1
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Wang G, Li Z, Lin P, Zhang H, Wang Y, Zhang T, Wang H, Li H, Lin L, Zhao Y, Jia L, Chen Y, Ji H, Zhao W, Fu Z, Zhong Z. Knockdown of Smox protects the integrity of the blood-brain barrier through antioxidant effect and Nrf2 pathway activation in stroke. Int Immunopharmacol 2024; 126:111183. [PMID: 37984250 DOI: 10.1016/j.intimp.2023.111183] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Revised: 10/23/2023] [Accepted: 11/01/2023] [Indexed: 11/22/2023]
Abstract
Once an ischemic stroke occurs, reactive oxygen species (ROS) and oxidative stress degrade the tight connections between cerebral endothelial cells resulting in their damage. The expression of antioxidant genes may be enhanced, and ROS formation may be reduced following Nrf2 activation, which is associated with protection against ischemic stroke. Overexpression of spermine oxidase (Smox) in the neocortex led to increased H2O2 production. However, how Smox impacts the regulation of the blood-brain barrier (BBB) through antioxidants has not been examined yet. We conducted experiments both in the cell level and in the transient middle cerebral artery occlusion (tMCAO) model to evaluate the effect of Smox siRNA lentivirus (si-Smox) knockdown on BBB protection against ischemic stroke. Mice treated with si-Smox showed remarkably decreased BBB breakdown and reduced endothelial inflammation following stroke. The treatment with si-Smox significantly elevated the Bcl-2 to Bax ratio and decreased the production of cleaved caspase-3 in the tMCAO model. Further investigation revealed that the neuroprotective effect was the result of the antioxidant properties of si-Smox, which reduced oxidative stress and enhanced CD31+ cells in the peri-infarct cortical areas. Of significance, si-Smox activated Nrf2 in both bEnd.3 cells and tMCAO animals, and blocking Nrf2 with brusatol diminished the protective effects of si-Smox. The study findings suggest that si-Smox exerts neuroprotective effects and promotes angiogenesis by activating the Nrf2 pathway, thus decreasing oxidative stress and apoptosis caused by tMCAO. As a result, si-Smox may hold potential as a therapeutic candidate for preserving BBB integrity while treating ischemic stroke.
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Affiliation(s)
- Guangtian Wang
- Teaching Center of Pathogenic Biology, School of Basic Medical Sciences, Harbin Medical University, Harbin, Heilongjiang 150081, China
| | - Zhihui Li
- Department of Neurology, The Fourth Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150086, China
| | - Peng Lin
- Department of Biochemistry and Molecular Biology, Harbin Medical University, Harbin, Heilongjiang 150081, China
| | - Huishu Zhang
- Teaching Center of Biotechnology, School of Basic Medical Sciences, Harbin Medical University, Harbin, Heilongjiang 150081, China
| | - Yanyan Wang
- Teaching Center of Morphology, School of Basic Medical Sciences, Harbin Medical University, Harbin, Heilongjiang 150081, China
| | - Tongshuai Zhang
- Department of Neurobiology, School of Basic Medical Sciences, Harbin Medical University, Harbin, Heilongjiang 150081, China
| | - Hui Wang
- Teaching Center of Pathogenic Biology, School of Basic Medical Sciences, Harbin Medical University, Harbin, Heilongjiang 150081, China
| | - Heming Li
- Teaching Center of Pathogenic Biology, School of Basic Medical Sciences, Harbin Medical University, Harbin, Heilongjiang 150081, China
| | - Lexun Lin
- Teaching Center of Pathogenic Biology, School of Basic Medical Sciences, Harbin Medical University, Harbin, Heilongjiang 150081, China
| | - Yuehui Zhao
- Teaching Center of Pathogenic Biology, School of Basic Medical Sciences, Harbin Medical University, Harbin, Heilongjiang 150081, China
| | - Lina Jia
- Teaching Center of Pathogenic Biology, School of Basic Medical Sciences, Harbin Medical University, Harbin, Heilongjiang 150081, China
| | - Yang Chen
- Teaching Center of Pathogenic Biology, School of Basic Medical Sciences, Harbin Medical University, Harbin, Heilongjiang 150081, China
| | - Hong Ji
- Teaching Center of Pathogenic Biology, School of Basic Medical Sciences, Harbin Medical University, Harbin, Heilongjiang 150081, China
| | - Wenran Zhao
- Department of Cell Biology, School of Basic Medical Sciences, Harbin Medical University, Harbin, Heilongjiang 150081, China
| | - Zhongqiu Fu
- Department of Neonatology, Zhuhai Women and Children's Hospital, Zhuhai, Guangdong 519000, China.
| | - Zhaohua Zhong
- Teaching Center of Pathogenic Biology, School of Basic Medical Sciences, Harbin Medical University, Harbin, Heilongjiang 150081, China.
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2
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Treatment with MDL 72527 Ameliorated Clinical Symptoms, Retinal Ganglion Cell Loss, Optic Nerve Inflammation, and Improved Visual Acuity in an Experimental Model of Multiple Sclerosis. Cells 2022; 11:cells11244100. [PMID: 36552864 PMCID: PMC9776605 DOI: 10.3390/cells11244100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2022] [Revised: 12/07/2022] [Accepted: 12/13/2022] [Indexed: 12/24/2022] Open
Abstract
Multiple Sclerosis (MS) is a highly disabling neurological disease characterized by inflammation, neuronal damage, and demyelination. Vision impairment is one of the major clinical features of MS. Previous studies from our lab have shown that MDL 72527, a pharmacological inhibitor of spermine oxidase (SMOX), is protective against neurodegeneration and inflammation in the models of diabetic retinopathy and excitotoxicity. In the present study, utilizing the experimental autoimmune encephalomyelitis (EAE) model of MS, we determined the impact of SMOX blockade on retinal neurodegeneration and optic nerve inflammation. The increased expression of SMOX observed in EAE retinas was associated with a significant loss of retinal ganglion cells, degeneration of synaptic contacts, and reduced visual acuity. MDL 72527-treated mice exhibited markedly reduced motor deficits, improved neuronal survival, the preservation of synapses, and improved visual acuity compared to the vehicle-treated group. The EAE-induced increase in macrophage/microglia was markedly reduced by SMOX inhibition. Upregulated acrolein conjugates in the EAE retina were decreased through MDL 72527 treatment. Mechanistically, the EAE-induced ERK-STAT3 signaling was blunted by SMOX inhibition. In conclusion, our studies demonstrate the potential benefits of targeting SMOX to treat MS-mediated neuroinflammation and vision loss.
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3
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The Involvement of Polyamines Catabolism in the Crosstalk between Neurons and Astrocytes in Neurodegeneration. Biomedicines 2022; 10:biomedicines10071756. [PMID: 35885061 PMCID: PMC9312548 DOI: 10.3390/biomedicines10071756] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2022] [Revised: 07/18/2022] [Accepted: 07/19/2022] [Indexed: 11/19/2022] Open
Abstract
In mammalian cells, the content of polyamines is tightly regulated. Polyamines, including spermine, spermidine and putrescine, are involved in many cellular processes. Spermine oxidase specifically oxidizes spermine, and its deregulated activity has been reported to be linked to brain pathologies involving neuron damage. Spermine is a neuromodulator of a number of ionotropic glutamate receptors and types of ion channels. In this respect, the Dach-SMOX mouse model overexpressing spermine oxidase in the neocortex neurons was revealed to be a model of chronic oxidative stress, excitotoxicity and neuronal damage. Reactive astrocytosis, chronic oxidative and excitotoxic stress, neuron loss and the susceptibility to seizure in the Dach-SMOX are discussed here. This genetic model would help researchers understand the linkage between polyamine dysregulation and neurodegeneration and unveil the roles of polyamines in the crosstalk between astrocytes and neurons in neuroprotection or neurodegeneration.
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4
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Marcoli M, Cervetto C, Amato S, Fiorucci C, Maura G, Mariottini P, Cervelli M. Transgenic Mouse Overexpressing Spermine Oxidase in Cerebrocortical Neurons: Astrocyte Dysfunction and Susceptibility to Epileptic Seizures. Biomolecules 2022; 12:204. [PMID: 35204705 PMCID: PMC8961639 DOI: 10.3390/biom12020204] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Revised: 01/20/2022] [Accepted: 01/21/2022] [Indexed: 02/06/2023] Open
Abstract
Polyamines are organic polycations ubiquitously present in living cells. Polyamines are involved in many cellular processes, and their content in mammalian cells is tightly controlled. Among their function, these molecules modulate the activity of several ion channels. Spermine oxidase, specifically oxidized spermine, is a neuromodulator of several types of ion channel and ionotropic glutamate receptors, and its deregulated activity has been linked to several brain pathologies, including epilepsy. The Dach-SMOX mouse line was generated using a Cre/loxP-based recombination approach to study the complex and critical functions carried out by spermine oxidase and spermine in the mammalian brain. This mouse genetic model overexpresses spermine oxidase in the neocortex and is a chronic model of excitotoxic/oxidative injury and neuron vulnerability to oxidative stress and excitotoxic, since its phenotype revealed to be more susceptible to different acute oxidative insults. In this review, the molecular mechanisms underlined the Dach-SMOX phenotype, linked to reactive astrocytosis, neuron loss, chronic oxidative and excitotoxic stress, and susceptibility to seizures have been discussed in detail. The Dach-SMOX mouse model overexpressing SMOX may help in shedding lights on the susceptibility to epileptic seizures, possibly helping to understand the mechanisms underlying epileptogenesis in vulnerable individuals and contributing to provide new molecular mechanism targets to search for novel antiepileptic drugs.
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Affiliation(s)
- Manuela Marcoli
- Department of Pharmacy, Section of Pharmacology and Toxicology, University of Genova, Viale Cembrano 4, 16148 Genoa, Italy; (S.A.); (G.M.)
- Interuniversity Center for the Promotion of the 3Rs Principles in Teaching and Research (Centro 3R), Lucio Lazzarino 1, 56122 Pisa, Italy
| | - Chiara Cervetto
- Department of Pharmacy, Section of Pharmacology and Toxicology, University of Genova, Viale Cembrano 4, 16148 Genoa, Italy; (S.A.); (G.M.)
- Interuniversity Center for the Promotion of the 3Rs Principles in Teaching and Research (Centro 3R), Lucio Lazzarino 1, 56122 Pisa, Italy
| | - Sarah Amato
- Department of Pharmacy, Section of Pharmacology and Toxicology, University of Genova, Viale Cembrano 4, 16148 Genoa, Italy; (S.A.); (G.M.)
| | - Cristian Fiorucci
- Department of Science, University of Rome “Roma Tre”, Viale Marconi 446, 00146 Rome, Italy; (C.F.); (P.M.)
| | - Guido Maura
- Department of Pharmacy, Section of Pharmacology and Toxicology, University of Genova, Viale Cembrano 4, 16148 Genoa, Italy; (S.A.); (G.M.)
| | - Paolo Mariottini
- Department of Science, University of Rome “Roma Tre”, Viale Marconi 446, 00146 Rome, Italy; (C.F.); (P.M.)
| | - Manuela Cervelli
- Department of Science, University of Rome “Roma Tre”, Viale Marconi 446, 00146 Rome, Italy; (C.F.); (P.M.)
- Neurodevelopment, Neurogenetics and Molecular Neurobiology Unit, IRCCS Fondazione Santa Lucia, Via del Fosso di Fiorano 64, 00143 Rome, Italy
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5
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Neree AT, Soret R, Marcocci L, Pietrangeli P, Pilon N, Mateescu MA. Vegetal diamine oxidase alleviates histamine-induced contraction of colonic muscles. Sci Rep 2020; 10:21563. [PMID: 33299054 PMCID: PMC7726047 DOI: 10.1038/s41598-020-78134-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2020] [Accepted: 11/20/2020] [Indexed: 02/08/2023] Open
Abstract
Excess of histamine in gut lumen generates a pronounced gastrointestinal discomfort, which may include diarrhea and peristalsis dysfunctions. Deleterious effects of histamine can be alleviated with antihistamine drugs targeting histamine receptors. However, many antihistamine agents come with various undesirable side effects. Vegetal diamine oxidase (vDAO) might be a relevant alternative owing to its histaminase activity. Mammalian intestinal mucosa contains an endogenous DAO, yet possessing lower activity compared to that of vDAO preparation. Moreover, in several pathological conditions such as inflammatory bowel disease and irritable bowel syndrome, this endogenous DAO enzyme can be lost or inactivated. Here, we tested the therapeutic potential of vDAO by focusing on the well-known effect of histamine on gut motility. Using ex vivo and in vitro assays, we found that vDAO is more potent than commercial anti-histamine drugs at inhibiting histamine-induced contraction of murine distal colon muscles. We also identified pyridoxal 5′-phosphate (the biologically active form of vitamin B6) as an effective enhancer of vDAO antispasmodic activity. Furthermore, we discovered that rectally administered vDAO can be retained on gut mucosa and remain active. These observations make administration of vDAO in the gut lumen a valid alternative treatment for histamine-induced intestinal dysfunctions.
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Affiliation(s)
- Armelle Tchoumi Neree
- Department of Chemistry, Research Chair on Enteric Dysfunctions "Allerdys", University of Quebec at Montreal, Montreal, QC, H3C 3P8, Canada.,Centre d'Excellence en Recherche sur les Maladies Orphelines - Fondation Courtois (CERMO-FC), University of Quebec at Montreal, Montreal, QC, H2X 3Y7, Canada
| | - Rodolphe Soret
- Department of Biological Sciences, Research Chair on Rare Genetic Diseases, University of Quebec at Montreal, Montreal, QC, H2X 3Y7, Canada.,Centre d'Excellence en Recherche sur les Maladies Orphelines - Fondation Courtois (CERMO-FC), University of Quebec at Montreal, Montreal, QC, H2X 3Y7, Canada
| | - Lucia Marcocci
- Department of Biochemical Sciences "A. Rossi Fanelli", Sapienza University of Rome, 00185, Rome, Italy
| | - Paola Pietrangeli
- Department of Biochemical Sciences "A. Rossi Fanelli", Sapienza University of Rome, 00185, Rome, Italy
| | - Nicolas Pilon
- Department of Biological Sciences, Research Chair on Rare Genetic Diseases, University of Quebec at Montreal, Montreal, QC, H2X 3Y7, Canada. .,Centre d'Excellence en Recherche sur les Maladies Orphelines - Fondation Courtois (CERMO-FC), University of Quebec at Montreal, Montreal, QC, H2X 3Y7, Canada. .,Department of Pediatrics, University of Montreal, Montreal, QC, H3T 1C5, Canada.
| | - Mircea Alexandru Mateescu
- Department of Chemistry, Research Chair on Enteric Dysfunctions "Allerdys", University of Quebec at Montreal, Montreal, QC, H3C 3P8, Canada. .,Centre d'Excellence en Recherche sur les Maladies Orphelines - Fondation Courtois (CERMO-FC), University of Quebec at Montreal, Montreal, QC, H2X 3Y7, Canada.
