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Murphy B, Gabbaï FP. Binding, Sensing, And Transporting Anions with Pnictogen Bonds: The Case of Organoantimony Lewis Acids. J Am Chem Soc 2023; 145:19458-19477. [PMID: 37647531 PMCID: PMC10863067 DOI: 10.1021/jacs.3c06991] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2023] [Indexed: 09/01/2023]
Abstract
Motivated by the discovery of main group Lewis acids that could compete or possibly outperform the ubiquitous organoboranes, several groups, including ours, have engaged in the chemistry of Lewis acidic organoantimony compounds as new platforms for anion capture, sensing, and transport. Principal to this approach are the intrinsically elevated Lewis acidic properties of antimony, which greatly favor the addition of halide anions to this group 15 element. The introduction of organic substituents to the antimony center and its oxidation from the + III to the + V state provide for tunable Lewis acidity and a breadth of applications in supramolecular chemistry and catalysis. The performances of these antimony-based Lewis acids in the domain of anion sensing in aqueous media illustrate the favorable attributes of antimony as a central element. At the same time, recent advances in anion binding catalysis and anion transport across phospholipid membranes speak to the numerous opportunities that lie ahead in the chemistry of these unique main group compounds.
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Affiliation(s)
- Brendan
L. Murphy
- Department of Chemistry, Texas A&M University, College
Station, Texas 77843-3255, United States
| | - François P. Gabbaï
- Department of Chemistry, Texas A&M University, College
Station, Texas 77843-3255, United States
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2
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Luo Y, Da D, Weng Q, Yao S, Zhang H, Han X, Zhang Y. miR-296-5p promotes autophagy in mouse LS8 cells under excessive fluoride via AMPK/ULK1 pathways. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2022; 235:113362. [PMID: 35306215 DOI: 10.1016/j.ecoenv.2022.113362] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2021] [Revised: 02/16/2022] [Accepted: 02/25/2022] [Indexed: 06/14/2023]
Abstract
Numerous microRNAs participate in regulating the pathological process of autophagy. We have found miR-296-5p is one of the most significantly down-regulated microRNAs in a high concentration of sodium fluoride. However, it is not clear whether miR-296-5p augments autophagy in dental fluorosis. Our purpose is to explore the function of miR-296-5p in regulating autophagy of excessive fluoride development. Thus, the cell line of ameloblasts LS8 was exposed to a 1.5 mM dose of NaF and miR-296-5p-mimics, Real-time qPCR, CCK-8 assays, Fluorescence imaging and Western blot analysis were performed. Autophagy was observed. As our results indicated, miR-296-5p overexpression in mouse LS8 cells significantly accelerated autophagy. The autophagy inhibition effect of miR-296-5p underexpression was consistent with the effect of the AMPK inhibitor. And we found that the expression of LC3II was decreased via down-regulation of AMPK. The change of ULK1 by miR-296-5p may be accomplished through AMPK. Thus, miR-296-5p may improve the secretion of autophagic mediators by activating AMPK/ULK1 expression in fluorosis, suggesting that miR-296-5p, AMPK/ULK1 may be potential therapeutic targets under the higher fluoride stimulation.
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Affiliation(s)
- Yinyue Luo
- Department of Preventive Dentistry, Shanghai Stomatological Hospital, Fudan University, China; Shanghai Key Laboratory of Craniomaxillofacial Development and Diseases, Fudan University, China
| | - Dongxin Da
- Department of Preventive Dentistry, Shanghai Stomatological Hospital, Fudan University, China; Shanghai Key Laboratory of Craniomaxillofacial Development and Diseases, Fudan University, China
| | - Qingqing Weng
- Department of Preventive Dentistry, Shanghai Stomatological Hospital, Fudan University, China; Shanghai Key Laboratory of Craniomaxillofacial Development and Diseases, Fudan University, China
| | - Shuran Yao
- Department of Preventive Dentistry, Shanghai Stomatological Hospital, Fudan University, China; Shanghai Key Laboratory of Craniomaxillofacial Development and Diseases, Fudan University, China
| | - Hao Zhang
- Department of Preventive Dentistry, Shanghai Stomatological Hospital, Fudan University, China; Shanghai Key Laboratory of Craniomaxillofacial Development and Diseases, Fudan University, China
| | - Xinxin Han
- Shanghai Key Laboratory of Craniomaxillofacial Development and Diseases, Fudan University, China
| | - Ying Zhang
- Department of Preventive Dentistry, Shanghai Stomatological Hospital, Fudan University, China; Shanghai Key Laboratory of Craniomaxillofacial Development and Diseases, Fudan University, China.
