Signaling pathways in ascidian oocyte maturation: Effects of various inhibitors and activators on germinal vesicle breakdown
نویسندگان
چکیده
منابع مشابه
Germinal vesicle breakdown in the mouse oocyte.
Germinal vesicle breakdown in mouse oocytes in vivo and in vitro has been examined by electron microscopy. In vitro oocytes were studied immediately after release from follicles and at various times (05-11 h) in culture. Approximately 30 min after oocyte release, chromatin condensation begins along the convoluted nuclear envelope (NE). Chromatin granules are common in all condensing chromosomes...
متن کاملCombined effects of calcium and dibutyryl cyclic AMP on germinal vesicle breakdown in the mouse oocyte.
Mouse oocytes were cultured in the presence of dibutyryl cyclic AMP (dbcAMP) and various agents that affect cytoplasmic calcium concentrations. Treatment that inhibited calcium uptake potentiated the inhibitory effect of dbcAMP and treatments which stimulated cellular calcium uptake overcame the effect of dbcAMP. Elevated extracellular calcium (greater than 10 mM) significantly decreased the in...
متن کاملOocyte Maturation in the Brachiopod Terebratalia transversa: Role of Follicle Cell-Oocyte Attachments During Ovulation and Germinal Vesicle Breakdown.
In the brachiopod Terebratalia transversa, each ovarian follicle consists of (i) a prophase-arrested oocyte with an enlarged nucleus (= the germinal vesicle, or GV), and (ii) a surrounding sheath of follicle cells that attach to the oocyte by means of junctional complexes. Within about 80 min after removing a follicle from the ovary, the follicular sheath undergoes a microfilament-mediated retr...
متن کاملEccentric position of the germinal vesicle and cortical flow during oocyte maturation specify the animal-vegetal axis of ascidian embryos.
The animal-vegetal (A-V) axis is already set in unfertilized eggs. It plays crucial roles in coordinating germ-layer formation. However, how the A-V axis is set has not been well studied. In ascidians, unfertilized eggs are already polarized along the axis in terms of cellular components. This polarization occurs during oocyte maturation. Oocytes within the gonad have the germinal vesicle (GV) ...
متن کاملEffect of Treatment to Temporarily Block Germinal Vesicle Breakdown on Porcine Oocyte Maturation and Subsequent Parthenogenetic Development
In order to achieve developmental competence, porcine oocytes must undergo both nuclear and cytoplasmic maturation. Nuclear maturation results from breakdown of the germinal vesicle (GV) and progression of meiosis to metaphase II (MII). Cytoplasmic maturation is the accumulation, within the oocyte’s cytoplasm, of products necessary for fertilization, cleavage and development, prior to activatio...
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ژورنال
عنوان ژورنال: Development, Growth and Differentiation
سال: 2005
ISSN: 0012-1592,1440-169X
DOI: 10.1111/j.1440-169x.2005.00796.x