The levels of steroid hormones and cytokines in individual follicles are not associated with the fertilization outcome after intracytoplasmic sperm injection
Laboratory of Physiology, School of Medicine, Democritus University of Thrace, Alexandroupolis, Greece. Fertility and sterility
(Impact Factor: 4.59).
08/2008; 90(1):60-4. DOI: 10.1016/j.fertnstert.2007.05.054
To investigate the association between the levels of two steroid hormones and eight cytokines in fluids from individual follicles and the fertilization outcome of the oocytes derived from the same follicles.
Forty-three women participating in intracytoplasmic sperm injection (ICSI)/ET cycles.
The ovarian stimulation followed the multidose GnRH antagonist protocol. ICSI was performed in mature oocytes. The concentrations of estradiol, progesterone, tumor necrosis factor-alpha, interleukin (IL) -1beta, IL-6, vascular endothelial growth factor, leptin, basic fibroblast growth factor, epidermal growth factor, and insulin-like growth factor-I were measured by immunoassay methods in the follicles from which the mature oocytes were derived.
The concentrations of the above hormones and cytokines in individual follicles and the fertilization outcome of the oocytes derived from the same follicles.
The intrafollicular concentrations of the above factors were not significantly associated with the fertilization outcome. These factors were not correlated with embryo quality, with the exception of leptin, which was weakly associated with embryo score (R = 0.276).
The intrafollicular concentrations of the above factors cannot predict the fertilization outcome after ICSI.
Available from: Alberto Revelli
- "Other studies suggested that leptin levels in FF could not be considered a marker of oocyte quality and developmental potential . In recent studies, leptin was shown to be positively correlated with the fertilization rate , weekly associated with embryo morphological score, but not with the IVF outcome . At present, leptin concentration in FF does not appear to precisely reflect oocyte quality and to be useful for oocyte selection. "
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ABSTRACT: The assessment of oocyte quality in human in vitro fertilization (IVF) is getting increasing attention from embryologists. Oocyte selection and the identification of the best oocytes, in fact, would help to limit embryo overproduction and to improve the results of oocyte cryostorage programs. Follicular fluid (FF) is easily available during oocyte pick-up and theorically represents an optimal source on non-invasive biochemical predictors of oocyte quality. Unfortunately, however, the studies aiming to find a good molecular predictor of oocyte quality in FF were not able to identify substances that could be used as reliable markers of oocyte competence to fertilization, embryo development and pregnancy. In the last years, a well definite trend toward passing from the research of single molecular markers to more complex techniques that study all metabolites of FF has been observed. The metabolomic approach is a powerful tool to study biochemical predictors of oocyte quality in FF, but its application in this area is still at the beginning. This review provides an overview of the current knowledge about the biochemical predictors of oocyte quality in FF, describing both the results coming from studies on single biochemical markers and those deriving from the most recent studies of metabolomics.
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ABSTRACT: Leptin is involved not only in the regulation of food intake but also in other functions including reproduction. Because leptin has been demonstrated to influence ovarian steroidogenesis directly and leptin levels vary during the menstrual cycle and in stimulated cycles, we tested the hypothesis that serum or intrafollicular concentrations of leptin would correlate with reproductive outcomes in intracytoplasmic sperm injection cycles. Serum and follicular fluid samples were collected from 77 women undergoing ovarian stimulation, intracytoplasmic sperm injection and embryo transfer due to male factor infertility. The concentrations of total leptin, both in serum and in pooled follicular fluid samples, did not correlate with the number of oocytes, the fertilization rate or the embryo quality. Additionally, leptin concentrations did not differ between cycles that resulted in pregnancy and those that failed. These results raise objections to the prognostic value of leptin for the outcome of in vitro fertilization/intracytoplasmic sperm injection cycles.
Available from: Byron Asimakopoulos
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ABSTRACT: This study investigated the serum levels of resistin, adiponectin and leptin during the physiological menstrual cycle. Sixteen women (age: 19-30 years; body mass index: 19.46-24.9) with regular menstrual cycles participated. Fasting blood samples were collected on alternate days throughout a full menstrual cycle. Mean resistin concentrations were slightly higher during the luteal phase (5.30+/-0.23 ng/ml) compared to the follicular (4.68+/-0.07 ng/ml) and midcycle (4.86+/-0.09 ng/ml) phases (p=0.032). Mean leptin concentrations during the follicular phase (18.14+/-0.28 ng/ml) were significantly lower compared to the midcycle (21.79+/-0.29 ng/ml, p=0.006) and luteal phases (23.75+/-0.64 ng/ml, p<0.001). The variation of adiponectin concentrations throughout the menstrual cycle was not significant. According to the results, circulating resistin, likewise leptin concentrations vary significantly during the physiological menstrual cycle presenting with higher values during the luteal phase. This pattern, although its physiological importance is not clear, suggests that resistin, likewise to leptin, may have a role in the regulation of cyclic female reproductive functions. The stable adiponectin concentrations throughout the menstrual cycle indicate that this adipokine probably does not play a considerable role in female reproductive functions.
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