New Thy-1- and H-2-congenic strains of mice and their application in studies on the mechanism of anti-Thy-1.1 response.

The magnitude of the primary humoral anti-Thy-1.1 responses was measured by the number of PFC in spleens of B10.S(7R) mice and some of their H-2 heterozygous F1 hybrids immunized with thymocytes of either AKR.TH or B10.S(7R)-Thy-1a strain. These two of the five newly developed strains are non-H-2 incompatible and non-H-2 compatible with B10.S(7R) mice, respectively. The low anti-Thy-1.1 responses of B10.S(7R) mice and their F1 hybrids after immunization with thymocytes from non-H-2 compatible B10.S(7R)-Thy-1a donors indicated that the I-As "allele" of B10.S(7R) mice and the I-A "alleles" of other parental strains tested did not produce a complementary effect that is required for non-H-2 compatible thymocytes to elicit a good anti-Thy-1 response.