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6
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Reinoso-Sánchez JF, Baroli G, Duranti G, Scaricamazza S, Sabatini S, Valle C, Morlando M, Casero RA, Bozzoni I, Mariottini P, Ceci R, Cervelli M. Emerging Role for Linear and Circular Spermine Oxidase RNAs in Skeletal Muscle Physiopathology. Int J Mol Sci 2020; 21:E8227. [PMID: 33153123 PMCID: PMC7663755 DOI: 10.3390/ijms21218227] [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: 09/17/2020] [Revised: 10/28/2020] [Accepted: 11/01/2020] [Indexed: 12/28/2022] Open
Abstract
Skeletal muscle atrophy is a pathological condition so far without effective treatment and poorly understood at a molecular level. Emerging evidence suggest a key role for circular RNAs (circRNA) during myogenesis and their deregulation has been reported to be associated with muscle diseases. Spermine oxidase (SMOX), a polyamine catabolic enzyme plays a critical role in muscle differentiation and the existence of a circRNA arising from SMOX gene has been recently identified. In this study, we evaluated the expression profile of circular and linear SMOX in both C2C12 differentiation and dexamethasone-induced myotubes atrophy. To validate our findings in vivo their expression levels were also tested in two murine models of amyotrophic lateral sclerosis: SOD1G93A and hFUS+/+, characterized by progressive muscle atrophy. During C2C12 differentiation, linear and circular SMOX show the same trend of expression. Interestingly, in atrophy circSMOX levels significantly increased compared to the physiological state, in both in vitro and in vivo models. Our study demonstrates that SMOX represents a new player in muscle physiopathology and provides a scientific basis for further investigation on circSMOX RNA as a possible new therapeutic target for the treatment of muscle atrophy.
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MESH Headings
- Amyotrophic Lateral Sclerosis/genetics
- Amyotrophic Lateral Sclerosis/metabolism
- Amyotrophic Lateral Sclerosis/pathology
- Animals
- Cell Differentiation/genetics
- Cells, Cultured
- Disease Models, Animal
- Female
- Male
- Mice
- Mice, Inbred C57BL
- Mice, Transgenic
- Muscle Fibers, Skeletal/pathology
- Muscle Fibers, Skeletal/physiology
- Muscle, Skeletal/metabolism
- Muscle, Skeletal/pathology
- Muscular Atrophy/genetics
- Muscular Atrophy/metabolism
- Muscular Atrophy/pathology
- Oxidoreductases Acting on CH-NH Group Donors/genetics
- Oxidoreductases Acting on CH-NH Group Donors/physiology
- RNA, Circular/physiology
- RNA, Messenger/physiology
- RNA, Untranslated/physiology
- RNA-Binding Protein FUS/genetics
- Superoxide Dismutase-1/genetics
- Polyamine Oxidase
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Affiliation(s)
- Jonathan Fernando Reinoso-Sánchez
- Department of Science, “Department of Excellence 2018–2022”, University of Rome “Roma Tre”, 00146 Rome, Italy; (J.F.R.-S.); (G.B.); (P.M.)
| | - Giulia Baroli
- Department of Science, “Department of Excellence 2018–2022”, University of Rome “Roma Tre”, 00146 Rome, Italy; (J.F.R.-S.); (G.B.); (P.M.)
| | - Guglielmo Duranti
- Laboratory of Biochemistry and Molecular Biology—Department of Movement, Human and Health Sciences, University of Rome “Foro Italico”, 00135 Rome, Italy; (G.D.); (S.S.); (R.C.)
| | | | - Stefania Sabatini
- Laboratory of Biochemistry and Molecular Biology—Department of Movement, Human and Health Sciences, University of Rome “Foro Italico”, 00135 Rome, Italy; (G.D.); (S.S.); (R.C.)
| | - Cristiana Valle
- IRCCS Fondazione Santa Lucia, 00179 Rome, Italy;
- National Research Council, Institute of Translational Pharmacology (IFT), 00133 Rome, Italy
| | - Mariangela Morlando
- Department of Pharmaceutical Sciences, “Department of Excellence 2018–2022”, University of Perugia, 06123 Perugia, Italy;
| | - Robert Anthony Casero
- Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University, Baltimore, MD 21287, USA;
| | - Irene Bozzoni
- Department of Biology and Biotechnology “Charles Darwin”, University of Rome “La Sapienza”, 00185 Rome, Italy;
- Center for Life Nano Science@Sapienza, Istituto Italiano di Tecnologia, 00161 Rome, Italy
| | - Paolo Mariottini
- Department of Science, “Department of Excellence 2018–2022”, University of Rome “Roma Tre”, 00146 Rome, Italy; (J.F.R.-S.); (G.B.); (P.M.)
| | - Roberta Ceci
- Laboratory of Biochemistry and Molecular Biology—Department of Movement, Human and Health Sciences, University of Rome “Foro Italico”, 00135 Rome, Italy; (G.D.); (S.S.); (R.C.)
| | - Manuela Cervelli
- Department of Science, “Department of Excellence 2018–2022”, University of Rome “Roma Tre”, 00146 Rome, Italy; (J.F.R.-S.); (G.B.); (P.M.)
- IRCCS Fondazione Santa Lucia, 00179 Rome, Italy;
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7
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Wang G, Han B, Shen L, Wu S, Yang L, Liao J, Wu F, Li M, Leng S, Zang F, Zhang Y, Bai Y, Mao Y, Chen B, Yao H. Silencing of circular RNA HIPK2 in neural stem cells enhances functional recovery following ischaemic stroke. EBioMedicine 2020; 52:102660. [PMID: 32062357 PMCID: PMC7016383 DOI: 10.1016/j.ebiom.2020.102660] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2019] [Revised: 01/15/2020] [Accepted: 01/22/2020] [Indexed: 02/06/2023] Open
Abstract
Background Circular RNAs (circRNAs) have been reported to be involved in central nervous system (CNS) diseases and to have a close connection with neuronal development. However, the role of circRNAs in neural stem cell (NSC) differentiation and the treatment of ischaemic stroke remains unknown. Methods Ischaemic stroke was induced in mice using transient middle cerebral artery occlusion (tMCAO). NSCs were transducted with circHIPK2 siRNA (si-circHIPK2-NSCs) or vehicle control (si-circCon-NSCs) and microinjected into lateral ventricle of brain at 7 d post-tMCAO. Magnetic resonance imaging (MRI) was used to detect brain damage, and functional deficits were evaluated with sensorimotor behavioural tests. The distribution of the transplanted NSCs was investigated by near-infrared fluorescence imaging (NIF) and immunofluorescence. The neural plasticity of si-circHIPK2-NSCs was verified by western blot and immunofluorescence in vivo and in vitro. Findings We investigated the role of circHIPK2 in NCS differentiation. In vitro, silencing of circHIPK2 facilitated NSCs directionally differentiated to neurons but had no effect on the differentiation to astrocytes. In vivo, microinjected NSCs could migrate to the ischaemic hemisphere after stroke induction. Si-circHIPK2-NSCs increased neuronal plasticity in the ischaemic brain, conferred long-lasting neuroprotection, and significantly reduced functional deficits. Interpretations Si-circHIPK2 regulates NSC differentiation, and microinjection of si-circHIPK2-NSCs exhibits a promising therapeutic strategy to neuroprotection and functional recovery after stroke. Funding The National Key Research and Development Program of China; the International Cooperation and Exchange of the National Natural Science Foundation of China; the National Natural Science Foundation of China; the Jiangsu Innovation & Entrepreneurship Team Program.
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Affiliation(s)
- Guangtian Wang
- Department of Pharmacology, School of Medicine, Southeast University, Nanjing 210009, China
| | - Bing Han
- Department of Pharmacology, School of Medicine, Southeast University, Nanjing 210009, China
| | - Ling Shen
- Department of Pharmacology, School of Medicine, Southeast University, Nanjing 210009, China
| | - Shusheng Wu
- Department of Pharmacology, School of Medicine, Southeast University, Nanjing 210009, China
| | - Li Yang
- Department of Pharmacology, School of Medicine, Southeast University, Nanjing 210009, China
| | - Jiefeng Liao
- Department of Pharmacology, School of Medicine, Southeast University, Nanjing 210009, China
| | - Fangfang Wu
- Department of Pharmacology, School of Medicine, Southeast University, Nanjing 210009, China
| | - Mingyue Li
- Department of Pharmacology, School of Medicine, Southeast University, Nanjing 210009, China
| | - Shuo Leng
- Department of Radiology, School of Medicine, Southeast University, Nanjing 210009, China
| | - Fengchao Zang
- Department of Radiology, School of Medicine, Southeast University, Nanjing 210009, China
| | - Yuan Zhang
- Department of Pharmacology, School of Medicine, Southeast University, Nanjing 210009, China
| | - Ying Bai
- Department of Pharmacology, School of Medicine, Southeast University, Nanjing 210009, China
| | - Yu Mao
- State Key Laboratory of Bioelectronics, Jiangsu Key Laboratory for Biomaterials and Devices, School of Biological Sciences & Medical Engineering, Southeast University, Nanjing 210009, China
| | - Bo Chen
- Materials Science and Devices Institute, Suzhou University of Science and Technology, Suzhou 215009, China
| | - Honghong Yao
- Department of Pharmacology, School of Medicine, Southeast University, Nanjing 210009, China; Institute of Life Sciences, Key Laboratory of Developmental Genes and Human Disease, Southeast University, Nanjing 210009, China; Co-innovation Centre of Neuroregeneration, Nantong University, Nantong 226001, China.
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8
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Di Paolo ML, Cervelli M, Mariottini P, Leonetti A, Polticelli F, Rosini M, Milelli A, Basagni F, Venerando R, Agostinelli E, Minarini A. Exploring the activity of polyamine analogues on polyamine and spermine oxidase: methoctramine, a potent and selective inhibitor of polyamine oxidase. J Enzyme Inhib Med Chem 2019; 34:740-752. [PMID: 30829081 PMCID: PMC6407594 DOI: 10.1080/14756366.2019.1584620] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2018] [Revised: 02/06/2019] [Accepted: 02/14/2019] [Indexed: 01/16/2023] Open
Abstract
Fourteen polyamine analogues, asymmetric or symmetric substituted spermine (1-9) or methoctramine (10-14) analogues, were evaluated as potential inhibitors or substrates of two enzymes of the polyamine catabolic pathway, spermine oxidase (SMOX) and acetylpolyamine oxidase (PAOX). Compound 2 turned out to be the best substrate for PAOX, having the highest affinity and catalytic efficiency with respect to its physiological substrates. Methoctramine (10), a well-known muscarinic M2 receptor antagonist, emerged as the most potent competitive PAOX inhibitor known so far (Ki = 10 nM), endowed with very good selectivity compared with SMOX (Ki=1.2 μM vs SMOX). The efficacy of methoctramine in inhibiting PAOX activity was confirmed in the HT22 cell line. Methoctramine is a very promising tool in the design of drugs targeting the polyamine catabolism pathway, both to understand the physio-pathological role of PAOX vs SMOX and for pharmacological applications, being the polyamine pathway involved in various pathologies.
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Affiliation(s)
| | | | | | | | - Fabio Polticelli
- Department of Sciences, University of Roma Tre, Roma, Italy
- Roma Tre Section, National Institute of Nuclear Physics, Roma, Italy
| | - Michela Rosini
- Department of Pharmacy and Biotechnology, Alma Mater Studiorum-University of Bologna, Bologna, Italy
| | - Andrea Milelli
- Department for Life Quality Studies, Alma Mater Studiorum-University of Bologna, Rimini, Italy
| | - Filippo Basagni
- Department of Pharmacy and Biotechnology, Alma Mater Studiorum-University of Bologna, Bologna, Italy
| | - Rina Venerando
- Department of Molecular Medicine, University of Padova, Padova, Italy
| | - Enzo Agostinelli
- Department of Biochemical Science "A. Rossi Fanelli", University of Rome "La Sapienza", Rome, Italy
- International Polyamines Foundation – ONLUS –Via del Forte Tiburtino 98, Rome, Italy
| | - Anna Minarini
- Department of Pharmacy and Biotechnology, Alma Mater Studiorum-University of Bologna, Bologna, Italy
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9
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Fratini E, Cervelli M, Mariottini P, Kanamori Y, Amendola R, Agostinelli E. Link between spermine oxidase and apoptosis antagonizing transcription factor: A new pathway in neuroblastoma. Int J Oncol 2019; 55:1149-1156. [PMID: 31545418 DOI: 10.3892/ijo.2019.4878] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2019] [Accepted: 07/19/2019] [Indexed: 11/05/2022] Open
Abstract
Neuroblastoma (NB) is a heterogeneous extra‑cranial childhood type of cancer, responsible for approximately 15% of all paediatric cancer‑related deaths. Although several critical genetic aberrations have been related to NB, only a few established molecular markers have been associated with prognosis [V‑myc avian myelocytomatosis viral oncogene (MYCN) locus amplification, deletions of part of chromosome 1p, 11q23 and gain of 17q]. Regrettably, direct evidence of NB‑related tumour suppressors or oncogenes has not been currently identified at these chromosomal regions. MYCN locus amplification is present in approximately 20‑30% of cases and is associated with a poor clinical outcome, representing the most important genetic prognostic marker. The functional guidelines for the prognosis of NB identify high‑risk patients (<40% survival probabilities), but fail to identify patients at low and intermediate stages of the disease, which remains an issue to be resolved in NB. It has been shown that in NB cell lines and in a total‑spermine oxidase (SMOX) transgenic mouse model, SMOX overexpression induces cellular stress via reactive oxygen species (ROS) imbalance. In this study, we demonstrated that the high expression level of the cytoprotective gene, apoptosis-antagonizing transcription factor (AATF), was driven by SMOX gene overexpression in both NB cells and Total‑SMOX mice. The anti‑apoptotic effect of AATF was supported by analysing the inhibition of the expression of the pro‑apoptotic genes, BAX, BAK and PUMA, which were decreased, in both the in vitro and in vivo SMOX overexpressing model systems investigated. On the whole, this study supports the hypothesis that the SMOX gene can be considered as a novel anti‑apoptotic marker in NB.
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Affiliation(s)
- Emiliano Fratini
- Department of Science, 'Roma Tre' University, I-00146 Rome, Italy
| | - Manuela Cervelli
- Department of Science, 'Roma Tre' University, I-00146 Rome, Italy
| | - Paolo Mariottini
- Department of Science, 'Roma Tre' University, I-00146 Rome, Italy
| | - Yuta Kanamori
- Department of Biochemical Sciences 'A. Rossi Fanelli', 'La Sapienza' University, I-00185 Rome, Italy
| | | | - Enzo Agostinelli
- International Polyamines Foundation - ONLUS, I-00159 Rome, Italy
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10
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Narayanan SP, Shosha E, D Palani C. Spermine oxidase: A promising therapeutic target for neurodegeneration in diabetic retinopathy. Pharmacol Res 2019; 147:104299. [PMID: 31207342 PMCID: PMC7011157 DOI: 10.1016/j.phrs.2019.104299] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/31/2018] [Revised: 04/23/2019] [Accepted: 06/05/2019] [Indexed: 12/20/2022]
Abstract
Diabetic Retinopathy (DR), is a significant public health issue and the leading cause of blindness in working-aged adults worldwide. The vision loss associated with DR affects patients' quality of life and has negative social and psychological effects. In the past, diabetic retinopathy was considered as a vascular disease; however, it is now recognized to be a neuro-vascular disease of the retina. Current therapies for DR, such as laser photocoagulation and anti-VEGF therapy, treat advanced stages of the disease, particularly the vasculopathy and have adverse side effects. Unavailability of effective treatments to prevent the incidence or progression of DR is a major clinical problem. There is a great need for therapeutic interventions capable of preventing retinal damage in DR patients. A growing body of evidence shows that neurodegeneration is an early event in DR pathogenesis. Therefore, studies of the underlying mechanisms that lead to neurodegeneration are essential for identifying new therapeutic targets in the early stages of DR. Deregulation of the polyamine metabolism is implicated in various neurodegenerative diseases, cancer, renal failure, and diabetes. Spermine Oxidase (SMOX) is a highly inducible enzyme, and its dysregulation can alter polyamine homeostasis. The oxidative products of polyamine metabolism are capable of inducing cell damage and death. The current review provides insight into the SMOX-regulated molecular mechanisms of cellular damage and dysfunction, and its potential as a therapeutic target for diabetic retinopathy. Structural and functional changes in the diabetic retina and the mechanisms leading to neuronal damage (excitotoxicity, loss of neurotrophic factors, oxidative stress, mitochondrial dysfunction etc.) are also summarized in this review. Furthermore, existing therapies and new approaches to neuroprotection are discussed.
