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https://www.readbyqxmd.com/read/29052321/coenzyme-q10-supplementation-during-in-vitro-maturation-of-bovine-oocytes-bos-taurus-helps-to-preserve-oocyte-integrity-after-vitrification
#1
M Ruiz-Conca, M Vendrell, M Sabés-Alsina, T Mogas, M Lopez-Bejar
Oocyte vitrification causes less cell stress than slow cooling, but cytoskeletal and spindle alterations may occur affecting the oocyte competence. In vitro maturation (IVM) supplementation with different antioxidant molecules has been performed to attenuate this harmful stress. Coenzyme Q10 (CoQ10 ) supplementation has previously shown to have positive effects in bovine and mouse in vitro embryo development. The aim of this study was to evaluate the effects of CoQ10 during bovine oocyte IVM and vitrification...
October 2017: Reproduction in Domestic Animals, Zuchthygiene
https://www.readbyqxmd.com/read/29050247/rnai-mediated-knockdown-of-parp1-does-not-improve-the-development-of-female-cloned-mouse-embryos
#2
Guang-Yu Bai, Si-Hang Song, Rui-Zhen Sun, Zi-Hui Zhang, Jingyu Li, Zhen-Dong Wang, Zhong-Hua Liu, Lei Lei
Somatic cell nuclear transfer is an important technique for life science research, but its efficiency is still extremely low, and most genes that are important during early development, such as X chromosome-linked genes, are not appropriately expressed during this process. Poly (ADP-ribose) polymerase (PARP) is an enzyme that transfers ADP ribose clusters to target proteins. PARP family members such as PARP1 participate in cellular signalling pathways through poly (ADP-ribosylation) (PARylation), which ultimately promotes changes in chromatin structure, gene expression, and the localization and activity of proteins that mediate signalling responses...
September 19, 2017: Oncotarget
https://www.readbyqxmd.com/read/29049922/effect-of-co-culture-canine-cumulus-and-oviduct-cells-with-porcine-oocytes-during-maturation-and-subsequent-embryo-development-of-parthenotes-in%C3%A2-vitro
#3
Seok Hee Lee, Hyun Ju Oh, Min Jung Kim, Geon A Kim, Yoo Bin Choi, Young Kwang Jo, Erif Maha Nugraha Setyawan, Byeong Chun Lee
In the estrus stage, canine oocytes are surrounded by cumulus cells and undergo maturation in the oviduct for 2-3 days after ovulation. We hypothesized that canine oviduct cells (cOC) and canine cumulus cells (cCC) during this stage might affect the maturation of oocytes and thereby improve subsequent embryo development. Therefore, the objective of this study was to compare the effects of a cOC and cCC co-culture on oocyte in vitro maturation (IVM) and subsequent embryo development, and to analyze the gene expressions in a molecular fashion what co-culture actually gives the specific pathways in which the co-culture cells act to improve maturation and embryo development...
October 3, 2017: Theriogenology
https://www.readbyqxmd.com/read/29040878/c-phycocyanin-supplementation-during-in%C3%A2-vitro-maturation-enhances-pre-implantation-developmental-competence-of-parthenogenetic-and-cloned-embryos-in-pigs
#4
Shuang Liang, Jing Guo, Yong Xun Jin, Bao Yuan, Jia-Bao Zhang, Nam-Hyung Kim
C-Phycocyanin (C-PC), a protein from green microalgae, has been suggested to possess various biological activities, including antioxidant and free radical scavenging properties. The aim of the current study was to explore the effects of C-PC on the maturation of porcine oocytes and subsequent developmental competence after parthenogenetic activation and somatic cell nuclear transfer (SCNT) as well as the underlying mechanisms. There was no significant improvement in nuclear maturation rates between the control and C-PC supplementation groups (1, 3, 5, 10 μg/mL)...
September 8, 2017: Theriogenology
https://www.readbyqxmd.com/read/29040039/breast-cancer-risk-associations-with-digital-mammographic-density-by-pixel-brightness-threshold-and-mammographic-system
#5
Tuong L Nguyen, Yoon-Ho Choi, Ye K Aung, Christopher F Evans, Nhut H Trinh, Shuai Li, Gillian S Dite, Myeong-Seong Kim, Patrick C Brennan, Mark A Jenkins, Joohon Sung, Yun-Mi Song, John L Hopper
Purpose To compare three mammographic density measures defined by different pixel intensity thresholds as predictors of breast cancer risk for two different digital mammographic systems. Materials and Methods The Korean Breast Cancer Study included 398 women with invasive breast cancer and 737 control participants matched for age at mammography (±1 year), examination date, mammographic system, and menopausal status. Mammographic density was measured by using the automated Laboratory for Individualized Breast Radiodensity Assessment (LIBRA) software and the semiautomated Cumulus software at the conventional threshold (Cumulus) and at increasingly higher thresholds (Altocumulus and Cirrocumulus, respectively)...
