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Tellurium: A Rare Element with Influence on Prokaryotic and Eukaryotic Biological Systems. Int J Mol Sci 2021; 22:ijms22115924. [PMID: 34072929 PMCID: PMC8199023 DOI: 10.3390/ijms22115924] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2021] [Revised: 05/27/2021] [Accepted: 05/28/2021] [Indexed: 11/16/2022] Open
Abstract
Metalloid tellurium is characterized as a chemical element belonging to the chalcogen group without known biological function. However, its compounds, especially the oxyanions, exert numerous negative effects on both prokaryotic and eukaryotic organisms. Recent evidence suggests that increasing environmental pollution with tellurium has a causal link to autoimmune, neurodegenerative and oncological diseases. In this review, we provide an overview about the current knowledge on the mechanisms of tellurium compounds' toxicity in bacteria and humans and we summarise the various ways organisms cope and detoxify these compounds. Over the last decades, several gene clusters conferring resistance to tellurium compounds have been identified in a variety of bacterial species and strains. These genetic determinants exhibit great genetic and functional diversity. Besides the existence of specific resistance mechanisms, tellurium and its toxic compounds interact with molecular systems, mediating general detoxification and mitigation of oxidative stress. We also discuss the similarity of tellurium and selenium biochemistry and the impact of their compounds on humans.
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Diphenyl Ditelluride: Redox-Modulating and Antiproliferative Properties. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2019; 2019:2510936. [PMID: 31772702 PMCID: PMC6854260 DOI: 10.1155/2019/2510936] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/18/2018] [Revised: 03/09/2019] [Accepted: 07/11/2019] [Indexed: 11/17/2022]
Abstract
Tellurium is a rare element that has been regarded as a toxic, nonessential element, and its biological role is not clearly established. In addition, the biological effects of elemental tellurium and some of its organic and inorganic derivatives have been studied, leading to a set of interesting and promising applications. Diphenyl ditelluride (DPDT), an organic tellurium derivate, showed antioxidant, antigenotoxic, antimutagenic, and anticancer properties. The antioxidant and prooxidant properties of DPDT are complex and depend on experimental conditions, which may explain the contradictory reports of these properties. In addition, DPDT may exert its effects through different pathways, including distinct ones to those responsible for chemotherapy resistance phenotypes: transcription factors, membrane receptors, adhesion, structural molecules, cell cycle regulatory components, and apoptosis pathways. This review aims to present recent advances in our understanding of the biological effects, therapeutic potential, and safety of DPDT treatment. Moreover, original results demonstrating the cytotoxic effects of DPDT in different mammalian cell lines and systems biology analysis are included, and emerging approaches for possible future applications are inferred.
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Lu G, Lv C, Bao W, Li F, Zhang F, Zhang L, Wang S, Gao X, Zhao D, Wei W, Xie HY. Antimonene with two-orders-of-magnitude improved stability for high-performance cancer theranostics. Chem Sci 2019; 10:4847-4853. [PMID: 31183034 PMCID: PMC6520929 DOI: 10.1039/c9sc00324j] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2019] [Accepted: 04/01/2019] [Indexed: 12/13/2022] Open
Abstract
Although the antimonene (AM) nanomaterial is recently emerging as a new photothermal therapy (PTT) agent, its rapid degradation in physiological medium immensely limits its direct utilization. To this end, we herein engineered AM by the cooperation of dimension optimization, size control, and cell membrane (CM) camouflage. Compared with traditional AM nanosheets, the resulting AM nanoparticles (∼55 nm) cloaked with the CM (denoted as CmNPs) exhibited significantly improved stability and increased photothermal efficacy as well as superior tumor targeting capacity. After intravenous injection, the CmNPs enabled satisfactory photoacoustic/photothermal multimodal imaging at tumor sites. Meanwhile, the PTT together with the newly explored function of photodynamic therapy (PDT) achieved a potent combination therapy with few side effects. The maximized theranostic performance thus strongly recommends CmNPs as a safe and highly reliable modality for anticancer therapy.
