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Cheng J, Wang X, Luo C, Mao X, Qin J, Chi Y, He B, Hao Y, Niu X, Huang B, Liu L. Effects of intracellular Ca 2+ on developmental potential and ultrastructure of cryopreserved-warmed oocyte in mouse. Cryobiology 2024; 114:104834. [PMID: 38065230 DOI: 10.1016/j.cryobiol.2023.104834] [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: 07/12/2023] [Revised: 10/15/2023] [Accepted: 12/01/2023] [Indexed: 03/22/2024]
Abstract
Maintaining appropriate intracellular calcium of oocytes is necessary to prevent ultrastructure and organelle damage caused by freezing and cryoprotectants. The present study aimed to investigate whether cryoprotectant-induced changes in the calcium concentrations of oocytes can be regulated to reduce damage to developmental potential and ultrastructure. A total of 33 mice and 1381 oocytes were used to explore the effects of intracellular calcium on the development and ultrastructures of oocytes subjected to 2-aminoethoxydiphenyl borate (2-APB) inhibition or thapsigargin (TG) stimulation. Results suggested that high levels intracellular calcium interfered with TG compromised oocyte survival (84.4 % vs. 93.4 %, p < 0.01) and blastocyst formation in fresh and cryopreservation oocytes (78.1 % vs. 86.4 %, and 60.5 % vs. 72.5 %, p < 0.05) compared with that of 2-APB pretreated oocytes in which Ca2+ was stabilized even though no differences in fertilization and cleavage was detected (p > 0.05). Examination by transmission electron microscopy indicated that the microvilli decreased and shortened, cortical granules considerably decreased in the cortex area, mitochondrial vesicles and vacuoles increased, and the proportion of vacuole mitochondria increased after oocytes were exposed to cryoprotectants. The cryopreservation-warming process deteriorated the negative effects on organelles of survival oocytes. By contrast, a low level of intracellular calcium mediated with 2-APB was supposed to contribute to the protection of organelles. These findings suggested oocyte injuries induced by cryoprotectants and low temperatures can be alleviated. More studies are necessary to confirm the relationship among Ca2+ concentration of the cytoplasm, ultrastructural injuries, and disrupted developmental potential in oocytes subjected to cryopreservation and warming.
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Affiliation(s)
- Junping Cheng
- Reproductive Medical and Genetic Center, Academy of Medical Sciences of Guangxi Autonomous Region, People's Hospital of Guangxi Autonomous Region, Nanning, 530021, China; College of Animal Science and Technology of Guangxi University, Nanning, 530005, China.
| | - Xiaoli Wang
- College of Animal Science and Technology of Guangxi University, Nanning, 530005, China
| | - Chan Luo
- College of Animal Science and Technology of Guangxi University, Nanning, 530005, China
| | - Xianbao Mao
- Reproductive Medical and Genetic Center, Academy of Medical Sciences of Guangxi Autonomous Region, People's Hospital of Guangxi Autonomous Region, Nanning, 530021, China
| | - Jie Qin
- Reproductive Medical and Genetic Center, Academy of Medical Sciences of Guangxi Autonomous Region, People's Hospital of Guangxi Autonomous Region, Nanning, 530021, China
| | - Yan Chi
- Reproductive Medical and Genetic Center, Academy of Medical Sciences of Guangxi Autonomous Region, People's Hospital of Guangxi Autonomous Region, Nanning, 530021, China
| | - Bing He
- Reproductive Medical and Genetic Center, Academy of Medical Sciences of Guangxi Autonomous Region, People's Hospital of Guangxi Autonomous Region, Nanning, 530021, China
| | - Yanrong Hao
- Reproductive Medical and Genetic Center, Academy of Medical Sciences of Guangxi Autonomous Region, People's Hospital of Guangxi Autonomous Region, Nanning, 530021, China
| | - Xiangli Niu
- Reproductive Hospital of Guangxi Zhuang Autonomous Region, Nanning, Guangxi, 530021, China
| | - Ben Huang
- Reproductive Medical and Genetic Center, Academy of Medical Sciences of Guangxi Autonomous Region, People's Hospital of Guangxi Autonomous Region, Nanning, 530021, China; College of Animal Science and Technology of Guangxi University, Nanning, 530005, China
| | - Liling Liu
- Reproductive Medical and Genetic Center, Academy of Medical Sciences of Guangxi Autonomous Region, People's Hospital of Guangxi Autonomous Region, Nanning, 530021, China.
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Potential Development of Vitrified Immature Human Oocytes: Influence of the Culture Medium and the Timing of Vitrification. Int J Mol Sci 2022; 24:ijms24010417. [PMID: 36613863 PMCID: PMC9820260 DOI: 10.3390/ijms24010417] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2022] [Revised: 12/14/2022] [Accepted: 12/24/2022] [Indexed: 12/28/2022] Open
Abstract
How does the in vitro maturation (IVM) medium and the vitrification procedure affect the survival of germinal vesicle (GV) oocytes obtained from stimulated cycles and their development to the blastocyst stage? In total, 1085 GV human oocytes were obtained after women underwent a cycle of controlled ovarian stimulation, and these oocytes were subjected to IVM before or after their vitrification. IVM was carried out in two commercial culture media not specifically designed for maturation. MII oocytes were then activated and embryo development until day 6 was evaluated. According to the results, a higher percentage of oocytes reach the MII stage if they are vitrified before they undergo IVM. Nevertheless, the medium used and the sample size determine whether these differences become significant or not. Similar survival rates and development to blastocysts were observed in all the conditions studied.
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Aquaporins and Animal Gamete Cryopreservation: Advances and Future Challenges. Animals (Basel) 2022; 12:ani12030359. [PMID: 35158682 PMCID: PMC8833750 DOI: 10.3390/ani12030359] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2021] [Revised: 01/27/2022] [Accepted: 01/31/2022] [Indexed: 02/01/2023] Open
Abstract
Simple Summary Cryopreservation is the method for the long-term preservation of gametes and embryos. In recent years, intensive research has focused on improving cryopreservation protocols for the determination of optimal freezing conditions and cryoprotective agents’ concentration for each cell type. The optimal cryopreservation protocol comprises the adequate balance between the freezing rate and the correct concentration of cryoprotective agents to achieve controlled cellular dehydration and minimal intracellular ice formation. Osmoregulation is, therefore, central in cryobiology. Water and some solutes can cross the plasma membrane, whereas facilitating transport takes a great part in intracellular/extracellular fluid homeostasis. Cells express water channels known as aquaporins that facilitate the transport of water and small uncharged solutes on their plasma membrane, including some cryoprotective agents. This review explores the expression and the function of aquaporins in gametes and embryos. In addition, the putative role of aquaporins for cryopreservation procedures is discussed. Abstract Cryopreservation is globally used as a method for long-term preservation, although freeze-thawing procedures may strongly impair the gamete function. The correct cryopreservation procedure is characterized by the balance between freezing rate and cryoprotective agents (CPAs), which minimizes cellular dehydration and intracellular ice formation. For this purpose, osmoregulation is a central process in cryopreservation. During cryopreservation, water and small solutes, including penetrating cryoprotective agents, cross the plasma membrane. Aquaporins (AQPs) constitute a family of channel proteins responsible for the transport of water, small solutes, and certain gases across biological membranes. Thirteen homologs of AQPs (AQP0-12) have been described. AQPs are widely distributed throughout the male and female reproductive systems, including the sperm and oocyte membrane. The composition of the male and female gamete membrane is of special interest for assisted reproductive techniques (ART), including cryopreservation. In this review, we detail the mechanisms involved in gamete cryopreservation, including the most used techniques and CPAs. In addition, the expression and function of AQPs in the male and female gametes are explored, highlighting the potential protective role of AQPs against damage induced during cryopreservation.
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Kageyama A, Suyama A, Kinoshita R, Ito J, Kashiwazaki N. Dynamic changes of intracellular zinc ion level during maturation, fertilization, activation, and development in mouse oocytes. Anim Sci J 2022; 93:e13759. [PMID: 35880318 DOI: 10.1111/asj.13759] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Revised: 06/12/2022] [Accepted: 06/30/2022] [Indexed: 11/29/2022]
Abstract
Although it is well known that calcium oscillations are required for fertilization in all mammalian species studied to date, recent studies also showed the ejection of zinc into the extracellular milieu in a series of coordinated events, called "zinc spark," during mammalian fertilization. These results led us to the hypothesis that a zinc ion-dependent signal is important for oocyte maturation, fertilization (activation), and further embryonic development. In this study, we evaluated the amounts and localization of intracellular zinc ions during maturation, fertilization, activation, and embryonic development in mouse oocytes. Our results show that abundant zinc ions are present in both immature and mature oocytes. After in vitro fertilization, the amounts of zinc ions were dramatically decreased at the pronuclear (PN) stage. Artificial activation by cycloheximide, SrCl2 , and TPEN also reduced the amounts of zinc ions in the PN stage. On the other hand, PN embryos derived from sperm injection still showed high level of zinc ions. However, the amounts of zinc ions rapidly increased at the blastocysts regardless of activation method. We showed here that the amounts of zinc ions dramatically changed during maturation, fertilization, activation, and development in mouse oocytes.
