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Short‐Chain Fatty Acid Transporters: Role in Colonic Homeostasis

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ABSTRACT

Short‐chain fatty acids (SCFA; acetate, propionate, and butyrate) are generated in colon by bacterial fermentation of dietary fiber. Though diffusion in protonated form is a significant route, carrier‐mediated mechanisms constitute the major route for the entry of SCFA in their anionic form into colonic epithelium. Several transport systems operate in cellular uptake of SCFA. MCT1 (SLC16A1) and MCT4 (SLC16A3) are H+‐coupled and mediate electroneutral transport of SCFA (H+: SCFA stoichiometry; 1:1). MCT1 is expressed both in the apical membrane and basolateral membrane of colonic epithelium whereas MCT4 specifically in the basolateral membrane. SMCT1 (SLC5A8) and SMCT2 (SLC5A12) are Na+‐coupled; SMCT1‐mediated transport is electrogenic (Na+: SCFA stoichiometry; 2:1) whereas SMCT2‐mediated transport is electroneutral (Na+: SCFA stoichiometry; 1:1). SMCT1 and SMCT2 are expressed exclusively in the apical membrane. An anion‐exchange mechanism also operates in the apical membrane in which SCFA entry in anionic form is coupled to bicarbonate efflux; the molecular identity of this exchanger however remains unknown. All these transporters are subject to regulation, notably by their substrates themselves; this process involves cell‐surface receptors with SCFA as signaling molecules. There are significant alterations in the expression of these transporters in ulcerative colitis and colon cancer. The tumor‐associated changes occur via transcriptional regulation by p53 and HIF1α and by promoter methylation. As SCFA are obligatory for optimal colonic health, the transporters responsible for the entry and transcellular transfer of these bacterial products in colonic epithelium are critical determinants of colonic function under physiological conditions and in disease states. © 2018 American Physiological Society. Compr Physiol 8:299‐314, 2018.

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Figure 1. Figure 1. Relationship between MCT1 (SLC16A1) mRNA expression levels in tumor tissues and overall survival of patients with cancer of colon and rectum. (A) Cancers of colon and rectum combined; (B) cancer of colon; and (C) cancer of rectum. OS, overall survival. In patients with rectal cancer, higher expression of SLC16A1 correlates significantly with improved overall survival. The trend, but not statistically significant, of positive correlation between SLC16A1 expression levels and overall survival is observed when data for patients with colon cancer and rectal cancer are combined. When data for patients with colon cancer are analyzed separately, there is no significant correlation between SLC16A1 expression levels and overall survival.
Figure 2. Figure 2. Relationship between SMCT1 (SLC5A8) mRNA expression levels in tumor tissues and overall survival of patients with cancer of colon and rectum. (A) Cancers of colon and rectum combined; (B) cancer of colon; and (C) cancer of rectum. OS, overall survival. There is no statistically significant correlation between SLC5A8 mRNA levels in tumor tissues and overall survival of the patients. There is a weak correlation between the two parameters when data for colon cancer alone are analyzed, but this correlation seems to indicate that higher expression of SLC5A8 is associated with lower overall survival, a trend that goes against the tumor‐suppressive function of SLC5A8.
Figure 3. Figure 3. Polarized expression of short‐chain fatty acid transporters in colonic epithelium. SCFA, short‐chain fatty acids; MCT1, monocarboxylate transporter 1 (SLC16A1); MCT4, monocarboxylate transporter 4 (SLC16A3); SMCT1, sodium‐coupled monocarboxylate transporter 1 (SLC5A8); ABCG2, ATP binding cassette transporter, gene family G, member 2. CD147 is the chaperone (ancillary protein) for MCT1 and MCT4.


Figure 1. Relationship between MCT1 (SLC16A1) mRNA expression levels in tumor tissues and overall survival of patients with cancer of colon and rectum. (A) Cancers of colon and rectum combined; (B) cancer of colon; and (C) cancer of rectum. OS, overall survival. In patients with rectal cancer, higher expression of SLC16A1 correlates significantly with improved overall survival. The trend, but not statistically significant, of positive correlation between SLC16A1 expression levels and overall survival is observed when data for patients with colon cancer and rectal cancer are combined. When data for patients with colon cancer are analyzed separately, there is no significant correlation between SLC16A1 expression levels and overall survival.


