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Li L, Qin Y, Xin X, Wang S, Liu Z, Feng X. The great potential of flavonoids as candidate drugs for NAFLD. Biomed Pharmacother 2023; 164:114991. [PMID: 37302319 DOI: 10.1016/j.biopha.2023.114991] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2023] [Revised: 06/05/2023] [Accepted: 06/06/2023] [Indexed: 06/13/2023] Open
Abstract
Non-alcoholic fatty liver disease (NAFLD) has a global prevalence of approximately 25 % and is associated with high morbidity and high mortality. NAFLD is a leading cause of cirrhosis and hepatocellular carcinoma. Its pathophysiology is complex and still poorly understood, and there are no drugs used in the clinic to specifically treat NAFLD. Its pathogenesis involves the accumulation of excess lipids in the liver, leading to lipid metabolism disorders and inflammation. Phytochemicals with the potential to prevent or treat excess lipid accumulation have recently received increasing attention, as they are potentially more suitable for long-term use than are traditional therapeutic compounds. In this review, we summarize the classification, biochemical properties, and biological functions of flavonoids and how they are used in the treatment of NAFLD. Highlighting the roles and pharmacological uses of these compounds will be of importance for enhancing the prevention and treatment of NAFLD.
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Affiliation(s)
- Liangge Li
- Key Laboratory of Endocrine Glucose & Lipids Metabolism and Brain Aging, Ministry of Education; Department of Endocrinology, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong, 250021, China; School of Clinical and Basic Medical Sciences, Shandong First Medical University& Shandong Academy of Medical Sciences, Jinan 250117, Shandong, China
| | - Yiming Qin
- Key Laboratory of Endocrine Glucose & Lipids Metabolism and Brain Aging, Ministry of Education; Department of Endocrinology, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong, 250021, China; School of Clinical and Basic Medical Sciences, Shandong First Medical University& Shandong Academy of Medical Sciences, Jinan 250117, Shandong, China
| | - Xijian Xin
- Key Laboratory of Endocrine Glucose & Lipids Metabolism and Brain Aging, Ministry of Education; Department of Endocrinology, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong, 250021, China; School of Clinical and Basic Medical Sciences, Shandong First Medical University& Shandong Academy of Medical Sciences, Jinan 250117, Shandong, China
| | - Shendong Wang
- Key Laboratory of Endocrine Glucose & Lipids Metabolism and Brain Aging, Ministry of Education; Department of Endocrinology, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong, 250021, China; School of Clinical and Basic Medical Sciences, Shandong First Medical University& Shandong Academy of Medical Sciences, Jinan 250117, Shandong, China
| | - Zhaojun Liu
- Key Laboratory of Endocrine Glucose & Lipids Metabolism and Brain Aging, Ministry of Education; Department of Endocrinology, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong, 250021, China; School of Clinical and Basic Medical Sciences, Shandong First Medical University& Shandong Academy of Medical Sciences, Jinan 250117, Shandong, China
| | - Xiujing Feng
- Key Laboratory of Endocrine Glucose & Lipids Metabolism and Brain Aging, Ministry of Education; Department of Endocrinology, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong, 250021, China; School of Clinical and Basic Medical Sciences, Shandong First Medical University& Shandong Academy of Medical Sciences, Jinan 250117, Shandong, China.
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Jin M, Wei Y, Yu H, Ma X, Yan S, Zhao L, Ding L, Cheng J, Feng H. Erythritol Improves Nonalcoholic Fatty Liver Disease by Activating Nrf2 Antioxidant Capacity. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2021; 69:13080-13092. [PMID: 34719928 DOI: 10.1021/acs.jafc.1c05213] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Nonalcoholic fatty liver disease (NAFLD) is a kind of serious fat disorder that has become a critical problem to human society. Therefore, finding drugs that are safe and effective has become more and more important. Erythritol (Ery) is a polyol sweetener with a variety of biological functions. However, whether Ery has a relieving effect on NAFLD has not been reported yet. Therefore, we induced HepG2 cells with oleic acid and palmitic acid as our in vitro model. Moreover, we choose wild-type mice with tyloxapol and high-fat diet and nuclear factor E2-related factor 2 (Nrf2) knockout mice with high-fat diet as our in vivo model. We found that Ery could reverse the lipid accumulation, oxidative stress, and endoplasmic reticulum stress caused by the NAFLD model. The mechanism studies showed that Ery promoted the translocation of Nrf2 from cytoplasm to nucleus, and the molecular simulation docking results of Ery and Nrf2 showed that there was a hydrogen bond between them. Moreover, Ery could promote the production of HO-1 and NQO1 antioxidant proteins and inhibit the expression of endoplasmic reticulum stress proteins GPR78, p-PERK, and CHOP. On the contrast, when Nrf2 was knocked out in mice, Ery lost its protective effect on NAFLD. In conclusion, we found that the potential mechanism of Ery's protective effect is that it plays an antioxidant role by activating the Nrf2 signaling pathway, thereby inhibiting endoplasmic reticulum stress and lipid accumulation in NAFLD.
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Affiliation(s)
- Meiyu Jin
- Key Laboratory of Zoonosis, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, Jilin 130062, PR China
| | - Yunfei Wei
- Key Laboratory of Zoonosis, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, Jilin 130062, PR China
| | - Hao Yu
- Key Laboratory of Zoonosis, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, Jilin 130062, PR China
| | - Xin Ma
- Key Laboratory of Zoonosis, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, Jilin 130062, PR China
| | - Siru Yan
- Key Laboratory of Zoonosis, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, Jilin 130062, PR China
| | - Lilei Zhao
- Key Laboratory of Zoonosis, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, Jilin 130062, PR China
| | - Lu Ding
- Key Laboratory of Zoonosis, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, Jilin 130062, PR China
| | - Jiaqi Cheng
- Key Laboratory of Zoonosis, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, Jilin 130062, PR China
| | - Haihua Feng
- Key Laboratory of Zoonosis, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, Jilin 130062, PR China
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Speciale A, Saija A, Bashllari R, Molonia MS, Muscarà C, Occhiuto C, Cimino F, Cristani M. Anthocyanins As Modulators of Cell Redox-Dependent Pathways in Non-Communicable Diseases. Curr Med Chem 2020; 27:1955-1996. [PMID: 30417771 DOI: 10.2174/0929867325666181112093336] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Revised: 10/22/2018] [Accepted: 11/04/2018] [Indexed: 12/15/2022]
Abstract
Chronic Noncommunicable Diseases (NCDs), mostly represented by cardiovascular diseases, diabetes, chronic pulmonary diseases, cancers, and several chronic pathologies, are one of the main causes of morbidity and mortality, and are mainly related to the occurrence of metabolic risk factors. Anthocyanins (ACNs) possess a wide spectrum of biological activities, such as anti-inflammatory, antioxidant, cardioprotective and chemopreventive properties, which are able to promote human health. Although ACNs present an apparent low bioavailability, their metabolites may play an important role in the in vivo protective effects observed. This article directly addresses the scientific evidences supporting that ACNs could be useful to protect human population against several NCDs not only acting as antioxidant but through their capability to modulate cell redox-dependent signaling. In particular, ACNs interact with the NF-κB and AP-1 signal transduction pathways, which respond to oxidative signals and mediate a proinflammatory effect, and the Nrf2/ARE pathway and its regulated cytoprotective proteins (GST, NQO, HO-1, etc.), involved in both cellular antioxidant defenses and elimination/inactivation of toxic compounds, so countering the alterations caused by conditions of chemical/oxidative stress. In addition, supposed crosstalks could contribute to explain the protective effects of ACNs in different pathological conditions characterized by an altered balance among these pathways. Thus, this review underlines the importance of specific nutritional molecules for human health and focuses on the molecular targets and the underlying mechanisms of ACNs against various diseases.
