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Liu Y, Jones C, Coward K. An investigation of the effects of laser-assisted zona pellucida drilling on the preimplantation mouse embryo and the competency of embryo implantation. F&S SCIENCE 2021; 2:316-329. [PMID: 35559857 DOI: 10.1016/j.xfss.2021.08.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2021] [Revised: 08/02/2021] [Accepted: 08/04/2021] [Indexed: 06/15/2023]
Abstract
OBJECTIVE To investigate the impact of laser-assisted zona pellucida (ZP) drilling on the mouse embryo, with particular emphasis on molecular mechanisms, and the efficiency of embryo attachment capability using an in vitro model of implantation. DESIGN Experimental study. SETTING Academic research laboratory. ANIMAL(S) C57BL/6JOlaHsd mouse embryos and B6C3F1 × B6D2F1 mouse embryos. INTERVENTION(S) Eight-cell stage mouse embryos were randomly assigned to a laser-assisted ZP drilling group (n = 343), ZP partial drilling group (n = 312), ZP quarter thinning group (n = 289), and control group (n = 353). Embryos were cultured in vitro from E2.5 to E4.5 for 48 hours. To investigate the capacity to implant, E4.5 embryos (laser-assisted drilling group [n = 46], ZP partial drilling group [n = 28], ZP quarter thinning group [n = 26], and control group [n = 36]) were then transferred onto an attachment model on the basis of Ishikawa cells and cultured for another 72 hours. MAIN OUTCOME MEASURE(S) Blastocyst formation, hatching status, and hatching morphology at E4.5. Blastocyst cell components, the extent of apoptosis in embryonic cells (DNA fragmentation, caspase-3 activation, and expression of apoptosis-related genes), the expression of heat shock protein 70, and differentially expressed genes (DEGs) generated by RNA sequencing. Fully hatched embryo rate and stable attachment rate in the in vitro attachment model. RESULT(S) There were no significant differences between the laser-assisted ZP manipulation groups and control group with respect to the formation of blastocysts, cell number, embryonic cell apoptosis, and cellular stress. All 3 of the laser-assisted ZP manipulations significantly increased the hatching rate at E4.5 compared with the control group, especially the ZP drilling group. However, only the ZP drilling group was associated with a significantly higher proportion of "8"-shaped hatching blastocysts. Furthermore, RNA sequencing identified 48 DEGs between blastocysts from the laser-assisted drilling group and control group; the metabolic pathways were significantly enriched in these DEGs. In addition, there were no significant differences between the laser-assisted ZP manipulation groups and control group with respect to the rate of stable attachment at E7.5, although a significantly higher entrapment rate was observed in the ZP drilling group. CONCLUSION(S) Laser-assisted ZP manipulations did not induce cellular apoptosis or stress in mouse blastocysts. Nevertheless, for the first time, we found that laser-assisted ZP drilling could alter the embryonic transcriptome and may affect metabolic activity. Furthermore, although laser-assisted ZP manipulations can enhance the initiation of hatching, it is evident that ZP drilling comes with a potential risk of embryo entrapment.
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Affiliation(s)
- Yaqiong Liu
- Nuffield Department of Women's and Reproductive Health, University of Oxford, Oxford, United Kingdom
| | - Celine Jones
- Nuffield Department of Women's and Reproductive Health, University of Oxford, Oxford, United Kingdom
| | - Kevin Coward
- Nuffield Department of Women's and Reproductive Health, University of Oxford, Oxford, United Kingdom.
