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. 1981 Aug;40:181–188. doi: 10.1289/ehp.8140181

Relationship between metal toxicity to subcellular systems and the carcinogenic response.

K S Squibb, B A Fowler
PMCID: PMC1568816  PMID: 7023932

Abstract

The effects of metals on subcellular organelle functions have been reviewed in relation to carcinogenesis. Perturbations of the normal uptake and metabolism of carcinogens can arise through changes in microsomal enzyme activities, membrane permeabilities, and cell turnover. Metal effects on heme-dependent oxidative functions are well documented and are primarily manifested by increased heme degradation rates (microsomal heme oxygenase activity), decreased heme production (mitochondrial and cytosolic heme biosynthetic enzymes) and, in the case of a few metals, through nuclear effects of metals on the induction of microsomal enzymes. Many metals are accumulated by lysosomes, but known effects of metals on the function of these organelles in sequestering and storing organic compounds are few. Studies of changes in plasma or mitochondrial membrane permeabilities by metals have centered mainly on the susceptibility of membrane ATPase activities to metal ion alteration and on the involvement of metals in lipid peroxidation and free radical formation. Knowledge of the effects of metals on subcellular organelle functions should aid in the understanding of the mechanisms by which metal ions may play a role in the carcinogenic response.

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Selected References

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