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Lyu Q, Chen RA, Chuang HL, Zou HB, Liu L, Sung LK, Liu PY, Wu HY, Chang HY, Cheng WJ, Wu WK, Wu MS, Hsu CC. Bifidobacterium alleviate metabolic disorders via converting methionine to 5'-methylthioadenosine. Gut Microbes 2024; 16:2300847. [PMID: 38439565 PMCID: PMC10936671 DOI: 10.1080/19490976.2023.2300847] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/01/2023] [Accepted: 12/27/2023] [Indexed: 03/06/2024] Open
Abstract
Dietary patterns and corresponding gut microbiota profiles are associated with various health conditions. A diet rich in polyphenols, primarily plant-based, has been shown to promote the growth of probiotic bacteria in the gastrointestinal tract, subsequently reducing the risk of metabolic disorders in the host. The beneficial effects of these bacteria are largely due to the specific metabolites they produce, such as short-chain fatty acids and membrane proteins. In this study, we employed a metabolomics-guided bioactive metabolite identification platform that included bioactivity testing using in vitro and in vivo assays to discover a bioactive metabolite produced from probiotic bacteria. Through this approach, we identified 5'-methylthioadenosine (MTA) as a probiotic bacterial-derived metabolite with anti-obesity properties. Furthermore, our findings indicate that MTA administration has several regulatory impacts on liver functions, including modulating fatty acid synthesis and glucose metabolism. The present study elucidates the intricate interplay between dietary habits, gut microbiota, and their resultant metabolites.
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Affiliation(s)
- Qiang Lyu
- Department of Chemistry, National Taiwan University, Taipei, Taiwan
| | - Rou-An Chen
- Department of Chemistry, National Taiwan University, Taipei, Taiwan
- Leeuwenhoek Laboratories Co. Ltd, Taipei, Taiwan
| | - Hsiao-Li Chuang
- National Laboratory Animal Center, National Applied Research Laboratories Research Institute, Taipei, Taiwan
| | - Hsin-Bai Zou
- Department of Chemistry, National Taiwan University, Taipei, Taiwan
- Leeuwenhoek Laboratories Co. Ltd, Taipei, Taiwan
| | - Lihong Liu
- Institute of Molecular Biology, Academia Sinica, Taipei, Taiwan
| | - Li-Kang Sung
- Department of Chemistry, National Taiwan University, Taipei, Taiwan
| | - Po-Yu Liu
- Department of Internal Medicine, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Hsin-Yi Wu
- Department of Chemistry, National Taiwan University, Taipei, Taiwan
| | - Hsin-Yuan Chang
- Department of Chemistry, National Taiwan University, Taipei, Taiwan
| | - Wan-Ju Cheng
- Department of Chemistry, National Taiwan University, Taipei, Taiwan
| | - Wei-Kai Wu
- Department of Internal Medicine, College of Medicine, National Taiwan University, Taipei, Taiwan
- Department of Medical Research, National Taiwan University Hospital, Taipei, Taiwan
| | - Ming-Shiang Wu
- Department of Internal Medicine, College of Medicine, National Taiwan University, Taipei, Taiwan
- Department of Internal Medicine, National Taiwan University Hospital, Taipei, Taiwan
| | - Cheng-Chih Hsu
- Department of Chemistry, National Taiwan University, Taipei, Taiwan
- Leeuwenhoek Laboratories Co. Ltd, Taipei, Taiwan
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Chen K, Tang L, Nong X. Artesunate targets cellular metabolism to regulate the Th17/Treg cell balance. Inflamm Res 2023; 72:1037-1050. [PMID: 37024544 DOI: 10.1007/s00011-023-01729-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Revised: 03/26/2023] [Accepted: 03/29/2023] [Indexed: 04/08/2023] Open
Abstract
INTRODUCTION Metabolic reprogramming is one of the important mechanisms of cell differentiation, and different cells have different preferences for energy sources. During the differentiation of naive CD4 + T cells into Th17 and Treg cells, these cells show specific energy metabolism characteristics. Th17 cells depend on enhanced glycolysis, fatty acid synthesis, and glutaminolysis. In contrast, Treg cells are dependent on oxidative phosphorylation, fatty acid oxidation, and amino acid depletion. As a potent antimalarial drug, artesunate has been shown to modulate the Th17/Treg imbalance and regulate cell metabolism. METHODOLOGY Relevant literatures on ART, cellular metabolism, glycolysis, lipid metabolism, amino acid metabolism, CD4 + T cells, Th17 cells, and Treg cells published from January 1, 2010 to now were searched in PubMed database. CONCLUSION In this review, we will highlight recent advances in which artesunate can restore the Th17/Treg imbalance in disease states by altering T-cell metabolism to influence differentiation and lineage selection. Data from the current study show that few studies have focused on the effect of ART on cellular metabolism. ART can affect the metabolic characteristics of T cells (glycolysis, lipid metabolism, and amino acid metabolism) and interfere with their differentiation lineage, thereby regulating the balance of Th17/Treg and alleviating the symptoms of the disease.
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Affiliation(s)
- Kun Chen
- College of Stomatology, Hospital of Stomatology, Guangxi Medical University, Nanning, Guangxi, China
| | - Liying Tang
- College of Stomatology, Hospital of Stomatology, Guangxi Medical University, Nanning, Guangxi, China
| | - Xiaolin Nong
- College of Stomatology, Hospital of Stomatology, Guangxi Medical University, Nanning, Guangxi, China.
- Guangxi Key Laboratory of Oral and Maxillofacial Rehabilitation and Reconstruction, Guangxi Medical University, Nanning, 530021, Guangxi, China.
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Xu Z, Yang H, Li X, Xu X, Tan H, Leng X. Dietary effects of aucubin on growth and flesh quality of grass carp (Ctenopharyngodon idellus) based on metabolomics. J Anim Sci 2022; 100:skac273. [PMID: 35985277 PMCID: PMC9615150 DOI: 10.1093/jas/skac273] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2022] [Accepted: 08/18/2022] [Indexed: 11/13/2022] Open
Abstract
This aim of this study was to investigate the effects of dietary aucubin on the growth, flesh quality, and metabolomics of grass carp (Ctenopharyngodon idella). Five diets were designed with the aucubin inclusion of 0 (control diet), 0.2, 0.4, 0.6, and 0.8 g/kg (Auc-0.2, Auc-0.4, Auc-0.6, Auc-0.8) and were fed to grass carp with an initial body weight of 17.0 ± 0.2 g for 60 d. The results indicated that dietary aucubin did not significantly affect the growth performance of grass carp (P > 0.05). Compared to the control, dietary supplementation with 0.2 to 0.8 g/kg aucubin increased flesh hardness, chewiness, the activities of superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPx), and the contents of total free amino acids (TFAA) and n-3 polyunsaturated fatty acids (n-3 PUFA) (P < 0.05). The contents of malondialdehyde (MDA) and lactic acid (LD) in the flesh were significantly decreased by the addition of 0.4 to 0.6 g/kg aucubin and by the addition of 0.6 to 0.8 g/kg aucubin (P < 0.05), respectively, while the content of delicious amino acids (DAA) was significantly enhanced by the addition of 0.4 to 0.8 g/kg aucubin (P < 0.05). Moreover, the contents of collagen and C22:6n3 (DHA) in the flesh of the Auc-0.8 group were significantly higher than those of the control (P < 0.05). In the metabolomics profiling of flesh, 133 and 135 named differential metabolites were identified in the Auc-0.4 and Auc-0.8 groups, respectively, compared to the control, and these metabolites were found to be involved in the second-grade pathways of "lipid metabolism" and "amino acid metabolism". Regarding gene expression, the mRNA levels of CuZn-SOD, CAT, COL1A1, COL1A2, Smad4, and FAS in flesh were upregulated in the Auc-0.4 and Auc-0.8 groups, and the expression levels of GPx, Nrf2, and TGF-β1 mRNA were also upregulated in the Auc-0.8 group (P < 0.05). In summary, dietary aucubin did not promote growth, but improved the flesh quality of grass carp, which might be associated with the TGF-β/Smad and Nrf2 pathways. The recommended supplementation level of aucubin in the diet of grass carp was 0.6 to 0.8 g/kg.
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Affiliation(s)
- Zhen Xu
- National Demonstration Center for Experimental Fisheries Science Education, Shanghai Ocean University, Shanghai 201306, China
- Centre for Research on Environmental Ecology and Fish Nutrition (CREEFN) of the Ministry of Agriculture, Shanghai Ocean University, Shanghai 201306, China
- Shanghai Collaborative Innovation for Aquatic Animal Genetics and Breeding, Shanghai Ocean University, Shanghai 201306, China
| | - Hang Yang
- National Demonstration Center for Experimental Fisheries Science Education, Shanghai Ocean University, Shanghai 201306, China
- Centre for Research on Environmental Ecology and Fish Nutrition (CREEFN) of the Ministry of Agriculture, Shanghai Ocean University, Shanghai 201306, China
- Shanghai Collaborative Innovation for Aquatic Animal Genetics and Breeding, Shanghai Ocean University, Shanghai 201306, China
| | - Xiaoqin Li
- National Demonstration Center for Experimental Fisheries Science Education, Shanghai Ocean University, Shanghai 201306, China
- Centre for Research on Environmental Ecology and Fish Nutrition (CREEFN) of the Ministry of Agriculture, Shanghai Ocean University, Shanghai 201306, China
- Shanghai Collaborative Innovation for Aquatic Animal Genetics and Breeding, Shanghai Ocean University, Shanghai 201306, China
| | - Xiaoying Xu
- National Demonstration Center for Experimental Fisheries Science Education, Shanghai Ocean University, Shanghai 201306, China
- Centre for Research on Environmental Ecology and Fish Nutrition (CREEFN) of the Ministry of Agriculture, Shanghai Ocean University, Shanghai 201306, China
- Shanghai Collaborative Innovation for Aquatic Animal Genetics and Breeding, Shanghai Ocean University, Shanghai 201306, China
| | - Hongxin Tan
- National Demonstration Center for Experimental Fisheries Science Education, Shanghai Ocean University, Shanghai 201306, China
- Centre for Research on Environmental Ecology and Fish Nutrition (CREEFN) of the Ministry of Agriculture, Shanghai Ocean University, Shanghai 201306, China
- Shanghai Collaborative Innovation for Aquatic Animal Genetics and Breeding, Shanghai Ocean University, Shanghai 201306, China
| | - Xiangjun Leng
- National Demonstration Center for Experimental Fisheries Science Education, Shanghai Ocean University, Shanghai 201306, China
- Centre for Research on Environmental Ecology and Fish Nutrition (CREEFN) of the Ministry of Agriculture, Shanghai Ocean University, Shanghai 201306, China
- Shanghai Collaborative Innovation for Aquatic Animal Genetics and Breeding, Shanghai Ocean University, Shanghai 201306, China
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Guerrero L, Paradela A, Corrales FJ. Targeted Proteomics for Monitoring One-Carbon Metabolism in Liver Diseases. Metabolites 2022; 12:metabo12090779. [PMID: 36144184 PMCID: PMC9501948 DOI: 10.3390/metabo12090779] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2022] [Revised: 08/18/2022] [Accepted: 08/19/2022] [Indexed: 11/16/2022] Open
Abstract
Liver diseases cause approximately 2 million deaths per year worldwide and had an increasing incidence during the last decade. Risk factors for liver diseases include alcohol consumption, obesity, diabetes, the intake of hepatotoxic substances like aflatoxin, viral infection, and genetic determinants. Liver cancer is the sixth most prevalent cancer and the third in mortality (second in males). The low survival rate (less than 20% in 5 years) is partially explained by the late diagnosis, which remarks the need for new early molecular biomarkers. One-carbon metabolism integrates folate and methionine cycles and participates in essential cell processes such as redox homeostasis maintenance and the regulation of methylation reactions through the production of intermediate metabolites such as cysteine and S-Adenosylmethionine. One-carbon metabolism has a tissue specific configuration, and in the liver, the participating enzymes are abundantly expressed—a requirement to maintain hepatocyte differentiation. Targeted proteomics studies have revealed significant differences in hepatocellular carcinoma and cirrhosis, suggesting that monitoring one-carbon metabolism enzymes can be useful for stratification of liver disease patients and to develop precision medicine strategies for their clinical management. Here, reprogramming of one-carbon metabolism in liver diseases is described and the role of mass spectrometry to follow-up these alterations is discussed.
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Affiliation(s)
- Laura Guerrero
- Centro Nacional de Biotecnología (CNB), CSIC. C/Darwin 3, 28049 Madrid, Spain
| | - Alberto Paradela
- Centro Nacional de Biotecnología (CNB), CSIC. C/Darwin 3, 28049 Madrid, Spain
| | - Fernando J. Corrales
- Centro Nacional de Biotecnología (CNB), CSIC. C/Darwin 3, 28049 Madrid, Spain
- National Institute for the Study of Liver and Gastrointestinal Diseases (CIBERehd, Carlos III Health Institute), 28029 Madrid, Spain
- Correspondence: ; Tel.: +34-91-585-46-96
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Glycogen Storage Disease Phenotypes Accompanying the Perturbation of the Methionine Cycle in NDRG3-Deficient Mouse Livers. Cells 2022; 11:cells11091536. [PMID: 35563842 PMCID: PMC9103136 DOI: 10.3390/cells11091536] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2022] [Revised: 04/29/2022] [Accepted: 04/29/2022] [Indexed: 02/01/2023] Open
Abstract
N-Myc downstream regulated gene 3 (NDRG3) is a unique pro-tumorigenic member among NDRG family genes, mediating growth signals. Here, we investigated the pathophysiological roles of NDRG3 in relation to cell metabolism by disrupting its functions in liver. Mice with liver-specific KO of NDRG3 (Ndrg3 LKO) exhibited glycogen storage disease (GSD) phenotypes including excessive hepatic glycogen accumulation, hypoglycemia, elevated liver triglyceride content, and several signs of liver injury. They suffered from impaired hepatic glucose homeostasis, due to the suppression of fasting-associated glycogenolysis and gluconeogenesis. Consistently, the expression of glycogen phosphorylase (PYGL) and glucose-6-phosphate transporter (G6PT) was significantly down-regulated in an Ndrg3 LKO-dependent manner. Transcriptomic and metabolomic analyses revealed that NDRG3 depletion significantly perturbed the methionine cycle, redirecting its flux towards branch pathways to upregulate several metabolites known to have hepatoprotective functions. Mechanistically, Ndrg3 LKO-dependent downregulation of glycine N-methyltransferase in the methionine cycle and the resultant elevation of the S-adenosylmethionine level appears to play a critical role in the restructuring of the methionine metabolism, eventually leading to the manifestation of GSD phenotypes in Ndrg3 LKO mice. Our results indicate that NDRG3 is required for the homeostasis of liver cell metabolism upstream of the glucose–glycogen flux and methionine cycle and suggest therapeutic values for regulating NDRG3 in disorders with malfunctions in these pathways.
