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Cho JR, Yu EH, Lee HJ, Kim IH, Jeong JH, Lee DB, Cho SK, Joo JK. Ultra-Fast Vitrification: Minimizing the Toxicity of Cryoprotective Agents and Osmotic Stress in Mouse Oocyte Cryopreservation. Int J Mol Sci 2024; 25:1884. [PMID: 38339162 PMCID: PMC10856457 DOI: 10.3390/ijms25031884] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2024] [Revised: 02/02/2024] [Accepted: 02/02/2024] [Indexed: 02/12/2024] Open
Abstract
Globally, women have been adopting oocyte cryopreservation (OC) for fertility preservation for various reasons, such as inevitable gonadotoxic treatment for specific pathologic states and social preferences. While conventional vitrification (C-VIT) has improved the success rate of OC, challenges of possible toxicities of high-concentration cryoprotective agents and osmotic stress persist. To overcome these challenges, we evaluated the ultra-fast vitrification (UF-VIT) method, which reduces the equilibration solution stage exposure time compared to C-VIT by observing mouse oocyte intracellular organelles and embryonic development. Consequently, compared to fresh mouse oocytes, UF-VIT presented significant differences only in endoplasmic reticulum (ER) intensity and mitochondrial (MT) distribution. Meanwhile, C-VIT showed substantial differences in the survival rate, key ER and MT parameters, and embryonic development rate. UF-VIT exhibited considerably fewer negative effects on key MT parameters and resulted in a notably higher blastocyst formation rate than C-VIT. Meiotic spindle (spindle and chromosomes) morphology showed no significant changes between the groups during vitrification/warming (VW), suggesting that VW did not negatively affect the meiotic spindle of the oocytes. In conclusion, UF-VIT seems more effective in OC owing to efficient cytoplasmic water molecule extraction, osmotic stress reduction, and minimization of cell contraction and expansion amplitude, thus compensating for the drawbacks of C-VIT.
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Affiliation(s)
- Jung-Ran Cho
- Infertility Center of Pusan National University Hospital, Busan 49241, Republic of Korea; (J.-R.C.); (J.-H.J.); (D.-B.L.)
- Laboratory of Animal Reproductive Physiology & Biotechnology, Department of Animal Science, Pusan National University Graduate School, Miryang 50463, Republic of Korea
| | - Eun-Hee Yu
- Department of Obstetrics and Gynecology, Pusan National University School of Medicine, Pusan National University Hospital Biomedical Research Institute, Busan 49241, Republic of Korea; (E.-H.Y.); (H.-J.L.); (I.-H.K.)
| | - Hyun-Joo Lee
- Department of Obstetrics and Gynecology, Pusan National University School of Medicine, Pusan National University Hospital Biomedical Research Institute, Busan 49241, Republic of Korea; (E.-H.Y.); (H.-J.L.); (I.-H.K.)
| | - In-Hye Kim
- Department of Obstetrics and Gynecology, Pusan National University School of Medicine, Pusan National University Hospital Biomedical Research Institute, Busan 49241, Republic of Korea; (E.-H.Y.); (H.-J.L.); (I.-H.K.)
| | - Ji-Hye Jeong
- Infertility Center of Pusan National University Hospital, Busan 49241, Republic of Korea; (J.-R.C.); (J.-H.J.); (D.-B.L.)
- Laboratory of Animal Reproductive Physiology & Biotechnology, Department of Animal Science, Pusan National University Graduate School, Miryang 50463, Republic of Korea
| | - Dan-Bi Lee
- Infertility Center of Pusan National University Hospital, Busan 49241, Republic of Korea; (J.-R.C.); (J.-H.J.); (D.-B.L.)
| | - Seong-Keun Cho
- Laboratory of Animal Reproductive Physiology & Biotechnology, Department of Animal Science, Pusan National University Graduate School, Miryang 50463, Republic of Korea
| | - Jong-Kil Joo
- Department of Obstetrics and Gynecology, Pusan National University School of Medicine, Pusan National University Hospital Biomedical Research Institute, Busan 49241, Republic of Korea; (E.-H.Y.); (H.-J.L.); (I.-H.K.)
