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Cited by 353

The DOI matches its Crossref record; 2 of the 2 references it cites were found in a registry or an index.

Identification of a Bile Acid-responsive Element in the Human Ileal Bile Acid-binding Protein Gene

Open access
Grober, Jacques, Zaghini, Isabelle, Fujii, Hiroshi, Jones, Stacey A., Kliewer, Steven A., Willson, Timothy M., Ono, Teruo, Besnard, Philippe·1999·Journal of Biological Chemistry

Abstract

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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