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https://www.readbyqxmd.com/read/28099474/dna-double-strand-breaks-induce-the-nuclear-actin-filaments-formation-in-cumulus-enclosed-oocytes-but-not-in-denuded-oocytes
#1
Ming-Hong Sun, Mo Yang, Feng-Yun Xie, Wei Wang, Lili Zhang, Wei Shen, Shen Yin, Jun-Yu Ma
As a gamete, oocyte needs to maintain its genomic integrity and passes this haploid genome to the next generation. However, fully-grown mouse oocyte cannot respond to DNA double-strand breaks (DSBs) effectively and it is also unable to repair them before the meiosis resumption. To compensate for this disadvantage and control the DNA repair events, oocyte needs the cooperation with its surrounding cumulus cells. Recently, evidences have shown that nuclear actin filament formation plays roles in cellular DNA DSB repair...
2017: PloS One
https://www.readbyqxmd.com/read/28093199/effect-of-different-cryo-devices-on-in-vitro-maturation-and-development-of-vitrified-warmed-immature-buffalo-oocytes
#2
Yelisetti Uma Mahesh, Henderson Rose Winnie Gibence, Sisinthy Shivaji, Brahmasani Sambasiva Rao
The aim of the study was to identify a cryo-device that would be best suited for the vitrification of buffalo immature cumulus-oocyte complexes (COCs) as judged by viability and meiotic competence of the vitrified-warmed oocytes and their development ability following in vitro fertilization (IVF). The expression of oocyte secreting factors and their receptors (GDF9, BMP15, BMPR2, TGFBR1) and apoptosis related genes (BCL2, BAX, P53, C-MYC) were compared in vitrified-warmed oocytes after in vitro maturation. COCs from the ovaries of slaughtered buffaloes were vitrified in a combination of dimethyl sulfoxide, ethylene glycol, and sucrose using either a conventional straw (CS), open pulled straw (OPS), cryoloop (CL), hemistraw (HS) or cryotop (CT)...
January 13, 2017: Cryobiology
https://www.readbyqxmd.com/read/28089824/mitochondrial-uncoupling-protein-2-in-human-cumulus-cells-is-associated-with-regulating-autophagy-and-apoptosis-maintaining-gap-junction-integrity-and-progesterone-synthesis
#3
Hongshan Ge, Fan Zhang, Duan Ping, Nan Zhu, Jiayan Zhang, Feijun Ye, Dan Shan, Hua Chen, XiaoSheng Lu, ChunFang Zhu, Renshan Ge, Zhenkun Lin
To explore the roles of mitochondrial Uncoupling Protein 2 (UCP2) in cumulus cells (CCs), human CCs were cultured in vitro, and the UCP2 was inhibited by treatment with Genipin, a special UCP inhibitor, or by RNA interference targeting UCP2. No significant differences in adenosine triphosphate levels and the ratio of ADP/ATP were observed after UCP2 inhibition. UCP2 inhibition caused a significant increase in cellular oxidative damage, which was reflected in alterations to several key parameters, including reactive oxygen species (ROS) and lipid peroxidation levels and the ratio of reduced GSH to GSSG...
January 12, 2017: Molecular and Cellular Endocrinology
https://www.readbyqxmd.com/read/28087314/a-protective-role-of-cumulus-cells-after-short-term-exposure-of-rat-cumulus-cell-oocyte-complexes-to-lifestyle-or-environmental-contaminants
#4
Kelly A Campen, Kenneth P McNatty, Janet L Pitman
Ovarian follicular fluid provides a potential reservoir for exogenous compounds that may adversely affect oocyte quality. This study examined the effects of common lifestyle and environmental contaminants, namely bisphenol-A (BPA), caffeine, 3,4-methylenedioxymethamphetamine (MDMA), nicotine and Δ(9)-tetrahydrocannabinol on gap junction genes (Gja1, Gja4) and proteins (GJA1), glucose metabolism genes (Gfpt1, Pfkp) and oocyte growth factor genes (Bmp15, Gdf9), as well as gap junction transfer rate, in rat cumulus-oocyte complexes (COCs)...
