Linked Life Data

9472780

Source:http://linkedlifedata.com/resource/pubmed/id/9472780

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pubmed-article:9472780pubmed:abstractTextA novel retroviral vector has been designed based on a Friend-murine leukemia virus (Fr-MuLV) FB29 strain. The latter has been selected according to characteristics of pathogenicity in mice where it induces a disease of the haemopoietic system affecting all lineages. Higher infectivity has also been demonstrated as compared to other strains. In accordance with these findings, the amphotropic producer clone used in this study carrying along the neomycine resistance gene (FOCH-Neo), harbors viral titers over 10(7) cfu/ml. To investigate the potential of genetically engineering hematopoietic precursors, CD34+ progenitors were selected from cord blood, bone marrow, and peripheral blood mobilized stem cells (patients + solid tumors) and transduced with FOCH-Neo. High transduction rates were achieved using virus supernatant and minimal doses of hematopoietic growth factors during pretransduction and transduction steps. A polymerase chain reaction (PCR) assay investigating the presence of both neomycin-encoding and viral vector sequences tested positive in 45-90% of granulocyte-macrophage colony-forming units (CFU-GM) generating cells (bone marrow and peripheral blood derived cells) following transduction. An average of 35% colonies showed resistance to G418. Such levels of transduction proved reproducible using only supernatants harboring over 10(7) cfu/ml. In those experiments where long-term in vitro cultures could be maintained over 5 weeks (all cord blood and 5 among 23 PBSC), efficient transduction of long-term culture initiating cell (LTC-IC) hematopoietic progenitors was demonstrated on the basis of both resistance to G418 and virus integration. In the latter case, the PCR assay tested positive in as much as 35-60% of late unselected CFU-colonies. This novel retroviral vector harbors interesting features toward genetic modification of hematopoietic progenitors.lld:pubmed
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pubmed-article:9472780pubmed:pagination207-16lld:pubmed
pubmed-article:9472780pubmed:dateRevised2006-11-15lld:pubmed
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pubmed-article:9472780pubmed:articleTitleEfficient transduction of hemopoietic CD34+ progenitors of human origin using an original retroviral vector derived from Fr-MuLV-FB29: in vitro assessment.lld:pubmed
pubmed-article:9472780pubmed:affiliationDépartement d'Oncologie Médicale, Hôpital Saint-Louis, Institut d'Hématologie, Paris, France.lld:pubmed
pubmed-article:9472780pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:9472780pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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