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Gene transfer into normal human hematopoietic cells using in vitro and in
vivo assays
JE Dick, S Kamel-Reid, B Murdoch and M Doedens
Department of Genetics, Hospital for Sick Children, Toronto, Ontario,
Canada.
The ability to transfer new genetic material into human hematopoietic cells
provides the foundation for characterizing the organization and
developmental program of human hematopoietic stem cells. It also provides a
valuable model in which to test gene transfer and long-term expression in
human hematopoietic cells as a prelude to human gene therapy. At the
present time such studies are limited by the absence of in vivo assays for
human stem cells, although recent descriptions of the engraftment of human
hematopoietic cells in immune-deficient mice may provide the basis for such
an assay. This study focuses on the establishment of conditions required
for high efficiency retrovirus- mediated gene transfer into human
hematopoietic progenitors that can be assayed in vitro in short-term colony
assays and in vivo in immune- deficient mice. Here we report that a 24-hour
preincubation of human bone marrow in 5637-conditioned medium, before
infection, increases gene transfer efficiency into in vitro colony-forming
cells by sixfold; interleukin-6 (IL-6) and leukemia inhibitory factor (LIF)
provide the same magnitude increase as 5637-conditioned medium. In
contrast, incubation in recombinant growth factors IL-1, IL-3, and
granulocyte- macrophage colony-stimulating factor increases gene transfer
efficiency by 1.5- to 3-fold. Furthermore, preselection in high
concentrations of G418 results in a population of cells significantly
enriched for G418- resistant progenitors (up to 100%). These results,
obtained using detailed survival curves based on colony formation in G418,
have been substantiated by directly detecting the neo gene in individual
colonies using the polymerase chain reaction. Using these optimized
protocols, human bone marrow cells were genetically manipulated with a neo
retrovirus vector and transplanted into immune-deficient bg/nu/xid mice. At
1 month and 4 months after the transplant, the hematopoietic tissues of
these animals remained engrafted with genetically manipulated human cells.
More importantly, G418-resistant progenitors that contained the neo gene
were recovered from the bone marrow and spleen of engrafted animals after 4
months. These experiments establish the feasibility of characterizing human
stem cells using the unique retrovirus integration site as a clonal marker,
similar to techniques developed to elucidate the murine stem cell
hierarchy.
Volume 78,
Issue 3,
pp. 624-634,
08/01/1991
Copyright © 1991 by The American Society of Hematology

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