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Cryobiology

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https://www.readbyqxmd.com/read/28716599/maintaining-viability-and-characteristics-of-cholangiocarcinoma-tissue-by-vitrification-based-cryopreservation
#1
Min Zeng, Qiu-Rui Yang, Gong-Bo Fu, Yuan Zhang, Xu Zhou, Wei-Jian Huang, Hong-Dan Zhang, Wei-Jian Li, Zhen-Yu Wang, He-Xin Yan, Bo Zhai
Tumor tissue has great clinical and scientific value which relies highly on the proper preservation of primary materials. Conventional tumor tissue cryopreservation using slow-freezing method has yielded limited success, leading to significant cell loss and morphological damage. Here we report a standardized vitrification-based cryopreservation method, by which we have successfully vitrified and warmed 35 intrahepatic cholangiocarcinoma (ICC) tissues with up to 80% viability of the fresh tumor tissues. Cryopreserved ICC tissue could generate patient-derived xenografts (PDXs) with take rates of 68...
July 14, 2017: Cryobiology
https://www.readbyqxmd.com/read/28716598/effect-of-lecithin-nanoliposome-or-soybean-lecithin-supplemented-by-pomegranate-extract-on-post-thaw-flow-cytometric-microscopic-and-oxidative-parameters-in-ram-semen
#2
Mahdieh Mehdipour, Hossein Daghigh Kia, Maryam Nazari, Abouzar Najafi
This investigation was carried out to study the effect of soybean lecithin 1.5% (wt/vol) (0, 2.5, 5 and 7.5 mg l(-1) pomegranate extract (PE)) or PE-loaded lecithin nanoliposome (0, 2.5, 5 and 7.5 mg l(-1)) to Tris-based extender. Sperm motility (CASA), viability, membrane integrity (HOS test), abnormalities, mitochondrial activity, apoptosis status, lipid peroxidation, total antioxidant capacity (TAC)) and antioxidant activities (GPX, SOD) were investigated following freeze-thawing. No significant differences (P < 0...
July 14, 2017: Cryobiology
https://www.readbyqxmd.com/read/28716597/cells-isolated-from-cryopreserved-dental-follicle-display-similar-characteristics-to-cryopreserved-dental-follicle-cells
#3
Hefeng Yang, Jie Li, JingJing Sun, Weihua Guo, Hui Li, Jinglong Chen, Yu Hu, Weidong Tian, Song Li
Dental follicle tissue is a promising resource of mesenchymal stem cells for cytotherapeutic approaches and tissue engineering applications. There are two procedures for banking of human dental follicle stem cells have been reported. Conventional method requires cell isolation, expansion and immediate cryopreservation. Whereas dental follicle stem cells can be isolated from cryopreserved dental follicle fragments. The aim of this study was to compare the characteristics of dental follicle cells isolated from cryopreserved fragments (DFCs-CF) with dental follicle cells recovered from cryopreserved cells (DFCs-CC)...
July 14, 2017: Cryobiology
https://www.readbyqxmd.com/read/28716596/quality-comparison-of-umbilical-cord-blood-cryopreserved-with-conventional-versus-automated-systems
#4
Kyeong Mi Kim, Ji Young Huh, Jin Ju Kim, Myung Seo Kang
Umbilical cord blood (CB) banks usually freeze and store CB for clinical transplantation using conventional controlled-rate freezer or the automated BioArchive system. The aim of this study is to compare the quality of CB cryopreserved with conventional and automated methods and to make clear the cause of the quality difference between the two methods. The experiment used 80 CB units: 40 were conventionally cryopreserved and the remainder were cryopreserved with a BioArchive. After thawing, the following measures of CB quality were compared: recovery rates of cell count, cell viability of total nucleated cells (TNCs), mononuclear cells (MNCs), and CD34+ cells, as well as colony-forming unit-granulocyte/macrophage (CFU-GM) content...
July 14, 2017: Cryobiology
https://www.readbyqxmd.com/read/28697988/the-addition-of-reduced-glutathione-to-cryopreservation-media-induces-changes-in-the-structure-of-motile-subpopulations-of-frozen-thawed-boar-sperm
#5
Efrén Estrada, Maria M Rivera Del Álamo, Joan E Rodríguez-Gil, Marc Yeste
Adding cryopreservation media with reduced glutathione (GSH) has previously been shown to maintain the motility, membrane integrity and fertilizing ability of frozen-thawed boar sperm, although the effects of GSH on good (GFE) and poor freezability (PFE) ejaculates rely upon the intrinsic ejaculate freezability. The resilience to withstand freeze-thawing procedures has previously been related to the existence of a specific distribution of motile sperm subpopulations, which differs between GFE and PFE. Thus, the main aim of this study was to determine whether the addition of GSH to freezing media has any impact on the distribution of motile sperm subpopulations in GFE and PFE...
