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From the * I. Department of Medicine, Section of Pathophysiology; Soluble cytokine receptors modulate the activity of their cognate ligands. Interleukin (IL)-6 in
association with the soluble IL-6 receptor (sIL-6R) can activate cells expressing the gp130 signal transducer lacking the specific IL-6R. To investigate the function of the IL-6-sIL-6R complex in vivo and to discriminate the function of the IL-6-sIL-6R complex from the function of
IL-6 alone, we have established a transgenic mouse model. Double-transgenic mice coexpressing IL-6 and sIL-6R were generated and compared with IL-6 and sIL-6R single-transgenic
mice. The main phenotype found in IL-6-sIL-6R mice was a dramatic increase of extramedullary hematopoietic progenitor cells in liver and spleen but not in the bone marrow. In IL-6 single-transgenic mice and sIL-6R single-transgenic mice no such effects were observed. The
high numbers of hematopoietic progenitor cells were reflected by a strong increase of peripheral blood cell numbers. Therefore, activators of the gp130 signal transducer like the IL-6-IL-6R
complex may represent most powerful stimulators for extramedullary hematopoietic progenitor
cells. gp130 activators may become important for the expansion of hematopoietic progenitor
cells in vivo and in vitro.
Institute of Pathology; § III. Department of Medicine, University of Mainz, D-55101 Mainz, Germany;
Instituto di
Ricerche di Biologia Moleculare P. Angeletti, Pomezia, Rome, Italy; and ¶ Institute of Pathology,
University of Cologne, 51123 Cologne, Germany
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