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Affiliation(s)
- Guihong Lu
- School of Life Science , Beijing Institute of Technology , No. 5 South Zhong Guan Cun Street , Beijing 100081 , China . ;
| | - Chengliang Lv
- School of Life Science , Beijing Institute of Technology , No. 5 South Zhong Guan Cun Street , Beijing 100081 , China . ;
| | - Weier Bao
- State Key Laboratory of Biochemical Engineering , Institute of Process Engineering , Chinese Academy of Sciences , 1 North 2nd Street, Zhong Guan Cun , Beijing 100190 , China
| | - Feng Li
- School of Life Science , Beijing Institute of Technology , No. 5 South Zhong Guan Cun Street , Beijing 100081 , China . ;
| | - Fan Zhang
- School of Life Science , Beijing Institute of Technology , No. 5 South Zhong Guan Cun Street , Beijing 100081 , China . ;
| | - Lijun Zhang
- State Key Laboratory of Biochemical Engineering , Institute of Process Engineering , Chinese Academy of Sciences , 1 North 2nd Street, Zhong Guan Cun , Beijing 100190 , China
| | - Shuang Wang
- State Key Laboratory of Biochemical Engineering , Institute of Process Engineering , Chinese Academy of Sciences , 1 North 2nd Street, Zhong Guan Cun , Beijing 100190 , China
| | - Xiaoyong Gao
- State Key Laboratory of Biochemical Engineering , Institute of Process Engineering , Chinese Academy of Sciences , 1 North 2nd Street, Zhong Guan Cun , Beijing 100190 , China
| | - Dongxu Zhao
- School of Life Science , Beijing Institute of Technology , No. 5 South Zhong Guan Cun Street , Beijing 100081 , China . ;
| | - Wei Wei
- State Key Laboratory of Biochemical Engineering , Institute of Process Engineering , Chinese Academy of Sciences , 1 North 2nd Street, Zhong Guan Cun , Beijing 100190 , China
| | - Hai-Yan Xie
- School of Life Science , Beijing Institute of Technology , No. 5 South Zhong Guan Cun Street , Beijing 100081 , China . ;
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Burton C, Ma Y. Current Trends in Cancer Biomarker Discovery Using Urinary Metabolomics: Achievements and New Challenges. Curr Med Chem 2019; 26:5-28. [PMID: 28914192 DOI: 10.2174/0929867324666170914102236] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2016] [Revised: 07/26/2016] [Accepted: 08/08/2016] [Indexed: 12/20/2022]
Abstract
BACKGROUND The development of effective screening methods for early cancer detection is one of the foremost challenges facing modern cancer research. Urinary metabolomics has recently emerged as a potentially transformative approach to cancer biomarker discovery owing to its noninvasive sampling characteristics and robust analytical feasibility. OBJECTIVE To provide an overview of new developments in urinary metabolomics, cover the most promising aspects of hyphenated techniques in untargeted and targeted metabolomics, and to discuss technical and clinical limitations in addition to the emerging challenges in the field of urinary metabolomics and its application to cancer biomarker discovery. METHODS A systematic review of research conducted in the past five years on the application of urinary metabolomics to cancer biomarker discovery was performed. Given the breadth of this topic, our review focused on the five most widely studied cancers employing urinary metabolomics approaches, including lung, breast, bladder, prostate, and ovarian cancers. RESULTS As an extension of conventional metabolomics, urinary metabolomics has benefitted from recent technological developments in nuclear magnetic resonance, mass spectrometry, gas and liquid chromatography, and capillary electrophoresis that have improved urine metabolome coverage and analytical reproducibility. Extensive metabolic profiling in urine has revealed a significant number of altered metabolic pathways and putative biomarkers, including pteridines, modified nucleosides, and acylcarnitines, that have been associated with cancer development and progression. CONCLUSION Urinary metabolomics presents a transformative new approach toward cancer biomarker discovery with high translational capacity to early cancer screening.
