The Journal of Experimental Medicine
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Published online 6 November 2000.
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© The Rockefeller University Press, 0022-1007/2000/11/1365/ $5.00
The Journal of Experimental Medicine, Volume 192, Number 9, November 6, 2000 1365-1372


Brief Definitive Reports

The Notch Ligand Jagged-1 Represents a Novel Growth Factor of Human Hematopoietic Stem Cells

Frances N. Karanua, Barbara Murdocha, Lisa Gallachera, Dongmei M. Wua, Masahide Koremotob, Seiji Sakanob, and Mickie Bhatiaa
a From The John P. Robarts Research Institute, Developmental Stem Cell Biology, and the Department of Microbiology and Immunology, The University of Western Ontario, London, Ontario, Canada N6A 5K8
b The Second Research Department, Central Technology Laboratory, Asahi Chemical Industry Company, Limited, Shizuoka 416, Japan

Correspondence to: Mickie Bhatia, The John P. Robarts Research Institute, Developmental Stem Cell Biology, 100 Perth Dr., London, Ontario, Canada N6A 5K8. Tel:519-663-5777 Ext. 34166 Fax:519-663-3789

The Notch ligand, Jagged-1, plays an essential role in tissue formation during embryonic development of primitive organisms. However, little is known regarding the role of Jagged-1 in the regulation of tissue-specific stem cells or its function in humans. Here, we show that uncommitted human hematopoietic cells and cells that comprise the putative blood stem cell microenvironment express Jagged-1 and the Notch receptors. Addition of a soluble form of human Jagged-1 to cultures of purified primitive human blood cells had modest effects in augmenting cytokine-induced proliferation of progenitors. However, intravenous transplantation of cultured cells into immunodeficient mice revealed that human (h)Jagged-1 induces the survival and expansion of human stem cells capable of pluripotent repopulating capacity. Our findings demonstrate that hJagged-1 represents a novel growth factor of human stem cells, thereby providing an opportunity for the clinical utility of Notch ligands in the expansion of primitive cells capable of hematopoietic reconstitution.

Key Words: hematopoiesis, Jagged-1, Notch, stem cells, development


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