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Copper and zinc uptake and hsp70 expression in HepG2 cells
C Urani1, P Melchioretto, F Morazzoni
1Dipartimento di Scienze dell'Ambiente e del Territorio, Università degli Studi di Milano Bicocca, p.zza della Scienza 1, 20126 Milan, Italy.
Summary
This study investigated copper and zinc accumulation in liver cells and the induction of heat shock protein 70 kDa (hsp70). Pre-exposure to hsp70 protected cells from metal toxicity.
Area of Science:
- * Cellular and Molecular Toxicology
- * Environmental Health Sciences
Background:
- * HepG2 cells, a model for liver parenchymal cells, are susceptible to metal toxicity.
- * Essential metals like copper (Cu) and zinc (Zn) can exhibit toxic effects.
- * The liver plays a key role in metal uptake, transport, and detoxification.
Purpose of the Study:
- * To examine the accumulation of Cu and Zn in HepG2 cells.
- * To analyze the induction of heat shock protein 70 kDa (hsp70) following metal exposure.
- * To investigate potential synergistic effects of combined Cu and Zn exposure.
Main Methods:
- * Utilized HepG2 cells as an in vitro model system.
- * Measured metal accumulation using ICP-AES.
- * Assessed hsp70 induction in response to metal exposure.
Main Results:
- * Time-dependent accumulation of Cu and Zn was observed when applied individually.
- * Combined exposure to Cu and Zn resulted in increased Zn accumulation.
- * Heat shock protein 70 kDa (hsp70) expression preceded intracellular metal accumulation.
- * Sublethal hsp70 induction conferred protection against metal-induced cytotoxicity.
Conclusions:
- * HepG2 cells effectively model hepatic metal handling and toxicity responses.
- * Combined copper and zinc exposure can enhance zinc accumulation.
- * Heat shock protein 70 kDa (hsp70) plays a protective role against metal cytotoxicity, with expression preceding metal uptake.