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Cryobiology

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https://www.readbyqxmd.com/read/29908947/isochoric-vitrification-an-experimental-study-to-establish-proof-of-concept
#1
Yanfang Zhang, Gideon Ukpai, Alexandra Grigoropoulos, Matthew J Powell-Palm, Bradley P Weegman, Michael J Taylor, Boris Rubinsky
Ice-free vitreous cryopreservation (vitrification) is regarded as the principal method for avoiding ice crystallization damage in cryopreserved tissues and organs. We previously established the fundamental thermodynamics of isochoric (constant volume) systems for cryopreservation, and now extend this novel approach to vitrification in an isochoric system. This was achieved by measuring pressure changes in a 2 ml isochoric chamber containing a variety of aqueous solutions of the ubiquitous cryoprotective additives (CPA), dimethyl sulfoxide (Me2 SO) and Propane-diol...
June 14, 2018: Cryobiology
https://www.readbyqxmd.com/read/29908946/effects-of-cryopreservation-on-chimeric-antigen-receptor-t-cell-functions
#2
Hao Xu, Wenyue Cao, Liang Huang, Min Xiao, Yang Cao, Lei Zhao, Na Wang, Jianfeng Zhou
Chimeric antigen receptor T (CART) cell therapy has emerged as a potentially curative "drug" for cancer treatment. Cryopreservation of CART cells is necessary for their clinical application. Systematic studies on the effects of cryopreservation on the antitumor function of CART cells are lacking. Therefore, we compared the phenotypes and functions of CART cells that were cryopreserved during ex vivo expansion with those of freshly isolated populations. T cells expressing an anti-B-cell-maturation-antigen (BCMA) chimeric antigen receptor (CAR) were expanded in vitro for 10 days and then cryopreserved...
June 14, 2018: Cryobiology
https://www.readbyqxmd.com/read/29908142/vitrification-of-domestic-cat-felis-catus-ovarian-tissue-effects-of-three-different-sugars
#3
Danielle C Brito, Sheyla F S Domingues, Ana Paula R Rodrigues, José R Figueiredo, Regiane R Santos, Júlio C Pieczarka
We aimed to evaluate the effect of three extracellular cryoprotectants on the morphology of vitrified feline preantral follicles. Feline ovarian fragments (0.5 × 2 × 2 mm) collected from five domestic adult cats subjected to ovariohysterectomy for routine castration were vitrified with ethylene glycol (EG) 40% combined or not with sucrose (0.1 or 0.5 M), trehalose (0.1 or 0.5 M), or raffinose (0.1 M). After vitrification using the solid-surface method and warming of the tissues, cryoprotectants were washed out of the ovarian tissues, which were fixed for histological analysis...
June 13, 2018: Cryobiology
https://www.readbyqxmd.com/read/29890126/renal-cryoablation-multidisciplinary-collaborative-and-perspective-approach
#4
REVIEW
Mohamed Ismail, Tommy Kjærgaard Nielsen, Brunolf Lagerveld, Julien Garnon, David Breen, Alexander King, Marco van Strijen, Francis X Keeley
Renal cryoablation is becoming an established treatment option for small renal masses. It allows preservation of renal function without compromising cancer control. The technique has evolved considerably since it was first reported using liquid nitrogen over 20 years ago. We describe the modern technique for both laparoscopic and image guided renal cryoablation. Renal cryoablation is performed either laparoscopically or percutaneously depending on tumour characteristics. Common features include biopsy of the mass, protection of adjacent organs, and the use of compressed argon gas for freezing and helium for thawing...
June 8, 2018: Cryobiology
https://www.readbyqxmd.com/read/29886118/refrigerated-storage-of-european-common-frog-rana-temporaria-oocytes
#5
Victor K Uteshev, Edith N Gakhova, Ludmila I Kramarova, Natalia V Shishova, Svetlana A Kaurova, Robert K Browne
Reproduction technologies (RTs) for the storage and use of amphibian gametes have rapidly developed since the recognition of the amphibian conservation crisis in the late 20th Century. Of these RTs, the refrigerated storage of oocytes and sperm can help to achieve reliable pair-matching when unexpected deaths could lead to critical gaps in studbook programs, and also to enable gamete transport between facilities or when sampled from field populations. Viable sperm can be reliably stored in vitro in testes, as suspensions in refrigerators for weeks and in situ in refrigerated carcasses for days...
