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He XQ, Song YQ, Liu R, Liu Y, Zhang F, Zhang Z, Shen YT, Xu L, Chen MH, Wang YL, Xu BH, Yang XJ, Wang HL. Axin-1 Regulates Meiotic Spindle Organization in Mouse Oocytes. PLoS One 2016; 11:e0157197. [PMID: 27284927 PMCID: PMC4902301 DOI: 10.1371/journal.pone.0157197] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2016] [Accepted: 05/25/2016] [Indexed: 11/23/2022] Open
Abstract
Axin-1, a negative regulator of Wnt signaling, is a versatile scaffold protein involved in centrosome separation and spindle assembly in mitosis, but its function in mammalian oogenesis remains unknown. Here we examined the localization and function of Axin-1 during meiotic maturation in mouse oocytes. Immunofluorescence analysis showed that Axin-1 was localized around the spindle. Knockdown of the Axin1 gene by microinjection of specific short interfering (si)RNA into the oocyte cytoplasm resulted in severely defective spindles, misaligned chromosomes, failure of first polar body (PB1) extrusion, and impaired pronuclear formation. However, supplementing the culture medium with the Wnt pathway activator LiCl improved spindle morphology and pronuclear formation. Downregulation of Axin1 gene expression also impaired the spindle pole localization of γ-tubulin/Nek9 and resulted in retention of the spindle assembly checkpoint protein BubR1 at kinetochores after 8.5 h of culture. Our results suggest that Axin-1 is critical for spindle organization and cell cycle progression during meiotic maturation in mouse oocytes.
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Affiliation(s)
- Xiao-Qin He
- Organ Transplantation Institute, Medical College, Xiamen University, Xiamen City, Fujian Province, P. R. China
- Department of Gynaecology and Obstetrics, Zhongshan Hospital, Xiamen University, Xiamen City, Fujian Province, P. R. China
- The Fifth Hospital of Wuhan, Wuhan City, Hubei Province, P. R. China
| | - Yue-Qiang Song
- New England Fertility Institute, Stamford, CT, United States of America
| | - Rui Liu
- Department of Gynaecology and Obstetrics, Zhongshan Hospital, Xiamen University, Xiamen City, Fujian Province, P. R. China
| | - Yu Liu
- Organ Transplantation Institute, Medical College, Xiamen University, Xiamen City, Fujian Province, P. R. China
| | - Fei Zhang
- Department of Gynaecology and Obstetrics, Zhongshan Hospital, Xiamen University, Xiamen City, Fujian Province, P. R. China
| | - Zhen Zhang
- Xiamen Institute for Food and Drug Quality Control, Xiamen City, Fujian Province, P. R. China
| | - Yu-Ting Shen
- Department of Obstetrics and Gynecology, Shanghai First Maternity and Infant Hospital, Tongji University School of Medicine, Shanghai City, P. R. China
| | - Lin Xu
- New England Fertility Institute, Stamford, CT, United States of America
| | - Ming-Huang Chen
- Department of Gynaecology and Obstetrics, Zhongshan Hospital, Xiamen University, Xiamen City, Fujian Province, P. R. China
| | - Ya-Long Wang
- Organ Transplantation Institute, Medical College, Xiamen University, Xiamen City, Fujian Province, P. R. China
| | - Bai-Hui Xu
- Organ Transplantation Institute, Medical College, Xiamen University, Xiamen City, Fujian Province, P. R. China
| | - Xiang-Jun Yang
- Department of Gynaecology and Obstetrics, Zhongshan Hospital, Xiamen University, Xiamen City, Fujian Province, P. R. China
- * E-mail: (HLW); (XJY)
| | - Hai-Long Wang
- Organ Transplantation Institute, Medical College, Xiamen University, Xiamen City, Fujian Province, P. R. China
- * E-mail: (HLW); (XJY)
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