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Affiliation(s)
- Antonio Speciale
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Messina, Italy
| | - Antonella Saija
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Messina, Italy
| | - Romina Bashllari
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Messina, Italy
| | - Maria Sofia Molonia
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Messina, Italy
| | - Claudia Muscarà
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Messina, Italy.,"Prof. Antonio Imbesi" Foundation, University of Messina, Messina, Italy
| | - Cristina Occhiuto
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Messina, Italy
| | - Francesco Cimino
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Messina, Italy
| | - Mariateresa Cristani
- Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Messina, Italy
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Apaza Ticona LN, Tena Pérez V, Bermejo Benito P. Local/traditional uses, secondary metabolites and biological activities of Mashua (Tropaeolum tuberosum Ruíz & Pavón). JOURNAL OF ETHNOPHARMACOLOGY 2020; 247:112152. [PMID: 31421183 DOI: 10.1016/j.jep.2019.112152] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2019] [Revised: 07/23/2019] [Accepted: 08/09/2019] [Indexed: 06/10/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Tropaeolum tuberosum Ruíz & Pavón (Tropaeolaceae). Sim (commonly called Mashua) is an indigenous plant that has medicinal values for various ethnic groups of the regions of the Andes mountain range of South America, which use it for the treatment of diseases venereal, lung and skin; for the healing of internal and external wounds; and as an analgesic for kidney and bladder pain. AIM OF THE REVIEW We critically summarised the current evidence on the botanic characterisation and distribution, ethnopharmacology, secondary metabolites, pharmacological activities, qualitative and quantitative analysis, and toxicology of T. tuberosum. MATERIALS AND METHODS The relevant information on T. tuberosum was gathered from worldwide accepted scientific databases via electronic search (Google scholar, Elsevier, SciFinder, ScienceDirect, PubMed, SpringerLink, Web of Science, Scopus, Wiley Online, Mendeley, Scielo and Dialnet electronic databases). Information was also obtained from the literature and books as well as PhD and MSc dissertations. Plant names were validated by 'The Plant List' (www.theplantlist.org). RESULTS T. tuberosum has diverse uses in local and popular medicine, specifically for relieving pain and infections in humans. Regarding its biological activities, polar extracts (aqueous, hydroalcoholic) and isolated compounds from the tubers have exhibited a wide range of in vitro and in vivo pharmacological effects, including antibacterial, antioxidant, anti-inflammatory activities. Quantitative analysis (e.g., NMR, HPLC, GC-MS) indicated the presence of a set of secondary metabolites, including hydroxybenzoic acids, tannins, flavanols, anthocyanins, glucosinolates, isothiocyanates, phytosterols, fatty acids and alkamides in the tubers of T. tuberosum. Likewise, glucosinolates have been identified in the seeds and isothiocyanates have been detected in leaves, flowers and seeds. CONCLUSIONS T. tuberosum has been tested for various biological activities and the extracts (tubers in particular) demonstrated a promising potential as an antibacterial, antioxidant, anti-inflammatory and inhibitors of benign prostatic hyperplasia. A lack of alignment between the ethno-medicinal uses and existing biological screenings was observed, indicating the need to explore its potential for the treatment against respiratory affections, urinary affections and blood diseases. Likewise, it is necessary to analyse deeply the relationship that exists between the different tuber colours of T. tuberosum and its use for the treatment of certain diseases. Validation of clinical studies of the antibacterial, antioxidant/anti-inflammatory, anti-spermatogenic activities and as inhibitors of benign prostatic hyperplasia is required. Moreover, studies on the toxicity, bioavailability, and pharmacokinetics, in addition to clinical trials, are indispensable for assessing the safety and efficacy of the active metabolites or extracts obtained from T. tuberosum. Other areas that need investigation are the development of future applications based on their active metabolites, such as neurodegenerative diseases (Alzheimer's disease, Parkinson's disease, Huntington's disease). Finally, the work purposes to motivate other research groups to carry out a series of scientific studies that can fill the gaps that exist with respect to Mashua properties, and thus be able to change the focus of T. tuberosum (Mashua) that currently has in the consumer society.
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Affiliation(s)
- Luis Nestor Apaza Ticona
- Department of Organic Chemistry, Faculty of Sciences, University Autónoma of Madrid, Cantoblanco, 28049, Madrid, Spain; Department of Pharmacology, Pharmacognosy and Botany, Faculty of Pharmacy, University Complutense of Madrid, Ciudad Universitaria S/n, 28040, Madrid, Spain.
