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Alizadeh J, Kavoosi M, Singh N, Lorzadeh S, Ravandi A, Kidane B, Ahmed N, Mraiche F, Mowat MR, Ghavami S. Regulation of Autophagy via Carbohydrate and Lipid Metabolism in Cancer. Cancers (Basel) 2023; 15:cancers15082195. [PMID: 37190124 DOI: 10.3390/cancers15082195] [Citation(s) in RCA: 14] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2023] [Revised: 03/21/2023] [Accepted: 03/28/2023] [Indexed: 05/17/2023] Open
Abstract
Metabolic changes are an important component of tumor cell progression. Tumor cells adapt to environmental stresses via changes to carbohydrate and lipid metabolism. Autophagy, a physiological process in mammalian cells that digests damaged organelles and misfolded proteins via lysosomal degradation, is closely associated with metabolism in mammalian cells, acting as a meter of cellular ATP levels. In this review, we discuss the changes in glycolytic and lipid biosynthetic pathways in mammalian cells and their impact on carcinogenesis via the autophagy pathway. In addition, we discuss the impact of these metabolic pathways on autophagy in lung cancer.
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Affiliation(s)
- Javad Alizadeh
- Department of Human Anatomy and Cell Science, College of Medicine, University of Manitoba, Winnipeg, MB R3E 0V9, Canada
| | - Mahboubeh Kavoosi
- Department of Human Anatomy and Cell Science, College of Medicine, University of Manitoba, Winnipeg, MB R3E 0V9, Canada
| | - Navjit Singh
- Department of Human Anatomy and Cell Science, College of Medicine, University of Manitoba, Winnipeg, MB R3E 0V9, Canada
| | - Shahrokh Lorzadeh
- Department of Human Anatomy and Cell Science, College of Medicine, University of Manitoba, Winnipeg, MB R3E 0V9, Canada
| | - Amir Ravandi
- Department of Physiology and Pathophysiology, Rady Faculty of Health Sciences, Institute of Cardiovascular Sciences, Albrechtsen Research Centre, St. Boniface Hospital, Winnipeg, MB R2H 2A6, Canada
| | - Biniam Kidane
- Section of Thoracic Surgery, Department of Surgery, Health Sciences Centre, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, MB R3T 6C5, Canada
- CancerCare Manitoba Research Institute, Winnipeg, MB R3E 0V9, Canada
| | - Naseer Ahmed
- CancerCare Manitoba Research Institute, Winnipeg, MB R3E 0V9, Canada
- Department of Radiology, Section of Radiation Oncology, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, MB R3T 2N2, Canada
| | - Fatima Mraiche
- College of Pharmacy, QU Health, Qatar University, Doha 2713, Qatar
- Department of Pharmacology, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, AB T6G 2H7, Canada
| | - Michael R Mowat
- CancerCare Manitoba Research Institute, Winnipeg, MB R3E 0V9, Canada
- Department of Biochemistry & Medical Genetics, University of Manitoba, Winnipeg, MB R3E 0J9, Canada
| | - Saeid Ghavami
- Department of Human Anatomy and Cell Science, College of Medicine, University of Manitoba, Winnipeg, MB R3E 0V9, Canada
- Research Institute of Oncology and Hematology, Winnipeg, MB R3E 0V9, Canada
- Faculty of Medicine in Zabrze, Academia of Silesia, 41-800 Zabrze, Poland
- Biology of Breathing Theme, Children Hospital Research Institute of Manitoba, University of Manitoba, Winnipeg, MB R3E 3P5, Canada
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Varela-López A, Vera-Ramírez L, Giampieri F, Navarro-Hortal MD, Forbes-Hernández TY, Battino M, Quiles JL. The central role of mitochondria in the relationship between dietary lipids and cancer progression. Semin Cancer Biol 2021; 73:86-100. [DOI: 10.1016/j.semcancer.2021.01.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2020] [Revised: 12/31/2020] [Accepted: 01/01/2021] [Indexed: 12/20/2022]
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EM-2 inhibited autophagy and promoted G 2/M phase arrest and apoptosis by activating the JNK pathway in hepatocellular carcinoma cells. Acta Pharmacol Sin 2021; 42:1139-1149. [PMID: 33318625 DOI: 10.1038/s41401-020-00564-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2020] [Accepted: 10/25/2020] [Indexed: 01/10/2023] Open
Abstract
This study aimed to investigate the inhibitory effect of EM-2, a natural active monomer purified from Elephantopusmollis H.B.K., on the proliferation of human hepatocellular carcinoma cells and the molecular mechanism involved. The results from the MTT assay revealed that EM-2 significantly inhibited the proliferation of human hepatocellular carcinoma (HCC) cells in a dose-dependent manner but exhibited less cytotoxicity to the normal liver epithelial cell line LO2. EdU staining and colony formation assays further confirmed the inhibitory effect of EM-2 on the proliferation of Huh-7 hepatocellular carcinoma cells. According to the RNA sequencing and KEGG enrichment analysis results, EM-2 markedly activated the MAPK pathway in Huh-7 cells, and the results of Western blotting further indicated that EM-2 could activate the ERK and JNK pathways. Meanwhile, EM-2 induced apoptosis in a dose-dependent manner and G2/M phase arrest in Huh-7 cells, which could be partially reversed when treated with SP600125, a JNK inhibitor. Further study indicated that EM-2 induced endoplasmic reticulum stress and blocked autophagic flux in Huh-7 cells by inhibiting autophagy-induced lysosome maturation. Inhibition of autophagy by bafilomycin A1 could reduce cell viability and increase the sensitivity of Huh-7 cells to EM-2. In conclusion, our findings revealed that EM-2 not only promoted G2/M phase arrest and activated ER stress but also induced apoptosis by activating the JNK pathway and blocked autophagic flux by inhibiting autolysosome maturation in Huh-7 hepatocellular carcinoma cells. Therefore, EM-2 is a potential therapeutic drug with promising antitumor effects against hepatocellular carcinoma and fewer side effects.
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Chen Y, Yu T. Involvement of p53 in the Responses of Cardiac Muscle Cells to Heat Shock Exposure and Heat Acclimation. J Cardiovasc Transl Res 2020; 13:928-937. [PMID: 32314164 DOI: 10.1007/s12265-020-10003-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/10/2019] [Accepted: 04/07/2020] [Indexed: 11/28/2022]
Abstract
Intense heat stress induces damage to the heart, whereas mild to moderate heat stress protects the heart against subsequent ischemic injury. The mechanisms underlying the detrimental and beneficial effects of heat stress remain unclear. In this study, we investigated the role of p53 in the responses of cardiac muscle cells to acute heat exposure and heat acclimation (HA). Heat exposure increased the levels of caspase and annexin, and levels of cytosolic, nuclear, and mitochondrial p53 protein in H9c2 cells. Pifithrin-α or pifithrin-μ reduced heat-induced apoptotic response in these cells. HA reduced localization of p53 in the mitochondria and improved cell viability during heat exposure. The effects of heat exposure and HA on p53 were further verified in vivo in mouse heart tissue. These results suggest that p53 plays a role in heat-induced apoptosis in cardiac muscle cells. The protective effect of HA against heat injury likely involves a p53-dependent mechanism.
