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The Journal of Immunology, 1999, 162: 5846-5852.
Copyright © 1999 by The American Association of Immunologists

Intraepithelial Lymphocytes Traffic to the Intestine and Enhance Resistance to Toxoplasma gondii Oral Infection1

Dominique Buzoni-Gatel2,*, Hajer Debbabi{dagger}, Magali Moretto{dagger}, Isabelle H. Dimier-Poisson*, Anne C. Lepage{dagger}, Daniel T. Bout* and Lloyd H. Kasper{dagger}

* Laboratoire Associé Institut National de la Recherche Agronomique d’Immunologie Parasitaire, Faculté de Pharmacie, Tours, France; and {dagger} 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-{alpha}4 and anti-{alpha}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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