January 10, 2017: Reproductive Toxicology
https://www.readbyqxmd.com/read/28078843/association-between-expression-of-cumulus-expansion-markers-and-real-time-proliferation-of-porcine-follicular-granulosa-cells-in-a-primary-cell-culture-model
#5
S Ciesiółka, J Budna, A Bryja, W Kranc, A Chachuła, M Dyszkiewicz-Konwińska, H Piotrowska, D Bukowska, P Antosik, M Bruska, K P Brüssow, M Nowicki, M Zabel, B Kempisty
Folliculogenesis is a compound process that involves both ovarian follicle growth and oocyte development, which is tightly attached to the follicular wall. During this process, cells that form the follicle structure undergo substantial morphological and molecular modifications that finally lead to differentiation and specialization of ovarian follicular cells. The differentiation of ovarian cells encompasses formation of follicle, which is composed of theca (TCs), mural granulosa (GCs), and cumulus cells (CCs)...
October 2016: Journal of Biological Regulators and Homeostatic Agents
https://www.readbyqxmd.com/read/28077604/the-mitochondrial-dna-content-of-cumulus-granulosa-cells-is-linked-to-embryo-quality
#6
V Desquiret-Dumas, A Clément, V Seegers, L Boucret, V Ferré-L'Hotellier, P E Bouet, P Descamps, V Procaccio, P Reynier, P May-Panloup
STUDY QUESTION: Could the mitochondrial DNA (mtDNA) content of cumulus granulosa cells (CGCs) be related to oocyte competence? SUMMARY ANSWER: The quality of embryos obtained during IVF procedures appears to be linked to mtDNA copy numbers in the CGCs. WHAT IS KNOWN ALREADY: Oocyte quality is linked to oocyte mtDNA content in the human and other species, and the mtDNA copy number of the oocyte is related to that of the corresponding CGCs. Moreover, the quantification of CGC mtDNA has recently been proposed as a biomarker of embryo viability...
January 6, 2017: Human Reproduction
https://www.readbyqxmd.com/read/28069092/reduced-competence-of-immature-and-mature-oocytes-vitrified-by-cryotop-method-assessment-by-in-vitro-fertilization-and-parthenogenetic-activation-in-a-bovine-model
#7
Daiane L Bulgarelli, Alessandra A Vireque, Caroline P Pitangui-Molina, Marcos F Silva-de-Sá, Ana Carolina J de Sá Rosa-E-Silva
This study aimed to evaluate the embryo development competence, the nuclear maturation and the viability of germinal vesicle (GV) and metaphase II (MII) oocytes vitrified by the Cryotop method. Cumulus-oocyte complexes were derived from bovine ovaries and three experiments were conducted. In Experiment 1, GV oocytes were vitrified and underwent in vitro maturation (IVM) or not and their nuclear maturation was assessed by orcein staining. In Experiment 2, GV oocytes and MII oocytes were vitrified or not and the viability was assessed by calcein/ethidium homodimer-1 staining...
January 10, 2017: Zygote: the Biology of Gametes and Early Embryos
https://www.readbyqxmd.com/read/28063736/brilliant-cresyl-blue-staining-does-not-present-cytotoxic-effects-on-human-luteinized-follicular-cells-according-to-gene-protein-expression-as-well-as-to-cytotoxicity-tests
#8
Diego Duarte Alcoba, Júlia Schneider, Letícia Arruda, Patrícia Borba Martiny, Edison Capp, Helena von Eye Corleta, Ilma Simoni Brum
In vitro oocyte maturation presents many advantages and its success is related to the selection of fully grown oocytes. In animal models, staining of cumulus-oocyte complexes (COCs) with Brilliant Cresyl Blue (BCB) is widely used for this selection. However, a lack of information about the safety of BCB makes its applicability in humans questionable. Because granulosa and cumulus cells have a close relationship with the oocyte and taking into account that follicular cells are also exposed to BCB when this pre-selection method is applied, we aimed to evaluate the effects of BCB on human follicular cells exposed to BCB...
