The browser you are using is not supported by this website. All versions of Internet Explorer are no longer supported, either by us or Microsoft (read more here: https://www.microsoft.com/en-us/microsoft-365/windows/end-of-ie-support).

Please use a modern browser to fully experience our website, such as the newest versions of Edge, Chrome, Firefox or Safari etc.

Traces of copper ions deplete glutathione in human hepatoma cell cultures with low cysteine content

På svenska

Author

Summary, in English

Background: Cell death induced by intracellutar glutathione depletion has been reported to be dependent on the presence of trace amounts of extracellular copper ions. Since little is known about the relationship between glutathione depletion and copper homeostasis, we have in the present study further investigated the role of low amounts of copper ions in glutathione depletion. Methods: Glutathione turnover was investigated in HeLa and hepatoma cell cultures with normal and low cysteine content in the presence of copper ions (1 and 10 mu mol/L) and two other glutathione-stimulating agents (lipoic acid and mercury ions). Results: Copper ions (10 mu mol/L) caused relatively small increases in total amount of glutathione (the sum of the intracellular and the extracellular amount of glutathione) in HeLa and hepatoma cell cultures with normal cysteine levels (420 nmol/mL) compared to control cell cultures, whereas lipoic acid and mercury ions strongly increased total glutathione in both types of cell cultures. Lower amount of total glutathione was observed in cell cultures with a lower cysteine levels (84 nmol/mL), which is similar to that in human plasma. A strongly decreased total amount of glutathione in the presence of copper ions was observed in hepatoma cell cultures with lower cysteine levels, whereas the other agents showed effects similar to those described for cell cultures with normal cysteine levels. Conclusion: Glutathione synthesis in hepatoma cell cultures is probably more sensitive to a low cysteine level than HeLa cell cultures, and the presence of copper ions further decreases the availability of cysteine probably by increasing the disultide binding to cysteine residues in extracellular proteins, which causes a further decrease of total glutathione. (c) 2007 Elsevier Ireland Ltd. All rights reserved.

Publishing year

2007

Language

English

Pages

56-62

Publication/Series

Chemico-Biological Interactions

Volume

167

Issue

1

Document type

Journal article

Publisher

Elsevier

Topic

  • Biochemistry and Molecular Biology

Keywords

  • hepatoma cell lines
  • HeLa cell lines
  • copper ions
  • glutathione

Status

Published

ISBN/ISSN/Other

  • ISSN: 1872-7786