title: Optimization of the culturing conditions of human umbilical cord blood-derived endothelial colony-forming cells under xeno-free conditions applying a transcriptomic approach.
abstract: Establishment of fetal bovine serum (FBS)-free cell culture conditions is essential for transplantation therapies. Blood-derived endothelial colony-forming cells (ECFCs) are potential candidates for regenerative medicine applications. ECFCs were isolated from term umbilical cord blood units and characterized by flow cytometry, capillary formation and responsiveness to cytokines. ECFCs were expanded under standard, FBS-containing endothelial medium, or transferred to chemically defined endothelial media without FBS. Microarray expression profiling was applied to compare the transcriptome profiles in FBS-containing versus FBS-free culture. ECFC outgrowth in standard medium was successful in 92% of cord blood units. The karyotype of expanded ECFCs remained normal. Without FBS, ECFC initiation and expansion failed. Modest proliferation, changes in cell morphology and organization and cell death have been observed after passaging. Gene ontology analysis revealed a broad down-regulation of genes involved in cell cycle progression and up-regulation of genes involved in stress response and apoptosis. Interestingly, genes participating in lipid biosynthesis were markedly up-regulated. Detection of several endothelial cell-specific marker genes showed the maintenance of the endothelial cell characteristics during serum-free culture. Although ECFCs maintain their endothelial characteristics during serum-free culturing, they could not be expanded. Additional supply of FBS-free media with lipid concentrates might increase the ECFC survival.
authors.affiliation: Department of Obstetrics, University Hospital Zurich, Switzerland. steffen.zeisberger@usz.ch
authors.forename: Steffen M
authors.initials: SM
authors.lastname: Zeisberger
authors.forename: Stefan
authors.initials: S
authors.lastname: Zoller
authors.forename: Mariluce
authors.initials: M
authors.lastname: Riegel
authors.forename: Shuhua
authors.initials: S
authors.lastname: Chen
authors.forename: Guido
authors.initials: G
authors.lastname: Krenning
authors.forename: Martin C
authors.initials: MC
authors.lastname: Harmsen
authors.forename: Agapios
authors.initials: A
authors.lastname: Sachinidis
authors.forename: Andreas H
authors.initials: AH
authors.lastname: Zisch
mesh_terms: D000818:Animals; D002417:Cattle; D018929:Cell Culture Techniques / Q000379:methods*; D048430:Cell Shape / Q000187:drug effects; D002470:Cell Survival / Q000187:drug effects; D002478:Cells, Cultured; D016895:Culture Media, Serum-Free / Q000494:pharmacology; D042783:Endothelial Cells / Q000166:cytology* / Q000187:drug effects; D005312:Fetal Blood / Q000166:cytology*; D020869:Gene Expression Profiling; D018380:Hematopoietic Stem Cell Transplantation; D006801:Humans
chemical_list: D016895:Culture Media, Serum-Free