| | - Victor Tena Pérez
- Department of Organic Chemistry, Faculty of Sciences, University Autónoma of Madrid, Cantoblanco, 28049, Madrid, Spain
| | - Paulina Bermejo Benito
- Department of Pharmacology, Pharmacognosy and Botany, Faculty of Pharmacy, University Complutense of Madrid, Ciudad Universitaria S/n, 28040, Madrid, Spain
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Xiaohong W, Jun Z, Hongmei G, Fan Q. CFLAR is a critical regulator of cerebral ischaemia-reperfusion injury through regulating inflammation and endoplasmic reticulum (ER) stress. Biomed Pharmacother 2019; 117:109155. [DOI: 10.1016/j.biopha.2019.109155] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2019] [Revised: 06/18/2019] [Accepted: 06/19/2019] [Indexed: 12/11/2022] Open
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Polyphenol-rich blue honeysuckle extract alleviates silica-induced lung fibrosis by modulating Th immune response and NRF2/HO-1 MAPK signaling. J Funct Foods 2019. [DOI: 10.1016/j.jff.2018.12.030] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
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Jiang X, Li X, Zhu C, Sun J, Tian L, Chen W, Bai W. The target cells of anthocyanins in metabolic syndrome. Crit Rev Food Sci Nutr 2018; 59:921-946. [DOI: 10.1080/10408398.2018.1491022] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Xinwei Jiang
- Department of Food Science and Engineering, Institute of Food Safety and Nutrition, Guangdong Engineering Technology Center of Food Safety Molecular Rapid Detection, Jinan University, Guangzhou, PR China
| | - Xusheng Li
- Department of Food Science and Engineering, Institute of Food Safety and Nutrition, Guangdong Engineering Technology Center of Food Safety Molecular Rapid Detection, Jinan University, Guangzhou, PR China
| | - Cuijuan Zhu
- Department of Food Science and Engineering, Institute of Food Safety and Nutrition, Guangdong Engineering Technology Center of Food Safety Molecular Rapid Detection, Jinan University, Guangzhou, PR China
| | - Jianxia Sun
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, PR China
| | - Lingmin Tian
- Department of Food Science and Engineering, Institute of Food Safety and Nutrition, Guangdong Engineering Technology Center of Food Safety Molecular Rapid Detection, Jinan University, Guangzhou, PR China
| | - Wei Chen
- State Key Laboratory of Food Science and Technology School of Food Science and Technology, Jiangnan University, Wuxi, P. R. China
| | - Weibin Bai
- Department of Food Science and Engineering, Institute of Food Safety and Nutrition, Guangdong Engineering Technology Center of Food Safety Molecular Rapid Detection, Jinan University, Guangzhou, PR China
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Bai RX, Xu YY, Qin G, Chen YM, Wang HF, Wang M, Du SY. Repression of TXNIP-NLRP3 axis restores intestinal barrier function via inhibition of myeloperoxidase activity and oxidative stress in nonalcoholic steatohepatitis. J Cell Physiol 2018; 234:7524-7538. [PMID: 30387131 DOI: 10.1002/jcp.27513] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2018] [Accepted: 09/10/2018] [Indexed: 12/13/2022]
Abstract
Dysfunction of the intestinal barrier function occurs in hepatic injury, but the specific mechanisms responsible are largely unknown. Recently, NOD-like receptor 3 (NLRP3) inflammasome functions in impairing endothelial barrier function. In this study, we test the hypothesis that TXNIP-NLRP3 axis repression prevents against intestinal barrier function disruption in nonalcoholic steatohepatitis (NASH). First, lipopolysaccharide (LPS)-induced alterations in expression of ZO-1 and occludin, myeloperoxidase (MPO) activity, reactive oxygen species (ROS) level, and transepithelial electric resistance (TEER) in intestinal epithelial cells (IECs) isolated from C57BL/6 wild-type (WT) and TXNIP-/- mice were evaluated. The underlying regulatory mechanisms of TXNIP knockout in vivo were investigated with the detection of expressions of TXNIP, NLRP3 and ZO-1, and occludin, the interaction of TXNIP-NLRP3, MPO activity, ROS level, permeability of intestinal mucosa, levels of inflammatory factors in serum, and LPS concentration. We identified that TXNIP knockout promoted ZO-1 and occludin expression, yet reduced MPO activity, ROS level, and cell permeability in IECs, indicating restored the intestinal barrier function. However, LPS upregulated TXNIP and NLRP3 expression, as well as contributed to the interaction between TXNIP and NLRP3 in vitro. Furthermore, TXNIP was significantly upregulated in the intestinal mucosa of NASH mice and its knockout repaired the intestinal barrier disrupt, inhibited expression of inflammatory factors, and reduced LPS concentration as well as hepatic injury in vivo. Taken together, our findings demonstrated that inhibited the activation of the TXNIP-NLRP3 axis reduced MPO activity and oxidative stress and thus restoring the intestinal barrier function in NASH. TXNIP-NLRP3 axis may be a promising therapeutic strategy for the NASH treatment.
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Affiliation(s)
- Ru-Xue Bai
- Department of Gastroenterology, China-Japan Friendship Hospital, Beijing, China
| | - Ying-Ying Xu
- Department of Gastroenterology, China-Japan Friendship Hospital, Beijing, China
| | - Geng Qin
- Department of Gastroenterology, China-Japan Friendship Hospital, Beijing, China
| | - Yan-Ming Chen
- Department of Gastroenterology, China-Japan Friendship Hospital, Beijing, China
| | - Hui-Fen Wang
- Department of Gastroenterology, China-Japan Friendship Hospital, Beijing, China
| | - Miao Wang
- Department of Gastroenterology, China-Japan Friendship Hospital, Beijing, China
| | - Shi-Yu Du
- Department of Gastroenterology, China-Japan Friendship Hospital, Beijing, China
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Effect of silibinin on CFLAR-JNK pathway in oleic acid-treated HepG2 cells. Biomed Pharmacother 2018; 108:716-723. [PMID: 30248539 DOI: 10.1016/j.biopha.2018.09.089] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2018] [Revised: 09/15/2018] [Accepted: 09/16/2018] [Indexed: 02/08/2023] Open
Abstract
AIMS Silibinin is a flavonolignan from milk thistle with many pharmacological activities including lipid-lowering and antioxidant. Caspase 8 and Fas-associated protein with death domain-like apoptosis regulator (CFLAR) is an important target gene in regulating non-alcoholic steatohepatitis (NASH). At present, the effect of silibinin on CFLAR-JNK pathway related to NASH was unknown. Here the effect of silibinin on CFLAR-JNK pathway and its downstream target genes involved in lipid metabolism, glucose uptake, oxidative stress and inflammatory response were studied in oleic acid (OA)-treated HepG2 cells. MAIN METHODS OA-treated HepG2 cells were employed as a in vitro model of steatosis, insulin resistance and oxidative stress. The model cells were then treated by silibinin (5, 20, 50, and 100 μM) for 24 h and detected for the related indicators as follows: (1) cellular triglycerides (TG), nitric oxide (NO) and glucose uptake; (2) the mRNA levels of the sterol regulatory element binding protein-1C (SREBP-1C), patatin-like phospholipase domain containing 3 (PNPLA3) and peroxisome proliferator activated receptor-α (PPARα); (3) the protein levels of PPARα, SREBP-1C, PNPLA3, CFLAR, phosphorylated c-Jun N-terminal kinase (pJNK), phosphatidylinositol 3-kinase (PI3K), phosphorylated serine-threonine protein kinase (pAKT), nuclear factor E2-related factor 2 (NRF2), cytochrome P450 2E1 (CYP2E1) and 4A (CYP4A). KEY FINDINGS Compared to the control, OA-treatment led to a result as follows: (1) increased the intracellular levels of TG and NO; (2) up-regulated the protein expression of SREBP-1C, PNPLA3, pJNK, CYP 2E1 and CYP 4A; (3) decreased the uptake of 2-NBDG; (4) down-regulated the protein expression of CFLAR, PPARα, PI3K, pAKT and NRF2. Compared to OA-treated HepG2 cells, silibinin treatment could improve the indicators as follows: (1) decreased the intracellular levels of TG and NO; (2) down-regulated the protein expression of SREBP-1C, PNPLA3, pJNK, CYP 2E1 and CYP 4A; (3) increased the uptake of 2-NBDG; (4) up-regulated the protein expression of CFLAR, PPARα, PI3K, pAKT and NRF2. SIGNIFICANCE Silibinin can ameliorate some metabolic alterations and induce some molecular changes by activating the CFLAR-JNK pathway and thereby regulating its downstream target genes involved in lipid metabolism (PPARα, SREBP-1C and PNPLA3), glucose uptake (PI3K-AKT), oxidative stress (NRF2, CYP2E1, CYP4A) and inflammatory response(NO) in OA-treated HepG2 cells demonstrating its possible use in ameliorating various symptoms of NASH.
