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https://www.readbyqxmd.com/read/28643503/the-use-of-morphokinetic-as-a-predictor-of-implantation
#1
Alberto Tejera, Belén Aparicio-Ruiz, Marcos Meseguer
In recent years the increased efforts intended for improving future outcomes in the laboratory have focused mostly on the search of additional markers of embryo quality to add up present embryo selection criteria. Time-lapse system involves an alternative tool in assisted reproduction techniques, being able to improve the embryo selection from a dynamic and interactive approach while standard embryo assessment implies a subjective and static morphology evaluation and consequently reducing the information gained for embryo selection, time-lapse technology adds several morphokinetic parameters, providing additional input for embryo evaluation...
June 22, 2017: Minerva Ginecologica
https://www.readbyqxmd.com/read/28642151/the-role-of-the-lb-structural-loop-and-its-interactions-with-the-pdz-domain-of-the-human-htra3-protease
#2
Tomasz Wenta, Przemysław Glaza, Mirosław Jarząb, Urszula Zarzecka, Dorota Żurawa-Janicka, Adam Lesner, Joanna Skórko-Glonek, Barbara Lipińska
Human HtrA3 protease is a proapoptotic protein, involved in embryo implantation and oncogenesis. In stress conditions the protease is activated by removal of its N-terminal domain. The activated form, ΔN-HtrA3L is a homotrimer composed of the protease (PD) and PDZ domains. The LB structural loop of the PD is longer by six amino acid residues than its counterparts of other human HtrA proteins and interacts with the PDZ in a way not observed in other known HtrA structures. By size exclusion chromatography of the ΔN-HtrA3L mutated variants we found that removal of the additional LB loop residues caused a complete loss of the proper trimeric structure while impairing their interactions with the PDZ domain decreased the amount of the trimers...
June 19, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28638003/molecular-and-cellular-events-during-blastocyst-implantation-in-the-receptive-uterus-clues-from-mouse-models
#3
Hiromichi Matsumoto
The success of implantation is an interactive process between the blastocyst and the uterus. Synchronized development of embryos with uterine differentiation to a receptive state is necessary to complete pregnancy. The period of uterine receptivity for implantation is limited and referred to as the "implantation window", which is regulated by ovarian steroid hormones. Implantation process is complicated due to the many signaling molecules in the hierarchical mechanisms with the embryo-uterine dialogue. The mouse is widely used in animal research, and is uniquely suited for reproductive studies, i...
June 22, 2017: Journal of Reproduction and Development
https://www.readbyqxmd.com/read/28637981/effects-of-vascular-endothelial-growth-factor-on-osteoblasts-around-dental-implants-in-vitro-and-in-vivo
#4
Mengkai Guang, Bo Huang, Yang Yao, Liang Zhang, Bo Yang, Ping Gong
Vasculogenesis is a pivotal procedure during dental implant osseointegration and bone repair process. Vascular endothelial growth factor (VEGF), regarded as one of the most important vasculogenesis factor, also plays a central role in bone repair, but its role around dental implants is still unknown. In the present study, rat primary osteoblasts seeded on titanium discs were tested using proliferation, enzyme-linked immunosorbent assay, Real-time PCR, and alkaline phosphatase (ALP) expression. Chicken embryo chorioallantoic membrane (CAM) was used to test the vasculogenesis property...
2017: Journal of Oral Science
https://www.readbyqxmd.com/read/28637295/inhibition-of-polyamine-synthesis-causes-entry-of-the-mouse-blastocyst-into-embryonic-diapause1
#5
Jane C Fenelon, Bruce D Murphy
Embryonic diapause is a common reproductive strategy amongst mammals, requiring an intimate cross-talk between the endometrium and the blastocyst. To date, the precise molecular signals responsible are unknown in the mouse or any other mammal. Previous studies in the mink implicate polyamines as major regulators of the control of diapause. In the mouse, inhibiting the rate-limiting enzyme of polyamine synthesis, ornithine decarboxylase (ODC1) during early pregnancy largely prevents implantation, but the fate of the non-implanted embryos is unknown...