January 4, 2017: Reproductive Biology
https://www.readbyqxmd.com/read/28062399/longitudinal-study-of-mammographic-density-measures-that-predict-breast-cancer-risk
#9
Kavitha Krishnan, Laura Baglietto, Jennifer Stone, Julie A Simpson, Gianluca Severi, Christopher Evans, Robert J MacInnis, Graham G Giles, Carmel Apicella, John L Hopper
BACKGROUND: After adjusting for age and body mass index (BMI), mammographic measures - dense area (DA), percent dense area (PDA) and non-dense area (NDA) - are associated with breast cancer risk. Our aim was to use longitudinal data to estimate the extent to which these risk-predicting measures track over time. METHODS: We collected 4,320 mammograms (age range, 24-83 years) from 970 women in the Melbourne Collaborative Cohort Study and the Australian Breast Cancer Family Registry...
January 6, 2017: Cancer Epidemiology, Biomarkers & Prevention
https://www.readbyqxmd.com/read/28054671/natriuretic-peptide-type-c-induces-sperm-attraction-for-fertilization-in-mouse
#10
Nana Kong, Xiaoting Xu, Yu Zhang, Yakun Wang, Xiaoqiong Hao, Yu Zhao, Jie Qiao, Guoliang Xia, Meijia Zhang
Mammalian spermatozoa undergo selective movement along the isthmus of the oviduct to the ampulla during ovulation, which is a prerequisite for fertilization. The factor(s) that involves in selective spermatozoa movement is still unknown. In this study, we found that the oviductal epithelium in mouse ampulla expressed high levels of natriuretic peptide type C (NPPC) in the presence of ovulated oocyte-cumulus complexes (OCCs). Spermatozoa expressed NPPC receptor natriuretic peptide receptor 2 (NPR2, a guanylyl cyclase) on the midpiece of flagellum...
January 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28051267/reduced-expression-of-scf-in-serum-and-follicle-from-patients-with-polycystic-ovary-syndrome
#11
J Tan, X-Y Wen, Q Su, Z-H Huang, J-X He, C-L Xin, Q-F Wu, Y Zou
OBJECTIVE: In humans, stem cell factor (SCF), produced by cumulus granulosa cells during the follicular phase, plays a crucial role in follicular development. Remarkably, polycystic ovary syndrome (PCOS), one of the main reasons affecting women fertility, is accompanied by some abnormal follicles. Is there a relationship between SCF and PCOS? This study aimed to compare the expression of SCF in follicle and serum from patients with and without PCOS undergoing in vitro fertilization (IVF) treatment and to investigate the potential relationship between aberrant SCF expression and PCOS...
December 2016: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/28043356/anethole-improves-the-in%C3%A2-vitro-development-of-isolated-caprine-secondary-follicles
#12
N A R Sá, V R Araújo, H H V Correia, A C A Ferreira, D D Guerreiro, A M Sampaio, E Escobar, F W Santos, A A Moura, C H Lôbo, V M Ceccatto, C C Campello, A P R Rodrigues, J H Leal-Cardoso, J R Figueiredo
The aim of this study was to investigate the effect of three concentrations of anethole (30, 300, and 2000 μg/mL) on survival, antrum formation, follicular diameter, and oocyte maturation in the caprine species. The study also evaluated the effects of anethole on transcripts of ICAM-1, CAV-1, TIMP-2, and PAI-1 genes and levels of reactive oxygen species (ROS) in isolated goat preantral ovarian follicles before and after in vitro culture for 18 days. Preantral follicles were isolated from goat ovaries and individually cultured in alpha minimum essential medium modified (α-MEM(+)), defined as the control treatment, α-MEM(+) supplemented with ascorbic acid at a concentration of 100 μg/mL (AA), or α-MEM(+) supplemented with three different concentrations of anethole (30, 300, 2000 μg/mL) for a period of 18 days...
