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Hochi S. Cryodevices developed for minimum volume cooling vitrification of bovine oocytes. Anim Sci J 2022; 93:e13683. [PMID: 35075717 PMCID: PMC9286375 DOI: 10.1111/asj.13683] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2021] [Revised: 12/22/2021] [Accepted: 01/06/2022] [Indexed: 11/28/2022]
Abstract
Unfertilized bovine oocytes can be efficiently cryopreserved only when an extremely rapid cooling rate (>20,000°C/min) is applied to oocytes with a very limited amount of surrounding vitrification solution. This protocol is defined as minimum volume cooling (MVC) vitrification. Various types of cryodevices, such as open pulled straw, Cryoloop, and Cryotop, have been developed to accelerate the cooling efficacy. Furthermore, hollow fibers with nano-scale pores, triangle nylon mesh sheets, and multilayer silk fibroin sheets have been optimized for the loading of large quantities of oocytes and/or the subsequent removal of excess vitrification solution, without requiring skillful operation to transfer individual oocytes using fine capillaries. This article provides an up-to-date review of cryodevices suitable for the MVC vitrification of bovine oocytes at the immature (germinal vesicle-) and mature (metaphase II-) stages.
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Affiliation(s)
- Shinichi Hochi
- Faculty of Textile Science and TechnologyShinshu UniversityUedaNaganoJapan
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Yodrug T, Parnpai R, Hirao Y, Somfai T. Effect of vitrification at different meiotic stages on epigenetic characteristics of bovine oocytes and subsequently developing embryos. Anim Sci J 2021; 92:e13596. [PMID: 34309122 DOI: 10.1111/asj.13596] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2021] [Revised: 06/02/2021] [Accepted: 06/24/2021] [Indexed: 12/14/2022]
Abstract
Vitrification by the Cryotop method is frequently used for bovine oocyte cryopreservation. Nevertheless, vitrified oocytes still have reduced developmental competency compared with fresh counterparts. The objective of this study was to compare the effect of vitrification either at the germinal vesicle (GV) stage or at the metaphase II (MII) stage on epigenetic characteristics of bovine oocytes and subsequently developing embryos. Our results demonstrated that vitrification of oocytes at each meiotic stage significantly reduced blastocyst development after in vitro fertilization (IVF). However, vitrification at the GV stage resulted in higher blastocyst development than did vitrification at the MII stage. Irrespective of the meiotic stage, oocyte vitrification did not affect 5-methylcytosine (5mC) immunostaining intensity in oocyte DNA. However, at both stages, it caused a similar reduction of 5mC levels in DNA of subsequently developing blastocysts. Oocyte vitrification had no effect on the intensity of H3K9me3 and acH3K9 immunostaining in oocytes and subsequent blastocysts. The results suggest that irrespective of meiotic stage, oocyte vitrification alters global methylation in resultant embryos although such alteration in the oocytes was not detected. Oocyte vitrification might not influence histone acetylation and methylation in oocytes and resultant embryos. Vitrification at the immature stage was more advantageous for blastocyst development than at the mature stage.
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Affiliation(s)
- Thatawat Yodrug
- Embryo Technology and Stem Cell Research Center, School of Biotechnology, Institute of Agricultural Technology, Suranaree University of Technology, Nakhon Ratchasima, Thailand
| | - Rangsun Parnpai
- Embryo Technology and Stem Cell Research Center, School of Biotechnology, Institute of Agricultural Technology, Suranaree University of Technology, Nakhon Ratchasima, Thailand
| | - Yuji Hirao
- Animal Breeding and Reproduction Research Division, Institute of Livestock and Grassland Science (NILGS), National Agriculture and Food Research Organization (NARO), Tsukuba, Japan
| | - Tamas Somfai
- Animal Breeding and Reproduction Research Division, Institute of Livestock and Grassland Science (NILGS), National Agriculture and Food Research Organization (NARO), Tsukuba, Japan
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Vitrification of immature bovine oocytes in protein-free media: The impact of the cryoprotectant treatment protocol, base medium, and ovary storage. Theriogenology 2021; 172:47-54. [PMID: 34098168 DOI: 10.1016/j.theriogenology.2021.05.029] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2021] [Revised: 05/25/2021] [Accepted: 05/25/2021] [Indexed: 11/23/2022]
Abstract
Protein-free media are essential for the sanitary cryopreservation of bovine genetic resources. Our aim was to set up an optimized protocol for the vitrification of immature bovine oocytes using protein free media which can provide the highest embryo development rates and embryo quality after subsequent in vitro maturation and fertilization. First, using a protein free NCSU-37 as base medium we compared the efficacy of vitrification on Cryotop device with two different CPA protocols. "Protocol A″ employed a combination of ethylene glycol and propylene glycol as permeating cryoprotectants (pCPA) and equilibration in 4% total pCPA (2% ethylene glycol + 2% propylene glycol). "Protocol B″ employed a combination of ethylene glycol and DMSO and equilibration in 15% total pCPA (7.5% ethylene glycol + 7.5% DMSO). The 2 protocols were equally effective in terms of oocyte survival and subsequent development to the blastocyst stage. However, blastocyst cell numbers were significantly higher with "Protocol A". TCM-199 and NCSU-37 were equally effective as base media for vitrification. Vitrification with "Protocol A″ reduced the percentage of live oocytes and subsequent development to blastocyst stage but did not affect the hatching and cell numbers of blastocysts when compared to the non-treated group. CPA treatment of "Protocol A″ without cooling did not affect embryo development. Storage of ovaries in PBS at 15 °C for overnight reduced the percentage of surviving oocytes after vitrification but not their subsequent development to the blastocyst stage. In conclusion we established a vitrification protocol for the cryopreservation of immature bovine oocytes employing protein-free media which provided high blastocyst quality without noticeable toxic effects.
