Progesterone Maturation
Progesterone Maturation - Related Videos
09:22
Manipulation and In Vitro Maturation of Xenopus laevis Oocytes, Followed by Intracytoplasmic Sperm Injection, to Study Embryonic Development
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Cited by 13 •
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We describe methods of manipulating Xenopus laevis immature oocytes, in vitro maturation of oocytes to eggs, and intracytoplasmic sperm injection. This protocol allows degradation of some maternal proteins and overexpression of genes of interest at fertilization, and hence is valuable to study roles of specific factors in early embryonic development.
01:28
Maturation of Endosomes
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2023
The early endosome containing internalized molecules matures through transformations in its location, morphology, intraluminal pH, and membrane protein composition. Together, these changes result in a more acidic late endosome that contains multiple intraluminal vesicles; therefore, the late endosome is also called a multivesicular body (MVB). Changes in location The maturing endosome moves along microtubules from the periphery of the cell towards the perinuclear region. This movement of the...
08:12
In Vitro Differentiation of Mature Myofibers for Live Imaging
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Cited by 38 •
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Muscle cells are among the most complex eukaryotic cells. We present a protocol for the in vitro differentiation of highly mature myofibers that allows for genetic manipulation and clear imaging during all developmental stages.
07:03
Mouse Oocyte Microinjection, Maturation and Ploidy Assessment
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Cited by 75 •
2011
Oocytes are prone to aneuploidy due to errors in chromosome segregation during meiotic maturation. Aneuploid eggs can cause infertility, miscarriages or developmental disorders like Down syndrome. Here, we describe methods to introduce materials of choice into oocytes and methods to study meiotic maturation and assess ploidy.
01:26
Bacterial Protein Maturation
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2025
Bacterial protein maturation is a tightly regulated process that ensures newly synthesized polypeptides achieve correct functional conformations. This maturation involves a series of modifications, folding events, and quality control steps, often assisted by specialized chaperone proteins.N-Terminal ModificationsThe maturation of bacterial polypeptides begins cotranslationally as the polypeptide exits the ribosome. The first amino acid, N-formylmethionine (fMet), is typically modified at the...
FAQs
Progesterone acts through receptors associated with the oocyte membrane, allowing the hormone signal to begin without relying only on a slow transcriptional response. This signaling reduces intracellular cyclic AMP, a messenger that helps maintain the immature state. The resulting change connects an extracellular endocrine cue to the cell-cycle machinery that drives meiotic progression.
Lowering intracellular cyclic AMP is a key regulatory transition because it helps release the oocyte from conditions associated with immaturity. This decrease supports activation of maturation-promoting factor, linking progesterone signaling to cell-cycle control. In experimental systems, the cyclic AMP response therefore provides a mechanistic point for understanding how hormone exposure leads to germinal vesicle breakdown.
Maturation-promoting factor, composed of cyclin B and Cdk1, functions as the central cell-cycle effector downstream of progesterone signaling. Once activated after the cyclic AMP decrease, it promotes germinal vesicle breakdown and continued meiotic progression. Its involvement explains how a membrane-initiated hormone signal is translated into major structural and developmental changes inside the oocyte.
Progesterone-induced maturation occurs in responsive oocytes, indicating that hormone availability alone does not determine the result. The oocyte must be capable of receiving the membrane-associated signal and engaging the downstream cyclic AMP and maturation-promoting factor pathway. This distinction helps researchers separate failures in hormonal signaling from differences in the developmental state or physiological competence of the oocyte.
Experimental models expose responsive oocytes to progesterone and examine the resulting progression through maturation-related events, including germinal vesicle breakdown and meiotic advancement. These systems allow investigators to connect hormone signaling with cell-cycle behavior and developmental competence. They provide a controlled framework for studying oocyte physiology and for analyzing how endocrine cues influence egg formation.
Progesterone maturation models support research on oocyte physiology, fertilization, reproductive disorders, and assisted reproductive technologies. They are especially useful for examining how hormonal signals regulate developmental competence and meiotic transitions. Because the pathway links receptor signaling, cyclic AMP regulation, and cyclin B-Cdk1 activation, it also offers broader biological insight into hormone-mediated control of cellular development.