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Identification and Characterization of Novel Small-Molecule SMOX Inhibitors. Med Sci (Basel) 2022; 10:medsci10030047. [PMID: 36135832 PMCID: PMC9504029 DOI: 10.3390/medsci10030047] [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: 07/22/2022] [Revised: 08/11/2022] [Accepted: 08/22/2022] [Indexed: 11/29/2022] Open
Abstract
The major intracellular polyamines spermine and spermidine are abundant and ubiquitous compounds that are essential for cellular growth and development. Spermine catabolism is mediated by spermine oxidase (SMOX), a highly inducible flavin-dependent amine oxidase that is upregulated during excitotoxic, ischemic, and inflammatory states. In addition to the loss of radical scavenging capabilities associated with spermine depletion, the catabolism of spermine by SMOX results in the production of toxic byproducts, including H2O2 and acrolein, a highly toxic aldehyde with the ability to form adducts with DNA and inactivate vital cellular proteins. Despite extensive evidence implicating SMOX as a key enzyme contributing to secondary injury associated with multiple pathologic states, the lack of potent and selective inhibitors has significantly impeded the investigation of SMOX as a therapeutic target. In this study, we used a virtual and physical screening approach to identify and characterize a series of hit compounds with inhibitory activity against SMOX. We now report the discovery of potent and highly selective SMOX inhibitors 6 (IC50 0.54 μM, Ki 1.60 μM) and 7 (IC50 0.23 μM, Ki 0.46 μM), which are the most potent SMOX inhibitors reported to date. We hypothesize that these selective SMOX inhibitors will be useful as chemical probes to further elucidate the impact of polyamine catabolism on mechanisms of cellular injury.
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2
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Dunston TT, Khomutov MA, Gabelli SB, Stewart TM, Foley JR, Kochetkov SN, Khomutov AR, Casero Jr. RA. Identification of a Novel Substrate-Derived Spermine Oxidase Inhibitor. Acta Naturae 2020; 12:140-144. [PMID: 33173604 PMCID: PMC7604895 DOI: 10.32607/actanaturae.10992] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Homeostasis of the biogenic polyamines spermine (Spm) and spermidine (Spd),
present in μM-mM concentrations in all eukaryotic cells, is precisely
regulated by coordinated activities of the enzymes of polyamine synthesis,
degradation, and transport, in order to sustain normal cell growth and
viability. Spermine oxidase (SMOX) is the key and most recently discovered
enzyme of polyamine metabolism that plays an essential role in regulating
polyamine homeostasis by catalyzing the back-conversion of Spm to Spd. The
development of many types of epithelial cancer is associated with inflammation,
and disease-related inflammatory stimuli induce SMOX. MDL72527 is widely used
in vitro and in vivo as an irreversible
inhibitor of SMOX, but it is also potent towards
N1-acetylpolyamine oxidase. Although SMOX has high substrate
specificity, Spm analogues have not been systematically studied as enzyme
inhibitors. Here we demonstrate that
1,12-diamino-2,11-bis(methylidene)-4,9-diazadodecane (2,11-Met2-Spm) has, under
standard assay conditions, an IC50 value of 169 μM towards SMOX
and is an interesting instrument and lead compound for studying polyamine
catabolism.
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Affiliation(s)
- T. T. Dunston
- Sidney Kimmel Comprehensive Cancer Center, The Johns Hopkins University School of Medicine, Baltimore, MD 21287 USA
| | - M. A. Khomutov
- Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow, 119991 Russia
| | - S. B. Gabelli
- Sidney Kimmel Comprehensive Cancer Center, The Johns Hopkins University School of Medicine, Baltimore, MD 21287 USA
- Department of Medicine, The Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
- Department of Oncology, The Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA
| | - T. M. Stewart
- Sidney Kimmel Comprehensive Cancer Center, The Johns Hopkins University School of Medicine, Baltimore, MD 21287 USA
| | - J. R. Foley
- Sidney Kimmel Comprehensive Cancer Center, The Johns Hopkins University School of Medicine, Baltimore, MD 21287 USA
| | - S. N. Kochetkov
- Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow, 119991 Russia
| | - A. R. Khomutov
- Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow, 119991 Russia
| | - R. A. Casero Jr.
