Development-associated differences in integrative cartilage repair: roles of biosynthesis and matrix

A recurring problem in tissue transplantation therapies for articular cartilage defects is the lack of integration between the implant and the host cartilage. Previous studies have shown that in vitro integration between explants of calf cartilage is markedly higher than that between fetal cartilage...

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Bibliographic Details
Published in:Journal of orthopaedic research 2002-11, Vol.20 (6), p.1274-1281
Main Authors: Giurea, Alexander, DiMicco, Michael A, Akeson, Wayne H, Sah, Robert L
Format: Article
Language:English
Subjects:
Animals
Biomechanical Phenomena
Cartilage - cytology
Cartilage - metabolism
Cartilage - transplantation
Cattle
Coculture Techniques
Extracellular Matrix - metabolism
Fetal Tissue Transplantation
Proline - pharmacokinetics
Tritium
Wound Healing - physiology
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Summary:A recurring problem in tissue transplantation therapies for articular cartilage defects is the lack of integration between the implant and the host cartilage. Previous studies have shown that in vitro integration between explants of calf cartilage is markedly higher than that between fetal cartilage, despite similarly high levels of deposition of newly synthesized collagen. The aim of this study was to determine if cellular biosynthesis and extracellular matrix each contribute to these development-associated differences in integrative repair in vitro. The approach taken was to examine integration between specific combinations of cartilage explants that were apposed for two weeks. The cartilage matrix showed different propensities for repair, as integration of calf live cartilage to calf devitalized cartilage was greater than that of calf live cartilage to fetal devitalized cartilage. An inhibiting factor appeared to be present in fetal cartilage matrix since guanidine treatment of fetal devitalized cartilage was able to enhance its integration. The difference between integration to living cartilage and integration to devitalized cartilage, for calf and fetal tissue, indicated that the biosynthetic contribution to integration by calf cartilage was greater than the biosynthetic contribution by fetal cartilage. Thus, the increasing level of integration between fetal and fetal cartilage, fetal and calf cartilage, and calf and calf cartilage appeared to reflect both biosynthetic and matrix differences. Therapeutic strategies to enhance integration to cartilage may thus target both the extracellular components and the cellular biosynthetic activities of implants and host cartilage.
ISSN:0736-0266
1554-527X
DOI:10.1016/S0736-0266(02)00084-0