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Blood, Vol. 94 No. 11 (December 1), 1999: pp. 3722-3729

Differentiation Stage-Specific Regulation of Primitive Human Hematopoietic Progenitor Cycling by Exogenous and Endogenous Inhibitors in an In Vivo Model

J.D. Cashman, I. Clark-Lewis, A.C. Eaves, and C.J. Eaves

From the Terry Fox Laboratory, British Columbia Cancer Agency, Biomedical Research Centre; and Departments of Medical Genetics, Biochemistry and Molecular Biology, Medicine, and Pathology and Laboratory Medicine, University of British Columbia, Vancouver, British Columbia, Canada.

Nonobese diabetic/severe combined immunodeficient (NOD/SCID) mice transplanted with human cord blood or adult marrow cells and injected 6 weeks posttransplant with 2 daily doses of transforming growth factor-beta 1 (TGF-beta 1), monocyte chemoattractant protein-1 (MCP-1), or a nonaggregating form of macrophage inflammatory protein-1alpha (MIP-1alpha ) showed unique patterns of inhibition of human progenitor proliferation 1 day later. TGF-beta 1 was active on long-term culture initiating cells (LTC-IC) and on primitive erythroid and granulopoietic colony-forming cells (HPP-CFC), but had no effect on mature CFC. MCP-1 inhibited the cycling of both types of HPP-CFC but not LTC-IC. MIP-1alpha did not inhibit either LTC-IC or granulopoietic HPP-CFC but was active on erythroid HPP-CFC and mature granulopoietic CFC. All of these responses were independent of the source of human cells transplanted. LTC-IC of either human cord blood or adult marrow origin continue to proliferate in NOD/SCID mice for many weeks, although the turnover of all types of human CFC in mice transplanted with adult human marrow (but not cord blood) is downregulated after 6 weeks. Interestingly, administration of either MIP-1beta , an antagonist of both MIP-1alpha and MCP-1 or MCP-1(9-76), an antagonist of MCP-1 (and MCP-2 and MCP-3), into mice in which human marrow-derived CFC had become quiescent, caused the rapid reactivation of these progenitors in vivo. These results provide the first definition of stage-specific inhibitors of human hematopoietic progenitor cell cycling in vivo. In addition they show that endogenous chemokines can contribute to late graft failure, which can be reversed by the administration of specific antagonists.


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