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Characterization of radicals in polysorbate 80 using electron paramagnetic resonance (EPR) spectroscopy and spin trapping. Int J Pharm X 2022; 4:100123. [PMID: 35795322 PMCID: PMC9251573 DOI: 10.1016/j.ijpx.2022.100123] [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: 06/20/2022] [Accepted: 06/21/2022] [Indexed: 11/21/2022] Open
Abstract
Polysorbates are an important class of nonionic surfactants that are widely used to stabilize biopharmaceuticals. The degradation of polysorbate 20 and 80 and the related particle formation in biologics are heavily discussed in the pharmaceutical community. Although a lot of experimental effort was spent in the detailed study of potential degradation pathways, the underlying mechanisms are only sparsely understood. Besides enzymatic hydrolysis, another proposed mechanism is associated with radical-induced (auto)oxidation of polysorbates. To characterize the types and the origin of the involved radicals and their propagation in bulk material as well as in diluted polysorbate 80 solutions, we applied electron paramagnetic resonance (EPR) spectroscopy using a spin trapping approach. The prerequisite for a meaningful experiment using spin traps is an understanding of the trapping rate, which is an interplay of (i) the presence of the spin trap at the scene of action, (ii) the specific reactivity of the selected spin trap with a certain radical as well as (iii) the stability of the formed spin adducts (a slow decay rate). We discuss whether and to which extent these criteria are fulfilled regarding the identification of different radical classes that might be involved in polysorbate oxidative degradation processes. The ratio of different radicals for different scenarios was determined for various polysorbate 80 quality grades in bulk material and in aqueous solution, showing differences in the ratio of present radicals. Possible correlations between the radical content and product parameters such as the quality grade, the manufacturing date, the manufacturer, the initial peroxide content according to the certificate of analysis of polysorbate 80 are discussed.
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Huang Y, Yu L, Lu P, Wei Y, Fu L, Hou J, Wang Y, Wang X, Chen L. Evaluate the bisphenol A-induced redox state in cells, zebrafish and in vivo with a hydrogen peroxide turn-on fluorescent probe. JOURNAL OF HAZARDOUS MATERIALS 2022; 424:127425. [PMID: 34634705 DOI: 10.1016/j.jhazmat.2021.127425] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Revised: 09/15/2021] [Accepted: 10/01/2021] [Indexed: 06/13/2023]
Abstract
Hydrogen peroxide (H2O2) is an important active oxygen species that plays a major role in redox balance and in physiological and pathological processes of various diseases of biological systems. As H2O2 is an endogenous active molecule, fluctuations in H2O2 content are not only affected by the state of biological system itself but also easily affected by Bisphenol A (BPA, a typical estrogenic environmental pollutant) in the external environment. Here, the near-infrared fluorescent probe Cy-NOH2 (λem = 750 nm) as a tool was synthesized to detect fluctuations in H2O2 content in cells and organisms induced by BPA. High sensitivity and excellent selectivity were found when the probe Cy-NOH2 was used to monitor endogenous H2O2 in vitro. In addition, the expression of H2O2 induced by different concentrations of BPA was able to be detected by the probe. Zebrafish and mice models were induced with different concentrations of BPA, and the H2O2 content showed significant increasing trends in zebrafish and livers of mice with increasing BPA concentrations. This study reveals that the probe Cy-NOH2 can be used as an effective tool to monitor the redox state in vivo under the influence of BPA, which provides a basis for clarifying the mechanisms of BPA in a variety of physiological and pathological processes.
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Affiliation(s)
- Yan Huang
- School of Pharmacy, Binzhou Medical University, Yantai 264003, China
| | - Lei Yu
- Shandong Peninsula Engineering Research Center of Comprehensive Brine Utilization, Weifang University of Science and Technology, Weifang 262700, China
| | - Pengpeng Lu
- School of Pharmacy, Binzhou Medical University, Yantai 264003, China
| | - Yinghui Wei
- Department of Respiratory Medicine, Binzhou Medical University Hospital, Binzhou 256603, China
| | - Lili Fu
- School of Pharmacy, Binzhou Medical University, Yantai 264003, China
| | - Junjun Hou
- Department of Respiratory Medicine, Binzhou Medical University Hospital, Binzhou 256603, China
| | - Yunqing Wang
- CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Shandong Key Laboratory of Coastal Environmental Processes, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003,China; Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China
| | - Xiaoyan Wang
- School of Pharmacy, Binzhou Medical University, Yantai 264003, China; CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Shandong Key Laboratory of Coastal Environmental Processes, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003,China.
| | - Lingxin Chen
- School of Pharmacy, Binzhou Medical University, Yantai 264003, China; CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Shandong Key Laboratory of Coastal Environmental Processes, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003,China; Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China.
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Electrochemical deposition of nickel from aqueous electrolytic baths prepared by dissolution of metallic powder. J Solid State Electrochem 2021. [DOI: 10.1007/s10008-021-05084-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
AbstractA new method of preparation of aqueous electrolyte baths for electrochemical deposition of nickel targets for medical accelerators is presented. It starts with fast dissolution of metallic Ni powder in a HNO3-free solvent. Such obtained raw solution does not require additional treatment aimed to removal nitrates, such as the acid evaporation and Ni salt precipitation-dissolution. It is used directly for preparation of the nickel plating baths after dilution with water, setting up pH value and after possible addition of H3BO3. The pH of the baths ranges from alkaline to acidic. Deposition of 95% of ca. 50 mg of Ni dissolved in the bath takes ca. 3.5 h for the alkaline electrolyte while for the acidic solution it requires ca. 7 h. The Ni deposits obtained from the acidic bath are physically and chemically more stable and possess smoother and crack-free surfaces as compared to the coatings deposited from the alkaline bath. A method of estimation of concentration of H2O2 in the electrolytic bath is also proposed.
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Dmitrieva SA, Ponomareva AA, Gurjanov OP, Mazina AB, Andrianov VV, Iyudin VS, Minibayeva FV. Spermine Induces Autophagy in Plants: Possible Role of NO and Reactive Oxygen Species. DOKL BIOCHEM BIOPHYS 2019; 483:341-343. [PMID: 30607735 DOI: 10.1134/s1607672918060121] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2018] [Indexed: 11/23/2022]
Abstract
This is the first study to show that polyamine spermine, a low-molecular-weight nitrogen-containing compound, can induce autophagy in plants. This process is accompanied by an increased generation of reactive oxygen species and nitric oxide, which play a signal role and are required for triggering autophagy.
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Affiliation(s)
- S A Dmitrieva
- Kazan Institute of Biochemistry and Biophysics, Federal Research Center "Kazan Scientific Center of the Russian Academy of Sciences,", Kazan, 420111, Tatarstan, Russia
| | - A A Ponomareva
- Kazan Institute of Biochemistry and Biophysics, Federal Research Center "Kazan Scientific Center of the Russian Academy of Sciences,", Kazan, 420111, Tatarstan, Russia
| | - O P Gurjanov
- Kazan Institute of Biochemistry and Biophysics, Federal Research Center "Kazan Scientific Center of the Russian Academy of Sciences,", Kazan, 420111, Tatarstan, Russia
| | - A B Mazina
- Kazan Institute of Biochemistry and Biophysics, Federal Research Center "Kazan Scientific Center of the Russian Academy of Sciences,", Kazan, 420111, Tatarstan, Russia
| | - V V Andrianov
- Kazan Physical-Technical Institute, Federal Research Center "Kazan Scientific Center of the Russian Academy of Sciences,", Kazan, 420029, Tatarstan, Russia
| | - V S Iyudin
- Kazan Physical-Technical Institute, Federal Research Center "Kazan Scientific Center of the Russian Academy of Sciences,", Kazan, 420029, Tatarstan, Russia.,Kazan (Volga) Federal University, Kazan, 420008, Tatarstan, Russia
| | - F V Minibayeva
- Kazan Institute of Biochemistry and Biophysics, Federal Research Center "Kazan Scientific Center of the Russian Academy of Sciences,", Kazan, 420111, Tatarstan, Russia. .,Kazan (Volga) Federal University, Kazan, 420008, Tatarstan, Russia.
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EFFECT OF ORGANIC MICROELEMENTS IN LIPOSOMAL FORM ON FERTILIZING ABILITY AND THE LEVEL OF ANTIOXIDANT REACTIONS OF FEMALE RABBITS. BIOTECHNOLOGIA ACTA 2018. [DOI: 10.15407/biotech11.04.050] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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Liu Z, Liu Y, Xu Q, Peng H, Tang Y, Yang T, Yu Z, Cheng G, Zhang G, Shi R. Critical role of vascular peroxidase 1 in regulating endothelial nitric oxide synthase. Redox Biol 2017; 12:226-232. [PMID: 28264790 PMCID: PMC5338721 DOI: 10.1016/j.redox.2017.02.022] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2017] [Accepted: 02/26/2017] [Indexed: 12/19/2022] Open
Abstract
Vascular peroxidase 1 (VPO1) is a member of the peroxidase family which aggravates oxidative stress by producing hypochlorous acid (HOCl). Our previous study demonstrated that VPO1 plays a critical role in endothelial dysfunction through dimethylarginine dimethylaminohydrolase2 (DDAH2)/asymmetric Dimethylarginine (ADMA) pathway. Hereby we describe the regulatory role of VPO1 on endothelial nitric oxide synthase (eNOS) expression and activity in human umbilical vein endothelial cells (HUVECs). In HUVECs AngiotensinII (100 nM) treatment reduced Nitric Oxide (NO) production, decreased eNOS expression and activity, which were reversed by VPO1 siRNA. Knockdown of VPO1 also attenuated ADMA production and eNOS uncoupling while enhancing phosphorylated ser1177 eNOS expression level. Furthermore, HOCl stimulation was shown to directly induce ADMA production and eNOS uncoupling, decrease phosphorylated ser1177 eNOS expression. It also significantly suppressed eNOS expression and activity together with NO production. Therefore, VPO1 plays a vital role in regulating eNOS expression and activity via hydrogen peroxide (H2O2)-VPO1-HOCl pathway. Angiotensin II decreased eNOS expression and activity in HUVECs. VPO1 plays an important role in regulating eNOS expression and activity in HUVECs. VPO1 regulates eNOS expression and activity through VPO1/H2O2/HOCl pathway.
