title: Induction of MHC-IIDR expression on circulating CD8+ lymphocytes in macaques infected with SIVmac239 nef-open but not with its nef-deletion mutant.
abstract: We examined the expression kinetics of activation antigens CD38 and MHC-IIDR (DR) on circulating CD8+ lymphocytes in rhesus macaques infected with pathogenic simian immunodeficiency virus strain SIVmac239 nef-open (239) or its nonpathogenic nef-deletion mutant (delta nef). In the longitudinal study, we found for the first time the induction of DR expression on CD8+ lymphocytes in 239-infected macaques. The induction of DR was in parallel with an increasing viral load and a decreasing CD4+ lymphocyte level. In the macaques with the high viral load and low CD4 level, a considerable proportion of the DR+CD8+ subpopulation was CD69+, indicating an activated state. On the other hand, no significant increase in the DR+CD8+ subpopulation level was observed in delta nef-infected macaques. These data indicate that the evaluation of activation markers such as DR and/or CD69 on circulating CD8+ cells may be valuable as a surrogate marker in the SIV-macaque model.
authors.affiliation: Tsukuba Primate Center, National Institute of Infectious Diseases, Ibaraki, Japan. akari@basic.med.tokushima-u.ac.jp
authors.forename: H
authors.initials: H
authors.lastname: Akari
authors.forename: K
authors.initials: K
authors.lastname: Mori
authors.forename: I
authors.initials: I
authors.lastname: Otani
authors.forename: K
authors.initials: K
authors.lastname: Terao
authors.forename: F
authors.initials: F
authors.lastname: Ono
authors.forename: A
authors.initials: A
authors.lastname: Adachi
authors.forename: Y
authors.initials: Y
authors.lastname: Yoshikawa
mesh_terms: D036541:ADP-ribosyl Cyclase; D051997:ADP-ribosyl Cyclase 1; D000818:Animals; D015703:Antigens, CD; D000943:Antigens, Differentiation / Q000032:analysis; D018791:CD4 Lymphocyte Count; D016516:CD4-CD8 Ratio; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology*; D017353:Gene Deletion; D015693:Gene Products, nef / Q000235:genetics / Q000276:immunology*; D000949:Histocompatibility Antigens Class II / Q000276:immunology*; D008253:Macaca mulatta; D009244:NAD+ Nucleosidase / Q000032:analysis; D016097:Simian Acquired Immunodeficiency Syndrome / Q000276:immunology* / Q000821:virology; D015302:Simian Immunodeficiency Virus / Q000235:genetics / Q000276:immunology*; D019562:Viral Load
chemical_list: D015703:Antigens, CD; D000943:Antigens, Differentiation; D015693:Gene Products, nef; D000949:Histocompatibility Antigens Class II; D036541:ADP-ribosyl Cyclase; D009244:NAD+ Nucleosidase; D051997:ADP-ribosyl Cyclase 1