Signals mediating Klotho-induced neuroprotection in hippocampal neuronal cells

Acta Neurobiol Exp (Wars). 2015;75(1):60-71. doi: 10.55782/ane-2015-2016.

Abstract

The erythropoietin (Epo) receptor (EpoR) is expressed in the brain and was shown to have neuroprotective effects against brain damage in animal models. A recent study indicated that EpoR and its activity are the downstream effectors of Klotho for cytoprotection in the kidney. Thus, we propose that Klotho can stimulate the expression of EpoR in neuronal cells to enhance Epo-mediated protection. H19-7 hippocampal neuronal cells were treated with recombinant Klotho. In H19-7 cells, Klotho increased the expression of both the EpoR protein and mRNA. Klotho also enhanced the transcription activity of the EpoR promoter in H19-7 cells. Moreover, Klotho augmented the Epo-triggered phosphorylation of Jak2 and Stat5 and protected H19-7 cells from hydrogen peroxide cytotoxicity. The silencing of EpoR abolished the protective effect of Klotho against peroxide-induced cytotoxicity. Finally, the silencing of GATA1 diminished the Klotho-induced increase in EpoR protein and mRNA expression as well as its promoter activity. In conclusion, Klotho increased EpoR expression in neuronal cells through GATA1, thereby enabling EpoR to function as a cytoprotective protein against oxidative injury.

MeSH terms

  • Animals
  • Cell Count
  • Cell Line
  • GATA1 Transcription Factor / metabolism
  • Glucuronidase / metabolism
  • Glucuronidase / pharmacology*
  • Hippocampus / cytology*
  • Humans
  • Hydrogen Peroxide / pharmacology
  • Hydroxymethylbilane Synthase / genetics
  • Hydroxymethylbilane Synthase / metabolism
  • Janus Kinase 2 / genetics
  • Janus Kinase 2 / metabolism
  • Klotho Proteins
  • Neurons / drug effects*
  • Neuroprotective Agents / pharmacology*
  • RNA Interference / physiology
  • RNA, Small Interfering / pharmacology
  • Rats
  • Receptors, Erythropoietin / genetics
  • Receptors, Erythropoietin / metabolism
  • STAT5 Transcription Factor / genetics
  • STAT5 Transcription Factor / metabolism
  • Signal Transduction / drug effects*
  • Signal Transduction / genetics
  • Transfection
  • Up-Regulation / drug effects

Substances

  • GATA1 Transcription Factor
  • GATA1 protein, human
  • Neuroprotective Agents
  • RNA, Small Interfering
  • Receptors, Erythropoietin
  • STAT5 Transcription Factor
  • Hydrogen Peroxide
  • Hydroxymethylbilane Synthase
  • Jak2 protein, rat
  • Janus Kinase 2
  • Glucuronidase
  • Klotho Proteins