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Wan HY, Chen JCH, Xiao Q, Wong CW, Yang B, Cao B, Tuan RS, Nilsson SK, Ho YP, Raghunath M, Kamm RD, Blocki A. Stabilization and improved functionality of three-dimensional perfusable microvascular networks in microfluidic devices under macromolecular crowding. Biomater Res 2023; 27:32. [PMID: 37076899 PMCID: PMC10116810 DOI: 10.1186/s40824-023-00375-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2022] [Accepted: 04/04/2023] [Indexed: 04/21/2023] Open
Abstract
BACKGROUND There is great interest to engineer in vitro models that allow the study of complex biological processes of the microvasculature with high spatiotemporal resolution. Microfluidic systems are currently used to engineer microvasculature in vitro, which consists of perfusable microvascular networks (MVNs). These are formed through spontaneous vasculogenesis and exhibit the closest resemblance to physiological microvasculature. Unfortunately, under standard culture conditions and in the absence of co-culture with auxiliary cells as well as protease inhibitors, pure MVNs suffer from a short-lived stability. METHODS Herein, we introduce a strategy for stabilization of MVNs through macromolecular crowding (MMC) based on a previously established mixture of Ficoll macromolecules. The biophysical principle of MMC is based on macromolecules occupying space, thus increasing the effective concentration of other components and thereby accelerating various biological processes, such as extracellular matrix deposition. We thus hypothesized that MMC will promote the accumulation of vascular ECM (basement membrane) components and lead to a stabilization of MVN with improved functionality. RESULTS MMC promoted the enrichment of cellular junctions and basement membrane components, while reducing cellular contractility. The resulting advantageous balance of adhesive forces over cellular tension resulted in a significant stabilization of MVNs over time, as well as improved vascular barrier function, closely resembling that of in vivo microvasculature. CONCLUSION Application of MMC to MVNs in microfluidic devices provides a reliable, flexible and versatile approach to stabilize engineered microvessels under simulated physiological conditions.
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Affiliation(s)
- Ho-Ying Wan
- Institute for Tissue Engineering and Regenerative Medicine, The Chinese University of Hong Kong, Hong Kong SAR, China
- School of Biomedical Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Jack Chun Hin Chen
- Department of Biomedical Engineering, Faculty of Engineering, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Qinru Xiao
- Department of Biomedical Engineering, Faculty of Engineering, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Christy Wingtung Wong
- Institute for Tissue Engineering and Regenerative Medicine, The Chinese University of Hong Kong, Hong Kong SAR, China
- School of Biomedical Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Boguang Yang
- Department of Orthopaedics & Traumatology, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Benjamin Cao
- Biomedical Manufacturing Commonwealth Scientific and Industrial Research Organisation (CSIRO), Melbourne, Australia
- Australian Regenerative Medicine Institute, Monash University, Melbourne, Australia
| | - Rocky S Tuan
- Institute for Tissue Engineering and Regenerative Medicine, The Chinese University of Hong Kong, Hong Kong SAR, China
- School of Biomedical Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong SAR, China
- Center for Neuromusculoskeletal Restorative Medicine (CNRM), Hong Kong Science Park, Shatin, New Territories, Hong Kong SAR, China
| | - Susan K Nilsson
- Biomedical Manufacturing Commonwealth Scientific and Industrial Research Organisation (CSIRO), Melbourne, Australia
- Australian Regenerative Medicine Institute, Monash University, Melbourne, Australia
| | - Yi-Ping Ho
- Department of Biomedical Engineering, Faculty of Engineering, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Michael Raghunath
- Institute for Chemistry and Biotechnology, Zurich University of Applied Sciences, Wädenswil, Switzerland
| | - Roger D Kamm
- Department of Biology and Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Anna Blocki
- Institute for Tissue Engineering and Regenerative Medicine, The Chinese University of Hong Kong, Hong Kong SAR, China.
- School of Biomedical Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong SAR, China.
- Department of Orthopaedics & Traumatology, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong SAR, China.
- Center for Neuromusculoskeletal Restorative Medicine (CNRM), Hong Kong Science Park, Shatin, New Territories, Hong Kong SAR, China.