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Alfoteisy B, Singh J, Anzar M. Natural honey acts as a nonpermeating cryoprotectant for promoting bovine oocyte vitrification. PLoS One 2020; 15:e0238573. [PMID: 32877463 PMCID: PMC7467261 DOI: 10.1371/journal.pone.0238573] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2019] [Accepted: 08/19/2020] [Indexed: 11/18/2022] Open
Abstract
Sugars are commonly supplemented into vitrification solution to dehydrate cells in order to reduce the formation of fatal intracellular ice crystals. Natural honey is a mixture of 25 sugars (mainly fructose and glucose) that have different biological and pharmacological benefits. The present study was designed to determine if honey can be used as a nonpermeating cryoprotectant in vitrification of bovine oocytes. In the first experiment, denuded-MII oocytes were exposed to 0.25, 0.5, 1.0, 1.5 or 2.0 M of honey or sucrose. Natural honey and sucrose caused similar ooplasm dehydration. A significant relationship existed between time and ooplasm volume change (P < 0.05), during dehydration and rehydration phases, in both honey and sucrose solutions. In the second experiment, the immature cumulus-oocyte complexes (COCs) were vitrified in an EG/DMSO-based vitrification solution containing honey (0.5, 1 or 1.5 M) or sucrose (0.5 M) as a gold standard. The vitrified-warmed COCs were matured in vitro and evaluated for nuclear maturation. The maturation (MII) rate was greater in nonvitrified control (81%) than vitrified groups (54%, P < 0.05). In the third experiment, COCs were either remained nonvitrified (control) or vitrified in 1.0 M honey or 0.5 M sucrose, followed by IVM, IVF and IVC (for 9 days). Cleavage rate was greater in control (74%) than in vitrified groups (47%, P < 0.05), without significant difference between sugars. Blastocyst rate was 34, 13 and 3% in control, honey and sucrose groups respectively (P < 0.05). In conclusion, natural honey acted as a nonpermeating cryoprotectant in vitrification solution and improved the embryonic development in vitrified bovine COCs.
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Affiliation(s)
- Bilal Alfoteisy
- Department of Veterinary Biomedical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, SK, Canada
| | - Jaswant Singh
- Agriculture and Agri-Food Canada, Saskatoon Research and Development Center, Canadian Animal Genetic Resource Program, Saskatoon, SK, Canada
| | - Muhammad Anzar
- Department of Veterinary Biomedical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, SK, Canada
- Agriculture and Agri-Food Canada, Saskatoon Research and Development Center, Canadian Animal Genetic Resource Program, Saskatoon, SK, Canada
- * E-mail: ,
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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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Nakayama K, Chinen S, Teshima J, Tamada Y, Hirabayashi M, Hochi S. Silk fibroin sheet multilayer suitable for vitrification of in vitro-matured bovine oocytes. Theriogenology 2020; 145:109-114. [PMID: 32014616 DOI: 10.1016/j.theriogenology.2020.01.052] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2019] [Revised: 01/19/2020] [Accepted: 01/26/2020] [Indexed: 01/18/2023]
Abstract
Minimum volume cooling (MVC) procedure has been successfully applied to vitrify mammalian oocytes, but high skill of capillary pipetting is required to load the oocytes on a cryodevice with a minimal volume (<1 μL) of vitrification solution (VS). Here we report a novel cryodevice for bovine oocyte vitrification, silk fibroin (SF) sheet multilayer, of which spontaneous absorption property can eliminate pipette operation for removal of excess VS. Based on physical stability and scanning electron microscopic observation, the SF sheet prepared from 1.5% (wt/vol) fibroin solution was selected and layered around a polypropylene strip (0.1-mm thickness, 0.7-mm width, 10-mm depth). Ten denuded bovine mature oocytes were loaded onto the SF sheet multilayer with 2-3 μL of the VS, and then cooled rapidly by plunging into liquid nitrogen. Nylon mesh (NM) device with square opening 37-μm length of a side and commercially available Cryotop® (CT) device were used as controls, and the minimization of VS volume was performed by paper towel absorption and capillary aspiration, respectively. In SF, NM and CT groups, post-warming oocyte recovery rates were 99.5, 99.1 and 100%, and the morphological survival rates were 99.7, 94.5 and 99.0%, respectively. Subsequent IVF and 8-days IVC resulted in comparable blastocyst yields among the three groups (25.5, 25.0 and 26.1% in SF, NM and CT groups, respectively). These results suggest that SF sheet multilayer is a useful cryodevice for bovine matured oocytes in MVC vitrification because VS volume surrounding the oocytes can be easily minimized through its absorption property.