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Silkin YA, Silkina EN, Silkin MY. The Effect of Azide, Fluoride, Orthovanadate and EDTA Sodium Salts on Ecto-ATPase Activity in Erythrocytes of a Scorpionfish (Scorpaena porcus L.) and Thornback Ray (Raja clavata L.). J EVOL BIOCHEM PHYS+ 2021. [DOI: 10.1134/s0022093021050033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Maheshwari N, Qasim N, Anjum R, Mahmood R. Fluoride enhances generation of reactive oxygen and nitrogen species, oxidizes hemoglobin, lowers antioxidant power and inhibits transmembrane electron transport in isolated human red blood cells. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2021; 208:111611. [PMID: 33396131 DOI: 10.1016/j.ecoenv.2020.111611] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2020] [Revised: 10/29/2020] [Accepted: 11/02/2020] [Indexed: 06/12/2023]
Abstract
Fluoride is a widespread environmental pollutant that at high levels exerts numerous deleterious effects on human health. The toxic effects of fluoride are a matter of serious concern since many countries have regions of endemic fluorosis. The main source of fluoride exposure for humans is intake of contaminated groundwater. Fluoride is absorbed from the gastrointestinal tract and enters the circulating blood, where the abundant red blood cells (RBC) are an early and major target of fluoride toxicity. Chronic fluoride exposure generates free radicals, reactive species which leads to redox imbalance, cytotoxicity and hematological damage. This study aimed to determine the effect of sodium fluoride (NaF) on human RBC under in vitro conditions. Isolated RBC were incubated with different concentrations of NaF (10-500 µM) for 8 h at 37 °C. Several biochemical parameters were determined in hemolysates or whole cells. Treatment of RBC with NaF enhanced the generation of reactive oxygen and nitrogen species. This increased the oxidation of hemoglobin to yield methemoglobin and oxoferrylhemoglobin, which are inactive in oxygen transport. NaF treatment increased the degradation of heme causing release of free iron from its porphyrin ring. Cellular antioxidant power was significantly decreased in NaF-treated RBC, lowering the metal reducing and free radical quenching ability of cells. The two pathways of glucose metabolism in RBC i.e. glycolysis and hexose monophosphate shunt, were inhibited. NaF also inhibited the plasma membrane redox system, and its associated ascorbate free radical reductase, to disrupt transmembrane electron transport. These results suggest that fluoride generates reactive species that cause extensive oxidative modifications in human RBC.
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Affiliation(s)
- Nikhil Maheshwari
- Department of Biochemistry, Faculty of Life Sciences, Aligarh Muslim University, Aligarh 202002, UP, India
| | - Neha Qasim
- Department of Biochemistry, Faculty of Life Sciences, Aligarh Muslim University, Aligarh 202002, UP, India
| | - Ruhi Anjum
- Department of Biochemistry, Faculty of Life Sciences, Aligarh Muslim University, Aligarh 202002, UP, India
| | - Riaz Mahmood
- Department of Biochemistry, Faculty of Life Sciences, Aligarh Muslim University, Aligarh 202002, UP, India.
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5
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Abstract
Our work on the complexation of fluoride anions using group 15 Lewis acids has led us to investigate the use of these main group compounds as anion transporters. In this paper, we report on the anion transport properties of tetraarylstibonium and tetraarylbismuthonium cations of the general formula [Ph3PnAr]+ with Pn = Sb or Bi and with Ar = phenyl, naphthyl, anthryl, or pyrenyl. Using EYPC-based large unilamellar vesicles, we show that these main group cations transport hydroxide, fluoride and chloride anions across phospholipid bilayers. A comparison of the properties of [Ph3SbAnt]+ and [Ph3BiAnt]+ (Ant = 9-anthryl) illustrates the favorable role played by the Lewis acidity of the central pnictogen element with respect to the anion transport. Finally, we show that [Ph3SbAnt]+ accelerates the fluoride-induced hemolysis of human red blood cells, an effect that we assign to the transporter-facilitated influx of toxic fluoride anions.
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Agalakova NA, Petrova TI, Gusev GP. Activation of Fas Receptors, Caspase-8 and Caspase-3 by Fluoride Ions in Rat Erythrocytes in vitro. J EVOL BIOCHEM PHYS+ 2019. [DOI: 10.1134/s0022093019020029] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Waugh DT. Fluoride Exposure Induces Inhibition of Sodium-and Potassium-Activated Adenosine Triphosphatase (Na +, K +-ATPase) Enzyme Activity: Molecular Mechanisms and Implications for Public Health. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2019; 16:E1427. [PMID: 31010095 PMCID: PMC6518254 DOI: 10.3390/ijerph16081427] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/27/2019] [Revised: 04/02/2019] [Accepted: 04/08/2019] [Indexed: 12/24/2022]
Abstract
In this study, several lines of evidence are provided to show that Na + , K + -ATPase activity exerts vital roles in normal brain development and function and that loss of enzyme activity is implicated in neurodevelopmental, neuropsychiatric and neurodegenerative disorders, as well as increased risk of cancer, metabolic, pulmonary and cardiovascular disease. Evidence is presented to show that fluoride (F) inhibits Na + , K + -ATPase activity by altering biological pathways through modifying the expression of genes and the activity of glycolytic enzymes, metalloenzymes, hormones, proteins, neuropeptides and cytokines, as well as biological interface interactions that rely on the bioavailability of chemical elements magnesium and manganese to modulate ATP and Na + , K + -ATPase enzyme activity. Taken together, the findings of this study provide unprecedented insights into the molecular mechanisms and biological pathways by which F inhibits Na + , K + -ATPase activity and contributes to the etiology and pathophysiology of diseases associated with impairment of this essential enzyme. Moreover, the findings of this study further suggest that there are windows of susceptibility over the life course where chronic F exposure in pregnancy and early infancy may impair Na + , K + -ATPase activity with both short- and long-term implications for disease and inequalities in health. These findings would warrant considerable attention and potential intervention, not to mention additional research on the potential effects of F intake in contributing to chronic disease.