June 7, 2018: Cryobiology
https://www.readbyqxmd.com/read/29885288/effects-of-different-diluents-cryoprotective-agents-and-freezing-rates-on-sperm-cryopreservation-in-epinephelus-akaara
#6
Jae Yeon Ahn, Jung Yeol Park, Han Kyu Lim
We investigated various factors, including cryoprotective agents (CPAs), diluents, and freezing rates, to develop an optimal cryopreservation protocol for Epinephelus akaara sperm. In experiments using 10% dimethyl sulfoxide (DMSO), glycerol, and methanol with various diluents, 10% DMSO and 300 mM glucose yielded the highest post-thaw sperm motility. The combination of 10% glycerol and 300 mM sucrose yielded significantly higher post-thaw sperm motility than did combinations using other diluents. Glycerol and DMSO at a concentration of 10% as CPAs with 300 mM glucose as the diluent resulted in the highest MSR and sperm activity index (SAI)...
June 6, 2018: Cryobiology
https://www.readbyqxmd.com/read/29864412/cryopreservation-induces-mitochondrial-permeability-transition-in-a-bovine-sperm-model
#7
Favián Treulen, María Elena Arias, Luis Aguila, Pamela Uribe, Ricardo Felmer
When the mitochondria of somatic cells are exposed to pathological calcium overload, these trigger mitochondrial permeability transition (MPT) leading to mitochondrial dysfunction and cell death. Cryopreservation procedures expose mammalian spermatozoa to physical and chemical stressors, which affect plasma membrane integrity and induce a pathological calcium overload that gradually promotes loss of sperm quality and ultimately function. Although several studies highlight the role of calcium in many physiological and pathological processes, the MPT induced by an intracellular calcium increase and its effect on the cell quality of mammalian spermatozoa are unknown...
June 1, 2018: Cryobiology
https://www.readbyqxmd.com/read/29852130/development-of-molecular-markers-for-zebrafish-danio-rerio-ovarian-follicle-growth-assessment-following-in-vitro-culture-in-cryopreservation-studies
#8
Siji Anil, David Rawson, Tiantian Zhang
Development of in vitro culture protocol for early stage ovarian follicles of zebrafish is important since cryopreserved early stage ovarian follicles would need to be matured in vitro following cryopreservation before they can be fertilised. Development of molecular markers for zebrafish (Danio rerio) ovarian follicle growth assessment following in vitro culture of early stage zebrafish ovarian follicles in ovarian tissue fragments is reported here for the first time although some work has been reported for in vitro culture of isolated early stage zebrafish ovarian follicles...
May 28, 2018: Cryobiology
https://www.readbyqxmd.com/read/29842869/effect-of-vitrification-on-human-oocyte-maturation-rate-during-in-vitro-maturation-procedure-a-systematic-review-and-meta-analysis
#9
REVIEW
Mehdi Mohsenzadeh, Amin Salehi-Abargouei, Nasim Tabibnejhad, Mojgan Karimi-Zarchi, Mohammad Ali Khalili
Combination of in vitro maturation (IVM) and cryopreservation offers new opportunities for women with contraindication in ovarian stimulation, and females who desire to postpone the childbearing due to different problems. There are still controversies regarding IVM procedure and its impact on oocytes fertilization capability. This systematic review and meta-analysis were conducted to evaluate the impact of vitrification on human oocyte maturation rate during IVM procedure. In this review, we searched Medline, Embase, Scopus and ISI web of science to identify English-language studies...
May 26, 2018: Cryobiology
https://www.readbyqxmd.com/read/29752974/a-study-of-cryogenic-tissue-engineered-liver-slices-in-calcium-alginate-gel-for-drug-testing
#10
Ruomeng Chen, Bo Wang, Yaxiong Liu, Rong Lin, Jiankang He, Dichen Li
To address issues such as transportation and the time-consuming nature of tissue-engineered liver for use as an effective drug metabolism and toxicity testing model, "ready-to-use" cryogenic tissue-engineered liver needs to be studied. The research developed a cryogenic tissue-engineered liver slice (TELS), which comprised of HepG2 cells and calcium alginate gel. Cell viability and liver-specific functions were examined after different cryopreservation and recovery culture times. Then, cryogenic TELSs were used as a drug-testing model and treated with Gefitinib...
