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Xie L, Xu Y, Ding X, Li K, Liang S, Li D, Wang Y, Fu A, Yu W, Zhan X. Selenomethionine Attenuated H 2O 2-Induced Oxidative Stress and Apoptosis by Nrf2 in Chicken Liver Cells. Antioxidants (Basel) 2023; 12:1685. [PMID: 37759988 PMCID: PMC10525281 DOI: 10.3390/antiox12091685] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2023] [Revised: 08/26/2023] [Accepted: 08/26/2023] [Indexed: 09/29/2023] Open
Abstract
Earlier studies have shown that selenomethionine (SM) supplements in broiler breeders had higher deposition in eggs, further reduced the mortality of chicken embryos, and exerted a stronger antioxidant ability in offspring than sodium selenite (SS). Since previous studies also confirmed that Se deposition in eggs was positively correlated with maternal supplementation, this study aimed to directly investigate the antioxidant activities and underlying mechanisms of SS and SM on the chicken hepatocellular carcinoma cell line (LMH). The cytotoxicity results showed that the safe concentration of SM was up to 1000 ng/mL, while SS was 100 ng/mL. In Se treatments, both SS and SM significantly elevated mRNA stability and the protein synthesis rate of glutathione peroxidase (GPx) and thioredoxin reductase (TrxR), two Se-containing antioxidant enzymes. Furthermore, SM exerted protective effects in the H2O2-induced oxidant stress model by reducing free radicals (including ROS, MDA, and NO) and elevating the activities of antioxidative enzymes, which performed better than SS. Furthermore, the results showed that cotreatment with SM significantly induced apoptosis induced by H2O2 on elevating the content of Bcl-2 and decreasing caspase-3. Moreover, investigations of the mechanism revealed that SM might exert antioxidant effects on H2O2-induced LMHs by activating the Nrf2 pathway and enhancing the activities of major antioxidant selenoenzymes downstream. These findings provide evidence for the effectiveness of SM on ameliorating H2O2-induced oxidative impairment and suggest SM has the potential to be used in the prevention or adjuvant treatment of oxidative-related impairment in poultry feeds.
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Affiliation(s)
- Lingyu Xie
- Ministry of Agriculture and Key Laboratory of Animal Feed and Nutrition of Zhejiang Province, Key Laboratory of Animal Nutrition and Feed in East China, Feed Science Institute, College of Animal Science, Zhejiang University, Hangzhou 310058, China; (L.X.); (Y.X.); (X.D.); (K.L.); (S.L.); (D.L.); (A.F.)
| | - Yibin Xu
- Ministry of Agriculture and Key Laboratory of Animal Feed and Nutrition of Zhejiang Province, Key Laboratory of Animal Nutrition and Feed in East China, Feed Science Institute, College of Animal Science, Zhejiang University, Hangzhou 310058, China; (L.X.); (Y.X.); (X.D.); (K.L.); (S.L.); (D.L.); (A.F.)
| | - Xiaoqing Ding
- Ministry of Agriculture and Key Laboratory of Animal Feed and Nutrition of Zhejiang Province, Key Laboratory of Animal Nutrition and Feed in East China, Feed Science Institute, College of Animal Science, Zhejiang University, Hangzhou 310058, China; (L.X.); (Y.X.); (X.D.); (K.L.); (S.L.); (D.L.); (A.F.)
| | - Kaixuan Li
- Ministry of Agriculture and Key Laboratory of Animal Feed and Nutrition of Zhejiang Province, Key Laboratory of Animal Nutrition and Feed in East China, Feed Science Institute, College of Animal Science, Zhejiang University, Hangzhou 310058, China; (L.X.); (Y.X.); (X.D.); (K.L.); (S.L.); (D.L.); (A.F.)
| | - Shuang Liang
- Ministry of Agriculture and Key Laboratory of Animal Feed and Nutrition of Zhejiang Province, Key Laboratory of Animal Nutrition and Feed in East China, Feed Science Institute, College of Animal Science, Zhejiang University, Hangzhou 310058, China; (L.X.); (Y.X.); (X.D.); (K.L.); (S.L.); (D.L.); (A.F.)
