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Gorska-Ponikowska M, Ploska A, Jacewicz D, Szkatula M, Barone G, Lo Bosco G, Lo Celso F, Dabrowska AM, Kuban-Jankowska A, Gorzynik-Debicka M, Knap N, Chmurzynski L, Dobrucki LW, Kalinowski L, Wozniak M. Modification of DNA structure by reactive nitrogen species as a result of 2-methoxyestradiol-induced neuronal nitric oxide synthase uncoupling in metastatic osteosarcoma cells. Redox Biol 2020; 32:101522. [PMID: 32305006 PMCID: PMC7162974 DOI: 10.1016/j.redox.2020.101522] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2020] [Revised: 03/23/2020] [Accepted: 03/24/2020] [Indexed: 12/16/2022] Open
Abstract
2-methoxyestradiol (2-ME) is a physiological anticancer compound, metabolite of 17β-estradiol. Previously, our group evidenced that from mechanistic point of view one of anticancer mechanisms of action of 2-ME is specific induction and nuclear hijacking of neuronal nitric oxide synthase (nNOS), resulting in local generation of nitro-oxidative stress and finally, cancer cell death. The current study aims to establish the substantial mechanism of generation of reactive nitrogen species by 2-ME. We further achieved to identify the specific reactive nitrogen species involved in DNA-damaging mechanism of 2-ME. The study was performed using metastatic osteosarcoma 143B cells. We detected the release of biologically active (free) nitric oxide (•NO) with concurrent measurements of peroxynitrite (ONOO−) in real time in a single cell of 143B cell line by using •NO/ONOO− sensitive microsensors after stimulation with calcium ionophore. Detection of nitrogen dioxide (•NO2) and determination of chemical rate constants were carried out by a stopped-flow technique. The affinity of reactive nitrogen species toward the guanine base of DNA was evaluated by density functional theory calculations. Expression and localization of nuclear factor NF-kB was determined using imaging cytometry, while cell viability assay was evaluated by MTT assay. Herein, we presented that 2-ME triggers pro-apoptotic signalling cascade by increasing cellular reactive nitrogen species overproduction – a result of enzymatic uncoupling of increased nNOS protein levels. In particular, we proved that ONOO− and •NO2 directly formed from peroxynitrous acid (ONOOH) and/or by auto-oxidation of •NO, are inducers of DNA damage in anticancer mechanism of 2-ME. Specifically, the affinity of reactive nitrogen species toward the guanine base of DNA, evaluated by density functional theory calculations, decreased in the order: ONOOH > ONOO− > •NO2 > •NO. Therefore, we propose to consider the specific inducers of nNOS as an effective tool in the field of chemotherapy.
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Affiliation(s)
- Magdalena Gorska-Ponikowska
- Department of Medical Chemistry, Medical University of Gdansk, 1 Debinki St, 80-211, Gdansk, Poland; Euro-Mediterranean Institute of Science and Technology, Palermo, Italy; Department of Biophysics, Institute of Biomaterials and Biomolecular Systems, University of Stuttgart, Stuttgart, Germany.
