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. 1968 Oct;96(4):1124–1132. doi: 10.1128/jb.96.4.1124-1132.1968

Depressed Cellular Formation of Antibody to Shigella Antigens In Vitro by Spleen Cell Cultures from Unresponsive Mice

Herman Friedman 1
PMCID: PMC252425  PMID: 5685992

Abstract

Specific antibody plaque-forming cells (PFC) to Shigella-soluble antigen did not appear in spleen cell cultures from Shigella-tolerant mice, as occurred with similar cultures prepared from normal mice immunized with Shigella antigen prior to sacrifice. Cultures from tolerant mice also failed to form serologically detectable amounts of agglutinins in vitro. Exposure of cell cultures from tolerant mice in vitro to additional antigen had little or no effect on appearance of plaque-forming cells to Shigella. Spleen cells from normal control mice formed readily detectable levels of antibody, as well as specific antibody plaque-forming cells, after similar stimulation with antigen either in vivo or in vitro. The absence of antibody-forming cells in cultures prepared from spleens of tolerant mice was specific since such cultures, as well as those from normal control mice, formed numerous antibody plaques to unsensitized sheep erythrocytes in vitro after in vivo challenge of the mice with sheep erythrocytes. Tolerance to Shigella antigen, as assessed by absence of antibody-forming cells in vitro, persisted for several months. Spleen cell cultures from tolerant mice less than 3 to 4 months of age did not form significant numbers of antibody plaques, even after in vitro exposure to specific antigen. However, spleen cultures prepared from neonatally treated mice, approximately 6 to 8 months old, formed essentially normal numbers of specific PFC in vitro, indicating that the animals had “recovered” from tolerance and that their lymphoid cells were capable of responding to Shigella antigen in vitro. Absence of specific PFC in cell cultures from tolerant animals supports the concept that tolerance is due to a central failure of specific immunocompetent cells and not due to an inhibitory effect caused by either “excess” antigen or humoral antibody.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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