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Oocytes induction

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https://www.readbyqxmd.com/read/28776797/micrornas-are-differentially-abundant-during-aedes-albopictus-diapause-maintenance-but-not-diapause-induction
#1
Z A Batz, A C Goff, P A Armbruster
Diapause is a programmed dormancy that allows organisms to tolerate predictable periods of unfavourable conditions by temporarily halting development and reducing metabolism. Diapause is widespread amongst insects and is crucial for allowing organisms to coordinate their growth and reproduction with favourable environmental conditions. Although the adaptive significance of diapause is well understood, the molecular mechanisms underpinning diapause remain unresolved. We performed high-throughput sequencing to investigate the role of microRNAs (miRNAs) in the diapause of the Asian tiger mosquito, Aedes albopictus...
August 4, 2017: Insect Molecular Biology
https://www.readbyqxmd.com/read/28752967/-expression-of-hsp70-in-kunming-mouse-embryos-stimulated-by-chronic-mild-anticipatory-stress
#2
Xiao-Hong Li, Shan Luo, Wei Fan, Xun Zeng, Yu Bai, Lang Qin, Shang-Wei Li
OBJECTIVE: To measure the expression of heat shock protein 70 (HSP70) in mice embryos with the stimulation of chronic mild anticipatory stress (CUMS) to female Kunming mice. METHODS: Three hundreds female Kunming mice were stressed by 9 chronic mild unpredictable stress factors for 28 days and then divided into three groups of mild, moderate and severe stress. PMSG/hCG was measured to assess the induction of superovulation, and ovarian response and embryo development potential were observed...
July 2017: Sichuan da Xue Xue Bao. Yi Xue Ban, Journal of Sichuan University. Medical Science Edition
https://www.readbyqxmd.com/read/28745404/testicular-oocytes-in-smallmouth-bass-in-northeastern-minnesota-in-relation-to-varying-levels-of-human-activity
#3
Sarah M Kadlec, Rodney D Johnson, David R Mount, Jennifer H Olker, Brian D Borkholder, Patrick K Schoff
Testicular oocytes (TOs) have been found in black basses (Micropterus spp.) from many locations in North America. The presence of TOs is often assumed to imply exposure to estrogenic endocrine disrupting compounds (EDCs), however, a definitive causal relationship has yet to be established, and TO prevalence is not consistently low in fish from areas lacking evident EDC sources. This might indicate any of a number of situations: (a) unknown or unidentified EDCs or EDC sources, (b) induction of TOs by other stressors, or (c) TOs occurring spontaneously during normal development...
July 26, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28744861/gonadal-morphogenesis-and-sex-differentiation-in-cultured-ussuri-catfish-tachysurus-ussuriensis
#4
Z J Pan, C K Zhu, H Wang, F J Zhou, X G Qiang
The objective of this study was to investigate the optimal developmental time to perform sex reversal in Ussuri catfish Tachysurus ussuriensis, to develop monosex breeding in aquaculture. Systematic observations of gonadal sex differentiation of P. ussiriensis were conducted. The genital ridge formed at 9 days post fertilization (dpf) and germ cells begin to proliferate at 17 dpf. The ovarian cavity began forming on 21 dpf and completed by 25 dpf while presumptive testis remained quiescent. The primary oocytes were at the chromatin nucleolus stage by 30 dpf, the peri-nucleolus stage by 44 dpf and the cortical alveoli stage by 64 dpf...
July 26, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28740075/the-lipid-peroxidation-product-4-hydroxynonenal-contributes-to-oxidative-stress-mediated-deterioration-of-the-ageing-oocyte
#5
Bettina P Mihalas, Geoffry N De Iuliis, Kate A Redgrove, Eileen A McLaughlin, Brett Nixon
An increase in intraovarian reactive oxygen species (ROS) has long been implicated in the decline in oocyte quality associated with maternal ageing. Oxidative stress (OS)-induced lipid peroxidation and the consequent generation of highly electrophilic aldehydes, such as 4-hydroxynonenal (4-HNE), represents a potential mechanism by which ROS can inflict damage in the ageing oocyte. In this study, we have established that aged oocytes are vulnerable to damage by 4-HNE resulting from increased cytosolic ROS production within the oocyte itself...
