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Cryobiology

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https://www.readbyqxmd.com/read/28108309/hypoxia-enhances-the-viability-growth-and-chondrogenic-potential-of-cryopreserved-human-adipose-derived-stem-cells
#1
Wan Kamarul Zaman Wan Safwani, Jane Ru Choi, Kar Wey Yong, Iris Ting, Noor Azmi Mat Adenan, Belinda Pingguan-Murphy
Cryopreservation is the only existing method of storage of human adipose-derived stem cells (ASCs) for clinical use. However, cryopreservation has been shown to be detrimental to ASCs, particularly in term of cell viability. To restore the viability of cryopreserved ASCs, it is proposed to culture the cells in a hypoxic condition. To this end, we aim to investigate the effect of hypoxia on the cryopreserved human ASCs in terms of not only cell viability, but also their growth and stemness properties, which have not been explored yet...
January 17, 2017: Cryobiology
https://www.readbyqxmd.com/read/28093199/effect-of-different-cryo-devices-on-in%C3%A2-vitro-maturation-and-development-of-vitrified-warmed-immature-buffalo-oocytes
#2
Yelisetti Uma Mahesh, Henderson Rose Winnie Gibence, Sisinthy Shivaji, Brahmasani Sambasiva Rao
The aim of the study was to identify a cryo-device that would be best suited for the vitrification of buffalo immature cumulus-oocyte complexes (COCs) as judged by viability and meiotic competence of the vitrified-warmed oocytes and their development ability following in vitro fertilization (IVF). The expression of oocyte secreting factors and their receptors (GDF9, BMP15, BMPR2, TGFBR1) and apoptosis related genes (BCL2, BAX, P53, C-MYC) were compared in vitrified-warmed oocytes after in vitro maturation...
January 16, 2017: Cryobiology
https://www.readbyqxmd.com/read/28093198/mild-hypothermia-pretreatment-protects-hepatocytes-against-ischemia-reperfusion-injury-via-down-regulating-mir-122-and-igf-1r-akt-pathway
#3
Qi Xiao, Qi-Fa Ye, Wei Wang, Bi-Qi Fu, Zhi-Ping Xia, Zhong-Zhong Liu, Xing-Jian Zhang, Yan-Feng Wang
BACKGROUND: Mild hypothermia has been well known as an effective way to reduce ischemia reperfusion injury (IRI), while the mechanisms are still unclear. More and more evidences have indicated that miRNAs should been involved in the regulation of IRI and expecially some miRNAs have shown temp-responsiveness for temperature variation. Therefore, the role of miR-122 in mild hypothermia pretreatment after IRI was investigated. METHODS: We established a LO2 cell anoxia-reoxygenation injury model to simulate liver IRI...
January 13, 2017: Cryobiology
https://www.readbyqxmd.com/read/28082102/molecular-snapshot-of-an-intracellular-freezing-event-in-an-antarctic-nematode
#4
Michael A S Thorne, Anna Seybold, Craig Marshall, David Wharton
The Antarctic nematode, Panagrolaimus sp. DAW1 (formerly called Panagrolaimus davidi), is the best documented example of an organism able to survive intracellular ice formation in all of its compartments. Not only is it able to survive such extreme physiological disruption, but it is able to produce progeny once thawed from such a state. In addition, under slower rates, or less extreme degrees, of cooling, its body remains unfrozen and the vapour pressure difference between the supercooled body fluids and the surrounding ice leads to a process termed cryoprotective dehydration...
January 9, 2017: Cryobiology
https://www.readbyqxmd.com/read/28063961/zinc-supplementation-of-vitrification-medium-improves-in-vitro-maturation-and-fertilization-of-oocytes-derived-from-vitrified-warmed-mouse-ovaries
#5
Shirin Geravandi, Mehri Azadbakht, Mahsa Pourmoradi, Fatemeh Nowrouzi
Oocyte cryopreservation is an approach for fertility preservation for normal women and cancer patients facing chemo and radiotherapy. The present study evaluated the effect of adding zinc chloride to the vitrification medium used for whole mouse ovaries and then assessing the in vitro maturation and fertilization of oocytes when they were subsequently extracted from these vitrified ovarian tissues. Four vitrification solutions with 0, 100,150 and 200 μg/dl zinc (V0, V1, V2 and V3 respectively) were compared...
