Enhancement of mouse egg activation by the kinase inhibitor, 6-dimethylaminopurine (6-DMAP)
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Updated: Oct 8, 2026
Mouse Oocyte Microinjection, Maturation and Ploidy Assessment
Published on: July 23, 2011
Abstract:
Metaphase arrest in vertebrate eggs is maintained by the action of cytostatic factor (CSF) on maturation promoting factor (MPF). In amphibian eggs, the kinase inhibitor, 6-dimethylaminopurine (6-DMAP) inactivates both CSF and MPF, resulting in the release from metaphase and entry into interphase. In the mouse, 6-DMAP induces nuclear formation in maturing oocytes, but not in eggs at metaphase II. We found that 6-DMAP accelerated the transition to interphase in mouse eggs treated with the parthenogenetic agents A23187, cycloheximide, or phorbol 12-myristate 13-acetate (PMA). Newly ovulated eggs, refractory to full activation by A23187, entered interphase when treated with A23187 and 6-DMAP in combination. Occasional batches of eggs formed nuclei in response to 6-DMAP alone. These results are discussed with regard to the possible effects of 6-DMAP on MPF and CSF.
Insights
The kinase inhibitor 6-dimethylaminopurine (6-DMAP) promotes cell cycle progression in mouse eggs. It accelerates the transition to interphase, particularly when combined with parthenogenetic agents.
Area of Science:
- * Developmental Biology
- * Cell Cycle Regulation
Background:
- * Vertebrate egg metaphase arrest is regulated by cytostatic factor (CSF) and maturation promoting factor (MPF).
- * 6-dimethylaminopurine (6-DMAP), a kinase inhibitor, releases amphibian eggs from metaphase arrest by inactivating CSF and MPF.
Purpose of the Study:
- * To investigate the effect of 6-DMAP on metaphase II arrest in mouse eggs.
- * To determine if 6-DMAP can induce or accelerate the transition to interphase in mouse oocytes and eggs.
Main Methods:
- * Treatment of mouse oocytes and eggs with 6-DMAP alone and in combination with parthenogenetic agents (A23187, cycloheximide, PMA).
- * Observation of nuclear formation and transition to interphase.
Main Results:
- * 6-DMAP induced nuclear formation in maturing mouse oocytes but not in metaphase II eggs.
- * 6-DMAP accelerated the transition to interphase in mouse eggs treated with parthenogenetic agents.
- * Combination treatment of A23187 and 6-DMAP enabled refractory newly ovulated eggs to enter interphase.
Conclusions:
- * 6-DMAP can facilitate the release from metaphase arrest in mouse eggs, suggesting an effect on MPF or CSF pathways.
- * The findings highlight 6-DMAP's potential role in regulating egg activation and cell cycle progression.
