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https://www.readbyqxmd.com/read/28445838/addition-of-insulin-like-growth-factor-i-to-the-maturation-medium-of-bovine-oocytes-subjected-to-heat-shock-effects-on-the-production-of-reactive-oxygen-species-mitochondrial-activity-and-oocyte-competence
#1
I J Ascari, N G Alves, J Jasmin, R R Lima, C C R Quintão, G Oberlender, E A Moraes, L S A Camargo
This study was performed to investigate the effects of insulin-like growth factor-I (IGF-I) addition to in vitro maturation (IVM) medium on apoptosis, mitochondrial membrane potential, ROS production, and developmental competence of bovine oocytes subjected to heat shock. Two temperatures (conventional: 24 h at 38.5°C, or heat shock: 12 h at 41°C followed by 12 h at 38.5°C) and 3 IGF-I concentrations (0, 25, and 100 ng/mL) were tested during IVM. The oocytes were then fertilized in vitro, and the presumptive zygotes were cultured until reaching the blastocyst stage...
March 25, 2017: Domestic Animal Endocrinology
https://www.readbyqxmd.com/read/28444612/wbp2nl-pawp-mrna-and-protein-expression-in-sperm-cells-are-not-related-to-semen-parameters-fertilization-rate-or-reproductive-outcome
#2
T Freour, M Barragan, A Ferrer-Vaquer, A Rodríguez, Rita Vassena
PURPOSE: WBP2NL/PAWP, a protein found in the post-acrosomal region of mammalian spermatozoa, has been proposed as a sperm-borne oocyte-activating factor (SOAF) contributing to Ca(2+) release within the oocyte and subsequent fertilization and embryo development. However, its relevance as either a diagnostic or a prognostic marker of fertilization failure has been questioned in the recent literature. We analyzed WBP2NL/PAWP gene and protein expression level and localization in patients without previous intracytoplasmic sperm injection (ICSI) cycles in order to assess its association with both sperm characteristics and ability to fertilize...
March 21, 2017: Journal of Assisted Reproduction and Genetics
https://www.readbyqxmd.com/read/28444134/characterization-of-foxo1-3-and-4-transcription-factors-in-ovaries-of-fetal-prepubertal-and-adult-rhesus-macaques
#3
Alison Y Ting, Mary B Zelinski
The phosphoinositide 3-kinase/AKT signaling pathway negatively regulates follicle activation via the forkhead box O (FOXO) transcription factor in rodents. FOXO3 knockout mice exhibit global activation of primordial follicles leading to early depletion of ovarian follicles and subsequent infertility. Whether a similar mechanism for follicle activation exists in the primate ovary is unclear. In the current study, protein localization of FOXO1, 3 and 4 as well as their upstream regulator, AKT/p-AKT, were examined in rhesus macaque ovaries of 3 developmental stages: fetal, prepubertal and adult...
April 22, 2017: Biology of Reproduction
https://www.readbyqxmd.com/read/28442784/the-rna-binding-protein-marf1-promotes-cortical-neurogenesis-through-its-rnase-activity-domain
#4
Yoshitaka Kanemitsu, Masashi Fujitani, Yuki Fujita, Suxiang Zhang, You-Qiang Su, Yukio Kawahara, Toshihide Yamashita
Cortical neurogenesis is a fundamental process of brain development that is spatiotemporally regulated by both intrinsic and extrinsic cues. Although recent evidence has highlighted the significance of transcription factors in cortical neurogenesis, little is known regarding the role of RNA-binding proteins (RBPs) in the post-transcriptional regulation of cortical neurogenesis. Here, we report that meiosis arrest female 1 (MARF1) is an RBP that is expressed during neuronal differentiation. Cortical neurons expressed the somatic form of MARF1 (sMARF1) but not the oocyte form (oMARF1)...
April 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28442042/growth-arrest-specific-1-gas1-and-glial-cell-line-derived-neurotrophic-factor-receptor-%C3%AE-1-gfr%C3%AE-1-two-mouse-oocyte-glycosylphosphatidylinositol-anchored-proteins-are-involved-in-fertilisation
#5
M Agopiantz, L Xandre-Rodriguez, B Jin, G Urbistondoy, C Ialy-Radio, M Chalbi, J-P Wolf, A Ziyyat, B Lefèvre
Recently, Juno, the oocyte receptor for Izumo1, a male immunoglobulin, was discovered. Juno is an essential glycosylphosphatidylinositol (GIP)-anchored protein. This result did not exclude the participation of other GIP-anchored proteins in this process. After bibliographic and database searches we selected five GIP-anchored proteins (Cpm, Ephrin-A4, Gas1, Gfra1 and Rgmb) as potential oocyte candidates participating in fertilisation. Western blot and immunofluorescence analyses showed that only three were present on the mouse ovulated oocyte membrane and, of these, only two were clearly involved in the fertilisation process, namely growth arrest specific 1 (Gas1) and glial cell line-derived neurotrophic factor receptor α1 (Gfrα1)...
