| Zinc finger transcription factors mediate high constitutive platelet-derived growth factor-B expression in smooth muscle cells derived from aortae of newborn rats. | |
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MedLine Citation:
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PMID: 9488709 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Platelet-derived growth factor (PDGF) B-chain gene is differentially expressed in smooth muscle cells (SMCs) derived from the rat aortic wall. SMCs cultured from two week-old rats (pups) express high levels of PDGF-B mRNA, whereas cells isolated from three month-old rats (adults) express low levels of PDGF-B. Nuclear run-off experiments indicate that increased PDGF-B gene expression in pups is mediated, at least in part, at the transcriptional level. We used electrophoretic mobility shift assays and Western blot analysis to demonstrate that levels of Sp1 and Sp3, two zinc finger transcription factors which mediate basal expression of the PDGF-B gene, are elevated in pup nuclei compared with adult nuclei. The immediate-early transcription factor, Egr-1, which footprints the PDGF-B promoter, is also constitutively expressed in these cells. Transient transfection and binding studies show that these factors interact with a region in the proximal PDGF-B promoter key for basal expression in pup cells. Mutation of this proximal element in transfected pup cells attenuates reporter gene expression to levels observed in adult cells. Conversely, overexpression of Sp1 in adult cells augments PDGF-B promoter-dependent expression. Elevated PDGF-B expression in cultured newborn rat SMCs may therefore require high constitutive expression of a number of zinc finger transcription factors and their specific interactions with the proximal PDGF-B promoter. |
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Authors:
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L A Rafty; L M Khachigian |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: The Journal of biological chemistry Volume: 273 ISSN: 0021-9258 ISO Abbreviation: J. Biol. Chem. Publication Date: 1998 Mar |
Date Detail:
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Created Date: 1998-04-07 Completed Date: 1998-04-07 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 2985121R Medline TA: J Biol Chem Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 5758-64 Citation Subset: IM |
Affiliation:
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The Centre for Thrombosis and Vascular Research, School of Pathology, The University of New South Wales, Sydney, New South Wales 2052, Australia. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Aorta / physiology Cells, Cultured DNA-Binding Proteins / analysis, metabolism Early Growth Response Protein 1 Gene Expression Regulation / genetics Genes, Reporter / genetics Immediate-Early Proteins* Muscle, Smooth, Vascular / physiology Nuclear Proteins / analysis Platelet-Derived Growth Factor / genetics* Promoter Regions, Genetic / genetics Proto-Oncogene Proteins / genetics* Proto-Oncogene Proteins c-sis Rats Sequence Deletion / genetics Sp1 Transcription Factor / metabolism Sp3 Transcription Factor Transcription Factors / metabolism, physiology* Transfection / genetics Zinc Fingers / physiology* |
| Chemical | |
Reg. No./Substance:
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0/DNA-Binding Proteins; 0/Early Growth Response Protein 1; 0/Egr1 protein, rat; 0/Immediate-Early Proteins; 0/Nuclear Proteins; 0/Platelet-Derived Growth Factor; 0/Proto-Oncogene Proteins; 0/Proto-Oncogene Proteins c-sis; 0/Sp1 Transcription Factor; 0/Sp3 protein, rat; 0/Transcription Factors; 148710-94-5/Sp3 Transcription Factor |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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