Glucocorticoids Alter Gene Expression and Antiviral Responses in Atlantic Salmon Red Blood Cells

Strategic Insights -

A recent study published in Veterinary Research has investigated the effects of glucocorticoid receptor activation on gene expression and antiviral responses in Atlantic salmon red blood cells. The research, conducted at the Norwegian Veterinary Institute, has provided valuable insights into the regulation of gene expression in response to glucocorticoids. The study found that dexamethasone, an agonist for glucocorticoid receptors, significantly upregulated 156 genes in isolated Atlantic salmon red blood cells, including the genes fkbp5, klf9, and ddit4. These genes were found to be induced up to 100-fold and persisted for up to two weeks post-stimulation, indicating their potential as biomarkers for chronic stress exposure.

Key Takeaways:

  • The study found that glucocorticoids have a profound effect on gene expression in Atlantic salmon red blood cells, indicating a potential mechanism for altering functions of these cells.
  • Dexamethasone significantly upregulated 156 genes in isolated Atlantic salmon red blood cells, including the genes fkbp5, klf9, and ddit4.
  • The upregulation of fkbp5 persisted for up to two weeks post-RBC stimulation, indicating its potential as a biomarker candidate for chronic stress exposure.
  • The study compared ex vivo transcriptional responses in RBCs with responses in blood cells from Atlantic salmon injected with hydrocortisone and found that ddit4 may be the most promising biomarker candidate for stress response in vivo.
  • Glucocorticoids also downregulated antiviral and proteasome genes triggered by double-stranded RNA in RBCs, potentially altering the antiviral response.

Statistics:

  • 156 genes were found to be significantly upregulated in response to dexamethasone stimulation.
  • Fkbp5, Klf9, and ddit4 were induced up to 100-fold in response to dexamethasone stimulation.
  • The upregulation of fkbp5 persisted for up to two weeks post-RBC stimulation.
  • 100-fold induction of antiviral and proteasome genes was observed in response to glucocorticoid receptor activation.

Sources:

  • "Effects of glucocorticoid receptor activation on gene expression and antiviral responses in Atlantic salmon (Salmo salar L.) red blood cells." Veterinary Research, 2025;56(1):188.
  • Veterinary Research can be contacted at: Bmc, Campus, 4 Crinan St, London N1 9XW, England.