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Anti-Sm and anti-ssDNA transgenic (Tg) mice were generated using the VH-D-JH rearrangement of an anti-Sm hybridoma of MRL/Mp-lpr/lpr origin. B cells of each specificity account for 15%-35% of the splenic repertoire, but no circulating anti-Sm or anti-ssDNA antibodies are detected. Most autoreactive cells exhibit an immature B cell phenotype and have short half-lives equivalent to those of non-Tg immature B cells. However, at least some anti-Sm B cells are functional, because immunization with murine snRNPs induces anti-Sm secretion. We propose that anti-Sm and anti-ssDNA are eliminated during the transition to mature B cells and that this late stage of tolerance induction is consequential to their spontaneous activation in murine lupus.
Pubmed ID: 9492002
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ZEISS SIGMA VP field emission scanning electron microscope (FE-SEM) for imaging of non-conducting samples. It images of bacteria, cells, plants and organisms. Uses ATLAS software and can be combined with 3View technology from Gatan Inc.
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