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Novel B219/OB receptor isoforms: Possible role of leptin in hematopoiesis and reproduction

Nature Medicine volume 2, pages 585–589 (1996)Cite this article

Abstract

Hematopoietic development is a complex process that involves a large number of growth factors and cytokines. Many cytokines are known to act on more mature, lineage–restricted cells of the hematopoietic system1,2. However, no specific factors have yet been identified that induce the expansion of the most primitive hematopoietic cells without also inducing differentiation. To search for such factors, we isolated novel cell lines from the yolk sac in order to identify genes important in early hematopoietic and endothelial development. This approach led to the discovery of B219, a sequence that is expressed in at least four isoforms in very primitive hematopoietic cell populations and which may represent a novel hemopoietin receptor. The recently published receptor3 for the obesity (ob) gene product (leptin)4 is an isoform of B219 with a nearly identical ligand binding domain. B219/obr is expressed in the yolk sac, early fetal liver, enriched hematopoietic stem cells and in a variety of lymphohematopoietic cell lines. B2T9/obr is also expressed at high levels in adult reproductive organs. B219/obr maps to human chromosome 1p32, a region syntenic with the recently reported location of obr on murine chromosome 4 (ref. 5).

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Authors and Affiliations

  1. Progenitor, Inc., 1507 Chambers Rd, Columbus, Ohio, 43212, USA

    Joseph A. Cioffi, Alan W. Shafer, Thomas J. Zupancic, Julie Smith-Gbur, Adel Mikhail, Doros Platika & H. Ralph Snodgrass

  2. Department of Internal Medicine, Division of Bone Marrow Transplantation, Ohio State University Medical School, Columbus, Ohio, 43210, USA

    H. Ralph Snodgrass

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  1. Joseph A. Cioffi
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  2. Alan W. Shafer
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Correspondence to H. Ralph Snodgrass.

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Cioffi, J., Shafer, A., Zupancic, T. et al. Novel B219/OB receptor isoforms: Possible role of leptin in hematopoiesis and reproduction. Nat Med 2, 585–589 (1996). https://doi.org/10.1038/nm0596-585

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