Abstract
Taurine (2-aminoethanesulfonic acid), a sulfur-containing β-amino acid, is a free amino acid present in high concentrations in mammalian tissues. Taurine has pivotal roles in anti-oxidation, membrane stabilization, osmoregulation, anti-inflammation, and other process. In a DNA microarray analysis, we previously found that taurine markedly increases the mRNA expression of thioredoxin interacting protein (TXNIP) in Caco-2 cells. In this study, we investigated the effect of these taurine-induced changes in TXNIP on the function of Caco-2 cells. We found that taurine decreases glucose uptake in a dose-dependent manner. The taurine-induced decrease in glucose uptake was completely abolished by transfection with siRNA against TXNIP, suggesting that TXNIP is involved in the taurine-induced down-regulation of glucose uptake. We also revealed that taurine induces AMPK activation and further increases the intracellular ATP content in Caco-2 cells. These results suggest that taurine could regulate the function of Caco-2 cells via TXNIP induction, leading to extend our understanding of the functions of taurine.
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Abbreviations
- TXNIP :
-
thioredoxin interacting protein
- AMP :
-
adenosine monophosphate
- AMPK :
-
adenosine monophosphate kinase
- ATP :
-
adenosine triphosphate
- GLUT1 :
-
glucose transporter 1
- GLUT3 :
-
glucose transporter 3
- ChoRE :
-
carbohydrate response element
- ChREBP :
-
carbohydrate response element binding protein
- mTOR :
-
mammalian target of rapamycin
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Satsu, H., Gondo, Y., Shimanaka, H., Watari, K., Fukumura, M., Shimizu, M. (2019). Effect of Taurine on Cell Function via TXNIP Induction in Caco-2 Cells. In: Hu, J., Piao, F., Schaffer, S., El Idrissi, A., Wu, JY. (eds) Taurine 11. Advances in Experimental Medicine and Biology, vol 1155. Springer, Singapore. https://doi.org/10.1007/978-981-13-8023-5_15
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DOI: https://doi.org/10.1007/978-981-13-8023-5_15
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