June 16, 2017: Biology of Reproduction
https://www.readbyqxmd.com/read/28635583/cigarette-smoke-is-associated-with-altered-expression-of-antioxidant-enzymes-in-granulosa-cells-from-women-undergoing-in-vitro-fertilization
#6
Maria Cristina Budani, Erminia Carletti, Gian Mario Tiboni
This study was undertaken to evaluate whether cigarette smoke is associated with changes in the expression of antioxidant enzymes in granulosa cells of women undergoing IVF treatments. For this aim, the expression of three antioxidant enzymes (SOD1, SOD2 and catalase) in non-smokers (n = 20) and smokers (n = 20) was analyzed. There was a statistically significant overexpression of SOD2 and catalase mRNA levels in smokers in comparison with non-smokers. Cigarette smoking was associated with a lower fertilization rate, implantation rate and pregnancy rate in comparison with non-smokers...
June 21, 2017: Zygote: the Biology of Gametes and Early Embryos
https://www.readbyqxmd.com/read/28634372/dna-methylation-changes-in-endometrium-and-correlation-with-gene-expression-during-the-transition-from-pre-receptive-to-receptive-phase
#7
Viktorija Kukushkina, Vijayachitra Modhukur, Marina Suhorutšenko, Maire Peters, Reedik Mägi, Nilufer Rahmioglu, Agne Velthut-Meikas, Signe Altmäe, Francisco J Esteban, Jaak Vilo, Krina Zondervan, Andres Salumets, Triin Laisk-Podar
The inner uterine lining (endometrium) is a unique tissue going through remarkable changes each menstrual cycle. Endometrium has its characteristic DNA methylation profile, although not much is known about the endometrial methylome changes throughout the menstrual cycle. The impact of methylome changes on gene expression and thereby on the function of the tissue, including establishing receptivity to implanting embryo, is also unclear. Therefore, this study used genome-wide technologies to characterize the methylome and the correlation between DNA methylation and gene expression in endometrial biopsies collected from 17 healthy fertile-aged women from pre-receptive and receptive phase within one menstrual cycle...
June 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28633287/genetic-diseases-and-aneuploidies-can-be-detected-with-a-single-blastocyst-biopsy-a-successful-clinical-approach
#8
Maria Giulia Minasi, Francesco Fiorentino, Alessandra Ruberti, Anil Biricik, Elisabetta Cursio, Ettore Cotroneo, Maria Teresa Varricchio, Matteo Surdo, Francesca Spinella, Ermanno Greco
STUDY QUESTION: Can simultaneous detection of aneuploidies and genetic diseases or chromosomal aberrations in blastocysts reduce the chance of transferring embryos with low implantation potential, guaranteeing good clinical outcomes? SUMMARY ANSWER: The screening for chromosomal aneuploidies revealed that 50.6% of blastocysts diagnosed free of genetic disease or balanced, were aneuploid, therefore avoiding the transfer of blastocysts potentially resulting in implantation failures, miscarriages, or in some cases, in health affected live births...
June 12, 2017: Human Reproduction
https://www.readbyqxmd.com/read/28631552/effect-of-2-3-4-4-5-pentachlorobiphenyl-exposure-on-endometrial-receptivity-and-the-methylation-of-hoxa10
#9
Xin-Lan Qu, Ming-Zhang, Yuan-Fang, Hui Wang, Yuan-Zhen Zhang
Polychlorinated biphenyls (PCBs) are one of the most common endocrine-disrupting chemicals and have obvious toxicity on human reproductive development. The aim of our study was to investigate the toxicity of chronic 2,3',4,4',5-pentachlorobiphenyl (PCB 118) exposure on embryo implantation and endometrial receptivity, with the possible mechanism of DNA methylation involved. Virgin CD-1 female mice (3 weeks old) were housed and orally treated with PCB 118 (0, 1, 10, 100 μg/kg) for a month. After mating with fertile males, the pregnant mice were killed on gestation day 4...
January 1, 2017: Reproductive Sciences
https://www.readbyqxmd.com/read/28630707/evidence-of-endometrial-amino-acid-metabolism-and-transport-modulation-by-peri-ovulatory-endocrine-profiles-driving-uterine-receptivity
#10
Moana Rodrigues França, Maressa Izabel Santos da Silva, Guilherme Pugliesi, Veerle Van Hoeck, Mario Binelli
BACKGROUND: In beef cattle, changes in the periovulatory endocrine milieu are associated with fertility and conceptus growth. A large preovulatory follicle (POF) and the resulting elevated concentrations of progesterone (P4) during diestrus positively affect pregnancy rates. Amino acids (AA) are important components of maternally derived secretions that are crucial for embryonic survival before implantation. The hypothesis is that the size of the POF and the concentration of P4 in early diestrus modulate the endometrial abundance of SLC transcripts related to AA transport and metabolism and subsequently impact luminal concentrations of AA...