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Affiliation(s)
- Atsuko Kageyama
- Laboratory of Animal Reproduction, Graduate School of Veterinary Sciences, Azabu University, Sagamihara, Japan
| | - Ayumi Suyama
- Laboratory of Animal Reproduction, Graduate School of Veterinary Sciences, Azabu University, Sagamihara, Japan
| | - Ruka Kinoshita
- School of Veterinary Medicine, Azabu University, Sagamihara, Japan
| | - Junya Ito
- Laboratory of Animal Reproduction, Graduate School of Veterinary Sciences, Azabu University, Sagamihara, Japan.,School of Veterinary Medicine, Azabu University, Sagamihara, Japan.,Center for Human and Animal Symbiosis Science, Azabu University, Sagamihara, Japan
| | - Naomi Kashiwazaki
- Laboratory of Animal Reproduction, Graduate School of Veterinary Sciences, Azabu University, Sagamihara, Japan.,School of Veterinary Medicine, Azabu University, Sagamihara, Japan
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López A, Betancourt M, Ducolomb Y, Rodríguez JJ, Casas E, Bonilla E, Bahena I, Retana-Márquez S, Juárez-Rojas L, Casillas F. DNA damage in cumulus cells generated after the vitrification of in vitro matured porcine oocytes and its impact on fertilization and embryo development. Porcine Health Manag 2021; 7:56. [PMID: 34663451 PMCID: PMC8522150 DOI: 10.1186/s40813-021-00235-w] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Accepted: 10/08/2021] [Indexed: 12/31/2022] Open
Abstract
Background The evaluation of the DNA damage generated in cumulus cells after mature cumulus-oocyte complexes vitrification can be considered as an indicator of oocyte quality since these cells play important roles in oocyte developmental competence. Therefore, the aim of this study was to determine if matured cumulus-oocyte complexes exposure to cryoprotectants (CPAs) or vitrification affects oocytes and cumulus cells viability, but also if DNA damage is generated in cumulus cells, affecting fertilization and embryo development. Results The DNA damage in cumulus cells was measured using the alkaline comet assay and expressed as Comet Tail Length (CTL) and Olive Tail Moment (OTM). Results demonstrate that oocyte exposure to CPAs or vitrification reduced oocyte (75.5 ± 3.69%, Toxicity; 66.7 ± 4.57%, Vitrification) and cumulus cells viability (32.7 ± 5.85%, Toxicity; 7.7 ± 2.21%, Vitrification) compared to control (95.5 ± 4.04%, oocytes; 89 ± 4.24%, cumulus cells). Also, significantly higher DNA damage expressed as OTM was generated in the cumulus cells after exposure to CPAs and vitrification (39 ± 17.41, 33.6 ± 16.69, respectively) compared to control (7.4 ± 4.22). In addition, fertilization and embryo development rates also decreased after exposure to CPAs (35.3 ± 16.65%, 22.6 ± 3.05%, respectively) and vitrification (32.3 ± 9.29%, 20 ± 1%, respectively). It was also found that fertilization and embryo development rates in granulose-intact oocytes were significantly higher compared to denuded oocytes in the control groups. However, a decline in embryo development to the blastocyst stage was observed after CPAs exposure (1.66 ± 0.57%) or vitrification (2 ± 1%) compared to control (22.3 ± 2.51%). This could be attributed to the reduction in both cell types viability, and the generation of DNA damage in the cumulus cells. Conclusion This study demonstrates that oocyte exposure to CPAs or vitrification reduced viability in oocytes and cumulus cells, and generated DNA damage in the cumulus cells, affecting fertilization and embryo development rates. These findings will allow to understand some of the mechanisms of oocyte damage after vitrification that compromise their developmental capacity, as well as the search for new vitrification strategies to increase fertilization and embryo development rates by preserving the integrity of the cumulus cells.
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Affiliation(s)
- Alma López
- Biological and Health Sciences Program, Metropolitan Autonomous University, Mexico City, Mexico.,Department of Health Sciences, Metropolitan Autonomous University-Iztapalapa Campus, 09340, Mexico City, Mexico
| | - Miguel Betancourt
- Department of Health Sciences, Metropolitan Autonomous University-Iztapalapa Campus, 09340, Mexico City, Mexico
| | - Yvonne Ducolomb
- Department of Health Sciences, Metropolitan Autonomous University-Iztapalapa Campus, 09340, Mexico City, Mexico
| | - Juan José Rodríguez
- Genetic and Environmental Toxicology Research Unit, FES-Zaragoza-UMIEZ Campus II, National Autonomous University of Mexico, 09230, Mexico City, Mexico
| | - Eduardo Casas
- Department of Health Sciences, Metropolitan Autonomous University-Iztapalapa Campus, 09340, Mexico City, Mexico
| | - Edmundo Bonilla
- Department of Health Sciences, Metropolitan Autonomous University-Iztapalapa Campus, 09340, Mexico City, Mexico
| | - Iván Bahena
- Department of Health Sciences, Metropolitan Autonomous University-Iztapalapa Campus, 09340, Mexico City, Mexico
| | - Socorro Retana-Márquez
- Department of Biology of Reproduction, Metropolitan Autonomous University-Iztapalapa Campus, Av. San Rafael Atlixco 186, Leyes de Reforma, 09340, Mexico City, Mexico
| | - Lizbeth Juárez-Rojas
- Department of Biology of Reproduction, Metropolitan Autonomous University-Iztapalapa Campus, Av. San Rafael Atlixco 186, Leyes de Reforma, 09340, Mexico City, Mexico
| | - Fahiel Casillas
- Department of Biology of Reproduction, Metropolitan Autonomous University-Iztapalapa Campus, Av. San Rafael Atlixco 186, Leyes de Reforma, 09340, Mexico City, Mexico.
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Tharasanit T, Thuwanut P. Oocyte Cryopreservation in Domestic Animals and Humans: Principles, Techniques and Updated Outcomes. Animals (Basel) 2021; 11:ani11102949. [PMID: 34679970 PMCID: PMC8533007 DOI: 10.3390/ani11102949] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2021] [Revised: 10/05/2021] [Accepted: 10/06/2021] [Indexed: 12/25/2022] Open
Abstract
Oocyte cryopreservation plays important roles in basic research and the application of models for genetic preservation and in clinical situations. This technology provides long-term storage of gametes for genetic banking and subsequent use with other assisted reproductive technologies. Until recently, oocytes have remained the most difficult cell type to freeze, as the oocytes per se are large with limited surface area to cytoplasm ratio. They are also highly sensitive to damage during cryopreservation, and therefore the success rate of oocyte cryopreservation is generally poor when compared to noncryopreserved oocytes. Although advancement in oocyte cryopreservation has progressed rapidly for decades, the improvement of cryosurvival and clinical outcomes is still required. This review focuses on the principles, techniques, outcomes and prospects of oocyte cryopreservation in domestic animals and humans.
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Affiliation(s)
- Theerawat Tharasanit
- Department of Obstetrics, Gynecology and Reproduction, Faculty of Veterinary Science, Bangkok 10330, Thailand
- Veterinary Clinical Stem Cells and Bioengineering Research Unit, Chulalongkorn University, Bangkok 10330, Thailand
- Correspondence:
| | - Paweena Thuwanut
- Department of Obstetrics and Gynecology, Division of Reproductive Medicine, Faculty of Medicine, Chulalongkorn University, Bangkok 10330, Thailand;
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Highly successful production of viable mice derived from vitrified germinal vesicle oocytes. PLoS One 2021; 16:e0248050. [PMID: 33705447 PMCID: PMC7951897 DOI: 10.1371/journal.pone.0248050] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2020] [Accepted: 02/18/2021] [Indexed: 11/24/2022] Open
Abstract
The vitrification of immature germinal vesicle (GV) oocytes is an important way to preserve genetic resources and female fertility. However, it is well known that cryopreserved GV oocytes have very poor developmental ability and that further improvement in this technique is needed. We previously reported the successful vitrification of matured mouse oocytes with enclosed cumulus cells using the calcium-free vitrification solution supplemented with ethylene glycol (EG) by the minimal volume cooling (MVC) method. In this study, we investigated whether our method is applicable to the vitrification of mouse oocytes at the GV stage (GV oocytes). Following maturation and fertilization in vitro, vitrified GV oocytes showed high survival (94.3 ± 2.0%) and maturation (94.3 ± 2.1%) rates. Although the fertilization and blastocyst rates of vitrified oocytes (fertilization: 46.6 ± 4.9% and blastocyst: 46.6 ± 3.0%) were significantly lower than those of fresh oocytes (fertilization: 73.0 ± 7.1% and blastocyst: 71.6 ± 8.0%) (P < 0.01), there were no differences in the ability to develop to term between fresh oocytes (50.0 ± 8.4%) and vitrified oocytes (37.5 ± 4.6%) (P > 0.05). In conclusion, we here show, for the first time, the efficient production of live mice derived from vitrified GV oocytes.
