Cited by 68Drug Transport and Resistance MechanismsGut microbiota and healthGastrointestinal motility and disorders

Monocarboxylate 4 mediated butyrate transport in a rat intestinal epithelial cell line

Kekuda, Ramesh, Manoharan, Palanikumar, Baseler, Walter, Sundaram, Uma·2013·Digestive Diseases and Sciences

Abstract

Background Short chain fatty acids (SCFA) are absorbed by carrier mediated uptake in the small intestine by pH-dependent SCFA/HCO3 (-) exchangers on the apical membrane of epithelial cells. Conventional assumption is that MCT1 mediates SCFA/HCO3 (-) exchange in the intestine. Further, due to the presence of multiple such anion exchangers, the identity of the intestinal SCFA/HCO3 (-) has been controversial.Aims The aim of this study was to determine the identities of the butyrate transporter in the intestinal epithelial cells (IEC-18).Methods IEC-18 cells were treated with specific siRNAs for MCT1 and MCT4, and butyrate and lactate uptake studies were performed.Results Alpha-cyano-4-hydroxycinnamic acid inhibited lactate uptake but not butyrate uptake in IEC-18 cells, indicating that these two substrates are transported via two different transporter systems. MCT1 siRNA treatment abolished both MCT1 mRNA by more than 95 % and protein expression by 83 % as evidenced by RTQ-PCR and western blotting experiments. However, MCT1 siRNA treatment inhibited butyrate uptake upto 24 %, whereas it inhibited lactate uptake significantly by 70 %. Treatment with MCT4 siRNA inhibited MCT4 mRNA expression by 75 % and protein expression by 85 % in these cells. MCT4 siRNA inhibited butyrate uptake by 40 %. Further, several non-steroidal anti-inflammatory drugs (NSAIDs) are transported by the butyrate transporter. Finally, MCT4 siRNA inhibited salicylate uptake by 27 % indicating direct evidence for the transport of salicylate by MCT4.Conclusions These data indicate that MCT1 is the high affinity lactate transporter and MCT4 is the high affinity butyrate transporter in the intestinal epithelial cell line IEC-18.

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Crossref · 10.1007/s10620-012-2407-x

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  • Abundant expression of monocarboxylate transporters in endothelial cells might facilitate crossing of the blood-brain barrier by short-chain fatty acids, since brain uptake of short-chain fatty acids has been demonstrated in rats following injection of 14C-SCFAs into the carotid artery.

    “The abundant expression of MCTs in endothelial cells (75, 92) might facilitate crossing of the BBB by SCFAs since brain uptake of SCFAs has previously been demonstrated in rats following injection of 14C-SCFAs into the carotid artery (93).”
  • SCFA receptors, mainly free fatty acid receptors and monocarboxylate transporters, have been discovered in the central and peripheral nervous systems, indicating direct signaling potential.

    “Importantly, SCFA receptors, mainly free fatty acid receptors (349) and monocarboxylate transporters (350, 351), have been discovered in the central nervous system (CNS) and peripheral nervous system, indicating direct signaling potential.”

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Authors
Kekuda, R., Manoharan, P., Baseler, W., & Sundaram, U.
Affiliations
West Virginia University (US)
Corresponding author
Sundaram, Uma
Venue
Digestive Diseases and Sciences
Published
2013-01-24
Volume
58
Issue
3
Pages
660-667
ISSN
  • 0163-2116 (ISSN-L)
  • 1573-2568
OpenAlex
W2126122559
Cited by
68
References
27
Citations by year
2026: 4 · 2025: 5 · 2024: 9 · 2023: 5 · 2022: 8 · 2021: 6 · 2020: 7 · 2019: 3 · 2018: 4 · 2017: 1 · 2016: 4 · 2015: 3 · 2014: 6 · 2013: 3
FWCI
2.86
Type
journal article
Language
en
Open access
closed
Locations
  • Digestive Diseases and Sciences (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Institute of Diabetes and Digestive and Kidney Diseases (DK‐067420, R01DK058034, DK-058034, R01DK067420)
Topics
  • Health Sciences › Medicine › Oncology › Drug Transport and Resistance Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Gut microbiota and health
  • Health Sciences › Medicine › Gastroenterology › Gastrointestinal motility and disorders
Keywords
monocarboxylate transporters, MCT1, MCT4, short-chain fatty acids, lactate utilization, IEC-18 cells, intestinal epithelial cells, siRNA knockdown, HCCA
MeSH terms
Monocarboxylate Transport Protein 1, Animals, Anti-Inflammatory Agents, Non-Steroidal, Biological Transport, Butyrates, Cell Line, Epithelial Cells, Hydrogen-Ion Concentration, Intestinal Mucosa, Lactates, Muscle Proteins, RNA, Messenger, Substrate Specificity, Reverse Transcriptase Polymerase Chain Reaction, Salicylic Acid, Monocarboxylic Acid Transporters, Symporters, RNA Interference, Rats

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