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Collaborative Power of Nrf2 and PPAR γ Activators against Metabolic and Drug-Induced Oxidative Injury. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2017; 2017:1378175. [PMID: 28928902 PMCID: PMC5591982 DOI: 10.1155/2017/1378175] [Citation(s) in RCA: 72] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/06/2017] [Accepted: 07/25/2017] [Indexed: 12/30/2022]
Abstract
Mammalian cells have evolved a unique strategy to protect themselves against oxidative damage induced by reactive oxygen species (ROS). Especially, two transcription factors, nuclear factor erythroid 2p45-related factor 2 (Nrf2) and peroxisome proliferator-activated receptor γ (PPARγ), have been shown to play key roles in establishing this cellular antioxidative defense system. Recently, several researchers reported ameliorating effects of pharmacological activators for these Nrf2 and PPARγ pathways on the progression of various metabolic disorders and drug-induced organ injuries by oxidative stress. In this review, general features of Nrf2 and PPARγ pathways in the context of oxidative protection will be summarized first. Then, a number of successful applications of natural and synthetic Nrf2 and PPARγ activators to the alleviation of pathological and drug-related oxidative damage will be discussed later.
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Mulberry Anthocyanin Extract Ameliorates Oxidative Damage in HepG2 Cells and Prolongs the Lifespan of Caenorhabditis elegans through MAPK and Nrf2 Pathways. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2017; 2017:7956158. [PMID: 28713491 PMCID: PMC5497675 DOI: 10.1155/2017/7956158] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/16/2017] [Revised: 03/31/2017] [Accepted: 05/11/2017] [Indexed: 12/20/2022]
Abstract
Mulberry anthocyanins possess many pharmacological effects including liver protection, anti-inflammation, and anticancer. The aim of this study was to evaluate whether mulberry anthocyanin extract (MAE) exerts beneficial effects against oxidative stress damage in HepG2 cells and Caenorhabditis elegans. In vitro, MAE prevented cytotoxicity, increased glucose consumption and uptake, and eliminated excessive intracellular free radicals in H2O2-induced cells. Moreover, MAE pretreatment maintained Nrf2, HO-1, and p38 MAPK stimulation and abolished upregulation of p-JNK, FOXO1, and PGC-1α that were involved in oxidative stress and insulin signalling modulation. In vivo, extended lifespan was observed in C. elegans damaged by paraquat in the presence of MAE, while these beneficial effects were disappeared in pmk-1 and daf-16 mutants. PMK-1 and SKN-1 were activated after exposure to paraquat and MAE suppressed PMK-1 activation but enhanced SKN-1 stimulation. Our findings suggested that MAE recovered redox status in HepG2 cells and C. elegans that suffered from oxidative stress, which might be by targeting MAPKs and Nrf2.
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Shin JH, Jung JH. Non-alcoholic fatty liver disease and flavonoids: Current perspectives. Clin Res Hepatol Gastroenterol 2017; 41:17-24. [PMID: 27545758 DOI: 10.1016/j.clinre.2016.07.001] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/24/2016] [Revised: 06/21/2016] [Accepted: 07/07/2016] [Indexed: 02/04/2023]
Abstract
Non-alcoholic fatty liver disease (NAFLD) is an accumulation of fat in the liver despite a low level of alcohol intake, with signs of hepatomegaly. Although in the past, NAFLD was predominantly viewed as an aspect of metabolic syndrome, it is now considered that it should be classified as an independent condition similar to obesity, diabetes, and hypertension. Therefore, new treatment strategies, not based on correcting insulin resistance, are needed for NAFLD. This work analyzes methods of prevention, therapeutic approaches, and mechanisms involved in NAFLD, focusing on the use of flavonoids (epigallocatechin-3-gallate, resveratrol, anthocyanins, and isoflavones) with high antioxidant capacity. In addition, the mechanisms of cholesterol accumulation in the liver are identified as potential avenues for entirely new approaches to NAFLD treatment, contrasting the well-known relation between neutral fat and NAFLD.
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Affiliation(s)
- Jung Hee Shin
- Department of Food & Nutrition, Joongbu University, 201 Daehak-ro, Chubu-myeon, Geumsan-gun, Chungcheongnam-Do, Republic of Korea.
| | - Ji Hye Jung
- Institute for Clinical Nutrition, Inje University, Mareunnae-ro 9, Jung-gu, Seoul, Republic of Korea.
