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Dang XL, Yang LF, Shi L, Li LF, He P, Chen J, Zheng BJ, Yang P, Wen AD. Post-treatment with glycyrrhizin can attenuate hepatic mitochondrial damage induced by acetaminophen in mice. Exp Biol Med (Maywood) 2021; 246:1219-1227. [PMID: 33342284 PMCID: PMC8142107 DOI: 10.1177/1535370220977823] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2020] [Accepted: 11/03/2020] [Indexed: 11/16/2022] Open
Abstract
Overdose of acetaminophen (APAP) is responsible for the most cases of acute liver failure worldwide. Hepatic mitochondrial damage mediated by neuronal nitric oxide synthase- (nNOS) induced liver protein tyrosine nitration plays a critical role in the pathophysiology of APAP hepatotoxicity. It has been reported that pre-treatment or co-treatment with glycyrrhizin can protect against hepatotoxicity through prevention of hepatocellular apoptosis. However, the majority of APAP-induced acute liver failure cases are people intentionally taking the drug to commit suicide. Any preventive treatment is of little value in practice. In addition, the hepatocellular damage induced by APAP is considered to be oncotic necrosis rather than apoptosis. In the present study, our aim is to investigate if glycyrrhizin can be used therapeutically and the underlying mechanisms of APAP hepatotoxicity protection. Hepatic damage was induced by 300 mg/kg APAP in balb/c mice, followed with administration of 40, 80, or 160 mg/kg glycyrrhizin 90 min later. Mice were euthanized and harvested at 6 h post-APAP. Compared with model controls, glycyrrhizin post-treatment attenuated hepatic mitochondrial and hepatocellular damages, as indicated by decreased serum glutamate dehydrogenase, alanine aminotransferase, and aspartate aminotransferase activities as well as ameliorated mitochondrial swollen, distortion, and hepatocellular necrosis. Notably, 80 mg/kg glycyrrhizin inhibited hepatic nNOS activity and its mRNA and protein expression levels by 16.9, 14.9, and 28.3%, respectively. These results were consistent with the decreased liver nitric oxide content and liver protein tyrosine nitration indicated by 3-nitrotyrosine staining. Moreover, glycyrrhizin did not affect the APAP metabolic activation, and the survival rate of ALF mice was increased by glycyrrhizin. The present study indicates that post-treatment with glycyrrhizin can dose-dependently attenuate hepatic mitochondrial damage and inhibit the up-regulation of hepatic nNOS induced by APAP. Glycyrrhizin shows promise as drug for the treatment of APAP hepatotoxicity.
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Affiliation(s)
- Xue-Liang Dang
- Department of Pharmacy, Tangdu Hospital, Fourth Military Medical University, Xi'an 710032, China
- Department of Pharmacy, Xijing Hospital, Fourth Military Medical University, Xi'an 710038, China
| | - Long-Fei Yang
- Departments of Medical Laboratory and Research Center, Tangdu Hospital, Fourth Military Medical University, Xi'an 710038, China
| | - Lei Shi
- Department of Pharmacy, Xijing Hospital, Fourth Military Medical University, Xi'an 710038, China
| | - Long-Fei Li
- Department of Pharmacy, Xijing Hospital, Fourth Military Medical University, Xi'an 710038, China
| | - Ping He
- Renji Hospital, Medical School of Shanghai Jiaotong University, Shanghai 200127, China
| | - Jie Chen
- Renji Hospital, Medical School of Shanghai Jiaotong University, Shanghai 200127, China
| | - Bei-Jie Zheng
- Renji Hospital, Medical School of Shanghai Jiaotong University, Shanghai 200127, China
| | - Peng Yang
- Department of Pharmacy, Xijing Hospital, Fourth Military Medical University, Xi'an 710038, China
| | - Ai-Dong Wen
- Department of Pharmacy, Tangdu Hospital, Fourth Military Medical University, Xi'an 710032, China
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Shami GJ, Cheng D, Verhaegh P, Koek G, Wisse E, Braet F. Three-dimensional ultrastructure of giant mitochondria in human non-alcoholic fatty liver disease. Sci Rep 2021; 11:3319. [PMID: 33558594 PMCID: PMC7870882 DOI: 10.1038/s41598-021-82884-z] [Citation(s) in RCA: 44] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2020] [Accepted: 01/25/2021] [Indexed: 12/16/2022] Open
Abstract
Giant mitochondria are peculiarly shaped, extremely large mitochondria in hepatic parenchymal cells, the internal structure of which is characterised by atypically arranged cristae, enlarged matrix granules and crystalline inclusions. The presence of giant mitochondria in human tissue biopsies is often linked with cellular adversity, caused by toxins such as alcohol, xenobiotics, anti-cancer drugs, free-radicals, nutritional deficiencies or as a consequence of high fat Western diets. To date, non-alcoholic fatty liver disease is the most prevalent liver disease in lipid dysmetabolism, in which mitochondrial dysfunction plays a crucial role. It is not well understood whether the morphologic characteristics of giant mitochondria are an adaption or caused by such dysfunction. In the present study, we employ a complementary multimodal imaging approach involving array tomography and transmission electron tomography in order to comparatively analyse the structure and morphometric parameters of thousands of normal- and giant mitochondria in four patients diagnosed with non-alcoholic fatty liver disease. In so doing, we reveal functional alterations associated with mitochondrial gigantism and propose a mechanism for their formation based on our ultrastructural findings.
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Affiliation(s)
- Gerald J Shami
- School of Medical Sciences (Discipline of Anatomy and Histology), The University of Sydney, Camperdown, NSW, 2006, Australia.
| | - Delfine Cheng
- School of Medical Sciences (Discipline of Anatomy and Histology), The University of Sydney, Camperdown, NSW, 2006, Australia
| | - Pauline Verhaegh
- Department of Internal Medicine Division of Gastroenterology and Hepatology, Maastricht University Medical Centre, Maastricht, The Netherlands
| | - Ger Koek
- Department of Internal Medicine Division of Gastroenterology and Hepatology, Maastricht University Medical Centre, Maastricht, The Netherlands
| | - Eddie Wisse
- Maastricht MultiModal Molecular Imaging Institute, Division of Nanoscopy, Maastricht University, Maastricht, The Netherlands
| | - Filip Braet
- School of Medical Sciences (Discipline of Anatomy and Histology), The University of Sydney, Camperdown, NSW, 2006, Australia
- Sydney Microscopy & Microanalysis, The University of Sydney, Camperdown, NSW, 2006, Australia
- Cellular Imaging Facility, Charles Perkins Centre, The University of Sydney, Camperdown, NSW, 2006, Australia
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Wen F, Shi Z, Liu X, Tan Y, Wei L, Zhu X, Zhang H, Zhu X, Meng X, Ji W, Yang M, Lu Z. Acute Elevated Resistin Exacerbates Mitochondrial Damage and Aggravates Liver Steatosis Through AMPK/PGC-1α Signaling Pathway in Male NAFLD Mice. Horm Metab Res 2021; 53:132-144. [PMID: 33302316 DOI: 10.1055/a-1293-8250] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Resistin was identified as a link between obesity and insulin resistance and is associated with many diseases in mice. Deciphering the related development and molecular mechanism is necessary for the treatment of these diseases. Previous studies have revealed that increased resistin levels are correlated with lipid accumulation and play a role in non-alcoholic fatty liver disease (NAFLD) development. However, the exact mechanisms underlying these processes remain unclear. To further clarify whether acute elevated resistin level exacerbated liver steatosis, a high-fat diet-induced NAFLD animal model was used and treated with or without resistin for 6 days. We discovered that resistin altered mitochondrial morphology, decreased mitochondrial content, and increased lipid accumulation in HFD mice. qRT-PCR and western blot analysis showed that acute elevated resistin significantly altered the gene expression of mitochondrial biogenesis and liver lipid metabolism molecules in HFD mice. Consequently, in vitro experiments verified that resistin reduced the mitochondrial content, impaired the mitochondrial function and increased the lipid accumulation of palmitate-treated HepG2 cells. Additionally, we demonstrated that resistin upregulated proinflammatory factors, which confirmed that resistin promoted the development of inflammation in NAFLD mice and palmitate-treated HepG2 cells. Signaling-transduction analysis demonstrated that acute elevated resistin aggravated liver steatosis through AMPK/PGC-1α pathway in male mice. This reveals a novel pathway through which lipogenesis is induced by resistin and suggests that maintaining mitochondrial homeostasis may be key to treatments for preventing resistin-induced NAFLD aggravation.
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Affiliation(s)
- Fengyun Wen
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, Henan, P. R. China
| | - Zhuoyan Shi
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, Henan, P. R. China
| | - Xiaoping Liu
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, Henan, P. R. China
| | - Yuguang Tan
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, Henan, P. R. China
| | - Lan Wei
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, Henan, P. R. China
| | - Xuemin Zhu
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, Henan, P. R. China
| | - Hui Zhang
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, Henan, P. R. China
| | - Xiaohuan Zhu
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, Henan, P. R. China
| | - Xiangmiao Meng
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, Henan, P. R. China
| | - Weixia Ji
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, Henan, P. R. China
| | - Mengting Yang
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, Henan, P. R. China
| | - Zhaoxuan Lu
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, Henan, P. R. China
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Xu G, Yan T, Peng Q, Li H, Wu W, Yi X, Zhao Y. Overexpression of the Lias gene attenuates hepatic steatosis in Leprdb/db mice. J Endocrinol 2021; 248:119-131. [PMID: 33263565 DOI: 10.1530/joe-19-0606] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/23/2020] [Accepted: 11/24/2020] [Indexed: 11/08/2022]
Abstract
Oxidative stress is proposed to be involved in nonalcoholic fatty liver disease (NAFLD). However, antioxidant therapy results in controversial outcomes. Therefore, we generated a new antioxidant/NAFLD mouse model, LiasHigh/HighLeprdb/db mice, by crossbreeding Leprdb/db mice, an obesity mouse model, with LiasHigh/High mice, generated by overexpression of lipoic acid synthase gene (Lias) and having increased endogenous antioxidant capacity, to investigate whether the new model could block the development of NAFLD. We have systemically characterized the novel model based on the main features of human NAFLD, determined the impact of enhanced endogenous antioxidant capacity on the retardation of NAFLD and elucidated the underlying mechanisms using various biological and pathological methods. We found that LiasHigh/HighLeprdb/db mice ameliorated many pathological changes of NAFLD compared with the control. In particular, LiasHigh/HighLeprdb/db mice displayed the improved liver mitochondrial function, reflecting the decline of mitochondrial microvesicular steatosis, and reduced oxidative stress, which mainly contributes to the alleviation of pathologic alterations of the NAFLD progression. Our new model shows that mitochondrial dysfunction is a major pathogenesis for liver steatosis. Overexpression of Lias gene effectively reduces oxidative stress and protects mitochondria, and consequently attenuates NAFLD/NASH.
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Affiliation(s)
- Guangcui Xu
- School of Public Health, Xinxiang Medical University, Xinxiang, Henan Province, China
| | - Tingting Yan
- School of Public Health, Xinxiang Medical University, Xinxiang, Henan Province, China
| | - Qiang Peng
- School of Public Health, Xinxiang Medical University, Xinxiang, Henan Province, China
| | - Haibin Li
- School of Public Health, Xinxiang Medical University, Xinxiang, Henan Province, China
| | - Weidong Wu
- School of Public Health, Xinxiang Medical University, Xinxiang, Henan Province, China
| | - Xianwen Yi
- Lineberger Comprehensive Cancer Center, University of North Carolina, Chapel Hill, North Carolina, USA
| | - Yingzheng Zhao
- School of Public Health, Xinxiang Medical University, Xinxiang, Henan Province, China
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Rodrigues RR, Gurung M, Li Z, García-Jaramillo M, Greer R, Gaulke C, Bauchinger F, You H, Pederson JW, Vasquez-Perez S, White KD, Frink B, Philmus B, Jump DB, Trinchieri G, Berry D, Sharpton TJ, Dzutsev A, Morgun A, Shulzhenko N. Transkingdom interactions between Lactobacilli and hepatic mitochondria attenuate western diet-induced diabetes. Nat Commun 2021; 12:101. [PMID: 33397942 PMCID: PMC7782853 DOI: 10.1038/s41467-020-20313-x] [Citation(s) in RCA: 69] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2019] [Accepted: 11/09/2020] [Indexed: 02/06/2023] Open
Abstract
Western diet (WD) is one of the major culprits of metabolic disease including type 2 diabetes (T2D) with gut microbiota playing an important role in modulating effects of the diet. Herein, we use a data-driven approach (Transkingdom Network analysis) to model host-microbiome interactions under WD to infer which members of microbiota contribute to the altered host metabolism. Interrogation of this network pointed to taxa with potential beneficial or harmful effects on host's metabolism. We then validate the functional role of the predicted bacteria in regulating metabolism and show that they act via different host pathways. Our gene expression and electron microscopy studies show that two species from Lactobacillus genus act upon mitochondria in the liver leading to the improvement of lipid metabolism. Metabolomics analyses revealed that reduced glutathione may mediate these effects. Our study identifies potential probiotic strains for T2D and provides important insights into mechanisms of their action.
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Affiliation(s)
| | - Manoj Gurung
- Veterinary Medicine, Oregon State University, Corvallis, OR, USA
| | - Zhipeng Li
- Veterinary Medicine, Oregon State University, Corvallis, OR, USA
| | | | - Renee Greer
- Veterinary Medicine, Oregon State University, Corvallis, OR, USA
| | | | - Franziska Bauchinger
- Department of Microbiology and Ecosystem Science, University of Vienna, Vienna, Austria
| | - Hyekyoung You
- Veterinary Medicine, Oregon State University, Corvallis, OR, USA
| | - Jacob W Pederson
- Veterinary Medicine, Oregon State University, Corvallis, OR, USA
| | | | - Kimberly D White
- Veterinary Medicine, Oregon State University, Corvallis, OR, USA
| | - Briana Frink
- Veterinary Medicine, Oregon State University, Corvallis, OR, USA
| | - Benjamin Philmus
- College of Pharmacy, Oregon State University, Corvallis, OR, USA
| | - Donald B Jump
- College of Public Health and Human Sciences, Oregon State University, Corvallis, OR, USA
| | - Giorgio Trinchieri
- Cancer and Inflammation Program, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
| | - David Berry
- Department of Microbiology and Ecosystem Science, University of Vienna, Vienna, Austria
| | | | - Amiran Dzutsev
- Cancer and Inflammation Program, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
| | - Andrey Morgun
- College of Pharmacy, Oregon State University, Corvallis, OR, USA.