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García-Jiménez M, Rink K, Mestres E, Vanrell I, Calderón G, Costa-Borges N. Evaluation of the impact of laser-assisted hatching techniques on the hatching process of mouse blastocysts using time-lapse microscopy. F&S SCIENCE 2021; 2:43-49. [PMID: 35559763 DOI: 10.1016/j.xfss.2020.12.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2020] [Revised: 12/15/2020] [Accepted: 12/17/2020] [Indexed: 06/15/2023]
Abstract
OBJECTIVE To study the effect of zona opening (ZO) and 2 zona thinning (ZT) techniques on the hatching process of mouse embryos using a last-generation laser system and time-lapse microscopy (TLM). DESIGN Prospective randomized study. SETTING Private research center. ANIMALS A total of 267 F1 hybrid (B6/CBA) mice embryos were included. INTERVENTION(S) Morulae were randomly selected and the zona pellucida (ZP) manipulated using a laser system according to 4 experimental groups: control (ZP intact, n = 59), ZO (25 μm hole, n = 70), ZT25 (25% perimeter thinned, n = 71), and ZT35 (35% perimeter thinned, n = 67). Embryo development was monitored by TLM until day 6. MAIN OUTCOME MEASURE(S) Time to first breach the ZP, hatching time, time to complete hatching, multiple breaching, multiple hatching, loss of cells, hole size, and embryo quality were analyzed. RESULT(S) No significant differences in the proportion of completely hatched embryos were found among groups. However, the time (average hours ± SD) to complete hatching was significantly delayed in the control group compared with all laser-treated groups: 118.3 ± 9.5 hours in the ZT25 group, 116.6 ± 8.7 hours in the ZT35 group, and 120.4 ± 9.9 hours in the ZO group. The applied laser techniques did not interfere with the quality of the blastocysts at day 5/6 of culture. CONCLUSION(S) ZO, ZT25, and ZT35 embryos hatched significantly earlier than the zona intact group without increasing the multiple hatching rates, suggesting an improvement of the hatching process. This study found that the pattern of the hatching process after ZT and ZO differs.
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Affiliation(s)
| | - Klaus Rink
- Embryotools R&D Centre Barcelona, Parc Científic de Barcelona, Barcelona, Spain
| | - Enric Mestres
- Embryotools R&D Centre Barcelona, Parc Científic de Barcelona, Barcelona, Spain
| | - Ivette Vanrell
- Embryotools R&D Centre Barcelona, Parc Científic de Barcelona, Barcelona, Spain
| | - Gloria Calderón
- Embryotools R&D Centre Barcelona, Parc Científic de Barcelona, Barcelona, Spain
| | - Nuno Costa-Borges
- Embryotools R&D Centre Barcelona, Parc Científic de Barcelona, Barcelona, Spain.
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Wang Y, Chen C, Liang J, Fan L, Liu D, Zhang X, Liu F. A comparison of the clinical effects of thinning and drilling on laser-assisted hatching. Lasers Med Sci 2021; 37:1-9. [PMID: 33442852 PMCID: PMC8803699 DOI: 10.1007/s10103-020-03230-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2020] [Accepted: 12/22/2020] [Indexed: 01/08/2023]
Abstract
To systematically investigate the effects of two methods used for laser-assisted hatching (LAH) on clinical outcomes after day 4 (D4) on frozen-embryo-transfer (FET) cycles. Data from 11471 infertile patients who underwent FET cycles between January 2014 and October 2018 was retrospectively analyzed. The 1410 patients who met the inclusion criteria were further categorized into two groups based on the hatching procedure used: the thinning laser-assisted hatching group (T-LAH, 716 patients), and the drilling laser-assisted hatching group (D-LAH, 694 patients). The baseline characteristics of the patients were consistent between the two groups. However, the rates of implantation and clinical pregnancy were significantly higher in the T-LAH group compared to the D-LAH group (32.73% vs. 29.09%, P < 0.01, and 50.98% vs. 43.95%, P < 0.01). The proportion of live birth was also higher in the T-LAH group, but the difference was insignificant (39.11% vs. 36.89%, P > 0.05). Moreover, there were no significant differences in rates of miscarriages, multiple pregnancies, ectopic pregnancies, preterm births, and congenital disabilities between the two groups. Nonetheless, significantly higher rates of implantation and pregnancy were reported in the T-LAH group compared to the D-LAH group among patients aged <35 years, patients with at least one previously failed cycle, and patients with an endometrial thickness of 8-10 mm. T-LAH is superior to D-LAH in improving clinical implantation and pregnancy outcomes in D4 FET, particularly in patients aged <35 years with at least one previously failed cycle or an endometrial thickness of 8-10 mm. The findings of this study provide theoretical support for clinical individualized diagnosis and treatment of patients with infertility.