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Song N, Zhang L, Chen W, Zhu H, Deng W, Han Y, Guo J, Qin C. Cyanidin 3- O -β-glucopyranoside activates peroxisome proliferator-activated receptor-γ and alleviates cognitive impairment in the APP swe /PS1 ΔE9 mouse model. Biochim Biophys Acta Mol Basis Dis 2016; 1862:1786-800. [DOI: 10.1016/j.bbadis.2016.05.016] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2016] [Revised: 05/04/2016] [Accepted: 05/26/2016] [Indexed: 12/11/2022]
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Parodi PW. Cooperative action of bioactive components in milk fat with PPARs may explain its anti-diabetogenic properties. Med Hypotheses 2016; 89:1-7. [DOI: 10.1016/j.mehy.2015.12.028] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2015] [Accepted: 12/30/2015] [Indexed: 01/04/2023]
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Design, synthesis and evaluation of acridine derivatives as multi-target Src and MEK kinase inhibitors for anti-tumor treatment. Bioorg Med Chem 2016; 24:261-9. [DOI: 10.1016/j.bmc.2015.12.011] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2015] [Revised: 12/01/2015] [Accepted: 12/07/2015] [Indexed: 01/17/2023]
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Tu T, Calabro SR, Lee A, Maczurek AE, Budzinska MA, Warner FJ, McLennan SV, Shackel NA. Hepatocytes in liver injury: Victim, bystander, or accomplice in progressive fibrosis? J Gastroenterol Hepatol 2015; 30:1696-704. [PMID: 26239824 DOI: 10.1111/jgh.13065] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/28/2015] [Accepted: 07/26/2015] [Indexed: 12/11/2022]
Abstract
Chronic liver disease causes significant morbidity and mortality through progressive fibrosis, cirrhosis, and liver cancer. The classical theory of fibrogenesis has hepatic stellate cells (HSCs) as the principal and only significant source of abnormal extracellular matrix (ECM). Further, HSCs have the major role in abnormal ECM turnover. It is the death of hepatocytes, as the initial target of injury, that initiates a sequence of events including the recruitment of inflammatory cells and activation of HSCs. Following this initial response, the ongoing insult to hepatocytes is regarded as perpetuating injury, but otherwise, hepatocytes are regarded as "victims" and "bystanders" in progressive fibrosis. Recent developments, however, challenge this view and suggest the concept of the hepatocyte being an active participant in liver injury. It is clear now that hepatocytes undergo phenotypic changes, adapt to injury, and react to the altered microenvironment. In this review, we describe studies showing that hepatocytes contribute to progressive fibrosis by direct manipulation of the surrounding ECM and through signaling to effector cells, particularly HSCs and intrahepatic immune cells. Together, these findings suggest an active "accomplice" role for the hepatocyte in progressive liver fibrosis and highlight novel pathways that could be targeted for development of future anti-fibrotic therapies.
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Affiliation(s)
- Thomas Tu
- Liver Injury and Cancer, Centenary Institute, Sydney, New South Wales, Australia.,Sydney Medical School, The University of Sydney, Sydney, New South Wales, Australia
| | - Sarah R Calabro
- Liver Injury and Cancer, Centenary Institute, Sydney, New South Wales, Australia.,Sydney Medical School, The University of Sydney, Sydney, New South Wales, Australia
| | - Aimei Lee
- Liver Injury and Cancer, Centenary Institute, Sydney, New South Wales, Australia.,Sydney Medical School, The University of Sydney, Sydney, New South Wales, Australia
| | - Annette E Maczurek
- Liver Injury and Cancer, Centenary Institute, Sydney, New South Wales, Australia.,Sydney Medical School, The University of Sydney, Sydney, New South Wales, Australia
| | - Magdalena A Budzinska
- Liver Injury and Cancer, Centenary Institute, Sydney, New South Wales, Australia.,Sydney Medical School, The University of Sydney, Sydney, New South Wales, Australia
| | - Fiona J Warner
- Liver Injury and Cancer, Centenary Institute, Sydney, New South Wales, Australia.,Sydney Medical School, The University of Sydney, Sydney, New South Wales, Australia
| | - Susan V McLennan
- Sydney Medical School, The University of Sydney, Sydney, New South Wales, Australia.,Department of Endocrinology, Royal Prince Alfred Hospital, Sydney, New South Wales, Australia
| | - Nicholas A Shackel
- Liver Injury and Cancer, Centenary Institute, Sydney, New South Wales, Australia.,Sydney Medical School, The University of Sydney, Sydney, New South Wales, Australia.,A. W. Morrow Gastroenterology and Liver Centre, Royal Prince Alfred Hospital, Sydney, New South Wales, Australia
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18
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Jo YH, Park HC, Choi S, Kim S, Bao C, Kim HW, Choi HK, Lee HJ, Auh JH. Metabolomic Analysis Reveals Cyanidins in Black Raspberry as Candidates for Suppression of Lipopolysaccharide-Induced Inflammation in Murine Macrophages. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2015; 63:5449-5458. [PMID: 26023864 DOI: 10.1021/acs.jafc.5b00560] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The extracts produced by multisolvent extraction and subfractionation with preparative liquid chromatography of black raspberry (Rubus coreanus Miquel) cultivated in Gochang, South Korea, were tested for their anti-inflammatory effects. The metabolomic profiling and analysis by orthogonal partial least-squares discriminant analysis (OLPS-DA) suggested that cyanidin, cyanidin-3-glucoside (C3G), and cyanidin-3-rutinoside (C3R) were key components for the anti-inflammatory responses in the most active fraction BF3-1, where they were present at 0.44, 1.26, and 0.56 μg/mg of BF3-1, respectively. Both BF3-1 and mixture of these cyanidins at the same ratio reduced lipopolysaccharide (LPS)-induced protein level of iNOS expression and suppressed mRNA and protein expressions of tumor necrosis factor (TNF)-α, interleukin (IL)-6, and IL-1β through inhibiting the phosphorylation of mitogen-activated protein kinases (MAPKs) and STAT3 in murine macrophage RAW264.7 cells. Overall, the results suggested that co-administration of cyanidin, C3G, and C3R is more effective than that of cyanidin alone and that the coexistence of these anthocyanin components in black raspberry plays a vital role in regulating LPS-induced inflammation even at submicromolar concentrations, making it possible to explain the health beneficial activity of its extracts.
