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- W2167871471 abstract "A cellfree extract prepared from the spleen cells of C3H mice is capable of suppressing antibody responses to SRBC when extract material is exposed to alloantigens. The observed immunosuppression was attributed to a soluble factor in the extract. This allogeneic suppressive factor (ASF) was detected in extracts prepared from the spleen cells of unirradiated mice as well as those of irradiated mice repopulated with thymocytes, provided that mice were previously immunized with SRBC. Donors of actively suppressive ASF preparations did not need to be previously exposed to alloantigens. Extracts from thymus and marrow cells of unirradiated mice and the spleen cells of irradiated mice repopulated with marrow cells (or no cells) did not contain ASF. C3H thymocytes stimulated with SRBC generated more ASF activity in spleens of C3BF1 hosts than in those of C3H hosts, indicating that alloantigenic stimulation enhances the production or activity of ASF. Once produced, C3H ASF was able to suppress antibody responses in cell transfer experiments only if exposed to C3BF alloantigens of either donor lymphoid cells or irradiated hosts. Once exposed to alloantigens, ASF appears to be capable of suppressing antibody responses of syngeneic C3H or semi-allogeneic C3BF cells. When both donor lymphoid cells and hosts were syngeneic with the donor of the ASF, there was enhancement of antibody formation in cell transfer experiments. C3H ASF did not interfere with education of C3BF thymocytes to SRBC or with the generation of precursors of anti-SRBC antibody-forming cells by C3BF1 marrow cells. ASF may interfere with cellular cooperative events necessary for humoral immune responses or with terminal differentiation of B cells. Production of ASF could partially account for the suppression of antibody responses observed during graft-vs-host reactions." @default.
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- W2167871471 date "1976-06-01" @default.
- W2167871471 modified "2023-09-23" @default.
- W2167871471 title "Suppression of antibody responses in allogeneic mice by products of lymphoid tissue. I. Allogeneic suppressive factor (ASF) from spleens repopulated with thymus cells." @default.
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