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Olver DJ, Heres P, Paredes E, Benson JD. Rational synthesis of total damage during cryoprotectant equilibration: modelling and experimental validation of osmomechanical, temperature, and cytotoxic damage in sea urchin ( Paracentrotus lividus) oocytes. PeerJ 2023; 11:e15539. [PMID: 37671360 PMCID: PMC10476611 DOI: 10.7717/peerj.15539] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2023] [Accepted: 05/21/2023] [Indexed: 09/07/2023] Open
Abstract
Sea urchins (e.g., Paracentrotus lividus) are important for both aquaculture and as model species. Despite their importance, biobanking of urchin oocytes by cryopreservation is currently not possible. Optimized cryoprotectant loading may enable novel vitrification methods and thus successful cryopreservation of oocytes. One method for determining an optimized loading protocol uses membrane characteristics and models of damage, namely osmomechanical damage, temperature damage (e.g., chill injury) and cytotoxicity. Here we present and experimentally evaluate existing and novel models of these damage modalities as a function of time and temperature. In osmomechanical damage experiments, oocytes were exposed for 2 to 30 minutes in hypertonic NaCl or sucrose supplemented seawater or in hypotonic diluted seawater. In temperature damage experiments, oocytes were exposed to 1.7 °C, 10 °C, or 20 °C for 2 to 90 minutes. Cytotoxicity was investigated by exposing oocytes to solutions of Me2SO for 2 to 30 minutes. We identified a time-dependent osmotic damage model, a temperature-dependent damage model, and a temperature and time-dependent cytotoxicity model. We combined these models to estimate total damage during a cryoprotectant loading protocol and determined the optimal loading protocol for any given goal intracellular cryoprotectant concentration. Given our fitted models, we find sea urchin oocytes can only be loaded to 13% Me2SO v/v with about 50% survival. This synthesis of multiple damage modalities is the first of its kind and enables a novel approach to modelling cryoprotectant equilibration survival for cells in general.
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Affiliation(s)
- Dominic J. Olver
- Department of Biology, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Pablo Heres
- Departamento de Ecología y Biología Animal, ECOCOST Lab, Centro de Investigación Mariña, Universidade de Vigo, Vigo, Spain
| | - Estefania Paredes
- Departamento de Ecología y Biología Animal, ECOCOST Lab, Centro de Investigación Mariña, Universidade de Vigo, Vigo, Spain
| | - James D. Benson
- Department of Biology, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
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Azam I, Benson JD. Silymarin mediated osmotic responses and damage in HepG2 cell suspensions and monolayers. Cryobiology 2023; 112:104552. [PMID: 37301358 DOI: 10.1016/j.cryobiol.2023.104552] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2023] [Revised: 05/19/2023] [Accepted: 06/07/2023] [Indexed: 06/12/2023]
Abstract
Maintenance of cells within a volume range compatible with their functional integrity is a critical determinant of cell survival after cryopreservation, and quantifying this osmotically induced damage is a part of the rational design of improved cryopreservation protocols. The degree that cells tolerate osmotic stress significantly impacts applicable cryoprotocols, but there has been little research on the time dependence of this osmotic stress. Additionally, the flavonoid silymarin has been shown to be hepatoprotective. Therefore, here we test the hypotheses that osmotic damage is time-dependent and that flavonoid inclusion reduces osmotic damage. In our first experiment, cells were exposed to a series of anisosmotic solutions of graded hypo- and hypertonicity for 10-40 min, resulting in a conclusion that osmotically induced damage is time dependent. In the next experiment, adherent cells preincubated with silymarin at the concentration of 10-4 mol/L and 10-5 mol/L showed a significant increase in cell proliferation and metabolic activity after osmotic stress compared to untreated matched controls. For instance, when adherent cells preincubated with 10-5 mol/L silymarin were tested, resistance to osmotic damage and a significant increase (15%) in membrane integrity was observed in hypo-osmotic media and a 22% increase in hyperosmotic conditions. Similarly, significant protection from osmotic damage was observed in suspended HepG2 cells in the presence of silymarin. Our study concludes that osmotic damage is time dependent, and the addition of silymarin leads to elevated resistance to osmotic stress and a potential increase in the cryosurvival of HepG2 cells.
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Affiliation(s)
- Iqra Azam
- Department of Biology, University of Saskatchewan, Canada
| | - James D Benson
- Department of Biology, University of Saskatchewan, Canada.
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4
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Impact of equilibration duration combined with temperature on the outcome of bovine oocyte vitrification. Theriogenology 2022; 184:110-123. [DOI: 10.1016/j.theriogenology.2022.02.024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2021] [Revised: 02/25/2022] [Accepted: 02/26/2022] [Indexed: 11/24/2022]
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Berteli TS, Vireque AA, Da Luz CM, Borges ED, Ferreira CR, Navarro PA. Equilibration solution composition and extended exposure to equilibration phase affect embryo development and lipid profile of mouse oocytes. Reprod Biomed Online 2022; 44:961-975. [DOI: 10.1016/j.rbmo.2022.01.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2021] [Revised: 11/25/2021] [Accepted: 01/13/2022] [Indexed: 10/19/2022]
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Park JK, Lee JH, Park EA, Lim HJ, Lyu SW, Lee WS, Kim J, Song H. Development of Optimized Vitrification Procedures Using Closed Carrier System to Improve the Survival and Developmental Competence of Vitrified Mouse Oocytes. Cells 2021; 10:cells10071670. [PMID: 34359838 PMCID: PMC8304188 DOI: 10.3390/cells10071670] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2021] [Revised: 06/28/2021] [Accepted: 06/28/2021] [Indexed: 11/16/2022] Open
Abstract
The open carrier system (OC) is used for vitrification due to its high efficiency in preserving female fertility, but concerns remain that it bears possible risks of cross-contamination. Closed carrier systems (CC) could be an alternative to the OC to increase safety. However, the viability and developmental competence of vitrified/warmed (VW) oocytes using the CC were significantly lower than with OC. We aimed to improve the efficiency of the CC. Metaphase II oocytes were collected from mice after superovulation and subjected to in vitro fertilization after vitrification/warming. Increasing the cooling/warming rate and exposure time to cryoprotectants as key parameters for the CC effectively improved the survival rate and developmental competence of VW oocytes. When all the conditions that improved the outcomes were applied to the conventional CC, hereafter named the modified vitrification/warming procedure using CC (mVW-CC), the viability and developmental competence of VW oocytes were significantly improved as compared to those of VW oocytes in the CC. Furthermore, mVW-CC increased the spindle normality of VW oocytes, as well as the cell number of blastocysts developed from VW oocytes. Collectively, our mVW-CC optimized for mouse oocytes can be utilized for humans without concerns regarding possible cross-contamination during vitrification in the future.
