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Kimmel Cancer Center and Department of Microbiology and Immunology, Jefferson Medical College, Thomas Jefferson University, Philadelphia, PA 19107
To examine the effect of B cell Ag receptor (BCR) surface density
on B cell development, we studied multiple lines of mice containing
various copy numbers of an IgHµ
transgene. The VH gene
in this transgene encodes multireactive BCRs with low affinity for self
Ags. These BCRs promote differentiation to a B cell subpopulation that
shares some, but not all of the properties of marginal zone (MZ) B
cells. Surface BCR level was found to be related to transgene gene copy
number in these mice. In mice containing 115 copies of the transgene,
elevated surface BCR levels were correlated with increased numbers of B
cells in the MZ-like subset. However, in mice containing 2030 copies
of the transgene, massive clonal deletion of B cells was observed in
the bone marrow, few B cells populated the spleen, and B
cells were essentially absent from the lymph nodes. These data support
the idea that autoantigens mediate not only negative, but positive
selection of developing B cells as well. More importantly, they
illustrate the profound influence of BCR surface density on the extent
to which either of these selective processes take
place.
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