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Affiliation(s)
- S Priya Narayanan
- Clinical and Experimental Therapeutics, College of Pharmacy, University of Georgia, Augusta, GA, United States; Augusta University Culver Vision Discovery Institute, Augusta, GA, United States; Vascular Biology Center, Augusta University, Augusta, GA, United States; VA Medical Center, Augusta, GA, United States.
| | - Esraa Shosha
- Augusta University Culver Vision Discovery Institute, Augusta, GA, United States; Vascular Biology Center, Augusta University, Augusta, GA, United States; Clinical Pharmacy Department, Faculty of Pharmacy, Cairo University, Cairo, Egypt
| | - Chithra D Palani
- Clinical and Experimental Therapeutics, College of Pharmacy, University of Georgia, Augusta, GA, United States; Augusta University Culver Vision Discovery Institute, Augusta, GA, United States; Vascular Biology Center, Augusta University, Augusta, GA, United States
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11
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Abstract
Polyamines (PAs) are indispensable polycations ubiquitous to all living cells. Among their many critical functions, PAs contribute to the oxidative balance of the cell. Beginning with studies by the Tabor laboratory in bacteria and yeast, the requirement for PAs as protectors against oxygen radical-mediated damage has been well established in many organisms, including mammals. However, PAs also serve as substrates for oxidation reactions that produce hydrogen peroxide (H2O2) both intra- and extracellularly. As intracellular concentrations of PAs can reach millimolar concentrations, the H2O2 amounts produced through their catabolism, coupled with a reduction in protective PAs, are sufficient to cause the oxidative damage associated with many pathologies, including cancer. Thus, the maintenance of intracellular polyamine homeostasis may ultimately contribute to the maintenance of oxidative homeostasis. Again, pioneering studies by Tabor and colleagues led the way in first identifying spermine oxidase in Saccharomyces cerevisiae. They also first purified the extracellular bovine serum amine oxidase and elucidated the products of its oxidation of primary amine groups of PAs when included in culture medium. These investigations formed the foundation for many polyamine-related studies and experimental procedures still performed today. This Minireview will summarize key innovative studies regarding PAs and oxidative damage, starting with those from the Tabor laboratory and including the most recent advances, with a focus on mammalian systems.
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Affiliation(s)
- Tracy Murray Stewart
- From the Sidney Kimmel Comprehensive Cancer Center, The Johns Hopkins University School of Medicine, Baltimore, Maryland 21287 and
| | - Tiffany T Dunston
- From the Sidney Kimmel Comprehensive Cancer Center, The Johns Hopkins University School of Medicine, Baltimore, Maryland 21287 and
| | - Patrick M Woster
- the Department of Drug Discovery and Biomedical Sciences, College of Pharmacy, Medical University of South Carolina, Charleston, South Carolina 29425
| | - Robert A Casero
- From the Sidney Kimmel Comprehensive Cancer Center, The Johns Hopkins University School of Medicine, Baltimore, Maryland 21287 and
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12
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Pietropaoli S, Leonetti A, Cervetto C, Venturini A, Mastrantonio R, Baroli G, Persichini T, Colasanti M, Maura G, Marcoli M, Mariottini P, Cervelli M. Glutamate Excitotoxicity Linked to Spermine Oxidase Overexpression. Mol Neurobiol 2018; 55:7259-7270. [PMID: 29397558 DOI: 10.1007/s12035-017-0864-0] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2017] [Accepted: 12/22/2017] [Indexed: 12/19/2022]
Abstract
Excitotoxic stress has been associated with several different neurological disorders, and it is one of the main causes of neuronal degeneration and death. To identify new potential proteins that could represent key factors in excitotoxic stress and to study the relationship between polyamine catabolism and excitotoxic damage, a novel transgenic mouse line overexpressing spermine oxidase enzyme in the neocortex (Dach-SMOX) has been engineered. These transgenic mice are more susceptible to excitotoxic injury and display a higher oxidative stress, highlighted by 8-Oxo-2'-deoxyguanosine increase and activation of defense mechanisms, as demonstrated by the increase of nuclear factor erythroid 2-related factor 2 (Nrf-2) in the nucleus. In Dach-SMOX astrocytes and neurons, an alteration of the phosphorylated and non-phosphorylated subunits of glutamate receptors increases the kainic acid response in these mice. Moreover, a decrease in excitatory amino acid transporters and an increase in the system xc- transporter, a Nrf-2 target, was observed. Sulfasalazine, a system xc- transporter inhibitor, was shown to revert the increased susceptibility of Dach-SMOX mice treated with kainic acid. We demonstrated that astrocytes play a crucial role in this process: neuronal spermine oxidase overexpression resulted in an alteration of glutamate excitability, in glutamate uptake and efflux in astrocytes involved in the synapse. Considering the involvement of oxidative stress in many neurodegenerative diseases, Dach-SMOX transgenic mouse can be considered as a suitable in vivo genetic model to study the involvement of spermine oxidase in excitotoxicity, which can be considered as a possible therapeutic target.
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Affiliation(s)
- Stefano Pietropaoli
- Department of Sciences, University of Rome "Roma Tre", Viale Marconi 446, 00146, Rome, Italy
| | - Alessia Leonetti
- Department of Sciences, University of Rome "Roma Tre", Viale Marconi 446, 00146, Rome, Italy
| | - Chiara Cervetto
- Section of Pharmacology and Toxicology, Department of Pharmacy, University of Genova, Viale Cembrano 4, 16148, Genoa, Italy
| | - Arianna Venturini
- Section of Pharmacology and Toxicology, Department of Pharmacy, University of Genova, Viale Cembrano 4, 16148, Genoa, Italy
| | - Roberta Mastrantonio
- Department of Sciences, University of Rome "Roma Tre", Viale Marconi 446, 00146, Rome, Italy
| | - Giulia Baroli
- Department of Sciences, University of Rome "Roma Tre", Viale Marconi 446, 00146, Rome, Italy
| | - Tiziana Persichini
- Department of Sciences, University of Rome "Roma Tre", Viale Marconi 446, 00146, Rome, Italy
| | - Marco Colasanti
- Department of Sciences, University of Rome "Roma Tre", Viale Marconi 446, 00146, Rome, Italy
| | - Guido Maura
- Section of Pharmacology and Toxicology, Department of Pharmacy, University of Genova, Viale Cembrano 4, 16148, Genoa, Italy
- Center of Excellence for Biomedical Research, University of Genova, Viale Benedetto XV 5, 16132, Genoa, Italy
| | - Manuela Marcoli
- Section of Pharmacology and Toxicology, Department of Pharmacy, University of Genova, Viale Cembrano 4, 16148, Genoa, Italy
- Center of Excellence for Biomedical Research, University of Genova, Viale Benedetto XV 5, 16132, Genoa, Italy
| | - Paolo Mariottini
- Department of Sciences, University of Rome "Roma Tre", Viale Marconi 446, 00146, Rome, Italy
| | - Manuela Cervelli
- Department of Sciences, University of Rome "Roma Tre", Viale Marconi 446, 00146, Rome, Italy.
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13
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Keinänen TA, Grigorenko N, Khomutov AR, Huang Q, Uimari A, Alhonen L, Hyvönen MT, Vepsäläinen J. Controlling the regioselectivity and stereospecificity of FAD-dependent polyamine oxidases with the use of amine-attached guide molecules as conformational modulators. Biosci Rep 2018; 38:BSR20180527. [PMID: 30006473 PMCID: PMC6131205 DOI: 10.1042/bsr20180527] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2018] [Revised: 07/03/2018] [Accepted: 07/05/2018] [Indexed: 01/03/2023] Open
Abstract
Enzymes generally display strict stereospecificity and regioselectivity for their substrates. Here by using FAD-dependent human acetylpolyamine oxidase (APAO), human spermine (Spm) oxidase (SMOX) and yeast polyamine oxidase (Fms1), we demonstrate that these fundamental properties of the enzymes may be regulated using simple guide molecules, being either covalently attached to polyamines or used as a supplement to the substrate mixtures. APAO, which naturally metabolizes achiral N1-acetylated polyamines, displays aldehyde-controllable stereospecificity with chiral 1-methylated polyamines, like (R)- and (S)-1-methylspermidine (1,8-diamino-5-azanonane) (1-MeSpd). Among the novel N1-acyl derivatives of MeSpd, isonicotinic acid (P4) or benzoic acid (Bz) with (R)-MeSpd had Km of 3.6 ± 0.6/1.2 ± 0.7 µM and kcat of 5.2 ± 0.6/4.6 ± 0.7 s-1 respectively, while N1 -AcSpd had Km 8.2 ± 0.4 µM and kcat 2.7 ± 0.0 s-1 On the contrary, corresponding (S)-MeSpd amides were practically inactive (kcat < 0.03 s-1) but they retained micromole level Km for APAO. SMOX did not metabolize any of the tested compounds (kcat < 0.05 s-1) that acted as non-competitive inhibitors having Ki ≥ 155 µM for SMOX. In addition, we tested (R,R)-1,12-bis-methylspermine (2,13-diamino-5,10-diazatetradecane) (R,R)-(Me2Spm) and (S,S)-Me2Spm as substrates for Fms1. Fms1 preferred (S,S)- to (R,R)-diastereoisomer, but with notably lower kcat in comparison with spermine. Interestingly, Fms1 was prone to aldehyde supplementation in its regioselectivity, i.e. the cleavage site of spermidine. Thus, aldehyde supplementation to generate aldimines or N-terminal substituents in polyamines, i.e. attachment of guide molecule, generates novel ligands with altered charge distribution changing the binding and catalytic properties with polyamine oxidases. This provides means for exploiting hidden capabilities of polyamine oxidases for controlling their regioselectivity and stereospecificity.
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Affiliation(s)
- Tuomo A Keinänen
- School of Pharmacy, Biocenter Kuopio, University of Eastern Finland, Kuopio Campus, P.O. Box 1627, Kuopio FI-70211, Finland
| | - Nikolay Grigorenko
- BASF Schweiz AG, Dispersions and Pigments Division, Klybeckstrasse 141, P.O. Box CH 4002, Basel, Switzerland
| | - Alex R Khomutov
- Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Vavilov St 32, Moscow 119991, Russia
| | - Qingqiu Huang
- MacCHESS at the Cornell High Energy Synchrotron Source, Cornell University Ithaca, NY 14853-8001, U.S.A
| | - Anne Uimari
- Natural Resources Institute Finland, Natural Resources Division, Neulaniementie 5, Kuopio FI-70210, Finland
| | - Leena Alhonen
- School of Pharmacy, Biocenter Kuopio, University of Eastern Finland, Kuopio Campus, P.O. Box 1627, Kuopio FI-70211, Finland
| | - Mervi T Hyvönen
- School of Pharmacy, Biocenter Kuopio, University of Eastern Finland, Kuopio Campus, P.O. Box 1627, Kuopio FI-70211, Finland
| | - Jouko Vepsäläinen
- School of Pharmacy, Biocenter Kuopio, University of Eastern Finland, Kuopio Campus, P.O. Box 1627, Kuopio FI-70211, Finland
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14
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Cervelli M, Leonetti A, Duranti G, Sabatini S, Ceci R, Mariottini P. Skeletal Muscle Pathophysiology: The Emerging Role of Spermine Oxidase and Spermidine. Med Sci (Basel) 2018; 6:medsci6010014. [PMID: 29443878 PMCID: PMC5872171 DOI: 10.3390/medsci6010014] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2017] [Revised: 02/07/2018] [Accepted: 02/09/2018] [Indexed: 12/25/2022] Open
Abstract
Skeletal muscle comprises approximately 40% of the total body mass. Preserving muscle health and function is essential for the entire body in order to counteract chronic diseases such as type II diabetes, cardiovascular diseases, and cancer. Prolonged physical inactivity, particularly among the elderly, causes muscle atrophy, a pathological state with adverse outcomes such as poor quality of life, physical disability, and high mortality. In murine skeletal muscle C2C12 cells, increased expression of the spermine oxidase (SMOX) enzyme has been found during cell differentiation. Notably, SMOX overexpression increases muscle fiber size, while SMOX reduction was enough to induce muscle atrophy in multiple murine models. Of note, the SMOX reaction product spermidine appears to be involved in skeletal muscle atrophy/hypertrophy. It is effective in reactivating autophagy, ameliorating the myopathic defects of collagen VI-null mice. Moreover, spermidine treatment, if combined with exercise, can affect D-gal-induced aging-related skeletal muscle atrophy. This review hypothesizes a role for SMOX during skeletal muscle differentiation and outlines its role and that of spermidine in muscle atrophy. The identification of new molecular pathways involved in the maintenance of skeletal muscle health could be beneficial in developing novel therapeutic lead compounds to treat muscle atrophy.
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Affiliation(s)
- Manuela Cervelli
- Department of Science, Università degli Studi di Roma "Roma Tre", 00146 Rome, Italy.
| | - Alessia Leonetti
- Department of Science, Università degli Studi di Roma "Roma Tre", 00146 Rome, Italy.
| | - Guglielmo Duranti
- Department of of Movement Human and Health Sciences, Unit of Biology, Genetics and Biochemistry, Università degli Studi di Roma "Foro Italico", Piazza Lauro De Bosis 15, 00135 Rome, Italy.
| | - Stefania Sabatini
- Department of of Movement Human and Health Sciences, Unit of Biology, Genetics and Biochemistry, Università degli Studi di Roma "Foro Italico", Piazza Lauro De Bosis 15, 00135 Rome, Italy.
| | - Roberta Ceci
- Department of of Movement Human and Health Sciences, Unit of Biology, Genetics and Biochemistry, Università degli Studi di Roma "Foro Italico", Piazza Lauro De Bosis 15, 00135 Rome, Italy.
| | - Paolo Mariottini
- Department of Science, Università degli Studi di Roma "Roma Tre", 00146 Rome, Italy.
