title: High efficiency retroviral-mediated gene transduction into CD34+ cells purified from peripheral blood of breast cancer patients primed with chemotherapy and granulocyte-macrophage colony-stimulating factor.
abstract: The hematopoietic system has been one of the major targets for designing human gene therapy protocols. In the present system, we have transduced LNL6, one of the most commonly used retroviral vectors in gene therapy, into purified CD34+ cells from peripheral blood of patients primed with chemotherapy and granulocyte-macrophage colony-stimulating factor (GM-CSF). Purification of CD34+ cells was achieved by incubation with a murine anti-CD34 monoclonal antibody (9C5), and subsequently with paramagnetic microspheres (Dynal) coated with sheep anti-mouse IgG1 (Fc). The CD34+ cells were released from the beads by treatment with chymopapain. Flow cytometry analysis using the anti-CD34 antibody HPCA-2-FITC targeted at another epitope of CD34 showed that 78-97.5% of the cells thus purified were CD34+. After retroviral-mediated gene transfer, polymerase chain reaction (PCR) analysis revealed that 67-100% of the hematopoietic colonies contained the marker gene neo, indicating that CD34+ cells purified by immunomagnetic microsphere method from peripheral mononuclear cells primed with hematopoietic growth factors are highly susceptible to retroviral-mediated gene transfer. The expression of neo as determined by reverse transcription (RT)-PCR appeared to be unstable and not persistent. Taken together, our data suggest that LNL6 is a suitable vector for gene marking of hematopoietic progenitors but not for gene therapy protocols based on persistent gene expression.
authors.affiliation: UCSD Cancer Center.
authors.forename: M
authors.initials: M
authors.lastname: Lu
authors.forename: M
authors.initials: M
authors.lastname: Maruyama
authors.forename: N
authors.initials: N
authors.lastname: Zhang
authors.forename: F
authors.initials: F
authors.lastname: Levine
authors.forename: T
authors.initials: T
authors.lastname: Friedmann
authors.forename: A D
authors.initials: AD
authors.lastname: Ho
mesh_terms: D015703:Antigens, CD; D018952:Antigens, CD34; D000971:Antineoplastic Combined Chemotherapy Protocols / Q000008:administration & dosage / Q000627:therapeutic use*; D001483:Base Sequence; D015415:Biomarkers; D001773:Blood Cells / Q000187:drug effects / Q000276:immunology / Q000378:metabolism; D016913:Blood Component Transfusion; D001943:Breast Neoplasms / Q000097:blood* / Q000188:drug therapy; D002455:Cell Division / Q000187:drug effects; D002469:Cell Separation; D002478:Cells, Cultured; D005822:Genetic Vectors; D016178:Granulocyte-Macrophage Colony-Stimulating Factor / Q000008:administration & dosage / Q000494:pharmacology*; D006412:Hematopoietic Stem Cells / Q000187:drug effects / Q000276:immunology / Q000378:metabolism; D006801:Humans; D016219:Immunotherapy, Adoptive / Q000379:methods*; D019868:Kanamycin Kinase; D008969:Molecular Sequence Data; D017853:Phosphotransferases (Alcohol Group Acceptor) / Q000096:biosynthesis / Q000235:genetics; D016133:Polymerase Chain Reaction; D011993:Recombinant Fusion Proteins / Q000096:biosynthesis* / Q000235:genetics; D012091:Repetitive Sequences, Nucleic Acid; D012190:Retroviridae / Q000235:genetics; D014161:Transduction, Genetic
chemical_list: D015703:Antigens, CD; D018952:Antigens, CD34; D015415:Biomarkers; D011993:Recombinant Fusion Proteins; D016178:Granulocyte-Macrophage Colony-Stimulating Factor; D017853:Phosphotransferases (Alcohol Group Acceptor); D019868:Kanamycin Kinase