| | - Agata Ploska
- Department of Medical Laboratory Diagnostics, Medical University of Gdansk, Gdansk, Poland; Biobanking and Biomolecular Resources Research Infrastructure Poland (BBMRI.PL), Gdansk, Poland
| | - Dagmara Jacewicz
- Department of General and Inorganic Chemistry, University of Gdansk, Gdansk, Poland
| | - Michal Szkatula
- Department of Medical Chemistry, Medical University of Gdansk, 1 Debinki St, 80-211, Gdansk, Poland
| | - Giampaolo Barone
- Department of Biological, Chemical and Pharmaceutical Sciences and Technologies, University of Palermo,Palermo, Italy
| | - Giosuè Lo Bosco
- Euro-Mediterranean Institute of Science and Technology, Palermo, Italy; Department of Mathematics and Computer Science, University of Palermo, Palermo, Italy
| | - Fabrizio Lo Celso
- Department of Physics and Chemistry "Emilio Segrè", University of Palermo, Palermo, Italy
| | | | - Alicja Kuban-Jankowska
- Department of Medical Chemistry, Medical University of Gdansk, 1 Debinki St, 80-211, Gdansk, Poland
| | - Monika Gorzynik-Debicka
- Department of Medical Chemistry, Medical University of Gdansk, 1 Debinki St, 80-211, Gdansk, Poland
| | - Narcyz Knap
- Department of Medical Chemistry, Medical University of Gdansk, 1 Debinki St, 80-211, Gdansk, Poland
| | - Lech Chmurzynski
- Department of General and Inorganic Chemistry, University of Gdansk, Gdansk, Poland
| | - Lawrence Wawrzyniec Dobrucki
- Department of Medical Laboratory Diagnostics, Medical University of Gdansk, Gdansk, Poland; Biobanking and Biomolecular Resources Research Infrastructure Poland (BBMRI.PL), Gdansk, Poland; Department of Bioengineering, University of Illinois at Urbana-Champaign, Urbana, IL, USA; Beckman Institute for Advanced Science and Technology, Urbana, IL, USA
| | - Leszek Kalinowski
- Department of Medical Laboratory Diagnostics, Medical University of Gdansk, Gdansk, Poland; Biobanking and Biomolecular Resources Research Infrastructure Poland (BBMRI.PL), Gdansk, Poland
| | - Michal Wozniak
- Department of Medical Chemistry, Medical University of Gdansk, 1 Debinki St, 80-211, Gdansk, Poland
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Kamm A, Przychodzen P, Kuban-Jankowska A, Jacewicz D, Dabrowska AM, Nussberger S, Wozniak M, Gorska-Ponikowska M. Nitric oxide and its derivatives in the cancer battlefield. Nitric Oxide 2019; 93:102-114. [PMID: 31541733 DOI: 10.1016/j.niox.2019.09.005] [Citation(s) in RCA: 64] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2019] [Revised: 08/06/2019] [Accepted: 09/16/2019] [Indexed: 12/14/2022]
Abstract
Elevated levels of reactive nitrogen species, alteration in redox balance and deregulated redox signaling are common hallmarks of cancer progression and chemoresistance. However, depending on the cellular context, distinct reactive nitrogen species are also hypothesized to mediate cytotoxic activity and are thus used in anticancer therapies. We present here the dual face of nitric oxide and its derivatives in cancer biology. Main derivatives of nitric oxide, such as nitrogen dioxide and peroxynitrite cause cell death by inducing protein and lipid peroxidation and/or DNA damage. Moreover, they control the activity of important protein players within the pro- and anti-apoptotic signaling pathways. Thus, the control of intracellular reactive nitrogen species may become a sophisticated tool in anticancer strategies.
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Affiliation(s)
- Anna Kamm
- Department of Medical Chemistry, Faculty of Medicine, Medical University of Gdansk, Gdansk, Poland
| | - Paulina Przychodzen
- Department of Medical Chemistry, Faculty of Medicine, Medical University of Gdansk, Gdansk, Poland
| | - Alicja Kuban-Jankowska
- Department of Medical Chemistry, Faculty of Medicine, Medical University of Gdansk, Gdansk, Poland
| | | | | | - Stephan Nussberger
- Department of Biophysics, Institute of Biomaterials and Biomolecular Systems, University of Stuttgart, Stuttgart, Germany
| | - Michal Wozniak
- Department of Medical Chemistry, Faculty of Medicine, Medical University of Gdansk, Gdansk, Poland
| | - Magdalena Gorska-Ponikowska
- Department of Medical Chemistry, Faculty of Medicine, Medical University of Gdansk, Gdansk, Poland; Department of Biophysics, Institute of Biomaterials and Biomolecular Systems, University of Stuttgart, Stuttgart, Germany; Euro-Mediterranean Institute of Science and Technology, Palermo, Italy.
