Sp1-dependent regulation of the tissue inhibitor of metalloproteinases-1 promoter.
Extracellular matrix (ECM) remodeling is involved in many cellular properties such as division, migration, differentiation, and death. The turnover of ECM is regulated by matrix metalloproteinases (MMPs) and the MMPs are inhibited by the tissue inhibitors of metalloproteinases (TIMPs). In this study, the transcriptional regulation of the TIMP-1 promoter was investigated. The 5'-deletion assay showed that the region between -1,200 and -1,101 was responsible for the TIMP-1 promoter activity. The mutations of the two Sp1 sites in this region reduced the transcription activity. In addition, the co-transfection with antisense Sp1 oligonucleotide decreased the promoter activity, suggesting that the transcription of the TIMP-1 promoter is mediated by Sp1. Previously, it was reported that the TIMP-1 expression was enhanced under hypoxia. Therefore, the TIMP-1 promoter activity was investigated with or without cobalt ion, which elicits the same physiological effect as hypoxia. The results showed that the TIMP-1 promoter was induced in the presence of cobalt ion and that the promoter activity was regulated by Sp1 as well as HIF-1. Therefore, this study suggests that Sp1 is involved in the regulation of the TIMP-1 promoter in the presence of cobalt ion as well as in the basal level transcription.
Lee
Minhyung
M
Clinical Research Center, College of Medicine, Inha University, Inchon, Korea. minhyung@kg21.net
Song
Sun U
SU
Ryu
Ji Kan
JK
Suh
Jun Kyu
JK
D016923:Cell Death; D002455:Cell Division / Q000502:physiology; D015687:Cell Hypoxia / Q000235:genetics / Q000502:physiology; D002460:Cell Line; D002465:Cell Movement / Q000502:physiology; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D005109:Extracellular Matrix / Q000502:physiology; D005786:Gene Expression Regulation; D006801:Humans; D051793:Hypoxia-Inducible Factor 1; D051795:Hypoxia-Inducible Factor 1, alpha Subunit; D009154:Mutation / Q000235:genetics / Q000502:physiology; D009687:Nuclear Proteins / Q000235:genetics / Q000378:metabolism*; D011401:Promoter Regions, Genetic / Q000235:genetics* / Q000502:physiology; D012045:Regulatory Sequences, Nucleic Acid / Q000235:genetics / Q000502:physiology; D016329:Sp1 Transcription Factor / Q000235:genetics / Q000378:metabolism*; D019715:Tissue Inhibitor of Metalloproteinase-1 / Q000096:biosynthesis / Q000235:genetics*; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism*
D004268:DNA-Binding Proteins; C497442:HIF1A protein, human; D051793:Hypoxia-Inducible Factor 1; D051795:Hypoxia-Inducible Factor 1, alpha Subunit; D009687:Nuclear Proteins; D016329:Sp1 Transcription Factor; D019715:Tissue Inhibitor of Metalloproteinase-1; D014157:Transcription Factors