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Affiliation(s)
- Jae Kyun Park
- Department of Biomedical Sciences, CHA University, Seongnam 13488, Korea; (J.K.P.); (J.H.L.)
- CHA Fertility Center Gangnam, CHA University, Seoul 06125, Korea; (S.W.L.); (W.S.L.)
| | - Ju Hee Lee
- Department of Biomedical Sciences, CHA University, Seongnam 13488, Korea; (J.K.P.); (J.H.L.)
| | - Eun A Park
- CHA Fertility Center Seoul Station, CHA University, Seoul 04637, Korea;
| | - Hyunjung J. Lim
- Department of Veterinary Medicine, School of Veterinary Medicine, Konkuk University, Seoul 05029, Korea;
| | - Sang Woo Lyu
- CHA Fertility Center Gangnam, CHA University, Seoul 06125, Korea; (S.W.L.); (W.S.L.)
| | - Woo Sik Lee
- CHA Fertility Center Gangnam, CHA University, Seoul 06125, Korea; (S.W.L.); (W.S.L.)
| | - Jayeon Kim
- CHA Fertility Center Seoul Station, CHA University, Seoul 04637, Korea;
- Correspondence: (J.K.); (H.S.)
| | - Haengseok Song
- Department of Biomedical Sciences, CHA University, Seongnam 13488, Korea; (J.K.P.); (J.H.L.)
- Correspondence: (J.K.); (H.S.)
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7
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De Coster T, Velez DA, Van Soom A, Woelders H, Smits K. Cryopreservation of equine oocytes: looking into the crystal ball. Reprod Fertil Dev 2021; 32:453-467. [PMID: 32172776 DOI: 10.1071/rd19229] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2019] [Accepted: 11/14/2019] [Indexed: 12/18/2022] Open
Abstract
Invitro embryo production has evolved rapidly in the horse over the past decade, but blastocyst rates from vitrified equine oocytes remain quite poor and further research is needed to warrant application. Oocyte vitrification is affected by several technical and biological factors. In the horse, short exposure of immature oocytes to the combination of permeating and non-permeating cryoprotective agents has been associated with the best results so far. High cooling and warming rates are also crucial and can be obtained by using minimal volumes and open cryodevices. Vitrification of invivo-matured oocytes has yielded better results, but is less practical. The presence of the corona radiata seems to partially protect those factors that are necessary for the construction of the normal spindle and for chromosome alignment, but multiple layers of cumulus cells may impair permeation of cryoprotective agents. In addition to the spindle, the oolemma and mitochondria are also particularly sensitive to vitrification damage, which should be minimised in future vitrification procedures. This review presents promising protocols and novel strategies in equine oocyte vitrification, with a focus on blastocyst development and foal production as most reliable outcome parameters.
