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The Journal of Immunology, 2004, 172: 625-635.
Copyright © 2004 by The American Association of Immunologists

Impaired Clearance of Apoptotic Cells Induces the Activation of Autoreactive Anti-Sm Marginal Zone and B-1 B Cells 1

Ye Qian2, Hongsheng Wang and Stephen H. Clarke

Department of Microbiology and Immunology, University of North Carolina, Chapel Hill, NC 27599

Since apoptotic cell Ags are thought to be a source of self-Ag in systemic lupus erythematosus, we have examined the role of apoptotic cells in the regulation and activation of B cells specific for Sm, a ribonucleoprotein targeted in human and murine lupus. Using Ig-transgenic mice that have a high frequency of anti-Sm B cells, we find that apoptotic cell injection induces a transient splenic B cell response, while simultaneously causing extensive splenic and peritoneal anti-Sm B cell death. In contrast, mice deficient in the clearance of apoptotic cells develop a chronic anti-Sm response beginning at 1–2 mo of age. These mice have expanded marginal zone and B-1 B cell populations and anti-Sm B cells of both types are activated to form Ab-secreting cells. This activation appears to be Ag-specific, suggesting that activation is due to increased availability of apoptotic cell Ags. Since marginal zone and B-1 cells are positively selected, these data suggest a loss of ignorance rather than a loss of tolerance.




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