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- W1990318739 abstract "Summary Mechanisms responsible for the induction of anti-nuclear autoantibodies (ANA) following exposure of the immune system to an excess of apoptotic cells are incompletely understood. In this study, the immunogenicity of late apoptotic cells expressing heterologous or syngeneic forms of La/SS-B was investigated following subcutaneous administration to A/J mice, a non-autoimmune strain in which the La antigenic system is well understood. Immunization of A/J mice with late apoptotic thymocytes taken from mice transgenic (Tg) for the human La (hLa) nuclear antigen resulted in the production of IgG ANA specific for human and mouse forms of La in the absence of foreign adjuvants. Preparations of phenotypically healthy cells expressing heterologous hLa were also immunogenic. However, hLa Tg late apoptotic cells accelerated and enhanced the apparent heterologous healthy cell-induced anti-La humoral response, while non-Tg late apoptotic cells did not. Subcutaneous administration of late apoptotic cells was insufficient to break existing tolerance to the hLa antigen in hLa Tg mice or to the endogenous mouse La (mLa) antigen in A/J mice immunized with syngeneic thymocytes, indicating a requirement for the presence of heterologous epitopes for anti-La ANA production. Lymph node dendritic cells (DC) but not B cells isolated from non-Tg mice injected with hLa Tg late apoptotic cells presented immunodominant T helper cell epitopes of hLa. These studies support a model in which the generation of neo-T cell epitopes is required for loss of tolerance to nuclear proteins after exposure of the healthy immune system to an excess of cells in late stages of apoptosis." @default.
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- W1990318739 date "2005-12-20" @default.
- W1990318739 modified "2023-10-16" @default.
- W1990318739 title "Neo-epitopes are required for immunogenicity of the La/SS-B nuclear antigen in the context of late apoptotic cells" @default.
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- W1990318739 doi "https://doi.org/10.1111/j.1365-2249.2005.03001.x" @default.
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