April 2017: Reproduction, Fertility, and Development
https://www.readbyqxmd.com/read/28441662/buffalo-leukemia-inhibitory-factor-induces-differentiation-and-dome-like-secondary-structures-in-cos-1-cells
#6
Gurjeet Kaur, Syed Azmal Ali, Shikha Pachauri, Dhruba Malakar, Jai K Kaushik, Ashok K Mohanty, Sudarshan Kumar
This study aimed to understand the molecular characteristics of buffalo leukemia inhibitory factor (BuLIF) and the generation of a stably transfected COS-1_BuLIF cell line for its functional characterization. Cumulus cells, isolated from oocytes, were separated, and total cDNA was prepared. The BuLIF gene was ligated into the cloning vector pJET1.2/blunt and expression vector pAcGFP-N1 which was transfected into COS-1 cells and confirmed by qRT-PCR and Western blot. BuLIF was immunoprecipitated and evaluated through a MTT assay...
April 26, 2017: Cytogenetic and Genome Research
https://www.readbyqxmd.com/read/28439046/protein-phosphatase-2a-regulatory-subunit-b55%C3%AE-functions-in-mouse-oocyte-maturation-and-early-embryonic-development
#7
Shuang Liang, Jing Guo, Jeong-Woo Choi, Kyung-Tae Shin, Hai-Yang Wang, Yu-Jin Jo, Nam-Hyung Kim, Xiang-Shun Cui
Protein phosphatase 2A regulatory subunit B55α (PP2A-B55α) has been studied in mitosis. However, its functions in mammalian meiosis and early embryonic development remain unknown. Here, we report that PP2A-B55α is critical for mouse oocyte meiosis and preimplantation embryo development. Knockdown of PP2A-B55α in oocytes led to abnormal asymmetric division, disordered spindle dynamics, defects in chromosome congression, an increase in aneuploidy, and induction of the DNA damage response. Moreover, knockdown of PP2A-B55α in fertilized mouse zygotes impaired development to the blastocyst stage...
March 6, 2017: Oncotarget
https://www.readbyqxmd.com/read/28432599/the-beneficial-effect-of-repaglinide-on-in-vitro-maturation-and-development-ability-of-immature-mouse-oocytes
#8
Eshrat Kalehoei, Mehri Azadbakht
Repaglinide is a hypoglycemic drug, causing depolarization of the cell membrane, opening the voltage-gated calcium channels, and then increasing intracellular calcium in the pancreatic B cells by inhibition of the K-ATP-sensitive channels. Oocyte in vitro maturation (IVM) is influenced by different factors such as calcium signaling. In this study, we examined the effects of repaglinide on in vitro maturation and fertilization ability of mouse oocyte. Immature oocytes were isolated from female Naval Medical Research Institute mice which are 6-8 wk old mechanically and then cultured in 30 μl droplets of T6 medium with different concentrations of repaglinide...
April 21, 2017: In Vitro Cellular & Developmental Biology. Animal
https://www.readbyqxmd.com/read/28431246/fatty-acids-regulate-germline-sex-determination-through-acs-4-dependent-myristoylation
#9
Hongyun Tang, Min Han
Fat metabolism has been linked to fertility and reproductive adaptation in animals and humans, and environmental sex determination potentially plays a role in the process. To investigate the impact of fatty acids (FA) on sex determination and reproductive development, we examined and observed an impact of FA synthesis and mobilization by lipolysis in somatic tissues on oocyte fate in Caenorhabditis elegans. The subsequent genetic analysis identified ACS-4, an acyl-CoA synthetase and its FA-CoA product, as key germline factors that mediate the role of FA in promoting oocyte fate through protein myristoylation...
April 20, 2017: Cell
https://www.readbyqxmd.com/read/28428123/transvaginal-ultrasound-guided-embryo-transfer-in-ivf
#10
Lionel Larue, Gwenola Keromnes, Anne Massari, Clémence Roche, Julie Moulin, Héloïse Gronier, Dominique Bouret, Nino Guy Cassuto, Jean Philippe Ayel
OBJECTIVES: to determine whether transvaginal ultrasound-guided embryo transfer is a technique that can be used routinely, whether it improves IVF outcomes and whether it makes difficult transfers easier and more successful. MATERIAL AND METHOD: non-randomised retrospective study conducted between 2012 and 2016 in the Fertility Centre of the Diaconesses-Croix St Simon Hospital Group. The outcomes of 3910 transfers performed by 5 senior operators under transabdominal ultrasound guidance are compared with those of 800 transfers performed by 1 senior operator under transvaginal ultrasound guidance...
