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Vitrification

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https://www.readbyqxmd.com/read/29353144/effects-of-the-hdac-inhibitor-scriptaid-on-the-in%C3%A2-vitro-development-of-bovine-embryos-and-on-imprinting-gene-expression-levels
#1
R Laguna-Barraza, M J Sánchez-Calabuig, A Gutiérrez-Adán, D Rizos, S Pérez-Cerezales
This study examines the effects of the histone deacetylation inhibitor scriptaid (SCR) on preimplantation embryo development in vitro and on imprinting gene expression. We hypothesized that SCR would increase histone acetylation levels, enhance embryonic genome activation, and regulate imprinting and X-chromosome inactivation (XCI) in in vitro produced bovine embryos. Zygotes were cultured in vitro in presence or absence of SCR added at different time points. We assessed cleavage and blastocyst rates as well as the quality of blastocysts through: (i) differential cell counts; (ii) survival after vitrification/thawing and (iii) gene expression analysis -including imprinted genes...
January 11, 2018: Theriogenology
https://www.readbyqxmd.com/read/29353141/vitrification-of-testicular-tissue-from-prepubertal-cats-in-cryotubes-using-different-cryoprotectant-associations
#2
David Baruc Cruvinel Lima, Ticiana Franco Pereira da Silva, Annice Aquino-Cortez, Johanna Leiva-Revilla, Lúcia Daniel Machado da Silva
Protocols for the cryopreservation of testicular tissue are not yet established. In cats, few studies have been conducted on testicular vitrification using different cryoprotectant associations (CPAs). Thus, the objective of this study was to compare the effect of different CPAs on the vitrification of testicular tissue from prepubertal cats in cryotubes. We used 10 pairs of testicles, with each pair divided into 8 fragments that were distributed into different experimental groups. Two of these fragments were allocated into the control group (CG) and the other six were distributed according to the CPAs to be tested (dimethyl sulfoxide (DMSO)/glycerol (GLY), ethylene glycol (EG)/GLY, or DMSO/EG)...
January 5, 2018: Theriogenology
https://www.readbyqxmd.com/read/29353140/development-of-sea-bream-sparus-aurata-semen-vitrification-protocols
#3
Loredana Zilli, Annalisa Bianchi, Maroua Sabbah, Laura Pecoraro, Roberta Schiavone, Sebastiano Vilella
The long-term goal of this research project is to set up efficient protocol that can be used to develop a standardized approach for vitrification of marine fish spermatozoa. In particular, the aim of the present study was to develop a vitrification protocol for sea bream (Sparus aurata) spermatozoa. To draw up the protocol, we tested two different dilution media (1% NaCl and Mounib medium), three different vitrification devices (loops, drops and cut straws), different cryoprotectants (CPs) and three different equilibration times (30, 60 and 120 s)...
January 11, 2018: Theriogenology
https://www.readbyqxmd.com/read/29352979/evaluation-of-sheep-ovarian-tissue-cryopreserved-by-slow-freezing-or-vitrificaton-after-chick-embryo-chorioallantoic-membrane-transplantation
#4
Mahboubeh Vatanparast, Mohammad Ali Khalili, Nahid Yari, Marjan Omidi, Mehdi Mohsenzadeh
The aim of our investigations was to compare the effectiveness of two methods for cryopreservation of sheep ovarian tissue, slow freezing and vitrification. The quality of cryopreserved tissues was evaluated after 5 days of thawing and chorioallantoic membrane (CAM) transplantation. Follicular structure, stromal integrity and neovascularization were assessed. The areas of fibrosis and necrosis were measured using MICROVISIBLE software, and proliferation was assessed with Ki-67 immunostaning. After 5 days of culture, the proportion of primordial follicles decreased, whereas the primary and intermediary follicles increased insignificantly (p > ...
January 15, 2018: Cryobiology
https://www.readbyqxmd.com/read/29345751/first-evidence-of-freezing-tolerance-in-a-resurrection-plant-insights-into-molecular-mobility-and-zeaxanthin-synthesis-in-the-dark
#5
Beatriz Fernández-Marín, Gilbert Neuner, Edith Kuprian, Jose Manuel Laza, J I José Ignacio García-Plazaola, Amy Verhoeven
The photoprotective mechanisms of desiccation tolerance and freezing tolerance and their relation to molecular mobility (cell vitrification) were assessed in a single model: the exceptional subalpine and resurrection plant Ramonda myconi. Dehydrated leaves showed a drop in Fv /Fm accompanied by synthesis of zeaxanthin (Z), even in the dark, which was limited by cell vitrification after complete desiccation. The recovery of Fv /Fm after a severe drying treatment (7 d at 50% RH) confirmed the tolerance of R. myconi leaves to desiccation...
