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Laboratoire Associé Institut National de la Recherche Agronomique dImmunologie Parasitaire, Faculté de Pharmacie, Tours, France; and
Department of Medicine and Microbiology, Dartmouth Medical School, Hanover, NH 03756
Toxoplasma gondii Ag-primed intraepithelial
lymphocytes (IEL) from the mouse intestine have been shown to be
protective against an lethal parasite challenge when adoptively
transferred into recipient mice. In the present study, we observed that
Ag-primed IEL traffic to the intestine of naive mice following i.v.
administration. Primed and CD8ß+ IEL were the most
efficient cells at homing to the host organ. In congenic mice, IEL
migrated from intestine within several hours posttransfer. On Ag
reexposure, the primed IEL return to the intestine where they enhance
resistance as determined by reduction in the number of brain cysts.
Treatment of recipient mice with anti-
4 and
anti-
E Abs partially inhibited IEL intestinal
homing. The Ab treatment dramatically impaired resistance to a
subsequent oral infection. These finding indicate that lymphocyte
homing is an important parameter in establishing long term immunity to
recurrent infection with this parasite.
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