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15
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Ceci R, Duranti G, Leonetti A, Pietropaoli S, Spinozzi F, Marcocci L, Amendola R, Cecconi F, Sabatini S, Mariottini P, Cervelli M. Adaptive responses of heart and skeletal muscle to spermine oxidase overexpression: Evaluation of a new transgenic mouse model. Free Radic Biol Med 2017; 103:216-225. [PMID: 28043891 DOI: 10.1016/j.freeradbiomed.2016.12.040] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/14/2016] [Revised: 12/22/2016] [Accepted: 12/26/2016] [Indexed: 12/16/2022]
Abstract
Spermine oxidase oxidizes spermine to produce H2O2, spermidine, and 3-aminopropanal. It is involved in cell drug response, apoptosis, and in the etiology of several pathologies, including cancer. Spermine oxidase is an important positive regulator of muscle gene expression and fiber size and, when repressed, leads to muscle atrophy. We have generated a transgenic mouse line overexpressing Smox gene in all organs, named Total-Smox. The spermine oxidase overexpression was revealed by β-Gal staining and reverse-transcriptase/PCR analysis, in all tissues analysed. Spermine oxidase activity resulted higher in Total-Smox than controls. Considering the important role of this enzyme in muscle physiology, we have focused our study on skeletal muscle and heart of Total-Smox mice by measuring redox status and oxidative damage. We assessed the redox homeostasis through the analysis of the reduced/oxidized glutathione ratio. Chronic H2O2 production induced by spermine oxidase overexpression leads to a cellular redox state imbalance in both tissues, although they show different redox adaptation. In skeletal muscle, catalase and glutathione S-transferase activities were significantly increased in Total-Smox mice compared to controls. In the heart, no differences were found in CAT activity level, while GST activity decreased compared to controls. The skeletal muscle showed a lower oxidative damage than in the heart, evaluated by lipid peroxidation and protein carbonylation. Altogether, our findings illustrate that skeletal muscle adapts more efficiently than heart to oxidative stress H2O2-induced. The Total-Smox line is a new genetic model useful to deepen our knowledge on the role of spermine oxidase in muscle atrophy and muscular pathological conditions like dystrophy.
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Affiliation(s)
- Roberta Ceci
- Unit of Biology, Genetics and Biochemistry, University of Rome "Foro Italico", Piazza Lauro De Bosis 15, 00135, Rome, Italy
| | - Guglielmo Duranti
- Unit of Biology, Genetics and Biochemistry, University of Rome "Foro Italico", Piazza Lauro De Bosis 15, 00135, Rome, Italy
| | | | | | | | - Lucia Marcocci
- Department of Biochemical Sciences 'A.Rossi Fanelli', La Sapienza University, Rome, Italy
| | | | - Francesco Cecconi
- Department of Biology, University of Rome 'Tor Vergata', 00133, Rome, Italy; Unit of Cell Stress and Survival, Danish Cancer Society Research Center, 2100, Copenhagen, Denmark
| | - Stefania Sabatini
- Unit of Biology, Genetics and Biochemistry, University of Rome "Foro Italico", Piazza Lauro De Bosis 15, 00135, Rome, Italy
| | | | - Manuela Cervelli
- Department of Sciences, Roma Tre Università, 00146, Rome, Italy.
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16
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Murray-Stewart T, Sierra JC, Piazuelo MB, Mera RM, Chaturvedi R, Bravo LE, Correa P, Schneider BG, Wilson KT, Casero RA. Epigenetic silencing of miR-124 prevents spermine oxidase regulation: implications for Helicobacter pylori-induced gastric cancer. Oncogene 2016; 35:5480-5488. [PMID: 27041578 PMCID: PMC5050049 DOI: 10.1038/onc.2016.91] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2015] [Revised: 12/29/2015] [Accepted: 01/04/2016] [Indexed: 01/13/2023]
Abstract
Chronic inflammation contributes to the development of various forms of cancer. The polyamine catabolic enzyme spermine oxidase (SMOX) is induced in chronic inflammatory conditions, including Helicobacter pylori-associated gastritis, where its production of hydrogen peroxide contributes to DNA damage and subsequent tumorigenesis. MicroRNA expression levels are also altered in inflammatory conditions; specifically, the tumor suppressor miR-124 becomes silenced by DNA methylation. We sought to determine if this repression of miR-124 is associated with elevated SMOX activity and concluded that miR-124 is indeed a negative regulator of SMOX. In gastric adenocarcinoma cells harboring highly methylated and silenced mir-124 gene loci, 5-azacytidine treatment allowed miR-124 re-expression and decreased SMOX expression. Overexpression of an exogenous miR-124-3p mimic repressed SMOX mRNA and protein expression as well as H2O2 production by >50% within 24 h. Reporter assays indicated that direct interaction of miR-124 with the 3'-untranslated region of SMOX mRNA contributes to this negative regulation. Importantly, overexpression of miR-124 before infection with H. pylori prevented the induction of SMOX believed to contribute to inflammation-associated tumorigenesis. Compelling human in vivo data from H. pylori-positive gastritis tissues indicated that the mir-124 gene loci are more heavily methylated in a Colombian population characterized by elevated SMOX expression and a high risk for gastric cancer. Furthermore, the degree of mir-124 methylation significantly correlated with SMOX expression throughout the population. These results indicate a protective role for miR-124 through the inhibition of SMOX-mediated DNA damage in the etiology of H. pylori-associated gastric cancer.
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Affiliation(s)
- Tracy Murray-Stewart
- Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University School of Medicine, Baltimore, MD, 21287
| | - Johanna C. Sierra
- Vanderbilt University Medical Center, Division of Gastroenterology, Nashville, TN 37232
| | - M. Blanca Piazuelo
- Vanderbilt University Medical Center, Division of Gastroenterology, Nashville, TN 37232
| | - Robertino M. Mera
- Vanderbilt University Medical Center, Division of Gastroenterology, Nashville, TN 37232
| | - Rupesh Chaturvedi
- Vanderbilt University Medical Center, Division of Gastroenterology, Nashville, TN 37232
- Jawaharlal Nehru University School of Biotechnology, New Delhi-69, India
| | - Luis E. Bravo
- Department of Pathology, Universidad del Valle School of Medicine, Cali, Colombia
| | - Pelayo Correa
- Vanderbilt University Medical Center, Division of Gastroenterology, Nashville, TN 37232
| | - Barbara G. Schneider
- Vanderbilt University Medical Center, Division of Gastroenterology, Nashville, TN 37232
| | - Keith T. Wilson
- Vanderbilt University Medical Center, Division of Gastroenterology, Nashville, TN 37232
- Veterans Affairs Tennessee Valley Healthcare System, Nashville, TN 37212
| | - Robert A. Casero
- Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University School of Medicine, Baltimore, MD, 21287
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17
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Cervelli M, Leonetti A, Cervoni L, Ohkubo S, Xhani M, Stano P, Federico R, Polticelli F, Mariottini P, Agostinelli E. Stability of spermine oxidase to thermal and chemical denaturation: comparison with bovine serum amine oxidase. Amino Acids 2016; 48:2283-91. [PMID: 27295021 DOI: 10.1007/s00726-016-2273-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2016] [Accepted: 06/03/2016] [Indexed: 12/14/2022]
Abstract
Spermine oxidase (SMOX) is a flavin-containing enzyme that specifically oxidizes spermine to produce spermidine, 3-aminopropanaldehyde and hydrogen peroxide. While no crystal structure is available for any mammalian SMOX, X-ray crystallography showed that the yeast Fms1 polyamine oxidase has a dimeric structure. Based on this scenario, we have investigated the quaternary structure of the SMOX protein by native gel electrophoresis, which revealed a composite gel band pattern, suggesting the formation of protein complexes. All high-order protein complexes are sensitive to reducing conditions, showing that disulfide bonds were responsible for protein complexes formation. The major gel band other than the SMOX monomer is the covalent SMOX homodimer, which was disassembled by increasing the reducing conditions, while being resistant to other denaturing conditions. Homodimeric and monomeric SMOXs are catalytically active, as revealed after gel staining for enzymatic activity. An engineered SMOX mutant deprived of all but two cysteine residues was prepared and characterized experimentally, resulting in a monomeric species. High-sensitivity differential scanning calorimetry of SMOX was compared with that of bovine serum amine oxidase, to analyse their thermal stability. Furthermore, enzymatic activity assays and fluorescence spectroscopy were used to gain insight into the unfolding process.
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Affiliation(s)
- Manuela Cervelli
- Department of Sciences, Roma Tre University, V.le Guglielmo Marconi 446, 00146, Rome, Italy
| | - Alessia Leonetti
- Department of Sciences, Roma Tre University, V.le Guglielmo Marconi 446, 00146, Rome, Italy
| | - Laura Cervoni
- Department of Biochemical Sciences "A. Rossi Fanelli", SAPIENZA University of Rome, Piazzale Aldo Moro 5, 00185, Rome, Italy
| | - Shinji Ohkubo
- Department of Biochemical Sciences "A. Rossi Fanelli", SAPIENZA University of Rome, Piazzale Aldo Moro 5, 00185, Rome, Italy
| | - Marla Xhani
- Department of Biochemical Sciences "A. Rossi Fanelli", SAPIENZA University of Rome, Piazzale Aldo Moro 5, 00185, Rome, Italy
| | - Pasquale Stano
- Department of Sciences, Roma Tre University, V.le Guglielmo Marconi 446, 00146, Rome, Italy
| | - Rodolfo Federico
- Department of Sciences, Roma Tre University, V.le Guglielmo Marconi 446, 00146, Rome, Italy
| | - Fabio Polticelli
- Department of Sciences, Roma Tre University, V.le Guglielmo Marconi 446, 00146, Rome, Italy
- National Institute of Nuclear Physics, Roma Tre Section, Via della Vasca Navale 84, 00146, Rome, Italy
| | - Paolo Mariottini
- Department of Sciences, Roma Tre University, V.le Guglielmo Marconi 446, 00146, Rome, Italy
| | - Enzo Agostinelli
- Department of Biochemical Sciences "A. Rossi Fanelli", SAPIENZA University of Rome, Piazzale Aldo Moro 5, 00185, Rome, Italy.
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18
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Triethylenetetramine modulates polyamine and energy metabolism and inhibits cancer cell proliferation. Biochem J 2016; 473:1433-41. [DOI: 10.1042/bcj20160134] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2015] [Accepted: 03/21/2016] [Indexed: 11/17/2022]
Abstract
Copper chelators show anticancer effects by preventing neo-angiogenesis. In the present study, we show that triethylenetetramine (TETA) is a multi-targeting drug, which modulates several key regulatory proteins of polyamine metabolism that contributes to its anticancer effect.
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19
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Mastrantonio R, Cervelli M, Pietropaoli S, Mariottini P, Colasanti M, Persichini T. HIV-Tat Induces the Nrf2/ARE Pathway through NMDA Receptor-Elicited Spermine Oxidase Activation in Human Neuroblastoma Cells. PLoS One 2016; 11:e0149802. [PMID: 26895301 PMCID: PMC4760771 DOI: 10.1371/journal.pone.0149802] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2015] [Accepted: 02/04/2016] [Indexed: 12/05/2022] Open
Abstract
Previously, we reported that HIV-Tat elicits spermine oxidase (SMO) activity upregulation through NMDA receptor (NMDAR) stimulation in human SH-SY5Y neuroblastoma cells, thus increasing ROS generation, which in turn leads to GSH depletion, oxidative stress, and reduced cell viability. In several cell types, ROS can trigger an antioxidant cell response through the transcriptional induction of oxidative stress-responsive genes regulated by the nuclear factor erythroid 2-related factor 2 (Nrf2). Here, we demonstrate that Tat induces both antioxidant gene expression and Nrf2 activation in SH-SY5Y cells, mediated by SMO activity. Furthermore, NMDAR is involved in Tat-induced Nrf2 activation. These findings suggest that the NMDAR/SMO/Nrf2 pathway is an important target for protection against HIV-associated neurocognitive disorders.
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20
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Cervelli M, Polticelli F, Angelucci E, Di Muzio E, Stano P, Mariottini P. Pacific oyster polyamine oxidase: a protein missing link in invertebrate evolution. Amino Acids 2015; 47:949-61. [PMID: 25655384 DOI: 10.1007/s00726-015-1924-2] [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] [Received: 11/12/2014] [Accepted: 01/15/2015] [Indexed: 12/30/2022]
Abstract
Polyamine oxidases catalyse the oxidation of polyamines and acetylpolyamines and are responsible for the polyamine interconversion metabolism in animal cells. Polyamine oxidases from yeast can oxidize spermine, N(1)-acetylspermine, and N(1)-acetylspermidine, while in vertebrates two different enzymes, namely spermine oxidase and acetylpolyamine oxidase, specifically catalyse the oxidation of spermine, and N(1)-acetylspermine/N(1)-acetylspermidine, respectively. In this work we proved that the specialized vertebrate spermine and acetylpolyamine oxidases have arisen from an ancestor invertebrate polyamine oxidase with lower specificity for polyamine substrates, as demonstrated by the enzymatic activity of the mollusc polyamine oxidase characterized here. This is the first report of an invertebrate polyamine oxidase, the Pacific oyster Crassostrea gigas (CgiPAO), overexpressed as a recombinant protein. This enzyme was biochemically characterized and demonstrated to be able to oxidase both N(1)-acetylspermine and spermine, albeit with different efficiency. Circular dichroism analysis gave an estimation of the secondary structure content and modelling of the three-dimensional structure of this protein and docking studies highlighted active site features. The availability of this pluripotent enzyme can have applications in crystallographic studies and pharmaceutical biotechnologies, including anticancer therapy as a source of hydrogen peroxide able to induce cancer cell death.
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Affiliation(s)
- Manuela Cervelli
- Department of Sciences, University of Roma Tre, 00146, Rome, Italy,
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21
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Bonaiuto E, Grancara S, Martinis P, Stringaro A, Colone M, Agostinelli E, Macone A, Stevanato R, Vianello F, Toninello A, Di Paolo ML. A novel enzyme with spermine oxidase properties in bovine liver mitochondria: identification and kinetic characterization. Free Radic Biol Med 2015; 81:88-99. [PMID: 25591967 DOI: 10.1016/j.freeradbiomed.2015.01.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/27/2014] [Revised: 12/19/2014] [Accepted: 01/04/2015] [Indexed: 01/31/2023]
Abstract
The uptake of spermine into mammalian mitochondria indicated the need to identify its catabolic pathway in these organelles. Bovine liver mitochondria were therefore purified and their capacity for natural polyamine uptake was verified. A kinetic approach was then used to determine the presence of an MDL 72527-sensitive enzyme with spermine oxidase activity in the matrix of bovine liver mitochondria. Western blot analysis of mitochondrial fractions and immunogold electron microscopy observations of purified mitochondria unequivocally confirmed the presence of a protein recognized by anti-spermine oxidase antibodies in the mitochondrial matrix. Preliminary kinetic characterization showed that spermine is the preferred substrate of this enzyme; lower activity was detected with spermidine and acetylated polyamines. Catalytic efficiency comparable to that of spermine was also found for 1-aminododecane. The considerable effect of ionic strength on the Vmax/KM ratio suggested the presence of more than one negatively charged zone inside the active site cavity of this mitochondrial enzyme, which is probably involved in the docking of positively charged substrates. These findings indicate that the bovine liver mitochondrial matrix contains an enzyme belonging to the spermine oxidase class. Because H2O2 is generated by spermine oxidase activity, the possible involvement of the latter as an important signaling transducer under both physiological and pathological conditions should be considered.
