Characteristics of early murine B-lymphocyte precursors and their direct sensitivity to negative regulators.

Blood
Taku KouroPaul W Kincade

Abstract

Recently, a collection of surface markers was exploited to isolate viable Lin(-) TdT(+) cells from murine bone marrow. These early pro-B cells were enriched for B-lineage lymphocyte precursor activity measured by short-term culture and had little responsiveness to myeloid growth factors. Early precursors can be propagated with remarkably high cloning frequencies in stromal cell-free, serum-free cultures, permitting this analysis of direct regulatory factors. Expression of the interleukin-7 receptor (IL-7Ralpha) chain marks functional precursors and IL-7 is necessary for progression beyond the CD45RA(+) CD19(-) stage. Efficient survival and differentiation were only observed when stem cell factor and Flt-3 ligand were also present. IL-7-responsive CD19(+) precursors are estrogen resistant. However, B-lineage differentiation was selectively abrogated when highly purified Lin(-) precursors were treated with hormone in the absence of stromal cells. In addition, early stages of B lymphopoiesis were arrested by limitin, a new interferon (IFN)-like cytokine as well as IFN-alpha, IFN-gamma, or transforming growth factor beta (TGF-beta), but not by epidermal growth factor (EGF). Lin(-) TdT(+) early pro-B cells are shown here to be CD27(...Continue Reading

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