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Treatment with Ca2+ ionophore improves embryo development and outcome in cases with previous developmental problems:
1Department of Gynecological Endocrinology and Kinderwunsch Zentrum, Landes-Frauen-und Kinderklinik, Krankenhausstr. 26-30, A-4020 Linz, Austria Faculty of Medicine, Johannes Kepler University, 4020 Linz, Austria thomas.ebner@gespag.at.
Human Reproduction (Oxford, England)
|November 8, 2014
Summary
Calcium ionophore (A23187) treatment significantly improved embryo development and live birth rates in patients with a history of embryo developmental problems. This intervention helps overcome cleavage arrest and enhances clinical outcomes.
Area of Science:
- Reproductive Medicine and Embryology
- Cell Biology and Developmental Biology
Background:
- Intracellular free calcium is crucial for regulating cell division events.
- Calcium oscillations are observed before cell division in human embryos.
- Arrested human embryos exhibit absent calcium oscillations, unlike in animal models where ionophores can restore mitotic division.
Purpose of the Study:
- To investigate if calcium ionophore treatment (A23187) improves embryo development and pregnancy outcomes in patients with prior embryo developmental issues.
- To assess the efficacy of A23187 in overcoming embryo developmental arrest and enhancing clinical pregnancy and live birth rates.
Main Methods:
- A prospective, multicenter, uncontrolled intervention study involving 57 patients over one year.
- Inclusion criteria focused on patients with complete embryo developmental arrest, severe delay, or reduced blastocyst formation in previous cycles.
- Metaphase II oocytes were treated with calcium ionophore (A23187) immediately after ICSI, followed by standard in vitro culture.
Main Results:
- No significant difference in fertilization rates was observed between ionophore-treated and control cycles.
- Significantly higher rates of cleavage to the 2-cell stage (98.5% vs. 91.9%) and blastocyst formation (47.6% vs. 5.5%) were achieved with ionophore treatment.
- Ionophore treatment led to significant increases in implantation (44.4% vs. 12.5%), clinical pregnancy (45.1% vs. 12.8%), and live birth rates (45.1% vs. 12.8%).
Conclusions:
- Calcium ionophore (A23187) application is effective in improving embryo development, including cleavage and blastocyst formation.
- This treatment significantly enhances clinical pregnancy and live birth rates in patients experiencing embryo developmental problems.
- Developmental incompetence of embryos is identified as a novel indication for ionophore treatment, specifically for overcoming cleavage arrest.
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