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Lin J, Huang HF, Yang SK, Duan J, Qu SM, Yuan B, Zeng Z. The effect of Ginsenoside Rg1 in hepatic ischemia reperfusion (I/R) injury ameliorates ischemia-reperfusion-induced liver injury by inhibiting apoptosis. Biomed Pharmacother 2020; 129:110398. [PMID: 32603889 DOI: 10.1016/j.biopha.2020.110398] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2019] [Revised: 06/12/2020] [Accepted: 06/13/2020] [Indexed: 12/31/2022] Open
Abstract
Hepatic ischemia reperfusion (I/R) injury (HIRI) HIRI is a complex, multifactorial pathophysiological process and in liver surgery has been known to significantly affect disease prognosis, surgical success rates, and patient survival. Ginsenoside Rgl (Rgl) monomer is one of the main active ingredients of ginseng. Previous studies have demonstrated that Rgl exerts various pharmacological effects through several mechanisms including suppression of apoptosis-related proteins levels, downregulation of inflammatory mediators and as well as antioxidant, which effectively exerts an organ protective effect I/R-induced damage. However, the exact mechanisms of Rg1 on HIRI remain to be elucidated. In the present study, we investigated the protective effect of Rg1 on hepatic ischemia-reperfusion (I/R) injury (HIRI) and explored its underlying molecular mechanism. A rat warm I/R injury model in vivo and an oxygen-glucose deprivation/reperfusion (OGD/R)-treated BRL-3A cell model in vitro were established after pretreating with Rg1(20 mg/kg). The results showed that Rg1 reduced the levels of alanine aminotransferase (ALT) and aspartate aminotransferase (AST). TUNEL staining showed that pretreated with Rg1 inhibited the apoptosis rate compared with the I/R group. Moreover, pretreated with Rg1 significantly reduced the expression of Cyt-C, Caspase-9 and Caspase-3 to inhibit the cell apoptosis. Flow cytometry analysis showed the MMP in the I/R group was significantly increased, whereas pretreated with Rg1 effectively stabilized the MMP compared with the I/R group. in vitro, the proliferation of BRL-3A cells was significantly decreased by the OGD/R treatment, while Rg1 effectively reversed this phenomenon. In addition, western blotting showed that the increase of Cyt-C, Caspase-9 and Caspase-3 was inhibited by H2O2. These observations suggest that Rg1 exerts the protective effect by inhibiting the CypD protein-mediated mitochondrial apoptotic pathway.
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Affiliation(s)
- Jie Lin
- Organ Transplantation Center, The First Affiliated Hospital, Kunming Medical University, Kunming, China
| | - Han-Fei Huang
- Organ Transplantation Center, The First Affiliated Hospital, Kunming Medical University, Kunming, China
| | - Shi-Kun Yang
- Organ Transplantation Center, The First Affiliated Hospital, Kunming Medical University, Kunming, China
| | - Jian Duan
- Organ Transplantation Center, The First Affiliated Hospital, Kunming Medical University, Kunming, China
| | - Si-Ming Qu
- Organ Transplantation Center, The First Affiliated Hospital, Kunming Medical University, Kunming, China
| | - Bo Yuan
- Organ Transplantation Center, The First Affiliated Hospital, Kunming Medical University, Kunming, China
| | - Zhong Zeng
- Organ Transplantation Center, The First Affiliated Hospital, Kunming Medical University, Kunming, China.
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Kuga GK, Gaspar RC, Muñoz VR, Nakandakari SCBR, Breda L, Sandoval BM, Caetano FH, Leme JACDA, Pauli JR, Gomes RJ. Physical training reverses changes in hepatic mitochondrial diameter of Alloxan-induced diabetic rats. Einstein (Sao Paulo) 2018; 16:eAO4353. [PMID: 30088548 PMCID: PMC6110382 DOI: 10.1590/s1679-45082018ao4353] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2017] [Accepted: 02/19/2018] [Indexed: 12/02/2022] Open
Abstract
OBJECTIVE To investigate the effects of physical training on metabolic and morphological parameters of diabetic rats. METHODS Wistar rats were randomized into four groups: sedentary control, trained control, sedentary diabetic and trained diabetic. Diabetes mellitus was induced by Alloxan (35mg/kg) administration for sedentary diabetic and Trained Diabetic Groups. The exercise protocol consisted of swimming with a load of 2.5% of body weight for 60 minutes per day (5 days per week) for the trained control and Trained Diabetic Groups, during 6 weeks. At the end of the experiment, the rats were sacrificed and blood was collected for determinations of serum glucose, insulin, albumin and total protein. Liver samples were extracted for measurements of glycogen, protein, DNA and mitochondrial diameter determination. RESULTS The sedentary diabetic animals presented decreased body weight, blood insulin, and hepatic glycogen, as well as increased glycemia and mitochondrial diameter. The physical training protocol in diabetic animals was efficient to recovery body weight and liver glycogen, and to decrease the hepatic mitochondrial diameter. CONCLUSION Physical training ameliorated hepatic metabolism and promoted important morphologic adaptations as mitochondrial diameter in liver of the diabetic rats.
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Affiliation(s)
- Gabriel Keine Kuga
- Universidade Estadual Paulista “Júlio de Mesquita Filho”, Rio Claro, SP, Brazil
| | - Rafael Calais Gaspar
- Faculdade de Ciências Aplicadas, Universidade Estadual de Campinas, Limeira, SP, Brazil
| | - Vitor Rosetto Muñoz
- Faculdade de Ciências Aplicadas, Universidade Estadual de Campinas, Limeira, SP, Brazil
| | | | | | | | | | | | - José Rodrigo Pauli
- Faculdade de Ciências Aplicadas, Universidade Estadual de Campinas, Limeira, SP, Brazil
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Boland ML, Oldham S, Boland BB, Will S, Lapointe JM, Guionaud S, Rhodes CJ, Trevaskis JL. Nonalcoholic steatohepatitis severity is defined by a failure in compensatory antioxidant capacity in the setting of mitochondrial dysfunction. World J Gastroenterol 2018; 24:1748-1765. [PMID: 29713129 PMCID: PMC5922994 DOI: 10.3748/wjg.v24.i16.1748] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/16/2018] [Revised: 02/22/2018] [Accepted: 02/25/2018] [Indexed: 02/06/2023] Open
Abstract
AIM To comprehensively evaluate mitochondrial (dys) function in preclinical models of nonalcoholic steatohepatitis (NASH).
METHODS We utilized two readily available mouse models of nonalcoholic fatty liver disease (NAFLD) with or without progressive fibrosis: Lepob/Lepob (ob/ob) and FATZO mice on high trans-fat, high fructose and high cholesterol (AMLN) diet. Presence of NASH was assessed using immunohistochemical and pathological techniques, and gene expression profiling. Morphological features of mitochondria were assessed via transmission electron microscopy and immunofluorescence, and function was assessed by measuring oxidative capacity in primary hepatocytes, and respiratory control and proton leak in isolated mitochondria. Oxidative stress was measured by assessing activity and/or expression levels of Nrf1, Sod1, Sod2, catalase and 8-OHdG.
RESULTS When challenged with AMLN diet for 12 wk, ob/ob and FATZO mice developed steatohepatitis in the presence of obesity and hyperinsulinemia. NASH development was associated with hepatic mitochondrial abnormalities, similar to those previously observed in humans, including mitochondrial accumulation and increased proton leak. AMLN diet also resulted in increased numbers of fragmented mitochondria in both strains of mice. Despite similar mitochondrial phenotypes, we found that ob/ob mice developed more advanced hepatic fibrosis. Activity of superoxide dismutase (SOD) was increased in ob/ob AMLN mice, whereas FATZO mice displayed increased catalase activity, irrespective of diet. Furthermore, 8-OHdG, a marker of oxidative DNA damage, was significantly increased in ob/ob AMLN mice compared to FATZO AMLN mice. Therefore, antioxidant capacity reflected as the ratio of catalase:SOD activity was similar between FATZO and C57BL6J control mice, but significantly perturbed in ob/ob mice.
CONCLUSION Oxidative stress, and/or the capacity to compensate for increased oxidative stress, in the setting of mitochondrial dysfunction, is a key factor for development of hepatic injury and fibrosis in these mouse models.
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Affiliation(s)
- Michelle L Boland
- Cardiovascular and Metabolic Diseases, MedImmune LLC, Gaithersburg, MD 20878, United States
| | - Stephanie Oldham
- Cardiovascular and Metabolic Diseases, MedImmune LLC, Gaithersburg, MD 20878, United States
| | - Brandon B Boland
- Cardiovascular and Metabolic Diseases, MedImmune LLC, Gaithersburg, MD 20878, United States
| | - Sarah Will
- Cardiovascular and Metabolic Diseases, MedImmune LLC, Gaithersburg, MD 20878, United States
| | | | - Silvia Guionaud
- Pathology, Drug Safety and Metabolism, IMED Biotech Unit, AstraZeneca, Cambridge CB22 3AT, United Kingdom
| | - Christopher J Rhodes
- Cardiovascular and Metabolic Diseases, MedImmune LLC, Gaithersburg, MD 20878, United States
| | - James L Trevaskis
- Cardiovascular and Metabolic Diseases, MedImmune LLC, Gaithersburg, MD 20878, United States
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9
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Lu KL, Wang LN, Zhang DD, Liu WB, Xu WN. Berberine attenuates oxidative stress and hepatocytes apoptosis via protecting mitochondria in blunt snout bream Megalobrama amblycephala fed high-fat diets. Fish Physiol Biochem 2017; 43:65-76. [PMID: 27497985 DOI: 10.1007/s10695-016-0268-5] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2015] [Accepted: 08/01/2016] [Indexed: 06/06/2023]
Abstract
High-fat diets may have favorable effects on growth and cost, but high-fat diets often induce excessive fat deposition, resulting in liver damage. This study aimed to identify the hepatoprotective of a Chinese herb (berberine) for blunt snout bream (Megalobrama amblycephala). Fish were fed with a normal diet (LFD, 5 % fat), high-fat diet (HFD, 15 % fat) or berberine-supplemented diets (BSD, 15 % fat with berberine 50 or 100 mg/kg level) for 8 weeks. After the feeding, histology, oxidative status and mitochondrial function of liver were assessed. The results showed that HFD caused fat accumulation, oxidative stress and apoptosis in hepatocytes of fish. Hepatocytes in HFD group appeared to be hypertrophied, with larger liver cells diameter than these of LFD group. Berberine-supplemented diets could attenuate oxidative stress and hepatocytes apoptosis. HFD induced the decreasing mitochondrial complexes activities and bulk density and surface area density. Berberine improved function of mitochondrial respiratory chain via increasing the complex activities. Moreover, the histological results showed that berberine has the potential to repair mitochondrial ultrastructural damage and elevate the density in cells. In conclusion, our study demonstrated that berberine has attenuated liver damage induced by the high fat mainly via the protection for mitochondria.
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Affiliation(s)
- Kang-Le Lu
- Fisheries College, Jimei University, Xiamen, 361021, China
- College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, 210095, China
| | - Li-Na Wang
- College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, 210095, China
| | - Ding-Dong Zhang
- College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, 210095, China
| | - Wen-Bin Liu
- College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, 210095, China.
| | - Wei-Na Xu
- School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, 200240, China.
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10
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Onukwufor JO, Stevens D, Kamunde C. Combined effects of cadmium, temperature and hypoxia-reoxygenation on mitochondrial function in rainbow trout (Oncorhynchus mykiss). Aquat Toxicol 2017; 182:129-141. [PMID: 27893995 DOI: 10.1016/j.aquatox.2016.11.015] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2016] [Revised: 10/16/2016] [Accepted: 11/16/2016] [Indexed: 06/06/2023]
Abstract
Although aquatic organisms face multiple environmental stressors that may interact to alter adverse outcomes, our knowledge of stressor-stressor interaction on cellular function is limited. We investigated the combined effects of cadmium (Cd), hypoxia-reoxygenation (H-R) and temperature on mitochondrial function. Liver mitochondria from juvenile rainbow trout were exposed to Cd (0-20μM) and H-R (0 and 5min) at 5, 13 and 25°C followed by measurements of mitochondrial Cd load, volume, complex І active (A)↔deactive (D) transition, membrane potential, ROS release and ultrastructural changes. At high temperature Cd exacerbated H-R-imposed reduction of maximal complex I (CI) respiration whereas at low temperature 5 and 10μM stimulated maximal CI respiration post H-R. The basal respiration showed a biphasic response at high temperatures with low Cd concentrations reducing the stimulatory effect of H-R and high concentrations enhancing this effect. At low temperature Cd monotonically enhanced H-R-induced stimulation of basal respiration. Cd and H-R reduced both the P/O ratio and the RCR at all 3 temperatures. Temperature rise alone increased mitochondrial Cd load and toxicity, but combined H-R and temperature exposure reduced mitochondrial Cd load but surprisingly exacerbated the mitochondrial dysfunction. Mitochondrial dysfunction induced by H-R was associated with swelling of the organelle and blocking of conversion of CІ D to A form. However, low amounts of Cd protected against H-R induced swelling and prevented the inhibition of H-R-induced CI D to A transition. Both H-R and Cd dissipated mitochondrial membrane potential Δψm and damaged mitochondrial structure. We observed increased reactive oxygen species (H2O2) release that together with the protection afforded by EGTA, vitamin E and N-acetylcysteine against the Δψm dissipation suggested direct involvement of Cd and oxidative stress. Overall, our findings indicate that mitochondrial sensitivity to Cd toxicity was enhanced by the effects of H-R and temperature, and changes in mitochondrial Cd load did not always explain this effect.