July 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28736154/retinoic-acid-induces-differentiation-of-buffalo-bubalus-bubalis-embryonic-stem-cells-into-germ-cells
#6
Syed Mohmad Shah, Suresh Kumar Singla, Prabhat Palta, Radhey Sham Manik, Manmohan Singh Chauhan
Development of precise and reproducible culture system for in vitro differentiation of embryonic stem (ES) cells into germ cells counts as a major leap forward for understanding not only the remarkable process of gametogenesis, otherwise obscured by limited availability of precursor primordial germ cells (PGCs), but in finally treating the catastrophic infertility. Taking into account the significant role of retinoic acid (RA) during in vivo gametogenesis, we designed the present study to investigate the effects of its stimulation on directing the differentiation of ES cells into germ cells...
July 19, 2017: Gene
https://www.readbyqxmd.com/read/28679462/analysis-of-zp1-gene-reveals-differences-in-zona-pellucida-composition-in-carnivores
#7
C Moros-Nicolás, A Leza, P Chevret, A Guillén-Martínez, L González-Brusi, F Boué, M Lopez-Bejar, J Ballesta, M Avilés, M J Izquierdo-Rico
The zona pellucida (ZP) is an extracellular envelope that surrounds mammalian oocytes. This coat participates in the interaction between gametes, induction of the acrosome reaction, block of polyspermy and protection of the oviductal embryo. Previous studies suggested that carnivore ZP was formed by three glycoproteins (ZP2, ZP3 and ZP4), with ZP1 being a pseudogene. However, a recent study in the cat found that all four proteins were expressed. In the present study, in silico and molecular analyses were performed in several carnivores to clarify the ZP composition in this order of mammals...
July 6, 2017: Reproduction, Fertility, and Development
https://www.readbyqxmd.com/read/28675921/cycle-regimens-for-frozen-thawed-embryo-transfer
#8
REVIEW
Tarek Ghobara, Tarek A Gelbaya, Reuben Olugbenga Ayeleke
BACKGROUND: Among subfertile couples undergoing assisted reproductive technology (ART), pregnancy rates following frozen-thawed embryo transfer (FET) treatment cycles have historically been found to be lower than following embryo transfer undertaken two to five days following oocyte retrieval. Nevertheless, FET increases the cumulative pregnancy rate, reduces cost, is relatively simple to undertake and can be accomplished in a shorter time period than repeated in vitro fertilisation (IVF) or intracytoplasmic sperm injection (ICSI) cycles with fresh embryo transfer...
July 5, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/28669364/expression-of-markers-for-germ-cells-and-oocytes-in-cow-dermal-fibroblast-treated-with-5-azacytidine-and-cultured-in-differentiation-medium-containing-bmp2-bmp4-or-follicular-fluid
#9
José Jackson do Nascimento Costa, Glaucinete Borges de Souza, Joyla Maria Pires Bernardo, Regislane Pinto Ribeiro, José Renato de Souza Passos, Francisco Taiã Gomes Bezerra, Márcia Viviane Alves Saraiva, José Roberto Viana Silva
This study aims to investigate the effect 5-azacytidine (5-Aza) during induction of pluripotency in bovine fibroblasts and to evaluate the effects of BMP2, BMP4 or follicular fluid in the differentiation of reprogrammed fibroblasts in primordial germ cells and oocytes. It also analysis the mRNA levels for OCT4, NANOG, REX, SOX2, VASA, DAZL, cKIT, SCP3, ZPA and GDF9 after culturing 5-Aza treated fibroblasts in the different tested medium. Dermal fibroblasts were cultured and exposed to 0.5, 1.0 or 2.0 μM of 5-Aza for 18 h, 36 h or 72 h...
June 2017: Zygote: the Biology of Gametes and Early Embryos
https://www.readbyqxmd.com/read/28654896/epigenetic-regulation-during-the-differentiation-of-stem-cells-to-germ-cells
#10
REVIEW
Yuan-Chao Sun, Yong-Yong Wang, Wei Ge, Shun-Feng Cheng, Paul W Dyce, Wei Shen
Gametogenesis is an essential process to ensure the transfer of genetic information from one generation to the next. It also provides a mechanism by which genetic evolution can take place. Although the genome of primordial germ cells (PGCs) is exactly the same with somatic cells within an organism, there are significant differences between their developments. For example, PGCs eventually undergo meiosis to become functional haploid gametes, and prior to that they undergo epigenetic imprinting which greatly alter their genetic regulation...
