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Mahé M, Rios-Fuller T, Katsara O, Schneider RJ. Non-canonical mRNA translation initiation in cell stress and cancer. NAR Cancer 2024; 6:zcae026. [PMID: 38828390 PMCID: PMC11140632 DOI: 10.1093/narcan/zcae026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2024] [Revised: 05/08/2024] [Accepted: 05/29/2024] [Indexed: 06/05/2024] Open
Abstract
The now well described canonical mRNA translation initiation mechanism of m7G 'cap' recognition by cap-binding protein eIF4E and assembly of the canonical pre-initiation complex consisting of scaffolding protein eIF4G and RNA helicase eIF4A has historically been thought to describe all cellular mRNA translation. However, the past decade has seen the discovery of alternative mechanisms to canonical eIF4E mediated mRNA translation initiation. Studies have shown that non-canonical alternate mechanisms of cellular mRNA translation initiation, whether cap-dependent or independent, serve to provide selective translation of mRNAs under cell physiological and pathological stress conditions. These conditions typically involve the global downregulation of canonical eIF4E1/cap-mediated mRNA translation, and selective translational reprogramming of the cell proteome, as occurs in tumor development and malignant progression. Cancer cells must be able to maintain physiological plasticity to acquire a migratory phenotype, invade tissues, metastasize, survive and adapt to severe microenvironmental stress conditions that involve inhibition of canonical mRNA translation initiation. In this review we describe the emerging, important role of non-canonical, alternate mechanisms of mRNA translation initiation in cancer, particularly in adaptation to stresses and the phenotypic cell fate changes involved in malignant progression and metastasis. These alternate translation initiation mechanisms provide new targets for oncology therapeutics development.
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Affiliation(s)
- Mélanie Mahé
- Department of Microbiology, NYU Grossman School of Medicine, New York, NY 10016, USA
| | - Tiffany Rios-Fuller
- Department of Microbiology, NYU Grossman School of Medicine, New York, NY 10016, USA
| | - Olga Katsara
- Department of Microbiology, NYU Grossman School of Medicine, New York, NY 10016, USA
| | - Robert J Schneider
- Department of Microbiology, NYU Grossman School of Medicine, New York, NY 10016, USA
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Targeting HIF-1α Function in Cancer through the Chaperone Action of NQO1: Implications of Genetic Diversity of NQO1. J Pers Med 2022; 12:jpm12050747. [PMID: 35629169 PMCID: PMC9146583 DOI: 10.3390/jpm12050747] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2022] [Accepted: 04/25/2022] [Indexed: 02/04/2023] Open
Abstract
HIF-1α is a master regulator of oxygen homeostasis involved in different stages of cancer development. Thus, HIF-1α inhibition represents an interesting target for anti-cancer therapy. It was recently shown that the HIF-1α interaction with NQO1 inhibits proteasomal degradation of the former, thus suggesting that targeting the stability and/or function of NQO1 could lead to the destabilization of HIF-1α as a therapeutic approach. Since the molecular interactions of NQO1 with HIF-1α are beginning to be unraveled, in this review we discuss: (1) Structure–function relationships of HIF-1α; (2) our current knowledge on the intracellular functions and stability of NQO1; (3) the pharmacological modulation of NQO1 by small ligands regarding function and stability; (4) the potential effects of genetic variability of NQO1 in HIF-1α levels and function; (5) the molecular determinants of NQO1 as a chaperone of many different proteins including cancer-associated factors such as HIF-1α, p53 and p73α. This knowledge is then further discussed in the context of potentially targeting the intracellular stability of HIF-1α by acting on its chaperone, NQO1. This could result in novel anti-cancer therapies, always considering that the substantial genetic variability in NQO1 would likely result in different phenotypic responses among individuals.
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3
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Preethi S, Arthiga K, Patil AB, Spandana A, Jain V. Review on NAD(P)H dehydrogenase quinone 1 (NQO1) pathway. Mol Biol Rep 2022; 49:8907-8924. [PMID: 35347544 DOI: 10.1007/s11033-022-07369-2] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Accepted: 03/11/2022] [Indexed: 12/14/2022]
Abstract
NQO1 is an enzyme present in humans which is encoded by NQO1 gene. It is a protective antioxidant agent, versatile cytoprotective agent and regulates the oxidative stresses of chromatin binding proteins for DNA damage in cancer cells. The oxidization of cellular pyridine nucleotides causes structural alterations to NQO1 and changes in its capacity to binding of proteins. A strategy based on NQO1 to have protective effect against cancer was developed by organic components to enhance NQO1 expression. The quinone derivative compounds like mitomycin C, RH1, E09 (Apaziquone) and β-lapachone causes cell death by NQO1 reduction of two electrons. It was also known to be overexpressed in various tumor cells of breast, lung, cervix, pancreas and colon when it was compared with normal cells in humans. The mechanism of NQO1 by the reduction of FAD by NADPH to form FADH2 is by two ways to inhibit cancer cell development such as suppression of carcinogenic metabolic activation and prevention of carcinogen formation. The NQO1 exhibit suppression of chemical-mediated carcinogenesis by various properties of NQO1 which includes, detoxification of quinone scavenger of superoxide anion radical, antioxidant enzyme, protein stabilizer. This review outlines the NQO1 structure, mechanism of action to inhibit the cancer cell, functions of NQO1 against oxidative stress, drugs acting on NQO1 pathways, clinical significance.
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Affiliation(s)
- S Preethi
- Department of Pharmaceutics, JSS College of Pharmacy, JSS Academy of Higher Education & Research, Sri Shivarathreeshwara Nagar, Mysuru, Karnataka, 570015, India
| | - K Arthiga
- Department of Pharmaceutics, JSS College of Pharmacy, JSS Academy of Higher Education & Research, Sri Shivarathreeshwara Nagar, Mysuru, Karnataka, 570015, India
| | - Amit B Patil
- Department of Pharmaceutics, JSS College of Pharmacy, JSS Academy of Higher Education & Research, Sri Shivarathreeshwara Nagar, Mysuru, Karnataka, 570015, India
| | - Asha Spandana
- Department of Pharmaceutics, JSS College of Pharmacy, JSS Academy of Higher Education & Research, Sri Shivarathreeshwara Nagar, Mysuru, Karnataka, 570015, India
| | - Vikas Jain
- Department of Pharmaceutics, JSS College of Pharmacy, JSS Academy of Higher Education & Research, Sri Shivarathreeshwara Nagar, Mysuru, Karnataka, 570015, India.
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Lee WS, Ham W, Kim J. Roles of NAD(P)H:quinone Oxidoreductase 1 in Diverse Diseases. Life (Basel) 2021; 11:life11121301. [PMID: 34947831 PMCID: PMC8703842 DOI: 10.3390/life11121301] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Revised: 11/15/2021] [Accepted: 11/18/2021] [Indexed: 01/07/2023] Open
Abstract
NAD(P)H:quinone oxidoreductase (NQO) is an antioxidant flavoprotein that catalyzes the reduction of highly reactive quinone metabolites by employing NAD(P)H as an electron donor. There are two NQO enzymes—NQO1 and NQO2—in mammalian systems. In particular, NQO1 exerts many biological activities, including antioxidant activities, anti-inflammatory effects, and interactions with tumor suppressors. Moreover, several recent studies have revealed the promising roles of NQO1 in protecting against cardiovascular damage and related diseases, such as dyslipidemia, atherosclerosis, insulin resistance, and metabolic syndrome. In this review, we discuss recent developments in the molecular regulation and biochemical properties of NQO1, and describe the potential beneficial roles of NQO1 in diseases associated with oxidative stress.
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Affiliation(s)
- Wang-Soo Lee
- Division of Cardiology, Department of Internal Medicine, College of Medicine, Chung-Ang University, Seoul 06974, Korea
- Correspondence: (W.-S.L.); (J.K.); Tel.: +82-2-6299-1419 (W.-S.L.); +82-2-6299-1397 (J.K.)
| | - Woojin Ham
- Division of Endocrinology and Metabolism, Department of Internal Medicine, College of Medicine, Chung-Ang University, Seoul 06974, Korea;
| | - Jaetaek Kim
- Division of Endocrinology and Metabolism, Department of Internal Medicine, College of Medicine, Chung-Ang University, Seoul 06974, Korea;
- Correspondence: (W.-S.L.); (J.K.); Tel.: +82-2-6299-1419 (W.-S.L.); +82-2-6299-1397 (J.K.)
