Pronuclear development was used to measure the effects on ovine oocytes of altering follicular steroidogenesis during maturation in vitro. Follicular steroid secretion was altered using enzyme inhibitors and exogenous steroid supplementation. Abnormalities induced during maturation were measured 24 h after tranfer of oocytes to the oviducts of inseminated hosts. The presence throughout maturati...

background: the following study was carried out to determine the ultrastructural features of the oocyte of the ovulatory-sized follicles in relation to concentrations of steroids and igf-i in the follicular fluid and serum in the dromedary camel. methods: camel follicles with a clear and healthy appearance were categorized into three classes: follicles 10 to 13.9, 14-17.9 and 18-30 mm diameter....

Background: In vitro maturation (IVM) of immature oocyte is a promising treatment option for infertile women.IVM procedures attempt to mimic the natural conditions of the follicular environment. The technique of IVM of oocytes has been successful after the first trial using culture of human oocytes in follicular fluid. The crucial part of this technique is the maturation process itself, and the...

a study was conducted to investigate the effect of follicular size (small,

Acquisition of the luteinizing hormone receptor (LHR) on granulosa cells of the dominant follicle is essential to physiological LH-mediated effects on the final stages of follicular growth, final maturation of the oocyte, ovulation and luteinization of the follicular wall. Therefore, LHR plays a key role in the final maturation of the dominant follicle from follicular dominance to ovulation. In...

B lymphocyte development occurs in the bone marrow, while final differentiation and maturation can occur in both the bone marrow and the spleen. Here we provide evidence that signal regulatory protein α (SIRPα), an Ig-superfamily ITIM-receptor expressed by myeloid but not by lymphoid cells, is involved in regulating B cell maturation. Lack of SIRPα signaling in adult SIRPα-mutant mice resulted ...

OBJECTIVE To investigate the possible influence of follicular maturation and luteinization on anti-müllerian hormone (AMH) secretion and the relationship between per-follicle AMH levels, ovarian follicular status, and responsiveness to controlled ovarian hyperstimulation (COH). DESIGN Prospective study. SETTING University hospital in France. PATIENT(S) Thirty seven in vitro fertilization/...