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Carboxylated ε-poly-L-lysine, a cryoprotective agent, is an effective partner of ethylene glycol for the vitrification of embryos at various preimplantation stages. Cryobiology 2020; 97:245-249. [PMID: 33035552 DOI: 10.1016/j.cryobiol.2020.10.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2020] [Revised: 10/03/2020] [Accepted: 10/06/2020] [Indexed: 11/22/2022]
Abstract
It has been known that different protocols are used for embryo preservation at different stages due to different sensitivity to the physical and physiological stress caused by vitrification. In this study, we developed a common vitrification protocol using carboxlated ε-poly-l-lysine (COOH-PLL), a new cryoprotective agent for the vitrification of mouse embryos at different stages. The IVF-derived Crl:CD1(ICR) x B6D2F1/Crl pronuclear, 2-cell, 4-cell, and 8-cell, morula and blastocyst stage embryos were vitrified with 15% (v/v) ethylene glycol (EG) and 10% (w/v) COOH-PLL (E15P15) or 15% (v/v) EG and 15% (v/v) dimethyl sulfoxide (E15D15) using the minimal volume cooling method. The survival of vitrified embryos from pronuclear to blastocyst stages was equivalent between E15P15 and E15D15 groups. However, the rate of development to blastocysts was significantly lower in E15P15 than E15D15. The rates of survival and development to blastocysts were dramatically improved by a slight modification of EG and COOH-PLL concentrations (E20P10). After transferring 17 (E20P10) and 15 (E15D15) vitrified/warmed blastocysts, 8 and 7 pups were obtained (47.1% and 46.7%, respectively). Taken together, these results indicate that our vitrification protocol is appropriate for the vitrification of mouse embryos at different stages.
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9
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Cryopreservation of Mammalian Oocytes: Slow Cooling and Vitrification as Successful Methods for Cryogenic Storage. Methods Mol Biol 2020. [PMID: 32797426 DOI: 10.1007/978-1-0716-0783-1_20] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
Abstract
Two basic methods for the laboratory-focused cryopreservation of mammalian oocytes are described, based on work with murine oocytes. One method uses a relatively low concentration of the cryoprotectant propanediol plus sucrose and requires controlled rate cooling equipment to achieve a slow cooling rate. This method has also produced live births from cryopreserved human oocytes. The second method, which is described here, employs a high concentration of the cryoprotectant dimethyl sulfoxide plus a low concentration of polyethylene glycol. This is a vitrification method, which involves ultra-rapid cooling by plunging standard straws into liquid nitrogen vapor, hence avoiding the need for specialized equipment, but requires technical ability to manipulate the oocytes quickly in the highly concentrated cryoprotectant solutions. Murine oocytes that have been vitrified using this technique have resulted in live births. Vitrification using other cryoprotectant mixtures is now a popular clinically accepted method for cryobanking of human oocytes.
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10
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Chinen S, Yamanaka T, Hirabayashi M, Hochi S. Rescue of vitrified-warmed bovine mature oocytes by short-term recovery culture with resveratrol. Cryobiology 2020; 97:185-190. [PMID: 32156621 DOI: 10.1016/j.cryobiol.2020.03.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2020] [Revised: 03/06/2020] [Accepted: 03/06/2020] [Indexed: 02/01/2023]
Abstract
Resveratrol, a well-known antioxidant, has been reported to protect mouse metaphase-II (M - II) stage oocytes from vitrification injuries when used as a treatment during a series of vitrification processes. The present study was conducted to investigate whether short-term treatment of post-warm bovine mature oocytes with resveratrol can increase blastocyst formation rate following in vitro fertilization and culture. Bovine denuded M - II oocytes were vitrified-warmed using Cryotop® or nylon mesh (pore size = 37 μm) as a cryodevice. The post-warm oocytes were treated for 2 h with 1 μM resveratrol in recovery culture medium. The resveratrol treatment had no harmful influence on morphological survival and cleavage rate of the oocytes vitrified-warmed with Cryotop® or nylon mesh. In the Cryotop® vitrification series, blastocyst formation rate of resveratrol-treated post-warm oocytes (39.0%) was not significantly different from that of non-treated post-warm oocytes (31.7%). However in the nylon mesh vitrification series, there was a significant increase in the blastocyst yield (42.4% vs. 31.3%, P < 0.05) when post-warm oocytes were treated with resveratrol. Blastocyst yield from fresh control oocytes was 49%. Levels of reactive oxygen species were comparable between post-warm and fresh control M - II oocytes, and decreased in oocytes after recovery culture with resveratrol. Mitochondrial activity of post-warm oocytes was restored to the pre-vitrification level during the recovery culture regardless of resveratrol supplementation. Thus, short-term recovery culture with resveratrol can rescue bovine M - II oocytes vitrified-warmed on a nylon mesh cryodevice.
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Affiliation(s)
- Shoichiro Chinen
- Graduate School of Science and Technology, Shinshu University, Ueda, Nagano, 386-8567, Japan
| | - Takahiro Yamanaka
- Graduate School of Medicine, Science and Technology, Shinshu University, Ueda, Nagano, 386-8567, Japan
| | - Masumi Hirabayashi
- National Institute for Physiological Sciences, Okazaki, Aichi, 444-8787, Japan; School of Life Science, The Graduate University for Advanced Studies, Okazaki, Aichi, 444-8787, Japan
| | - Shinichi Hochi
- Graduate School of Science and Technology, Shinshu University, Ueda, Nagano, 386-8567, Japan; Graduate School of Medicine, Science and Technology, Shinshu University, Ueda, Nagano, 386-8567, Japan; Faculty of Textile Science and Technology, Shinshu University, Nagano, 386-8567, Japan.
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11
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Fonseca E, Mesquita P, Marques CC, Baptista MC, Pimenta J, Matos JE, Soveral G, Pereira RMLN. Modulation of P2Y2 receptors in bovine cumulus oocyte complexes: effects on intracellular calcium, zona hardening and developmental competence. Purinergic Signal 2020; 16:85-96. [PMID: 32043211 DOI: 10.1007/s11302-020-09690-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2019] [Accepted: 02/03/2020] [Indexed: 11/28/2022] Open
Abstract
The improvement of cryopreserved oocyte survival is imperative for the preservation of female fertility. In this study, we investigate whether P2Y2 receptors (P2Y2R) can be directly implicated in calcium (Ca2+) homeostasis misbalances observed during the cryopreservation process of cumulus oocyte complexes (COC). Firstly, RNA was extracted from bovine immature and mature oocytes and cumulus cells and real-time PCR performed to identify P2Y2R transcripts (experiment 1). Changes in intracellular calcium concentration [Ca2+]i of mature COC and oocytes (experiment 2) were measured upon exposure to cryoprotectants (CPA), UTP (P2Y2R stimulator, 100 μM), and/or suramin (P2Y2R inhibitor, 100 and 300 μM). The functional role of P2Y2R was investigated by analyzing the effect on oocyte viability of its modulation prior and during oocyte exposure to CPA (experiment 3). Mature COC were randomly divided into groups, and exposed to CPA and different P2Y2 modulators. Oocytes' viability, cortical granules location, and competence for development were assessed. Results showed that P2Y2R mRNAs are expressed in both oocytes and cumulus cells. Stimulation with UTP and CPA led to [Ca2+]i increase, and this effect was totally or partially blocked by suramin (P2Y2R inhibitor). Oocyte exposure to CPA and UTP reduced embryo rates compared with control and suramin100μM (P ≤ 0.04). The observed enhanced premature zona hardening in oocytes exposed to CPA (P = 0.04) and UTP (P = 0.005) stimulus was inhibited by suramin 100 μM. In conclusion, inhibition of P2Y2R during cryoprotectant exposure reduces premature intracellular Ca2+ release and significantly improves the developmental competence of exposed bovine oocytes.
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Affiliation(s)
- E Fonseca
- INIAV, Instituto Nacional de Investigação Agrária e Veterinária, Unidade de Biotecnologias e Recursos Genéticos - Santarém, Quinta da Fonte Boa, 2000-048 Vale de Santarém, Santarém, Portugal
| | - P Mesquita
- INIAV, Instituto Nacional de Investigação Agrária e Veterinária, Unidade de Biotecnologias e Recursos Genéticos - Santarém, Quinta da Fonte Boa, 2000-048 Vale de Santarém, Santarém, Portugal
| | - C C Marques
- INIAV, Instituto Nacional de Investigação Agrária e Veterinária, Unidade de Biotecnologias e Recursos Genéticos - Santarém, Quinta da Fonte Boa, 2000-048 Vale de Santarém, Santarém, Portugal
| | - M C Baptista
- INIAV, Instituto Nacional de Investigação Agrária e Veterinária, Unidade de Biotecnologias e Recursos Genéticos - Santarém, Quinta da Fonte Boa, 2000-048 Vale de Santarém, Santarém, Portugal
| | - J Pimenta
- INIAV, Instituto Nacional de Investigação Agrária e Veterinária, Unidade de Biotecnologias e Recursos Genéticos - Santarém, Quinta da Fonte Boa, 2000-048 Vale de Santarém, Santarém, Portugal.,CIISA, Faculdade de Medicina Veterinária, Universidade de Lisboa, Av. da Universidade Técnica, 1300-477, Lisbon, Portugal
| | - J E Matos
- Research Institute for Medicines (iMed.ULisboa), Faculdade de Farmácia, Universidade de Lisboa, Av. Prof. Gama Pinto, 1649-003, Lisbon, Portugal
| | - G Soveral
- Research Institute for Medicines (iMed.ULisboa), Faculdade de Farmácia, Universidade de Lisboa, Av. Prof. Gama Pinto, 1649-003, Lisbon, Portugal
| | - R M L N Pereira
- INIAV, Instituto Nacional de Investigação Agrária e Veterinária, Unidade de Biotecnologias e Recursos Genéticos - Santarém, Quinta da Fonte Boa, 2000-048 Vale de Santarém, Santarém, Portugal. .,CIISA, Faculdade de Medicina Veterinária, Universidade de Lisboa, Av. da Universidade Técnica, 1300-477, Lisbon, Portugal.