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Affiliation(s)
- Declan Timothy Waugh
- EnviroManagement Services, 11 Riverview, Doherty's Rd, P72 YF10 Bandon, Co. Cork, Ireland.
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Niu Q, He P, Xu S, Ma R, Ding Y, Mu L, Li S. Fluoride-induced iron overload contributes to hepatic oxidative damage in mouse and the protective role of Grape seed proanthocyanidin extract. J Toxicol Sci 2018; 43:311-319. [PMID: 29743442 DOI: 10.2131/jts.43.311] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Emerging evidence has demonstrated that iron overload plays an important role in oxidative stress in the liver. This study aimed to explore whether fluoride-induced hepatic oxidative stress is associated with iron overload and whether grape seed proanthocyanidin extract (GSPE) alleviates oxidative stress by reducing iron overload. Forty Kunming male mice were randomly divided into 4 groups and treated for 5 weeks with distilled water (control), sodium fluoride (NaF) (100 mg/L), GSPE (400 mg/kg bw), or NaF (100 mg/L) + GSPE (400 mg/kg bw). Mice exposed to NaF showed typical poisoning changes of morphology, increased aspartate aminotransferase and alanine aminotransferase activities in the liver. NaF treatment also increased MDA accumulation, decreased GSH-Px, SOD and T-AOC levels in liver, indicative of oxidative stress. Intriguingly, all these detrimental effects were alleviated by GSPE. Further study revealed that NaF induced disorders of iron metabolism, as manifested by elevated iron level with increased hepcidin but decreased ferroportin expression, which contributed to hepatic oxidative stress. Importantly, the iron dysregulation induced by NaF could be normalized by GSPE. Collectively, these data provide a novel insight into mechanisms underlying fluorosis and highlight the potential of GSPE as a naturally occurring prophylactic treatment for fluoride-induced hepatotoxicity associated with iron overload.
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Affiliation(s)
- Qiang Niu
- Department of Public Health, Medical College, Shihezi University, China
| | - Ping He
- Occupational disease prevention and control of hospital of the Xinjiang Uygur Autonomous Region, China
| | - Shangzhi Xu
- Department of Public Health, Medical College, Shihezi University, China
| | - Ruling Ma
- Department of Public Health, Medical College, Shihezi University, China
| | - Yusong Ding
- Department of Public Health, Medical College, Shihezi University, China
| | - Lati Mu
- Department of Public Health, Medical College, Shihezi University, China
| | - Shugang Li
- Department of Public Health, Medical College, Shihezi University, China
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Wang J, Zhao Y, Cheng X, Li Y, Xu H, Manthari RK, Wang J. Effects of different Ca 2+ level on fluoride-induced apoptosis pathway of endoplasmic reticulum in the rabbit osteoblast in vitro. Food Chem Toxicol 2018; 116:189-195. [PMID: 29642045 DOI: 10.1016/j.fct.2018.04.013] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2018] [Revised: 04/04/2018] [Accepted: 04/05/2018] [Indexed: 02/08/2023]
Abstract
In reviewing the literature, the cellular mechanism of fluoride F-induced osteoblast OB cells apoptosis is diverse and perplexing, but detailed regulatory pathway, targets and role of extracellular Ca2+ remains still unclear. Hence, in the present study, we investigated the effects of F (9 mg/L F ion) and different Ca2+ (0.5, 1, 2, 4, 8 mmol/L) levels treatment on the proliferation rate of osteoblast cells, intracellular free Ca2+ ([Ca2+]i) and endoplasmic reticulum (ER) stress apoptosis pathway related gene levels of rabbit OB cells. Our results demonstrated that F exposure had a pronounced negative effect on osteoblast survival, further different Ca2+ levels treatment suggested that low concentration of Ca2+ (0.5-1 mmol/L) relieved the damaged effect, on the contrary, high concentration of Ca2+ (2-8 mmol/L) enhanced the effect. In addition, F significantly increased [Ca2+]i levels and the expression of ER stress-induced cell apoptosis pathway related genes. Treatment with 0.5-1 mmol/L Ca2+ markedly reversed the F-induced harmful effects, but high dose Ca2+ (2-8 mmol/L) enhanced these effects. In summary, 0.5-1 mmol/L Ca2+ can alleviate F-induced OB cells injure through ER stress apoptosis pathway, which provided a dose basis for the future study on the treatment of skeletal fluorosis with Ca2+.
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Affiliation(s)
- Jinming Wang
- Shanxi Key Laboratory of Environmental Veterinary Medicine, Shanxi Agricultural University, Jinzhong, Shanxi, China
| | - Yangfei Zhao
- Shanxi Key Laboratory of Environmental Veterinary Medicine, Shanxi Agricultural University, Jinzhong, Shanxi, China
| | - Xiaofang Cheng
- College of Arts and Sciences, Shanxi Agricultural University, Jinzhong, Shanxi, China
| | - Yanyan Li
- Shanxi Key Laboratory of Environmental Veterinary Medicine, Shanxi Agricultural University, Jinzhong, Shanxi, China
| | - Huimiao Xu
- Shanxi Key Laboratory of Environmental Veterinary Medicine, Shanxi Agricultural University, Jinzhong, Shanxi, China
| | - Ram Kumar Manthari
- Shanxi Key Laboratory of Environmental Veterinary Medicine, Shanxi Agricultural University, Jinzhong, Shanxi, China
| | - Jundong Wang
- Shanxi Key Laboratory of Environmental Veterinary Medicine, Shanxi Agricultural University, Jinzhong, Shanxi, China.