July 8, 2017: Cryobiology
https://www.readbyqxmd.com/read/28693953/cryopreservation-of-luciola-praeusta-kiesenwetter-coleoptera-lampyridae-embryos-by-vitrification
#6
Kang Li, Xuanli Chen, Xiaoling Song, Xi Wu, Yi Xian
There is an urgent need to preserve the ever-decreasing number of different species of fireflies all over the world. We sought to develop a vitrification procedure to cryopreserve the firefly embryos. The late stages of Luciola praeusta Kiesenwetter embryos were collected. Several impermeable and permeable protectants with various concentrations in different mediums (TNM-FH insect medium, Grace's medium, Dulbecco's Modification of Eagle's Medium (DMEM) and Dulbecco's Phosphate-Buffered Saline (DPBS)) was used...
July 7, 2017: Cryobiology
https://www.readbyqxmd.com/read/28668447/effect-of-cryopreservation-on-viability-and-growth-efficiency-of-stromal-epithelial-cells-derived-from-neonatal-human-thymus
#7
Valentin P Shichkin, Oleksandr I Gorbach, Olga A Zuieva, Nataliia I Grabchenko, Irina A Aksyonova, Boris M Todurov
The thymus is the major site of T lymphocyte generation and so is critical for a functional adaptive immune system. Since, thymectomy is a component of neonatal surgery for congenital heart diseases, it provides great potential for collection and storage of thymic tissue for autologous transplantation. However, specific investigation into the optimum parameters for thymic tissue cryopreservation have not been conducted. In this research, we evaluated the effect of different cryoprotective media compositions, which included penetrating (Me2SO, glycerol) and non-penetrating (dextran-40, sucrose, hydroxyethyl starch) components, on the viability and functionality of frozen-thawed human thymic samples to select an optimal cryoprotective medium suitable for long-term storage of thymic tissue and a stromal-epithelial enriched population...
June 28, 2017: Cryobiology
https://www.readbyqxmd.com/read/28645681/thermal-thresholds-of-cardiovascular-hl-1-cell-destruction-by-cryothermal-exposure
#8
Jeunghwan Choi, John Bischof
The use of thermal based therapies for treatment of atrial fibrillation is increasing [2,9]. While numerous reports are available in the literature regarding the efficacy of cryotherapy on pulmonary vein survival, there are no reports specifically at the cellular level that establish thermal thresholds and mechanisms of cellular destruction. The current article reports on the response of HL-1 cardiomyocytes to cooling rates and end temperatures during cryothermal exposure. The focus is on establishment of in vitro thresholds while also establishing mechanisms of action due to biophysical events (i...
June 20, 2017: Cryobiology
https://www.readbyqxmd.com/read/28645680/collection-processing-and-freezing-of-equine-bone-marrow-cells
#9
Fernanda Z Bastos, Fernanda C M Barussi, Thasla F Santi, Bianca P Vieira, Alexandra C Senegaglia, Fernanda F Cruz, Pedro V Michelotto
There is no consensus on aspects of equine bone marrow collection and processing. The study aimed to describe the collection of large volumes of bone marrow from horses of advanced age, with emphasis on bone marrow mononuclear cells (BMMCs) recovery and viability after cryopreservation. Fourteen horses, aged 3-24 years, were divided into three experiments. E1 studied the feasibility of collecting 200 mL from the sternums of horses of advanced age; E2 examined the number of cells obtained from the first and last syringe of each puncture; and E3 investigated the influence of heparin concentration on the prevention of cell aggregation, and cell viability after freezing in liquid nitrogen...
June 20, 2017: Cryobiology
https://www.readbyqxmd.com/read/28641947/effectiveness-of-human-spermatozoa-biomarkers-as-indicators-of-structural-damage-during-cryopreservation
#10
María José Gómez-Torres, Llanos Medrano, Alejandro Romero, Pedro José Fernández-Colom, Jon Aizpurúa
Human spermatozoa cryopreservation techniques are used to maintain and protect male fertility in cases such as infertility and malignancy treatments. However, during cryopreservation, the spermatozoa's metabolic rate is reduced and they undergo dramatic functional and structural changes owing to exposure to cryoprotectants and freezing-thawing procedures. While the effects of cryopreservation on cells are documented, to date the induced cryodamage on structural and/or functional sperm biomarkers is not well established at multivariate scale...