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3
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Drzeżdżon J, Jacewicz D, Sielicka A, Chmurzyński L. MALDI-MS for polymer characterization – Recent developments and future prospects. Trends Analyt Chem 2019. [DOI: 10.1016/j.trac.2019.04.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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4
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Drzeżdżon J, Piotrowska-Kirschling A, Malinowski J, Kloska A, Gawdzik B, Chmurzyński L, Jacewicz D. Antimicrobial, cytotoxic, and antioxidant activities and physicochemical characteristics of chromium(III) complexes with picolinate, dipicolinate, oxalate, 2,2′-bipyridine, and 4,4′-dimethoxy-2,2′-bipyridine as ligands in aqueous solutions. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.03.049] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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5
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Drzeżdżon J, Jacewicz D, Sielicka A, Chmurzyński L. Characterization of polymers based on differential scanning calorimetry based techniques. Trends Analyt Chem 2019. [DOI: 10.1016/j.trac.2018.10.037] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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6
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Drzeżdżon J, Jacewicz D, Chmurzyński L. The impact of environmental contamination on the generation of reactive oxygen and nitrogen species - Consequences for plants and humans. ENVIRONMENT INTERNATIONAL 2018; 119:133-151. [PMID: 29957355 DOI: 10.1016/j.envint.2018.06.019] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2018] [Revised: 06/15/2018] [Accepted: 06/16/2018] [Indexed: 05/23/2023]
Abstract
Environmental contaminants, such as heavy metals, nanomaterials, and pesticides, induce the formation of reactive oxygen and nitrogen species (RONS). Plants interact closely with the atmosphere, water, and soil, and consequently RONS intensely affect their biochemistry. For the past 30 years researchers have thoroughly examined the role of RONS in plant organisms and oxidative modifications to cellular components. Hydrogen peroxide, superoxide anion, nitrogen(II) oxide, and hydroxyl radicals have been found to take part in many metabolic pathways. In this review the various aspects of the oxidative stress induced by environmental contamination are described based on an analysis of literature. The review reinforces the contention that RONS play a dual role, that is, both a deleterious and a beneficial one, in plants. Environmental contamination affects human health, also, and so we have additionally described the impact of RONS on the coupled human - environment system.
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Affiliation(s)
- Joanna Drzeżdżon
- Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, 80-308 Gdańsk, Poland
| | - Dagmara Jacewicz
- Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, 80-308 Gdańsk, Poland.
| | - Lech Chmurzyński
- Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, 80-308 Gdańsk, Poland
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Tesmar A, Wyrzykowski D, Kazimierczuk K, Kłak J, Kowalski S, Inkielewicz-Stępniak I, Drzeżdżon J, Jacewicz D, Chmurzyński L. Structure, Physicochemical and Biological Properties of an Aqua (2,2′,2′′-Nitrilotriacetato)-oxidovanadium(IV) Salt with 4-Methylpyridinium Cation. Z Anorg Allg Chem 2017. [DOI: 10.1002/zaac.201700022] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
| | | | - Katarzyna Kazimierczuk
- Department of Inorganic Chemistry; Gdańsk University of Technology; Narutowicza 11/12 80-233 Gdańsk Poland
| | - Julia Kłak
- Faculty of Chemistry; Wrocław University; 14 F. Joliot-Curie St. 50-383 Wroclaw Poland
| | - Szymon Kowalski
- Department of Medical Chemistry; Medical University of Gdańsk; Dębinki 1 80-211 Gdańsk Poland
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Pranczk J, Tesmar A, Wyrzykowski D, Inkielewicz-Stępniak I, Jacewicz D, Chmurzyński L. Influence of Primary Ligands (ODA, TDA) on Physicochemical and Biological Properties of Oxidovanadium (IV) Complexes with Bipy and Phen as Auxiliary Ligands. Biol Trace Elem Res 2016; 174:251-258. [PMID: 27048276 DOI: 10.1007/s12011-016-0687-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/15/2016] [Accepted: 03/23/2016] [Indexed: 02/01/2023]
Abstract
The influence of the oxydiacetate (ODA) and thiodiacetate (TDA) ligands on the physicochemical and biological properties of the oxidovanadium(IV) ternary complexes of the VO(L)(B) type, where L denotes ODA or TDA and B denotes 2,2'-bipyridine (bipy) or 1,10-phenanthroline (phen), has been investigated. The stability of the complexes in aqueous solutions, assessed based on the potentiometric titration method, increases in the following direction: VO(TDA)(bipy) < VO(ODA)(bipy) < VO(TDA)(phen) < VO(ODA)(phen). Furthermore, the influence of the TDA and ODA ligands on the antioxidant activity of the oxidovanadium(IV) complexes toward superoxide free radical (O2•-), 2,2'-azinobis(3-ethylbenzothiazoline-6 sulfonic acid) cation radical (ABTS+•) and 2,2-diphenyl-1-picrylhydrazyl radical (DPPH•) has been examined and discussed. The reactivity of the complexes toward O2•- increases in the following direction: VO(TDA)(phen) < VO(TDA)(bipy) ≈ VO(ODA)(bipy) < VO(ODA)(phen). The antioxidant activity against ABTS+• and DPPH• free radicals is higher for phen complexes, whereas the thiodiacetate complexes are more reactive than are the corresponding oxydiacetate ones. Finally, herein, the cytoprotective activity of the complexes against the oxidative damage generated exogenously by hydrogen peroxide in the hippocampal neuronal HT22 cell line (the MTT and LDH tests) is reported. In a low concentration (1 μM), the cytoprotective action of thiodiacetate complexes is much higher than that of the corresponding oxydiacetate complexes. However, in the higher concentration range (10 and 100 μM), the antioxidant activity of the complexes is overcompensated by their cytotoxic effect.