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Erythrocytes as a biological model for screening of xenobiotics toxicity. Chem Biol Interact 2017; 279:73-83. [PMID: 29128605 DOI: 10.1016/j.cbi.2017.11.007] [Citation(s) in RCA: 129] [Impact Index Per Article: 18.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2017] [Revised: 10/24/2017] [Accepted: 11/07/2017] [Indexed: 01/15/2023]
Abstract
Erythrocytes are the main cells in circulation. They are devoid of internal membrane structures and easy to be isolated and handled providing a good model for different assays. Red blood cells (RBCs) plasma membrane is a multi-component structure that keeps the cell morphology, elasticity, flexibility and deformability. Alteration of membrane structure upon exposure to xenobiotics could induce various cellular abnormalities and releasing of intracellular components. Therefore the morphological changes and extracellular release of haemoglobin [hemolysis] and increased content of extracellular adenosine triphosphate (ATP) [as signs of membrane stability] could be used to evaluate the cytotoxic effects of various molecules. The nucleated RBCs from birds, fish and amphibians can be used to evaluate genotoxicity of different xenobiotics using comet, DNA fragmentation and micronucleus assays. The RBCs could undergo programmed cell death (eryptosis) in response to injury providing a useful model to analyze some mechanisms of toxicity that could be implicated in apoptosis of nucleated cells. Erythrocytes are vulnerable to peroxidation making it a good biological membrane model for analyzing the oxidative stress and lipid peroxidation of various xenobiotics. The RBCs contain a large number of enzymatic and non-enzymatic antioxidants. The changes of the RBCs antioxidant capacity could reflect the capability of xenobiotics to generate reactive oxygen species (ROS) resulting in oxidative damage of tissue. These criteria make RBCs a valuable in vitro model to evaluate the cytotoxicity of different natural or synthetic and organic or inorganic molecules by cellular damage measures.
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Singh R, Khatri P, Srivastava N, Jain S, Brahmachari V, Mukhopadhyay A, Mazumder S. Fluoride exposure abates pro-inflammatory response and induces in vivo apoptosis rendering zebrafish (Danio rerio) susceptible to bacterial infections. FISH & SHELLFISH IMMUNOLOGY 2017; 63:314-321. [PMID: 28223109 DOI: 10.1016/j.fsi.2017.02.022] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2016] [Revised: 01/21/2017] [Accepted: 02/17/2017] [Indexed: 06/06/2023]
Abstract
The present study describes the immunotoxic effect of chronic fluoride exposure on adult zebrafish (Danio rerio). Zebrafish were exposed to fluoride (71.12 mg/L; 1/10 LC50) for 30 d and the expression of selected genes studied. We observed significant elevation in the detoxification pathway gene cyp1a suggesting chronic exposure to non-lethal concentration of fluoride is indeed toxic to fish. Fluoride mediated pro-oxidative stress is implicated with the downregulation in superoxide dismutase 1 and 2 (sod1/2) genes. Fluoride affected DNA repair machinery by abrogating the expression of the DNA repair gene rad51 and growth arrest and DNA damage inducible beta a gene gadd45ba. The upregulated expression of casp3a coupled with altered Bcl-2 associated X protein/B-cell lymphoma 2 ratio (baxa/bcl2a) clearly suggested chronic fluoride exposure induced the apoptotic cascade in zebrafish. Fluoride-exposed zebrafish when challenged with non-lethal dose of fish pathogen A. hydrophila revealed gross histopathology in spleen, bacterial persistence and significant mortality. We report that fluoride interferes with system-level output of pro-inflammatory cytokines tumour necrosis factor-α, interleukin-1β and interferon-γ, as a consequence, bacteria replicate efficiently causing significant fish mortality. We conclude, chronic fluoride exposure impairs the redox balance, affects DNA repair machinery with pro-apoptotic implications and suppresses pro-inflammatory cytokines expression abrogating host immunity to bacterial infections.
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Affiliation(s)
- Rashmi Singh
- Immunobiology Laboratory, Department of Zoology, University of Delhi, Delhi 110 007, India
| | - Preeti Khatri
- Immunobiology Laboratory, Department of Zoology, University of Delhi, Delhi 110 007, India
| | - Nidhi Srivastava
- Immunobiology Laboratory, Department of Zoology, University of Delhi, Delhi 110 007, India
| | - Shruti Jain
- Dr. B. R. Ambedkar Center for Biomedical Research, University of Delhi, Delhi 110007, India
| | - Vani Brahmachari
- Dr. B. R. Ambedkar Center for Biomedical Research, University of Delhi, Delhi 110007, India
| | - Asish Mukhopadhyay
- National Institute of Cholera and Enteric Diseases, Kolkata, West Bengal 700010, India
| | - Shibnath Mazumder
- Immunobiology Laboratory, Department of Zoology, University of Delhi, Delhi 110 007, India.