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Affiliation(s)
- Zhaoya Liu
- Department of Cardiovascular Medicine, Xiangya Hospital, Central South University, Changsha 410008, China
| | - Yanbo Liu
- Department of Cardiovascular Medicine, Xiangya Hospital, Central South University, Changsha 410008, China
| | - Qian Xu
- Department of Cardiovascular Medicine, Xiangya Hospital, Central South University, Changsha 410008, China
| | - Haiyang Peng
- Department of Cardiovascular Medicine, Xiangya Hospital, Central South University, Changsha 410008, China
| | - Yixin Tang
- Department of Cardiovascular Medicine, Xiangya Hospital, Central South University, Changsha 410008, China
| | - Tianlun Yang
- Department of Cardiovascular Medicine, Xiangya Hospital, Central South University, Changsha 410008, China
| | - Zaixin Yu
- Department of Cardiovascular Medicine, Xiangya Hospital, Central South University, Changsha 410008, China
| | - Guangjie Cheng
- Division of Pulmonary, Allergy & Critical Care Medicine, Department of Medicine, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Guogang Zhang
- Department of Cardiovascular Medicine, Xiangya Hospital, Central South University, Changsha 410008, China.
| | - Ruizheng Shi
- Department of Cardiovascular Medicine, Xiangya Hospital, Central South University, Changsha 410008, China.
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Peterson BF, Scharf ME. Metatranscriptome analysis reveals bacterial symbiont contributions to lower termite physiology and potential immune functions. BMC Genomics 2016; 17:772. [PMID: 27716053 PMCID: PMC5045658 DOI: 10.1186/s12864-016-3126-z] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2016] [Accepted: 09/26/2016] [Indexed: 02/03/2023] Open
Abstract
BACKGROUND Symbioses throughout the animal kingdom are known to extend physiological and ecological capabilities to hosts. Insect-microbe associations are extremely common and are often related to novel niche exploitation, fitness advantages, and even speciation events. These phenomena include expansions in host diet, detoxification of insecticides and toxins, and increased defense against pathogens. However, dissecting the contributions of individual groups of symbionts at the molecular level is often underexplored due to methodological and analytical limitations. Termites are one of the best studied systems for physiological collaborations between host and symbiota; however, most work in lower termites (those with bacterial and protist symbionts) focuses on the eukaryotic members of this symbiotic consortium. Here we present a metatranscriptomic analysis which provides novel insights into bacterial contributions to the holobiont of the eastern subterranean termite, Reticulitermes flavipes, in the presence and absence of a fungal pathogen. RESULTS Using a customized ribodepletion strategy, a metatranscriptome assembly was obtained representing the host termite as well as bacterial and protist symbiota. Sequence data provide new insights into biosynthesis, catabolism, and transport of major organic molecules and ions by the gut consortium, and corroborate previous findings suggesting that bacteria play direct roles in nitrogen fixation, amino acid biosynthesis, and lignocellulose digestion. With regard to fungal pathogen challenge, a total of 563 differentially expressed candidate host and symbiont contigs were identified (162 up- and 401 downregulated; α/FDR = 0.05) including an upregulated bacterial amidohydrolase. CONCLUSIONS This study presents the most complete bacterial metatranscriptome from a lower termite and provides a framework on which to build a more complete model of termite-symbiont interactions including, but not limited to, digestion and pathogen defense.
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Affiliation(s)
- Brittany F Peterson
- Department of Entomology, Purdue University, 901 W. State St, West Lafayette, IN, 47907-2089, USA. .,Present address: Center for Insect Science, University of Arizona, 1007 E. Lowell St, Tucson, AZ, 85721, USA.
| | - Michael E Scharf
- Department of Entomology, Purdue University, 901 W. State St, West Lafayette, IN, 47907-2089, USA
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Hyperglycemia Promotes the Epithelial-Mesenchymal Transition of Pancreatic Cancer via Hydrogen Peroxide. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2016; 2016:5190314. [PMID: 27433288 PMCID: PMC4940572 DOI: 10.1155/2016/5190314] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/14/2016] [Revised: 04/15/2016] [Accepted: 04/21/2016] [Indexed: 12/13/2022]
Abstract
Diabetes mellitus (DM) and pancreatic cancer are intimately related, as approximately 85% of patients diagnosed with pancreatic cancer have impaired glucose tolerance or even DM. Our previous studies have indicated that high glucose could promote the invasive and migratory abilities of pancreatic cancer cells. We therefore explored the underlying mechanism that hyperglycemia modulates the metastatic potential of pancreatic cancer. Our data showed that streptozotocin- (STZ-) treated diabetic nude mice exhibit larger tumor size than that of the euglycemic mice. The number of nude mice that develop liver metastasis or ascites is much more in the STZ-treated group than that in the euglycemic group. Hyperglycemic mice contain a higher plasma H2O2-level than that from euglycemic mice. The injection of polyethylene glycol-conjugated catalase (PEG-CAT), an H2O2 scavenger, may reverse hyperglycemia-induced tumor metastasis. In addition, hyperglycemia could also modulate the expression of epithelial-mesenchymal transition- (EMT-) related factors in pancreatic tumor tissues, as the E-cadherin level is decreased and the expression of mesenchymal markers N-cadherin and vimentin as well as transcription factor snail is strongly increased. The injection of PEG-CAT could also reverse hyperglycemia-induced EMT. These results suggest that the association between hyperglycemia and poor prognosis of pancreatic cancer can be attributed to the alterations of EMT through the production of hydrogen peroxide.
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Shen Y, Miao NJ, Xu JL, Gan XX, Xu D, Zhou L, Xue H, Zhang W, Lu LM. N-acetylcysteine alleviates angiotensin II-mediated renal fibrosis in mouse obstructed kidneys. Acta Pharmacol Sin 2016; 37:637-44. [PMID: 27041464 DOI: 10.1038/aps.2016.12] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2015] [Accepted: 01/12/2016] [Indexed: 12/14/2022] Open
Abstract
AIM To investigate the effects of ROS scavenger N-acetylcysteine (NAC) on angiotensin II (Ang II)-mediated renal fibrosis in vivo and in vitro. METHODS Mice were subjected to unilateral ureteral obstruction (UUO), and then treated with vehicle or NAC (250 mg/kg, ip) for 7 days. Histological changes of the obstructed kidneys were observed with Masson's trichrome staining. ROS levels were detected with DHE staining. The expression of relevant proteins in the obstructed kidneys was assessed using Western blotting assays. Cultured rat renal fibroblast NRK-49F cells were used for in vitro experiments. RESULTS In the obstructed kidneys, Ang II levels were significantly elevated, and collagen I was accumulated in the interstitial spaces. Furthermore, ROS production and the expression of p47 (a key subunit of NADPH oxidase complexes) were increased in a time-dependent manner; the expression of fibronectin, α-SMA and TGF-β were upregulated. Administration of NAC significantly alleviated the fibrotic responses in the obstructed kidneys. In cultured NRK-49F cells, treatment with Ang II (0.001-10 μmol/L) increased the expression of fibronectin, collagen I, α-SMA and TGF-β in dose-dependent and time-dependent manners. Ang II also increased ROS production and the phosphorylation of Smad3. Pretreatment with NAC (5 μmol/L) blocked Ang II-induced oxidative stress and ECM production in the cells. CONCLUSION In mouse obstructed kidneys, the fibrotic responses result from Ang II upregulation can be alleviated by the ROS scavenger N-acetylcysteine.