June 19, 2017: Cryobiology
https://www.readbyqxmd.com/read/28600082/regulation-of-pyruvate-kinase-in-skeletal-muscle-of-the-freeze-tolerant-wood-frog-rana-sylvatica
#11
Michael B Smolinski, Jessica J L Mattice, Kenneth B Storey
The wood frog (Rana sylvatica) can survive the winter in a frozen state, in which the frog's tissues are also exposed to dehydration, ischemia, and anoxia. Critical to wood frog survival under these conditions is a global metabolic rate depression, the accumulation of glucose as a cryoprotectant, and a reliance on anaerobic glycolysis for energy production. Pyruvate kinase (PK) catalyzes the final reaction of aerobic glycolysis, generating pyruvate and ATP from phosphoenolpyruvate (PEP) and ADP. This study investigated the effect of each stress condition experienced by R...
June 16, 2017: Cryobiology
https://www.readbyqxmd.com/read/28602769/methodology-for-reliable-and-reproducible-cryopreservation-of-human-cervical-tissue
#12
James M Fox, Rebecca C Wiggins, John W J Moore, Christine Brewer, Alison C Andrew, Fabiola Martin
BACKGROUND: In order to conduct laboratory studies on donated cervical tissue at suitable times an effective and reliable cryopreservation protocol for cervical tissue is required. METHODS: An active freezing approach was devised utilising 10% dimethyl sulfoxide in foetal bovine serum as a cryoprotective agent with a cooling rate of 1 °C/min to -50 °C then 10 °C/min to -120 °C; a related thawing protocol was also optimised which would allow for the bio-banking of cervical tissue...
June 9, 2017: Cryobiology
https://www.readbyqxmd.com/read/28602768/effects-of-ultrasound-on-permeation-of-cryoprotectants-into-japanese-whiting-sillago-japonica-embryos
#13
Sheikh Mustafizur Rahman, Carlos Augusto Strüssmann, Toru Suzuki, Sullip Kumar Majhi, Ricardo Shohei Hattori, Md Ariful Alam
Cryopreservation of fish embryos requires the swift uptake of considerable amounts of cryoprotectant (CPA) but this process is hampered by the low permeability of the egg chorion. This study examined the relative efficiency of ultrasound to promote the incorporation of CPAs in two different embryonic developmental stages (somites and tail elongation) of Japanese whiting Sillago japonica and performed a preliminary cryopreservation trial using the best conditions determined during the study. Embryos tolerated ultrasound densities up to 37...
June 8, 2017: Cryobiology
https://www.readbyqxmd.com/read/28596081/vitamin-k2-improves-developmental-competency-and-cryo-tolerance-of-in%C3%A2-vitro-derived-ovine-blastocyst
#14
Fatemeh Sefid, S Ostadhosseini, S M Hosseini, F Ghazvini Zadegan, M Pezhman, Mohammad Hossein Nasr Esfahani
Vitamin K2 (VK2), acts as an electron carrier in mitochondria and thereby effects reactive oxygen species (ROS) and ATP production. This study evaluates role of VK2 on in vitro developmental competency and cryo-survival of pre-implantation ovine embryos. Initially the optimal and beneficial concentration of VK2 on compaction and blastocyst formation rates was defined (0.1 μM). Subsequently, it was shown that 0.1 μM VK2, at blastocyst stage, reduces H2O2 production, increase the expression of mitochondrial related gene and improved embryos quality...
June 6, 2017: Cryobiology
https://www.readbyqxmd.com/read/28564580/the-death-pathways-in-mussel-larval-cells-after-a-freeze-thaw-cycle
#15
Nelly A Odintsova, Andrey V Boroda, Mariia A Maiorova, Konstantin V Yakovlev
We analyzed cell viability, caspase activity, plasma membrane alterations and cell ultrastructure morphology to estimate the morphological and biochemical alterations that occur in bivalve molluscan cell cultures during cryopreservation. The use of 5% dymethyl sulfoxide as a cryoprotectant resulted in greater cell survival and a scarcity of destroyed cells lacking cytosol among dead cells. In this case, almost all cells died through necrosis or apoptosis, which appeared to increase in mussel cell cultures after a freeze-thaw cycle...