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Mohamed EI, El-Ghnam SM, Bayoumi AM, Abdel-Mageed SM, Ghareeb DA, Ross B. Electronic nose versus quadrupole mass spectrometry for identifying viral hepatitis C patients. J Viral Hepat 2022; 29:147-155. [PMID: 34773341 DOI: 10.1111/jvh.13630] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/02/2021] [Revised: 10/13/2021] [Accepted: 11/02/2021] [Indexed: 12/12/2022]
Abstract
Hepatitis C is a leading cause of liver disease and transplantation and is a significant burden on public health worldwide. This study aimed to apply the Electronic Nose (E-Nose) and quadrupole Mass Spectrometry (MS/MS) technologies for screening blood samples from hepatitis C patients and healthy controls. We analysed volatile organic compounds (VOCs) in the headspace over blood samples to identify those VOCs characteristic for diagnosing hepatitis C patients. The study comprised 150 acute hepatitis C patients with age range: 24-59 years, and mean age ±SD: 41.5 ± 12.8 years and 150 age-matched healthy controls (age range: 24-51 and mean age: 40.11 ± 4.89 years) from the Hospital of the Medical Research Institute, Alexandria University, Alexandria, Egypt. Collected blood samples were analysed qualitatively and quantitatively using the E-Nose and MS/MS techniques, respectively. Principal component analysis of the E-Nose 10-sensor responses accurately classified blood samples from hepatitis C patients and healthy controls. The first two principal components explained over 98.35% of the variance in signals with no false-positive (healthy controls) or false-negative (hepatitis C patients) results. MS/MS showed two fragmentation ions at m/z of 104 and 151 Da with the positive electrospray ionization mode (ESI+) in blood samples for hepatitis C patients, but not for healthy controls or background water samples. We identified the two specific fragmentation ions at m/z 104 and m/z 151 Da as malonic acid (MF: C3 H4 O4 ; MW: 104.06 g/mol) and monosaccharide pentose (MF: C5 H10 O5 ; MW: 150.13 g/mol) in VOCs of the headspace over blood samples for hepatitis C patients. This provides a rationale for developing diagnostic tests for hepatitis C virus based on altered trace VOCs concentrations using the relatively inexpensive, easy-to-use, portable and non-invasive E-Nose technology.
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Affiliation(s)
- Ehab I Mohamed
- Department of Medical Biophysics, Medical Research Institute, Alexandria University, Alexandria, Egypt
| | - Sameh M El-Ghnam
- Department of Physics, Faculty of Science, Alexandria University, Alexandria, Egypt
| | - Amani M Bayoumi
- Department of Physics, Faculty of Science, Alexandria University, Alexandria, Egypt
| | - Samir M Abdel-Mageed
- Department of Physics, Faculty of Science, Alexandria University, Alexandria, Egypt
| | - Doaa A Ghareeb
- Department of Biochemistry, Faculty of Science, Alexandria University, Alexandria, Egypt.,Pre-Clinical Center, Scientific Research and Technology Applications City, Borg Al-Arab, Alexandria, Egypt
| | - Brian Ross
- Northern Ontario School of Medicine, Lakehead University, Ontario, Canada
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Pascale RM, Simile MM, Calvisi DF, Feo CF, Feo F. S-Adenosylmethionine: From the Discovery of Its Inhibition of Tumorigenesis to Its Use as a Therapeutic Agent. Cells 2022; 11:cells11030409. [PMID: 35159219 PMCID: PMC8834208 DOI: 10.3390/cells11030409] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2021] [Revised: 01/10/2022] [Accepted: 01/14/2022] [Indexed: 02/07/2023] Open
Abstract
Alterations of methionine cycle in steatohepatitis, cirrhosis, and hepatocellular carcinoma induce MAT1A decrease and MAT2A increase expressions with the consequent decrease of S-adenosyl-L-methionine (SAM). This causes non-alcoholic fatty liver disease (NAFLD). SAM administration antagonizes pathological conditions, including galactosamine, acetaminophen, and ethanol intoxications, characterized by decreased intracellular SAM. Positive therapeutic effects of SAM/vitamin E or SAM/ursodeoxycholic acid in animal models with NAFLD and intrahepatic cholestasis were not confirmed in humans. In in vitro experiments, SAM and betaine potentiate PegIFN-alpha-2a/2b plus ribavirin antiviral effects. SAM plus betaine improves early viral kinetics and increases interferon-stimulated gene expression in patients with viral hepatitis non-responders to pegIFNα/ribavirin. SAM prevents hepatic cirrhosis, induced by CCl4, inhibits experimental tumors growth and is proapoptotic for hepatocellular carcinoma and MCF-7 breast cancer cells. SAM plus Decitabine arrest cancer growth and potentiate doxorubicin effects on breast, head, and neck cancers. Furthermore, SAM enhances the antitumor effect of gemcitabine against pancreatic cancer cells, inhibits growth of human prostate cancer PC-3, colorectal cancer, and osteosarcoma LM-7 and MG-63 cell lines; increases genomic stability of SW480 cells. SAM reduces colorectal cancer progression and inhibits the proliferation of preneoplastic rat liver cells in vivo. The discrepancy between positive results of SAM treatment of experimental tumors and modest effects against human disease may depend on more advanced human disease stage at moment of diagnosis.
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Affiliation(s)
- Rosa M. Pascale
- Department of Medical, Surgical and Experimental Sciences, Division of Experimental Pathology and Oncology, University of Sassari, 07100 Sassari, Italy; (M.M.S.); (D.F.C.); (F.F.)
- Correspondence:
| | - Maria M. Simile
- Department of Medical, Surgical and Experimental Sciences, Division of Experimental Pathology and Oncology, University of Sassari, 07100 Sassari, Italy; (M.M.S.); (D.F.C.); (F.F.)
| | - Diego F. Calvisi
- Department of Medical, Surgical and Experimental Sciences, Division of Experimental Pathology and Oncology, University of Sassari, 07100 Sassari, Italy; (M.M.S.); (D.F.C.); (F.F.)
| | - Claudio F. Feo
- Department of Medical, Surgical and Experimental Sciences, Division of Surgery, University of Sassari, 07100 Sassari, Italy;
| | - Francesco Feo
- Department of Medical, Surgical and Experimental Sciences, Division of Experimental Pathology and Oncology, University of Sassari, 07100 Sassari, Italy; (M.M.S.); (D.F.C.); (F.F.)
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Ranade AS, Bertino JR, Hu L. Design, synthesis, and evaluation of potential carbamate prodrugs of 5′-methylthioadenosine (MTA). Med Chem Res 2021. [DOI: 10.1007/s00044-021-02730-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Liu F, Wang X, Duan C, Zhang J, Li X. Hepatoxicity mechanism of cantharidin-induced liver LO2 cells by LC-MS metabolomics combined traditional approaches. Toxicol Lett 2020; 333:49-61. [PMID: 32726682 DOI: 10.1016/j.toxlet.2020.07.024] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2020] [Revised: 07/18/2020] [Accepted: 07/24/2020] [Indexed: 12/11/2022]
Abstract
Hepatotoxicity induced by Mylabris has been reported in both clinical and animal experiments. Cantharidin (CTD), the main active compound of Mylabris was responsible for the hepatotoxicity, which aroused widespread concern. However, the mechanism of CTD hepatotoxicity remained unclear. In this study, LO2 cells were exposed to two doses of CTD (6.25 and 25 μM) for 12 h, the levels of alanine aminotransferase (ALT), aspartate aminotransferase (AST) and lactate dehydrogenase (LDH) were measured. The metabolites in LO2 cells were profiled by LC-MS. Partial least squares discriminant analysis and orthogonal partial least squares discriminant analysis were used for screening potential biomarkers. The MetPA software was used for clustering and pathway analysis. Network pharmacology was used to predict the genes acted with potential biomarkers. Compared with the control group, the levels of ALT, AST, and LDH was significantly increased after CTD treatment. A total of 46 potential biomarkers for hepatotoxicity induced by CTD were identified. And downregulated potential biomarkers reflected the inhibitory effects of CTD toxicity on metabolism of LO2. Moreover, CTD-induced liver toxicity of LO2 cells is mainly related to three pathways: cysteine and methionine metabolism; glutathione metabolism; and glycine, serine, and threonine metabolism. Furtherly, the mRNA expression of CES2, DNMT1, NOS1, NOS3, S1PR2, and CES1 screened by network pharmacology were regulated by CTD. These studies provide valuable mechanistic insights into CTD-associated hepatotoxicity that will aid in the development of therapeutic prevention and treatment options for this liver disease.
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Affiliation(s)
- Fang Liu
- Basic Medical School, Zunyi Medical University, Zunyi, Guizhou, China
| | - Xiaoning Wang
- School of pharmacy, Zunyi Medical University, Zunyi, Guizhou, China
| | - Cancan Duan
- Key Laboratory of Basic Pharmacology of Ministry of Education and Joint International Research Laboratory of Ethnomedicine of Ministry of Education, Zunyi Medical University, Zunyi, Guizhou, China
| | - Jianyong Zhang
- School of pharmacy, Zunyi Medical University, Zunyi, Guizhou, China; Key Laboratory of Basic Pharmacology of Ministry of Education and Joint International Research Laboratory of Ethnomedicine of Ministry of Education, Zunyi Medical University, Zunyi, Guizhou, China.
| | - Xiaofei Li
- Basic Medical School, Zunyi Medical University, Zunyi, Guizhou, China.
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Cellular Metabolomics Reveal the Mechanism Underlying the Anti-Atherosclerotic Effects of Aspirin Eugenol Ester on Vascular Endothelial Dysfunction. Int J Mol Sci 2019; 20:ijms20133165. [PMID: 31261711 PMCID: PMC6651823 DOI: 10.3390/ijms20133165] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2019] [Accepted: 06/26/2019] [Indexed: 01/29/2023] Open
Abstract
Aspirin eugenol ester (AEE) possesses anti-thrombotic, anti-atherosclerotic and anti-oxidative effects. The study aims to clarify the mechanism underlying the anti-atherosclerotic effects of AEE on vascular endothelial dysfunction. Both the high-fat diet (HFD)-induced atherosclerotic rat model and the H2O2-induced human umbilical vein endothelial cells (HUVECs) model were used to investigate the effects of AEE on vascular endothelial dysfunction. UPLC/QTOF-MS coupled with a multivariate data analysis method were used to profile the variations in the metabolites of HUVECs in response to different treatments. Pretreatment of HUVECs with AEE significantly ameliorated H2O2-induced apoptosis, the overexpression of E-selectin and VCAM-1, and the adhesion of THP-1 cells. Putative endogenous biomarkers associated with the inhibition of endothelial dysfunction were identified in HUVECs pretreated with AEE in the absence or presence of H2O2, and these biomarkers were involved in important metabolic pathways, including amino acid metabolism, carbohydrate metabolism, and glutathione metabolism. Moreover, in vivo, AEE also significantly reduced vascular endothelial dysfunction and decreased the overexpression of VCAM-1 and E-selectin. Based on our findings, the mechanism underlying the anti-atherosclerotic effects of AEE might be related to a reduction in vascular endothelial dysfunction mediated by ameliorating alterations in metabolism, inhibiting oxidative stress, and decreasing the expression of adhesion molecules.
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Pascale RM, Peitta G, Simile MM, Feo F. Alterations of Methionine Metabolism as Potential Targets for the Prevention and Therapy of Hepatocellular Carcinoma. ACTA ACUST UNITED AC 2019; 55:medicina55060296. [PMID: 31234428 PMCID: PMC6631235 DOI: 10.3390/medicina55060296] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2019] [Revised: 05/28/2019] [Accepted: 05/29/2019] [Indexed: 12/12/2022]
Abstract
Several researchers have analyzed the alterations of the methionine cycle associated with liver disease to clarify the pathogenesis of human hepatocellular carcinoma (HCC) and improve the preventive and the therapeutic approaches to this tumor. Different alterations of the methionine cycle leading to a decrease of S-adenosylmethionine (SAM) occur in hepatitis, liver steatosis, liver cirrhosis, and HCC. The reproduction of these changes in MAT1A-KO mice, prone to develop hepatitis and HCC, demonstrates the pathogenetic role of MAT1A gene under-regulation associated with up-regulation of the MAT2A gene (MAT1A:MAT2A switch), encoding the SAM synthesizing enzymes, methyladenosyltransferase I/III (MATI/III) and methyladenosyltransferase II (MATII), respectively. This leads to a rise of MATII, inhibited by the reaction product, with a consequent decrease of SAM synthesis. Attempts to increase the SAM pool by injecting exogenous SAM have beneficial effects in experimental alcoholic and non-alcoholic steatohepatitis and hepatocarcinogenesis. Mechanisms involved in hepatocarcinogenesis inhibition by SAM include: (1) antioxidative effects due to inhibition of nitric oxide (NO•) production, a rise in reduced glutathione (GSH) synthesis, stabilization of the DNA repair protein Apurinic/Apyrimidinic Endonuclease 1 (APEX1); (2) inhibition of c-myc, H-ras, and K-ras expression, prevention of NF-kB activation, and induction of overexpression of the oncosuppressor PP2A gene; (3) an increase in expression of the ERK inhibitor DUSP1; (4) inhibition of PI3K/AKT expression and down-regulation of C/EBPα and UCA1 gene transcripts; (5) blocking LKB1/AMPK activation; (6) DNA and protein methylation. Different clinical trials have documented curative effects of SAM in alcoholic liver disease. Furthermore, SAM enhances the IFN-α antiviral activity and protects against hepatic ischemia-reperfusion injury during hepatectomy in HCC patients with chronic hepatitis B virus (HBV) infection. However, although SAM prevents experimental tumors, it is not curative against already established experimental and human HCCs. The recent observation that the inhibition of MAT2A and MAT2B expression by miRNAs leads to a rise of endogenous SAM and strong inhibition of cancer cell growth could open new perspectives to the treatment of HCC.
