title: Age-dependent hantavirus-specific CD8(+) T-cell responses in mice infected with Hantaan virus.
abstract: To investigate age-dependent differences in hantavirus-specific CD8(+) T-cell responses, mice were inoculated with 0.1 50% newborn mouse lethal dose of Hantaan virus (HTNV) at 0, 3, 7, 14, or 35 days after birth. HTNV-specific CD8(+) T cells producing gamma interferon (IFN-gamma) were measured on day 30 after HTNV inoculation. Although no IFN-gamma-producing HTNV-specific CD8(+) T cells were detected in most of the mice inoculated with HTNV on day 0 after birth, most mice inoculated at 3, 7, 14, or 35 days had HTNV-specific CD8(+) T cells. The production of tumor necrosis factor alpha (TNF-alpha) by IFN-gamma-producing CD8(+) T cells and the cytotoxic activity against HTNV-infected target cells were similar in immature and adult mice. However, the number of IFN-gamma-producing HTNV-specific CD8(+) T cells was significantly less in mice inoculated with HTNV at 3 days than in older mice. In addition, a strong correlation between HTNV persistence and a lack of HTNV-specific CD8(+) T cells was observed. These results suggest that mice over 7 days old have the ability to induce functional HTNV-specific CD8(+) T-cell responses that are indistinguishable from the responses of adult mice, and that HTNV-specific CD8(+) T cells are important for clearance of HTNV.
authors.affiliation: Laboratory of Public Health, Department of Environmental Veterinary Sciences, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Araki
authors.forename: K
authors.initials: K
authors.lastname: Yoshimatsu
authors.forename: B-H
authors.initials: BH
authors.lastname: Lee
authors.forename: M
authors.initials: M
authors.lastname: Okumura
authors.forename: H
authors.initials: H
authors.lastname: Kariwa
authors.forename: I
authors.initials: I
authors.lastname: Takashima
authors.forename: J
authors.initials: J
authors.lastname: Arikawa
mesh_terms: D000375:Aging; D000818:Animals; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology*; D003601:Cytotoxicity Tests, Immunologic; D003602:Cytotoxicity, Immunologic; D004195:Disease Models, Animal; D018063:Hantaan virus / Q000276:immunology*; D006480:Hemorrhagic Fever with Renal Syndrome / Q000276:immunology* / Q000821:virology; D007371:Interferon-gamma / Q000096:biosynthesis; D008168:Lung / Q000821:virology; D008213:Lymphocyte Activation; D051379:Mice; D008807:Mice, Inbred BALB C; D013154:Spleen / Q000166:cytology; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology; D014409:Tumor Necrosis Factor-alpha / Q000096:biosynthesis; D014764:Viral Proteins / Q000032:analysis
chemical_list: D014409:Tumor Necrosis Factor-alpha; D014764:Viral Proteins; D007371:Interferon-gamma