Abstract
Mercury, one of the most widely diffused and hazardous organ-specific environmental contaminants, exists in a wide variety of physical and chemical states, each of which with unique characteristics of target organ specificity (Aleo et al. 2002). In nature the different forms of mercury include the metallic form, inorganic compounds, as well as alkyl, alkoxy, and aryl mercury compounds. Once introduced into the environment, mercury compounds can undergo a wide variety of transformations. In sediments, inorganic mercury (HgCl2) may be converted into methyl (CH3HgCl) and dimethyl (CH3CH2HgCl) forms by methanogenic bacteria. This biotransformation constitutes a serious environmental risk, given that CH3HgCl is the most toxic of the mercury compounds and accumulates in the aquatic food chain, eventually reaching human diets (Tchounwou et al. 2003). CH3HgCl has been an environmental concern to public health and regulatory agencies for over 50 years because of its neurotoxicity. Its association with nervous system toxicity in adults and infants near Minamata Bay, Japan, in the 1950s initiated environmental health research inquiries that continue to this day (Faustman et al. 2002). The three modern “faces” of mercury are our perceptions of risk from the exposure of billions of people to CH3HgCl in fish, mercury vapor from amalgam tooth fillings, and CH3CH2HgCl in the form of thimerosal added as an antiseptic to widely used vaccines (Clarkson 2002). Mercury genotoxicity has been usually attributed to its ability to react with the sulfhydryl groups of tubulin, impairing spindle function and leading to chromosomal aberrations and polyploidy (De Flora et al. 1994). Another important mechanism of mercury genotoxicity is its ability to produce free radicals that can cause DNA damage (Schurz et al. 2000; Ehrenstein et al. 2002). In vivo studies have demonstrated a clastogenic effect of mercury on people exposed to this element in their working environment or through the consumption of contaminated food or sometimes accidentally. Increased numbers of chromosome alterations and micronuclei have been reported in people who consume contaminated fish (Amorim et al. 2000; Franchi et al. 1994) and in miners and workers of explosive factories (Al-Sabti et al. 1992; Anwar and Gabal 1991). Negative results were also obtained in some cases (Hansteen et al. 1993; Mabille et al. 1984), demonstrating that cytogenetic monitoring of peripheral blood lymphocytes in individuals exposed to mercury from different sources may not be completely specific (De Flora et al. 1994). The effects of CH3HgCl contamination have been studied in an increasing way since the outbreaks in Japan and Iraq. Many of these studies had their focus on the neurological effects of CH3HgCl exposure in adult animals and used high doses of this compound (1,900–30,000 ppb = μg/L) to obtain its most severe effects (National Research Council 2000). Most of the in vitro studies with lymphocytes also used high doses (250–6,250 μg/L) of mercury compounds in order to evaluate its clastogenic effects (Ogura et al. 1996; Betti et al. 1992, 1993).
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Akiyama M, Oshima H, Nakamura M (2001) Genotoxicity of mercury used in chromosome aberration tests. Toxicol In Vitro 15:463–467
Aleo MF, Morandini F, Benttoni F, Tanganelli S, Vezzola A, Giuliani R, Steimberg N, Boniotti J, Bertasi B, Losio N, Apostoli P, Mazzoleni G (2002) In vitro study of the nephrotoxic mechanism of mercuric chloride. Med Lav 93:267–278
Al-Sabti K, Lloyd DC, Edwards AA, Stegnar P (1992) A survey of lymphocyte chromosomal damage in Slovenian workers exposed to occupational clastogens. Mutat Res 280:215–223
Amorim AIM, Mergler D, Bahia MO, Dubeau H, Miranda D, Lebel J, Burbano RR, Lucotte M (2000) Cytogenetic damage related to low levels of methylmercury contamination in the Brazilian Amazon. An Acad Bras Cienc 72:497–507
Andersen O, Ronne M, Nordberg G (1983) Effects of inorganic metal salts on chromosome length in human lymphocytes. Hereditas 98:65–70
