title: Erythropoietin improves neuronal proliferation in dentate gyrus of hippocampal formation in an animal model of Alzheimer's disease.
abstract: BACKGROUND
  Alzheimer's disease (AD) is a prevalent disorder with severe learning and memory defects. Because it has been demonstrated that erythropoietin (EPO) has positive effects on the central nervous system, the aim of this study was to evaluate the effect of EPO on neuronal proliferation in dentate gyrus of hippocampal formation in a well-defined model for AD.
  
  
  METHODS
  A rat model of sporadic dementia of Alzheimer's type was established by a bilateral intracerebroventricular injection of streptozotocin (ICV-STZ). Impairment of learning and memory was confirmed 2 weeks after ICV-STZ injection by passive avoidance learning test and then rats were divided into fourgroups:Control, control-EPO, Alzheimer and Alzheimer-EPO. EPO was injected intraperitoneally every other day with a dose of 5000 IU/kg and, finally, the rats were anesthetized and decapitated for immunohistochemical study and neurogenesis investigation (by Ki67 method) in dentate gyrus of hippocampal formation.
  
  
  RESULTS
  The results driven from the histological study showed that EPO significantly increases neuronal proliferation in dentate gyrus of hippocampus in the Alzheimer-EPO group compared with the control, control-EPO and Alzheimer groups; however, there were no differences between the other groups.
  
  
  CONCLUSIONS
  Our results show that even though EPO in intact animals doesnot change neurogenesis in dentate gyrus, it can nonetheless significantly increase neurogenesis if there is an underlying disorder like neurodegenerative diseases.
authors: Physiology Research Center, Kashan University of Medical Sciences, Kashan, Iran.
authors: Zohreh
authors: Z
authors: Arabpoor
authors: Gholamali
authors: G
authors: Hamidi
authors: Bahman
authors: B
authors: Rashidi
authors: Moloud
authors: M
authors: Shabrang
authors: Hojjatallah
authors: H
authors: Alaei
authors: Mohammad Reza
authors: MR
authors: Sharifi
authors: Mahmoud
authors: M
authors: Salami
authors: Hamid Reza Dehghani
authors: HR
authors: Dolatabadi
authors: Parham
authors: P
authors: Reisi
keywords: Alzheimer's; erythropoietin; neuronal proliferation; rat; streptozotocin