April 17, 2017: J Gynecol Obstet Hum Reprod
https://www.readbyqxmd.com/read/28423577/the-cyclin-like-protein-spy1-regulates-the-er%C3%AE-and-erk1-2-pathways-promoting-tamoxifen-resistance
#11
Rosa-Maria Ferraiuolo, Janice Tubman, Indrajit Sinha, Caroline Hamm, Lisa Ann Porter
The Ras/Raf/MEK/ERK pathway conveys growth factor and mitogen signalling to control the phosphorylation of a plethora of substrates regulating proliferation, survival, and migration. The Ras signalling pathway is frequently associated with poor prognosis and drug resistance in various cancers including those of the blood, breast and prostate. Activation of the downstream effector ERK does not always occur via a linear cascade of events; complicating the targeting of this pathway therapeutically. This work describes a novel positive feedback loop where the cell cycle regulatory factor Spy1 (RINGO; gene SPDYA) activates ERK1/2 in a MEK-independent fashion...
April 4, 2017: Oncotarget
https://www.readbyqxmd.com/read/28422964/effect-of-women-s-age-on-embryo-morphology-cleavage-rate-and-competence-a-multicenter-cohort-study
#12
MULTICENTER STUDY
Marie Louise Grøndahl, Sofie Lindgren Christiansen, Ulrik Schiøler Kesmodel, Inge Errebo Agerholm, Josephine Gabriela Lemmen, Peter Lundstrøm, Jeanette Bogstad, Morten Raaschou-Jensen, Steen Ladelund
This multicenter cohort study on embryo assessment and outcome data from 11,744 IVF/ICSI cycles with 104,830 oocytes and 42,074 embryos, presents the effect of women's age on oocyte, zygote, embryo morphology and cleavage parameters, as well as cycle outcome measures corrected for confounding factors as center, partner's age and referral diagnosis. Cycle outcome data confirmed the well-known effect of women's age. Oocyte nuclear maturation and proportion of 2 pro-nuclear (2PN) zygotes were not affected by age, while a significant increase in 3PN zygotes was observed in both IVF and ICSI (p<0...
2017: PloS One
https://www.readbyqxmd.com/read/28421902/the-role-of-ovarian-reserve-markers-in-prediction-of-clinical-pregnancy
#13
Ali G Zebitay, Orkun Cetin, Fatma F Verit, Seda Keskin, M Nafi Sakar, Sercin Karahuseyinoglu, Gulsah Ilhan, Sezai Sahmay
To evaluate the role of ovarian reserve markers in the prediction of clinical pregnancy and embryo transfer accomplishment among poor responder IVF applicants. 304 female poor responder IVF applicants were included in this prospective cohort study conducted at the IVF-unit. Antral follicle count, FSH, LH, E2, AMH and IVF outcomes were compared in pregnant and non-pregnant groups as well as in ET vs. non-ET groups. The number of retrieved oocytes was significantly correlated positively with AMH and AFC, and negatively with FSH and age...
May 2017: Journal of Obstetrics and Gynaecology: the Journal of the Institute of Obstetrics and Gynaecology
https://www.readbyqxmd.com/read/28420503/age-is-a-major-prognosticator-in-extremely-low-oocyte-retrieval-cycles
#14
Yu-Ting Su, Pin-Yao Lin, Fu-Jen Huang, Fu-Tsai Kung, Yu-Ju Lin, Yi-Ru Tsai, Kuo-Chung Lan
OBJECTIVE: Clinical prognosis appears to be varied in females with poor ovarian response (POR), and poor responders defined by the Bologna criteria might not be sufficiently homogeneous. The aim of this study was to determine the major predictor of reproductive outcomes in extremely low oocyte retrieval cycles. MATERIALS AND METHODS: A cohort of fresh in vitro fertilization/intracytoplasmic sperm injection cycles (n = 858) was analyzed from January 2001 to September 2014...
April 2017: Taiwanese Journal of Obstetrics & Gynecology
https://www.readbyqxmd.com/read/28419910/endometriosis-doubles-odds-for-miscarriage-in-patients-undergoing-ivf-or-icsi
#15
Corinna Pallacks, Jens Hirchenhain, Jan-Steffen Krüssel, Tanja N Fehm, Daniel Fehr
OBJECTIVE: To identify and estimate the importance of risk factors on pregnancy loss until the end of the second trimester after clinical pregnancy was achieved by either in vitro fertilisation (IVF) or intra-cytoplasmic sperm injection (ICSI). STUDY DESIGN: Retrospective cohort study including 588 cycles with fresh embryo transfers and 150 cycles with frozen-thawed embryo transfers using logistic regression. RESULTS: The rate of miscarriages subsequent to a fresh embryo transfer was significantly increased by a diagnosis of endometriosis (p=0...