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Affiliation(s)
- Young-Hee Jo
- †Department of Food Science and Technology, Chung-Ang University, Anseong 456-756, South Korea
| | - Hyun-Chang Park
- †Department of Food Science and Technology, Chung-Ang University, Anseong 456-756, South Korea
| | - Seulgi Choi
- †Department of Food Science and Technology, Chung-Ang University, Anseong 456-756, South Korea
| | - Sugyeong Kim
- †Department of Food Science and Technology, Chung-Ang University, Anseong 456-756, South Korea
| | - Cheng Bao
- †Department of Food Science and Technology, Chung-Ang University, Anseong 456-756, South Korea
| | - Hyung Woo Kim
- †Department of Food Science and Technology, Chung-Ang University, Anseong 456-756, South Korea
| | - Hyung-Kyoon Choi
- ‡College of Pharmacy, Chung-Ang University, Seoul 156-756, South Korea
| | - Hong Jin Lee
- †Department of Food Science and Technology, Chung-Ang University, Anseong 456-756, South Korea
| | - Joong-Hyuck Auh
- †Department of Food Science and Technology, Chung-Ang University, Anseong 456-756, South Korea
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19
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Tang X, Shen T, Jiang X, Xia M, Sun X, Guo H, Ling W. Purified anthocyanins from bilberry and black currant attenuate hepatic mitochondrial dysfunction and steatohepatitis in mice with methionine and choline deficiency. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2015; 63:552-561. [PMID: 25536170 DOI: 10.1021/jf504926n] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The berries of bilberry and black currant are a rich source of anthocyanins, which are thought to have favorable effects on nonalcoholic steatohepatitis (NASH). This study was designed to examine whether purified anthocyanins from bilberry and black currant are able to limit the disorders related to NASH induced by a methionine-choline-deficient (MCD) diet in mice. The results showed that treatment with anthocyanins not only alleviated inflammation, oxidative stress, steatosis, and even fibrosis but also improved depletion of mitochondrial content and damage of mitochondrial biogenesis and electron transfer chain developed concomitantly in the liver of mice fed the MCD diet. Furthermore, anthocyanins treatment promoted activation of AMP-activated protein kinase (AMPK) and expression of peroxisome proliferator-activated receptor-gamma coactivator-1α (PGC-1α). These data provide evidence that anthocyanins possess significant protective effects against NASH and mitochondrial defects in response to a MCD diet, with a mechanism maybe through affecting the AMPK/PGC-1α signaling pathways.
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Affiliation(s)
- Xilan Tang
- Department of Nutrition, School of Public Health, Sun Yat-Sen University , Guangzhou 510080, P. R. China
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20
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Yan SL, Yang HT, Lee YJ, Lin CC, Chang MH, Yin MC. Asiatic acid ameliorates hepatic lipid accumulation and insulin resistance in mice consuming a high-fat diet. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2014; 62:4625-4631. [PMID: 24779966 DOI: 10.1021/jf501165z] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Effects of asiatic acid (AA) at 10 or 20 mg/kg/day upon hepatic steatosis in mice consuming a high-fat diet (HFD) were examined. AA intake decreased body weight, water intake, feed intake, epididymal fat, and plasma and hepatic triglyceride levels in HFD-treated mice (P < 0.05). HFD enhanced 2.85-fold acetyl coenzyme A carboxylase (ACC1), 3.34-fold fatty acid synthase (FAS), 3.71-fold stearoyl CoA desaturase (SCD)-1, 3.62-fold 3-hydroxy-3-methylglutaryl coenzyme A reductase, 2.91-fold sterol regulatory element-binding protein (SREBP)-1c, and 2.75-fold SREBP-2 expression in liver (P < 0.05). Compared with HFD groups, AA intake at two doses reduced 18.9-45.7% ACC1, 25.1-49.8% FAS, 24.7-57.1% SCD-1, and 21.8-53.3% SREBP-1c protein expression (P < 0.05). Histological results indicated AA intake at two doses reduced hepatic lipid accumulation and inflammatory infiltrate. HFD increased hepatic production of reactive oxygen species, interleukin (IL)-1β, IL-6, and tumor necrosis factor-α, as well as decreased hepatic glutathione content and glutathione peroxidase and catalase activities (P < 0.05). AA intake at two doses reversed these alterations (P < 0.05). AA intake suppressed 32.4-58.8% nuclear factor kappa (NF-κ)B p65 and 24.2-56.7% p-p38 expression (P < 0.05) and at high dose down-regulated 29.1% NF-κB p50 and 40.7% p-JNK expression in livers from HFD-treated mice. AA intake at two doses lowered plasma insulin secretion and HOMR-IR (P < 0.05). These results suggest that AA is a potent hepatic protective agent against HFD-induced hepatic injury.
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Affiliation(s)
- Sheng-Lei Yan
- Division of Gastroenterology, Department of Internal Medicine, Chang Bing Show-Chwan Memorial Hospital , Changhua County, Taiwan
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21
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Bozaykut P, Karademir B, Yazgan B, Sozen E, Siow RCM, Mann GE, Ozer NK. Effects of vitamin E on peroxisome proliferator-activated receptor γ and nuclear factor-erythroid 2-related factor 2 in hypercholesterolemia-induced atherosclerosis. Free Radic Biol Med 2014; 70:174-81. [PMID: 24583459 DOI: 10.1016/j.freeradbiomed.2014.02.017] [Citation(s) in RCA: 64] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/12/2013] [Revised: 02/13/2014] [Accepted: 02/16/2014] [Indexed: 12/30/2022]
Abstract
Atherosclerosis and associated cardiovascular complications such as stroke and myocardial infarction are major causes of morbidity and mortality. We have previously reported a significant increase in mRNA levels of the scavenger receptor CD36 in aortae of cholesterol-fed rabbits and shown that vitamin E treatment attenuated increased CD36 mRNA expression. In the present study, we further investigated the redox signaling pathways associated with protection against atherogenesis induced by high dietary cholesterol and correlated these with CD36 expression and the effects of vitamin E supplementation in a rabbit model. Male albino rabbits were assigned to either a control group fed with a low vitamin E diet alone or a test group fed with a low vitamin E diet containing 2% cholesterol in the absence or presence of daily intramuscular injections of vitamin E (50mg/kg). To elucidate the mechanisms by which vitamin E supplementation alters the effects of hypercholesterolemia in rabbit aortae, we measured peroxisome proliferator-activated receptor γ (PPARγ), ATP-binding cassette transporter A1 (ABCA1), and matrix metalloproteinase-1 (MMP-1) mRNA levels by quantitative RT-PCR and the expression of MMP-1, nuclear factor-erythroid 2-related factor 2 (Nrf2), and glutathione S-transferase α (GSTα) protein by immunoblotting. The increased MMP-1 and decreased GSTα expression observed suggests that a cholesterol-rich diet contributes to the development of atherosclerosis, whereas vitamin E supplementation affords protection by decreasing MMP-1 and increasing PPARγ, GSTα, and ABCA1 levels in aortae of rabbits fed a cholesterol-rich diet. Notably, protein expression of Nrf2, the antioxidant transcription factor, was increased in both the cholesterol-fed and the vitamin E-supplemented groups. Although Nrf2 activation can promote CD36-mediated cholesterol uptake by macrophages, the increased induction of Nrf2-mediated antioxidant genes is likely to contribute to decreased lesion progression. Thus, our study demonstrates that Nrf2 can mediate both pro- and antiatherosclerotic effects.
