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Human Reproduction Update

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https://www.readbyqxmd.com/read/29300905/reply-gnrh-antagonists-vs-long-gnrh-agonists-in-ivf-significant-flaws-in-a-meta-analysis-lead-to-invalid-conclusions
#1
C B Lambalk, F R Banga, J A Huirne, M Toftager, A Pinborg, R Homburg, F van der Veen, M van Wely
No abstract text is available yet for this article.
December 29, 2017: Human Reproduction Update
https://www.readbyqxmd.com/read/29300885/gnrh-antagonists-vs-long-gnrh-agonists-in-ivf-significant-flaws-in-a-meta-analysis-lead-to-invalid-conclusions
#2
Efstratios M Kolibianakis, Georg Griesinger, Christos A Venetis
No abstract text is available yet for this article.
December 29, 2017: Human Reproduction Update
https://www.readbyqxmd.com/read/29293982/combined-oral-contraceptives-and-or-antiandrogens-versus-insulin-sensitizers-for-polycystic-ovary-syndrome-a-systematic-review-and-meta-analysis
#3
Manuel Luque-Ramírez, Lía Nattero-Chávez, Andrés E Ortiz Flores, Héctor F Escobar-Morreale
BACKGROUND: Androgen excess is a key pathogenetic mechanism in polycystic ovary syndrome (PCOS), although hyperinsulinism also contributes to androgen secretion. Therapeutic approaches for adult patients not seeking fertility include combined oral contraceptives (COC), antiandrogens (AA) and/or insulin sensitizers, although these practices are supported by limited high-quality evidence. OBJECTIVE AND RATIONALE: We aimed to assess the efficacy and safety of these common treatments for PCOS by conducting a meta-analysis of RCTs with the following review questions: Which is the more appropriate therapeutic approach for hyperandrogenic symptoms, hyperandrogenemia, and ovulatory dysfunction in adult women with PCOS not seeking fertility; What is the impact on classic cardiometabolic risk factors of the more common treatments used in those women; Does the combination of the antiandrogenic therapy plus metformin have any impact on efficacy or cardiometabolic profile? SEARCH METHODS: We searched PubMed and EMBASE for articles published up to 16 September 2017...
December 27, 2017: Human Reproduction Update
https://www.readbyqxmd.com/read/29281008/testicular-organoids-a-new-model-to-study-the-testicular-microenvironment-in-vitro
#4
João Pedro Alves-Lopes, Jan-Bernd Stukenborg
BACKGROUND: In recent decades, a broad range of strategies have been applied to model the testicular microenvironment in vitro. These models have been utilized to study testicular physiology and development. However, a system that allows investigations into testicular organogenesis and its impact in the spermatogonial stem-cell (SSC) niche in vitro has not been developed yet. Recently, the creation of tissue-specific organ-like structures called organoids has resurged, helping researchers to answer scientific questions that previous in vitro models could not help to elucidate...
December 21, 2017: Human Reproduction Update
https://www.readbyqxmd.com/read/29244163/regulation-of-chromosome-segregation-in-oocytes-and-the-cellular-basis-for-female-meiotic-errors
#5
Jessica Greaney, Zhe Wei, Hayden Homer
BACKGROUND: Meiotic chromosome segregation in human oocytes is notoriously error-prone, especially with ageing. Such errors markedly reduce the reproductive chances of increasing numbers of women embarking on pregnancy later in life. However, understanding the basis for these errors is hampered by limited access to human oocytes. OBJECTIVE AND RATIONALE: Important new discoveries have arisen from molecular analyses of human female recombination and aneuploidy along with high-resolution analyses of human oocyte maturation and mouse models...
December 13, 2017: Human Reproduction Update
https://www.readbyqxmd.com/read/29190351/the-associations-of-thiopurines-with-male-fertility-and-paternally-exposed-offspring-a-systematic-review-and-meta-analysis
#6
Melek Simsek, Cornelis B Lambalk, Janneke A Wilschut, Chris J J Mulder, Nanne K H de Boer
BACKGROUND: Thiopurines are widely used immunosuppressive agents. In high dosages, they inhibit the purine synthesis and are considered to be possibly harmful to spermatogenesis, and subsequently to men's fertility and their offspring. However, the clear association between thiopurine exposure and male fertility and reproduction safety, if any, is still poorly understood. OBJECTIVE AND RATIONALE: The aim of this review was to systematically summarize and meta-analyse the available data, derived from animal and human studies, regarding the influence of thiopurine exposure on fertility and conception safety in men and their offspring...
