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- W2079231659 abstract "We previously showed that unsaturated fatty acids induced gene expression of cellular retinol-binding protein type II (CRBPII) in rat jejunum [Suruga, K., Suzuki, R., Goda, T. and Takase, S. (1995) J. Nutr. 125, 2039-2044]. In the present study, we investigated this induction mechanism(s) using the human intestinal Caco-2 cell line. The postconfluent mature Caco-2 cells were maintained in serum-free medium containing arachidonic acid or its analogue, 5,8,11, 14-eicosatetraynoic acid (ETYA). Northern blot analysis showed that these compounds induced CRBPII mRNA levels to rise and that this induction was more effective when combined with 9-cis retinoic acid. This effect was independent of cycloheximide and inhibited by actinomycin D. Nuclear run-on assays confirmed that the ETYA and 9-cis retinoic acid-induced increase of CRBPII mRNA levels was due to an increased rate of transcription of its gene. In Caco-2 cells, the transcripts of peroxisome proliferator-activated receptor alpha (PPARalpha) and retinoid X receptor alpha (RXRalpha), which were activated by their ligands ETYA and 9-cis retinoic acid, respectively, were coexpressed. The gel shift study using rat CRBPII gene nuclear receptor response elements (RXRE, RE2, RE3) revealed that several forms of nuclear proteins from Caco-2 cells specifically bound to these elements. Some of these protein/DNA complexes reacted to both anti-RXRalpha and anti-PPAR antibodies. In addition, in-vitro synthesized RXRalpha and PPARalpha cooperatively bound to these elements as a heterodimer and these binding activities were enhanced by addition of ETYA or arachidonic acid but not by addition of 9-cis retinoic acid. These studies suggest that fatty acid or its analogue may regulate CRBPII gene expression through PPAR/RXR heterodimer bound to the nuclear receptor response element(s) of the CRBPII genes." @default.
- W2079231659 created "2016-06-24" @default.
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- W2079231659 date "1999-01-01" @default.
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- W2079231659 title "Regulation of cellular retinol-binding protein type II gene expression by arachidonic acid analogue and 9-cis retinoic acid in Caco-2 cells" @default.
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- W2079231659 doi "https://doi.org/10.1046/j.1432-1327.1999.00330.x" @default.
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