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Affiliation(s)
- Rosa M Pascale
- Department of Clinical, Surgery and Experimental Sciences, Division of Experimental Pathology and Oncology, University of Sassari, 07100 Sassari, Italy.
| | - Graziella Peitta
- Department of Clinical, Surgery and Experimental Sciences, Division of Experimental Pathology and Oncology, University of Sassari, 07100 Sassari, Italy.
| | - Maria M Simile
- Department of Clinical, Surgery and Experimental Sciences, Division of Experimental Pathology and Oncology, University of Sassari, 07100 Sassari, Italy.
| | - Francesco Feo
- Department of Clinical, Surgery and Experimental Sciences, Division of Experimental Pathology and Oncology, University of Sassari, 07100 Sassari, Italy.
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Wang K, Fang S, Liu Q, Gao J, Wang X, Zhu H, Zhu Z, Ji F, Wu J, Ma Y, Hu L, Shen X, Gao D, Zhu J, Liu P, Zhou H. TGF-β1/p65/MAT2A pathway regulates liver fibrogenesis via intracellular SAM. EBioMedicine 2019; 42:458-469. [PMID: 30926424 PMCID: PMC6491716 DOI: 10.1016/j.ebiom.2019.03.058] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2019] [Revised: 03/13/2019] [Accepted: 03/19/2019] [Indexed: 12/15/2022] Open
Abstract
Background Hepatic stellate cell (HSC) activation induced by transforming growth factor β1 (TGF-β1) plays a pivotal role in fibrogenesis, while the complex downstream mediators of TGF-β1 in such process are largely unknown. Methods We performed pharmacoproteomic profiling of the mice liver tissues from control, carbon tetrachloride (CCl4)-induced fibrosis and NPLC0393 administrated groups. The target gene MAT2A was overexpressed or knocked down in vivo by tail vein injection of AAV vectors. We examined NF-κB transcriptional activity on MAT2A promoter via luciferase assay. Intracellular SAM contents were analyzed by LC-MS method. Findings We found that methionine adenosyltransferase 2A (MAT2A) is significantly upregulated in the CCl4-induced fibrosis mice, and application of NPLC0393, a known small molecule inhibitor of TGF-β1 signaling pathway, inhibits the upregulation of MAT2A. Mechanistically, TGF-β1 induces phosphorylation of p65, i.e., activation of NF-κB, thereby promoting mRNA transcription and protein expression of MAT2A and reduces S-adenosylmethionine (SAM) concentration in HSCs. Consistently, in vivo and in vitro knockdown of MAT2A alleviates CCl4- and TGF-β1-induced HSC activation, whereas in vivo overexpression of MAT2A facilitates hepatic fibrosis and abolishes therapeutic effect of NPLC0393. Interpretation This study identifies TGF-β1/p65/MAT2A pathway that is involved in the regulation of intracellular SAM concentration and liver fibrogenesis, suggesting that this pathway is a potential therapeutic target for hepatic fibrosis. Fund This work was supported by National Natural Science Foundation of China (No. 81500469, 81573873, 81774196 and 31800693), Zhejiang Provincial Natural Science Foundation of China (No. Y15H030004), the National Key Research and Development Program from the Ministry of Science and Technology of China (No. 2017YFC1700200) and the Key Program of National Natural Science Foundation of China (No. 8153000502).
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Affiliation(s)
- Kuifeng Wang
- Department of Infectious Diseases, Affiliated Taizhou Hospital of Wenzhou Medical University, 150 Ximen Road of Linhai City, Taizhou 317000, China; Suzhou GenHouse Pharmaceutical Co., Ltd., 388 Ruoshui Road, Suzhou, Jiangsu 215123, China
| | - Shanhua Fang
- Department of Analytical Chemistry, CAS Key Laboratory of Receptor Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Shanghai 201203, China; E-Institute of Shanghai Municipal Education Committee, Shanghai University of Traditional Chinese Medicine, 1200 Cailun Road, Shanghai 201203, China
| | - Qian Liu
- Department of Analytical Chemistry, CAS Key Laboratory of Receptor Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Shanghai 201203, China; University of Chinese Academy of Sciences, No.19A Yuquan Road, Beijing 100049, China
| | - Jing Gao
- Department of Analytical Chemistry, CAS Key Laboratory of Receptor Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Shanghai 201203, China
| | - Xiaoning Wang
- E-Institute of Shanghai Municipal Education Committee, Shanghai University of Traditional Chinese Medicine, 1200 Cailun Road, Shanghai 201203, China; Key Laboratory of Liver and Kidney Diseases (Ministry of Education), Institute of Liver Diseases, Shuguang Hospital, Department of Pharmacology, Shanghai University of Traditional Chinese Medicine, 528 Zhangheng Road, Shanghai 201203, China
| | - Hongwen Zhu
- Department of Analytical Chemistry, CAS Key Laboratory of Receptor Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Shanghai 201203, China
| | - Zhenyun Zhu
- Department of Analytical Chemistry, CAS Key Laboratory of Receptor Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Shanghai 201203, China
| | - Feihong Ji
- Department of Infectious Diseases, Affiliated Taizhou Hospital of Wenzhou Medical University, 150 Ximen Road of Linhai City, Taizhou 317000, China; Suzhou GenHouse Pharmaceutical Co., Ltd., 388 Ruoshui Road, Suzhou, Jiangsu 215123, China
| | - Jiasheng Wu
- Key Laboratory of Liver and Kidney Diseases (Ministry of Education), Institute of Liver Diseases, Shuguang Hospital, Department of Pharmacology, Shanghai University of Traditional Chinese Medicine, 528 Zhangheng Road, Shanghai 201203, China
| | - Yueming Ma
- Key Laboratory of Liver and Kidney Diseases (Ministry of Education), Institute of Liver Diseases, Shuguang Hospital, Department of Pharmacology, Shanghai University of Traditional Chinese Medicine, 528 Zhangheng Road, Shanghai 201203, China
| | - Lihong Hu
- Department of Analytical Chemistry, CAS Key Laboratory of Receptor Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Shanghai 201203, China; University of Chinese Academy of Sciences, No.19A Yuquan Road, Beijing 100049, China; State Key Laboratory Cultivation Base for TCM Quality and Efficacy, School of Medicine and Life Sciences, Nanjing University of Chinese Medicine, 138 Xianlin Road, Nanjing 210023, China
| | - Xu Shen
- Department of Analytical Chemistry, CAS Key Laboratory of Receptor Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Shanghai 201203, China; University of Chinese Academy of Sciences, No.19A Yuquan Road, Beijing 100049, China; State Key Laboratory Cultivation Base for TCM Quality and Efficacy, School of Medicine and Life Sciences, Nanjing University of Chinese Medicine, 138 Xianlin Road, Nanjing 210023, China
| | - Daming Gao
- CAS Key Laboratory of Systems Biology, CAS Center for Excellence in Molecular Cell Science, Innovation Center for Cell Signaling Network, Shanghai Institute of Biochemistry and Cell Biology, Chinese Academy of Sciences, 320 Yueyang Road, Shanghai 200031, China
| | - Jiansheng Zhu
- Department of Infectious Diseases, Affiliated Taizhou Hospital of Wenzhou Medical University, 150 Ximen Road of Linhai City, Taizhou 317000, China.
| | - Ping Liu
- E-Institute of Shanghai Municipal Education Committee, Shanghai University of Traditional Chinese Medicine, 1200 Cailun Road, Shanghai 201203, China; Key Laboratory of Liver and Kidney Diseases (Ministry of Education), Institute of Liver Diseases, Shuguang Hospital, Department of Pharmacology, Shanghai University of Traditional Chinese Medicine, 528 Zhangheng Road, Shanghai 201203, China.
| | - Hu Zhou
- Department of Analytical Chemistry, CAS Key Laboratory of Receptor Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Shanghai 201203, China; E-Institute of Shanghai Municipal Education Committee, Shanghai University of Traditional Chinese Medicine, 1200 Cailun Road, Shanghai 201203, China; University of Chinese Academy of Sciences, No.19A Yuquan Road, Beijing 100049, China.
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13
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Li Y, Wang Y, Wu P. 5'-Methylthioadenosine and Cancer: old molecules, new understanding. J Cancer 2019; 10:927-936. [PMID: 30854099 PMCID: PMC6400808 DOI: 10.7150/jca.27160] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2018] [Accepted: 12/17/2018] [Indexed: 12/19/2022] Open
Abstract
While the metabolic changes in cancer tissues were first observed by Warburg Otto almost a century ago, altered metabolism has recently returned as a focus of cancer research. 5'-Methylthioadenosine (MTA) is a naturally occurring sulfur-containing nucleoside found in numerous species. While MTA was first isolated several decades ago, a lack of sensitive and specific analytical methodologies designed for its direct quantification has hampered the study of its physiological and pathophysiological features. Many studies indicate that MTA suppresses tumors by inhibiting tumor cell proliferation, invasion, and the induction of apoptosis while controlling the inflammatory micro-environments of tumor tissue. In this review, we assessed the effects of MTA and of related materials on the growth and functions of normal and malignant cells.
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Affiliation(s)
- Yaofeng Li
- Department of Pathophysiology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Yubo Wang
- College of Pharmacy, Hubei University of Chinese Medicine, Wuhan 430065, China
| | - Ping Wu
- Department of Pathophysiology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
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14
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Yang R, Zhao Q, Hu DD, Xiao XR, Huang JF, Li F. Metabolomic analysis of cholestatic liver damage in mice. Food Chem Toxicol 2018; 120:253-260. [DOI: 10.1016/j.fct.2018.07.022] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2018] [Revised: 06/27/2018] [Accepted: 07/11/2018] [Indexed: 02/08/2023]
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15
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Simile MM, Latte G, Feo CF, Feo F, Calvisi DF, Pascale RM. Alterations of methionine metabolism in hepatocarcinogenesis: the emergent role of glycine N-methyltransferase in liver injury. Ann Gastroenterol 2018; 31:552-560. [PMID: 30174391 PMCID: PMC6102450 DOI: 10.20524/aog.2018.0288] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/12/2018] [Accepted: 05/02/2018] [Indexed: 12/30/2022] Open
Abstract
The methionine and folate cycles play a fundamental role in cell physiology and their alteration is involved in liver injury and hepatocarcinogenesis. Glycine N-methyltransferase is implicated in methyl group supply, DNA methylation, and nucleotide biosynthesis. It regulates the cellular S-adenosylmethionine/S-adenosylhomocysteine ratio and S-adenosylmethionine-dependent methyl transfer reactions. Glycine N-methyltransferase is absent in fast-growing hepatocellular carcinomas and present at a low level in slower growing HCC ones. The mechanism of tumor suppression by glycine N-methyltransferase is not completely known. Glycine N-methyltransferase inhibits hepatocellular carcinoma growth through interaction with Dep domain-containing mechanistic target of rapamycin (mTor)-interacting protein, a binding protein overexpressed in hepatocellular carcinoma. The interaction of the phosphatase and tensin homolog inhibitor, phosphatidylinositol 3,4,5-trisphosphate-dependent rac exchanger, with glycine N-methyltransferase enhances proteasomal degradation of this exchanger by the E3 ubiquitin ligase HectH. Glycine N-methyltransferase also regulates genes related to detoxification and antioxidation pathways. It supports pyrimidine and purine syntheses and minimizes uracil incorporation into DNA as consequence of folate depletion. However, recent evidence indicates that glycine N-methyltransferase targeted into nucleus still exerts strong anti-proliferative effects independent of its catalytic activity, while its restriction to cytoplasm prevents these effects. Our current knowledge suggest that glycine N-methyltransferase plays a fundamental, even if not yet completely known, role in cellular physiology and highlights the need to further investigate this role in normal and cancer cells.
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Affiliation(s)
- Maria M Simile
- Department of Clinical, Surgical and Experimental Medicine, Division of Experimental Pathology and Oncology (Maria M. Simile, Gavinella Latte, Francesco Feo, Diego F. Calvisi, Rosa M. Pascale), University of Sassari, Sassari, Italy
| | - Gavinella Latte
- Department of Clinical, Surgical and Experimental Medicine, Division of Experimental Pathology and Oncology (Maria M. Simile, Gavinella Latte, Francesco Feo, Diego F. Calvisi, Rosa M. Pascale), University of Sassari, Sassari, Italy
| | - Claudio F Feo
- Department of Clinical, Surgical and Experimental Medicine, Division of Surgery (Claudio F. Feo), University of Sassari, Sassari, Italy
| | - Francesco Feo
- Department of Clinical, Surgical and Experimental Medicine, Division of Experimental Pathology and Oncology (Maria M. Simile, Gavinella Latte, Francesco Feo, Diego F. Calvisi, Rosa M. Pascale), University of Sassari, Sassari, Italy
| | - Diego F Calvisi
- Department of Clinical, Surgical and Experimental Medicine, Division of Experimental Pathology and Oncology (Maria M. Simile, Gavinella Latte, Francesco Feo, Diego F. Calvisi, Rosa M. Pascale), University of Sassari, Sassari, Italy
| | - Rosa M Pascale
- Department of Clinical, Surgical and Experimental Medicine, Division of Experimental Pathology and Oncology (Maria M. Simile, Gavinella Latte, Francesco Feo, Diego F. Calvisi, Rosa M. Pascale), University of Sassari, Sassari, Italy
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16
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Sadek KM, Lebda MA, Nasr NE, Nasr SM, El-Sayed Y. Role of lncRNAs as prognostic markers of hepatic cancer and potential therapeutic targeting by S-adenosylmethionine via inhibiting PI3K/Akt signaling pathways. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:20057-20070. [PMID: 29748795 DOI: 10.1007/s11356-018-2179-8] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2017] [Accepted: 04/30/2018] [Indexed: 06/08/2023]
Abstract
Hepatic cancer (HCC) is a well-identified dilemma throughout the world, and hence, the molecular mechanisms and strategy for preventive protection against this malignancy are critical. S-adenosylmethionine (SAM) is a unique methyl granter in vast reactions, including DNA methylation, and secures the genome against hypomethylation, which is a hallmark of tumors. Consequently, SAM may control the rate of gene expression. The objective of this investigation was to evaluate the expression of long noncoding RNAs (lncRNAs) transcript involved in hepatic tumorigenesis, including additional coding CEBPA (ecCEBPA) and urothelial carcinoma related 1 (UCA1), antioxidant enzymes transcripts, and relevant signaling pathway in diethylnitrosamine (DEN)-prompted HCC along with their conceivable targeting by SAM at different stages of HCC in rats. Our outcomes revealed that SAM particularly when given at the starting phase downregulates ecCEBPA and UCA1 gene transcripts and ameliorate histopathological alterations in DEN-initiated HCC. Interestingly, SAM attenuates DEN-induced upregulation of PI3K/Akt protein expression. However, SAM upregulates the antioxidant enzymes mRNA transcripts and effectively diminishing DNA oxidation. The results of a DNA fragmentation assay further support the capacity of SAM to ameliorate DEN-induced hepatic malignancy. These results revealed the role of ecCEBPA and UCA1 in HCC and suggest that these lncRNAs may be helpful as prognostic and analytical biomarkers of HCC. Curiously, SAM readily targets the studied genes via inhibiting PI3K/Akt signaling pathway, which should make SAM an appealing agent for both chemoprevention and treatment of HCC.
