Abstract:
:We studied the expression of FREK (fibroblast growth factor receptor-like embryonic kinase), a new receptor recently cloned from quail embryo, during the differentiation of skeletal muscle satellite cells and epiphyseal growth-plate chondrocytes. Although FREK mRNA was expressed in both cell types, satellite cells expressed higher levels of this mRNA than chondrocytes. FREK gene expression was found to be modulated by b-FGF in a biphasic manner: low concentrations increased expression, whereas high concentrations attenuated it. In both cell cultures, the levels of FREK mRNA declined during terminal differentiation. Moreover, retinoic acid (RA), which induces skeletal muscle satellite cells to differentiate, also caused a reduction in FREK gene expression in these cells. Induction of chondrocyte differentiation with ascorbic acid was monitored by a decrease in collagen type II gene expression and an increase in alkaline phosphatase activity. Satellite cell differentiation was marked by morphological changes as well as by increased sarcomeric myogenin content and creatine kinase activity and changes in the expression of the regulatory muscle-specific genes, MyoD and myogenin. DNA synthesis in both cell types was stimulated by b-FGF. However, in satellite cells, the response was bell-shaped, peaking at 1 ng/ml b-FGF, whereas in chondrocytes, higher levels of b-FGF were needed. b-FGF-dependent DNA synthesis in satellite cells was decreased by RA at concentrations over 10(-7) M. The observed correlation between the level of FREK gene expression and various stages of differentiation, its modulation by b-FGF and RA, as well as the correlation between FREK gene expression and the physiological response to b-FGF, suggest that this specific FGF receptor plays an important role in muscle and cartilage cell differentiation.
journal_name
Exp Cell Resjournal_title
Experimental cell researchauthors
Halevy O,Monsonego E,Marcelle C,Hodik V,Mett A,Pines Mdoi
10.1006/excr.1994.1144subject
Has Abstractpub_date
1994-06-01 00:00:00pages
278-84issue
2eissn
0014-4827issn
1090-2422pii
S0014-4827(84)71144-Xjournal_volume
212pub_type
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