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Affiliation(s)
- Perinur Bozaykut
- Department of Biochemistry, Faculty of Medicine, Genetic and Metabolic Diseases Research Center, Marmara University, 34668 Haydarpasa, Istanbul, Turkey
| | - Betul Karademir
- Department of Biochemistry, Faculty of Medicine, Genetic and Metabolic Diseases Research Center, Marmara University, 34668 Haydarpasa, Istanbul, Turkey
| | - Burak Yazgan
- Department of Biochemistry, Faculty of Medicine, Genetic and Metabolic Diseases Research Center, Marmara University, 34668 Haydarpasa, Istanbul, Turkey
| | - Erdi Sozen
- Department of Biochemistry, Faculty of Medicine, Genetic and Metabolic Diseases Research Center, Marmara University, 34668 Haydarpasa, Istanbul, Turkey
| | - Richard C M Siow
- Cardiovascular Division, British Heart Foundation Centre of Research Excellence, School of Medicine, King's College London, London SE1 9NH, UK
| | - Giovanni E Mann
- Cardiovascular Division, British Heart Foundation Centre of Research Excellence, School of Medicine, King's College London, London SE1 9NH, UK
| | - Nesrin Kartal Ozer
- Department of Biochemistry, Faculty of Medicine, Genetic and Metabolic Diseases Research Center, Marmara University, 34668 Haydarpasa, Istanbul, Turkey.
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22
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Lee BH, Hsu WH, Hsu YW, Pan TM. Suppression of dimerumic acid on hepatic fibrosis caused from carboxymethyl-lysine (CML) by attenuating oxidative stress depends on Nrf2 activation in hepatic stellate cells (HSCs). Food Chem Toxicol 2013; 62:413-9. [PMID: 24036144 DOI: 10.1016/j.fct.2013.09.007] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2013] [Revised: 09/03/2013] [Accepted: 09/06/2013] [Indexed: 12/23/2022]
Abstract
Hyperglycemia facilitates the formation of advanced glycation end-products (AGEs) in type-2 diabetes. Evidence indicates that carboxymethyl-lysine (CML) is highly prevalent in diabetes, resulting in hepatic fibrosis. The current study was designed to evaluate the effects of dimerumic acid (DMA) identified from Monascus-fermented products on receptor for AGEs (RAGE) signal and hepatic stellate cells (HSCs) activation by CML treatment. We found that DMA (50 μM) eliminated collagen generation, mRNA expressions of α-smooth muscle actin (α-SMA), platelet-derived growth factor-β receptor (PDGF-βR), and procollagen 1a1 (proCol-1a1) in CML (100 μg/ml)-treated HSCs, and these effects were similar to allyl isothiocyanate (AITC; 50 μM). In addition, the suppression of α-SMA, PDGF-βR, proCol-1a1 by DMA were abolished while nuclear factor-erythroid 2-related factor 2 (Nrf2) silence in CML-treated HSCs. These findings suggested that DMA and AITC increased Nrf2 and glutamate-cysteine ligase (GCL) activities thereby inhibiting oxidative stress caused by CML and showing anti-fibrogentic effect in HSCs.
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Affiliation(s)
- Bao-Hong Lee
- Department of Biochemical Science & Technology, College of Life Science, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan
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23
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Lee BH, Hsu WH, Hsu YW, Pan TM. Dimerumic acid attenuates receptor for advanced glycation endproducts signal to inhibit inflammation and diabetes mediated by Nrf2 activation and promotes methylglyoxal metabolism into d-lactic acid. Free Radic Biol Med 2013; 60:7-16. [PMID: 23434766 DOI: 10.1016/j.freeradbiomed.2013.01.030] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/11/2012] [Revised: 11/13/2012] [Accepted: 01/29/2013] [Indexed: 12/17/2022]
Abstract
This study was designed to evaluate the effects of dimerumic acid (DMA) on receptor for advanced glycation endproducts (RAGE) signal activation and THP-1 monocyte inflammation treated with S100b, a specific ligand of RAGE. We found that DMA inhibited inflammatory cytokine production via upregulation of nuclear factor-erythroid 2-related factor 2 (Nrf2) and alleviated oxidative stress through attenuation of p47phox translocation to the membrane of S100b-treated THP-1 monocytes. We found that DMA activated Nrf2 mediated by the p38 kinase pathway in THP-1 monocytes. However, anti-inflammatory activity of DMA was attenuated by Nrf2 siRNA treatment. In an animal model, methylglyoxal (MG; 200mg/kg bw) was chosen to induce diabetes in Balb/C mice (6 weeks) in this work. The in vivo verification of anti-inflammation in peripheral blood mononuclear cells by DMA treatment was confirmed by tumor necrosis factor-α and interleukin-1β measurements. Oral glucose tolerance test, insulin tolerance test, hyperinsulinemia, and hyperglycemia were improved in MG-treated mice by DMA treatment and these effects were greater than those of silymarin and N-acetylcysteine. Furthermore, DMA increased hepatic glyoxalase mRNA and glutathione mediated by Nrf2 activation to metabolize MG into d-lactic acid, thereby reducing serum and hepatic AGE levels and suppressing inflammatory factor generation in MG-treated mice. However, DMA did not exert the antiglycation activity in MG-bovine serum albumin incubation. Taken together, the results indicate that DMA is a novel antioxidant and Nrf2 activator that lowers AGE levels and may prove to be an effective treatment for diabetes.