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Affiliation(s)
- Joanna Pranczk
- Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, 80-308, Gdańsk, Poland
| | - Aleksandra Tesmar
- Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, 80-308, Gdańsk, Poland
| | - Dariusz Wyrzykowski
- Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, 80-308, Gdańsk, Poland.
| | | | - Dagmara Jacewicz
- Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, 80-308, Gdańsk, Poland
| | - Lech Chmurzyński
- Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, 80-308, Gdańsk, Poland
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Tesmar A, Inkielewicz-Stępniak I, Sikorski A, Wyrzykowski D, Jacewicz D, Zięba P, Pranczk J, Ossowski T, Chmurzyński L. Structure, physicochemical and biological properties of new complex salt of aqua-(nitrilotriacetato-N,O,O',O")-oxidovanadium(IV) anion with 1,10-phenanthrolinium cation. J Inorg Biochem 2015; 152:53-61. [PMID: 26349013 DOI: 10.1016/j.jinorgbio.2015.08.002] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2014] [Revised: 07/23/2015] [Accepted: 08/04/2015] [Indexed: 02/02/2023]
Abstract
The crystal structure of new 1,10-phenathrolin-1-ium aqua-(nitrilotriacetato-N,O,O',O")-oxidovanadium(IV) semihydrate of molecular formula (phenH)[VO(NTA)(H2O)]∙1/2H2O was determined. This is the first example of structurally characterized compound that comprises a distinctly separated, monomeric [VO(NTA)(H2O)](-) coordination entity. The crystallographic measurements have subsequently been complemented by the IR spectroscopic characterization and thermal analysis. Furthermore, the electrochemical (cyclic voltammetry) as well as spectrophotometric (UV-vis) studies revealed that the compound is capable of scavenging the superoxide free radicals (O2(-)) as well as stable organic radicals i.e. 2,2'-azinobis(3-ethylbenzothiazoline-6 sulfonic acid) cation radical (ABTS(+)) and 2,2-diphenyl-1-picrylhydrazyl radical (DPPH), but its reactivity towards radicals is lower than that of VOSO4. Finally, biological properties of the complex in the range of 1-100 μM were investigated in relation to its cytoprotective activity against the oxidative damage generated exogenously by using hydrogen peroxide in the hippocampal neuronal HT22 cell line (the MTT and LDH tests). It has been established that in contrast to VOSO4 the title compound protects the HT22 from the oxidative damage. The paper presents a new perspective for oxidovanadium(IV) complexes as candidates for novel, low-molecular mass cytoprotective agents.