Figure 2. Relationship between SMCT1 (SLC5A8) mRNA expression levels in tumor tissues and overall survival of patients with cancer of colon and rectum. (A) Cancers of colon and rectum combined; (B) cancer of colon; and (C) cancer of rectum. OS, overall survival. There is no statistically significant correlation between SLC5A8 mRNA levels in tumor tissues and overall survival of the patients. There is a weak correlation between the two parameters when data for colon cancer alone are analyzed, but this correlation seems to indicate that higher expression of SLC5A8 is associated with lower overall survival, a trend that goes against the tumor‐suppressive function of SLC5A8.


Figure 3. Polarized expression of short‐chain fatty acid transporters in colonic epithelium. SCFA, short‐chain fatty acids; MCT1, monocarboxylate transporter 1 (SLC16A1); MCT4, monocarboxylate transporter 4 (SLC16A3); SMCT1, sodium‐coupled monocarboxylate transporter 1 (SLC5A8); ABCG2, ATP binding cassette transporter, gene family G, member 2. CD147 is the chaperone (ancillary protein) for MCT1 and MCT4.
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Teaching Material

S. Sivaprakasam, Y. D. Bhutia, S. Yang, V. Ganapathy. Short-Chain Fatty Acid Transporters: Role in Colonic Homeostasis. Compr Physiol. 8: 2018, 299-314.

Didactic Synopsis

Major Teaching Points:

  • Fermentation of dietary fiber by colonic bacteria yields short-chain fatty acids (SCFA)
  • SCFA elicit beneficial effects on colon via extracellular and intracellular actions
  • Extracellular actions of SCFA occur via receptors in apical membrane of colonic epithelium
  • Intracellular actions of SCFA in colonic epithelium involve inhibition of histone deacetylases (HDACs), generation of energy, and conversion into ketone bodies
  • Entry of SCFA into colonic epithelium is mostly carrier-mediated
  • MCT1 and MCT4 are H+-coupled transporters expressed in apical membrane (MCT1) and basolateral membrane (MCT1 and MCT4) of colonic epithelium, mediating SCFA influx from lumen and SCFA efflux into blood
  • SMCT1 and SMCT2 are Na+-coupled transporters expressed solely in apical membrane of colonic epithelium, mediating SCFA influx from lumen
  • SCFA transporters are defective in ulcerative colitis
  • MCT1 and SMCT1 function as tumor suppressors in colon and are downregulated in colon cancer
  • The tumor-suppressive function of MCT1 and SMCT1 might be related to dietary fiber content

Didactic Legends

The figures—in a freely downloadable PowerPoint format—can be found on the Images tab along with the formal legends published in the article. The following legends to the same figures are written to be useful for teaching.Figure 1–Figure 3

Figure 1. Teaching points: Cancer patients are stratified into two groups, low expressors of SLC16A1 and high expressors of SLC16A1, and the patients’ overall survival is plotted for the two groups. In patients with rectal cancer, there is a significant correlation between overall survival and the low or high expression of SLC16A1; high expressors show a better overall survival compared to low expressors. This correlation could be due to increased exposure of cancer cells in high expressors to luminal SCFA, which are tumor-suppressive. This significance is not seen in patients with colon cancer or when the data are combined for colon cancer patients and rectal cancer patients.

Figure 2. Teaching points: Cancer patients are stratified into two groups, low expressors of SLC5A8 and high expressors of SLC5A8, and the patients’ overall survival is plotted for the two groups. There is no significant correlation between the overall survival and the expression levels of SLC5A8 in patients with rectal cancer or when the data are combined for colon cancer patients and rectal cancer patients. There appears to be a significant correlation between the overall survival and the expression levels of SLC5A8 in patients with colon cancer. High expressors show less overall survival compared with low expressors. This correlation is opposite of what is expected for a tumor suppressor. We might need additional information on these patients such as dietary intake of fiber before making any conclusions based on the data.

Figure 3. Teaching points: The polarized distribution of the butyrate transporters is depicted in this figure. The H+-coupled transporter MCT1, the Na+-coupled transporter SMCT1, and the ATP-dependent exporter ABCG2 are expressed on the lumen-facing apical membrane of colonic epithelial cells. In contrast, MCT1 and MCT4, both are H+-coupled transporters, are expressed in the basolateral membrane of colonic epithelial cells. CD147 is a protein that has no transport function, but serves as a chaperone for MCT1 and MCT4; CD147 binds to the two transporters and facilitate their recruitment to the plasma membrane.

 


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How to Cite

Sathish Sivaprakasam, Yangzom D. Bhutia, Shengping Yang, Vadivel Ganapathy. Short‐Chain Fatty Acid Transporters: Role in Colonic Homeostasis. Compr Physiol 2017, 8: 299-314. doi: 10.1002/cphy.c170014