May 9, 2018: Cryobiology
https://www.readbyqxmd.com/read/29742450/gas-exchange-measurement-as-a-non-destructive-viability-assay-for-frozen-thawed-winter-dormant-apple-buds
#11
C Vogiatzi, E Rosenqvist, B W W Grout
Low temperature studies with winter-dormant buds are severely limited by the lack of a rapid,non-destructive assay for their viability. Investigations involving the winter harvest of ecodormant buds of woody subjects, including cryopreservation, are restricted if viability cannot be assessed until dormancy is broken. If post-treatment grafting indicates low survival of the harvested population then further collection and study has to be delayed until the next winter season. This study trials the use of a portable gas exchange system able to discriminate between live and dead buds rapidly, with the assay confirmed as non-destructive by subsequent micropropagation...
May 6, 2018: Cryobiology
https://www.readbyqxmd.com/read/29723505/phenotypic-changes-and-dna-methylation-status-in-cryopreserved-seeds-of-rye-secale-cereale-l
#12
Jie Lu, Stephanie Greene, Scott Reid, Von Mark V Cruz, David A Dierig, Patrick Byrne
Conserving genetic diversity is a major priority of the National Laboratory for Genetic Resources Preservation (NLGRP), operated by the U.S. Department of Agriculture, Agricultural Research Service. There are two long-term preservation methods employed in the NLGRP: storage in a -18 °C freezer (conventional storage) and storage in liquid nitrogen vapor phase at -135 to -180 °C (cryopreservation). To test the phenotypic and epigenetic effects of long-term cryopreservation of orthodox seeds, we evaluated 40 cereal rye accessions (20 spring habit and 20 winter habit) stored for 25 years under both conventional storage and cryogenic conditions...
April 30, 2018: Cryobiology
https://www.readbyqxmd.com/read/29715451/cell-surface-damage-and-morphological-changes-in-oenococcus-oeni-after-freeze-drying-and-incubation-in-synthetic-wine
#13
Bárbara Mercedes Bravo-Ferrada, Sónia Gonçalves, Liliana Semorile, Nuno C Santos, Natalia S Brizuela, E Elizabeth Tymczyszyn, Axel Hollmann
The aim of the present study was to evaluate the effects of freeze-drying in the presence of trehalose as a cryoprotectant, followed by incubation in synthetic wine, on surface damage, viability and l-malic acid consumption of the oenological strain Oenococcus oeni UNQOe 73.2. After freeze-drying, no significant differences were observed in the number of viable cells (for both acclimated and non-acclimated cultures) respect to the fresh culture. In contrast, loss of viability was observed after wine incubation for 24 h, being acclimated freeze-dried cells the best conditions for this...
June 2018: Cryobiology
https://www.readbyqxmd.com/read/29684325/the-effect-of-isochoric-freezing-on-mammalian-cells-in-an-extracellular-phosphate-buffered-solution
#14
J Preciado, B Rubinsky
Isochoric (constant volume) freezing has been recently suggested as a new method for cell and organ preservation. As a first step in studying the effect of isochoric freezing on mammalian cells, Madin-Darby canine kidney epithelial cells (MDCK), were frozen in an isochoric system, in a simple extracellular phosphate buffered solution to -10 °C (96.5 MPa), - 15 °C (162 MPa) and -20 °C (205 MPa) for 60 and 120 min. Cell membrane integrity and cell metabolism were studied with a Live/Dead cell vitality assay and flow cytometry...
June 2018: Cryobiology
https://www.readbyqxmd.com/read/29680230/percutaneous-ablative-cryoimmunotherapy-for-micrometastaic-abscopal-effect-no-complications
#15
Erik Soule, Mark Bandyk, Jerry Matteo
Recent studies have shown efficacy of nivolumab, a monoclonal antibody specific for an immunoregulatory protein termed programmed death 1 (PD-1), against metastatic renal cell carcinoma. PD-1 is a transmembrane protein expressed on T cells that suppresses activation upon binding to its ligands, which may be secreted paraneoplastically by various cancers. Inhibition of PD-1 signaling via nivolumab may sensitize tumor-specific T lymphocytes in the immunosuppressive tumor microenvironment. Systemic elimination of micrometastases requires robust activation and proliferation of tumor antigen stimulated T cells...
