PMID- 29371754 OWN - NLM STAT- PubMed-not-MEDLINE LR - 20200930 IS - 0912-0009 (Print) IS - 1880-5086 (Electronic) IS - 0912-0009 (Linking) VI - 62 IP - 1 DP - 2018 Jan TI - Glutathione homeostasis is significantly altered by quercetin via the Keap1/Nrf2 and MAPK signaling pathways in rats. PG - 56-62 LID - 10.3164/jcbn.17-40 [doi] AB - Previously, we showed that 0.5% quercetin simultaneously decreased serum homocysteine and glutathione (GSH) levels in rats. The aim of the present study was to investigate the effects of 0.5% quercetin on GSH metabolism, related enzymes and signal pathways in rats. Rats were fed the control diet and 0.5% quercetin-supplemented diet for 6 weeks. The results showed that quercetin reduced serum and hepatic content of GSH and the ratio of GSH and oxidized glutathione (GSSG), enhanced hepatic activity and mRNA expression of glutathione S-transferase (GST), inhibited hepatic activity and mRNA expression of glutamate cysteine ligase (GCL), and decreased hepatic glutathione reductase (GR) mRNA expression. Levels of phosphorylated p38 and extracellular signal-regulated kinase (ERK) 1/2 mitogen-activated protein kinases (MAPKs) increased, while that of nuclear factor E2-like 2 (Nrf2) protein decreased after quercetin treatment. However, no significant hepatotoxicity was noted. We concluded that quercetin treatment altered hepatic GSH metabolism by modulating GSH metabolic enzyme activities and mRNA expression in rats, and p38, ERK1/2 MAPKs, and Nrf2 were involved in modulating GSH metabolism-related enzymes. FAU - Gao, Weina AU - Gao W AD - Tianjin Institute of Health and Environmental Medicine, NO.1 Dali Road, Tianjin 300050, P. R. China. FAU - Pu, Lingling AU - Pu L AD - Tianjin Institute of Health and Environmental Medicine, NO.1 Dali Road, Tianjin 300050, P. R. China. FAU - Chen, Ming AU - Chen M AD - The People's Hospital of Lichuan, Jiangxi Province, 344600, P. R. China. FAU - Wei, Jingyu AU - Wei J AD - Tianjin Institute of Health and Environmental Medicine, NO.1 Dali Road, Tianjin 300050, P. R. China. FAU - Xin, Zhonghao AU - Xin Z AD - Tianjin Institute of Health and Environmental Medicine, NO.1 Dali Road, Tianjin 300050, P. R. China. FAU - Wang, Yawen AU - Wang Y AD - Tianjin Institute of Health and Environmental Medicine, NO.1 Dali Road, Tianjin 300050, P. R. China. FAU - Yao, Zhanxin AU - Yao Z AD - Tianjin Institute of Health and Environmental Medicine, NO.1 Dali Road, Tianjin 300050, P. R. China. FAU - Shi, Tala AU - Shi T AD - Tianjin Institute of Health and Environmental Medicine, NO.1 Dali Road, Tianjin 300050, P. R. China. FAU - Guo, Changjiang AU - Guo C AD - Tianjin Institute of Health and Environmental Medicine, NO.1 Dali Road, Tianjin 300050, P. R. China. LA - eng PT - Journal Article DEP - 20171212 PL - Japan TA - J Clin Biochem Nutr JT - Journal of clinical biochemistry and nutrition JID - 8700907 PMC - PMC5773830 OTO - NOTNLM OT - MAPKs OT - Nrf2 OT - glutamate cysteine ligase OT - glutathione OT - quercetin COIS- No potential conflicts of interest were disclosed. EDAT- 2018/01/27 06:00 MHDA- 2018/01/27 06:01 PMCR- 2018/01/01 CRDT- 2018/01/27 06:00 PHST- 2017/04/25 00:00 [received] PHST- 2017/09/08 00:00 [accepted] PHST- 2018/01/27 06:00 [entrez] PHST- 2018/01/27 06:00 [pubmed] PHST- 2018/01/27 06:01 [medline] PHST- 2018/01/01 00:00 [pmc-release] AID - jcbn17-40 [pii] AID - 10.3164/jcbn.17-40 [doi] PST - ppublish SO - J Clin Biochem Nutr. 2018 Jan;62(1):56-62. doi: 10.3164/jcbn.17-40. Epub 2017 Dec 12.