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12
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Dos Santos-Neto PC, Vilariño M, Cuadro F, Barrera N, Crispo M, Menchaca A. Cumulus cells during in vitro fertilization and oocyte vitrification in sheep: Remove, maintain or add? Cryobiology 2020; 92:161-167. [PMID: 31917962 DOI: 10.1016/j.cryobiol.2020.01.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2019] [Revised: 12/06/2019] [Accepted: 01/05/2020] [Indexed: 11/16/2022]
Abstract
The objective was to evaluate the developmental competence of immature and matured ovine oocytes after removing, maintaining or adding cumulus cells (CC) associated to vitrification by Cryotop method. Three experiments were performed involving 3,144 oocytes. In Experiment 1, CC were removed from immature, matured or fertilized oocytes subjected to in vitro embryo production. In Experiment 2, oocytes were vitrified either in MI or MII stage with or without CC, while a control group with CC remained unvitrified. In Experiment 3, oocytes partially denuded from CC were vitrified either in MI or MII stage, and a co-culture of fresh CC was added or not soon after warming to complete in vitro maturation (IVM) and in vitro fertilization (IVF), or IVF, respectively, while a control group remained unvitrified. In Experiment 1, the cleavage rate, development rate on Day 6 and blastocyst rate on Day 8 were improved when CC were maintained until the end of IVF (P < 0.05). In Experiment 2, vitrification of oocytes with enclosed CC showed a tendency to increase cleavage (P = 0.06) and improved blastocyst rate (P < 0.05). In Experiment 3, adding CC as co-culture after vitrification-warming tended to improve cleavage rate (P = 0.06) and increased hatching rate (P < 0.05). Regarding oocyte stage, vitrification of in vitro matured oocytes resulted in greater developmental competence than immature stages (P < 0.05). In conclusion, CC seems to have a relevant role for in vitro embryo development in either fresh or vitrified oocytes.
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Affiliation(s)
- P C Dos Santos-Neto
- Instituto de Reproducción Animal Uruguay, Fundación IRAUy, Camino Cruz del Sur 2250, Montevideo, Uruguay; Programa de Posgrado, Facultad de Veterinaria, Universidad de la Republica, Av. Lasplaces 1550, Montevideo, Uruguay.
| | - M Vilariño
- Instituto de Reproducción Animal Uruguay, Fundación IRAUy, Camino Cruz del Sur 2250, Montevideo, Uruguay; Programa de Posgrado, Facultad de Veterinaria, Universidad de la Republica, Av. Lasplaces 1550, Montevideo, Uruguay
| | - F Cuadro
- Instituto de Reproducción Animal Uruguay, Fundación IRAUy, Camino Cruz del Sur 2250, Montevideo, Uruguay; Programa de Posgrado, Facultad de Veterinaria, Universidad de la Republica, Av. Lasplaces 1550, Montevideo, Uruguay
| | - N Barrera
- Instituto de Reproducción Animal Uruguay, Fundación IRAUy, Camino Cruz del Sur 2250, Montevideo, Uruguay
| | - M Crispo
- Programa de Posgrado, Facultad de Veterinaria, Universidad de la Republica, Av. Lasplaces 1550, Montevideo, Uruguay; Unidad de Animales Transgénicos y de Experimentación, Institut Pasteur de Montevideo, Mataojo 2020, Montevideo, Uruguay
| | - A Menchaca
- Instituto de Reproducción Animal Uruguay, Fundación IRAUy, Camino Cruz del Sur 2250, Montevideo, Uruguay; Programa de Posgrado, Facultad de Veterinaria, Universidad de la Republica, Av. Lasplaces 1550, Montevideo, Uruguay.
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Bonte D, Thys V, De Sutter P, Boel A, Leybaert L, Heindryckx B. Vitrification negatively affects the Ca 2+-releasing and activation potential of mouse oocytes, but vitrified oocytes are potentially useful for diagnostic purposes. Reprod Biomed Online 2019; 40:13-25. [PMID: 31740224 DOI: 10.1016/j.rbmo.2019.09.012] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2019] [Revised: 09/13/2019] [Accepted: 09/23/2019] [Indexed: 10/25/2022]
Abstract
RESEARCH QUESTION To what extent does vitrification affect the Ca2+-releasing and activation potential of mouse oocytes, which are commonly used to determine the oocyte activation potential of human spermatozoa? DESIGN The effect of mouse oocyte vitrification on Ca2+ dynamics and developmental competence after oocyte activation was assessed and compared with fresh mouse oocytes. Moreover, the Ca2+ store content of the endoplasmic reticulum was determined at different time points during the vitrification-warming procedure. Finally, the Ca2+ pattern induced by cryoprotectant exposure was determined. RESULTS After human sperm injection into mouse oocytes, Ca2+ dynamics but not fertilization rates were significantly altered by vitrification warming (P < 0.05). Ca2+ dynamics in response to SrCl2 or ionomycin were also altered by oocyte vitrification. In contrast, activation and blastocyst rates after SrCl2 exposure were not affected (P > 0.05), whereas activation rates after ionomycin exposure were significantly lower in vitrified-warmed oocytes (P < 0.05); blastocyst rates were not affected (P > 0.05). Cryoprotectant exposure was associated with a strong drop in endoplasmic reticulum Ca2+ store content. Oocytes rapidly recovered during warming and recovery in Ca2+-containing media; a threshold area under the curve of Ca2+ dynamics to obtain activation rates above 90% was determined. CONCLUSIONS Vitrified-warmed mouse oocytes display reduced Ca2+-releasing potential upon oocyte activation, caused by cryoprotectant exposure. With adapted classification criteria, these oocytes could be used for diagnosing oocyte activation deficiencies in patients. Evaluating the Ca2+-signalling machinery in vitrified-warmed human oocytes is required.
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Affiliation(s)
- Davina Bonte
- Ghent-Fertility and Stem cell Team (G-FaST), Department of Human Structure and Repair, Ghent University Hospital, C. Heymanslaan 10, Ghent 9000, Belgium.
| | - Vanessa Thys
- Ghent-Fertility and Stem cell Team (G-FaST), Department of Human Structure and Repair, Ghent University Hospital, C. Heymanslaan 10, Ghent 9000, Belgium
| | - Petra De Sutter
- Ghent-Fertility and Stem cell Team (G-FaST), Department of Human Structure and Repair, Ghent University Hospital, C. Heymanslaan 10, Ghent 9000, Belgium
| | - Annekatrien Boel
- Ghent-Fertility and Stem cell Team (G-FaST), Department of Human Structure and Repair, Ghent University Hospital, C. Heymanslaan 10, Ghent 9000, Belgium
| | - Luc Leybaert
- Physiology group, Department of Basic and Applied Medical Sciences, Ghent University, C. Heymanslaagn 10, GhentGhent 9000, Belgium
| | - Björn Heindryckx
- Ghent-Fertility and Stem cell Team (G-FaST), Department of Human Structure and Repair, Ghent University Hospital, C. Heymanslaan 10, Ghent 9000, Belgium
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Nakagata N, Sztein J, Takeo T. The CARD Method for Simple Vitrification of Mouse Oocytes: Advantages and Applications. Methods Mol Biol 2019; 1874:229-242. [PMID: 30353517 DOI: 10.1007/978-1-4939-8831-0_13] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/14/2023]
Abstract
A light modification on the mouse embryos CARD simple vitrification protocol makes it possible the oocyte freezing. This rapid and handy method for cryopreservation of mouse oocytes has many advantages and multiple applications like banking the female gamete for future use, controlling the IVF timing, and facilitating the transgenic production. In this chapter we described the protocol for cryopreserving oocytes by simple vitrification method and the in-vitro fertilization carried out using fresh or frozen sperm. With this method, nearly all of the cryopreserved oocytes were recovered, resulting in more than 90% morphologically normal. From those oocytes used for in vitro fertilization, 89% of the oocytes were fertilized.
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Affiliation(s)
- Naomi Nakagata
- Division of Reproductive Engineering, Center for Animal Resources & Development (CARD), Kumamoto University, Kumamoto, Japan.
| | - Jorge Sztein
- Division of Reproductive Engineering, Center for Animal Resources & Development (CARD), Kumamoto University, Kumamoto, Japan
| | - Toru Takeo
- Division of Reproductive Engineering, Center for Animal Resources & Development (CARD), Kumamoto University, Kumamoto, Japan
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15
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Domingos Borges E, Aparecida Vireque A. Updating the Impact of Lipid Metabolism Modulation and Lipidomic Profiling on Oocyte Cryopreservation. EUROPEAN MEDICAL JOURNAL 2019. [DOI: 10.33590/emj/10310074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Oocyte cryopreservation has drastically improved in recent years and is receiving widespread clinical use with increasing demand for fertility preservation and assisted reproduction treatments. However, there are still several points to be reviewed in terms of suppressing sub-lethal damages and improving overall safety, especially when trying to preserve oocytes at the germinal vesicle stage or oocytes matured in vitro. The lipid content of oocytes is highly associated with both their competence and cryotolerance. Differences in lipid content are observed not just between different species but also at different developmental stages and when the oocytes are kept under different conditions, including cryopreservation. Many efforts have been made to understand how physiological or in vitro alterations in the lipid profile of oocytes impacts cryotolerance and vice-versa; however, the dynamics of cytosolic and membrane lipid involvement in the cryopreservation process remains poorly clarified in the human female gamete. This review presents an updated overview of the current state of cryopreservation techniques and oocyte lipidomics and highlights possible ways to improve cryotolerance, focussing on lipid content modulation.
