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Nat Biotechnol. 1997 Feb;15(2):142-5.

I. A bioactive designer cytokine for human hematopoietic progenitor cell expansion.

Author information

1
Department of Medicine-Section-Pathophysiology, Mainz University, Germany.

Abstract

Efficient expansion of hematopoietic progenitor cells requires, at least, the simultaneous stimulation of the receptors c-kit and gp130. While c-kit is activated by SCF; gp130, in cells which do not express sufficient amounts of IL-6R, can be activated by the complex of soluble IL-6R (sIL-6R) and IL-6. The therapeutic use of IL-6/sIL-6R, however, has been hampered by the high concentrations of the sIL-6R protein required. We have designed a fusion protein of sIL-6R and IL-6, linked by a flexible peptide chain, that was expressed to high levels. On gp130 expressing cells the fusion protein turned out to be fully active at 100 to 1,000-fold lower concentration than the combination of unlinked IL-6 and IL-6R. The fusion protein was used to effectively expand human hematopoietic progenitor cells ex vivo in a dose dependent fashion.

PMID:
9035138
DOI:
10.1038/nbt0297-142
[Indexed for MEDLINE]
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