January 18, 2018: Physiologia Plantarum
https://www.readbyqxmd.com/read/29334209/comparison-of-the-effects-of-vitrification-on-gene-expression-of-mature-mouse-oocytes-using-cryotop-and-open-pulled-straw
#6
Fardin Amidi, Zahra Khodabandeh, Mohamad Hossain Nori Mogahi
Background: Oocyte cryopreservation is an essential part of the assisted reproductive technology (ART), which was recently introduced into clinical practice. This study aimed to evaluate the effects of two vitrification systems-Cryotop and Open Pulled Straw (OPS)-on mature oocytes gene expressions. MATERIALS AND METHODS: In this experimental study, the survival rate of metaphase II (MII) mouse oocytes were assessed after cryopreservation by vitrification via i. OPS or ii...
April 2018: International Journal of Fertility & Sterility
https://www.readbyqxmd.com/read/29332622/in-vivo-and-in-vitro-strategies-to-support-caprine-preantral-follicle-development-after-ovarian-tissue-vitrification
#7
N J Donfack, K A Alves, B G Alves, R M P Rocha, J B Bruno, L F Lima, C H Lobo, R R Santos, S F S Domingues, M Bertolini, J Smitz, A P R Rodrigues
The aim of the present study was to compare fresh and vitrified goat ovarian tissue after autotransplantation and in vitro culture. Adult goats were completely ovariectomised and each ovarian pair was sliced and distributed among six different treatment groups: fresh control, fresh transplant, fresh culture, vitrified control, vitrified transplant and vitrified culture. Follicular morphology, development, growth, density, revascularisation and hormone production were evaluated in all groups. Three antral follicles (two in the fresh transplant and one in the vitrified transplant groups) were observed on the surface of the graft 90 days after transplantation...
January 15, 2018: Reproduction, Fertility, and Development
https://www.readbyqxmd.com/read/29331828/a-recovery-time-after-warming-restores-mitochondrial-function-and-improves-developmental-competence-of-vitrified-ovine-oocytes
#8
Sara Succu, Sergio Domenico Gadau, Elisa Serra, Angelo Zinellu, Ciriaco Carru, Cristian Porcu, Salvatore Naitana, Fiammetta Berlinguer, Giovanni Giuseppe Leoni
The aim of the present study was to assess the ability of vitrified/warmed oocyte to recover from vitrification-induced damages after warming. In vitro matured, vitrified/warmed ovine oocytes were assessed for developmental competence, mitochondrial activity and distribution, ATP, ROS and catalase levels during 6 h of in vitro culture using fresh oocytes as control. ATP content in vitrified oocytes was lower than control during 4 h of post warming culture (p < .01). Vitrified oocytes were able to fill this gap only after 6 h of post-warming incubation...
December 26, 2017: Theriogenology
https://www.readbyqxmd.com/read/29327596/fertility-preservation-in-brca-mutated-women-when-and-how
#9
Michaël Grynberg, Jade Raad, Marjorie Comtet, Claire Vinolas, Isabelle Cédrin-Durnerin, Charlotte Sonigo
BRCA 1 and 2 genes play a critical role in the safeguarding of DNA integrity. It is now well established that BRCA1 and BRCA2-mutated women are at increased risk of breast and ovarian cancers. However, several lines of evidence indicate that this genetic status may also be associated with ovarian dysfunction, in particular a reduced ovarian reserve. Considering the gonadal toxicity of cancer treatments and the recommendation of prophylactic bilateral salpingo-oophorectomy around 40 years, young BRCA mutation carriers are confronted with difficult family planning decisions...
January 12, 2018: Future Oncology
https://www.readbyqxmd.com/read/29316020/vitrification-and-in-vitro-culture-had-no-adverse-effect-on-the-follicular-development-and-gene-expression-of-stimulated-human-ovarian-tissue
#10
Mahdi Ramezani, Mojdeh Salehnia, Mina Jafarabadi
AIM: The study assesses the effect of the vitrification procedure on the integrity, morphology, follicular development and gene expression of stimulated human ovarian tissue after warming and two weeks of in vitro culture. METHODS: Ovarian specimens were divided into non-vitrified and vitrified groups and were cultured for two weeks. Morphological analysis and immunohistochemistry were performed. The 17-β estradiol and anti-Müllerian hormone levels in collected media were assessed...
