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- Publisher
- Wiley
- Copyright
- Copyright © 2001 Wiley Subscription Services, Inc., A Wiley Company
- ISSN
- 0730-2312
- eISSN
- 1097-4644
- DOI
- 10.1002/1097-4644(20010501)81:2<368::AID-JCB1051>3.0.CO;2-J
- Publisher site
- See Article on Publisher Site
Abstract
Adult human articular chondrocytes were expanded in a medium with 10% serum (CTR) or further supplemented with different mitogens (i.e., EGF, PDGFbb, FGF‐2, TGFβ1, or FGF‐2/TGFβ1). Cells were then induced to redifferentiate in 3D pellets using serum‐supplemented medium (SSM), serum‐free medium (SFM), or SFM supplemented with factors inducing differentiation of chondroprogenitor cells (i.e., TGFβ1 and/or dexamethasone). All factors tested during expansion enhanced chondrocyte proliferation and dedifferentiation, as assessed by the mRNA ratios of collagen type II to type I (CII/CI) and aggrecan to versican (Agg/Ver), using real‐time PCR. FGF‐2/TGFβ1‐expanded chondrocytes displayed the lowest doubling times, CII/CI and Agg/Ver ratios, averaging, respectively, 50, 0.2 and 15% of CTR‐expanded cells. Redifferentiation in pellets was more efficient in SFM than SSM only for EGF‐, PDGFbb‐ or FGF‐2‐expanded chondrocytes. Upon supplementation of SFM with TGFβ and dexamethasone (SFM TD), CII/CI ratios decreased 4.4‐fold for EGF‐ and PDGFbb‐expanded chondrocytes, but increased 96‐fold for FGF‐2/TGFβ1‐expanded cells. Chondrocytes expanded with FGF‐2/TGFβ1 and redifferentiated in SFM TD expressed the largest mRNA amounts of CII and aggrecan and generated cartilaginous tissues with the highest accumulation of glycosaminoglycans and collagen type II. Our results provide evidence that growth factors during chondrocyte expansion not only influence cell proliferation and differentiation, but also the cell potential to redifferentiate and respond to regulatory molecules upon transfer into a 3D environment. J. Cell. Biochem. 81:368–377, 2001. © 2001 Wiley‐Liss, Inc.
Journal
Journal of Cellular Biochemistry – Wiley
Published: Jan 1, 2001
Keywords: ; ; ; ;