January 4, 2017: Cryobiology
https://www.readbyqxmd.com/read/28063960/effect-of-trehalose-as-an-additive-to-dimethyl-sulfoxide-solutions-on-ice-formation-cellular-viability-and-metabolism
#6
Jason Solocinski, Quinn Osgood, Mian Wang, Aaron Connolly, Michael A Menze, Nilay Chakraborty
Cryopreservation is the only established method for long-term preservation of cells and cellular material. This technique involves preservation of cells and cellular components in the presence of cryoprotective agents (CPAs) at liquid nitrogen temperatures (-196 °C). The organic solvent dimethyl sulfoxide (Me2SO) is one of the most commonly utilized CPAs and has been used with various levels of success depending on the type of cells. In recent years, to improve cryogenic outcomes, the non-reducing disaccharide trehalose has been used as an additive to Me2SO-based freezing solutions...
January 4, 2017: Cryobiology
https://www.readbyqxmd.com/read/28062180/determination-of-cryothermal-injury-thresholds-in-tissues-impacted-by-cardiac-cryoablation
#7
Ryan P Goff, Stephen G Quallich, Robert A Buechler, John C Bischof, Paul A Iaizzo
Despite widespread clinical use of cryoablation, there remain questions regarding dosing and treatment times which may affect efficacy and collateral injury. Dosing and treatment times are directly related to the degree of cooling necessary for effective lesion formation. Human and swine atrial, ventricular, and lung tissues were ablated using two cryoablation systems with concurrent infrared thermography. Post freeze-thaw samples were cultured and stained to differentiate viable and non-viable tissue. Matlab code correlated viability staining to applied freeze-thaw thermal cycles, to determine injury thresholds...
January 3, 2017: Cryobiology
https://www.readbyqxmd.com/read/28057448/improved-cryotolerance-and-developmental-competence-of-human-oocytes-matured-in-vitro-by-transient-hydrostatic-pressure-treatment-prior-to-vitrification
#8
Ruihuan Gu, Yun Feng, Song Guo, Shen Zhao, Xiaowei Lu, Jing Fu, Xiaoxi Sun, Yijuan Sun
BACKGROUND: At present, the metaphase II (MII) oocytes have a very special structure that leads to complex difficulties associated with its vitrification, and their efficacy still needs a large amount of study to observe. The present study was to investigate whether transient hydrostatic pressure (THP), which was utilized for oocytes before vitrification, had positive effect on the oocytes' developmental ability and reactive oxygen species, and had no damage on meiotic spindle, zona pellucida, and DNA copy number...
January 2, 2017: Cryobiology
https://www.readbyqxmd.com/read/28048968/supplementing-rooster-sperm-with-cholesterol-loaded-cyclodextrin-improves-fertility-after-cryopreservation
#9
Napapach Chuaychu-Noo, Pachara Thananurak, Vibantita Chankitisakul, Thevin Vongpralub
Little is known about the effects of Cholesterol-Loaded Cyclodextrin (CLC) on post-thaw semen quality in chicken. The aim of the present study is to investigate the efficacy of CLC levels (0, 1, 2 and 3 mg/mL Schramm diluent) on post-thawed semen quality and fertility in two breeds of chicken Pradu Hang Dum (native chicken) and Rhode Island Red. Semen samples of each breed were pooled, divided into 4 aliquots and diluted with Schramm diluents, cooled to 5 °C when DMF was added (6% of final volume). Semen straws were subjected to cryopreservation using the liquid nitrogen vapor method...
December 31, 2016: Cryobiology
https://www.readbyqxmd.com/read/28042051/l-carnitine-is-a-survival-factor-for-chilled-storage-of-rooster-semen-for-a-long-time
#10
A Fattah, M Sharafi, R Masoudi, A Shahverdi, V Esmaeili
Rooster sperm is sensitive to cooling, which restricts procedures to store sperms for extended periods of time for artificial insemination of commercial flocks. This study was conducted to evaluate the suitability of adding L-carnitine (LC) to chilled-storage of rooster sperm and its effects on sperm quality parameters and its fertility potential during storage at 5 °C. Pooled semen from roosters were divided into six equal aliquots and diluted with media supplemented with different concentrations of LC (0, 0...
