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Identification of a Bile Acid-responsive Element in the Human Ileal Bile Acid-binding Protein Gene
Open accessAbstract
Intestinal bile acid-binding protein (I-BABP) is a cytosolic protein that binds bile acids (BAs) with a high affinity. In the small intestine, its expression is restricted to the ileum where it is involved in the enterohepatic circulation of BAs. Using the human enterocyte-like Caco-2 cell line, we have recently shown that BAs increased I-BABP gene expression. To determine whether this regulation occurs in vivo, the effect of BA depletion or supplementation was studied in mice. A dramatic drop in I-BABP mRNA levels was observed in mice treated with the BA-binding resin cholestyramine, whereas an increase was found in animals fed with taurocholic acid. BAs are physiological ligands for the nuclear farnesoid X receptor (FXR). Both FXR and I-BABP are co-expressed along the small intestine and in Caco-2 cells. To determine the role of FXR in the regulation of I-BABP expression, the promoter of the human I-BABP gene was cloned. In Caco-2 cells, cotransfection of FXR and RXRalpha is required to obtain the full transactivation of the I-BABP promoter by BAs. Deletion and mutation analyses demonstrate that the FXR/RXRalpha heterodimer activates transcription through an inverted repeat bile acid responsive element located in position -160/-148 of the human I-BABP promoter. In conclusion, we show that FXR is a physiological BA sensor that is likely to play an essential role in BA homeostasis through the regulation of genes involved in their enterohepatic circulation.
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Metadata
- Authors
- Grober, J., Zaghini, I., Fujii, H., Jones, S. A., Kliewer, S. A., Willson, T. M., Ono, T., & Besnard, P.
- Venue
- Journal of Biological Chemistry
- Publisher
- Elsevier BV
- Published
- 1999-10
- Volume
- 274
- Issue
- 42
- Pages
- 29749-29754
- ISSN
- 0021-9258 (ISSN-L)
- OpenAlex
- W2054462517
- Cited by
- 353
- References
- 2
- FWCI
- 8.50
- Type
- journal article
- Language
- en
- Open access
- hybrid
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