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The Journal of Immunology, Vol 156, Issue 2 489-496, Copyright © 1996 by American Association of Immunologists

ARTICLES

flk2/flt3 ligand is a potent cofactor for the growth of primitive B cell progenitors

BE Hunte, S Hudak, D Campbell, Y Xu and D Rennick
Department of Immunology, DNAX Research Institute of Molecular and Cellular Biology, Palo Alto, CA 94304, USA.

We have investigated the role of flk2/flt3 ligand (FL) in B cell lymphopoiesis. The ability of FL to stimulate the growth of immature B cells was assessed using distinct populations: CD43lowB220+ pre-B cells, CD43+B220+ pro-B cells, and CD43+B220low progenitors. FL failed to affect the growth of the pro-B or pre-B cells whether used alone or in combination with stem cell factor (SCF) or IL-7. In striking contrast, FL was a potent cofactor for the CD43+B220low progenitor cells, interacting with either IL-7 and/or SCF to stimulate their growth. The combination of FL with IL-7 plus SCF stimulated maximum expansion of these cells, albeit, less than that stimulated in stromal cell cultures. When the CD43+B220low progenitors were divided based on expression of heat stable Ag (CD24) into a CD24- and a CD24+ subset, the FL-responsive cells were contained only within the CD24- subset. FL interacted with SCF or with IL-7 to stimulate their growth resulting in a 20- and 50-fold increase in cellularity, respectively. Since the CD24- subset was the most immature of the B cell populations studied, our data suggest that FL costimulates the expansion of very primitive B cell progenitors.


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