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Vitrification

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https://www.readbyqxmd.com/read/27925012/effect-of-nac-on-mouse-gv-oocyte-survival-and-subsequent-embryonic-development-following-vitrfication
#1
S L Yue, Y T Zhang, S W Wang, M Sun, Y C Xing, J Wen, J B Zhou
BACKGROUND: Oocytes that survive cryopreservation may accumulate ROS which are known to bring harmful effects on embryonic development. NAC is an antioxidant which can be a supplement to reduce oxidative stress. However, whether NAC can improve the developmental competence of vitrified GV-oocytes remains unclear. OBJECTIVE: The study was to investigate the effect of NAC on subsequent embryonic developmental competence of mice vitrified GV-oocytes. MATERIALS AND METHODS: This study compared the effects of different concentration of NAC on the cleavage and blastocyst rates of mice vitrified GV-oocytes...
July 2016: Cryo Letters
https://www.readbyqxmd.com/read/27925008/ros-induced-oxidative-stress-in-nobile-type-dendrobium-protocorm-like-bodies-plbs-during-vitrification
#2
M Jia, W Di, Yan Liu, Yin Shi, Y Xie
BACKGROUND: Oxidative stress involved in cryopreservation protocols may be responsible for the poor survival of tissues after cryopreservation. OBJECTIVE: In the current study, we aimed to clarify the role of oxidative stress and its relationship with survival rate during cryopreservation of PLBs from nobile-type Dendrobium. MATERIALS AND METHODS: ROS, antioxidants and oxidative products and the survival rate in PLBs from Dendrobium Hamanal Lake Dream were determined during vitrification...
July 2016: Cryo Letters
https://www.readbyqxmd.com/read/27925006/cryopreservation-of-adventitious-roots-of-cleome-rosea-vahl-cleomaceae-using-a-vitrification-technique-and-assessment-of-genetic-stability
#3
L Da Silva Cordeiro, C Simoes-Gurgel, N Albarello
BACKGROUND:  Cleome rosea, a Brazilian native species, has medicinal potential. Previously a cryopreservation protocol for in vitro roots using the vitrification solution PVS2 has been developed. However, the genetic stability of the cryopreserved material is yet to be assessed. OBJECTIVES: To evaluate the effects of loading and vitrification solutions (PVS2 and PVS3) on post-cryopreservation recovery of C. rosea roots, and to assess their genetic stability using Random Amplified Polymorphic DNA (RAPD) markers...
July 2016: Cryo Letters
https://www.readbyqxmd.com/read/27925004/appropriate-osmotic-balance-duration-for-different-volumes-of-ovarian-tissue-in-vitrification-solution-a-study-of-ovary-tissue-vitrification-and-transplantation-in-sheep
#4
L Dang, X Zheng, Q Chang, Y Yang, Y Wang, Y Cai, C Hei, H Wang, C Zhao, W Zhu, Y Wang
:   BACKGROUND: Auto-transplantation of cryopreserved ovarian tissue has become a promising method for fertility preservation and standardization of the process is crucial for practical applications. OBJECTIVE: Here we used different size of large sheep ovarian cortex to study the most suitable osmotic balance durations in the vitrification solution for large piece ovary cortex. MATERIALS AND METHODS: The ovarian cortices from six-month old female sheep were divided into 40 cubic mm, 80 cubic mm and 160 cubic mm volume, A two-step osmotic balance method was used based on the results from morphological and histological study, we detected the expression of VEGF after thawing, the percentage of follicles that survived and serum E2 levels,together with apoptosis test by TUNEL...
September 2016: Cryo Letters
https://www.readbyqxmd.com/read/27925001/dehydration-preparation-of-mouse-sperm-for-vitrification-and-rapid-laser-warming
#5
E Paredes, P Mazur
BACKGROUND: Mice are fundamental models of study due to their ease of breeding, manipulation, and the well-studied genome. There has been extensive research focused on the cryopreservation of mouse germaplasm, as a way to help maintain the different transgenic mouse breeds. The first protocols for mouse sperm were developed in the 90's using slow cooling and a mixture of raffinose and glycerol. Since then, the rate of success reported remains highly variable. OBJECTIVE: The Aim of this work is to study factors that are key for developing vitrification protocols for ultra-rapid laser warming of mouse sperm...
