title: Down-regulation of CD105 is associated with multi-lineage differentiation in human umbilical cord blood-derived mesenchymal stem cells.
abstract: Umbilical cord blood-derived mesenchymal stem cells (UCB-MSCs) have multi-lineage differentiation potential, thus highlighting the feasibility of using UCB-MSCs as a valuable source of stem-cells for cell-based therapy. However, there are no well-defined markers for assessment of the multi-potency of UCB-MSCs. Thus, we focused on the identification of suitable markers by examining cell surface protein expressions of UCB-MSCs as their multi-lineage differentiations progressed. The expression of CD105, one of the cell surface proteins, was significantly decreased in differentiated osteoblasts, chondrocytes, adipocytes, and respiratory epithelium, and the portion of CD105-positive cells from 99.4+/-0.1% to 3.5+/-1.4%, 3.5+/-2.3%, 16.7+/-3.6%, and 2.1+/-1.5%, respectively. As to such indicators as alkaline phosphatase (ALP), glycosaminoglycan (GAG), oil Red O, and surfactant protein C (SPC), they showed increases, confirming differentiation of UCB-MSCs into osteoblasts, chondrocytes, adipocytes, and respiratory epithelium. This is the first study to demonstrate a negative correlation between expression of CD105 over the time course of multi-lineage differentiation and the degree of differentiation of UCB-MSCs. We propose that CD105 is a useful novel marker to characterize differentiation status of isolated human UCB-MSCs, which will be useful to facilitate the application of such cells in stem-cell therapy.
authors.affiliation: Biomedical Research Institute, MEDIPOST Co., Ltd., Seocho-Gu, Seoul, Republic of Korea.
authors.forename: Hye Jin
authors.initials: HJ
authors.lastname: Jin
authors.forename: Se Kyong
authors.initials: SK
authors.lastname: Park
authors.forename: Wonil
authors.initials: W
authors.lastname: Oh
authors.forename: Yoon Sun
authors.initials: YS
authors.lastname: Yang
authors.forename: Seong Who
authors.initials: SW
authors.lastname: Kim
authors.forename: Soo Jin
authors.initials: SJ
authors.lastname: Choi
mesh_terms: D015703:Antigens, CD / Q000378:metabolism*; D015415:Biomarkers / Q000378:metabolism; D002454:Cell Differentiation; D019070:Cell Lineage; D002469:Cell Separation; D015536:Down-Regulation; D000071063:Endoglin; D006801:Humans; D059630:Mesenchymal Stem Cells / Q000166:cytology* / Q000378:metabolism; D011956:Receptors, Cell Surface / Q000378:metabolism*; D014470:Umbilical Cord / Q000166:cytology* / Q000378:metabolism
chemical_list: D015703:Antigens, CD; D015415:Biomarkers; C064206:ENG protein, human; D000071063:Endoglin; D011956:Receptors, Cell Surface