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Blood, 15 January 2002, Vol. 99, No. 2, pp. 507-512
HEMATOPOIESIS
The ABCG2 transporter is an efficient Hoechst 33342 efflux pump and is preferentially expressed by immature human
hematopoietic progenitors
Christian W. Scharenberg,
Michael A. Harkey, and
Beverly Torok-Storb
From the Divisions of Clinical Research and Basic
Sciences, Fred Hutchinson Cancer Research Center (FHCRC), Seattle, WA.
A promising and increasingly exploited property of hematopoietic
stem cells is their ability to efflux the fluorescent dye Hoechst
33342. The Hoechst-negative cells are isolated by
fluorescence-activated cell sorting as a so-called side
"population" (SP) of bone marrow. This SP from bone marrow, as well
as other tissues, is reported to contain immature stem cells with
considerable plasticity. Some cell lines also efflux Hoechst and
generate SP profiles. Reverse transcription-polymerase chain reaction
(RT-PCR) and efflux inhibition studies with the lung carcinoma cell
line, A549, implicated the ABCG2 transporter as a Hoechst
efflux pump. Furthermore, it is shown that transient expression
of ABCG2 generates a robust SP phenotype in human embryonic
kidney (HEK293) cells. The results allow the conclusion that
ABCG2 is a potent Hoechst efflux pump. Semiquantitative
RT-PCR was used to characterize the developmental pattern of expression
of ABCG2 in hematopoiesis. It is expressed at relatively
high levels in putative hematopoietic stem cells (isolated as SP,
34+/38 or 34+/KDR+
populations) and drops sharply in committed progenitors
(34+/38+, 34+/33+, or
34+/10+). Expression remains low in most
maturing populations, but rises again in natural killer cells and
erythroblasts. Comparison of messenger RNA (mRNA) levels for the 3 major multidrug-resistant efflux pumps, MDR1,
MRP1, and ABCG2, in bone marrow SP cells
reveals that ABCG2 is the predominant form in these cells.
These data suggest that ABCG2 contributes significantly to
the generation of the SP phenotype in hematopoietic stem cells.
Furthermore, the sharp down-regulation of ABCG2 at the
stage of lineage commitment suggests that this gene may play an
important role in the unique physiology of the pluripotent stem cell.

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C. Baum, J. Dullmann, Z. Li, B. Fehse, J. Meyer, D. A. Williams, and C. von Kalle
Side effects of retroviral gene transfer into hematopoietic stem cells
Blood,
March 15, 2003;
101(6):
2099 - 2113.
[Abstract]
[Full Text]
[PDF]
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B. L. Abbott, A.-M. Colapietro, Y. Barnes, F. Marini, M. Andreeff, and B. P. Sorrentino
Low levels of ABCG2 expression in adult AML blast samples
Blood,
December 15, 2002;
100(13):
4594 - 4601.
[Abstract]
[Full Text]
[PDF]
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S. Zhou, J. J. Morris, Y. Barnes, L. Lan, J. D. Schuetz, and B. P. Sorrentino
Bcrp1 gene expression is required for normal numbers of side population stem cells in mice, and confers relative protection to mitoxantrone in hematopoietic cells in vivo
PNAS,
September 17, 2002;
99(19):
12339 - 12344.
[Abstract]
[Full Text]
[PDF]
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D. M. van der Kolk, E. Vellenga, G. L. Scheffer, M. Muller, S. E. Bates, R. J. Scheper, and E. G. E. de Vries
Expression and activity of breast cancer resistance protein (BCRP) in de novo and relapsed acute myeloid leukemia
Blood,
May 15, 2002;
99(10):
3763 - 3770.
[Abstract]
[Full Text]
[PDF]
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J. D. Allen and A. H. Schinkel
Multidrug Resistance and Pharmacological Protection Mediated by the Breast Cancer Resistance Protein (BCRP/ABCG2)
Mol. Cancer Ther.,
April 1, 2002;
1(6):
427 - 434.
[Full Text]
[PDF]
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