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Affiliation(s)
- Kadry M Sadek
- Department of Biochemistry, Faculty of Veterinary Medicine, Damanhour University, Damanhour, Egypt.
| | - Mohamed A Lebda
- Department of Biochemistry, Faculty of Veterinary Medicine, Alexandria University, Alexandria, Egypt
| | - Nasr E Nasr
- Department of Biochemistry, Faculty of Veterinary Medicine, Kafr El-Sheikh University, Kafr El-Sheikh, Egypt
| | - Sherif M Nasr
- Department of Molecular Biology and Genetics, Faculty of Veterinary Medicine, Damanhour University, Damanhour, Egypt
| | - Yasser El-Sayed
- Department of Forensic Medicine and Toxicology, Faculty of Veterinary Medicine, Damanhour University, Damanhour, Egypt
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Pascale RM, Feo CF, Calvisi DF, Feo F. Deregulation of methionine metabolism as determinant of progression and prognosis of hepatocellular carcinoma. Transl Gastroenterol Hepatol 2018; 3:36. [PMID: 30050996 DOI: 10.21037/tgh.2018.06.04] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/15/2018] [Accepted: 06/15/2018] [Indexed: 12/11/2022] Open
Abstract
The under-regulation of liver-specific MAT1A gene codifying for S-adenosylmethionine (SAM) synthesizing isozymes MATI/III, and the up-regulation of widely expressed MAT2A, MATII isozyme occurs in hepatocellular carcinoma (HCC). MATα1:MATα2 switch strongly contributes to the fall in SAM liver content both in rodent and human liver carcinogenesis. SAM administration to carcinogen-treated animals inhibits hepatocarcinogenesis. The opposite occurs in Mat1a-KO mice, in which chronic SAM deficiency is followed by HCC development. This review focuses upon the changes, induced by the MATα1:MATα2 switch, involved in HCC development. In association with MATα1:MATα2 switch there occurs, in HCC, global DNA hypomethylation, decline of DNA repair, genomic instability, and deregulation of different signaling pathways such as overexpression of c-MYC (avian myelocytomatosis viral oncogene homolog), increase of polyamine (PA) synthesis and RAS/ERK (Harvey murine sarcoma virus oncogene homolog/extracellular signal-regulated kinase), IKK/NF-kB (I-k kinase beta/nuclear factor kB), PI3K/AKT, and LKB1/AMPK axes. Furthermore, a decrease in MATα1 expression and SAM level induces HCC cell proliferation and survival. SAM treatment in vivo and enforced MATα1 overexpression or MATα2 inhibition, in cultured HCC cells, prevent these changes. A negative correlation of MATα1:MATα2 and MATI/III:MATII ratios with cell proliferation and genomic instability and a positive correlation with apoptosis and global DNA methylation are present in human HCC. Altogether, these data suggest that the decrease of SAM level and the deregulation of MATs are potential therapeutic targets for HCC.
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Affiliation(s)
- Rosa M Pascale
- Department of Medical, Surgery, and Experimental Medicine, Division of Experimental Pathology and Oncology, University of Sassari, Sassari, Italy
| | - Claudio F Feo
- Department of Medical, Surgery, and Experimental Medicine, Division of Surgery, University of Sassari, Sassari, Italy
| | - Diego F Calvisi
- Department of Medical, Surgery, and Experimental Medicine, Division of Experimental Pathology and Oncology, University of Sassari, Sassari, Italy
| | - Francesco Feo
- Department of Medical, Surgery, and Experimental Medicine, Division of Experimental Pathology and Oncology, University of Sassari, Sassari, Italy
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18
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Methylthioadenosine promotes remyelination by inducing oligodendrocyte differentiation. ACTA ACUST UNITED AC 2017. [DOI: 10.1186/s40893-017-0020-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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19
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Walker DI, Uppal K, Zhang L, Vermeulen R, Smith M, Hu W, Purdue MP, Tang X, Reiss B, Kim S, Li L, Huang H, Pennell KD, Jones DP, Rothman N, Lan Q. High-resolution metabolomics of occupational exposure to trichloroethylene. Int J Epidemiol 2016; 45:1517-1527. [PMID: 27707868 PMCID: PMC5100622 DOI: 10.1093/ije/dyw218] [Citation(s) in RCA: 75] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/12/2016] [Indexed: 12/28/2022] Open
Abstract
Background: Occupational exposure to trichloroethylene (TCE) has been linked to adverse health outcomes including non-Hodgkin’s lymphoma and kidney and liver cancer; however, TCE’s mode of action for development of these diseases in humans is not well understood. Methods: Non-targeted metabolomics analysis of plasma obtained from 80 TCE-exposed workers [full shift exposure range of 0.4 to 230 parts-per-million of air (ppma)] and 95 matched controls were completed by ultra-high resolution mass spectrometry. Biological response to TCE exposure was determined using a metabolome-wide association study (MWAS) framework, with metabolic changes and plasma TCE metabolites evaluated by dose-response and pathway enrichment. Biological perturbations were then linked to immunological, renal and exposure molecular markers measured in the same population. Results: Metabolic features associated with TCE exposure included known TCE metabolites, unidentifiable chlorinated compounds and endogenous metabolites. Exposure resulted in a systemic response in endogenous metabolism, including disruption in purine catabolism and decreases in sulphur amino acid and bile acid biosynthesis pathways. Metabolite associations with TCE exposure included uric acid (β = 0.13, P-value = 3.6 × 10−5), glutamine (β = 0.08, P-value = 0.0013), cystine (β = 0.75, P-value = 0.0022), methylthioadenosine (β = −1.6, P-value = 0.0043), taurine (β = −2.4, P-value = 0.0011) and chenodeoxycholic acid (β = −1.3, P-value = 0.0039), which are consistent with known toxic effects of TCE, including immunosuppression, hepatotoxicity and nephrotoxicity. Correlation with additional exposure markers and physiological endpoints supported known disease associations. Conclusions: High-resolution metabolomics correlates measured occupational exposure to internal dose and metabolic response, providing insight into molecular mechanisms of exposure-related disease aetiology.
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Affiliation(s)
- Douglas I Walker
- Pulmonary, Allergy and Critical Medicine, Emory University, Atlanta, GA, USA, .,Deptartment of Civil and Environmental Engineering, Tufts University, Medford, MA, USA
| | - Karan Uppal
- Pulmonary, Allergy and Critical Medicine, Emory University, Atlanta, GA, USA
| | - Luoping Zhang
- Environmental Health Sciences, University of California at Berkeley, Berkeley, CA, USA
| | - Roel Vermeulen
- Institute for Risk Assessment Sciences, University of Utrecht, Utrecht, The Netherlands
| | - Martyn Smith
- Environmental Health Sciences, University of California at Berkeley, Berkeley, CA, USA
| | - Wei Hu
- Cancer Epidemiology and Genetics, National Cancer Institute, Bethesda, MD, USA
| | - Mark P Purdue
- Cancer Epidemiology and Genetics, National Cancer Institute, Bethesda, MD, USA
| | - Xiaojiang Tang
- Guangdong Medical Laboratory Animal Center, Guangdong, China
| | - Boris Reiss
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA, USA and
| | - Sungkyoon Kim
- School of Public Health, Seoul National University, Seoul, Republic of Korea
| | - Laiyu Li
- Guangdong Medical Laboratory Animal Center, Guangdong, China
| | - Hanlin Huang
- Guangdong Medical Laboratory Animal Center, Guangdong, China
| | - Kurt D Pennell
- Deptartment of Civil and Environmental Engineering, Tufts University, Medford, MA, USA.,Pulmonary, Allergy and Critical Medicine, Emory University, Atlanta, GA, USA
| | - Dean P Jones
- Pulmonary, Allergy and Critical Medicine, Emory University, Atlanta, GA, USA
| | - Nathaniel Rothman
- Cancer Epidemiology and Genetics, National Cancer Institute, Bethesda, MD, USA
| | - Qing Lan
- Cancer Epidemiology and Genetics, National Cancer Institute, Bethesda, MD, USA
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Modulation of gamma-irradiation and carbon tetrachloride induced oxidative stress in the brain of female rats by flaxseed oil. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2016; 161:91-9. [DOI: 10.1016/j.jphotobiol.2016.04.031] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2015] [Revised: 04/13/2016] [Accepted: 04/18/2016] [Indexed: 01/24/2023]
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21
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Henrich FC, Singer K, Poller K, Bernhardt L, Strobl CD, Limm K, Ritter AP, Gottfried E, Völkl S, Jacobs B, Peter K, Mougiakakos D, Dettmer K, Oefner PJ, Bosserhoff AK, Kreutz MP, Aigner M, Mackensen A. Suppressive effects of tumor cell-derived 5'-deoxy-5'-methylthioadenosine on human T cells. Oncoimmunology 2016; 5:e1184802. [PMID: 27622058 DOI: 10.1080/2162402x.2016.1184802] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2016] [Revised: 04/13/2016] [Accepted: 04/26/2016] [Indexed: 02/01/2023] Open
Abstract
The immunosuppressive tumor microenvironment represents one of the main obstacles for immunotherapy of cancer. The tumor milieu is among others shaped by tumor metabolites such as 5'-deoxy-5'-methylthioadenosine (MTA). Increased intratumoral MTA levels result from a lack of the MTA-catabolizing enzyme methylthioadenosine phosphorylase (MTAP) in tumor cells and are found in various tumor entities. Here, we demonstrate that MTA suppresses proliferation, activation, differentiation, and effector function of antigen-specific T cells without eliciting cell death. Conversely, if MTA is added to highly activated T cells, MTA exerts cytotoxic effects on T cells. We identified the Akt pathway, a critical signal pathway for T cell activation, as a target of MTA, while, for example, p38 remained unaffected. Next, we provide evidence that MTA exerts its immunosuppressive effects by interfering with protein methylation in T cells. To confirm the relevance of the suppressive effects of exogenously added MTA on human T cells, we used an MTAP-deficient tumor cell-line that was stably transfected with the MTAP-coding sequence. We observed that T cells stimulated with MTAP-transfected tumor cells revealed a higher proliferative capacity compared to T cells stimulated with Mock-transfected cells. In conclusion, our findings reveal a novel immune evasion strategy of human tumor cells that could be of interest for therapeutic targeting.
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Affiliation(s)
- Frederik C Henrich
- Department of Internal Medicine 5 - Hematology and Oncology, University Hospital of Erlangen , Erlangen, Germany
| | - Katrin Singer
- Department of Internal Medicine 5 - Hematology and Oncology, University Hospital of Erlangen, Erlangen, Germany; Department of Internal Medicine 3 - Hematology and Oncology, University Hospital of Regensburg, Regensburg, Germany
| | - Kerstin Poller
- Department of Internal Medicine 5 - Hematology and Oncology, University Hospital of Erlangen , Erlangen, Germany
| | - Luise Bernhardt
- Department of Internal Medicine 5 - Hematology and Oncology, University Hospital of Erlangen , Erlangen, Germany
| | - Carolin D Strobl
- Department of Internal Medicine 5 - Hematology and Oncology, University Hospital of Erlangen , Erlangen, Germany
| | - Katharina Limm
- Institute of Biochemistry - Emil-Fischer-Zentrum, Friedrich-Alexander University of Erlangen-Nuremberg , Erlangen, Germany
| | - Axel P Ritter
- Institute of Functional Genomics, University of Regensburg , Regensburg, Germany
| | - Eva Gottfried
- Department of Internal Medicine 3 - Hematology and Oncology, University Hospital of Regensburg , Regensburg, Germany
| | - Simon Völkl
- Department of Internal Medicine 5 - Hematology and Oncology, University Hospital of Erlangen , Erlangen, Germany
| | - Benedikt Jacobs
- Department of Internal Medicine 5 - Hematology and Oncology, University Hospital of Erlangen, Erlangen, Germany; Department of Cancer Immunology, Institute for Cancer Research, Oslo University Hospital, Radiumhospital, Oslo, Norway; The KG Jebsen Center for Cancer Immunotherapy, Institute of Clinical Medicine, University of Oslo, Oslo, Norway
| | - Katrin Peter
- Department of Internal Medicine 3 - Hematology and Oncology, University Hospital of Regensburg , Regensburg, Germany
| | - Dimitrios Mougiakakos
- Department of Internal Medicine 5 - Hematology and Oncology, University Hospital of Erlangen , Erlangen, Germany
| | - Katja Dettmer
- Institute of Functional Genomics, University of Regensburg , Regensburg, Germany
| | - Peter J Oefner
- Institute of Functional Genomics, University of Regensburg , Regensburg, Germany
| | - Anja-Katrin Bosserhoff
- Institute of Biochemistry - Emil-Fischer-Zentrum, Friedrich-Alexander University of Erlangen-Nuremberg , Erlangen, Germany
| | - Marina P Kreutz
- Department of Internal Medicine 3 - Hematology and Oncology, University Hospital of Regensburg , Regensburg, Germany
| | - Michael Aigner
- Department of Internal Medicine 5 - Hematology and Oncology, University Hospital of Erlangen , Erlangen, Germany
| | - Andreas Mackensen
- Department of Internal Medicine 5 - Hematology and Oncology, University Hospital of Erlangen , Erlangen, Germany
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Antifibrotic effect of meloxicam in rat liver: role of nuclear factor kappa B, proinflammatory cytokines, and oxidative stress. Naunyn Schmiedebergs Arch Pharmacol 2016; 389:971-83. [PMID: 27245167 DOI: 10.1007/s00210-016-1263-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2016] [Accepted: 05/24/2016] [Indexed: 01/01/2023]
Abstract
This study was aimed at investigating the antifibrotic effect of meloxicam in CCl4-induced liver fibrosis and elucidating its underlying mechanism. Forty male rats were equally randomized for 8-week treatment with corn oil (negative control), CCl4 (to induce liver fibrosis), and/or meloxicam. Meloxicam effectively ameliorated the CCl4-induced alterations in liver histology, liver weight to body weight ratio, liver functions, and serum markers for liver fibrosis (hyaluronic acid, laminin, and PCIII). Meloxicam significantly abrogated CCl4-induced elevation of messenger RNA (mRNA) expressions for collagen I and alpha smooth muscle actin (α-SMA) and hepatic contents of hydroxyproline, transforming growth factor beta (TGF-β), and tissue inhibitor of matrix metalloproteases (TIMP-1). Meloxicam mitigated CCl4-induced elevation in hepatic levels of nuclear factor kappa B (NF-κB), tumor necrosis factor alpha (TNF-α), total nitric oxide (NO), interleukin-l beta (IL 1β), and prostaglandin E2 (PGE2). Meloxicam modulated CCl4-induced disturbance of liver cytochrome P450 subfamily 2E1 (CYP2E1) and glutathione-S-transferase (GST). The attenuation of meloxicam to liver fibrosis was associated with suppression of oxidative stress via reduction of lipid peroxides along with induction of reduced glutathione content and enhancement of superoxide dismutase, glutathione peroxidase, and catalase activities. This study provides an evidence for antifibrotic effect of meloxicam against CCl4-induced liver fibrosis in rat. The antifibrotic mechanism of meloxicam could be through decreasing NF-κB level and subsequent proinflammatory cytokine production (TNF-α, NO, IL-1 beta, and PGE2) and, hence, collagen deposition through inhibition of TIMP-1 and TGF-β. Abrogation of oxidative stress and modulation of liver-metabolizing enzymes (CYP2E1 and GST) were also involved.