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Shakirzyanova A, Valeeva G, Giniatullin A, Naumenko N, Fulle S, Akulov A, Atalay M, Nikolsky E, Giniatullin R. Age-dependent action of reactive oxygen species on transmitter release in mammalian neuromuscular junctions. Neurobiol Aging 2016; 38:73-81. [DOI: 10.1016/j.neurobiolaging.2015.10.023] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2015] [Revised: 10/13/2015] [Accepted: 10/26/2015] [Indexed: 01/01/2023]
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Odnoshivkina UG, Sytchev VI, Nurullin LF, Giniatullin AR, Zefirov AL, Petrov AM. β2-adrenoceptor agonist-evoked reactive oxygen species generation in mouse atria: implication in delayed inotropic effect. Eur J Pharmacol 2015; 765:140-53. [PMID: 26297975 DOI: 10.1016/j.ejphar.2015.08.020] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2015] [Revised: 08/05/2015] [Accepted: 08/17/2015] [Indexed: 12/20/2022]
Abstract
Fenoterol, a β2-adrenoceptor agonist, has anti-apoptotic action in cardiomyocytes and induces a specific pattern of downstream signaling. We have previously reported that exposure to fenoterol (5 μM) results in a delayed positive inotropic effect which is related to changes in both Ca2+ transient and NO. Here, the changes in reactive oxygen species (ROS) production in response to the fenoterol administration and the involvement of ROS in effect of this agonist on contractility were investigated in mouse isolated atria. Stimulation of β2-adrenoceptor increases a level of extracellular ROS, while intracellular ROS level rises only after removal of fenoterol from the bath. NADPH-oxidase inhibitor (apocynin) prevents the increase in ROS production and the Nox2 isoform is immunofluorescently colocalized with β2-adrenoceptor at the atrial myocytes. Treatments with antioxidants (N-acetyl-L-cysteine, NADPH inhibitors, exogenous catalases) significantly inhibit the fenoterol induced increase in the contraction amplitude, probably by attenuating Ca2+ transient and up-regulating NO production. ROS generated in a β2-adrenoceptor-dependent manner can potentiate the activity of some Ca2+ channels. Indeed, inhibition of ryanodine receptors, TRPV-or L-type Ca2+- channels shows a similar efficacy in reduction of positive inotropic effect of both fenoterol and H2O2. In addition, detection of mitochondrial ROS indicates that fenoterol triggers a slow increase in ROS which is prevented by rotenone, but rotenone has no impact on the inotropic effect of fenoterol. We suggest that stimulation of β2-adrenoceptor with fenoterol causes the activation of NADPH-oxidase and after the agonist removal extracellularly generated ROS penetrates into the cell, increasing the atrial contractions probably via Ca2+ channels.
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Affiliation(s)
- Ulia G Odnoshivkina
- Department of Normal Physiology, Kazan State Medical University, Butlerova st., 49, Kazan 420012, Russia
| | - Vaycheslav I Sytchev
- Department of Normal Physiology, Kazan State Medical University, Butlerova st., 49, Kazan 420012, Russia
| | - Leniz F Nurullin
- Kazan Institute of Biochemistry and Biophysics, Kazan Scientific Center of Russian Academy of Sciences, Laboratory of Biophysics of Synaptic Processes, Lobatchevsky str. 2/31, P.O. 30, Kazan 420111, Russia
| | - Arthur R Giniatullin
- Department of Normal Physiology, Kazan State Medical University, Butlerova st., 49, Kazan 420012, Russia
| | - Andrei L Zefirov
- Department of Normal Physiology, Kazan State Medical University, Butlerova st., 49, Kazan 420012, Russia
| | - Alexey M Petrov
- Department of Normal Physiology, Kazan State Medical University, Butlerova st., 49, Kazan 420012, Russia.
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Zhang B, Niu W, Xu D, Li Y, Liu M, Wang Y, Luo Y, Zhao P, Liu Y, Dong M, Sun R, Dong H, Li Z. Oxymatrine prevents hypoxia- and monocrotaline-induced pulmonary hypertension in rats. Free Radic Biol Med 2014; 69:198-207. [PMID: 24440469 DOI: 10.1016/j.freeradbiomed.2014.01.013] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/22/2013] [Revised: 01/07/2014] [Accepted: 01/08/2014] [Indexed: 02/02/2023]
Abstract
Pulmonary hypertension is a progressive disease characterized by marked pulmonary arterial remodeling and increased vascular resistance. Inflammation and oxidative stress promote the development of pulmonary hypertension. Oxymatrine, one of the main active components of the Chinese herb Sophora flavescens Ait. (Kushen), plays anti-inflammatory and antioxidant protective roles, which effects on pulmonary arteries remain unclear. This study aimed to investigate the effects of oxymatrine on pulmonary hypertension development. Sprague-Dawley rats were exposed to hypoxia for 28 days or injected with monocrotaline, to develop pulmonary hypertension, along with administration of oxymatrine (50mg/kg/day). Hemodynamics and pulmonary arterial remodeling data from the rats were then obtained. The antiproliferative effect of oxymatrine was verified by in vitro assays. The inflammatory cytokine mRNA levels and leukocyte and T cell accumulation in lung tissue were detected. The antioxidative effects of oxymatrine were explored in vitro. Our study shows that oxymatrine treatment attenuated right-ventricular systolic pressure and pulmonary arterial remodeling induced by hypoxia or monocrotaline and inhibited proliferation of pulmonary arterial smooth muscle cells (PASMCs). Increased expression of inflammatory cytokine mRNA and accumulation of leukocytes and T cells around the pulmonary arteries were suppressed with oxymatrine administration. Under hypoxic conditions, oxymatrine significantly upregulated Nrf2 and antioxidant protein SOD1 and HO-1 expression, but downregulated hydroperoxide levels in PASMCs. In summary, this study indicates that oxymatrine may prevent pulmonary hypertension through its antiproliferative, anti-inflammatory, and antioxidant effects, thus providing a promising pharmacological avenue for treating pulmonary hypertension.
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Affiliation(s)
- Bo Zhang
- Department of Pathology, Xijing Hospital and Department of Pathology and Pathophysiology, Fourth Military Medical University, Xi'an 710032, People's Republic of China.
| | - Wen Niu
- Department of Pathology, Xijing Hospital and Department of Pathology and Pathophysiology, Fourth Military Medical University, Xi'an 710032, People's Republic of China
| | - Dunquan Xu
- Department of Pathology, Xijing Hospital and Department of Pathology and Pathophysiology, Fourth Military Medical University, Xi'an 710032, People's Republic of China
| | - Yanyan Li
- Department of Pathology, Xijing Hospital and Department of Pathology and Pathophysiology, Fourth Military Medical University, Xi'an 710032, People's Republic of China
| | - Manling Liu
- Department of Pathology, Xijing Hospital and Department of Pathology and Pathophysiology, Fourth Military Medical University, Xi'an 710032, People's Republic of China
| | - Yanxia Wang
- Department of Pathology, Xijing Hospital and Department of Pathology and Pathophysiology, Fourth Military Medical University, Xi'an 710032, People's Republic of China
| | - Ying Luo
- Department of Pathology, Xijing Hospital and Department of Pathology and Pathophysiology, Fourth Military Medical University, Xi'an 710032, People's Republic of China
| | - Pengtao Zhao
- Department of Pathology, Xijing Hospital and Department of Pathology and Pathophysiology, Fourth Military Medical University, Xi'an 710032, People's Republic of China
| | - Yi Liu
- Department of Pathology, Xijing Hospital and Department of Pathology and Pathophysiology, Fourth Military Medical University, Xi'an 710032, People's Republic of China
| | - Mingqing Dong
- Department of Pathology, Xijing Hospital and Department of Pathology and Pathophysiology, Fourth Military Medical University, Xi'an 710032, People's Republic of China
| | - Rihe Sun
- Xi'an YiLe Bio-Tech Laboratory, Xi'an 710075, People's Republic of China
| | - Haiying Dong
- Department of Pathology, Xijing Hospital and Department of Pathology and Pathophysiology, Fourth Military Medical University, Xi'an 710032, People's Republic of China.
| | - Zhichao Li
- Department of Pathology, Xijing Hospital and Department of Pathology and Pathophysiology, Fourth Military Medical University, Xi'an 710032, People's Republic of China.
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Hoshino M, Kamino S, Doi M, Takada S, Mitani S, Yanagihara R, Asano M, Yamaguchi T, Fujita Y. Spectrophotometric determination of hydrogen peroxide with osmium(VIII) and m-carboxyphenylfluorone. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 117:814-816. [PMID: 24050957 DOI: 10.1016/j.saa.2013.08.048] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2013] [Accepted: 08/12/2013] [Indexed: 06/02/2023]
Abstract
Spectrophotometric determination of hydrogen peroxide was accomplished with osmium(VIII) and m-carboxyphenylfluorone (MCPF) in the presence of cetyltrimethylammonium chloride (CTAC). In the determination of hydrogen peroxide based on the fading of the color of osmium(VIII)-MCPF complex, Beer's law was obeyed in the range 20-406 ng mL(-1), with an effective molar absorption coefficient (at 580 nm) of 5.21×10(4) L mol(-1) cm(-1) and a relative standard deviation of 0.33% (n=6). Further, we performed the characterization of MCPF and obtained the crystal structure.
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Affiliation(s)
- Mitsuru Hoshino
- Osaka University of Pharmaceutical Sciences, Nasahara, Takatsuki, Osaka 569-1094, Japan.
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Expression of the laccase gene from a white rot fungus in Pichia pastoris can enhance the resistance of this yeast to H2O2-mediated oxidative stress by stimulating the glutathione-based antioxidative system. Appl Environ Microbiol 2012; 78:5845-54. [PMID: 22706050 DOI: 10.1128/aem.00218-12] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Laccase is a copper-containing polyphenol oxidase that has great potential in industrial and biotechnological applications. Previous research has suggested that fungal laccase may be involved in the defense against oxidative stress, but there is little direct evidence supporting this hypothesis, and the mechanism by which laccase protects cells from oxidative stress also remains unclear. Here, we report that the expression of the laccase gene from white rot fungus in Pichia pastoris can significantly enhance the resistance of yeast to H(2)O(2)-mediated oxidative stress. The expression of laccase in yeast was found to confer a strong ability to scavenge intracellular H(2)O(2) and to protect cells from lipid oxidative damage. The mechanism by which laccase gene expression increases resistance to oxidative stress was then investigated further. We found that laccase gene expression in Pichia pastoris could increase the level of glutathione-based antioxidative activity, including the intracellular glutathione levels and the enzymatic activity of glutathione peroxidase, glutathione reductase, and γ-glutamylcysteine synthetase. The transcription of the laccase gene in Pichia pastoris was found to be enhanced by the oxidative stress caused by exogenous H(2)O(2). The stimulation of laccase gene expression in response to exogenous H(2)O(2) stress further contributed to the transcriptional induction of the genes involved in the glutathione-dependent antioxidative system, including PpYAP1, PpGPX1, PpPMP20, PpGLR1, and PpGSH1. Taken together, these results suggest that the expression of the laccase gene in Pichia pastoris can enhance the resistance of yeast to H(2)O(2)-mediated oxidative stress by stimulating the glutathione-based antioxidative system to protect the cell from oxidative damage.
