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Role of Epigallocatechin Gallate in Glucose, Lipid, and Protein Metabolism and L-Theanine in the Metabolism-Regulatory Effects of Epigallocatechin Gallate.
- Source :
-
Nutrients [Nutrients] 2021 Nov 17; Vol. 13 (11). Date of Electronic Publication: 2021 Nov 17. - Publication Year :
- 2021
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Abstract
- 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.
- Subjects :
- AMP-Activated Protein Kinase Kinases metabolism
AMP-Activated Protein Kinases metabolism
Acetyl-CoA Carboxylase metabolism
Animals
Catechin pharmacology
Drug Interactions
Glycogen metabolism
Glycogen Synthase metabolism
Insulin metabolism
Liver drug effects
Liver metabolism
Male
Muscles drug effects
Muscles metabolism
Phosphorylation
Rats, Sprague-Dawley
Receptor, Insulin metabolism
Ribosomal Protein S6 Kinases metabolism
TOR Serine-Threonine Kinases metabolism
Tea chemistry
Rats
Camellia sinensis chemistry
Catechin analogs & derivatives
Glucose metabolism
Glutamates pharmacology
Lipid Metabolism drug effects
Plant Extracts pharmacology
Proteins metabolism
Subjects
Details
- Language :
- English
- ISSN :
- 2072-6643
- Volume :
- 13
- Issue :
- 11
- Database :
- MEDLINE
- Journal :
- Nutrients
- Publication Type :
- Academic Journal
- Accession number :
- 34836374
- Full Text :
- https://doi.org/10.3390/nu13114120