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https://www.readbyqxmd.com/read/29020785/-how-is-the-czech-oocyte-donor-the-analysis-of-their-profile
#1
T Rumpíková, I Oborná, S Bělašková, D Rumpík
OBJECTIVE: The aim of our study was to investigate (a) the basic socio-demographic characteristics of Czech oocytes donors, (b) their attitudes towards anonymous or nonanonymous donation and (c) their motivations to donate oocytes. DESIGN: Original article. SETTING: Clinic of Reproductive Medicine and Gynecology Zlin. METHODS: A total of 215 oocytes donors participated in this study, which was undertaken in years 2015-2016...
2017: Ceská Gynekologie
https://www.readbyqxmd.com/read/29020571/factors-and-molecules-that-could-impact-cell-differentiation-in-the-embryo-generated-by-nuclear-transfer
#2
Renata Simões, Arnaldo Rodrigues Santos
Somatic cell nuclear transfer is a technique to create an embryo using an enucleated oocyte and a donor nucleus. Nucleus of somatic cells must be reprogrammed in order to participate in normal development within an enucleated egg. Reprogramming refers to the erasing and remodeling of cellular epigenetic marks to a lower differentiation state. Somatic nuclei must be reprogrammed by factors in the oocyte cytoplasm to a rather totipotent state since the reconstructed embryo must initiate embryo development from the one cell stage to term...
October 11, 2017: Organogenesis
https://www.readbyqxmd.com/read/29018614/anti-apoptotic-properties-of-carbon-monoxide-in-porcine-oocyte-during-in-vitro-aging
#3
David Němeček, Markéta Dvořáková, Ivona Heroutová, Eva Chmelíková, Markéta Sedmíková
If fertilization of matured oocyte does not occur, unfertilized oocyte undergoes aging, resulting in a time-dependent reduction of the oocyte's quality. The aging of porcine oocytes can lead to apoptosis. Carbon monoxide (CO), a signal molecule produced by the heme oxygenase (HO), possesses cytoprotective and anti-apoptotic effects that have been described in somatic cells. However, the effects of CO in oocytes have yet to be investigated. By immunocytochemistry method we detected that both isoforms of heme oxygenase (HO-1 and HO-2) are present in the porcine oocytes...
2017: PeerJ
https://www.readbyqxmd.com/read/28990567/-nuclear-transfer-to-prevent-transmission-of-mtdna-disorders-where-are-we
#4
Julie Steffann, Jean-Paul Bonnefont, Nelly Frydman
The recent birth from a mitochondrial DNA mutation carrier of a child, conceived after transfer in a donor oocyte of the meiotic spindle, taken from the maternal oocyte, revived the debate on the safety of these procedures. The doubts concern mainly the possibility of genetic reversion, the uncertainties about potential disturbances of the dialogue between nuclear and mitochondrial genomes and the side effects of a heteroplasmic state induced by these techniques. The possibility to expand nuclear transfer applications to patients experiencing in vitro fertilization failure, urges us to answer these questions rapidly...
June 2017: Médecine Sciences: M/S
https://www.readbyqxmd.com/read/28971892/production-of-cloned-mice-using-oocytes-derived-from-icr-outbred-strain
#5
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/28947251/supplementation-of-freezing-media-with-stromal-cell-derived-factor-1%C3%AE-preserves-human-sperm-from-cryodamage
#6
Behnaz Hatef, Amirhossein Taromchi, Reza Nejatbakhsh, Ahmad Farrokhi, Saeed Shokri
The destructive effects of sperm cryopreservation result in reduced sperm motility and increased apoptosis. Oocytes, endometrium, and follicular fluid express stromal cell-derived factor-1 alpha (SDF-1α) or C-X-C motif chemokine ligand 12 (CXCL12) while its specific receptor chemokine, CXC motif receptor 4 (CXCR4) is expressed in the head of sperm. SDF-1α can increase sperm motility and preserve normal mitochondrial status. The present study intends to investigate whether the addition of SDF-1α to freezing extender can facilitate cryosurvival of spermatozoa and how SDF-1α protects spermatozoa against damages during cryopreservation...
September 22, 2017: Cryobiology
https://www.readbyqxmd.com/read/28938737/complex-catsper-dependent-and-independent-ca2-i-signalling-in-human-spermatozoa-induced-by-follicular-fluid
#7
Sean G Brown, Sarah Costello, Mark C Kelly, Mythili Ramalingam, Ellen Drew, Stephen J Publicover, Christopher L R Barratt, Sarah Martins Da Silva
STUDY QUESTION: Does progesterone in human follicular fluid (hFF) activate CatSper and do other components of hFF modulate this effect and/or contribute separately to hFF-induced Ca2+ signaling? SUMMARY ANSWER: hFF potently stimulates CatSper and increases [Ca2+]i, primarily due to high concentrations of progesterone, however, other components of hFF also contribute to [Ca2+]i signaling, including modulation of CatSper channel activity and inhibition of [Ca2+]i oscillations...
