Protein-specific cytotoxic T lymphocytes. Recognition of transfectants expressing intracellular, membrane-associated or secreted forms of beta-galactosidase.
BALB/c-derived tumor cells were transfected with recombinant Escherichia coli beta-galactosidase (beta-gal) genes which were inserted into IgM heavy chain gene derivatives, leading to expression of the resulting fusion protein in different cellular compartments. A beta-gal-specific, major histocompatibility complex (MHC) class I-restricted CD8+CD4- cytotoxic T lymphocyte (CTL) line of BALB/c origin raised against one transfectant expressing cytoplasmic beta-gal also lysed transfectants expressing beta-gal as membrane-inserted fusion protein, as well as transfectants secreting beta-gal. Our data show that MHC class I-restricted CTL can recognize fragments of nonviral cellular proteins, be they expressed as intracellular, membrane-inserted, or secreted products. The findings confirm and extend a hypothesis on the nature of minor histocompatibility (H) antigens formulated earlier.
Rammensee
H G
HG
Max-Planck-Institut für Biologie, Abteilung Immungenetik, Tübingen, Federal Republic of Germany.
Schild
H
H
Theopold
U
U
D000818:Animals; D004926:Escherichia coli / Q000201:enzymology; D005696:Galactosidases / Q000096:biosynthesis*; D007075:Immunoglobulin M / Q000235:genetics; D066298:In Vitro Techniques; D051379:Mice; D008807:Mice, Inbred BALB C; D010957:Plasmids; D013602:T-Lymphocytes, Cytotoxic / Q000502:physiology*; D014162:Transfection; D001616:beta-Galactosidase / Q000096:biosynthesis* / Q000235:genetics
D007075:Immunoglobulin M; D005696:Galactosidases; D001616:beta-Galactosidase