| | - Danlei Li
- Ministry of Agriculture and Key Laboratory of Animal Feed and Nutrition of Zhejiang Province, Key Laboratory of Animal Nutrition and Feed in East China, Feed Science Institute, College of Animal Science, Zhejiang University, Hangzhou 310058, China; (L.X.); (Y.X.); (X.D.); (K.L.); (S.L.); (D.L.); (A.F.)
| | - Yongxia Wang
- Key Laboratory of Applied Technology on Green-Eco-Healthy Animal Husbandry of Zhejiang Province, College of Animal Science and Technology, College of Veterinary Medicine, Zhejiang A & F University, Hangzhou 311300, China;
| | - Aikun Fu
- Ministry of Agriculture and Key Laboratory of Animal Feed and Nutrition of Zhejiang Province, Key Laboratory of Animal Nutrition and Feed in East China, Feed Science Institute, College of Animal Science, Zhejiang University, Hangzhou 310058, China; (L.X.); (Y.X.); (X.D.); (K.L.); (S.L.); (D.L.); (A.F.)
| | - Weixiang Yu
- Animal Husbandry and Veterinary Services Center of Haiyan, Jiaxing 314300, China
| | - Xiuan Zhan
- Ministry of Agriculture and Key Laboratory of Animal Feed and Nutrition of Zhejiang Province, Key Laboratory of Animal Nutrition and Feed in East China, Feed Science Institute, College of Animal Science, Zhejiang University, Hangzhou 310058, China; (L.X.); (Y.X.); (X.D.); (K.L.); (S.L.); (D.L.); (A.F.)
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Proanthocyanidins Activate Nrf2/ARE Signaling Pathway in Intestinal Epithelial Cells by Inhibiting the Ubiquitinated Degradation of Nrf2. BIOMED RESEARCH INTERNATIONAL 2022; 2022:8562795. [PMID: 36033575 PMCID: PMC9410805 DOI: 10.1155/2022/8562795] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/01/2021] [Revised: 02/07/2022] [Accepted: 07/25/2022] [Indexed: 12/03/2022]
Abstract
Nrf2 plays a key role in the antioxidant system, and many antioxidants can activate the Nrf2/ARE signaling pathway and alleviate oxidative stress. However, the underlying mechanisms of antioxidants, such as proanthocyanidin- (PC-) induced Nrf2 activation, remain poorly understood. In this study, PC was used on MODE-K cells at different concentrations (0, 1, 2.5, and 5 μg/mL) and different times (0, 3, 6, 12, and 24 h); then, immunoprecipitation, immunofluorescence, and Western blotting were performed to test Nrf2, Bach1, Keap1, HO-1, and NQO1 protein expressions in MODE-K cells. Results showed that PC increased Nrf2, HO-1, and NQO1 protein expressions, decreased Keap1 and Bach1 protein expressions, and enhanced ARE gene activity. PC also decreased the ubiquitinated degradation of the Nrf2 protein, increased Nrf2 protein stability, and increased Nrf2 protein expression by inhibiting Keap1-dependent Nrf2 protein degradation, promoted Nrf2 entry into the nucleus, competed with Bach1, and activated ARE elements, which in turn initiated the Nrf2/ARE signaling pathway. Thus, we conclude that PC activates the Nrf2/ARE signaling pathway in intestinal epithelial cells by inhibiting the ubiquitinated degradation of Nrf2, increasing Nrf2 protein stability and expression, and then regulating key antioxidant enzymes such as HO-1 and NQO1 to initiate cytoprotective effects.