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Affiliation(s)
- Casey Burton
- Department of Chemistry and Center for Single Nanoparticle, Single Cell, and Single Molecule Monitoring, Missouri University of Science and Technology, Rolla, MO, United States
| | - Yinfa Ma
- Department of Chemistry and Center for Single Nanoparticle, Single Cell, and Single Molecule Monitoring, Missouri University of Science and Technology, Rolla, MO, United States
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Heimfarth L, da Silva Ferreira F, Pierozan P, Mingori MR, Moreira JCF, da Rocha JBT, Pessoa-Pureur R. Astrocyte-neuron interaction in diphenyl ditelluride toxicity directed to the cytoskeleton. Toxicology 2017; 379:1-11. [PMID: 28137618 DOI: 10.1016/j.tox.2017.01.015] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2016] [Revised: 01/05/2017] [Accepted: 01/23/2017] [Indexed: 01/04/2023]
Abstract
Diphenylditelluride (PhTe)2 is a neurotoxin that disrupts cytoskeletal homeostasis. We are showing that different concentrations of (PhTe)2 caused hypophosphorylation of glial fibrillary acidic protein (GFAP), vimentin and neurofilament subunits (NFL, NFM and NFH) and altered actin organization in co-cultured astrocytes and neurons from cerebral cortex of rats. These mechanisms were mediated by N-methyl-d-aspartate (NMDA) receptors without participation of either L-type voltage-dependent calcium channels (L-VDCC) or metabotropic glutamate receptors. Upregulated Ca2+ influx downstream of NMDA receptors activated Ca2+-dependent protein phosphatase 2B (PP2B) causing hypophosphorylation of astrocyte and neuron IFs. Immunocytochemistry showed that hypophosphorylated intermediate filaments (IF) failed to disrupt their organization into the cytoskeleton. However, phalloidin-actin-FITC stained cytoskeleton evidenced misregulation of actin distribution, cell spreading and increased stress fibers in astrocytes. βIII tubulin staining showed that neurite meshworks are not altered by (PhTe)2, suggesting greater susceptibility of astrocytes than neurons to (PheTe)2 toxicity. These findings indicate that signals leading to IF hypophosphorylation fail to disrupt the cytoskeletal IF meshwork of interacting astrocytes and neurons in vitro however astrocyte actin network seems more susceptible. Our findings support that intracellular Ca2+ is one of the crucial signals that modulate the action of (PhTe)2 in co-cultured astrocytes and neurons and highlights the cytoskeleton as an end-point of the neurotoxicity of this compound. Cytoskeletal misregulation is associated with cell dysfunction, therefore, the understanding of the molecular mechanisms mediating the neurotoxicity of this compound is a matter of increasing interest since tellurium compounds are increasingly released in the environment.
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Affiliation(s)
- Luana Heimfarth
- Departamento de Bioquímica, Instituto de Ciências Básicas da Saúde, UFRGS, Porto Alegre, RS, Brazil
| | | | - Paula Pierozan
- Departamento de Bioquímica, Instituto de Ciências Básicas da Saúde, UFRGS, Porto Alegre, RS, Brazil
| | - Moara Rodrigues Mingori
- Departamento de Bioquímica, Instituto de Ciências Básicas da Saúde, UFRGS, Porto Alegre, RS, Brazil
| | | | | | - Regina Pessoa-Pureur
- Departamento de Bioquímica, Instituto de Ciências Básicas da Saúde, UFRGS, Porto Alegre, RS, Brazil.
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Ogra Y, Awaya Y, Anan Y. Comparison of accumulation of four metalloids in Allium sativum. BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY 2015; 94:604-608. [PMID: 25733447 DOI: 10.1007/s00128-015-1508-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2014] [Accepted: 02/25/2015] [Indexed: 06/04/2023]
Abstract
In this study, we evaluated the accumulation and metabolism of four metalloids: arsenic (As), selenium (Se), antimony (Sb), and tellurium (Te) in garlic to determine whether garlic can be used for the phytoremediation of those metalloids. Garlic was able to efficiently accumulate As and Se, the two-fourth-period metalloids. However, it was not able to accumulate Sb and Te, the two-fifth-period metalloids, because their bioaccumulation factors were below one. Speciation analyses revealed that four metalloids could be metabolized in garlic, although their metabolites could not be identified yet. Results also suggested that garlic was able to distinguish the metalloids in groups 15 and 16 and the fourth and fifth periods, i.e., As, Se, Sb, and Te. Therefore, garlic is one of the potential plants for the phytoremediation of the fourth-period metalloids.