November 28, 2017: Human Reproduction Update
https://www.readbyqxmd.com/read/29155965/is-frozen-embryo-transfer-better-for-mothers-and-babies-can-cumulative-meta-analysis-provide-a-definitive-answer
#7
Abha Maheshwari, Shilpi Pandey, Edwin Amalraj Raja, Ashalatha Shetty, Mark Hamilton, Siladitya Bhattacharya
BACKGROUND: Initial observational studies and a systematic review published 5 years ago have suggested that obstetric and perinatal outcomes are better in offspring conceived following frozen rather than fresh embryo transfers, with reduced risks of preterm birth, small for gestational age, low birth weight and pre-eclampsia. More recent primary studies are beginning to challenge some of these findings. We therefore conducted an updated systematic review and cumulative meta-analysis to examine if these results have remained consistent over time...
November 13, 2017: Human Reproduction Update
https://www.readbyqxmd.com/read/29136166/diabetes-induced-hyperglycemia-impairs-male-reproductive-function-a-systematic-review
#8
Constanze C Maresch, Dina C Stute, Marco G Alves, Pedro F Oliveira, David M de Kretser, Thomas Linn
BACKGROUND: Hyperglycemia can result from a loss of pancreatic beta-cells or a decline in their function leading to decreased insulin secretion or may arise from insulin resistance and variable degrees of inadequate insulin secretion resulting in diabetes and related comorbidities. To date several reviews have addressed the issue of diabetes-related male infertility but most have focused on how metabolic syndrome causes the decline in male fertility. However, a comprehensive overview as to how diabetes-induced hyperglycemia impairs male fertility is missing...
November 10, 2017: Human Reproduction Update
https://www.readbyqxmd.com/read/29186429/extracellular-matrix-in-uterine-leiomyoma-pathogenesis-a-potential-target-for-future-therapeutics
#9
Md Soriful Islam, Andrea Ciavattini, Felice Petraglia, Mario Castellucci, Pasquapina Ciarmela
BACKGROUND: Uterine leiomyoma (also known as fibroid or myoma) is the most common benign tumor of the uterus found in women of reproductive age. It is not usually fatal but can produce serious clinical symptoms, including excessive uterine bleeding, pelvic pain or pressure, infertility and pregnancy complications. Due to lack of effective medical treatments surgery has been a definitive choice for the management of this tumor. OBJECTIVE AND RATIONALE: Extracellular matrix (ECM) accumulation and remodeling are thought to be crucial for fibrotic diseases such as uterine leiomyoma...
January 1, 2018: Human Reproduction Update
https://www.readbyqxmd.com/read/29077897/in-vivo-oxygen-temperature-and-ph-dynamics-in-the-female-reproductive-tract-and-their-importance-in-human-conception-a-systematic-review
#10
Ka Ying Bonnie Ng, Roel Mingels, Hywel Morgan, Nick Macklon, Ying Cheong
BACKGROUND: Despite advances in ART, implantation and pregnancy rates per embryo transfer still remain low. IVF laboratories strive to ensure that the process of handling gametes in vitro closely mimics the in vivo environment. However, there remains a lack of knowledge regarding the in vivo regulation and dynamic variation in biophysical parameters such as oxygen concentration, pH and temperature within the reproductive tract. OBJECTIVE AND RATIONALE: To undertake a systematic review of the current understanding of the physico-chemical parameters of oxygen tension (pO2), pH and temperature within the female reproductive tract, and their potential implications in clinical and pathological processes related to fertility and those pertaining to limited reproductive capacity...
January 1, 2018: Human Reproduction Update
https://www.readbyqxmd.com/read/29029246/the-epidermal-growth-factor-network-role-in-oocyte-growth-maturation-and-developmental-competence
#11
Dulama Richani, Robert B Gilchrist
BACKGROUND: The LH surge induces great physiological changes within the preovulatory follicle, which culminate in the ovulation of a mature oocyte that is capable of supporting embryo and foetal development. However, unlike mural granulosa cells, the oocyte and its surrounding cumulus cells are not directly responsive to LH, indicating that the LH signal is mediated by secondary factors produced by the granulosa cells. The mechanisms by which the oocyte senses the ovulatory LH signal and hence prepares for ovulation has been a subject of considerable controversy for the past four decades...