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Affiliation(s)
- Yifan Chen
- Department of Military and Emergency Medicine, Uniformed Services University, 4301 Jones Bridge Road, Bethesda, MD, 20814, USA.
| | - Tianzheng Yu
- Department of Military and Emergency Medicine, Uniformed Services University, 4301 Jones Bridge Road, Bethesda, MD, 20814, USA
- Henry M. Jackson Foundation for the Advancement of Military Medicine, Bethesda, MD, USA
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Zhang L, Sun Y, Xu W, Geng Y, Su Y, Wang Q, Wang J. Baicalin inhibits Salmonella typhimurium-induced inflammation and mediates autophagy through TLR4/MAPK/NF-κB signalling pathway. Basic Clin Pharmacol Toxicol 2020; 128:241-255. [PMID: 32955161 DOI: 10.1111/bcpt.13497] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2020] [Revised: 08/23/2020] [Accepted: 09/13/2020] [Indexed: 01/08/2023]
Abstract
Baicalin has been reported to protect mice against Salmonella typhimurium (S. typhimurium) infection, while its molecular mechanisms are unclear. In this study, multiplicity of infection (MOI) and observation time were measured. Cell viability and LDH levels were examined in RAW264.7 cells and H9 cells. RAW264.7 cells were stimulated with S typhimurium in the presence or absence of Baicalin, and the levels of pro-inflammatory cytokines were detected by enzyme-linked immunosorbent assay (ELISA). The changes in reactive oxygen species (ROS) production were determined by fluorescence microscopy and ELISA. The autophagy and TLR4/MAPK/NF-κB signalling pathway were examined by immunofluorescence microscopy, quantitative reverse transcription-polymerase chain reaction and Western blotting. The results indicated that MOI of 30 and duration of autophagy evident at 5 h were applicable to this study. Baicalin prevented death of macrophages, promoted bactericidal activity, decreased the levels of pro-inflammatory cytokines and ROS and reduced the changes of key biomarkers in autophagy and TLR4/MAPK/NF-κB signalling pathway infected by S typhimurium. TLR4-overexpressed cells, autophagy and TLR4/MAPK/NF-κB signalling pathway were activated by S typhimurium, which was suppressed by Baicalin. Our findings indicated that Baicalin exerts anti-inflammatory and cell-protective effects, and it mediates autophagy by down-regulating the activity of TLR4 infected by S typhimurium.
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Affiliation(s)
- Ling Zhang
- School of Basic Medical Sciences, Jinzhou Medical University, Jinzhou, China
| | - Yuan Sun
- First Affiliated Hospital, Jinzhou Medical University, Jinzhou, China
| | - Wei Xu
- First Affiliated Hospital, Jinzhou Medical University, Jinzhou, China
| | - Yu Geng
- Healthcare Management School, Jinzhou Medical University, Jinzhou, China
| | - Yuhong Su
- Institute of Animal Husbandry and Veterinary Medicine, Jinzhou Medical University, Jinzhou, China
| | - Qiuning Wang
- School of Basic Medical Sciences, Jinzhou Medical University, Jinzhou, China
| | - Jinli Wang
- Institute of Animal Husbandry and Veterinary Medicine, Jinzhou Medical University, Jinzhou, China
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Mao X, Li X, Hu W, Hao S, Yuan Y, Guan L, Guo B. Downregulated brain and muscle aryl hydrocarbon receptor nuclear translocator-like protein-1 inhibits osteogenesis of BMSCs through p53 in type 2 diabetes mellitus. Biol Open 2020; 9:bio051482. [PMID: 32554484 PMCID: PMC7358138 DOI: 10.1242/bio.051482] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2020] [Accepted: 05/27/2020] [Indexed: 12/05/2022] Open
Abstract
The bone marrow mesenchymal stem cells (BMSCs)-mediated abnormal bone metabolism can delay and impair the bone remodeling process in type 2 diabetes mellitus (T2DM). Our previous study demonstrated that the downregulation of brain and muscle aryl hydrocarbon receptor nuclear translocator-like protein 1 (BMAL1), a circadian clock protein, inhibited the Wnt/β-catenin pathway via enhanced GSK-3β in diabetic BMSCs. In this article, we confirmed that the downregulated BMAL1 in T2DM played an inhibitory role in osteogenic differentiation of BMSCs. Upregulation of BMAL1 in the diabetic BMSCs significantly recovered the expression pattern of osteogenic marker genes and alkaline phosphatase (Alp) activity. We also observed an activation of the p53 signaling pathways, exhibited by increased p53 and p21 in diabetic BMSCs. Downregulation of p53 resulting from overexpression of BMAL1 was detected, and when we applied p53 gene silencing (shRNA) and the p53 inhibitor, pifithrin-α (PFT-α), the impaired osteogenic differentiation ability of diabetic BMSCs was greatly restored. However, there was no change in the level of expression of BMAL1. Taken together, our results first revealed that BMAL1 regulated osteogenesis of BMSCs through p53 in T2DM, providing a novel direction for further exploration of the mechanism underlying osteoporosis in diabetes.
