Neuroprotective effects of erythropoietin in the rat hippocampus after pilocarpine-induced status epilepticus

Neurobiol Dis. 2007 Feb;25(2):412-26. doi: 10.1016/j.nbd.2006.10.009. Epub 2006 Dec 12.

Abstract

Neuroprotective functions of erythropoietin (Epo) are thought to involve a heteroreceptor composed of both Epo receptor (Epo-R) and common beta chain (betac). Here, we measured the response of hippocampal Epo system components (Epo, Epo-R and betac) during neurodegenerative processes following pilocarpine-induced status epilepticus (SE), and examined whether recombinant human Epo (rHuEpo) could support neuronal survival. We evidence that Epo is induced in astroglia following SE, in particular within areas displaying delayed neuronal death. In addition, we demonstrate for the first time that rHuEpo reduces considerably hippocampal neurodegeneration following SE. rHuEpo may thus supplement astroglial induction of Epo to promote enhanced hippocampal neuronal survival following SE. We also show that Epo-R is expressed by neurons and astrocytes mainly, while betac is barely detectable in basal conditions and induced in reactive microglia exclusively following SE. Altogether, our results suggest that Epo/rHuEpo exerts neuroprotection, through Epo-R signaling and independently of betac, and, therefore, may be anti-epileptogenic.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Anticonvulsants / pharmacology
  • Astrocytes / drug effects
  • Astrocytes / metabolism
  • Cell Survival / drug effects
  • Cell Survival / physiology
  • Convulsants / antagonists & inhibitors
  • Erythropoietin / pharmacology*
  • Hippocampus / drug effects*
  • Hippocampus / metabolism
  • Hippocampus / physiopathology
  • Macromolecular Substances / metabolism
  • Male
  • Muscarinic Agonists / pharmacology
  • Neurons / drug effects
  • Neurons / metabolism
  • Neuroprotective Agents / pharmacology*
  • Pilocarpine / antagonists & inhibitors
  • Pilocarpine / toxicity
  • Protein Subunits / drug effects
  • Protein Subunits / metabolism
  • Rats
  • Rats, Sprague-Dawley
  • Receptors, Erythropoietin / agonists
  • Receptors, Erythropoietin / metabolism
  • Signal Transduction / drug effects
  • Signal Transduction / physiology
  • Status Epilepticus / chemically induced
  • Status Epilepticus / drug therapy*
  • Status Epilepticus / physiopathology

Substances

  • Anticonvulsants
  • Convulsants
  • Macromolecular Substances
  • Muscarinic Agonists
  • Neuroprotective Agents
  • Protein Subunits
  • Receptors, Erythropoietin
  • Pilocarpine
  • Erythropoietin