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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Rolfo, A. Garcia, J. Todros, T. Post, M. Caniggia, I. |
| Description | Country affiliation: Canada Author Affiliation: Rolfo A ( Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada.) |
| Abstract | The E3 ubiquitin ligase MULE (Mcl-1 Ubiquitin Ligases E3) targets myeloid cell leukemia factor 1 (Mcl-1) and tumor suppressor p53 for proteasomal degradation. Although Mcl-1 and p53 have been implicated in trophoblast cell death in preeclampsia (PE) and intrauterine growth restriction (IUGR), the mechanisms regulating their expression in the human placenta remains elusive. Herein, we investigated MULE's involvement in regulating Mcl-1 and p53 degradation during normal and abnormal (PE, IUGR) placental development. MULE expression peaked at 5-7 weeks of gestation, when oxygen tension is low and inversely correlated with that of Mcl-1 and p53. MULE efficiently bound to Mcl-1 and p53 and regulated their ubiquitination during placental development. Exposure of first trimester villous explants to 3% O(2) resulted in elevated MULE expression compared with 20% O(2). Low-oxygen-induced MULE expression in JEG3 choriocarcinoma cells was abolished by hypoxia-inducible factor (HIF)-1 siRNA. MULE was overexpressed in both PE and IUGR placentae. In PE, MULE preferentially targeted p53 for degradation, allowing accumulation of pro-apoptotic Mcl-1 isoforms. In IUGR, however, MULE targeted pro-survival Mcl-1, allowing p53 to accumulate and exert its apoptotic function. These data demonstrate that oxygen regulates Mcl-1 and p53 stability during placentation via HIF-1-controlled MULE expression. The different preferential targets of MULE in PE and IUGR placentae classify early-onset PE and IUGR as distinct molecular pathologies. |
| File Format | HTM / HTML |
| e-ISSN | 20414889 |
| DOI | 10.1038/cddis.2012.44 |
| Journal | Cell Death and Disease |
| Volume Number | 3 |
| Language | English |
| Publisher | Nature Publishing Group |
| Publisher Date | 2012-05-03 |
| Publisher Place | Great Britain (UK) |
| Access Restriction | Open |
| Subject Keyword | Research Support, Non-u.s. Gov't Antagonists & Inhibitors Ubiquitination Hek293 Cells Tumor Suppressor Protein P53 Genetics Oxygen Hypoxia-inducible Factor 1, Alpha Subunit Placentation Rna, Small Interfering Fetal Growth Retardation Pre-eclampsia Metabolism Gestational Age Rna Interference Pregnancy Discipline Cell Biology Pathology Placenta Myeloid Cell Leukemia Sequence 1 Protein Cell Line, Tumor Proto-oncogene Proteins C-bcl-2 Ubiquitin-protein Ligases |
| Content Type | Text |
| Resource Type | Article |
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