May 28, 2017: Cryobiology
https://www.readbyqxmd.com/read/28552273/intracellular-trehalose-via-transporter-tret1-as-a-method-to-cryoprotect-cho-k1-cells
#16
Tsutomu Uchida, Maho Furukawa, Takahiro Kikawada, Kenji Yamazaki, Kazutoshi Gohara
Trehalose is a promising natural cryoprotectant, but its cryoprotective effect is limited due to difficulties in transmembrane transport. Thus, expressing the trehalose transporter TRET1 on various mammalian cells may yield more trehalose applications. In this study, we ran comparative cryopreservation experiments between the TRET1-expressing CHO-K1 cells (CHO-TRET1) and the CHO-K1 cells transfected with an empty vector (CHO-vector). The experiments involve freezing under various trehalose concentrations in an extracellular medium...
May 25, 2017: Cryobiology
https://www.readbyqxmd.com/read/28545999/a-comparative-analysis-of-the-efficacy-of-three-cryopreservation-protocols-on-the-survival-of-in%C3%A2-vitro-derived-cattle-embryos-at-pronuclear-and-blastocyst-stages
#17
Van Huong Do, Simon Walton, Sally Catt, Andrew W Taylor-Robinson
The effectiveness of three cryopreservation protocols (slow freezing, short equilibration vitrification and long equilibration vitrification) on in vitro-derived cattle embryos at expanded blastocyst and pronuclear stages was compared. 199 expanded blastocysts of good quality were assigned randomly into four treatment groups [control, non-cryopreserved (fresh, unfrozen); and the three cryopreservation methods]. The re-expansion of the cryopreserved blastocysts after 24 h in vitro culture was similar to that of the fresh control group...
May 22, 2017: Cryobiology
https://www.readbyqxmd.com/read/28522355/closed-versus-open-vitrification-for-human-blastocyst-cryopreservation-a-meta-analysis
#18
Hyun Sik Youm, Jong-Ryeol Choi, Daesik Oh, Yong Ho Rho
Closed vitrification can minimize the risk of microbiological transmission through liquid nitrogen during the cooling, storage, and warming procedures. As cooling rates may reduce when closed vitrification is applied, clinical outcomes should be compared between closed and open vitrification in order to justify the use of closed vitrification. This study was conducted to investigate the differences in survival, implantation, clinical pregnancy, and live birth rates between closed and open vitrification for human blastocyst cryopreservation...
May 15, 2017: Cryobiology
https://www.readbyqxmd.com/read/28502527/effects-of-different-sucrose-concentrations-on-vitrified-porcine-preantral-follicles-qualitative-and-quantitative-analysis
#19
Paula Rocío Gabriel, Pablo Torres, María Celeste Fratto, Humberto Cisale, Juan Alberto Claver, Daniel Marcelo Lombardo, María Laura Fischman
The aim of the present study was to perform a qualitative and quantitative analysis of the effect of different sucrose concentrations combined with ethylene glycol in the preservation of vitrified porcine preantral follicles. Fragments of ovarian cortex were vitrified in cryotubes containing 200 μl of the vitrification solution (30% Ethylene Glycol; 20% Fetal Bovine Serum; 0 M-0.25 M - 0.75 M or 1 M sucrose) and stored in liquid nitrogen for a week. Histological analysis showed that after vitrification the number of normal follicles decreased compared to the fresh tissue (control)...
May 11, 2017: Cryobiology
https://www.readbyqxmd.com/read/28502526/long-term-preservation-of-eri-and-ailanthus-silkworms-using-frozen-gonads
#20
Hisayoshi Fukumori, Jung Lee, Tsuguru Fujii, Zenta Kajiura, Yutaka Banno
Cryopreservation of eri and ailanthus silkworms using frozen gonads was investigated. First, we evaluated the freeze tolerance of ovary and testis in the eri silkworm, which showed high tolerance. Mating between frozen ovary-transplanted females and frozen testis-transplanted males produced 163.0 eggs, yielding 105.7 larvae per moth. In a second experiment, we tested the use of the eri silkworm as a host insect for gonad transplantation from ailanthus silkworm donors. A high success ratio for laid and hatched eggs was demonstrated for ovary transplantation (97...
May 11, 2017: Cryobiology
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