February 2017: Theriogenology
https://www.readbyqxmd.com/read/28043342/in%C3%A2-vitro-embryo-production-in-wood-bison-bison-bison-athabascae-using-in%C3%A2-vivo-matured-cumulus-oocyte-complexes
#13
Miriam P Cervantes, J Manuel Palomino, Muhammad Anzar, Reuben J Mapletoft, Gabriela F Mastromonaco, Gregg P Adams
Experiments were conducted in wood bison to determine the effect of additional maturation time on embryo development of in vivo matured oocytes. In experiment 1, cumulus-oocyte complexes (COC) were collected 30 hours after hCG treatment in superstimulated wood bison, and expanded COC were fertilized immediately or after 4 hours of additional in vitro maturation. Embryo development was assessed on Days 3, 7, and 8 (Day 0 = day of fertilization). No difference in cleavage rate was detected (55.3% vs. 60...
February 2017: Theriogenology
https://www.readbyqxmd.com/read/28039065/microrna-224-delays-oocyte-maturation-through-targeting-ptx3-in-cumulus-cells
#14
Xiufang Li, Huidan Wang, Yan Sheng, Zhongqing Wang
MicroRNAs (miRNAs) have been improved to regulate oocyte development in a cell- or stage-specific manner. In this study, we aimed to clarify microRNA-224's (miR-224) role in cumulus cells (CCs), to find out whether a change level of miR-224 in CCs could influence the maturation of oocyte. We found that overexpression of miR-224 of CCs led to the impairment of cell expansion, along with a decrease in the gene expression associated with cell expansion and maturation of oocyte. The increased expression of miR-224 in CC interrupted oocyte cell cycle at the GV stage...
December 28, 2016: Mechanisms of Development
https://www.readbyqxmd.com/read/28029191/beauty-in-the-breakdown-morphology-of-the-first-polar-body-in-mature-mouse-eggs
#15
Allison R Grover, Dana Kimelman, Megan A Runge, Francesca E Duncan
In vitro maturation (IVM) is the process whereby oocytes arrested in prophase of meiosis I are stimulated to resume meiosis and progress to metaphase of meiosis II (MII) ex vivo. Here we examined the cytoskeletal morphology of mature MII eggs obtained following IVM. Cumulus oocyte complexes were isolated from antral follicles of hyper-stimulated female mice, and cumulus cells were removed to induce spontaneous oocyte meiotic maturation. This article is protected by copyright. All rights reserved.
December 28, 2016: Molecular Reproduction and Development
https://www.readbyqxmd.com/read/28007046/maternal-effect-gene-expression-in-porcine-metaphase-ii-oocytes-and-embryos-in-vitro-effect-of-epidermal-growth-factor-interleukin-1%C3%AE-and-leukemia-inhibitory-factor
#16
Marta Wasielak, Teresa Więsak, Iwona Bogacka, Beenu Moza Jalali, Marek Bogacki
Maternal effect genes (MEG) play a crucial role in early embryogenesis. In vitro culture conditions may affect MEG expression in porcine oocytes and embryos. We investigated whether in vitro culture medium supplementation with epidermal growth factor (EGF), IL-1β or LIF (leukemia inhibitory factor) affects the mRNA level of ZAR-1 (zygote arrest 1), NPM2 (nucleoplasmin 2) and DPPA3 (developmental associated protein 3) in porcine MII oocytes and embryos. Cumulus-oocyte complexes (COCs) were matured in NCSU-37 medium (control) or in NCSU-37 with EGF 10 ng/ml, IL-1β 10 ng/ml or LIF 50 ng/ml...
