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Requirement of fibroblast growth factor signaling for regeneration of epiphyseal morphology in rabbit full‐thickness defects of articular cartilage
Author(s) -
Otsuka Yutaka,
Mizuta Hiroshi,
Takagi Katsumasa,
Iyama Kenichi,
Yoshitake Yoshino,
Nishikawa Katsuzo,
Suzuki Fujio,
Hiraki Yuji
Publication year - 1997
Publication title -
development, growth and differentiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.864
H-Index - 66
eISSN - 1440-169X
pISSN - 0012-1592
DOI - 10.1046/j.1440-169x.1997.t01-1-00003.x
Subject(s) - regeneration (biology) , articular cartilage , rabbit (cipher) , microbiology and biotechnology , cartilage , fibroblast growth factor , morphology (biology) , basic fibroblast growth factor , anatomy , growth factor , chemistry , biology , osteoarthritis , pathology , medicine , computer science , biochemistry , alternative medicine , receptor , genetics , computer security
The involvement of fibroblast growth factor‐2 (FGF‐2) during the repair process in rabbit full‐thickness defects of articular cartilage was studied. Fibroblast growth factor‐2 (50 pg/h) was administered for 2 weeks in a 5mm defect of articular cartilage, which is large enough not to repair spontaneously. The administration of FGF‐2 resulted in the regeneration of the articular cartilage and the subchondral bone within 8 weeks. In these defects, undifferentiated mesenchymal cells initiated chondrogenic differentiation coupled with replacement by subchondral bone, resulting in the resurfacing of the defects with hyaline cartilage and the recovery of subchondral bone up to the original bone–articular cartilage junction. In rabbits, full‐thickness defects are capable of regenerating articular cartilage as long as the defect size is limited to ≤3 mm in diameter. In the defects, strong immunoreactivity for FGF‐2 was observed in the granulation tissue filling the defects in the early stage of repair, in association with the expression of FGF‐2 mRNA shown by in situ hybridization. Once the undifferentiated mesenchymal cells had differentiated into chondrocytes, both the immunoreactivity and the in situ hybridization signal declined significantly. Upon the local administration of a monoclonal antibody against FGF‐2 (bFM‐1, 50ng/h), the defects were filled with fibrous tissue and no resurfacing hyaline cartilage was formed. Compared to the non‐treated defects, there were marked increases in FGF‐2 immunoreactivity and the overexpression of FGF‐2 mRNA in the reparative tissue in the bFM‐1 ‐treated defects. This rebound phenomenon indicates that the autocrine FGF‐2 signaling is critically important for the regeneration of articular cartilage.

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