infections are established in primary human CD4 ⁺ T cells during the first round of infection remains, however, incomplete. In this study, we leveraged the HIV reporter virus pMorpheus-V5 to delineate cellular expression patterns that are upregulated in non-productively infected primary CD4 ⁺ T memory stem cells (T _SCM ). We found that CD4 ⁺ T _SCM harboring non-productive proviruses displayed a distinct transcriptomic signature comprising 118 upregulated genes. This non-productive expression profile was distinct from that of productively infected cells as well as from negative-exposed and mock-infected cells. Among the cellular genes most upregulated in CD4 ⁺ T cells harboring non-productive proviruses were CCR4-binding migratory chemokines ( <i>CCL22, CCL17</i> ), tryptophan catabolic enzymes ( <i>IDO1, KYNU</i> ), and genes encoding cytoskeletal rearrangement proteins ( <i>BASP1, TNFAIP2</i> ). Intracellular flow cytometry-based analyses confirmed that non-productively infected CD4 ⁺ T _SCM cells were enriched for CCL22 and IDO1 co-expression compared to the other CD4 ⁺ memory subsets, underscoring a clear CD4 ⁺ T cell subset specificity for the upregulation of these two immune gene sets associated with non-productive infections. These findings suggest that primary human CD4 ⁺ T _SCM harboring non-productive proviruses display a distinct immunoregulatory phenotype which may facilitate immune evasion and contribute to the persistence of the HIV reservoir.