Differential in vitro maturation of hematopoietic stem cells from wild-type and immunoglobulin transgenic mice

Jennifer A. Jayne, Suzanna Reid, Stephen E. Braun, Hal E. Broxmeyer

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

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 μ 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 μ, 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.

Original languageEnglish (US)
Pages (from-to)195-204
Number of pages10
JournalCytokines, Cellular and Molecular Therapy
Volume5
Issue number4
StatePublished - Dec 1 1999

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Keywords

  • B lymphocyte
  • FL
  • Immunoglobulin rearrangement
  • Interleukin-7
  • Lineage commitment

ASJC Scopus subject areas

  • Pharmacology
  • Immunology and Allergy
  • Immunology

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