October 1, 2017: Human Reproduction
https://www.readbyqxmd.com/read/28938728/modeling-of-live-birth-rates-and-cost-effectiveness-of-oocyte-cryopreservation-for-cancer-patients-prior-to-high-and-low-risk-gonadotoxic-chemotherapy
#8
B Lyttle Schumacher, N Grover, T Mesen, A Steiner, J Mersereau
STUDY QUESTION: What is the live-birth rate (LBR) and cost-effectiveness of fertility preservation with oocyte cryopreservation (FP-OC) compared to expectant management in cancer patients age 25-40 based on estimated gonadotoxicity of treatments 5 years after cancer diagnosis? SUMMARY ANSWER: Oocyte cryopreservation prior to cancer treatment is more costly, yet more effective (producing more live births), than not undergoing oocyte cryopreservation but it is most beneficial for patients undergoing high-risk chemotherapy (HRC)...
October 1, 2017: Human Reproduction
https://www.readbyqxmd.com/read/28938488/ovarian-aging-in-women-with-brca-germline-mutations
#9
Wayne Lin, Shiny Titus, Fred Moy, Elizabeth S Ginsburg, Kutluk Oktay
Context: Recent clinical and laboratory studies suggested that women with BRCA mutations have lower ovarian reserve and their primordial follicle oocytes may be more prone to DNA damage but the direct proof is lacking. Objective: To determine whether women with germline BRCA mutations have reduced primordial follicle reserve and increased oocyte DNA damage. Design: A laboratory comparative study of ovarian tissue obtained from the risk-reducing salpingo- oophorectomy (RRSO) samples of unaffected BRCA mutation carrier (BMC) women vs...
August 16, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28923285/patient-and-cycle-characteristics-predicting-high-pregnancy-rates-with-single-embryo-transfer-an-analysis-of-the-society-for-assisted-reproductive-technology-outcomes-between-2004-and-2013
#10
Jennifer Mersereau, Jamie Stanhiser, Charles Coddington, Tiffany Jones, Barbara Luke, Morton B Brown
OBJECTIVE: To analyze factors associated with high live birth rate and low multiple birth rate in fresh and frozen-thawed assisted reproductive technology (ART) cycles. DESIGN: Retrospective cohort analysis. SETTING: Not applicable. PATIENT(S): The study population included 181,523 women undergoing in vitro fertilization with autologous fresh first cycles, 27,033 with fresh first oocyte donor cycles, 37,658 with fresh second cycles, and 35,446 with frozen-thawed second cycles...
September 15, 2017: Fertility and Sterility
https://www.readbyqxmd.com/read/28911211/are-there-intracellular-ca2-oscillations-correlated-with-flagellar-beating-in-human-sperm-a-three-vs-two-dimensional-analysis
#11
G Corkidi, F Montoya, P Hernández-Herrera, W A Ríos-Herrera, M F Müller, C L Treviño, A Darszon
STUDY QUESTION: Are there intracellular Ca2+ ([Ca2+]i) oscillations correlated with flagellar beating in human sperm? SUMMARY ANSWER: The results reveal statistically significant [Ca2+]i oscillations that are correlated with the human sperm flagellar beating frequency, when measured in three-dimensions (3D). WHAT IS KNOWN ALREADY: Fast [Ca2+]i oscillations that are correlated to the beating flagellar frequency of cells swimming in a restricted volume have been detected in hamster sperm...
September 1, 2017: Molecular Human Reproduction
https://www.readbyqxmd.com/read/28904494/vitamin-d-deficiency-does-not-influence-reproductive-outcomes-of-ivf-icsi-a-study-of-oocyte-donors-and-recipients
#12
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/28882430/reproductive-outcomes-in-recipients-are-not-associated-with-oocyte-donor-body-mass-index-up-to-28%C3%A2-kg-m-2-a-cohort-study-of-2722-cycles
#13
Francisca Martínez, Alejandro Kava-Braverman, Elisabet Clúa, Ignacio Rodríguez, Sofia Gaggiotti Marre, Buenaventura Coroleu, Pedro N Barri
The effect of increasing donor body mass index (BMI) on clinical pregnancies was retrospectively analysed in a cohort of consecutive 2722 donor oocyte IVF cycles. The relationship between donor BMI and clinical pregnancies was assessed after adjusting for recipient BMI. Clinical pregnancy rates and live birth rates (LBR) were no different with increasing donor BMI (up to donor BMI ≤28 kg/m(2)). The odds of pregnancy did not vary with donor BMI. Compared with donor BMI quartile 1, OR 95% CI of clinical pregnancy was 1...
August 15, 2017: Reproductive Biomedicine Online
https://www.readbyqxmd.com/read/28876028/-program-optimization-before-enucleation-on-ovine-somatic-cell-nuclear-transfer
#14
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/28863933/window-of-implantation-transcriptomic-stratification-reveals-different-endometrial-subsignatures-associated-with-live-birth-and-biochemical-pregnancy
#15
Patricia Díaz-Gimeno, Maria Ruiz-Alonso, Patricia Sebastian-Leon, Antonio Pellicer, Diana Valbuena, Carlos Simón
OBJECTIVE: To refine the endometrial window of implantation (WOI) transcriptomic signature by defining new subsignatures associated to live birth and biochemical pregnancy. DESIGN: Retrospective cohort study. SETTING: University-affiliated in vitro fertilization clinic and reproductive genetics laboratory. PATIENT(S): Healthy fertile oocyte donors (n = 79) and patients with infertility diagnosed by Endometrial Receptivity Analysis (n = 771)...
