Role of Epigallocatechin Gallate in Glucose, Lipid, and Protein Metabolism and L-Theanine in the Metabolism-Regulatory Effects of Epigallocatechin Gallate
Epigallocatechin gallate (EGCG) and L-theanine (LTA) are important bioactive components in tea that have shown promising effects on nutrient metabolism. However, whether EGCG alone or combined with LTA can regulate the glucose, lipid, and protein metabolism of healthy rats remains unclear. Therefore...
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oai:doaj.org-article:6be2476656ba466492488339e07098cb2021-11-25T18:36:54ZRole of Epigallocatechin Gallate in Glucose, Lipid, and Protein Metabolism and L-Theanine in the Metabolism-Regulatory Effects of Epigallocatechin Gallate10.3390/nu131141202072-6643https://doaj.org/article/6be2476656ba466492488339e07098cb2021-11-01T00:00:00Zhttps://www.mdpi.com/2072-6643/13/11/4120https://doaj.org/toc/2072-6643Epigallocatechin gallate (EGCG) and L-theanine (LTA) are important bioactive components in tea that have shown promising effects on nutrient metabolism. However, whether EGCG alone or combined with LTA can regulate the glucose, lipid, and protein metabolism of healthy rats remains unclear. Therefore, we treated healthy rats with EGCG or the combination of EGCG and LTA (EGCG+LTA) to investigate the effects of EGCG on nutrient metabolism and the role of LTA in the metabolism-regulatory effects of EGCG. The results showed that compared with the control group, EGCG activated insulin and AMP-activated protein kinase (AMPK) signals, thus regulating glucose, lipid, and protein metabolism. Compared with EGCG, EGCG+LTA enhanced hepatic and muscle glycogen levels and suppressed phosphorylation of AMPK, glycogen synthase 2, mammalian target of rapamycin, and ribosomal protein S6 kinase. In addition, EGCG+LTA inhibited the expression of liver kinase B1, insulin receptor and insulin receptor substrate, and promoted the phosphorylation level of acetyl-CoA carboxylase. Furthermore, both EGCG and EGCG+LTA were harmless for young rats. In conclusion, EGCG activated AMPK and insulin pathways, thereby promoting glycolysis, glycogen, and protein synthesis and inhibiting fatty acid (FA) and cholesterol synthesis. However, LTA cooperated with EGCG to promote glycogen metabolism and suppressed the effect EGCG on FA and protein synthesis via AMPK signals.Ling LinLi ZengAn LiuDongyin YuanYingqi PengSheng ZhangYinhua LiJinhua ChenWenjun XiaoZhihua GongMDPI AGarticleepigallocatechin gallateL-theanineAMP-activated protein kinase pathwayinsulin pathwaynutrient metabolismNutrition. Foods and food supplyTX341-641ENNutrients, Vol 13, Iss 4120, p 4120 (2021) |
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DOAJ |
| collection |
DOAJ |
| language |
EN |
| topic |
epigallocatechin gallate L-theanine AMP-activated protein kinase pathway insulin pathway nutrient metabolism Nutrition. Foods and food supply TX341-641 |
| spellingShingle |
epigallocatechin gallate L-theanine AMP-activated protein kinase pathway insulin pathway nutrient metabolism Nutrition. Foods and food supply TX341-641 Ling Lin Li Zeng An Liu Dongyin Yuan Yingqi Peng Sheng Zhang Yinhua Li Jinhua Chen Wenjun Xiao Zhihua Gong Role of Epigallocatechin Gallate in Glucose, Lipid, and Protein Metabolism and L-Theanine in the Metabolism-Regulatory Effects of Epigallocatechin Gallate |
| description |
Epigallocatechin gallate (EGCG) and L-theanine (LTA) are important bioactive components in tea that have shown promising effects on nutrient metabolism. However, whether EGCG alone or combined with LTA can regulate the glucose, lipid, and protein metabolism of healthy rats remains unclear. Therefore, we treated healthy rats with EGCG or the combination of EGCG and LTA (EGCG+LTA) to investigate the effects of EGCG on nutrient metabolism and the role of LTA in the metabolism-regulatory effects of EGCG. The results showed that compared with the control group, EGCG activated insulin and AMP-activated protein kinase (AMPK) signals, thus regulating glucose, lipid, and protein metabolism. Compared with EGCG, EGCG+LTA enhanced hepatic and muscle glycogen levels and suppressed phosphorylation of AMPK, glycogen synthase 2, mammalian target of rapamycin, and ribosomal protein S6 kinase. In addition, EGCG+LTA inhibited the expression of liver kinase B1, insulin receptor and insulin receptor substrate, and promoted the phosphorylation level of acetyl-CoA carboxylase. Furthermore, both EGCG and EGCG+LTA were harmless for young rats. In conclusion, EGCG activated AMPK and insulin pathways, thereby promoting glycolysis, glycogen, and protein synthesis and inhibiting fatty acid (FA) and cholesterol synthesis. However, LTA cooperated with EGCG to promote glycogen metabolism and suppressed the effect EGCG on FA and protein synthesis via AMPK signals. |
| format |
article |
| author |
Ling Lin Li Zeng An Liu Dongyin Yuan Yingqi Peng Sheng Zhang Yinhua Li Jinhua Chen Wenjun Xiao Zhihua Gong |
| author_facet |
Ling Lin Li Zeng An Liu Dongyin Yuan Yingqi Peng Sheng Zhang Yinhua Li Jinhua Chen Wenjun Xiao Zhihua Gong |
| author_sort |
Ling Lin |
| title |
Role of Epigallocatechin Gallate in Glucose, Lipid, and Protein Metabolism and L-Theanine in the Metabolism-Regulatory Effects of Epigallocatechin Gallate |
| title_short |
Role of Epigallocatechin Gallate in Glucose, Lipid, and Protein Metabolism and L-Theanine in the Metabolism-Regulatory Effects of Epigallocatechin Gallate |
| title_full |
Role of Epigallocatechin Gallate in Glucose, Lipid, and Protein Metabolism and L-Theanine in the Metabolism-Regulatory Effects of Epigallocatechin Gallate |
| title_fullStr |
Role of Epigallocatechin Gallate in Glucose, Lipid, and Protein Metabolism and L-Theanine in the Metabolism-Regulatory Effects of Epigallocatechin Gallate |
| title_full_unstemmed |
Role of Epigallocatechin Gallate in Glucose, Lipid, and Protein Metabolism and L-Theanine in the Metabolism-Regulatory Effects of Epigallocatechin Gallate |
| title_sort |
role of epigallocatechin gallate in glucose, lipid, and protein metabolism and l-theanine in the metabolism-regulatory effects of epigallocatechin gallate |
| publisher |
MDPI AG |
| publishDate |
2021 |
| url |
https://doaj.org/article/6be2476656ba466492488339e07098cb |
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