PMID: 7524619May 1, 1994Paper

Ex vivo expansion and selection of retrovirally transduced bone marrow: an efficient methodology for gene-transfer to murine lympho-haemopoietic stem cells

British Journal of Haematology
A BernadJ A Bueren

Abstract

An efficient procedure for the insertion of genetic markers into a large proportion of the mouse haemopoietic system was developed, based on the in vitro expansion of retrovirally infected bone marrow and selection of the transduced cells. Bone marrow cells harvested 4 d after 5-FU treatment were incubated under IL-3/SCF stimulation and their growth dynamic, susceptibility to retroviral infection and reconstitution capacity evaluated throughout the incubation period. On the third day of culture a maximum expansion in the CFU-GM and CFU-S12 progenitor pools was observed (130- and 15-fold, respectively), with no apparent impairment in long-term repopulating precursors. This expansion was, however, accompanied by a net decrease in the CFU-GM susceptibility to the infection by supernatants containing a Moloney-derived ecotropic retroviral vector carrying the neor gene. The designed protocol thus involved the infection of freshly harvested 5-FU-treated bone marrow, followed by expansion under IL-3/SCF stimulation and selection for resistance to G418. This procedure allowed us to harvest up to 780 CFU-GM and 50 CFU-S12 per 10(5) bone marrow cells, free from non-genetically marked progenitors. Most of the animals reconstituted with th...Continue Reading

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