Journal Article

CD4 is expressed on a heterogeneous subset of hematopoietic progenitors, which persistently harbor CXCR4 and CCR5-tropic HIV proviral genomes in vivo

Signer, Robert A. J., Taschuk, Frances, Morrison, Sean J., Terry, Valeri, Riddell IV, James, Sebastian, Nadia T., Zaikos, Thomas D., McNamara, Lucy A., Collins, Kathleen L., Bixby, Dale, Markowitz, Norman, Yucha, Ryan, Onafuwa-Nuga, Adewunmi

2017

Overview

Latent HIV infection of long-lived cells is a barrier to viral clearance. Hematopoietic stem and progenitor cells are a heterogeneous population of cells, some of which are long-lived. CXCR4-tropic HIVs infect a broad range of HSPC subtypes, including hematopoietic stem cells, which are multi-potent and long-lived. However, CCR5-tropic HIV infection is limited to more differentiated progenitor cells with life spans that are less well understood. Consistent with emerging data that restricted progenitor cells can be long-lived, we detected persistent HIV in restricted HSPC populations from optimally treated people. Further, genotypic and phenotypic analysis of amplified env alleles from donor samples indicated that both CXCR4- and CCR5-tropic viruses persisted in HSPCs. RNA profiling confirmed expression of HIV receptor RNA in a pattern that was consistent with in vitro and in vivo results. In addition, we characterized a CD4high HSPC sub-population that was preferentially targeted by a variety of CXCR4- and CCR5-tropic HIVs in vitro. Finally, we present strong evidence that HIV proviral genomes of both tropisms can be transmitted to CD4-negative daughter cells of multiple lineages in vivo. In some cases, the transmitted proviral genomes contained signature deletions that inactivated the virus, eliminating the possibility that coincidental infection explains the results. These data support a model in which both stem and non-stem cell progenitors serve as persistent reservoirs for CXCR4- and CCR5-tropic HIV proviral genomes that can be passed to daughter cells.

• Publisher: Public Library of Science,Public Library of Science (PLoS)
• Subject: Adult / Biology and Life Sciences / CCR5 protein / CD4 antigen / CD4 Antigens - genetics / CD4 Antigens - metabolism / Cells (biology) / Cells, Cultured / CXCR4 protein / Deoxyribonucleic acid / DNA / Female / Funding / Gene expression / Genetic aspects / Genome, Viral / Genomes / Hematopoietic stem cells / Hematopoietic Stem Cells - metabolism / Hematopoietic Stem Cells - virology / HIV / HIV Infections - genetics / HIV Infections - metabolism / HIV Infections - virology / HIV-1 - genetics / HIV-1 - physiology / Human immunodeficiency virus / Humans / Immunology / In vitro methods and tests / Infections / Infectious diseases / Internal medicine / Male / Medicine / Medicine and Health Sciences / Mitochondrial DNA / Molecular biology / Pediatrics / Proviruses - genetics / Proviruses - physiology / Receptors, CCR5 - genetics / Receptors, CCR5 - metabolism / Receptors, CXCR4 - genetics / Receptors, CXCR4 - metabolism / Receptors, HIV - genetics / Receptors, HIV - metabolism / Research and Analysis Methods / Ribonucleic acid / RNA / RNA viruses / Stem cells / Virology / Viruses / Young Adult