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Affiliation(s)
- John O Onukwufor
- Department of Biomedical Sciences, Atlantic Veterinary College, University of Prince Edward Island, Charlottetown, PE C1A 4P3, Canada
| | - Don Stevens
- Department of Biomedical Sciences, Atlantic Veterinary College, University of Prince Edward Island, Charlottetown, PE C1A 4P3, Canada
| | - Collins Kamunde
- Department of Biomedical Sciences, Atlantic Veterinary College, University of Prince Edward Island, Charlottetown, PE C1A 4P3, Canada.
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Bermejo-Nogales A, Fernández M, Fernández-Cruz ML, Navas JM. Effects of a silver nanomaterial on cellular organelles and time course of oxidative stress in a fish cell line (PLHC-1). Comp Biochem Physiol C Toxicol Pharmacol 2016; 190:54-65. [PMID: 27544301 DOI: 10.1016/j.cbpc.2016.08.004] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/09/2016] [Revised: 07/29/2016] [Accepted: 08/12/2016] [Indexed: 12/19/2022]
Abstract
Among the nanomaterials currently in commercial products, those based on silver are the most used, and so there is a high probability that silver nanoparticles (AgNPs) will be released into aquatic environments where they could adversely affect aquatic organisms, including fish. Taking this into account, the aim of the present work was to characterize in depth the mechanisms underlying the toxic action of AgNPs using fish cell lines, determining specifically the contribution of alterations in cellular structures and oxidative stress time course to the cytotoxicity of AgNPs. Since liver plays a key role in detoxification, the hepatoma cell line PLHC-1 was used. Exposure to AgNPs (NM-300K, obtained from the Joint Research Centre Repository) caused alterations at the lysosomal and mitochondrial levels at lower concentrations than those that disrupted plasma membrane (evaluated by means of neutral red, alamarBlue, and 5-carboxyfluorescein diacetate, acetoxymethyl ester assays respectively). AgNO3, used as a control Ag+ ion source, produced similar cytotoxic effects but at lower concentrations than AgNPs. Both silver forms caused oxidative disruption but the initial response was delayed in AgNPs until 6h of exposure. Transmission electron microscopy analysis also evidenced the disruption of mitochondrial structures in cells exposed to cytotoxic concentrations of both forms of silver. At non-cytotoxic concentrations, AgNPs were detected inside the nucleoli and mitochondria, thereby pointing to long-term effects. The present work evidences the mutual interaction between the induction of oxidative stress and the alterations of cellular structures, particularly mitochondria, as cytotoxicity mechanisms not exclusively associated to NPs.
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Affiliation(s)
- A Bermejo-Nogales
- Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), Departamento de Medio Ambiente, Carretera de la Coruña, Km 7.5, Madrid, Spain.
| | - M Fernández
- Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), Avenida. Complutense 22, E-28040 Madrid, Spain
| | - M L Fernández-Cruz
- Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), Departamento de Medio Ambiente, Carretera de la Coruña, Km 7.5, Madrid, Spain
| | - J M Navas
- Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), Departamento de Medio Ambiente, Carretera de la Coruña, Km 7.5, Madrid, Spain.
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12
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Qu L, Zhang H, Yang Y, Yang G, Xin H, Ling C. Corosolic acid analogue, a natural triterpenoid saponin, induces apoptosis on human hepatocarcinoma cells through mitochondrial pathway in vitro. Pharm Biol 2016; 54:1445-1457. [PMID: 26810384 DOI: 10.3109/13880209.2015.1104699] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Context 2a,-3a,-24-Trihydroxyurs-12-en-28-oic acid (TEO, a corosolic acid analogue) is a triterpenoid saponin isolated from Actinidia valvata Dunn (Actinidiaceae), a well-known traditional Chinese medicine. Objective This study investigated the anti-proliferation and inducing apoptosis effects of TEO in three human hepatocellular carcinoma (HCC) cell lines. Materials and methods Cytotoxic activity of TEO was determined by the MTT assay at various concentrations from 2.5 to 40 μg/mL in BEL-7402, BEL-7404 and SMMC-7721 cell lines. Cell morphology was assessed by acridine orange/ethidium bromide and 4'-6-diamidino-2-phenylindole dihydrochloride staining and fluorescence microscopy. Cell-cycle distribution and DNA damage were determined by flow cytometry and comet assay. Mitochondrial dysfunction was assessed by JC-1 staining and transmission electron microscopy. Apoptosis changes were explored by Western blot, TNF-α and caspase-3, -8, -9 assays. Results TEO exhibited inhibition effects on BEL-7402, BEL-7404 and SMMC-7721 cells treated for 24 h, the IC50 values were 34.6, 30.8 and 30.5 μg/mL, respectively. TEO (40 μg/mL)-treated three cell lines increased by more than 21% in the G1 phase and presented the morphological change and DNA damage. TEO also declined the mitochondrial membrane potential and altered mitochondrial ultra-structure. Furthermore, caspase-3, caspase-8, caspase-9 and TNF-α were also activated. Mechanism investigation showed that TEO could decrease anti-apoptotic Bcl-2 protein expression, increase proapoptotic Bax and Bid proteins expressions and increase Bax/Bcl-2 ratio. Conclusion Our results demonstrate for the first time that TEO inhibited growth of HCC cell lines and induced G1 phase arrest. Moreover, proapoptotic effects of TEO were mediated through the activation of TNF-α, caspases and mitochondrial pathway.
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MESH Headings
- Actinidia/chemistry
- Antineoplastic Agents, Phytogenic/pharmacology
- Apoptosis/drug effects
- Apoptosis Regulatory Proteins/metabolism
- Carcinoma, Hepatocellular/drug therapy
- Carcinoma, Hepatocellular/metabolism
- Carcinoma, Hepatocellular/ultrastructure
- Cell Line, Tumor
- Cell Shape/drug effects
- DNA Damage
- Dose-Response Relationship, Drug
- G1 Phase Cell Cycle Checkpoints/drug effects
- Humans
- Inhibitory Concentration 50
- Liver Neoplasms/drug therapy
- Liver Neoplasms/metabolism
- Liver Neoplasms/ultrastructure
- Membrane Potential, Mitochondrial/drug effects
- Mitochondria, Liver/drug effects
- Mitochondria, Liver/metabolism
- Mitochondria, Liver/ultrastructure
- Phytotherapy
- Plant Extracts/isolation & purification
- Plant Extracts/pharmacology
- Plants, Medicinal
- Signal Transduction/drug effects
- Time Factors
- Triterpenes/isolation & purification
- Triterpenes/pharmacology
- Tumor Necrosis Factor-alpha/metabolism
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Affiliation(s)
- Liping Qu
- a Changhai Hospital of Traditional Chinese Medicine, Second Military Medical University , Shanghai , PR China
| | - Huiqing Zhang
- a Changhai Hospital of Traditional Chinese Medicine, Second Military Medical University , Shanghai , PR China
| | - Yanlong Yang
- a Changhai Hospital of Traditional Chinese Medicine, Second Military Medical University , Shanghai , PR China
| | - Geliang Yang
- a Changhai Hospital of Traditional Chinese Medicine, Second Military Medical University , Shanghai , PR China
| | - Hailiang Xin
- a Changhai Hospital of Traditional Chinese Medicine, Second Military Medical University , Shanghai , PR China
- b Department of Pharmacognosy, School of Pharmacy , Second Military Medical University , Shanghai , P.R. China
| | - Changquan Ling
- a Changhai Hospital of Traditional Chinese Medicine, Second Military Medical University , Shanghai , PR China
- c E-Institute of TCM Internal Medicine, Shanghai University of Traditional Chinese Medicine , Shanghai , P.R. China
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Dong P, Li JH, Xu SP, Wu XJ, Xiang X, Yang QQ, Jin JC, Liu Y, Jiang FL. Mitochondrial dysfunction induced by ultra-small silver nanoclusters with a distinct toxic mechanism. J Hazard Mater 2016; 308:139-148. [PMID: 26808252 DOI: 10.1016/j.jhazmat.2016.01.017] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2015] [Revised: 12/30/2015] [Accepted: 01/08/2016] [Indexed: 06/05/2023]
Abstract
As noble metal nanoclusters (NCs) are widely employed in nanotechnology, their potential threats to human and environment are relatively less understood. Herein, the biological effects of ultra-small silver NCs coated by bovine serum albumin (BSA) (Ag-BSA NCs) on isolated rat liver mitochondria were investigated by testing mitochondrial swelling, membrane permeability, ROS generation, lipid peroxidation and respiration. It was found that Ag-BSA NCs induced mitochondrial dysfunction via synergistic effects of two different ways: (1) inducing mitochondrial membrane permeability transition (MPT) by interacting with the phospholipid bilayer of the mitochondrial membrane (not with specific MPT pore proteins); (2) damaging mitochondrial respiration by the generation of reactive oxygen species (ROS). As far as we know, this is the first report on the biological effects of ultra-small size nanoparticles (∼2 nm) at the sub-cellular level, which provides significant insights into the potential risks brought by the applications of NCs. It would inspire us to evaluate the potential threats of nanomaterials more comprehensively, even though they showed no obvious toxicity to cells or in vivo animal models. Noteworthy, a distinct toxic mechanism to mitochondria caused by Ag-BSA NCs was proposed and elucidated.
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Affiliation(s)
- Ping Dong
- State Key Laboratory of Virology & Key Laboratory of Analytical Chemistry for Biology and Medicine (MOE), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, PR China
| | - Jia-Han Li
- State Key Laboratory of Virology & Key Laboratory of Analytical Chemistry for Biology and Medicine (MOE), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, PR China
| | - Shi-Ping Xu
- State Key Laboratory of Virology & Key Laboratory of Analytical Chemistry for Biology and Medicine (MOE), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, PR China
| | - Xiao-Juan Wu
- State Key Laboratory of Virology & Key Laboratory of Analytical Chemistry for Biology and Medicine (MOE), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, PR China
| | - Xun Xiang
- State Key Laboratory of Virology & Key Laboratory of Analytical Chemistry for Biology and Medicine (MOE), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, PR China
| | - Qi-Qi Yang
- State Key Laboratory of Virology & Key Laboratory of Analytical Chemistry for Biology and Medicine (MOE), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, PR China
| | - Jian-Cheng Jin
- State Key Laboratory of Virology & Key Laboratory of Analytical Chemistry for Biology and Medicine (MOE), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, PR China
| | - Yi Liu
- State Key Laboratory of Virology & Key Laboratory of Analytical Chemistry for Biology and Medicine (MOE), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, PR China
| | - Feng-Lei Jiang
- State Key Laboratory of Virology & Key Laboratory of Analytical Chemistry for Biology and Medicine (MOE), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, PR China; Hubei Key Laboratory for Processing and Application of Catalytic Materials, Huanggang Normal University, Huanggang 438000, PR China.
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14
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15
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Yang LY, Gao JL, Gao T, Dong P, Ma L, Jiang FL, Liu Y. Toxicity of polyhydroxylated fullerene to mitochondria. J Hazard Mater 2016; 301:119-126. [PMID: 26348144 DOI: 10.1016/j.jhazmat.2015.08.046] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2015] [Revised: 08/06/2015] [Accepted: 08/23/2015] [Indexed: 06/05/2023]
Abstract
Mitochondrial dysfunction is considered as a crucial mechanism of nanomaterial toxicity. Herein, we investigated the effects of polyhydroxylated fullerene (C60(OH)44, fullerenol), a model carbon-based nanomaterial with high water solubility, on isolated mitochondria. Our study demonstrated that fullerenol enhanced the permeabilization of mitochondrial inner membrane to H(+) and K(+) and induced mitochondrial permeability transition (MPT). The fullerenol-induced swelling was dose-dependent and could be effectively inhibited by MPT inhibitors such as cyclosporin A (CsA), adenosine diphosphate (ADP), ruthenium red (RR) and ethylenediaminetetraacetic acid (EDTA). After treating the mitochondria with fullerenol, the mitochondrial membrane potential (MMP) was found collapsed in a concentration-independent manner. The fluorescence anisotropy of hematoporphyrin (HP) changed significantly with the addition of fullerenol, while that of 1,6-diphenyl-hexatriene (DPH) changed slightly. Moreover, a decrease of respiration state 3 and increase of respiration state 4 were observed when mitochondria were energized with complex II substrate succinate. The results of transmission electron microscopy (TEM) provided direct evidence that fullerenol damaged the mitochondrial ultrastructure. The investigations can provide comprehensive information to elucidate the possible toxic mechanism of fullerenols at subcellular level.
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Affiliation(s)
- Li-Yun Yang
- State Key Laboratory of Virology & Key Laboratory of Analytical Chemistry for Biology and Medicine (MOE), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, PR China
| | - Jia-Ling Gao
- Department of Chemistry, College of Chemistry and Environmental Engineering, Yangtze University, Jingzhou 434023, PR China
| | - Tian Gao
- State Key Laboratory of Virology & Key Laboratory of Analytical Chemistry for Biology and Medicine (MOE), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, PR China
| | - Ping Dong
- State Key Laboratory of Virology & Key Laboratory of Analytical Chemistry for Biology and Medicine (MOE), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, PR China
| | - Long Ma
- State Key Laboratory of Virology & Key Laboratory of Analytical Chemistry for Biology and Medicine (MOE), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, PR China
| | - Feng-Lei Jiang
- State Key Laboratory of Virology & Key Laboratory of Analytical Chemistry for Biology and Medicine (MOE), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, PR China
| | - Yi Liu
- State Key Laboratory of Virology & Key Laboratory of Analytical Chemistry for Biology and Medicine (MOE), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, PR China.
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16
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Wang YC, Kong WZ, Jin QM, Chen J, Dong L. Effects of salvianolic acid B on liver mitochondria of rats with nonalcoholic steatohepatitis. World J Gastroenterol 2015; 21:10104-10112. [PMID: 26401075 PMCID: PMC4572791 DOI: 10.3748/wjg.v21.i35.10104] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/10/2015] [Revised: 04/25/2015] [Accepted: 06/16/2015] [Indexed: 02/06/2023] Open
Abstract
AIM: To investigate the effects of salvianolic acid B (Sal B) on the morphological characteristics and functions of liver mitochondria of rats with nonalcoholic steatohepatitis (NASH).