June 12, 2017: Oncotarget
https://www.readbyqxmd.com/read/28640859/toxic-effects-of-atrazine-on-porcine-oocytes-and-possible-mechanisms-of-action
#11
Bao Yuan, Shuang Liang, Yong-Xun Jin, Ming-Jun Zhang, Jia-Bao Zhang, Nam-Hyung Kim
Because atrazine is a widely used herbicide, its adverse effects on the reproductive system have been extensively researched. In this study, we investigated the effects of atrazine exposure on porcine oocyte maturation and the possible mechanisms. Our results showed that the rates of oocyte maturation significantly decreased after treatment with 200 μM atrazine in vitro. Atrazine treatment resulted in abnormal spindle morphology but did not affect actin distribution. Atrazine exposure not only triggered a DNA damage response but also decreased MPF levels in porcine oocytes...
2017: PloS One
https://www.readbyqxmd.com/read/28617866/characterization-of-trace-metal-content-in-the-developing-zebrafish-embryo
#12
Rebecca T Thomason, Michael A Pettiglio, Carolina Herrera, Clara Kao, Jonathan D Gitlin, Thomas B Bartnikas
Trace metals are essential for health but toxic when present in excess. The maintenance of trace metals at physiologic levels reflects both import and export by cells and absorption and excretion by organs. The mechanism by which this maintenance is achieved in vertebrate organisms is incompletely understood. To explore this, we chose zebrafish as our model organism, as they are amenable to both pharmacologic and genetic manipulation and comprise an ideal system for genetic screens and toxicological studies...
2017: PloS One
https://www.readbyqxmd.com/read/28609806/what-do-infertile-women-think-about-oocyte-reception-oocyte-donation-and-child-adoption
#13
Juliana Straehl, Lúcia Alves da Silva Lara, Marcos Felipe Silva de Sá, Rosana Maria Reis, Ana Carolina Japur de Sá Rosa-E-Silva
Purpose The views of infertile couples regarding oocyte donation by third parties and adoption are unknown, as these may be interpreted as a final closure of the available options for conception. This study aimed to determine the acceptance of oocyte donation, oocyte reception, and child adoption of infertile women who submitted to assisted reproductive technology (ART) treatment Methods Sixty-nine women who were under treatment for infertility and submitted to ART procedures were included in this cross-sectional study...
June 2017: Revista Brasileira de Ginecologia e Obstetrícia
https://www.readbyqxmd.com/read/28609269/corifollitropin-alfa-compared-to-daily-rfsh-or-hp-hmg-in-gnrh-antagonist-controlled-ovarian-stimulation-protocol-for-patients-undergoing-assisted-reproduction
#14
Priscila Morais Galvão Souza, Bruno Ramalho de Carvalho, Hitomi Miura Nakagawa, Thalita Reis Esselin Rassi, Antônio César Paes Barbosa, Adelino Amaral Silva
OBJECTIVE: This study aimed to compare the outcomes of controlled ovarian stimulation (COS) with corifollitropin alfa versus daily recombinant follicle-stimulating hormone (rRFSH) or highly purified human menopausal gonadotropin (HP-HMG) in patients undergoing in vitro fertilization (IVF) cycles based on gonadotropin-releasing hormone (GnRH) antagonist protocols. The primary endpoints were total number of oocytes and mature oocytes. METHODS: This retrospective study looked into 132 controlled ovarian stimulation cycles from IVF or oocyte cryopreservation performed in a private human reproduction center between January 1 and December 31, 2014...
June 1, 2017: JBRA Assisted Reproduction
https://www.readbyqxmd.com/read/28600501/hatching-enzymes-disrupt-aberrant-gonadal-degeneration-by-the-autophagy-apoptosis-cell-fate-decision
#15
Tapas Chakraborty, Sipra Mohapatra, Megumi Tobayama, Kayoko Ohta, Yong-Woon Ryu, Yukinori Kazeto, Kohei Ohta, Linyan Zhou, Yoshitaka Nagahama, Takahiro Matsubara
Environmental stressors, gonadal degenerative diseases and tumour development can significantly alter the oocyte physiology, and species fertility and fitness. To expand the molecular understanding about oocyte degradation, we isolated several spliced variants of Japanese anchovy hatching enzymes (AcHEs; ovastacin homologue) 1 and 2, and analysed their potential in oocyte sustenance. Particularly, AcHE1b, an ovary-specific, steroid-regulated, methylation-dependent, stress-responsive isoform, was neofunctionalized to regulate autophagic oocyte degeneration...
