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[The action of acetylcholine antagonists on preimplantation mouse embryos cultured in vitro]
Abstract:
The effects of acetylcholine antagonists on development of the two-cell mouse embryos was studied. Etpenal-3 and etpenal-14 were shown to delay cleavage, affect cytokinesis, induce fusion of the blastomeres and arrest development at the stage of two-eight blastomeres with respect to the concentration used. Atropine, an M-cholinolytic, affects the early embryogenesis at a higher concentration than the cholinolytics with mixed effect. Acetylcholine does not prevent cleavage and compactization of the embryos and exerts a protective effect against the cholinolytics with mixed effect at the early developmental stages. The effect of atropine is weaker. The data obtained suggest the presence of structures sensitive to cholinolytics in the early mouse embryos and a possible involvement of acetylcholine in the early development of mammals.
Insights
Acetylcholine antagonists disrupt early mouse embryo development, delaying cleavage and affecting cell division. Acetylcholine itself appears to protect embryos from these negative effects.
Area of Science:
- Developmental Biology
- Embryology
- Pharmacology
Context:
- Early mammalian development is crucial for reproductive success.
- Understanding the molecular mechanisms governing preimplantation embryogenesis is essential.
- The role of neurotransmitters in embryonic development is an emerging area of research.
Purpose:
- To investigate the impact of acetylcholine antagonists on the early development of two-cell mouse embryos.
- To determine the effects of specific cholinolytics (etpenal-3, etpenal-14, atropine) on embryonic cleavage, cytokinesis, and blastomere fusion.
- To assess the potential protective role of acetylcholine against these antagonists.
Summary:
- Acetylcholine antagonists (etpenal-3, etpenal-14) were found to delay cleavage, impair cytokinesis, induce blastomere fusion, and arrest development in a dose-dependent manner.
- Atropine, an M-cholinolytic, affected embryogenesis at higher concentrations compared to other cholinolytics.
- Acetylcholine did not inhibit cleavage or compactization and demonstrated a protective effect against cholinolytics, though atropine's effect was less pronounced.
- These findings suggest the presence of cholinolytic-sensitive structures in early mouse embryos and implicate acetylcholine in mammalian early development.
Impact:
- Provides evidence for the involvement of cholinergic systems in mammalian embryogenesis.
- Highlights potential targets for modulating early embryonic development.
- Contributes to a deeper understanding of the interplay between neurotransmitters and developmental processes.