title: Transcriptional regulation of human beta-galactoside alpha2,6-sialyltransferase (hST6Gal I) gene in colon adenocarcinoma cell line.
abstract: Previous studies have shown that hST6Gal I mRNA is overexpressed in colorectal cancer tissues compared with non-malignant or benign tissue. Moreover, Form 1 (hepatic form) mRNA isoform had a marked tendency to accumulate in colon cancer [Int. J. Cancer 88 (2000) 58-65]. These findings suggest that the transcriptional regulation of Form 1 is altered during malignant transformation. We report here transcriptional regulation of the hST6Gal I gene in colon adenocarcinoma cell lines. We characterized P1 promoter region, which regulates Form 1 mRNA expression, using luciferase assays. The result indicates that the nt-156 to -1 region is important for transcriptional activity of hST6Gal I gene in colon adenocarcinoma cell lines. The nt-156 to -1 region contains HNF1 recognition element. Mutation of the HNF1 site reduced luciferase activity by about 80% compared with the wild-type construct, suggesting that HNF1 site is involved in the transcription of Form 1 mRNA in colon cancer cells.
authors.affiliation: Bionic Materials Technology Group, Biomaterials Center, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan.
authors.forename: Liming
authors.initials: L
authors.lastname: Xu
authors.forename: Yoshikazu
authors.initials: Y
authors.lastname: Kurusu
authors.forename: Kaori
authors.initials: K
authors.lastname: Takizawa
authors.forename: Junzo
authors.initials: J
authors.lastname: Tanaka
authors.forename: Kojiro
authors.initials: K
authors.lastname: Matsumoto
authors.forename: Akiyoshi
authors.initials: A
authors.lastname: Taniguchi
mesh_terms: D000230:Adenocarcinoma / Q000235:genetics* / Q000378:metabolism; D001665:Binding Sites; D003110:Colonic Neoplasms / Q000235:genetics* / Q000378:metabolism; D004252:DNA Mutational Analysis; D004268:DNA-Binding Proteins; D004790:Enzyme Induction; D015972:Gene Expression Regulation, Neoplastic; D051537:Hepatocyte Nuclear Factor 1; D051538:Hepatocyte Nuclear Factor 1-alpha; D051539:Hepatocyte Nuclear Factor 1-beta; D006801:Humans; D007527:Isoenzymes / Q000096:biosynthesis / Q000235:genetics; D009687:Nuclear Proteins; D011401:Promoter Regions, Genetic; D012333:RNA, Messenger / Q000096:biosynthesis; D012799:Sialyltransferases / Q000096:biosynthesis / Q000235:genetics*; D014157:Transcription Factors / Q000378:metabolism; D015533:Transcriptional Activation; D014407:Tumor Cells, Cultured; D000094802:beta-D-Galactoside alpha 2-6-Sialyltransferase
chemical_list: D004268:DNA-Binding Proteins; C496487:HNF1A protein, human; C496495:HNF1B protein, human; D051538:Hepatocyte Nuclear Factor 1-alpha; D007527:Isoenzymes; D009687:Nuclear Proteins; D012333:RNA, Messenger; D014157:Transcription Factors; D051537:Hepatocyte Nuclear Factor 1; D051539:Hepatocyte Nuclear Factor 1-beta; D012799:Sialyltransferases; D000094802:beta-D-Galactoside alpha 2-6-Sialyltransferase