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Updated: Jan 19, 2026
Author Spotlight: Elucidating the Dynamics of Mechano-Transduction and Nuclear Agitation in Mouse Oocytes
Published on: January 12, 2024
Involvement of CaMKII in regulating the release of diplotene-arrested mouse oocytes by pAkt1 (Ser473)
Lingling Liu1,2,3, Hanwen Li4, Ben Labbe5
1Central Laboratory of the Fourth Affiliated Hospital, CMU , Shenyang , PR China.
Abstract:
Calcium (Ca2+)/calmodulin-dependent protein kinase II (CaMKII) had been reported to play a role in the process of fertilization. However, the role of CaMKII in the release of diplotene-arrested oocytes is poorly understood. In this study, we explored the potential effect of CaMKII on Akt1 and the relationship among CaMKII, Akt1 and phosphatidylinositol (3,4,5)-trisphosphate (PIP3) during the meiotic resumption of mouse oocytes. We found that inhibition of CaMKII aggravated diplotene arrest. We detected the expression and distribution of pCaMKII (Thr286), pAkt1 (Ser473), Cdc25B and pCdc2 (Tyr15) when oocytes were treated with KN-93, SH-6, LY294002 or PIP3, respectively. Our data showed that down-regulated CaMKII by KN-93 decreased the levels of pAkt1 (Ser473) and rearranged the distribution of pAkt1 (Ser473). Meanwhile, down-regulated pAkt1 (Ser473) by SH-6 also decreased the levels of pCaMKII (Thr286), Cdc25B and pCdc2 (Tyr15) significantly and rearranged the distributions of pCaMKII (Thr286). Furthermore, our data showed that exogenous PIP3 up-regulated GVBD rates significantly and increased the levels of pCaMKII (Thr286) and pAkt1 (Ser473). On the contrary, down-regulation of PIP3 by LY294002 decreased GVBD rates and the levels of pCaMKII (Thr286) and pAkt1 (Ser473), respectively. Our results showed that Akt1 and CaMKII regulated each other, and PIP3 may be involved in these regulations during the release of mouse oocytes from diplotene arrest.
Insights
Calcium (Ca2+)/calmodulin-dependent protein kinase II (CaMKII) and Akt1 signaling pathways, regulated by phosphatidylinositol (3,4,5)-trisphosphate (PIP3), are crucial for releasing mouse oocytes from diplotene arrest, revealing a novel regulatory mechanism.
Area of Science:
- Reproductive Biology
- Molecular Cell Biology
- Signal Transduction
Background:
- Calcium (Ca2+)/calmodulin-dependent protein kinase II (CaMKII) is implicated in fertilization.
- The specific role of CaMKII in releasing diplotene-arrested oocytes remains unclear.
Purpose of the Study:
- To investigate the effect of CaMKII on Akt1.
- To elucidate the relationship among CaMKII, Akt1, and phosphatidylinositol (3,4,5)-trisphosphate (PIP3) in mouse oocyte meiotic resumption.
Main Methods:
- Inhibition of CaMKII using KN-93 and Akt1 using SH-6.
- Treatment with LY294002 to down-regulate PIP3 or exogenous PIP3.
- Detection of pCaMKII (Thr286), pAkt1 (Ser473), Cdc25B, and pCdc2 (Tyr15) expression and distribution.
Main Results:
- CaMKII inhibition worsened diplotene arrest and decreased pAkt1 levels.
- Akt1 inhibition reduced pCaMKII, Cdc25B, and pCdc2 levels.
- PIP3 modulated CaMKII and Akt1 phosphorylation and was essential for meiotic resumption.
Conclusions:
- Akt1 and CaMKII mutually regulate each other during mouse oocyte meiotic resumption.
- PIP3 plays a significant role in mediating these regulatory interactions for oocyte release from diplotene arrest.
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