- Sidney Kimmel Comprehensive Cancer Center, The Johns Hopkins University School of Medicine, Baltimore, MD 21287 USA
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Sridharan A, Shi M, Leo VI, Subramaniam N, Lim TC, Uemura T, Igarashi K, Tien Guan ST, Tan NS, Vardy LA. The Polyamine Putrescine Promotes Human Epidermal Melanogenesis. J Invest Dermatol 2020; 140:2032-2040.e1. [PMID: 32119868 DOI: 10.1016/j.jid.2020.02.009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2019] [Revised: 01/17/2020] [Accepted: 02/03/2020] [Indexed: 12/25/2022]
Abstract
Hyperpigmentary conditions can arise when melanogenesis in the epidermis is misregulated. Understanding the pathways underlying melanogenesis is essential for the development of effective treatments. Here, we report that a group of metabolites called polyamines are important in the control of melanogenesis in human skin. Polyamines are cationic molecules present in all cells and are essential for cellular function. We report that polyamine regulator ODC1 is upregulated in melanocytes from melasma lesional skin. We report that the polyamine putrescine can promote pigmentation in human skin explants and primary normal human epidermal melanocytes through induction of tyrosinase which is rate-limiting for the synthesis of melanin. Putrescine supplementation on normal human epidermal melanocytes results in the activation of polyamine catabolism, which results in increased intracellular H2O2. Polyamine catabolism is also increased in human skin explants that have been treated with putrescine. We further report that inhibition of polyamine catabolism prevents putrescine-induced promotion of tyrosinase levels and pigmentation in normal human epidermal melanocytes, showing that polyamine catabolism is responsible for the putrescine induction of melanogenesis. Our data showing that putrescine promotes pigmentation has important consequences for hyperpigmented and hypopigmented conditions. Further understanding of how polyamines control epidermal pigmentation could open the door for the development of new therapeutics.
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Affiliation(s)
- Aishwarya Sridharan
- Skin Research Institute of Singapore, Agency for Science, Technology and Research, Biomedical Grove, Immunos, Singapore
| | - Meng Shi
- Skin Research Institute of Singapore, Agency for Science, Technology and Research, Biomedical Grove, Immunos, Singapore
| | - Vonny Ivon Leo
- Skin Research Institute of Singapore, Agency for Science, Technology and Research, Biomedical Grove, Immunos, Singapore
| | - Nagavidya Subramaniam
- Skin Research Institute of Singapore, Agency for Science, Technology and Research, Biomedical Grove, Immunos, Singapore
| | - Thiam Chye Lim
- Division of Plastic, Reconstructive and Aesthetic Surgery, Department of Surgery, National University Hospital and National University of Singapore, Kent Ridge Wing, Singapore
| | - Takeshi Uemura
- Graduate School of Pharmaceutical Sciences, Chiba University, Chiba, Japan
| | - Kazuei Igarashi
- Graduate School of Pharmaceutical Sciences, Chiba University, Chiba, Japan
| | - Steven Thng Tien Guan
- Skin Research Institute of Singapore, Agency for Science, Technology and Research, Biomedical Grove, Immunos, Singapore
| | - Nguan Soon Tan
- Lee Kong Chian School of Medicine, Nanyang Technological University Singapore, Singapore; School of Biological Sciences, Nanyang Technological University, Nanyang Drive, Singapore
| | - Leah A Vardy
- Skin Research Institute of Singapore, Agency for Science, Technology and Research, Biomedical Grove, Immunos, Singapore; School of Biological Sciences, Nanyang Technological University, Nanyang Drive, Singapore.