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Affiliation(s)
- Yasumitsu Ogra
- Laboratory of Chemical Toxicology and Environmental Health, Showa Pharmaceutical University, Machida, Tokyo, 194-8543, Japan,
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Bruneau A, Fortier M, Gagne F, Gagnon C, Turcotte P, Tayabali A, Davis TA, Auffret M, Fournier M. In vitro immunotoxicology of quantum dots and comparison with dissolved cadmium and tellurium. ENVIRONMENTAL TOXICOLOGY 2015; 30:9-25. [PMID: 23893621 DOI: 10.1002/tox.21890] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2013] [Revised: 06/13/2013] [Accepted: 06/15/2013] [Indexed: 06/02/2023]
Abstract
The increasing use of products derived from nanotechnology has raised concerns about their potential toxicity, especially at the immunocompetence level in organisms. This study compared the immunotoxicity of cadmium sulfate/cadmium telluride (CdS/Cd-Te) mixture quantum dots (QDs) and their dissolved components, cadmium chloride (CdCl2 )/sodium telluride (NaTeO3 ) salts, and a CdCl2 /NaTeO3 mixture on four animal models commonly used in risk assessment studies: one bivalve (Mytilus edulis), one fish (Oncorhynchus mykiss), and two mammals (mice and humans). Our results of viability and phagocytosis biomarkers revealed that QDs were more toxic than dissolved metals for blue mussels. For other species, dissolved metals (Cd, Te, and Cd-Te mixture) were more toxic than the nanoparticles (NPs). The most sensitive species toward QDs, according to innate immune cells, was humans (inhibitory concentration [IC50 ] = 217 μg/mL). However, for adaptative immunity, lymphoblastic transformation in mice was decreased for small QD concentrations (EC50 = 4 μg/mL), and was more sensitive than other model species tested. Discriminant function analysis revealed that blue mussel hemocytes were able to discriminate the toxicity of QDs, Cd, Te, and Cd-Te mixture (Partial Wilk's λ = 0.021 and p < 0.0001). For rainbow trout and human cells, the immunotoxic effects of QDs were similar to those obtained with the dissolved fraction of Cd and Te mixture. For mice, the toxicity of QDs markedly differed from those observed with Cd, Te, and dissolved Cd-Te mixture. The results also suggest that aquatic species responded more differently than vertebrates to these compounds. The results lead to the recommendation that mussels and mice were most able to discriminate the effects of Cd-based NPs from the effects of dissolved Cd and Te at the immunocompetence level.
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Affiliation(s)
- Audrey Bruneau
- INRS-Institut Armand-Frappier, Laval, Quebec, H7V 1B7, Canada; Institut Universitaire Européen de la Mer Technopôle Brest-Iroise, Place Nicolas Copernic, Plouzané, 29280, France
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Miyashita SI, Groombridge AS, Fujii SI, Takatsu A, Chiba K, Inagaki K. Time-resolved ICP-MS measurement: a new method for elemental and multiparametric analysis of single cells. ANAL SCI 2014; 30:219-24. [PMID: 24521907 DOI: 10.2116/analsci.30.219] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Time-resolved inductively coupled plasma mass spectrometry (ICP-MS) has attracted much attention for elemental and multiparametric analysis of single cells, instead of a classical bulk analysis of large amount of cells after a dissolution. In the time-resolved measurement, cells are directly introduced into the plasma via nebulizing or micro drop dispensing, and then ion plumes corresponding to single cells are individually detected with a high time resolution. The sensitivity and cell throughput in the measurement strongly depend on the time resolution. A high cell introduction efficiency into the plasma supports for a reduction of cell consumption. Biomolecules can also be measured through the attachment of elemental tags, and then the amount distribution of elements and biomolecules in single cells can be evaluated, while providing information concerning cell-to-cell variations. By applying ICP time-of-flight mass spectrometry (ICP-TOFMS), multiparametric analysis of elements and biomolecules can be achieved similar to that by a flow cytometer. This article highlights the technical aspects of the time-resolved ICP-MS measurement technique for elemental and multiparametric analysis of single cells.
