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Updated: Feb 28, 2026
Multi-Photon Laser Ablation of Cytoplasmic Microtubule Organizing Centers in Mouse Oocytes
Published on: November 11, 2022
JAK2 inhibitor CEP-33779 prevents mouse oocyte maturation in vitro
Changli Wu1, Rong Li2, Haibing Luo1
1Department of Physiology, Guangdong Medical University, Zhanjiang, Guangdong, People's Republic of China.
Abstract:
The inhibitor CEP-33779 is a specific selective inhibitor of Janus kinase 2 (JAK2). In most somatic cells, JAK2 plays essential roles in cellular signal transduction and in the regulation of cell cycle. Little is known regarding the effects of JAK2 on mammalian oocyte maturation. In the present study, we investigated the effects of CEP-33779 on mouse oocytes' meiosis and the possible mechanisms of JAK2 during mouse oocyte maturation. We detected the distribution of JAK2 during the mouse oocyte maturation. The results showed that JAK2 was mainly distributed in the cytoplasm during maturation. We cultured mouse oocytes with CEP-33779, examined the maturation rate, spindle morphology, and organization of microfilaments during the mouse oocyte maturation. While the rate of germinal vesicle breakdown (GVBD) did not differ between the treated and control groups, the rate of oocyte maturation decreased significantly when treated with CEP-33779. The rate of maturation was 21.14% in treated group and was 81.44% in control group. The results show that CEP-33779 inhibits the maturation of mouse oocytes. There was no obvious difference in the meiotic spindle morphology between the treated and control groups. The results show that CEP-33779 treatment did not disrupt the reorganization of microtubules. The microfilament observation shows that the microfilament did not form actin cap and the spindle stayed at the center of the oocyte in the treated group. CEP-33779 treatment inhibited the maturation of mouse oocytes which might be because of the disruption of formation of the actin cap. These results suggest that JAK2 regulated the microfilaments aggregation during the mouse oocyte maturation.
Insights
Janus kinase 2 (JAK2) inhibition by CEP-33779 significantly impairs mouse oocyte maturation. This occurs due to disrupted microfilament organization, specifically the failure to form an actin cap, suggesting JAK2
Area of Science:
- Reproductive Biology
- Cell Signaling
- Molecular Biology
Background:
- Janus kinase 2 (JAK2) is crucial for signal transduction and cell cycle regulation in somatic cells.
- The role of JAK2 in mammalian oocyte maturation remains largely unexplored.
- Understanding JAK2's function is key to addressing potential infertility factors.
Purpose of the Study:
- To investigate the effects of the JAK2 inhibitor CEP-33779 on mouse oocyte meiosis.
- To elucidate the potential mechanisms by which JAK2 influences oocyte maturation.
- To determine JAK2's localization during mouse oocyte maturation.
Main Methods:
- Detection of JAK2 distribution within mouse oocytes during maturation.
- Culture of mouse oocytes with CEP-33779.
- Assessment of oocyte maturation rates, spindle morphology, and microfilament organization.
Main Results:
- JAK2 was primarily localized in the cytoplasm of maturing oocytes.
- CEP-33779 treatment significantly reduced the oocyte maturation rate (21.14% vs. 81.44% in controls).
- Microfilament analysis revealed a failure to form an actin cap and inhibited maturation, while microtubule organization remained unaffected.
Conclusions:
- CEP-33779 inhibits mouse oocyte maturation, likely by disrupting actin cap formation.
- JAK2 plays a regulatory role in microfilament aggregation during oocyte maturation.
- JAK2's involvement in cytoskeletal dynamics is critical for successful oocyte meiosis.
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