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Cutting Edge |

* Department of Pathology and Laboratory Medicine, University of Pennsylvania School of Medicine, Philadelphia, PA 19104; and
Human Genome Sciences, Inc., Rockville, MD 20850
These studies characterize BLyS responsiveness and receptor expression among transitional and mature peripheral B cells. The results show a maturation-associated increase in BLyS binding capacity that reflects differential expression patterns of the three BLyS receptors. Accordingly, BLyS administration enlarges only late transitional and mature peripheral B (MB) cell compartments. Furthermore, bromodeoxyuridine labeling and cell cycle analyses show these effects are mediated through enhanced proportional survival of cells traversing the T2, T3, and MB cell stages, rather than by causing proliferation or slowing transit within these subsets. Despite similar effects on survival, BLyS up-regulates the antiapoptotic genes A1and bcl-xL in MB cells but not immature B cells. Together, these findings show that, while BLyS influences B cell survival in several peripheral differentiation subsets, the downstream mediators differ, thus providing the first direct evidence for an established B lineage survival system whose intermediates change as B cells mature.
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