Abstract:
:Platelet-derived growth factor (PDGF) stimulates the expression of a number of genes associated with entry of quiescent Balb/c-3T3 fibroblasts into the cell cycle. We determined that two of these genes, c-myc and c-fos, are induced equivalently in medium supplemented with platelet-poor plasma (PPP) and either PDGF-BB or PDGF-AA. The rate at which fibroblasts entered S phase was also similar in PDGF-BB- and AA-treated cells as was the expression of the late G1 gene, thymidine kinase (TK). However, PDGF-AA must be present for a period of 16 h to stimulate the proliferation of 90% of the cells, whereas PDGF-BB was required for only 4 h. Exposure of cells to PDGF-AA for 4 h, a time during which maximum expression of c-fos and c-myc occurred, only induced 20% of the cells in a quiescent population to enter the cell cycle. Therefore, PDGF-AA-mediated expression of the immediate early genes c-fos and c-myc may be necessary but is not sufficient to rapidly stimulate density-arrested Balb/c-3T3 fibroblasts into the competent state. Thus, these data suggest that PDGF-AA and PDGF-BB initiate traverse of the cell cycle by distinct mechanisms.
journal_name
J Cell Biochemjournal_title
Journal of cellular biochemistryauthors
Coats SR,Olson JE,Pledger WJdoi
10.1002/jcb.240480304subject
Has Abstractpub_date
1992-03-01 00:00:00pages
242-7issue
3eissn
0730-2312issn
1097-4644journal_volume
48pub_type
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