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4
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Pires N, Maiale S, Venturino A, Lascano C. Differential effects of azinphos-methyl and chlorpyrifos on polyamine oxidative metabolism during the embryonic development of Rhinella arenarum and its relation to oxidative stress. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2020; 163:14-22. [PMID: 31973851 DOI: 10.1016/j.pestbp.2019.10.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2019] [Revised: 10/08/2019] [Accepted: 10/11/2019] [Indexed: 06/10/2023]
Abstract
The organophosphorus pesticides azinphos-methyl (AZM) and chlorpyrifos (CPF) exert their toxic action by inhibition of acetylcholinesterase, but non-target processes such as polyamine metabolism can also be affected. Our objective was to evaluate the effects of different concentrations of AZM (0.5-, 2- and 9 mg L-1) and CPF (0.5- and 1 mg L-1) on polyamine oxidative metabolism along Rhinella arenarum embryonic development and to explore its relationship to oxidative stress. Free and conjugated polyamines were measured by HPLC. The activity of spermine oxidase (SMOX), N1-acetylpolyamine oxidase (PAOX) and diamine oxidase (DAO) were measured through kinetic spectrofluorometry. Free putrescine and spermine were significantly increased in open mouth embryos exposed to AZM. Free polyamine levels were not affected by CPF exposure. In embryos exposed to AZM, DAO was increased in tail bud stage and SMOX was increased in open mouth stage, while embryos exposed to CPF showed an increase of PAOX activity in tail bud stage and a decrease of DAO and SMOX activity in open mouth stage. Polyamine levels and oxidative degradation enzymes respond differently if R. arenarum embryos are exposed to AZM or CPF, despite that both insecticides belong to the same chemical family. The early increase of DAO and PAOX would play a protective role to guarantee the normal progression of embryonic development. The increased production of reactive species might contribute to an oxidative stress situation generated by exposure to the insecticides and to the alteration of the antioxidant defense system. In tail bud stage embryos, PAOX and SMOX were positively correlated to acetylcholinesterase activity and reduced glutathione levels (GSH), and negatively correlated to the antioxidant enzymes catalase (CAT) and glutathione S-transferase (GST). In complete operculum embryos, a negative correlation between antioxidant parameters and polyamine levels and polyamine oxidative metabolism was observed, except for SMOX, which showed a low positive correlation with CAT and GSH and a negative correlation to PAOX and DAO. We suggest the use of DAO and PAOX as biomarkers of exposure to AZM and CPF, respectively, as they respond earlier than the classical biomarker acetylcholinesterase.
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Affiliation(s)
- Natalia Pires
- Centro de Investigaciones en Toxicología Ambiental y Agrobiotecnología del Comahue (CITAAC), Universidad Nacional del Comahue-Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET). Buenos Aires 1400, 8300 Neuquén, Neuquén, Argentina; Facultad de Ciencias Médicas, Universidad Nacional del Comahue. Toschi y Arrayanes, 8324 Cipolletti, Rio Negro, Argentina
| | - Santiago Maiale
- Instituto Tecnológico Chascomús, Universidad Nacional de General San Martín-Consejo Nacional de Investigaciones Científicas y Técnicas (INTECH/UNSAM-CONICET). Av. Intendente Marino, Km 8, 200 CC 164, 7130 Chascomús, Buenos Aires, Argentina
| | - Andrés Venturino
- Centro de Investigaciones en Toxicología Ambiental y Agrobiotecnología del Comahue (CITAAC), Universidad Nacional del Comahue-Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET). Buenos Aires 1400, 8300 Neuquén, Neuquén, Argentina; Facultad de Ciencias Agrarias, Universidad Nacional del Comahue. Ruta 151, Km 12,5, 8303 Cinco Saltos, Rio Negro, Argentina
| | - Cecilia Lascano
- Centro de Investigaciones en Toxicología Ambiental y Agrobiotecnología del Comahue (CITAAC), Universidad Nacional del Comahue-Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET). Buenos Aires 1400, 8300 Neuquén, Neuquén, Argentina; Facultad de Ciencias Agrarias, Universidad Nacional del Comahue. Ruta 151, Km 12,5, 8303 Cinco Saltos, Rio Negro, Argentina.