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Affiliation(s)
- Eduardo Domingos Borges
- Department of Obstetrics and Gynecology, Faculty of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil
| | - Alessandra Aparecida Vireque
- Invitra – Assisted Reproductive Technologies Ltd., Supera Innovation and Technology Park, Ribeirão Preto, Brazil
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Abstract
SummaryCumulus cells (CCs) play an important role in the regulation of female gamete development, meiotic maturation, oocyte-sperm interaction, capacitation and acrosome reaction. However, their role in maintaining oocyte competence after vitrification is unclear as controversial data on their protecting action against oocyte cryoinjuries are available. Here we described the effects of vitrification on the ultrastructure of human CCs collected from women undergoing assisted reproductive technologies (ARTs). In total, 50 patches of CCs, sampled from high-quality human cumulus-oocyte complexes, were randomly allocated into two groups after patient informed consent: 1, fresh CCs (controls, n = 25); 2, vitrified CCs (n = 25). Samples were then prepared and observed by transmission electron microscopy. In fresh CCs, in which small cell clusters were visible, cell membranes were joined by focal gap junctions. Microvilli were rare and short. Nuclei, mitochondria, smooth endoplasmic reticulum (SER), Golgi apparatus and lipid droplets appeared well preserved; vacuoles were scarce. After vitrification, we observed two populations of CCs: light CCs, with a smooth appearance and few short microvilli; and dark CCs, with numerous and long microvilli. In both, most of the organelles appeared similar to those of fresh CCs. Lipid droplets were denser and more numerous, with respect to fresh CCs. They were mainly located in the peri-nuclear and sub-plasmalemmal regions. Numerous packed electron-negative vacuoles were visible. The vitrification procedure did not cause alterations in the fine structure of major organelles, except for an increased amount of lipid droplets and vacuoles. This specific sensitivity of human CCs to vitrification should be considered during ARTs.
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Sanaei B, Movaghar B, Rezazadeh Valojerdi M, Ebrahimi B, Bazrgar M, Hajian M, Nasr-Esfahani MH. Developmental competence of in vitro matured ovine oocytes vitrified in solutions with different concentrations of trehalose. Reprod Domest Anim 2018; 53:1159-1167. [PMID: 29938846 DOI: 10.1111/rda.13221] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2017] [Revised: 04/27/2018] [Accepted: 05/01/2018] [Indexed: 01/30/2023]
Abstract
This study aimed to determine the optimum concentration of trehalose in solutions used for vitrification of in vitro matured (IVM) ovine oocytes. IVM oocytes were randomly divided into four experimental (vitrified) and one control (fresh) groups. Experimental groups were treated with different concentrations (0.0, 0.25, 0.5 and 1.0 M) of trehalose. After warming, some viable oocytes were exposed to 0.25% pronase to test zona pellucida hardening, whereas the others were fertilized and cultured in vitro for 8 days to evaluate their developmental competence. Blastocysts quality was assessed by differential staining and TUNEL test. Survival and developmental rates of oocytes vitrified in the presence of 0.5 M trehalose were significantly higher than those of the other vitrified groups. Furthermore, there was a significant difference between fresh and vitrified groups in total blastocyst rate. Analysis of blastocysts quality also revealed a significant difference between the group treated with 0.5 M trehalose and other groups in terms of apoptotic index. Furthermore,zona pellucida digestion time period was longer in trehalose-free (0.0 M) group compared to other groups. In conclusion, we found that IVM ovine oocytes vitrified in solutions containing 0.5 M trehalose are fertilization-competent and are able to produce good-quality blastocysts with an apoptotic index comparable to that of the fresh oocytes. Therefore, 0.5 M may be considered the optimum concentration of trehalose to be used in solutions prepared for vitrification of oocytes.
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Affiliation(s)
- Batool Sanaei
- Department of Embryology, Reproductive Biomedicine Research Center, Royan Institute for Reproductive Biomedicine, ACECR, Tehran, Iran
| | - Bahar Movaghar
- Department of Embryology, Reproductive Biomedicine Research Center, Royan Institute for Reproductive Biomedicine, ACECR, Tehran, Iran
| | | | - Bita Ebrahimi
- Department of Embryology, Reproductive Biomedicine Research Center, Royan Institute for Reproductive Biomedicine, ACECR, Tehran, Iran
| | - Masood Bazrgar
- Department of Genetics, Reproductive Biomedicine Research Center, Royan Institute for Reproductive Biomedicine, ACECR, Tehran, Iran
| | - Mehdi Hajian
- Department of Reproductive Biotechnology, Reproductive Biomedicine Research Center, Royan Institute for Biotechnology, ACECR, Tehran, Iran
| | - Mohammad H Nasr-Esfahani
- Department of Reproductive Biotechnology, Reproductive Biomedicine Research Center, Royan Institute for Biotechnology, ACECR, Tehran, Iran
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Marques C, Santos-Silva C, Rodrigues C, Matos J, Moura T, Baptista M, Horta A, Bessa R, Alves S, Soveral G, Pereira R. Bovine oocyte membrane permeability and cryosurvival: Effects of different cryoprotectants and calcium in the vitrification media. Cryobiology 2018. [DOI: 10.1016/j.cryobiol.2018.03.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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19
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Ishii T, Tomita K, Sakakibara H, Ohkura S. Embryogenesis of vitrified mature bovine oocytes is improved in the presence of multi-layered cumulus cells. J Reprod Dev 2017; 64:95-99. [PMID: 29057767 PMCID: PMC5830364 DOI: 10.1262/jrd.2017-095] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
This study was aimed at evaluating the effects of multi-layered cumulus cells (MCCs) during vitrification and in vitro fertilization (IVF) of mature bovine oocytes and embryogenesis after IVF. The rates of cleavage and blastocyst formation were higher in vitrified and fertilized oocytes with MCCs than in denuded oocytes (P < 0.05), but were comparable to the rates in fresh oocytes with MCCs or without (denuded). When the MCC-enclosed oocytes were denuded before IVF, blastocyst formation rate reduced compared with that in vitrified oocytes with MCCs (P < 0.05). This suggested that the MCCs surrounding the mature bovine oocytes play important roles during cryopreservation: protecting them against freezing and promoting their survival and development post IVF, thereby increasing the success rates of IVF and embryonic development. Herein, we showed for the first time that calves could be produced using only 14-19 vitrified mature oocytes with MCCs from the ovaries of individual cows post slaughter.
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Affiliation(s)
- Toshimichi Ishii
- Department of Livestock Improvement and Reproduction, Mie Prefectural Livestock Research Center, Mie 515-2324, Japan
| | - Kensuke Tomita
- Department of Livestock Improvement and Reproduction, Mie Prefectural Livestock Research Center, Mie 515-2324, Japan
| | - Hideo Sakakibara
- Department of Livestock Improvement and Reproduction, Mie Prefectural Livestock Research Center, Mie 515-2324, Japan
| | - Satoshi Ohkura
- Laboratory of Animal Production Science, Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya 464-8601, Japan
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Faizah Z, Darsini N, Hinting A. FERTILIZATION OF BOVINE OOCYTES VITRIFIED PRE- AND POST IN VITRO MATURATION. FOLIA MEDICA INDONESIANA 2017. [DOI: 10.20473/fmi.v52i2.5222] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The success rate of fertilization post save frozen oocytes is still very low, because the oocyte has distinctive features, namely the volume ratio and a lower surface to the limited penetration of water and cryoprotectants penetrate cells. Beside mature oocytes have a thread spindles are particularly vulnerable to the drop in temperature. Keep frozen oocytes is needed, especially in women who needed rescue fertility so their oosit can be fertilized. Maturation is done in TC 100 mL medium covered with mineral oil in a petri dish with a diameter of 36 mm. Oocyte vitrification begins with washing in PBS supplemented medium serum 20% for 1-2 minutes, followed by serum in the medium PBS + 20% + 10% ethylene glycol for 10-14 minutes. Then oocyte vitrification medium is transported in PBS + serum 20% + sucrose 0.5M ethylene glycol + 15% + 15% PROH for 25-30 seconds. Thawing oocytes is done by successive immersed in the media: 1). PBS + 20% serum + 0.5M sucrose, 2). PBS + 20% serum + 0.25M sucrose, and 3). PBS + 20% serum + 0.1 M sucrose. Insemination is done in rosset, and the number of fertilization was observed after 48 hours. Fertilization in the control group amounted to 42.97%, while the K1 and K2 there are no fertilization at all. The analysis showed that fertilization in the control and treatment groups significantly different at p <0.05 in both treatment groups K1 or K2 there are no fertilization at all. The conclusions of this study is there is no difference between the amount of fertilization of bovine oocytes were vitrified pre and post-maturation in vitro.