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Affiliation(s)
- Kenyu Nakayama
- Graduate School of Science and Technology, Shinshu University, Ueda, Nagano, 386-8567, Japan
| | - Shoichiro Chinen
- Graduate School of Science and Technology, Shinshu University, Ueda, Nagano, 386-8567, Japan
| | - Junki Teshima
- Graduate School of Science and Technology, Shinshu University, Ueda, Nagano, 386-8567, Japan
| | - Yasushi Tamada
- Graduate School of Science and Technology, Shinshu University, Ueda, Nagano, 386-8567, Japan; Faculty of Textile 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; Faculty of Textile Science and Technology, Shinshu University, Ueda, Nagano, 386-8567, Japan.
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Nylon mesh cryodevice for bovine mature oocytes, easily removable excess vitrification solution. Cryobiology 2019; 90:96-99. [DOI: 10.1016/j.cryobiol.2019.09.010] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2019] [Revised: 09/19/2019] [Accepted: 09/20/2019] [Indexed: 01/31/2023]
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Rosa CO, Bonato DV, Souza AK, Morotti F, Francisco RC, Basso AC, Martins MIM, Seneda MM. Improvement on the efficiency of doses per conception by using a semen extender in timed artificial insemination. Livest Sci 2019. [DOI: 10.1016/j.livsci.2019.01.014] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Khalili MA, Shahedi A, Ashourzadeh S, Nottola SA, Macchiarelli G, Palmerini MG. Vitrification of human immature oocytes before and after in vitro maturation: a review. J Assist Reprod Genet 2017; 34:1413-1426. [PMID: 28822010 DOI: 10.1007/s10815-017-1005-4] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2017] [Accepted: 07/21/2017] [Indexed: 12/27/2022] Open
Abstract
The use of immature oocytes subjected to in vitro maturation (IVM) opens interesting perspectives for fertility preservation where ovarian reserves are damaged by pathologies or therapies, as in PCO/PCOS and cancer patients. Human oocyte cryopreservation may offer some advantages compared to embryo freezing, such as fertility preservation in women at risk of losing fertility due to oncological treatment or chronic disease, egg donation and postponing childbirth. It also eliminates religious and/or other ethical, legal, and moral concerns of embryo freezing. In addition, a successful oocyte cryopreservation program could eliminate the need for donor and recipient menstrual cycle synchronization. Recent advances in vitrification technology have markedly improved the oocyte survival rate after warming, with fertilization and implantation rates comparable with those of fresh oocytes. Healthy live births can be achieved from the combination of IVM and vitrification, even if vitrification of in vivo matured oocytes is still more effective. Recently, attention is given to highlight whether vitrification procedures are more successful when performed before or after IVM, on immature GV-stage oocytes, or on in vitro matured MII-stage oocytes. In this review, we emphasize that, even if there are no differences in survival rates between oocytes vitrified prior to or post-IVM, reduced maturation rates of immature oocytes vitrified prior to IVM can be, at least in part, explained by underlying ultrastructural and biomolecular alterations.
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Affiliation(s)
- Mohammad Ali Khalili
- Research and Clinical Center for Infertility, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.,Department of Life, Health and Environmental Sciences, University of L'Aquila, L'Aquila, Italy
| | - Abbas Shahedi
- Department of Biology and Anatomical Sciences, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Sareh Ashourzadeh
- Research and Clinical Center for Infertility, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.,Afzalipour Clinical Center for Infertility, Kerman University of Medical Sciences, Kerman, Iran
| | - Stefania Annarita Nottola
- Department of Anatomy, Histology, Forensic Medicine and Orthopaedics, University of Rome La Sapienza, Rome, Italy
| | - Guido Macchiarelli
- Department of Life, Health and Environmental Sciences, University of L'Aquila, L'Aquila, Italy
| | - Maria Grazia Palmerini
- Department of Life, Health and Environmental Sciences, University of L'Aquila, L'Aquila, Italy.
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