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Affiliation(s)
- Shin-ichi Miyashita
- Environmental Standards Section, National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology
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Comparsi B, Meinerz DF, Dalla Corte CL, Prestes AS, Stefanello ST, Santos DB, Souza DD, Farina M, Dafre AL, Posser T, Franco JL, Rocha JBT. N-acetylcysteine does not protect behavioral and biochemical toxicological effect after acute exposure of diphenyl ditelluride. Toxicol Mech Methods 2014; 24:529-35. [DOI: 10.3109/15376516.2014.920449] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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Tokumoto M, Kutsukake N, Yamanishi E, Katsuta D, Anan Y, Ogra Y. Arsenic (+3 oxidation state) methyltransferase is a specific but replaceable factor against arsenic toxicity. Toxicol Rep 2014; 1:589-595. [PMID: 28962272 PMCID: PMC5598430 DOI: 10.1016/j.toxrep.2014.08.011] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2014] [Revised: 08/22/2014] [Accepted: 08/23/2014] [Indexed: 01/31/2023] Open
Abstract
AS3MT catalyzed the methylation of arsenic. Selenium and tellurium were not methylated in the presence of AS3MT. AS3MT knockdown had no effect on the cytotoxicity of arsenic.
Inorganic metalloids, such as arsenic (As), antimony (Sb), selenium (Se), and tellurium (Te), are methylated in biota. In particular, As, Se, and Te are methylated and excreted in urine. The biomethylation is thought to be a means to detoxify the metalloids. The methylation of As is catalyzed by arsenic (+3 oxidation state) methyltransferase (AS3MT). However, it is still unclear whether AS3MT catalyzes the methylation of the other metalloids. It is also unclear whether other factors catalyze the As methylation instead of AS3MT. Recombinant human AS3MT (rhAS3MT) was prepared and used in the in vitro methylation of As, Se, and Te. As, but not Se and Te, was specifically methylated in the presence of rhAS3MT. Then, siRNA targeting AS3MT was introduced into human hepatocarcinoma (HepG2) cells. Although AS3MT protein expression was completely silenced by the gene knockdown, no increase in As toxicity was found in the HepG2 cells transfected with AS3MT-targeting siRNA. We conclude that AS3MT catalyzes the methylation of As and not other biomethylatable metalloids, such as Se and Te. We speculate that other methylation enzyme(s) also catalyze the methylation of As in HepG2 cells.
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Affiliation(s)
| | | | | | | | | | - Yasumitsu Ogra
- Corresponding author. Tel.: +81 42 721 1563; fax: +81 42 721 1563
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Signaling mechanisms and disrupted cytoskeleton in the diphenyl ditelluride neurotoxicity. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2014; 2014:458601. [PMID: 25050142 PMCID: PMC4090446 DOI: 10.1155/2014/458601] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/04/2014] [Accepted: 02/26/2014] [Indexed: 01/14/2023]
Abstract
Evidence from our group supports that diphenyl ditelluride (PhTe)2 neurotoxicity depends on modulation of signaling pathways initiated at the plasma membrane. The (PhTe)2-evoked signal is transduced downstream of voltage-dependent Ca2+ channels (VDCC), N-methyl-D-aspartate receptors (NMDA), or metabotropic glutamate receptors activation via different kinase pathways (protein kinase A, phospholipase C/protein kinase C, mitogen-activated protein kinases (MAPKs), and Akt signaling pathway). Among the most relevant cues of misregulated signaling mechanisms evoked by (PhTe)2 is the cytoskeleton of neural cells. The in vivo and in vitro exposure to (PhTe)2 induce hyperphosphorylation/hypophosphorylation of neuronal and glial intermediate filament (IF) proteins (neurofilaments and glial fibrillary acidic protein, resp.) in different brain structures of young rats. Phosphorylation of IFs at specific sites modulates their association/disassociation and interferes with important physiological roles, such as axonal transport. Disrupted cytoskeleton is a crucial marker of neurodegeneration and is associated with reactive astrogliosis and apoptotic cell death. This review focuses the current knowledge and important results on the mechanisms of (PhTe)2 neurotoxicity with special emphasis on the cytoskeletal proteins and their differential regulation by kinases/phosphatases and Ca2+-mediated mechanisms in developmental rat brain. We propose that the disrupted cytoskeletal homeostasis could support brain damage provoked by this neurotoxicant.