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Fukai M, Nakayabu T, Ohtani S, Shibata K, Shimada S, Sakamoto S, Fuda H, Furukawa T, Watanabe M, Hui SP, Chiba H, Shimamura T, Taketomi A. The Phenolic Antioxidant 3,5-dihydroxy-4-methoxybenzyl Alcohol (DHMBA) Prevents Enterocyte Cell Death under Oxygen-Dissolving Cold Conditions through Polyphyletic Antioxidant Actions. J Clin Med 2021; 10:jcm10091972. [PMID: 34064340 PMCID: PMC8124816 DOI: 10.3390/jcm10091972] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Revised: 04/26/2021] [Accepted: 04/29/2021] [Indexed: 12/19/2022] Open
Abstract
Cold preservation in University of Wisconsin (UW) solution is not enough to maintain the viability of the small intestine, due to the oxidative stress. The novel phenolic antioxidant 3,5-dihydroxy-4-methoxybenzyl alcohol (DHMBA) has dual properties to reduce oxidative stress, radical scavenging, and antioxidant protein induction, in other cells. This study was designed to determine whether DHMBA reduces cold preservation injury of enterocytes, and to identify the effector site. Enterocytes were subjected to 48-h cold preservation under atmosphere in UW solution (±DHMBA), and then returned to normal culture to replicate reperfusion of the small intestine after cold preservation. At the end of cold preservation (ECP) and at 1, 3, 6, and 72 h after rewarming (R1h, R3h, R6h, and R72h), we evaluated cell function and the injury mechanism. The results showed that DHMBA protected mitochondrial function mainly during cold preservation, and suppressed cell death after rewarming, as shown by the MTT, ATP, mitochondrial membrane potential, LDH, and lipid peroxidation assays, together with enhanced survival signals (PI3K, Akt, p70S6K) and induction of antioxidant proteins (HO-1, NQO-1, TRX-1). We found that DHMBA mitigates the cold-induced injury of enterocytes by protecting the mitochondria through direct and indirect antioxidative activities.
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Affiliation(s)
- Moto Fukai
- Department of Gastroenterological Surgery I, Graduate School of Medicine, Hokkaido University, Nishi 7, Kita 15, Kita-ku, Sapporo 060-8638, Hokkaido, Japan; (T.N.); (S.O.); (K.S.); (S.S.); (S.S.); (A.T.)
- Correspondence: ; Tel.: +81-11-7065927; Fax: +81-11-7177515
| | - Takuya Nakayabu
- Department of Gastroenterological Surgery I, Graduate School of Medicine, Hokkaido University, Nishi 7, Kita 15, Kita-ku, Sapporo 060-8638, Hokkaido, Japan; (T.N.); (S.O.); (K.S.); (S.S.); (S.S.); (A.T.)
| | - Shintaro Ohtani
- Department of Gastroenterological Surgery I, Graduate School of Medicine, Hokkaido University, Nishi 7, Kita 15, Kita-ku, Sapporo 060-8638, Hokkaido, Japan; (T.N.); (S.O.); (K.S.); (S.S.); (S.S.); (A.T.)
| | - Kengo Shibata
- Department of Gastroenterological Surgery I, Graduate School of Medicine, Hokkaido University, Nishi 7, Kita 15, Kita-ku, Sapporo 060-8638, Hokkaido, Japan; (T.N.); (S.O.); (K.S.); (S.S.); (S.S.); (A.T.)
| | - Shingo Shimada
- Department of Gastroenterological Surgery I, Graduate School of Medicine, Hokkaido University, Nishi 7, Kita 15, Kita-ku, Sapporo 060-8638, Hokkaido, Japan; (T.N.); (S.O.); (K.S.); (S.S.); (S.S.); (A.T.)
| | - Soudai Sakamoto
- Department of Gastroenterological Surgery I, Graduate School of Medicine, Hokkaido University, Nishi 7, Kita 15, Kita-ku, Sapporo 060-8638, Hokkaido, Japan; (T.N.); (S.O.); (K.S.); (S.S.); (S.S.); (A.T.)
| | - Hirotoshi Fuda
- Faculty of Health Sciences, Graduate School of Health Sciences, Hokkaido University, Nishi5, Kita12, Kita-ku, Sapporo 060-0812, Hokkaido, Japan; (H.F.); (T.F.); (M.W.); (S.-P.H.); (H.C.)
| | - Takayuki Furukawa
- Faculty of Health Sciences, Graduate School of Health Sciences, Hokkaido University, Nishi5, Kita12, Kita-ku, Sapporo 060-0812, Hokkaido, Japan; (H.F.); (T.F.); (M.W.); (S.-P.H.); (H.C.)
| | - Mitsugu Watanabe
- Faculty of Health Sciences, Graduate School of Health Sciences, Hokkaido University, Nishi5, Kita12, Kita-ku, Sapporo 060-0812, Hokkaido, Japan; (H.F.); (T.F.); (M.W.); (S.-P.H.); (H.C.)