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Affiliation(s)
- Emanuela Bonaiuto
- Department of Molecular Medicine, University of Padova, Via G. Colombo 3, 35131 Padova, Italy
| | - Silvia Grancara
- Department of Biomedical Sciences, University of Padova, Via G. Colombo 3, 35131 Padova, Italy
| | - Pamela Martinis
- Department of Biomedical Sciences, University of Padova, Via G. Colombo 3, 35131 Padova, Italy
| | - Annarita Stringaro
- Department of Technology and Health, Italian Institute of Health, 00161 Roma, Italy
| | - Marisa Colone
- Department of Technology and Health, Italian Institute of Health, 00161 Roma, Italy
| | - Enzo Agostinelli
- Istituto Pasteur-Fondazione Cenci Bolognetti, Department of Biochemical Sciences "A. Rossi Fanelli," Sapienza University of Rome and Institute of Biology and Molecular Pathology, Italian Research Council, P.le Aldo Moro 5, 00185 Roma, Italy
| | - Alberto Macone
- Istituto Pasteur-Fondazione Cenci Bolognetti, Department of Biochemical Sciences "A. Rossi Fanelli," Sapienza University of Rome and Institute of Biology and Molecular Pathology, Italian Research Council, P.le Aldo Moro 5, 00185 Roma, Italy
| | - Roberto Stevanato
- Department of Molecular Science and Nanosystems, Università Ca' Foscari, Dorsoduro 2137, 30123 Venezia, Italy
| | - Fabio Vianello
- Department of Comparative Biomedicine and Food Science, Polo Agripolis, Viale dell'Università 16, University of Padova, 35020 Legnaro, Italy; Regional Centre for Advanced Technologies and Materials, Department of Physical Chemistry, Palacky University in Olomouc, 17 Listopadu 1192/12, 771 46 Olomouc, Czech Republic
| | - Antonio Toninello
- Department of Biomedical Sciences, University of Padova, Via G. Colombo 3, 35131 Padova, Italy.
| | - Maria Luisa Di Paolo
- Department of Molecular Medicine, University of Padova, Via G. Colombo 3, 35131 Padova, Italy; Consorzio Interuniversitario "Istituto Nazionale Biostrutture e Biosistemi," Viale delle medaglie d'Oro 305, 00136 Roma, Italy.
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22
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Zhu Y, Li J, Kanvinde S, Lin Z, Hazeldine S, Singh R, Oupický D. Self-immolative polycations as gene delivery vectors and prodrugs targeting polyamine metabolism in cancer. Mol Pharm 2015; 12:332-41. [PMID: 25153488 PMCID: PMC4319695 DOI: 10.1021/mp500469n] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2014] [Revised: 08/16/2014] [Accepted: 08/18/2014] [Indexed: 12/15/2022]
Abstract
Polycations are explored as carriers to deliver therapeutic nucleic acids. Polycations are conventionally pharmacological inert with the sole function of delivering therapeutic cargo. This study reports synthesis of a self-immolative polycation (DSS-BEN) based on a polyamine analogue drug N(1),N(11)-bisethylnorspermine (BENSpm). The polycation was designed to function dually as a gene delivery carrier and a prodrug targeting dysregulated polyamine metabolism in cancer. Using a combination of NMR and HPLC, we confirm that the self-immolative polycation undergoes intracellular degradation into the parent drug BENSpm. The released BENSpm depletes cellular levels of spermidine and spermine and upregulates polyamine catabolic enzymes spermine/spermidine N(1)-acetyltransferase (SSAT) and spermine oxidase (SMO). The synthesized polycations form polyplexes with DNA and facilitate efficient transfection. Taking advantage of the ability of BENSpm to sensitize cancer cells to TNFα-induced apoptosis, we show that DSS-BEN enhances the cell killing activity of TNFα gene therapy. The reported findings validate DSS-BEN as a dual-function delivery system that can deliver a therapeutic gene and improve the outcome of gene therapy as a result of the intracellular degradation of DSS-BEN to BENSpm and the subsequent beneficial effect of BENSpm on dysregulated polyamine metabolism in cancer.
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Affiliation(s)
- Yu Zhu
- Center for Drug Delivery and Nanomedicine,
Department of Pharmaceutical
Sciences, and Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha, Nebraska 68198, United States
- Department
of Pharmaceutical Sciences, Wayne State
University, Detroit, Michigan 48202, United
States
| | - Jing Li
- Center for Drug Delivery and Nanomedicine,
Department of Pharmaceutical
Sciences, and Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha, Nebraska 68198, United States
| | - Shrey Kanvinde
- Center for Drug Delivery and Nanomedicine,
Department of Pharmaceutical
Sciences, and Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha, Nebraska 68198, United States
| | - Zhiyi Lin
- Center for Drug Delivery and Nanomedicine,
Department of Pharmaceutical
Sciences, and Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha, Nebraska 68198, United States
| | - Stuart Hazeldine
- Department
of Pharmaceutical Sciences, Wayne State
University, Detroit, Michigan 48202, United
States
| | - Rakesh
K. Singh
- Center for Drug Delivery and Nanomedicine,
Department of Pharmaceutical
Sciences, and Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha, Nebraska 68198, United States
| | - David Oupický
- Center for Drug Delivery and Nanomedicine,
Department of Pharmaceutical
Sciences, and Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha, Nebraska 68198, United States
- Department
of Pharmaceutical Sciences, Wayne State
University, Detroit, Michigan 48202, United
States
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23
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Bongers KS, Fox DK, Kunkel SD, Stebounova LV, Murry DJ, Pufall MA, Ebert SM, Dyle MC, Bullard SA, Dierdorff JM, Adams CM. Spermine oxidase maintains basal skeletal muscle gene expression and fiber size and is strongly repressed by conditions that cause skeletal muscle atrophy. Am J Physiol Endocrinol Metab 2015; 308:E144-58. [PMID: 25406264 PMCID: PMC4297781 DOI: 10.1152/ajpendo.00472.2014] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/14/2014] [Accepted: 11/13/2014] [Indexed: 01/02/2023]
Abstract
Skeletal muscle atrophy is a common and debilitating condition that remains poorly understood at the molecular level. To better understand the mechanisms of muscle atrophy, we used mouse models to search for a skeletal muscle protein that helps to maintain muscle mass and is specifically lost during muscle atrophy. We discovered that diverse causes of muscle atrophy (limb immobilization, fasting, muscle denervation, and aging) strongly reduced expression of the enzyme spermine oxidase. Importantly, a reduction in spermine oxidase was sufficient to induce muscle fiber atrophy. Conversely, forced expression of spermine oxidase increased muscle fiber size in multiple models of muscle atrophy (immobilization, fasting, and denervation). Interestingly, the reduction of spermine oxidase during muscle atrophy was mediated by p21, a protein that is highly induced during muscle atrophy and actively promotes muscle atrophy. In addition, we found that spermine oxidase decreased skeletal muscle mRNAs that promote muscle atrophy (e.g., myogenin) and increased mRNAs that help to maintain muscle mass (e.g., mitofusin-2). Thus, in healthy skeletal muscle, a relatively low level of p21 permits expression of spermine oxidase, which helps to maintain basal muscle gene expression and fiber size; conversely, during conditions that cause muscle atrophy, p21 expression rises, leading to reduced spermine oxidase expression, disruption of basal muscle gene expression, and muscle fiber atrophy. Collectively, these results identify spermine oxidase as an important positive regulator of muscle gene expression and fiber size, and elucidate p21-mediated repression of spermine oxidase as a key step in the pathogenesis of skeletal muscle atrophy.
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Affiliation(s)
- Kale S Bongers
- Departments of Internal Medicine and Molecular Physiology and Biophysics and Fraternal Order of Eagles Diabetes Research Center, Roy J. and Lucille A. Carver College of Medicine
| | - Daniel K Fox
- Departments of Internal Medicine and Molecular Physiology and Biophysics and Fraternal Order of Eagles Diabetes Research Center, Roy J. and Lucille A. Carver College of Medicine
| | - Steven D Kunkel
- Departments of Internal Medicine and Molecular Physiology and Biophysics and Fraternal Order of Eagles Diabetes Research Center, Roy J. and Lucille A. Carver College of Medicine
| | | | - Daryl J Murry
- College of Pharmacy, Roy J. and Lucille A. Carver College of Medicine
| | - Miles A Pufall
- Department of Biochemistry, Roy J. and Lucille A. Carver College of Medicine, The University of Iowa, Iowa City, Iowa, and
| | - Scott M Ebert
- Departments of Internal Medicine and Molecular Physiology and Biophysics and Fraternal Order of Eagles Diabetes Research Center, Roy J. and Lucille A. Carver College of Medicine
| | - Michael C Dyle
- Departments of Internal Medicine and Molecular Physiology and Biophysics and Fraternal Order of Eagles Diabetes Research Center, Roy J. and Lucille A. Carver College of Medicine
| | - Steven A Bullard
- Departments of Internal Medicine and Molecular Physiology and Biophysics and Fraternal Order of Eagles Diabetes Research Center, Roy J. and Lucille A. Carver College of Medicine, Iowa City Veterans Affairs Medical Center, Iowa City, Iowa
| | - Jason M Dierdorff
- Departments of Internal Medicine and Molecular Physiology and Biophysics and Fraternal Order of Eagles Diabetes Research Center, Roy J. and Lucille A. Carver College of Medicine
| | - Christopher M Adams
- Departments of Internal Medicine and Molecular Physiology and Biophysics and Fraternal Order of Eagles Diabetes Research Center, Roy J. and Lucille A. Carver College of Medicine, Iowa City Veterans Affairs Medical Center, Iowa City, Iowa
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24
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Polyamines metabolism and breast cancer: state of the art and perspectives. Breast Cancer Res Treat 2014; 148:233-48. [PMID: 25292420 DOI: 10.1007/s10549-014-3156-7] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2014] [Accepted: 09/30/2014] [Indexed: 12/11/2022]
Abstract
Breast cancer (BC) is a common disease that generally occurs in women over the age of 50, and the risk is especially high for women over 60 years of age. One of the major BC therapeutic problems is that tumors initially responsive to chemotherapeutic approaches can progress to more aggressive forms poorly responsive to therapies. Polyamines (PAs) are small polycationic alkylamines, naturally occurring and essential for normal cell growth and development in eukaryotes. The intracellular concentration of PA is maintained within strongly controlled contents, while a dysregulation occurs in BC cells. Polyamines facilitate the interactions of transcription factors, such as estrogen receptors with their specific response element, and are involved in the proliferation of ER-negative and highly invasive BC tumor cells. Since PA metabolism has a critical role in cell death and proliferation, it represents a potential target for intervention in BC. The goal of this study was to perform a literature search reviewing the association between PA metabolism and BC, and the current evidence supporting the BC treatment targeting PA metabolism. We here describe in vitro and in vivo models, as well as the clinical trials that have been utilized to unveil the relationship between PA metabolism and BC. Polyamine pathway is still an important target for the development of BC chemotherapy via enzyme inhibitors. Furthermore, a recent promising strategy in breast anticancer therapy is to exploit the self-regulatory nature of PA metabolism using PA analogs to affect PA homeostasis. Nowadays, antineoplastic compounds targeting the PA pathway with novel mechanisms are of great interest and high social impact for BC chemotherapy.
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25
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Cervelli M, Angelucci E, Stano P, Leboffe L, Federico R, Antonini G, Mariottini P, Polticelli F. The Glu²¹⁶/Ser²¹⁸ pocket is a major determinant of spermine oxidase substrate specificity. Biochem J 2014; 461:453-9. [PMID: 24854736 DOI: 10.1042/bj20140305] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
SMO (spermine oxidase) and APAO (acetylpolyamine oxidase) are flavoenzymes that play a critical role in the catabolism of polyamines. Polyamines are basic regulators of cell growth and proliferation and their homoeostasis is crucial for cell life since dysregulation of polyamine metabolism has been linked with cancer. In vertebrates SMO specifically catalyses the oxidation of spermine, whereas APAO displays a wider specificity, being able to oxidize both N¹-acetylspermine and N¹-acetylspermidine, but not spermine. The molecular bases of the different substrate specificity of these two enzymes have remained so far elusive. However, previous molecular modelling, site-directed mutagenesis and biochemical characterization studies of the SMO enzyme-substrate complex have identified Glu²¹⁶-Ser²¹⁸ as a putative active site hot spot responsible for SMO substrate specificity. On the basis of these analyses, the SMO double mutants E216L/S218A and E216T/S218A have been produced and characterized by CD spectroscopy and steady-state and rapid kinetics experiments. The results obtained demonstrate that mutation E216L/S218A endows SMO with N¹-acetylspermine oxidase activity, uncovering one of the structural determinants that confer the exquisite and exclusive substrate specificity of SMO for spermine. These results provide the theoretical bases for the design of specific inhibitors either for SMO or APAO.
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Affiliation(s)
| | - Emanuela Angelucci
- *Department of Sciences, Roma Tre University, Viale Guglielmo Marconi 446, I-00146 Rome, Italy
| | - Pasquale Stano
- *Department of Sciences, Roma Tre University, Viale Guglielmo Marconi 446, I-00146 Rome, Italy
| | - Loris Leboffe
- *Department of Sciences, Roma Tre University, Viale Guglielmo Marconi 446, I-00146 Rome, Italy
| | - Rodolfo Federico
- *Department of Sciences, Roma Tre University, Viale Guglielmo Marconi 446, I-00146 Rome, Italy
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26
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Ahou A, Martignago D, Alabdallah O, Tavazza R, Stano P, Macone A, Pivato M, Masi A, Rambla JL, Vera-Sirera F, Angelini R, Federico R, Tavladoraki P. A plant spermine oxidase/dehydrogenase regulated by the proteasome and polyamines. JOURNAL OF EXPERIMENTAL BOTANY 2014; 65:1585-603. [PMID: 24550437 DOI: 10.1093/jxb/eru016] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Polyamine oxidases (PAOs) are flavin-dependent enzymes involved in polyamine catabolism. In Arabidopsis five PAO genes (AtPAO1-AtPAO5) have been identified which present some common characteristics, but also important differences in primary structure, substrate specificity, subcellular localization, and tissue-specific expression pattern, differences which may suggest distinct physiological roles. In the present work, AtPAO5, the only so far uncharacterized AtPAO which is specifically expressed in the vascular system, was partially purified from 35S::AtPAO5-6His Arabidopsis transgenic plants and biochemically characterized. Data presented here allow AtPAO5 to be classified as a spermine dehydrogenase. It is also shown that AtPAO5 oxidizes the polyamines spermine, thermospermine, and N(1)-acetylspermine, the latter being the best in vitro substrate of the recombinant enzyme. AtPAO5 also oxidizes these polyamines in vivo, as was evidenced by analysis of polyamine levels in the 35S::AtPAO5-6His Arabidopsis transgenic plants, as well as in a loss-of-function atpao5 mutant. Furthermore, subcellular localization studies indicate that AtPAO5 is a cytosolic protein undergoing proteasomal control. Positive regulation of AtPAO5 expression by polyamines at the transcriptional and post-transcriptional level is also shown. These data provide new insights into the catalytic properties of the PAO gene family and the complex regulatory network controlling polyamine metabolism.