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15
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Kim IS, Kim YS, Yoon HS. Rice ASR1 protein with reactive oxygen species scavenging and chaperone-like activities enhances acquired tolerance to abiotic stresses in Saccharomyces cerevisiae. Mol Cells 2012; 33:285-93. [PMID: 22382682 PMCID: PMC3887699 DOI: 10.1007/s10059-012-2253-x] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2011] [Revised: 12/09/2011] [Accepted: 12/12/2011] [Indexed: 12/12/2022] Open
Abstract
Abscisic acid stress ripening (ASR1) protein is a small hydrophilic, low molecular weight, and stress-specific plant protein. The gene coding region of ASR1 protein, which is induced under high salinity in rice (Oryza sativa Ilmi), was cloned into a yeast expression vector pVTU260 and transformed into yeast cells. Heterologous expression of ASR1 protein in transgenic yeast cells improved tolerance to abiotic stresses including hydrogen peroxide (H(2)O(2)), high salinity (NaCl), heat shock, menadione, copper sulfate, sulfuric acid, lactic acid, salicylic acid, and also high concentration of ethanol. In particular, the expression of metabolic enzymes (Fba1p, Pgk1p, Eno2p, Tpi1p, and Adh1p), antioxidant enzyme (Ahp1p), molecular chaperone (Ssb1p), and pyrimidine biosynthesis-related enzyme (Ura1p) was up-regulated in the transgenic yeast cells under oxidative stress when compared with wild-type cells. All of these enzymes contribute to an alleviated redox state to H2O2-induced oxidative stress. In the in vitro assay, the purified ASR1 protein was able to scavenge ROS by converting H(2)O(2) to H(2)O. Taken together, these results suggest that the ASR1 protein could function as an effective ROS scavenger and its expression could enhance acquired tolerance of ROS-induced oxidative stress through induction of various cell rescue proteins in yeast cells.
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Affiliation(s)
- Il-Sup Kim
- Department of Biology, Kyungpook National University, Daegu 702-701,
Korea
| | - Young-Saeng Kim
- Department of Biology, Kyungpook National University, Daegu 702-701,
Korea
| | - Ho-Sung Yoon
- Department of Biology, Kyungpook National University, Daegu 702-701,
Korea
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Glutathione reductase from Brassica rapa affects tolerance and the redox state but not fermentation ability in response to oxidative stress in genetically modified Saccharomyces cerevisiae. World J Microbiol Biotechnol 2012; 28:1901-15. [PMID: 22806013 DOI: 10.1007/s11274-011-0988-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2011] [Accepted: 12/19/2011] [Indexed: 10/14/2022]
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Phospholipid peroxidation: lack of effect of fatty acid pairing. Lipids 2012; 47:451-60. [PMID: 22271423 DOI: 10.1007/s11745-012-3654-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2011] [Accepted: 12/19/2011] [Indexed: 11/30/2022]
Abstract
Phospholipids where both fatty acids are polyunsaturated are very rare. Most organisms prefer to couple their polyunsaturated fatty acids (PUFA) with either a saturated (SAT) or a monounsaturated (MUFA) fatty acid. This study examined if these natural couplings are there to protect PUFA from themselves. Specifically, does the coupling of PUFA to SAT or MUFA reduce the potential for increased rates of peroxidation by shrouding these highly peroxidisable fatty acids with less peroxidisable fatty acids? The influence of head group was examined by using the two most common phospholipids found in vertebrate membranes i.e. phosphatidylcholine and phosphatidylethanolamine species. Fatty acid pairings included 16:0/18:2 versus 18:2/18:2 and 16:0/22:6 versus 22:6/22:6. All phospholipids were incorporated into liposomes that were matched for their total PUFA content i.e. 25% PUFA/PUFA or 50% SAT/PUFA with phosphatidylcholine 16:0/16:0 used as the background phospholipid. An iron initiator (Fe²⁺/H₂O₂) was used to induce peroxidation and lipid hydroperoxide production was used to measure peroxidation. The results show that coupling of PUFA together on the same molecule does not increase peroxidation rates and therefore does not support the proposed hypothesis. The lower than expected levels of peroxidation measured for some phospholipid species (e.g. PtdEtn 22:6/22:6) is possibly due to the partitioning of these molecular species into the inner leaflet of the bilayer.
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Tsai YC, Wang YH, Liou CC, Lin YC, Huang H, Liu YC. Induction of Oxidative DNA Damage by Flavonoids of Propolis: Its Mechanism and Implication about Antioxidant Capacity. Chem Res Toxicol 2011; 25:191-6. [DOI: 10.1021/tx200418k] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Yi-Chih Tsai
- Institute
of Molecular Medicine and ‡Institute of Biotechnology, National Tsing-Hua University, Hsin-Chu, Taiwan 30013
| | - Yi-Hsiang Wang
- Institute
of Molecular Medicine and ‡Institute of Biotechnology, National Tsing-Hua University, Hsin-Chu, Taiwan 30013
| | - Chih-Chiang Liou
- Institute
of Molecular Medicine and ‡Institute of Biotechnology, National Tsing-Hua University, Hsin-Chu, Taiwan 30013
| | - Yu-Cun Lin
- Institute
of Molecular Medicine and ‡Institute of Biotechnology, National Tsing-Hua University, Hsin-Chu, Taiwan 30013
| | - Haimei Huang
- Institute
of Molecular Medicine and ‡Institute of Biotechnology, National Tsing-Hua University, Hsin-Chu, Taiwan 30013
| | - Yin-Chang Liu
- Institute
of Molecular Medicine and ‡Institute of Biotechnology, National Tsing-Hua University, Hsin-Chu, Taiwan 30013
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Wang L, Xu T, Lei WW, Liu DM, Li YJ, Xuan RJ, Ma JJ. Cadmium-induced oxidative stress and apoptotic changes in the testis of freshwater crab, Sinopotamon henanense. PLoS One 2011; 6:e27853. [PMID: 22132153 PMCID: PMC3222638 DOI: 10.1371/journal.pone.0027853] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2011] [Accepted: 10/26/2011] [Indexed: 11/30/2022] Open
Abstract
Cadmium (Cd), one of the most toxic environmental and industrial pollutants, is known to exert gonadotoxic and spermiotoxic effects. In the present study, we examined the toxic effect of Cd on the testis of freshwater crab, Sinopotamon henanense. Crabs were exposed to different Cd concentrations (from 0 to 116.00 mg·L(-1)) for 7 d. Oxidative stress and apoptotic changes in the testes were detected. The activities of SOD, GPx and CAT initially increased and subsequently decreased with increasing Cd concentrations, which was accompanied with the increase in malondialdehyde (MDA) and H(2)O(2) content in a concentration-dependent manner. Typical morphological characteristic and physiological changes of apoptosis were observed using a variety of methods (HE staining, AO/EB double fluorescent staining, Transmission Electron Microscope observation and DNA fragmentation analysis), and the activities of caspase-3 and caspase-9 were increased in a concentration-dependent manner after Cd exposure. These results led to the conclusion that Cd could induced oxidative damage as well as apoptosis in the testis, and the apoptotic processes may be mediated via mitochondria-dependent apoptosis pathway by regulating the activities of caspase-3 and caspase-9.
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Affiliation(s)
- Lan Wang
- School of Life Science, Shanxi University, Taiyuan, People's Republic of China.
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20
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Yang F, Svensson B, Finnie C. Response of germinating barley seeds to Fusarium graminearum: The first molecular insight into Fusarium seedling blight. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2011; 49:1362-1368. [PMID: 21798752 DOI: 10.1016/j.plaphy.2011.07.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2011] [Accepted: 07/11/2011] [Indexed: 05/31/2023]
Abstract
Fusarium seedling blight in cereals can result in significant reductions in plant establishment but has not received much attention. The disease often starts during seed germination due to sowing of the seeds infected by Fusarium spp. including Fusarium graminearum. In order to gain the first molecular insights into the response of the germinating barley seeds to F. graminearum for controlling the disease, germinating seeds were treated with water as control or inoculated with F. graminearum conidia and samples were harvested at 1, 2 and 3 days after inoculation (dai). Although germination rates were not significantly different between F. graminearum-inoculated and control samples, albumins and hydrogen peroxide were accumulated in the inoculated samples at 1-3 dai, indicating that there was an interaction between the germinating seeds and F. graminearum. Subsequently, a gel-based proteomic approach was employed to identify differentially expressed proteins in the seeds responding to fungal infection at 3 dai, which revealed 42 protein spots, 41 of which were identified by mass spectrometry. The up-regulated proteins mainly included heat shock proteins, antioxidant enzymes and the proteins involved in primary metabolism and detoxification whereas the majority of down-regulated proteins were plant protease inhibitors. The results suggest that there is a link between increased energy metabolism and oxidative stress in the germinating barley seeds in response to F. graminearum infection, which provides the first molecular insight into Fusarium seedling blight.