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Affiliation(s)
- Tine De Coster
- Department of Reproduction, Obstetrics and Herd Health, Ghent University, Salisburylaan 133, 9820 Merelbeke, Belgium; and Corresponding authors. ;
| | - Daniel Angel Velez
- Department of Reproduction, Obstetrics and Herd Health, Ghent University, Salisburylaan 133, 9820 Merelbeke, Belgium; and Corresponding authors. ;
| | - Ann Van Soom
- Department of Reproduction, Obstetrics and Herd Health, Ghent University, Salisburylaan 133, 9820 Merelbeke, Belgium
| | - Henri Woelders
- Wageningen Livestock Research, Wageningen University and Research, Droevendaalsesteeg 1, 6708 PB, Wageningen, the Netherlands
| | - Katrien Smits
- Department of Reproduction, Obstetrics and Herd Health, Ghent University, Salisburylaan 133, 9820 Merelbeke, Belgium
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Abstract
Cryobiology is a multiscale and interdisciplinary field. The scope and scale of interactions limit the gains that can be made by one theory or experiment alone. Because of this, modeling has played a critical role in both explaining cryobiological phenomena and predicting improved protocols. Modeling facilitates understanding of the biophysical and some of the biochemical mechanisms of damage during all phases of cryopreservation including CPA equilibration and cooling and warming. Moreover, as a tool for optimization of cryopreservation protocols, modeling has yielded many successes. Modern cryobiological modeling includes very detailed descriptions of the physical phenomena that occur during freezing, including ice growth kinetics and spatial gradients that define heat and mass transport models. Here we reduce the complexity and approach only a small but classic subset of these problems. Namely, here we describe the process of building and using a mathematical model of a cell in suspension where spatial homogeneity is assumed for all quantities. We define the models that describe the critical cell quantities used to describe optimal and suboptimal protocols and then give an overview of classical methods of how to determine optimal protocols using these models. We include practical considerations of modeling in cryobiology, including fitting transport models to cell volume data, performing optimization with cell volume constraints, and a look at expanding cost functions to cooling regimes.
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Affiliation(s)
- James D Benson
- Department of Biology, University of Saskatchewan, Saskatoon, SK, Canada.
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Canesin HS, Ortiz I, Rocha Filho AN, Salgado RM, Brom-de-Luna JG, Hinrichs K. Effect of warming method on embryo quality in a simplified equine embryo vitrification system. Theriogenology 2020; 151:151-158. [PMID: 32361181 DOI: 10.1016/j.theriogenology.2020.03.012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2019] [Revised: 03/03/2020] [Accepted: 03/08/2020] [Indexed: 01/19/2023]
Abstract
Equine embryo vitrification is still not a well-established technique in equine practice. Notably, little work has been done on the effect of the warming system on viability of vitrified embryos. Our goal was to evaluate the effect of warming without cryoprotectants on in vitro - produced (IVP) embryo viability in culture, quality assessment parameters, and pregnancy after transfer. Equine IVP blastocysts were vitrified using commercial embryo vitrification media and a semi-closed vitrification device. In Exp. 1, we evaluated two warming temperatures (room temperature, RT, ∼22 °C; and 38 °C) for each of three warming systems: commercial warming solution (Kit); commercial embryo holding medium (EHM) with decreasing concentrations of sucrose (EHM + SS); or EHM alone without added sucrose. Embryos (n = 9 to 14 per treatment) were cultured in vitro for 24 h, stained with DAPI, TUNEL, and fluorophore-labelled phalloidin, and evaluated for nucleus number, mitotic rate, apoptotic rate, and actin filament distribution. In Exp. 2, to survey embryo viability in vivo, vitrified IVP blastocysts were shipped to an embryo transfer facility, then warmed immediately before transfer to recipient mares, using the warming treatments associated with the nominally best (Kit-RT, Kit-38, EHM-RT) and poorest (EHM + SS-38) assessed embryo quality in Exp. 1 (n = 7 to 8 per treatment). Subsequently, IVP blastocysts produced as part of our clinical program were vitrified and shipped, then warmed in embryo holding medium at an embryo transfer facility before transfer to recipient mares; fresh IVP embryos were shipped and transferred as controls. In Exp. 1, embryos increased significantly in diameter after culture (P < 0.01), with no difference among treatments. There was no difference (P > 0.05) in the number of viable nuclei, apoptotic rate, or microfilament distribution among treatments, or between vitrified-warmed and Control embryos. The mitotic rate was higher (P = 0.021) for Kit-RT (3.6%) when compared with the other treatment groups (1.5-2.0%). In Exp. 2, there was no difference (P > 0.05) in initial pregnancy (71.4-87.5%) or heartbeat (57.1%-85.7%) rates among warming treatments. In the clinical trial, there was no difference (P > 0.05) between vitrified-warmed and Control embryos in initial pregnancy (90.9% and 66.6%, respectively) or heartbeat (81.8% and 66.6%, respectively) rates. These results indicate that a semi-closed vitrification system using commercially-available media, and incorporating warming in the field in a single step using commercial embryo holding medium without cryoprotectants, can provide high pregnancy rates with IVP equine embryos.
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Affiliation(s)
- Heloísa Siqueira Canesin
- Department of Veterinary Physiology and Pharmacology, Texas A&M University, College Station, TX, 77843-4466, United States
| | - Isabel Ortiz
- Department of Veterinary Physiology and Pharmacology, Texas A&M University, College Station, TX, 77843-4466, United States
| | | | - Renato Mayrink Salgado
- Department of Veterinary Physiology and Pharmacology, Texas A&M University, College Station, TX, 77843-4466, United States
| | - Joao Gatto Brom-de-Luna
- Department of Veterinary Physiology and Pharmacology, Texas A&M University, College Station, TX, 77843-4466, United States
| | - Katrin Hinrichs
- Department of Veterinary Physiology and Pharmacology, Texas A&M University, College Station, TX, 77843-4466, United States; Department of Large Animal Clinical Sciences, College of Veterinary Medicine & Biomedical Sciences, Texas A&M University, College Station, TX, 77843-4466, United States.
