title: The activity in ex vivo expansion of cord blood myeloid progenitor cells before and after cryopreservation.
abstract: A total of 50 human umbilical cord blood (UCB) samples were studied. The hematopoietic stem/progenitor (CD34+) populations were isolated from UCB mononuclear cells (MNC) by means of immunomagnetic separation. Double immunofluorescent staining of UCB CD34+ cells revealed that there was a high proportion (82.33 +/- 4.47%) of CD34+ cells co-expressing CD13, while the percentage of CD34+ CD33+ cells was much lower (22.17 +/- 3.35%). In contrast, for co-expressing lymphoid differentiation antigens, the proportion of CD34+CD38+ cells (38.34 +/- 6.09%) was relatively higher than that of CD34+CD10+ cells (11.52 +/- 1.24%) or CD34+CD2+ cells (9.84 +/- 2.30%). For stimulating the ex vivo expansion of UCB progenitor cells, no single hematopoietic growth factor (HGF) was efficacious when used alone, while combination of 4 HGFs, such as GM-CSF, G-CSF, IL-3, and SCF could induce a 55-fold increase in the myeloid progenitor cells, day-14 CFU-GM, in a short term of 7 days' liquid culture. Cryopreservation of UCB as MNC preparations at -196 degrees C could satisfactorily retain the number and activity of CD34+ cells. After thawing, a high recovery rate of about 80% CD34+ cells was obtained. When suspended in liquid cultures containing a combination of 4 HGFs, as shown above, the frozen cord blood progenitor cells could be well expanded, reaching a >50-fold increase in day-14 CFU-GM, which was very similar to that of the fresh UCB samples. In addition, a similar result was also seen in CFU-GEMM, indicating that after cryopreservation the recovered UCB progenitor cells retain an intact clonogeneic ability capable of efficiently responding to hematopoietic growth factors for ex vivo expansion.
authors.affiliation: Department of Medical Research, Veterans General Hospital-Taipei, 201 Shih-pai Road, Taipei 11217, Taiwan, ROC. sywang@vghtpe.gov.tw
authors.forename: S Y
authors.initials: SY
authors.lastname: Wang
authors.forename: M L
authors.initials: ML
authors.lastname: Hsu
authors.forename: M Z
authors.initials: MZ
authors.lastname: Huang
authors.forename: H C
authors.initials: HC
authors.lastname: Hsu
authors.forename: C H
authors.initials: CH
authors.lastname: Tzeng
authors.forename: J H
authors.initials: JH
authors.lastname: Hung
authors.forename: C K
authors.initials: CK
authors.lastname: Ho
mesh_terms: D036541:ADP-ribosyl Cyclase; D051997:ADP-ribosyl Cyclase 1; D015703:Antigens, CD / Q000032:analysis; D018952:Antigens, CD34 / Q000032:analysis; D000943:Antigens, Differentiation / Q000032:analysis; D015214:Antigens, Differentiation, Myelomonocytic / Q000032:analysis; D018801:CD2 Antigens / Q000032:analysis; D002455:Cell Division; D002478:Cells, Cultured; D015925:Cryopreservation; D005312:Fetal Blood / Q000166:cytology*; D016179:Granulocyte Colony-Stimulating Factor / Q000494:pharmacology; D016178:Granulocyte-Macrophage Colony-Stimulating Factor / Q000494:pharmacology; D006098:Granulocytes / Q000166:cytology* / Q000276:immunology; D006412:Hematopoietic Stem Cells / Q000166:cytology* / Q000276:immunology; D006801:Humans; D016130:Immunophenotyping; D007231:Infant, Newborn; D007377:Interleukin-3 / Q000494:pharmacology; D008562:Membrane Glycoproteins; D009244:NAD+ Nucleosidase / Q000032:analysis; D015260:Neprilysin / Q000032:analysis; D063268:Sialic Acid Binding Ig-like Lectin 3; D019089:Stem Cell Factor / Q000494:pharmacology
chemical_list: D015703:Antigens, CD; D018952:Antigens, CD34; D000943:Antigens, Differentiation; D015214:Antigens, Differentiation, Myelomonocytic; D018801:CD2 Antigens; C571163:CD33 protein, human; D007377:Interleukin-3; D008562:Membrane Glycoproteins; D063268:Sialic Acid Binding Ig-like Lectin 3; D019089:Stem Cell Factor; D016179:Granulocyte Colony-Stimulating Factor; D016178:Granulocyte-Macrophage Colony-Stimulating Factor; D036541:ADP-ribosyl Cyclase; C498154:CD38 protein, human; D009244:NAD+ Nucleosidase; D051997:ADP-ribosyl Cyclase 1; D015260:Neprilysin