 |
|||
|
ABSTRACT ARCHIVE |
|||
|
|||
|
|
 |
|
|
|
CryoLetters is a bimonthly, international journal for low temperature science and technology |
|
|
||||||||||||||||||||||||||||||||||||||||
|
CryoLetters 40 (4), 200-208 (2019) PROTECTION BY GLYCEROL, SUCROSE AND TREHALOSE FOR ACELLULAR HUMAN DERMIS AGAINST GAMMA IRRADIATION DAMAGE AT -78.5°C Wendell Q. Sun Institute of Biomedical Technology, School of Medical Instrument and Food Engineering, University of Shanghai for Science and Technology, Shanghai, China. Abstract BACKGROUND: Glycerol, sucrose and trehalose are used as protectants for membrane, protein, cell and tissue preservation. The undercooled state (glassy or rubbery) of their solutions may also offer protection for protein, cells and tissues against radiation damage upon sterilization. OBJECTIVE: The present study aimed to examine the protective effects of glycerol, sucrose and trehalose on cryopreserved acellular human dermis against gamma irradiation damage. MATERIALS AND METHODS: Acellular human dermis was cryopreserved at -80° C in glycerol, sucrose and trehalose solutions or their combinations with a base citrate-phosphate buffer (pH 6.0). Cryopreserved acellular dermis was then subjected to 13 kGy gamma irradiation at -78.5aC, and radiation damage was assessed by histological evaluation. RESULTS: Freeze and thaw alone do not alter the structure of acellular dermis, but gamma irradiation at -78.5° C results in significant structural changes in acellular dermis, including the formation of large holes, the damage of collagen fibers and the loss of overall dermis tissue histology. The incorporation of glycerol, sucrose and trehalose into cryopreservation solutions reduces gamma irradiation-induced tissue structural damage considerably. When used alone, trehalose (0.5 M) provided better protection against gamma irradiation damage than did sucrose (0.5 M) and glycerol (1.0 M). When used in combination, the glycerol/trehalose combination provides the best tissue protection. Significant donor-to-donor variation exists in tissue damage after gamma irradiation. For donor dermis that is less sensitive to gamma irradiation damage, glycerol, sucrose or trehalose alone is able to provide good protection. However, for more sensitive donor dermis, only the glycerol/trehalose combination is able to provide sufficient tissue protection. CONCLUSION: Glycerol, sucrose and trehalose protects cryopreserved acellular human dermis against gamma irradiation damage. Cryopreservation solutions can be optimized to permit tissues for gamma sterilization to increase the safety human tissue implants. Keywords: cryopreservation, gamma irradiation, acellular dermis, glycerol, sucrose, trehalose.
CryoLetters 40 (4), 209-218 (2019) PREDICTION OF CRYOPROTECTANT PERMEATION INTO ARTICULAR CARTILAGE: A MODEL SUITABLE FOR SEVERAL CRYOPROTECTIVE AGENTS Xiaoyi Yu* and Guangming Chen Ningbo Institute of Technology, Zhejiang University, Ningbo, China Abstract BACKGROUND: Understanding the spatiotemporal distribution characteristics of cryoprotectant concentration in the cartilage tissue during loading is essential for the rational design of the loading procedure and the successful cryopreservation of articular cartilage (AC). OBJECTIVE: To construct a diffusion mass transfer model to describe the permeation of cryoprotectant into AC. MODEL CONSTRUCTION: The model was based on the binary diffusion thermodynamic model to correlate the effective diffusion coefficient with the infinite dilution diffusion coefficient. The activity coefficient was estimated using the UNIFAC model. The concentration dependence of the diffusion coefficient was expressed using the Vignes formula, and the infinite dilution diffusion coefficient was calculated using the Siddiqi-Lucas correlation. RESULTS: For dimethyl sulfoxide (Me2SO), glycerol (GLY), ethylene glycol (EG) and propylene glycol (PG), the coefficient of determination and mean relative error of the average cryoprotectant concentration in the cartilage tissue calculated by the model and experimental values reported in the literature are 0.959–0.998 and 0.98–15.19%, respectively, for Me2SO; 0.990–0.995 and 13.56–19.19% for GLY; 0.969–0.988 and 8.89–22.09% for EG; and 0.971–0.992 and 5.35–23.76% for PG. CONCLUSION: The developed model could be used for these four widely used cryoprotectants to directly predict the spatiotemporal distribution of cryoprotectant concentration in the cartilage tissue during loading. Keywords: mass transfer, diffusion, articular cartilage, cryoprotectant, UNIFAC, cryopreservation
