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In-vitro enhancement of mouse embryonic development by co-culture with peritoneal macrophages
R Honda1, K Matsuura, Y Fukumatsu
1Department of Obstetrics and Gynaecology, Kumamoto University School of Medicine, Japan.
Abstract:
The effects of peritoneal macrophages on mouse fertilization and embryonic development in vitro were examined by a co-culture method. In experiment 1, oocytes from F1 strain mice were inseminated and cultured with a monolayer of peritoneal macrophages to determine the effects of the macrophages on fertilization. In experiment 2, 1-cell embryos, fertilized in vivo from either a non-blocking or a blocking strain, were also incubated with peritoneal macrophages to determine whether these cells overcame the developmental arrest. Although the peritoneal macrophages had an adverse effect on fertilization in the F1 strain, embryonic development was significantly improved by the co-culture. This beneficial effect on embryonic development was also observed in the embryos fertilized in vivo from the strain that exhibited a 2-cell block. These results suggest that peritoneal macrophages provide an effective co-culture system for the in-vitro development of mouse embryos.
Insights
Peritoneal macrophages negatively impacted mouse fertilization but significantly enhanced embryonic development in vitro. This co-culture system proved beneficial for overcoming developmental arrest in mouse embryos.
Area of Science:
- Reproductive Biology
- Developmental Biology
- Immunology
Background:
- Peritoneal macrophages are immune cells with potential roles in reproductive processes.
- In vitro fertilization and embryo culture techniques are crucial for assisted reproduction and research.
- Understanding factors affecting early embryonic development is vital for improving fertility outcomes.
Purpose of the Study:
- To investigate the impact of peritoneal macrophages on mouse oocyte fertilization in vitro.
- To assess the effect of peritoneal macrophages on the in vitro development of mouse embryos, particularly those experiencing developmental arrest.
- To evaluate the potential of peritoneal macrophages as a co-culture system for improving in vitro embryo development.
Main Methods:
- Co-culture of mouse oocytes and early-stage embryos with peritoneal macrophages.
- Experiment 1: Assessed fertilization rates of F1 strain mouse oocytes co-cultured with macrophages.
- Experiment 2: Evaluated embryonic development of 1-cell embryos (from non-blocking and blocking strains) incubated with macrophages.
Main Results:
- Peritoneal macrophages exhibited an adverse effect on fertilization rates in the F1 mouse strain.
- Co-culture with peritoneal macrophages significantly improved embryonic development in vitro.
- The beneficial effect on embryonic development was observed even in embryos from a strain exhibiting a 2-cell block.
Conclusions:
- Peritoneal macrophages can negatively affect mouse fertilization but positively influence in vitro embryonic development.
- The co-culture of mouse embryos with peritoneal macrophages represents a promising system for enhancing in vitro development.
- These findings suggest a therapeutic potential for peritoneal macrophages in improving embryo culture conditions.