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Metallothionein in Cytotoxicity and Genotoxicity of Metals

  • M. George Cherian
  • Peter J. Ferguson
Chapter
Part of the NATO ASI Series book series (ASEN2, volume 26)

Abstract

Humans are exposed to metals, both essential and non-essential from a variety of sources in the environment. Several metal ions are essential for humans because they play a vital role in important biological functions. Because of their charge, metal ions can easily form complexes with various ligands such as amino acids, proteins and nucleic acids. These interactions are essential not only for the biological functions of metals, but also for protection against their toxicity. The presence of metals in active sites of certain enzymes can facilitate oxido-reductive and group transfer reactions. In addition, the formation of complexes of metals can influence their solubility, transport through cellular membranes, excretion, and storage. Metals can also affect the expression of certain genes, especially after binding to specific transcription factors. Some of these interactions are specific while others are more general. In certain cases, the direct recognition signals, conferred by specific metal-binding sites on cell membranes, can result in signal transduction reactions in specific organs. A number of metals, particularly from industrial sources, are non-essential and are toxic to cells and the whole organism. This review will discuss the cytotoxicity and genotoxicity of certain metals and the protective role of metal-binding proteins, such as metallothionein, in metal toxicity.

Keywords

Growth Inhibitory Factor Cadmium Salt Anticancer Drug Resistance Metallothionein Synthesis Free Ionic Form 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media Dordrecht 1997

Authors and Affiliations

  • M. George Cherian
    • 1
  • Peter J. Ferguson
    • 1
  1. 1.Department of PathologyUniversity of Western OntarioLondonCanada

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