METHODS: A total of 60 male Sprague-Dawley rats were randomly divided into three groups: (1) a normal group fed a normal diet; (2) an NASH model group; and (3) a Sal B-treated group fed a high-fat diet. Two rats from each group were executed at the end of the 12th week to detect pathological changes. The rats in the Sal B-treated group were gavaged with 20 mL/kg Sal B (1 mg/mL) daily. The model group received an equal volume of distilled water as a control. At the end of the 24th weekend, the remaining rats were executed. Serum biochemical parameters and liver histological characteristics were observed. Malondialdehyde (MDA) and superoxide dismutase (SOD) in the liver were determined. Protein expression of CytC and caspase-3 was determined by immunohistochemistry. The mRNA transcripts of mitofusin-2 (Mfn2) and NF-κB in the liver tissue were detected by real-time PCR. Mitochondrial membrane potential was detected using a fluorescence spectrophotometer. Mitochondrial respiratory function was detected using a Clark oxygen electrode.
RESULTS: The model group showed significantly higher ALT, AST, TG, TC and MDA but significantly lower SOD than the normal group. In the model group, the histological characteristics of inflammation and steatosis were also evident; mitochondrial swelling and crest were shortened or even disappeared. CytC (18.46 ± 1.21 vs 60.01 ± 3.43, P < 0.01) and caspase-3 protein expression (30.26 ± 2.56 vs 83.31 ± 5.12, P < 0.01) increased significantly. The mRNA expression of NF-κB increased (0.81 ± 0.02 vs 0.91 ± 0.03, P < 0.05), whereas the mRNA expression of Mfn2 decreased (1.65 ± 0.31 vs 0.83 ± 0.16, P < 0.05). Mitochondrial membrane potential also decreased and breathing of rats was weakened. Steatosis and inflammation degrees in the treatment group were significantly alleviated compared with those of the model group. In the treatment group, mitochondrial swelling was alleviated. CytC (60.01 ± 3.43 vs 30.52 ± 2.01, P < 0.01) and caspase-3 protein expression (83.31 ± 5.12 vs 40.15 ± 3.26, P < 0.01) significantly decreased. The mRNA expression of NF-κB also decreased (0.91 ± 0.03 vs 0.74 ± 0.02, P < 0.01), whereas the mRNA expression of Mfn2 increased (0.83 ± 0.16 vs 1.35 ± 0.23, P < 0.01). Mitochondrial membrane potential increased and respiratory function was enhanced.
CONCLUSION: Sal B can treat NASH by protecting the morphological characteristics and functions of liver mitochondria, regulating lipid metabolism, controlling oxidative stress and lipid peroxidation and inhibiting apoptosis.
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Xu Z, Zhang L, Li X, Jiang Z, Sun L, Zhao G, Zhou G, Zhang H, Shang J, Wang T. Mitochondrial fusion/fission process involved in the improvement of catalpol on high glucose-induced hepatic mitochondrial dysfunction. Acta Biochim Biophys Sin (Shanghai) 2015; 47:730-40. [PMID: 26140925 DOI: 10.1093/abbs/gmv061] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2015] [Accepted: 05/04/2015] [Indexed: 12/26/2022] Open
Abstract
Catalpol, an iridoid glycoside, has been shown to exert hypoglycemic effect by rescuing mitochondrial function, but the detailed mechanism remains unclear yet. In this study, the effect and mechanism of catalpol on the hepatic mitochondria under diabetic conditions were further examined. Oral administration of catalpol significantly reduced the blood glucose, triglyceride, and cholesterol levels in high-fat diet- and streptozotocin-induced diabetic mice. Additionally, catalpol attenuated the decrease in liver mitochondrial ATP content resulting from diabetes. Furthermore, the number of mitochondria possessing a long size was increased in catalpol-treated mice. Interestingly, the catalpol-induced recovery of mitochondrial function was associated with decreased fission protein 1 and dynamin-related protein 1 expression as well as increased mitofusin 1 expression in the liver. In HepG2 cells, catalpol alleviated the decrease of ATP content and mitochondrial membrane potential, and the increase of reactive oxygen species formation induced by high glucose. MitoTracker Green stain shows that the tubular feature of mitochondria was maintained when cells were treated with catalpol. Catalpol also decreased fission protein 1 and dynamin-related protein 1 expression and increased mitofusin 1 expression in HepG2 cells. The present results suggest that catalpol can ameliorate hepatic mitochondrial dysfunction under a diabetic state, and this may be related to its regulation of mitochondrial fusion and fission events.
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Affiliation(s)
- Zhimeng Xu
- Jiangsu Center of Drug Screening, China Pharmaceutical University, 24 Tong Jia Xiang, Nanjing 210009, China
| | - Luyong Zhang
- Jiangsu Center of Drug Screening, China Pharmaceutical University, 24 Tong Jia Xiang, Nanjing 210009, China Jiangsu Center for Pharmacodynamics Research and Evaluation, China Pharmaceutical University, Nanjing 210009, China
| | - Xiaojie Li
- Jiangsu Center of Drug Screening, China Pharmaceutical University, 24 Tong Jia Xiang, Nanjing 210009, China
| | - Zhenzhou Jiang
- Jiangsu Center of Drug Screening, China Pharmaceutical University, 24 Tong Jia Xiang, Nanjing 210009, China Jiangsu Center for Pharmacodynamics Research and Evaluation, China Pharmaceutical University, Nanjing 210009, China
| | - Lixin Sun
- Jiangsu Center of Drug Screening, China Pharmaceutical University, 24 Tong Jia Xiang, Nanjing 210009, China Jiangsu Center for Pharmacodynamics Research and Evaluation, China Pharmaceutical University, Nanjing 210009, China
| | - Guolin Zhao
- Jiangsu Center of Drug Screening, China Pharmaceutical University, 24 Tong Jia Xiang, Nanjing 210009, China
| | - Guohua Zhou
- Qinghai Yangzong Pharmaceutial Co., Ltd, Xining 810003, China
| | - Heran Zhang
- Tianjin Institute of Pharmaceutical Research, Tianjin 300193, China
| | - Jing Shang
- Jiangsu Center of Drug Screening, China Pharmaceutical University, 24 Tong Jia Xiang, Nanjing 210009, China Jiangsu Center for Pharmacodynamics Research and Evaluation, China Pharmaceutical University, Nanjing 210009, China
| | - Tao Wang
- Jiangsu Center of Drug Screening, China Pharmaceutical University, 24 Tong Jia Xiang, Nanjing 210009, China Jiangsu Center for Pharmacodynamics Research and Evaluation, China Pharmaceutical University, Nanjing 210009, China
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Su R, Cao H, Pan J, Li C, Chen Y, Tang Z. The Protective Roles of Selenium on Hepatic Tissue Ultrastructure and Mitochondrial Antioxidant Capacity in Copper-Overloaded Rats. Biol Trace Elem Res 2015; 167:110-4. [PMID: 25762100 DOI: 10.1007/s12011-015-0293-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/30/2014] [Accepted: 03/02/2015] [Indexed: 11/25/2022]
Abstract
The aim of this study was to explore the effects of selenium addition on hepatic tissue ultrastructure and mitochondrial antioxidant capacity in copper-overloaded rats. Eighteen adult male Sprague-Dawley (SD) rats were randomly divided into three groups (n = 6 per group). Each group received 1 mL (intragastrically) of water (control, group I) or water containing copper chloride (CuCl2, 1 mol/L) (group II) or a mixture of CuCl2 (1 mol/L) with sodium selenite (Na2SeO3, 0.05 mol/L) (group III) once daily for 30 days. Histological examination revealed normal hepatocyte structure and no ultrastructural changes in mitochondria in controls. In contrast, group II exhibited severe ultrastructural alterations, fuzzy mitochondrial membranes, irregularly shaped and fragmented rough endoplasmic reticulum (RER), and the high melanin content; group III also exhibited larger amounts of engulfing vesicles (EV) in the cytoplasm. Compared to controls, the CuCl2 treatment lowered (P < 0.05) hepatocyte enzymatic activities and increased lipid peroxidation as indicated by an increase in malondialdehyde (MDA) levels. The effects of CuCl2 were attenuated by simultaneous administration with Na2SeO3. These results indicated that the adverse effects of copper toxicity can be partially attenuated by providing a source of selenium.
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Affiliation(s)
- Rongsheng Su
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, 510642, China
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Sharaf MS, van den Heuvel MR, Stevens D, Kamunde C. Zinc and calcium modulate mitochondrial redox state and morphofunctional integrity. Free Radic Biol Med 2015; 84:142-153. [PMID: 25841782 DOI: 10.1016/j.freeradbiomed.2015.03.017] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/22/2014] [Revised: 03/03/2015] [Accepted: 03/08/2015] [Indexed: 01/08/2023]
Abstract
Zinc and calcium have highly interwoven functions that are essential for cellular homeostasis. Here we first present a novel real-time flow cytometric technique to measure mitochondrial redox state and show it is modulated by zinc and calcium, individually and combined. We then assess the interactions of zinc and calcium on mitochondrial H2O2 production, membrane potential (ΔΨm), morphological status, oxidative phosphorylation (OXPHOS), complex I activity, and structural integrity. Whereas zinc at low doses and both cations at high doses individually and combined promoted H2O2 production, the two cations individually did not alter mitochondrial redox state. However, when combined at low and high doses the two cations synergistically suppressed and promoted, respectively, mitochondrial shift to a more oxidized state. Surprisingly, the antioxidants vitamin E and N-acetylcysteine showed pro-oxidant activity at low doses, whereas at high antioxidant doses NAC inhibited OXPHOS and dyscoupled mitochondria. Individually, zinc was more potent than calcium in inhibiting OXPHOS, whereas calcium more potently dissipated the ΔΨm and altered mitochondrial volume and ultrastructure. The two cations synergistically inhibited OXPHOS but antagonistically dissipated ΔΨm and altered mitochondrial volume and morphology. Overall, our study highlights the importance of zinc and calcium in mitochondrial redox regulation and functional integrity. Importantly, we uncovered previously unrecognized bidirectional interactions of zinc and calcium that reveal distinctive foci for modulating mitochondrial function in normal and disease states because they are potentially protective or damaging depending on conditions.
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Affiliation(s)
- Mahmoud S Sharaf
- Department of Biomedical Sciences, Atlantic Veterinary College, University of Prince Edward Island, Charlottetown, PE C1A 4P3, Canada; Faculty of Veterinary Medicine, Cairo University, Giza 12211, Egypt
| | - Michael R van den Heuvel
- Department of Biomedical Sciences, Atlantic Veterinary College, University of Prince Edward Island, Charlottetown, PE C1A 4P3, Canada; Canadian Rivers Institute, Department of Biology, University of Prince Edward Island, Charlottetown, PE C1A 4P3, Canada
| | - Don Stevens
- Department of Biomedical Sciences, Atlantic Veterinary College, University of Prince Edward Island, Charlottetown, PE C1A 4P3, Canada
| | - Collins Kamunde
- Department of Biomedical Sciences, Atlantic Veterinary College, University of Prince Edward Island, Charlottetown, PE C1A 4P3, Canada.
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Liu K, Guo MG, Lou XL, Li XY, Xu Y, Ji WD, Huang XD, Yang JH, Duan JC. Hepatocyte nuclear factor 4α induces a tendency of differentiation and activation of rat hepatic stellate cells. World J Gastroenterol 2015; 21:5856-5866. [PMID: 26019449 PMCID: PMC4438019 DOI: 10.3748/wjg.v21.i19.5856] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/18/2014] [Revised: 01/15/2015] [Accepted: 02/11/2015] [Indexed: 02/06/2023] Open
Abstract
AIM: To investigate the effect of hepatocyte nuclear factor 4α (HNF4α) on the differentiation and transformation of hepatic stellate cells (HSCs).
METHODS: By constructing the recombinant adenovirus vector expressing HNF4α and HNF4α shRNA vector, and manipulating HNF4α expression in HSC-T6 cells, we explored the influence of HNF4α and its induction capacity in the differentiation of rat HSCs into hepatocytes.
RESULTS: With increased expression of HNF4α mediated by AdHNF4α, the relative expression of Nanog was downregulated in HSC-T6 cells (98.33 ± 12.33 vs 41.33 ± 5.67, P < 0.001). Consequently, the expression of G-P-6 and PEPCK was upregulated (G-P-6: 14.34 ± 3.33 vs 42.53 ± 5.87, P < 0.01; PEPCK: 10.10 ± 4.67 vs 56.56 ± 5.25, P < 0.001), the expression of AFP and ALB was positive, and the expression of Nanog, Type I collagen, α-SMA, and TIMP-1 was significantly decreased. HNF4α also downregulated vimentin expression and enhanced E-cadherin expression. The ultrastructure of HNF4α-induced cells had more mitochondria and ribosomes compared with the parental cells. After silencing HNF4α expression, EPCK, E-cadherin, AFP, and ALB were downregulated and α-SMA and vimentin were upregulated.
CONCLUSION: HNF4α can induce a tendency of differentiation of HSCs into hepatocyte-like cells. These findings may provide an effective way for the treatment of liver diseases.
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Affiliation(s)
- H Sprecher
- Department of Medical Biochemistry, Ohio State University, Columbus
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22
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Lotowska JM, Sobaniec-Lotowska ME, Bockowska SB, Lebensztejn DM. Pediatric non-alcoholic steatohepatitis: The first report on the ultrastructure of hepatocyte mitochondria. World J Gastroenterol 2014; 20:4335-4340. [PMID: 24764670 PMCID: PMC3989968 DOI: 10.3748/wjg.v20.i15.4335] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/21/2013] [Revised: 11/09/2013] [Accepted: 01/02/2014] [Indexed: 02/06/2023] Open
Abstract
AIM: To investigate the ultrastructure of abnormal hepatocyte mitochondria, including their cellular and hepatic zonal distribution, in bioptates in pediatric non-alcoholic steatohepatitis (NASH).