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Affiliation(s)
- Abdellah Ahou
- Department of Science, University 'ROMA TRE', Rome, Italy
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27
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Cervelli M, Bellavia G, D'Amelio M, Cavallucci V, Moreno S, Berger J, Nardacci R, Marcoli M, Maura G, Piacentini M, Amendola R, Cecconi F, Mariottini P. A New Transgenic Mouse Model for Studying the Neurotoxicity of Spermine Oxidase Dosage in the Response to Excitotoxic Injury. PLoS One 2013; 8:e64810. [PMID: 23840306 PMCID: PMC3686797 DOI: 10.1371/journal.pone.0064810] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2012] [Accepted: 04/18/2013] [Indexed: 11/18/2022] Open
Abstract
Spermine oxidase is a FAD-containing enzyme involved in polyamines catabolism, selectively oxidizing spermine to produce H2O2, spermidine, and 3-aminopropanal. Spermine oxidase is highly expressed in the mouse brain and plays a key role in regulating the levels of spermine, which is involved in protein synthesis, cell division and cell growth. Spermine is normally released by neurons at synaptic sites where it exerts a neuromodulatory function, by specifically interacting with different types of ion channels, and with ionotropic glutamate receptors. In order to get an insight into the neurobiological roles of spermine oxidase and spermine, we have deregulated spermine oxidase gene expression producing and characterizing the transgenic mouse model JoSMOrec, conditionally overexpressing the enzyme in the neocortex. We have investigated the effects of spermine oxidase overexpression in the mouse neocortex by transcript accumulation, immunohistochemical analysis, enzymatic assays and polyamine content in young and aged animals. Transgenic JoSMOrec mice showed in the neocortex a higher H2O2 production in respect to Wild-Type controls, indicating an increase of oxidative stress due to SMO overexpression. Moreover, the response of transgenic mice to excitotoxic brain injury, induced by kainic acid injection, was evaluated by analysing the behavioural phenotype, the immunodistribution of neural cell populations, and the ultrastructural features of neocortical neurons. Spermine oxidase overexpression and the consequently altered polyamine levels in the neocortex affects the cytoarchitecture in the adult and aging brain, as well as after neurotoxic insult. It resulted that the transgenic JoSMOrec mouse line is more sensitive to KA than Wild-Type mice, indicating an important role of spermine oxidase during excitotoxicity. These results provide novel evidences of the complex and critical functions carried out by spermine oxidase and spermine in the mammalian brain.
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Affiliation(s)
| | | | - Marcello D'Amelio
- Laboratory of Molecular Neuroembryology, Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) Fondazione Santa Lucia, Rome, Italy
| | - Virve Cavallucci
- Laboratory of Molecular Neuroembryology, Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) Fondazione Santa Lucia, Rome, Italy
| | - Sandra Moreno
- Dipartimento di Biologia, Università “Roma Tre,” Rome, Italy
| | - Joachim Berger
- Faculty of Medicine, Nursing and Health Sciences, Monash University, Clayton, Australia
| | - Roberta Nardacci
- Istituto Nazionale per le Malattie Infettive, IRCCS “L. Spallanzani,” Rome, Italy
| | - Manuela Marcoli
- Dipartimento di Farmacia, Sez. Farmacologia e Tossicologia, Centro di Eccellenza per la Ricerca Biomedica CEBR, Università di Genova, Genoa, Italy
| | - Guido Maura
- Dipartimento di Farmacia, Sez. Farmacologia e Tossicologia, Centro di Eccellenza per la Ricerca Biomedica CEBR, Università di Genova, Genoa, Italy
| | - Mauro Piacentini
- Istituto Nazionale per le Malattie Infettive, IRCCS “L. Spallanzani,” Rome, Italy
| | - Roberto Amendola
- Agenzia nazionale per le nuove tecnologie, l'energia e lo sviluppo economico sostenibile (ENEA), Il Centro Ricerche Casaccia, Sezione Tossicologia e Scienze Biomediche (BAS-BIOTECMED), Rome, Italy
| | - Francesco Cecconi
- Laboratory of Molecular Neuroembryology, Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) Fondazione Santa Lucia, Rome, Italy
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28
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Cervelli M, Salvi D, Polticelli F, Amendola R, Mariottini P. Structure-function relationships in the evolutionary framework of spermine oxidase. J Mol Evol 2013; 76:365-70. [PMID: 23828398 DOI: 10.1007/s00239-013-9570-3] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2013] [Accepted: 06/20/2013] [Indexed: 01/28/2023]
Abstract
Spermine oxidase is a FAD-dependent enzyme that specifically oxidizes spermine, and plays a central role in the highly regulated catabolism of polyamines in vertebrates. The spermine oxidase substrate is specifically spermine, a tetramine that plays mandatory roles in several cell functions, such as DNA synthesis, cellular proliferation, modulation of ion channels function, cellular signalling, nitric oxide synthesis and inhibition of immune responses. The oxidative products of spermine oxidase activity are spermidine, H2O2 and the aldehyde 3-aminopropanal that spontaneously turns into acrolein. In this study the reconstruction of the phylogenetic relationships among spermine oxidase proteins from different vertebrate taxa allowed to infer their molecular evolutionary history, and assisted in elucidating the conservation of structural and functional properties of this enzyme family. The amino acid residues, which have been hypothesized or demonstrated to play a pivotal role in the enzymatic activity, and substrate specificity are here analysed to obtain a comprehensive and updated view of the structure-function relationships in the evolution of spermine oxidase.
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29
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Polticelli F, Salvi D, Mariottini P, Amendola R, Cervelli M. Molecular evolution of the polyamine oxidase gene family in Metazoa. BMC Evol Biol 2012; 12:90. [PMID: 22716069 PMCID: PMC3517346 DOI: 10.1186/1471-2148-12-90] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2012] [Accepted: 06/14/2012] [Indexed: 12/02/2022] Open
Abstract
BACKGROUND Polyamine oxidase enzymes catalyze the oxidation of polyamines and acetylpolyamines. Since polyamines are basic regulators of cell growth and proliferation, their homeostasis is crucial for cell life. Members of the polyamine oxidase gene family have been identified in a wide variety of animals, including vertebrates, arthropodes, nematodes, placozoa, as well as in plants and fungi. Polyamine oxidases (PAOs) from yeast can oxidize spermine, N1-acetylspermine, and N1-acetylspermidine, however, in vertebrates two different enzymes, namely spermine oxidase (SMO) and acetylpolyamine oxidase (APAO), specifically catalyze the oxidation of spermine, and N1-acetylspermine/N1-acetylspermidine, respectively. Little is known about the molecular evolutionary history of these enzymes. However, since the yeast PAO is able to catalyze the oxidation of both acetylated and non acetylated polyamines, and in vertebrates these functions are addressed by two specialized polyamine oxidase subfamilies (APAO and SMO), it can be hypothesized an ancestral reference for the former enzyme from which the latter would have been derived. RESULTS We analysed 36 SMO, 26 APAO, and 14 PAO homologue protein sequences from 54 taxa including various vertebrates and invertebrates. The analysis of the full-length sequences and the principal domains of vertebrate and invertebrate PAOs yielded consensus primary protein sequences for vertebrate SMOs and APAOs, and invertebrate PAOs. This analysis, coupled to molecular modeling techniques, also unveiled sequence regions that confer specific structural and functional properties, including substrate specificity, by the different PAO subfamilies. Molecular phylogenetic trees revealed a basal position of all the invertebrates PAO enzymes relative to vertebrate SMOs and APAOs. PAOs from insects constitute a monophyletic clade. Two PAO variants sampled in the amphioxus are basal to the dichotomy between two well supported monophyletic clades including, respectively, all the SMOs and APAOs from vertebrates. The two vertebrate monophyletic clades clustered strictly mirroring the organismal phylogeny of fishes, amphibians, reptiles, birds, and mammals. Evidences from comparative genomic analysis, structural evolution and functional divergence in a phylogenetic framework across Metazoa suggested an evolutionary scenario where the ancestor PAO coding sequence, present in invertebrates as an orthologous gene, has been duplicated in the vertebrate branch to originate the paralogous SMO and APAO genes. A further genome evolution event concerns the SMO gene of placental, but not marsupial and monotremate, mammals which increased its functional variation following an alternative splicing (AS) mechanism. CONCLUSIONS In this study the explicit integration in a phylogenomic framework of phylogenetic tree construction, structure prediction, and biochemical function data/prediction, allowed inferring the molecular evolutionary history of the PAO gene family and to disambiguate paralogous genes related by duplication event (SMO and APAO) and orthologous genes related by speciation events (PAOs, SMOs/APAOs). Further, while in vertebrates experimental data corroborate SMO and APAO molecular function predictions, in invertebrates the finding of a supported phylogenetic clusters of insect PAOs and the co-occurrence of two PAO variants in the amphioxus urgently claim the need for future structure-function studies.
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Affiliation(s)
- Fabio Polticelli
- Dipartimento di Biologia, Università “Roma Tre”, I-00146, Rome, Italy
- National Institute of Nuclear Physics, Roma Tre Section, I-00146, Rome, Italy
| | - Daniele Salvi
- CIBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, Campus Agrário de Vairão, 4485-661, Vairão, Portugal
| | - Paolo Mariottini
- Dipartimento di Biologia, Università “Roma Tre”, I-00146, Rome, Italy
| | | | - Manuela Cervelli
- Dipartimento di Biologia, Università “Roma Tre”, I-00146, Rome, Italy
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30
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Cervelli M, Amendola R, Polticelli F, Mariottini P. Spermine oxidase: ten years after. Amino Acids 2012; 42:441-50. [PMID: 21809080 DOI: 10.1007/s00726-011-1014-z] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2011] [Accepted: 05/25/2011] [Indexed: 12/13/2022]
Abstract
Spermine oxidase (SMO) was discovered much more recently than other enzymes involved in polyamine metabolism; this review summarizes 10 years of researches on this enzyme. Spermine oxidase (SMO) is a FAD-dependent enzyme that specifically oxidizes spermine (Spm) and plays a dominant role in the highly regulated mammalian polyamines catabolism. SMO participates in drug response, apoptosis, response to stressful stimuli and etiology of several pathological conditions, including cancer. SMO is a highly inducible enzyme, its deregulation can alter polyamine homeostasis, and dysregulation of polyamine catabolism is often associated with several disease states. The oxidative products of SMO activity are spermidine, and the reactive oxygen species H(2)O(2) and the aldehyde 3-aminopropanal each with the potential to produce cellular damages and pathologies. The SMO substrate Spm is a tetramine that plays mandatory roles in several cell functions, such as DNA synthesis, cellular proliferation, modulation of ion channels function, cellular signaling, nitric oxide synthesis and inhibition of immune responses. The goal of this review is to cover the main biochemical, cellular and physiological processes in which SMO is involved.
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31
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Chaturvedi R, de Sablet T, Peek RM, Wilson KT. Spermine oxidase, a polyamine catabolic enzyme that links Helicobacter pylori CagA and gastric cancer risk. Gut Microbes 2012; 3:48-56. [PMID: 22555547 PMCID: PMC3337125 DOI: 10.4161/gmic.19345] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
We have recently reported that Helicobacter pylori strains expressing the virulence factor cytotoxin-associated gene A (CagA) stimulate increased levels of spermine oxidase (SMO) in gastric epithelial cells, while cagA⁻ strains did not. SMO catabolizes the polyamine spermine and produces H₂O₂ that results in both apoptosis and DNA damage. Exogenous overexpression of CagA confirmed these findings, and knockdown or inhibition of SMO blocked CagA-mediated apoptosis and DNA damage. The strong association of SMO, apoptosis, and DNA damage was also demonstrated in humans infected with cagA⁺, but not cagA⁻ strains. In infected gerbils and mice, DNA damage was CagA-dependent and only present in epithelial cells that expressed SMO. We also discovered SMO (high) gastric epithelial cells from infected animals with dysplasia that are resistant to apoptosis despite high levels of DNA damage. Inhibition of polyamine synthesis or SMO could abrogate the development of this cell population that may represent precursors for neoplastic transformation.
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Affiliation(s)
- Rupesh Chaturvedi
- Division of Gastroenterology, Hepatology, and Nutrition; Department of Medicine; Vanderbilt University Medical Center; Nashville, TN USA
- Veterans Affairs; Tennessee Valley Healthcare System; Nashville, TN USA
| | - Thibaut de Sablet
- Division of Gastroenterology, Hepatology, and Nutrition; Department of Medicine; Vanderbilt University Medical Center; Nashville, TN USA
- Veterans Affairs; Tennessee Valley Healthcare System; Nashville, TN USA
| | - Richard M. Peek
- Division of Gastroenterology, Hepatology, and Nutrition; Department of Medicine; Vanderbilt University Medical Center; Nashville, TN USA
- Veterans Affairs; Tennessee Valley Healthcare System; Nashville, TN USA
- Department of Cancer Biology; Vanderbilt University Medical Center; Nashville, TN USA
| | - Keith T. Wilson
- Division of Gastroenterology, Hepatology, and Nutrition; Department of Medicine; Vanderbilt University Medical Center; Nashville, TN USA
- Veterans Affairs; Tennessee Valley Healthcare System; Nashville, TN USA
- Department of Cancer Biology; Vanderbilt University Medical Center; Nashville, TN USA
- Department of Pathology, Microbiology, and Immunology; Vanderbilt University Medical Center; Nashville, TN USA
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Goodwin AC, Shields CED, Wu S, Huso DL, Wu X, Murray-Stewart TR, Hacker-Prietz A, Rabizadeh S, Woster PM, Sears CL, Casero RA. Polyamine catabolism contributes to enterotoxigenic Bacteroides fragilis-induced colon tumorigenesis. Proc Natl Acad Sci U S A 2011; 108:15354-9. [PMID: 21876161 PMCID: PMC3174648 DOI: 10.1073/pnas.1010203108] [Citation(s) in RCA: 385] [Impact Index Per Article: 29.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
It is estimated that the etiology of 20-30% of epithelial cancers is directly associated with inflammation, although the direct molecular events linking inflammation and carcinogenesis are poorly defined. In the context of gastrointestinal disease, the bacterium enterotoxigenic Bacteroides fragilis (ETBF) is a significant source of chronic inflammation and has been implicated as a risk factor for colorectal cancer. Spermine oxidase (SMO) is a polyamine catabolic enzyme that is highly inducible by inflammatory stimuli resulting in increased reactive oxygen species (ROS) and DNA damage. We now demonstrate that purified B. fragilis toxin (BFT) up-regulates SMO in HT29/c1 and T84 colonic epithelial cells, resulting in SMO-dependent generation of ROS and induction of γ-H2A.x, a marker of DNA damage. Further, ETBF-induced colitis in C57BL/6 mice is associated with increased SMO expression and treatment of mice with an inhibitor of polyamine catabolism, N(1),N(4)-bis(2,3-butandienyl)-1,4-butanediamine (MDL 72527), significantly reduces ETBF-induced chronic inflammation and proliferation. Most importantly, in the multiple intestinal neoplasia (Min) mouse model, treatment with MDL 72527 reduces ETBF-induced colon tumorigenesis by 69% (P < 0.001). The results of these studies indicate that SMO is a source of bacteria-induced ROS directly associated with tumorigenesis and could serve as a unique target for chemoprevention.