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5
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Tsvetkov P, Adler J, Strobelt R, Adamovich Y, Asher G, Reuven N, Shaul Y. NQO1 Binds and Supports SIRT1 Function. Front Pharmacol 2021; 12:671929. [PMID: 34234670 PMCID: PMC8255383 DOI: 10.3389/fphar.2021.671929] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2021] [Accepted: 05/19/2021] [Indexed: 11/13/2022] Open
Abstract
Silent information regulator 2-related enzyme 1 (SIRT1) is an NAD+-dependent class III deacetylase and a key component of the cellular metabolic sensing pathway. The requirement of NAD+ for SIRT1 activity led us to assume that NQO1, an NADH oxidoreductase producing NAD+, regulates SIRT1 activity. We show here that SIRT1 is capable of increasing NQO1 (NAD(P)H Dehydrogenase Quinone 1) transcription and protein levels. NQO1 physically interacts with SIRT1 but not with an enzymatically dead SIRT1 H363Y mutant. The interaction of NQO1 with SIRT1 is markedly increased under mitochondrial inhibition. Interestingly, under this condition the nuclear pool of NQO1 is elevated. Depletion of NQO1 compromises the role of SIRT1 in inducing transcription of several target genes and eliminates the protective role of SIRT1 following mitochondrial inhibition. Our results suggest that SIRT1 and NQO1 form a regulatory loop where SIRT1 regulates NQO1 expression and NQO1 binds and mediates the protective role of SIRT1 during mitochondrial stress. The interplay between an NADH oxidoreductase enzyme and an NAD+ dependent deacetylase may act as a rheostat in sensing mitochondrial stress.
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Affiliation(s)
- Peter Tsvetkov
- Broad Institute of Harvard and MIT, Cambridge, MA, United States
| | - Julia Adler
- Department of Molecular Genetics Weizmann Institute of Science, Rehovot, Israel
| | - Romano Strobelt
- Department of Molecular Genetics Weizmann Institute of Science, Rehovot, Israel
| | - Yaarit Adamovich
- Department of Molecular Genetics Weizmann Institute of Science, Rehovot, Israel
| | - Gad Asher
- Department of Molecular Genetics Weizmann Institute of Science, Rehovot, Israel
| | - Nina Reuven
- Department of Molecular Genetics Weizmann Institute of Science, Rehovot, Israel
| | - Yosef Shaul
- Department of Molecular Genetics Weizmann Institute of Science, Rehovot, Israel
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6
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Ross D, Siegel D. The diverse functionality of NQO1 and its roles in redox control. Redox Biol 2021; 41:101950. [PMID: 33774477 PMCID: PMC8027776 DOI: 10.1016/j.redox.2021.101950] [Citation(s) in RCA: 191] [Impact Index Per Article: 63.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Revised: 03/15/2021] [Accepted: 03/16/2021] [Indexed: 12/20/2022] Open
Abstract
In this review, we summarize the multiple functions of NQO1, its established roles in redox processes and potential roles in redox control that are currently emerging. NQO1 has attracted interest due to its roles in cell defense and marked inducibility during cellular stress. Exogenous substrates for NQO1 include many xenobiotic quinones. Since NQO1 is highly expressed in many solid tumors, including via upregulation of Nrf2, the design of compounds activated by NQO1 and NQO1-targeted drug delivery have been active areas of research. Endogenous substrates have also been proposed and of relevance to redox stress are ubiquinone and vitamin E quinone, components of the plasma membrane redox system. Established roles for NQO1 include a superoxide reductase activity, NAD+ generation, interaction with proteins and their stabilization against proteasomal degradation, binding and regulation of mRNA translation and binding to microtubules including the mitotic spindles. We also summarize potential roles for NQO1 in regulation of glucose and insulin metabolism with relevance to diabetes and the metabolic syndrome, in Alzheimer's disease and in aging. The conformation and molecular interactions of NQO1 can be modulated by changes in the pyridine nucleotide redox balance suggesting that NQO1 may function as a redox-dependent molecular switch.
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Affiliation(s)
- David Ross
- Department of Pharmaceutical Sciences, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of Colorado Anschutz Medical Campus, Aurora, CO, 80045, USA.
| | - David Siegel
- Department of Pharmaceutical Sciences, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of Colorado Anschutz Medical Campus, Aurora, CO, 80045, USA
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Yang Y, Zheng J, Wang M, Zhang J, Tian T, Wang Z, Yuan S, Liu L, Zhu P, Gu F, Fu S, Shan Y, Pan Z, Zhou W. NQO1 promotes an aggressive phenotype in hepatocellular carcinoma via amplifying ERK-NRF2 signaling. Cancer Sci 2020; 112:641-654. [PMID: 33222332 PMCID: PMC7894015 DOI: 10.1111/cas.14744] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2020] [Revised: 10/31/2020] [Accepted: 11/04/2020] [Indexed: 12/13/2022] Open
Abstract
Patients with hepatocellular carcinoma (HCC) are usually diagnosed at the later stages and have poor survival outcomes. New molecules are urgently needed for the prognostic predication and individual treatment. Our study showed that high levels of NQO1 expression frequently exist in HCC with an obvious cancer‐specific pattern. Patients with NQO1‐high tumors are significantly associated with poor survival outcomes and serve as independent predictors. Functional experiments showed that NQO1 promotes the growth and aggressiveness of HCC in both in vitro and in vivo models, and the underlying mechanism involved NQO1‐derived amplification of ERK/p38‐NRF2 signaling. Combined block of ERK and NRF2 signaling generated stronger growth inhibition compared with any single block, especially for HCC with high‐NQO1. Therefore, NQO1 is a potential biomarker for HCC early diagnosis and prognosis prediction, and also attractive for cancer‐specific targets for HCC treatment.
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Affiliation(s)
- Yun Yang
- The Third Department of Hepatic Surgery, Eastern Hepatobiliary Surgery Hospital, Shanghai, China
| | - Jie Zheng
- Department of Intervention, First Affiliated Hospital, Wenzhou Medical University, Zhejiang, China
| | - Mengchao Wang
- The Third Department of Hepatic Surgery, Eastern Hepatobiliary Surgery Hospital, Shanghai, China.,The Center for Liver Disease and Transplantation, General Hospital of Guangzhou Military Command of People's Liberation Army, Guangzhou, China
| | - Jin Zhang
- The Third Department of Hepatic Surgery, Eastern Hepatobiliary Surgery Hospital, Shanghai, China
| | - Tao Tian
- The Third Department of Hepatic Surgery, Eastern Hepatobiliary Surgery Hospital, Shanghai, China
| | - Zhiheng Wang
- The Third Department of Hepatic Surgery, Eastern Hepatobiliary Surgery Hospital, Shanghai, China
| | - Shengxian Yuan
- The Third Department of Hepatic Surgery, Eastern Hepatobiliary Surgery Hospital, Shanghai, China
| | - Lei Liu
- The Third Department of Hepatic Surgery, Eastern Hepatobiliary Surgery Hospital, Shanghai, China
| | - Peng Zhu
- The Third Department of Hepatic Surgery, Eastern Hepatobiliary Surgery Hospital, Shanghai, China
| | - Fangming Gu
- The Third Department of Hepatic Surgery, Eastern Hepatobiliary Surgery Hospital, Shanghai, China
| | - Siyuan Fu
- The Third Department of Hepatic Surgery, Eastern Hepatobiliary Surgery Hospital, Shanghai, China
| | - Yunfeng Shan
- Department of Hepatobiliary Surgery, First Affiliated Hospital, Wenzhou Medical University, Zhejiang, China
| | - Zeya Pan
- The Third Department of Hepatic Surgery, Eastern Hepatobiliary Surgery Hospital, Shanghai, China
| | - Weiping Zhou
- The Third Department of Hepatic Surgery, Eastern Hepatobiliary Surgery Hospital, Shanghai, China.,Key Laboratory of Signaling Regulation and Targeting Therapy of Liver Cancer (SMMU), Ministry of Education, Shanghai, China.,Shanghai Key Laboratory of Hepatobiliary Tumor Biology (EHBH), Shanghai, China
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8
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Di Francesco A, Choi Y, Bernier M, Zhang Y, Diaz-Ruiz A, Aon MA, Kalafut K, Ehrlich MR, Murt K, Ali A, Pearson KJ, Levan S, Preston JD, Martin-Montalvo A, Martindale JL, Abdelmohsen K, Michel CR, Willmes DM, Henke C, Navas P, Villalba JM, Siegel D, Gorospe M, Fritz K, Biswal S, Ross D, de Cabo R. NQO1 protects obese mice through improvements in glucose and lipid metabolism. NPJ Aging Mech Dis 2020; 6:13. [PMID: 33298924 PMCID: PMC7678866 DOI: 10.1038/s41514-020-00051-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2020] [Accepted: 10/21/2020] [Indexed: 02/06/2023] Open
Abstract
Chronic nutrient excess leads to metabolic disorders and insulin resistance. Activation of stress-responsive pathways via Nrf2 activation contributes to energy metabolism regulation. Here, inducible activation of Nrf2 in mice and transgenesis of the Nrf2 target, NQO1, conferred protection from diet-induced metabolic defects through preservation of glucose homeostasis, insulin sensitivity, and lipid handling with improved physiological outcomes. NQO1-RNA interaction mediated the association with and inhibition of the translational machinery in skeletal muscle of NQO1 transgenic mice. NQO1-Tg mice on high-fat diet had lower adipose tissue macrophages and enhanced expression of lipogenic enzymes coincident with reduction in circulating and hepatic lipids. Metabolomics data revealed a systemic metabolic signature of improved glucose handling, cellular redox, and NAD+ metabolism while label-free quantitative mass spectrometry in skeletal muscle uncovered a distinct diet- and genotype-dependent acetylation pattern of SIRT3 targets across the core of intermediary metabolism. Thus, under nutritional excess, NQO1 transgenesis preserves healthful benefits.