METHODS: Ultrastructural investigations were conducted on biopsy liver specimens obtained from 10 children (6 boys and 4 girls) aged 2-14 years with previously clinicopathologically diagnosed NASH. The disease was diagnosed if liver biopsy revealed steatosis, inflammation, ballooned hepatocytes, Mallory hyaline, or focal necrosis, varying degrees of fibrosis in the absence of clinical, serological, or histological findings of infectious liver diseases, autoimmune hepatitis, metabolic liver diseases, or celiac disease. For ultrastructural analysis, fresh small liver blocks (1 mm3 volume) were fixed in a solution containing 2% paraformaldehyde and 2.5% glutaraldehyde in 0.1 mol/L cacodylate buffer. The specimens were postfixed in osmium tetroxide, subsequently dehydrated through a graded series of ethanols and propylene oxide, and embedded in Epon 812. The material was sectioned on a Reichert ultramicrotome to obtain semithin sections, which were stained with methylene blue in sodium borate. Ultrathin sections were contrasted with uranyl acetate and lead citrate, and examined using an Opton EM 900 transmission electron microscope.
RESULTS: Ultrastructural analysis of bioptates obtained from children with non-alcoholic steatohepatitis revealed characteristic repetitive mitochondrial abnormalities within hepatocytes; mainly mitochondrial polymorphisms such as megamitochondria, loss of mitochondrial cristae, and the presence of linear crystalline inclusions within the mitochondrial matrix of an increased electron density. The crystalline inclusions were particularly evident within megamitochondria (MMC), which seemed to be distributed randomly both within the hepatic parenchymal cell and the zones of hepatic lobule, without special variations in abundance. The inclusions appeared as bundles viewed longitudinally, or as an evenly spaced matrix in cross section, and frequently caused mitochondrial deformation. The average diameter of these linear structures was 10 nm and the average space between them 20 nm. Sometimes enlarged intramitochondrial granules were seen in their vicinity. Foamy cytoplasm of hepatocytes was found, resulting from the proliferation of smooth endoplasmic reticulum and glycogen accumulation. The perivascular space of Disse was frequently dilated, and contained transitional hepatic stellate cells, as well as mature and/or newly forming collagen fiber bundles.
CONCLUSION: Marked ultrastructural abnormalities observed in hepatocyte mitochondria, especially their polymorphism in the form of MMC and loss of mitochondrial cristae, accompanied by foamy cytoplasm, clearly indicate a major role of these organelles in the morphogenesis of pediatric NASH. Our findings seem to prove the high effectiveness of electron microscopy in the diagnosis of the disease.
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23
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Khraiwesh H, López-Domínguez JA, Fernández del Río L, Gutierrez-Casado E, López-Lluch G, Navas P, de Cabo R, Ramsey JJ, Burón MI, Villalba JM, González-Reyes JA. Mitochondrial ultrastructure and markers of dynamics in hepatocytes from aged, calorie restricted mice fed with different dietary fats. Exp Gerontol 2014; 56:77-88. [PMID: 24704714 DOI: 10.1016/j.exger.2014.03.023] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2013] [Revised: 03/15/2014] [Accepted: 03/25/2014] [Indexed: 12/31/2022]
Abstract
In this paper we analyzed changes in hepatocyte mitochondrial mass and ultrastructure as well as in mitochondrial markers of fission/fusion and biogenesis in mice subjected to 40% calorie restriction (CR) for 18 months versus ad libitum-fed controls. Animals subjected to CR were separated into three groups with different dietary fats: soybean oil (also in controls), fish oil and lard. Therefore, the effect of the dietary fat under CR was studied as well. Our results show that CR induced changes in hepatocyte and mitochondrial size, in the volume fraction occupied by mitochondria, and in the number of mitochondria per hepatocyte. Also, mean number of mitochondrial cristae and lengths were significantly higher in all CR groups compared with controls. Finally, CR had no remarkable effects on the expression levels of fission and fusion protein markers. However, considerable differences in many of these parameters were found when comparing the CR groups, supporting the idea that dietary fat plays a relevant role in the modulation of CR effects in aged mice.
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Affiliation(s)
- Husam Khraiwesh
- Departamento de Biología Celular, Fisiología e Inmunología, Universidad de Córdoba, Campus de Excelencia Internacional Agroalimentario, ceiA3, Córdoba, Spain
| | - José A López-Domínguez
- Departamento de Biología Celular, Fisiología e Inmunología, Universidad de Córdoba, Campus de Excelencia Internacional Agroalimentario, ceiA3, Córdoba, Spain; VM Molecular Biosciences, University of California, Davis, United States
| | - Lucía Fernández del Río
- Departamento de Biología Celular, Fisiología e Inmunología, Universidad de Córdoba, Campus de Excelencia Internacional Agroalimentario, ceiA3, Córdoba, Spain
| | - Elena Gutierrez-Casado
- Departamento de Biología Celular, Fisiología e Inmunología, Universidad de Córdoba, Campus de Excelencia Internacional Agroalimentario, ceiA3, Córdoba, Spain
| | - Guillermo López-Lluch
- Centro Andaluz de Biologia del Desarrollo, Universidad Pablo de Olavide-CSIC, CIBERER, Instituto de Salud Carlos III, Sevilla, Spain
| | - Plácido Navas
- Centro Andaluz de Biologia del Desarrollo, Universidad Pablo de Olavide-CSIC, CIBERER, Instituto de Salud Carlos III, Sevilla, Spain
| | - Rafael de Cabo
- Laboratory of Experimental Gerontology, National Institute of Aging, National Institutes of Health, Baltimore, MD, United States
| | - Jon J Ramsey
- VM Molecular Biosciences, University of California, Davis, United States
| | - María I Burón
- Departamento de Biología Celular, Fisiología e Inmunología, Universidad de Córdoba, Campus de Excelencia Internacional Agroalimentario, ceiA3, Córdoba, Spain
| | - José M Villalba
- Departamento de Biología Celular, Fisiología e Inmunología, Universidad de Córdoba, Campus de Excelencia Internacional Agroalimentario, ceiA3, Córdoba, Spain
| | - José A González-Reyes
- Departamento de Biología Celular, Fisiología e Inmunología, Universidad de Córdoba, Campus de Excelencia Internacional Agroalimentario, ceiA3, Córdoba, Spain.
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24
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Zhao J, Zhou ZQ, Jin JC, Yuan L, He H, Jiang FL, Yang XG, Dai J, Liu Y. Mitochondrial dysfunction induced by different concentrations of gadolinium ion. Chemosphere 2014; 100:194-199. [PMID: 24321333 DOI: 10.1016/j.chemosphere.2013.11.031] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2013] [Revised: 11/10/2013] [Accepted: 11/13/2013] [Indexed: 06/03/2023]
Abstract
Gadolinium-based compounds are the most widely used paramagnetic contrast agents in magnetic resonance imaging on the world. But the tricationic gadolinium ion (Gd(3+)) could induce cell apoptosis probably because of its effects on mitochondria. Until now, the mechanism about how Gd(3+) interacts with mitochondria is not well elucidated. In this work, mitochondrial swelling, collapsed transmembrane potential and decreased membrane fluidity were observed to be important factors for mitochondrial permeability transition pore (mtPTP) opening induced by Gd(3+). The protection effect of CsA (Cyclosporin A) could confirm high concentration of Gd(3+) (500 μM) would trigger mtPTP opening. Moreover, mitochondrial outer membrane breakdown and volume expansion observed clearly by transmission electron microscopy and the release of Cyt c (Cytochrome c) could explain the mtPTP opening from another aspect. In addition, MBM(+) (monobromobimane(+)) and DTT (dithiothreitol) could protect thiol (-SH) groups from oxidation so that the toxicity of Gd(3+) might be resulted from the chelation of -SH of membrane proteins by free Gd(3+). Gd(3+) could inhibit the initiation of mitochondrial membrane lipid peroxidation, so it might interact with anionic lipids too. These findings will highly contribute to the safe applications of Gd-based agents.
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Affiliation(s)
- Jie Zhao
- State Key Laboratory of Virology & Key Laboratory of Analytical Chemistry for Biology and Medicine (MOE), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, PR China
| | - Zhi-Qiang Zhou
- State Key Laboratory of Virology & Key Laboratory of Analytical Chemistry for Biology and Medicine (MOE), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, PR China
| | - Jian-Cheng Jin
- State Key Laboratory of Virology & Key Laboratory of Analytical Chemistry for Biology and Medicine (MOE), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, PR China
| | - Lian Yuan
- State Key Laboratory of Virology & Key Laboratory of Analytical Chemistry for Biology and Medicine (MOE), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, PR China
| | - Huan He
- State Key Laboratory of Virology & Key Laboratory of Analytical Chemistry for Biology and Medicine (MOE), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, PR China
| | - Feng-Lei Jiang
- State Key Laboratory of Virology & Key Laboratory of Analytical Chemistry for Biology and Medicine (MOE), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, PR China.
| | - Xiao-Gang Yang
- State Key Laboratory of Virology & Key Laboratory of Analytical Chemistry for Biology and Medicine (MOE), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, PR China
| | - Jie Dai
- State Key Laboratory of Virology & Key Laboratory of Analytical Chemistry for Biology and Medicine (MOE), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, PR China
| | - Yi Liu
- State Key Laboratory of Virology & Key Laboratory of Analytical Chemistry for Biology and Medicine (MOE), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, PR China
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25
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Abstract
Various types of mitochondrial dysfunctions have been implicated in a variety of human diseases. This suggests that mitochondria would be promising therapeutic drug targets and mitochondrial therapy would be expected to be useful for the treatment of various diseases. We have already reported the development of a MITO-Porter, a liposome-based nano-carrier that delivers its cargo to mitochondria via a membrane-fusion mechanism. In our strategy for delivering cargos to mitochondria using a MITO-Porter, the carriers must fuse with the organelle membrane. Here we report on methodology for screening various types of lipid envelopes that have the potential for fusing with a mitochondrial membrane. The method involves monitoring the cancellation of fluorescence resonance energy transfer (FRET) and evaluating membrane fusion between the carriers and mitochondria in living cells by FRET analysis using a spectral imaging fluorescent microscopy system.
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Affiliation(s)
- Yuma Yamada
- Laboratory for Molecular Design of Pharmaceutics, Faculty of Pharmaceutical Sciences, Hokkaido University, Sapporo, Japan
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26
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Franko A, Baris OR, Bergschneider E, von Toerne C, Hauck SM, Aichler M, Walch AK, Wurst W, Wiesner RJ, Johnston ICD, de Angelis MH. Efficient isolation of pure and functional mitochondria from mouse tissues using automated tissue disruption and enrichment with anti-TOM22 magnetic beads. PLoS One 2013; 8:e82392. [PMID: 24349272 PMCID: PMC3861405 DOI: 10.1371/journal.pone.0082392] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2013] [Accepted: 11/01/2013] [Indexed: 12/13/2022] Open
Abstract
To better understand molecular mechanisms regulating changes in metabolism, as observed e.g. in diabetes or neuronal disorders, the function of mitochondria needs to be precisely determined. The usual isolation methods such as differential centrifugation result in isolates of highly variable quality and quantity. To fulfill the need of a reproducible isolation method from solid tissues, which is suitable to handle parallel samples simultaneously, we developed a protocol based on anti-TOM22 (translocase of outer mitochondrial membrane 22 homolog) antibody-coupled magnetic beads. To measure oxygen consumption rate in isolated mitochondria from various mouse tissues, a traditional Clark electrode and the high-throughput XF Extracellular Flux Analyzer were used. Furthermore, Western blots, transmission electron microscopic and proteomic studies were performed to analyze the purity and integrity of the mitochondrial preparations. Mitochondrial fractions isolated from liver, brain and skeletal muscle by anti-TOM22 magnetic beads showed oxygen consumption capacities comparable to previously reported values and little contamination with other organelles. The purity and quality of isolated mitochondria using anti-TOM22 magnetic beads was compared to traditional differential centrifugation protocol in liver and the results indicated an obvious advantage of the magnetic beads method compared to the traditional differential centrifugation technique.
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Affiliation(s)
- Andras Franko
- Institute of Experimental Genetics, Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg, Germany
| | - Olivier R. Baris
- Institute of Vegetative Physiology, Medical Faculty, University of Köln, Köln, Germany
| | | | - Christine von Toerne
- Research Unit Protein Science, Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg, Germany
| | - Stefanie M. Hauck
- Research Unit Protein Science, Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg, Germany
| | - Michaela Aichler
- Research Unit Analytical Pathology, Institute of Pathology, Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg, Germany
| | - Axel K. Walch
- Research Unit Analytical Pathology, Institute of Pathology, Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg, Germany
| | - Wolfgang Wurst
- Institute of Developmental Genetics, Helmholtz Zentrum München, Technische Universität München, Neuherberg, Germany
- Max Planck Institute of Psychiatry, Munich, Germany
- Technische Universität München, Lehrstuhl für Entwicklungsgenetik, c/o Helmholtz Zentrum München, Neuherberg, Germany
- DZNE – Deutsches Zentrum fuer Neurodegenerative Erkrankungen, Site Munich, Germany
| | - Rudolf J. Wiesner
- Institute of Vegetative Physiology, Medical Faculty, University of Köln, Köln, Germany
- Center for Molecular Medicine (CMMC), University of Köln, Köln, Germany
- Cologne Excellence Cluster on Cellular Stress Responses in Ageing-associated Diseases (CECAD), University of Köln, Köln, Germany
| | | | - Martin Hrabĕ de Angelis
- Institute of Experimental Genetics, Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg, Germany
- Technische Universität München, WZW - Center of Life and Food Science Weihenstephan, Chair of Experimental Genetics, Freising-Weihenstephan, Germany
- German Center for Diabetes Research (DZD), Neuherberg, Germany
- * E-mail:
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27
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Zhu WJ, Li M, Liu C, Qu JP, Min YH, Xu SW, Li S. Avermectin induced liver injury in pigeon: mechanisms of apoptosis and oxidative stress. Ecotoxicol Environ Saf 2013; 98:74-81. [PMID: 24138898 DOI: 10.1016/j.ecoenv.2013.09.021] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2013] [Revised: 09/08/2013] [Accepted: 09/12/2013] [Indexed: 06/02/2023]
Abstract
Extensive use of avermectin (AVM) can result in environment pollution, and it is important to evaluate the potential impact this antibiotic has on ecological systems. Few published literatures have discussed the liver injury mechanisms induced by AVM on birds. In this study, pigeons were exposed to feed containing AVM (0, 20, 40 and 60 mg/kg diet) for 30, 60, 90 days respectively. The results showed that AVM increased the number of apoptosis and the expression level of caspase-3, 8, fas mRNA in the liver of pigeons. Ultrastructural alterations, including mitochondrial damage and chromatin aggregation, become severe with increase exposure dose. Exposure to AVM induced significant changes in antioxidant enzyme {superoxide dismutase (SOD) and glutathione peroxidase (GSH-Px)} activities and malondialdehyde (MDA) content, augmented protein carbonyl (PCO) content and DNA-protein crosslink (DPC) coefficient, in a concentration-dependent manner in the liver of pigeons. Our results show that AVM has toxic effect in pigeon liver, and the mechanism of injury caused by AVM is closely related to apoptosis and oxidative stress.