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10
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Guo Y, Yang Y, Yi X, Zhou X. Microfluidic method reduces osmotic stress injury to oocytes during cryoprotectant addition and removal processes in porcine oocytes. Cryobiology 2019; 90:63-70. [PMID: 31449779 DOI: 10.1016/j.cryobiol.2019.08.005] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2019] [Revised: 08/01/2019] [Accepted: 08/20/2019] [Indexed: 11/19/2022]
Abstract
Oocyte cryopreservation is an important technology in assisted reproduction and fertility preservation. However, the developmental potential of cryopreserved oocyte remains poor. Osmotic stress injury (OSI) during cryoprotectants (CPAs) loading and unloading steps has critical impact on successful cryopreservation. In order to minimize OSI to oocytes, a microfluidic device was designed and fabricated to achieve continuous CPA concentration change. MII porcine oocytes were loaded and unloaded CPAs with step-wise and microfluidic methods, oocyte volume changes were recorded and compared, loading and unloading duration of microfluidic methods were optimized. The survival and developmental rate of treated oocytes in step-wise and microfluidic linear methods were also evaluated. The results showed that oocyte volume changes with microfluidic method were obviously less than step-wise method, and the survival, cleavage and blastocyst rate of oocytes were 95.3%, 64.4%, and 19.4%, respectively, which were significantly higher than the traditional step-wise method (79.4%, 43.6%, and 9.7%) (p < 0.05). In conclusion, microfluidic device can effectively reduce the osmotic damage to oocytes and improve the survival rate and developmental rate of oocytes, which may provide a new path for oocyte cryopreservation.
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Affiliation(s)
- Yingying Guo
- Institute of Biomedical Technology, University of Shanghai for Science and Technology, Shanghai, China
| | - Yun Yang
- Institute of Biomedical Technology, University of Shanghai for Science and Technology, Shanghai, China
| | - Xingyue Yi
- Institute of Biomedical Technology, University of Shanghai for Science and Technology, Shanghai, China
| | - Xinli Zhou
- Institute of Biomedical Technology, University of Shanghai for Science and Technology, Shanghai, China.
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Nateghi R, Alizadeh Moghadam Masouleh A, Jafari Ahangari Y, Fathi R, Akhlaghi A. Dietary Fish Oil and Vitamin E Reduce Cryoinjuries and Apoptosis in Vitrified Laying Hens' Ovarian Tissue. Biopreserv Biobank 2019; 17:148-156. [DOI: 10.1089/bio.2018.0101] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Affiliation(s)
- Reihaneh Nateghi
- Department of Animal Science, Gorgan University of Agricultural Science and Natural Resource, Gorgan, Iran
| | | | - Yousef Jafari Ahangari
- Department of Animal Science, Gorgan University of Agricultural Science and Natural Resource, Gorgan, Iran
| | - Rouhollah Fathi
- Department of Embryology, Reproductive Biomedicine Research Center, Royan Institute for Reproductive Biomedicine, ACECR, Tehran, Iran
| | - Amir Akhlaghi
- Department of Animal Science, College of Agriculture, Shiraz University, Shiraz, Islamic Republic of Iran
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Canesin HS, Brom-de-Luna JG, Choi YH, Pereira AM, Macedo GG, Hinrichs K. Vitrification of germinal-vesicle stage equine oocytes: Effect of cryoprotectant exposure time on in-vitro embryo production. Cryobiology 2018; 81:185-191. [PMID: 29305835 DOI: 10.1016/j.cryobiol.2018.01.001] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2017] [Accepted: 01/02/2018] [Indexed: 11/26/2022]
Abstract
Previous studies have found low rates of blastocyst development (0-11%) after vitrification of germinal vesicle (GV)-stage equine oocytes. In this study, we systematically evaluated a short (non-equilibrating) system for GV-stage oocyte vitrification. In Exp. 1, we assessed oocyte volume in cumulus-oocyte complexes (COCs) exposed to components of a short protocol, using 2% each of ethylene glycol and propylene glycol in the first solution (VS1); 17.5% of each plus 0.3 M trehalose in the second solution (VS2); and fetal bovine serum as the base medium. Based on the time to oocyte minimum volume, we selected a 40-sec exposure to VS1. In Exp. 2, we evaluated exposure times to VS2 and, based on rates of subsequent maturation in vitro, we selected 65 s. In Exp. 3, we used the optimized vitrification system (40-VS1; 65-VS2) and evaluated three warming procedures. Blastocyst development after ICSI was equivalent (15%) for COCs warmed in either standard (trehalose stepwise dilution) or isotonic (base medium) solutions, but was reduced (0%) for COCs warmed in a highly hypertonic (1.5 M trehalose) solution. Exposure to the vitrification and warming solutions, without actual vitrification, was associated with reduced blastocyst development (0-5%; Exp. 4). We conclude that this optimized short protocol supports moderate blastocyst production after vitrification of GV-stage equine COCs. Oocytes can be warmed in isotonic medium, which simplifies the procedure. The systems used still showed a high level of toxicity and further work is needed on both vitrification and warming methods to increase the efficiency of this technique.