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Affiliation(s)
- Xiaofei Mao
- Department of Stomatology, Chinese PLA General Hospital, Beijing 100853, China
| | - Xiaoguang Li
- Department of Stomatology, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, Shandong 250021, China
| | - Wei Hu
- Department of Stomatology, Chinese PLA General Hospital, Beijing 100853, China
| | - Siwei Hao
- Department of Stomatology, Chinese PLA General Hospital, Beijing 100853, China
| | - Yifang Yuan
- Department of Stomatology, Chinese PLA General Hospital, Beijing 100853, China
| | - Lian Guan
- Department of Stomatology, Chinese PLA General Hospital, Beijing 100853, China
| | - Bin Guo
- Department of Stomatology, Chinese PLA General Hospital, Beijing 100853, China
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Zhu J, Singh M, Selivanova G, Peuget S. Pifithrin-α alters p53 post-translational modifications pattern and differentially inhibits p53 target genes. Sci Rep 2020; 10:1049. [PMID: 31974452 PMCID: PMC6978515 DOI: 10.1038/s41598-020-58051-1] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2019] [Accepted: 01/06/2020] [Indexed: 11/19/2022] Open
Abstract
Pifithrin-α (PFT-α) is a small molecule which has been widely used as a specific inhibitor of p53 transcription activity. However, its molecular mechanism of action remains unclear. PFT-α has also been described to display potent p53-independent activity in cells. In this study, we addressed the mechanism of action of PFT-α. We found that PFT-α failed to prevent the effects of Mdm2 inhibitor Nutlin-3 on cell cycle and apoptosis in several cancer cell lines. However, PFT-α rescued normal primary fibroblasts from growth inhibition by Nutlin-3. PFT-α displayed a very limited effect on p53-dependent transcription upon its activation by Nutlin-3. Moreover, PFT-α inhibitory effect on transcription was highly dependent on the nature of the p53 target gene. PFT-α attenuated post-translational modifications of p53 without affecting total p53 protein level. Finally, we found that PFT-α can decrease the level of intracellular reactive oxygen species through activation of an aryl hydrocarbon receptor (AHR)-Nrf2 axis in a p53-independent manner. In conclusion, PFT-α inhibits only some aspects of p53 function, therefore it should be used with extreme caution to study p53-dependent processes.
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Affiliation(s)
- Jiawei Zhu
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden
| | - Madhurendra Singh
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden
| | - Galina Selivanova
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden.
| | - Sylvain Peuget
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden.
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Gao L, Wang LY, Liu ZQ, Jiang D, Wu SY, Guo YQ, Tao HM, Sun M, You LN, Qin S, Cheng XC, Xie JS, Chang GL, Zhang DY. TNAP inhibition attenuates cardiac fibrosis induced by myocardial infarction through deactivating TGF-β1/Smads and activating P53 signaling pathways. Cell Death Dis 2020; 11:44. [PMID: 31969558 PMCID: PMC6976710 DOI: 10.1038/s41419-020-2243-4] [Citation(s) in RCA: 44] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Revised: 12/30/2019] [Accepted: 01/08/2020] [Indexed: 02/07/2023]
Abstract
Tissue nonspecific alkaline phosphatase (TNAP) is expressed widely in different tissues, modulating functions of metabolism and inflammation. However, the effect of TNAP on cardiac fibrosis remains controversial and needs to be further studied. The present study aims to investigate the role of TNAP on myocardial infarction (MI)-induced fibrosis and its mechanism. TNAP was upregulated in patients with MI, both in serum and injured hearts, and predicted in-hospital mortality. TNAP was also significantly upregulated after MI in rats, mostly in the border zone of the infarcted hearts combined with collagen synthesis. Administration of TNAP inhibitor, tetramisole, markedly improved cardiac function and fibrosis after MI. In the primary cultures of neonatal rat cardiac fibroblasts (CFs), TNAP inhibition significantly attenuated migration, differentiation, and expression of collagen-related genes. The TGF-β1/Smads signaling suppression, and p-AMPK and p53 upregulation were involved in the process. When p53 inhibitor was administered, the antifibrotic effect of TNAP inhibition can be blocked. This study provides a direct evidence that inhibition of TNAP might be a novel regulator in cardiac fibrosis and exert an antifibrotic effect mainly through AMPK-TGF-β1/Smads and p53 signals.
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Affiliation(s)
- Lei Gao
- Department of Cardiovascular Medicine, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China
| | - Li-You Wang
- Department of Cardiovascular Medicine, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China
| | - Zhi-Qiang Liu
- Department of Cardiovascular Medicine, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China
| | - Dan Jiang
- Department of Cardiovascular Medicine, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China
| | - Shi-Yong Wu
- Department of Cardiovascular Medicine, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China
| | - Yu-Qian Guo
- Department of Cardiovascular Medicine, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China
| | - Hong-Mei Tao
- Department of Cardiovascular Medicine, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China
| | - Min Sun
- Department of Cardiovascular Medicine, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China
| | - Lin-Na You
- Department of Cardiovascular Medicine, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China
| | - Shu Qin
- Department of Cardiovascular Medicine, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China
| | - Xiao-Cheng Cheng
- Department of Cardiovascular Medicine, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China
| | - Jun-Shi Xie
- Department of Cardiovascular Medicine, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China
| | - Guang-Lei Chang
- Department of Cardiovascular Medicine, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China.
| | - Dong-Ying Zhang
- Department of Cardiovascular Medicine, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China.
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The mRNA-binding Protein TTP/ZFP36 in Hepatocarcinogenesis and Hepatocellular Carcinoma. Cancers (Basel) 2019; 11:cancers11111754. [PMID: 31717307 PMCID: PMC6896064 DOI: 10.3390/cancers11111754] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2019] [Revised: 11/04/2019] [Accepted: 11/05/2019] [Indexed: 02/07/2023] Open
Abstract
Hepatic lipid deposition and inflammation represent risk factors for hepatocellular carcinoma (HCC). The mRNA-binding protein tristetraprolin (TTP, gene name ZFP36) has been suggested as a tumor suppressor in several malignancies, but it increases insulin resistance. The aim of this study was to elucidate the role of TTP in hepatocarcinogenesis and HCC progression. Employing liver-specific TTP-knockout (lsTtp-KO) mice in the diethylnitrosamine (DEN) hepatocarcinogenesis model, we observed a significantly reduced tumor burden compared to wild-type animals. Upon short-term DEN treatment, modelling early inflammatory processes in hepatocarcinogenesis, lsTtp-KO mice exhibited a reduced monocyte/macrophage ratio as compared to wild-type mice. While short-term DEN strongly induced an abundance of saturated and poly-unsaturated hepatic fatty acids, lsTtp-KO mice did not show these changes. These findings suggested anti-carcinogenic actions of TTP deletion due to effects on inflammation and metabolism. Interestingly, though, investigating effects of TTP on different hallmarks of cancer suggested tumor-suppressing actions: TTP inhibited proliferation, attenuated migration, and slightly increased chemosensitivity. In line with a tumor-suppressing activity, we observed a reduced expression of several oncogenes in TTP-overexpressing cells. Accordingly, ZFP36 expression was downregulated in tumor tissues in three large human data sets. Taken together, this study suggests that hepatocytic TTP promotes hepatocarcinogenesis, while it shows tumor-suppressive actions during hepatic tumor progression.
