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Blood, Vol. 94 No. 8 (October 15), 1999:
pp. 2595-2604
Symmetry of Initial Cell Divisions Among Primitive Hematopoietic
Progenitors Is Independent of Ontogenic Age and Regulatory
Molecules
Shiang Huang,
Ping Law,
Karl Francis,
Bernhard O. Palsson, and
Anthony D. Ho
From the Departments of Medicine and Bioengineering, University of
California, San Diego, CA; and the Department of Medicine V, University
of Heidelberg, Heidelberg, Germany.
We have developed a time-lapse camera system to follow the
replication history and the fate of hematopoietic stem cells (HSC) at a
single-cell level. Combined with single-cell culture, we correlated the
early replication behavior with colony development after 14 days. The
membrane dye PKH26 was used to monitor cell division. In addition to
multiple, synchronous, and symmetric divisions, single-sorted
CD34+/CD38 cells derived from fetal liver
(FLV) also gave rise to a daughter cell that remained quiescent for up
to 8 days, whereas the other daughter cell proliferated exponentially.
Upon separation and replating as single cells onto medium containing a
cytokine cocktail, 60.6% ± 9.8% of the initially quiescent cells
(PKH26 bright) gave rise again to colonies and 15.8% ± 7.8% to
blast colonies that could be replated. We have then determined the
effects of various regulatory molecules on symmetry of initial cell
divisions. After single-cell sorting, the
CD34+/CD38 cells derived from FLV were
exposed to flt3-ligand, thrombopoietin, stem cell factor (SCF), or
medium containing a cytokine cocktail (with SCF, interleukin-3,
interleukin-6, granulocyte-macrophage colony-stimulating factor, and
erythropoietin). Whereas mitotic rate, colony efficiency, and
asymmetric divisions could be altered using various regulatory
molecules, the asymmetric division index, defined as the number of
asymmetric divisions versus the number of dividing cells, was not
altered significantly. This observation suggests that, although lineage
commitment and cell proliferation can be skewed by extrinsic signaling,
symmetry of early divisions is probably under the control of intrinsic factors.

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