4.7 Article

Artificially Increasing Cortical Tension Improves Mouse Oocytes Development by Attenuating Meiotic Defects During Vitrification

期刊

出版社

FRONTIERS MEDIA SA
DOI: 10.3389/fcell.2022.876259

关键词

oocyte vitrificaion; cortical tension; meiosis; spindle assembly checkpoint; aneuploidy

资金

  1. National Key RESEARCH and Development Program of China [2021YFD1200402]
  2. National Natural Science Foundation of China [81901562, 31372307]
  3. Chinese Universities Scientific Fund [2021TC061]
  4. Natural Science Foundation of Hebei province [H2020206254]
  5. Special Program for Training and Guiding Outstanding Young and Middle-aged Talents [SKLSGIHP 2021A01]
  6. Key research and development projects in Hebei province [18226604D]
  7. Program of Young and Middle-aged Scientific and technological Innovation Leaders of the Xinjiang Production and Construction Corps [2018CB025]
  8. Xinghuo program of the First Hospital of Hebei Medical University [XH202005]

向作者/读者索取更多资源

Oocyte cryopreservation has significant benefits in conserving animal germplasm resources and assisting reproductive technology. However, this technique can cause damage to oocytes, leading to a decrease in oocyte quality and post-fertilization embryonic development. This study examined oocyte cortical tension and found that vitrified oocytes had decreased cortical tension. Increasing cortical tension improved oocyte polar body extrusion, embryo development, spindle positioning, KT-MT attachment, SAC activity, and reduced aneuploidy in vitrified oocytes.
Oocyte cryopreservation demonstrates great benefits in the conservation of animal germplasm resources and assisted reproductive technology. However, vitrification causes damages in oocytes, which would lead to the decrease of oocyte quality, and embryonic development post fertilization. Cytoskeleton plays an important role in regulating cell shape, organelle migration, cell division and mechanical signal transduction. Cortical tension is a reflection of the physiological state and contractile ability of cortical cytoskeleton. Appropriate cortical tension is prerequesite for normal oocyte meiosis. In the present study, oocyte cortical tension was examined by evaluating the levels of cortical tension-related protein pERM (Phospho-Ezrin/Radixin/Moesin) and pMRLC (Phospho-Myosin Light Chain 2). We found that the cortical tension of vitrified oocytes was decreased. Increasing cortical tension of vitrified oocytes by adding 10 mu g/ml ConA during in vitro culture could significantly improve the polar body extrusion rate and embryo development. Furthermore, increasing the cortical tension could improve spindle positioning, maintain kinetochore-microtubule (KT-MT) attachment, strengthen spindle assembly checkpoint (SAC) activity, and reduce the aneuploidy rate in vitrified oocytes. In conclusion, vitrification induced a remarkable decrease in cortical tension, and increasing the cortical tension could rescue the meiosis defect and improve oocyte quality.

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