2017: Journal of Animal Science and Biotechnology
https://www.readbyqxmd.com/read/28630065/ccr5-is-involved-in-interruption-of-pregnancy-in-mice-infected-with-toxoplasma-gondii-during-early-pregnancy
#11
Maki Nishimura, Kousuke Umeda, Masayuki Suwa, Hidefumi Furuoka, Yoshifumi Nishikawa
Toxoplasmosis can cause abortion in pregnant humans and other animals; however, the mechanism of abortion remains unknown. C-C chemokine receptor type 5 (CCR5) is essential for host defense in T. gondii infection. To investigate the relationship between CCR5 and abortion in toxoplasmosis, we inoculated wild-type and CCR5-deficient (CCR5(-/-)) mice with T. gondii tachyzoites intraperitoneally on day 3 of pregnancy (E3). The pregnancy rate decreased as pregnancy progressed in the infected wild-type mice. Histopathologically, no inflammatory lesions were observed in the fetoplacental tissues...
June 19, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28629172/the-role-of-hcg-in-implantation-a-mini-review-of-molecular-and-clinical-evidence
#12
REVIEW
Antonis Makrigiannakis, Thomas Vrekoussis, Emmanouel Zoumakis, Sophia N Kalantaridou, Udo Jeschke
Embryo implantation is a complex process involving continuous molecular cross-talk between the embryo and the decidua. One of the key molecules during this process is human chorionic gonadotropin (HCG). HCG effectively modulates several metabolic pathways within the decidua contributing to endometrial receptivity. Herein, a brief overview of the molecular mechanisms regulated by HCG is presented. Furthermore, we summarize the existing evidence regarding the clinical impact on reproductive outcomes after endometrial priming with HCG prior to embryo transfer...
June 19, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28628266/embryo-maternal-dialogue-during-pregnancy-establishment-and-implantation-in-the-pig
#13
REVIEW
Agnieszka Waclawik, Monika M Kaczmarek, Agnieszka Blitek, Piotr Kaczynski, Adam J Ziecik
Porcine conceptuses secrete pregnancy-recognition signals (estrogens, including estradiol-17β) that inhibit luteolysis, thereby prolonging progesterone production by corpora lutea. The supportive mechanism by which the conceptus also inhibits luteolysis is by shifting endometrial prostaglandin (PG) synthesis to luteoprotective PGE2. Progesterone stimulates endometrial production of factors that are essential for conceptus development. Priming the uterus by progesterone and loss of progesterone receptors from the uterine epithelium by D1ay 10-12 after estrus are key for achieving endometrial receptivity for implantation...
June 19, 2017: Molecular Reproduction and Development
https://www.readbyqxmd.com/read/28628137/-antagonistic-effect-of-quercetin-on-pm2-5-toxicity-in-the-rat-s-embryonic-development-in-vitro
#14
A Q Fan, J Q Feng, W Liu, M J Zhang, T Liu, Y L Zhou, Y J Xu
OBJECTIVE: To explore the antagonistic effect of quercetin on fine particulate matter (PM2.5)-induced embryonic developmental toxicity in vitro. METHODS: PM2.5 was collected on glass fiber filters by PM2.5 samplers during the heating period of Dec. 2015 to Mar. 2016 in an area of Haidian District, Beijing City. The sampled filters were cut into 1 cm×3 cm pieces followed by sonication. The PM2.5 suspension was filtered into a 10 cm glass dish through 8 layers of sterile carbasus and stored at -80 °C until freeze drying...
June 18, 2017: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/28624458/dna-hypomethylation-circuit-of-mouse-rdna-repeats-in-the-germ-cell-lineage
#15
Asuka Furuta, Toshinobu Nakamura
DNA methylation is dynamically reprogrammed at two developmental periods, in primordial germ cells and pre-implantation embryos, via distinct phases of DNA demethylation and de novo methylation. Here we show that ribosomal DNA (rDNA) promoters are hypomethylated in sperm and oocytes; this hypomethyaltion was maintained during pre-implantation development. A DNA methylation analysis of embryonic and extra-embryonic cells on embryonic day 7.5 (E7.5) revealed that the rDNA promoter was slightly methylated in embryonic and extra-embryonic regions...
