CD8+ CTLs are essential for protective immunity against Encephalitozoon cuniculi infection.
Encephalitozoon cuniculi is a protozoan parasite that has been implicated recently as a cause of opportunistic infection in immunocompromised individuals. Protective immunity in the normal host is T cell-dependent. In the present study, the role of individual T cell subtypes in immunity against this parasite has been studied using gene knockout mice. Whereas CD4-/- animals resolved the infection, mice lacking CD8+ T cells or perforin gene succumbed to parasite challenge. The data obtained in these studies suggest that E. cuniculi infection induces a strong and early CD8+ T response that is important for host protection. The CD8+ T cell-mediated protection depends upon the CTL activity of this cell subset, as the host is rendered susceptible to infection in the absence of this function. This is the first report in which a strong dependence upon the cytolytic activity of host CD8+ T cells has been shown to be important in a parasite infection.
Khan
I A
IA
Departments ofMedicine and Microbiology and Pathology, Dartmouth Medical School, Lebanon, NH 03756, USA. Imtiaz.Khan@dartmouth.edu
Schwartzman
J D
JD
Kasper
L H
LH
Moretto
M
M
D000818:Animals; D016827:CD8 Antigens / Q000235:genetics / Q000276:immunology*; D003602:Cytotoxicity, Immunologic; D009670:Encephalitozoon cuniculi / Q000276:immunology*; D016890:Encephalitozoonosis / Q000276:immunology* / Q000401:mortality / Q000517:prevention & control; D008213:Lymphocyte Activation; D008562:Membrane Glycoproteins; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D054353:Perforin; D010641:Phenotype; D052899:Pore Forming Cytotoxic Proteins; D013154:Spleen / Q000166:cytology; D016176:T-Lymphocyte Subsets / Q000276:immunology; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology*
D016827:CD8 Antigens; D008562:Membrane Glycoproteins; D052899:Pore Forming Cytotoxic Proteins; D054353:Perforin