Negative regulation of early B lymphopoiesis by interleukin 3 and interleukin 1 alpha.
We recently developed a two-step methyl cellulose culture system for murine lymphohemopoietic progenitors that are capable of differentiation along the myeloid and B-lymphoid lineages. In this system, two-factor combinations, which include steel factor plus interleukin (IL) 6, IL-11, or granulocyte colony-stimulating factor effectively supported the lymphomyeloid potential of primary colonies. Interestingly, IL-3 could neither replace nor act synergistically with steel factor in maintaining the B-lymphoid potential of the primary colonies although the frequency of colony formation was the same with IL-3 and steel factor. We now report that addition of IL-3 or IL-1 alpha to a permissive system suppresses the B-lymphoid potential of primitive progenitor cells in primary culture in dose-dependent fashion. In vivo transfer of the primary colonies to scid mice confirmed the suppressive effects of IL-3 and IL-1 alpha. In addition, IL-1 alpha inhibited pre-B-cell colony formation in the secondary culture. Once pre-B-cell colonies had formed in secondary culture, neither factor affected the proliferation of the pre-B cells. These results suggest negative regulatory roles for IL-3 and IL-1 alpha in early stages of B lymphopoiesis.
Hirayama
F
F
Department of Medicine, Medical University of South Carolina, Charleston.
Clark
S C
SC
Ogawa
M
M
D000818:Animals; D001402:B-Lymphocytes / Q000166:cytology / Q000187:drug effects*; D002455:Cell Division / Q000187:drug effects; D002478:Cells, Cultured; D016207:Cytokines / Q000494:pharmacology; D006410:Hematopoiesis / Q000187:drug effects*; D016298:Hematopoietic Cell Growth Factors / Q000494:pharmacology; D006412:Hematopoietic Stem Cells / Q000166:cytology / Q000187:drug effects; D066298:In Vitro Techniques; D007375:Interleukin-1 / Q000494:pharmacology*; D007377:Interleukin-3 / Q000494:pharmacology*; D007700:Kinetics; D051379:Mice; D016513:Mice, SCID; D019089:Stem Cell Factor
D016207:Cytokines; D016298:Hematopoietic Cell Growth Factors; D007375:Interleukin-1; D007377:Interleukin-3; D019089:Stem Cell Factor