Nrf2-mediated adaptive response to cadmium-induced toxicity involves protein kinase C delta in human 1321N1 astrocytoma cells

Akeem O Lawal, Elizabeth M Ellis

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Cadmium (Cd) is a toxic heavy metal, and exposure to Cd causes a range of changes within the cell. At high concentrations, Cd causes damage to cells via a range of mechanisms. At low concentrations, Cd can stimulate expression of genes that are part of an adaptive response. In this study, we have used the astrocytoma cell line 1321N1 as a model to investigate the induction of protective enzymes in response to Cd. We have shown that expression of NAD(P)H:quinone oxidoreductase and haem oxygenase enzymes are induced as the protein level by -fold and -fold, and in response to 5 and 10μM Cd. Levels of NQO1 and HO1 mRNA are also increased by -fold and -fold following 24h exposure to 5 and 10μM cadmium. An increase in the nuclear accumulation of the transcription factor Nrf2 was also observed following Cd treatment. Through the use of the protein kinase C inhibitor bisindolylmaleimide (VIII) acetate we have demonstrated the involvement PKC in the Nrf2-mediated response of 1321N1 cells to 5-10μM Cd. We have also shown through the used of 10μM rottlerin that PKCδ is the isoform responsible for mediating this response.
LanguageEnglish
Pages54-62
Number of pages9
JournalEnvironmental toxicology and pharmacology
Volume32
Issue number1
DOIs
Publication statusPublished - Jul 2011

Fingerprint

Protein Kinase C-delta
Astrocytoma
Cadmium
Toxicity
human PRKCD protein
Heme Oxygenase (Decyclizing)
Enzyme Induction
Protein C Inhibitor
Poisons
Enzymes
Protein Kinase Inhibitors
Heavy Metals
NAD
Protein Kinase C
Oxidoreductases
Protein Isoforms
Acetates
Transcription Factors
Genes
Cells

Keywords

  • cadmium
  • antioxidants
  • cytosolic
  • nuclear
  • transcription
  • rottlerin
  • Nrf2

Cite this

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abstract = "Cadmium (Cd) is a toxic heavy metal, and exposure to Cd causes a range of changes within the cell. At high concentrations, Cd causes damage to cells via a range of mechanisms. At low concentrations, Cd can stimulate expression of genes that are part of an adaptive response. In this study, we have used the astrocytoma cell line 1321N1 as a model to investigate the induction of protective enzymes in response to Cd. We have shown that expression of NAD(P)H:quinone oxidoreductase and haem oxygenase enzymes are induced as the protein level by -fold and -fold, and in response to 5 and 10μM Cd. Levels of NQO1 and HO1 mRNA are also increased by -fold and -fold following 24h exposure to 5 and 10μM cadmium. An increase in the nuclear accumulation of the transcription factor Nrf2 was also observed following Cd treatment. Through the use of the protein kinase C inhibitor bisindolylmaleimide (VIII) acetate we have demonstrated the involvement PKC in the Nrf2-mediated response of 1321N1 cells to 5-10μM Cd. We have also shown through the used of 10μM rottlerin that PKCδ is the isoform responsible for mediating this response.",
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Nrf2-mediated adaptive response to cadmium-induced toxicity involves protein kinase C delta in human 1321N1 astrocytoma cells. / Lawal, Akeem O; Ellis, Elizabeth M.

In: Environmental toxicology and pharmacology, Vol. 32, No. 1, 07.2011, p. 54-62.

Research output: Contribution to journalArticle

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AU - Lawal, Akeem O

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