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Transfection of cells with the H-2Kk gene lacking the transmembrane and cytoplasmic segments resulted in secretion of the H-2Kk protein, as determined by immunoprecipitation with monoclonal anti-H-2Kk antibodies. Transgenic (H-2b X H-2d)F1 mice were established carrying integrated copies of the modified H-2Kk gene. Expression of the soluble H-2Kk antigen in the transgenic mice was demonstrated in cell supernatants of biosynthetically labeled splenic and thymic Con A blasts as well as bone marrow-derived macrophages. Soluble H-2Kk molecules were also present in the sera of the transgenic animals. No cell-surface expression of the H-2Kk antigen could be observed. In spite of the presence of the soluble H-2Kk molecules in the transgenic mice, the animals were able to generate H-2Kk-specific cytolytic T cells as well as antibody responses when stimulated with cell-surface-bound H-2Kk antigens. These responses were indistinguishable from those of the nontransgenic littermates. Possible explanations for the observed lack of tolerance are discussed.

Alloreactive immune responses of transgenic mice expressing a foreign transplantation antigen in a soluble form.