CryoLetters 40 (4), 219-225 (2019) Rosmarinus officinalis ESSENTIAL OIL PRELOADED IN Β-CYCLODEXTRIN: EFFECT ON RAM SPERMATOZOA MOTILITY, MEMBRANE INTEGRITY AND OXIDATIVE STATUS DURING 4°C STORAGE A. Benberkane 1*, A. Khellouf 1, K. Benhenia 2, 1Associated Laboratory in Marine Ecosystems and Aquaculture, Department of Biological Sciences of the Environment, Faculty of Nature and Life Sciences, Abderrahmane Mira
University, Route de Targua Ouzemmour, 06000 Bejaia Algeria. Abstract BACKGROUND: Rosmarinus officinalis essential oil (Rom) has been reported recently to be of interest for use in sperm cryopreservation. However, related to its lipophilic characteristics, encapsulation in cyclodextrin could enhance Rom positive effects by increasing its solubility in sperm extenders. OBJECTIVE: To compare the effect of Rom preloaded in hydroxypropyl- β-cyclodextrin (Rom-cd) to Rom alone (Rom) on ram sperm conserved at 4°C. MATERIALS AND METHODS: Ram epididymal sperm was collected from six testes. Each collected sperm was split into four equal aliquots. The control aliquot was diluted with Tris extender (Tris + citric acid + fructose + penicillin), two aliquots were treated with Rom at 0.5 μl ml-1 and 1 μl ml-1 respectively, and one aliquot treated with Rom-cd at 1 μl ml-1. All sperm aliquots were analyzed for motility after 0, 2, 4, 24 and 48 h of storage at 4°C using a Computer Aided Semen Analysis (CASA). Membrane integrity and oxidative stress status were measured after 48 h of storage. RESULTS: The results indicated that motility parameters were best preserved in the extender containing Rom-cd compared to the groups treated by Rom without cyclodextrin. Rom alone resulted to higher sperm motility than the control group. Lower oxidative stress and more cell membrane protection were observed in Rom treated samples, especially when using Rom-cd. CONCLUSION: The ability of Rom to protect ram sperm against cryopreservation damages was improved after encapsulation in hydroxypropyl-β-cyclodextrin (HPβCD). Keywords: ram sperm, cryopreservation, Rosmarinus officinalis, essential oil, β-cyclodextrin, solubility.
CryoLetters 40 (4), 226-230 (2019) THE VIABILITY OF SERVAL (Leptailurus serval) AND PALLAS CAT (Felis manul) OOCYTES AFTER CRYOPRESERVATION USING THE RAPID-I METHOD. Agnieszka Nowak1, Joanna Kochan1 *, Sylwia Prochowska2, 1 University of Agriculture in Krakow, Faculty of Animal Sciences, Institute of Veterinary Sciences, al. Mickiewicza 21, 30-120 Krakow, Poland. Abstract BACKGROUND: Vitrification by Rapid-I method could be essential for felid rescue programs to protect wild felid in the future. OBJECTIVE: This study was aimed at adapting the Rapid I method and evaluating the viability of serval and Pallas cat oocytes compared to oocytes of the domestic cat. MATERIALS AND METHODS: Oocytes after collection and in vitro maturation were vitrified using Cryotech medium (Cryotech, Japan) and a Rapid-I device (Vitrolife, Sweden). To evaluate viability, oocytes after warming were stained with fluorescein diacetate and ethidium bromide. RESULTS: Survival rate in the control group (domestic cat) was 75 %. In the experimental group, 70% (serval) and 60% (pallas cat) viable oocytes were found. CONCLUSION: The Rapid-I method can be applied successfully for the vitrification of wild felid oocytes. Keywords: wild felids, oocyte, Rapid-I, vitrification, bio-bank
CryoLetters 40 (4), 231-236 (2019) IN VITRO AND IN VIVO EFFICIENCY OF EXTENDERS ADDED TO THAWED STALLION SEMEN Felipe Augusto Boudoux Martins Sales1, José Carlos Ferreira-Silva1, 1 Laboratório de Biotécnicas Reprodutivas, Universidade Federal Rural de Pernambuco, Recife-PE, Brasil. Abstract BACKGROUND: Addition of extenders to thawed semen could improve fertility. OBJECTIVE: To determine the efficiency of extenders to increase viability of thawed semen, measured by sperm parameters in vitro and pregnancy rates after artificial insemination (AI). MATERIALS AND METHODS: Sperm motility and acrosin activity were measured during a thermoresistance test (TRT). RESULTS: Progressive motility decreased (P<0.05) after 30 min in thawing semen treated with saline solution (SS) and only after 60 min with Tyrode's solution (TS) or freezing diluent (FD). The total motility decreased (P<0.05) after 60 min in thawed semen treated with SS, and after 90 min in thawed semen containing TS or FD. The acrosin activity decreased (P<0.05) after 60 min during the TRT, but there was no difference among treatments throughout the TRT. The pregnancy rates were similar among thawed-semen supplemented with SS, TS or FD. CONCLUSION: The extenders neither improve sperm parameters nor enhance AI results. Keywords: equine, cryopreservation, post-diluent, motility, acrosin, fertility.