April 5, 2017: European Journal of Obstetrics, Gynecology, and Reproductive Biology
https://www.readbyqxmd.com/read/28418847/quercetin-delays-postovulatory-aging-of-mouse-oocytes-by-regulating-sirt-expression-and-mpf-activity
#16
HaiYang Wang, Yu-Jin Jo, Jeong Su Oh, Nam-Hyung Kim
If no fertilization occurs at an appropriate time after ovulation, oocyte quality deteriorates rapidly as a process called postovulatory aging. Because the postovulatory aging of oocytes has detrimental effects on embryo development and offspring, many efforts have been made to prevent oocyte aging. Here we showed that quercetin prevented the decline in oocyte quality during postovulatory aging of oocytes. Quercetin treatment reduced aging-induced morphological changes and reactive oxygen species accumulation...
March 15, 2017: Oncotarget
https://www.readbyqxmd.com/read/28414979/role-of-egf-on-in-situ-culture-of-equine-preantral-follicles-and-metabolomics-profile
#17
F L N Aguiar, F O Lunardi, L F Lima, J B Bruno, B G Alves, D M Magalhães-Padilha, F W S Cibin, L Berioni, G A Apgar, E G Lo Turco, E L Gastal, J R Figueiredo
The effects of epidermal growth factor (EGF) concentrations (0, 10, 50, and 100ng/ml) on in vitro culture (IVC) of equine preantral follicles were evaluated using histology, estradiol and reactive oxygen species (ROS) production and metabolomics. After IVC, the percentage of normal follicles was lower (P<0.05) for all treatments when compared to non-cultured control. EGF 50ng/ml treatment had more (P<0.05) normal follicles at Day 7 of culture when compared with EGF 0 and 100ng/ml. EGF 50ng/ml had more (P<0...
April 8, 2017: Research in Veterinary Science
https://www.readbyqxmd.com/read/28410456/use-of-bone-morphogenetic-protein-15-polymorphisms-to-predict-ovarian-stimulation-outcomes-in-infertile-brazilian-women
#18
Carla Peluso, Cecilia Goldman, Viviane Cavalcanti, Guilherme Gastaldo, Camila Martins Trevisan, Denise Maria Christofolini, Caio Parente Barbosa, Bianca Bianco
AIMS: Polymorphisms in the gene encoding bone morphogenetic protein 15 (BMP15) can result in inhibited secretion or lowered bioactivity of the BMP15 protein. BMP15 levels are associated with follicle-stimulating hormone receptor (FSHR) action on granulosa cells, wherein FSHR increases the sensitivity of ovarian follicles to follicle-stimulating hormone (FSH). In this study we evaluated the BMP15 polymorphisms A905 > G/rs3897937, C901 > T/rs17003221, and C-9 > G/rs3810682 in infertile Brazilian women in terms of anti-Mullerian hormone (AMH), FSH, and estradiol serum levels, as well as controlled ovarian hyperstimulation response and assisted reproduction outcomes...
April 14, 2017: Genetic Testing and Molecular Biomarkers
https://www.readbyqxmd.com/read/28410121/nitric-oxide-signaling-during-meiotic-cell-cycle-regulation-in-mammalian-oocytes
#19
Meenakshi Tiwari, Shilpa Prasad, Ashutosh N Pandey, Karuppanan V Premkumar, Anima Tripathi, Anumegha Gupta, Doddalingaiah R Chetan, Pramod K Yadav, Tulsidas G Shrivastav, Shail K Chaube
  Nitric oxide (NO) acts as a major signal molecules and modulate physiology of mammalian oocytes. Ovarian follicles generate large amount of NO through nitric oxide synthase (NOS) pathway to maintain diplotene arrest in preovulatory oocytes. Removal of oocytes from follicular microenvironment or follicular rupture during ovulation disrupt the flow of NO from granulosa cells to the oocyte that results a transient decrease of oocyte cytoplasmic NO level. Decreased NO level reduces cyclic nucleotides level by inactivating guanylyl cyclases directly or indirectly...
June 1, 2017: Frontiers in Bioscience (Scholar Edition)
https://www.readbyqxmd.com/read/28409689/effects-of-methoxychlor-on-igf-i-signaling-pathway-in-rat-ovary
#20
O Ozden-Akkaya, K Altunbas, A Yagcı
Follicular development and other ovarian functions are regulated by growth factors that can be affected by exogenous agents. Methoxychlor (MXC) is an organochloride pesticide that causes female infertility. We investigated how MXC affects the distribution of developing ovarian follicles in adult rats after treatment between embryonic day (E) 18 and postnatal day (PND) 7. We also measured insulin-like growth factor-I (IGF-I) and its receptor, IGF-IR, expressions in ovarian follicles and investigated whether MXC changed the levels of IGF-I and IGF-IR in the ovary...
2017: Biotechnic & Histochemistry: Official Publication of the Biological Stain Commission
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