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Murray Stewart T, Khomutov M, Foley JR, Guo X, Holbert CE, Dunston TT, Schwartz CE, Gabrielson K, Khomutov A, Casero RA. ( R, R)-1,12-Dimethylspermine can mitigate abnormal spermidine accumulation in Snyder-Robinson syndrome. J Biol Chem 2020; 295:3247-3256. [PMID: 31996374 DOI: 10.1074/jbc.ra119.011572] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2019] [Revised: 01/21/2020] [Indexed: 11/06/2022] Open
Abstract
Snyder-Robinson syndrome (SRS) is an X-linked intellectual disability syndrome caused by a loss-of-function mutation in the spermine synthase (SMS) gene. Primarily affecting males, the main manifestations of SRS include osteoporosis, hypotonic stature, seizures, cognitive impairment, and developmental delay. Because there is no cure for SRS, treatment plans focus on alleviating symptoms rather than targeting the underlying causes. Biochemically, the cells of individuals with SRS accumulate excess spermidine, whereas spermine levels are reduced. We recently demonstrated that SRS patient-derived lymphoblastoid cells are capable of transporting exogenous spermine and its analogs into the cell and, in response, decreasing excess spermidine pools to normal levels. However, dietary supplementation of spermine does not appear to benefit SRS patients or mouse models. Here, we investigated the potential use of a metabolically stable spermine mimetic, (R,R)-1,12-dimethylspermine (Me2SPM), to reduce the intracellular spermidine pools of SRS patient-derived cells. Me2SPM can functionally substitute for the native polyamines in supporting cell growth while stimulating polyamine homeostatic control mechanisms. We found that both lymphoblasts and fibroblasts from SRS patients can accumulate Me2SPM, resulting in significantly decreased spermidine levels with no adverse effects on growth. Me2SPM administration to mice revealed that Me2SPM significantly decreases spermidine levels in multiple tissues. Importantly, Me2SPM was detectable in brain tissue, the organ most affected in SRS, and was associated with changes in polyamine metabolic enzymes. These findings indicate that the (R,R)-diastereomer of 1,12-Me2SPM represents a promising lead compound in developing a treatment aimed at targeting the molecular mechanisms underlying SRS pathology.
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Affiliation(s)
- Tracy Murray Stewart
- Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins School of Medicine, Baltimore, Maryland 21287
| | - Maxim Khomutov
- Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow 119991, Russia
| | - Jackson R Foley
- Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins School of Medicine, Baltimore, Maryland 21287
| | - Xin Guo
- Department of Molecular and Comparative Pathobiology, Johns Hopkins School of Medicine, Baltimore, Maryland 21205
| | - Cassandra E Holbert
- Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins School of Medicine, Baltimore, Maryland 21287
| | - Tiffany T Dunston
- Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins School of Medicine, Baltimore, Maryland 21287
| | | | - Kathleen Gabrielson
- Department of Molecular and Comparative Pathobiology, Johns Hopkins School of Medicine, Baltimore, Maryland 21205
| | - Alexey Khomutov
- Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow 119991, Russia
| | - Robert A Casero
- Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins School of Medicine, Baltimore, Maryland 21287.
