Abstract
The human adult articular chondrocyte is a unique cell type that has reached a fully differentiated state as an end point of development. Within the cartilage matrix, chondrocytes are normally quiescent and maintain the matrix constituents in a low-turnover state of equilibrium. Isolated chondrocytes in culture have provided useful models to study cellular responses to alterations in the environment such as those occurring in different forms of arthritis. However, expansion of primary chondrocytes in monolayer culture results in the loss of phenotype, particularly if high cell density is not maintained. This chapter describes strategies for maintaining or restoring differentiated phenotype by culture in suspension, gels, or scaffolds. Techniques for assessing phenotype involving primarily the analysis of synthesis of cartilage-specific matrix proteins as well as the corresponding mRNAs are also described. Approaches for studying gene regulation, including transfection of promoter-driven reporter genes with expression vectors for transcriptional and signaling regulators, chromatin immunoprecipitation, and DNA methylation are also described.
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Acknowledgments
Dr. Goldring’s research related to this project was supported in part by grants from the National Institutes of Health, AG022021, AR054887, and AR045378, and the Arthritis Foundation. The authors are grateful to Lujian Tan, Haibing Peng, Lii-Fang Suen, James Birkhead, Merrilee Flannery, James Robbins, Makoto Osaki, and Bob Choy for supplying technical expertise and data, and to Dr. Thomas Sculco at The Hospital for Special Surgery and Dr. Benjamin Bierbaum at the New England Baptist Hospital for supplying cartilage samples. We also wish to acknowledge Dr. Helmtrud (Trudy) I. Roach, recently deceased, for her contributions to our understanding of epigenetics in chondrocytes and for transferring the technology to our laboratory.
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Otero, M. et al. (2012). Human Chondrocyte Cultures as Models of Cartilage-Specific Gene Regulation. In: Mitry, R., Hughes, R. (eds) Human Cell Culture Protocols. Methods in Molecular Biology, vol 806. Humana Press. https://doi.org/10.1007/978-1-61779-367-7_21
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