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The Journal of Immunology, Vol 140, Issue 11 3943-3946, Copyright © 1988 by American Association of Immunologists
ARTICLES |
Y Suzuki and JS Remington
Department of Immunology and Infectious Diseases, Palo Alto Medical Foundation, CA 94301.
Studies were performed to attempt to define the T cell subset responsible for resistance to Toxoplasma gondii. A temperature- sensitive mutant (ts-4) strain of T. gondii was used for immunization because it causes infection but does not persist in the host. Immunization with this strain induced marked resistance against lethal challenge infection with virulent strains of T. gondii in mice. The resistance could be transferred to normal recipient mice by i.v. injection of spleen cells from ts-4-immunized mice. Marked inhibition of cyst formation in the recipient mice was also noted. The protective activity of immune spleen cells was removed by pretreatment of the spleen cells with anti-Thy-1.2 and C, indicating that T cells are responsible for the observed protection. Pretreatment of immune spleen cells with anti-Lyt-2.2 and C completely ablated their protective effect; pretreatment with anti-Lyt-1.2 or anti-L3T4 and C had lesser effects on their ability to transfer resistance. The effect of anti-Lyt- 1.2 was the same as that obtained with anti-L3T4. This suggested that one T cell subset that is partially responsible for protection has both Lyt-1.2 and L3T4 markers on the cell surface. These results indicate that there are substantial roles for both the Lyt-2+ and Lyt-1+, L3T4 T cell subsets in dual regulation of resistance against toxoplasma infection and that Lyt-2+ T cells are the principal mediator of the resistance.
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