September 2016: Cryo Letters
https://www.readbyqxmd.com/read/27923412/effects-of-vitrification-on-blastomere-viability-and-cytoskeletal-integrity-in-mouse-embryos
#6
Zenon Oikonomou, Katerina Chatzimeletiou, Antonia Sioga, Louisa Oikonomou, Basil C Tarlatzis, Efstratios Kolibianakis
Vitrification is widely used to cryopreserve supernumerary embryos following in vitro fertilization (IVF). The mouse model was used to investigate the effects of vitrification on blastomere viability, using viability markers, and on the cytoskeleton, by analysing spindle/chromosome configurations, using confocal scanning microscopy. Ninety cleavage and morula stage dimethyl sulphoxide (DMSO)/EG vitrified mouse embryos were either processed immediately following warming for viability assessment by labelling with the fluorescent markers carboxyfluorescein-diacetate succinimidylester (CFSE) and propidium iodide (PI) or were cultured to the blastocyst stage and immunostained with α-tubulin antibody to visualize microtubules and DAPI or PI to visualize DNA...
December 7, 2016: Zygote: the Biology of Gametes and Early Embryos
https://www.readbyqxmd.com/read/27922944/oocyte-vitrification-for-elective-fertility-preservation-the-past-present-and-future
#7
Vinay Gunnala, Glenn Schattman
PURPOSE OF REVIEW: Oocyte cryopreservation is no longer experimental and one of its rapidly growing indications is elective fertility preservation. Currently there is no sufficient evidence to support its practice and therefore its place in IVF remains uncertain. RECENT FINDINGS: Vitrification has superior post-thaw survival and fertilization outcomes compared with oocytes that were frozen with the slow-freeze technique. Oocyte vitrification produces similar IVF outcomes compared with fresh oocytes and is not associated with further obstetrical or perinatal morbidity...
December 5, 2016: Current Opinion in Obstetrics & Gynecology
https://www.readbyqxmd.com/read/27908686/effect-of-different-vitrification-solutions-and-cryodevices-on-viability-and-subsequent-development-of-buffalo-oocytes-vitrified-at-the-germinal-vesicle-gv-stage
#8
Amr S El-Shalofy, Adel R Moawad, Gamal M Darwish, Sayed T Ismail, Aly B A Badawy, Magdy R Badr
The cryopreservation of immature oocytes would generate a readily available, non-seasonal source of female gametes for research and reproduction. In domestic animals, the most promising results on oocyte cryopreservation have been reported in cattle, few studies have been conducted on buffalo. The aim of the present study was to compare the use of different vitrification solutions and various cryodevices on viability and developmental competence of buffalo oocytes vitrified at the germinal vesicle (GV) stage...
November 28, 2016: Cryobiology
https://www.readbyqxmd.com/read/27900615/good-manufacturing-practice-requirements-for-the-production-of-tissue-vitrification-and-warming-and-recovery-kits-for-clinical-research
#9
Monica M Laronda, Kelly E McKinnon, Alison Y Ting, Ann V Le Fever, Mary B Zelinski, Teresa K Woodruff
Products that are manufactured for use in a clinical trial, with the intent of gaining US Food and Drug Administration (FDA) approval for clinical use, must be produced under an FDA approved investigational new drug (IND) application. We describe work done toward generating reliable methodology and materials for preserving ovarian cortical tissue through a vitrification kit and reviving this tissue through a warming and recovery kit. We have described the critical steps, procedures, and environments for manufacturing products with the intent of submitting an IND...
November 30, 2016: Journal of Assisted Reproduction and Genetics
https://www.readbyqxmd.com/read/27890045/protein-in-culture-and-endogenous-lipid-interact-with-embryonic-stages-in-vitro-to-alter-calf-birthweight-after-embryo-vitrification-and-warming
#10
E Gómez, S Carrocera, S Uzbekova, D Martín, A Murillo, M Alonso-Guervós, F Goyache, M Muñoz
Short-term protein removal in vitro improves long-term blastocyst competence to survive vitrification. We investigated the mechanisms and effects underlying protein removal. Day-6 morulae and early blastocysts were cultured individually with and without protein for 24h. Development and lipid content were analysed in expanded blastocysts derived from morulae (M-XB) and from early blastocysts (EB-XB). Expression of genes involved in lipid metabolism, stress responses and apoptosis was analysed in fresh and vitrified-warmed M-XB produced with and without protein...
