The Journal of Membrane Biology

, Volume 240, Issue 1, pp 35–46 | Cite as

Characterization of Butyrate Uptake by Nontransformed Intestinal Epithelial Cell Lines

  • Pedro Gonçalves
  • João R. Araújo
  • Fátima Martel
Article

Abstract

Butyrate (BT) is one of the main end products of anaerobic bacterial fermentation of dietary fiber within the human colon. Among its recognized effects, BT inhibits colon carcinogenesis. Our aim was to characterize uptake of BT by two nontransformed intestinal epithelial cell lines: rat small intestinal epithelial (IEC-6) and fetal human colonic epithelial (FHC) cells. Uptake of 14C-BT by IEC-6 cells was (1) time- and concentration-dependent; (2) pH-dependent; (3) Na+-, Cl- and energy-dependent; (4) inhibited by BT structural analogues; (5) sensitive to monocarboxylate transporter 1 (MCT1) inhibitors; and (6) insensitive to DIDS and amiloride. IEC-6 cells express both MCT1 and Na+-coupled monocarboxylate transporter 1 (SMCT1) mRNA. We conclude that 14C-BT uptake by IEC-6 cells mainly involves MCT1, with a small contribution of SMCT1. Acute exposure to ethanol, acetaldehyde, indomethacin, resveratrol and quercetin reduced 14C-BT uptake. Chronic exposure to resveratrol and quercetin reduced 14C-BT uptake but had no effect on either MCT1 or SMCT1 mRNA levels. Uptake of 14C-BT by FHC cells was time- and concentration-dependent but pH-, Na+-, Cl- and energy-independent and insensitive to BT structural analogues and MCT1 inhibitors. Although MCT1 (but not SMCT1) mRNA expression was found in FHC cells, the characteristics of 14C-BT uptake by FHC cells did not support either MCT1 or SMCT1 involvement. In conclusion, uptake characteristics of 14C-BT differ between IEC-6 and FHC cells. IEC-6 cells demonstrate MCT1- and SMCT1-mediated transport, while FHC cells do not.

Keywords

Butyrate uptake Nontransformed intestinal epithelial cell Monocarboxylate transporter type 1 Xenobiotics 

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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • Pedro Gonçalves
    • 1
  • João R. Araújo
    • 1
  • Fátima Martel
    • 1
  1. 1.Department of Biochemistry (U38-FCT), Faculty of MedicineUniversity of PortoPortoPortugal

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