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Casas JS, García-Tasende MS, Sánchez A, Sánchez-González Á, Sordo J, Touceda Á, Vázquez-González M. Synthesis, characterization and in vitro toxicity assessment of DMPS-capped CdTe quantum dots. Polyhedron 2014. [DOI: 10.1016/j.poly.2013.12.034] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Ma C, Cheng S, Hu Z, Li Q, Zhang R, Zhang S. Synthesis and characterization of a novel o-tolyltelluronic trimethyltin ester and its cytotoxic assessment in vitro. Dalton Trans 2014; 43:671-9. [DOI: 10.1039/c3dt52326h] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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Mahto SK, Vinod T, Kim JK, Rhee SW. Cytotoxic Potentials of Tellurium Nanowires in BALB/3T3 Fibroblast Cells. B KOREAN CHEM SOC 2011. [DOI: 10.5012/bkcs.2011.32.9.3405] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Berriault CJ, Lightfoot NE. Occupational tellurium exposure and garlic odour. Occup Med (Lond) 2010; 61:132-5. [DOI: 10.1093/occmed/kqq178] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Ba LA, Döring M, Jamier V, Jacob C. Tellurium: an element with great biological potency and potential. Org Biomol Chem 2010; 8:4203-16. [PMID: 20714663 DOI: 10.1039/c0ob00086h] [Citation(s) in RCA: 210] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Tellurium has long appeared as a nearly 'forgotten' element in Biology, with most studies focusing on tellurite, tellurate and a handful of organic tellurides. During the last decade, several discoveries have fuelled a renewed interest in this element. Bioincorporation of telluromethionine provides a new approach to add heavy atoms to selected sites in proteins. Cadmium telluride (CdTe) nanoparticles are fluorescent and may be used as quantum dots in imaging and diagnosis. The antibiotic properties of tellurite, long known yet almost forgotten, have attracted renewed interest, especially since the biochemical mechanisms of tellurium cytotoxicity are beginning to emerge. The close chemical relationship between tellurium and sulfur also transcends into in vitro and in vivo situations and provides new impetus for the development of enzyme inhibitors and redox modulators, some of which may be of interest in the field of antibiotics and anticancer drug design.
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Affiliation(s)
- Lalla Aicha Ba
- Division of Bioorganic Chemistry, School of Pharmacy, Saarland University, PO Box 151150, D-66123, Saarbruecken, Germany
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Sulfate assimilation mediates tellurite reduction and toxicity in Saccharomyces cerevisiae. EUKARYOTIC CELL 2010; 9:1635-47. [PMID: 20675578 DOI: 10.1128/ec.00078-10] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Despite a century of research and increasing environmental and human health concerns, the mechanistic basis of the toxicity of derivatives of the metalloid tellurium, Te, in particular the oxyanion tellurite, Te(IV), remains unsolved. Here, we provide an unbiased view of the mechanisms of tellurium metabolism in the yeast Saccharomyces cerevisiae by measuring deviations in Te-related traits of a complete collection of gene knockout mutants. Reduction of Te(IV) and intracellular accumulation as metallic tellurium strongly correlated with loss of cellular fitness, suggesting that Te(IV) reduction and toxicity are causally linked. The sulfate assimilation pathway upstream of Met17, in particular, the sulfite reductase and its cofactor siroheme, was shown to be central to tellurite toxicity and its reduction to elemental tellurium. Gene knockout mutants with altered Te(IV) tolerance also showed a similar deviation in tolerance to both selenite and, interestingly, selenomethionine, suggesting that the toxicity of these agents stems from a common mechanism. We also show that Te(IV) reduction and toxicity in yeast is partially mediated via a mitochondrial respiratory mechanism that does not encompass the generation of substantial oxidative stress. The results reported here represent a robust base from which to attack the mechanistic details of Te(IV) toxicity and reduction in a eukaryotic organism.
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Ogra Y, Okubo E, Takahira M. Distinct uptake of tellurate from selenate in a selenium accumulator, Indian mustard (Brassica juncea). Metallomics 2010; 2:328-33. [DOI: 10.1039/c000088d] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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