June 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28585705/ganglioside-gm3-induces-cumulus-cell-apoptosis-through-inhibition-of-epidermal-growth-factor-receptor-mediated-pi3k-akt-signaling-pathways-during-in-vitro-maturation-of-pig-oocytes
#16
Hyo-Jin Park, Sung-Kyu Chae, Jin-Woo Kim, Seul-Gi Yang, Jae-Min Jung, Min-Ji Kim, Gabbine Wee, Dong-Seok Lee, Sun-Uk Kim, Deog-Bon Koo
Gangliosides are components of the mammalian plasma membrane that help regulate receptor signaling. Ganglioside GM3, for example, plays an important role in initiating apoptosis in cancer cells; however, physiological roles for GM3 in normal processes, such as during pig oocyte maturation, are not clear. The aim of this study was to investigate the functional link between GM3 and cellular apoptosis in porcine cumulus-oocyte-complexes (COCs) during in vitro maturation. Our results indicated that denuded oocytes possess less ST3GAL5, a GM3-synthesizing enzyme, than cumulus cells or COCs after 44 hr of in vitro maturation...
June 6, 2017: Molecular Reproduction and Development
https://www.readbyqxmd.com/read/28578436/gonadotropin-releasing-hormone-agonist-triggering-with-concomitant-administration-of-low-doses-of-human-chorionic-gonadotropin-or-a-freeze-all-strategy-in-high-responders
#17
Meric Karacan, Erkan Erdem, Akin Usta, Ayse Arvas, Ziya Cebi, Teksen Camlibel
To compare the live birth rates and moderate/severe ovarian hyperstimulation syndrome (OHSS) rates of 2 different approaches using gonadotropin-releasing hormone (GnRH) agonist triggering in high responder women. Methods: A retrospective cohort study was performed to evaluate intracytoplasmic sperm injection (ICSI) and embryo transfer (ET) outcomes in high responder women who underwent ovulation induction with a GnRH antagonist protocol between April 2011 and March 2015. In group 1 (n=74), GnRH agonist was used for ovulation triggering with the concomitant use of 1500 IU of urinary human chorionic gonadotropin (hCG) immediately after oocyte retrieval followed by fresh ET and standard luteal support...
June 2017: Saudi Medical Journal
https://www.readbyqxmd.com/read/28561655/fertility-cardiac-and-orthopedic-challenges-in-survivors-of-adult-and-childhood-sarcoma
#18
Emma R Lipshultz, Ginger E Holt, Ranjith Ramasamy, Raphael Yechieli, Steven E Lipshultz
The combination of cisplatin, doxorubicin, and methotrexate was established as the standard backbone of contemporary osteosarcoma therapy in 1986. Since then, however, further improving the survival of patients with osteosarcoma has been challenging-30% to 40% of patients with osteosarcoma still die of this disease. In addition, these patients often experience loss of fertility at a young age, short- and long-term treatment-related cardiotoxicity, and adverse orthopedic effects from surgical resection of the tumor or endoprosthetic reconstructions...
2017: American Society of Clinical Oncology Educational Book
https://www.readbyqxmd.com/read/28526652/retinoic-acid-induces-differentiation-of-buffalo-bubalus-bubalis-embryonic-stem-cells-into-germ-cells
#19
Syed Mohmad Shah, Suresh Kumar Singla, Prabhat Palta, Radhey Sham Manik, Manmohan Singh Chauhan
Development of precise and reproducible culture system for in vitro differentiation of embryonic stem (ES) cells into germ cells counts as a major leap forward for understanding not only the remarkable process of gametogenesis, otherwise obscured by limited availability of precursor primordial germ cells (PGCs), but in finally treating the catastrophic infertility. Taking into account the significant role of retinoic acid (RA) during in vivo gametogenesis, we designed the present study to investigate the effects of its stimulation on directing the differentiation of ES cells into germ cells...
August 30, 2017: Gene
https://www.readbyqxmd.com/read/28520729/top-quality-blastocyst-formation-rates-in-relation-to-progesterone-levels-on-the-day-of-oocyte-maturation-in-gnrh-antagonist-ivf-icsi-cycles
#20
V S Vanni, E Somigliana, M Reschini, L Pagliardini, E Marotta, S Faulisi, A Paffoni, P Vigano', W Vegetti, M Candiani, E Papaleo
Cycles with progesterone elevation during controlled ovarian stimulation (COS) for IVF/ICSI are commonly managed with a "freeze-all" strategy, due to a well-recognized detrimental effect of high progesterone levels on endometrial receptivity. However, also a detrimental effect of elevated progesterone on day-3 embryo quality has recently been found with regards to top quality embryo formation rate. Because blastocyst culture and cryopreservation are largely adopted, we deemed relevant to determine whether this detrimental effect is also seen on blastocyst quality on day 5-6...
2017: PloS One
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