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J Exp Med. 2000 Sep 4;192(5):671-80.

Molecular cloning and biological characterization of a novel murine lymphoid growth factor.

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  • 1Department of Molecular Biology, Immunex Corporation, Seattle, Washington 98101, USA. sims@immunex.com


Using a bioassay consisting of the proliferation of a murine B cell line, a cDNA of a gene whose product supports the growth of that cell line was isolated from a thymic stromal cell line. This factor, termed thymic stromal lymphopoietin (TSLP), is a protein of 140 amino acids. The gene encoding TSLP was mapped to murine chromosome 18. Purified recombinant TSLP supported the growth of pre-B cell colonies in vitro, but had no myelopoietic activity. TSLP had comitogenic activity for fetal thymocytes, but was not as potent as interleukin 7 in lobe submersion cultures. Injection of TSLP into neonatal mice induced the expansion of B220(+)BP-1(+) pre-B cells.

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