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Affiliation(s)
- Andrea Di Francesco
- Translational Gerontology Branch, National Institute on Aging Intramural Program, National Institutes of Health, Baltimore, MD, 21224, USA
- Calico Life Sciences, South San Francisco, CA, USA
| | - Youngshim Choi
- Department of Environmental Health Sciences, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, 21205, USA
- University of Maryland School of Medicine, Baltimore, MD, 21201, USA
| | - Michel Bernier
- Translational Gerontology Branch, National Institute on Aging Intramural Program, National Institutes of Health, Baltimore, MD, 21224, USA
| | - Yingchun Zhang
- Translational Gerontology Branch, National Institute on Aging Intramural Program, National Institutes of Health, Baltimore, MD, 21224, USA
- College of Pharmaceutical Sciences and Chinese Medicine, Southwest University, Chongqing, 475004, People's Republic of China
| | - Alberto Diaz-Ruiz
- Translational Gerontology Branch, National Institute on Aging Intramural Program, National Institutes of Health, Baltimore, MD, 21224, USA
- Nutritional Interventions Group, Precision Nutrition and Aging, Institute IMDEA Food, Crta. de Canto Blanco n° 8, 28049, Madrid, Spain
| | - Miguel A Aon
- Translational Gerontology Branch, National Institute on Aging Intramural Program, National Institutes of Health, Baltimore, MD, 21224, USA
| | - Krystle Kalafut
- Translational Gerontology Branch, National Institute on Aging Intramural Program, National Institutes of Health, Baltimore, MD, 21224, USA
- Harvard T.H. Chan School of Public Health, Boston, MA, 02115, USA
| | - Margaux R Ehrlich
- Translational Gerontology Branch, National Institute on Aging Intramural Program, National Institutes of Health, Baltimore, MD, 21224, USA
- Department Food Science, Cornell University, Ithaca, NY, 14850, USA
| | - Kelsey Murt
- Translational Gerontology Branch, National Institute on Aging Intramural Program, National Institutes of Health, Baltimore, MD, 21224, USA
- Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, 21205, USA
| | - Ahmed Ali
- Translational Gerontology Branch, National Institute on Aging Intramural Program, National Institutes of Health, Baltimore, MD, 21224, USA
- Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Kevin J Pearson
- Translational Gerontology Branch, National Institute on Aging Intramural Program, National Institutes of Health, Baltimore, MD, 21224, USA
- Pharmacology and Nutritional Sciences, University of Kentucky College of Medicine, Lexington, KY, 40536, USA
| | - Sophie Levan
- Translational Gerontology Branch, National Institute on Aging Intramural Program, National Institutes of Health, Baltimore, MD, 21224, USA
| | - Joshua D Preston
- Pharmacology and Nutritional Sciences, University of Kentucky College of Medicine, Lexington, KY, 40536, USA
- Emory University School of Medicine (MD/PhD program), Atlanta, GA, USA
| | - Alejandro Martin-Montalvo
- Translational Gerontology Branch, National Institute on Aging Intramural Program, National Institutes of Health, Baltimore, MD, 21224, USA
- Department of Regeneration and Cell Therapy, Andalusian Center for Molecular Biology and Regenerative Medicine-CABIMER, Junta de Andalucia-University of Pablo de Olavide-University of Seville-CSIC, Seville, Spain
| | - Jennifer L Martindale
- Laboratory of Genetics and Genomics, National Institute on Aging Intramural Program, National Institutes of Health, Baltimore, MD, 21224, USA
| | - Kotb Abdelmohsen
- Laboratory of Genetics and Genomics, National Institute on Aging Intramural Program, National Institutes of Health, Baltimore, MD, 21224, USA
| | - Cole R Michel
- Department of Pharmaceutical Sciences, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of Colorado Anschutz Medical Campus, Aurora, CO, 80045, USA
| | - Diana M Willmes
- Molecular Diabetology, Paul Langerhans Institute Dresden of the Helmholtz German Center for Diabetes Research Munich, University Hospital Carl Gustav Carus and Faculty of Medicine, TU Dresden, 01307, Dresden, Germany
| | - Christine Henke
- Molecular Diabetology, Paul Langerhans Institute Dresden of the Helmholtz German Center for Diabetes Research Munich, University Hospital Carl Gustav Carus and Faculty of Medicine, TU Dresden, 01307, Dresden, Germany
| | - Placido Navas
- Centro Andaluz de Biología del Desarrollo, Universidad Pablo de Olavide-CSIC-JA, 41013, Sevilla, Spain
| | - Jose Manuel Villalba
- Departamento de Biología Celular, Fisiología e Inmunología, Universidad de Córdoba, Campus de Excelencia Internacional Agroalimentario, ceiA3, Sevilla, Spain
| | - David Siegel
- Department of Pharmaceutical Sciences, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of Colorado Anschutz Medical Campus, Aurora, CO, 80045, USA
| | - Myriam Gorospe
- Laboratory of Genetics and Genomics, National Institute on Aging Intramural Program, National Institutes of Health, Baltimore, MD, 21224, USA
| | - Kristofer Fritz
- Department of Pharmaceutical Sciences, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of Colorado Anschutz Medical Campus, Aurora, CO, 80045, USA
| | - Shyam Biswal
- Department of Environmental Health Sciences, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, 21205, USA
| | - David Ross
- Department of Pharmaceutical Sciences, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of Colorado Anschutz Medical Campus, Aurora, CO, 80045, USA
| | - Rafael de Cabo
- Translational Gerontology Branch, National Institute on Aging Intramural Program, National Institutes of Health, Baltimore, MD, 21224, USA.
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NQO1 potentiates apoptosis evasion and upregulates XIAP via inhibiting proteasome-mediated degradation SIRT6 in hepatocellular carcinoma. Cell Commun Signal 2019; 17:168. [PMID: 31842909 PMCID: PMC6915971 DOI: 10.1186/s12964-019-0491-7] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2019] [Accepted: 11/26/2019] [Indexed: 12/11/2022] Open
Abstract
Background Our previous study has demonstrated that NAD(P)H: quinone oxidoreductase 1 (NQO1) is significantly upregulated in human liver cancer where it potentiates the apoptosis evasion of liver cancer cell. However, the underlying mechanisms of the oncogenic function of NQO1 in HCC have not been fully elucidated. Methods Expression of NQO1, SIRT6, AKT and X-linked inhibitor of apoptosis protein (XIAP) protein were measured by western blotting and immunohistochemistry. Additionally, the interaction between NQO1 and potential proteins were determined by immunoprecipitation assays. Furthermore, the effect of NQO1 and SIRT6 on tumor growth was determined in cell model and orthotopic tumor implantation model. Results We found that NQO1 overexpression in HCC enhanced SIRT6 protein stability via inhibiting ubiquitin-mediated 26S proteasome degradation. High level of SIRT6 reduced acetylation of AKT which resulted in increased phosphorylation and activity of AKT. Activated AKT subsequently phosphorylated anti-apoptotic protein XIAP at Ser87 which determined its protein stability. Reintroduction of SIRT6 or AKT efficiently rescued NQO1 knock-out-mediated inhibition of growth and induction of apoptosis. In orthotopic mouse model, NQO1 knock-out inhibited tumor growth and induced apoptosis while this effect was effectively rescued by SIRT6 overexpression or MG132 treatment partially. Conclusions Collectively, these results reveal an oncogenic function of NQO1 in sustaining HCC cell proliferation through SIRT6/AKT/XIAP signaling pathway.
