title: Infection of natural killer cells by human herpesvirus 6.
abstract: Natural killer (NK) cells are a functionally defined subset of non-T, non-B lymphocytes of bone marrow origin, which induce lysis of selected target cells, including neoplastic and virus-infected cells. The NK cell function provides an important mechanism of primary defence against viruses in vivo, as demonstrated by the occurrence of multiple herpesvirus infections in patients congenitally lacking NK cells. Here we show that functionally competent CD3- NK clones can be productively infected by human herpesvirus 6 (HHV-6), a T-lymphotropic DNA virus that may play a role in the acquired immunodeficiency syndrome (AIDS) and in the chronic fatigue syndrome, two disorders associated with a defective NK cell activity. The infection is cytopathic and induces de novo expression of CD4, an antigen not expressed within the NK lineage, thereby predisposing NK cells to infection by human immunodeficiency virus type 1 (HIV-1). These results provide evidence that a herpesvirus can directly target and kill NK cells, a potential strategy to suppress the natural anti-viral immunity of the host.
authors.affiliation: Laboratory of Tumor Cell Biology, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892.
authors.forename: P
authors.initials: P
authors.lastname: Lusso
authors.forename: M S
authors.initials: MS
authors.lastname: Malnati
authors.forename: A
authors.initials: A
authors.lastname: Garzino-Demo
authors.forename: R W
authors.initials: RW
authors.lastname: Crowley
authors.forename: E O
authors.initials: EO
authors.lastname: Long
authors.forename: R C
authors.initials: RC
authors.lastname: Gallo
mesh_terms: D000328:Adult; D015703:Antigens, CD / Q000032:analysis; D000945:Antigens, Differentiation, T-Lymphocyte / Q000032:analysis; D001483:Base Sequence; D017252:CD3 Complex / Q000032:analysis; D015704:CD4 Antigens / Q000096:biosynthesis; D019002:CD56 Antigen; D002460:Cell Line; D002478:Cells, Cultured; D005434:Flow Cytometry; D015654:Herpesvirus 6, Human / Q000235:genetics / Q000276:immunology* / Q000302:isolation & purification; D006801:Humans; D007694:Killer Cells, Natural / Q000276:immunology / Q000382:microbiology* / Q000648:ultrastructure; D008854:Microscopy, Electron; D008969:Molecular Sequence Data; D009838:Oligodeoxyribonucleotides; D015345:Oligonucleotide Probes; D016133:Polymerase Chain Reaction / Q000379:methods
chemical_list: D015703:Antigens, CD; D000945:Antigens, Differentiation, T-Lymphocyte; D017252:CD3 Complex; D015704:CD4 Antigens; D019002:CD56 Antigen; D009838:Oligodeoxyribonucleotides; D015345:Oligonucleotide Probes