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Singh R, Banerjee C, Ray A, Rajamani P, Mazumder S. Fluoride-induced headkidney macrophage cell apoptosis involves activation of the CaMKII g-ERK 1/2-caspase-8 axis: the role of superoxide in initiating the apoptotic cascade. Toxicol Res (Camb) 2016; 5:1477-1489. [PMID: 30090451 DOI: 10.1039/c6tx00206d] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2016] [Accepted: 07/22/2016] [Indexed: 11/21/2022] Open
Abstract
Fluoride is known to induce apoptosis though the mechanisms remain obscure. The aim of the present study was to understand the underlying molecular mechanisms of fluoride-induced apoptosis using fish headkidney macrophages (HKMs). Exposure to fluoride triggered HKM cell apoptosis as evidenced by Hoechst 333432 and AnnexinV-propidium iodide staining, the presence of an internucleosomal DNA ladder and the comet assay. Our results suggest the influx of extra-cellular Ca2+ to be an initial event in fluoride-induced HKM cell apoptosis. We observed persistently elevated levels of superoxide anions and our inhibitor studies with EGTA suggested the primal role of the Ca2+ flux in triggering superoxide production in fluoride-exposed HKM cells. Fluoride exposure led to elevated levels of Ca2+/CaM dependent protein kinase II gamma (CaMKIIg) and pre-treatment with the inhibitor KN-93 but not its inactive structural analogue KN-92 reduced the number of apoptotic cells establishing the pro-apoptotic role of CaMKIIg in fluoride-induced HKM cell apoptosis. We report that the sustained superoxide generation is primarily responsible for the increased CaMKIIg levels observed in fluoride-exposed HKM cells. Our inhibitor studies further implicated CaMKIIg in the activation of extracellular signal-regulated kinases 1 and 2 (ERK 1/2) culminating in caspase-8/caspase-3 mediated apoptosis of HKM cells. We conclude that fluoride-induced apoptosis is largely dependent on Ca2+ induced superoxide generation leading to elevation in CaMKIIg which in turn induces the phosphorylation of ERK 1/2 and downstream activation of extrinsic caspase cascade in HKM cells.
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Affiliation(s)
- Rashmi Singh
- Immunobiology Laboratory , Department of Zoology , University of Delhi , Delhi 110 007 , India . ; ; Tel: +91-11-27667985
| | - Chaitali Banerjee
- Immunobiology Laboratory , Department of Zoology , University of Delhi , Delhi 110 007 , India . ; ; Tel: +91-11-27667985
| | - Atish Ray
- Immunobiology Laboratory , Department of Zoology , University of Delhi , Delhi 110 007 , India . ; ; Tel: +91-11-27667985
| | - Paulraj Rajamani
- School of Environmental Sciences , Jawaharlal Nehru University , Delhi , India
| | - Shibnath Mazumder
- Immunobiology Laboratory , Department of Zoology , University of Delhi , Delhi 110 007 , India . ; ; Tel: +91-11-27667985
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Zouari M, Ben Ahmed C, Fourati R, Delmail D, Ben Rouina B, Labrousse P, Ben Abdallah F. Soil fluoride spiking effects on olive trees (Olea europaea L. cv. Chemlali). ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2014; 108:78-83. [PMID: 25042248 DOI: 10.1016/j.ecoenv.2014.06.022] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2013] [Revised: 05/23/2014] [Accepted: 06/19/2014] [Indexed: 06/03/2023]
Abstract
A pot experiment under open air conditions was carried out to investigate the uptake, accumulation and toxicity effects of fluoride in olive trees (Olea europaea L.) grown in a soil spiked with inorganic sodium fluoride (NaF). Six different levels (0, 20, 40, 60, 80 and 100mM NaF) of soil spiking were applied through NaF to irrigation water. At the end of the experiment, total fluoride content in soil was 20 and 1770mgFkg(-1) soil in control and 100mM NaF treatments, respectively. The comparative distribution of fluoride partitioning among the different olive tree parts showed that the roots accumulated the most fluoride and olive fruits were minimally affected by soil NaF spiking as they had the lowest fluoride content. In fact, total fluoride concentration varied between 12 and 1070µgFg(-1) in roots, between 9 and 570µgFg(-1) in shoots, between 12 and 290µgFg(-1) in leaves, and between 10 and 29µgFg(-1) in fruits, respectively for control and 100mM NaF treatments. Indeed, the fluoride accumulation pattern showed the following distribution: roots>shoots>leaves>fruits. On the other hand, fluoride toxicity symptoms such as leaf necrosis and leaf drop appeared only in highly spiked soils (60, 80 and 100mM NaF).
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Affiliation(s)
- M Zouari
- Laboratory of Plant Biodiversity and Dynamic of Ecosystems in Arid Area, Faculty of Sciences of Sfax, B.P. 1171, Sfax 3000, Tunisia; Laboratory of Improvement of Olive Productivity and Fruit Trees, Olive Tree Institute of Sfax, B.P. 1087, Sfax 3018, Tunisia; University of Limoges, Faculty of Pharmacy, Laboratory of Botany and Cryptogamy, GRESE EA 4330, 2 rue du Docteur Marcland, F-87025 Limoges, France.