October 16, 2017: Radiology
https://www.readbyqxmd.com/read/29034614/selenium-supplementation-during-in%C3%A2-vitro-maturation-enhances-meiosis-and-developmental-capacity-of-yak-oocytes
#6
Xianrong Xiong, Daoliang Lan, Jian Li, Yaqiu Lin, Mingyang Li
The objectives of the present study were to investigate the effects of selenium (Se) supplementation during in vitro maturation (IVM) on the developmental capacity of yak (Bos grunniens) oocytes. Nuclear maturation, DNA integrity, glutathione peroxidase (GSH-Px) activity, subsequent embryonic development, and gene expression after in vitro fertilization (IVF) were evaluated. The Se concentrations in yak plasma and follicular fluid were 0.142 and 0.069 μg/mL, respectively. The DNA damage in cumulus cells decreased significantly with 2 and 4 μg/mL supplementation of sodium selenite to IVM medium (P < 0...
October 16, 2017: Animal Science Journal, Nihon Chikusan Gakkaihō
https://www.readbyqxmd.com/read/29029246/the-epidermal-growth-factor-network-role-in-oocyte-growth-maturation-and-developmental-competence
#7
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...
September 20, 2017: Human Reproduction Update
https://www.readbyqxmd.com/read/29025042/stage-specific-follicular-extracellular-vesicle-uptake-and-regulation-of-bovine-granulosa-cell-proliferation
#8
Wei-Ting Hung, Raphatphorn Navakanitworakul, Tarique Khan, Pan Zhang John S Davis, Lynda K McGinnis, Lane K Christenson
Follicular fluid within ovarian antral follicles contains numerous factors, which influence the development of a healthy oocyte including nucleic acids, steroids, proteins, and extracellular vesicles (EVs). Current evidence indicates that follicular EVs promote changes in cellular gene expression and support cumulus-oocyte-complex expansion in vitro. In this study, we found EVs from different sized follicles differentially stimulate granulosa cell proliferation and this could be explained by both the differential contents associated, on or within the vesicles and by the preferential uptake of EVs dependent on follicle size from which they were isolated...
August 28, 2017: Biology of Reproduction
https://www.readbyqxmd.com/read/29025011/significance-of-epidermal-growth-factor-receptor-signaling-for-acquisition-of-meiotic-and-developmental-competence-in-mammalian-oocytes
#9
Radek Prochazka, Milan Blaha, Lucie Nemcová
The surge in luteinizing hormone (LH) in preovulatory ovarian follicles triggers the resumption of oocyte meiosis accompanied by expansion of surrounding cumulus cells and ovulation of cumulus-oocyte complexes (COCs) into the oviduct. Over the last 15 years, substantial progress has been made in elucidating the key pathways by which the LH signal spreads within the preovulatory follicle and in identifying the molecules responsible for maintaining oocyte arrest and meiosis resumption. It is now clear that the adenylcyclase-mediated rise in intracellular cAMP leads to activation of the epidermal growth factor receptor (EGFR) network in granulosa and cumulus cells...
August 31, 2017: Biology of Reproduction
https://www.readbyqxmd.com/read/29021901/icsi-diagnostic-a-way-to-prevent-total-fertilization-failure-after-4-unsuccessful-iui
#10
Arnaud Larbuisson, Dominique Raick, Stephanie Demelenne, Annick Delvigne
BACKGROUND: The aim of this retrospective study is to investigate the relevance of dividing oocytes and using some for traditional in vitro fertilization (IVF) and others for intracytoplasmic sperm injection (ICSI) as of the first IVF cycle in patients with unexplained infertility who have undergone 4 intrauterine insemination (IUI) cycles which produced no pregnancies. METHODS: This retrospective study includes patients with unexplained infertility who have failed to become pregnant, after 4 IUI, despite normal semen parameters after sperm capacitation...
