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,

*
Immunology Graduate Program,
Center for Immunology, and
Howard Hughes Medical Institute, University of Texas Southwestern Medical Center, Dallas Texas 75235; and
§
Unité dImmunité Cellulaire Antivirale, Institut Pasteur, Paris, France
MHC class Ia-deficient mice (H2 Kb-/- Db-/-) inoculated with the intracellular pathogen Listeria monocytogenes (LM) displayed a three- to fourfold expansion of splenic CD8+ T cells 6 days following infection. Culture of these spleen cells in vitro gave rise to CTL that recognized LM-infected target cells and were restricted by the class Ib molecules, Qa1b and M3. Exposure of target cells to heat-killed LM (HKLM) rather than live bacteria did not result in CTL-mediated lysis. Target cells pulsed with three LM peptides known to bind M3, f-MIGWII, f-MIVTLF, and f-MIVIL, were recognized by effector cells from both B6 and Kb-/- Db-/- animals. In vivo analysis showed that B6 and Kb-/- Db-/- mice clear LM from the spleen and liver rapidly with similar kinetics, whereas TAP.1-/- mice, which are deficient in class Ia and Ib molecules, clear LM slowly upon infection. To establish the in vivo role of CD8+ T cells in Kb-/- Db-/- animals, we showed that depletion of such cells from the spleens of immune mice prevented the adoptive transfer of protective immunity to syngeneic recipients. Spleen cells from Kb-/- Db-/- mice were also capable of generating responses directed against syngeneic as well as allogeneic class Ia molecules in vitro. Thus, class Ia-deficient animals have a CD8+ T cell repertoire capable of recognizing both class Ia and class Ib molecules and can generate protective immunity to LM.
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