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Eguchi, Takanori; Kubota, Satoshi; Kondo, Seiji; Kuboki, Takuo; Yatani, Hirofumi; Takigawa, Masaharu
Biochemical and biophysical research communications, 07/2002, Letnik: 295, Številka: 2Journal Article
To clarify the chondrocyte-specific regulatory mechanism of connective tissue growth factor ( ctgf) gene expression, we analyzed the functionality and DNA–protein interaction of the CTGF promoter. Comparative luciferase assay of the CTGF promoter deletion mutants among HCS-2/8 chondrocytic cells and fibroblastic cells revealed that a 110-bp region in the promoter was crucial for the HCS-2/8-specific transcriptional enhancement. Subsequent competitive gel shift assay revealed that transcription factors in HCS-2/8 nuclei bound to a 60-bp portion in the corresponding region. Relative luciferase activity from a CTGF promoter with mutant TGF-β response element (TbRE) was 16.9% lower than that from an intact promoter. On the other hand, relative luciferase activity from a CTGF promoter with 4 bp point mutations at 30 bp upstream of the TbRE was 47.7% lower than that from the intact one. The binding activity of HCS-2/8 nuclear factor(s) to the sequence over the 4-bp was remarkably higher than that of any nuclear extract from other types of cells. Therefore, we entitled the sequence `TRENDIC', a transcription enhancer dominant in chondrocytes, which stands for a novel enhancer for chondrocyte-specific CTGF gene expression.
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