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p53 Functions in Adipose Tissue Metabolism and Homeostasis. Int J Mol Sci 2018; 19:ijms19092622. [PMID: 30181511 PMCID: PMC6165290 DOI: 10.3390/ijms19092622] [Citation(s) in RCA: 63] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2018] [Revised: 08/24/2018] [Accepted: 08/30/2018] [Indexed: 12/25/2022] Open
Abstract
As a tumor suppressor and the most frequently mutated gene in cancer, p53 is among the best-described molecules in medical research. As cancer is in most cases an age-related disease, it seems paradoxical that p53 is so strongly conserved from early multicellular organisms to humans. A function not directly related to tumor suppression, such as the regulation of metabolism in nontransformed cells, could explain this selective pressure. While this role of p53 in cellular metabolism is gradually emerging, it is imperative to dissect the tissue- and cell-specific actions of p53 and its downstream signaling pathways. In this review, we focus on studies reporting p53’s impact on adipocyte development, function, and maintenance, as well as the causes and consequences of altered p53 levels in white and brown adipose tissue (AT) with respect to systemic energy homeostasis. While whole body p53 knockout mice gain less weight and fat mass under a high-fat diet owing to increased energy expenditure, modifying p53 expression specifically in adipocytes yields more refined insights: (1) p53 is a negative regulator of in vitro adipogenesis; (2) p53 levels in white AT are increased in diet-induced and genetic obesity mouse models and in obese humans; (3) functionally, elevated p53 in white AT increases senescence and chronic inflammation, aggravating systemic insulin resistance; (4) p53 is not required for normal development of brown AT; and (5) when p53 is activated in brown AT in mice fed a high-fat diet, it increases brown AT temperature and brown AT marker gene expression, thereby contributing to reduced fat mass accumulation. In addition, p53 is increasingly being recognized as crucial player in nutrient sensing pathways. Hence, despite existence of contradictory findings and a varying density of evidence, several functions of p53 in adipocytes and ATs have been emerging, positioning p53 as an essential regulatory hub in ATs. Future studies need to make use of more sophisticated in vivo model systems and should identify an AT-specific set of p53 target genes and downstream pathways upon different (nutrient) challenges to identify novel therapeutic targets to curb metabolic diseases.
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Krstic J, Galhuber M, Schulz TJ, Schupp M, Prokesch A. p53 as a Dichotomous Regulator of Liver Disease: The Dose Makes the Medicine. Int J Mol Sci 2018; 19:E921. [PMID: 29558460 PMCID: PMC5877782 DOI: 10.3390/ijms19030921] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2018] [Revised: 03/16/2018] [Accepted: 03/17/2018] [Indexed: 02/07/2023] Open
Abstract
Lifestyle-related disorders, such as the metabolic syndrome, have become a primary risk factor for the development of liver pathologies that can progress from hepatic steatosis, hepatic insulin resistance, steatohepatitis, fibrosis and cirrhosis, to the most severe condition of hepatocellular carcinoma (HCC). While the prevalence of liver pathologies is steadily increasing in modern societies, there are currently no approved drugs other than chemotherapeutic intervention in late stage HCC. Hence, there is a pressing need to identify and investigate causative molecular pathways that can yield new therapeutic avenues. The transcription factor p53 is well established as a tumor suppressor and has recently been described as a central metabolic player both in physiological and pathological settings. Given that liver is a dynamic tissue with direct exposition to ingested nutrients, hepatic p53, by integrating cellular stress response, metabolism and cell cycle regulation, has emerged as an important regulator of liver homeostasis and dysfunction. The underlying evidence is reviewed herein, with a focus on clinical data and animal studies that highlight a direct influence of p53 activity on different stages of liver diseases. Based on current literature showing that activation of p53 signaling can either attenuate or fuel liver disease, we herein discuss the hypothesis that, while hyper-activation or loss of function can cause disease, moderate induction of hepatic p53 within physiological margins could be beneficial in the prevention and treatment of liver pathologies. Hence, stimuli that lead to a moderate and temporary p53 activation could present new therapeutic approaches through several entry points in the cascade from hepatic steatosis to HCC.
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Affiliation(s)
- Jelena Krstic
- Gottfried Schatz Research Center for Cell Signaling, Metabolism & Aging, Medical University of Graz, 8010 Graz, Austria.
| | - Markus Galhuber
- Gottfried Schatz Research Center for Cell Signaling, Metabolism & Aging, Medical University of Graz, 8010 Graz, Austria.
| | - Tim J Schulz
- Department of Adipocyte Development and Nutrition, German Institute of Human Nutrition, Potsdam-Rehhbrücke, 14558 Nuthetal, Germany.
- German Center for Diabetes Research (DZD), 85764 München-Neuherberg, Germany.
- Institute of Nutritional Science, University of Potsdam, 14558 Nuthetal, Germany.
| | - Michael Schupp
- Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Institute of Pharmacology, Center for Cardiovascular Research, 10117 Berlin, Germany.
| | - Andreas Prokesch
- Gottfried Schatz Research Center for Cell Signaling, Metabolism & Aging, Medical University of Graz, 8010 Graz, Austria.
- BioTechMed-Graz, 8010 Graz, Austria.
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Porteiro B, Fondevila MF, Buque X, Gonzalez-Rellan MJ, Fernandez U, Mora A, Beiroa D, Senra A, Gallego R, Fernø J, López M, Sabio G, Dieguez C, Aspichueta P, Nogueiras R. Pharmacological stimulation of p53 with low-dose doxorubicin ameliorates diet-induced nonalcoholic steatosis and steatohepatitis. Mol Metab 2017; 8:132-143. [PMID: 29290620 PMCID: PMC5985045 DOI: 10.1016/j.molmet.2017.12.005] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/05/2017] [Accepted: 12/12/2017] [Indexed: 12/12/2022] Open
Abstract
Objective Recent reports have implicated the p53 tumor suppressor in the regulation of lipid metabolism. We hypothesized that the pharmacological activation of p53 with low-dose doxorubicin, which is widely used to treat several types of cancer, may have beneficial effects on nonalcoholic fatty liver disease (NAFLD) and nonalcoholic steatohepatitis (NASH). Methods We used long-term pharmacological activation of p53 by i.p. or oral administration of low-dose doxorubicin in different animal models of NAFLD (high fat diet containing 45% and 60% kcal fat) and NASH (methionine- and choline-deficient diet and choline deficiency combined with high fat diet). We also administered doxorubicin in mice lacking p53 in the liver and in two human hepatic cells lines (HepG2 and THLE2). Results The attenuation of liver damage was accompanied by the stimulation of fatty acid oxidation and decrease of lipogenesis, inflammation, and ER stress. The effects of doxorubicin were abrogated in mice with liver-specific ablation of p53. Finally, the effects of doxorubicin on lipid metabolism found in animal models were also present in two human hepatic cells lines, in which the drug stimulated fatty acid oxidation and inhibited de novo lipogenesis at doses that did not cause changes in apoptosis or cell viability. Conclusion These data provide new evidence for targeting p53 as a strategy to treat liver disease. Intraperitoneal and oral low-dose doxorubicin ameliorates NAFLD and NASH in animal models. Doxorubicin requires p53 for its hepatic actions. Doxorubin decreases lipid content in human hepatocytes without affecting cell viability and apoptosis.