January 5, 2018: Journal of Obstetrics and Gynaecology Research
https://www.readbyqxmd.com/read/29305835/vitrification-of-germinal-vesicle-stage-equine-oocytes-effect-of-cryoprotectant-exposure-time-on-in-vitro-embryo-production
#11
Heloísa Siqueira Canesin, Joao Gatto Brom-de-Luna, Young-Ho Choi, Amanda Macedo Pereira, Gustavo Guerino Macedo, Katrin Hinrichs
Previous studies have found low rates of blastocyst development (0-11%) after vitrification of germinal vesicle (GV)-stage equine oocytes. In this study, we systematically evaluated a short (non-equilibrating) system for GV-stage oocyte vitrification. In Exp. 1, we assessed oocyte volume in cumulus-oocyte complexes (COCs) exposed to components of a short protocol, using 2% each of ethylene glycol and propylene glycol in the first solution (VS1); 17.5% of each plus 0.3 M trehalose in the second solution (VS2); and fetal bovine serum as the base medium...
January 3, 2018: Cryobiology
https://www.readbyqxmd.com/read/29302676/linking-slow-dynamics-and-microscopic-connectivity-in-dense-suspensions-of-charged-colloids
#12
Ruben Higler, Johannes Krausser, Jasper van der Gucht, Alessio Zaccone, Joris Sprakel
The quest to unravel the nature of the glass transition, where the viscosity of a liquid increases by many orders of magnitude, while its static structure remains largely unaffected, remains unresolved. While various structural and dynamical precursors to vitrification have been identified, a predictive and quantitative description of how subtle changes at the microscopic scale give rise to the steep growth in macroscopic viscosity is missing. It was recently proposed that the presence of long-lived bonded structures within the liquid may provide the long-sought connection between local structure and global dynamics...
January 5, 2018: Soft Matter
https://www.readbyqxmd.com/read/29288975/fertilizing-capacity-of-vitrified-epididymal-sperm-from-iberian-ibex-capra-pyrenaica
#13
J Pradieé, M J Sánchez-Calabuig, C Castaño, E O'Brien, M C Esteso, P Beltrán-Breña, V Maillo, J Santiago-Moreno, D Rizos
In this study, we successfully described for the first time a vitrification of epididymal Iberian ibex spermatozoa. Spermatozoa from epididymis were obtained from 15 Iberian ibex. The right epididymis' semen sample was vitrified and the left one was frozen. After thawing/warming, samples were selected by density gradient. Sperm characteristics from each treatment were evaluated. To test the spermatozoa fertilization ability, heterologous IVF was carried out using bovine oocytes. Despite of the observation of a decrease of about 40% for motility sperm between pre-freezing and post-thawing (75...
December 20, 2017: Theriogenology
https://www.readbyqxmd.com/read/29286246/tactoid-annealing-improves-order-in-self-assembled-cellulose-nanocrystal-films-with-chiral-nematic-structures
#14
Andy Tran, Wadood Y Hamad, Mark J MacLachlan
The self-assembly process in cellulose nanocrystal (CNC) film formation was studied as a function of evaporation time. It is known that the total evaporation time of CNC dispersions affects the structure of the film obtained, but the extension of different phases of the evaporation has not been explored. By extending the evaporation time of CNC suspensions after the onset of liquid crystallinity, the homogeneity of the resulting films could be improved as observed by polarized optical microscopy and scanning electron microscopy...
December 29, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29273312/effect-of-cryopreservation-on-the-pre-hatching-behavior-in-the-mexican-fruit-fly-anastrepha-ludens-loew-diptera-tephritidae
#15
Arun Rajamohan, Joseph P Rinehart, Roger A Leopold
In a sampling of untreated embryos of the economically important fruit pest species, Anastrepha ludens, the cumulative hatch percentage in the lab was noted to be ∼85%. Approximately 70% of the larvae had eclosed through the posterior pole of the egg. This process is effected by the act of Pole Reversal (PR) of the fully developed pre-hatch larva from the wider anterior to the narrower posterior pole of the egg. Investigation of the effects of cryopreservation and various pretreatments prior to cryostorage on the PR behavior was prompted by the observation of significantly lower proportion of cryopreserved embryos exhibiting the PR behavior...
