Growth factor regulation of the promoter for calcyclin, a growth-regulated gene.
The steady-state levels of calcyclin mRNA are regulated by growth factors. Using deletion mutants of the 5'-flanking region and a linked reporter (the bacterial chloroamphenicol transferase gene), we have investigated the elements of the calcyclin gene's promoter that respond to growth factors. By a transient expression assay after transfection in BALB/c/3T3 cells, we have been able to show that the serum-inducible sequences are contained in a 164-base pair fragment just upstream of the cap site. This fragment also contains an enhancer, and responds to platelet-derived growth factor as well as to serum. The sequences from -1371 to -1194 upstream of the cap site contain an element which is negatively regulated by epidermal growth factor. These findings have been confirmed in hamster cell lines in which the deletion mutants of the calcyclin promoter controlled the expression of the cDNA for human thymidine kinase. These results indicate that, like in other growth-regulated genes the activity of the calcyclin promoter is modulated by both positive and negative elements. Even more intriguing, though, is the finding that some of these negative elements may be influenced by growth factors in the environment.
Ghezzo
F
F
Department of Pathology, Temple University Medical School, Philadelphia, Pennsylvania 19140.
Lauret
E
E
Ferrari
S
S
Baserga
R
R
D000818:Animals; D001769:Blood; D002135:Calcium-Binding Proteins / Q000235:genetics*; D018797:Cell Cycle Proteins; D002478:Cells, Cultured; D003470:Culture Media; D004262:DNA Restriction Enzymes; D004815:Epidermal Growth Factor / Q000494:pharmacology*; D005796:Genes / Q000187:drug effects*; D051379:Mice; D008807:Mice, Inbred BALB C; D009154:Mutation; D010957:Plasmids; D010982:Platelet-Derived Growth Factor / Q000494:pharmacology*; D011401:Promoter Regions, Genetic / Q000187:drug effects*; D012333:RNA, Messenger / Q000235:genetics; D000075383:S100 Calcium Binding Protein A6; D009418:S100 Proteins; D014158:Transcription, Genetic / Q000187:drug effects*; D014162:Transfection
D002135:Calcium-Binding Proteins; D018797:Cell Cycle Proteins; D003470:Culture Media; D010982:Platelet-Derived Growth Factor; D012333:RNA, Messenger; D000075383:S100 Calcium Binding Protein A6; D009418:S100 Proteins; C489134:S100a6 protein, mouse; D004815:Epidermal Growth Factor; D004262:DNA Restriction Enzymes