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Affiliation(s)
- Begoña Porteiro
- Department of Physiology, CIMUS, University of Santiago de Compostela-Instituto de Investigación Sanitaria, Santiago de Compostela, 15782, Spain; CIBER Fisiopatología de la Obesidad y Nutrición (CIBERobn), 15706, Spain
| | - Marcos F Fondevila
- Department of Physiology, CIMUS, University of Santiago de Compostela-Instituto de Investigación Sanitaria, Santiago de Compostela, 15782, Spain; CIBER Fisiopatología de la Obesidad y Nutrición (CIBERobn), 15706, Spain
| | - Xabier Buque
- Department of Physiology, Faculty of Medicine and Nursing, University of the Basque Country UPV/EHU, Spain; Biocruces Research Institute, Spain
| | - Maria J Gonzalez-Rellan
- Department of Physiology, CIMUS, University of Santiago de Compostela-Instituto de Investigación Sanitaria, Santiago de Compostela, 15782, Spain; CIBER Fisiopatología de la Obesidad y Nutrición (CIBERobn), 15706, Spain
| | - Uxia Fernandez
- Department of Physiology, CIMUS, University of Santiago de Compostela-Instituto de Investigación Sanitaria, Santiago de Compostela, 15782, Spain; CIBER Fisiopatología de la Obesidad y Nutrición (CIBERobn), 15706, Spain
| | - Alfonso Mora
- Centro Nacional de Investigaciones Cardiovasculares Carlos III (CNIC), Madrid, Spain
| | - Daniel Beiroa
- Department of Physiology, CIMUS, University of Santiago de Compostela-Instituto de Investigación Sanitaria, Santiago de Compostela, 15782, Spain; CIBER Fisiopatología de la Obesidad y Nutrición (CIBERobn), 15706, Spain
| | - Ana Senra
- Department of Physiology, CIMUS, University of Santiago de Compostela-Instituto de Investigación Sanitaria, Santiago de Compostela, 15782, Spain
| | - Rosalia Gallego
- Department of Morphological Sciences, School of Medicine, University of Santiago de Compostela-Instituto de Investigación Sanitaria, Santiago de Compostela, 15782, Spain
| | - Johan Fernø
- KG Jebsen Center for Diabetes Research, Department of Clinical Science, University of Bergen, Bergen, Norway; Hormone Laboratory, Haukeland University Hospital, Bergen, Norway
| | - Miguel López
- Department of Physiology, CIMUS, University of Santiago de Compostela-Instituto de Investigación Sanitaria, Santiago de Compostela, 15782, Spain; CIBER Fisiopatología de la Obesidad y Nutrición (CIBERobn), 15706, Spain
| | - Guadalupe Sabio
- Centro Nacional de Investigaciones Cardiovasculares Carlos III (CNIC), Madrid, Spain
| | - Carlos Dieguez
- Department of Physiology, CIMUS, University of Santiago de Compostela-Instituto de Investigación Sanitaria, Santiago de Compostela, 15782, Spain; CIBER Fisiopatología de la Obesidad y Nutrición (CIBERobn), 15706, Spain
| | - Patricia Aspichueta
- Department of Physiology, Faculty of Medicine and Nursing, University of the Basque Country UPV/EHU, Spain; Biocruces Research Institute, Spain
| | - Rubén Nogueiras
- Department of Physiology, CIMUS, University of Santiago de Compostela-Instituto de Investigación Sanitaria, Santiago de Compostela, 15782, Spain; CIBER Fisiopatología de la Obesidad y Nutrición (CIBERobn), 15706, Spain.
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13
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de Oliveira MR, Nabavi SF, Nabavi SM, Jardim FR. Omega-3 polyunsaturated fatty acids and mitochondria, back to the future. Trends Food Sci Technol 2017. [DOI: 10.1016/j.tifs.2017.06.019] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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14
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Yang L, Zhang X, Li H, Liu J. The long noncoding RNA HOTAIR activates autophagy by upregulating ATG3 and ATG7 in hepatocellular carcinoma. MOLECULAR BIOSYSTEMS 2017; 12:2605-12. [PMID: 27301338 DOI: 10.1039/c6mb00114a] [Citation(s) in RCA: 119] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
The long noncoding RNA HOX transcript antisense RNA (HOTAIR) has been reported to be an oncogene that influences tumor cell development and that correlates with prognosis in hepatocellular carcinoma (HCC). Accumulating evidence indicates that autophagy plays a significant role in tumorigenesis and cancer cell survival, but whether HOTAIR modulates autophagy in HCC cells remains unknown. In this study, HOTAIR expression was measured in 54 matched paired HCC tissues and the adjacent non-tumor tissues. HOTAIR was overexpressed in the HCC tissues as compared with the adjacent non-tumor tissues and was associated with tumor size. In vitro assays revealed that the overexpression of HOTAIR promoted the activation of autophagy in HCC cell lines, whereas HOTAIR knockdown suppressed it. Further investigation revealed that overexpressed HOTAIR upregulated autophagy-related 3 (ATG3) and ATG7 expression in HCC cells. In conclusion, HOTAIR, overexpressed in HCC and associated with tumor size, could activate autophagy by increasing ATG3 and ATG7 expression, promoting HCC cell proliferation.
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Affiliation(s)
- Liang Yang
- Department of General Surgery, The Fourth Affiliated Hospital of China Medical University, 4 Chongshan East Street, Shenyang, Liaoning 110032, P. R. China.
| | - Xiuwei Zhang
- Department of General Surgery, The Fourth Affiliated Hospital of China Medical University, 4 Chongshan East Street, Shenyang, Liaoning 110032, P. R. China.
| | - Hangyu Li
- Department of General Surgery, The Fourth Affiliated Hospital of China Medical University, 4 Chongshan East Street, Shenyang, Liaoning 110032, P. R. China.
| | - Jingang Liu
- Department of General Surgery, The Fourth Affiliated Hospital of China Medical University, 4 Chongshan East Street, Shenyang, Liaoning 110032, P. R. China.
