The association between follicle size and oocyte development as a function of final follicular maturation triggering

2020 ◽  
Vol 40 (6) ◽  
pp. 887-893
Author(s):  
Aya Mohr-Sasson ◽  
Raoul Orvieto ◽  
Shlomit Blumenfeld ◽  
Michal Axelrod ◽  
Danielle Mor-Hadar ◽  
...  
1981 ◽  
Vol 96 (3) ◽  
pp. 370-376 ◽  
Author(s):  
G. Freundl ◽  
R. Terinde ◽  
W. Distler ◽  
A. Baumeister ◽  
J. Herberger ◽  
...  

Abstract. Serum levels of oestradiol-17β (Oe2), luteinizing hormone (LH) and progesterone (P) in 20 healthy women were correlated to the size of the ripening follicle during the follicular phase of normal menstrual cycles. Growing follicles were measured by ultrasound using the full bladder technique. In each individual case a good correlation (r = 0.88) between the Oe2 values and the size of the maturing follicle was found. However, since all women examined ovulated at a different Graafian follicle diameter (range 17 to 26 mm), the corresponding Oe2 values showed quite a large variation (range 0.78 to 2.5 nmol/l). The cervical score correlated to follicular maturation up to a follicle size of 19 mm (maximal cervical reaction). From then on no further improvement of the cervical parameters could be observed. We conclude that ultrasound monitoring of follicular growth can be a useful addition to the Oe2 and P measurements in the clinical management of the infertile woman. Bifollicular maturation can be diagnosed early, when the endocrinological data are combined with follicle size. Moreover, a correlation can be made between follicular growth and oestradiol production in the individual cycle.


Author(s):  
Valerie V. Ernst

During the earliest stage of oocyte development in the limpet, Acmea scutum, Golgi complexes are small, few and randomly dispersed in the cytoplasm. As growth proceeds, the Golgi complexes increase in size and number and migrate to the periphery of the cell. At this time, fibrous structures resembling striated rootlets occur associated with the Golgi complexes. Only one fibrous structure appears to be associated with a Golgi complex.The fibers are periodically cross banded with an average of 4 dense fibrils and 6 lighter fibrils per period (Fig. 1). The cross fibrils have a center to center spacing of about 7 run which appears to be the same as that of the striated rootlets of the gill cilia in this animal.


1987 ◽  
Vol 116 (3_Suppl) ◽  
pp. S117-S118
Author(s):  
H. JARRY ◽  
B. MEYER ◽  
G. HOLZAPFEL ◽  
B. HINNEY ◽  
D. TEMME ◽  
...  

2011 ◽  
Vol 19 (6) ◽  
pp. 1025-1034 ◽  
Author(s):  
Ali Karami ◽  
Annie Christianus ◽  
Hadi Zokaeifar ◽  
Khairul Zamri Saad ◽  
Fahmi T. J. Imraan ◽  
...  

2021 ◽  
Vol 10 (13) ◽  
pp. 2757
Author(s):  
Xia Hao ◽  
Amandine Anastácio ◽  
Kenny A. Rodriguez-Wallberg

Fertility preservation through ovarian stimulation, aiming at cryopreserving mature oocytes or embryos, is sometimes unsuccessful. This clinical situation deserves novel approaches to overcome infertility following cancer treatment in patients facing highly gonadotoxic treatment. In this controlled experimental study, we investigated the feasibility of in-vitro culturing secondary follicles isolated from superovulated ovaries of mice recently treated with gonadotropins. The follicle yields of superovulated ovaries were 45.9% less than in unstimulated controls. Follicles from superovulated ovaries showed faster growth pace during the initial 7 days of culture and secreted more 17β-estradiol by the end of culture vs controls. Parameters reflecting the outcome of follicular development and oocyte maturation competence in vitro were similar between superovulated and control groups, with a similar follicle size at the end of culture and around 70% survival. Nearly half of cultured follicles met the criteria for in-vitro maturation in both groups and approximately 60% of those achieved a mature MII oocyte, similarly in both groups. Over 60% of obtained MII oocytes displayed normal-looking spindle and chromosome configurations, without significant differences between the groups. Using a validated follicle culture system, we demonstrated the feasibility of secondary follicle isolation, in-vitro culture and oocyte maturation with normal spindle and chromosome configurations obtained from superovulated mice ovaries.


Cells ◽  
2020 ◽  
Vol 9 (2) ◽  
pp. 274
Author(s):  
Matthew Antel ◽  
Mayu Inaba

The Drosophila ovary offers a suitable model system to study the mechanisms that orchestrate diverse cellular processes. Oogenesis starts from asymmetric stem cell division, proper differentiation and the production of fully patterned oocytes equipped with all the maternal information required for embryogenesis. Spatial and temporal regulation of cell-cell interaction is particularly important to fulfill accurate biological outcomes at each step of oocyte development. Progress has been made in understanding diverse cell physiological regulation of signaling. Here we review the roles of specialized cellular machinery in cell-cell communication in different stages of oogenesis.


1976 ◽  
Vol 33 (4) ◽  
pp. 974-988 ◽  
Author(s):  
Bernard Jalabert

The endocrine processes which control oocyte maturation (resumption of meiosis) and ovulation have been studied in vitro in the trout Salmo gairdneri. Follicular maturation is ultimately under the control of a pituitary gonadotropin which induces the follicle to synthesize specific steroids; these steroids act in turn directly on the oocyte to promote maturation. The systematic study of the in vitro efficiency of various steroids have shown that 17α-hydroxy-20β-dihydroprogesterone plays a preferential role in initiating maturation; this steroid has a high affinity for a plasma protein system. The efficiency of this steroid, similarly to the efficiency of the gonadotropin, can be modulated by other circulating steroids. The precise chronology of some events of follicle maturation have been defined using inhibitors of protein and RNA synthesis.The ovulatory process (sensu stricto: expulsion of matured oocyte from the follicular envelopes) has been experimentally dissociated from oocyte maturation, and some mediators likely to act on ovulation have been identified.These data permit the consideration of novel means of intervention at the ovarian level to synchronize maturation and ovulation in fish, in order to give new tools for progress in aquaculture.


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