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Neuroprotective effects of erythropoietin against hypoxic injury via modulation of the mitogen-activated protein kinase pathway and apoptosis

  • Jeong, Ji Eun (Department of Pediatrics, Daegu Catholic University Medical Center, Catholic University of Daegu School of Medicine) ;
  • Park, Jae Hyun (Department of Pediatrics, Keimyung University Dongsan Medical Center, Keimyung University School of Medicine) ;
  • Kim, Chun Soo (Department of Pediatrics, Keimyung University Dongsan Medical Center, Keimyung University School of Medicine) ;
  • Lee, Sang Lak (Department of Pediatrics, Keimyung University Dongsan Medical Center, Keimyung University School of Medicine) ;
  • Chung, Hai Lee (Department of Pediatrics, Daegu Catholic University Medical Center, Catholic University of Daegu School of Medicine) ;
  • Kim, Woo Taek (Department of Pediatrics, Daegu Catholic University Medical Center, Catholic University of Daegu School of Medicine) ;
  • Lee, Eun Joo (Department of Pediatrics, Kyungpook National University Hospital, Kyungpook National University School of Medicine)
  • 투고 : 2016.12.30
  • 심사 : 2017.04.11
  • 발행 : 2017.06.15

초록

Purpose: Hypoxic-ischemic encephalopathy is a significant cause of neonatal morbidity and mortality. Erythropoietin (EPO) is emerging as a therapeutic candidate for neuroprotection. Therefore, this study was designed to determine the neuroprotective role of recombinant human EPO (rHuEPO) and the possible mechanisms by which mitogen-activated protein kinase (MAPK) signaling pathway including extracellular signal-regulated kinase (ERK1/2), JNK, and p38 MAPK is modulated in cultured cortical neuronal cells and astrocytes. Methods: Primary neuronal cells and astrocytes were prepared from cortices of ICR mouse embryos and divided into the normoxic, hypoxia (H), and hypoxia-pretreated with EPO (H+EPO) groups. The phosphorylation of MAPK pathway was quantified using western blot, and the apoptosis was assessed by caspase-3 measurement and terminal deoxynucleotidyl transferase dUTP nick end labeling assay. Results: All MAPK pathway signals were activated by hypoxia in the neuronal cells and astrocytes (P<0.05). In the neuronal cells, phosphorylation of ERK-1/-2 and apoptosis were significantly decreased in the H+EPO group at 15 hours after hypoxia (P<0.05). In the astrocytes, phosphorylation of ERK-1/-2, p38 MAPK, and apoptosis was reduced in the H+EPO group at 15 hours after hypoxia (P<0.05). Conclusion: Pretreatment with rHuEPO exerts neuroprotective effects against hypoxic injury reducing apoptosis by caspase-dependent mechanisms. Pathologic, persistent ERK activation after hypoxic injury may be attenuateed by pretreatment with EPO supporting that EPO may regulate apoptosis by affecting ERK pathways.

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참고문헌

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  5. The Role of PI3K/AKT and MAPK Signaling Pathways in Erythropoietin Signalization vol.22, pp.14, 2017, https://doi.org/10.3390/ijms22147682