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Cancer-associated variants of human NQO1: impacts on inhibitor binding and cooperativity. Biosci Rep 2019; 39:BSR20191874. [PMID: 31431515 PMCID: PMC6732362 DOI: 10.1042/bsr20191874] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2019] [Revised: 07/26/2019] [Accepted: 08/19/2019] [Indexed: 12/28/2022] Open
Abstract
Human NAD(P)H quinone oxidoreductase (DT-diaphorase, NQO1) exhibits negative cooperativity towards its potent inhibitor, dicoumarol. Here, we addressed the hypothesis that the effects of the two cancer-associated polymorphisms (p.R139W and p.P187S) may be partly mediated by their effects on inhibitor binding and negative cooperativity. Dicoumarol stabilized both variants and bound with much higher affinity for p.R139W than p.P187S. Both variants exhibited negative cooperativity towards dicoumarol; in both cases, the Hill coefficient (h) was approximately 0.5 and similar to that observed with the wild-type protein. NQO1 was also inhibited by resveratrol and by nicotinamide. Inhibition of NQO1 by resveratrol was approximately 10,000-fold less strong than that observed with the structurally similar enzyme, NRH quinine oxidoreductase 2 (NQO2). The enzyme exhibited non-cooperative behaviour towards nicotinamide, whereas resveratrol induced modest negative cooperativity (h = 0.85). Nicotinamide stabilized wild-type NQO1 and p.R139W towards thermal denaturation but had no detectable effect on p.P187S. Resveratrol destabilized the wild-type enzyme and both cancer-associated variants. Our data suggest that neither polymorphism exerts its effect by changing the enzyme’s ability to exhibit negative cooperativity towards inhibitors. However, it does demonstrate that resveratrol can inhibit NQO1 in addition to this compound’s well-documented effects on NQO2. The implications of these findings for molecular pathology are discussed.
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11
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Alard A, Marboeuf C, Fabre B, Jean C, Martineau Y, Lopez F, Vende P, Poncet D, Schneider RJ, Bousquet C, Pyronnet S. Differential Regulation of the Three Eukaryotic mRNA Translation Initiation Factor (eIF) 4Gs by the Proteasome. Front Genet 2019; 10:254. [PMID: 30984242 PMCID: PMC6449437 DOI: 10.3389/fgene.2019.00254] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2018] [Accepted: 03/07/2019] [Indexed: 12/02/2022] Open
Abstract
The 4G family of eukaryotic mRNA translation initiation factors is composed of three members (eIF4GI, eIF4GII, and DAP5). Their specific roles in translation initiation are under intense investigations, but how their respective intracellular amounts are controlled remains poorly understood. Here we show that eIF4GI and eIF4GII exhibit much shorter half-lives than that of DAP5. Both eIF4GI and eIF4GII proteins, but not DAP5, contain computer-predicted PEST motifs in their N-termini conserved across the animal kingdom. They are both sensitive to degradation by the proteasome. Under normal conditions, eIF4GI and eIF4GII are protected from proteasomal destruction through binding to the detoxifying enzyme NQO1 [NAD(P)H:quinone oxidoreductase]. However, when cells are exposed to oxidative stress both eIF4GI and eIF4GII, but not DAP5, are degraded by the proteasome in an N-terminal-dependent manner, and cell viability is more compromised upon silencing of DAP5. These findings indicate that the three eIF4G proteins are differentially regulated by the proteasome and that persistent DAP5 plays a role in cell survival upon oxidative stress.
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Affiliation(s)
- Amandine Alard
- INSERM UMR1037, Centre de Recherche en Cancérologie de Toulouse, Equipe Labellisée Ligue Contre le Cancer and Laboratoire d'Excellence Toulouse Cancer, Université de Toulouse, Toulouse, France
| | - Catherine Marboeuf
- INSERM UMR1037, Centre de Recherche en Cancérologie de Toulouse, Equipe Labellisée Ligue Contre le Cancer and Laboratoire d'Excellence Toulouse Cancer, Université de Toulouse, Toulouse, France
| | - Bertrand Fabre
- INSERM UMR1037, Centre de Recherche en Cancérologie de Toulouse, Equipe Labellisée Ligue Contre le Cancer and Laboratoire d'Excellence Toulouse Cancer, Université de Toulouse, Toulouse, France
| | - Christine Jean
- INSERM UMR1037, Centre de Recherche en Cancérologie de Toulouse, Equipe Labellisée Ligue Contre le Cancer and Laboratoire d'Excellence Toulouse Cancer, Université de Toulouse, Toulouse, France
| | - Yvan Martineau
- INSERM UMR1037, Centre de Recherche en Cancérologie de Toulouse, Equipe Labellisée Ligue Contre le Cancer and Laboratoire d'Excellence Toulouse Cancer, Université de Toulouse, Toulouse, France
| | - Frédéric Lopez
- INSERM UMR1037, Centre de Recherche en Cancérologie de Toulouse, Equipe Labellisée Ligue Contre le Cancer and Laboratoire d'Excellence Toulouse Cancer, Université de Toulouse, Toulouse, France
| | - Patrice Vende
- UMR9198 CEA, Institut de Biologie Intégrative de la Cellule (I2BC), Centre National de la Recherche Scientifique, Université Paris-Sud, Gif-sur-Yvette, France
| | - Didier Poncet
- UMR9198 CEA, Institut de Biologie Intégrative de la Cellule (I2BC), Centre National de la Recherche Scientifique, Université Paris-Sud, Gif-sur-Yvette, France
| | | | - Corinne Bousquet
- INSERM UMR1037, Centre de Recherche en Cancérologie de Toulouse, Equipe Labellisée Ligue Contre le Cancer and Laboratoire d'Excellence Toulouse Cancer, Université de Toulouse, Toulouse, France
| | - Stéphane Pyronnet
- INSERM UMR1037, Centre de Recherche en Cancérologie de Toulouse, Equipe Labellisée Ligue Contre le Cancer and Laboratoire d'Excellence Toulouse Cancer, Université de Toulouse, Toulouse, France
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12
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Maeda T, Fujita Y, Tanabe-Fujimura C, Zou K, Liu J, Liu S, Kikuchi K, Shen X, Nakajima T, Komano H. An E3 Ubiquitin Ligase, Synoviolin, Is Involved in the Degradation of Homocysteine-Inducible Endoplasmic Reticulum Protein. Biol Pharm Bull 2018; 41:915-919. [PMID: 29863080 DOI: 10.1248/bpb.b18-00015] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Homocysteine-inducible endoplasmic reticulum (ER) protein (Herp) is an ER stress-inducible membrane protein involved in ER-associated degradation. Herp expression is maintained at low levels through a strict regulatory mechanism, but the details of this mechanism and the reasons why Herp expression is restricted in this manner remain unclear. Here, we show that Herp degradation involves synoviolin, an ER-resident E3 ubiquitin ligase. Herp protein levels were found to be markedly elevated in synoviolin-null cells, and Herp expression decreased when synoviolin was overexpressed. However, the lysine residues of Herp, which are ubiquitinated by E3 ubiquitin ligase, were not sufficient for regulation of Herp degradation. These results suggest that Herp degradation is mediated via synoviolin and that Herp ubiquitination involves amino acids other than lysine.
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Affiliation(s)
- Tomoji Maeda
- Department of Neuroscience, School of Pharmacy, Iwate Medical University
| | - Yu Fujita
- Department of Neuroscience, School of Pharmacy, Iwate Medical University
| | | | - Kun Zou
- Department of Neuroscience, School of Pharmacy, Iwate Medical University
| | - Junjun Liu
- Department of Neuroscience, School of Pharmacy, Iwate Medical University
| | - Shuyu Liu
- Department of Neuroscience, School of Pharmacy, Iwate Medical University
| | - Kota Kikuchi
- Department of Neuroscience, School of Pharmacy, Iwate Medical University
| | - Xuefeng Shen
- Department of Neuroscience, School of Pharmacy, Iwate Medical University
| | | | - Hiroto Komano
- Department of Neuroscience, School of Pharmacy, Iwate Medical University
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13
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Boroumand M, Pourgholi L, Goodarzynejad H, Ziaee S, Hajhosseini-Talasaz A, Sotoudeh-Anvari M, Mandegary A. NQO1 C609T Polymorphism is Associated with Coronary Artery Disease in a Gender-Dependent Manner. Cardiovasc Toxicol 2017; 17:35-41. [PMID: 26690082 DOI: 10.1007/s12012-015-9353-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Findings on the association of NQO1 C609T polymorphism in the NQO1 gene and cardiovascular disease susceptibility are controversial. The objective of the current study was to examine the relationship between this polymorphism and the presence and severity of angiographically determined coronary artery disease (CAD). One-hundred and forty-five patients with newly diagnosed angiographically documented CAD (≥50 % luminal stenosis of any coronary vessel) as case group were compared to 139 controls (subjects with no luminal stenosis at coronary arteries). The presence of C609T polymorphism was analyzed using polymerase chain reaction-based restriction fragment length polymorphism. Among total population, those with combined CT/TT (T allele carrier) genotype showed a trend toward lower odds of CAD compared to those with CC (wild type) genotype, but it did not reach a statistically significant level (p = 0.061). When data were analyzed separately for men or women, CT + TT group as compared to CC genotype was associated with decreased odds of CAD in women (adjusted OR 0.4, 95 % CI 0.2-0.9; p = 0.043), but not in men (adjusted OR 0.8, 95 % CI 0.3-1.9; p = 0.612). The C609T polymorphism within NQO1 is independently associated with CAD in women, but no association was observed in whole study population or in men.