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Affiliation(s)
- Wen-Jun Zhu
- Department of Veterinary Medicine, Northeast Agricultural University, Harbin 150030, PR China
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28
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Laothong U, Pinlaor P, Boonsiri P, Pairojkul C, Priprem A, Johns NP, Charoensuk L, Intuyod K, Pinlaor S. Melatonin inhibits cholangiocarcinoma and reduces liver injury in Opisthorchis viverrini-infected and N-nitrosodimethylamine-treated hamsters. J Pineal Res 2013; 55:257-66. [PMID: 23772655 DOI: 10.1111/jpi.12068] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/21/2013] [Accepted: 05/16/2013] [Indexed: 12/22/2022]
Abstract
The human liver fluke Opisthorchis viverrini infection and N-nitrosodimethylamine (NDMA) administration induce cholangiocarcinoma (CCA) and liver injury in hamsters. Melatonin protects against liver injury and reduces the alteration of mitochondrial structure, mitochondrial membrane potential, and mitochondrial pro- and anti-apoptotic pathways in various cancer types. To investigate the chemopreventive effect of melatonin on CCA genesis and liver injury, hamsters were treated with a combination of O. viverrini infection and NDMA concurrently administered with melatonin (10 mg/kg and 50 mg/kg) for 120 days. Melatonin treatment at 50 mg/kg caused a significant reduction in liver/body weight ratios and decreased tumor volumes leading to an increase in the survival of animals. In the tumorous tissues, the high-dose melatonin reduced DNA fragmentation and mitochondrial apoptosis by inducing anti-apoptotic protein (Bcl-2) in the mitochondrial fraction and down-regulating cytochrome c, pro-apoptotic protein (Bax), and caspase-3 in tumor cytosol. Moreover, a high-dose melatonin treatment significantly increased mitochondrial antioxidant enzymes and prevented mitochondrial ultrastructure changes in the tumor. Overall, melatonin has potent chemopreventive effects in inhibiting CCA genesis and also reduces liver injury in hamster CCA, which, in part, might involve in the suppression of CCA by reducing tumor mitochondria alteration.
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Affiliation(s)
- Umawadee Laothong
- Department of Parasitology, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand
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29
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Nakamura J, Fujikawa M, Yoshida M. IF1, a natural inhibitor of mitochondrial ATP synthase, is not essential for the normal growth and breeding of mice. Biosci Rep 2013; 33:e00067. [PMID: 23889209 PMCID: PMC3775512 DOI: 10.1042/bsr20130078] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2013] [Accepted: 07/24/2013] [Indexed: 11/17/2022] Open
Abstract
IF1 is an endogenous inhibitor protein of mitochondrial ATP synthase. It is evolutionarily conserved throughout all eukaryotes and it has been proposed to play crucial roles in prevention of the wasteful reverse reaction of ATP synthase, in the metabolic shift from oxidative phosphorylation to glycolysis, in the suppression of ROS (reactive oxygen species) generation, in mitochondria morphology and in haem biosynthesis in mitochondria, which leads to anaemia. Here, we report the phenotype of a mouse strain in which IF1 gene was destroyed. Unexpectedly, individuals of this IF1-KO (knockout) mouse strain grew and bred without defect. The general behaviours, blood test results and responses to starvation of the IF1-KO mice were apparently normal. There were no abnormalities in the tissue anatomy or the autophagy. Mitochondria of the IF1-KO mice were normal in morphology, in the content of ATP synthase molecules and in ATP synthesis activity. Thus, IF1 is not an essential protein for mice despite its ubiquitous presence in eukaryotes.
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Affiliation(s)
- Junji Nakamura
- *Department of Molecular Bioscience, Kyoto Sangyo University, Kamigamo-Motoyama, Kyoto 603-8555, Japan
- †International Cooperative Research Project (ICORP) ATP-Synthesis Regulation Project, Japan Science and Technology Agency (JST), 2-3-6 Aomi, Tokyo 135-0064, Japan
| | - Makoto Fujikawa
- †International Cooperative Research Project (ICORP) ATP-Synthesis Regulation Project, Japan Science and Technology Agency (JST), 2-3-6 Aomi, Tokyo 135-0064, Japan
- ‡Department of Biochemistry, Tokyo University of Science, 2641 Yamazaki, Noda 278-8510, Japan
| | - Masasuke Yoshida
- *Department of Molecular Bioscience, Kyoto Sangyo University, Kamigamo-Motoyama, Kyoto 603-8555, Japan
- †International Cooperative Research Project (ICORP) ATP-Synthesis Regulation Project, Japan Science and Technology Agency (JST), 2-3-6 Aomi, Tokyo 135-0064, Japan
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30
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Zhou X, Kannisto K, Curbo S, von Döbeln U, Hultenby K, Isetun S, Gåfvels M, Karlsson A. Thymidine kinase 2 deficiency-induced mtDNA depletion in mouse liver leads to defect β-oxidation. PLoS One 2013; 8:e58843. [PMID: 23505564 PMCID: PMC3591375 DOI: 10.1371/journal.pone.0058843] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2012] [Accepted: 02/07/2013] [Indexed: 02/06/2023] Open
Abstract
Thymidine kinase 2 (TK2) deficiency in humans causes mitochondrial DNA (mtDNA) depletion syndrome. To study the molecular mechanisms underlying the disease and search for treatment options, we previously generated and described a TK2 deficient mouse strain (TK2−/−) that progressively loses its mtDNA. The TK2−/− mouse model displays symptoms similar to humans harboring TK2 deficient infantile fatal encephalomyopathy. Here, we have studied the TK2−/− mouse model to clarify the pathological role of progressive mtDNA depletion in liver for the severe outcome of TK2 deficiency. We observed that a gradual depletion of mtDNA in the liver of the TK2−/− mice was accompanied by increasingly hypertrophic mitochondria and accumulation of fat vesicles in the liver cells. The levels of cholesterol and nonesterified fatty acids were elevated and there was accumulation of long chain acylcarnitines in plasma of the TK2−/− mice. In mice with hepatic mtDNA levels below 20%, the blood sugar and the ketone levels dropped. These mice also exhibited reduced mitochondrial β-oxidation due to decreased transport of long chain acylcarnitines into the mitochondria. The gradual loss of mtDNA in the liver of the TK2−/− mice causes impaired mitochondrial function that leads to defect β-oxidation and, as a result, insufficient production of ketone bodies and glucose. This study provides insight into the mechanism of encephalomyopathy caused by TK2 deficiency-induced mtDNA depletion that may be used to explore novel therapeutic strategies.
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Affiliation(s)
- Xiaoshan Zhou
- Division of Clinical Microbiology F-68, Karolinska Institutet, Department of Laboratory Medicine, Karolinska University Hospital, Huddinge, Sweden
| | - Kristina Kannisto
- Division of Clinical Chemistry, C1-72, Karolinska Institutet, Department of Laboratory Medicine, Karolinska University Hospital, Huddinge, Sweden
| | - Sophie Curbo
- Division of Clinical Microbiology F-68, Karolinska Institutet, Department of Laboratory Medicine, Karolinska University Hospital, Huddinge, Sweden
- * E-mail:
| | - Ulrika von Döbeln
- Division of Metabolic Diseases, Karolinska Institutet, Department of Laboratory Medicine, Karolinska University Hospital, Huddinge, Sweden
| | - Kjell Hultenby
- Division of Clinical Research Center, Karolinska Institutet, Department of Laboratory Medicine, Karolinska University Hospital, Huddinge, Sweden
| | - Sindra Isetun
- Division of Metabolic Diseases, Karolinska Institutet, Department of Laboratory Medicine, Karolinska University Hospital, Huddinge, Sweden
| | - Mats Gåfvels
- Division of Clinical Chemistry, C1-72, Karolinska Institutet, Department of Laboratory Medicine, Karolinska University Hospital, Huddinge, Sweden
- Division of Clinical Chemistry, Department of Laboratory Medicine, Lund University, Lund, Sweden
| | - Anna Karlsson
- Division of Clinical Microbiology F-68, Karolinska Institutet, Department of Laboratory Medicine, Karolinska University Hospital, Huddinge, Sweden
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31
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Kurt YG, Cayci T, Akgul EO, Cakir E. Indicators of mitochondrial disease. SAO PAULO MED J 2013; 131:64-5. [PMID: 23538599 PMCID: PMC10852078 DOI: 10.1590/s1516-31802013000100012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/13/2012] [Revised: 01/13/2012] [Accepted: 05/02/2012] [Indexed: 11/21/2022] Open
Affiliation(s)
- Yasemin Gulcan Kurt
- MD. Assistant Professor, Department of Biochemistry, Gülhane Military Medical Academy, Ankara, Turkey.
| | - Tuncer Cayci
- MD. Assistant Professor, Department of Biochemistry, Gülhane Military Medical Academy and Medical School, Ankara, Turkey.
| | - Emin Ozgur Akgul
- MD. Associate Professor, Department of Biochemistry, Gülhane Military Medical Academy and Medical School, Ankara, Turkey.
| | - Erdinc Cakir
- MD. Associate Professor, Department of Biochemistry, Gülhane Military Medical Academy and Medical School, Ankara, Turkey.
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32
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Silva GH, Hessel G, Coelho KIR, Escanhoela CAF. Response to letter to the editor. SAO PAULO MED J 2013; 131:65. [PMID: 23653951] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 04/07/2023] Open
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33
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Naučienė Z, Zūkienė R, Degutytė-Fomins L, Mildažienė V. Mitochondrial membrane barrier function as a target of hyperthermia. Medicina (Kaunas) 2012; 48:249-255. [PMID: 22864272] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
BACKGROUND AND OBJECTIVE. Hyperthermia is a promising modality for cancer treatment that urgently requires detailed knowledge on molecular and cellular processes for the rational development of treatment protocols. The thorough study of the response of the inner membrane of heart and liver mitochondria to hyperthermia was performed in order to establish the pattern of the hyperthermia-induced changes in the membrane barrier function. MATERIAL AND METHODS. The isolated mitochondria from rat heart and liver (of both genders) were used for experiments, as well as mitochondria isolated from the perfused male rat liver. Changes in the membrane permeability were evaluated by mitochondrial respiration in state 2 or by estimation of the modular kinetics of the membrane leak. RESULTS. The inner membrane of isolated mitochondria from healthy tissues was found to be an extremely sensitive target of hyperthermia that exerted the response even in the febrile range. More severe hyperthermia compromised the inner mitochondrial membrane function; however, this response was tissue-specific and, to some extent, gender-dependent (for liver mitochondria). The data obtained by direct heating of isolated mitochondria were validated by experiments on the perfused liver. CONCLUSIONS. The obtained results imply a crucial importance of the evaluation of the tissue- and gender-specific differences while developing or improving the protocols for hyperthermic treatment or combinatory therapy.
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Affiliation(s)
- Zita Naučienė
- Department of Biochemistry and Biotechnologies, Vytautas Magnus University, Vileikos, Kaunas, Lithuania
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Su R, Wang R, Cao H, Pan J, Chen L, Li C, Shi D, Tang Z. High copper levels promotes broiler hepatocyte mitochondrial permeability transition in vivo and in vitro. Biol Trace Elem Res 2011; 144:636-46. [PMID: 21484409 DOI: 10.1007/s12011-011-9015-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/29/2010] [Accepted: 02/27/2011] [Indexed: 11/25/2022]
Abstract
This study was to examine the effects of copper on the mitochondrial non-specific pore. Three hundred sixty, one-day-old, healthy Arbor Acres (AA) broilers were fed with different concentrations (11, 110, 220, and 330 mg/kg) of copper originated from copper sulfate, tribasic copper chloride (TBCC), or copper methionine. At the indicated time point, the mitochondrial permeability transition (MPT) and copper concentration were analyzed. Results showed that under the same copper concentration, the MPT of broilers fed copper methionine was the greatest, followed by TBCC, then copper sulfate. The effects of copper on MPT were time- and dose-dependent. Furthermore, in vitro in the presence of K(+), 5 μM Cu(2+) could cause permeability transition as compared to 10 μM Cu(2+) in buffer without K(+). Taking these results together, we have shown that hepatocellular MPT may be influenced not only by source and concentration of copper or the raising period of broilers, but also by the existence of K(+).
