ZFIN ID: ZDB-PUB-090106-36
Induction of phase II enzymes and hsp70 genes by copper sulfate through the electrophile-responsive element (EpRE): insights obtained from a transgenic zebrafish model carrying an orthologous EpRE sequence of mammalian origin
Almeida, D.V., da Silva Nornberg, B.F., Geracitano, L.A., Barros, D.M., Monserrat, J.M., and Marins, L.F.
Date: 2010
Source: Fish physiology and biochemistry   36(3): 347-353 (Journal)
Registered Authors: Almeida, Daniela Volcan, Marins, Luis Fernando
Keywords: Electrophile-responsive element, Glutamate cysteine ligase catalytic subunit, Glutathione-S-transferase, HSP70, Luciferase and transgenic fish
MeSH Terms:
  • Animals
  • Animals, Genetically Modified
  • Catalytic Domain/genetics
  • Conserved Sequence/genetics
  • Copper Sulfate/toxicity*
  • DNA Primers/genetics
  • Gene Expression Regulation/drug effects*
  • Glutamate-Cysteine Ligase/metabolism*
  • Glutathione Transferase/metabolism*
  • HSP70 Heat-Shock Proteins/metabolism*
  • Inactivation, Metabolic/genetics
  • Inactivation, Metabolic/physiology
  • Mice
  • NF-E2-Related Factor 2/genetics
  • NF-E2-Related Factor 2/metabolism*
  • Response Elements/genetics*
  • Reverse Transcriptase Polymerase Chain Reaction
  • Zebrafish
PubMed: 19116768 Full text @ Fish Physiol. Biochem.
We have evaluated the homology of the electrophile-responsive element (EpRE) core sequence, a binding site for the Nrf2 transcription factor, in the proximal promoters of the mouse and zebrafish glutathione-S-transferase (gst), glutamate cysteine ligase catalytic subunit (gclc) and heat shock protein 70 (hsp70) genes. The EpRE sites identified for both species in the three analyzed genes showed a high similarity with the putative EpRE core sequence. We also produced a transgenic zebrafish model carrying a transgene comprised of the luciferase (luc) reporter gene under transcriptional control of a mouse EpRE sequence. This transgenic model was exposed to copper sulfate, and the reporter gene was significantly activated. The endogenous gst, gclc and hsp70 zebrafish genes were analyzed in the EpRE-Luc transgenic zebrafish and showed an expression pattern similar to that of the reporter transgene used. Our results demonstrate that EpRE is conserved between mouse and zebrafish for detoxification-related genes and that the development of genetically modified models using this responsive element to drive the expression of reporter genes can be an important tool in understanding the action mechanism of aquatic pollutants.