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[The meiosis arrest of mouse oocytes induced by adenine]
Abstract:
The effect of purine on the meiosis of mouse oocytes was studied. When adenine and benzyladenine, a similar substance of adenine, was microinjected into the germinal vesicle of oocytes, the meiotic maturation of oocytes could be obviously arrested depending on the dosage of injection. The stimulator of adenylate cyclase, NaF, could enhance the arrest effect of adenine. It indicated that cAMP played a important role in mouse oocytes meiotic resumption. Hypoxanthine and adenine had different effects in different medium. Hypoxanthine could obviously arrest the maturation of mouse cumulus oocyte complex (COC) and cumulus denuded oocytes (DO) in DMEM or EMEM. But only in DMEM adenine could obviously arrest the maturation of COC, and had co-effect with hypoxanthine in DMEM. They could almost arrest the maturation of COC and DO. Adenine in EMEM had little arrest effect on maturation of COC and DO. The different effects may result from the different adenine absorption by oocyte in DMEM and EMEM. Adding glutamine into EMEM could enhance the arrest effect of adenine to COC and DO.
Insights
Purines like adenine can arrest mouse oocyte meiosis. Cyclic adenosine monophosphate (cAMP) is crucial for meiotic resumption, with medium composition affecting purine efficacy.
Area of Science:
- Reproductive Biology
- Cell Biology
- Molecular Biology
Context:
- Meiotic maturation in mammalian oocytes is a complex process regulated by intracellular signaling pathways.
- Understanding the role of purines and their metabolites is essential for comprehending oocyte development and potential interventions.
Purpose:
- To investigate the impact of purine compounds, specifically adenine and hypoxanthine, on the meiotic maturation of mouse oocytes.
- To elucidate the role of cyclic adenosine monophosphate (cAMP) in regulating oocyte meiotic resumption.
Summary:
- Microinjection of adenine and benzyladenine into mouse oocytes arrested meiotic maturation in a dose-dependent manner.
- Sodium fluoride (NaF), an adenylate cyclase stimulator, enhanced adenine's inhibitory effect, suggesting cAMP's involvement.
- Hypoxanthine arrested maturation in both cumulus oocyte complexes (COCs) and denuded oocytes (DOs) across DMEM and EMEM media.
- Adenine's inhibitory effect was observed primarily in DMEM, with a synergistic effect when combined with hypoxanthine.
- Adenine showed minimal effect in EMEM, but this was enhanced by glutamine, indicating medium-specific absorption differences.
Impact:
- This study highlights the critical role of cAMP in regulating mouse oocyte meiotic resumption.
- Findings suggest that purine availability and metabolism significantly influence oocyte meiotic progression.
- The differential effects of purines based on medium composition provide insights into factors affecting oocyte quality and developmental potential.