title: De novo human T-cell leukemia virus type 1 infection of human lymphocytes in NOD-SCID, common gamma-chain knockout mice.
abstract: Human T-cell leukemia virus type 1 (HTLV-1) is the etiologic agent of adult T-cell leukemia, a disease that is triggered after a long latency period. HTLV-1 is known to spread through cell-to-cell contact. In an attempt to study the events in early stages of HTLV-1 infection, we inoculated uninfected human peripheral blood mononuclear cells and the HTLV-1-producing cell line MT-2 into NOD-SCID, common gamma-chain knockout mice (human PBMC-NOG mice). HTLV-1 infection was confirmed with the detection of proviral DNA in recovered samples. Both CD4+ and CD8+ T cells were found to harbor the provirus, although the latter population harbored provirus to a lesser extent. Proviral loads increased with time, and inverse PCR analysis revealed the oligoclonal proliferation of infected cells. Although tax gene transcription was suppressed in human PBMC-NOG mice, it increased after in vitro culture. This is similar to the phenotype of HTLV-1-infected cells isolated from HTLV-1 carriers. Furthermore, the reverse transcriptase inhibitors azidothymidine and tenofovir blocked primary infection in human PBMC-NOG mice. However, when tenofovir was administered 1 week after infection, the proviral loads did not differ from those of untreated mice, indicating that after initial infection, clonal proliferation of infected cells was predominant over de novo infection of previously uninfected cells. In this study, we demonstrated that the human PBMC-NOG mouse model should be a useful tool in studying the early stages of primary HTLV-1 infection.
authors.affiliation: Laboratory of Virus Immunology, Institute for Virus Research, Kyoto University, Shogoin Kawahara-cho 53, Sakyo-ku, Kyoto 606-8507, Japan. mmatsuok@virus.kyoto-u.ac.jp.
authors.forename: Paola
authors.initials: P
authors.lastname: Miyazato
authors.forename: Jun-ichirou
authors.initials: J
authors.lastname: Yasunaga
authors.forename: Yuko
authors.initials: Y
authors.lastname: Taniguchi
authors.forename: Yoshio
authors.initials: Y
authors.lastname: Koyanagi
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Mitsuya
authors.forename: Masao
authors.initials: M
authors.lastname: Matsuoka
mesh_terms: D000818:Animals; D044966:Anti-Retroviral Agents / Q000494:pharmacology; D001483:Base Sequence; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology / Q000821:virology; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology / Q000821:virology; D049109:Cell Proliferation; D019175:DNA Methylation; D004279:DNA, Viral / Q000737:chemistry / Q000235:genetics; D016355:Genes, pX; D015490:HTLV-I Infections / Q000188:drug therapy / Q000276:immunology / Q000473:pathology / Q000821:virology; D015368:Human T-lymphotropic virus 1 / Q000235:genetics / Q000472:pathogenicity* / Q000502:physiology; D006801:Humans; D007142:Immunoglobulin gamma-Chains / Q000235:genetics; D007156:Immunologic Memory; D008214:Lymphocytes / Q000276:immunology / Q000473:pathology / Q000821:virology*; D051379:Mice; D008810:Mice, Inbred C57BL; D016688:Mice, Inbred NOD; D018345:Mice, Knockout; D016513:Mice, SCID
chemical_list: D044966:Anti-Retroviral Agents; D004279:DNA, Viral; D007142:Immunoglobulin gamma-Chains