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Affiliation(s)
- Heloísa Siqueira Canesin
- College of Veterinary Medicine & Biomedical Sciences, Texas A&M University, College Station, TX, 77843-4466, United States
| | - Joao Gatto Brom-de-Luna
- College of Veterinary Medicine & Biomedical Sciences, Texas A&M University, College Station, TX, 77843-4466, United States
| | - Young-Ho Choi
- College of Veterinary Medicine & Biomedical Sciences, Texas A&M University, College Station, TX, 77843-4466, United States
| | - Amanda Macedo Pereira
- Laboratory of Animal Reproduction, Faculty of Veterinary Medicine, Federal University of Uberlândia, Uberlândia, MG, 38400-902, Brazil
| | - Gustavo Guerino Macedo
- Laboratory of Animal Reproduction, Faculty of Veterinary Medicine, Federal University of Uberlândia, Uberlândia, MG, 38400-902, Brazil
| | - Katrin Hinrichs
- College of Veterinary Medicine & Biomedical Sciences, Texas A&M University, College Station, TX, 77843-4466, United States.
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Herrick JR, Wang C, Machaty Z. The effects of permeating cryoprotectants on intracellular free-calcium concentrations and developmental potential of in vitro-matured feline oocytes. Reprod Fertil Dev 2016; 28:599-607. [DOI: 10.1071/rd14233] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2014] [Accepted: 08/26/2014] [Indexed: 11/23/2022] Open
Abstract
Embryos produced from vitrified feline oocytes have resulted in pregnancies, but the efficiency of oocyte vitrification in cats is still low. Our objectives were to evaluate the effects of exposing feline oocytes to ethylene glycol (EG), propanediol (PrOH) and dimethyl sulfoxide (DMSO) on changes in intracellular free-calcium concentrations ([Ca2+]i), the time needed for enzymatic digestion of the zona pellucida (ZP), the incidence of parthenogenetic activation and degeneration and embryonic development following in vitro fertilisation (IVF). All of the chemicals tested altered [Ca2+]i, but changes in [Ca2+]i, resistance of the ZP to enzymatic digestion and the incidence of parthenogenetic activation (<5% for all treatments) were not affected (P > 0.05) by extracellular Ca2+. Exposure to EG (>44.1%) and DMSO (19.7%) increased (P < 0.05) oocyte degeneration compared with control oocytes and oocytes exposed to PrOH (≤2.5%). Following exposure to a combination of PrOH and DMSO (10% v/v each), blastocyst development (per cleaved embryo; 52.1%) was similar (P > 0.05) to control oocytes (64.4%). When oocytes were vitrified with PrOH and DMSO, 28.3% of surviving (intact plasma membrane) oocytes cleaved following IVF, but no blastocyst developed. When a non-permeating cryoprotectant (galactose, 0.25 M) was added to the vitrification medium, 47.7% of surviving oocytes cleaved and 14.3% developed to the blastocyst stage.
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Li W, Cheng K, Zhang Y, Meng Q, Zhu S, Zhou G. No effect of exogenous melatonin on development of cryopreserved metaphase II oocytes in mouse. J Anim Sci Biotechnol 2015; 6:42. [PMID: 26380081 PMCID: PMC4568589 DOI: 10.1186/s40104-015-0041-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2015] [Accepted: 09/07/2015] [Indexed: 11/17/2022] Open
Abstract
Background This study was conducted to investigate effect of exogenous melatonin on the development of mouse mature oocytes after cryopreservation. Results First, mouse metaphase II (MII) oocytes were vitrified in the open-pulled straws (OPS). After warming, they were cultured for 1 h in M2 medium containing melatonin at different concentrations (0, 10−9, 10−7, 10−5, 10−3 mol/L). Then the oocytes were used to detect reactive oxygen species (ROS) and glutathione (GSH) levels (fluorescence microscopy), and the developmental potential after parthenogenetic activation. The experimental results showed that the ROS level and cleavage rate in 10−3 mol/L melatonin group was significantly lower than that in melatonin-free group (control). The GSH levels and blastocyst rates in all melatonin-treated groups were similar to that in control. Based on the above results, we detected the expression of gene Hsp90aa1, Hsf1, Hspa1b, Nrf2 and Bcl-x1 with qRT-PCR in oocytes treated with 10−7, or 10−3 mol/L melatonin and untreated control. After warming and culture for 1 h, the oocytes showed higher Hsp90aa1 expression in 10−7 mol/L melatonin-treated group than in the control (P < 0.05); the Hsf1, Hsp90aa1 and Bcl-x1 expression were significantly decreased in 10−3 mol/L melatonin-treated group when compared to the control. Based on the above results and previous research, we detected the development of vitrified-warmed oocytes treated with either 10−7 or 0 mol/L melatonin by in vitro fertilization. No difference was observed between them. Conclusions Our results indicate that the supplementation of melatonin (10−9 to 10−3 mol/L) in culture medium and incubation for 1 h did not improve the subsequent developmental potential of vitrified-warmed mouse MII oocytes, even if there were alteration in gene expression.