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Proteomic analysis of rabbit fresh and cryopreserved semen provides an important insight into molecular mechanisms of cryoinjuries to spermatozoa. Theriogenology 2022; 191:77-95. [DOI: 10.1016/j.theriogenology.2022.07.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2021] [Revised: 07/12/2022] [Accepted: 07/25/2022] [Indexed: 11/20/2022]
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Abstract
Rabbits are an important animal species for meeting the nutritional requirements of the world's growing population due to the high conversion rate of feed. In most countries, the rabbit industry currently relies on artificial insemination with fresh or chilled and frozen-thawed spermatozoa. Various factors during the freezing process, including diluents, sperm preparation and freezing techniques, antioxidants, sudden temperature changes, ice formation and osmotic stress, have been proposed as reasons for the poor sperm quality post thaw. Despite the extensive progress reached in the field of rabbit sperm cryopreservation, new methodological approaches that could overcome problems in sperm cryopreservation are necessary. The aim of this review was to describe the factors that affect the cryopreservation of rabbit sperm.
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Viudes-de-Castro MP, Talaván AG, Vicente JS. Evaluation of dextran for rabbit sperm cryopreservation: Effect on frozen-thawed rabbit sperm quality variables and reproductive performance. Anim Reprod Sci 2021; 226:106714. [PMID: 33556752 DOI: 10.1016/j.anireprosci.2021.106714] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2020] [Revised: 01/22/2021] [Accepted: 01/23/2021] [Indexed: 12/11/2022]
Abstract
Effects were analysed of dextran supplementation to Me2SO and acetamide rabbit semen freezing extenders on quality characteristics of rabbit spermatozoa and reproductive performance. The final concentration of cryoprotectants in pooled semen samples was 12.4 % Me2SO for the A extenders, 10.7 % Me2SO and 2.9 % acetamide for the D extenders and 8.9 % Me2SO and 2.9 % acetamide in F extenders, with a supplementation of 1.7 % sucrose in all cases. There was not inclusion of dextran in the A0, D0, F0; while 5 % dextran was included in A5, D5, F5 and 10 % dextran in A10, D10 and F10 extenders. Sperm motility and viability rates were similar with use of the different extenders. Acrosome integrity after the freeze-thawing processes, however, was markedly greater when there was dextran supplementation of D and F extenders. Prolificacy was affected by extender composition. When there was artificial insemination (AI) using semen cryopreserved in the A extenders, number of kits born was similar to when there was AI with fresh semen when there was inclusion of 5% dextran for cryopreservation, while there was no effect on prolificacy when there was cryopreservation of semen using the D and F extenders. In conclusion, dextran supplementation of extenders containing Me2SO and acetamide resulted in greater acrosome integrity. Furthermore, when there was AI using sperm preserved in cryo-diluents containing an intermediate concentration of Me2SO, combined with inclusion of 5 % dextran, there was a marked beneficial effect on rabbit doe reproductive performance.
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Affiliation(s)
- María P Viudes-de-Castro
- Animal Technology and Research Center (CITA-IVIA), Polígono La Esperanza nº 100, 12400 Segorbe, Castellón, Spain.
| | - Amparo G Talaván
- Institute of Science and Animal Technology (ICTA), Universitat Politècnica de València, 46022 Valencia, Spain
| | - José S Vicente
- Institute of Science and Animal Technology (ICTA), Universitat Politècnica de València, 46022 Valencia, Spain
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5
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Improving the Rabbit Semen Cryopreservation Protocol: Comparison Between Two Extenders and Inseminating Doses. ANNALS OF ANIMAL SCIENCE 2020. [DOI: 10.2478/aoas-2020-0023] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Abstract
This study has been designed to optimize the semen freezing protocol in rabbits, in this regard we compared a Tris-citrate-glucose (TCG) extender with a commercial one (Cortalap®), that to the best of our knowledge has never been used up to now on the in vitro freezability and fertilizing ability of cryopreserved rabbit semen. Two different inseminating semen doses were considered. Five pooled semen samples were divided into two subsamples and each of them were diluted to a ratio 1:1 (v:v) with a freezing extender composed of TCG or Cortalap® containing 16% of dimethylsulfoxide and 0.1 mol/L of sucrose. The extended semen was filled into 0.25 mL plastic straws and frozen above a liquid nitrogen surface. After thawing (50°C/10 seconds) we determined sperm motility, viability, membrane functionality, acrosome and DNA integrity. Our results showed that the Cortalap® extender significantly improved the in vitro post-thaw sperm quality, in comparison to TCG. When we compared the extenders in vivo, no significant differences in the reproductive performances were observed independently by inseminating doses used. In this study we demonstrated that Cortalap® extender can be used as an alternative to TCG. Thus, the Cortalap® being a ready to use extender, implies a reduction of time, mistakes and microbial contaminations during its preparation. This discovery results as significant because it provides beyond an important contribution to the creation of the first Italian semen cryobank of rabbit breeds and also for livestock rabbit farms based on artificial insemination (AI) program.
