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The Journal of Immunology, Vol 142, Issue 1 161-166, Copyright © 1989 by American Association of Immunologists
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D Rennick, J Jackson, C Moulds, F Lee and G Yang
Department of Immunology, DNAX Research Institute, Palo Alto, CA 94304.
The addition of IL-3 to modified Whitlock-Witte long-term lymphocyte cultures was found to enhance the growth of a small but significant number of B cell precursors supported by an adherent stromal cell monolayer. Several pre-B cell lines were cloned from IL-3-treated long- term lymphocyte cultures. The growth requirements and physical properties of one representative clone, BL/3, are described. BL/3 cells were shown to be unresponsive to IL-3 except when it is used at very high concentrations. In contrast, significant growth was stimulated by stromal cell conditioned medium previously shown to contain a pre-B cell growth factor. Optimal growth of the pre-B cell clone was stimulated by stromal cell conditioned medium plus IL-3. Synergy between the stromal cell-derived factor and IL-3 occurred when IL-3 was used over a wide range of concentrations including a relatively low amount that was ineffective as a growth stimulus by itself. The finding that more than one factor is required to sustain optimal growth of some pre-B cells parallels the complex growth requirements reported for some primitive myeloid/erythroid progenitors.
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