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The Journal of Immunology, Vol 146, Issue 11 3785-3790, Copyright © 1991 by American Association of Immunologists
ARTICLES |
IK McNiece, KE Langley and KM Zsebo
Amgen Inc., Thousand Oaks, CA 91320.
The cDNA for stem cell factor was recently isolated from Buffalo rat liver cells (BRL-3A) and recombinant rat stem cell factor produced from Escherichia coli (rrSCF164). rrSCF164 synergizes with rhIL-7 to stimulate pre-B clonal growth in agar culture of mouse bone marrow cells, and in this study we have characterized the role of rrSCF164 in B cell development. The combination of rrSCF164 plus rhIL-7 stimulated increased colony numbers compared with the sum of colonies stimulated by rrSCF164 and rhIL-7 alone. Also, increased cell proliferation per colony was stimulated by the combination of rrSCF164 plus rhIL-7 compared with rhIL-7 or rrSCF164 alone. The colonies formed with rrSCF164 plus rhIL-7 and rhIL-7 alone contained exclusively pre-B cells, which expressed B220 Ag and cytoplasmic mu-chain, but were negative for surface Ig expression. Morphological examination of the cells in the colonies showed blast-like characteristics. rrSCF164 alone and in combination with rhIL-7 stimulated generation of B220+ cells in liquid culture of B220- cells, whereas rhIL-7 alone had no stimulatory effect on B220- cells. Both stem cell factor mRNA and bioactivity were detected in a mouse bone marrow-derived stromal cell line, termed OZ- 11. We propose that stem cell factor is a stromal-derived factor that synergizes with IL-7 to stimulate the proliferation and differentiation of pro-B cells to pre-B cells, which become responsive to IL-7 alone.
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