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Affiliation(s)
- Wei Li
- Institute of Animal Genetics and Breeding, College of Animal Science and Technology, Sichuan Agricultural University (Chengdu Campus), Wenjiang, 611130 P.R. China ; Institute of Animal Genetics and Breeding, College of Animal Science and Technology, China Agricultural University, Beijing, 100193 P.R. China
| | - Keren Cheng
- Department of Animal, Dairy, and Veterinary Sciences, Utah State University, Logan, Utah USA
| | - Yue Zhang
- Institute of Animal Genetics and Breeding, College of Animal Science and Technology, Sichuan Agricultural University (Chengdu Campus), Wenjiang, 611130 P.R. China
| | - Qinggang Meng
- Nanjing Biomedical Research Institute of Nanjing University, Nanjing, 210089 P.R. China
| | - Shi'en Zhu
- Department of Animal, Dairy, and Veterinary Sciences, Utah State University, Logan, Utah USA
| | - Guangbin Zhou
- Institute of Animal Genetics and Breeding, College of Animal Science and Technology, Sichuan Agricultural University (Chengdu Campus), Wenjiang, 611130 P.R. China
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Jia G, Fu X, Cheng K, Yue M, Jia B, Hou Y, Zhu S. Spermatozoa cryopreservation alters pronuclear formation and zygotic DNA demethylation in mice. Theriogenology 2015; 83:1000-6. [DOI: 10.1016/j.theriogenology.2014.11.036] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2014] [Revised: 11/18/2014] [Accepted: 11/30/2014] [Indexed: 01/27/2023]
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Abstract
Modeling plays a critical role in understanding the biophysical processes behind cryopreservation. It facilitates understanding of the biophysical and some of the biochemical mechanisms of damage during all phases of cryopreservation including CPA equilibration, cooling, and warming. Modeling also provides a tool for optimization of cryopreservation protocols and has yielded a number of successes in this regard. While modern cryobiological modeling includes very detailed descriptions of the physical phenomena that occur during freezing, including ice growth kinetics and spatial gradients that define heat and mass transport models, here we reduce the complexity and approach only a small but classic subset of these problems. Namely, here we describe the process of building and using a mathematical model of a cell in suspension where spatial homogeneity is assumed for all quantities. We define the models that describe the critical cell quantities used to describe optimal and suboptimal protocols and then give an overview of classical methods of how to determine optimal protocols using these models.
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Affiliation(s)
- James D Benson
- Department of Mathematical Sciences, Northern Illinois University, DeKalb, IL, 60115, USA,
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17
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Cryopreservation of mammalian oocytes and embryos: current problems and future perspectives. SCIENCE CHINA-LIFE SCIENCES 2014; 57:903-14. [DOI: 10.1007/s11427-014-4689-z] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2013] [Accepted: 02/03/2014] [Indexed: 01/19/2023]
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18
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Zhou Y, Fu X, Zhou G, Jia B, Fang Y, Hou Y, Zhu S. An efficient method for the sanitary vitrification of bovine oocytes in straws. J Anim Sci Biotechnol 2014; 5:19. [PMID: 24721129 PMCID: PMC4012761 DOI: 10.1186/2049-1891-5-19] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2014] [Accepted: 04/08/2014] [Indexed: 11/27/2022] Open
Abstract
Background At present, vitrification has been widely applied to humans, mice and farm animals. To improve the efficiency of vitrification in straw, bovine oocytes were used to test a new two-step vitrification method in this study. Results When in vitro matured oocytes were exposed to 20% ethylene glycol (EG20) for 5 min and 40% ethylene glycol (EG40) for 30 s, followed by treatment with 30% glycerol (Gly30), Gly40 or Gly50, a volume expansion was observed in Gly30 and Gly40 but not Gly50. This indicates that the intracellular osmotic pressure after a 30 s differs between EG40 and ranged between Gly40 (approximately 5.6 mol/L) and Gly50 (approximately 7.0 mol/L). Since oocytes are in EG40 just for only a short period of time (30 s) and at a lower temperature (4°C), we hypothesize that the main function of this step in to induce dehydration. Based on these results, we omitted the EG40 step, before oocytes were pretreated in EG20 for 5 min, exposed to pre-cooled (4°C) Gly50, for 30 s, and then dipped into liquid nitrogen. After warming, 81.1% of the oocytes survived, and the surviving oocytes developed into cleavage stage embryos (63.5%) or blastocysts (20.0%) after parthenogenetic activation. Conclusions These results demonstrate that in a two-step vitrification procedure, the permeability effect in the second step is not necessary. It is possible that the second step is only required to provide adequate osmotic pressure to condense the intracellular concentration of CPAs to a level required for successful vitrification.
