title: Comparison of susceptibility to SIVmac239 infection between CD4(+) and CD4(+)8(+) T cells.
abstract: CD4-bearing T cells are the primary targets for human immunodeficiency virus type 1(HIV-1)/simian immunodeficiency virus (SIV) infection. However, it is unclear whether the susceptibility of CD4-bearing T cells including CD4 single positive and CD4/8 double positive T cells to HIV/SIV infection is the same or not. In this study, we compared the susceptibility to SIV infection between CD4(+) and CD4(+)8(+) T cells, using Herpesvirus saimiri (HVS)-transformed CD4(+) and CD4(+)8(+) T cells established from peripheral blood mononuclear cells (PBMC) of rhesus macaques. Although there was little difference between the two CD4-bearing T cell population in the expression level of CD4 molecules and chemokine receptors such as CXCR4 and CCR5, SIV replicated more efficiently in CD4(+)8(+) T cells than in CD4(+) T cells. Moreover, we found that reverse transcription initiated more efficiently in CD4(+)8(+) T cells than in CD4(+) T cells and that the cell lysates from CD4(+) T cells impaired the RT activity more strongly than that from CD4(+)8(+) T cells. These findings suggest that intracellular environment in CD4(+) 8(+) T cells is better for reverse transcription and that the infection of those CD4(+)8(+) T cells might play critical and different roles in HIV-1/SIV infection and dissemination.
authors.affiliation: Department of Microbiology and Immunology, Nippon Medical School, Tokyo, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Takahashi
authors.forename: E
authors.initials: E
authors.lastname: Ido
authors.forename: H
authors.initials: H
authors.lastname: Uesaka
authors.forename: T
authors.initials: T
authors.lastname: Fukushima
authors.forename: K
authors.initials: K
authors.lastname: Ibuki
authors.forename: T
authors.initials: T
authors.lastname: Miura
authors.forename: M
authors.initials: M
authors.lastname: Hayami
authors.forename: H
authors.initials: H
authors.lastname: Takahashi
mesh_terms: D000818:Animals; D015704:CD4 Antigens / Q000096:biosynthesis; D015496:CD4-Positive T-Lymphocytes / Q000821:virology*; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology / Q000821:virology*; D002461:Cell Line, Transformed; D004198:Disease Susceptibility; D015967:Gene Expression Regulation, Viral; D008253:Macaca mulatta; D048348:Reverse Transcription; D016097:Simian Acquired Immunodeficiency Syndrome / Q000821:virology*; D015302:Simian Immunodeficiency Virus / Q000235:genetics / Q000502:physiology*; D014779:Virus Replication
chemical_list: D015704:CD4 Antigens