| | - C Ben Ahmed
- Laboratory of Plant Biodiversity and Dynamic of Ecosystems in Arid Area, Faculty of Sciences of Sfax, B.P. 1171, Sfax 3000, Tunisia; Laboratory of Improvement of Olive Productivity and Fruit Trees, Olive Tree Institute of Sfax, B.P. 1087, Sfax 3018, Tunisia
| | - R Fourati
- Laboratory of Plant Biodiversity and Dynamic of Ecosystems in Arid Area, Faculty of Sciences of Sfax, B.P. 1171, Sfax 3000, Tunisia
| | - D Delmail
- Institute of Chemical Sciences of Rennes, CNRS UMR 6226, University of Rennes, 2, Avenue of Professor Léon Bernard F-35043 RENNES Cedex, France
| | - B Ben Rouina
- Laboratory of Improvement of Olive Productivity and Fruit Trees, Olive Tree Institute of Sfax, B.P. 1087, Sfax 3018, Tunisia
| | - P Labrousse
- University of Limoges, Faculty of Pharmacy, Laboratory of Botany and Cryptogamy, GRESE EA 4330, 2 rue du Docteur Marcland, F-87025 Limoges, France.
| | - F Ben Abdallah
- Laboratory of Plant Biodiversity and Dynamic of Ecosystems in Arid Area, Faculty of Sciences of Sfax, B.P. 1171, Sfax 3000, Tunisia
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Evaluation of antioxidant activities of ampelopsin and its protective effect in lipopolysaccharide-induced oxidative stress piglets. PLoS One 2014; 9:e108314. [PMID: 25268121 PMCID: PMC4182461 DOI: 10.1371/journal.pone.0108314] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2014] [Accepted: 08/28/2014] [Indexed: 01/01/2023] Open
Abstract
The aim of this study was to investigate the antioxidant potential of ampelopsin (APS) by using various methods in vitro, as well as to determine effects of APS on LPS-induced oxidative stress in piglets. The results showed that APS exhibited excellent free radical scavenging by DPPH, ABTS, O2•−, H2O2 and ferric reducing antioxidant power. Ampelopsin also protected pig erythrocytes against AAPH-induced apoptosis and hemolysis, decreased total superoxide dismutase activity, and increased lipid peroxidation. Furthermore the results demonstrated that APS enhanced the total antioxidant capacity and decreased the malondialdehyde and protein carbonyl contents in LPS-treated piglets. The results of the present investigation suggest that APS possesses a strong antioxidant activity and alleviates LPS-induced oxidative stress, possibly due to its ability to prevent reactive oxygen species.
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15
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Transient activation of protein kinase C contributes to fluoride-induced apoptosis of rat erythrocytes. Toxicol In Vitro 2013. [DOI: 10.1016/j.tiv.2013.10.010] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Perumal E, Paul V, Govindarajan V, Panneerselvam L. A brief review on experimental fluorosis. Toxicol Lett 2013; 223:236-51. [DOI: 10.1016/j.toxlet.2013.09.005] [Citation(s) in RCA: 114] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2013] [Revised: 09/06/2013] [Accepted: 09/08/2013] [Indexed: 01/17/2023]
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Deng Y, Cui H, Peng X, Fang J, Zuo Z, Deng J, Luo Q. Effects of high dietary fluorine on erythrocytes and erythrocyte immune adherence function in broiler chickens. Biol Trace Elem Res 2013; 155:247-52. [PMID: 23955484 DOI: 10.1007/s12011-013-9793-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/13/2013] [Accepted: 08/07/2013] [Indexed: 10/26/2022]
Abstract
Fluoride can exert toxic effects on soft tissues, giving rise to a broad array of symptoms and pathological changes. The aim of this study was to investigate on erythrocytes and erythrocyte immune adherence function in broiler chickens fed with high fluorine (F) diets by measuring the total erythrocyte count (TEC), the contents of hemoglobin (Hb), packed cell volumn (PCV), erythrocyte osmotic fragility (EOF), erythrocyte C3b receptor rosette rate (E-C3bRR), and erythrocyte immune complex rosette rate (E-ICRR). A total of 280 1-day-old healthy avian broiler chickens were randomly allotted into four equal groups of 70 birds each and fed with a corn-soybean basal diet containing 22.6 mg F/kg (control group) or same basal diets supplemented with 400, 800, and 1,200 mg F/kg (high F groups I, II, and III) in the form of sodium fluoride for 42 days. Blood samples were collected for the abovementioned parameters analysis at 14, 28, and 42 days of age during the experiment. The experimental results indicated that TEC, Hb, and PCV were significantly lower (p < 0.05 or p < 0.01), and EOF was higher (p < 0.05 or p < 0.01) in the high F groups II and III than that in the control group from 14 to 42 days of age. The E-C3bRR was significantly decreased (p < 0.01) in the three high F groups, whereas the E-ICRR was markedly increased (p < 0.01) in the high F groups II and III from 14 to 42 days of age. It was concluded that dietary F in the range of 800 to 1, 200 mg/kg could significantly cause anemia and impair the integrity of erythrocyte membrane, the transport capacity of oxygen and carbon dioxide, and erythrocyte immune adherence function in broiler chickens.
