Meiotic spindle morphogenesis in in vivo and in vitro matured mouse oocytes: insights into the relationship between nuclear and cytoplasmic quality

Human Reproduction
Alexandra SanfinsDavid F Albertini

Abstract

This work addresses the hypothesis that events occurring within the follicle soon after the LH surge are essential for coordinating morphogenesis of the spindle and cytoplasm in mouse oocytes matured in vivo (IVO); we further tested whether in vitro maturation (IVM) fails to support these events. Oocytes collected at 1, 2, 3, 4 and 5 h post-hCG or after IVM were analyzed for chromatin, nuclear lamina, microtubules (MTs) and centrosomal proteins by conventional fluorescence and confocal microscopy. In addition, these parameters were monitored in oocytes maintained in 50 microM roscovitine, followed by IVM, or in oocytes retrieved at 1.5 and 5 h post-hCG in vivo and cultured up to 16 h. A G2/M delay was observed in IVO oocytes based upon persistence of cytoplasmic MTs, nuclear lamina and centrosomes at the cortex; rapid meiotic progression in IVM oocytes was related to loss of these markers, indicating that a global activation of MPF occurred in culture. Also, maturating-promoting factor (MPF) inactivation resulted in cultured oocytes that exhibited IVO characteristics after drug removal. IVO-like characteristics were also exhibited by oocytes retrieved at 5 but not at 1.5 h after hCG treatment, even though these oocytes were sub...Continue Reading

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Citations

Dec 30, 2009·Journal of Assisted Reproduction and Genetics·Susan L Barrett, David F Albertini
Apr 6, 2006·Reproductive Biology and Endocrinology : RB&E·Hang YinRoger G Gosden
Dec 2, 2008·Reproductive Biology and Endocrinology : RB&E·Orly Lacham-Kaplan, Alan Trounson
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Nov 10, 2014·Journal of Assisted Reproduction and Genetics·Alexandra SanfinsDavid F Albertini
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May 20, 2005·Reproductive Biomedicine Online·Carlos E PlanchaDavid Albertini
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Jun 20, 2007·Theriogenology·Yi-Liang MiaoDa-Yuan Chen
Sep 3, 2011·Molecular Reproduction and Development·Heide Schatten, Qing-Yuan Sun
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Jun 6, 2009·Reproductive Biomedicine Online·Catherine M H CombellesAshok Agarwal

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