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Affiliation(s)
- A Tesmar
- Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, 80-308 Gdańsk, Poland
| | - I Inkielewicz-Stępniak
- Department of Medical Chemistry, Medical University of Gdańsk, Dębinki 1, 80-211 Gdańsk, Poland
| | - A Sikorski
- Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, 80-308 Gdańsk, Poland
| | - D Wyrzykowski
- Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, 80-308 Gdańsk, Poland.
| | - D Jacewicz
- Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, 80-308 Gdańsk, Poland
| | - P Zięba
- Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, 80-308 Gdańsk, Poland
| | - J Pranczk
- Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, 80-308 Gdańsk, Poland
| | - T Ossowski
- Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, 80-308 Gdańsk, Poland
| | - L Chmurzyński
- Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, 80-308 Gdańsk, Poland
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Cis-[Cr(C2O4)(pm)(OH2)2]+ coordination ion as a specific sensing ion for H2O2 detection in HT22 cells. Molecules 2014; 19:8533-43. [PMID: 24959680 PMCID: PMC6271120 DOI: 10.3390/molecules19068533] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2014] [Revised: 05/30/2014] [Accepted: 06/10/2014] [Indexed: 01/19/2023] Open
Abstract
The purpose of this study was to examine the application of the coordinated cis-[Cr(C2O4)(pm)(OH)2]+ cation where pm denotes pyridoxamine, as a specific sensing ion for the detection of hydrogen peroxide (H2O2). The proposed method for H2O2 detection includes two key steps. The first step is based on the nonenzymatic decarboxylation of pyruvate upon reaction with H2O2, while the second step is based on the interaction of cis-[Cr(C2O4)(pm)(OH2)2]+ with the CO2 released in the previous step. Using this method H2O2 generated during glutamate-induced oxidative stress was detected in HT22 hippocampal cells. The coordination ion cis-[Cr(C2O4)(pm)(OH2)2]+ and the spectrophotometric stopped-flow technique were applied to determine the CO2 concentration in cell lysates, supernatants and cell-free culture medium. Prior to CO2 assessment pyruvate was added to all samples studied. Pyruvate reacts with H2O2 with 1:1 stoichiometry, and consequently the amount of CO2 released in this reaction is equivalent to the amount of H2O2.
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11
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Recent advances in the investigation of pancreatic inflammation induced by large doses of basic amino acids in rodents. J Transl Med 2014; 94:138-49. [PMID: 24365745 DOI: 10.1038/labinvest.2013.143] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2013] [Revised: 11/13/2013] [Accepted: 11/19/2013] [Indexed: 12/16/2022] Open
Abstract
It has been known for approximately 30 years that large doses of the semi-essential basic amino acid L-arginine induce severe pancreatic inflammation in rats. Recently, it has been demonstrated that L-arginine can also induce pancreatitis in mice. Moreover, other basic amino acids like L-ornithine and L-lysine can cause exocrine pancreatic damage without affecting the endocrine parenchyma and the ducts in rats. The utilization of these noninvasive severe basic amino acid-induced pancreatitis models is becoming increasingly popular and appreciated as these models nicely reproduce most laboratory and morphological features of human pancreatitis. Consequently, the investigation of basic amino acid-induced pancreatitis may offer us a better understanding of the pathogenesis and possible treatment options of the human disease.
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Ning W, Wang Y, Zhang F, Wang H, Wang F, Wang X, Tang H, Liang S, Shi X, Liu Z. Beneficial effects of trypsin inhibitors derived from a spider venom peptide in L-arginine-induced severe acute pancreatitis in mice. PLoS One 2013; 8:e61049. [PMID: 23613780 PMCID: PMC3626702 DOI: 10.1371/journal.pone.0061049] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2012] [Accepted: 03/05/2013] [Indexed: 12/16/2022] Open
Abstract
HWTI is a 55-residue protein isolated from the venom of the spider Ornithoctonus huwena. It is a potent trypsin inhibitor and a moderate voltage-gated potassium channel blocker. Here, we designed and expressed two HWTI mutants, HWTI-mut1 and HWTI-mut2, in which the potassium channel inhibitory activity was reduced while the trypsin inhibitory activity of the wild type form (approximately 5 EPU/mg) was retained. Animal studies showed that these mutants were less toxic than HWTI. The effects of HWTI and HWTI-mut1 were examined in a mouse model of acute pancreatitis induced by intraperitoneal injection of a large dose of L-arginine (4 mg/kg, twice). Serum amylase and serum lipase activities were assessed, and pathological sections of the pancreas were examined. Treatment with HWTI and HWTI-mut1 significantly reduced serum amylase and lipase levels in a dose dependent manner. Compared with the control group, at 4 mg/kg, HWTI significantly reduced serum amylase level by 47% and serum lipase level by 73%, while HWTI-mut1 significantly reduced serum amylase level by 59% and serum lipase level by 72%. Moreover, HWTI and HWTI-mut1 effectively protected the pancreas from acinar cell damage and inflammatory cell infiltration. The trypsin inhibitory potency and lower neurotoxicity of HWTI-mut1 suggest that it could potentially be developed as a drug for the treatment of acute pancreatitis with few side effects.
