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The FLK2/FLT3 ligand synergizes with interleukin-7 in promoting stromal-
cell-independent expansion and differentiation of human fetal pro-B cells
in vitro
R Namikawa, MO Muench, JE de Vries and MG Roncarolo
Human Immunology Department, DNAX Research Institute of Molecular and
Cellular Biology, Inc, Palo Alto, CA, USA.
The effects of a novel cytokine FLK2/FLT3 ligand (FL) on human fetal bone
marrow-derived CD34+CD19+ pro-B cells were analyzed in a stromal-
cell-independent, serum-deprived culture system. FL, like interleukin-3
(IL-3), synergized with IL-7 in promoting pro-B cell growth, and
differentiation of these cells into CD34-CD19+clgM+slgM- pre-B cells,
whereas a small proportion of these cells even differentiate into more
mature slgM+ B cells. In contrast, KIT ligand (KL) and granulocyte-
macrophage colony-stimulating factor (GM-CSF) were ineffective in promoting
IL-7-dependent pro-B cell growth and differentiation. Maximal levels of
pro-B cell expansion, generally resulting in 15- to 30-fold increases in
cellularity, were obtained in cultures supplemented with optimal doses of
FL + IL-7 + IL-3. The addition of mouse bone marrow stromal cells further
enhanced the proliferation and differentiation of pro-B cells obtained in
the presence of these three cytokines. Under these conditions, cultures
could be maintained for more than 4 weeks, and in general 40- to 50-fold
increases in cell numbers were observed by 3 weeks of culture. The
percentages of clgM+ and slgM+ B cells increased 1.5- to 3-fold and 2-fold,
respectively, suggesting that stromal cells may provide additional
costimulatory signals for human B- cell growth and differentiation that are
different from IL-7, IL-3, and FL. Collectively, our results indicate that
FL, in contrast to KL, strongly promotes long-term expansion and
differentiation of human pro- B cells in the presence of IL-7 or in
combination of IL-7 and IL-3, which is a novel property of this
hematopoietic growth factor.
Volume 87,
Issue 5,
pp. 1881-1890,
03/01/1996
Copyright © 1996 by The American Society of Hematology

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