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Isolation and localization of basic fibroblast growth factor‐immunoreactive substance in the epiphyseal growth plate
Author(s) -
Twal W.O.,
VasilatosYounken R.,
Gay C.V.,
Leach R.M.
Publication year - 1994
Publication title -
journal of bone and mineral research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.882
H-Index - 241
eISSN - 1523-4681
pISSN - 0884-0431
DOI - 10.1002/jbmr.5650091110
Subject(s) - basic fibroblast growth factor , chondrocyte , cartilage , fibroblast growth factor , sepharose , growth factor , biology , endocrinology , medicine , blot , chemistry , biochemistry , anatomy , receptor , gene , enzyme
Abstract Previous research in our laboratory has shown basic fibroblast growth factor (bFGF) to be a permissive mitogen for isolated avian growth plate chondrocytes. The present study was conducted to determine whether bFGF is present in avian growth plate and, if present, to determine its localization within the tissue. Immunohistochemical studies revealed that bFGF is present in the resting proliferative and hypertrophic calcifying zones of the growth plate but is absent from the prehypertrophic zone. Basic FGF appears to be associated with the extracellular matrix of the proliferative zone, but it is predominantly intracellular in the hypertrophic and mineralizing zone chondrocytes. Partial purification of cartilage‐derived bFGF was performed on crude extracts of cartilage using heparin‐Sepharose affinity chromatography. The presence of bFGF in the heparin‐Sepharose column fractions was confirmed by immunoblotting and radioimmunoassay. Furthermore, western blot analysis of the extracts showed multiple protein bands having bFGF immunoreactivity, in the molecular weight range 14.4–18 kD. The data support the hypothesis that bFGF has a dual role in the growth plate. In the proliferative zone it acts as a chondrocyte mitogen, whereas when released from terminal hypertrophic chondrocytes, bFGF may serve as a chemotactic signal for metaphyseal blood vessel proliferation.