January 1, 2018: Human Reproduction Update
https://www.readbyqxmd.com/read/29069503/metabolomics-as-a-tool-to-identify-biomarkers-to-predict-and-improve-outcomes-in-reproductive-medicine-a-systematic-review
#12
Timothy Bracewell-Milnes, Srdjan Saso, Hossam Abdalla, Dimitrios Nikolau, Julian Norman-Taylor, Mark Johnson, Elaine Holmes, Meen-Yau Thum
BACKGROUND: Infertility is a complex disorder with significant medical, psychological and financial consequences for patients. With live-birth rates per cycle below 30% and a drive from the Human Fertilisation and Embryology Authority (HFEA) to encourage single embryo transfer, there is significant research in different areas aiming to improve success rates of fertility treatments. One such area is investigating the causes of infertility at a molecular level, and metabolomics techniques provide a platform for studying relevant biofluids in the reproductive tract...
November 1, 2017: Human Reproduction Update
https://www.readbyqxmd.com/read/28981654/temporal-trends-in-sperm-count-a-systematic-review-and-meta-regression-analysis
#13
Hagai Levine, Niels Jørgensen, Anderson Martino-Andrade, Jaime Mendiola, Dan Weksler-Derri, Irina Mindlis, Rachel Pinotti, Shanna H Swan
BACKGROUND: Reported declines in sperm counts remain controversial today and recent trends are unknown. A definitive meta-analysis is critical given the predictive value of sperm count for fertility, morbidity and mortality. OBJECTIVE AND RATIONALE: To provide a systematic review and meta-regression analysis of recent trends in sperm counts as measured by sperm concentration (SC) and total sperm count (TSC), and their modification by fertility and geographic group...
November 1, 2017: Human Reproduction Update
https://www.readbyqxmd.com/read/28981651/the-diagnosis-of-male-infertility-an-analysis-of-the-evidence-to-support-the-development-of-global-who-guidance-challenges-and-future-research-opportunities
#14
Christopher L R Barratt, Lars Björndahl, Christopher J De Jonge, Dolores J Lamb, Francisco Osorio Martini, Robert McLachlan, Robert D Oates, Sheryl van der Poel, Bianca St John, Mark Sigman, Rebecca Sokol, Herman Tournaye
BACKGROUND: Herein, we describe the consensus guideline methodology, summarize the evidence-based recommendations we provided to the World Health Organization (WHO) for their consideration in the development of global guidance and present a narrative review of the diagnosis of male infertility as related to the eight prioritized (problem or population (P), intervention (I), comparison (C) and outcome(s) (O) (PICO)) questions. Additionally, we discuss the challenges and research gaps identified during the synthesis of this evidence...
November 1, 2017: Human Reproduction Update
https://www.readbyqxmd.com/read/28961976/disentangling-puberty-novel-neuroendocrine-pathways-and-mechanisms-for-the-control-of-mammalian-puberty
#15
M S Avendaño, M J Vazquez, M Tena-Sempere
BACKGROUND: Puberty is a complex developmental event, controlled by sophisticated regulatory networks that integrate peripheral and internal cues and impinge at the brain centers driving the reproductive axis. The tempo of puberty is genetically determined but is also sensitive to numerous modifiers, from metabolic and sex steroid signals to environmental factors. Recent epidemiological evidence suggests that the onset of puberty is advancing in humans, through as yet unknown mechanisms...
November 1, 2017: Human Reproduction Update
https://www.readbyqxmd.com/read/28961822/human-female-meiosis-revised-new-insights-into-the-mechanisms-of-chromosome-segregation-and-aneuploidies-from-advanced-genomics-and-time-lapse-imaging
#16
Antonio Capalbo, Eva R Hoffmann, Danilo Cimadomo, Filippo Maria Ubaldi, Laura Rienzi
BACKGROUND: The unbalanced transmission of chromosomes in human gametes and early preimplantation embryos causes aneuploidy, which is a major cause of infertility and pregnancy failure. A baseline of 20% of human oocytes are estimated to be aneuploid and this increases exponentially from 30 to 35 years, reaching on average 80% by 42 years. As a result, reproductive senescence in human females is predominantly determined by the accelerated decline in genetic quality of oocytes from 30 years of age...