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Di Iorio M, Rusco G, Iampietro R, Colonna MA, Zaniboni L, Cerolini S, Iaffaldano N. Finding an Effective Freezing Protocol for Turkey Semen: Benefits of Ficoll as Non-Permeant Cryoprotectant and 1:4 as Dilution Rate. Animals (Basel) 2020; 10:ani10030421. [PMID: 32138164 PMCID: PMC7143073 DOI: 10.3390/ani10030421] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2020] [Revised: 02/25/2020] [Accepted: 03/01/2020] [Indexed: 11/29/2022] Open
Abstract
Simple Summary The most adopted biotechnology for the conservation of genetic resources in avian species is semen cryopreservation. Therefore, the identification of a reference cryopreservation procedure represents a key point for ensuring the long-term conservation of genetic diversity in birds, through the implementation of a semen cryobank. In this study, our goal was to discover an effective freezing protocol for Meleagris gallopavo in order to realize the first Italian semen cryobank of autochthonous chicken and turkey breeds within our project (TuBAvI). For this purpose, we investigated the effects of three non-permeant cryoprotectants (sucrose, trehalose, and Ficoll) and two dilution rates (1:2 and 1:4) on the in vitro cryosurvivability of turkey spermatozoa. After thawing, the best semen quality was found in semen frozen in the presence of Ficoll and diluted at a final rate of 1:4. This paper provides encouraging results, however further studies are programmed to standardize the semen cryopreservation protocol. Abstract The present study aimed to find an effective cryopreservation protocol for turkey semen through the combined use of dimethylsulfoxide (DMSO) and three non-permeant cryoprotectants (NP-CPAs), sucrose, trehalose, and Ficoll 70. In addition, the action of two dilution rates (1:2 and 1:4) were also investigated. Semen was processed according to two final dilution rates and the following treatments: Tselutin extender (TE)/DMSO (control), TE/DMSO + sucrose or trehalose 50, 100, 200, or 400 mM, and TE/DMSO + Ficoll 0.5, 0.75, 1, or 1.5 mM. In total 26 different combinations treatments were achieved. The diluted semen was filled up into straws and frozen on liquid nitrogen vapor. The post-thawing sperm quality was assessed by analyzing motility, membrane integrity, osmotic resistance, and DNA integrity. The results obtained revealed a significant effect of NP-CPA concentration on total and progressive motility, on most of the kinetic parameters, on membrane integrity and DNA integrity, while the post-thaw quality was less affected by dilution rate. The highest post-thaw quality for all sperm quality parameters assessed except curvilinear velocity (VCL) and DNA integrity were found in semen frozen with 1 mM Ficoll/1:4 (p < 0.05). Our findings provide an important contribution for the identification of a reference procedure for turkey semen cryopreservation, in order to create the first national avian semen cryobank.
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Affiliation(s)
- Michele Di Iorio
- Department of Agricultural, Environmental and Food Sciences, University of Molise, 86100 Campobasso CB, Italy; (M.D.I.); (G.R.); (R.I.)
| | - Giusy Rusco
- Department of Agricultural, Environmental and Food Sciences, University of Molise, 86100 Campobasso CB, Italy; (M.D.I.); (G.R.); (R.I.)
| | - Roberta Iampietro
- Department of Agricultural, Environmental and Food Sciences, University of Molise, 86100 Campobasso CB, Italy; (M.D.I.); (G.R.); (R.I.)
| | - Maria Antonietta Colonna
- Department of Agricultural and Environmental Science, University of Bari Aldo Moro, 70126 Bari BA, Italy;
| | - Luisa Zaniboni
- Department of Veterinary Medicine, University of Milan, 20122 Milano MI, Italy;
| | - Silvia Cerolini
- Department of Veterinary Medicine, University of Milan, 20122 Milano MI, Italy;
| | - Nicolaia Iaffaldano
- Department of Agricultural, Environmental and Food Sciences, University of Molise, 86100 Campobasso CB, Italy; (M.D.I.); (G.R.); (R.I.)
