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• W2049442243 abstract "Our long-term goal is to treat osteochondral lesions with bioengineered biphasic constructs. We have previously demonstrated that biphasic constructs, created in vitro with primary chondrocytes harvested from healthy joints and a porous calcium polyphosphate (CPP) substrate bone substitute, could successfully repair a focal defect in sheep joints. However, primary chondrocytes are limited in supply and cannot be used in engineering constructs large enough for clinical use. Thus, we developed a robust protocol to predifferentiate sheep bone marrow-derived stromal cells to chondrocytes on collagen-coated polytetrafluoroethane membrane inserts, and harvest the chondrocytes that develop and subsequently culturing these predifferentiated cells scaffold-free on the intended articulation surface of the CPP. Chondrocytes predifferentiated on membrane culture accumulated similar matrix as those in conventional pellet culture, but expressed less Col1a1 RNA. Membrane culture predifferentiated cells gave rise to a functionally superior hyaline cartilage tissue compared to pellet culture predifferentiated cells. Studies demonstrated that 2 weeks of membrane predifferentiation culture followed by 8 weeks of biphasic construct culture was the optimal culture period at which the compressive mechanical strength and the accumulation of extracellular matrix were maximized while avoiding tissue mineralization. This protocol will be used to generate implants for preclinical study to determine their ability to repair osteochondral lesions." @default.
• W2049442243 created "2016-06-24" @default.
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• W2049442243 date "2011-09-01" @default.
• W2049442243 modified "2023-10-16" @default.
• W2049442243 title "Membrane Culture of Bone Marrow Stromal Cells Yields Better Tissue Than Pellet Culture for Engineering Cartilage-Bone Substitute Biphasic Constructs in a Two-Step Process" @default.
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• W2049442243 doi "https://doi.org/10.1089/ten.tec.2011.0147" @default.
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