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6
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Zhou J, Tang L, Wang JS. Assessment of the adverse impacts of aflatoxin B 1 on gut-microbiota dependent metabolism in F344 rats. CHEMOSPHERE 2019; 217:618-628. [PMID: 30447610 DOI: 10.1016/j.chemosphere.2018.11.044] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2018] [Revised: 11/04/2018] [Accepted: 11/05/2018] [Indexed: 06/09/2023]
Abstract
The adverse impacts of AFB1 on gut-microbiota dependent metabolism in F344 rats were assessed via ultra-high performance liquid chromatography (UHPLC)-profiling and UHPLC-mass spectrometry (MS) metabolomic analyses. UHPLC-profiling analysis found 1100 raw peaks from the fecal samples collected at week 4, of which 335 peaks showed peak shape qualified for quantitation. A total of 24, 40 and 71 peaks were significantly decreased (>2-fold, p < 0.05) among the exposure groups treated with 5, 25, and 75 μg AFB1 kg-1 body weight (B. W.), respectively. Supervised orthogonal partial least squares projection to latent structures-discriminant analysis revealed 11 differential peaks that may be used to predict AFB1-induced adverse changes of the metabolites. UHPLC-MS based metabolomic analysis discovered 494 features that were significantly altered by AFB1, and 234 of them were imputatively identified using Human Metabolome Data Base (HMDB). Metabolite set enrichment analysis showed that the highly disrupted metabolic pathways were: protein biosynthesis, pantothenate and CoA biosynthesis, betaine metabolism, cysteine metabolism, and methionine metabolism. Eight features were rated as indicative metabolites for AFB1 exposure: 3-decanol, xanthylic acid, norspermidine, nervonyl carnitine, pantothenol, threitol, 2-hexanoyl carnitine, and 1-nitrohexane. These data suggest that AFB1 could significantly reduce the variety of nutrients in gut and disrupt a number of gut-microbiota dependent metabolic pathways, which may contribute to the AFB1-associated stunted growth, liver diseases and the immune toxic effects that have been observed in animal models and human populations.
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Affiliation(s)
- Jun Zhou
- Interdisciplinary Toxicology Program, University of Georgia, Athens, GA 30602, United States; Department of Environmental Health Science, College of Public Health, University of Georgia, Athens, GA 30602, United States
| | - Lili Tang
- Interdisciplinary Toxicology Program, University of Georgia, Athens, GA 30602, United States; Department of Environmental Health Science, College of Public Health, University of Georgia, Athens, GA 30602, United States
| | - Jia-Sheng Wang
- Interdisciplinary Toxicology Program, University of Georgia, Athens, GA 30602, United States; Department of Environmental Health Science, College of Public Health, University of Georgia, Athens, GA 30602, United States.
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7
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Polyamine Homeostasis in Snyder-Robinson Syndrome. Med Sci (Basel) 2018; 6:medsci6040112. [PMID: 30544565 PMCID: PMC6318755 DOI: 10.3390/medsci6040112] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2018] [Revised: 11/29/2018] [Accepted: 12/03/2018] [Indexed: 02/04/2023] Open
Abstract
Loss-of-function mutations of the spermine synthase gene (SMS) result in Snyder-Robinson Syndrome (SRS), a recessive X-linked syndrome characterized by intellectual disability, osteoporosis, hypotonia, speech abnormalities, kyphoscoliosis, and seizures. As SMS catalyzes the biosynthesis of the polyamine spermine from its precursor spermidine, SMS deficiency causes a lack of spermine with an accumulation of spermidine. As polyamines, spermine, and spermidine play essential cellular roles that require tight homeostatic control to ensure normal cell growth, differentiation, and survival. Using patient-derived lymphoblast cell lines, we sought to comprehensively investigate the effects of SMS deficiency on polyamine homeostatic mechanisms including polyamine biosynthetic and catabolic enzymes, derivatives of the natural polyamines, and polyamine transport activity. In addition to decreased spermine and increased spermidine in SRS cells, ornithine decarboxylase activity and its product putrescine were significantly decreased. Treatment of SRS cells with exogenous spermine revealed that polyamine transport was active, as the cells accumulated spermine, decreased their spermidine level, and established a spermidine-to-spermine ratio within the range of wildtype cells. SRS cells also demonstrated elevated levels of tissue transglutaminase, a change associated with certain neurodegenerative diseases. These studies form a basis for further investigations into the leading biochemical changes and properties of SMS-mutant cells that potentially represent therapeutic targets for the treatment of Snyder-Robinson Syndrome.
