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Effect of intracellular Ca^sup 2+^ chelation with the acetoxymethyl ester-derived form of bis(o-aminophenoxy)ethaneN,N,N,N',N'-tetraacetic acid on meiotic division and chromosomal segregation in mouse oocytes

Our purpose was to ascertain the effect of intracellular Ca2+ chelation on the chromosomal distribution and segregation of mouse oocytes during maturation in vitro. Germinal vesicle oocytes were loaded with the acetoxymethyl ester-derived form of bis(o-aminophenoxy)-ethane-N,N,N',N'-tetraa...

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Bibliographic Details
Published in:Journal of assisted reproduction and genetics 1999-05, Vol.16 (5), p.276
Main Authors: Vendrell, Francisco J, Ten, Jorge, Maria N M De Oliveira, Cano, Antonio, Tarin, Juan J
Format: Article
Language:English
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Summary:Our purpose was to ascertain the effect of intracellular Ca2+ chelation on the chromosomal distribution and segregation of mouse oocytes during maturation in vitro. 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. BAPTA-AM treatment decreased (P < or = 0.05) the potential for in vitro maturation, increased (P < or = 0.0001) the percentage of oocytes displaying an abnormal distribution of metaphase II chromosomes in the meiosis II spindle and aneuploidy, and decreased (P < or = 0.005) the ATP content at 0, 1, and 16 hr of culture compared to the control groups. These findings raise some concern about any other condition/drug that may directly or indirectly decrease the intracellular Ca2+ concentration in human oocytes.
ISSN:1058-0468
1573-7330