Anwar WA, Gabal MS (1991) Cytogenetic study in workers occupationally exposed to mercury fulminate. Mutagenesis 6:189–192
Bahia MO, Amorim MIM, Burbano RR, Vincent S, Dubeau H (1999) Genotoxic effects of mercury on in vitro cultures of human cells. An Acad Bras Cienc 71:437–443
Betti C, Davini T, Barale R (1992) Genotoxic activity of methyl mercury chloride and dimethyl mercury in human lymphocytes. Mutat Res 281:255–260
Betti C, Barale R, Pool-Zobel BL (1993) Comparative studies on cytotoxic and genotoxic effects of two organic mercury compounds in lymphocytes and gastric mucosa cells of Sprague-Dawley rats. Environ Mol Mutagen 22:172–180
Choi H, Kim C (1984) The comparative effects of methylmercury chloride and mercuric chloride upon DNA synthesis in mouse fetal astrocytes in vitro. Exp Mol Pathol 41:371–376
Clarkson RW (2002) The three modern faces of mercury. Environ Health Perspect 110:11–23
De Flora S, Benniceli C, Bagnasco M (1994) Genotoxicity of mercury compounds. A review. Mutat Res 31:57–79
Ehrenstein C, Shu P, Wickenheiser EB, Hirner AV, Dolfen M, Emons H, Obe G (2002) Methyl mercury uptake and associations with the induction of chromosomal aberrations in Chinese hamster ovary (CHO) cells. Chem Biol Interact 141:259–274
Faustman EM, Ponce RA, Ou YC, Mendonza MA, Lewandowski R, Kavanagh T (2002) Investigations of methylmercury-induced alterations in neurogenesis. Environ Health Perspect 110:859–864
Franchi E, Loprieno G, Ballardin M, Petrozzi L, Migliore L (1994) Cytogenetic monitoring of fishermen with environmental mercury exposure. Mutat Res 320:23–29
Grover P, Saleha Banu B, Dana Devi K, Begum S (2001) In vivo genotoxic effects of mercuric chloride in rat peripheral blood leucocytes using comet assay. Toxicology 167:191–197
Hall EJ (2000) Cell survival curves. In: Hall EJ (ed) Radiobiology for the radiologist, 5th edn. Lippincott, Williams and Wilkins, Philadelphia, pp 32–50
Hansteen H, Ellingsen DG, Clausen KO, Kjuus H (1993) Chromosome aberrations in chloralkali workers previously exposed to mercury vapour. Scand J Work Environ Health 19:375–381
Lee CH, Lin RH, Liu SH, Lin-Shiau SY (1997) Distinct genotoxicity of phenylmercury acetate in human lymphocytes as compared with other mercury compounds. Mutat Res 392:269–276
Mabille V, Roels H, Jacquet P, Léonard A, Lauweris R (1984) Cytogenetic examination of leucocytes of workers exposed to mercury vapour. Int Arch Occup Environ Health 53:257–260
National Research Council, Committee on the Toxicological Effects of Methylmercury (2000) Toxicological effects of methylmercury. National Academy Press, Washington, DC
Ogura H, Takeuchi T, Morimoto K (1996) A comparison of the 8-hydroxydeoxyguanosine, chromosome aberrations and micronucleus techniques for the assessment of the genotoxicity of mercury compounds in human blood lymphocytes. Mutat Res 340:175–182
Preston RJ, Dean BJ, Galloway S, Holden H, McFee AF, Shelby M (1987) Mammalian in vivo cytogenetic assay: analysis of chromosomal aberrations in bone marrow cells. Mutat Res 189:157–165
Schurz F, Sabater-Vilar M, Fink-Gremmels J (2000) Mutagenicity of mercury chloride and mechanisms of cellular defence: the role of metal-binding proteins. Mutagenesis 15:525–530
Tchounwou PB, Ayensu WK, Ninashvili N, Sutton D (2003) Environmental exposure to mercury and its toxicopathologic implications for public health. Environ Toxicol 18:149–175
Their R, Bonacker D, Stoiber T, Bohm KJ, Wang M, Unger E, Bolt HM, Degen G (2003) Interaction of metal salts with cytoskeletal motor protein systems. Toxicol Lett 140–141:75–81
Author information
Authors and Affiliations
Rights and permissions
Copyright information
© 2014 Springer India
About this chapter
Cite this chapter
Nabi, S. (2014). Chromosomal Aberrations. In: Toxic Effects of Mercury. Springer, New Delhi. https://doi.org/10.1007/978-81-322-1922-4_24
Download citation
DOI: https://doi.org/10.1007/978-81-322-1922-4_24
Published:
Publisher Name: Springer, New Delhi
Print ISBN: 978-81-322-1921-7
Online ISBN: 978-81-322-1922-4
eBook Packages: Biomedical and Life SciencesBiomedical and Life Sciences (R0)