Georgios Christopoulos

Georgios Christopoulos
University College London Hospitals NHS Foundation Trust | uclh · Reproductive Medicine Unit

MRCOG MD(Res) PGDip DFSRH

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31
Publications
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397
Citations

Publications

Publications (31)
Article
Polycystic Ovary Syndrome (PCOS) is the most common endocrine disorder amongst women of reproductive age, whose aetiology remains unclear. To improve our understanding of the molecular mechanisms underlying the disease, we conducted a genome-wide DNA methylation profiling in granulosa lutein cells collected from 16 women suffering from PCOS, in com...
Article
Context Polycystic ovary syndrome (PCOS) is the commonest cause of anovulation. A key feature of PCOS is arrest of follicles at the small-medium sized antral stage. Objective and Design To provide further insight into the mechanism of follicle arrest in PCOS, we profiled; (1) gonadotropin receptors; (2) characteristics of aberrant steroidogenesis,...
Article
Introduction: Aberrant function of granulosa cells has been implicated in the pathophysiology of PCOS. Materials & methods: Granulosa lutein (GL) cells were collected during oocyte retrieval for IVF/ICSI. RT-qPCR was used to compare gene expression between 12 control women, 12 with ovulatory PCO and 12 with anovulatory PCOS. To examine which gen...
Article
The cover image, by A. Abbara et al., is based on the Original Article Clinical parameters of ovarian hyperstimulation syndrome following different hormonal triggers of oocyte maturation in IVF treatment, DOI: 10.1111/cen.13569.
Article
Full-text available
Objective: Ovarian hyperstimulation syndrome (OHSS) is a serious iatrogenic condition, predominantly related to the hormone used to induce oocyte maturation during IVF treatment. Kisspeptin is a hypothalamic neuropeptide that has recently been demonstrated to safely trigger final oocyte maturation during IVF treatment even in women at high risk of...
Article
STUDY QUESTION: What are the in vivo and in vitro actions of kisspeptin-54 on the expression of genes involved in ovarian reproductive function, steroidogenesis and ovarian hyperstimulation syndrome (OHSS) in granulosa lutein (GL) cells when compared with traditional triggers of oocyte maturation? SUMMARY ANSWER: The use of kisspeptin-54 as an oocy...
Chapter
Treatment of early breast cancer effects ovarian function and fertility in pre-menopausal women. Some women now choose to delay conception to a later age, when potentially a diagnosis of breast cancer may occur. Although many women are cured of their breast cancer long term, the opportunity to have children has to be explored at the time of diagnos...
Article
Objective: To assess the impact of non-cavity-distorting fibroids on in vitro fertilisation (IVF) pregnancy outcomes. Design: A retrospective, matched, single-centre, cohort study was performed. Setting: The IVF unit of a tertiary, university hospital. Population: We analysed all women with non-cavity-distorting uterine fibroids undergoing I...
Conference Paper
Introduction: Polycystic ovary syndrome (PCOS) is a common endocrine disorder, affecting 5–10% of women of reproductive age, and is the major cause of anovulatory infertility. Aberrant secretion and/or action of gonadotropins are implicated but, to date, we have only limited knowledge about the precise mechanisms involved. Recent genome wide associ...
Article
Background: Anti-Müllerian Hormone (AMH) and Antral Follicle Count (AFC) are both principally used as markers of ovarian reserve and available in all UK hospitals. The utility of these markers in the binary diagnosis of Polycystic Ovarian Syndrome (PCOS) by published criteria, such as Rotterdam, has been previously reported. We evaluated their util...
Conference Paper
Introduction: Polycystic ovary syndrome (PCOS) is a common endocrine disorder, affecting 5–10% of women of reproductive age, and is the major cause of anovulatory infertility and hyperandrogenism. Aberrant secretion and or action of gonadotropins are implicated but, to date, we have only limited knowledge about the precise mechanisms that are invol...
Article
Introduction: Polycystic ovary syndrome (PCOS) is a common endocrinopathy in premenopausal women and is associated with hyperandrogenism, anovulatory infertility, and metabolic abnormalities. Abnormalities in the steroidogenic pathway of both theca and granulosa cells have previously been reported, but there has been no comprehensive analysis of st...
Article
A retrospective, cohort study of high-risk patients undergoing IVF treatment was performed to assess if there is a difference in clinical pregnancy rate, live birth rate and the incidence of ovarian hyperstimulation syndrome, when a GnRH agonist (GnRHa) trigger with intensive luteal support is compared to human chorionic gonadotropin (hCG) with sta...
Article
We present a case series and literature review on the use of rescue human chorionic gonadotropin (hCG) in cases of empty follicle syndrome (EFS) after a gonadotropin-releasing hormone agonist (GnRHa) trigger. EFS was diagnosed after failure to collect any oocytes from one ovary. In such cases, a single dose of hCG was administered and the oocyte re...
Article
In Vitro Fertilization (IVF) treatment is an effective therapy for infertility, but can result in the potentially life-threatening complication 'ovarian hyperstimulation syndrome' (OHSS). To investigate whether kisspeptin-54 can be used to effectively and safely trigger oocyte maturation in women undergoing IVF treatment at high risk of developing...
Article
Full-text available
Patients with mutations that inactivate kisspeptin signaling are infertile. Kisspeptin-54, the major circulating isoform of kisspeptin in humans, potently stimulates reproductive hormone secretion in humans. Animal studies suggest that kisspeptin is involved in generation of the luteinizing hormone surge, which is required for ovulation; therefore,...
Article
Background: In vitro fertilisation (IVF) is an effective treatment for infertility, but can cause the ovarian hyper-stimulation syndrome (OHSS), which is associated with serous effusions, circulatory collapse, and even death. The use of human chorionic gonadotrophin (hCG) stimulates oocyte maturation during IVF, but is also the major cause of OHSS....
Article
A web-based survey was e-mailed to all specialty trainees ST Years 3-7 (n = 773) to assess their competence in emergency laparoscopic procedure. The trainees were asked about their competence level in a diagnostic laparoscopy; a salpingectomy; a salpingotomy; and an oophorectomy/cystectomy for adnexal torsion. Subsequently, they were asked how they...
Article
Background: IVF is an effective treatment for infertility, but can cause the ovarian hyper-stimulation syndrome (OHSS), which is associated with serous effusions, cardiac tamponade, circulatory collapse, and even death. Injection of human chorionic gonadotrophin (hCG) stimulates oocyte maturation during IVF, but is also the major cause of OHSS. The...
Article
Although in-vitro fertilisation (IVF) treatment allows infertile couples to conceive, it can result in a potentially life-threatening condition termed the ovarian hyperstimulation syndrome (OHSS). The major cause of OHSS is use of human chorionic gonadotropin (hCG) in current IVF protocols for initiating oocyte maturation. The development of a more...
Article
Ovarian torsion may have significant fertility implications. Interleukin-6 is a pro-inflammatory cytokine, which may act as a helpful diagnostic test. Our objective was to investigate the accuracy of serum interleukin-6 in the diagnosis of ovarian torsion in women with ultrasonographic evidence of an ovarian cyst. An electronic search of published...
Article
Full-text available
Study question What is the conservative estimate of age-specific cumulative live birth rates following minimal ovarian stimulation/natural cycle IVF in unselected infertile patients?

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