IR@PKUHSC  > 北京大学基础医学院  > 心血管所
学科主题基础医学
Homocysteine downregulates gene expression of heme oxygenase-1 in hepatocytes
Luo, Xiaoqin1,2,3; Xiao, Lei1; Yang, Haixia1,2,3; Zhang, Ruijuan2,3; Jiang, Manli1; Ni, Jiahua1; Lei, Ting1; Wang, Nanping1,4
关键词Homocysteine Reactive oxygen species Heme Oxygenase-1 Nrf2 Bach1
刊名NUTRITION & METABOLISM
2014-12-08
DOI10.1186/1743-7075-11-55
11
收录类别SCI
文章类型Article
WOS标题词Science & Technology
类目[WOS]Nutrition & Dietetics
研究领域[WOS]Nutrition & Dietetics
关键词[WOS]TRANSCRIPTION FACTOR NF-E2 ; LEUCINE-ZIPPER PROTEIN ; OXIDATIVE STRESS ; EPITHELIAL-CELLS ; REPRESSOR BACH1 ; UP-REGULATION ; INDUCTION ; NRF2 ; DISEASE ; MICE
英文摘要

Background: Hyperhomocysteinemia (HHcy) is an independent risk factor for liver diseases, such as fatty liver and hepatic fibrosis. However, the mechanisms underlying this pro-oxidative effect of homocysteine (Hcy) in hepatocytes remain largely unknown. Thus, we investigated the effect of Hcy on the gene expression of heme oxygenase-1 (HO-1), the primary rate-limiting enzyme in heme catabolism and a key anti-oxidant detoxification enzyme in maintaining cellular redox homeostasis.

Methods: In vivo, twenty male C57BL/6 mice at 8 weeks of age were randomly divided into two groups. One group was fed a chow diet (chow group; n = 10), the other group of mice was fed a methionine-supplemented diet (Met group, 1 mg kg(-1) day(-1) L-methionine in drinking water; n = 10) for 4 weeks. In vitro, HepG2 cells were stimulated with different doses of homocysteine (Hcy).

Results: Four weeks′ methionine supplementation caused a significant increase of plasma Hcy concentration and a decrease of HO-1 expression in the liver of C57BL/6 mice than mice received chow diet. Besides, SOD enzyme activities were impaired and the level of oxidative stress markers, such as malondialdehyde (MDA) were elevated in the liver from mice supplemented with methionine compared with control mice. In cultured hepatocytes, Hcy treatment reduced both the mRNA and protein levels of HO-1 dose-dependently. However, Hcy had no effect on the gene expression of Nrf2, the major transcriptional regulator of HO-1. Instead, Hcy induced the expression of Bach1, a transcriptional repressor of HO-1. In addition, Hcy stimulated the nuclear localization of Bach1 but prevented that of Nrf2. Furthermore, we found that knockdown of Bach1 attenuated the suppression of the HO-1 expression by Hcy.

Conclusions: Collectively, our results demonstrated that Bach1 plays an important role in Hcy-triggered ROS generations through inhibiting HO-1 expression, likely, resulting from the disturbed interplay between Bach1 and Nrf2.

语种英语
WOS记录号WOS:000346304600001
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
文献类型期刊论文
条目标识符http://ir.bjmu.edu.cn/handle/400002259/59621
Collection北京大学基础医学院_心血管所
北京大学基础医学院
作者单位1.Xi An Jiao Tong Univ, Cardiovasc Res Ctr, Sch Med, Xian 710061, Peoples R China
2.Xi An Jiao Tong Univ, Sch Med, Dept Publ Hlth, Xian 710061, Peoples R China
3.Xi An Jiao Tong Univ, Nutr & Food Safety Engn Res Ctr Shaanxi Prov, Sch Med, Xian 710061, Peoples R China
4.Peking Univ, Inst Cardiovasc Sci, Beijing 100191, Peoples R China
Recommended Citation
GB/T 7714
Luo, Xiaoqin,Xiao, Lei,Yang, Haixia,et al. Homocysteine downregulates gene expression of heme oxygenase-1 in hepatocytes[J]. NUTRITION & METABOLISM,2014,11.
APA Luo, Xiaoqin.,Xiao, Lei.,Yang, Haixia.,Zhang, Ruijuan.,Jiang, Manli.,...&Wang, Nanping.(2014).Homocysteine downregulates gene expression of heme oxygenase-1 in hepatocytes.NUTRITION & METABOLISM,11.
MLA Luo, Xiaoqin,et al."Homocysteine downregulates gene expression of heme oxygenase-1 in hepatocytes".NUTRITION & METABOLISM 11(2014).
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