June 14, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28623139/the-co-expression-of-neogenin-with-sox2-in-hippocampal-neurons
#16
Namgue Hong, Mi-Hye Kim, Churl K Min, Hee Jung Kim, Jae Ho Lee
Dementia has been shown to be closely related with neuronal degeneration and/or a decrease in the activity of neural stem cells in many brain regions, including the hippocampus. It has been recently established that Neogenin is involved in the cell fate determination by regulating Oct3/4, SOX and Nanog, notable embryonic cell markers, expressions in pre-implantation mouse embryos. Further, Neogenin expression at both mRNA and protein levels is manifest in many brain regions in mice, but it remains unclear whether Neogenin expression is prerequisite for the maintenance of neural stem cells, particularly, playing a critical role in the hippocampus, a brain region known to be involved in memory generation and consolidation...
June 13, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28621958/-biomedical-perspective-of-the-surrogate-motherhood
#17
Nicolás Jouve de la Barreda
The subrogated motherhood takes place when an embryo created by in vitro fertilization (IVF) technology is implanted in a surrogate, sometimes called a gestational mother, by means a contract with her. It can imply to natural families (woman and man) with or without infertility problems, or to monoparental or biparental families of the same sex. Concerning the origin of the gametes used in the IVF emerges different implications on the genetic relationship of the resulting child with the surrogate and the future parents...
May 2017: Cuadernos de Bioética: Revista Oficial de la Asociación Española de Bioética y Ética Médica
https://www.readbyqxmd.com/read/28620352/efficacy-of-follicle-stimulating-hormone-fsh-alone-fsh%C3%A2-%C3%A2-luteinizing-hormone-human-menopausal-gonadotropin-or-fsh%C3%A2-%C3%A2-human-chorionic-gonadotropin-on-assisted-reproductive-technology-outcomes-in-the-personalized-medicine-era-a-meta-analysis
#18
Daniele Santi, Livio Casarini, Carlo Alviggi, Manuela Simoni
SETTING: Luteinizing hormone (LH) and human chorionic gonadotropin (hCG) act on the same receptor, activating different signal transduction pathways. The role of LH or hCG addition to follicle-stimulating hormone (FSH) as well as menopausal gonadotropins (human menopausal gonadotropin; hMG) in controlled ovarian stimulation (COS) is debated. OBJECTIVE: To compare FSH + LH, or FSH + hCG or hMG vs. FSH alone on COS outcomes. DESIGN: A meta-analysis according to PRISMA statement and Cochrane Collaboration was performed, including prospective, controlled clinical trials published until July 2016, enrolling women treated with FSH alone or combined with other gonadotropins...
2017: Frontiers in Endocrinology
https://www.readbyqxmd.com/read/28617534/afc-vs-amh-prediction-of-ovarian-response-in-women-with-endometrioma-undergoing-controlled-ovarian-stimulation
#19
A A Ersahin, H Arpaci, S S Ersahin, N Celik, M Acet
OBJECTIVE: To assess the clinical value of antral follicle count (AFC) and anti-Mullerian hormone (AMH) for the prediction of ovarian response in women with endometrioma undergoing controlled ovarian stimulation for IVF using GnRH antagonist treatment. PATIENTS AND METHODS: Fifty patients with endometrioma who underwent their first IVF/ICSI cycle with GnRH antagonist treatment were included in the study. The average AMH values were recorded as 1.5-2 ng/mL. Fifty infertile women are not suffering from endometrioma were selected from those with male factor infertility as control...
May 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/28614992/preimplantation-genetic-screening
#20
Joyce C Harper
Preimplantation genetic diagnosis was first successfully performed in 1989 as an alternative to prenatal diagnosis for couples at risk of transmitting a genetic or chromosomal abnormality, such as cystic fibrosis, to their child. From embryos generated in vitro, biopsied cells are genetically tested. From the mid-1990s, this technology has been employed as an embryo selection tool for patients undergoing in vitro fertilisation, screening as many chromosomes as possible, in the hope that selecting chromosomally normal embryos will lead to higher implantation and decreased miscarriage rates...
January 1, 2017: Journal of Medical Screening
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