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• W2127539124 endingPage "653" @default.
• W2127539124 startingPage "647" @default.
• W2127539124 abstract "The present study showed that treatment with a cell membrane-impermeable metal ion chelator, EDTA, of porcine oocytes at the germinal vesicle (GV) stage collected from follicles 2-6 mm in diameter induced artificial activation followed by formation of a pronucleus (PN). When the oocytes were cultured for 48 h in medium containing 0.1 to 2 mM EDTA disodium salt (Na-EDTA), they were activated to form PN, and the maximum PN formation rate (63%, n = 68) was achieved in oocytes cultured with 1 mM Na-EDTA. More than 90% of oocytes activated by 1 mM Na-EDTA treatment formed 1 PN without emission of the first and the second polar bodies (PB). This result suggests that EDTA at 1 mM may force the maturing (meiosis I) oocytes to form a PN without chromosome segregation. When oocytes at the GV stage that had been cultured with 1 mM Na-EDTA for 48 h were further cultured in 0.4% BSA-containing NCSU23 medium for 144 h, blastocysts that appeared to be morphologically normal were formed at the rate of 10%, whereas no blastocysts were formed from oocytes that had not been cultured with Na-EDTA. Next we examined the effects of Ca2+, Zn2+, Fe3+, or Cu2+-saturated EDTA (Ca-EDTA, Zn-EDTA, Fe-EDTA, and Cu-EDTA, respectively), and a Ca2+-specific chelator, EGTA, at a concentration of 1 mM. The Ca-EDTA, Fe-EDTA, and Cu-EDTA, but not Zn-EDTA or EGTA, had the ability to activate the oocytes. From these results, it is suggested that extracellular chelation of Zn2+ with EDTA of maturing (meiosis I) porcine oocytes results in parthenogenetic activation of the oocytes, which induces PN formation followed by development to blastocysts." @default.
• W2127539124 created "2016-06-24" @default.
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• W2127539124 date "2001-02-01" @default.
• W2127539124 modified "2023-10-17" @default.
• W2127539124 title "Ethylenediamine-N,N,N′,N′-Tetraacetic Acid Induces Parthenogenetic Activation of Porcine Oocytes at the Germinal Vesicle Stage, Leading to Formation of Blastocysts1" @default.
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• W2127539124 doi "https://doi.org/10.1095/biolreprod64.2.647" @default.
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