Differential effects of interleukin 2 vs B cell growth factor on human B cells.
The effects of recombinant interleukin 2 (IL-2) and high m.w. (HMW) B cell growth factor (BCGF) were examined on normal human peripheral blood B cells activated with Staphylococcus aureus Cowan I (SAC). When SAC-activated B cells were separated into Tac-antigen (Tac-Ag)+ and Tac-Ag- fractions by a cell sorter, recombinant IL-2 induced only the Tac-Ag+ cells to proliferate, whereas both Tac-Ag+ and Tac-Ag- cells responded to HMW-BCGF (m.w. 60,000). Alternatively, SAC-activated B cells were separated according to density into three fractions: low density (large) cells (82 +/- 15% Tac-Ag+), intermediate density (medium) cells (45 +/- 13% Tac-Ag+), and high density (small) cells (less than 5% Tac-Ag+). Recombinant IL-2 enhanced proliferation of low density cells the most, intermediate density cells less, and high density cells not at all. HMW-BCGF induced all three fractions to proliferate to approximately the same degree. Finally, the effects of IL-2 and BCGF on the DNA and RNA content of the various fractions of B cells was examined. RNA content was greater in IL-2-stimulated B cells than BCGF-stimulated B cells, whereas DNA content was the same in both cell populations. IL-2 and BCGF may preferentially interact with different subpopulations of B cells. The interaction of IL-2 or BCGF with normal activated B cells may induce both similar and different intracellular events.
D000328:Adult; D000954:Antigens, Surface / Q000276:immunology; D001402:B-Lymphocytes / Q000145:classification / Q000166:cytology* / Q000276:immunology; D002453:Cell Cycle; D002454:Cell Differentiation; D002455:Cell Division; D004247:DNA / Q000032:analysis; D006801:Humans; D007376:Interleukin-2 / Q000494:pharmacology*; D015847:Interleukin-4; D007378:Interleukins / Q000494:pharmacology*; D007958:Leukocyte Count; D008213:Lymphocyte Activation; D010641:Phenotype; D012313:RNA / Q000032:analysis; D013211:Staphylococcus aureus / Q000276:immunology; D018127:Tumor Necrosis Factor Receptor Superfamily, Member 7
D000954:Antigens, Surface; D007376:Interleukin-2; D007378:Interleukins; D018127:Tumor Necrosis Factor Receptor Superfamily, Member 7; D015847:Interleukin-4; D012313:RNA; D004247:DNA