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Affiliation(s)
| | | | | | | | | | | | | | - Shervin Rabizadeh
- Pediatrics and The Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins School of Medicine, Baltimore, MD 21231; and
| | - Patrick M. Woster
- Department of Pharmaceutical and Biomedical Sciences, Medical Univeristy of South Carolina, Charleston, SC 29425
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Polyamine catabolism: target for antiproliferative therapies in animals and stress tolerance strategies in plants. Amino Acids 2011; 42:411-26. [DOI: 10.1007/s00726-011-1012-1] [Citation(s) in RCA: 108] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2011] [Accepted: 05/28/2011] [Indexed: 12/27/2022]
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Tavladoraki P, Cervelli M, Antonangeli F, Minervini G, Stano P, Federico R, Mariottini P, Polticelli F. Probing mammalian spermine oxidase enzyme-substrate complex through molecular modeling, site-directed mutagenesis and biochemical characterization. Amino Acids 2011; 40:1115-26. [PMID: 20839014 DOI: 10.1007/s00726-010-0735-8] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2010] [Accepted: 08/26/2010] [Indexed: 10/19/2022]
Abstract
Spermine oxidase (SMO) and acetylpolyamine oxidase (APAO) are FAD-dependent enzymes that are involved in the highly regulated pathways of polyamine biosynthesis and degradation. Polyamine content is strictly related to cell growth, and dysfunctions in polyamine metabolism have been linked with cancer. Specific inhibitors of SMO and APAO would allow analyzing the precise role of these enzymes in polyamine metabolism and related pathologies. However, none of the available polyamine oxidase inhibitors displays the desired characteristics of selective affinity and specificity. In addition, repeated efforts to obtain structural details at the atomic level on these two enzymes have all failed. In the present study, in an effort to better understand structure-function relationships, SMO enzyme-substrate complex has been probed through a combination of molecular modeling, site-directed mutagenesis and biochemical studies. Results obtained indicate that SMO binds spermine in a similar conformation as that observed in the yeast polyamine oxidase FMS1-spermine complex and demonstrate a major role for residues His82 and Lys367 in substrate binding and catalysis. In addition, the SMO enzyme-substrate complex highlights the presence of an active site pocket with highly polar characteristics, which may explain the different substrate specificity of SMO with respect to APAO and provide the basis for the design of specific inhibitors for SMO and APAO.
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Affiliation(s)
- Paraskevi Tavladoraki
- Department of Biology, University Roma Tre, Viale Guglielmo Marconi 446, 00146, Rome, Italy
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Cervelli M, Bellavia G, Fratini E, Amendola R, Polticelli F, Barba M, Federico R, Signore F, Gucciardo G, Grillo R, Woster PM, Casero RA, Mariottini P. Spermine oxidase (SMO) activity in breast tumor tissues and biochemical analysis of the anticancer spermine analogues BENSpm and CPENSpm. BMC Cancer 2010; 10:555. [PMID: 20946629 PMCID: PMC3027604 DOI: 10.1186/1471-2407-10-555] [Citation(s) in RCA: 38] [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: 02/10/2010] [Accepted: 10/14/2010] [Indexed: 11/26/2022] Open
Abstract
BACKGROUND Polyamine metabolism has a critical role in cell death and proliferation representing a potential target for intervention in breast cancer (BC). This study investigates the expression of spermine oxidase (SMO) and its prognostic significance in BC. Biochemical analysis of Spm analogues BENSpm and CPENSpm, utilized in anticancer therapy, was also carried out to test their property in silico and in vitro on the recombinant SMO enzyme. METHODS BC tissue samples were analyzed for SMO transcript level and SMO activity. Student's t test was applied to evaluate the significance of the differences in value observed in T and NT samples. The structure modeling analysis of BENSpm and CPENSpm complexes formed with the SMO enzyme and their inhibitory activity, assayed by in vitro experiments, were examined. RESULTS Both the expression level of SMO mRNA and SMO enzyme activity were significantly lower in BC samples compared to NT samples. The modeling of BENSpm and CPENSpm complexes formed with SMO and their inhibition properties showed that both were good inhibitors. CONCLUSIONS This study shows that underexpression of SMO is a negative marker in BC. The SMO induction is a remarkable chemotherapeutical target. The BENSpm and CPENSpm are efficient SMO inhibitors. The inhibition properties shown by these analogues could explain their poor positive outcomes in Phases I and II of clinical trials.
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Affiliation(s)
| | | | - Emiliano Fratini
- Dipartimento di Biologia, Università Roma Tre, Rome, Italy
- Dipartimento BAS-BiotecMed, ENEA, CR Casaccia, Rome, Italy
| | | | | | - Marco Barba
- Dipartimento di Biologia, Università Roma Tre, Rome, Italy
| | | | - Fabrizio Signore
- Department of Gynaecology, Breast Surgery and Pathology, San Camillo-Forlanini Hospital, Rome, Italy
| | - Giacomo Gucciardo
- Department of Gynaecology, Breast Surgery and Pathology, San Camillo-Forlanini Hospital, Rome, Italy
| | - Rosalba Grillo
- Department of Gynaecology, Breast Surgery and Pathology, San Camillo-Forlanini Hospital, Rome, Italy
| | - Patrick M Woster
- Department of Pharmaceutical Sciences, Wayne State University, Detroit, MI 48202, USA
| | - Robert A Casero
- The Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, The Johns Hopkins University School of Medicine, Baltimore, MD 21231, USA
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Fiori LM, Turecki G. Genetic and epigenetic influences on expression of spermine synthase and spermine oxidase in suicide completers. Int J Neuropsychopharmacol 2010; 13:725-36. [PMID: 20059804 DOI: 10.1017/s1461145709991167] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Alterations in the levels of spermine synthase (SMS) and spermine oxidase (SMOX), two enzymes involved in polyamine metabolism, have previously been observed in brains of suicide completers. To characterize the roles played by genetic and epigenetic factors in determining expression levels of these genes, as well as to identify potential mechanisms by which to explain our findings in suicide completers, we (1) assessed the role of promoter polymorphisms in determining expression in the brain and in vitro, and (2) examined CpG methylation and levels of methylated histone H3 lysine-27 in the promoter regions of these genes in the prefrontal cortex of suicide completers and healthy controls. We identified several promoter haplotypes in SMS and SMOX, but found no consistent effects of haplotype on expression levels in either the brain or in reporter gene assays performed in three different cell lines. We also found no overall effects of epigenetic factors in determining expression, with the exception of a relationship between CpG methylation at one site in the promoter of SMOX and its expression in Brodmann area 8/9. In conclusion, the genetic and epigenetic factors examined in this study show little influence on the expression levels of SMS and SMOX, and do not appear to be responsible for the dysregulated expression of these genes in suicide completers.
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Affiliation(s)
- Laura M Fiori
- McGill Group for Suicide Studies, Douglas Mental Health University Institute, McGill University, Montreal, Quebec, Canada
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Cervelli M, Fratini E, Amendola R, Bianchi M, Signori E, Ferraro E, Lisi A, Federico R, Marcocci L, Mariottini P. Increased spermine oxidase (SMO) activity as a novel differentiation marker of myogenic C2C12 cells. Int J Biochem Cell Biol 2009; 41:934-44. [PMID: 18852063 DOI: 10.1016/j.biocel.2008.09.009] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2008] [Revised: 09/11/2008] [Accepted: 09/12/2008] [Indexed: 12/16/2022]
Abstract
Spermine oxidase (SMO) is a FAD-containing enzyme involved in animal cell polyamines (PA) homeostasis, selectively active on spermine and producing H(2)O(2), spermidine, and the 3-aminopropanal. In the present study, we have examined the SMO gene expression during the mouse myoblast C2C12 cell differentiation induced with two different stimuli by RT-PCR analysis, polysome-mRNP distribution and enzyme activity. SMO transcript accumulation and enzymatic activity increases during C2C12 cell differentiation and correlates with the decrease of spermine content. Many proteins are highly regulated during the phenotypic conversion of rapidly dividing C2C12 myoblasts into fully differentiated post-mitotic myotubes. The SMO gene induction represents a novel and additional marker of C2C12 cell differentiation. The sub-cellular localization of the SMOalpha and SMOmu splice variants is not involved in the differentiation processes. Nuclear localization of only the SMOmu protein was confirmed.
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38
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Murray-Stewart T, Wang Y, Goodwin A, Hacker A, Meeker A, Casero RA. Nuclear localization of human spermine oxidase isoforms - possible implications in drug response and disease etiology. FEBS J 2008; 275:2795-806. [PMID: 18422650 PMCID: PMC3631774 DOI: 10.1111/j.1742-4658.2008.06419.x] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
The recent discovery of the direct oxidation of spermine via spermine oxidase (SMO) as a mechanism through which specific antitumor polyamine analogues exert their cytotoxic effects has fueled interest in the study of the polyamine catabolic pathway. A major byproduct of spermine oxidation is H2O2, a source of toxic reactive oxygen species. Recent targeted small interfering RNA studies have confirmed that SMO-produced reactive oxygen species are directly responsible for oxidative stress capable of inducing apoptosis and potentially mutagenic DNA damage. In the present study, we describe a second catalytically active splice variant protein of the human spermine oxidase gene, designated SMO5, which exhibits substrate specificities and affinities comparable to those of the originally identified human spermine oxidase-1, SMO/PAOh1, and, as such, is an additional source of H2O2. Importantly, overexpression of either of these SMO isoforms in NCI-H157 human non-small cell lung carcinoma cells resulted in significant localization of SMO protein in the nucleus, as determined by confocal microscopy. Furthermore, cell lines overexpressing either SMO/PAOh1 or SMO5 demonstrated increased spermine oxidation in the nucleus, with accompanying alterations in individual nuclear polyamine concentrations. This increased oxidation of spermine in the nucleus therefore increases the production of highly reactive H2O2 in close proximity to DNA, as well as decreases nuclear spermine levels, thus altering the protective roles of spermine in free radical scavenging and DNA shielding, and resulting in an overall increased potential for oxidative DNA damage in these cells. The results of these studies therefore have considerable significance both with respect to targeting polyamine oxidation as an antineoplastic strategy, and in regard to the potential role of spermine oxidase in inflammation-induced carcinogenesis.
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Affiliation(s)
- Tracy Murray-Stewart
- Department of Oncology, Johns Hopkins University School of Medicine and the Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, Baltimore, MD 21231, USA
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39
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Bianchi M, Bellini A, Cervelli M, Degan P, Marcocci L, Martini F, Scatteia M, Mariottini P, Amendola R. Chronic sub-lethal oxidative stress by spermine oxidase overactivity induces continuous DNA repair and hypersensitivity to radiation exposure. BIOCHIMICA ET BIOPHYSICA ACTA 2007; 1773:774-83. [PMID: 17363080 DOI: 10.1016/j.bbamcr.2007.01.014] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2006] [Revised: 01/29/2007] [Accepted: 01/29/2007] [Indexed: 12/22/2022]
Abstract
In the aging process and in most degenerative diseases, the oxidant by-products of cellular metabolism lead to oxidative stress. Oxidative stress plays an important role in switching from cell proliferation to its opposite outcome, cell death. The metabolic pathways in charge of the interconversion and degradation of the polyamines are responsible for oxidant by-products. In the past few years, spermine metabolism has been found closely related to DNA oxidation and apoptosis. Moreover, that the ectopical expression of murine spermine oxidase induced DNA damage in the neuroblastoma cell line, and this was uncoupled with any increase in cell mortality, thus suggests an activation of DNA repair. In this work, we provide new evidence showing that only spermine oxidase overactivity can deliver sub-lethal chronic DNA damage and repair without affecting transcriptional and enzymatic levels of the PA key regulatory enzymes ODC and SSAT. Chronic sub-lethal DNA damage is below the cell cycle arrest induction threshold, but is able to activate apurinic/apyrimidinic endonuclease protein (APE1) and gamma H2AX. Of therapeutic interest, the chronic sub-lethal DNA damage and activation of the repair processes are in turn responsible for inducing hypersensitivity after exposure to radiation with no induction of adaptive response to damage.
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Affiliation(s)
- M Bianchi
- ENEA, ION IRP, CR Casaccia, Via Anguillarese 301, 00060 Roma, Italy
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40
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Wood PL, Khan MA, Moskal JR. The concept of "aldehyde load" in neurodegenerative mechanisms: cytotoxicity of the polyamine degradation products hydrogen peroxide, acrolein, 3-aminopropanal, 3-acetamidopropanal and 4-aminobutanal in a retinal ganglion cell line. Brain Res 2007; 1145:150-6. [PMID: 17362887 DOI: 10.1016/j.brainres.2006.10.004] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2006] [Revised: 10/02/2006] [Accepted: 10/03/2006] [Indexed: 11/21/2022]
Abstract
In neurodegenerative diseases augmented polyamine metabolism results in the generation of hydrogen peroxide and a number of reactive aldehydes that participate in the death of compromised tissue. The major aldehydes produced by polyamine oxidase and amine oxidases include the 2-alkenal acrolein, the acetoamidoaldehyde 3-acetamidopropanal (3-AAP) and the aminoaldehydes 3-aminopropanal (3-AP) and 4-aminobutanal (4-AB). Using retinal ganglion cell (E1A-NR.3) cultures, we confirmed the cytotoxicity of acrolein and 3-AP. For the first time we also demonstrated the cytotoxicity of 4-AB and the lack of toxicity of 3-AAP. Our data with 3-AAP, a product of N-acetylspermine and N-acetylspermidine metabolism, indicate that the aldehyde function of aminoaldehydes is insufficient to express toxicity since the free amino group of aminoaldehydes is also required to gain access to lysosomes where their cytotoxic actions are expressed via leakage of cathepsins that compromise mitochondrial integrity. Metabolism of 3-AP to beta-alanine by aldehyde dehydrogenase was also evaluated in retinal ganglion cell cultures and found to proceed at a linear rate of 24.3+/-1 nmol/mg protein/h. These are the first data demonstrating the dynamic cellular detoxification of 3-AP by neural cells and support the concept that decrements in aldehyde elimination leading to an increase in "aldehyde load" may play pivotal roles in the development and progression of neurodegenerative diseases such as Alzheimer's disease, multiple sclerosis and Parkinson's disease.
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Affiliation(s)
- Paul L Wood
- The Falk Center for Molecular Therapeutics, Dept. of Biomedical Engineering, McCormick School of Engineering and Applied Sciences, Northwestern University, 1801 Maple Ave., Suite 4306, Evanston, IL 60201, USA.
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41
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Wang Y, Casero RA. Mammalian polyamine catabolism: a therapeutic target, a pathological problem, or both? J Biochem 2007; 139:17-25. [PMID: 16428315 DOI: 10.1093/jb/mvj021] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
With the recent discovery of the polyamine catabolic enzyme spermine oxidase (SMO/PAOh1), the apparent complexity of the polyamine metabolic pathway has increased considerably. Alone or in combination with the two other known members of human polyamine catabolism, spermidine/spermine N(1)-acetyltransferase, and N(1)-acetylpolyamine oxidase (PAO), SMO/PAOh1 expression has the potential to alter polyamine homeostasis in response to normal cellular signals, drug treatment and environmental and/or cellular stressors. The activity of the oxidases producing toxic aldehydes and the reactive oxygen species (ROS) H(2)O(2), suggest a mechanism by which these oxidases can be exploited as an antineoplastic drug target. However, inappropriate activation of the pathways may also lead to pathological outcomes, including DNA damage that can lead to cellular transformation. The most recent data suggest that the two polyamine catabolic pathways exhibit distinct properties and understanding these properties should aid in their exploitation for therapeutic and/or chemopreventive strategies.
