title: Progression to the G1b phase of the cell cycle is required for completion of human immunodeficiency virus type 1 reverse transcription in T cells.
abstract: Successful infection by human immunodeficiency virus type 1 (HIV-1) requires the activation of target cells. Infection of quiescent peripheral CD4 lymphocytes by HIV-1 results in incomplete, labile, reverse transcripts. In the present study, we isolated highly purified quiescent T cells and utilized the CD3/CD28 activation pathways as well as cell cycle inhibitors to further define the role of costimulation and cell cycle progression in HIV-1 reverse transcription. Activation with alphaCD3 alone resulted in cell cycle progression into only G1a and incomplete HIV-1 reverse transcription. Costimulation through the CD28 receptor and transition into G1b was required to efficiently complete the reverse transcription process. These findings have relevance to immune activation in vivo, since lymphocytes rendered anergic by a single activation signal would be nonpermissive for productive infection with HIV-1. Importantly, these data also suggest that HIV vector-based genetic transduction strategies might be successful only in target cells that transition into the G1b phase of the cell cycle.
authors.affiliation: Department of Pathology and Laboratory Medicine, University of California, Los Angeles, School of Medicine, 90095, USA.
authors.forename: Y D
authors.initials: YD
authors.lastname: Korin
authors.forename: J A
authors.initials: JA
authors.lastname: Zack
mesh_terms: D017252:CD3 Complex / Q000378:metabolism*; D016827:CD8 Antigens / Q000378:metabolism*; D002453:Cell Cycle; D016193:G1 Phase; D054303:HIV Reverse Transcriptase / Q000378:metabolism*; D015497:HIV-1 / Q000201:enzymology* / Q000502:physiology; D006801:Humans; D008934:Mitogens / Q000494:pharmacology; D013601:T-Lymphocytes / Q000166:cytology* / Q000187:drug effects / Q000378:metabolism*
chemical_list: D017252:CD3 Complex; D016827:CD8 Antigens; D008934:Mitogens; D054303:HIV Reverse Transcriptase