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J. Virol., Dec 1995, 7541-7547, Vol 69, No. 12
C Baum, S Hegewisch-Becker, HG Eckert, C Stocking and W Ostertag
We present data that retroviral gene expression in early hematopoietic
cells is subjected to transcriptional controls similar to those previously
described for embryonic stem cells. Transient transfection experiments
revealed that both the viral enhancer region in the U3 region of the long
terminal repeat as well as a repressor element coincident with the primer
binding site of Moloney leukemia viruses are limiting for expression in
hematopoietic cells in a differentiation- dependent manner. Within the
group of Moloney leukemia virus-related viruses, only the
myeloproliferative sarcoma virus showed high enhancer activity in myeloid
(including erythroid) cells. In contrast, enhancer regions related to the
Friend mink cell focus-forming viruses mediate much higher gene expression
levels in both multipotent and lineage- committed myeloid cells. In
addition, transcriptional repression related to sequences in the primer
binding site of Moloney leukemia virus-derived vectors is also found in
early hematopoietic cells and can be overcome by using the corresponding
sequences of the murine embryonic stem cell virus. On the basis of these
results, two types of novel retroviral hybrid vectors were developed; they
combine the U3 regions of either the Friend mink cell focus-forming virus
family or the myeloproliferative sarcoma virus with the primer binding site
of the murine embryonic stem cell virus. When used to express the human
multiple drug resistance gene, these vectors substantially improve
protection to cytostatic drugs in transduced hematopoietic cell lines
FDC-Pmix, TF-1, and K-562 in comparison with Moloney leukemia virus-
derived vectors presently used for the stem cell protection approach in
somatic gene therapy.
Copyright © 1995, American Society for Microbiology
Novel retroviral vectors for efficient expression of the multidrug resistance (mdr-1) gene in early hematopoietic cells
Abteilung Zell-und Virusgenetik, Heinrich-Pette-Institut fur Experimentelle Virologie und Immunologie, Universitat Hamburg, Germany.
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