November 28, 2016: Reproduction, Fertility, and Development
https://www.readbyqxmd.com/read/27885726/cryopreservation-of-feline-oocytes-by-vitrification-using-commercial-kits-and-slush-nitrogen-technique
#11
L Fernandez-Gonzalez, K Jewgenow
Assisted reproductive techniques are a valuable tool for conservation breeding of endangered species. Cryopreservation methods are the basis of gamete banks, supporting genetic diversity preservation. Unfortunately, cryopreservation of feline oocytes is still considered an experimental technique. The aim of this study was to compare two commercial kits, with our protocol for vitrification of cat oocytes (IZW), which comprises a three-step method with ethylene glycol, DMSO, fetal calf serum, trehalose and Ficoll PM-70...
November 24, 2016: Reproduction in Domestic Animals, Zuchthygiene
https://www.readbyqxmd.com/read/27882695/effects-of-polyethylene-glycol-and-a-synthetic-ice-blocker-during-vitrification-of-immature-porcine-oocytes-on-survival-and-subsequent-embryo-development
#12
Elisa Caroline da Silva Santos, Tamas Somfai, Ruth Appeltant, Thanh Quang Dang-Nguyen, Junko Noguchi, Hiroyuki Kaneko, Kazuhiro Kikuchi
We evaluated the effects of polyethylene glycol (PEG) and Supercool X-1000 (SC) as supplements during the vitrification of immature cumulus-enclosed porcine oocytes in a solution based on 17.5% ethylene glycol + 17.5% propylene glycol. After warming, the oocytes were subjected to in vitro maturation, fertilization and embryo culture. In Experiment 1, equilibration and vitrification solutions were supplemented with or without 2% (w/v) PEG (PEG+ and PEG-, respectively). The survival rate, cleavage and blastocyst development were similar between PEG+ and PEG- groups; however, all values were lower than those in the non-vitrified control...
November 24, 2016: Animal Science Journal, Nihon Chikusan Gakkaihō
https://www.readbyqxmd.com/read/27872720/a-comparative-study-on-the-effects-of-different-cryoprotectants-on-the-quality-of-canine-sperm-during-vitrification-process
#13
Sahar Nouri Gharajelar, Rajab Ali Sadrkhanloo, Masoud Onsori, Adel Saberivand
Cryopreservation has the capacity to extend spermatozoa's lifespan and viability. In addition, the semen samples can be collected, preserved and stored or sent to distant locations and still be used long after the death of the semen donor. In this study for the vitrification of dog sperm (fresh and swum-up sperm), different cryopreservation mediums on the basis of glycerol, milk and egg yolk were used. Then, all of the samples were vitrified in the liquid nitrogen and thawed at least 48 hr later for re-examination of sperm parameters...
2016: Veterinary Research Forum
https://www.readbyqxmd.com/read/27870915/effects-of-angiopoietin-2-on-transplanted-mouse-ovarian-tissue
#14
Hye Won Youm, Jaewang Lee, Eun Jung Kim, Hyun Sun Kong, Jung Ryeol Lee, Chang Suk Suh, Seok Hyun Kim
Transplantation of ovarian tissue (OT) is currently the only clinical option to restore fertility with cryopreserved OT. However, follicle loss caused by ischemia and slow revascularization occurs in transplanted OT. To shorten the ischemic period and promote angiogenesis, some angiogenic factors have been used. Angiopoietin-2 (Ang2) is one of the major angiogenic factors and has been reported to promote blood vessels and increase vascular permeability in ischemic and/or hypoxic environment. This study was performed to investigate the effects of Ang2 on follicle integrity and revascularization of transplanted mouse OT...
2016: PloS One
https://www.readbyqxmd.com/read/27864160/blotting-free-and-lossless-cryo-electron-microscopy-grid-preparation-from-nanoliter-sized-protein-samples-and-single-cell-extracts
#15
Stefan A Arnold, Stefan Albiez, Andrej Bieri, Anastasia Syntychaki, Ricardo Adaixo, Robb A McLeod, Kenneth N Goldie, Henning Stahlberg, Thomas Braun
We present a sample preparation method for cryo-electron microscopy (cryo-EM) that requires only 3 to 20 nanoliters of sample to prepare a cryo-EM grid, depending on the protocol used. The sample is applied and spread on the grid by a microcapillary. The procedure does not involve any blotting steps, and real-time monitoring allows the water film thickness to be assessed and decreased to an optimum value prior to vitrification. We demonstrate that the method is suitable for high-resolution cryo-EM and will enable alternative electron microscopy approaches, such as single-cell visual proteomics...