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Affiliation(s)
- Fen Yang
- Enzyme and Protein Chemistry, Department of Systems Biology, Technical University of Denmark, Denmark.
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21
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Shi R, Hu C, Yuan Q, Yang T, Peng J, Li Y, Bai Y, Cao Z, Cheng G, Zhang G. Involvement of vascular peroxidase 1 in angiotensin II-induced vascular smooth muscle cell proliferation. Cardiovasc Res 2011; 91:27-36. [PMID: 21292788 PMCID: PMC3112017 DOI: 10.1093/cvr/cvr042] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/05/2010] [Revised: 01/31/2011] [Accepted: 02/01/2011] [Indexed: 11/15/2022] Open
Abstract
AIMS Vascular peroxidase 1 (VPO1) is a newly identified haem-containing peroxidase that catalyses the oxidation of a variety of substrates by hydrogen peroxide (H(2)O(2)). Considering the well-defined effects of H(2)O(2) on the vascular remodelling during hypertension, and that VPO1 can utilize H(2)O(2) generated from co-expressed NADPH oxidases to catalyse peroxidative reactions, the aims of this study were to determine the potential role of VPO1 in vascular remodelling during hypertension. METHODS AND RESULTS The vascular morphology and the expression of VPO1 in arterial tissues of spontaneously hypertensive rats and Wistar-Kyoto rats were assessed. The VPO1 expression was significantly increased concomitantly with definite vascular remodelling assessed by evaluating the media thickness, lumen diameter, media thickness-to-lumen diameter ratio and mean nuclear area in artery media in spontaneously hypertensive rats. In addition, in cultured rat aortic smooth muscle cells we found that the angiotensin II-mediated cell proliferation was inhibited by knockdown of VPO1 using small hairpin RNA. Moreover, the NADPH oxidase inhibitor, apocynin, and the hydrogen peroxide scavenger, catalase, but not the ERK1/2 inhibitor, PD98059, attenuated angiotensin II-mediated up-regulation of VPO1 and generation of hypochlorous acid. CONCLUSION VPO1 is a novel regulator of vascular smooth muscle cell proliferation via NADPH oxidase-H(2)O(2)-VPO1-hypochlorous acid-ERK1/2 pathways, which may contribute to vascular remodelling in hypertension.
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MESH Headings
- Analysis of Variance
- Angiotensin II/metabolism
- Animals
- Aorta, Thoracic/enzymology
- Aorta, Thoracic/pathology
- Cell Proliferation/drug effects
- Cells, Cultured
- Disease Models, Animal
- Enzyme Activation
- Enzyme Inhibitors/pharmacology
- Extracellular Matrix Proteins/genetics
- Extracellular Matrix Proteins/metabolism
- Free Radical Scavengers/pharmacology
- Hydrogen Peroxide/metabolism
- Hypertension/enzymology
- Hypertension/pathology
- Hypochlorous Acid/metabolism
- Male
- Mesenteric Arteries/enzymology
- Mesenteric Arteries/pathology
- Mitogen-Activated Protein Kinase 1/antagonists & inhibitors
- Mitogen-Activated Protein Kinase 1/metabolism
- Mitogen-Activated Protein Kinase 3/antagonists & inhibitors
- Mitogen-Activated Protein Kinase 3/metabolism
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/enzymology
- Muscle, Smooth, Vascular/pathology
- Myocytes, Smooth Muscle/drug effects
- Myocytes, Smooth Muscle/enzymology
- Myocytes, Smooth Muscle/pathology
- NADPH Oxidases/antagonists & inhibitors
- NADPH Oxidases/metabolism
- Peroxidase/genetics
- Peroxidase/metabolism
- RNA Interference
- RNA, Messenger/metabolism
- Rats
- Rats, Inbred SHR
- Rats, Inbred WKY
- Signal Transduction
- Time Factors
- Peroxidasin
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Affiliation(s)
- Ruizheng Shi
- Department of Cardiovascular Medicine, Xiangya Hospital, Central South University, Changsha 410008, China
| | - Changping Hu
- Department of Pharmacology, School of Pharmaceutical Sciences, Central South University, Changsha 410078, China
| | - Qiong Yuan
- Department of Pharmacology, School of Pharmaceutical Sciences, Central South University, Changsha 410078, China
| | - Tianlun Yang
- Department of Cardiovascular Medicine, Xiangya Hospital, Central South University, Changsha 410008, China
| | - Jun Peng
- Department of Pharmacology, School of Pharmaceutical Sciences, Central South University, Changsha 410078, China
| | - Yuanjian Li
- Department of Pharmacology, School of Pharmaceutical Sciences, Central South University, Changsha 410078, China
| | - Yongping Bai
- Department of Cardiovascular Medicine, Xiangya Hospital, Central South University, Changsha 410008, China
| | - Zehong Cao
- Division of Pulmonary, Allergy & Critical Care Medicine, Department of Medicine, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Guangjie Cheng
- Division of Pulmonary, Allergy & Critical Care Medicine, Department of Medicine, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Guogang Zhang
- Department of Cardiovascular Medicine, Xiangya Hospital, Central South University, Changsha 410008, China
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Hu L, Liang W, Yin C, Cui X, Zong J, Wang X, Hu J, Zhang D. Rice MADS3 regulates ROS homeostasis during late anther development. THE PLANT CELL 2011; 23:515-33. [PMID: 21297036 PMCID: PMC3077785 DOI: 10.1105/tpc.110.074369] [Citation(s) in RCA: 200] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2010] [Revised: 01/06/2011] [Accepted: 01/19/2011] [Indexed: 05/17/2023]
Abstract
The rice (Oryza sativa) floral homeotic C-class gene, MADS3, was previously shown to be required for stamen identity determination during early flower development. Here, we describe a role for MADS3 in regulating late anther development and pollen formation. Consistent with this role, MADS3 is highly expressed in the tapetum and microspores during late anther development, and a newly identified MADS3 mutant allele, mads3-4, displays defective anther walls, aborted microspores, and complete male sterility. During late anther development, mads3-4 exhibits oxidative stress-related phenotypes. Microarray analysis revealed expression level changes in many genes in mads3-4 anthers. Some of these genes encode proteins involved in reactive oxygen species (ROS) homeostasis; among them is MT-1-4b, which encodes a type 1 small Cys-rich and metal binding protein. In vivo and in vitro assays showed that MADS3 is associated with the promoter of MT-1-4b, and recombinant MT-1-4b has superoxide anion and hydroxyl radical scavenging activity. Reducing the expression of MT-1-4b causes decreased pollen fertility and an increased level of superoxide anion in transgenic plants. Our findings suggest that MADS3 is a key transcriptional regulator that functions in rice male reproductive development, at least in part, by modulating ROS levels through MT-1-4b.
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Affiliation(s)
- Lifang Hu
- School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China
- Bio-X Research Center, Key Laboratory of Genetics and Development and Neuropsychiatric Diseases, Ministry of Education, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Wanqi Liang
- School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Changsong Yin
- School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Xiao Cui
- School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China
| | | | - Xing Wang
- School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Jianping Hu
- Department of Energy Plant Research Laboratory, Michigan State University, East Lansing, Michigan 48824
| | - Dabing Zhang
- School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China
- Bio-X Research Center, Key Laboratory of Genetics and Development and Neuropsychiatric Diseases, Ministry of Education, Shanghai Jiao Tong University, Shanghai 200240, China
- Address correspondence to
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Rachmilovich-Calis S, Masarwa A, Meyerstein N, Meyerstein D. The effect of pyrophosphate, tripolyphosphate and ATP on the rate of the Fenton reaction. J Inorg Biochem 2011; 105:669-74. [PMID: 21450270 DOI: 10.1016/j.jinorgbio.2011.01.009] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2010] [Revised: 01/05/2011] [Accepted: 01/10/2011] [Indexed: 10/18/2022]
Abstract
It has been recently reported that pyrophosphate, tri-polyphosphate, ATP and analogous ligands considerably decrease the yield of hydroxyl radicals by the Fenton reaction under conditions where [H(2)O(2)]>>[Fe(II)L(n)]. It was suggested that this effect is due to the slowing down of the Fenton reaction by these ligands. This suggestion seemed surprising as polyphosphate ligands stabilize Fe(III). Indeed, a kinetic study points out that these ligands accelerate the rate of the Fenton reaction by several orders of magnitude. Thus it is suggested that the effect of the ligands on the yield of the hydroxyl radicals is due to the stabilization of the Fe(III) complexes which slows down, or inhibits, their reduction by the radicals formed in the system and thus decreases the overall yield of hydroxyl radicals.