- Correspondence: ; Tel.: +39 0874 404697; Fax: +39 0874 404855
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Di Iorio M, Colonna MA, Miranda M, Principe P, Schiavitto M, Cerolini S, Manchisi A, Iaffaldano N. Initial cooling time before freezing affects post-thaw quality and reproductive performance of rabbit semen. Anim Sci J 2018; 89:1240-1244. [PMID: 29856093 DOI: 10.1111/asj.13046] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2017] [Accepted: 04/12/2018] [Indexed: 11/29/2022]
Abstract
The aim of this study was to investigate the effect of initial cooling time at 5°C during semen cryopreservation on post-thaw quality and reproductive performance of rabbit semen. Pooled semen samples (n = 6) were divided into two subsamples and cooled at 5°C for 45 or 90 min. After cooling, the semen samples were diluted to a ratio of 1:1 (v:v) with a freezing extender composed of Tris-citrate-glucose (TCG) containing 16% of dimethylsulfoxide and 0.1 mol/L sucrose. The semen was subsequently loaded in 0.25 ml straws, equilibrated at 5°C and frozen in liquid nitrogen vapor. After thawing, sperm motility, viability, osmotic resistance, acrosome and DNA integrity were assessed. Our results indicate that the longer cooling time, that is, 90 min before cryopreservation significantly improves sperm post-thaw viability, motility and fertility. In fact, reproductive performances obtained with semen frozen after a 90 min cooling time were similar to those produced by fresh semen insemination. Hence, the present research provides an effective freezing protocol for rabbit semen that will allow for the creation of a sperm cryobank for the conservation of Italian rabbit genetic resources, as well as the use of frozen semen doses in commercial farms.
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Affiliation(s)
- Michele Di Iorio
- Department of Agricultural, Environmental and Food Sciences, University of Molise, Campobasso, Italy
| | | | - Marsia Miranda
- Department of Agricultural, Environmental and Food Sciences, University of Molise, Campobasso, Italy
| | - Paola Principe
- Italian Rabbit Breeders Association (ANCI-AIA), Volturara Appula (Foggia), Italy
| | - Michele Schiavitto
- Italian Rabbit Breeders Association (ANCI-AIA), Volturara Appula (Foggia), Italy
| | - Silvia Cerolini
- Department of Veterinary Medicine, University of Milan, Milan, Italy
| | - Angelo Manchisi
- Department of Agricultural, Environmental and Food Sciences, University of Molise, Campobasso, Italy
| | - Nicolaia Iaffaldano
- Department of Agricultural, Environmental and Food Sciences, University of Molise, Campobasso, Italy
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8
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Miranda M, Kulíková B, Vašíček J, Olexiková L, Iaffaldano N, Chrenek P. Effect of cryoprotectants and thawing temperatures on chicken sperm quality. Reprod Domest Anim 2017; 53:93-100. [PMID: 28891125 DOI: 10.1111/rda.13070] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2017] [Accepted: 07/29/2017] [Indexed: 11/29/2022]
Abstract
There is need for standardization of freezing-thawing protocol for rooster semen to minimize variability among results. Therefore, we aimed to compare effect of four different permeating cryoprotectants and two thawing temperatures (37 vs. 5°C) on sperm post-thaw motility and to analyse combined effect of the best permeating cryoprotectant (P-CPA) with one of four non-permeating cryoprotectants (N-CPA) on post-thaw quality of rooster semen evaluated in vitro. Pooled semen from Ross PM3 rooster heavy line was diluted in Kobidil extender and frozen in cryoprotectant solution containing 6% dimethylacetamide, 7.5% dimethylformamide, 9% N-methylacetamide or 8% ethylene glycol (EG) in liquid nitrogen vapours. To determine the best thawing rate, straws were thawed either at 37 or 5°C. Furthermore, samples were frozen in the presence of the best N-CPA either with 0.75 mol/L ficoll, 0.2 mol/L sucrose, 0.2 mol/L trehalose or 0.05 mol/L glycine. Sperm motility, membrane destabilization and viability were analysed to compare different freezing-thawing conditions. In addition, morphology and ultrastructure analysis were performed to compare fresh and frozen-thawed sperm quality. Our results indicate that the combination of EG and the thawing at 5°C improves (p ≤ .05) sperm post-thaw motility. Moreover, ficoll addition to EG-based freezing extender provided additional beneficial effect (p ≤ .05) on progressive movement and apoptosis incidence. Further work should evaluate different N-CPA concentrations to improve freezing protocol. In addition, fertility evaluation and testing on different chicken lines are needed in order to contribute to animal genetic resources bank.