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Affiliation(s)
- Mohammadali Boroumand
- Department of Clinical Pathology and Laboratory Medicine, Tehran Heart Center, Tehran University of Medical Sciences, Tehran, P.O. Box 1411713138, Iran
| | - Leyla Pourgholi
- Department of Clinical Pathology and Laboratory Medicine, Tehran Heart Center, Tehran University of Medical Sciences, Tehran, P.O. Box 1411713138, Iran.,Department of Pharmacology and Toxicology, School of Pharmacy, Kerman University of Medical Sciences, Kerman, P.O. Box 7616911319, Iran
| | - Hamidreza Goodarzynejad
- Department of Cardiac Research, Tehran Heart Center, Tehran University of Medical Sciences, Tehran, P.O. Box 1411713138, Iran
| | - Shayan Ziaee
- Department of Clinical Pathology and Laboratory Medicine, Tehran Heart Center, Tehran University of Medical Sciences, Tehran, P.O. Box 1411713138, Iran
| | - Azita Hajhosseini-Talasaz
- Department of Clinical Pharmacy, School of Pharmacy, Tehran University of Medical Sciences, Tehran, P.O. Box 141556451, Iran
| | - Maryam Sotoudeh-Anvari
- Department of Clinical Pathology and Laboratory Medicine, Tehran Heart Center, Tehran University of Medical Sciences, Tehran, P.O. Box 1411713138, Iran
| | - Ali Mandegary
- Department of Pharmacology and Toxicology, School of Pharmacy, Kerman University of Medical Sciences, Kerman, P.O. Box 7616911319, Iran. .,Gastroenterology and Hepatology Research Center, Institute of Basic and Clinical Physiology Sciences, Kerman University of Medical Sciences, Kerman, P.O. Box 7616911319, Iran.
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14
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Heat shock protein-27 (HSP27) regulates STAT3 and eIF4G levels in first trimester human placenta. J Mol Histol 2016; 47:555-563. [DOI: 10.1007/s10735-016-9699-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2016] [Accepted: 09/27/2016] [Indexed: 12/31/2022]
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15
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Csizmadia V, Hales P, Tsu C, Ma J, Chen J, Shah P, Fleming P, Senn JJ, Kadambi VJ, Dick L, Wolenski FS. Proteasome inhibitors bortezomib and carfilzomib used for the treatment of multiple myeloma do not inhibit the serine protease HtrA2/Omi. Toxicol Res (Camb) 2016; 5:1619-1628. [PMID: 30090462 PMCID: PMC6062231 DOI: 10.1039/c6tx00220j] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2016] [Accepted: 08/23/2016] [Indexed: 12/26/2022] Open
Abstract
The proteasome inhibitor bortezomib is associated with the development of peripheral neuropathy in patients, but the mechanism is not fully understood.
The proteasome inhibitor bortezomib is associated with the development of peripheral neuropathy in patients, but the mechanism by which bortezomib can induce peripheral neuropathy is not fully understood. One study suggested that off-target inhibition of proteases other than the proteasome, particularly HtraA2/Omi, may be the underlying mechanism of the neuropathy. The same study also concluded that carfilzomib, a second proteasome inhibitor that is associated with less peripheral neuropathy in patients than bortezomib, showed no inhibition of HtrA2/Omi. The goal of the work described here was to determine whether either proteasome inhibitors truly affected HtrA2/Omi activity. A variety of methods were used to test the effects of both bortezomib and carfilzomib on HtrA2/Omi activity that included in vitro recombinant enzyme assays, and studies with the human neuroblastoma SH-SY5Y cell line and HtrA2/Omi-knockout mouse embryonic fibroblasts. The compound ucf-101 was used to assess the effects of specific HtrA2/Omi inhibition. In contrast to previously published data, our results clearly demonstrated that neither bortezomib nor carfilzomib inhibited HtrA2/Omi activity in recombinant enzyme assays at concentrations up to 100 μM, while the specific inhibitor ucf-101 did inhibit the enzyme. The proteasome inhibitors did not inhibit HtrA2/Omi activity in either SH-SY5Y cells or mouse embryonic fibroblasts, as determined by expression of the HtrA2/Omi substrates eIF4G1 and UCH-L1. Based on our biochemical and cell-based assays, we conclude that neither bortezomib nor carfilzomib inhibited HtrA2/Omi activity. Therefore, it is unlikely that bortezomib associated peripheral neuropathy is a direct result of off-target inhibition of HtrA2/Omi.
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Affiliation(s)
- Vilmos Csizmadia
- Millennium Pharmaceuticals , Inc (a wholly owned subsidiary of Takeda Pharmaceutical Company Limited) , Cambridge , MA 02139 , USA . ; ; Tel: +1 617-551-3620
| | - Paul Hales
- Millennium Pharmaceuticals , Inc (a wholly owned subsidiary of Takeda Pharmaceutical Company Limited) , Cambridge , MA 02139 , USA . ; ; Tel: +1 617-551-3620
| | - Christopher Tsu
- Millennium Pharmaceuticals , Inc (a wholly owned subsidiary of Takeda Pharmaceutical Company Limited) , Cambridge , MA 02139 , USA . ; ; Tel: +1 617-551-3620
| | - Jingya Ma
- Millennium Pharmaceuticals , Inc (a wholly owned subsidiary of Takeda Pharmaceutical Company Limited) , Cambridge , MA 02139 , USA . ; ; Tel: +1 617-551-3620
| | - Jiejin Chen
- Millennium Pharmaceuticals , Inc (a wholly owned subsidiary of Takeda Pharmaceutical Company Limited) , Cambridge , MA 02139 , USA . ; ; Tel: +1 617-551-3620
| | - Pooja Shah
- Millennium Pharmaceuticals , Inc (a wholly owned subsidiary of Takeda Pharmaceutical Company Limited) , Cambridge , MA 02139 , USA . ; ; Tel: +1 617-551-3620
| | - Paul Fleming
- Millennium Pharmaceuticals , Inc (a wholly owned subsidiary of Takeda Pharmaceutical Company Limited) , Cambridge , MA 02139 , USA . ; ; Tel: +1 617-551-3620
| | - Joseph J Senn
- Millennium Pharmaceuticals , Inc (a wholly owned subsidiary of Takeda Pharmaceutical Company Limited) , Cambridge , MA 02139 , USA . ; ; Tel: +1 617-551-3620
| | - Vivek J Kadambi
- Millennium Pharmaceuticals , Inc (a wholly owned subsidiary of Takeda Pharmaceutical Company Limited) , Cambridge , MA 02139 , USA . ; ; Tel: +1 617-551-3620
| | - Larry Dick
- Millennium Pharmaceuticals , Inc (a wholly owned subsidiary of Takeda Pharmaceutical Company Limited) , Cambridge , MA 02139 , USA . ; ; Tel: +1 617-551-3620
| | - Francis S Wolenski
- Millennium Pharmaceuticals , Inc (a wholly owned subsidiary of Takeda Pharmaceutical Company Limited) , Cambridge , MA 02139 , USA . ; ; Tel: +1 617-551-3620
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16
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NAD(P)H quinone oxidoreductase 1 inhibits the proteasomal degradation of homocysteine-induced endoplasmic reticulum protein. Biochem Biophys Res Commun 2016; 473:1276-1280. [DOI: 10.1016/j.bbrc.2016.04.057] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2016] [Accepted: 04/12/2016] [Indexed: 01/14/2023]
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17
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Bian J, Qian X, Deng B, Xu X, Guo X, Wang Y, Li X, Sun H, You Q, Zhang X. Discovery of NAD(P)H:quinone oxidoreductase 1 (NQO1) inhibitors with novel chemical scaffolds by shape-based virtual screening combined with cascade docking. RSC Adv 2015. [DOI: 10.1039/c5ra05919d] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A number of novel NAD(P)H:quinone oxidoreductase 1 (NQO1) inhibitors were discovered from the ChemDiv database via a simple protocol.
