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• W1479892163 abstract "The arrangement of regulatory elements along the apolipoprotein B promoter region (positions -898 to +1) has been examined in transient transfection experiments performed in HepG2 and Hep3B (hepatic) and CaCo-2 (intestinal) cell lines, all of which express the apoB gene, and also in Chinese hamster ovary cells, which do not express the gene. The overall distribution of positive and negative regulatory segments was very similar in the two hepatoma cell lines (HepG2 and Hep3B) but different from that observed in the colon carcinoma cells (CaCo-2). Thus, whereas 260 base pairs of 5'-flanking sequence were sufficient for maximal expression of the promoter in HepG2 cells, only 139 nucleotides were required for maximal expression in CaCo-2 cells. Promoter activity in Chinese hamster ovary cells was exhibited by short constructs, with maximal activity for the -85 construct. DNase I footprinting of the apolipoprotein B promoter region using hepatic and intestinal extracts revealed multiple sites of interaction between the DNA and nuclear proteins. Gel retention experiments using the region from -262 to -88 (the region of greatest contrast between HepG2 and CaCo-2 cells) revealed interesting variations in the relative abundance of various nuclear proteins between the two cell types. A major functional difference between HepG2 and CaCo-2 cells was localized to the region between -111 and -88, which harbors the sequence TGTTTGCT, a motif present in the promoter region of several liver-specific genes. The molecular basis for the functional differences between these two cell types may be attributable to a difference in the relative abundance of three proteins that bind to sequences between -111 and -88." @default.
• W1479892163 created "2016-06-24" @default.
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• W1479892163 date "1991-12-01" @default.
• W1479892163 modified "2023-09-30" @default.
• W1479892163 title "Similarities and differences in the function of regulatory elements at the 5' end of the human apolipoprotein B gene in cultured hepatoma (HepG2) and colon carcinoma (CaCo-2) cells." @default.
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• W1479892163 doi "https://doi.org/10.1016/s0021-9258(18)54406-9" @default.
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