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Affiliation(s)
- M Miranda
- Department of Agricultural, Environmental and Food Sciences, University of Molise, Campobasso, Italy
| | - B Kulíková
- Research Institute for Animal Production Nitra, NPPC, Lužianky, Slovak Republic
| | - J Vašíček
- Research Institute for Animal Production Nitra, NPPC, Lužianky, Slovak Republic.,Research Centre AgroBioTech, Slovak Agriculture University, Nitra, Slovak Republic
| | - L Olexiková
- Research Institute for Animal Production Nitra, NPPC, Lužianky, Slovak Republic
| | - N Iaffaldano
- Department of Agricultural, Environmental and Food Sciences, University of Molise, Campobasso, Italy
| | - P Chrenek
- Research Institute for Animal Production Nitra, NPPC, Lužianky, Slovak Republic.,Faculty of Biotechnology and Food Sciences, Slovak Agriculture University, Nitra, Slovak Republic
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Abstract
In this study, fresh and frozen-thawed semen of Nitra and Zobor rabbit breeds were evaluated for potential inter-breed or inter-male differences in sperm quality traits. Individual male semen from four rabbits of each breed were diluted (v:v; 1:1) in a freezing medium composed of a commercial diluent, 16% of dimethyl sulphoxide (DMSO), 4% of Ficoll 70 and 2% of sucrose and frozen in liquid nitrogen vapours before being plunged into liquid nitrogen. Different motility traits, viability and plasma membrane integrity of fresh and frozen-thawed semen were evaluated in vitro using computer-assisted sperm analysis and flow cytometry. To evaluate the sperm fertilization ability, artificial insemination of fresh and frozen-thawed sperm was performed. Our results showed the effect of breed (P ≤ 0.05) on frozen-thawed sperm viability and plasma membrane integrity. Moreover, individual variability in semen quality among the rabbits was revealed (0.31 to 0.71 among quality traits). Our results thereby confirmed that the cryopreservation procedure could not ensure comparable sperm post-thaw survival for different breeds or males. Nevertheless, correlations between numbers of fresh total motile and progressively moving sperm and several quality parameters measured post thawing were revealed. Therefore, we suggest that the objective assessment of fresh rabbit sperm motility may be an effective indicator of frozen-thawed semen quality. Consequently, regular semen assessment is required in order to preserve good-quality insemination doses from native breeds.
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Fujikawa T, Ando T, Gen Y, Hyon SH, Kubota C. Cryopreservation of bovine somatic cells using antifreeze polyamino-acid (carboxylated poly- l -lysine). Cryobiology 2017; 76:140-145. [DOI: 10.1016/j.cryobiol.2017.01.010] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2016] [Revised: 01/30/2017] [Accepted: 01/31/2017] [Indexed: 01/07/2023]
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Kuželová L, Vašíček J, Rafay J, Chrenek P. Detection of macrophages in rabbit semen and their relationship with semen quality. Theriogenology 2017; 97:148-153. [PMID: 28583598 DOI: 10.1016/j.theriogenology.2017.04.032] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2016] [Revised: 04/19/2017] [Accepted: 04/22/2017] [Indexed: 11/27/2022]
Abstract
We aimed at the evaluating the occurrence of macrophages in rabbit semen and finding possible relationship between macrophage concentration and spermatozoa quality. The concentration of macrophages in semen samples from broiler rabbit males of lines M91 and P91 (n = 30) without overt evidence of genital tract infections was determined using monocyte/macrophage lineage antigen CD14 and flow cytometry. Then the rabbits were assigned into three groups according to the macrophage concentration in semen (MΦ1 group with less than 1 × 106 macrophages/mL, MΦ2 group with 1.5-3.5 × 106 macrophages/mL and MΦ3 group with more than 8 × 106 macrophages/mL). Spermatozoa viability parameters such as occurrence of apoptotic (Yo-Pro-1) and dead/necrotic (propidium iodide) spermatozoa and plasma membrane integrity (PNA-Fluos) were evaluated using flow cytometry. Sperm motility parameters were determined by CASA (Computer Assisted Semen Analysis). Ultrastructural detection of macrophages was performed using transmission electron microscopy. Spermatozoa fertility potential was examined after intravaginal artificial insemination of rabbit doses. Significantly higher proportions of the apoptotic and necrotic spermatozoa and spermatozoa with lower plasma membrane integrity were revealed in the MΦ3 group compared to MΦ1 and MΦ2 groups. The percentage value of total motility and progressive movement was significantly highest in the MΦ1 group, whilst lowest in the MΦ3 group. The conception rate and the kindling rate were significantly decreased in the group with the highest macrophage concentration (MΦ3). Based on our results we can conclude that the abundance of seminal macrophages in the rabbit semen may be closely associated with poor spermatozoa quality.