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Affiliation(s)
- Yujiang Wang
- Department of Reproductive Medical Center, Guangdong Women and Children Hospital, No. 521 Xingnan Road, Panyu District, Guangzhou, 511442, Guangdong Province, China
| | - Chuangqi Chen
- Department of Reproductive Medical Center, Guangdong Women and Children Hospital, No. 521 Xingnan Road, Panyu District, Guangzhou, 511442, Guangdong Province, China
| | - Jiaying Liang
- Department of Reproductive Medical Center, Guangdong Women and Children Hospital, No. 521 Xingnan Road, Panyu District, Guangzhou, 511442, Guangdong Province, China
| | - Lin Fan
- Department of Reproductive Medical Center, Guangdong Women and Children Hospital, No. 521 Xingnan Road, Panyu District, Guangzhou, 511442, Guangdong Province, China
| | - Dun Liu
- Department of Reproductive Medical Center, Guangdong Women and Children Hospital, No. 521 Xingnan Road, Panyu District, Guangzhou, 511442, Guangdong Province, China
| | - Xiqian Zhang
- Department of Reproductive Medical Center, Guangdong Women and Children Hospital, No. 521 Xingnan Road, Panyu District, Guangzhou, 511442, Guangdong Province, China
| | - Fenghua Liu
- Department of Reproductive Medical Center, Guangdong Women and Children Hospital, No. 521 Xingnan Road, Panyu District, Guangzhou, 511442, Guangdong Province, China.
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The frequency of collapse as a predictor of feline blastocyst quality. Theriogenology 2020; 157:372-377. [PMID: 32862048 DOI: 10.1016/j.theriogenology.2020.08.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2020] [Revised: 08/08/2020] [Accepted: 08/09/2020] [Indexed: 11/23/2022]
Abstract
Domestic cats are frequently used as a research model for felid species that are threatened with extinction. Until now, the development of feline embryos has been evaluated using both classical observation methods and time-lapse monitoring (TLM). Blastocyst collapse observed using time-lapse cinematography is used as a predictor of blastocyst quality and is closely related to implantation potential. The aim of this study was to determine the relationship between the quality of domestic cat blastocysts obtained after in vitro fertilization and the frequency and duration of collapse, and of hatching. There was a significant difference in the average number of collapses and weak contractions between good and poor quality blastocysts. There was no significant difference between hatching and non-hatching blastocysts in terms of blastocyst cavity formation time or average number and duration of collapse. These results showed that the time of cavity formation was not related to blastocyst quality. The number of collapses and the occurrence of hatching were positively related to blastocyst quality, and poor quality blastocysts have, as a consequence, a reduced potential for implantation. TLM plays a significant role in cat embryo evaluation.
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Ilina IV, Khramova YV, Filatov MA, Sitnikov DS. Application of femtosecond laser microsurgery in assisted reproductive technologies for preimplantation embryo tagging. BIOMEDICAL OPTICS EXPRESS 2019; 10:2985-2995. [PMID: 31259068 PMCID: PMC6583350 DOI: 10.1364/boe.10.002985] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2019] [Revised: 05/16/2019] [Accepted: 05/18/2019] [Indexed: 05/19/2023]
Abstract
Femtosecond laser pulses were applied for precise alphanumeric code engraving on the zona pellucida (ZP) of mouse zygotes for individual embryo marking and their identification. The optimal range of laser pulse energies required for safe ZP microsurgery has been determined. ZP was marked with codes in three different planes to simplify the process of embryo identification. No decrease in developmental rates and no morphological changes of embryos post laser-assisted engraving have been observed. ZP thickness of embryos post laser-assisted code engraving has been shown to differ significantly from that of control group embryos at the hatching stage. Due to moderate ZP thinning as compared to its initial width at 0.5 dpc (days post coitum), readability of the code degrades slightly and it still remains recognizable even at hatching stage. Our results demonstrate that application of femtosecond laser radiation could be an effective approach for noninvasive direct embryo tagging, enabling embryo identification for the whole period of preimplantation development.