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Affiliation(s)
- Yubing Deng
- Key Laboratory of Animal Diseases and Environmental Hazards of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University, Ya'an, 625014, China
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Gutiérrez-Salinas J, García-Ortíz L, Morales González JA, Hernández-Rodríguez S, Ramírez-García S, Núñez-Ramos NR, Madrigal-Santillán E. In vitro effect of sodium fluoride on malondialdehyde concentration and on superoxide dismutase, catalase, and glutathione peroxidase in human erythrocytes. ScientificWorldJournal 2013; 2013:864718. [PMID: 24223512 PMCID: PMC3800586 DOI: 10.1155/2013/864718] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2013] [Accepted: 08/21/2013] [Indexed: 02/07/2023] Open
Abstract
The aim of this paper was to describe the in vitro effect of sodium fluoride (NaF) on the specific activity of the major erythrocyte antioxidant enzymes, as well as on the membrane malondialdehyde concentration, as indicators of oxidative stress. For this purpose, human erythrocytes were incubated with NaF (0, 7, 28, 56, and 100 μg/mL) or NaF (100 μg/mL) + vitamin E (1, 2.5, 5 and 10 μg/mL). The malondialdehyde (MDA) concentration on the surface of the erythrocytes was determined, as were the enzymatic activities of superoxide dismutase (SOD), catalase (CAT), and glutathione peroxidase (GlPx). Our results demonstrated that erythrocytes incubated with increasing NaF concentrations had an increased MDA concentration, along with decreased activity of antioxidant enzymes. The presence of vitamin E partially reversed the toxic effects of NaF on erythrocytes. These findings suggest that NaF induces oxidative stress in erythrocytes in vitro, and this stress is partially reversed by the presence of vitamin E.
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Affiliation(s)
- José Gutiérrez-Salinas
- Laboratory of Biochemistry and Experimental Medicine, Biomedical Research Division, National Medical Center “20 de Noviembre,” ISSSTE, Sn. Lorenzo No. 502, 2° piso, Col. Del Valle, 03100 México, DF, Mexico
| | - Liliana García-Ortíz
- División of Genomic Medicine, National Medical Center “20 de Noviembre,” ISSSTE, Sn. Lorenzo No. 502, 2° piso, Col. Del Valle, 03100 México, DF, Mexico
| | - José A. Morales González
- Laboratorio Medicina de Conservación, Escuela Superior de Medicina, Instituto Politécnico Nacional, Plan de San Luis y Díaz Mirón, Col. Casco de Santo Tomás, Del. Miguel Hidalgo, 11340 México, DF, Mexico
| | - Sergio Hernández-Rodríguez
- Laboratory of Biochemistry and Experimental Medicine, Biomedical Research Division, National Medical Center “20 de Noviembre,” ISSSTE, Sn. Lorenzo No. 502, 2° piso, Col. Del Valle, 03100 México, DF, Mexico
| | | | - Norma R. Núñez-Ramos
- Uromédica OSF, Calle Uxmal 422, Colonia Vértiz Narvarte, 03020 México, DF, Mexico
| | - Eduardo Madrigal-Santillán
- Laboratorio Medicina de Conservación, Escuela Superior de Medicina, Instituto Politécnico Nacional, Plan de San Luis y Díaz Mirón, Col. Casco de Santo Tomás, Del. Miguel Hidalgo, 11340 México, DF, Mexico
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Agalakova NI, Gusev GP. Excessive fluoride consumption leads to accelerated death of erythrocytes and anemia in rats. Biol Trace Elem Res 2013; 153:340-9. [PMID: 23673526 DOI: 10.1007/s12011-013-9691-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/14/2013] [Accepted: 04/30/2013] [Indexed: 10/26/2022]
Abstract
The present study was performed to evaluate an overall effect of long-term consumption of excessive fluoride (F) amounts by rats on their erythrocytes. The animals were administered regular drinking water (0.4 ppm F) or the same water supplemented with 2, 10, and 20 ppm F (as NaF) for 12 months. Chronic exposure of the rats to increasing F doses induced a progressive rise of the plasma F concentration accompanied by a dose-dependent fall of hematocrit and decrease in the mean erythrocyte volume. Consumption of 10 and 20 ppm F resulted in appearance of morphologically abnormal cells (stomatocytes and echinocytes) in the peripheral blood. Rise of the water F concentration to 20 ppm F led to significant increase in the number of phosphatidylserine-exposing erythrocytes, although suppression of cell viability was revealed in all three groups of F-poisoned rats. A compensatory enhanced release of reticulocytes was not sufficient to compensate for erythrocyte loss. Dose-dependent accumulation of free cytosolic Ca(2+) appears to be a major pathophysiological process underlying the development of F-induced death processes in rat erythrocytes. In addition, 10 and 20 ppm F induced ATP depletion and generation of peroxides in erythrocytes, whereas superoxide and glutathione levels were not altered. Thus, long-term intoxication of the rats with F triggers premature death of their erythrocytes due to intrinsic death-associated biochemical defects and development of anemia.
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Affiliation(s)
- Natalia Ivanovna Agalakova
- Sechenov Institute of Evolutionary Physiology and Biochemistry, Russian Academy of Sciences, 44 M. Thorez pr., Saint Petersburg 194223, Russia.