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Affiliation(s)
- Lenka Kuželová
- AgroBioTech Research Centre, Slovak University of Agriculture, Tr. A. Hlinku 2, 949 76, Nitra, Slovak Republic.
| | - Jaromír Vašíček
- AgroBioTech Research Centre, Slovak University of Agriculture, Tr. A. Hlinku 2, 949 76, Nitra, Slovak Republic; Institute of Farm Animal Genetics and Reproduction, Research Institute for Animal Production in Nitra, National Agricultural and Food Centre, Lužianky, Slovak Republic.
| | - Ján Rafay
- University of Ss. Cyril and Methodius, Nám. J. Herdu 2, 917 01, Trnava, Slovak Republic.
| | - Peter Chrenek
- Institute of Farm Animal Genetics and Reproduction, Research Institute for Animal Production in Nitra, National Agricultural and Food Centre, Lužianky, Slovak Republic; Department of Biochemistry and Biotechnology, Faculty of Biotechnology and Food Science, Slovak University of Agriculture, Tr. A. Hlinku 2, 949 01, Nitra, Slovak Republic.
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Yuan Y, Yang Y, Tian Y, Park J, Dai A, Roberts RM, Liu Y, Han X. Efficient long-term cryopreservation of pluripotent stem cells at -80 °C. Sci Rep 2016; 6:34476. [PMID: 27694817 PMCID: PMC5046093 DOI: 10.1038/srep34476] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2016] [Accepted: 09/09/2016] [Indexed: 02/06/2023] Open
Abstract
Current long term cryopreservation of cell stocks routinely requires the use of liquid nitrogen (LN2), because commonly used cryopreservation media containing cell membrane permeating cryoprotectants are thermally unstable when frozen at higher storage temperatures, e.g. -80 °C. This instability leads to ice recrystallization, causing progressive loss of cell viability over time under the storage conditions provided by most laboratory deep freezers. The dependency on LN2 for cell storage significantly increases operational expense and raises issues related to impaired working efficiency and safety. Here we demonstrate that addition of Ficoll 70 to cryoprotectant solutions significantly improves system thermal stability at the working temperature (~-80 °C) of laboratory deep freezers. Moreover, a medium comprised of Ficoll 70 and dimethyl sulfoxide (DMSO) in presence or absence of fetal bovine serum (FBS) can provide reliable cryopreservation of various kinds of human and porcine pluripotent stem cells at -80 °C for periods that extend up to at least one year, with the post-thaw viability, plating efficiency, and full retention of pluripotent phenotype comparable to that achieved with LN2 storage. These results illustrate the practicability of a promising long-term cryopreservation method that completely eliminates the need for LN2.
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Affiliation(s)
- Ye Yuan
- Division of Animal Sciences and Bond Life Sciences Center; University of Missouri, Columbia, MO 65211, USA
| | - Ying Yang
- Division of Animal Sciences and Bond Life Sciences Center; University of Missouri, Columbia, MO 65211, USA
| | - Yuchen Tian
- Division of Animal Sciences and Bond Life Sciences Center; University of Missouri, Columbia, MO 65211, USA
| | - Jinkyu Park
- Division of Animal Sciences and Bond Life Sciences Center; University of Missouri, Columbia, MO 65211, USA
| | - Aihua Dai
- Division of Animal Sciences and Bond Life Sciences Center; University of Missouri, Columbia, MO 65211, USA
| | - R Michael Roberts
- Division of Animal Sciences and Bond Life Sciences Center; University of Missouri, Columbia, MO 65211, USA
| | - Yang Liu
- Department of Mechanical &Aerospace Engineering; University of Missouri, Columbia, MO 65211, USA
| | - Xu Han
- Department of Mechanical &Aerospace Engineering; University of Missouri, Columbia, MO 65211, USA.,Comparative Medicine Center, University of Missouri, Columbia, MO 65211, USA
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