2017: Basic and Clinical Andrology
https://www.readbyqxmd.com/read/28993961/predictive-factors-for-live-birth-after-in-vitro-maturation-of-oocytes-in-women-with-polycystic-ovary-syndrome
#11
Samer Tannus, Safak Hatirnaz, Justin Tan, Baris Ata, Seang-Lin Tan, Ebru Hatirnaz, Mine Kenat-Pektas, Michael-Haim Dahan
OBJECTIVE: In vitro maturation (IVM) of human oocytes can be an alternative treatment option to conventional in vitro fertilization. Women with polycystic ovary syndrome (PCOS) are considered the classical candidates for IVM because of the associated ovarian morphology and because IVM diminishes the risk of developing ovarian hyperstimulation syndrome. The objective of this study was to identify predictive factors for live birth in a cohort of women with PCOS who underwent IVM. METHODS: This retrospective study included 159 patients with PCOS who had IVM cycles in which single or double embryo transfer was performed...
October 9, 2017: Archives of Gynecology and Obstetrics
https://www.readbyqxmd.com/read/28988321/apoptotic-biomarkers-in-cumulus-cells-in-relation-to-embryo-quality-in-polycystic-ovary-syndrome
#12
Ensieh Salehi, Reza Aflatoonian, Ashraf Moeini, Nazila Yamini, Ebrahim Asadi, Zahra Khosravizadeh, Masoumeh Dehghan Tarzjani, Zhila Naghibi Harat, Farid Abolhassani
PURPOSE: To investigate associations between gene expression pattern of apoptotic biomarkers in cumulus cells of polycystic ovary syndrome (PCOS) patients and the quality of oocytes and embryos. METHODS: 40 intracytoplasmic sperm injection patients, of whom 20 were PCOS and 20 were healthy women, were included in this study. Serum hormone levels were measured using Radioimmunoassay for each patient. The expression of survivin, caspase-3, and caspase-7 in 200 cumulus complexes surrounding mature oocytes (100 in PCOS versus 100 in control groups) collected individually at pick up was examined by real-time polymerase chain reaction (real-time PCR)...
October 7, 2017: Archives of Gynecology and Obstetrics
https://www.readbyqxmd.com/read/28980231/fertilization-1-sperm-egg-interaction
#13
Shunsuke Nishio, Tsukasa Matsuda
In birds in the reproductive season, an egg is ovulated without cumulus cells from the largest follicle with the highest hierarchy in the ovary. The outermost part of the ovulated eggs is the perivitelline layer, a glycoprotein matrix consisting of a few ZP-glycoproteins. The fertilization starts from sperm penetration of the perivitelline layer predominantly in the germinal disc region, followed by uptake of the sperm into the egg, and goes through by the fusion of sperm male pronucleus with the female pronucleus in the egg...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28978329/macrophage-colony-stimulating-factor-m-csf-is-an-intermediate-in-the-process-of-luteinizing-hormone-induced-decrease-in-natriuretic-peptide-receptor-2-npr2-and-resumption-of-oocyte-meiosis
#14
Wenchao Sun, Chang Liu, Ying Feng, Guangchao Zhuo, Wenjing Zhou, Xiaoyang Fei, Zhifen Zhang
BACKGROUND: Luteinizing hormone (LH) regulation of the ligand, natriuretic peptide precursor type C, and its receptor, natriuretic peptide receptor 2 (NPR2), is critical for oocyte maturation; however, the mechanism is not fully understood. Macrophage colony-stimulating factor (M-CSF) has recently been shown to be involved in oocyte maturation and ovulation. In the present study we determined whether or not M-CSF plays a role in the intermediate signal that mediates LH regulation of NPR2 in resumption of oocyte meiosis...
October 4, 2017: Journal of Ovarian Research
https://www.readbyqxmd.com/read/28977600/alk2-alk3-bmpr2-acvr2a-mediate-bmp2-induced-downregulation-of-pentraxin-3-expression-in-human-granulosa-lutein-cells
#15
Long Bai, Hsun-Ming Chang, Jung-Chien Cheng, Guiyan Chu, Peter C K Leung, Gongshe Yang
Bone morphogenetic protein 2 (BMP2) belongs to the transforming growth factor-β superfamily and plays a critical role in regulating ovarian follicle function. Currently, the role of BMP2 during cumulus expansion remains to be determined. The aim of this study was to investigate the effect of BMP2 on the regulation of pentraxin 3 (PTX3) expression (the major component of cumulus expansion) and the underlying mechanisms in human granulosa-lutein (hGL) cells. Both primary and immortalized hGL cells were used as research models...