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Affiliation(s)
- Weiwen Ning
- College of Life Sciences, Hunan Normal University, Changsha, Hunan, China
| | - Yongjun Wang
- Department of Digestion, the Second Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Fan Zhang
- College of Life Sciences, Hunan Normal University, Changsha, Hunan, China
| | - Hengyun Wang
- College of Life Sciences, Hunan Normal University, Changsha, Hunan, China
| | - Fan Wang
- College of Life Sciences, Hunan Normal University, Changsha, Hunan, China
| | - Xiaojuan Wang
- College of Life Sciences, Hunan Normal University, Changsha, Hunan, China
| | - Huaxin Tang
- College of Life Sciences, Hunan Normal University, Changsha, Hunan, China
| | - Songping Liang
- College of Life Sciences, Hunan Normal University, Changsha, Hunan, China
| | - Xiaoliu Shi
- Department of Digestion, the Second Xiangya Hospital, Central South University, Changsha, Hunan, China
- * E-mail: (XS); (ZL)
| | - Zhonghua Liu
- College of Life Sciences, Hunan Normal University, Changsha, Hunan, China
- * E-mail: (XS); (ZL)
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Żamojć K, Jacewicz D, Chmurzyński L. Quenching of Fluorescence of Polycyclic Aromatic Hydrocarbons by 4-OH-TEMPO. ANAL LETT 2013. [DOI: 10.1080/00032719.2012.718830] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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14
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Jacewicz D, Dąbrowska A, Chmurzyński L. Stopped-flow spectrophotometric study of the kinetics and mechanism of CO₂ uptake by cis-[Cr(C₂O₄)(BaraNH₂)(OH₂)₂]+ cation and the acid-catalyzed decomposition of cis-[Cr(C₂O₄)(BaraNH₂)OCO₂]- anion in aqueous solution. Molecules 2011; 16:7746-61. [PMID: 21909058 PMCID: PMC6264133 DOI: 10.3390/molecules16097746] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2011] [Revised: 09/01/2011] [Accepted: 09/06/2011] [Indexed: 11/30/2022] Open
Abstract
The kinetics of CO2 uptake by the cis-[Cr(C2O4)(BaraNH2)(OH2)2]+ complex cation and the acid hydrolysis of the cis-[Cr(C2O4)(BaraNH2)OCO2]− complex anion (where BaraNH2 denotes methyl 3-amino-2,3-dideoxy-β-D-arabino-hexopyranoside) were studied using the stopped-flow technique. The reactions under study were investigated in aqueous solution in the 288–308 K temperature range. In the case of the reaction between CO2 and cis-[Cr(C2O4)(BaraNH2)(OH2)2]+ cation variable pH values (6.82–8.91) and the constant ionic strength of solution (H+, Na+, ClO4− = 1.0) were used. Carbon dioxide was generated by the reaction between sodium pyruvate and hydrogen peroxide. The acid hydrolysis of cis-[Cr(C2O4)(BaraNH2)OCO2]− was investigated for varying concentrations of H+ ions (0.01–2.7 M). The obtained results enabled the determination of the number of steps of the studied reactions. Based on the kinetic equations, rate constants were determined for each step. Finally, mechanisms for both reactions were proposed and discussed. Based on the obtained results it was concluded that the carboxylation (CO2 uptake) reactions of cis-[Cr(C2O4)(BaraNH2)(OH2)2]+ and the decarboxylation (acid hydrolysis) of the cis-[Cr(C2O4)(BaraNH2)OCO2]−are the opposite of each other.
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Affiliation(s)
- Dagmara Jacewicz
- Department of General and Inorganic Chemistry, University of Gdańsk, Sobieskiego 18/19, 80-952 Gdańsk, Poland.
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