Differential in vitro maturation of hematopoietic stem cells from wild-type and immunoglobulin transgenic mice.
During B-cell lymphopoiesis, hematopoietic stem cells commit to the B-cell lineage as monitored by the expression of phenotypic cell surface antigens and the production of immunoglobulin chains. Two cytokines, interleukin-7 (IL-7) and Flt-3 ligand (FL), appear to act in conjunction to drive this development process. Using an in vitro, stroma-free culture system and these cytokines, the commitment of murine Sca+ Lin- bone marrow cells to the B-cell lineage was examined with stem cells from immunoglobulin (Ig) transgenic and wild-type mice. After 12 days of culture in IL-7 and FL, stem cells from wild-type animals had matured to express surface B220, CD19, CD43, BP-1 and heat-stable antigen (HSA). These cells lacked detectable intracellular mu chains while exhibiting partial D-J rearrangement. In contrast, Sca+Lin- cells from Ig transgenic mice that were cultured similarly expressed B220, CD19, IgD, intracellular and surface mu, HSA but not CD43 or BP-1. These results suggest that expression of the Ig transgene during in vitro development overcame a block in B-cell lymphopoiesis and recapitulated in vivo events. Thus, IL-7 and FL treatment allowed uncommitted stem cells to progress to the early pre-B-cell stage while similarly treated Ig transgenic cells progressed completely to the mature B-cell stage.
Jayne
J A
JA
Department of Microbiology/Immunology, Indiana University School of Medicine, Indianapolis, USA.
Reid
S
S
Braun
S E
SE
Broxmeyer
H E
HE
D000818:Animals; D002455:Cell Division; D002460:Cell Line; D005260:Female; D015322:Gene Rearrangement, B-Lymphocyte; D006412:Hematopoietic Stem Cells / Q000166:cytology*; D007136:Immunoglobulins / Q000235:genetics*; D015851:Interleukin-7 / Q000494:pharmacology / Q000502:physiology; D008565:Membrane Proteins / Q000494:pharmacology / Q000502:physiology; D051379:Mice; D008810:Mice, Inbred C57BL; D008822:Mice, Transgenic; D016133:Polymerase Chain Reaction
D007136:Immunoglobulins; D015851:Interleukin-7; D008565:Membrane Proteins; C084881:flt3 ligand protein