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8
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Uemura T, Watanabe K, Ishibashi M, Saiki R, Kuni K, Nishimura K, Toida T, Kashiwagi K, Igarashi K. Aggravation of brain infarction through an increase in acrolein production and a decrease in glutathione with aging. Biochem Biophys Res Commun 2016; 473:630-5. [PMID: 27037020 DOI: 10.1016/j.bbrc.2016.03.137] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2016] [Accepted: 03/29/2016] [Indexed: 10/22/2022]
Abstract
We previously reported that tissue damage during brain infarction was mainly caused by inactivation of proteins by acrolein. This time, it was tested why brain infarction increases in parallel with aging. A mouse model of photochemically induced thrombosis (PIT) was studied using 2, 6, and 12 month-old female C57BL/6 mice. The size of brain infarction in the mouse PIT model increased with aging. The volume of brain infarction in 12 month-old mice was approximately 2-fold larger than that in 2 month-old mice. The larger brain infarction in 12 month-old mice was due to an increase in acrolein based on an increase in the activity of spermine oxidase, together with a decrease in glutathione (GSH), a major acrolein-detoxifying compound in cells, based on the decrease in one of the subunits of glutathione biosynthesizing enzymes, γ-glutamylcysteine ligase modifier subunit, with aging. The results indicate that aggravation of brain infarction with aging was mainly due to the increase in acrolein production and the decrease in GSH in brain.
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Affiliation(s)
- Takeshi Uemura
- Amine Pharma Research Institute, Innovation Plaza at Chiba University, Chiba, Japan
| | - Kenta Watanabe
- Graduate School of Pharmaceutical Sciences, Chiba University, Chiba, Japan
| | - Misaki Ishibashi
- Graduate School of Pharmaceutical Sciences, Chiba University, Chiba, Japan
| | - Ryotaro Saiki
- Amine Pharma Research Institute, Innovation Plaza at Chiba University, Chiba, Japan
| | - Kyoshiro Kuni
- Graduate School of Pharmaceutical Sciences, Chiba University, Chiba, Japan
| | - Kazuhiro Nishimura
- Graduate School of Pharmaceutical Sciences, Chiba University, Chiba, Japan
| | - Toshihiko Toida
- Graduate School of Pharmaceutical Sciences, Chiba University, Chiba, Japan
| | - Keiko Kashiwagi
- Faculty of Pharmacy, Chiba Institute of Science, Choshi, Chiba, Japan
| | - Kazuei Igarashi
- Amine Pharma Research Institute, Innovation Plaza at Chiba University, Chiba, Japan; Graduate School of Pharmaceutical Sciences, Chiba University, Chiba, Japan.
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9
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Abstract
Polyamines are ubiquitous and essential components of mammalian cells. They have multiple functions including critical roles in nucleic acid and protein synthesis, gene expression, protein function, protection from oxidative damage, the regulation of ion channels, and maintenance of the structure of cellular macromolecules. It is essential to maintain a correct level of polyamines, and this amount is tightly regulated at the levels of transport, synthesis, and degradation. Catabolic pathways generate reactive aldehydes including acrolein and hydrogen peroxide via a number of oxidases. These metabolites, particularly those from spermine, can cause significant toxicity with damage to proteins, DNA, and other cellular components. Their production can be increased as a result of infection or cell damage that releases free polyamines and activates the oxidative catabolic pathways. Since polyamines also have an important physiological role in protection from oxidative damage, the reduction in polyamine content may exacerbate the toxic potential of these agents. Increases in polyamine catabolism have been implicated in the development of diseases including stroke, other neurological diseases, renal failure, liver disease, and cancer. These results provide new opportunities for the early diagnosis, prevention, and treatment of disease.
