| First Author | Yang YR | Year | 2015 |
| Journal | Placenta | Volume | 36 |
| Issue | 10 | Pages | 1063-8 |
| PubMed ID | 26286378 | Mgi Jnum | J:325172 |
| Mgi Id | MGI:6862880 | Doi | 10.1016/j.placenta.2015.08.001 |
| Citation | Yang YR, et al. (2015) O-GlcNAc cycling enzymes control vascular development of the placenta by modulating the levels of HIF-1alpha. Placenta 36(10):1063-8 |
| abstractText | INTRODUCTION: Placental vasculogenesis is essential for fetal growth and development, and is affected profoundly by oxygen tension (hypoxia). Hypoxia-inducible factor-1alpha (HIF-1alpha), which is stabilized at the protein level in response to hypoxia, is essential for vascular morphogenesis in the placenta. Many studies suggested that responses to hypoxia is influenced by O-GlcNAcylation. O-GlcNAcylation is regulated by O-GlcNAc transferase (OGT) and O-GlcNAcase (OGA) that catalyze the addition and removal of O-GlcNAc respectively. METHODS: We generated OGA deficient mice and evaluated OGA(-/-) placentas. The analysis of OGA(-/-) placentas was focused on morphological change and placental vasculogenesis. HIF-1alpha protein stability or transcriptional activity under dysregulation of O-GlcNAcylation were evaluated by Western blot, RT-qPCR and luciferase reporter gene assays in MEFs or MS1 cell line. RESULTS: Deletion of OGA results in defective placental vasculogenesis. OGA(-/-) placentas showed an abnormal placental shape and reduced vasculature in the labyrinth, which caused a developmental delay in the embryos. OGA deletion, which elevates O-GlcNAcylation and downregulates O-GlcNAc transferase (OGT), suppressed HIF-1alpha stabilization and the transcription of its target genes. In contrast, the overexpression of O-GlcNAc cycling enzymes enhanced the expression and transcriptional activity of HIF-1alpha. DISCUSSION: These results suggest that OGA plays a critical role in placental vasculogenesis by modulating HIF-1alpha stabilization. Control of O-GlcNAcylation is essential for placental development. |