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18
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Kostecka A, Sznarkowska A, Meller K, Acedo P, Shi Y, Mohammad Sakil HA, Kawiak A, Lion M, Królicka A, Wilhelm M, Inga A, Zawacka-Pankau J. JNK-NQO1 axis drives TAp73-mediated tumor suppression upon oxidative and proteasomal stress. Cell Death Dis 2014; 5:e1484. [PMID: 25341038 PMCID: PMC4649515 DOI: 10.1038/cddis.2014.408] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2014] [Revised: 07/24/2014] [Accepted: 08/18/2014] [Indexed: 12/17/2022]
Abstract
Hyperproliferating cancer cells produce energy mainly from aerobic glycolysis, which results in elevated ROS levels. Thus aggressive tumors often possess enhanced anti-oxidant capacity that impedes many current anti-cancer therapies. Additionally, in ROS-compromised cancer cells ubiquitin proteasome system (UPS) is often deregulated for timely removal of oxidized proteins, thus enabling cell survival. Taken that UPS maintains the turnover of factors controlling cell cycle and apoptosis--such as p53 or p73, it represents a promising target for pharmaceutical intervention. Enhancing oxidative insult in already ROS-compromised cancer cells appears as an attractive anti-tumor scenario. TAp73 is a bona fide tumor suppressor that drives the chemosensitivity of some cancers to cisplatin or γ-radiation. It is an important drug target in tumors where p53 is lost or mutated. Here we discovered a novel synergistic mechanism leading to potent p73 activation and cancer cell death by oxidative stress and inhibition of 20S proteasomes. Using a small-molecule inhibitor of 20S proteasome and ROS-inducer--withaferin A (WA), we found that WA-induced ROS activates JNK kinase and stabilizes phase II anti-oxidant response effector NF-E2-related transcription factor (NRF2). This results in activation of Nrf2 target--NQO1 (NADPH quinone oxidoreductase), and TAp73 protein stabilization. The observed effect was ablated by the ROS scavenger--NAC. Concurrently, stress-activated JNK phosphorylates TAp73 at multiple serine and threonine residues, which is crucial to ablate TAp73/MDM2 complex and to promote TAp73 transcriptional function and induction of robust apoptosis. Taken together our data demonstrate that ROS insult in combination with the inhibition of 20S proteasome and TAp73 activation endows synthetic lethality in cancer cells. Thus, our results may enable the establishment of a novel pharmacological strategy to exploit the enhanced sensitivity of tumors to elevated ROS and proteasomal stress to kill advanced tumors by pharmacological activation of TAp73 using molecules like WA.
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Affiliation(s)
- A Kostecka
- Department of Biotechnology, Intercollegiate Faculty of Biotechnology, University of Gdansk and Medical University of Gdansk, Gdansk, Poland
| | - A Sznarkowska
- Department of Biotechnology, Intercollegiate Faculty of Biotechnology, University of Gdansk and Medical University of Gdansk, Gdansk, Poland
| | - K Meller
- Department of Biotechnology, Intercollegiate Faculty of Biotechnology, University of Gdansk and Medical University of Gdansk, Gdansk, Poland
| | - P Acedo
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden
| | - Y Shi
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden
| | - H A Mohammad Sakil
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden
| | - A Kawiak
- Department of Biotechnology, Intercollegiate Faculty of Biotechnology, University of Gdansk and Medical University of Gdansk, Gdansk, Poland
| | - M Lion
- Centre for Integrative Biology, CIBIO, University of Trento, Mattarello, Italy
| | - A Królicka
- Department of Biotechnology, Intercollegiate Faculty of Biotechnology, University of Gdansk and Medical University of Gdansk, Gdansk, Poland
| | - M Wilhelm
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden
| | - A Inga
- Centre for Integrative Biology, CIBIO, University of Trento, Mattarello, Italy
| | - J Zawacka-Pankau
- 1] Department of Biotechnology, Intercollegiate Faculty of Biotechnology, University of Gdansk and Medical University of Gdansk, Gdansk, Poland [2] Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden
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19
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Attar-Schneider O, Drucker L, Zismanov V, Tartakover-Matalon S, Lishner M. Targeting eIF4GI translation initiation factor affords an attractive therapeutic strategy in multiple myeloma. Cell Signal 2014; 26:1878-87. [DOI: 10.1016/j.cellsig.2014.05.005] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2014] [Revised: 04/29/2014] [Accepted: 05/02/2014] [Indexed: 01/04/2023]
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20
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Zhang HM, Dai H, Hanson PJ, Li H, Guo H, Ye X, Hemida MG, Wang L, Tong Y, Qiu Y, Liu S, Wang F, Song F, Zhang B, Wang JG, Zhang LX, Yang D. Antiviral activity of an isatin derivative via induction of PERK-Nrf2-mediated suppression of cap-independent translation. ACS Chem Biol 2014; 9:1015-24. [PMID: 24547890 DOI: 10.1021/cb400775z] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
We report here an isatin derivative 45 (ID45) against coxsackievirus B3 (CVB3) replication, which was synthesized based on a high-throughput screen of a unique natural product library. ID45 showed the most potent anti-CVB3 activity among the four synthesized compounds. Treatment of cells with ID45 before or after infection significantly reduced viral particle formation, resulting in protection of cells from virus-induced apoptosis. In addition, ID45 treatment caused remarkable up-regulation of glucose-regulated protein 78 (GRP78), a hallmark of endoplasmic reticulum (ER) stress and an indicator of enhanced cell viability. In identifying the ER stress response pathway induced by ID45, we found that ID45 activated PKR-like ER protein kinase (PERK) but failed to up-regulate eIF2α phosphorylation. Instead ID45 activated transcription factor Nrf2 (NF-E2-related factor-2), which is evidenced by its nuclear translocation and upregulation of its downstream target genes NQO1 (NAD(P)H quinone-oxidoreductase 1) and GCLM (glutamate-cysteine ligase, modifier subunit). This observation was further verified by using siRNAs of GRP78 or Nrf2, which blocked both the translocation of Nrf2 and up-regulation of its target genes, leading to aggressive viral replication and enhanced cell apoptosis. Finally, we found that ID45-induced up-regulation of NQO1 protected eIF4GI, a eukaryotic cap-dependent translation initiation factor, from cleavage by CVB3 protease and degradation by proteasomes. Taken together, our findings established that a novel antiviral mechanism of isatin derivative ID45 inhibits CVB3 replication by promoting cell survival through a PERK/Nrf2-dependent ER stress pathway, which benefits host cap-dependent translation but suppresses CVB3 cap-independent translation.
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Affiliation(s)
- Huifang M. Zhang
- Department
of Pathology and Laboratory Medicine, University of British Columbia, Institute for Heart and Lung Health, St. Paul’s Hospital, Vancouver, BC V6Z 1Y6, Canada
| | - Huanqin Dai
- Key Laboratory of Pathogenic Microbiology & Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
| | - Paul J. Hanson
- Department
of Pathology and Laboratory Medicine, University of British Columbia, Institute for Heart and Lung Health, St. Paul’s Hospital, Vancouver, BC V6Z 1Y6, Canada
| | - Huidong Li
- State-Key
Laboratory and Institute of Elemento-Organic Chemistry, Nankai University, Tianjin, China
| | - Hui Guo
- Key Laboratory of Pathogenic Microbiology & Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
- Graduate
University, Chinese Academy of Sciences, Beijing, China
| | - Xin Ye
- Department
of Pathology and Laboratory Medicine, University of British Columbia, Institute for Heart and Lung Health, St. Paul’s Hospital, Vancouver, BC V6Z 1Y6, Canada
| | - Maged G. Hemida
- Department
of Pathology and Laboratory Medicine, University of British Columbia, Institute for Heart and Lung Health, St. Paul’s Hospital, Vancouver, BC V6Z 1Y6, Canada
| | - Luoqiang Wang
- Key Laboratory of Pathogenic Microbiology & Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
- School
of Life Sciences, Anhui University, Hefei, China
| | - Yaojun Tong
- Key Laboratory of Pathogenic Microbiology & Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
- Graduate
University, Chinese Academy of Sciences, Beijing, China
| | - Ye Qiu
- Department
of Pathology and Laboratory Medicine, University of British Columbia, Institute for Heart and Lung Health, St. Paul’s Hospital, Vancouver, BC V6Z 1Y6, Canada
| | - Selina Liu
- Department
of Pathology and Laboratory Medicine, University of British Columbia, Institute for Heart and Lung Health, St. Paul’s Hospital, Vancouver, BC V6Z 1Y6, Canada
| | - Fengping Wang
- Department
of Pathology and Laboratory Medicine, University of British Columbia, Institute for Heart and Lung Health, St. Paul’s Hospital, Vancouver, BC V6Z 1Y6, Canada
- Department
of Emergency, Harbin Medical University, Heilongjiang, China
| | - Fuhang Song
- Key Laboratory of Pathogenic Microbiology & Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
| | - Buchang Zhang
- School
of Life Sciences, Anhui University, Hefei, China
| | - Jian-Guo Wang
- State-Key
Laboratory and Institute of Elemento-Organic Chemistry, Nankai University, Tianjin, China
| | - Li-Xin Zhang
- Key Laboratory of Pathogenic Microbiology & Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
- School
of Life Sciences, Anhui University, Hefei, China
| | - Decheng Yang
- Department
of Pathology and Laboratory Medicine, University of British Columbia, Institute for Heart and Lung Health, St. Paul’s Hospital, Vancouver, BC V6Z 1Y6, Canada
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21
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Zhu L, Barret EC, Xu Y, Liu Z, Manoharan A, Chen Y. Regulation of Cigarette Smoke (CS)-Induced Autophagy by Nrf2. PLoS One 2013; 8:e55695. [PMID: 23585825 PMCID: PMC3621864 DOI: 10.1371/journal.pone.0055695] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2012] [Accepted: 01/02/2013] [Indexed: 11/19/2022] Open
Abstract
Cigarette smoke (CS) has been reported to induce autophagy in airway epithelial cells. The subsequent autophagic cell death has been proposed to play an important pathogenic role in chronic obstructive pulmonary disease (COPD); however, the underlying molecular mechanism is not entirely clear. Using CS extract (CSE) as a surrogate for CS, we found that it markedly increased the expressions of both LC3B-I and LC3B-II as well as autophagosomes in airway epithelial cells. This is in contrast to the common autophagy inducer (i.e., starvation) that increases LC3B-II but reduces LC3B-I. Further studies indicate that CSE regulated LC3B at transcriptional and post-translational levels. In addition, CSE, but not starvation, activated Nrf2-mediated adaptive response. Increase of cellular Nrf2 by either Nrf2 overexpression or the knockdown of Keap1 (an Nrf2 inhibitor) significantly repressed CSE-induced LC3B-I and II as well as autophagosomes. Supplement of NAC (a GSH precursor) or GSH recapitulated the effect of Nrf2, suggesting the increase of cellular GSH level is responsible for Nrf2 effect on LC3B and autophagosome. Interestingly, neither Nrf2 activation nor GSH supplement could restore the repressed activities of mTOR or its downstream effctor-S6K. Thus, the Nrf2-dependent autophagy-suppression was not due to the re-activation of mTOR-the master repressor of autophagy. To search for the downstream effector of Nrf2 on LC3B and autophagosome, we tested Nrf2-dependent genes (i.e., NQO1 and P62) that are also increased by CSE treatment. We found that P62, but not NQO1, could mimic the effect of Nrf2 activation by repressing LC3B expression. Thus, Nrf2->P62 appears to play an important role in the regulation of CSE-induced LC3B and autophagosome.
