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Effect of Intracellular Ca2+ Chelation with the Acetoxymethyl Ester-Derived Form of Bis(o-Aminophenoxy)Ethane-N,N,N,N′,N′-Tetraacetic Acid on Meiotic Division and Chromosomal Segregation in Mouse Oocytes

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Abstract

Purpose: Our purpose was to ascertain the effect of intracellular Ca 2+ chelation on the chromosomal distribution and segregation of mouse oocytes during maturation in vitro.

Methods: Germinal vesicle oocytes were loaded with the acetoxymethyl ester-derived form of bis(o-aminophenoxy)-ethane-N,N,N′,N′-tetraacetic acid (BAPTA-AM). Chromosomal distribution and segregation of control and BAPTA-AM-treated metaphase II (MII) oocytes were evaluated at 16 hr, and intracellular ATP content at 0, 1, and 16 hr after BAPTA-AM loading.

Results: BAPTA-AM treatment decreased (P ≤ 0.05) the potential for in vitro maturation, increased (P ≤ 0.0001) the percentage of oocytes displaying an abnormal distribution of metaphase II chromosomes in the meiosis II spindle and aneuploidy, and decreased (P ≤ 0.005) the ATP content at 0, 1, and 16 hr of culture compared to the control groups.

Conclusions: These findings raise some concern about any other condition/drug that may directly or indirectly decrease the intracellular Ca 2+ concentration in human oocytes.

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Authors and Affiliations

  1. Department of Paediatrics, Obstetrics and Gynaecology, Faculty of Medicine, University of Valencia, Valencia, Spain

    Francisco J. Vendrell, Jorge Ten, Maria N. M. De Oliveira & Antonio Cano

  2. Department of Molecular, Cellular and Developmental Biology, University of Colorado at Boulder, Boulder, Colorado

    Juan J. Tarin

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  1. Francisco J. Vendrell
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  3. Maria N. M. De Oliveira
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Vendrell, F.J., Ten, J., De Oliveira, M.N.M. et al. Effect of Intracellular Ca2+ Chelation with the Acetoxymethyl Ester-Derived Form of Bis(o-Aminophenoxy)Ethane-N,N,N,N′,N′-Tetraacetic Acid on Meiotic Division and Chromosomal Segregation in Mouse Oocytes. J Assist Reprod Genet 16, 276–282 (1999). https://doi.org/10.1023/A:1020323730908

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