Abstract:
:Cartilage-derived growth factors, enhance proteoglycan synthesis in cultured chick-embryo chondrocytes, and have almost no effect on cell proliferation. Addition of cartilage derived growth factors to cartilage cells loaded with the fluorescent Ca2+ indicator quin 2, caused a rapid, concentration dependent decrease in cytoplasmic free Ca2+. This decrease persisted also in Ca2+-free medium, indicating that it is not mediated by a decrease in the passive permeability of cell membrane to Ca2+. Addition of the Ca2+ ionophore A23187, with or without cartilage derived factors, caused an increase in cytoplasmic free Ca2+ together with inhibition of proteoglycan synthesis and enhanced cell proliferation. The results may indicate that whereas cell proliferation in chondrocytes is signaled by an increase in cytoplasmic Ca2+ ([Ca2+]in), proteoglycan synthesis is signaled by a decrease in [Ca2+]in. The data lead to suggesting a mechanism for antagonistic regulation of cell proliferation and the expression of the differentiated state.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Eilam Y,Beit-Or A,Nevo Zdoi
10.1016/0006-291x(85)91199-4subject
Has Abstractpub_date
1985-10-30 00:00:00pages
770-9issue
2eissn
0006-291Xissn
1090-2104pii
0006-291X(85)91199-4journal_volume
132pub_type
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journal_title:Biochemical and biophysical research communications
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journal_title:Biochemical and biophysical research communications
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journal_title:Biochemical and biophysical research communications
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journal_title:Biochemical and biophysical research communications
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journal_title:Biochemical and biophysical research communications
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