title: Platelet growth factors suppress ex vivo expansion and enhance differentiation of umbilical cord blood CD133+ stem cells to megakaryocyte progenitor cells.
abstract: OBJECTIVE
  Umbilical cord blood (UCB) is a rich source of hematopoietic cells. Here, for the first time, we surveyed the effects of different concentrations of platelet growth factors and cytokine cocktail (CC) on the expansion and differentiation of UCB CD133(+) stem cells into megakaryocyte progenitors.
  
  
  METHODS
  UCB CD133(+) cells were separated by magnetic cell sorting and cultured in different concentrations of platelet growth factors in combination with a CC containing interleukins 3 and 6, stem cell factor, and thrombopoietin. Cell expansion and differentiation were assessed using mononuclear cell count and flow cytometry.
  
  
  RESULTS
  The results show that either activated platelet-rich plasma or the platelet supernatant, when added in the first day of culture, significantly suppress the expansion of CD133(+) cells after 7 days in culture (p < 0.05). By contrast, the expression of CD41, CD61, and CD42b markers in the presence of all platelet growth factors increased compared with that of the control (p < 0.05).
  
  
  CONCLUSIONS
  Taken together, platelet growth factors in the presence of CC suppress ex vivo expansion of UCB CD133(+) cells and enhance their differentiation into megakaryocytic progenitor cells in a dose- and time-dependent manner.
authors.affiliation: Research Center, Iranian Blood Transfusion Organization, Tehran, Iran.
authors.forename: Ali Noroozi
authors.initials: AN
authors.lastname: Aghideh
authors.forename: Maryam
authors.initials: M
authors.lastname: Kheirandish
authors.forename: Hassan
authors.initials: H
authors.lastname: Abolghasemi
authors.forename: Ahmad
authors.initials: A
authors.lastname: Gharehbaghian
mesh_terms: D000071916:AC133 Antigen; D015703:Antigens, CD / Q000032:analysis; D001792:Blood Platelets; D002478:Cells, Cultured; D016207:Cytokines / Q000378:metabolism; D005260:Female; D005312:Fetal Blood / Q000166:cytology; D005434:Flow Cytometry; D006023:Glycoproteins / Q000032:analysis; D006412:Hematopoietic Stem Cells / Q000166:cytology* / Q000378:metabolism; D006801:Humans; D039661:Integrin beta3 / Q000378:metabolism; D036341:Intercellular Signaling Peptides and Proteins / Q000378:metabolism*; D055016:Megakaryocyte Progenitor Cells / Q000166:cytology* / Q000378:metabolism; D010455:Peptides / Q000032:analysis; D019038:Platelet Glycoprotein GPIb-IX Complex / Q000378:metabolism; D040201:Platelet Membrane Glycoprotein IIb / Q000378:metabolism; D010982:Platelet-Derived Growth Factor / Q000378:metabolism*; D053657:Platelet-Rich Plasma / Q000378:metabolism; D011247:Pregnancy; D013234:Stem Cells / Q000378:metabolism*; D034061:Thrombopoiesis
chemical_list: D000071916:AC133 Antigen; D015703:Antigens, CD; D016207:Cytokines; D006023:Glycoproteins; D039661:Integrin beta3; D036341:Intercellular Signaling Peptides and Proteins; C000606023:PROM1 protein, human; D010455:Peptides; D019038:Platelet Glycoprotein GPIb-IX Complex; D040201:Platelet Membrane Glycoprotein IIb; D010982:Platelet-Derived Growth Factor