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Niranjana Murthy H, Dandin VS, Yoeup Paek K. Hepatoprotective activity of ginsenosides from Panax ginseng adventitious roots against carbon tetrachloride treated hepatic injury in rats. JOURNAL OF ETHNOPHARMACOLOGY 2014; 158 Pt A:442-6. [PMID: 25446594 DOI: 10.1016/j.jep.2014.10.047] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2014] [Revised: 09/21/2014] [Accepted: 10/17/2014] [Indexed: 05/10/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Ginseng (Panax ginseng C. A. Meyer) has a beneficial role in the treatment of various diseases including liver disorders like acute/chronic hepatotoxicity, hepatitis, hepatic fibrosis/cirrhosis and hepatocellular carcinoma. MATERIALS AND METHODS Tissue culture raised mountain ginseng adventitious root (TCMGARs) extract with ginsenosides in abundance was used as an experimental material. 'Sprague-Dawley' male rats were used as experimental systems and were fed with TCMGARs extracts at doses of 30, 100, 300mg/kg body weight for two weeks to test the effect on carbon tetrachloride (CCl4) induced acute liver damage. Field cultivated Korean ginseng root extract fed rats (100mg/kg) were used as positive control. Plasma enzyme levels, alanine aminotransferase (ALT), aspartate aminotransferase (AST) and alkaline phosphatase (ALP) were assessed. Glutathione (GSH) and malondialdehyde (MDA) concentrations were also evaluated. RESULTS TCMGARs extracts remarkably prevented the elevation of ALT, AST, ALP and liver peroxides in CCl4-treated rats. Hepatic glutathione levels were significantly increased by the treatment with the extracts in experimental groups. CONCLUSION The TCMGARs rich in varied ginsenosides can afford protection against CCl4-induced hepatocellular injury.
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Affiliation(s)
- Hosakatte Niranjana Murthy
- Research Center for the Development of Advanced Horticultural Technology, Chungbuk National University, Cheongju 361-763, Republic of Korea; Department of Botany, Karnatak University, Dharwad 580003, India.
| | | | - Kee Yoeup Paek
- Research Center for the Development of Advanced Horticultural Technology, Chungbuk National University, Cheongju 361-763, Republic of Korea.
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Hepatoprotective effect of the aqueous extract of Simarouba amara Aublet (Simaroubaceae) stem bark against carbon tetrachloride (CCl4)-induced hepatic damage in rats. Molecules 2014; 19:17735-46. [PMID: 25365298 PMCID: PMC6270786 DOI: 10.3390/molecules191117735] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2014] [Revised: 10/10/2014] [Accepted: 10/21/2014] [Indexed: 01/15/2023] Open
Abstract
Simarouba amara stem bark decoction has been traditionally used in Brazil to treat malaria, inflammation, fever, abdominal pain, diarrhea, wounds and as a tonic. In this study, we investigate the hepatoprotective effects of the aqueous extract of S. amara stem bark (SAAE) on CCl4-induced hepatic damage in rats. SAAE was evaluated by high performance liquid chromatography. The animals were divided into six groups (n = 6/group). Groups I (vehicle—corn oil), II (control-CCl4), III, IV, V and VI were pretreated during 10 consecutive days, once a day p.o, with Legalon® 50 mg/kg b.w, SAAE at doses 100, 250 and 500 mg/kg b.w, respectively. The hepatotoxicity was induced on 11th day with 2 mL/kg of 20% CCl4 solution. 24 h after injury, the blood samples were collected and their livers were removed to biochemical and immunohistochemical analyzes. The SAAE decreased the levels of liver markers and lipid peroxidation in all doses and increased the catalase levels at doses 250 and 500 mg/kg. Immunohistochemical results suggested hepatocyte proliferation in all doses. These results may be related to catechins present in SAAE. Thus, SAAE prevented the oxidative damage at the same time that increased regenerative and reparative capacities of the liver.
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Wong HS, Chen JH, Leong PK, Leung HY, Chan WM, Ko KM. β-sitosterol protects against carbon tetrachloride hepatotoxicity but not gentamicin nephrotoxicity in rats via the induction of mitochondrial glutathione redox cycling. Molecules 2014; 19:17649-62. [PMID: 25361427 PMCID: PMC6271253 DOI: 10.3390/molecules191117649] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2014] [Revised: 10/23/2014] [Accepted: 10/24/2014] [Indexed: 01/04/2023] Open
Abstract
Previous findings have demonstrated that β-sitosterol (BSS), an active component of Cistanches Herba, protected against oxidant injury in H9c2 cardiomyocytes and in rat hearts by enhancing mitochondrial glutathione redox cycling, possibly through the intermediacy of mitochondrial reactive oxygen species production. We therefore hypothesized that BSS pretreatment can also confer tissue protection against oxidant injury in other vital organs such as liver and kidney of rats. In this study, the effects of BSS pretreatment on rat models of carbon tetrachloride (CCl4) hepatotoxicity and gentamicin nephrotoxicity were investigated. The findings showed that BSS pretreatment protected against CCl4-induced hepatotoxicity, but not gentamicin nephrotoxicity in rats. The hepatoprotection afforded by BSS was associated with the improvement in mitochondrial glutathione redox status, presumably through the glutathione reductase-mediated enhancement in mitochondrial glutathione redox cycling. The hepatoprotection afforded by BSS was also accompanied by the improved mitochondrial functional ability in rat livers. The inability of BSS to protect against gentamicin nephrotoxicity was likely due to the relatively low bioavailability of BSS in rat kidneys. BSS may serve as potential mitohormetic agent for the prevention of oxidative stress-induced injury in livers.
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Affiliation(s)
- Hoi-Shan Wong
- Division of Life Science, Hong Kong University of Science and Technology, Hong Kong, China.
| | - Ji-Hang Chen
- Division of Life Science, Hong Kong University of Science and Technology, Hong Kong, China.
| | - Pou-Kuan Leong
- Division of Life Science, Hong Kong University of Science and Technology, Hong Kong, China.
| | - Hoi-Yan Leung
- Division of Life Science, Hong Kong University of Science and Technology, Hong Kong, China.
| | - Wing-Man Chan
- Division of Life Science, Hong Kong University of Science and Technology, Hong Kong, China.
| | - Kam-Ming Ko
- Division of Life Science, Hong Kong University of Science and Technology, Hong Kong, China.
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Wohlenberg M, Almeida D, Bokowski L, Medeiros N, Agostini F, Funchal C, Dani C. Antioxidant Activity of Grapevine Leaf Extracts against Oxidative Stress Induced by Carbon Tetrachloride in Cerebral Cortex, Hippocampus and Cerebellum of Rats. Antioxidants (Basel) 2014; 3:200-11. [PMID: 26784867 PMCID: PMC4665481 DOI: 10.3390/antiox3020200] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2013] [Revised: 03/10/2014] [Accepted: 03/17/2014] [Indexed: 01/07/2023] Open
Abstract
In recent years, it has become increasingly important to study the beneficial properties of derivatives of grapes and grapevine. The objective of this study was to determine the antioxidant activity of Vitis labrusca leaf extracts, comparing conventional and organic grapevines, in different brain areas of rats. We used male Wistar rats treated with grapevine leaf extracts for a period of 14 days, and on the 15th day, we administered in half of the rats, mineral oil and the other half, carbon tetrachloride (CCl₄). The animals were euthanized by decapitation and the cerebral cortex, hippocampus and cerebellum were removed to assess oxidative stress parameters and the activity of antioxidant enzymes. Lipid peroxidation levels (TBARS) were unchanged. However, CCl₄ induced oxidative damage to proteins in all tissues studied, and this injury was prevented by both extracts. Superoxide dismutase (SOD) activity was increased by CCl₄ in the cerebral cortex and decreased in other tissues. However, CCl₄ increased catalase (CAT) activity in the cerebellum and decreased it in the cerebral cortex. The SOD/CAT ratio was restored in the cerebellum by both extracts and only in the cerebral cortex by the organic extract.
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Affiliation(s)
- Mariane Wohlenberg
- Centro Universitário Metodista IPA, Coronel Joaquim Pedro Salgado 80, Porto Alegre 90420-060, Brazil.
| | - Daniela Almeida
- Centro Universitário Metodista IPA, Coronel Joaquim Pedro Salgado 80, Porto Alegre 90420-060, Brazil.
| | - Liane Bokowski
- Centro Universitário Metodista IPA, Coronel Joaquim Pedro Salgado 80, Porto Alegre 90420-060, Brazil.
| | - Niara Medeiros
- Centro Universitário Metodista IPA, Coronel Joaquim Pedro Salgado 80, Porto Alegre 90420-060, Brazil.
| | - Fabiana Agostini
- Universidade de Caxias do Sul, Francisco Getúlio Vargas 1130, Caxias do Sul 95070-560, Brazil.
| | - Cláudia Funchal
- Centro Universitário Metodista IPA, Coronel Joaquim Pedro Salgado 80, Porto Alegre 90420-060, Brazil.
| | - Caroline Dani
- Centro Universitário Metodista IPA, Coronel Joaquim Pedro Salgado 80, Porto Alegre 90420-060, Brazil.
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Moreno B, Lopez I, Fernández-Díez B, Gottlieb M, Matute C, Sánchez-Gómez MV, Domercq M, Giralt A, Alberch J, Collon KW, Zhang H, Parent JM, Teixido M, Giralt E, Ceña V, Posadas I, Martínez-Pinilla E, Villoslada P, Franco R. Differential neuroprotective effects of 5'-deoxy-5'-methylthioadenosine. PLoS One 2014; 9:e90671. [PMID: 24599318 PMCID: PMC3944389 DOI: 10.1371/journal.pone.0090671] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2013] [Accepted: 02/04/2014] [Indexed: 11/19/2022] Open
Abstract
Background 5′-deoxy-5′-methylthioadenosine (MTA) is an endogenous compound produced through the metabolism of polyamines. The therapeutic potential of MTA has been assayed mainly in liver diseases and, more recently, in animal models of multiple sclerosis. The aim of this study was to determine the neuroprotective effect of this molecule in vitro and to assess whether MTA can cross the blood brain barrier (BBB) in order to also analyze its potential neuroprotective efficacy in vivo. Methods Neuroprotection was assessed in vitro using models of excitotoxicity in primary neurons, mixed astrocyte-neuron and primary oligodendrocyte cultures. The capacity of MTA to cross the BBB was measured in an artificial membrane assay and using an in vitro cell model. Finally, in vivo tests were performed in models of hypoxic brain damage, Parkinson's disease and epilepsy. Results MTA displays a wide array of neuroprotective activities against different insults in vitro. While the data from the two complementary approaches adopted indicate that MTA is likely to cross the BBB, the in vivo data showed that MTA may provide therapeutic benefits in specific circumstances. Whereas MTA reduced the neuronal cell death in pilocarpine-induced status epilepticus and the size of the lesion in global but not focal ischemic brain damage, it was ineffective in preserving dopaminergic neurons of the substantia nigra in the 1-methyl-4-phenyl-1,2,3,6-tetrahydro-pyridine (MPTP)-mice model. However, in this model of Parkinson's disease the combined administration of MTA and an A2A adenosine receptor antagonist did produce significant neuroprotection in this brain region. Conclusion MTA may potentially offer therapeutic neuroprotection.