November 1, 2017: Human Reproduction Update
https://www.readbyqxmd.com/read/28961800/zika-virus-and-reproduction-facts-questions-and-current-management
#17
Sylvie Epelboin, Emmanuel Dulioust, Loïc Epelboin, Alexandra Benachi, Françoise Merlet, Catherine Patrat
BACKGROUND: Zika virus (ZIKV) is an arthropod-borne virus of the family Flaviviridae, genus Flavivirus. ZIKV is currently the focus of an ongoing pandemic and worldwide public health emergency. Although originally isolated in 1947, its pathogenesis was poorly known and very few documented infections were published until recently. Its route of transmission and its impact on reproduction and pregnancy have only recently begun to be disclosed. OBJECTIVE AND RATIONALE: This review summarizes the most recent knowledge about ZIKV infection and pathogenesis and focuses on its impacts on male and female genital tracts, including the risks of sexual transmission and to pregnancy...
November 1, 2017: Human Reproduction Update
https://www.readbyqxmd.com/read/28961722/how-effective-are-weight-loss-interventions-for-improving-fertility-in-women-and-men-who-are-overweight-or-obese-a-systematic-review-and-meta-analysis-of-the-evidence
#18
Damian Best, Alison Avenell, Siladitya Bhattacharya
BACKGROUND: The prevalence of obesity is increasing worldwide, with a corresponding increase in overweight and obese patients referred with infertility. This systematic review aimed to determine whether non-surgical weight reduction strategies result in an improvement in reproductive parameters affected by obesity, e.g. delayed time to pregnancy, oligozoospermia and azoospermia. No prior reviews have examined this within the general fertility population, or in both sexes. OBJECTIVE AND RATIONALE: Our objective was to answer the question: 'In overweight and obese women, men and couples seeking fertility treatment, what non-surgical weight-loss interventions have been used, and how effective are they at weight loss and improving reproductive outcomes?' SEARCH METHODS: An electronic search of MEDLINE, EMBASE and the Cochrane Library was performed for studies between January 1966 and March 2016...
November 1, 2017: Human Reproduction Update
https://www.readbyqxmd.com/read/29040571/patient-centered-early-pregnancy-care-a-systematic-review-of-quantitative-and-qualitative-studies-on-the-perspectives-of-women-and-their-partners
#19
M M J van den Berg, E A F Dancet, T Erlikh, F van der Veen, M Goddijn, P J Hajenius
BACKGROUND: Early pregnancy complications, defined as miscarriage, recurrent miscarriage or ectopic pregnancy, affect the physical and psychological well-being of intended parents. Research in this field so far has focused mainly on improving accuracy of diagnostic tests and safety and effectiveness of therapeutic management. An overview of aspects of care valued by women and/or their partners is missing. OBJECTIVE AND RATIONALE: This systematic review aims to provide an overview of aspects of care valued by women and/or their partners faced with early pregnancy complications and to identify potential targets for improvement in early pregnancy healthcare...
October 11, 2017: Human Reproduction Update
https://www.readbyqxmd.com/read/28903474/nitric-oxide-heat-shock-protein-axis-in-menopausal-hot-flushes-neglected-metabolic-issues-of-chronic-inflammatory-diseases-associated-with-deranged-heat-shock-response
#20
Antônio Azambuja Miragem, Paulo Ivo Homem de Bittencourt
BACKGROUND: Although some unequivocal underlying mechanisms of menopausal hot flushes have been demonstrated in animal models, the paucity of similar approaches in humans impedes further mechanistic outcomes. Human studies might show some as yet unexpected physiological mechanisms of metabolic adaptation that permeate the phase of decreased oestrogen levels in both symptomatic and asymptomatic women. This is particularly relevant because both the severity and time span of hot flushes are associated with increased risk of chronic inflammatory disease...
September 1, 2017: Human Reproduction Update
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