Hepatoprotective effect of 7-Hydroxycoumarin against Methyl glyoxal toxicity via activation of Nrf2. (1st October 2017)

• Record Type: Journal Article
• Authors: Li, Dan; Wang, Na; Zhang, Jingdong; Ma, Shuren; Zhao, Zhuangzhuang; Ellis, Elizabeth M.
• Is Part Of: Chemico-biological interactions. Volume 276(2017)
• Page Start: 203
• Page End: 209
• Publication Date: 2017-10-01
• Subjects: 7-Hydroxycoumarin -- Methyl glyoxal -- NRF2 -- Chemoprevention -- Hepatotoxicity; ARE antioxidant response element -- AGE advanced glycation end products -- 7-HC 7-hydroxycoumarin -- MG methyl glyoxal -- NRF2 nuclear factor erythroid 2-related factor 2 -- MTT 3-(4, 5-dimethylthiazol-2-yl)-2, 5-diphenyltetrazolium bromide -- NQO1 NAD(P)H:quinone reductases -- G6PDH glucose 6-phosphate dehydrogenase -- GST glutathione S- transferases -- DMSO dimethylsulfoxide -- ROS reactive oxygen species -- DCFH-DA 2′7'-dichlorofluorescein diacetate; Biochemistry -- Periodicals; Toxicological chemistry -- Periodicals; Biochemistry -- Periodicals; Biologie moléculaire -- Périodiques; Biochimie -- Périodiques; Toxicologie biochimique -- Périodiques; 572
• DOI: 10.1016/j.cbi.2017.02.020
• Languages: English
• ISSNs: 0009-2797

Abstract

Abstract: Methyl glyoxal (MG), a major precursor of advanced glycation end-products, has been identified as significant in the progression of several diseases including aging, diabetes and neurodegenerative diseases as well as causing hepatic damages. 7-hydroxycoumarin (7-HC), a natural-occurring derivative of coumarin from fruits and plants, has been reported to exert antioxidant and free radical-scavenging properties, protecting cells from aldehydes and oxidants. In this study, the ability of 7-HC to protect human HepG2 cells against MG-induced toxicity and oxidative stress was investigated. Results show that 7-HC pretreatment significantly attenuates MG-induced cytotoxicity, apoptotic changes and ROS accumulation and that this protection is shown to be associated with the induction of the nuclear factor erythroid 2-related factor 2 (NRF2) and its downstream detoxifying enzymes. In response to 7-HC, NRF2 protein translocates from cytosol to the nuclei. In addition, depletion of NRF2 by siRNA significantly reduces the protective effect of 7-HC against MG, suggesting that NRF2 plays an important role in the protective function of 7-HC. These findings highlight the potential for the interventional activation of the NRF2 induction via the non-toxic natural phytochemical 7-HC as a novel therapeutic approach towards the detoxification of MG, with the aim of halting the progression of diseases in which MG has been implicated. Highlights: 7-hydroxycoumarin treatment protects against methyl glyoxal -induced cytotoxicity, apoptosis and ROS accumulation. AKR7A2, AKR1C3 and AKR7A3 enzymes are inducible by 7-hydroxycoumarin. 7-hydroxycoumarin increases NRF2 nuclear accumulation. NRF2 contributes significantly to the protective effect of 7-HC treatment.