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Tailoring secretion of proteoglycan 4 (PRG4) in tissue-engineered cartilage

Klein, Travis, Schumacher, Barbara , Blewis, Megan , Schmidt, Tannin , Voegtline, Michael , Thonar, Eugene , Masuda, Koichi , & Sah, Robert (2006) Tailoring secretion of proteoglycan 4 (PRG4) in tissue-engineered cartilage. Tissue Engineering, Part A: Tissue Engineering, 12(6), pp. 1429-1439.

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Abstract

Articular cartilage provides a low-friction surface for joint articulation, with boundary lubrication facilitated by proteoglycan 4 (PRG4), which is secreted by chondrocytes of the superficial zone. Chondrocytes from different zones are phenotypically distinct, and their phenotypes in vitro are influenced by the system in which they are cultured. We hypothesized that culturing cells from the superficial (S) zone in two-dimensional monolayer or three-dimensional alginate would affect their synthesis of PRG4, and that subsequently seeding them atop alginate-recovered cells from the middle/ deep (M) zone in various proportions would result in tissue-engineered constructs with varying levels of PRG4 secretion and matrix accumulation. During monolayer culture, S cells retained their PRG4-secreting phenotype, whereas in alginate culture the percentage of cells secreting PRG4 decreased with time. Constructs formed with increasing percentages of S cells decreased in thickness and matrix accumulation, depending on both the culture conditions before construct formation and the S-cell density. PRG4-secreting cells were localized to the S-cell seeded construct surface, with secretion rates of 0.1–4 pg/cell/day or 0.1–1 pg/cell/day for constructs formed with monolayer-recovered or alginate-recovered S cells, respectively. Tailoring secretion of PRG4 in cartilage constructs may be useful for enhancing low-friction properties at the articular surface, while maintaining other surfaces free of PRG4 for enhancing integration with surrounding tissues.

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16 citations in Web of Science®

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ID Code: 41601
Item Type: Journal Article
Additional Information: Klein, Travis J. Schumacher, Barbara L. Blewis, Megan E. Schmidt, Tannin A. Voegtline, Michael S. Thonar, Eugene J. -Ma Masuda, Koichi Sah, Robert L.
DOI: 10.1089/ten.2006.12.1429
ISSN: 1937-3341
Subjects: Australian and New Zealand Standard Research Classification > BIOLOGICAL SCIENCES (060000) > BIOCHEMISTRY AND CELL BIOLOGY (060100)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > BIOMEDICAL ENGINEERING (090300)
Copyright Owner: Mary Ann Liebert Inc
Deposited On: 26 Aug 2011 12:07
Last Modified: 01 Mar 2012 00:05

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