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Affiliation(s)
- Rongsheng Su
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, 510642, China
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Lemeshko VV. Permeabilization of mitochondria and red blood cells by polycationic peptides BTM-P1 and retro-BTM-P1. Peptides 2011; 32:2010-20. [PMID: 21907745 DOI: 10.1016/j.peptides.2011.08.023] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/27/2011] [Revised: 08/27/2011] [Accepted: 08/27/2011] [Indexed: 11/16/2022]
Abstract
Mitochondrial and plasma membrane permeabilization by polycationic peptides BTM-P1 and retro-BTM-P1 were studied. BTM-P1 was more active than its retro-analog. In the sucrose medium, the capacity of BTM-P1 to permeabilize mitochondria was lower than in salt media. In contrast, retro-BTM-P1 showed the lowest activity in the KCl medium. The efficacy of both peptides to permeabilize red blood cells was higher in the sucrose medium and depended on the nature of salt in high ionic strength media. BTM-P1, but not retro-BTM-P1, induced biphasic change in light dispersion of red blood cells with artificially generated high transmembrane potential: the initial phase of fast cell shrinkage preceded the subsequent phase of cell swelling. The shrunken red blood cells demonstrated increased sensitivity to BTM-P1 that might be explained by the cell suicide mechanism via phosphatidylserine exposure at the cell surface. As a working hypothesis, we assume that some peptide topology characteristics, such as the orientation and values of the total and local electrical dipole moments, interacting with the membrane dipole potential, as well as the asymmetric distribution of polar and non-polar side chains are important factors affecting the membrane-permeabilizing activity of polycationic peptides.
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Affiliation(s)
- Victor V Lemeshko
- Escuela de Física, Facultad de Ciencias, Universidad Nacional de Colombia, Sede Medellín, Medellín, Colombia.
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Zakharchenko MV, Khunderiakova NV, Kondrashova MN. [Importance of preservation of biophysical organization of isolated mitochondria for revealing physiological regulation of their functions]. Biofizika 2011; 56:840-847. [PMID: 22117440] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
A method has been elaborated that preserves the mitochondrial-reticular network in lymphocytes in composition to the physiological one. Physiologicalby the immobilization of a blood smear on glass and its subsequent incubation in a medium closeresponses of respiration to excitation in the ition of early responses of ions. The recogn organism are well pronounced on these preparat mitochondria to pathogenic agents in the organism is a timely problem of basic and medicinal e- investigations since they play a leading role in the development of pathological states.
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Yu Q, Wang T, Zhou X, Wu J, Chen X, Liu Y, Wu D, Zhai Q. Wld(S) reduces paraquat-induced cytotoxicity via SIRT1 in non-neuronal cells by attenuating the depletion of NAD. PLoS One 2011; 6:e21770. [PMID: 21750730 PMCID: PMC3130051 DOI: 10.1371/journal.pone.0021770] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2011] [Accepted: 06/07/2011] [Indexed: 11/30/2022] Open
Abstract
WldS is a fusion protein with NAD synthesis activity, and has been reported to protect axonal and synaptic compartments of neurons from various mechanical, genetic and chemical insults. However, whether WldS can protect non-neuronal cells against toxic chemicals is largely unknown. Here we found that WldS significantly reduced the cytotoxicity of bipyridylium herbicides paraquat and diquat in mouse embryonic fibroblasts, but had no effect on the cytotoxicity induced by chromium (VI), hydrogen peroxide, etoposide, tunicamycin or brefeldin A. WldS also slowed down the death of mice induced by intraperitoneal injection of paraquat. Further studies demonstrated that WldS markedly attenuated mitochondrial injury including disruption of mitochondrial membrane potential, structural damage and decline of ATP induced by paraquat. Disruption of the NAD synthesis activity of WldS by an H112A or F116S point mutation resulted in loss of its protective function against paraquat-induced cell death. Furthermore, WldS delayed the decrease of intracellular NAD levels induced by paraquat. Similarly, treatment with NAD or its precursor nicotinamide mononucleotide attenuated paraquat-induced cytotoxicity and decline of ATP and NAD levels. In addition, we showed that SIRT1 was required for both exogenous NAD and WldS-mediated cellular protection against paraquat. These findings suggest that NAD and SIRT1 mediate the protective function of WldS against the cytotoxicity induced by paraquat, which provides new clues for the mechanisms underlying the protective function of WldS in both neuronal and non-neuronal cells, and implies that attenuation of NAD depletion may be effective to alleviate paraquat poisoning.
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MESH Headings
- Adenosine Triphosphate/metabolism
- Animals
- Blotting, Western
- Cell Survival/drug effects
- Cells, Cultured
- Embryo, Mammalian/cytology
- Fibroblasts/cytology
- Fibroblasts/drug effects
- Fibroblasts/metabolism
- Herbicides/administration & dosage
- Herbicides/toxicity
- Hydrogen Peroxide/toxicity
- Injections, Intraperitoneal
- Male
- Membrane Potential, Mitochondrial/drug effects
- Mice
- Mice, Inbred C57BL
- Mice, Knockout
- Microscopy, Electron
- Mitochondria, Liver/drug effects
- Mitochondria, Liver/physiology
- Mitochondria, Liver/ultrastructure
- Mutation
- NAD/metabolism
- NAD/pharmacology
- Nerve Tissue Proteins/genetics
- Nerve Tissue Proteins/metabolism
- Nicotinamide Mononucleotide/pharmacology
- Oxidants/toxicity
- Paraquat/administration & dosage
- Paraquat/toxicity
- Reactive Oxygen Species/metabolism
- Sirtuin 1/genetics
- Sirtuin 1/metabolism
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Affiliation(s)
- Qiujing Yu
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Graduate School of the Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Ting Wang
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Graduate School of the Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Xuexia Zhou
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Graduate School of the Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Jingxia Wu
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Graduate School of the Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Xingmiao Chen
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Graduate School of the Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Yang Liu
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Graduate School of the Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Dongmei Wu
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Graduate School of the Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Qiwei Zhai
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Graduate School of the Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, China
- * E-mail:
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Zhang Y, Jiang L, Hu W, Zheng Q, Xiang W. Mitochondrial dysfunction during in vitro hepatocyte steatosis is reversed by omega-3 fatty acid-induced up-regulation of mitofusin 2. Metabolism 2011; 60:767-75. [PMID: 20817187 DOI: 10.1016/j.metabol.2010.07.026] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/20/2010] [Revised: 06/01/2010] [Accepted: 07/14/2010] [Indexed: 12/17/2022]
Abstract
We examined the effects and mechanisms of omega-3 polyunsaturated fatty acid (PUFA) administration on mitochondrial morphology and function in an in vitro steatotic hepatocyte model created using HepG2 cells. Reverse transcriptase polymerase chain reaction and Western blot analyses were performed to determine the expression levels of mitofusin 2 (Mfn2), and immunofluorescent MitoTracker Mitochondrion-Selective Probes were used to detect changes in mitochondrial morphology. Adenosine triphosphate (ATP) synthesis and reactive oxygen species (ROS) production were measured to assess mitochondrial function. Mitofusin 2 expression was significantly suppressed (P < .05), ATP levels were decreased (P < .05), ROS production was increased (P < .05), and the normal tubular network of mitochondria was fragmented into short rods or spheres. Model cells were incubated with eicosapentaenoic acid or docosahexaenoic acid at a final concentration of 50 μmol/L for 1 hour. Both eicosapentaenoic acid and docosahexaenoic acid increased the expression of Mfn2 (P < .01) and caused an increase in the length of mitochondrial tubules. The omega-3 PUFAs also increased the levels of ATP (P < .05) and decreased the ROS production (P < .05). However, these changes were not seen in Mfn2-depleted steatotic HepG2 cells, created by RNA interference before incubation with the omega-3 PUFAs. This study demonstrated that, in steatotic hepatocytes, omega-3 PUFAs may change mitochondrial morphology and have beneficial effects on recovery of mitochondrial function by increasing the expression of Mfn2.
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MESH Headings
- Adenosine Triphosphate/metabolism
- Azo Compounds
- Blotting, Western
- Cells, Cultured
- Coloring Agents
- Fatty Acids, Omega-3/therapeutic use
- Fatty Liver/drug therapy
- Fatty Liver/pathology
- Fluorometry
- GTP Phosphohydrolases
- Hepatocytes/drug effects
- Hepatocytes/metabolism
- Hepatocytes/pathology
- Humans
- Image Processing, Computer-Assisted
- Membrane Proteins/biosynthesis
- Microscopy, Fluorescence
- Mitochondria, Liver/drug effects
- Mitochondria, Liver/pathology
- Mitochondria, Liver/ultrastructure
- Mitochondrial Proteins/biosynthesis
- RNA, Messenger/biosynthesis
- RNA, Messenger/genetics
- RNA, Small Interfering/pharmacology
- Reactive Oxygen Species/metabolism
- Reverse Transcriptase Polymerase Chain Reaction
- Up-Regulation/drug effects
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Affiliation(s)
- Yong Zhang
- Department of General Surgery, Union Hospital, Huazhong University of Science and Technology, China, 430022
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Lonardo A, Bellentani S, Ratziu V, Loria P. Insulin resistance in nonalcoholic steatohepatitis: necessary but not sufficient - death of a dogma from analysis of therapeutic studies? Expert Rev Gastroenterol Hepatol 2011; 5:279-89. [PMID: 21476922 DOI: 10.1586/egh.11.19] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Studies on pathogenesis tend to blame insulin resistance as the chief pathogenic agent in the development and progression of nonalcoholic steatohepatitis (NASH). In this article, studies reporting histological changes induced by pharmacological therapy and nonpharmacological interventions in NASH are critically reviewed, assuming that analysis of morphological findings can provide further insight into the pathogenesis of NASH. PubMed database analysis provided 16 studies describing light microscopy in adults and three in children; ultrastructural analysis was conducted through electron microscopy in two human and four animal studies. Analysis of the data disclosed methodological issues, such as variable histological criteria, limited series, failure to stratify enrolled patients for their risk of progression and very few electron microscopy studies. Moreover, no particularly convincing 'proof-of-concept' study that might assist in understanding the pathogenesis of NASH was found. It is noteworthy that insulin sensitizers fail to treat NASH in all cases, do not reverse or even worsen mitochondrial abnormalities in NASH and, conversely, histological improvement of disease, at least in some patients, is observed with agents acting through mechanisms other than insulin sensitization, such as vitamin E. The finding that correction of insulin resistance may not be sufficient to successfully treat NASH in the majority of patients seems to conflict with studies on pathogenesis. This might imply that NASH is the shared end result of varying pathogenic mechanisms concurring to determine liver damage to a variable extent in the individual patients. If this hypothesis is true, we should try to tailor treatment to each subject.
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Affiliation(s)
- Amedeo Lonardo
- Università di Modena e Reggio Emilia, Azienda USL di Modena, Modena, Italy.
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Chinopoulos C, Konràd C, Kiss G, Metelkin E, Töröcsik B, Zhang SF, Starkov AA. Modulation of F0F1-ATP synthase activity by cyclophilin D regulates matrix adenine nucleotide levels. FEBS J 2011; 278:1112-25. [PMID: 21281446 PMCID: PMC3062657 DOI: 10.1111/j.1742-4658.2011.08026.x] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Cyclophilin D was recently shown to bind to and decrease the activity of F(0)F(1)-ATP synthase in submitochondrial particles and permeabilized mitochondria [Giorgio V et al. (2009) J Biol Chem, 284, 33982-33988]. Cyclophilin D binding decreased both ATP synthesis and hydrolysis rates. In the present study, we reaffirm these findings by demonstrating that, in intact mouse liver mitochondria energized by ATP, the absence of cyclophilin D or the presence of cyclosporin A led to a decrease in the extent of uncoupler-induced depolarization. Accordingly, in substrate-energized mitochondria, an increase in F(0)F(1)-ATP synthase activity mediated by a relief of inhibition by cyclophilin D was evident in the form of slightly increased respiration rates during arsenolysis. However, the modulation of F(0)F(1)-ATP synthase by cyclophilin D did not increase the adenine nucleotide translocase (ANT)-mediated ATP efflux rate in energized mitochondria or the ATP influx rate in de-energized mitochondria. The lack of an effect of cyclophilin D on the ANT-mediated adenine nucleotide exchange rate was attributed to the ∼ 2.2-fold lower flux control coefficient of the F(0)F(1)-ATP synthase than that of ANT, as deduced from measurements of adenine nucleotide flux rates in intact mitochondria. These findings were further supported by a recent kinetic model of the mitochondrial phosphorylation system, suggesting that an ∼ 30% change in F(0)F(1)-ATP synthase activity in fully energized or fully de-energized mitochondria affects the ADP-ATP exchange rate mediated by the ANT in the range 1.38-1.7%. We conclude that, in mitochondria exhibiting intact inner membranes, the absence of cyclophilin D or the inhibition of its binding to F(0)F(1)-ATP synthase by cyclosporin A will affect only matrix adenine nucleotides levels.
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Affiliation(s)
- Christos Chinopoulos
- Weill Medical College Cornell University, New York, NY, 10021, USA
- Department of Medical Biochemistry, Semmelweis University, Budapest, 1094, Hungary
| | - Csaba Konràd
- Department of Medical Biochemistry, Semmelweis University, Budapest, 1094, Hungary
| | - Gergely Kiss
- Department of Medical Biochemistry, Semmelweis University, Budapest, 1094, Hungary
| | | | - Beata Töröcsik
- Department of Medical Biochemistry, Semmelweis University, Budapest, 1094, Hungary
| | - Steven F. Zhang
- Weill Medical College Cornell University, New York, NY, 10021, USA
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Abstract
The pathogenesis of nonalcoholic steatohepatitis (NASH) is poorly understood and the mechanisms are still being elucidated. Mitochondrial dysfunction participates at different levels in NASH pathogenesis since it impairs fatty liver homeostasis and induces overproduction of free radicals that in turn trigger lipid peroxidation and cell death. In this article, we review the role of mitochondria in fat metabolism, energy homeostasis and reactive oxygen species production, with a focus on the role of mitochondrial impairment and uncoupling proteins in the pathophysiology of NASH progression. The potential effects of some molecules targeted to mitochondria are also discussed.
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Affiliation(s)
- Gaetano Serviddio
- CURE (Centre for Liver Disease Research and Treatment), Department of Medical and Occupational Sciences, University of Foggia, 70124 Foggia, Italy.
