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https://www.readbyqxmd.com/read/28927010/the-role-of-oocyte-organelles-in-determining-developmental-competence
#1
REVIEW
Karen L Reader, Jo-Ann L Stanton, Jennifer L Juengel
The ability of an oocyte to undergo successful cytoplasmic and nuclear maturation, fertilization and embryo development is referred to as the oocyte's quality or developmental competence. Quality is dependent on the accumulation of organelles, metabolites and maternal RNAs during the growth and maturation of the oocyte. Various models of good and poor oocyte quality have been used to understand the essential contributors to developmental success. This review covers the current knowledge of how oocyte organelle quantity, distribution and morphology differ between good and poor quality oocytes...
September 18, 2017: Biology
https://www.readbyqxmd.com/read/28923420/high-doses-of-lipid-core-nanocapsules-do-not-affect-bovine-embryonic-development-in-vitro
#2
Caroline Lucas, Mariana Remião, Franciele Bruinsmann, Isadora Lopes, Morgana Borges, Ana Laura Feijó, Andrea Cristina Basso, Adriana Pohlmann, Silvia Guterres, Vinicius Campos, Fabiana Seixas, Tiago Collares
The improvement of in vitro embryo production by culture media supplementation has been a potential tool to increase blastocyst quality and development. Recently, lipid-core nanocapsules (LNC), which were developed for biomedical applications as a drug-delivery system, have demonstrated beneficial effects on in vitro embryo production studies. LNCs have a core composed of sorbitan monostearate dispersed in capric/caprylic triglyceride. Based on that, we firstly investigated if LNCs supplemented during in vitro oocyte maturation had affinity to the mineral oil placed over the top of the IVM media...
September 15, 2017: Toxicology in Vitro: An International Journal Published in Association with BIBRA
https://www.readbyqxmd.com/read/28922408/the-role-of-the-pi3k-akt-signaling-pathway-in-the-developmental-competence-of-bovine-oocytes
#3
Gabriella Mamede Andrade, Juliano Coelho da Silveira, Claudia Perrini, Maite Del Collado, Samuel Gebremedhn, Dawit Tesfaye, Flávio Vieira Meirelles, Felipe Perecin
The ovarian follicle encloses oocytes in a microenvironment throughout their growth and acquisition of competence. Evidence suggests a dynamic interplay among follicular cells and oocytes, since they are constantly exchanging "messages". We dissected bovine ovarian follicles and recovered follicular cells (FCs-granulosa and cumulus cells) and cumulus-oocyte complexes (COCs) to investigate whether the PI3K-Akt signaling pathway impacted oocyte quality. Following follicle rupture, COCs were individually selected for in vitro cultures to track the follicular cells based on oocyte competence to reach the blastocyst stage after parthenogenetic activation...
2017: PloS One
https://www.readbyqxmd.com/read/28916873/effects-of-methotrexate-on-the-quality-of-oocyte-maturation-in-vitro
#4
N Tian, J Yu, Sh Zhang, W Y Ma, T Wang, Y M Wang
Methotrexate (MTX), an antifolate drug, is widely used for clinical treatment of malignancies and ectopic pregnancy. Many studies have documented that MTX has strong side-effects on rapidly dividing somatic cells. However, its side-effects on female reproductive cells have not been widely reported. Combined with in vitro culture, two-photon fluorescence imaging and three-dimensional reconstruction, this study analyzed the effects of MTX on oocyte maturation time, chromosome arrangement, karyotype, spindle morphology, and the localization of microtubule organizing centers (MTOCs)...
September 15, 2017: European Biophysics Journal: EBJ
https://www.readbyqxmd.com/read/28915981/transcutaneous-electrical-acupoint-stimulation-improves-the-outcomes-of-in-vitro-fertilization-a-prospective-randomized-and-controlled-study
#5
Fan Qu, Fang-Fang Wang, Yan Wu, Jue Zhou, Nicola Robinson, Paul J Hardiman, Jie-Xue Pan, Yi-Jing He, Yu-Hang Zhu, Han-Zhi Wang, Xiao-Qun Ye, Ke-Lin He, Long Cui, Hong-Li Zhao, Ying-Hui Ye
OBJECTIVES: To explore whether transcutaneous electrical acupoint stimulation (TEAS) can improve the outcomes of in vitro fertilization (IVF). DESIGN: A prospective, randomized, and controlled study. SETTING: IVF center in a university hospital. PARTICIPANTS: Four hundred and eighty-one infertile patients with bilateral tubal blockage who were referred for IVF. Patients were randomized into four groups. INTERVENTION: TEAS was administered for 30min, respectively, at 24h before TVOR and two hours before ET...
