Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8548623 | Food and Chemical Toxicology | 2017 | 8 Pages |
Abstract
A-type dimeric epigallocatechin-3-gallate (A-type-EGCG-dimer, AEd), a new proanthocyanidins dimer from persimmon fruits, has been shown to have health benefit effects. However, A-type-EGCG-dimer affects gluose metabolism in the liver and the underlying mechanism is not clarified. The present study aims to examine the protective effects of A-type-EGCG-dimer on Pb-induced hepatic insulin resistance, endoplasmic reticulum (ER) stress and apoptosis in rats. Male wistar rats exposed to 0.05% w/v Pb acetate in the drinking water with or without A-type-EGCG-dimer coadministration (200Â mg/kg body weight/day, intragastrically) for three months. We found that A-type-EGCG-dimer and pioglitazone supplementation significantly deceased glucose and insulin levels in plasma as compared with the Pb group. A-type-EGCG-dimer markedly prevents Pb-induced oxidative stress, ER stress and apoptosis in livers. A-type-EGCG-dimer and pioglitazone reduced the expression levels of the GRP78, PEPCK, G6Pase, p-PERK, p-IRE1, p-JNK, ATF4, CHOP and increased p-AKT in livers of the Pb group. Moreover, A-type-EGCG-dimer reduced ROS production and restored the activities of SOD and GPx in livers. A-type-EGCG-dimer decreased Bax, cytosolic cytochrome c and cleaved caspase-3 and increased Bcl-2 in livers of Pb-exposed rats. Our results suggest that A-type-EGCG-dimer might be a potential natural candidate for the prevention of hepatic insulin resistance and apoptosis induced by Pb.
Keywords
Epigallocatechin-3-gallateprotein kinase RNA (PKR)-like ER kinaseA-type EGCG dimerPhosphorylated protein kinase BG6PaseGRP78PEPCKIRE1GPXEGCGAEDJnkC/EBP homologous proteinc-Jun N-terminal kinaseROSinositol-requiring enzyme 1AktER stressCHOPApoptosisSODLeadSuperoxide dismutasephosphoenolpyruvate carboxykinaseInsulin resistanceglucose-regulated protein 78PERKLiverglutathione peroxidaseReactive oxygen species
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Authors
Chan-Min Liu, Jie-Qiong Ma, Jian-Mei Sun, Zhao-Jun Feng, Chao Cheng, Wei Yang, Hong Jiang,