한국수정란이식학회지 (Journal of Embryo Transfer)

  • 제32권1호
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  • Pages.17-24
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  • 2017
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  • 2508-755X(pISSN)
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  • 2288-0178(eISSN)
한국수정란이식학회 (The Korean Society of Embryo Transfer)
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Ganglioside GD1a Activates the Phosphorylation of EGFR in Porcine Oocytes Maturation in vitro

  • Park, Hyo-Jin (Department of Biotechnology, College of Engineering, Daegu University) ;
  • Kim, Jin-Woo (Department of Biotechnology, College of Engineering, Daegu University) ;
  • Park, Jae-Young (Department of Biotechnology, College of Engineering, Daegu University) ;
  • Yang, Seul-Gi (Department of Biotechnology, College of Engineering, Daegu University) ;
  • Jung, Jae-Min (Department of Biotechnology, College of Engineering, Daegu University) ;
  • Kim, Min-Ji (Department of Biotechnology, College of Engineering, Daegu University) ;
  • Koo, Deog-Bon (Department of Biotechnology, College of Engineering, Daegu University)
  • 투고 : 2016.11.21
  • 심사 : 2017.03.15
  • 발행 : 2017.03.31
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초록

Ganglioside GD1a is specifically formed by the addition of sialic acid to ganglioside GM1a by ST3 ${\beta}$-galactoside ${\alpha}$-2,3-sialyltransferase 2 (ST3GAL2). Above all, GD1a are known to be related with the functional regulation of several growth factor receptors, including activation and dimerization of epidermal growth factor receptor (EGFR) in tumor cells. The activity of EGF and EGFR is known to be a very important factor for meiotic and cytoplasmic maturation during in vitro maturation (IVM) of mammalian oocytes. However, the role of gangliosides GD1a for EGFR-related signaling pathways in porcine oocyte is not yet clearly understood. Here, we investigated that the effect of ST3GAL2 as synthesizing enzyme GD1a for EGFR activation and phosphorylation during meiotic maturation. To investigate the expression of ST3GAL2 according to the EGF treatment (0, 10 and 50 ng/ml), we observed the patterns of ST3GAL2 genes expression by immunofluorescence staining in denuded oocyte (DO) and cumulus cell-oocyte-complex (COC) during IVM process (22 and 44 h), respectively. Expression levels of ST3GAL2 significantly decreased (p<0.01) in an EGF concentration (10 and 50 ng/ml) dependent manner. And fluorescence expression of ST3GAL2 increased (p<0.01) in the matured COCs for 44 h. Under high EGF concentration (50 ng/ml), ST3GAL2 protein levels was decreased (p<0.01), and their shown opposite expression pattern of phosphorylation-EGFR in COCs of 44 h. Phosphorylation of EGFR significantly increased (p<0.01) in matured COCs treated with GD1a for 44 h. In addition, ST3GAL2 protein levels significantly decreased (p<0.01) in GD1a ($10{\mu}M$) treated COCs without reference to EGF pre-treatment. These results suggest that treatment of exogenous ganglioside GD1a may play an important role such as EGF in EGFR-related activation and phosphorylation in porcine oocyte maturation of in vitro.

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참고문헌

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