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Jilani K, Lupescu A, Zbidah M, Shaik N, Lang F. Withaferin A-stimulated Ca2+ entry, ceramide formation and suicidal death of erythrocytes. Toxicol In Vitro 2012; 27:52-8. [PMID: 22989414 DOI: 10.1016/j.tiv.2012.09.004] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2012] [Revised: 08/29/2012] [Accepted: 09/07/2012] [Indexed: 01/25/2023]
Abstract
Withaferin A, a triterpenoid component from Withania somnifera, counteracts malignancy, an effect attributed to stimulation of apoptosis. Withaferin A is partially effective through induction of oxidative stress, altered gene expression and mitochondrial depolarization. Erythrocytes lack mitochondria and nuclei but may enter apoptosis-like eryptosis, a suicidal cell death characterized by cell shrinkage and cell membrane scrambling with phosphatidylserine exposure at the cell surface. Triggers of eryptosis include increase of cytosolic Ca(2+)-activity [Ca(2+)](i) following activation of oxidant-sensitive Ca(2+)-permeable cation channels, ceramide formation and/or ATP-depletion. The present study explored, whether withaferin A triggers eryptosis. To this end, [Ca(2+)](i) was estimated from Fluo3-fluorescence, cell volume from forward scatter, phosphatidylserine exposure from annexin-V-binding, hemolysis from hemoglobin release, oxidative stress from DCFDA-fluorescence and ceramide abundance utilizing antibodies. A 48 h exposure to withaferin A significantly decreased forward scatter (at ≥ 10 μM withaferin concentration) and increased [Ca(2+)](i) (≥ 5 μM), ROS-formation (≥ 10 μM) ceramide-formation ( ≥ 10 μM) as well as annexin-V-binding ( ≥ 5 μM). Withaferin A treatment was followed by slight but significant increase of hemolysis. Extracellular Ca(2+) removal, amiloride, and the antioxidant N-acetyl-l-cysteine significantly blunted withaferin A-triggered annexin-V-binding. The present observations reveal that withaferin A triggers suicidal erythrocyte death despite the absence of gene expression and key elements of apoptosis such as mitochondria.
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Affiliation(s)
- Kashif Jilani
- Department of Physiology, University of Tuebingen, Gmelinstraße 5, 72076 Tuebingen, Germany
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Agalakova NI, Gusev GP. Fluoride induces oxidative stress and ATP depletion in the rat erythrocytes in vitro. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2012; 34:334-337. [PMID: 22706453 DOI: 10.1016/j.etap.2012.05.006] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2011] [Revised: 05/14/2012] [Accepted: 05/19/2012] [Indexed: 06/01/2023]
Abstract
The present study was designed to examine an ability of inorganic fluoride (F) to induce oxidative stress and energy depletion in the rat erythrocytes in vitro. Accumulation of ROS and alterations in glutathione (GSH) and ATP contents were estimated in the cells incubated with 0.1-10mM NaF for 1, 5 and 24h. Exposure of the rat erythrocytes to NaF was accompanied by progressive accumulation of peroxides, while superoxide (O(2)(-)) production was insignificant. Intracellular GSH content was reduced following 5-h incubation, but considerably elevated after 24h, although GSH/GSSG ratio decreased in both cases. ATP concentration in the NaF-treated cell exhibited a dose- and time-dependent decline, diminishing to extremely low levels within 24h. Thus, exposure of the rat erythrocytes to NaF leads to impairment of the cellular antioxidant system and severe energy depletion, the latter probably being the primary toxic effect.
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Affiliation(s)
- Natalia I Agalakova
- Sechenov Institute of Evolutionary Physiology and Biochemistry, Russian Academy of Sciences, Sankt-Petersburg, Russia.
| | - Gennadii P Gusev
- Sechenov Institute of Evolutionary Physiology and Biochemistry, Russian Academy of Sciences, Sankt-Petersburg, Russia
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Agalakova NI, Gusev GP. Molecular Mechanisms of Cytotoxicity and Apoptosis Induced by Inorganic Fluoride. ACTA ACUST UNITED AC 2012. [DOI: 10.5402/2012/403835] [Citation(s) in RCA: 87] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Fluoride (F) is ubiquitous natural substance and widespread industrial pollutant. Although low fluoride concentrations are beneficial for normal tooth and bone development, acute or chronic exposure to high fluoride doses results in adverse health effects. The molecular mechanisms underlying fluoride toxicity are different by nature. Fluoride is able to stimulate G-proteins with subsequent activation of downstream signal transduction pathways such as PKA-, PKC-, PI3-kinase-, Ca2+-, and MAPK-dependent systems. G-protein-independent routes include tyrosine phosphorylation and protein phosphatase inhibition. Along with other toxic effects, fluoride was shown to induce oxidative stress leading to excessive generation of ROS, lipid peroxidation, decrease in the GSH/GSSH ratio, and alterations in activities of antioxidant enzymes, as well as to inhibit glycolysis thus causing the depletion of cellular ATP and disturbances in cellular metabolism. Fluoride triggers the disruption of mitochondria outer membrane and release of cytochrome c into cytosol, what activates caspases-9 and -3 (intrinsic) apoptotic pathway. Extrinsic (death receptor) Fas/FasL-caspase-8 and -3 pathway was also described to be implicated in fluoride-induced apoptosis. Fluoride decreases the ratio of antiapoptotic/proapoptotic Bcl-2 family proteins and upregulates the expression of p53 protein. Finally, fluoride changes the expression profile of apoptosis-related genes and causes endoplasmic reticulum stress leading to inhibition of protein synthesis.
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Affiliation(s)
- Natalia Ivanovna Agalakova
- Sechenov Institute of Evolutionary Physiology and Biochemistry, Russian Academy of Sciences, 44 M. Thorez Avenue, Sankt-Petersburg 194223, Russia
| | - Gennadii Petrovich Gusev
- Sechenov Institute of Evolutionary Physiology and Biochemistry, Russian Academy of Sciences, 44 M. Thorez Avenue, Sankt-Petersburg 194223, Russia
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