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Kamoshita M, Kato T, Fujiwara K, Namiki T, Matsumura K, Hyon SH, Ito J, Kashiwazaki N. Successful vitrification of pronuclear-stage pig embryos with a novel cryoprotective agent, carboxylated ε-poly-L-lysine. PLoS One 2017; 12:e0176711. [PMID: 28448636 PMCID: PMC5407792 DOI: 10.1371/journal.pone.0176711] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2016] [Accepted: 04/15/2017] [Indexed: 11/18/2022] Open
Abstract
Vitrification is a powerful tool for the efficient production of offspring derived from cryopreserved oocytes or embryos in mammalian species including domestic animals. Genome editing technologies such as transcription activator-like effector nucleases (TALENs) and clustered regularly interspaced short palindromic repeats (CRISPR)/ CRISPR-associated (Cas)9 are now available even for domestic species, suggesting that the vitrification of embryos at the pronuclear stage (PN) will be more important because they could provide genomic host cells to be targeted by TALENs or CRISPR/Cas9. Although we reported the successful production of piglets derived from vitrified PN embryos by a solid-surface vitrification method with glutathione supplementation, further improvements are required. The cryoprotective agent (CPA) carboxylated ε-poly-L-lysine (COOH-PLL) was introduced in 2009. COOH-PLL reduces the physical and physiological damage caused by cryopreservation in mammalian stem cells and the vitrification of mouse oocytes and embryos. Those results suggested that vitrification of COOH-PLL may help improve the developmental ability of pig embryos vitrified at the PN stage. However, it remains unclear whether COOH-PLL is available as a CPA for the vitrification of embryos in domestic species. In this study, we evaluated COOH-PLL as a CPA with ethylene glycol (EG) and Cryotop as a device for the vitrification of PN pig embryos. Exposure to vitrification solution supplemented with COOH-PLL up to 30% did not decrease developmental ability to the 2-cell stage and the blastocyst stage. After warming, most of the vitrified embryos survived regardless of the concentration of COOH-PLL (76.0 ± 11.8% to 91.8 ± 4.6%). However, the vitrified embryos without COOH-PLL showed a lower development rate up to the blastocyst stage (1.3 ± 1.0%) compared to the fresh embryos (28.4 ± 5.0%) (p<0.05). In contrast, supplementation of 20% (w/v) COOH-PLL in the vitrification solution dramatically improved the developmental ability to blastocysts of the vitrified embryos (19.4 ± 4.6%) compared to those without COOH-PLL (p<0.05). After the transfer of embryos vitrified with 30% (v/v) EG and 20% (w/v) COOH-PLL, we successfully obtained 15 piglets from 8 recipients. Taken together, our present findings demonstrate for the first time that COOH-PLL is an effective CPA for embryo vitrification in the pig. COOH-PLL is a promising CPA for further improvements in the vitrification of oocytes and embryos in mammalian species.
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Affiliation(s)
- Maki Kamoshita
- Laboratory of Animal Reproduction, Graduate School of Veterinary Science, Azabu University, Sagamihara, Japan
| | - Tsubasa Kato
- Laboratory of Animal Reproduction, Graduate School of Veterinary Science, Azabu University, Sagamihara, Japan
| | - Katsuyoshi Fujiwara
- Laboratory of Animal Reproduction, Graduate School of Veterinary Science, Azabu University, Sagamihara, Japan
| | - Takafumi Namiki
- Laboratory of Animal Reproduction, Graduate School of Veterinary Science, Azabu University, Sagamihara, Japan
| | | | - Suong-Hyu Hyon
- Center for Fiber and Textile Science, Kyoto Institute of Technology, Matsugasaki, Kyoto, Japan
| | - Junya Ito
- Laboratory of Animal Reproduction, Graduate School of Veterinary Science, Azabu University, Sagamihara, Japan
- School of Veterinary Medicine, Azabu University, Sagamihara, Japan
| | - Naomi Kashiwazaki
- Laboratory of Animal Reproduction, Graduate School of Veterinary Science, Azabu University, Sagamihara, Japan
- School of Veterinary Medicine, Azabu University, Sagamihara, Japan
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Fujiwara K, Kamoshita M, Kato T, Ito J, Kashiwazaki N. Generation of rats from vitrified oocytes with surrounding cumulus cells viain vitrofertilization with cryopreserved sperm. Anim Sci J 2016; 88:180-184. [DOI: 10.1111/asj.12666] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2015] [Revised: 04/21/2016] [Accepted: 05/10/2016] [Indexed: 11/30/2022]
Affiliation(s)
- Katsuyoshi Fujiwara
- Laboratory of Animal Reproduction, Graduate School of Veterinary Sciences; Azabu University; Sagamihara Kanagawa Japan
| | - Maki Kamoshita
- Laboratory of Animal Reproduction, Graduate School of Veterinary Sciences; Azabu University; Sagamihara Kanagawa Japan
| | - Tsubasa Kato
- Laboratory of Animal Reproduction, Graduate School of Veterinary Sciences; Azabu University; Sagamihara Kanagawa Japan
| | - Junya Ito
- Laboratory of Animal Reproduction, Graduate School of Veterinary Sciences; Azabu University; Sagamihara Kanagawa Japan
- School of Veterinary Medicine; Azabu University; Sagamihara Kanagawa Japan
| | - Naomi Kashiwazaki
- Laboratory of Animal Reproduction, Graduate School of Veterinary Sciences; Azabu University; Sagamihara Kanagawa Japan
- School of Veterinary Medicine; Azabu University; Sagamihara Kanagawa Japan
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Molina I, Gómez J, Balasch S, Pellicer N, Novella-Maestre E. Osmotic-shock produced by vitrification solutions improves immature human oocytes in vitro maturation. Reprod Biol Endocrinol 2016; 14:27. [PMID: 27170005 PMCID: PMC4866294 DOI: 10.1186/s12958-016-0161-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/05/2016] [Accepted: 04/27/2016] [Indexed: 11/30/2022] Open
Abstract
BACKGROUND During cytoplasmic oocyte maturation, Ca(2+) currents are vital for regulating a broad range of physiological processes. Recent studies have demonstrated that DMSO and EG cause large transient increases in intracellular Ca(2+) in mouse oocytes. The CP used in vitrifying protocols also increases the intracellular calcium transient. The aim of this study is to evaluate the effects of vitrifying time (before and after IVM) and exposure to the vitrification solutions and ionomycin on oocyte quality and embryonic development. METHODS 221 GV-oocytes unsuitable for IVF-ICSI cycles were randomly distributed into one of the following three groups. G1 (control group): 41 GV-oocytes IVM until MII; G2: 43 oocytes vitrified at GV stage and IVM until MII stage; and G3: 53 GV-oocytes IVM until MII and then vitrified. In order to clarify the effect of vitrification solutions (VS) on human oocyte IVM through the intracellular Ca(2+) oscillation, the following two groups were also included. G4: 43 GV-oocytes exposed to VS and IVM until MII; and G5: 41 GV-oocytes exposed to ionomycin and IVM until MII. All GV-oocytes that reached MII-stage were parthenogenetically activated to assess oocyte viability. IVM was performed in IVF-medium (24-48 h). Chemical treatment (ionomycin) and osmotic treatment (vitrification solutions) were performed without liquid-N2 immersion. The following rates were evaluated: survival (SR), in-vitro maturation (IVMR), activation (AR), development to 2-cell (DRC), development to morula (DRCM) and development to blastocyst (DRB). Ratios between the different treatment groups were compared using contingency tables analysis (chi-square test). RESULTS A high survival rate was obtained in G2 (95.5 %) and G4 (96.6 %). In-vitro maturation rate was significantly higher for G4 (86 %) and G2 (83.7 %) compared to G1 (63.4 %), G3 (56.6 %) and G5 (48.8 %). DRCM was significantly higher for G1 and G2 compared to G3 (G1: 15.8 %, G2: 20.7 % and G3: 0 %). DRB was only obtained for the oocytes vitrified before IVM (G2: 3.4 %). AR was also significantly higher for G2 and G4 compared to G5 (G2: 80.5 %, G4: 86.5 % and G5: 55 %). DRCM and DRB were only obtained in G2 and G4. DRCM was significantly higher for oocytes vitrified at GV stage (G2) and for oocytes exposed to the VS in G4 compared to the oocytes exposed to the ionomycin in G5 (G2: 20.7 %; G4: 37.5 % and G5: 0 %). CONCLUSIONS Vitrifying GV-oocytes improves their IVM. Further investigation could look to increase the oocyte pool and improve fertility preservation options.
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Affiliation(s)
- Inmaculada Molina
- Unidad de Reproducción Humana, Área de Salud de la Mujer, Hospital Universitario y Politécnico La Fe, Valencia, Spain
| | - Judith Gómez
- Unidad de Reproducción Humana, Área de Salud de la Mujer, Hospital Universitario y Politécnico La Fe, Valencia, Spain
| | - Sebastián Balasch
- Departamento de Estadística e Investigación Operativa Aplicadas y Calidad, Universidad Politécnica de Valencia, Valencia, Spain
| | - Nuria Pellicer
- Fundación Instituto Valenciano de Infertilidad, Instituto Universitario IVI, Valencia, Spain
| | - Edurne Novella-Maestre
- Unidad de Genética, Torre A planta 4º, Hospital Universitario y Politécnico La Fe, Avenida de Fernando Abril Martorell, nº 106, 46026, Valencia, Spain.
- Grupo de investigación de Medicina Reproductiva, Instituto de Investigación Sanitario La Fe, Valencia, Spain.