CryoLetters 40 (4), 237-246 (2019) CRYOPRESERVATION OF IN VITRO-GROWN SHOOT TIPS OF THE MEDICINAL SPECIES Cleome spinosa (Cleomaceae) APPLYING VITRIFICATION-BASED TECHNIQUES Anna Flávia Rodrigues Mortani Vilardo1*, Thaís Fortunato Mendonça1, 1 Laboratório de Biotecnologia de Plantas (LABPLAN) - Núcleo de Biotecnologia Vegetal (NBV) - Universidade do Estado do Rio de Janeiro (UERJ). Rua São Francisco Xavier, 524,
PHLC, sala 509, Maracanã, CEP 20550-013 - Rio de Janeiro, RJ, Brazil. Abstract BACKGROUND: Few cryopreservation studies have been reported with the genus Cleome. Due to the use of C. spinosa in traditional medicine and its valuable pharmacological potential, the long-term conservation of the species will allow the safe maintenance of its germplasm. OBJECTIVE: This study compares two vitrification-based techniques on the cryopreservation of shoot tips of C. spinosa. MATERIALS AND METHODS: The effect of sucrose preculture and different vitrification solutions was evaluated using vitrification and V Cryo-plate techniques. The supplementation of recovery medium with BAP was also assessed. RESULTS: The V Cryo-plate proved to be the most efficient technique. Treatment of shoot tips with PVS2 at 0°C resulted in a higher regeneration response after cryopreservation when compared to treatment with PVS2 and PVS3 at 25°C. The highest survival (83.3%) and recovery (76.6%) were achieved for shoot tips exposed to PVS2 for 90 min at 0°C and recovered on MS medium supplemented with 0.5 mg L−1 BAP for 2 weeks. CONCLUSION: Plants regenerated from cryopreserved shoot tips maintained their in vitro multiplication capacity and showed a normal phenotypic aspect, demonstrating the efficiency of the cryopreservation protocol. Keywords: BAP, long-term conservation, PVS, shoot tips, vitrification, V Cryo-plate.
CryoLetters 40 (4), 247-256 (2019) VAPOUR PRESSURE ABOVE THE GLASSY TREHALOSE SOLUTION AND GLASS RELAXATION Shaozhi Zhang a,b, Xiao Niu a, Gengsheng Huang a, a Key Laboratory of Refrigeration and Cryogenic Technology of Zhejiang Province, Institute of Refrigeration and Cryogenics, Zhejiang University, Hangzhou, P.R. China. Abstract BACKGROUND: Data are scarce on thermophysical properties of the glassy trehalose solution at low temperatures. OBJECTIVE: Water vapor pressure above the glassy trehalose solution and the relaxation behavior were studied at temperatures from -57°C to -40°C and at concentrations from 71% to 78% (w/w). MATERIALS AND METHODS: Glassy trehalose solutions were prepared by quenching in liquid nitrogen. Vapour pressure was measured using the static method. RESULTS: Vapour pressure above the glassy trehalose solution was slightly lower than above the glassy sucrose solution. The relaxation of the glassy state can be described by the stretched exponential Kohlrausch-Williams-Watts (KWW) function. The characteristic times of water relaxation (τp) were compared with those of enthalpy relaxation (τe). When the difference (ΔT) between the glass transition temperature (Tg) and ageing temperature was relatively small, i.e. ΔT ≤ 10 K, τp is close to τe. If ΔT ≥ 15 K, τe will be much greater than τp. CONCLUSION: The difference of water vapor pressure above the trehalose glassy solution and sucrose glassy solution could lead to significant distinction between their drying kinetics. Keywords: glass ageing, glass relaxation, trehalose solution, vapour pressure, water activity. |
|||||||||||||||||||||||||||||||||||||||||
|
|
|
|
|
|
|
|
|
|||||||||||||||||||||||
|
Abstracts |
|||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||
|
For Abstracts published from meetings, such as SLTB meetings, go to the
relevant Volume Year of the journal (above). For Full text Free Access Content (from 2000 onwards) go to CryoLetters at Ingenta and look for the blue symbol. |
|||||||||||||||||||||||||||
