Inhibition of butyrate uptake by the primary bile salt chenodeoxycholic acid in intestinal epithelial cells.

Abstract:

:Colorectal cancer (CRC) is one of the most common cancers worldwide. Epidemiological and experimental studies suggest that bile acids may play a role in CRC etiology. Our aim was to characterize the effect of the primary bile acid chenodeoxycholic acid (CDCA) upon(14) C-BT uptake in tumoral (Caco-2) and non-tumoral (IEC-6) intestinal epithelial cell lines. A 2-day exposure to CDCA markedly and concentration-dependently inhibited (14) C-BT uptake by IEC-6 cells (IC(50) = 120 µM), and, less potently, by Caco-2 cells (IC(50) = 402 µM). The inhibitory effect of CDCA upon (14) C-BT uptake did not result from a decrease in cell proliferation or viability. In IEC-6 cells: (1) uptake of (14) C-BT involves both a high-affinity and a low-affinity transporter, and CDCA acted as a competitive inhibitor of the high-affinity transporter; (2) CDCA inhibited both Na(+)-coupled monocarboxylate cotransporter 1 (SMCT1)- and H(+)-coupled monocarboxylate transporter 1 (MCT1)-mediated uptake of (14) C-BT; (3) CDCA significantly increased the mRNA expression level of SMCT1; (4) inhibition of (14) C-BT uptake by CDCA was dependent on CaM, MAP kinase (ERK1/2 and p38 pathways), and PKC activation, and reduced by a reactive oxygen species scavenger. Finally, BT (5 mM) decreased IEC-6 cell viability and increased IEC-6 cell differentiation, and CDCA (100 µM) reduced this effect. In conclusion, CDCA is an effective inhibitor of (14) C-BT uptake in tumoral and non-tumoral intestinal epithelial cells, through inhibition of both H(+) -coupled MCT1- and SMCT1-mediated transport. Given the role played by BT in the intestine, this mechanism may contribute to the procarcinogenic effect of CDCA at this level.

journal_name

J Cell Biochem

authors

Gonçalves P,Catarino T,Gregório I,Martel F

doi

10.1002/jcb.24172

subject

Has Abstract

pub_date

2012-09-01 00:00:00

pages

2937-47

issue

9

eissn

0730-2312

issn

1097-4644

journal_volume

113

pub_type

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