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Graft-vs.-host-associated immune suppression is activated by recognition of allogeneic murine I-A antigens
Several combinations of F1 hybrid mice were injected intravenously with parental spleen cells to determine the minimal H-2 differences between F1 and parent that are necessary to induce graft-vs.-host-associated immune suppression (GVH-associated suppression). 7-14 d after injection, the spleens of the F1 mice were tested for cytotoxic T lymphocyte potential by in vitro sensitization against trinitrophenyl-self and H-2 alloantigens. The results indicate that parental T lymphocytes must recognize I-A allogeneic determinants of the F1 recipient in order to induce suppression. Recognition of K or D alone or D with I region products other than I-A did not induce suppression. The recognition of I region without K and/or D and even the I-A difference between C57BL/6 and the B6.Cbm12 mutation resulted in immune suppression that was as potent as that resulting from the recognition of K, D, and I together. The possible significance of this function for I-A antigens is discussed with respect to three clinical examples of immune suppression for which this phenomenon may be relevant.
Several combinations of F1 hybrid mice were injected intravenously with parental spleen cells to determine the minimal H-2 differences between F1 and parent that are necessary to induce graft-vs.-host-associated immune suppression (GVH-associated suppression). 7-14 d after injection, the spleens of the F1 mice were tested for cytotoxic T lymphocyte potential by in vitro sensitization against trinitrophenyl-self and H-2 alloantigens. The results indicate that parental T lymphocytes must recognize I-A allogeneic determinants of the F1 recipient in order to induce suppression. Recognition of K or D alone or D with I region products other than I-A did not induce suppression. The recognition of I region without K and/or D and even the I-A difference between C57BL/6 and the B6.Cbm12 mutation resulted in immune suppression that was as potent as that resulting from the recognition of K, D, and I together. The possible significance of this function for I-A antigens is discussed with respect to three clinical examples of immune suppression for which this phenomenon may be relevant.