October 2017: Fertility and Sterility
https://www.readbyqxmd.com/read/28860865/advanced-maternal-age-ethical-and-medical-considerations-for-assisted-reproductive-technology
#16
REVIEW
Brittany J Harrison, Tara N Hilton, Raphaël N Rivière, Zachary M Ferraro, Raywat Deonandan, Mark C Walker
OBJECTIVES: This review explores the ethical and medical challenges faced by women of advanced maternal age who decide to have children. Assisted reproductive technologies (ARTs) make post-menopausal pregnancy physiologically plausible, however, one must consider the associated physical, psychological, and sociological factors involved. METHODS: A quasi-systematic review was conducted in PubMed and Ovid using the key terms post-menopause, pregnancy + MeSH terms [donations, hormone replacement therapy, assisted reproductive technologies, embryo donation, donor artificial insemination, cryopreservation]...
2017: International Journal of Women's Health
https://www.readbyqxmd.com/read/28854585/sperm-chemorepulsion-a-supplementary-mechanism-to-regulate-fertilization
#17
H A Guidobaldi, M Cubilla, A Moreno, M V Molino, L Bahamondes, L C Giojalas
STUDY QUESTION: Are human spermatozoa able of chemorepulsive behaviour? SUMMARY ANSWER: Capacitated human spermatozoa are able to be chemorepelled by synthetic Progesterone Receptor Ligands (sPRL, known as contraceptives) and zinc (a cation released by the oocyte upon fertilization). WHAT IS KNOWN ALREADY: Moving cells can be oriented towards or against a molecular gradient, processes called chemoattraction and chemorepulsion, respectively, which have been described in unicellular organisms such as amoebas and bacteria, to organismic cells such macrophages and developmental cells...
August 1, 2017: Human Reproduction
https://www.readbyqxmd.com/read/28843841/relationship-between-time-post-ovulation-and-progesterone-on-oocyte-maturation-and-pregnancy-in-canine-cloning
#18
Joung Joo Kim, Kang Bae Park, Eun Ji Choi, Sang Hwan Hyun, Nam-Hyung Kim, Yeon Woo Jeong, Woo Suk Hwang
Canine oocytes ovulated at prophase complete meiosis and continue to develop in presence of a high progesterone concentration in the oviduct. Considering that meiotic competence of canine oocyte is accomplished in the oviductal environment, we postulate that hormonal milieu resulting from the circulating progesterone concentration may affect oocyte maturation and early development of embryos. From 237 oocyte donors, 2620 oocytes were collected and their meiotic status and morphology were determined. To determine optimal characteristics of the mature oocytes subjected to nuclear transfer, a proportion of the meiotic status of the oocytes were classified in reference to time post-ovulation as well as progesterone (P4) level...
October 2017: Animal Reproduction Science
https://www.readbyqxmd.com/read/28837025/comparison-of-two-different-dosage-of-gnrh-agonist-as-ovulation-trigger-in-oocyte-donors-a-randomized-controled-trial
#19
Sonia Morales Zarcos, Pamela Valdivieso Mejía, Carla Donado Stefani, Pascual Sánchez Martin, Fernando Sánchez Martin
OBJECTIVE: To compare the results obtained with two different GnRH agonist dosages: 0.3mg versus 0.4mg to trigger ovulation in oocyte donor cycles. METHODS: Experimental controlled randomized trial including 40 patients from a private practice center. The patients were randomized into two groups. Group A received a single dose of Triptorelin 0.3mg (Decapeptyl®) 36hours before pick-up. Group B patients received Triptorelin 0.4mg (Decapeptyl®) before pick-up to final oocyte maturation...
September 1, 2017: JBRA Assisted Reproduction
https://www.readbyqxmd.com/read/28836261/reduction-of-nitric-oxide-level-results-in-maturation-promoting-factor-destabilization-during-spontaneous-meiotic-exit-from-diplotene-arrest-in-rat-cumulus-oocytes-complexes-cultured-in%C3%A2-vitro
#20
Meenakshi Tiwari, Shail K Chaube
Nitric oxides (NO) act as one of the major signal molecules and modulate various cell functions including oocyte meiosis in mammals. The present study was designed to investigate the mechanism of NO action during spontaneous meiotic exit from diplotene arrest (EDA) in rat cumulus oocytes complexes (COCs) cultured in vitro. Diplotene-arrested COCs collected from ovary of immature female rats after 20 IU pregnant mare's serum gonadotropins (PMSG) for 48 h were exposed to various concentrations of NO donor, S-nitroso-N-acetyl penicillamine (SNAP) and inducible nitric oxide synthase (iNOS) inhibitor, aminoguanidine (AG) for 3 h in vitro and downstream factors were analyzed...
September 2017: Development, Growth & Differentiation
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