Abstract
It is generally accepted that metallothioneins (MTs) are devoted to the regulation of the metabolism of essential trace metals and to chelation of toxic metals. Nowadays, there is increasing evidence that MTs also act as free radical scavengers. We employed wild type mouse embryo fibroblast cell line, GKA1, and its MT-null variant, GKA2, in order to correlate the presence of MTs to the sensitivity of cells to reactive oxygen species (ROS), spontaneously generated by the aerobic cellular metabolism, or chemically induced by hydrogen peroxide. The absence of MTs in GKA2 cells was unambiguously correlated to higher sensitivity to ROS attack, as evaluated by detection and quantification of 8-oxo-2′-deoxyguanosine (8-oxo-G), the first product of oxidative attack to DNA, using Fluorescence-Activated Cell Sorter (FACS). When compared to MT-null cell line, the wild type cells (GKA1) were less sensitive to ROS attack. In GKA1 cells, MT biosynthesis is readily induced by Cd2+ treatment, and such an induction caused a further decrease in sensitivity to ROS injury. On the contrary, the MT-null cells (GKA2) expressed no detectable metallothioneins either constitutively, or after heavy metal pretreatment. Indeed, in GKA2 cell line, pretreatment with Cd2+ did not reduce but even enhanced the oxidative stress.
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References
Abe T. 1997 Metallothionein '96. J UOEH 19(1), 57-61.
Andrews GK. 2000 Regulation of metallothionein gene expression by oxidative stress and metal ions. Biochem Pharmacol 59, 95-104.
Aruoma OI, Halliwell B, Dizdaroglu M. 1989 Iron ion-dependent modification of bases in DNA by the superoxide radicalgenerating system hypoxanthine/xanthine oxidase. J Biol Chem 264(22), 13024-13028.
Breen AP, Murphy JA. 1995 Reactions of oxyl radicals with DNA. Free Rad Biol Med 18(6), 1033-1077.
Cassino C, Cavigioglio G, Colangelo D, Galeotti F, Ghiglia A, Osella D, Tabbi, G. 2001 Water stability and cytotoxic activity relationship of a series of ferrocenium salts. Characterization of the radical production during the degradation process. J Inorg Biochem 86(1), 171.
Coyle P, Philcox JC, Carey LC, Rofe AM. 2002 Metallothionein: the multipurpose protein. Cell Mol Life Sci 59(4), 627-647.
Ercal N, Gurer-Orhan H, Aykin-Burns N. 2001 Toxic metals and oxidative stress part I: mechanisms involved in metal induced oxidative damage. Curr Top Med Chem 1(6), 529-539.
Frenkel K. 1992 Carcinogen-mediated oxidant formation and oxidative DNA damage. Pharmac Ther 53(1), 127-166.
Fridovich I. 1986 Biological effects of the superoxide radical. Arch Biochem Biophys 247(1), 1-11.
Halliwell B, Clement MV, Long LH. 2000 Hydrogen peroxide in the human body. FEBS Lett 486, 10-13.
Klaassen CD, Liu J. 1998 Metallothionein transgenic and knockout mouse models in the study of cadmium toxicity. J Toxicol Sci 23(2), 97-102.
Klaassen CD, Liu J, Choudhuri S. 1999 Metallothionein: an intracellular protein to protect against cadmium toxicity. Annu Rev Pharmacol Toxicol 39, 267-294.
Kondo Y, Yanagiya T, Himeno S, Yamabe Y, Schwartz D, Akimoto M, Lazo JS, Imura N. 1999 Simian virus 40-transformed metallothionein null cells showed increases sensitivity to cadmium but not to zinc, copper, mercury or nickel. Life Sci 64(11), 145-150.
Lazo JS, Kondo Y, Dellapiazza D, Michalska AE, Choo KHA, Pitt BR. 1995 Enhanced sensitivity to oxidative stress in cultured embryonic cells from transgenic mice deficient in MT I and II genes. J Biol Chem 270, 5506-5510.
Lazo JS, Kuo SM, Woo ES, Pitt BR. 1998 The protein thol metallothionein as an antioxidant and protectant against antineoplastic drugs. Chem Biol Interact 111-112, 255-262.
Mahboobi H, Viarengo A, Colangelo D, Osella D. 2003 Effect of metal-based anticancer drugs on wild type and metallothionein null cell lines. BioMetals 16(3), 403-409.
Mosmann T. 1983 Rapid colorimetric assay for cellular growth and survival: application to proliferation and cytotoxicity assays. J Immunol Meth 65, 55-63.
Osella D, Ferrali M, Zanello P, Laschi F, Fontani M, Nervi C, Cavigiolio, G. 2000 On the mechanism of the antitumor activity of ferrocenium derivatives. Inorg Chim Acta 306, 42-48.
Sato M, Bremner I. 1993 Oxygen Free Radicals and Metallothioneins, Free Radic Biol Med 14, 325-337.
Schwarz MA, Lazo JS, Yalowich JC, Reynolds I, Kagan VE, Tyurin V, Kim YM, Watkins SC, Pitt BR. 1994 Cytoplasmic metallothionein overexpression protects NIH 3T3 cells from tert-butyl hydroperoxide toxicity. J Biol Chem 269(21), 15238-15243.
Shaw CF, Stillman MJ, Suzuki KT. 1991 An overview of metalthiolate complex formation in metallothioneins. In: Stillman MJ, Shaw III CF, Suzuki KT (eds.), Metallothioneins: synthesis, structure and properties of metallothioneins, phytochelatins and metalthiolate complexes. Weinheim: VCH Verlagsgellschaft: 1-30.
Steenken S, Jovanovic SV. 1997 How Easily Oxidizable is DNA? One-electron reduction potentials of adenosine and guanosine radicals in aqueous solution. J Am Chem Soc 119, 617-618.
Suzuki KT. 1996 Structure and function of metallothionein. Nippon Rinsho 54(1), 33-39.
Suzuki Y, Apostolova MD, Cherian MG. 2000 Astrocyte cultures from transgenic mice to study the role of metallothionein in cytotoxicity of tert-butyl hydroperoxide. Toxicol 145, 51-62.
Tabbi G, Cassino C, Cavigiolio G, Colangelo D, Ghiglia A, Viano I, Osella D. 2002 Water Stability and Cytotoxic Activity Relationship of a Series of Ferrocenium Derivatives. ESR Insights on the Radical Production During the Degradation Process. J Med Chem 45(26), 5786-5796.
Viarengo A, Burlando B, Ceratto N, Panfoli I. 2000. Antioxidant Role of Metallothioneins: A Comparative Overview. Cell Mol Biol 46(2), 407-417.
You HJ, Lee KJ, Jeong HG. 2002 Overexpression of human metallothionein-III prevents hydrogen peroxide-induced stress in human fibroblasts. FEBS Letters 521, 175-179.
Zastawny TH, Altman SA, Randers-Eichhorn L, Madurawe R, Lumpkin JA, Dizdaroglu M, Rao G. 1995 DNA base modifications and membrane damage in cultured mammalian cells treated with iron ions. Free Rad Biol Med 18(6), 1013-1022.
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Colangelo, D., Mahboobi, H., Viarengo, A. et al. Protective effect of metallothioneins against oxidative stress evaluated on wild type and MT-null cell lines by means of flow cytometry. Biometals 17, 365–370 (2004). https://doi.org/10.1023/B:BIOM.0000029436.50572.bb
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DOI: https://doi.org/10.1023/B:BIOM.0000029436.50572.bb