By Henry G. Kunkel, Frank J. Dixon (Eds.)
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Extra resources for Advances in Immunology, Vol. 33
Studies on adult immune-defective F, male mice indicate that approximately 10% of the B cells of adult were CR+, whereas 50% of F, female B cells bore this receptor (J. Mond, A. Ahmed, and I. Scher, unpublished data). These findings are in agreement with another study which showed that the percentage of CR+ lymphocyte was lower in the spleens of CBA/N than in normal CBA control mice (Lindsten and Andersson, 1981). Thus, when antibody and complement-coated erythrocytes (EAC) were utilized that were made with different dilutions of sera containing complement, the percentage of CR+ lymphocytes was 38 vs 27,36 vs 27, and 37 vs 13 at 1:4, 1:20, and 1: 40 serum dilutions in CBA and CBNN mice, respectively.
Furthermore, Kearney et al. (1977) demonstrated that a large proportion of surface IgM-bearing fetal spleen and adult bone marrow cells was surface Ia-. The similarity of the surface Ig characteristics of immune-defective CBA/N adult B cells to those of neonatal normal B cells suggested that there might be a high percentage of surface Ia- cells among the surface IgMbearing B cells of adult CBNN mice. , 1980). The frequencies of surface Ia- and surface IgM-bearing cells in the lymphoid organs of adult immunedefective F, male mice were virtually identical, demonstrating that there was no increase in the proportion of p+Ia- cells in these mice.
These antigens appear early in the differentiation of B cells, since Ia antigens are found on the surface of B cells derived from neonatal and adult bone marrow as well as neonatal spleen cells. These p+Ia- bone marrow cells expressed Ia after stimulation with LPS, a phenomenon which was suppressed if the cells were first treated with anti-Ig antibodies + C. Furthermore, Kearney et al. (1977) demonstrated that a large proportion of surface IgM-bearing fetal spleen and adult bone marrow cells was surface Ia-.