Effects of depletion of T cell subpopulations on the course of infection and anti-parasite delayed type hypersensitivity response in mice infected with Babesia microti and Babesia rodhaini.
To elucidate the role of T cell subpopulations in the protective cell-mediated immune response at the initial phase of infection with Babesia microti (BM) and B. rodhaini (BR), the changes in the course of infection and anti-parasite delayed type hypersensitivity (DTH) response after BM or BR inoculation were investigated in Lyt-2+ T cell or L3T4+ T cell-depleted mice. Depletion of Lyt-2+ T cells strongly enhanced the resistance to BM infection, whereas it increased the susceptibility to BR infection. In contrast, depletion of L3T4+ T cells increased susceptibility to BM infection, while it enhanced resistance to BR infection. The anti-parasite DTH response in BM-infected mice was significantly enhanced by depletion of Lyt-2+ T cells, while significantly reduced by depletion of L3T4+ T cells. No effects of depletion of either Lyt-2+ or L3T4+ cells on DTH response was observed in BR-infected mice. From these results, it was suggested that the roles of Lyt-2+ and L3T4+ T cells in the protective cell-mediated immune response at the initial phase of infection were different between BM- and BR-infected mice, resulting in the difference in their course of infection.
Shimada
T
T
Department of Veterinary Clinical Pathobiology, Faculty of Agriculture, University of Tokyo, Japan.
Shikano
S
S
Hashiguchi
R
R
Matsuki
N
N
Ono
K
K
D000818:Animals; D000950:Antigens, Ly; D001403:Babesia / Q000276:immunology*; D001404:Babesiosis / Q000276:immunology*; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology; D004198:Disease Susceptibility; D006968:Hypersensitivity, Delayed; D007113:Immunity, Innate; D008212:Lymphocyte Depletion; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D018512:Parasitemia / Q000276:immunology; D016176:T-Lymphocyte Subsets / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology*; D013997:Time Factors
D000950:Antigens, Ly