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Affiliation(s)
- Yanhua Zhou
- National Engineering Laboratory for Animal Breeding, Key Laboratory of Animal genetics, Breeding and Reproduction, Ministry of Agriculture, College of Animal Science and Technology, China Agricultural University, Beijing 100193, P.R. China
| | - Xiangwei Fu
- National Engineering Laboratory for Animal Breeding, Key Laboratory of Animal genetics, Breeding and Reproduction, Ministry of Agriculture, College of Animal Science and Technology, China Agricultural University, Beijing 100193, P.R. China
| | - Guangbin Zhou
- Institute of Animal Genetics and Breeding, College of Animal Science and Technology, Sichuan Agricultural University (Chengdu Campus), Wenjiang 611130, P.R. China
| | - Baoyu Jia
- National Engineering Laboratory for Animal Breeding, Key Laboratory of Animal genetics, Breeding and Reproduction, Ministry of Agriculture, College of Animal Science and Technology, China Agricultural University, Beijing 100193, P.R. China
| | - Yi Fang
- National Engineering Laboratory for Animal Breeding, Key Laboratory of Animal genetics, Breeding and Reproduction, Ministry of Agriculture, College of Animal Science and Technology, China Agricultural University, Beijing 100193, P.R. China
| | - Yunpeng Hou
- State Key Laboratory for Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing 100193, P.R. China
| | - Shien Zhu
- National Engineering Laboratory for Animal Breeding, Key Laboratory of Animal genetics, Breeding and Reproduction, Ministry of Agriculture, College of Animal Science and Technology, China Agricultural University, Beijing 100193, P.R. China
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Wang CT, Liang L, Witz C, Williams D, Griffith J, Skorupski J, Haddad G, Gill J, Wang W. Optimized protocol for cryopreservation of human eggs improves developmental competence and implantation of resulting embryos. J Ovarian Res 2013; 6:15. [PMID: 23406718 PMCID: PMC3577428 DOI: 10.1186/1757-2215-6-15] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2013] [Accepted: 02/11/2013] [Indexed: 11/11/2022] Open
Abstract
Background Successful egg cryopreservation has many potential benefits to a variety of patients. However, a superior standard protocol describing all aspects of oocyte cryopreservation has not yet been identified. Oocyte cryopreservation is still a technical challenge for many infertility clinics. To maintain satisfactory clinical outcomes, there is a need to develop an easy to use, yet efficient laboratory protocol. The present study was designed to examine if human embryos resulting from eggs frozen with an optimized vitrification protocol have similar developmental competence as those from fresh eggs. Methods Twenty recipients received donated eggs vitrified with a protocol in which short exposure time to the vitrification solution was used and 23 recipients received donated eggs and 6 patients had their own eggs vitrified with a modified protocol in which long exposure time to the vitrification solution was used. After warming, egg survival, fertilization, cleavage, blastocyst formation, clinical pregnancy and implantation rates were compared. The developmental competence of eggs vitrified with the optimized protocol was further compared with fresh eggs donated from the same donors. Results There was no difference in the oocyte survival, fertilization, cleavage, clinical pregnancy or implantation rates between the short and long protocol groups. However, blastocyst formation rate was significantly (P < 0.001) higher in the long protocol group (50.8%) than that in short protocol group (26.5%), resulting in more blastocysts being transferred and frozen. When frozen eggs vitrified with long protocol and fresh eggs from the same donors (12) were compared in 39 recipients, no differences were observed in terms of fertilization (86.4 vs 80.1%), blastocyst formation (50.0 vs 59.2%), clinical pregnancy (63.2 vs 60.0%) and implantation (41.7 vs 44.7%) rates. Four out of 6 patients had ongoing pregnancy after transfer of embryos from their own frozen eggs with a 46.2% implantation rate. Conclusions These results indicate that blastocyst development is an appropriate measure for egg survival after cryopreservation and frozen eggs have similar developmental potential as fresh eggs if they are frozen with an optimized method.
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Affiliation(s)
- Cassie T Wang
- Houston Fertility Institute/New Houston Health, Houston, TX, USA.
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Theoretic considerations regarding slow cooling and vitrification during cryopreservation. Theriogenology 2012; 78:1641-52. [DOI: 10.1016/j.theriogenology.2012.05.003] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2011] [Revised: 04/21/2012] [Accepted: 04/23/2012] [Indexed: 11/23/2022]
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