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Affiliation(s)
- Lingxiang Zhu
- Department of Pharmacology and Toxicology, University of Arizona, Tucson, Arizona, United States of America
| | - Erika C. Barret
- Department of Pharmacology and Toxicology, University of Arizona, Tucson, Arizona, United States of America
| | - Yuxue Xu
- Department of Pharmacology and Toxicology, University of Arizona, Tucson, Arizona, United States of America
- School of Medicine, Xiamen University, Xiamen, China
| | - Zuguo Liu
- School of Medicine, Xiamen University, Xiamen, China
| | - Aditya Manoharan
- Department of Pharmacology and Toxicology, University of Arizona, Tucson, Arizona, United States of America
| | - Yin Chen
- Department of Pharmacology and Toxicology, University of Arizona, Tucson, Arizona, United States of America
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Azar R, Lasfargues C, Bousquet C, Pyronnet S. Contribution of HIF-1α in 4E-BP1 gene expression. Mol Cancer Res 2012; 11:54-61. [PMID: 23175522 DOI: 10.1158/1541-7786.mcr-12-0095] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The eukaryotic translation initiation factor 4E (eIF4E) is necessary for the translation of capped mRNAs into proteins. Cap-dependent mRNA translation can be however inhibited by the eIF4E-binding protein 1 (4E-BP1). The hypophosphorylated forms of 4E-BP1 indeed sequester eIF4E and thus block translation initiation and consequent protein synthesis. Different reports indicate that, in addition to hypophosphorylation, 4E-BP1 function can be also regulated at the level of protein expression. This is the case in contact-inhibited cells or in cells exposed to hypoxia. The molecular mechanisms responsible for 4E-BP1 protein accumulation in these conditions remain however unknown. In the present study, we found that 4E-BP1 gene promoter contains a hypoxia-responsive element (HRE) that mediates 4E-BP1 gene upregulation via the hypoxia-inducible factor-1 alpha (HIF-1α) transcription factor. Gene reporter assays then revealed that the presence of such HRE in the promoter of 4E-BP1 gene is involved in 4E-BP1 accumulation in contact-inhibited cells and in cells exposed to hypoxia. We also reveal that the TGF-β-dependent transcription factor SMAD4 cooperates with HIF-1α to fully activate 4E-BP1 gene transcription under hypoxia. These data therefore suggest that HIF-1α contributes to 4E-BP1 gene expression under different conditions.
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Affiliation(s)
- Rania Azar
- Institut national de la santé et de la recherche medicale (INSERM) U1037, BP 84225, Toulouse 31432, France
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23
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A mutually inhibitory feedback loop between the 20S proteasome and its regulator, NQO1. Mol Cell 2012; 47:76-86. [PMID: 22793692 DOI: 10.1016/j.molcel.2012.05.049] [Citation(s) in RCA: 85] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2011] [Revised: 02/14/2012] [Accepted: 05/31/2012] [Indexed: 01/18/2023]
Abstract
NAD(P)H:quinone-oxidoreductase-1 (NQO1) is a cytosolic enzyme that catalyzes the reduction of various quinones using flavin adenine dinucleotide (FAD) as a cofactor. NQO1 has been also shown to rescue proteins containing intrinsically unstructured domains, such as p53 and p73, from degradation by the 20S proteasome through an unknown mechanism. Here, we studied the nature of interaction between NQO1 and the 20S proteasome. Our study revealed a double negative feedback loop between NQO1 and the 20S proteasome, whereby NQO1 prevents the proteolytic activity of the 20S proteasome and the 20S proteasome degrades the apo form of NQO1. Furthermore, we demonstrate, both in vivo and in vitro, that NQO1 levels are highly dependent on FAD concentration. These observations suggest a link between 20S proteolysis and the metabolic cellular state. More generally, the results may represent a regulatory mechanism by which associated cofactors dictate the stability of proteins, thus coordinating protein levels with the metabolic status.
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24
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Scarpa ES, Bonfili L, Eleuteri AM, La Teana A, Brugè F, Bertoli E, Littarru GP, Cacciamani T. ATP independent proteasomal degradation of NQO1 in BL cell lines. Biochimie 2012; 94:1242-9. [PMID: 22586705 DOI: 10.1016/j.biochi.2012.02.014] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Human NAD(P)H: quinone oxidoreductase 1 (NQO1) catalyzes the obligatory two-electron reduction of quinones. For this peculiar catalytic mechanism, the enzyme is considered an important cytoprotector. The NQO1 gene is expressed in all human tissues, unless a polymorphism due to C609T point mutation is present. This polymorphism produces a null phenotype in the homozygous condition and reduced enzyme activity in the heterozygous one. We previously demonstrated that two cell lines of haematopoietic origin, HL60 and Raji cells, possess the same heterozygous genotype, but different phenotypes; as expected for a heterozygous condition the HL60 cell line showed a low level of enzyme activity, while the Raji cell line appeared as null phenotype. The level of NQO1 mRNA was similar in the two cell lines and the different phenotype was not due to additional mutations or to expression of alternative splicing products. Here we show that in Raji BL cell line with heterozygous genotype the null NQO1 phenotype is due to 20S proteasome degradation of wild type and mutant protein isoforms and is not directly linked to C609T polymorphism. This finding may have important implications in B-cell differentiation, in leukaemia risk evaluation and in chemotherapy based on proteasome inhibitors.
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Affiliation(s)
- Emanuele S Scarpa
- Università Politecnica delle Marche, Dipartimento di Scienze della Vita e dell’Ambiente, via Brecce Bianche, 60131 Ancona, Italia
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25
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Hyun DH, Kim J, Moon C, Lim CJ, de Cabo R, Mattson MP. The plasma membrane redox enzyme NQO1 sustains cellular energetics and protects human neuroblastoma cells against metabolic and proteotoxic stress. AGE (DORDRECHT, NETHERLANDS) 2012; 34:359-370. [PMID: 21487704 PMCID: PMC3312640 DOI: 10.1007/s11357-011-9245-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2011] [Accepted: 03/23/2011] [Indexed: 05/30/2023]
Abstract
The plasma membrane redox system (PMRS) of nicotinamide adenine dinucleotide (NADH)-related enzymes plays a key role in the maintenance of cellular energetics. During the aging process, neural cells are particularly sensitive to impaired energy metabolism and oxidative damage, but the involvement of the PMRS in these processes is unknown. Here, we used human neuroblastoma cells with either elevated or reduced levels of the PMRS enzyme NADH-quinone oxidoreductase 1 (NQO1) to investigate how the PMRS regulates neuronal stress responses. Cells with elevated NQO1 levels were more resistant to death induced by 2-deoxyglucose, potassium cyanide (energetic stress), and lactacystin (proteotoxic stress), but were not protected from being killed by H(2)O(2) and serum withdrawal. The NAD(+)(an oxidized form of NADH)/NADH ratio was maintained at a significantly higher level in cells overexpressing NQO1, consistent with enhanced levels of NQO1 activity. Levels of the neuroprotective transcription factors nuclear factor kappa-light-chain-enhancer of activated B cells and nuclear factor (erythroid-derived 2)-like 2, and the protein chaperone HSP70 were elevated in cells overexpressing NQO1. Cells in which NQO1 levels were decreased by RNA interference exhibited increased vulnerability to death induced by 2-deoxyglucose and lactacystin. Thus, a higher NAD(+)/NADH ratio and activation of adaptive stress response pathways are enhanced by the PMRS in neuroblastoma cells, enabling them to maintain redox homeostasis under conditions of energetic and proteotoxic stress. These findings have implications for the development of therapeutic interventions for neural tumors and neurodegenerative conditions.
