Interleukin-7 contributes to human pro-B-cell development in a mouse stromal cell-dependent culture system

Tomoko Taguchi, Hisami Takenouchi, Yusuke Shiozawa, Jun Matsui, Noriko Kitamura, Yoshitaka Miyagawa, Yoko U. Katagiri, Takao Takahashi, Hajime Okita, Junichiro Fujimoto, Nobutaka Kiyokawa

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


Objective: The role of interleukin (IL)-7 in human B lymphopoiesis is still controversial. We used an in vitro culture system to verify involvement of IL-7 in development of human pro-B cells from hematopoietic stem cells. Materials and Methods: Human CD34+ bone marrow cells were cultured for 4 weeks on MS-5 mouse stromal cells to induce pro-B cells. Expression of IL-7 receptor α or other B-cell differentiation marker genes on cultured human CD34+bone marrow cells was investigated by reverse transcription polymerase chain reaction (RT-PCR). Colony assay of human CD34+ bone marrow cells was also performed to determine the effect of IL-7 on colony-forming ability. Neutralizing antibody or reagent that eliminates the effect of IL-7 was added to the culture system, and the number of pro-B cells induced was estimated by flow cytometry. Results: RT-PCR analysis revealed mRNA expression of IL-7 receptor α as well as B-cell differentiation marker genes in not only CD19+ pro-B cells but also CD19- CD33- cells induced from CD34+ bone marrow cells after cultivation for 4 weeks on MS-5 cells. Addition of anti-mouse IL-7 antibody, anti-human IL-7 receptor α antibody, or JAK3 kinase inhibitor reduced the number of pro-B cells induced, demonstrating that elimination of IL-7 reduces pro-B-cell development. Addition of anti-mouse IL-7 antibody emphasized the colony-forming ability of burst-forming unit erythroid cells. Conclusions: IL-7 produced by MS-5 cells is required for human pro-B-cell development from CD34+bone marrow cells in our culture system, and IL-7 appears to play a certain role in early human B lymphopoiesis.

Original languageEnglish
Pages (from-to)1398-1407
Number of pages10
JournalExperimental Hematology
Issue number9
Publication statusPublished - 2007 Sept

ASJC Scopus subject areas

  • Molecular Biology
  • Hematology
  • Genetics
  • Cell Biology
  • Cancer Research


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