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Affiliation(s)
- Inna V Ilina
- Joint Institute for High Temperatures of the Russian Academy of Sciences, Izhorskaya st. 13, Bd. 2, Moscow, 125412, Russia
| | - Yulia V Khramova
- Faculty of Biology, Lomonosov Moscow State University, Leninskie Gory, 12-1, Moscow, 119234, Russia
| | - Maxim A Filatov
- Faculty of Biology, Lomonosov Moscow State University, Leninskie Gory, 12-1, Moscow, 119234, Russia
| | - Dmitry S Sitnikov
- Joint Institute for High Temperatures of the Russian Academy of Sciences, Izhorskaya st. 13, Bd. 2, Moscow, 125412, Russia
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Effect of OVOIL oil on B6D2F1 Mice Oogenesis. JOURNAL OF ANIMAL REPRODUCTION AND BIOTECHNOLOGY 2018. [DOI: 10.12750/jet.2018.33.4.205] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
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The impacts of laser zona thinning on hatching and implantation of vitrified-warmed mouse embryos. Lasers Med Sci 2018; 34:939-945. [DOI: 10.1007/s10103-018-2681-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2018] [Accepted: 11/02/2018] [Indexed: 10/27/2022]
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Blázquez R, Sánchez-Margallo FM, Álvarez V, Matilla E, Hernández N, Marinaro F, Gómez-Serrano M, Jorge I, Casado JG, Macías-García B. Murine embryos exposed to human endometrial MSCs-derived extracellular vesicles exhibit higher VEGF/PDGF AA release, increased blastomere count and hatching rates. PLoS One 2018; 13:e0196080. [PMID: 29684038 PMCID: PMC5912768 DOI: 10.1371/journal.pone.0196080] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2017] [Accepted: 04/05/2018] [Indexed: 01/08/2023] Open
Abstract
Endometrial Mesenchymal Stromal Cells (endMSCs) are multipotent cells with immunomodulatory and pro-regenerative activity which is mainly mediated by a paracrine effect. The exosomes released by MSCs have become a promising therapeutic tool for the treatment of immune-mediated diseases. More specifically, extracellular vesicles derived from endMSCs (EV-endMSCs) have demonstrated a cardioprotective effect through the release of anti-apoptotic and pro-angiogenic factors. Here we hypothesize that EV-endMSCs may be used as a co-adjuvant to improve in vitro fertilization outcomes and embryo quality. Firstly, endMSCs and EV-endMSCs were isolated and phenotypically characterized for in vitro assays. Then, in vitro studies were performed on murine embryos co-cultured with EV-endMSCs at different concentrations. Our results firstly demonstrated a significant increase on the total blastomere count of expanded murine blastocysts. Moreover, EV-endMSCs triggered the release of pro-angiogenic molecules from embryos demonstrating an EV-endMSCs concentration-dependent increase of VEGF and PDGF-AA. The release of VEGF and PDGF-AA by the embryos may indicate that the beneficial effect of EV-endMSCs could be mediating not only an increase in the blastocyst’s total cell number, but also may promote endometrial angiogenesis, vascularization, differentiation and tissue remodeling. In summary, these results could be relevant for assisted reproduction being the first report describing the beneficial effect of human EV-endMSCs on embryo development.
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Affiliation(s)
- Rebeca Blázquez
- Stem Cell Therapy Unit, Jesús Usón Minimally Invasive Surgery Centre, Cáceres, Spain
- CIBER de Enfermedades Cardiovasculares, Madrid, Spain
| | - Francisco Miguel Sánchez-Margallo
- Stem Cell Therapy Unit, Jesús Usón Minimally Invasive Surgery Centre, Cáceres, Spain
- CIBER de Enfermedades Cardiovasculares, Madrid, Spain
| | - Verónica Álvarez
- Stem Cell Therapy Unit, Jesús Usón Minimally Invasive Surgery Centre, Cáceres, Spain
| | - Elvira Matilla
- Assisted Reproduction Unit, Jesús Usón Minimally Invasive Surgery Centre, Cáceres, Spain
| | - Nuria Hernández
- Assisted Reproduction Unit, Jesús Usón Minimally Invasive Surgery Centre, Cáceres, Spain
| | - Federica Marinaro
- Stem Cell Therapy Unit, Jesús Usón Minimally Invasive Surgery Centre, Cáceres, Spain
| | | | - Inmaculada Jorge
- CIBER de Enfermedades Cardiovasculares, Madrid, Spain
- Centro Nacional de Investigaciones Cardiovasculares (CNIC), Madrid, Spain
| | - Javier G. Casado
- Stem Cell Therapy Unit, Jesús Usón Minimally Invasive Surgery Centre, Cáceres, Spain
- CIBER de Enfermedades Cardiovasculares, Madrid, Spain
- * E-mail:
| | - Beatriz Macías-García
