Immunoglobulin-specific T-B cell interaction. III. B cell activation by immunoglobulin-recognizing T cell clones

European Journal of Immunology
S M MazelV L Yurin

Abstract

Immunoglobulin (Ig)-specific T-B cell interactions were studied in the model of T cell recognition of Ig kappa chain Ig kappa-1b allotype in Ig kappa-1-congenic rats. Using Ig kappa-1b-recognizing major histocompatibility complex (MHC)-restricted T helper clones from August rats we have shown that Ig kappa-1b+ B cells from congenic August.1b rats presented Ig kappa-1b epitope of the processed self-synthesized Ig to T clones. This interaction was found to be a bidirectional regulatory event inducing specific MHC-dependent proliferation of both interacting T cell and B cell as well as Ig(Ig kappa-1b) synthesis. Small Ig kappa-1b+ B cells were capable of inducing T clone proliferation and becoming activated in response to the same T clone. Limiting dilution analysis suggested that every tenth cell in Ig kappa-1b+ B cell population is involved in this interaction. The bystander activation of Ig kappa-1a+ B cells by T clones in the presence of irradiated Ig kappa-1b+ spleen cells, if observed, was less than the level of specific Ig kappa-1b+ B cell proliferation. In contrast to a 20-fold increase of Ig(Ig kappa-1b) levels upon stimulation of Ig kappa-1b+/1a+ B cell population from heterozygous (August x August.1b)F1 rats by T clones...Continue Reading

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