December 29, 2016: Cryobiology
https://www.readbyqxmd.com/read/28042050/novel-technical-strategies-to-optimize-cryopreservation-of-goat-semen-using-cholesterol-loaded-cyclodextrin
#11
Vianney M Salmon, Pierre Leclerc, Janice L Bailey
Artificial insemination is well-established in dairy cattle, with sires housed in commercial studs for processing. In some species, however, sires located on-farm are used for artificial insemination by shipping their semen to an off-site laboratory for processing within 24 h of collection. To expedite semen transport from the farm to laboratory, protocols must be uncomplicated. For goat semen, an obstacle is the seminal plasma, which must be removed because it contains proteins that impede sperm quality. Our objective is to develop a simple strategy to transiently store goat semen for 24 h prior to freezing...
December 29, 2016: Cryobiology
https://www.readbyqxmd.com/read/28040489/use-of-antioxidants-reduce-lipid-peroxidation-and-improve-quality-of-crossbred-ram-sperm-during-its-cryopreservation
#12
Mohamad Naiem Banday, Farooz Ahmad Lone, Fabiha Rasool, Muzamil Rashid, Arif Shikari
Ram sperm are subjected to extreme oxidative stress during their preservation at -196 °C resulting in reduced quality at post thaw. Therefore, the main objective of this study was to evaluate the effect of antioxidants taurine, quercetin and reduced glutathione on the post thaw quality of crossbred ram sperm. A total of twenty four ejaculates from six crossbred rams were collected and extended with tris-based extender with no antioxidant (Control), with taurine (40 mM), quercetin (5 μg/ml) and reduced glutathione (5 mM)...
December 28, 2016: Cryobiology
https://www.readbyqxmd.com/read/27988168/dna-methylation-and-histone-deacetylation-regulating-insulin-sensitivity-due-to-chronic-cold-exposure
#13
Xiaoqing Wang, Lai Wang, Yizheng Sun, Ruiping Li, Jinbo Deng, Jiexin Deng
In this study, we investigated the causal relationship between chronic cold exposure and insulin resistance and the mechanisms of how DNA methylation and histone deacetylation regulate cold-reduced insulin resistance. 46 adult male mice from postnatal day 90-180 were randomly assigned to control group and cold-exposure group. Mice in cold-exposure group were placed at temperature from -1 to 4 °C for 30 days to mimic chronic cold environment. Then, fasting blood glucose, blood insulin level and insulin resistance index were measured with enzymatic methods...
December 14, 2016: Cryobiology
https://www.readbyqxmd.com/read/27988167/does-parmelina-tiliacea-lichen-photosystem-ii-survive-at-liquid-nitrogen-temperatures
#14
Abdallah Oukarroum, Mohamed El Gharous, Reto J Strasser
Parmelina tiliacea lichens kept in the wet and dry state were stored in liquid nitrogen for 1 week and the subsequent recovery of their photosynthetic apparatus was followed. The chlorophyll a fluorescence rise and the maximum quantum yield of primary photochemistry φPo (FV/FM) were analysed for this purpose. Storage of wet thalli for 1 week in liquid nitrogen led to an impairment of photosystem II and probably the photosynthetic apparatus as a whole, from which the thalli did not recover over time. Thalli exposed in the dry state thalli were far less affected by the treatment and recovered well...
December 14, 2016: Cryobiology
https://www.readbyqxmd.com/read/27956223/the-effect-of-cryopreservation-on-anti-cancer-activity-of-human-amniotic-membrane
#15
Khashayar Modaresifar, Sara Azizian, Maryam Zolghadr, Hamideh Moravvej, Abolhassan Ahmadiani, Hassan Niknejad
Human amniotic membrane (AM) is an appropriate candidate for treatment of cancer due to special properties, such as inhibition of angiogenesis and secretion of pro-apoptotic factors. This research was designed to evaluate the impact of cryopreservation on cancer cell death induction and anti-angiogenic properties of the AM. Cancer cells were treated with fresh and cryopreserved amniotic condition medium during 24 h and cancer cell viability was determined by MTT assay. To evaluate angiogenesis, the rat aorta ring assay was performed for both fresh and cryopreserved AM within 7 days...