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Affiliation(s)
- Beatriz Moreno
- Center of Neuroimmunology, Institut d'investigacions Biomèdiques August Pi I Sunyer (IDIBAPS) - Hospital Clinic of Barcelona, Barcelona, Spain
- * E-mail:
| | - Iciar Lopez
- CIMA, Neurosciences Division, University of Navarra, Pamplona, Spain
- Oncology Area, Lung Cancer Unit, Center for Biomedical Research of la Rioja (CIBIR), Logroño, Spain
| | - Begoña Fernández-Díez
- Center of Neuroimmunology, Institut d'investigacions Biomèdiques August Pi I Sunyer (IDIBAPS) - Hospital Clinic of Barcelona, Barcelona, Spain
| | - Miroslav Gottlieb
- Department of Neurosciences, University of Basque Country, Achucarro Basque Center for Neuroscience, Leioa, Spain
- Institute of Neurobiology, Slovak Academy of Sciences, Kosice, Slovak Republic
| | - Carlos Matute
- Department of Neurosciences, University of Basque Country, Achucarro Basque Center for Neuroscience, Leioa, Spain
- Institute of Neurobiology, Slovak Academy of Sciences, Kosice, Slovak Republic
- Centro de Investigaciones Biomédicas en red en Enfermedades Neurodegenerativas (CIBERNED), Madrid, Spain
| | - María Victoria Sánchez-Gómez
- Department of Neurosciences, University of Basque Country, Achucarro Basque Center for Neuroscience, Leioa, Spain
| | - María Domercq
- Department of Neurosciences, University of Basque Country, Achucarro Basque Center for Neuroscience, Leioa, Spain
| | - Albert Giralt
- Centro de Investigaciones Biomédicas en red en Enfermedades Neurodegenerativas (CIBERNED), Madrid, Spain
- Department of Cellular Biology, Immunology and Neurosciences, Medicine School, University of Barcelona, Barcelona, Spain
| | - Jordi Alberch
- Centro de Investigaciones Biomédicas en red en Enfermedades Neurodegenerativas (CIBERNED), Madrid, Spain
- Department of Cellular Biology, Immunology and Neurosciences, Medicine School, University of Barcelona, Barcelona, Spain
| | - Kevin W. Collon
- Department of Neurology, University of Michigan Medical Center, Ann Arbor, Michigan, United States of America
| | - Helen Zhang
- Department of Neurology, University of Michigan Medical Center, Ann Arbor, Michigan, United States of America
| | - Jack M. Parent
- Department of Neurology, University of Michigan Medical Center, Ann Arbor, Michigan, United States of America
| | | | - Ernest Giralt
- Institute for Research in Biomedicine (IRB), Barcelona, Spain
| | | | | | | | - Pablo Villoslada
- Center of Neuroimmunology, Institut d'investigacions Biomèdiques August Pi I Sunyer (IDIBAPS) - Hospital Clinic of Barcelona, Barcelona, Spain
| | - Rafael Franco
- CIMA, Neurosciences Division, University of Navarra, Pamplona, Spain
- Oncology Area, Lung Cancer Unit, Center for Biomedical Research of la Rioja (CIBIR), Logroño, Spain
- Department of Neurosciences, University of Basque Country, Achucarro Basque Center for Neuroscience, Leioa, Spain
- Institute of Neurobiology, Slovak Academy of Sciences, Kosice, Slovak Republic
- Centro de Investigaciones Biomédicas en red en Enfermedades Neurodegenerativas (CIBERNED), Madrid, Spain
- Department of Cellular Biology, Immunology and Neurosciences, Medicine School, University of Barcelona, Barcelona, Spain
- Department of Neurology, University of Michigan Medical Center, Ann Arbor, Michigan, United States of America
- Institute for Research in Biomedicine (IRB), Barcelona, Spain
- Universidad de Castilla la Mancha, Albacete, Spain
- Department of Biochemistry and Molecular Biology, School of Biology, University of Barcelona, Barcelona, Spain
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Taslidere E, Esrefoglu M, Elbe H, Cetin A, Ates B. Protective effects of melatonin and quercetin on experimental lung injury induced by carbon tetrachloride in rats. Exp Lung Res 2014; 40:59-65. [PMID: 24447267 DOI: 10.3109/01902148.2013.866181] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
INTRODUCTION Exposure to carbon tetrachloride (CCl4), a well-known toxicant, causes tissue damage by inducing oxidative stress via formation of free radicals. The fundamental structure of the organs of rats and humans is similar, so administration of CCl4 to rats is an accepted experimental model to produce oxidative damage to various tissues including pulmonary tissue. In this study, we evaluated the protective capacity of melatonin and quercetin against CCl4-induced oxidative lung damage in rats. MATERIAL-METHODS Rats were divided into five groups each containing seven rats as follows: Control group, Olive oil group CCl4 group, CCl4+Melatonin, and CCl4+Quercetin group. The tissue samples were processed by routine histological and biochemical procedures. Sections were stained with Hematoxylin-eosin and Masson's trichrome. Histopathologic damage score was calculated. Malondialdehyde (MDA) and glutathione (GSH) levels and catalase (CAT) activities were assayed. RESULTS The lung sections of control groups showed normal histological characteristics. Fibrosis, interstitial hemorrhage, epithelial desquamation in bronchiole and alveoli, intra-alveolar edema, leukocyte, and macrophage infiltration were observed in lung sections of rats exposed to CCl4 alone. The findings were reduced in the treatments groups. The MDA level in the CCI4 group were significantly higher than in the other groups (p < .001), and the CAT and GSH levels in the CCI4+Mel and CCI4+Quer groups were significantly higher than in the CCI4 group (p < .05). CONCLUSION In conclusion, we suggest that agents with antioxidant properties such as melatonin and quercetin may have positive effects in the treatment of pulmonary diseases characterized by especially edema, inflammation, and fibrosis.
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Affiliation(s)
- Elif Taslidere
- 1Department of Histology and Embriyology, Medical Faculty, Inonu University, Malatya, Turkey
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Frau M, Feo CF, Feo F, Pascale RM. New insights on the role of epigenetic alterations in hepatocellular carcinoma. J Hepatocell Carcinoma 2014; 1:65-83. [PMID: 27508177 PMCID: PMC4918272 DOI: 10.2147/jhc.s44506] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Emerging evidence assigns to epigenetic mechanisms heritable differences in gene function that come into being during cell development or via the effect of environmental factors. Epigenetic deregulation is strongly involved in the development of hepatocellular carcinoma (HCC). It includes changes in methionine metabolism, promoter hypermethylation, or increased proteasomal degradation of oncosuppressors, as well as posttranscriptional deregulation by microRNA or messenger RNA (mRNA) binding proteins. Alterations in the methylation of the promoter of methyl adenosyltransferase MAT1A and MAT2A genes in HCC result in decreased S-adenosylmethionine levels, global DNA hypomethylation, and deregulation of signal transduction pathways linked to methionine metabolism and methyl adenosyltransferases activity. Changes in S-adenosylmethionine levels may also depend on MAT1A mRNA destabilization associated with MAT2A mRNA stabilization by specific proteins. Decrease in MAT1A expression has also been attributed to miRNA upregulation in HCC. A complex deregulation of miRNAs is also strongly involved in hepatocarcinogenesis, with up-regulation of different miRNAs targeting oncosuppressor genes and down-regulation of miRNAs targeting genes involved in cell-cycle and signal transduction control. Oncosuppressor gene down-regulation in HCC is also induced by promoter hypermethylation or posttranslational deregulation, leading to proteasomal degradation. The role of epigenetic changes in hepatocarcinogenesis has recently suggested new promising therapeutic approaches for HCC on the basis of the administration of methylating agents, inhibition of methyl adenosyltransferases, and restoration of the expression of tumor-suppressor miRNAs.
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Affiliation(s)
- Maddalena Frau
- Department of Clinical and Experimental Medicine, Division of Experimental Pathology and Oncology, University of Sassari, Sassari, Italy
| | - Claudio F Feo
- Department of Clinical and Experimental Medicine, Division of Surgery, University of Sassari, Sassari, Italy
| | - Francesco Feo
- Department of Clinical and Experimental Medicine, Division of Experimental Pathology and Oncology, University of Sassari, Sassari, Italy
| | - Rosa M Pascale
- Department of Clinical and Experimental Medicine, Division of Experimental Pathology and Oncology, University of Sassari, Sassari, Italy
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Fan J, Wu Z, Zhao T, Sun Y, Ye H, Xu R, Zeng X. Characterization, antioxidant and hepatoprotective activities of polysaccharides from Ilex latifolia Thunb. Carbohydr Polym 2014; 101:990-7. [DOI: 10.1016/j.carbpol.2013.10.037] [Citation(s) in RCA: 109] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2013] [Revised: 10/06/2013] [Accepted: 10/12/2013] [Indexed: 11/15/2022]
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Expression and function of methylthioadenosine phosphorylase in chronic liver disease. PLoS One 2013; 8:e80703. [PMID: 24324622 PMCID: PMC3855635 DOI: 10.1371/journal.pone.0080703] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2013] [Accepted: 10/07/2013] [Indexed: 12/21/2022] Open
Abstract
To study expression and function of methylthioadenosine phosphorylase (MTAP), the rate-limiting enzyme in the methionine and adenine salvage pathway, in chronic liver disease.
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Frau M, Feo F, Pascale RM. Pleiotropic effects of methionine adenosyltransferases deregulation as determinants of liver cancer progression and prognosis. J Hepatol 2013; 59:830-41. [PMID: 23665184 DOI: 10.1016/j.jhep.2013.04.031] [Citation(s) in RCA: 106] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/28/2013] [Revised: 04/15/2013] [Accepted: 04/23/2013] [Indexed: 12/13/2022]
Abstract
Downregulation of liver-specific MAT1A gene, encoding S-adenosylmethionine (SAM) synthesizing isozymes MATI/III, and upregulation of widely expressed MAT2A, encoding MATII isozyme, known as MAT1A:MAT2A switch, occurs in hepatocellular carcinoma (HCC). Being inhibited by its reaction product, MATII isoform upregulation cannot compensate for MATI/III decrease. Therefore, MAT1A:MAT2A switch contributes to decrease in SAM level in rodent and human hepatocarcinogenesis. SAM administration to carcinogen-treated rats prevents hepatocarcinogenesis, whereas MAT1A-KO mice, characterized by chronic SAM deficiency, exhibit macrovesicular steatosis, mononuclear cell infiltration in periportal areas, and HCC development. This review focuses upon the pleiotropic changes, induced by MAT1A/MAT2A switch, associated with HCC development. Epigenetic control of MATs expression occurs at transcriptional and post-transcriptional levels. In HCC cells, MAT1A/MAT2A switch is associated with global DNA hypomethylation, decrease in DNA repair, genomic instability, and signaling deregulation including c-MYC overexpression, rise in polyamine synthesis, upregulation of RAS/ERK, IKK/NF-kB, PI3K/AKT, and LKB1/AMPK axis. Furthermore, decrease in MAT1A expression and SAM levels results in increased HCC cell proliferation, cell survival, and microvascularization. All of these changes are reversed by SAM treatment in vivo or forced MAT1A overexpression or MAT2A inhibition in cultured HCC cells. In human HCC, MAT1A:MAT2A and MATI/III:MATII ratios correlate negatively with cell proliferation and genomic instability, and positively with apoptosis and global DNA methylation. This suggests that SAM decrease and MATs deregulation represent potential therapeutic targets for HCC. Finally, MATI/III:MATII ratio strongly predicts patients' survival length suggesting that MAT1A:MAT2A expression ratio is a putative prognostic marker for human HCC.
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Affiliation(s)
- Maddalena Frau
- Department of Clinical and Experimental Medicine, Laboratory of Experimental Pathology and Oncology, University of Sassari, Sassari, Italy
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Zhang YN, Song M, Ng TB, Zhao L, Liu F. Purification and characterization of antioxidant components from the fruiting bodies of Pleurotus abalonus including 9-beta-d-ribofuranosidoadenine, 5'-deoxy-5'-(methylthio)adenosine, and a triterpenoid. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2013; 36:689-696. [PMID: 23892470 DOI: 10.1016/j.etap.2013.06.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2013] [Revised: 06/07/2013] [Accepted: 06/15/2013] [Indexed: 06/02/2023]
Abstract
Although Pleurotus abalonus is a well-known edible mushroom in Asia, there is a dearth of information on its antioxidant activity. The present report is the first one focused on the purification and characterization of 9-beta-d-ribofuranosidoadenine (ADO), 5'-deoxy-5'-(methylthio) adenosine (MTA) and a triterpenoid complex from P. abalonus. Different antioxidant activities including inhibitory effects on hemolysis and lipid peroxidation in brain and kidney homogenates as well as significant synergistic effect on scavenging of hydroxyl radicals were demonstrated, which lays a foundation for the development of P. abalonus as a natural antioxidant applied in medicine.
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Affiliation(s)
- Ye Ni Zhang
- Department of Microbiology, Nankai University, Tianjin, China
| | - Min Song
- Department of Microbiology, Nankai University, Tianjin, China
| | - Tzi Bun Ng
- School of Biomedical Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China.
| | - Li Zhao
- Tianjin Hospital, Tianjin, China
| | - Fang Liu
- Department of Microbiology, Nankai University, Tianjin, China.
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Zhang D, Li S, Xiong Q, Jiang C, Lai X. Extraction, characterization and biological activities of polysaccharides from Amomum villosum. Carbohydr Polym 2013; 95:114-22. [DOI: 10.1016/j.carbpol.2013.03.015] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2012] [Revised: 02/27/2013] [Accepted: 03/02/2013] [Indexed: 10/27/2022]
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Antioxidant activity and potential hepatoprotective effect of polysaccharides from Cyclina sinensis. Carbohydr Polym 2013; 91:262-8. [DOI: 10.1016/j.carbpol.2012.08.029] [Citation(s) in RCA: 86] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2012] [Revised: 08/02/2012] [Accepted: 08/09/2012] [Indexed: 11/20/2022]
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Tang B, Testa JR, Kruger WD. Increasing the therapeutic index of 5-fluorouracil and 6-thioguanine by targeting loss of MTAP in tumor cells. Cancer Biol Ther 2012; 13:1082-90. [PMID: 22825330 DOI: 10.4161/cbt.21115] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Methylthioadenosine phosphorylase (MTAP), a key enzyme in the catabolism of 5'-deoxy-5'-methylthioadenosine (MTA), catalyzes the formation of adenine and 5-methylthioribose-1-phosphate. MTAP is expressed in all cells throughout the body, but a significant percentage of human tumors have lost MTAP expression, thereby making MTAP-loss a potential therapeutic target. Here, we have tested an MTAP-targeting strategy based on the idea that MTAP-expressing cells can be protected from toxic purine and uracil analogs by addition of MTA, but MTAP-deleted tumor cells cannot. Addition of as little as 10 μM MTA could entirely protect isogenic MTAP (+) , but not MTAP (-) , HT1080 cells from toxicity caused by the chemotherapy agents 6-thioguanine (6TG) or 5-fluorouracil (5FU). Inhibitor studies showed that MTA protection requires functional MTAP activity. Addition of adenine protected both MTAP (+) and MTAP (-) cells from 6TG and 5FU, consistent with the idea that adenine produced from the MTAP reaction competes with 6TG and 5FU for a rate limiting pool of phosphoribosyl-1-pyrophosphate (PRPP), which is required for the conversion of purine and uracil bases into nucleotides. Extracellular MTA can also protect mouse mesothelioma cells from killing by 6-TG or the drug L-alanosine in an MTAP-dependent manner. In addition, MTA can protect non-transformed MTAP (+) mouse embryo fibroblasts from 6TG toxicity. Taken together, our data suggest that the addition of MTA to anti-purine-based chemotherapy may greatly increase the therapeutic index of this class of drugs if used specifically to treat MTAP (-) tumors.