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Brito DC, Domingues SF, Silva JK, Wu X, Santos RR, Pieczarka JC. Detrimental Effect of Phenol Red on the Vitrification of Cat (Felis catus) Ovarian Tissue. Biopreserv Biobank 2016; 14:17-22. [DOI: 10.1089/bio.2015.0025] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Affiliation(s)
- Danielle C. Brito
- Laboratory of Cytogenetics, Biological Sciences Institute, Federal University of Pará, Belem, Brazil
- Laboratory of Wild Animal Biology and Medicine, Federal University of Pará, Belem, Brazil
| | - Sheyla F.S. Domingues
- Laboratory of Wild Animal Biology and Medicine, Federal University of Pará, Belem, Brazil
| | - Joyce K. Silva
- Laboratory Engineering of Natural Products, Federal University of Pará, Belem, Brazil
| | - Xueqing Wu
- Faculty of Veterinary Medicine, Utrecht University, Utrecht, the Netherlands
| | - Regiane R. Santos
- Laboratory of Wild Animal Biology and Medicine, Federal University of Pará, Belem, Brazil
- Faculty of Veterinary Medicine, Utrecht University, Utrecht, the Netherlands
| | - Julio C. Pieczarka
- Laboratory of Cytogenetics, Biological Sciences Institute, Federal University of Pará, Belem, Brazil
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25
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Tong XH, Wu LM, Jin RT, Luan HB, Liu YS. Human oocyte vitrification with corona radiata, in autologous follicular fluid supplemented with ethylene glycol, preserves conventional IVF potential: birth of four healthy babies. Reprod Fertil Dev 2015; 26:1001-6. [PMID: 23910960 DOI: 10.1071/rd13161] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2013] [Accepted: 06/28/2013] [Indexed: 11/23/2022] Open
Abstract
The aim of this study was to examine the effects of vitrification with autologous follicular fluid (AFF) supplemented with ethylene glycol (EG) and sucrose on human oocytes with corona radiata. A total of 182 human oocytes with corona radiata from fifteen infertile patients were vitrified using either equilibration solutions (ES) and vitrification solution (VS) consisting of AFF, EG and sucrose (AFF group, n=67) or commercial ES and VS (control group, n=115). All oocytes were thawed in the next cycle, with surviving oocytes being inseminated by conventional IVF. The clinical outcome of vitrified-warmed oocytes by both vitrification methods was analysed retrospectively. In the AFF group, six patients received embryo transfer, with three couples taking four healthy babies home. In the control group, nine patients received embryo transfer, with four couples taking five healthy babies home. There was no significant difference in the survival rate (91.0 vs 92.2%), two pronuclei (2PN) fertilisation rate (73.8 vs 73.6%), cleavage rate (100 vs 100%), top-quality embryo rate (62.2 vs 59.2%), clinical pregnancy rate (50.0 vs 44.4%), implantation rate (33.3 vs 25%) or take-home baby rate (50.0 vs 44.4%) between the AFF group and the control group, respectively. These results show that AFF supplemented with EG and sucrose is an efficient, cost-effective cryoprotectant for human oocyte cryopreservation. A corona radiata on vitrified-warmed oocytes retains the oocytes' fertilisation capability in conventional IVF.
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Affiliation(s)
- Xian-Hong Tong
- Institute of Immunology, Medical College of Shandong University, Jinan 250012, China
| | - Li-Min Wu
- Reproductive Medical Centre of Anhui Provincial Hospital Affiliated to Anhui Medical University, Hefei 230001, China
| | - Ren-Tao Jin
- Reproductive Medical Centre of Anhui Provincial Hospital Affiliated to Anhui Medical University, Hefei 230001, China
| | - Hong-Bing Luan
- Reproductive Medical Centre of Anhui Provincial Hospital Affiliated to Anhui Medical University, Hefei 230001, China
| | - Yu-Sheng Liu
- Reproductive Medical Centre of Anhui Provincial Hospital Affiliated to Anhui Medical University, Hefei 230001, China
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26
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Yashiro I, Tagiri M, Ogawa H, Tashima K, Takashima S, Hara H, Hirabayashi M, Hochi S. High revivability of vitrified-warmed bovine mature oocytes after recovery culture with α-tocopherol. Reproduction 2015; 149:347-55. [PMID: 25628440 DOI: 10.1530/rep-14-0594] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The objective of this study was to investigate whether developmental competence of vitrified-warmed bovine oocytes can be improved by antioxidant treatment during recovery culture. In experiment 1, one of the two antioxidants (either l-ascorbic acid or α-tocopherol) was added as a supplement to the recovery culture medium to which postwarming oocytes were exposed for 2 h before IVF. The exposure to α-tocopherol had a positive effect on rescuing the oocytes as assessed by the blastocyst yield 8 days after the IVF (35.1-36.3% vs 19.2-25.8% in untreated postwarming oocytes). Quality of expanding blastocysts harvested on Day 8 was comparable between α-tocopherol-treated vitrification group and fresh control group in terms of total cell number and chromosomal ploidy. In experiment 2, level of reactive oxygen species, mitochondrial activity, and distribution of cortical granules in α-tocopherol-treated postwarming oocytes were assessed. No obvious differences from the control data were found in these parameters. However, the treatment with α-tocopherol increased the percentage of zygotes exhibiting normal single aster formation (90.3% vs 48.0% in untreated postwarming oocytes; 10 h post-IVF). It was concluded that α-tocopherol treatment of vitrified-warmed bovine mature oocytes during recovery culture can improve their revivability, as shown by the high blastocyst yield and the higher mean total cell number in the blastocysts.
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Affiliation(s)
- Ikuko Yashiro
- Graduate School of Science and Technology Faculty of Textile Science and Technology Shinshu University, Nagano 386-8567, Japan National Institute for Physiological Sciences Aichi 444-8787, Japan
| | - Miho Tagiri
- Graduate School of Science and Technology Faculty of Textile Science and Technology Shinshu University, Nagano 386-8567, Japan National Institute for Physiological Sciences Aichi 444-8787, Japan
| | - Hayato Ogawa
- Graduate School of Science and Technology Faculty of Textile Science and Technology Shinshu University, Nagano 386-8567, Japan National Institute for Physiological Sciences Aichi 444-8787, Japan
| | - Kazuya Tashima
- Graduate School of Science and Technology Faculty of Textile Science and Technology Shinshu University, Nagano 386-8567, Japan National Institute for Physiological Sciences Aichi 444-8787, Japan
| | - Seiji Takashima
- Graduate School of Science and Technology Faculty of Textile Science and Technology Shinshu University, Nagano 386-8567, Japan National Institute for Physiological Sciences Aichi 444-8787, Japan Graduate School of Science and Technology Faculty of Textile Science and Technology Shinshu University, Nagano 386-8567, Japan National Institute for Physiological Sciences Aichi 444-8787, Japan
| | - Hiromasa Hara
- Graduate School of Science and Technology Faculty of Textile Science and Technology Shinshu University, Nagano 386-8567, Japan National Institute for Physiological Sciences Aichi 444-8787, Japan
| | - Masumi Hirabayashi
- Graduate School of Science and Technology Faculty of Textile Science and Technology Shinshu University, Nagano 386-8567, Japan National Institute for Physiological Sciences Aichi 444-8787, Japan
| | - Shinichi Hochi
- Graduate School of Science and Technology Faculty of Textile Science and Technology Shinshu University, Nagano 386-8567, Japan National Institute for Physiological Sciences Aichi 444-8787, Japan Graduate School of Science and Technology Faculty of Textile Science and Technology Shinshu University, Nagano 386-8567, Japan National Institute for Physiological Sciences Aichi 444-8787, Japan
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27
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Shibao Y, Fujiwara K, Kawasaki Y, Matsumura K, Hyon SH, Ito J, Kashiwazaki N. The effect of a novel cryoprotective agent, carboxylated ε-poly-l-lysine, on the developmental ability of re-vitrified mouse embryos at the pronuclear stage. Cryobiology 2014; 68:200-4. [DOI: 10.1016/j.cryobiol.2014.01.008] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2013] [Accepted: 01/14/2014] [Indexed: 12/28/2022]
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Efficient production of live offspring from mouse oocytes vitrified with a novel cryoprotective agent, carboxylated ε-poly-L-lysine. PLoS One 2013; 8:e83613. [PMID: 24376724 PMCID: PMC3871522 DOI: 10.1371/journal.pone.0083613] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2013] [Accepted: 11/05/2013] [Indexed: 12/02/2022] Open
Abstract
In cryopreservation of mammalian germ cells, unfertilized oocytes are one of the most available stages because these cryopreserved oocytes can be used for assisted reproductive technologies, including in vitro fertilization (IVF) and intracytoplasmic sperm injection. However, it has been generally reported that the fertility and developmental ability of the oocytes are reduced by cryopreservation. Therefore further improvement will be required. Very recently, a new cryoprotective agent (CPA), called as carboxylated ε-poly-L-lysine (COOH-PLL), has been developed to reduce physical and physiological damage by cryopreservation in mammalian stem cells. However, it is unclear the effect of COOH-PLL on fertility and developmental ability of vitrified oocytes. In this study, we used COOH-PLL as a CPA with ethylene glycol (EG) for vitrification of mouse oocytes. Cumulus-oocyte complexes (COCs) were collected from ICR mice and then vitrified with Cryotop using different concentration of COOH-PLL and EG. A combined treatment with COOH-PLL and EG showed high survival rate (more than 90%) of vitrified-warmed COCs after in vitro fertilization. In addition, the fertility and developmental ability of COCs vitrified with E20P10 [EG 20% (v/v) and COOH-PLL 10% (w/v)] or E15P15 group (EG 15% and COOH-PLL 15%) were significantly higher than those with E10P20 (EG10% and COOH-PLL 20%) or P30 group (PLL30%). The vitrified COCs in E20P10 group developed to term at a high success rate (46.2%) and it was significantly higher than that in control (E30) group (34.8%). Our present study demonstrated for the first time that COOH-PLL is effective for vitrification of mouse oocytes.