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24
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Kot M, Karcz W, Zaborska W. 5-Hydroxy-1,4-naphthoquinone (juglone) and 2-hydroxy-1,4-naphthoquinone (lawsone) influence on jack bean urease activity: Elucidation of the difference in inhibition activity. Bioorg Chem 2010; 38:132-7. [DOI: 10.1016/j.bioorg.2010.02.002] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2009] [Revised: 01/24/2010] [Accepted: 02/09/2010] [Indexed: 11/30/2022]
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25
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Nakahara R, Kashitani S, Hayakawa K, Kitani Y, Yamaguchi T, Fujita Y. Fluorophotometric determination of hydrogen peroxide with fluorescin in the presence of cobalt (II) and reaction against other reactive oxygen species. J Fluoresc 2009; 19:769-75. [PMID: 19255831 DOI: 10.1007/s10895-009-0473-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2008] [Accepted: 02/23/2009] [Indexed: 01/30/2023]
Abstract
A fluorophotometric method for the determination of hydrogen peroxide (H2O2) using fluorescin was developed. This method was based on the oxidative reaction of fluorescin, a colorless, non-fluorescent lactoid fluorescein, by H2O2 to give highly fluorescein fluorescence emission. In the determination of H2O2, the calibration curve exhibited linearity over the H2O2 concentration range of 1.5-310 ng mL(-1) at an emission wavelength of 525 nm with an excitation of 500 nm and with relative standard deviations (n = 6) of 2.51%, 2.48%, and 1.31% for 3.1 ng mL(-1), 30.8 ng mL(-1), and for 308 ng mL(-1) of H2O2, respectively. The detection limit for H2O2 was 1.9 ng mL(-1) six blank determinations was performed (rho = 6). This proposed method was applied to detection of other reactive oxygen species and nitrogen species (ROS/RNS) such as singlet oxygen (1O2), hydroxyl radical (*OH), peroxynitrite (ONOO-) etc., and it was possible to detect them with a high sensitivity. In addition, this proposed method was applied to the recovery tests of H2O2 in calf serum, human saliva, rain water, and wheat noodles; the results were satisfactory.
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Affiliation(s)
- Ryosuke Nakahara
- Department of Clinical Chemistry, Osaka University of Pharmaceutical Sciences, 4-20-1 Nasahara, Takatsuki, Osaka 569-1094, Japan.
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Serum uric acid levels correlate with plasma hydrogen peroxide and protein carbonyl levels in preeclampsia. Am J Hypertens 2008; 21:1343-6. [PMID: 18802427 DOI: 10.1038/ajh.2008.289] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
BACKGROUND Increased serum uric acid has been postulated to directly promote oxidative stress. The aim of this study was to investigate whether serum uric acid level correlated with superoxide generation and oxidative stress in preeclampsia. METHODS We assessed serum uric acid levels, plasma hydrogen peroxide levels, and plasma protein carbonyl levels in normal pregnant (n = 14) and preeclamptic women (n = 17). Serum uric acid and plasma hydrogen peroxide levels were determined by the uricase-peroxidase method, a combined enzymatic-colorimetric method. Plasma carbonyl levels were measured by ELISA. RESULTS The mean serum uric acid values were significantly elevated in preeclampsia (6.6 +/- 1.5 mg/dl) compared with normal pregnancy (4.0 +/- 0.7 mg/dl) (P < 0.001). Plasma protein carbonyl levels were also significantly elevated in preeclampsia (7.72 +/- 4.10 nmol/mg) compared with normal pregnancy (2.85 +/- 3.06 nmol/mg) (P = 0.0011). In addition, the plasma hydrogen peroxide levels were significantly higher in preeclampsia (66.9 +/- 10.9 micromol/l) compared with normal pregnancy (50.1 +/- 5.6 micromol/l) (P < 0.001). Serum uric acid levels correlated significantly and positively with plasma hydrogen peroxide levels (r(2) = 0.2965, P = 0.0027) and plasma protein carbonyl levels (r(2) = 0.2011, P = 0.0129). CONCLUSION The increased serum uric acid levels correlated closely with plasma hydrogen peroxide levels and plasma protein carbonyl levels in preeclampsia. Therefore, the serum uric acid level serves as an indicator of the underlying oxidative stress in preeclampsia.
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Nakahara R, Fujimoto T, Doi M, Morita K, Yamaguchi T, Fujita Y. Fluorophotometric determination of hydrogen peroxide and other reactive oxygen species with fluorescein hydrazide (FH) and its crystal structure. Chem Pharm Bull (Tokyo) 2008; 56:977-81. [PMID: 18591813 DOI: 10.1248/cpb.56.977] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Methods for the fluorophotometric determination of hydrogen peroxide (H(2)O(2)) and other reactive oxygen species (ROS) were proposed by using the fluorescence reaction between H(2)O(2) or other ROS and fluorescein hydrazide (FH). In the determination of H(2)O(2), the calibration curve exhibited linearity over the H(2)O(2) concentration range of 2.1-460 ng ml(-1) at an emission wavelength of 527 nm with an excitation of 460 nm and with the relative standard deviations (n=6) of 4.06%, 1.78%, and 2.21% for 3.1 ng ml(-1), 30.8 ng ml(-1), and for 308 ng ml(-1) of H(2)O(2), respectively. The detection limit for H(2)O(2) was 0.7 ng ml(-1) due to three blank determinations (rho=3). The calibration curves for ROS-related compounds were also constructed under the optimum conditions. This method was successfully applied in the assay of H(2)O(2) in human urine. In addition, we performed the characterization of FH, and interesting information was obtained with regard to the relationship between the chemical structure and fluorescence.
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28
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Koh CS, Navrot N, Didierjean C, Rouhier N, Hirasawa M, Knaff DB, Wingsle G, Samian R, Jacquot JP, Corbier C, Gelhaye E. An atypical catalytic mechanism involving three cysteines of thioredoxin. J Biol Chem 2008; 283:23062-72. [PMID: 18552403 DOI: 10.1074/jbc.m802093200] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Unlike other thioredoxins h characterized so far, a poplar thioredoxin of the h type, PtTrxh4, is reduced by glutathione and glutaredoxin (Grx) but not NADPH:thioredoxin reductase (NTR). PtTrxh4 contains three cysteines: one localized in an N-terminal extension (Cys(4)) and two (Cys(58) and Cys(61)) in the classical thioredoxin active site ((57)WCGPC(61)). The property of a mutant in which Cys(58) was replaced by serine demonstrates that it is responsible for the initial nucleophilic attack during the catalytic cycle. The observation that the C4S mutant is inactive in the presence of Grx but fully active when dithiothreitol is used as a reductant indicates that Cys(4) is required for the regeneration of PtTrxh4 by Grx. Biochemical and x-ray crystallographic studies indicate that two intramolecular disulfide bonds involving Cys(58) can be formed, linking it to either Cys(61) or Cys(4). We propose thus a four-step disulfide cascade mechanism involving the transient glutathionylation of Cys(4) to convert this atypical thioredoxin h back to its active reduced form.
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Affiliation(s)
- Cha San Koh
- Equipe Biocristallographie, UMR 7036 CNRS-Université Henri Poincaré, URAFPA, Equipe PB2P, Faculté des Sciences et Techniques, Nancy Université, BP 239, 54506 Vandoeuvre Cedex France
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Bou R, Codony R, Tres A, Decker EA, Guardiola F. Determination of hydroperoxides in foods and biological samples by the ferrous oxidation-xylenol orange method: a review of the factors that influence the method's performance. Anal Biochem 2008; 377:1-15. [PMID: 18358821 DOI: 10.1016/j.ab.2008.02.029] [Citation(s) in RCA: 128] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2007] [Revised: 02/26/2008] [Accepted: 02/26/2008] [Indexed: 10/22/2022]
Affiliation(s)
- Ricard Bou
- Department of Food Science, University of Massachusetts, Amherst, MA 01003, USA.
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Watson JB, Arnold MM, Ho YS, O'Dell TJ. Age-dependent modulation of hippocampal long-term potentiation by antioxidant enzymes. J Neurosci Res 2007; 84:1564-74. [PMID: 16941635 DOI: 10.1002/jnr.21040] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Oxidative stress has long been associated with normal aging and age-related neurodegenerative disorders such as Alzheimer's disease (AD) and Parkinson's disease (PD). However, it is now evident that reactive oxygen species (ROS) such as superoxide (O(2-*)) and hydrogen peroxide (H(2)O(2)) also play pivotal roles in normal cell signaling. The focus of the present study was to examine the effects of the antioxidant enzymes CuZnSOD (SOD1) and catalase, which produce and remove H(2)O(2), respectively, on long-term potentiation (LTP) forms of synaptic plasticity during aging. Consistent wth previous studies, LTP, when induced in vitro in CA1 of the hippocampus with a high-frequency stimulation protocol, is significantly reduced in slices from older mice (22-26 months) relative to younger mice (2-4 months). Neither knockout of the endogenous catalase gene (Cat KO) nor acute enzymatic treatment with SOD1 altered LTP in slices from adult mice. Conversely, enzymatic applications of SOD1 inhibited LTP in slices from older mice. A much different set of results emerges with exogenous applications of catalase to hippocampal slices. Catalase significantly inhibited LTP in slices from adult mice but reversed age-related LTP deficits in slices from older mice. Measurements of H(2)O(2) showed that exogenous treatments with catalase lowered H(2)O(2) in synapse-enriched synaptoneurosome (SN) fractions prepared from adult mice. Notably, SNs from both Cat KO and old mice were deficient in removing extracellular challenges of H(2)O(2). Overall, the results suggest that dynamic alterations in extracellular H(2)O(2) metabolism affect synaptic plasticity in the hippocampus during aging.
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Affiliation(s)
- J B Watson
- Department of Psychiatry and Biobehavioral Sciences, David Geffen School of Medicine at UCLA, Los Angeles, California 90095, USA.