September 2017: Explore: the Journal of Science and Healing
https://www.readbyqxmd.com/read/28910399/cholesterol-added-prior-to-vitrification-on-the-cryotolerance-of-immature-and-in-vitro-matured-bovine-oocytes
#6
Núria Arcarons, Roser Morató, Meritxell Vendrell, Marc Yeste, Manel López-Bejar, Kosala Rajapaksha, Muhammad Anzar, Teresa Mogas
This study examines whether incorporating cholesterol-loaded methyl-β-cyclodextrin (CLC) in the bovine oocyte plasma membrane improves oocyte tolerance to vitrification. In vitro matured oocytes were incubated with 2 mg/ml BODIPY-labeled CLC for different time intervals in FCS or PVA supplemented medium or exposed to different CLC concentrations to examine the subcellular localization of cholesterol by confocal microscopy live-cell imaging. Subsequently, the effects of optimized CLC concentrations and incubation times prior to vitrification on early embryo development were assessed...
2017: PloS One
https://www.readbyqxmd.com/read/28904494/vitamin-d-deficiency-does-not-influence-reproductive-outcomes-of-ivf-icsi-a-study-of-oocyte-donors-and-recipients
#7
Manish Banker, Dipesh Sorathiya, Sandeep Shah
BACKGROUND: Vitamin D and its active metabolite, 1,25-dihydroxy vitamin D (1,25-(OH)2D3), play a significant role in reproduction. AIM: To assess the effect of serum 25-hydroxy vitamin D level on oocyte quality and endometrial receptivity by studying oocyte donors and their recipients. MATERIALS AND METHODS: This prospective study consisted of two groups: Group A (recipient group) and Group B (donor group). All the participants of Groups A1 and B1 as well as Groups A2 and B2 were subcategorized into vitamin D-deficient (<20 ng/mL) and vitamin D replete-insufficient (20 to ≥30 ng/mL), respectively...
April 2017: Journal of Human Reproductive Sciences
https://www.readbyqxmd.com/read/28904021/bap-exposure-causes-oocyte-meiotic-arrest-and-fertilization-failure-to-weaken-female-fertility
#8
Mianqun Zhang, Yilong Miao, Qian Chen, Meng Cai, Wenkang Dong, Xiaoxin Dai, Yajuan Lu, Changyin Zhou, Zhaokang Cui, Bo Xiong
Benzo[a]pyrene (BaP) is a ubiquitous environmental pollutant and carcinogen that is frequently found in particulate matter, with a diameter of ≤2.5 μm (PM2.5). It has been reported to interrupt the normal reproductive system, but the exact molecular basis has not been clearly defined. To understand the underlying mechanisms regarding how BaP exposure disrupts female fertility, we evaluated oocyte quality by assessing the critical regulators and events during oocyte meiotic maturation and fertilization. We found that BaP exposure compromised the mouse oocyte meiotic progression by disrupting normal spindle assembly, chromosome alignment, and kinetochore-microtubule attachment, consequently leading to the generation of aneuploid eggs...
September 13, 2017: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/28900763/the-association-between-fatty-acid-index-and-in-vitro-fertilization-outcomes
#9
Ashley M Eskew, Kelly C Wormer, Michelle L Matthews, H James Norton, Margaret A Papadakis, Bradley S Hurst
PURPOSE: Fatty acids have been shown to play an important role in oocyte competence and early implantation of the embryo. Our hypothesis-generating study sought to determine if individual fatty acids expressed as a percentage of total erythrocyte fatty acids are associated with embryo quality and other in vitro fertilization (IVF) outcomes. METHODS: This was a prospective cohort study at an academic fertility center. Sixty women undergoing their first IVF cycle were recruited...
September 13, 2017: Journal of Assisted Reproduction and Genetics
https://www.readbyqxmd.com/read/28895679/a-modern-approach-to-the-management-of-patients-candidate-to-assisted-reproductive-technologies
#10
Roberta Venturella, Alberto Vaiarelli, Daniela Lico, Filippo M Ubaldi, Fulvio Zullo, Costantino DI Carlo
The growing use of Assisted Reproductive Technologies (ART) and the incorrect information from mass media, determined in the public the wrong idea that the right moment of life for programming a pregnancy can be delayed well beyond the physiological fertile age. Spare and insufficient health authorities' interventions are driven to explain to the general population the reduction of the fertility potential of couples and particularly of women with advancing age. This situation, characterized by more and more women seeking for pregnancy after age 38-40 imposes to specialists in Reproductive Medicine an honest and transparent counselling...