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Affiliation(s)
- Yanlin Wang
- Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins University, Baltimore, Maryland, 21231, USA
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42
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Bianchi M, Polticelli F, Ascenzi P, Botta M, Federico R, Mariottini P, Cona A. Inhibition of polyamine and spermine oxidases by polyamine analogues. FEBS J 2006; 273:1115-23. [PMID: 16519678 DOI: 10.1111/j.1742-4658.2006.05137.x] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Polyamine oxidase (PAO) and spermine oxidase (SMO) are involved in the catabolism of polyamines--basic regulators of cell growth and proliferation. The discovery of selective inhibitors of PAO and SMO represents an important tool in studying the involvement of these enzymes in polyamine homeostasis and a starting point for the development of novel antineoplastic drugs. Here, a comparative study on murine PAO (mPAO) and SMO (mSMO) inhibition by the polyamine analogues 1,8-diaminooctane, 1,12-diaminododecane, N-prenylagmatine (G3), guazatine and N,N1-bis(2,3-butadienyl)-1,4-butanediamine (MDL72527) is reported. Interestingly, 1,12-Diaminododecane and G3 behave as specific inhibitors of mPAO, values of K(i) for mPAO inhibition being lower than those for mSMO inactivation by several orders of magnitude. The analysis of molecular models of mPAO and mSMO indicates a significant reduction of the hydrophobic pocket located in maize PAO (MPAO) at the wider catalytic tunnel opening. This observation provides a rationale to explain the lower affinity displayed by G3, guazatine and MDL72527 for mPAO and mSMO as compared to MPAO. The different behaviour displayed by 1,12-diaminododecane towards mPAO and mSMO reveals the occurrence of basic differences in the ligand binding mode of the two enzymes, the first enzyme interacting mainly with substrate secondary amino groups and the second one with substrate primary amino groups. Thus, the data reported here provide the basis for the development of novel and selective inhibitors able to discriminate between mammalian SMO and PAO activities.
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43
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Cona A, Rea G, Angelini R, Federico R, Tavladoraki P. Functions of amine oxidases in plant development and defence. TRENDS IN PLANT SCIENCE 2006; 11:80-8. [PMID: 16406305 DOI: 10.1016/j.tplants.2005.12.009] [Citation(s) in RCA: 365] [Impact Index Per Article: 20.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2005] [Revised: 11/17/2005] [Accepted: 12/21/2005] [Indexed: 05/06/2023]
Abstract
Copper amine oxidases and flavin-containing amine oxidases catalyse the oxidative de-amination of polyamines, which are ubiquitous compounds essential for cell growth and proliferation. Far from being only a means of degrading cellular polyamines and, thus, contributing to polyamine homeostasis, amine oxidases participate in important physiological processes through their reaction products. In plants, the production of hydrogen peroxide (H(2)O(2)) deriving from polyamine oxidation has been correlated with cell wall maturation and lignification during development as well as with wound-healing and cell wall reinforcement during pathogen invasion. As a signal molecule, H(2)O(2) derived from polyamine oxidation mediates cell death, the hypersensitive response and the expression of defence genes. Furthermore, aminoaldehydes and 1,3-diaminopropane from polyamine oxidation are involved in secondary metabolite synthesis and abiotic stress tolerance.
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Affiliation(s)
- Alessandra Cona
- Dipartimento di Biologia, Università degli Studi "Roma Tre", Viale G. Marconi 446, 00146 Rome, Italy
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44
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Toninello A, Pietrangeli P, De Marchi U, Salvi M, Mondovì B. Amine oxidases in apoptosis and cancer. BIOCHIMICA ET BIOPHYSICA ACTA 2006; 1765:1-13. [PMID: 16225993 DOI: 10.1016/j.bbcan.2005.09.001] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2004] [Revised: 09/12/2005] [Accepted: 09/13/2005] [Indexed: 02/02/2023]
Abstract
Amine oxidases, the major enzymes of biogenic amines metabolism, are considered to be biological regulators, especially for cell growth and differentiation. A primary involvement of amine oxidases in cancer growth inhibition and progression, especially by means of aldehydes, H(2)O(2) and other reactive oxygen species, the amine oxidase-mediated products of biogenic amines oxidation, has been demonstrated. Amine oxidases are involved in cancer growth inhibition because of the higher content in tumour cells of biogenic amines in comparison to normal cells. The cytotoxic effect can be explained by a damage to cell membranes and/or nuclei or, indirectly, through modulation of membrane permeability transition and therefore apoptosis. The oxidation products of biogenic amines appears to be also carcinogenic, while acrolein, produced from the oxidation of spermine and spermidine, should be a key compound both carcinogenic and cytotoxic. The cancer inhibition/promotion effect of amine oxidases could be explained by taking into consideration the full pattern of the enzyme content of the cell. The balance of amine oxidases and antioxidant enzymes appear to be a crucial point for cancer inhibition or progression. A long lasting imbalance of these enzymes appears to be carcinogenic, while, for a short time, amine oxidases are cytotoxic for cancer cells.
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Affiliation(s)
- Antonio Toninello
- Department of Biological Chemistry University of Padua and C.N.R. Institute of Neuroscience, Unit for the Study of Biomembranes, Viale G. Colombo 3, 35121 Padua, Italy
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45
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Wang Y, Hacker A, Murray-Stewart T, Frydman B, Valasinas A, Fraser AV, Woster PM, Casero RA. Properties of recombinant human N1-acetylpolyamine oxidase (hPAO): potential role in determining drug sensitivity. Cancer Chemother Pharmacol 2005; 56:83-90. [PMID: 15791459 DOI: 10.1007/s00280-004-0936-5] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2004] [Accepted: 10/08/2004] [Indexed: 11/26/2022]
Abstract
The recent cloning of the mammalian gene coding for N(1)-acetylpolyamine oxidase (PAO) provides the opportunity to directly examine the role of human PAO (hPAO) in polyamine homeostasis as well as its potential role in determining cellular response to antitumor polyamine analogues. To facilitate the study of this enzyme, the production, purification, and characterization of the recombinant hPAO is reported. hPAO oxidizes N(1)-acetylspermidine (K(m)=2.1 microM, K(cat)=15.0 s(-1)) and has very high affinity for N(1)-acetylspermine (K(m)=0.85 microM, K(cat)=31.7 s(-1)). The recombinant hPAO does not efficiently oxidize spermine, thereby demonstrating a significant difference in substrate specificity from the previously described human spermine oxidase PAOh1/SMO. Importantly, hPAO demonstrates the ability to oxidize a subset of antitumor polyamine analogues, suggesting that this oxidase activity could have a significant effect on determining tumor sensitivity to these or similar agents. Transfection of A549 human lung cancer cells with an hPAO-expressing plasmid leads to a profound decrease in sensitivity to those analogues which act as substrates, confirming its potential to alter drug response. One similarity that hPAO shares with human PAOh1/SMO, is that certain oligoamine analogues are potent inhibitors of its oxidase activity. The results of these studies demonstrate how changes in polyamine catabolism may affect drug response.
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Affiliation(s)
- Yanlin Wang
- The Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University School of Medicine, Baltimore, MD 21231, USA
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Bianchi M, Amendola R, Federico R, Polticelli F, Mariottini P. Two short protein domains are responsible for the nuclear localization of the mouse spermine oxidase mu isoform. FEBS J 2005; 272:3052-9. [PMID: 15955064 DOI: 10.1111/j.1742-4658.2005.04718.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In mouse, at least two catalytically active splice variants (mSMOalpha and mSMOmicro) of the flavin-containing spermine oxidase enzyme are present. We have demonstrated previously that the cytosolic mSMOalpha is the major isoform, while the mSMOmicro enzyme is present in both nuclear and cytoplasmic compartments and has an extra protein domain corresponding to the additional exon VIa. By amino acid sequence comparison and molecular modeling of mSMO proteins, we identified a second domain that is necessary for nuclear localization of the mSMOmicro splice variant. A deletion mutant enzyme of this region was constructed to demonstrate its role in protein nuclear targeting by means of transient expression in the murine neuroblastoma cell line, N18TG2.
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Affiliation(s)
- Marzia Bianchi
- Dipartimento di Biologia, Università Roma Tre, Roma, Italy
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Amendola R, Bellini A, Cervelli M, Degan P, Marcocci L, Martini F, Mariottini P. Direct oxidative DNA damage, apoptosis and radio sensitivity by spermine oxidase activities in mouse neuroblastoma cells. BIOCHIMICA ET BIOPHYSICA ACTA 2005; 1755:15-24. [PMID: 15907589 DOI: 10.1016/j.bbcan.2005.02.002] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2004] [Revised: 01/27/2005] [Accepted: 02/16/2005] [Indexed: 11/15/2022]
Abstract
In mammals, the polyamines affect cell growth, differentiation, and apoptosis; their levels are increased in malignant and proliferating cells, thus justifying an interest in a chemotherapeutic approach to cancer. The flavoprotein SMO is the most recently characterized catabolic enzyme, preferentially oxidizing SPM to SPD, 3-aminopropanal and H(2)O(2). In this report, we describe a novel functional characterization of the recently cloned splice variant isoforms from mouse brain, encoding, among others, the nuclear co-localized spermine oxidase mSMOmu. The over-expression of the active isoforms mSMOalpha and mSMOmu, and the inactive mSMOdelta and mSMOgamma in mouse neuroblastoma cells, demonstrated the first evidence of the direct oxidative DNA damage by the SMO activities, either alone or, in a higher extent, when associated with radiation exposure, thus working as radio sensitizer. These effects were reverted by treatment with 50 muM and 100 muM doses of the inhibitor of SMO activity MDL 72,527. The over-expression of all SMO isoforms failed to influence the expression of the regulating enzymes of polyamines metabolism ODC and SSAT. Dealing with the unbalanced tissue specific SMO activities, these results could indicate a new direction to tailor chemotherapy-associated radiotherapy, improving dose-rate protocol and allowing the modulation of deleterious side effects on healthy tissues.
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Affiliation(s)
- R Amendola
- Istituto per la Radioprotezione, ENEA, CR Casaccia, Via Anguillarese 301, 00060 Rome, Italy.
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Abstract
The natural polyamines are aliphatic cations with multiple functions and are essential for cell growth. Soon after the critical requirement of polyamines for cell proliferation was recognized, the metabolism of polyamines was pursued as a target for antineoplastic therapy. Initially, much attention was focused on the development of inhibitors of polyamine biosynthesis as a means to inhibit tumor growth. The best-characterized inhibitor is alpha-difluoromethylornithine (DFMO), an irreversible inhibitor of ornithine decarboxylase. While compensatory mechanisms in polyamine metabolism reduce the effectiveness of DFMO as a single chemotherapeutic agent, it is currently undergoing extensive testing and clinical trials for chemoprevention and other diseases. There has been increasing interest over the last two decades in the cytotoxic response to agents that target the regulation of polyamine metabolism rather than directly inhibiting the metabolic enzymes in tumor cells. This interest resulted in the development of a number of polyamine analogs that exhibit effective cytotoxicity against tumor growth in preclinical models. The analogs enter cells through a selective polyamine transport system and can be either polyamine antimetabolites that deplete the intracellular polyamines or polyamine mimetics that displace the natural polyamines from binding sites, but do not substitute in terms of growth-promoting function. Synthesis of the first generation of symmetrically substituted bis(alkyl)polyamine analogs in the mid-1980s was based on the theory that polyamines may utilize feedback mechanisms to auto-regulate their synthesis. In the 1990s, unsymmetrically substituted bis(alkyl) polyamine analogs were developed. These compounds display structure-dependent and cell type-specific cellular effects and regulation on polyamine metabolism. More recently, a novel class of analogs has been synthesized, which include conformationally restricted, cyclic and long-chain oligoamine analogs. The development and use of these analogs have provided valuable information for understanding the molecular mechanisms of targeting the polyamine pathway as a means of cancer therapy.
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Affiliation(s)
- Yi Huang
- Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University School of Medicine, Baltimore, MD 21231, USA
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Wang Y, Hacker A, Murray-Stewart T, Fleischer J, Woster P, Casero R. Induction of human spermine oxidase SMO(PAOh1) is regulated at the levels of new mRNA synthesis, mRNA stabilization and newly synthesized protein. Biochem J 2005; 386:543-7. [PMID: 15496143 PMCID: PMC1134873 DOI: 10.1042/bj20041084] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2004] [Revised: 10/14/2004] [Accepted: 10/21/2004] [Indexed: 11/17/2022]
Abstract
The oxidation of polyamines induced by antitumour polyamine analogues has been associated with tumour response to specific agents. The human spermine oxidase, SMO(PAOh1), is one enzyme that may play a direct role in the cellular response to the antitumour polyamine analogues. In the present study, the induction of SMO(PAOh1) enzyme activity by CPENSpm [N1-ethyl-N11-(cyclopropyl)methyl-4,8,diazaundecane] is demonstrated to be a result of newly synthesized mRNA and protein. Inhibition of new RNA synthesis by actinomycin D inhibits both the appearance of SMO(PAOh1) mRNA and enzyme activity. Similarly, inhibition of newly synthesized protein with cycloheximide prevents analogue-induced enzyme activity. Half-life determinations indicate that stabilization of SMO(PAOh1) protein does not play a significant role in analogue-induced activity. However, half-life experiments using actinomycin D indicate that CPENSpm treatment not only increases mRNA expression, but also leads to a significant increase in mRNA half-life (17.1 and 8.8 h for CPENSpm-treated cells and control respectively). Using reporter constructs encompassing the SMO(PAOh1) promoter region, a 30-90% increase in transcription is observed after exposure to CPENSpm. The present results are consistent with the hypothesis that analogue-induced expression of SMO(PAOh1) is a result of increased transcription and stabilization of SMO(PAOh1) mRNA, leading to increased protein production and enzyme activity. These data indicate that the major level of control of SMO(PAOh1) expression in response to polyamine analogues exposure is at the level of mRNA.
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Affiliation(s)
- Yanlin Wang
- *The Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University School of Medicine, Baltimore, MD 21231, U.S.A
| | - Amy Hacker
- *The Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University School of Medicine, Baltimore, MD 21231, U.S.A
| | - Tracy Murray-Stewart
- *The Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University School of Medicine, Baltimore, MD 21231, U.S.A
| | - Jennifer G. Fleischer
- *The Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University School of Medicine, Baltimore, MD 21231, U.S.A
| | - Patrick M. Woster
- †Department of Pharmaceutical Sciences, Wayne State University, 539 Shapero Hall, Detroit, MI 48202, U.S.A
| | - Robert A. Casero
- *The Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University School of Medicine, Baltimore, MD 21231, U.S.A
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Wu T, Ling KQ, Sayre LM, McIntire WS. Inhibition of murine N1-acetylated polyamine oxidase by an acetylenic amine and the allenic amine, MDL 72527. Biochem Biophys Res Commun 2005; 326:483-90. [PMID: 15582603 DOI: 10.1016/j.bbrc.2004.11.054] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2004] [Indexed: 11/24/2022]
Abstract
Murine N(1)-acetylated polyamine oxidase (mPAO) was treated with N,N'-bis-(prop-2-ynyl)-1,4-diaminobutane, a poor substrate and inhibitor for the enzyme, with K(m) and K(i) values in the millimolar range. Apparently, its oxidation produces prop-2-ynal, which reacts with amino acyl nucleophiles. Using a steady-state kinetic assay, four phases were identified, the first being the oxidation of the compound via Michealis-Menten-type kinetics. As prop-2-ynal accumulates, there is a biphasic reduction in the rate. This process leads to an mPAO form that is nearly inactive (fourth phase), but displays classical Michealis-Menten-type kinetics. The enzyme-bound flavin is not modified in this process. In contrast, micromolar concentrations of the MDL 72527 (N,N'-bis-[buta-2,3-dienyl]-1,4-diaminobutane) inhibited mPAO rapidly and completely. It inhibits by first binding tightly and apparently irreversibly, and then slowly converts to a species where the inhibitor is covalently bound to the N5-position of the flavin's isoalloxazine ring. The covalent adduct was identified as a flavocyanine.
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Affiliation(s)
- Tianyun Wu
- Molecular Biology Division, Department of Veterans Affairs Medical Center, San Francisco, CA 94121, USA
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