- Assisted Reproduction Unit, Jesús Usón Minimally Invasive Surgery Centre, Cáceres, Spain
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Zhan S, Cao S, Du H, Sun Y, Li L, Ding C, Zheng H, Huang J. Parental genetic material and oxygen concentration affect hatch dynamics of mouse embryo in vitro. Reprod Biol Endocrinol 2018; 16:39. [PMID: 29679980 PMCID: PMC5911372 DOI: 10.1186/s12958-018-0356-8] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/30/2017] [Accepted: 04/16/2018] [Indexed: 11/15/2022] Open
Abstract
BACKGROUND Hatching is crucial for mammalian embryo implantation, since difficulties during this process can lead to implantation failure, ectopic pregnancy and consequent infertility. Despite years of intensive researches, how internal and external factors affecting embryo hatch are still largely unclear. METHODS The effects of parental genetic material and oxygen concentration on hatch process were examined. Fertilized and parthenogenetic mouse preimplantation embryos were cultured in vitro under 5 and 20% oxygen for 120 h. Zona pellucida drilling by Peizo micromanipulation were performed to resemble the breach by sperm penetration. RESULTS Firstly, parthenogenetic embryos had similarly high blastocyst developmental efficiency as fertilized embryos, but significantly higher hatch ratio than fertilized embryos in both O2 concentrations. 5% O2 reduced the hatch rate of fertilized embryos from 58.2 to 23.8%, but increased that of parthenogenetic embryos from 81.2 to 90.8% significantly. Analogously, 5% O2 decreased the ratio of Oct4-positive cells in fertilized blastocysts, whereas increased that in parthenogenetic blastocysts. Additionally, 5% O2 increased the total embryonic cell number in both fertilized and parthegenetic embryos, when compared to 20% O2, and the total cell number of fertilized embryos was also higher than that of parthegenetic embryos, despite O2 concentration. Real-time PCR revealed that the expression of key genes involving in MAPK pathway and superoxide dismutase family might contribute to preimplantation development and consequent blastocyst hatch in vitro. Finally, we showed that fertilized and parthenogenetic embryos have diverse hatch dynamics in vitro, although the zona pellucida integrity is not the main reason for their mechanistic differences. CONCLUSION Both parental genetic material and O2 concentration, as the representative of intrinsic and extrinsic factors respectively, have significant impacts on mouse preimplantation development and subsequent hatch dynamics, probably by regulating the gene expression involving in MAPK pathway and superoxide dismutase family to control embryonic cell proliferation and allocation of ICM cells.
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Affiliation(s)
- Shaoquan Zhan
- 0000 0004 1758 4591grid.417009.bCenter for Reproductive Medicine, Key Laboratory for Reproductive Medicine of Guangdong Province, Key Laboratory for Major Obstetric Diseases of Guangdong Province, and Key Laboratory for Reproduction and Genetics of Guangdong Higher Education Institutes, the Third Affiliated Hospital of Guangzhou Medical University, Guangzhou, 510150 China
| | - Shanbo Cao
- 0000 0004 1758 4591grid.417009.bCenter for Reproductive Medicine, Key Laboratory for Reproductive Medicine of Guangdong Province, Key Laboratory for Major Obstetric Diseases of Guangdong Province, and Key Laboratory for Reproduction and Genetics of Guangdong Higher Education Institutes, the Third Affiliated Hospital of Guangzhou Medical University, Guangzhou, 510150 China
- Beijing Acorndx Biotechnology Co. Ltd, Beijing, 100176 China
| | - Hongzi Du
- 0000 0004 1758 4591grid.417009.bCenter for Reproductive Medicine, Key Laboratory for Reproductive Medicine of Guangdong Province, Key Laboratory for Major Obstetric Diseases of Guangdong Province, and Key Laboratory for Reproduction and Genetics of Guangdong Higher Education Institutes, the Third Affiliated Hospital of Guangzhou Medical University, Guangzhou, 510150 China
| | - Yuan Sun
- 0000 0004 1758 4591grid.417009.bCenter for Reproductive Medicine, Key Laboratory for Reproductive Medicine of Guangdong Province, Key Laboratory for Major Obstetric Diseases of Guangdong Province, and Key Laboratory for Reproduction and Genetics of Guangdong Higher Education Institutes, the Third Affiliated Hospital of Guangzhou Medical University, Guangzhou, 510150 China
| | - Li Li