September 12, 2017: Minerva Ginecologica
https://www.readbyqxmd.com/read/28894044/mitochondrial-functionality-in-female-reproduction
#11
Łukasz Gąsior, Regina Daszkiewicz, Mateusz Ogórek, Zbigniew Polański
In most animal species female germ cells are the source of mitochondrial genome for the whole body of individuals. As a source of mitochondrial DNA for future generations the mitochondria in the female germ line undergo dynamic quantitative and qualitative changes. In addition to maintaining the intact template of mitochondrial genome from one generation to another, mitochondrial role in oocytes is much more complex and pleiotropic. The quality of mitochondria determines the ability of meiotic divisions, fertilization ability, and activation after fertilization or sustaining development of a new embryo...
January 4, 2017: Postȩpy Higieny i Medycyny Doświadczalnej
https://www.readbyqxmd.com/read/28892223/dehydroepiandrosterone-as-a-potential-agent-to-slow-down-ovarian-aging
#12
Li-Te Lin, Jiin-Tsuey Cheng, Peng-Hui Wang, Chia-Jung Li, Kuan-Hao Tsui
AIM: Ovarian aging, which leads to diminished ovarian reserve and decreased oocyte quality, is highly associated with poor reproductive outcomes. It has been suggested that dehydroepiandrosterone (DHEA) might be able to temporarily slow down the aging process. This study attempted to investigate the clinical benefits of DHEA in older patients and the anti-senescence effect of DHEA on cumulus cells (CC) and human ovarian granulosa cells (HO23 cell line). METHODS: This prospective study enrolled 88 patients who underwent in vitro fertilization (IVF), including 30 younger patients (aged ≤ 37 years) and 58 older patients (aged > 37 years)...
September 11, 2017: Journal of Obstetrics and Gynaecology Research
https://www.readbyqxmd.com/read/28886319/morphokinetic-analysis-of-human-embryo-development-and-its-relationship-to-the-female-age-a-retrospective-time-lapse-imaging-study
#13
N Akhter, M Shahab
Time-lapse imaging technique has provided embryologists with a unique chance of studying the embryo morphokineticsto select the most viable embryos for implantation in the field of IVF (In vitro fertilization).The conventional method of morphological evaluations has proved that maternal age affects the human embryo quality. This retrospective study carried out at Islamabad Clinic Serving Infertile Couples, Islamabad, Pakistan mainly focuses on the effect of female age on human embryo morphokinetics. A total number of 200 patients undergoing ICSI treatment cycles at the clinic were selected for the study and divided into five age groups (< 26, 26-30, 31-35, 36-40, and > 40 years)...
August 30, 2017: Cellular and Molecular Biology
https://www.readbyqxmd.com/read/28881852/epigenetic-dynamics-and-interplay-during-spermatogenesis-and-embryogenesis-implications-for-male-fertility-and-offspring-health
#14
REVIEW
Shao-Qin Ge, Sheng-Li Lin, Zheng-Hui Zhao, Qing-Yuan Sun
Mapping epigenetic modifications and identifying their roles in the regulation of spermatogenesis and embryogenesis are essential for gaining fundamental medical understandings and for clinical applications. More and more evidence has shown that specific epigenetic modifications are established during spermatogenesis, which will be transferred into oocyte via fertilisation, and play an important role in the early embryo development. Defects in epigenetic patterns may increase the risk of abnormal spermatogenesis, fertilisation failure, early embryogenesis abnormality and several other complications during pregnancy...
August 8, 2017: Oncotarget
https://www.readbyqxmd.com/read/28878377/calcium-ion-regulation-by-bapta-am-and-ruthenium-red-improved-the-fertilisation-capacity-and-developmental-ability-of-vitrified-bovine-oocytes
#15
Na Wang, Hai-Sheng Hao, Chong-Yang Li, Ya-Han Zhao, Hao-Yu Wang, Chang-Liang Yan, Wei-Hua Du, Dong Wang, Yan Liu, Yun-Wei Pang, Hua-Bin Zhu, Xue-Ming Zhao
Vitrification reduces the fertilisation capacity and developmental ability of mammalian oocytes; this effect is closely associated with an abnormal increase of cytoplasmic free calcium ions ([Ca(2+)]i). However, little information about the mechanism by which vitrification increases [Ca(2+)]i levels or a procedure to regulate [Ca(2+)]i levels in these oocytes is available. Vitrified bovine oocytes were used to analyse the effect of vitrification on [Ca(2+)]i, endoplasmic reticulum Ca(2+) (ER Ca(2+)), and mitochondrial Ca(2+) (mCa(2+)) levels...
