Response of human chondrocytes prepared for autologous implantation to growth factors.
This study investigated metabolism of autologous chondrocytes after initial expansion immediately before implantation. Chondrocytes cultured in either monolayers or alginate beads were treated with insulin-like growth factor-1 (IGF-1), osteogenic protein-1 (OP-1), or a combination. Proteoglycan synthesis and DNA content were tested in both cultures. Alginate beads also were analyzed with live/dead cell assay, safranin O/fast green stain for histology, and immunohistochemistry with antibodies against collagen type II and VI, aggrecan, decorin, and fibronectin. In monolayers, autologous chondrocytes changed their morphologic appearance. In alginate, they maintained chondrocytic phenotype. Growth factors, especially combined, promoted cell survival and induced chondrocyte proliferation. OP-1 stimulated the largest cartilage-specific matrix and the most accumulation of collagen type II and fibronectin, although the overall matrix synthesized by autologous chondrocyte implantation cells was smaller than that produced by normal chondrocytes. The clinical implications of this study suggest a significant promise for anabolic growth factors in cartilage repair as a potential modifying therapy for the enhancement of chondrocytic phenotype of autologous chondrocytes.
Chubinskaya
Susan
S
Rush University Medical Center, Chicago, Ill, USA.
Hakimiyan
Arnavaz A
AA
Rappoport
Lev
L
Yanke
Adam
A
Rueger
David C
DC
Cole
Brian J
BJ
D000328:Adult; D055419:Bone Morphogenetic Protein 7; D019485:Bone Morphogenetic Proteins / Q000494:pharmacology*; D002358:Cartilage, Articular; D002478:Cells, Cultured; D019902:Chondrocytes / Q000187:drug effects* / Q000502:physiology / Q000637:transplantation; D006801:Humans; D007334:Insulin-Like Growth Factor I / Q000494:pharmacology*; D036341:Intercellular Signaling Peptides and Proteins / Q000494:pharmacology*; D016212:Transforming Growth Factor beta / Q000494:pharmacology*; D014182:Transplantation, Autologous
C525819:BMP7 protein, human; D055419:Bone Morphogenetic Protein 7; D019485:Bone Morphogenetic Proteins; D036341:Intercellular Signaling Peptides and Proteins; D016212:Transforming Growth Factor beta; D007334:Insulin-Like Growth Factor I