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15
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Kanno SI, Tomizawa A, Yomogida S, Hara A. Glutathione peroxidase 3 is a protective factor against acetaminophen‑induced hepatotoxicity in vivo and in vitro. Int J Mol Med 2017; 40:748-754. [PMID: 28677736 PMCID: PMC5547967 DOI: 10.3892/ijmm.2017.3049] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2017] [Accepted: 06/06/2017] [Indexed: 11/10/2022] Open
Abstract
Acetaminophen (APAP) is a widely available antipyretic and analgesic; however, overdose of the drug inflicts severe damage to the liver. It is well established that the hepatotoxicity of APAP is initiated by formation of a reactive metabolite, N-acetyl-p-benzoquinone imine (NAPQI), which can be detoxified by conjugation with reduced glutathione (GSH), a typical antioxidant. We recently found that the blood mRNA expression level of glutathione peroxidase 3 (Gpx3), which catalyzes the oxidation of GSH, is associated with the extent of APAP-induced hepatotoxicity in mice. The present study was carried out to determine the in vivo and in vitro role of GPx3 in APAP-induced hepatotoxicity. In in vivo experiments, oral administration of APAP to mice induced liver injury. Such liver injury was greater in males than in females, although no gender difference in the plasma concentration of APAP was found. Female mice had a 2-fold higher expression of Gpx3 mRNA and higher plasma GPx activity than male mice. 17β-estradiol, a major female hormone, decreased APAP-induced hepatotoxicity and increased both the expression of blood Gpx3 mRNA and plasma GPx activity, suggesting that the cytoprotective action of this hormone is mediated by the increase in GPx3. To further clarify the role of GPx3 in APAP-induced hepatotoxicity, we evaluated the effect of a change in cellular GPx3 expression resulting from transfection of either siRNA-GPx3 or a GPx3 expression vector on NAPQI-induced cellular injury (as assessed by a tetrazolium assay) in in vitro experiments using heterogeneous cultured human cell lines (Huh-7 or K562). NAPQI-induced cell death was reduced by increased GPx3 and was enhanced by decreased GPx3. These results suggest that GPx3 is an important factor for inhibition of APAP-induced hepatotoxicity both in vivo and in vitro. To our knowledge, this is the first report to show a hepatoprotective role of cellular GPx3 against APAP-induced liver damage.
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Affiliation(s)
- Syu-Ichi Kanno
- Department of Clinical Pharmacotherapeutics, Tohoku Medical and Pharmaceutical University, Aoba‑ku, Sendai 981‑8558, Japan
| | - Ayako Tomizawa
- Department of Clinical Pharmacotherapeutics, Tohoku Medical and Pharmaceutical University, Aoba‑ku, Sendai 981‑8558, Japan
| | - Shin Yomogida
- Department of Clinical Pharmacotherapeutics, Tohoku Medical and Pharmaceutical University, Aoba‑ku, Sendai 981‑8558, Japan
| | - Akiyoshi Hara
- Department of Clinical Pharmacotherapeutics, Tohoku Medical and Pharmaceutical University, Aoba‑ku, Sendai 981‑8558, Japan
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16
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Lu Z, Xie D, Chen Y, Tian E, Muhammad I, Chen X, Miao Y, Hu W, Wu Z, Ni H, Xin J, Li Y, Li J. TLR2 mediates autophagy through ERK signaling pathway in Mycoplasma gallisepticum-infected RAW264.7 cells. Mol Immunol 2017; 87:161-170. [PMID: 28478286 DOI: 10.1016/j.molimm.2017.04.013] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2017] [Revised: 04/16/2017] [Accepted: 04/22/2017] [Indexed: 12/11/2022]
Abstract
Toll-like receptor 2 (TLR2) plays a crucial role in early innate immune response of host to various microorganisms. Mycoplasma gallisepticum (MG) is one of the major pathogen that can cause chronic respiratory diseases in chickens, but the molecular mechanism of MG infection still remained unclear. In this study, we examined the typical hallmarks of autophagy and multiple signaling pathways by western blot, immunofluorescence microscopy and electron microscopy. The results indicated that infection of mouse macrophage cell line RAW264.7 with MG activated autophagy and mitogen-activated protein kinases (MAPKs). Silencing of TLR2 by siRNA substantially down-regulated MG-triggered autophagy in macrophages, and markedly reduced MG-induced extracellular regulated protein kinase (ERK) in macrophages but did not down-regulate c-Jun N-terminal kinase (JNK) and p38. Importantly, in macrophages, inhibition of ERK by PD98059 (ERK inhibitor) also significantly attenuated the level of autophagy upon MG infection, and the simultaneous treatment of TLR2 siRNA and PD98059 showed a similar effect on MG-induced autophagy as compared with TLR2 siRNA treatment alone. These findings thus demonstrate that TLR2 may mediate MG-induced autophagy through ERK signaling pathway in macrophage.
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Affiliation(s)
- Ziyin Lu
- College of Veterinary Medicine, Northeast Agricultural University, 59 Mucai Street, Xiangfang District, Harbin 150030, PR China
| | - Daoyuan Xie
- College of Veterinary Medicine, Northeast Agricultural University, 59 Mucai Street, Xiangfang District, Harbin 150030, PR China
| | - Ying Chen
- College of Veterinary Medicine, Northeast Agricultural University, 59 Mucai Street, Xiangfang District, Harbin 150030, PR China
| | - Erjie Tian
- College of Veterinary Medicine, Northeast Agricultural University, 59 Mucai Street, Xiangfang District, Harbin 150030, PR China
| | - Ishfaq Muhammad
- College of Veterinary Medicine, Northeast Agricultural University, 59 Mucai Street, Xiangfang District, Harbin 150030, PR China
| | - Xueping Chen
- College of Veterinary Medicine, Northeast Agricultural University, 59 Mucai Street, Xiangfang District, Harbin 150030, PR China
| | - Yusong Miao
- College of Veterinary Medicine, Northeast Agricultural University, 59 Mucai Street, Xiangfang District, Harbin 150030, PR China
| | - Wanjun Hu
- College of Veterinary Medicine, Northeast Agricultural University, 59 Mucai Street, Xiangfang District, Harbin 150030, PR China
| | - Ziyong Wu
- College of Veterinary Medicine, Northeast Agricultural University, 59 Mucai Street, Xiangfang District, Harbin 150030, PR China
| | - Huili Ni
- College of Veterinary Medicine, Northeast Agricultural University, 59 Mucai Street, Xiangfang District, Harbin 150030, PR China
| | - Jiuqing Xin
- Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, 678 Heping Road, Xiangfang District, Harbin 150030, PR China
| | - Yuan Li
- Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, 678 Heping Road, Xiangfang District, Harbin 150030, PR China
| | - Jichang Li
- College of Veterinary Medicine, Northeast Agricultural University, 59 Mucai Street, Xiangfang District, Harbin 150030, PR China.