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31
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Krishnan N, Kodrík D, Turanli F, Sehnal F. Stage-specific distribution of oxidative radicals and antioxidant enzymes in the midgut of Leptinotarsa decemlineata. JOURNAL OF INSECT PHYSIOLOGY 2007; 53:67-74. [PMID: 17126855 DOI: 10.1016/j.jinsphys.2006.10.001] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2006] [Revised: 09/29/2006] [Accepted: 10/03/2006] [Indexed: 05/12/2023]
Abstract
The titers of reactive oxygen species (ROS) represented by superoxide anion and general peroxides, and the activities of antioxidant enzymes superoxide dismutase (SOD) and catalase (CAT), are regulated in the midgut of the Colorado potato beetle (CPB) relative to the gut compartment, developmental stage, and food intake. ROS concentration is low in the potato leaves but it is very high in their digest in insect's anterior midgut. It is proposed that intensive ROS production in this gut region is linked to the processing of allelochemicals. SOD and CAT activities, low oxygen tension, and unidentified redox systems that maintain a slightly reducing milieu in the midgut lumen (pe+pH=6.95 declining to 5.36), obviously contribute to the decrease of ROS concentration along the gut length to a minimum in the wall of posterior midgut region. SOD and CAT activities are higher in the potato leaves than in the midgut tissues but the role of plant enzymes in ROS elimination within the gut lumen remains to be shown. A lower level of ROS and a higher antioxidant potential in the adult than in the larval midgut indicate stage specificity in the management of oxidative stress. The antioxidant defense is high in the diapausing adults that contain no detectable superoxide and about ten times less peroxides than the reproducing adults.
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Affiliation(s)
- Natraj Krishnan
- Institute of Entomology, Biology Centre of Academy of Sciences, and Faculty of Biological Sciences, University of South Bohemia; Branisovská 31, Ceské Budejovice 37005, Czech Republic.
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Krishnan N, Sehnal F. Compartmentalization of oxidative stress and antioxidant defense in the larval gut of Spodoptera littoralis. ARCHIVES OF INSECT BIOCHEMISTRY AND PHYSIOLOGY 2006; 63:1-10. [PMID: 16921519 DOI: 10.1002/arch.20135] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Allelochemicals play important roles in the plant defense against herbivorous insects. They act as feeding deterrents, interfere with digestion and nutrient absorption, and cause production of potentially dangerous oxidative radicals. This study demonstrates that the distributions of oxidative radicals and of the antioxidant enzymes that eliminate them are compartmentalized in the digestive tract of Spodoptera littoralis larvae. Feeding on diets supplemented with the tannic acid (TA), alpha-solanine, and demissidine, respectively, did not affect the rate of food passage through the digestive tract of larvae but 1.25, 2.5, and 5% TA evoked a strong oxidative response. The amount of the superoxide anion in the foregut tissue and content increased up to 70-fold and the titer of total peroxides in the foregut content about 3-fold. This oxidative stress was associated with enhanced carbonyl content in the foregut tissue proteins, indicative of certain tissue deterioration. Extensive foregut damage was probably prevented by elevated activity of the glutathione S-transferase peroxidase. A complex antioxidant response was elicited in the midgut. The activities of superoxide dismutase and catalase increased significantly in the midgut tissue and content, and the activity of ascorbate peroxidase rose in the midgut tissue. The enzymes apparently eliminated oxidative radicals passing to midgut from the foregut with the food bolus and thereby prevented carbonylation of the midgut proteins. We postulate that the generation of oxidative radicals in the foregut and the induction of antioxidant defense in the midgut are controlled processes and that their compartmentalization is an important functional feature of the digestive tract. The glycoalkaloid alpha-solanine and the aglycone demissidine applied at 0.05 and 0.1% concentrations had no effect on any of the examined parameters.
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Affiliation(s)
- Natraj Krishnan
- Institute of Entomology, Academy of Sciences, Ceské Budejovice, Czech Republic
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Zinellu A, Sotgia S, Usai MF, Deiana L, Carru C. Monitoring the oxidative modification of lipoprotein(a) by capillary zone electrophoresis. EUR J LIPID SCI TECH 2006. [DOI: 10.1002/ejlt.200500333] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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34
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Krishnan N, Kodrík D. Antioxidant enzymes in Spodoptera littoralis (Boisduval): are they enhanced to protect gut tissues during oxidative stress? JOURNAL OF INSECT PHYSIOLOGY 2006; 52:11-20. [PMID: 16242709 DOI: 10.1016/j.jinsphys.2005.08.009] [Citation(s) in RCA: 102] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2005] [Revised: 08/23/2005] [Accepted: 08/31/2005] [Indexed: 05/05/2023]
Abstract
The Egyptian armyworm Spodoptera littoralis is a polyphagous insect attacking a number of plant species including those belonging to the Solanaceae and Cruciferaceae families. Its digestive physiology must therefore adapt to the food plant to ensure maximum extraction of nutrients with minimum trade-off in terms of growth retardation by pro-oxidant allelochemicals. To investigate this, the caterpillars of S. littoralis were fed on a semi-artificial diet (Manduca Premix-Heliothis Premix) and for 24 h on potato plants (Solanum tuberosum), respectively, at the mature 6th instar, and the levels of oxidative radicals and antioxidant enzymes in their guts were compared. The gut pH, standard redox potential (Eh) and electron availability (pe) revealed that oxidizing conditions prevail which promote oxidation of pro-oxidant allelochemicals in foliage. Oxidative stress in the foregut and midgut tissue and the gut contents was assessed from the generation of superoxide radical, total peroxide content and protein carbonyl content. Antioxidant defense was measured by the activities of superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APOX) and glutathione S-transferase peroxidase (GSTpx). A significant (p < 0.001) increase in the superoxide radical production (in foregut tissue, foregut and midgut contents), concomitant with an increase in total peroxide (in foregut contents) and protein carbonyl levels (in foregut and midgut tissue) were noted in larvae fed on the plants in contrast to those fed the semi-artificial diet. Similarly, a significant up-regulation of antioxidant enzymes SOD (in midgut tissues), CAT (in foregut, midgut tissue and contents), APOX (in foregut contents, midgut tissue and contents) and GSTpx (in foregut tissues) was recorded on the plant diet in comparison to the semi-artificial diet. The pro-oxidant allelochemicals in the plant diet are thus eliminated by the insect at the expense of up-regulation of antioxidative enzymes in response to increased oxidative stress from oxidizable allelochemicals. The results are consistent with the hypothesis that increased concentrations of antioxidants form an important component of the defense of herbivorous insects against both exogenous and endogenous oxidative radicals.
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Affiliation(s)
- Natraj Krishnan
- Department of Physiology, Institute of Entomology, Czech Academy of Sciences, Branisovská 31, Ceské Budejovice 370 05, Czech Republic.
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35
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Optimization of enzymatic assay for the measurement of lipoxygenase activity in organic solvent media. J AM OIL CHEM SOC 2005. [DOI: 10.1007/s11746-005-1149-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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36
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Kalogerakis G, Baker AM, Christov S, Rowley KG, Dwyer K, Winterbourn C, Best JD, Jenkins AJ. Oxidative stress and high-density lipoprotein function in Type I diabetes and end-stage renal disease. Clin Sci (Lond) 2005; 108:497-506. [PMID: 15634192 DOI: 10.1042/cs20040312] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
In a cross-sectional study, oxidative stress in high vascular disease risk groups, ESRD (end-stage renal disease) and Type I diabetes, was assessed by measuring plasma protein carbonyls and comparing antioxidant capacity of HDL (high-density lipoprotein) as pertaining to PON1 (paraoxonase 1) activity and in vitro removal of LPO (lipid peroxides). ESRD subjects on haemodialysis (n=22), Type I diabetes subjects (n=20) without vascular complications and healthy subjects (n=23) were compared. Plasma protein carbonyls were higher in ESRD patients [0.16 (0.050) nmol/mg of protein; P=0.001; value is mean (SD)] relative to subjects with Type I diabetes [0.099 (0.014) nmol/mg of protein] and healthy subjects [0.093 (0.014) nmol/mg of protein]. Plasma PON1 activity, with and without correction for HDL-cholesterol, was lower in diabetes but did not differ in ESRD compared with healthy subjects. Plasma PON1 activity, without correction for HDL, did not differ between the three groups. In ESRD, plasma PON1 activity and plasma protein carbonyl concentrations were inversely related (r=−0.50, P<0.05). In an in vitro assay, LPO removal by HDL in ESRD subjects was greater than HDL from healthy subjects (P<0.01), whereas HDL from patients with Type I diabetes was less effective (P<0.01). Efficacy of LPO removal was unrelated to plasma PON1 activity, in vitro glycation or mild oxidation, but was impaired by marked oxidation and glycoxidation. Protein carbonyl levels are increased in ESRD but not in complication-free Type I diabetes. HDL antioxidant function is increased in ESRD, perhaps a compensatory response to increased oxidative stress, but is lower in Type I diabetes. HDL dysfunction is related to glycoxidation rather than glycation or PON1 activity.
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Affiliation(s)
- George Kalogerakis
- Department of Medicine, The University of Melbourne, St. Vincent's Hospital, Fitzroy, 3065 Melbourne, Australia
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Lapenna D, Ciofani G, Pierdomenico SD, Giamberardino MA, Cuccurullo F. Copper, zinc superoxide dismutase plus hydrogen peroxide: a catalytic system for human lipoprotein oxidation. FEBS Lett 2004; 579:245-50. [PMID: 15620721 DOI: 10.1016/j.febslet.2004.11.081] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2004] [Accepted: 11/05/2004] [Indexed: 10/26/2022]
Abstract
We report for the first time that bovine or human CuZnSOD plus H2O2 can catalyze human lipoprotein oxidation, inducing like free copper ions a typical oxidative kinetics with lag and propagation phases. Free copper released from CuZnSOD by H2O2, but not enzyme peroxidase activity and carbonate radical anion, is responsible for lipoprotein oxidation, which is indeed totally inhibited by copper chelators and BHT but unaffected by bicarbonate. Moreover, lipoprotein oxidation is significantly counteracted by the OH* scavengers formate and azide, which can enter the active site of CuZnSOD and decrease copper release through scavenging of copper-bound OH*; benzoate and ethanol, which cannot enter, are instead ineffective, indicating no oxidative involvement of free OH* escaped from the enzyme active site. The possibility of CuZnSOD/H2O2-catalyzed lipoprotein oxidation in vivo is discussed.
