title: [Ex vivo expansion of CD34+ cells from human umbilical cord blood by FL gene transfected bone marrow stromal cells].
abstract: The object of this study was to explore the effect of FL gene transfected marrow stromal cells on expansion of human cord blood CD34(+) cells ex vivo. A co-culture system was established with FL gene transfected human marrow stromal cells and cord blood CD34(+) cells. The CD34(+) cells were cultured in different culture systems with different combinations of stromal cells and SCF, IL-3 and FL. The numbers of total nucleated cells, CFCs and CD34(+) cells were repeatedly counted in culture systems for 3 weeks. The results showed that the FL transgenic marrow stromal cell feeder layer significantly enhanced the expansion of total nucleated cells, CFC and CD34(+) cells, compared with stromal cell feeder layer and stromal cell-free culture systems. The transgenic stromal cells and cytokines co-culture system manifested the most potent expansion of the cord blood cells with increase of the number of total nucleated cells by (122.5 +/- 4.3)-fold, CFCs by (39.6 +/- 2.7)-fold and CD34(+) cells by (11.8 +/- 0.52)-fold. It is concluded that human umbilical cord blood CD34(+) cells can be extensively expanded ex vivo by using FL gene transfected stromal cells combined with cytokines.
authors.affiliation: Department of Cell Biology, Institute of Basic Medical Sciences, Academy of Military Medical Sciences, Beijing 100850, China.
authors.forename: Gang
authors.initials: G
authors.lastname: Liu
authors.forename: Yi
authors.initials: Y
authors.lastname: Zhang
authors.forename: Yuan-Lin
authors.initials: YL
authors.lastname: Liu
authors.forename: Jin
authors.initials: J
authors.lastname: He
authors.forename: Xiao-Xia
authors.initials: XX
authors.lastname: Jiang
authors.forename: Ning
authors.initials: N
authors.lastname: Mao
mesh_terms: D018952:Antigens, CD34 / Q000032:analysis*; D002469:Cell Separation; D005312:Fetal Blood / Q000166:cytology*; D006412:Hematopoietic Stem Cells / Q000166:cytology*; D006801:Humans; D007377:Interleukin-3 / Q000494:pharmacology; D008565:Membrane Proteins / Q000502:physiology*; D019089:Stem Cell Factor / Q000494:pharmacology; D014162:Transfection
chemical_list: D018952:Antigens, CD34; D007377:Interleukin-3; D008565:Membrane Proteins; D019089:Stem Cell Factor; C084881:flt3 ligand protein