June 2018: Cryobiology
https://www.readbyqxmd.com/read/29679551/histological-and-mechanical-evaluation-of-antifreeze-peptide-afp1m-cryopreserved-skin-grafts-post-transplantation-in-a-rat-model
#16
S M Ibrahim, O H Kareem, K M Saffanah, A A Adamu, M S Khan, M B A Rahman, M M Noordin, M Y Loqman
The objective of this study was to evaluate the use of Afp1m as a cryopreservative agent for skin by examining the transplanted skin histological architecture and mechanical properties following subzero cryopreservation. Thirty four (34) rats with an average weight of 208 ± 31 g (mean ± SD), were used. Twenty four (n = 24) rats were equally divided into four groups: (i) immediate non-cryopreserved skin autografts (onto same site), (ii) immediate non-cryopreserved skin autografts (onto different sites), (iii) skin autografts cryopreserved with glycerol for 72 h and (iv) skin autografts cryopreserved with Afp1m for 72 h at -4 °C...
June 2018: Cryobiology
https://www.readbyqxmd.com/read/29679550/ct-guided-percutaneous-cryoablation-for-palliative-therapy-of-gastric-cancer-liver-metastases
#17
Xu Chang, Yan Wang, Hai-Peng Yu, Wei-Hao Zhang, Xue-Ling Yang, Zhi Guo
OBJECTIVE: Liver metastases occur in approximately 4%-14% of gastric cancer patients and are associated with high mortality. However, no standardized treatment approach is available for these patients. We aimed to assess the clinical outcomes of patients with gastric cancer liver metastases (GCLM) who underwent percutaneous cryoablation. METHODS: We retrospectively enrolled 19 patients with 27 metastatic hepatic tumors who underwent cryoablation for liver metastases after gastrectomy for primary gastric cancer...
June 2018: Cryobiology
https://www.readbyqxmd.com/read/29678467/effect-of-achillea-millefolium-loaded-nanophytosome-in-the-post-thawing-sperm-quality-and-oxidative-status-of-rooster-semen
#18
Davood Najafi, Ramezan Ali Taheri, Abouzar Najafi, Abbas Abbas Rouhollahi, Manuel Alvarez-Rodriguez
The aim of this study was to compare the effectiveness of antioxidants including Achillea millefolium extract (AmE) (n0t1.5: 1.5, n0t3: 3 and n0t4.5: 4.5 mg/L) and AmE loaded in nano phytosome (n1t1.5: 1.5, n1t3: 3 and n1t4.5: 4.5 mg/L) in the freezing of Ross 308 rooster semen. Sperm motility (CASA), membrane integrity (HOS test), viability, total abnormality and enzymatic parameters (SOD, CAT and GPx) were assessed after thawing. AmE-loaded nano phytosome at a concentration of 3 mg/l resulted in significantly (P < 0...
June 2018: Cryobiology
https://www.readbyqxmd.com/read/29673757/the-effects-of-cryoprotectants-on-sperm-motility-of-the-chinese-pearl-oyster-pinctada-fucata-martensii
#19
Xing Zheng, Zhifeng Gu, Zhiwei Huang, Haifeng Ding, Hebert Ely Vasquez, Yibing Liu, Yaohua Shi, Aimin Wang
Cryopreservation has been widely employed to preserve genetic material of aquatic animals. Although of common use in bivalves, resulting effects due to the toxicity of the cryoprotectants dimethyl sulfoxide (DMSO), propanediol (PG), methanol (MET) and ethylene glycol (EG), upon sperm motility in the Chinese pearl oyster, Pinctada fucata martensii, has remained undocumented. This study endeavors to identify the least toxic among the effective cryoprotectant agents by observing and comparing their toxic effects on sperm motility under varying concentrations and duration of exposure...
June 2018: Cryobiology
https://www.readbyqxmd.com/read/29665384/cryopreservation-of-sperm-bundles-spermatozeugmata-from-endangered-livebearing-goodeids
#20
Yue Liu, Leticia Torres, Terrence R Tiersch
More than half of fishes in the family Goodeidae are considered to be endangered, threatened, or vulnerable. Sperm cryopreservation is an effective tool for conserving genetic resources of imperiled populations, but development of protocols with livebearing fishes faces numerous challenges including the natural packaging of sperm into bundles. In this study the cryopreservation of sperm bundles (spermatozeugmata) of three goodeids species was evaluated. Sperm quality was evaluated by activation with NaCl-NaOH solution (at 300 mOsmol/kg and pH 11...
June 2018: Cryobiology
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