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Affiliation(s)
- Baiqing Tang
- Cancer Biology Program, Fox Chase Cancer Center, Philadelphia, PA, USA
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Lygodium flexuosum extract down regulates the expression of proinflammatory cytokines in CCl4-induced hepatotoxicity. ASIAN PAC J TROP MED 2012; 5:421-6. [PMID: 22575972 DOI: 10.1016/s1995-7645(12)60072-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2011] [Revised: 01/15/2012] [Accepted: 03/15/2012] [Indexed: 11/23/2022] Open
Abstract
OBJECTIVE To examine the downregulation of proinflammatory cytokines in a time-dependent manner on carbon tetrachloride induced toxicity in experimental animals. METHODS CCl(4) (150 μL/100 g) was dissolved in corn oil (1:1 v/v %) and administered orally. Group I was treated as normal control and received corn oil on 8th day. Group II was toxic control and was given a single dose of CCl(4) on 8th days. Group III was treated with Lygodium flexuosum (L. flexuosum) n-hexane extract (200 mg/kg) for 8 days and on 8th day a single dose of CCl(4) was received. Group IV (negative control) received L. flexuosum n-hexane extract (200 mg/kg) alone for 8 days. RESULTS Treatment with n-hexane extract prior to the administration of CCl(4) significantly prevented an increase in serum AST, ALT, LDH activity and lipid peroxidation and prevented the depletion of glutathione (GSH). Rats treated with L. flexuosum had reduced mRNA levels of TGF-β1, TNF-α and IL-1β genes in liver of CCl(4) intoxicated rats when compared to CCl(4) control as evidenced by RT-PCR. CONCLUSIONS The data suggest that L. flexuosum, a widely available fern, significantly reduces CCl(4) induced acute hepatotoxicity by down-regulating the expression of pro-inflammatory cytokines in rats.
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Benight NM, Stoll B, Marini JC, Burrin DG. Preventative oral methylthioadenosine is anti-inflammatory and reduces DSS-induced colitis in mice. Am J Physiol Gastrointest Liver Physiol 2012; 303:G71-82. [PMID: 22556140 PMCID: PMC3404577 DOI: 10.1152/ajpgi.00549.2011] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Methylthioadenosine (MTA) is a precursor of the methionine salvage pathway and has been shown to have anti-inflammatory properties in various models of acute and chronic inflammation. However, the anti-inflammatory properties of MTA in models of intestinal inflammation are not defined. We hypothesized that orally administered MTA would be bioavailable and reduce morbidity associated with experimental colitis. We examined clinical, histological, and molecular markers of disease in mice provided oral MTA before (preventative) or after (therapy) the induction of colitis with 3% dextran sulfate sodium (DSS). We found a reduction in disease activity, weight loss, myeloperoxidase activity, and histological damage in mice given preventative MTA compared with DSS alone. We also found that equivalent supplementation with methionine could not reproduce the anti-inflammatory effects of MTA, and that MTA had no detectable adverse effects in control or DSS mice. Expression microarray analysis of colonic tissue showed several dominant pathways related to inflammatory cytokines/chemokines and extracellular matrix remodeling were upregulation by DSS and suppressed in MTA-supplemented mice. MTA is rapidly absorbed in the gastrointestinal tract and disseminated throughout the body, based on a time course analysis of an oral bolus of MTA. This effect is transient, with MTA levels falling to near baseline within 90 min in most organs. Moreover, MTA did not lead to increased blood or tissue methionine levels, suggesting that its effects are specific. However, MTA provided limited therapeutic benefit when administered after the onset of colitis. Our results show that oral MTA supplementation is a safe and effective strategy to prevent inflammation and tissue injury associated with DSS colitis in mice. Additional studies in chronic inflammatory models are necessary to determine if MTA is a safe and beneficial option for the maintenance of remission in human inflammatory bowel disease.
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Affiliation(s)
- Nancy M. Benight
- 1US Department of Agriculture/Agricltural Research Service, Children's Nutrition Research Center, Baylor College of Medicine, Houston, Texas; and
| | - Barbara Stoll
- 1US Department of Agriculture/Agricltural Research Service, Children's Nutrition Research Center, Baylor College of Medicine, Houston, Texas; and
| | - Juan C. Marini
- 1US Department of Agriculture/Agricltural Research Service, Children's Nutrition Research Center, Baylor College of Medicine, Houston, Texas; and
| | - Douglas G. Burrin
- 1US Department of Agriculture/Agricltural Research Service, Children's Nutrition Research Center, Baylor College of Medicine, Houston, Texas; and ,2Section of Pediatric Gastroenterology, Hepatology and Nutrition, Department of Pediatrics, Baylor College of Medicine, Houston, Texas
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Conditioned media from lung cancer cell line A549 and PC9 inactivate pulmonary fibroblasts by regulating protein phosphorylation. Arch Biochem Biophys 2011; 518:133-41. [PMID: 22209754 DOI: 10.1016/j.abb.2011.12.012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2011] [Revised: 12/16/2011] [Accepted: 12/17/2011] [Indexed: 01/01/2023]
Abstract
Pulmonary fibrosis is a devastating condition resulting from excess extracellular matrix deposition that leads to progressive lung destruction and scarring. In the pathogenesis of fibrotic diseases, activation of myofibroblasts by transforming growth factor-β (TGF-β) plays a crucial role. Since no effective therapy for pulmonary fibrosis is currently recognized, finding an effective antifibrotic agent is an important objective. One approach might be through identification of agents that inactivate myofibroblasts. In the current study we examined the potential of conditioned medium obtained from several types of cells to exhibit myofibroblast inactivating activity. Conditioned media from lung cancer cell lines A549 and PC9 were found to have this action, as shown by its ability to decrease α-smooth muscle actin expression in MRC-5 cells. Subsequently the inhibitory factor was purified from the medium and identified as 5'-deoxy-5'-methylthioadenosine (MTA), and its mechanism of action elucidated. Activation of protein kinase A and cAMP responsive element binding protein (CREB) were detected. MTA inhibited TGF-β-induced mitogen-activated protein kinase activation. Furthermore, the gain-of-function mutant CREB caused inactivation of myofibroblasts. These results show that A549 and PC9 conditioned media have the ability to inactivate myofibroblasts, and that CREB-phosphorylation plays a central role in this process.
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Insights antifibrotic mechanism of methyl palmitate: impact on nuclear factor kappa B and proinflammatory cytokines. Toxicol Appl Pharmacol 2011; 258:134-44. [PMID: 22079257 DOI: 10.1016/j.taap.2011.10.016] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2011] [Revised: 10/24/2011] [Accepted: 10/25/2011] [Indexed: 12/16/2022]
Abstract
Fibrosis accompanies most chronic liver disorders and is a major factor contributing to hepatic failure. Therefore, the need for an effective treatment is evident. The present study was designed to assess the potential antifibrotic effect of MP and whether MP can attenuate the severity of oxidative stress and inflammatory response in chronic liver injury. Male albino rats were treated with either CCl(4) (1 ml/kg, twice a week) and/or MP (300 mg/kg, three times a week) for six weeks. CCl(4)-intoxication significantly increased liver weight, serum aminotransferases, total cholesterol and triglycerides while decreased albumin level and these effects were prevented by co-treatment with MP. As indicators of oxidative stress, CCl(4)-intoxication caused significant glutathione depletion and lipid peroxidation while MP co-treatment preserved them within normal values. As markers of fibrosis, hydroxyproline content and α-SMA expression increased markedly in the CCl(4) group and MP prevented these alterations. Histopathological examination by both light and electron microscope further confirmed the protective efficacy of MP. To elucidate the antifibrotic mechanisms of MP, the expression of NF-κB, iNOS and COX-2 and the tissue levels of TNF-α and nitric oxide were assessed; CCl(4) increased the expression of NF-κB and all downstream inflammatory cascade while MP co-treatment inhibited them. Collectively these findings indicate that MP possesses a potent antifibrotic effect which may be partly a consequence of its antioxidant and anti-inflammatory properties.
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Xu R, Ye H, Sun Y, Tu Y, Zeng X. Preparation, preliminary characterization, antioxidant, hepatoprotective and antitumor activities of polysaccharides from the flower of tea plant (Camellia sinensis). Food Chem Toxicol 2011; 50:2473-80. [PMID: 22033094 DOI: 10.1016/j.fct.2011.10.047] [Citation(s) in RCA: 105] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2011] [Revised: 10/10/2011] [Accepted: 10/12/2011] [Indexed: 01/21/2023]
Abstract
In the present study, the crude polysaccharides from the flowers of tea plant (Camellia sinensis) (TFPS) were prepared with hot water and further fractionated on a DEAE-52 cellulose chromatography to afford three purified fractions of TFPS-1, TFPS-2 and TFPS-3. Then, their preliminary structures, antioxidant and antitumor activities in vitro and hepatoprotective activity in vivo were investigated. Compared with TFPS-2 and TFPS-3, TFPS-1 had relative higher content of sulfate and relative complicated monosaccharide composition. In addition, TFPS-1 and TFPS-3 showed relative stronger antioxidant activity and inhibitory activity on the growth of human gastric cancer BGC-823 cells. For hepatoprotective activity in vivo, we demonstrated that crude TFPS significantly prevented the increase of serum alanine aminotransferase and aspartate aminotransferase levels, reduced the formation of malondialdehyde and enhanced the activities of superoxide dismutase and glutathione peroxidase in carbon tetrachloride-induced liver injury mice. The results suggested that TFPS should be a potent natural polymer with antioxidant, hepatoprotective and antitumor activities.
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Affiliation(s)
- Renjie Xu
- College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, China
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Roe B, Kensicki E, Mohney R, Hall WW. Metabolomic profile of hepatitis C virus-infected hepatocytes. PLoS One 2011; 6:e23641. [PMID: 21853158 PMCID: PMC3154941 DOI: 10.1371/journal.pone.0023641] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2011] [Accepted: 07/21/2011] [Indexed: 02/07/2023] Open
Abstract
Hepatitis C virus (HCV) is capable of disrupting different facets of lipid metabolism and lipids have been shown to play a crucial role in the viral life cycle. The aim of this study was to examine the effect HCV infection has on the hepatocyte metabolome. Huh-7.5 cells were infected using virus produced by the HCV J6/JFH1 cell culture system and cells were harvested 24, 48, and 72-hours following infection. Metabolic profiling was performed using a non-targeted multiple platform methodology combining ultrahigh performance liquid chromatography/tandem mass spectrometry (UHPLC/MS/MS2) and gas chromatography/mass spectrometry (GC/MS). There was a significant increase in a number of metabolites involved in nucleotide synthesis and RNA replication during early HCV infection. NAD levels were also significantly increased along with several amino acids. A number of lipid metabolic pathways were disrupted by HCV infection, resulting in an increase in cholesterol and sphingolipid levels, altered phospholipid metabolism and a possible disruption in mitochondrial fatty acid transport. Fluctuations in 5′-methylthioadenosine levels were also noted, along with alterations in the glutathione synthesis pathway. These results highlight a number of previously unreported metabolic interactions and give a more in depth insight into the effect HCV has on host cell biochemical processes.
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Affiliation(s)
- Barbara Roe
- Centre for Research in Infectious Diseases, School of Medicine and Medical Science, University College Dublin, Belfield, Dublin, Ireland.
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Bertino JR, Waud WR, Parker WB, Lubin M. Targeting tumors that lack methylthioadenosine phosphorylase (MTAP) activity: current strategies. Cancer Biol Ther 2011; 11:627-32. [PMID: 21301207 DOI: 10.4161/cbt.11.7.14948] [Citation(s) in RCA: 102] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Many solid tumors and hematologic malignancies lack expression of the enzyme methylthioadenosine phosphorylase (MTAP), due either to deletion of the MTAP gene or to methylation of the MTAP promoter. In cells that have MTAP, its natural substrate, methylthioadenosine (MTA), generated during polyamine biosynthesis, is cleaved to adenine and 5-methylthioribose-1-phosphate. The latter compound is further metabolized to methionine. Adenine and methionine are further metabolized and hence salvaged. In MTAP-deficient cells, however, MTA is not cleaved and the salvage pathway for adenine and methionine is absent. As a result, MTAP-deficient cells are more sensitive than MTAP-positive cells to inhibitors of de novo purine synthesis and to methionine deprivation. The challenge has been to take advantage of MTAP deficiency, and the changes in metabolism that follow, to design a strategy for targeted treatment. In this review, the frequency of MTAP-deficiency is presented and past and recent strategies to target such deficient cells are discussed, including one in which MTA is administered, followed by very high doses of a toxic purine or pyrimidine analog. In normal host cells, adenine, generated from MTA, blocks conversion of the analog to its toxic nucleotide. In MTAP-deficient tumor cells, conversion proceeds and the tumor cells are selectively killed. Successful mouse studies using this novel strategy were recently reported.
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Affiliation(s)
- Joseph R Bertino
- Departments of Medicine and Pharmacology, The Cancer Institute of NJ, Robert Wood Johnson Medical School, New Brunswick, USA.
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Latasa MU, Gil-Puig C, Fernández-Barrena MG, Rodríguez-Ortigosa CM, Banales JM, Urtasun R, Goñi S, Méndez M, Arcelus S, Juanarena N, Recio JA, Lotersztajn S, Prieto J, Berasain C, Corrales FJ, Lecanda J, Ávila MA. Oral methylthioadenosine administration attenuates fibrosis and chronic liver disease progression in Mdr2-/- mice. PLoS One 2010; 5:e15690. [PMID: 21209952 PMCID: PMC3012093 DOI: 10.1371/journal.pone.0015690] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2010] [Accepted: 11/21/2010] [Indexed: 01/18/2023] Open
Abstract
BACKGROUND Inflammation and fibrogenesis are directly related to chronic liver disease progression, including hepatocellular carcinoma (HCC) development. Currently there are few therapeutic options available to inhibit liver fibrosis. We have evaluated the hepatoprotective and anti-fibrotic potential of orally-administered 5'-methylthioadenosine (MTA) in Mdr2(-/-) mice, a clinically relevant model of sclerosing cholangitis and spontaneous biliary fibrosis, followed at later stages by HCC development. METHODOLOGY MTA was administered daily by gavage to wild type and Mdr2(-/-) mice for three weeks. MTA anti-inflammatory and anti-fibrotic effects and potential mechanisms of action were examined in the liver of Mdr2(-/-) mice with ongoing fibrogenesis and in cultured liver fibrogenic cells (myofibroblasts). PRINCIPAL FINDINGS MTA treatment reduced hepatomegaly and liver injury. α-Smooth muscle actin immunoreactivity and collagen deposition were also significantly decreased. Inflammatory infiltrate, the expression of the cytokines IL6 and Mcp-1, pro-fibrogenic factors like TGFβ2 and tenascin-C, as well as pro-fibrogenic intracellular signalling pathways were reduced by MTA in vivo. MTA inhibited the activation and proliferation of isolated myofibroblasts and down-regulated cyclin D1 gene expression at the transcriptional level. The expression of JunD, a key transcription factor in liver fibrogenesis, was also reduced by MTA in activated myofibroblasts. CONCLUSIONS/SIGNIFICANCE Oral MTA administration was well tolerated and proved its efficacy in reducing liver inflammation and fibrosis. MTA may have multiple molecular and cellular targets. These include the inhibition of inflammatory and pro-fibrogenic cytokines, as well as the attenuation of myofibroblast activation and proliferation. Downregulation of JunD and cyclin D1 expression in myofibroblasts may be important regarding the mechanism of action of MTA. This compound could be a good candidate to be tested for the treatment of (biliary) liver fibrosis.
