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Stem Cells, Vol. 17, No. 3, 162-171, May 1999
© 1999 AlphaMed Press

The Notch/Jagged Pathway Inhibits Proliferation of Human Hematopoietic Progenitors In Vitro

Liberty Walkera,*, Maureen Lyncha,*, Sheryl Silvermana, John Frasera, Jim Boulterb, Gerry Weinmasterc, Judith C. Gassona,c

a Division of Hematology-Oncology, Department of Medicine, UCLA School of Medicine and Jonsson Comprehensive Cancer Center, Los Angeles, California, USA;
b Department of Psychiatry and Biobehavioral Science, UCLA Neuropsychiatric Institute, Los Angeles, California, USA;
c Department of Biological Chemistry, Molecular Biology Institute, UCLA School of Medicine, Los Angeles, California, USA.

Key Words. Jagged1 • Notch • Hematopoiesis • Stem cell factor • CD34+ cells

Dr. Judith C. Gasson, Jonsson Comprehensive Cancer Center, 8-684 Factor, Box 951781, UCLA, Los Angeles, California 90095-1781, USA.

The cell surface receptor Notch1 is expressed on CD34+ hematopoietic precursors, whereas one of its ligands, Jagged1, is expressed on bone marrow stromal cells. To examine the role of Notch signaling in early hematopoiesis, human CD34+ cells were cultured in the presence or absence of exogenous cytokines on feeder layers that either did or did not express Jagged1. In the absence of recombinant growth factors, Jagged1 decreased myeloid colony formation by CD34+ cells, as well as 3H-thymidine incorporation and entry into S phase. In the presence of a strong cytokine signal to proliferate and mature, (interleukin 3 [IL-3] and IL-6, stem cell factor [SCF], and G-CSF), Jagged1 did not significantly alter either the fold expansion or the types of colonies formed by CD34+ cells. However, in the presence of SCF alone, Jagged1 increased erythroid colony formation twofold. These results demonstrate that Notch can modulate a growth factor signal, and that in the absence of growth factor stimulation, the Jagged1-Notch pathway preserves CD34+ cells in an immature state.




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