- Watanabe Oyster Laboratory Co. Ltd., 490-3, Shimoongata-cho, Hachioji 190-0154, Tokyo, Japan
| | - Shu-Ping Hui
- Faculty of Health Sciences, Graduate School of Health Sciences, Hokkaido University, Nishi5, Kita12, Kita-ku, Sapporo 060-0812, Hokkaido, Japan; (H.F.); (T.F.); (M.W.); (S.-P.H.); (H.C.)
| | - Hitoshi Chiba
- Faculty of Health Sciences, Graduate School of Health Sciences, Hokkaido University, Nishi5, Kita12, Kita-ku, Sapporo 060-0812, Hokkaido, Japan; (H.F.); (T.F.); (M.W.); (S.-P.H.); (H.C.)
- Department of Nutrition, Sapporo University of Health Sciences, 1-15, 2 chome, Nakanumanishi4jou, Higashi-ku, Sapporo 007-0894, Hokkaido, Japan
| | - Tsuyoshi Shimamura
- Division of Organ Transplantation, Central Clinical Facilities, Hokkaido University Hospital, Nishi5 Kita14, Kita-ku, Sapporo 060-8648, Hokkaido, Japan;
| | - Akinobu Taketomi
- Department of Gastroenterological Surgery I, Graduate School of Medicine, Hokkaido University, Nishi 7, Kita 15, Kita-ku, Sapporo 060-8638, Hokkaido, Japan; (T.N.); (S.O.); (K.S.); (S.S.); (S.S.); (A.T.)
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Role of Heme-Oxygenase-1 in Biology of Cardiomyocytes Derived from Human Induced Pluripotent Stem Cells. Cells 2021; 10:cells10030522. [PMID: 33804563 PMCID: PMC8000937 DOI: 10.3390/cells10030522] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2020] [Revised: 02/18/2021] [Accepted: 02/24/2021] [Indexed: 02/06/2023] Open
Abstract
Heme oxygenase-1 (HO-1, encoded by HMOX1) is a cytoprotective enzyme degrading heme into CO, Fe2+, and biliverdin. HO-1 was demonstrated to affect cardiac differentiation of murine pluripotent stem cells (PSCs), regulate the metabolism of murine adult cardiomyocytes, and influence regeneration of infarcted myocardium in mice. However, the enzyme’s effect on human cardiogenesis and human cardiomyocytes’ electromechanical properties has not been described so far. Thus, this study aimed to investigate the role of HO-1 in the differentiation of human induced pluripotent stem cells (hiPSCs) into hiPSC-derived cardiomyocytes (hiPSC-CMs). hiPSCs were generated from human fibroblasts and peripheral blood mononuclear cells using Sendai vectors and subjected to CRISPR/Cas9-mediated HMOX1 knock-out. After confirming lack of HO-1 expression on the protein level, isogenic control and HO-1-deficient hiPSCs were differentiated into hiPSC-CMs. No differences in differentiation efficiency and hiPSC-CMs metabolism were observed in both cell types. The global transcriptomic analysis revealed, on the other hand, alterations in electrophysiological pathways in hiPSC-CMs devoid of HO-1, which also demonstrated increased size. Functional consequences in changes in expression of ion channels genes were then confirmed by patch-clamp analysis. To the best of our knowledge, this is the first report demonstrating the link between HO-1 and electrophysiology in human cardiomyocytes.
