title: Electrophoretic analysis of human herpesvirus 6 polypeptides immunoprecipitated from infected cells with human sera.
abstract: Proteins of human herpesvirus 6 (HHV-6) eliciting human antibody responses were examined in serum from healthy adults and patients with AIDS, chronic fatigue syndrome, Hodgkin's disease, and Sjögren's syndrome. HHV-6 IgG antibody titers measured by immunofluorescence (IF) ranged from 1:10 to 1:1280. Lysates of HHV-6-infected and uninfected cells labeled with [35S]methionine, [3H]glucosamine, and 125I were immunoprecipitated with sera and analyzed electophoretically. Sera with IF titers greater than or equal to 1:20 immunoprecipitated greater than 20 [35S]methionine-labeled HHV-6 polypeptides of approximately 26-180 kDa. At least 10 HHV-6 glycoproteins and 8 HHV-6 polypeptides associated with the surfaces of infected cells were recognized by human sera. The approximate molecular masses of glycoproteins immunoprecipitated by human sera were similar to those immunoprecipitated by monoclonal antibodies. The labeling intensity of HHV-6 protein bands increased with increasing IF titer, and the effect was most prominent for HHV-6 glycopolypeptides. No reactivities with specific HHV-6 polypeptide(s) were characteristic of a given patient group. These findings suggest that HHV-6 glycoproteins are good targets for human antibody responses.
authors.affiliation: Department of Microbiology, Molecular Genetics, and Immunology, University of Kansas Medical Center, Kansas City 66103.
authors.forename: N
authors.initials: N
authors.lastname: Balachandran
authors.forename: S
authors.initials: S
authors.lastname: Tirawatnapong
authors.forename: B
authors.initials: B
authors.lastname: Pfeiffer
authors.forename: D V
authors.initials: DV
authors.lastname: Ablashi
authors.forename: S Z
authors.initials: SZ
authors.lastname: Salahuddin
mesh_terms: D000328:Adult; D000914:Antibodies, Viral / Q000276:immunology*; D000956:Antigens, Viral / Q000032:analysis; D002460:Cell Line; D003720:Densitometry; D004591:Electrophoresis, Polyacrylamide Gel; D005455:Fluorescent Antibody Technique; D015654:Herpesvirus 6, Human / Q000276:immunology*; D006801:Humans; D007106:Immune Sera / Q000276:immunology; D010455:Peptides / Q000032:analysis; D015531:Radioimmunoprecipitation Assay; D014764:Viral Proteins / Q000032:analysis* / Q000276:immunology
chemical_list: D000914:Antibodies, Viral; D000956:Antigens, Viral; D007106:Immune Sera; D010455:Peptides; D014764:Viral Proteins