Regulatory roles of ubiquitin-proteasome pathway in pig oocyte meiotic maturation and fertilization
| Autor: | Q.Y Sun, T Nagai, D Fuchimoto |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
Proteasome Endopeptidase Complex
Swine Human fertilization Food Animals Ubiquitin Multienzyme Complexes medicine Animals Homeostasis Small Animals Germinal vesicle biology urogenital system Equine Cell Cycle Cell cycle Oocyte Sperm Cell biology Cysteine Endopeptidases Meiosis medicine.anatomical_structure Proteasome Sperm chromatin decondensation Fertilization biology.protein Oocytes Animal Science and Zoology Female |
| Zdroj: | Theriogenology. 62(1-2) |
| ISSN: | 0093-691X |
| Popis: | The ubiquitin-proteasome pathway is involved in the degradation of proteins related to cell cycle progression including cyclins. The present study, using two specific proteasome inhibitors, for the first time investigated the roles of ubiquitin-proteasome in cell cycle progression during pig oocyte meiotic maturation and after fertilization. In contrast to its effect in rodent oocytes, proteasome inhibition strongly prevented germinal vesicle breakdown (GVBD). After GVBD, proteasome inhibition disrupted meiotic apparatus organization, cell cycle progression, and first polar body (PB1) extrusion. Sperm penetration into the oocytes was completely inhibited when proteasome inhibitors were added at the beginning of insemination. However, sperm chromatin decondensation and metaphase-interphase transition were not affected when inhibitors were added once sperm penetrated. The results suggest that ubiquin-proteasome complex is one of the critical regulators of meiotic cell cycle, but proteasome inhibitors do not affect major fertilization events when added after sperm penetration into the oocytes in the pig. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect