title: P-glycoprotein expression in extracellular matrix formation of chondrogenic differentiation of human adult stem cells.
abstract: Mesenchymal stem cell (MSC) has been known as a good source of progenitor for multiple connective tissue including cartilage, muscle, adipocyte, and bone. P-glycoproteins (P-gps) also known as ABCB1 that exports diverse substrates are the product of the multidrug resistance-1 (MDR-1) gene. P-gp expression has been reported in chondrosarcoma and hypertrophic chondrocyte in the human growth plate. This study was designed to investigate the expression of P-gp during chondrogenic differentiation of adult human stem cells. Bone marrow samples were obtained from nine human donors after informed consent. The isolated mononuclear cells (MNCs) were incubated as one pellet/tube and 0.5ml chondrogenic medium in the presence of 10ng/ml of TGF-beta 1 and TGF-beta 3 for 28 days. The expression of surface P-gps was analyzed by flow cytometry and quantitative RT-PCR was performed for the detection of mRNA expression of MDR-1 and type II collagen gene. Total collagen and glycosaminoglycan (GAG) contents of the pellets were measured. Surface P-gp expression of the MSCs was decreased during chondrogenic differentiation. MDR-1 gene was decreased 10-fold after the 2-week incubation whereas type II collagen gene was increased 491-fold after the 4-week incubation in chondrogenic medium. The total amount of collagen and GAG were increased during pellet culture. This study has demonstrated a decrease in expression of P-gp and down regulation of MDR-1 gene consistently by flow cytometry and quantitative RT-PCR, but an increased expression of type II collagen on MSC during chondrogenesis.
authors.affiliation: Department of Laboratory Medicine, Catholic University of Daegu, School of Medicine, 3056-6, Daemyung 4 dong, Nam-gu, Daegu, Republic of Korea. sgkim@cu.ac.kr
authors.forename: Sang Gyung
authors.initials: SG
authors.lastname: Kim
authors.forename: Chang Ho
authors.initials: CH
authors.lastname: Jeon
authors.forename: Hun Suk
authors.initials: HS
authors.lastname: Suh
authors.forename: Jung-Yoon
authors.initials: JY
authors.lastname: Choe
authors.forename: Im-Hee
authors.initials: IH
authors.lastname: Shin
mesh_terms: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1 / Q000235:genetics* / Q000378:metabolism*; D053687:Adult Stem Cells / Q000166:cytology* / Q000378:metabolism*; D001854:Bone Marrow Cells / Q000166:cytology; D002454:Cell Differentiation; D002469:Cell Separation; D002470:Cell Survival; D002478:Cells, Cultured; D020219:Chondrogenesis; D024043:Collagen Type II / Q000235:genetics / Q000378:metabolism; D005109:Extracellular Matrix / Q000378:metabolism*; D005434:Flow Cytometry; D005786:Gene Expression Regulation; D006025:Glycosaminoglycans / Q000378:metabolism; D006801:Humans; D059630:Mesenchymal Stem Cells / Q000166:cytology
chemical_list: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D024043:Collagen Type II; D006025:Glycosaminoglycans