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Affiliation(s)
- Anthony E Pegg
- Department of Cellular and Molecular Physiology, Milton S. Hershey Medical Center, Pennsylvania State University College of Medicine , Hershey, Pennsylvania 17033, United States
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Uemura T, Tanaka Y, Higashi K, Miyamori D, Takasaka T, Nagano T, Toida T, Yoshimoto K, Igarashi K, Ikegaya H. Acetaldehyde-induced cytotoxicity involves induction of spermine oxidase at the transcriptional level. Toxicology 2013; 310:1-7. [PMID: 23707493 DOI: 10.1016/j.tox.2013.05.008] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2013] [Revised: 05/05/2013] [Accepted: 05/15/2013] [Indexed: 01/08/2023]
Abstract
Ethanol consumption causes serious liver injury including cirrhosis and hepatocellular carcinoma. Ethanol is metabolized mainly in the liver to acetic acid through acetaldehyde. We investigated the effect of ethanol and acetaldehyde on polyamine metabolism since polyamines are essential factors for normal cellular functions. We found that acetaldehyde induced spermine oxidase (SMO) at the transcriptional level in HepG2 cells. The levels and activities of ornithine decarboxylase (ODC) and spermidine/spermine acetyltransferase (SSAT) were not affected by acetaldehyde. Spermidine content was increased and spermine content was decreased by acetaldehyde treatment. Knockdown of SMO expression using siRNA reduced acetaldehyde toxicity. Acetaldehyde exposure increased free acrolein levels. An increase of acrolein by acetaldehyde was SMO dependent. Our results indicate that cytotoxicity of acetaldehyde involves, at least in part, oxidation of spermine to spermidine by SMO, which is induced by acetaldehyde.
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Affiliation(s)
- Takeshi Uemura
- Department of Forensic Medicine, Kyoto Prefectural University of Medicine, Graduate School of Medical Sciences, 465 Kajii-cho, Kawaramachi-Hirokoji, Kamigyo-ku, Kyoto 602-8566, Japan.
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11
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Moriya S, Iwasaki K, Samejima K, Takao K, Kohda K, Hiramatsu K, Kawakita M. A mass spectrometric method to determine activities of enzymes involved in polyamine catabolism. Anal Chim Acta 2012; 748:45-52. [PMID: 23021806 DOI: 10.1016/j.aca.2012.08.031] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2012] [Accepted: 08/20/2012] [Indexed: 11/23/2022]
Abstract
An analytical method for the determination of three polyamines (putrescine, spermidine, and spermine) and five acetylpolyamines [N(1)-acetylspermidine (N(1)AcSpd), N(8)-acetylspermidine (N(8)AcSpd), N(1)-acetylspermine, N(1),N(8)-diacetylspermidine, and N(1),N(12)-diacetylspermine] involved in the polyamine catabolic pathway has been developed using a hybrid tandem mass spectrometer. Heptafluorobutyryl (HFB) derivatives of these compounds and respective internal standards labeled with stable isotopes were analyzed simultaneously by TOF MS, based on peak areas appearing at appropriate m/z values. The isomers, N(1)AcSpd and N(8)AcSpd were determined from their fragment ions, the acetylamidopropyl and acetylamidobutyl groups, respectively, using MS/MS with (13)C(2)-N(1)AcSpd and (13)C(2)-N(8)AcSpd which have the (13)C(2)-acetyl group as an internal standard. The TOF MS method was successfully applied to measure the activity of enzymes involved in polyamine catabolic pathways, namely N(1)-acetylpolyamine oxidase (APAO), spermine oxidase (SMO), and spermidine/spermine N(1)-acetyltransferase (SSAT). The following natural substrates and products labeled with stable isotopes considering the application to biological samples were identified; for APAO, [4,9,12-(15)N(3)]-N(1)-acetylspermine and [1,4,8-(15)N(3)]spermidine ((15)N(3)-Spd), respectively; for SMO, [1,4,8,12-(15)N(4)]spermine and (15)N(3)-Spd, respectively; and for SSAT, (15)N(3)-Spd and [1,4,8-(15)N(3)]-N(1)-acetylspermidine, respectively.
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Affiliation(s)
- Shunsuke Moriya
- Department of Molecular Medicine, Tokyo Metropolitan Institute of Medical Science, 2-1-6 Kami-kitazawa, Tokyo 156-8506, Japan
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