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Hwang IS, Hara H, Chung HJ, Hirabayashi M, Hochi S. Rescue of Vitrified-Warmed Bovine Oocytes with Rho-Associated Coiled-Coil Kinase Inhibitor1. Biol Reprod 2013; 89:26. [DOI: 10.1095/biolreprod.113.109769] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
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30
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Nakagata N, Takeo T, Fukumoto K, Kondo T, Haruguchi Y, Takeshita Y, Nakamuta Y, Matsunaga H, Tsuchiyama S, Ishizuka Y, Araki K. Applications of cryopreserved unfertilized mouse oocytes for in vitro fertilization. Cryobiology 2013; 67:188-92. [PMID: 23846105 DOI: 10.1016/j.cryobiol.2013.06.011] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2013] [Revised: 05/27/2013] [Accepted: 06/26/2013] [Indexed: 10/26/2022]
Abstract
Since the first successful reports into oocyte freezing, many papers concerning the cryopreservation of mouse oocytes have been published. However, a simple and practical cryopreservation method for unfertilized C57BL/6 mouse oocytes, and an IVF system using these cryopreserved oocytes have yet to be established, in spite of the fact that C57BL/6 is the prevalent inbred strain and is used for large-scale knockout programs. In this study, unfertilized C57BL/6 mouse oocytes were cryopreserved via a simple vitrification method. After warming, IVF was performed using cryopreserved unfertilized oocytes and fresh sperm, cryopreserved unfertilized oocytes and cold-stored sperm, cryopreserved unfertilized oocytes and frozen sperm (C57BL/6 strain sperm), and cryopreserved unfertilized oocytes and frozen sperm derived from GEM strains (C57BL/6 background GEM strains). Nearly all of the cryopreserved oocytes were recovered, of which over 90% were morphologically normal. Those oocytes were then used for in vitro fertilization, resulting in 72-97% of oocytes developing into 2-cell embryos. A portion of the 2-cell embryos were transferred to recipients, resulting in live young being produced from 32-49% of the embryos. In summary, we established the simple and practical method of mouse oocyte vitrification with high survivability and developmental ability and the IVF using the vitrified-warmed oocytes with fresh, cold-stored or cryopreserved sperm with high fertility.
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Affiliation(s)
- Naomi Nakagata
- Division of Reproductive Engineering, Center for Animal Resources and Development (CARD), Kumamoto University, 2-2-1 Honjo, Kumamoto 860-0811, Japan.
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Hirose M, Kamoshita M, Fujiwara K, Kato T, Nakamura A, Wojcikiewicz RJH, Parys JB, Ito J, Kashiwazaki N. Vitrification procedure decreases inositol 1,4,5-trisphophate receptor expression, resulting in low fertility of pig oocytes. Anim Sci J 2013; 84:693-701. [PMID: 23607492 DOI: 10.1111/asj.12061] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2012] [Accepted: 01/30/2013] [Indexed: 01/25/2023]
Abstract
Although cryopreservation of mammalian oocytes is an important technology, it is well known that unfertilized oocytes, especially in pigs, are highly sensitive to low temperature and that cryopreserved oocytes show low fertility and developmental ability. The aim of the present study was to clarify why porcine in vitro matured (IVM) oocytes at the metaphase II (MII) stage showed low fertility and developmental ability after vitrification. In vitro matured cumulus oocyte complexes (COCs) were vitrified with Cryotop and then evaluated for fertility through in vitro fertilization (IVF). Although sperm-penetrated oocytes were observed to some extent (30-40%), the rate of pronuclear formation was low (9%) and none of them progressed to the two-cell stage. The results suggest that activation ability of cryopreserved oocytes was decreased by vitrification. We examined the localization and expression level of the type 1 inositol 1,4,5 trisphosphate receptor (IP3 R1), the channel responsible for Ca(2+) release during IVF in porcine oocytes. Localization of IP3 R1 close to the plasma membrane and total expression level of IP3 R1 protein were both decreased by vitrification. In conclusion, our present study indicates that vitrified-warmed porcine COCs showed a high survival rate but low fertility after IVF. This low fertility seems to be due to the decrease in IP3 R1 by the vitrification procedure.
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Affiliation(s)
- Masahiko Hirose
- Laboratory of Animal Reproduction, Graduate School of Veterinary Sciences, Sagamihara, Japan
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Kohaya N, Fujiwara K, Ito J, Kashiwazaki N. Generation of live offspring from vitrified mouse oocytes of C57BL/6J strain. PLoS One 2013; 8:e58063. [PMID: 23516430 PMCID: PMC3596345 DOI: 10.1371/journal.pone.0058063] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2012] [Accepted: 01/30/2013] [Indexed: 11/18/2022] Open
Abstract
In mammals, unfertilized oocytes are one of the most available stages for cryopreservation because the cryopreserved oocytes can be used for assisted reproductive technologies, including in vitro fertilization (IVF) and intracytoplasmic sperm injection. However, it has generally been reported that the fertility and developmental ability of the oocytes are reduced by cryopreservation. C57BL/6J mice, an inbred strain, are used extensively for the production of transgenic and knockout mice. If the oocytes from C57BL/6J mice can be successfully cryopreserved, the cryopreservation protocol used will contribute to the high-speed production of not only gene-modified mice but also hybrid mice. Very recently, we succeeded in the vitrification of mouse oocytes derived from ICR (outbred) mice. However, our protocol can be applied to the vitrification of oocytes from an inbred strain. The aim of the present study was to establish the vitrification of oocytes from C57BL/6J mice. First, the effect of cumulus cells on the ability of C57BL/6J mouse oocytes to fertilize and develop in vitro was examined. The fertility and developmental ability of oocyte-removed cumulus cells (i.e., denuded oocytes, or DOs) after IVF were reduced compared to cumulus oocyte complexes (COCs) in both fresh and cryopreserved groups. Vitrified COCs showed significantly (P<0.05) higher fertility and ability to develop into the 2-cell and blastocyst stages compared to the vitrified DOs with cumulus cells and vitrified DOs alone. The vitrified COCs developed to term at a high success rate, equivalent to the rate obtained with IVF using fresh COCs. Taken together, our results demonstrate that we succeeded for the first time in the vitrification of mouse oocytes from C57BL/6J mice. Our findings will also contribute to the improvement of oocyte vitrification not only in animals but also in clinical applications for human infertility.
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Affiliation(s)
- Natsuki Kohaya
- Laboratory of Animal Reproduction, School of Veterinary Medicine, Azabu University, Sagamihara, Japan
| | | | - Junya Ito
- Laboratory of Animal Reproduction, School of Veterinary Medicine, Azabu University, Sagamihara, Japan
- Graduate School of Veterinary Sciences, Azabu University, Sagamihara, Japan
- * E-mail:
| | - Naomi Kashiwazaki
- Laboratory of Animal Reproduction, School of Veterinary Medicine, Azabu University, Sagamihara, Japan
- Graduate School of Veterinary Sciences, Azabu University, Sagamihara, Japan
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Chen C, Han S, Liu W, Wang Y, Huang G. Effect of vitrification on mitochondrial membrane potential in human metaphase II oocytes. J Assist Reprod Genet 2012; 29:1045-50. [PMID: 22915342 DOI: 10.1007/s10815-012-9848-1] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2012] [Accepted: 08/08/2012] [Indexed: 10/28/2022] Open
Abstract
OBJECTIVE The aim of this study was to evaluate the impact of vitrification on mitochondrial membrane potential (ΔΨm) in human metaphase II (MII) oocytes, and the changes of ΔΨm on thawed MII oocytes. METHODS MII oocytes were obtained from clinical IVF cycles when the oocytes were failed to fertilization within 24 h after insemination. All oocytes were randomly divided into 4 groups: non-frozen (fresh group), cultured for 0 h (0 h group), 2 h (2 h group) and 4 h (4 h group) after vitrification/thawing. All oocytes were stained with the ΔΨm-specific probe JC-1 and detected by laser scanning confocal microscope (LSCM) for mitochondrial analysis. RESULTS The ΔΨm of oocytes was significantly decreased in 0 h and 2 h groups when compared with fresh group (0.93, 1.09 vs 1.34, P < 0.05), but similar between 4 h group and fresh group (1.30 vs 1.34, P > 0.05). CONCLUSION In the vitrification/thawing process, the ΔΨm of MII oocytes could have temporally dynamic changes within 2 h after thawing but would be fully recovered after 4 h culture.
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Affiliation(s)
- Cui Chen
- Chongqing Medical University, 1 Yi Xue Yuan ST, Yu Zhong Dis, Chongqing 400016, China
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