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Affiliation(s)
- M. Ujue Latasa
- Division of Hepatology and Gene Therapy, CIMA, University of Navarra, Pamplona, Spain
| | - Carmen Gil-Puig
- Division of Hepatology and Gene Therapy, CIMA, University of Navarra, Pamplona, Spain
- Digna Biotech, Madrid, Spain
| | - Maite G. Fernández-Barrena
- Division of Hepatology and Gene Therapy, CIMA, University of Navarra, Pamplona, Spain
- CIBERehd, University Clinic, University of Navarra, Pamplona, Spain
| | - Carlos M. Rodríguez-Ortigosa
- Division of Hepatology and Gene Therapy, CIMA, University of Navarra, Pamplona, Spain
- CIBERehd, University Clinic, University of Navarra, Pamplona, Spain
| | - Jesús M. Banales
- Division of Hepatology and Gene Therapy, CIMA, University of Navarra, Pamplona, Spain
- CIBERehd, University Clinic, University of Navarra, Pamplona, Spain
| | - Raquel Urtasun
- Division of Hepatology and Gene Therapy, CIMA, University of Navarra, Pamplona, Spain
| | - Saioa Goñi
- Division of Hepatology and Gene Therapy, CIMA, University of Navarra, Pamplona, Spain
| | - Miriam Méndez
- Division of Hepatology and Gene Therapy, CIMA, University of Navarra, Pamplona, Spain
| | - Sara Arcelus
- CIBERehd, University Clinic, University of Navarra, Pamplona, Spain
| | - Nerea Juanarena
- Division of Hepatology and Gene Therapy, CIMA, University of Navarra, Pamplona, Spain
| | - Juan A. Recio
- Vall d'Hebron Research Institute, Institute of Oncology and Hospital, Barcelona, Spain
| | - Sophie Lotersztajn
- Inserm, U955, Créteil, France
- Université Paris-Est, Faculté de Médecine, UMR-S955, Créteil, France
| | - Jesús Prieto
- Division of Hepatology and Gene Therapy, CIMA, University of Navarra, Pamplona, Spain
- CIBERehd, University Clinic, University of Navarra, Pamplona, Spain
| | - Carmen Berasain
- Division of Hepatology and Gene Therapy, CIMA, University of Navarra, Pamplona, Spain
| | - Fernando J. Corrales
- Division of Hepatology and Gene Therapy, CIMA, University of Navarra, Pamplona, Spain
| | - Jon Lecanda
- Division of Hepatology and Gene Therapy, CIMA, University of Navarra, Pamplona, Spain
- Digna Biotech, Madrid, Spain
| | - Matías A. Ávila
- Division of Hepatology and Gene Therapy, CIMA, University of Navarra, Pamplona, Spain
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Abstract
The liver is an important metabolic and detoxification organ. As liver cells are extremely vulnerable to chemical substances, accumulation of metabolites, and viral infection, liver cell injury, which may induce cirrhosis and liver cancer, is often caused. S-adenosyl-L-methionine (SAMe), a natural substance present in various organisms, plays an important role in the regeneration and differentiation of liver cells and in regulating the sensitivity of liver cells to various types of injuries. Previously, SAMe had been widely used in the treatment of cholestatic liver disease. Recent studies have shown that SAMe as a methyl donor, can induce gene hypermethylation and reverse the overall low methylation, inhibit oncogene expression, reduce tumor invasiveness, and slow tumor metastasis. These findings open up new applications for SAMe in cancer prevention and treatment.
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Yamaji S, Droggiti A, Lu SC, Martinez-Chantar ML, Warner A, Varela-Rey M. S-Adenosylmethionine regulates connexins sub-types expressed by hepatocytes. Eur J Cell Biol 2010; 90:312-22. [PMID: 21093098 DOI: 10.1016/j.ejcb.2010.09.007] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2009] [Revised: 09/20/2010] [Accepted: 09/20/2010] [Indexed: 01/01/2023] Open
Abstract
Intercellular communication via GAP Junctions plays an important role in tissue homeostasis, apoptosis, carcinogenesis, cell proliferation and differentiation. Hepatocyte connexins (Cx) 26 and 32 levels are decreased during the de-differentiation process of primary hepatocytes in culture, a situation that is also characterized by a decrease in S-Adenosylmethionine (SAMe) levels. In this current study, we show that SAMe supplementation in cultured hepatocytes every 12h, leads to an up-regulation of Cx26 and 32 mRNA and protein levels and blocks culture-induced Cx43 expression, although it failed to increase Cx26 and 32 membrane localization and GAP junction intracellular communication. SAMe reduced nuclear β-catenin accumulation, which is known to stimulate the TCF/LEF-dependent gene transcription of Cx43. Moreover SAMe-induced reduction in Cx43 and β-catenin was prevented by the proteasome inhibitor MG132, and was not mediated by GSK3 activity. SAMe, and its metabolite 5'-methylthioadenosine (MTA) increased Cx26 mRNA in a process partially mediated by Adenosine A(2A) receptors but independent of PKA. Finally livers from MAT1A knockout mice, characterized by low hepatic SAMe levels, express higher Cx43 and lower Cx26 and 32 protein levels than control mice. These results suggest that SAMe maintains a characteristic expression pattern of the different Cxs in hepatocytes by differentially regulating their levels.
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Affiliation(s)
- Sachie Yamaji
- Department of Cell and Developmental Biology (formerly Anatomy and Developmental Biology), University College London, London, UK
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Andreu-Pérez P, Hernandez-Losa J, Moliné T, Gil R, Grueso J, Pujol A, Cortés J, Avila MA, Recio JA. Methylthioadenosine (MTA) inhibits melanoma cell proliferation and in vivo tumor growth. BMC Cancer 2010; 10:265. [PMID: 20529342 PMCID: PMC2891639 DOI: 10.1186/1471-2407-10-265] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2010] [Accepted: 06/08/2010] [Indexed: 12/13/2022] Open
Abstract
Background Melanoma is the most deadly form of skin cancer without effective treatment. Methylthioadenosine (MTA) is a naturally occurring nucleoside with differential effects on normal and transformed cells. MTA has been widely demonstrated to promote anti-proliferative and pro-apoptotic responses in different cell types. In this study we have assessed the therapeutic potential of MTA in melanoma treatment. Methods To investigate the therapeutic potential of MTA we performed in vitro proliferation and viability assays using six different mouse and human melanoma cell lines wild type for RAS and BRAF or harboring different mutations in RAS pathway. We also have tested its therapeutic capabilities in vivo in a xenograft mouse melanoma model and using variety of molecular techniques and tissue culture we investigated its anti-proliferative and pro-apoptotic properties. Results In vitro experiments showed that MTA treatment inhibited melanoma cell proliferation and viability in a dose dependent manner, where BRAF mutant melanoma cell lines appear to be more sensitive. Importantly, MTA was effective inhibiting in vivo tumor growth. The molecular analysis of tumor samples and in vitro experiments indicated that MTA induces cytostatic rather than pro-apoptotic effects inhibiting the phosphorylation of Akt and S6 ribosomal protein and inducing the down-regulation of cyclin D1. Conclusions MTA inhibits melanoma cell proliferation and in vivo tumor growth particularly in BRAF mutant melanoma cells. These data reveal a naturally occurring drug potentially useful for melanoma treatment.
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Affiliation(s)
- Pedro Andreu-Pérez
- Medical Oncology Research Program, Vall d'Hebron Research Institute, Vall d'Hebron Institute of Oncology Vall d'Hebron Hospital Barcelona 08035, Spain
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Frau M, Biasi F, Feo F, Pascale RM. Prognostic markers and putative therapeutic targets for hepatocellular carcinoma. Mol Aspects Med 2010; 31:179-93. [PMID: 20176048 DOI: 10.1016/j.mam.2010.02.007] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2009] [Accepted: 02/16/2010] [Indexed: 02/08/2023]
Abstract
Hepatocellular carcinoma (HCC) is the fifth most frequent human cancer and a fatal disease. Therapies with pharmacological agents do not improve the prognosis of patients with unresectable HCC. This emphasizes the need to identify new targets for early diagnosis, chemoprevention, and treatment of the disease. Available evidence indicates that clinical outcome of HCC could reflect the genetic predisposition to cancer development and progression. Numerous loci controlling HCC progression have been identified in rodents. In this review, we describe results of recent studies on effector mechanisms of susceptibility/resistance genes, responsible for HCC progression, aimed at identifying new putative prognostic markers and therapeutic targets of this tumor. Highest c-myc amplification and overexpression, alterations of iNOS crosstalk with IKK/NF-kB and RAS/ERK signaling, ubiquitination of ERK and cell cycle inhibitors, and deregulation of FOXM1 and cell cycle key genes occur in rapidly progressing dysplastic nodules and HCC, induced in genetic susceptible rat strains, compared to the lesions of resistant rats. Notably, alterations of these mechanisms in human HCC subtypes with poorer or better prognosis, are similar to those present in genetically susceptible and resistant rats, respectively, and function as prognostic markers and therapeutic targets. Attempts to cure advanced HCC by molecular therapy directed against specific targets led to modest survival benefit. Thus, efforts are necessary to identify and test, in pre-clinical and clinical studies, new therapeutic targets for combined molecular treatments of HCC. They may take advantage from the comparative analysis of signal transduction in HCCs differently prone to progress, in rats and humans.
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Affiliation(s)
- Maddalena Frau
- Department of Biomedical Sciences, Division of Experimental Pathology and Oncology, University of Sassari, 07100 Sassari, Italy
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Dhanasekaran M, Ignacimuthu S, Agastian P. Potential hepatoprotective activity of ononitol monohydrate isolated from Cassia tora L. on carbon tetrachloride induced hepatotoxicity in wistar rats. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2009; 16:891-895. [PMID: 19345078 DOI: 10.1016/j.phymed.2009.02.006] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2008] [Revised: 01/16/2009] [Accepted: 02/06/2009] [Indexed: 05/27/2023]
Abstract
Ononitol monohydrate, structurally similar to glycoside was isolated from Cassia tora L. leaves. Fifty Male rats were divided into five groups. Group I served as normal control. Group II, III and IV rats were induced hepatotoxicity by CCl(4) administering single dose of CCl(4) on 8th day only. Group III was treated with ononitol monohydrate (20mg/kg body weight) and group IV was treated with reference drug silymarin (20mg/kg body weight) both dissolved in corn oil and administering for 8 days. Ononitol monohydrate with corn oil alone was given for 8 days (group V). At the end of the experimental period all the animals were sacrificed and analyzed for biochemical parameters to assess the effect of ononitol monohydrate treatment in CCl(4) induced hepatotoxicity. In in vivo study, ononitol monohydrate decreased the levels of serum transaminase, lipid peroxidation and TNF-alpha but increased the levels of antioxidant and hepatic glutathione enzyme activities. Compared with reference drug silymarin ononitol monohydrate possessed high hepatoprotective activity. Histopathological results also suggested the hepatoprotective activity of ononitol monohydrate with no adverse effect. Hence we conclude that ononitol monohydrate is a potent hepatoprotective agent.
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Affiliation(s)
- Muniyappan Dhanasekaran
- Division of Ethnopharmacology, Entomology Research Institute, Loyola College, Tamil Nadu, India
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Selective killing of tumors deficient in methylthioadenosine phosphorylase: a novel strategy. PLoS One 2009; 4:e5735. [PMID: 19478948 PMCID: PMC2684647 DOI: 10.1371/journal.pone.0005735] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2009] [Accepted: 05/05/2009] [Indexed: 11/19/2022] Open
Abstract
Background The gene for methylthioadenosine phosphorylase (MTAP) lies on 9p21, close to the gene CDKN2A that encodes the tumor suppressor proteins p16 and p14ARF. MTAP and CDKN2A are homozygously co-deleted, with a frequency of 35 to 70%, in lung and pancreatic cancer, glioblastoma, osteosarcoma, soft-tissue sarcoma, mesothelioma, and T-cell acute lymphoblastic leukemia. In normal cells, but not in tumor cells lacking MTAP, MTAP cleaves the natural substrate, 5′-deoxy-5′-methylthioadenosine (MTA), to adenine and 5-methylthioribose-1-phosphate (MTR-1-P), which are then converted to adenine nucleotides and methionine. This distinct difference between normal MTAP-positive cells and tumor MTAP-negative cells led to several proposals for therapy. We offer a novel strategy in which both MTA and a toxic adenine analog, such as 2,6-diaminopurine (DAP), 6-methylpurine (MeP), or 2-fluoroadenine (F-Ade), are administered. In MTAP-positive cells, abundant adenine, generated from supplied MTA, competitively blocks the conversion of an analog, by adenine phosphoribosyltransferase (APRT), to its active nucleotide form. In MTAP-negative tumor cells, the supplied MTA cannot generate adenine; hence conversion of the analog is not blocked. Principal Findings We show that this combination treatment – adenine analog plus MTA – kills MTAP-negative A549 lung tumor cells, while MTAP-positive human fibroblasts (HF) are protected. In co-cultures of the breast tumor cell line, MCF-7, and HF cells, MCF-7 is inhibited or killed, while HF cells proliferate robustly. 5-fluorouracil (5-FU) and 6-thioguanine (6-TG) may also be used with our strategy. Though neither analog is activated by APRT, in MTAP-positive cells, adenine produced from supplied MTA blocks conversion of 5-FU and 6-TG to their toxic nucleotide forms by competing for 5-phosphoribosyl-1-pyrophosphate (PRPP). The combination of MTA with 5-FU or 6-TG, in the treatment of MTAP-negative tumors, may produce a significantly improved therapeutic index. Conclusion We describe a selective strategy to kill tumor cells lacking MTAP.
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