October 1, 2017: Endocrinology
https://www.readbyqxmd.com/read/28971897/subcellular-localization-of-ms4a13-isoform-2-in-mouse-spermatozoa
#16
Takane Kaneko, Kiyotaka Toshimori, Hiroshi Iida
To identify up-regulated genes during the development of spermatozoa, we performed PCR-selected subtraction analysis of testes RNA samples from 10-day-old and 12-week-old shrews. A transcript, highly homologous to two mouse transcripts, Ms4a13-1 and Ms4a13-2, was differentially regulated. Ms4a13-2, but not Ms4a13-1, was shown to be primarily expressed in mouse testes in an age-dependent manner. Ms4a13-2 cDNA contains an open reading frame of 522 nucleotides, encoding a protein of 174 amino acids, with predicted molecular mass, 19,345 Da...
October 2, 2017: Reproduction: the Official Journal of the Society for the Study of Fertility
https://www.readbyqxmd.com/read/28971896/in-vitro-maturation-impacts-cumulus-oocyte-complex-metabolism-and-stress-in-cattle
#17
Maite Del Collado, Juliano Coelho da Silveira, Marcelo Luna Freire Oliveira, Barbara Monteiro da Silva Marques Alves, Rosineide Costa Simas, Adriana Teixeira Godoy, Mirela Batista Coelho, Lygia Azevedo Marques, Mateus Maldonado Carriero, Marcelo Fábio Gouveia Nogueira, Marcos Nogueira Eberlin, Luciano A Silva, Flávio Vieira Meirelles, Felipe Perecin
The influence of in vitro maturation (IVM) in oocytes is still not totally understood. The aim of this study was to determine the influence of IVM on the metabolism and homeostasis of bovine cumulus-oocyte complexes. In the present study, we demonstrated that IVM leads to accumulation of neutral lipids associated with differential levels of the mono-, di-, and tri-acylglycerols in both cumulus cells and oocytes. We observed that in vitro-matured oocytes exhibited decreased glutathione and reactive oxygen species levels and a lower ATP/ADP ratio when compared to in vivo-matured oocytes, with no significant differences in metabolism and stress related mRNA or miRNA levels...
October 2, 2017: Reproduction: the Official Journal of the Society for the Study of Fertility
https://www.readbyqxmd.com/read/28971892/production-of-cloned-mice-using-oocytes-derived-from-icr-outbred-strain
#18
Yoshiaki Tanabe, Hiroki Kuwayama, Sayaka Wakayama, Hiroaki Nagatomo, Masatoshi Ooga, Satoshi Kamimura, Satoshi Kishigami, Teruhiko Wakayama
Recently, it has become possible to generate cloned mice using a somatic cell nucleus derived from not only F1 strains but also inbred strains. However, to date, all cloned mice have been generated using F1 mouse oocytes as the recipient cytoplasm. Here, we attempted to generate cloned mice from oocytes derived from the ICR outbred mouse strain. Cumulus cell nuclei derived from BDF1 and ICR mouse strains were injected into enucleated oocytes of both strains to create four groups. Subsequently, the quality and developmental potential of the cloned embryos were examined...
October 2, 2017: Reproduction: the Official Journal of the Society for the Study of Fertility
https://www.readbyqxmd.com/read/28962017/treatment-with-aicar-inhibits-blastocyst-development-trophectoderm-differentiation-and-tight-junction-formation-and-function-in-mice
#19
Michele D Calder, Nicole A Edwards, Dean H Betts, Andrew J Watson
STUDY QUESTION: What is the impact of adenosine monophosphate-activated protein kinase (AMPK) activation on blastocyst formation, gene expression, and tight junction formation and function? SUMMARY ANSWER: AMPK activity must be tightly controlled for normal preimplantation development and blastocyst formation to occur. WHAT IS KNOWN ALREADY: AMPK isoforms are detectable in oocytes, cumulus cells and preimplantation embryos. Cultured embryos are subject to many stresses that can activate AMPK...
September 13, 2017: Molecular Human Reproduction
https://www.readbyqxmd.com/read/28951153/susceptibility-of-human-cumulus-cells-to-bisphenol-a-in-vitro
#20
Abdallah Mansur, Michal Adir, Catherine Racowsky, Catherine Mh Combelles, Natalie Landa, Ronit Machtinger
Bisphenol A (BPA) is detectable in follicular fluid. However, the effect of BPA exposure on human cumulus cells (CC) that surround the oocyte and are crucial for oocyte competence has been largely unexplored. We exposed primary cultures of CC to increasing concentrations of BPA [0,0.002, 0.02 and 20μg/mL] and tested the effects of BPA on the expression of genes associated with apoptosis using quantitative reverse-transcriptase polymerase chain reaction (qRT-PCR); we also assessed the effect of BPA on apoptosis by staining with anti-caspase 3...
September 22, 2017: Reproductive Toxicology
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