December 9, 2016: Cryobiology
https://www.readbyqxmd.com/read/27956222/effects-of-trehalose-vitrification-and-artificial-oocyte-activation-on-the-development-competence-of-human-immature-oocytes
#16
Zhiguo Zhang, Tianjuan Wang, Yan Hao, Fazil Panhwar, Zhongrong Chen, Weiwei Zou, Dongmei Ji, Beili Chen, Ping Zhou, Gang Zhao, Yunxia Cao
Sucrose and trehalose are conventional cryoprotectant additives for oocytes and embryos. Ethanol can artificially enhance activation of inseminated mature oocytes. This study aims to investigate whether artificial oocyte activation (AOA) with ethanol can promote the development competence of in vitro matured oocytes. A total of 810 human immature oocytes, obtained from 325 patients undergoing normal stimulated oocyte retrieval cycles, were in vitro maturated (IVM) either immediately after collection (Fresh group n = 291)) or after being vitrified as immature oocytes (Vitrified group n = 519)...
December 9, 2016: Cryobiology
https://www.readbyqxmd.com/read/27956221/ethylene-glycol-and-glycerol-loading-and-unloading-in-porcine-meniscal-tissue
#17
Talal A Takroni, Hana Yu, Leila Laouar, Adetola B Adesida, Janet A W Elliott, Nadr M Jomha
The development of a long-term storage method for meniscus, a complex tissue of the knee prone to injury, would improve the procedure and outcomes of meniscus transplantation. Cryopreservation uses cryoprotective agents (CPAs) including ethylene glycol (EG) and glycerol to preserve a variety of live tissues, and understanding of the CPA permeation kinetics will be critical in designing a vitrification protocol for meniscus. The purpose of this preliminary study was to understand the loading and unloading behaviours of EG and glycerol in meniscus by observing their efflux...
December 9, 2016: Cryobiology
https://www.readbyqxmd.com/read/27940283/effects-of-cryopreservation-on-the-epigenetic-profile-of-cells
#18
REVIEW
A Chatterjee, D Saha, H Niemann, O Gryshkov, B Glasmacher, N Hofmann
Effective cryopreservation protocols are essential for long-term storage of cells and their subsequent clinical application. Freezing protocols are generally considered as safe; however, putative effects on epigenetic marks have not yet been studied in detail. While post-thaw cell survival rates have been used to evaluate the success of cryopreservation protocols, increasing evidence suggests that freezing may be associated with deviations from the physiological epigenetic marks with putative long-term effects on the cells and/or their derivatives...
December 9, 2016: Cryobiology
https://www.readbyqxmd.com/read/27919740/metabolic-differences-between-cold-stored-and-machine-perfused-porcine-kidneys-a-1-h-nmr-based-study
#19
Jay Nath, Tom B Smith, Kamlesh Patel, Sam R Ebbs, Alex Hollis, Daniel A Tennant, Christian Ludwig, Andrew R Ready
Hypothermic machine perfusion (HMP) and static cold storage (SCS) are the two methods used to preserve deceased donor kidneys prior to transplant. This study seeks to characterise the metabolic profile of HMP and SCS porcine kidneys in a cardiac death donor model. Twenty kidneys were cold flushed and stored for two hours following retrieval. Paired kidneys then underwent 24 h of HMP or SCS or served as time zero controls. Metabolite quantification in both storage fluid and kidney tissue was performed using one dimensional (1)H NMR spectroscopy...
December 3, 2016: Cryobiology
https://www.readbyqxmd.com/read/27916562/cryobiological-parameters-of-multipotent-stromal-cells-obtained-from-different-sources
#20
L Lauterboeck, W F Wolkers, B Glasmacher
Stem cells are important for regenerative medicine mainly due to their multilineage differentiation capacity. However, the cells rapidly loose this capability during culturing. Cryopreservation preserves the differentiation potential of the cells, until they are needed. In this study, specific cell properties of multipotent stromal cells (MSCs), from the common marmoset monkey Callithrix jacchus MSCs derived from amnion (Am) and bone marrow (Bm) were studied in order to predict optimal cooling rates for cryopreservation...
December 2, 2016: Cryobiology
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