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Nutrients 2016, 8(1), 60; doi:10.3390/nu8010060

Effect of Cudrania tricuspidata and Kaempferol in Endoplasmic Reticulum Stress-Induced Inflammation and Hepatic Insulin Resistance in HepG2 Cells

1
Department of Medical Nutrition, Kyung Hee University, Yongin 17104, Korea
2
Division of Food and Nutritional Science, Chonnam National University, Gwangju 61186, Korea
*
Author to whom correspondence should be addressed.
Received: 28 November 2015 / Revised: 11 January 2016 / Accepted: 13 January 2016 / Published: 21 January 2016
(This article belongs to the Special Issue Flavonoids, Inflammation and Immune System)
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Abstract

In this study, we quantitated kaempferol in water extract from Cudrania tricuspidata leaves (CTL) and investigated its effects on endoplasmic reticulum (ER) stress-induced inflammation and insulin resistance in HepG2 cells. The concentration of kaempferol in the CTL was 5.07 ± 0.08 mg/g. The HepG2 cells were treated with 300 µg/mL of CTL, 500 µg/mL of CTL, 1.5 µg/mL of kaempferol or 2.5 µg/mL of kaempferol, followed immediately by stimulation with 100 nM of thapsigargin for ER stress induction for 24 h. There was a marked increase in the activation of the ER stress and inflammation response in the thapsigargin-stimulated control group. The CTL treatment interrupted the ER stress response and ER stress-induced inflammation. Kaempferol partially inhibited the ER stress response and inflammation. There was a significant increase in serine phosphorylation of insulin receptor substrate (IRS)-1 and the expression of C/EBPα and gluconeogenic genes in the thapsigargin-stimulated control group compared to the normal control. Both CTL and kaempferol suppressed serine phosphorylation of IRS-1, and the treatments did not interrupt the C/EBPα/gluconeogenic gene pathway. These results suggest that kaempferol might be the active compound of CTL and that it might protect against ER stress-induced inflammation and hyperglycemia. View Full-Text
Keywords: Cudrania tricuspidata; obesity; insulin resistance; ER stress; inflammation Cudrania tricuspidata; obesity; insulin resistance; ER stress; inflammation
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Kim, O.-K.; Jun, W.; Lee, J. Effect of Cudrania tricuspidata and Kaempferol in Endoplasmic Reticulum Stress-Induced Inflammation and Hepatic Insulin Resistance in HepG2 Cells. Nutrients 2016, 8, 60.

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