Expansion on specific substrates regulates the phenotype and differentiation capacity of human articular chondrocytes

Barbero, Andrea and Grogan, Shawn Patrick and Mainil-Varlet, Pierre and Martin, Ivan. (2006) Expansion on specific substrates regulates the phenotype and differentiation capacity of human articular chondrocytes. Journal of Cellular Biochemistry, 2006. pp. 1140-1149.

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In this study, we investigated if monolayer expansion of adult human articular chondrocytes (AHAC) on specific substrates regulates cell phenotype and post-expansion multilineage differentiation ability. AHAC isolated from cartilage biopsies of five donors were expanded on plastic dishes (PL), on dishes coated with collagen type 11 (COL), or on slides coated with a ceramic material (Osteologic (TM), OS). The phenotype of expanded chondrocytes was assessed by flow cytometry and real-time RT-PCR. Cells were then cultured in previously established conditions promoting differentiation toward the chondrogenic or osteogenic lineage. AHAC differentiation was assessed histologically, biochemically, and by real-time RT-PCR. As compared to PL-expanded AHAC, those expanded on COL did not exhibit major phenotypic changes, whereas OS-expanded cells expressed (i) higher bone sialoprotein (BSP) (22.6-fold) and lower collagen type II (9.3-fold) mRNA levels, and (ii) lower CD26, CD90 and CD140 surface protein levels (1.4-11.1-fold). Following chondrogenic differentiation, COL-expanded AHAC expressed higher mRNA levels of collagen type II (2.3-fold) and formed tissues with higher glycosaminoglycan (GAG) contents (1.7-fold), whereas OS-expanded cells expressed 16.5-fold lower collagen type 11 and generated pellets with 2.0-fold lower GAG contents. Following osteogenic differentiation, OS-expanded cells expressed higher levels of BSP (3.9-fold) and collagen type I (2.8-fold) mRNA. In summary, AHAC expansion on COL or OS modulated the de-differentiated cell phenotype and improved the cell differentiation capacity respectively toward the chondrogenic or osteogenic lineage. Phenotypic changes induced by AHAC expansion on specific substrates may mimic pathophysiological events Occurring at different stages of osteoarthritis and may be relevant for the engineering of osteochondral tissues.
Faculties and Departments:03 Faculty of Medicine > Departement Biomedizin > Department of Biomedicine, University Hospital Basel > Tissue Engineering (Martin)
UniBasel Contributors:Martin, Ivan
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Alan R. Liss
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:21 Dec 2017 07:45
Deposited On:22 Mar 2012 13:39

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