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Affiliation(s)
- Domenico Lapenna
- Dipartimento di Medicina e Scienze dell'Invecchiamento, and Centro di Scienze dell'Invecchiamento-Fondazione Università G. d'Annunzio, Facoltà di Medicina e Chirurgia, Università G. d'Annunzio, 66100 Chieti, Italy.
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38
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The evaluation of the oxidative state of native-LDL: three methods compared. ACTA ACUST UNITED AC 2004; 61:271-81. [DOI: 10.1016/j.jbbm.2004.04.022] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2004] [Revised: 04/26/2004] [Accepted: 04/27/2004] [Indexed: 11/18/2022]
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39
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Gelhaye E, Rouhier N, Jacquot JP. Evidence for a subgroup of thioredoxin h that requires GSH/Grx for its reduction. FEBS Lett 2004; 555:443-8. [PMID: 14675753 DOI: 10.1016/s0014-5793(03)01301-2] [Citation(s) in RCA: 88] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Poplar thioredoxin h4 (popTrxh4) and a related CXXS type (popCXXS3) are both members of a plant thioredoxin h subgroup. PopTrxh4 exhibits the usual catalytic site WCGPC, whereas popCXXS3 harbors the non-typical active site WCMPS. Recombinant popTrxh4 and popCXXS3 are not reduced either by Arabidopsis thaliana NADPH-dependent thioredoxin reductases (NTR) A and B or by Escherichia coli NTR. We report here evidence that a poplar glutaredoxin as well as three E. coli Grxs are able to reduce popTrxh4. PopTrxh4 is able to reduce several thioredoxin targets as peroxiredoxins or methionine sulfoxide reductases. On the other hand, popCXXS3 exhibits an activity in the presence of glutathione and hydroxyethyldisulfide. Except for examples of glutathiolation, these are the first two examples of a direct interconnection between the thioredoxin and glutathione/glutaredoxin systems.
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Affiliation(s)
- Eric Gelhaye
- Unité Mixte de Recherche IaM INRA-UHP Nancy I, Université Henri Poincaré, 54506 Cedex, Vandoeuvre, France.
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40
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Abudu N, Miller JJ, Levinson SS. Lipoprotein Oxidation Products and Arteriosclerosis: Theory and Methods with Applicability to the Clinical Chemistry Laboratory. Adv Clin Chem 2004; 38:1-35. [PMID: 15521187 DOI: 10.1016/s0065-2423(04)38001-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Ntei Abudu
- Department of Pathology and Laboratory Medicine, University of Louisville, Louisville, Kentucky 40292, USA
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41
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Pricci F, Leto G, Amadio L, Iacobini C, Cordone S, Catalano S, Zicari A, Sorcini M, Di Mario U, Pugliese G. Oxidative stress in diabetes-induced endothelial dysfunction involvement of nitric oxide and protein kinase C. Free Radic Biol Med 2003; 35:683-94. [PMID: 12957660 DOI: 10.1016/s0891-5849(03)00401-5] [Citation(s) in RCA: 69] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Reactive oxygen species (ROS) formation plays a major role in diabetes-induced endothelial dysfunction, though the molecular mechanism(s) involved and the contribution of nitric oxide (NO) are still unclear. This study using bovine retinal endothelial cells was aimed at assessing (i) the role of oxygen-dependent vs. NO-dependent oxidative stress in the endothelial cell permeability alterations induced by the diabetic milieu and (ii) whether protein kinase C (PKC) activation ultimately mediates these changes. Superoxide, lipid peroxide, and PKC activity were higher under high glucose (HG) vs. normal glucose throughout the 30 d period. Nitrite/nitrate and endothelial NO synthase levels increased at 1 d and decreased thereafter. Changes in monolayer permeability to 125I-BSA induced by 1 or 30 d incubation in HG or exposure to advanced glycosylation endproduct were reduced by treatment with antioxidants or PKC inhibitors, whereas NO blockade prevented only the effect of 1 d HG. HG-induced changes were mimicked by a PKC activator, a superoxide generating system, an NO and superoxide donor, or peroxynitrite (attenuated by PKC inhibition), but not a NO donor. The short-term effect of HG depends on a combined oxidative and nitrosative stress with peroxynitrite formation, whereas the long-term effect is related to ROS generation; in both cases, PKC ultimately mediates permeability changes.
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Affiliation(s)
- Flavia Pricci
- Laboratory of Metabolism and Pathological Biochemistry, Istituto Superiore di Sanità, Rome, Italy
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42
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Yin H, Porter NA. Specificity of the ferrous oxidation of xylenol orange assay: analysis of autoxidation products of cholesteryl arachidonate. Anal Biochem 2003; 313:319-26. [PMID: 12605870 DOI: 10.1016/s0003-2697(02)00621-8] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Autoxidation of polyunsaturated fatty acids and esters leads to a complex mixture containing hydroperoxides and cyclic peroxides. The oxidation mixture of cholesteryl arachidonate, which has been characterized by a variety of mass spectrometry techniques, was subject to analysis by conventional thiobarbituric acid-reactive substance (TBARS) and ferrous oxidation in xylenol orange (FOX) assays. Our results indicate that the FOX assay is not specific for hydroperoxides. Cyclic peroxides, such as monocyclic peroxides and serial-cyclic peroxides, give a positive FOX response even after triphenylphosphine reduction. We suggest that bicyclic endoperoxides are the major TBARS active compounds present in cholesteryl arachidonate oxidation mixtures. These compounds give a positive FOX assay before reaction with triphenylphosphine but negative TBARS and FOX assays after this reaction. Caution should be exercised when the FOX assay is used to analyze highly oxidized lipids, especially arachidonyl-containing lipids.
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Affiliation(s)
- Huiyong Yin
- Department of Chemistry and Center in Molecular Toxicology, Vanderbilt University, Nashville, TN 37235, USA
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43
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Fraisse L, Bonnet MC, de Farcy JP, Agut C, Dersigny D, Bayol A. A colorimetric 96-well microtiter plate assay for the determination of urate oxidase activity and its kinetic parameters. Anal Biochem 2002; 309:173-9. [PMID: 12413448 DOI: 10.1016/s0003-2697(02)00293-2] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Urate oxidase (E.C.1.7.3.3; uricase, urate oxygen oxidoreductase) is an enzyme of the purine breakdown pathway that catalyzes the oxidation of uric acid in the presence of oxygen to allantoin and hydrogen peroxide. A 96-well plate assay measurement of urate oxidase activity based on hydrogen peroxide quantitation was developed. The 96-well plate method included two steps: an incubation step for the urate oxidase reaction followed by a step in which the urate oxidase activity is stopped in the presence of 8-azaxanthine, a competitive inhibitor. Hydrogen peroxide is quantified during the second step by a horseradish peroxidase-dependent system. Under the defined conditions, uric acid, known as a radical scavenger, did not interfere with hydrogen peroxide quantification. The general advantages of such a colorimetric assay performed in microtiter plates, compared to other methods and in particular the classical UV method performed with cuvettes, are easy handling of large amounts of samples at the same time, the possibility of automation, and the need for less material. The method has been applied to the determination of the kinetic parameters of rasburicase, a recombinant therapeutic enzyme.
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Affiliation(s)
- Laurent Fraisse
- Biochemistry Unit, Sanofi-Synthelabo Recherche, Innopole, Voie No. 1, BP 137, 31676 Labège Cedex, France.
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Nieto N, Friedman SL, Cederbaum AI. Cytochrome P450 2E1-derived reactive oxygen species mediate paracrine stimulation of collagen I protein synthesis by hepatic stellate cells. J Biol Chem 2002; 277:9853-64. [PMID: 11782477 DOI: 10.1074/jbc.m110506200] [Citation(s) in RCA: 136] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
To evaluate possible fibrogenic effects of CYP2E1-dependent generation of reactive oxygen species, a model was developed using co-cultures of HepG2 cells, which do (E47 cells) or do not (C34 cells) express cytochrome P450 2E1 (CYP2E1) with stellate cells. There was an increase in intra- and extracellular H(2)O(2), lipid peroxidation, and collagen type I protein in stellate cells co-cultured with E47 cells compared with stellate cells alone or co-cultured with C34 cells. The increase in collagen was prevented by antioxidants and a CYP2E1 inhibitor. CYP3A4 did not mimic the stimulatory effects found with CYP2E1. Collagen mRNA levels remained unchanged, and pulse-chase analysis indicated similar half-lives of collagen I protein between both co-cultures. However, collagen protein synthesis was increased in E47 co-culture. Hepatocytes from pyrazole-treated rats (with high levels of CYP2E1) induced collagen protein in primary stellate cells, and antioxidants and CYP2E1 inhibitors blocked this effect. These results suggest that increased translation of collagen mRNA by CYP2E1-derived reactive oxygen species is responsible for the increase in collagen protein produced by the E47 co-culture. These co-culture models may be useful for understanding the impact of CYP2E1-derived ROS on stellate cell function and activation.
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Affiliation(s)
- Natalia Nieto
- Department of Pharmacology and Biological Chemistry, Mount Sinai School of Medicine, New York, New York 10029, USA
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