December 19, 2017: Cryobiology
https://www.readbyqxmd.com/read/29259491/effects-of-fertility-preservation-in-patients-with-breast-cancer-a-retrospective-two-centers-study
#16
Tomoko Hashimoto, Yusuke Nakamura, Ryuichiro Obata, Masakazu Doshida, Mayumi Toya, Takumi Takeuchi, Koichi Kyono
Purpose: To assess the efficacy of fertility preservation (FP) and the impact of chemotherapy on the reproductive potential of Japanese patients with breast cancer. Methods: Sixty-two patients with breast cancer visited the authors' centers from October, 2003 to June, 2015. They were divided into two groups according to the treatment: oocyte or embryo vitrification for FP before cancer treatment (group A) or infertility treatment after cancer treatment (group B)...
October 2017: Reproductive Medicine and Biology
https://www.readbyqxmd.com/read/29259476/in-vitro-maturation-of-human-immature-oocytes-for-fertility-preservation-and-research-material
#17
REVIEW
Hiromitsu Shirasawa, Yukihiro Terada
Aim: In recent years, the importance of fertility preservation (FP) has increased. In vitro maturation (IVM), an important technique in FP, has started to be used in the clinic, but controversies persist regarding this technique. Here, a survey of IVM for FP is provided. Methods: Based on a literature review, the applications of FP, methods of FP, IVM of oocytes that had been collected in vivo and ex vivo, maturation of oocytes after IVM for FP, cryopreservation of oocytes for FP, explanation of the procedures to patients, and recent research on FP using IVM were investigated...
July 2017: Reproductive Medicine and Biology
https://www.readbyqxmd.com/read/29259448/permeability-of-the-plasma-membrane-to-water-and-cryoprotectants-in-mammalian-oocytes-and-embryos-its-relevance-to-vitrification
#18
REVIEW
Keisuke Edashige
The permeability of the plasma membrane to water and cryoprotectants is one of the important factors for determining the suitable condition for the vitrification of mammalian oocytes and embryos. Water and cryoprotectants move slowly through oocytes and early embryos, principally by simple diffusion, in the mouse, bovine, pig, and human. In contrast, water, glycerol, and ethylene glycerol move rapidly through morulae and blastocysts, principally by facilitated diffusion via aquaporin 3, in the mouse and bovine; whereas, in the pig, the permeability to water and these cryoprotectants increases not at the morula stage but at the blastocyst stage and further increases at the expanded blastocyst stage...
January 2017: Reproductive Medicine and Biology
https://www.readbyqxmd.com/read/29249213/vitrification-of-bovine-embryos-followed-by-in-vitro-hatching-and-expansion
#19
J F Souza, C M Oliveira, L L Lienou, T V Cavalcante, E Alexandrino, R R Santos, A P R Rodrigues, C C Campello, J R Figueiredo, F E F Dias
The objective of this study was to assess the effects of bovine embryo vitrification by applying three different vitrification solutions containing ethylene glycol (EG) and dimethylsulphoxide (DMSO) at different concentrations (10, 20 or 25% each) combined with 1.0 M glucose or 1.0 M sucrose, on the in vitro hatching and expansion rates. Healthy oocytes were selected for in vitro maturation and fertilization from 200 bovine ovaries, and subsequently cultured up to the blastocyst stage (n = 800). Control (n = 200) and vitrified cells (n = 100 per treatment; 600 in total) were cultured for an extra 24 or 48 h to evaluate hatching and expansion, respectively...
December 18, 2017: Zygote: the Biology of Gametes and Early Embryos
https://www.readbyqxmd.com/read/29242709/standardized-assessment-of-thin-film-vitrification-for-aquatic-species
#20
Nolan J Tiersch, Terrence R Tiersch
Ultra-rapid cooling under the appropriate conditions will produce vitrification, a glass-like state used to cryopreserve small sample volumes, but there are a number of major technical drawbacks impeding application of vitrification to germplasm of aquatic species. These include a lack of suitable devices, and poor reproducibility and comparability among studies due to a lack of standardization. We used 3-dimensional (3-D) printing to produce a viewing pedestal coupled with a classification system to rapidly assess frozen film quality of vitrification loops...
2017: North American Journal of Aquaculture
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