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Affiliation(s)
- Bao-Hong Lee
- Department of Biochemical Science & Technology, College of Life Science, National Taiwan University, Taipei 10617, Taiwan
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24
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Haskew-Layton RE, Payappilly JB, Xu H, Bennett SAL, Ratan RR. 15-Deoxy-Δ12,14-prostaglandin J2 (15d-PGJ2) protects neurons from oxidative death via an Nrf2 astrocyte-specific mechanism independent of PPARγ. J Neurochem 2013. [DOI: 10.1111/jnc.12107] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Renée E. Haskew-Layton
- The Burke Medical Research Institute; Department of Neurology and Neuroscience; Weill Medical College of Cornell University; White Plains New York USA
| | - Jimmy B. Payappilly
- The Burke Medical Research Institute; Department of Neurology and Neuroscience; Weill Medical College of Cornell University; White Plains New York USA
| | - Hongbin Xu
- Neural Regeneration Laboratory and Ottawa Institute of Systems Biology and Department of Biochemistry, Microbiology, and Immunology; University of Ottawa; Ottawa Canada
| | - Steffany A. L. Bennett
- Neural Regeneration Laboratory and Ottawa Institute of Systems Biology and Department of Biochemistry, Microbiology, and Immunology; University of Ottawa; Ottawa Canada
| | - Rajiv R. Ratan
- The Burke Medical Research Institute; Department of Neurology and Neuroscience; Weill Medical College of Cornell University; White Plains New York USA
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25
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Qin S, Chen J, Tanigawa S, Hou DX. Microarray and pathway analysis highlight Nrf2/ARE-mediated expression profiling by polyphenolic myricetin. Mol Nutr Food Res 2012; 57:435-46. [PMID: 23281314 DOI: 10.1002/mnfr.201200563] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2012] [Revised: 10/16/2012] [Accepted: 10/29/2012] [Indexed: 12/30/2022]
Abstract
SCOPE Myricetin is a dietary flavonol and widely distributed in many edible plants. It has been reported to have many bioactivities and considered as a promising chemopreventive compound. The present study aimed to investigate the influences of myricetin on gene expressions in genome-wide and underlying mechanisms. METHODS AND RESULTS Among total 44K gene probes, myricetin treatment upregulated the signals of 143 gene probes (0.33% of total probes) and downregulated signals of 476 gene probes (1.08% of total probes) by greater than or equal to twofold in HepG2 cells. The network pathway analysis revealed that nuclear factor (erythroid-derived 2)-like 2 (Nrf2)-mediated antioxidant response element (ARE) activation is involved in myricetin-induced genes expressions. Molecular data revealed that myricetin activated Nrf2-ARE pathway by inhibiting Nrf2 ubiquitination and protein turnover, stimulating Nrf2 expression and kelch-like erythroid cell-derived protein with CNC homology (ECH)-associated protein 1 modification. All of these events finally increased nuclear Nrf2 accumulation and ARE-binding activity to enhance ARE-mediated genes expressions. Additionally, treatment with Nrf2 small interfering RNA attenuated the myricetin-induced ARE activity and gene expression. CONCLUSION An Nrf2-mediated ARE activation is involved in myricetin-induced expression profiling in hepatic cells.
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Affiliation(s)
- Si Qin
- Course of Biological Science and Technology, United Graduate School of Agricultural Sciences, Kagoshima University, Korimoto, Kagoshima, Japan
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26
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Lee BH, Hsu WH, Chang YY, Kuo HF, Hsu YW, Pan TM. Ankaflavin: a natural novel PPARγ agonist upregulates Nrf2 to attenuate methylglyoxal-induced diabetes in vivo. Free Radic Biol Med 2012; 53:2008-16. [PMID: 23022408 DOI: 10.1016/j.freeradbiomed.2012.09.025] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/21/2012] [Revised: 08/04/2012] [Accepted: 09/15/2012] [Indexed: 12/15/2022]
Abstract
Ankaflavin (AK) is an active compound having anti-inflammatory, anti-cancer, antiatherosclerotic, and hypolipidemic effects. We have previously reported that AK acts as an antioxidant and antidiabetic drug; however, the mechanism by which AK prevents diabetes remains unknown. Hyperglycemia is associated with protein glycation, which produces advanced glycation end-products (AGEs). Methylglyoxal (MG)-a metabolite of carbohydrates-is believed to cause insulin resistance by inducing inflammation and pancreas damage. In this work, diabetes was induced in Wistar rats (4 weeks of age) by treating them with MG (600 mg/kg bw) for 4 weeks. We observed that AK (10mg/kg bw) exerted peroxisome proliferator-activated receptor-γ (PPARγ) agonist activity, thereby enhancing insulin sensitivity (as indicated by hepatic GLUT2 translocation, PTP1B suppression, and glucose uptake) by downregulating blood glucose and upregulating pancreatic and duodenal homeobox-1 and Maf-A expression and increasing insulin production in MG-induced rats. However, these effects were abolished by the administration of GW9662 (PPARγ antagonist), but the expression of hepatic heme oxygenase-1 (HO-1) and glutamate-cysteine ligase (GCL) was not suppressed in MG-induced rats. Therefore, the nuclear factor erythroid-related factor-2 (Nrf2) activation was investigated. AK did not affect hepatic Nrf2 mRNA or protein expression but significantly increased Nrf2 phosphorylation (serine 40), which was accompanied by increased transcriptional activation of hepatic HO-1 and GCL. These data indicated that AK protected rats from oxidative stress resulting from MG-induced insulin resistance. In contrast, these effects were not detected when the rats were treated with the antidiabetic drug rosiglitazone (10mg/kg bw). Moreover, we found that AK did not inhibit the generation of AGEs in vitro; however, the glutathione (GSH) levels in liver and pancreas of MG-induced rats were elevated in rats administered AK. Therefore, we believe that GSH may lower the MG level, which attenuates the formation of AGEs in the serum, kidney, liver, and pancreas of MG-induced rats. We also found that AK treatment reduced the production of inflammatory factors, such as tumor necrosis factor-α and interleukin-1β. Taken together, the results of our mechanistic study of MG-induced rats suggest that the protective effects of AK against diabetes are mediated by the upregulation of the signaling pathway of Nrf2, which enhances antioxidant activity and serves as a PPARγ agonist to enhance insulin sensitivity.
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MESH Headings
- Anilides/pharmacology
- Animals
- Anti-Inflammatory Agents/pharmacology
- Anti-Inflammatory Agents/therapeutic use
- Blood Glucose
- Cytokines/metabolism
- Diabetes Mellitus, Experimental/blood
- Diabetes Mellitus, Experimental/drug therapy
- Flavins/pharmacology
- Flavins/therapeutic use
- Gene Expression/drug effects
- Gene Expression Regulation
- Glycation End Products, Advanced/blood
- Glycation End Products, Advanced/metabolism
- Heme Oxygenase-1/genetics
- Heme Oxygenase-1/metabolism
- Hypoglycemic Agents/pharmacology
- Hypoglycemic Agents/therapeutic use
- Insulin/blood
- Insulin Resistance
- Leukocytes, Mononuclear/drug effects
- Leukocytes, Mononuclear/metabolism
- Liver/drug effects
- Liver/enzymology
- Liver/physiopathology
- Male
- NF-E2-Related Factor 2/genetics
- NF-E2-Related Factor 2/metabolism
- Oxidative Stress/drug effects
- PPAR gamma/agonists
- PPAR gamma/antagonists & inhibitors
- PPAR gamma/metabolism
- Pancreas/drug effects
- Pancreas/metabolism
- Pancreas/physiopathology
- Phosphorylation
- Protein Processing, Post-Translational
- Pyruvaldehyde
- Rats
- Rats, Wistar
- Receptor for Advanced Glycation End Products
- Receptors, Immunologic/genetics
- Receptors, Immunologic/metabolism
- Up-Regulation/drug effects
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Affiliation(s)
- Bao-Hong Lee
- Department of Biochemical Science & Technology, College of Life Science, National Taiwan University, Taipei 10617, Taiwan
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