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17
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Jin F, Wang Y, Wang X, Wu Y, Wang X, Liu Q, Zhu Y, Liu E, Fan J, Wang Y. Bre Enhances Osteoblastic Differentiation by Promoting the Mdm2-Mediated Degradation of p53. Stem Cells 2017; 35:1760-1772. [PMID: 28436570 DOI: 10.1002/stem.2620] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2016] [Revised: 03/12/2017] [Accepted: 03/21/2017] [Indexed: 01/04/2023]
Abstract
Bre is a conserved cellular protein expressed in various tissues. Its major function includes DNA damage repair and anti-apoptosis. Recent studies indicate that Bre is potentially involved in stem cell differentiation although pathophysiological significance along with the molecular mechanisms is still unclear. Here, we report that Bre protein was substantially expressed in the bone tissue and its expression was highly upregulated during the osteogenic differentiation. To test a hypothesis that Bre plays functional roles in the process of osteogenic differentiation, we examined the expression of Bre in an osteoporosis mouse model. Compared with the normal bone tissue, Bre expression in osteoporotic bone was also significantly reduced. Moreover, knockdown of Bre in the mouse bone marrow mesenchymal cells significantly reduced the expression of osteogenic marker genes, the alkaline phosphatase activity, and the mineralization capacity, while overexpression of Bre greatly promoted the osteogenesis both in vitro and in vivo. Interestingly, we founded that knockdown of Bre led to activation of the p53 signaling pathways exhibited by increased p53, p21, and Mdm2. However, when we inhibited the p53 by siRNA silencing or pifithrin-α, the impaired osteogenesis caused by Bre knockdown was greatly restored. Finally, we found that Bre promoted the Mdm2-mediated p53 ubiquitination and degradation by physically interacting with p53. Taken together, our results revealed a novel function of Bre in osteoblast differentiation through modulating the stability of p53. Stem Cells 2017;35:1760-1772.
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Affiliation(s)
- Fujun Jin
- Guangzhou Jinan Biomedicine Research and Development Center, Institute of Biomedicine, College of Life Science and Technology, Jinan University, Guangzhou, People's Republic of China
| | - Yiliang Wang
- Guangzhou Jinan Biomedicine Research and Development Center, Institute of Biomedicine, College of Life Science and Technology, Jinan University, Guangzhou, People's Republic of China
| | - Xiaojing Wang
- Research Institute of Atherosclerotic Disease, Laboratory Animal Center, School of Medicine, Xi'an Jiaotong University, Xi'an, People's Republic of China
| | - Yanting Wu
- Guangzhou Jinan Biomedicine Research and Development Center, Institute of Biomedicine, College of Life Science and Technology, Jinan University, Guangzhou, People's Republic of China
| | - Xiaoyan Wang
- Guangzhou Jinan Biomedicine Research and Development Center, Institute of Biomedicine, College of Life Science and Technology, Jinan University, Guangzhou, People's Republic of China
| | - Qiuying Liu
- Guangzhou Jinan Biomedicine Research and Development Center, Institute of Biomedicine, College of Life Science and Technology, Jinan University, Guangzhou, People's Republic of China
| | - Yexuan Zhu
- Guangzhou Jinan Biomedicine Research and Development Center, Institute of Biomedicine, College of Life Science and Technology, Jinan University, Guangzhou, People's Republic of China
| | - Enqi Liu
- Research Institute of Atherosclerotic Disease, Laboratory Animal Center, School of Medicine, Xi'an Jiaotong University, Xi'an, People's Republic of China
| | - Jianglin Fan
- Department of Molecular Pathology, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Yamanashi, Japan
| | - Yifei Wang
- Guangzhou Jinan Biomedicine Research and Development Center, Institute of Biomedicine, College of Life Science and Technology, Jinan University, Guangzhou, People's Republic of China
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18
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Laskar K, Faisal SM, Rauf A, Ahmed A, Owais M. Undec-10-enoic acid functionalized chitosan based novel nano-conjugate: An enhanced anti-bacterial/biofilm and anti-cancer potential. Carbohydr Polym 2017; 166:14-23. [PMID: 28385217 DOI: 10.1016/j.carbpol.2017.02.082] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2016] [Revised: 02/07/2017] [Accepted: 02/20/2017] [Indexed: 12/31/2022]
Abstract
Fatty acid functionalized chitosan conjugates are of great interest in cancer therapeutics because of its internalization through receptor mediated endocytosis into the cancer cells. Keeping the above fact into consideration, herein we synthesized the undec-10-enoic acid functionalized chitosan based undecyl-chitosan (U-CS) nano-bioconjugate with the use of DCC as a coupling agent. The U-CS conjugate synthesized was confirmed and characterized by FTIR, 1H NMR, TGA, XRD, SEM and TEM analysis. Generally, it is well established that conjugates of oleic acid with human Alpha-lactalbumin (HAMLET) induce cytotoxicity in the altered cells, but not in healthy cells. To check our presumptions, anti-bacterial and anti-cancer potential of U-CS was evaluated against bacterial pathogens (Gram +ve and Gram -ve) and human cancer cell lines (HeLa, MDA-MB-231 and Hep3B). The results of our study clearly revealed that conjugate showed enhance anti-bacterial, anti-biofilm as well as anti-cancer efficacy as compared to pure and free form of the chitosan.
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Affiliation(s)
| | - Syed Mohd Faisal
- Molecular Immunology Laboratory, Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh 202002, India
| | - Abdul Rauf
- Department of Chemistry, Aligarh Muslim University, Aligarh, 202002, India.