November 15, 2016: Journal of Structural Biology
https://www.readbyqxmd.com/read/27862433/different-associations-of-cryoprotectants-for-testicular-tissue-of-prepubertal-cats-submitted-to-vitrification
#16
Dbc Lima, Tfp Silva, G B Morais, A Aquino-Cortez, Jsam Evangelista, Faf Xavier Júnior, D A Viana, Ldm Silva
The cryopreservation of testicular tissue is presented as the only alternative for the preservation of genetic material from prepubertal animals. However, this biotechnology is still being tested. The objective of this study was to evaluate the effect of different associations of cryoprotectants and the potential of cell proliferation after vitrification of testicular tissue of prepubertal cats. Five testicular pairs from five prepubertal cats were used, and each pair was divided into four fragments. Of these, one fragment composed of the control group (CG) and the rest were distributed in experimental groups according to the associations of cryoprotectants to be tested (dimethyl sulphoxide (DMSO)/glycerol (GLY); ethylene glycol (EG)/GLY) or DMSO/EG) in a final cryoprotectant concentration of 5...
November 9, 2016: Reproduction in Domestic Animals, Zuchthygiene
https://www.readbyqxmd.com/read/27859772/survival-rate-after-vitrification-of-various-stages-of-cat-embryos-and-blastocyst-with-and-without-artificially-collapsed-blastocoel-cavity
#17
M Ochota, B Wojtasik, W Niżański
Embryo vitrification is a modern technique for cryopreservation in assisted reproductive programs. From all the embryos, blastocysts are the most challenging during cryostorage due to their size, multicellular structure and the presence of blastocoelic fluid. The aim of this study was to evaluate the suitability for vitrification of various developmental stages of feline embryos and the influence of the artificial shrinkage (AS) of expanded blastocyst on post-vitrification survival rates. The AS procedure is the manual puncture of the trophectoderm allowing for the reduction of blastocoelic fluid prior to vitrification and thus preventing the ice crystal formation...
November 15, 2016: Reproduction in Domestic Animals, Zuchthygiene
https://www.readbyqxmd.com/read/27859529/porcine-sperm-vitrification-ii-spheres-method
#18
C C Arraztoa, M H Miragaya, M G Chaves, V L Trasorras, M C Gambarotta, D M Neild
Owing to current problems in boar sperm cryopreservation, this study proposes to evaluate vitrification in spheres as an alternative cryopreservation procedure, comparing the use or not of permeable cryoprotectants and two warming methods. Extended (n = 3; r = 4) and raw (n = 5; r = 2) porcine spermatozoa were diluted in media, in the absence or presence of either 4% dimethylformamide or 4% glycerol, to a final concentration of 5 × 10(6)  spermatozoa/ml and vitrified using the spheres method. Two warming procedures were evaluated: a rapid method (30 s at 37°C) and an ultrarapid method (7 s at 75°C, followed by 30 s at 37°C)...
November 10, 2016: Andrologia
https://www.readbyqxmd.com/read/27847415/polyadenylated-tail-length-variation-pattern-in-ultra-rapid-vitrified-bovine-oocytes
#19
D J Dutta, Himangshu Raj, And Hiramoni Dev
AIM: Thecurrent study aims at investigating the polyadenylated (poly[A]) tail length of morphologically high and low competent oocytes at different developmental stages. Furthermore, effect of ultra-rapid vitrification on the poly(A) tail length was studied. MATERIALS AND METHODS: Fresh bovine cumulus oocyte complexes from abattoir originated ovaries were graded based on morphological characters and matured in vitro. Cryopreservation was done by ultra-rapid vitrification method...
October 2016: Veterinary World
https://www.readbyqxmd.com/read/27845423/glycine-increases-preimplantation-development-of-mouse-oocytes-following-vitrification-at-the-germinal-vesicle-stage
#20
Xin-Yan Cao, Jack Rose, Shi-Yong Wang, Yong Liu, Meng Zhao, Ming-Jie Xing, Tong Chang, Baozeng Xu
Ice-free cryopreservation, referred to as vitrification, is receiving increased attention in the human and animal assisted reproduction. However, it introduces the detrimental osmotic stress by adding and removing high contents of cryoprotectants. In this study, we evaluated the effects of normalizing cell volume regulation by adding glycine, an organic osmolyte, during vitrification of mouse germinal vesicle stage oocyte and/or subsequent maturation on its development. The data showed that glycine supplementation in either vitrification/thawing or maturation medium significantly improved the cytoplasmic maturation of MII oocytes manifested by spindle assembly, chromosomal alignment, mitochondrial distribution, euploidy rate, and blastocyst development following fertilization in vitro, compared to the control without glycine treatment...
November 15, 2016: Scientific Reports
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