title: [Study on granulocytes derived from induction of committed differentiation of hematopoietic stem/progenitor cells ex vivo].
abstract: To evaluated the feasibility of preventing infection after high dose chemotherapy and radiotherapy using the granulocytes derived from differentiated from hematopoietic stem/progenitor cells ex vivo, human CD34-positive cells were isolated from umbilical cord blood by using a high-gradient magnetic cell sorting system (MACS), and the cells committedly differentiated with hematopoietic cytokines (SCF + IL-3 + IL-6 + G-CSF) in a liquid culture system. The expanded cell number, ratio of the viable cells, chromosome and phenotype of the differentiated cells and safety analysis of expanded cells were detected by using cell count, trypan blue exclusion test, karyotype analysis, flow cytometry and tumorigenic model of nude mice, respectively. The results showed that the combination of cytokines increased cell number by (1006.4 +/- 103.2) folds and flow cytometric analysis showed myeloid marker CD11b expressed in the about 60% cells. The growth peak of differentiated cells was at 14 days of culture and decreased at about 33 days. No abnormality was found in the karyotype analysis of expanded cells. No tumor was found in the nude mice injected with expanded cells after 35 days and the expanded cells had the ability of phagocytizing bacteria. It is concluded that the cells, differentiated from CD34(+) cells, expanded ex vivo possess the function of granulocyte and it was safe for clinical trial.
authors.affiliation: Beijing Institute of Transfusion Medicine and Stem Cell Research Center of AMMS, Beijing 100850, China.
authors.forename: Kai
authors.initials: K
authors.lastname: Feng
authors.forename: Fei
authors.initials: F
authors.lastname: Chu
authors.forename: Xue
authors.initials: X
authors.lastname: Nan
authors.forename: Hong-Feng
authors.initials: HF
authors.lastname: Yuan
authors.forename: Dong-Mei
authors.initials: DM
authors.lastname: Wang
authors.forename: Rui
authors.initials: R
authors.lastname: Zhang
authors.forename: Ci-Xian
authors.initials: CX
authors.lastname: Bai
authors.forename: Lin
authors.initials: L
authors.lastname: Chen
authors.forename: Xue-Tao
authors.initials: XT
authors.lastname: Pei
mesh_terms: D000818:Animals; D018952:Antigens, CD34 / Q000032:analysis; D002454:Cell Differentiation; D005312:Fetal Blood / Q000166:cytology; D006098:Granulocytes / Q000166:cytology* / Q000276:immunology; D006412:Hematopoietic Stem Cells / Q000166:cytology*; D006801:Humans; D007621:Karyotyping; D051379:Mice; D008807:Mice, Inbred BALB C; D010587:Phagocytosis
chemical_list: D018952:Antigens, CD34