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Skrha J, Gáll J, Buchal R, Sedláčková E, Pláteník J. Glucose and its metabolites have distinct effects on the calcium-induced mitochondrial permeability transition. Folia Biol (Praha) 2011; 57:96-103. [PMID: 21888832] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Mitochondrial production of reactive oxygen species (ROS) due to up-regulated glucose oxidation is thought to play a crucial, unifying role in the pathogenesis of chronic complications associated with diabetes mellitus. Mitochondrial permeability transition (MPT) is an interesting phenomenon involved in calcium signalling and cell death. We investigated the effects of glucose and several of its metabolites on calcium-induced MPT (measured as mitochondrial swelling) in isolated rat liver mitochondria. The presence of glucose, glucose 1-phosphate (both at 30 mM) or methylglyoxal (6 mM) significantly slowed calcium-induced mitochondrial swelling. Thirty mM glucose also resulted in a significant delay of MPT onset. In contrast, 30 mM fructose 6-phosphate accelerated swelling, whereas glucose 6-phosphate did not influence the MPT. The calcium binding potentials of the three hexose phosphates were tested and found similar. In vitro hydrogen peroxide production by mitochondria respiring on succinate in the presence of rotenone was independent of mitochondrial membrane potential and increased transiently during calcium-induced MPT. Inhibition of MPT with cyclosporine A resulted in decreased mitochondrial ROS production in response to calcium. In contrast, inhibition of MPT by methylglyoxal was accompanied by increased ROS production in response to calcium. In conclusion, we confirm that methylglyoxal is a potent inhibitor of MPT. In addition, high levels of glucose, glucose 1-phosphate and fructose 6-phosphate can also affect MPT. Methylglyoxal simultaneously inhibits MPT and increases mitochondrial ROS production in response to calcium. Our findings provide a novel context for the role of MPT in glucose sensing and the cellular toxicity caused by methylglyoxal.
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Affiliation(s)
- J Skrha
- Institute of Medical Biochemistry, First Faculty of Medicine, Charles University in Prague, Prague, Czech Republic
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Silva GH, Hessel G, Coelho KIR, Escanhoela CAF. Steatosis of indeterminate cause in a pediatric group: is it a primary mitochondrial hepatopathy? SAO PAULO MED J 2011; 129:217-23. [PMID: 21971896 PMCID: PMC10896015 DOI: 10.1590/s1516-31802011000400004] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/30/2010] [Revised: 08/30/2010] [Accepted: 03/28/2011] [Indexed: 01/07/2023] Open
Abstract
CONTEXT AND OBJECTIVE In children, hepatic steatosis may be related to inborn errors of metabolism (IEMs) or to non-alcoholic fatty liver disease (NAFLD). The aim of this study was to assess and characterize steatosis of indeterminate cause through morphological and morphometric analysis of liver tissue. DESIGN AND SETTING Cross-sectional study at the Departments of Pathology of Faculdade de Ciências Médicas, Universidade Estadual de Campinas (FCM-Unicamp) and Faculdade de Medicina de Botucatu, Universidade Estadual Paulista (FMB-Unesp). METHODS Eighteen consecutive liver biopsies obtained from 16 patients of ages ranging from 3 months to 12 years and nine months that were inserted in a database in the study period were analyzed using optical microscopy and transmission electron microscopy. Through electron microscopy, the mitochondrial density and mean mitochondrial surface area were determined in hepatocytes. Ten patients ranging in age from 1 to 14 years were used as a control group. RESULTS "Pure" steatosis was detected, unaccompanied by fibrosis or any other histological alteration. Microvesicular steatosis predominated, with a significant increase in mean mitochondrial surface area. CONCLUSION Microvesicular steatosis may be related to primary mitochondrial hepatopathy, especially due to reduction of β-oxidation or partial stagnation of oxidative phosphorylation. For these reasons, this form of steatosis (which should not be called "pure") is likely to represent an initial stage in the broad spectrum of NAFLD. We have drawn attention to cases of steatosis in the pediatric group, in which the microvesicular form predominates, since this may be associated with mitochondrial disorders.
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Affiliation(s)
- Gustavo Henrique Silva
- Department of Pediatrics, Universidade Estadual de Campinas, Campinas, São Paulo, Brazil.
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Samovski D, Kalderon B, Yehuda-Shnaidman E, Bar-Tana J. Gating of the mitochondrial permeability transition pore by long chain fatty acyl analogs in vivo. J Biol Chem 2010; 285:6879-90. [PMID: 20037159 PMCID: PMC2844138 DOI: 10.1074/jbc.m109.080416] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2009] [Revised: 12/22/2009] [Indexed: 11/06/2022] Open
Abstract
The role played by long chain fatty acids (LCFA) in promoting energy expenditure is confounded by their dual function as substrates for oxidation and as putative classic uncouplers of mitochondrial oxidative phosphorylation. LCFA analogs of the MEDICA (MEthyl-substituted DICarboxylic Acids) series are neither esterified into lipids nor beta-oxidized and may thus simulate the uncoupling activity of natural LCFA in vivo, independently of their substrate role. Treatment of rats or cell lines with MEDICA analogs results in low conductance gating of the mitochondrial permeability transition pore (PTP), with 10-40% decrease in the inner mitochondrial membrane potential. PTP gating by MEDICA analogs is accounted for by inhibition of Raf1 expression and kinase activity, resulting in suppression of the MAPK/RSK1 and the adenylate cyclase/PKA transduction pathways. Suppression of RSK1 and PKA results in a decrease in phosphorylation of their respective downstream targets, Bad(Ser-112) and Bad(Ser-155). Decrease in Bad(Ser-112, Ser-155) phosphorylation results in increased binding of Bad to mitochondrial Bcl2 with concomitant displacement of Bax, followed by PTP gating induced by free mitochondrial Bax. Low conductance PTP gating by LCFA/MEDICA may account for their thyromimetic calorigenic activity in vivo.
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Affiliation(s)
- Dmitri Samovski
- From the Department of Human Nutrition and Metabolism, Hebrew University Medical School, Jerusalem 91120, Israel
| | - Bella Kalderon
- From the Department of Human Nutrition and Metabolism, Hebrew University Medical School, Jerusalem 91120, Israel
| | - Einav Yehuda-Shnaidman
- From the Department of Human Nutrition and Metabolism, Hebrew University Medical School, Jerusalem 91120, Israel
| | - Jacob Bar-Tana
- From the Department of Human Nutrition and Metabolism, Hebrew University Medical School, Jerusalem 91120, Israel
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El-Sokkary GH, Nafady AA, Shabash EH. Melatonin administration ameliorates cadmium-induced oxidative stress and morphological changes in the liver of rat. Ecotoxicol Environ Saf 2010; 73:456-63. [PMID: 19913298 DOI: 10.1016/j.ecoenv.2009.09.014] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2009] [Revised: 06/02/2009] [Accepted: 09/13/2009] [Indexed: 05/25/2023]
Abstract
The oxidative status and the morphological changes of liver of rats exposed to cadmium (5 mg Cd/kg body weight subcutaneously) for 22 days and the protective role of melatonin (10mg/kg b.w.) against the toxicity of cadmium was studied. The concentration of malondialdehyde (MDA), as an indicator of lipid peroxidation, activity of the antioxidant enzyme superoxide dismutase (SOD) as well as the concentration of glutathione (GSH) was measured in the liver. The morphological changes were investigated using both light and electron microscopes. The exposure to Cd led to an increase of MDA levels and a decrease of both the activity of SOD and GSH concentration in the liver. In contrast, melatonin administration restored the previous changes to nearly the normal levels. Morphologically, Cd led to different histopathological changes such as loss of normal architecture of the parenchymatous tissue, cytoplasmic vacuolization, cellular degeneration and necrosis, congested blood vessels, destructed cristae mitochondria, fat globules, severe glycogen depletion, lipofuscin pigments, and collagenous fibers formation. Again, melatonin administration counteracts all changes and the tissue appears more or less normal. The rate of recovery was faster when melatonin was administered for treatment after the exposure to cadmium than if the animals left without any treatment. The results suggest that melatonin may be useful as an antioxidant in combating free radical-induced oxidative stress and tissue injury that is a result of cadmium toxicity.
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Affiliation(s)
- Gamal H El-Sokkary
- Department of Zoology, Faculty of Science, Assiut University, 71516 Assiut, Egypt.
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Corcelli A, Saponetti MS, Zaccagnino P, Lopalco P, Mastrodonato M, Liquori GE, Lorusso M. Mitochondria isolated in nearly isotonic KCl buffer: focus on cardiolipin and organelle morphology. Biochim Biophys Acta 2010; 1798:681-7. [PMID: 20093104 DOI: 10.1016/j.bbamem.2010.01.005] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2009] [Revised: 01/11/2010] [Accepted: 01/12/2010] [Indexed: 11/20/2022]
Abstract
Rat liver mitochondria were isolated in parallel in two different isolation buffers: a standard buffer containing mannitol/sucrose and a nearly physiological KCl based solution. The two different organelle preparations were comparatively characterized by respiratory activity, heme content, microsomal and Golgi contamination, electron microscopy and lipid analyses. The substitution of saccharides with KCl in the isolation buffer does not induce the formation of mitoplasts or disruption of mitochondria. Mitochondria isolated in KCl buffer are coupled and able to maintain a stable transmembrane charge separation. A number of biochemical and functional differences between the two organelle preparations are described; in particular KCl mitochondria exhibit lower cardiolipin content and smaller intracristal compartments in comparison with the standard mitochondrial preparation.
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Affiliation(s)
- Angela Corcelli
- Department of Medical Biochemistry, Biology and Physics, University of Bari, Bari, Italy.
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Ardail D, Debon A, Perret-Vivancos C, Biol-N'Garagba MC, Krantic S, Lobie PE, Morel G. Growth hormone internalization in mitochondria decreases respiratory chain activity. Neuroendocrinology 2010; 91:16-26. [PMID: 20016135 DOI: 10.1159/000268289] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/24/2008] [Accepted: 05/13/2009] [Indexed: 11/19/2022]
Abstract
Growth hormone (GH) is a signaling molecule regulating cell proliferation, differentiation and metabolism via activation of specific cell surface receptors and subsequent triggering of signal transduction pathways. This is associated with GH/GH receptor internalization and accumulation of GH in several subcellular compartments, including mitochondria. To assess the functional relevance of such mitochondrial accumulation, we first confirmed the occurrence of mitochondrial GH uptake ex vivo as early as 10 min after (125)I-GH injection to the rats. We next showed that intact (125)I-GH accumulates in mitochondrial fractions in vitro in a specific, rapid and saturable manner with an apparent affinity (K(d)) of 1.44 nM. At the electron-microscopic level, immunoreactive GH density within mitochondria increased after in vitro hormone incubation, without any modification of the sub-mitochondrial distribution pattern. The presence of GH in the inter-membrane space and at the inner membrane seen by electron microscopy was confirmed by SDS-PAGE and autoradiography after mitochondrial fractioning thus suggesting the involvement of GH in the respiration control. To test this hypothesis further, we performed polarographic and spectrophotometric assays on isolated mitochondria. These assays pointed to a direct, selective and dose-dependent effect of GH on the inhibition of succinate dehydrogenase and cytochrome C oxidase activities. The latter inhibition was in contrast with indirect, GH receptor-initiated stimulation of cytochrome C oxidase activity observed in GH-treated whole BRL cells transfected to express this receptor. Altogether, these data show that GH is specifically imported in mitochondria, where it operates a direct metabolic effect, independently of cell surface receptors and signal transduction.
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Affiliation(s)
- Dominique Ardail
- IFR 41, CNRS UMR 5123, Physiologie Intégrative Cellulaire et Moléculaire, Université de Lyon, Villeurbanne, France
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Michurina SV, Borodin II, Trufakin VA, Belkin AD, Vakulin GM, Larionov PM, Shurlygina AV. [Micro- and ultrastructural characteristics of liver and nuclear endonuclease activity in hepatocytes after the combined exposure to industrial frequency magnetic field and continuous illumination]. Morfologiia 2010; 137:47-51. [PMID: 21500433] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The effects of combined action of the industrial frequency magnetic field (MF) and continuous illumination (CI) on microcirculation, ultrastructural features of liver cells and apoptosis were studied in Wistar rats (n=56). It was found that in the liver of rats exposed to MF, CI and CI+MF for 14 days, parenchyma relative area was reduced, and that occupied by the sinusoidal capillaries was increased together with the liver vascularization coefficient. Combined exposure resulted in most pronounced ultrastructural changes (plasma membrane lysis in hepatocytes and endothelial cells, doubling of osmiophilic layers in tight intercellular junctions). Hepatocytes revealed condensed cytoplasm, mitochondria with electron-dense matrix, nuclear chromatin disintegration and nucleolar compaction. Hepatocyte intranuclear endonucleases were activated.
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Sun K, Liu ZS, Sun Q. [Protective effect of ischemic postconditioning on hepatic ischemia-reperfusion injury]. Nan Fang Yi Ke Da Xue Xue Bao 2009; 29:2480-2484. [PMID: 20034907] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
OBJECTIVE To investigate the protective effect of ischemic postconditioning (IPC) against hepatic ischemia-reperfusion injury. METHODS Twenty-four normal male Wistar rats were randomly divided into sham-operated group, ischemia-reperfusion group (IR) and IPC group, and in the latter two groups, the rats were subjected to acute hepatic ischemia-reperfusion. IPC was achieved by several brief pre-reperfusion and withdrawn before persistent reperfusion. The concentration of malondialdehyde (MDA) and activity of several antioxidant enzymes in the hepatic tissue were measured. The cell apoptosis was detected by TdT-mediated dUTP-biotin nick end labeling (TUNEL) and the expression of Bcl-2 protein measured by immunohistochemistry. The mitochondrial ultrastructural and morphological changes of the hepatic cells were observed by electron microscopy. RESULTS Compared with IR group, IPC group showed significantly reduced concentration of MDA and the hepatocellular apoptotic index (P<0.05) with markedly enhanced activity of the antioxidant enzymes and Bcl-2 protein expression (P<0.05).The mitochondrial ultrastructural damage was also relieved obviously in IPC group. CONCLUSION IPC can reduce the hepatocellular apoptosis after reperfusion and offers protection against hepatic IR injury.
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Affiliation(s)
- Kai Sun
- Department of General Surgery, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China.
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