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Molecular and Cellular Biology, September 1998, p. 5247-5255, Vol. 18, No. 9
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Modulated Expression of the Epidermal Growth Factor-Like Homeotic Protein dlk Influences Stromal-Cell-Pre-B-Cell Interactions, Stromal Cell Adipogenesis, and Pre-B-Cell Interleukin-7 Requirements

Steven R. Bauer,1 María José Ruiz-Hidalgo,2 Eva K. Rudikoff,1 Julia Goldstein,2 and Jorge Laborda2,*

Division of Cellular and Gene Therapy1 and Division of Monoclonal Antibodies,2 Office of Therapeutics Research and Review, Center for Biologics Evaluation and Research, Rockville, Maryland 20852

Received 9 December 1997/Returned for modification 27 January 1998/Accepted 22 June 1998

A close relationship exists between adipocyte differentiation of stromal cells and their capacity to support hematopoiesis. The molecular basis for this is unknown. We have studied whether dlk, an epidermal growth factor-like molecule that intervenes in adipogenesis and fetal liver hematopoiesis, affects both stromal cell adipogenesis and B-cell lymphopoiesis in an established pre-B-cell culture system. Pre-B-cell cultures require both soluble interleukin-7 (IL-7) and interactions with stromal cells to promote cell growth and prevent B-cell maturation or apoptosis. We found that BALB/c 3T3 fibroblasts express dlk and function as stromal cells. Transfection of these cells with antisense dlk decreased dlk expression and increased insulin-induced adipocytic differentiation. When antisense transfectants were used as stroma, IL-7 was no longer required to support the growth of pre-B cells and prevent maturation or apoptosis. Antisense dlk transfectants of S10 stromal cells also promoted pre-B-cell growth in the absence of IL-7. These results show that modulation of dlk on stromal cells can influence their adipogenesis and the IL-7 requirements of the pre-B cells growing in contact with them. These results indicate that dlk influences differentiation signals directed both to the stromal cells and to the lymphocyte precursors, suggesting that dlk may play an important role in the bone marrow hematopoietic environment.

* Corresponding author. Mailing address: Division of Monoclonal Antibodies, Office of Therapeutics Research and Review, Center for Biologics Evaluation and Research, 1401 Rockville Pike, Rockville, MD 20852. Phone: (301) 827-0709. Fax: (301) 827-0852. E-mail: laborda{at}helix.nih.gov.

Molecular and Cellular Biology, September 1998, p. 5247-5255, Vol. 18, No. 9
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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