Oocyte Maturation in Starfish: Sequential Changes of Oocyte Shape Induced by 1-Methyladenine Associated with Germinal Vesicle Breakdown. (oocyte maturation/starfish/1-methyladenine)
نویسندگان
چکیده
منابع مشابه
Characterization of 1-methyladenine binding in starfish oocyte cortices.
1-Methyladenine (1MeAde) is the naturally occurring maturation-inducing hormone of starfish oocytes. We have prepared a biologically active [3H]1MeAde of high purity and relatively high specific radioactivity. This ligand binds to cortices isolated from full-grown prophase-arrested oocytes of the starfish Asterina pectinifera. The binding of [3H]1MeAde to cortices was rapid and reached equilibr...
متن کاملGerminal 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 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 کاملStereospecific induction of starfish oocyte maturation by (8R)-hydroxyeicosatetraenoic acid.
Oocyte maturation (meiosis reinitiation) in starfish is induced by the natural hormone 1-methyladenine. This induction of meiotic divisions can be triggered also by four fatty acids: 5,8,11-20:3; 5,8,11,14-20:4 (arachidonic acid); 6,9,12,15-20:4; 5,8,11,14,17-20:5, all other fatty acids being completely inactive. This maturation triggered by eicosanoids occurs in the micromolar range and is fac...
متن کاملSpecific inhibition of mouse oocyte nuclear protein phosphatase-1 stimulates germinal vesicle breakdown.
Okadaic acid (OA)-induced germinal vesicle breakdown (GVBD) and localization of protein phosphatase-1 (PP1) in oocyte nuclei are suggestive of PP1's role in regulating oocyte GVBD. To explore this possibility, we microinjected protein phosphatase (PP) inhibitors OA, anti-PP1 antibody (anti-PP1), PP1 inhibitor I2, and anti-PP2A antibody (anti-PP2A) into nuclei of roscovitine (ROSC)-arrested mous...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Development, Growth and Differentiation
سال: 1982
ISSN: 0012-1592,1440-169X
DOI: 10.1111/j.1440-169x.1982.00521.x