| | - Anees Ahmed
- Hybridoma Laboratory, National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi, 110067, India
| | - Mohammad Owais
- Molecular Immunology Laboratory, Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh 202002, India
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p53 Mediates Colistin-Induced Autophagy and Apoptosis in PC-12 Cells. Antimicrob Agents Chemother 2016; 60:5294-301. [PMID: 27324771 DOI: 10.1128/aac.00641-16] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2016] [Accepted: 06/12/2016] [Indexed: 12/25/2022] Open
Abstract
The mechanism of colistin-induced neurotoxicity is still unknown. Our recent study (L. Zhang, Y. H. Zhao, W. J. Ding, G. Z. Jiang, Z. Y. Lu, L. Li, J. L. Wang, J. Li, and J. C. Li, Antimicrob Agents Chemother 59:2189-2197, 2015, http://dx.doi.org/10.1128/AAC.04092-14; H. Jiang, J. C. Li, T. Zhou, C. H. Wang, H. Zhang, and H. Wang, Int J Mol Med 33:1298-1304, 2014, http://dx.doi.org/10.3892/ijmm.2014.1684) indicates that colistin induces autophagy and apoptosis in rat adrenal medulla PC-12 cells, and there is interplay between both cellular events. As an important cellular stress sensor, phosphoprotein p53 can trigger cell cycle arrest and apoptosis and regulate autophagy. The aim of the present study was to investigate the involvement of the p53 pathway in colistin-induced neurotoxicity in PC-12 cells. Specifically, cells were treated with colistin (125 μg/ml) in the absence and presence of a p53 inhibitor, pifithrin-α (PFT-α; 20 nM), for 12 h and 24 h, and the typical hallmarks of autophagy and apoptosis were examined by fluorescence/immunofluorescence microscopy and electron microscopy, real-time PCR, and Western blotting. The results indicate that colistin had a stimulatory effect on the expression levels of the target genes and proteins involved in autophagy and apoptosis, including LC3-II/I, p53, DRAM (damage-regulated autophagy modulator), PUMA (p53 upregulated modulator of apoptosis), Bax, p-AMPK (activated form of AMP-activated protein kinase), and caspase-3. In contrast, colistin appeared to have an inhibitory effect on the expression of p-mTOR (activated form of mammalian target of rapamycin), which is another target protein in autophagy. Importantly, analysis of the levels of p53 in the cells treated with colistin revealed an increase in nuclear p53 at 12 h and cytoplasmic p53 at 24 h. Pretreatment of colistin-treated cells with PFT-α inhibited autophagy and promoted colistin-induced apoptosis. This is the first study to demonstrate that colistin-induced autophagy and apoptosis are associated with the p53-mediated pathway.
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Yu W, Zhang X, Liu J, Wang X, Li S, Liu R, Liao N, Zhang T, Hai C. Cyclosporine A Suppressed Glucose Oxidase Induced P53 Mitochondrial Translocation and Hepatic Cell Apoptosis through Blocking Mitochondrial Permeability Transition. Int J Biol Sci 2016; 12:198-209. [PMID: 26884717 PMCID: PMC4737676 DOI: 10.7150/ijbs.13716] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2015] [Accepted: 11/09/2015] [Indexed: 12/19/2022] Open
Abstract
P53 is known as a transcription factor to control apoptotic cell death through regulating a series of target genes in nucleus. There is accumulating evidences show that p53 can directly induce cell apoptosis through transcription independent way at mitochondria. However, the mechanism by which p53 translocation into mitochondria in response to oxidative stress remains unclear. Here, glucose oxidase (GOX) was used to induce ROS generation in HepG2 cells and liver tissues of mice. The results showed that p53 was stabilized and translocated to mitochondria in a time and dose dependent manner after GOX exposure. Interestingly, as an inhibitor of mitochondrial permeability transition, cyclosporine A (CsA) was able to effectively reduce GOX mediated mitochondrial p53 distribution without influencing on the expression of p53 target genes including Bcl-2 and Bax. These indicated that CsA could just block p53 entering into mitochondria, but not affect p53-dependent transcription. Meanwhile, CsA failed to inhibit the ROS generation induced by GOX, which indicated that CsA had no antioxidant function. Moreover, GOX induced typical apoptosis characteristics including, mitochondrial dysfunction, accumulation of Bax and release of cytochrome C in mitochondria, accompanied with activation of caspase-9 and caspase-3. These processions were suppressed after pretreatment with CsA and pifithrin-μ (PFT-μ, a specific inhibitor of p53 mitochondrial translocation). In vivo, CsA was able to attenuate p53 mitochondrial distribution and protect mice liver against from GOX mediated apoptotic cell death. Taken together, these suggested that CsA could suppress ROS-mediated p53 mitochondrial distribution and cell apoptosis depended on its inhibition effect to mitochondrial permeability transition. It might be used to rescue the hepatic cell apoptosis in the patients with acute liver injury.
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Affiliation(s)
- Weihua Yu
- 1. Department of Toxicology, the Ministry of Education Key Lab of Hazard Assessment and Control in Special Operational Environment, Shaanxi Provincial Key Lab of Free radical biology and medicine, School of Public Health, The Fourth Military Medical University, Xi'an, 710032, P. R. China
| | - Xiaodi Zhang
- 1. Department of Toxicology, the Ministry of Education Key Lab of Hazard Assessment and Control in Special Operational Environment, Shaanxi Provincial Key Lab of Free radical biology and medicine, School of Public Health, The Fourth Military Medical University, Xi'an, 710032, P. R. China
| | - Jiangzheng Liu
- 1. Department of Toxicology, the Ministry of Education Key Lab of Hazard Assessment and Control in Special Operational Environment, Shaanxi Provincial Key Lab of Free radical biology and medicine, School of Public Health, The Fourth Military Medical University, Xi'an, 710032, P. R. China
| | - Xin Wang
- 1. Department of Toxicology, the Ministry of Education Key Lab of Hazard Assessment and Control in Special Operational Environment, Shaanxi Provincial Key Lab of Free radical biology and medicine, School of Public Health, The Fourth Military Medical University, Xi'an, 710032, P. R. China
| | - Shuang Li
- 2. Department of Cardiology, Xijing Hospital, the Fourth Military Medical University, Xi'an, Shaanxi, 710032, China
| | - Rui Liu
- 1. Department of Toxicology, the Ministry of Education Key Lab of Hazard Assessment and Control in Special Operational Environment, Shaanxi Provincial Key Lab of Free radical biology and medicine, School of Public Health, The Fourth Military Medical University, Xi'an, 710032, P. R. China
| | - Nai Liao
- 1. Department of Toxicology, the Ministry of Education Key Lab of Hazard Assessment and Control in Special Operational Environment, Shaanxi Provincial Key Lab of Free radical biology and medicine, School of Public Health, The Fourth Military Medical University, Xi'an, 710032, P. R. China
| | - Tao Zhang
- 1. Department of Toxicology, the Ministry of Education Key Lab of Hazard Assessment and Control in Special Operational Environment, Shaanxi Provincial Key Lab of Free radical biology and medicine, School of Public Health, The Fourth Military Medical University, Xi'an, 710032, P. R. China
| | - Chunxu Hai
- 1. Department of Toxicology, the Ministry of Education Key Lab of Hazard Assessment and Control in Special Operational Environment, Shaanxi Provincial Key Lab of Free radical biology and medicine, School of Public Health, The Fourth Military Medical University, Xi'an, 710032, P. R. China
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