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Wang Y, Li N, Zeng Z, Tang L, Zhao S, Zhou F, Zhou L, Xia W, Zhu C, Rao M. Humanin regulates oxidative stress in the ovaries of polycystic ovary syndrome patients via the Keap1/Nrf2 pathway. Mol Hum Reprod 2021; 27:gaaa081. [PMID: 33337472 DOI: 10.1093/molehr/gaaa081] [Citation(s) in RCA: 33] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Revised: 11/18/2020] [Indexed: 02/06/2023] Open
Abstract
Polycystic ovary syndrome (PCOS) is the most common endocrinological pathology among women of reproductive age, whereas the pathogenesis is still not fully understood. Systemic and ovarian oxidative stress (OS) imbalance is a pivotal feature of PCOS. Humanin, a mitochondria-derived peptide, has been reported to function as an antioxidant in cardiomyocytes, pancreatic beta cells and other cells, but how this function is regulated remains unclear. In this study, we investigated whether humanin expression differs in the granulosa cells (GCs) of PCOS patients versus controls, and whether humanin alleviates OS in PCOS ovaries. Sixteen PCOS patients and 28 age- and BMI-matched controls undergoing IVF were recruited, and their serum, follicular fluid and GCs were collected for humanin analysis. Dehydroepiandrosterone-induced rat PCOS models, and vitamin K3-induced OS COV434 cell lines were applied to investigate the mechanism. Humanin expression was significantly down-regulated in the ovaries of PCOS patients relative to those of non-PCOS patients. Exogenous humanin supplementation significantly attenuated body weight gain, ovarian morphological abnormalities, endocrinological disorders and ovarian and systemic OS in PCOS rat models. Our study further demonstrated that this attenuation effect was involved in the modulation of the Kelch-like ECH-associated protein 1 (Keap1)/nuclear factor-erythroid 2-related factor 2 (Nrf2) signalling pathway. In summary, this study reported for the first time that decreased expression of humanin in the GCs was associated with oxidative imbalance in PCOS. Humanin alleviates OS in ovarian GCs of PCOS patients via modulation of the Keap1/Nrf2 signalling pathway.
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Affiliation(s)
- Yingying Wang
- Family Planning Research Institute, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Nianyu Li
- Family Planning Research Institute, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Zhengyan Zeng
- Department of Neurology, The First Affiliated Hospital of Kunming Medical University, Kunming, China
| | - Li Tang
- Department of Reproduction and Genetics, The First affiliated Hospital of Kunming Medical University, Kunming, China
| | - Shuhua Zhao
- Department of Reproduction and Genetics, The First affiliated Hospital of Kunming Medical University, Kunming, China
| | - Fang Zhou
- Family Planning Research Institute, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Liping Zhou
- Family Planning Research Institute, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Wei Xia
- Family Planning Research Institute, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Reproductive Medicine Center, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Changhong Zhu
- Family Planning Research Institute, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Reproductive Medicine Center, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Meng Rao
- Department of Reproduction and Genetics, The First affiliated Hospital of Kunming Medical University, Kunming, China
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Hopper CP, De La Cruz LK, Lyles KV, Wareham LK, Gilbert JA, Eichenbaum Z, Magierowski M, Poole RK, Wollborn J, Wang B. Role of Carbon Monoxide in Host-Gut Microbiome Communication. Chem Rev 2020; 120:13273-13311. [PMID: 33089988 DOI: 10.1021/acs.chemrev.0c00586] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Nature is full of examples of symbiotic relationships. The critical symbiotic relation between host and mutualistic bacteria is attracting increasing attention to the degree that the gut microbiome is proposed by some as a new organ system. The microbiome exerts its systemic effect through a diverse range of metabolites, which include gaseous molecules such as H2, CO2, NH3, CH4, NO, H2S, and CO. In turn, the human host can influence the microbiome through these gaseous molecules as well in a reciprocal manner. Among these gaseous molecules, NO, H2S, and CO occupy a special place because of their widely known physiological functions in the host and their overlap and similarity in both targets and functions. The roles that NO and H2S play have been extensively examined by others. Herein, the roles of CO in host-gut microbiome communication are examined through a discussion of (1) host production and function of CO, (2) available CO donors as research tools, (3) CO production from diet and bacterial sources, (4) effect of CO on bacteria including CO sensing, and (5) gut microbiome production of CO. There is a large amount of literature suggesting the "messenger" role of CO in host-gut microbiome communication. However, much more work is needed to begin achieving a systematic understanding of this issue.
