Abstract
Hematopoietic stem cells (HSC) are unique in that they give rise both to new stem cells (self-renewal) and to all blood cell types. The cellular and molecular events responsible for the formation of HSC remain unknown mainly because no system exists to study it. Embryonic stem (ES) cells were induced to differentiate by coculture with the stromal cell line RP010 and the combination of interleukin (IL) 3, IL-6, and F (cell-free supernatants from cultures of the FLS4.1 fetal liver stromal cell line). Cell cytometry analysis of the mononuclear cells produced in the cultures was consistent with the presence of PgP-1+ Lin- early hematopoietic (B-220- Mac-1- JORO 75- TER 119-) cells and of fewer B-220+ IgM- B-cell progenitors and JORO 75+ T-lymphocyte progenitors. The cell-sorter-purified PgP-1+ Lin- cells produced by induced ES cells could repopulate the lymphoid, myeloid, and erythroid lineages of irradiated mice. The ES-derived PgP-1+ Lin- cells must possess extensive self-renewal potential, as they were able to produce hematopoietic repopulation of secondary mice recipients. Indeed, marrow cells from irradiated mice reconstituted (15-18 weeks before) with PgP-1+ Lin- cell-sorter-purified cells generated by induced ES cells repopulated the lymphoid, myeloid, and erythroid lineages of secondary mouse recipients assessed 16-20 weeks after their transfer into irradiated secondary mice. The results show that the culture conditions described here support differentiation of ES cells into hematopoietic cells with functional properties of HSC. It should now be possible to unravel the molecular events leading to the formation of HSC.
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