December 23, 2016: Zygote: the Biology of Gametes and Early Embryos
https://www.readbyqxmd.com/read/28004769/single-cell-analysis-of-differences-in-transcriptomic-profiles-of-oocytes-and-cumulus-cells-at-gv-mi-mii-stages-from-pcos-patients
#17
Qiwei Liu, Yumei Li, Yun Feng, Chaojie Liu, Jieliang Ma, Yifei Li, Huifen Xiang, Yazhong Ji, Yunxia Cao, Xiaowen Tong, Zhigang Xue
Polycystic ovary syndrome (PCOS) is a common frequent endocrine disorder among women of reproductive age. Although assisted reproductive techniques (ARTs) are used to address subfertility in PCOS women, their effectiveness is not clear. Our aim was to compare transcriptomic profiles of oocytes and cumulus cells (CCs) between women with and without PCOS, and assess the effectiveness of ARTs in treating PCOS patients. We collected oocytes and CCs from 16 patients with and without PCOS patients to categorize them into 6 groups according to oocyte nuclear maturation...
December 22, 2016: Scientific Reports
https://www.readbyqxmd.com/read/28000057/bovine-in-vitro-embryo-production-the-effects-of-fibroblast-growth-factor-10-fgf10
#18
Mateus Nunes Diógenes, Ana Luiza Silva Guimarães, Ligiane Oliveira Leme, Margot Alves Nunes Dode
PURPOSE: In an attempt to improve in vitro embryo production, we investigated the effect of fibroblast growth factor 10 (FGF10) during in vitro maturation on the developmental capacity of bovine oocytes. MATERIAL AND METHODS: Cumulus-oocyte complexes (COCs) were aspirated from follicles of 3-8 mm diameter. After selection, the COCs were matured in medium with or without 0.5 ng/mL of FGF10. The effect of FGF10 during in vitro maturation (IVM) on nuclear maturation kinetics and expansion of the cumulus cells was investigated...
December 20, 2016: Journal of Assisted Reproduction and Genetics
https://www.readbyqxmd.com/read/27997591/the-role-of-glucose-metabolism-on-porcine-oocyte-cytoplasmic-maturation-and-its-possible-mechanisms
#19
Bao Yuan, Shuang Liang, Jeong-Woo Kwon, Yong-Xun Jin, Shun-Ha Park, Hai-Yang Wang, Tian-Yi Sun, Jia-Bao Zhang, Nam-Hyung Kim
In the present study, we investigated the potential role of glucose and pyruvate in the cytoplasmic maturation of porcine oocytes by investigating the effect of glucose and/or pyruvate supplementation, in the presence or absence of 10% porcine follicular fluid (PFF), on meiotic maturation and subsequent embryo development. In the absence of 10% PFF, without exogenous addition of glucose and pyruvate, the medium seemed unable to support maturation. In the presence of 10% PFF, the addition of 5.6 mM glucose and/or 2 mM pyruvate during in vitro maturation of cumulus enclosed oocytes increased MII oocyte and blastocyst rates...
2016: PloS One
https://www.readbyqxmd.com/read/27997581/identification-of-polycystic-ovary-syndrome-pcos-specific-genes-in-cumulus-and-mural-granulosa-cells
#20
Alp Aydos, Aykut Gurel, Yasemin Oztemur Islakoglu, Senem Noyan, Bagdagul Gokce, Tolga Ecemis, Cemil Kaya, Arif Tarik Aksu, Bala Gur Dedeoglu
Polycystic ovary syndrome (PCOS) is a metabolic and endocrine disorder which affects women of reproductive age with prevalence of 8-18%. The oocyte within the follicle is surrounded by cumulus cells (CCs), which connect with mural granulosa cells (MGCs) that are responsible for secreting steroid hormones. The main aim of this study is comparing gene expression profiles of MGCs and CCs in PCOS and control samples to identify PCOS-specific differentially expressed genes (DEGs). In this study, two microarray databases were searched for mRNA expression microarray studies performed with CCs and MGCs obtained from PCOS patients and control samples...
2016: PloS One
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