September 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28876028/-program-optimization-before-enucleation-on-ovine-somatic-cell-nuclear-transfer
#16
Yanhua Guo, Yiyuan Zhang, Limin Wang, Hong Tang, Yingli Li, Ping Zhou
Ovine somatic cell nuclear transfer (SCNT) efficiency remains lower. Therefore, we optimized the program before oocyte enucleation on ovine SCNT. Four experiments were done including exposure duration of ovaries (3 h or 3 to 5 h), duration of oocytes maturation (18 h and 24 h), rate of donor adherent and enucleation time of maturate oocyte. The maturation rates of oocyte, fusion rates and cleavation rates of cloned embryos were used to assess the efficiency of different procedures. The maturation rates of ovaries with 3 h exposure was higher than that of 3 to 5 h (60...
May 25, 2017: Sheng Wu Gong Cheng Xue Bao, Chinese Journal of Biotechnology
https://www.readbyqxmd.com/read/28870888/cell-secreted-vesicles-containing-micrornas-as-regulators-of-gamete-maturation
#17
Juliano C da Silveira, Ana Clara F C M de Avila, Hannah L Garrett, Jason Bruemmer, Quinton Winger, Gerrit Bouma
Mammalian gamete maturation requires extensive signaling between germ cells and their surrounding somatic cells. In the ovary, theca cells, mural granulosa cells, cumulus cells and the oocyte all secrete factors throughout follicle growth and maturation that are critical for ovulation of a high quality oocyte with the competence to develop into an embryo. Similarly, maturation of sperm occurs as it transits the epididymis during which epididymal epithelium and sperm exchange secretory factors that are required for sperm to gain motility and fertility...
September 4, 2017: Journal of Endocrinology
https://www.readbyqxmd.com/read/28870217/controlled-ovulation-of-the-dominant-follicle-using-progestin-in-minimal-stimulation-in-poor-responders
#18
Qiuju Chen, Yun Wang, Lihua Sun, Shaozhen Zhang, Weiran Chai, Qingqing Hong, Hui Long, Li Wang, Qifeng Lyu, Yanping Kuang
BACKGROUND: The use of progestin (P) during ovarian stimulation is effective in blocking the luteinizing hormone (LH) surge in women with normal ovarian reserve, however, its effects have not been determined in poor responders. This study aimed to explore the follicular dynamics in P-primed minimal stimulation in poor responders. METHODS: A total of 204 infertile women with diminished ovarian reserve were allocated into the medroxyprogesterone acetate (MPA) group or the natural-cycle control group in an alternating order...
September 5, 2017: Reproductive Biology and Endocrinology: RB&E
https://www.readbyqxmd.com/read/28867294/the-rna-m-6-a-reader-ythdf2-is-essential-for-the-post-transcriptional-regulation-of-the-maternal-transcriptome-and-oocyte-competence
#19
Ivayla Ivanova, Christian Much, Monica Di Giacomo, Chiara Azzi, Marcos Morgan, Pedro N Moreira, Jack Monahan, Claudia Carrieri, Anton J Enright, Dónal O'Carroll
YTHDF2 binds and destabilizes N(6)-methyladenosine (m(6)A)-modified mRNA. The extent to which this branch of m(6)A RNA-regulatory pathway functions in vivo and contributes to mammalian development remains unknown. Here we find that YTHDF2 deficiency is partially permissive in mice and results in female-specific infertility. Using conditional mutagenesis, we demonstrate that YTHDF2 is autonomously required within the germline to produce MII oocytes that are competent to sustain early zygotic development. Oocyte maturation is associated with a wave of maternal RNA degradation, and the resulting relative changes to the MII transcriptome are integral to oocyte quality...
August 30, 2017: Molecular Cell
https://www.readbyqxmd.com/read/28865549/effect-of-oocyte-vitrification-on-embryo-quality-time-lapse-analysis-and-morphokinetic-evaluation
#20
Ana Cobo, Aila Coello, Jose Remohí, Jose Serrano, Jose Maria de Los Santos, Marcos Meseguer
OBJECTIVE: To analyze whether oocyte vitrification may affect subsequent embryo development from a morphokinetic standpoint by means of time-lapse imaging. DESIGN: Observational cohort study. SETTING: University-affiliated private IVF center. PATIENT(S): Ovum donation cycles conducted with the use of vitrified (n = 631 cycles; n = 3,794 embryos) or fresh oocytes (n = 1,359 cycles; n = 9,935 embryos) over 2 years. INTERVENTIONS(S): None...
September 2017: Fertility and Sterility
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