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Affiliation(s)
- Christopher P Hopper
- Institute for Experimental Biomedicine, University Hospital Wuerzburg, Wuerzburg, Bavaria DE 97080, Germany.,Department of Medicinal Chemistry, College of Pharmacy, The University of Florida, Gainesville, Florida 32611, United States
| | - Ladie Kimberly De La Cruz
- Department of Chemistry & Center for Diagnostics and Therapeutics, Georgia State University, Atlanta, Georgia 30303, United States
| | - Kristin V Lyles
- Department of Biology, Georgia State University, Atlanta, Georgia 30303, United States
| | - Lauren K Wareham
- The Vanderbilt Eye Institute and Department of Ophthalmology & Visual Sciences, The Vanderbilt University Medical Center and School of Medicine, Nashville, Tennessee 37232, United States
| | - Jack A Gilbert
- Department of Pediatrics, Scripps Institution of Oceanography, University of California San Diego, La Jolla, California 92093, United States
| | - Zehava Eichenbaum
- Department of Biology, Georgia State University, Atlanta, Georgia 30303, United States
| | - Marcin Magierowski
- Cellular Engineering and Isotope Diagnostics Laboratory, Department of Physiology, Jagiellonian University Medical College, Cracow PL 31-531, Poland
| | - Robert K Poole
- Department of Molecular Biology and Biotechnology, The University of Sheffield, Firth Court, Sheffield S10 2TN, U.K
| | - Jakob Wollborn
- Department of Anesthesiology and Critical Care, Medical Center, University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg DE 79085, Germany.,Department of Anesthesiology, Perioperative and Pain Management, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts 02115, United States
| | - Binghe Wang
- Department of Chemistry & Center for Diagnostics and Therapeutics, Georgia State University, Atlanta, Georgia 30303, United States
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SIAH2-mediated and organ-specific restriction of HO-1 expression by a dual mechanism. Sci Rep 2020; 10:2268. [PMID: 32042051 PMCID: PMC7010731 DOI: 10.1038/s41598-020-59005-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Accepted: 01/22/2020] [Indexed: 12/11/2022] Open
Abstract
The intracellular levels of the cytoprotective enzyme heme oxygenase-1 (HO-1) are tightly controlled. Here, we reveal a novel mechanism preventing the exaggerated expression of HO-1. The analysis of mice with a knock-out in the ubiquitin E3 ligase seven in absentia homolog 2 (SIAH2) showed elevated HO-1 protein levels in specific organs such as heart, kidney and skeletal muscle. Increased HO-1 protein amounts were also seen in human cells deleted for the SIAH2 gene. The higher HO-1 levels are not only due to an increased protein stability but also to elevated expression of the HO-1 encoding HMOX1 gene, which depends on the transcription factor nuclear factor E2-related factor 2 (NRF2), a known SIAH2 target. Dependent on its RING (really interesting new gene) domain, expression of SIAH2 mediates proteasome-dependent degradation of its interaction partner HO-1. Additionally SIAH2-deficient cells are also characterized by reduced expression levels of glutathione peroxidase 4 (GPX4), rendering the knock-out cells more sensitive to ferroptosis.
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Simvastatin Treatment Upregulates HO-1 in Patients with Abdominal Aortic Aneurysm but Independently of Nrf2. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2018; 2018:2028936. [PMID: 29743974 PMCID: PMC5883937 DOI: 10.1155/2018/2028936] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/23/2017] [Revised: 01/08/2018] [Accepted: 01/16/2018] [Indexed: 12/24/2022]
Abstract
Heme oxygenase-1 (HO-1), encoded by HMOX1 gene and regulated by Nrf2 transcription factor, is a cytoprotective enzyme. Its deficiency may exacerbate abdominal aortic aneurysm (AAA) development, which is also often associated with hyperlipidemia. Beneficial effects of statins, the broadly used antilipidemic drugs, were attributed to modulation of Nrf2/HO-1 axis. However, the effect of statins on Nrf2/HO-1 pathway in patients with AAA has not been studied yet. We analyzed AAA tissue from patients treated with simvastatin (N = 28) or without statins (N = 14). Simvastatin treatment increased HO-1 protein level in AAA, both in endothelial cells (ECs) and in smooth muscle cells (SMCs), but increased Nrf2 localization was restricted only to vasa vasorum. Nrf2 target genes HMOX1, NQO1, and GCLM expression remained unchanged in AAA. In vitro studies showed that simvastatin raises HO-1 protein level slightly in ECs and to much higher extent in SMCs, which is not related to Nrf2/ARE activation, although HMOX1 expression is upregulated by simvastatin in both cell types. In conclusion, simvastatin-induced modulation of HO-1 level in ECs and SMCs in vitro is not related to Nrf2/ARE activity. Likewise, divergent HO-1 and Nrf2 localization together with stable expression of Nrf2 target genes, including HMOX1, in AAA tissue denotes Nrf2 independency.
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