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Affiliation(s)
- Dong-Hoon Hyun
- Division of Life and Pharmaceutical Sciences, Department of Life Science, Ewha Womans University, Seoul, South Korea.
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26
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NAD(P)H:Quinone Oxidoreductase 1 and its Potential Protective Role in Cardiovascular Diseases and Related Conditions. Cardiovasc Toxicol 2011; 12:39-45. [DOI: 10.1007/s12012-011-9136-9] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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27
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Scott KA, Barnes J, Whitehead RC, Stratford IJ, Nolan KA. Inhibitors of NQO1: Identification of compounds more potent than dicoumarol without associated off-target effects. Biochem Pharmacol 2011; 81:355-63. [DOI: 10.1016/j.bcp.2010.10.011] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2010] [Revised: 10/13/2010] [Accepted: 10/14/2010] [Indexed: 01/20/2023]
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28
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Dinkova-Kostova AT, Talalay P. NAD(P)H:quinone acceptor oxidoreductase 1 (NQO1), a multifunctional antioxidant enzyme and exceptionally versatile cytoprotector. Arch Biochem Biophys 2010; 501:116-23. [PMID: 20361926 PMCID: PMC2930038 DOI: 10.1016/j.abb.2010.03.019] [Citation(s) in RCA: 532] [Impact Index Per Article: 38.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2010] [Revised: 03/17/2010] [Accepted: 03/25/2010] [Indexed: 12/30/2022]
Abstract
NAD(P)H:quinone acceptor oxidoreductase 1 (NQO1) is a widely-distributed FAD-dependent flavoprotein that promotes obligatory 2-electron reductions of quinones, quinoneimines, nitroaromatics, and azo dyes, at rates that are comparable with NADH or NADPH. These reductions depress quinone levels and thereby minimize opportunities for generation of reactive oxygen intermediates by redox cycling, and for depletion of intracellular thiol pools. NQO1 is a highly-inducible enzyme that is regulated by the Keap1/Nrf2/ARE pathway. Evidence for the importance of the antioxidant functions of NQO1 in combating oxidative stress is provided by demonstrations that induction of NQO1 levels or their depletion (knockout, or knockdown) are associated with decreased and increased susceptibilities to oxidative stress, respectively. Furthermore, benzene genotoxicity is markedly enhanced when NQO1 activity is compromised. Not surprisingly, human polymorphisms that suppress NQO1 activities are associated with increased predisposition to disease. Recent studies have uncovered protective roles for NQO1 that apparently are unrelated to its enzymatic activities. NQO1 binds to and thereby stabilizes the important tumor suppressor p53 against proteasomal degradation. Indeed, NQO1 appears to regulate the degradative fate of other proteins. These findings suggest that NQO1 may exercise a selective "gatekeeping" role in regulating the proteasomal degradation of specific proteins, thereby broadening the cytoprotective role of NQO1 far beyond its highly effective antioxidant functions.
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Affiliation(s)
- Albena T. Dinkova-Kostova
- Biomedical Research Institute, University of Dundee, Dundee, Scotland, UK
- Lewis B. and Dorothy Cullman Chemoprotection Center and Department of Pharmacology and Molecular Sciences, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Paul Talalay
- Lewis B. and Dorothy Cullman Chemoprotection Center and Department of Pharmacology and Molecular Sciences, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
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29
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Ryan A, Wang CJ, Laurieri N, Westwood I, Sim E. Reaction mechanism of azoreductases suggests convergent evolution with quinone oxidoreductases. Protein Cell 2010; 1:780-90. [PMID: 21203919 DOI: 10.1007/s13238-010-0090-2] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2010] [Accepted: 06/28/2010] [Indexed: 01/17/2023] Open
Abstract
Azoreductases are involved in the bioremediation by bacteria of azo dyes found in waste water. In the gut flora, they activate azo pro-drugs, which are used for treatment of inflammatory bowel disease, releasing the active component 5-aminosalycilic acid. The bacterium P. aeruginosa has three azoreductase genes, paAzoR1, paAzoR2 and paAzoR3, which as recombinant enzymes have been shown to have different substrate specificities. The mechanism of azoreduction relies upon tautomerisation of the substrate to the hydrazone form. We report here the characterization of the P. aeruginosa azoreductase enzymes, including determining their thermostability, cofactor preference and kinetic constants against a range of their favoured substrates. The expression levels of these enzymes during growth of P. aeruginosa are altered by the presence of azo substrates. It is shown that enzymes that were originally described as azoreductases, are likely to act as NADH quinone oxidoreductases. The low sequence identities observed among NAD(P)H quinone oxidoreductase and azoreductase enzymes suggests convergent evolution.
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Affiliation(s)
- Ali Ryan
- Department of Pharmacology, University of Oxford, Mansfield Road, Oxford, OX1 3QT, UK
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30
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Sanchez A, Wadhani S, Grammas P. Multiple neurotrophic effects of VEGF on cultured neurons. Neuropeptides 2010; 44:323-31. [PMID: 20430442 PMCID: PMC2879433 DOI: 10.1016/j.npep.2010.04.002] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/19/2009] [Revised: 03/03/2010] [Accepted: 04/06/2010] [Indexed: 01/17/2023]
Abstract
A large literature demonstrates the multifunctional nature of vascular endothelial growth factor (VEGF). Though initially characterized as an endothelial cell-specific factor, recent studies reveal that VEGF has numerous effects on diverse cell types in the brain including neurons. The objective of this study is to examine the effects of VEGF in cultured cortical neurons on survival, p38 mitogen-activated protein kinase (p38 MAP kinase) activity, pro- and anti-apoptotic protein expression and on release of neurotrophic and neurotoxic factors. The results show that VEGF dose-dependently enhances the survival of neurons in culture. VEGF decreases active caspase 3 levels and increases expression of the anti-apoptotic protein Bcl-2. VEGF decreases phosphorylated p38 MAP kinase level and activity in cortical neurons. In addition to modulating survival/death pathways in cortical neurons, VEGF also regulates release of proteins that affect neuronal viability. VEGF causes a dose-dependent release of the neurotrophic protein pigment epithelial-derived factor (PEDF), while significantly decreasing release of the neurotoxic protein amyloid beta. The VEGF-mediated decrease in amyloid beta is dependent on a functional Flt-1 receptor and is inhibited by dicoumarol, a multifunctional inhibitor of stress-activated protein kinase (SAPK)/JNK and NFkappaB pathways. Taken together, these data demonstrate that the neurotrophic effects of VEGF are likely mediated directly by increasing survival and decreasing apoptotic proteins and signals as well as indirectly by modulating release of proteins that affect neuronal viability.
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Affiliation(s)
- Alma Sanchez
- Garrison Institute on Aging and Department of Neurology Texas Tech University Health Sciences Center, Lubbock, Texas
| | - Suchin Wadhani
- Garrison Institute on Aging and Department of Neurology Texas Tech University Health Sciences Center, Lubbock, Texas
| | - Paula Grammas
- Garrison Institute on Aging and Department of Neurology Texas Tech University Health Sciences Center, Lubbock, Texas
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31
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Gibbings D, Voinnet O. Control of RNA silencing and localization by endolysosomes. Trends Cell Biol 2010; 20:491-501. [PMID: 20630759 DOI: 10.1016/j.tcb.2010.06.001] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2010] [Revised: 05/31/2010] [Accepted: 06/02/2010] [Indexed: 01/24/2023]
Abstract
Recent advances in the cell biology of RNA silencing have unraveled an intriguing association of post-transcriptionally regulated RNA with endolysosomal membranes in several circumstances of mRNA localization, microRNA activity and viral RNA transport and packaging. Endolysosomal membranes are a nexus of communication and transport between cells and their exterior environment for signaling receptors, pathogens and nutrients. Here, we discuss recent data that support a view that endolysosomal positioning of RNA might facilitate intercellular transmission of RNA and host defence against viruses and retrotransposons. Positioning of RNA regulatory mechanisms on endolysosomal membranes might permit rapid and localized control of microRNA (miRNA) gene regulatory programs and mRNA translation in response to environmental signals, such as activated plasma membrane receptors transported on endosomes. Finally, we suggest that the pathology of several conditions, including Huntington's disease, might be a consequence of the disruption of the control of RNA via endolysosomal membranes.
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Affiliation(s)
- Derrick Gibbings
- UPR2357, Centre National de la Recherche Scientifique, Institut de Biologie Moleculaire des Plantes, 12 rue du General Zimmer, 67084 Strasbourg France.
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