- 0000 0004 1758 4591grid.417009.bCenter for Reproductive Medicine, Key Laboratory for Reproductive Medicine of Guangdong Province, Key Laboratory for Major Obstetric Diseases of Guangdong Province, and Key Laboratory for Reproduction and Genetics of Guangdong Higher Education Institutes, the Third Affiliated Hospital of Guangzhou Medical University, Guangzhou, 510150 China
| | - Chenhui Ding
- 0000 0001 2360 039Xgrid.12981.33Key Laboratory of Reproductive Medicine of Guangdong Province, School of Life Sciences and the First Affiliated Hospital, Sun Yat-sen University, Guangzhou, 510275 China
| | - Haiyan Zheng
- 0000 0004 1758 4591grid.417009.bCenter for Reproductive Medicine, Key Laboratory for Reproductive Medicine of Guangdong Province, Key Laboratory for Major Obstetric Diseases of Guangdong Province, and Key Laboratory for Reproduction and Genetics of Guangdong Higher Education Institutes, the Third Affiliated Hospital of Guangzhou Medical University, Guangzhou, 510150 China
- Guangzhou, People’s Republic of China
| | - Junjiu Huang
- 0000 0004 1758 4591grid.417009.bCenter for Reproductive Medicine, Key Laboratory for Reproductive Medicine of Guangdong Province, Key Laboratory for Major Obstetric Diseases of Guangdong Province, and Key Laboratory for Reproduction and Genetics of Guangdong Higher Education Institutes, the Third Affiliated Hospital of Guangzhou Medical University, Guangzhou, 510150 China
- 0000 0001 2360 039Xgrid.12981.33Key Laboratory of Reproductive Medicine of Guangdong Province, School of Life Sciences and the First Affiliated Hospital, Sun Yat-sen University, Guangzhou, 510275 China
- Guangzhou, People’s Republic of China
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Kim HJ, Park SB, Yang JB, Choi YB, Lee KH. Effects of laser-assisted hatching and exposure time to vitrification solution on mouse embryo development. Clin Exp Reprod Med 2018; 44:193-200. [PMID: 29376016 PMCID: PMC5783916 DOI: 10.5653/cerm.2017.44.4.193] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2017] [Revised: 09/03/2017] [Accepted: 10/18/2017] [Indexed: 11/22/2022] Open
Abstract
Objective This study was conducted to investigate the efficacy of laser-assisted hatching (LAH) and various vitrification times for embryonic development and blastocyst cell numbers. Methods First, 2-cell and 8-cell embryos were collected by flushing out the oviducts. In the control groups, they were vitrified for 8 or 10 minutes without LAH. The LAH groups underwent quarter laser zona thinning-assisted hatching before vitrification (4, 6, and 8 minutes or 4, 7, and 10 minutes, respectively). After incubation, double-immunofluorescence staining was performed. Results The hatched blastocyst rate 72 hours after the 2-cell embryos were thawed was significantly higher in the 2LAH-ES8 group (33.3%) than in the other groups (p<0.05). In the control-8 group (22.1±4.6), the cell number of the inner cell mass was higher than in the LAH groups (p<0.05). The number of trophectoderm cells was higher in the 2LAH-ES6 group (92.8±8.9) than in the others (p<0.05). The hatched blastocyst rate 48 hours after the 8-cell embryos were thawed was higher in the 8LAH-ES4 group (45.5%) than in the other groups, but not significantly. The inner cell mass cell number was highest in the 8LAH-ES7 group (19.5±5.1, p<0.05). The number of trophectoderm cells was higher in the 8LAH-ES10 group (73.2±12.1) than in the other groups, but without statistical significance. Conclusion When LAH was performed, 2-cell embryos with large blastomeres had a lower hatched blastocyst rate when the exposure to vitrification solution was shorter. Conversely, 8-cell embryos with small blastomere had a higher hatched blastocyst rate when the exposure to vitrification solution was shorter.
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Affiliation(s)
- Hye Jin Kim
- Department of Obstetrics and Gynecology, Chungnam National University Hospital, Daejeon, Korea
| | - Sung Baek Park
- Mirae i Infertility Clinic, Mirae Ladies Hospital, Daejeon, Korea
| | - Jung Bo Yang
- Department of Obstetrics and Gynecology, Chungnam National University Hospital, Daejeon, Korea
| | - Young Bae Choi
- Mirae i Infertility Clinic, Mirae Ladies Hospital, Daejeon, Korea
| | - Ki Hwan Lee
- Department of Obstetrics and Gynecology, Chungnam National University Hospital, Daejeon, Korea
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Kim HJ, Lee KH, Park SB, Choi YB, Yang JB. The effect of artificial shrinkage and assisted hatching on the development of mouse blastocysts and cell number after vitrification. Clin Exp Reprod Med 2015; 42:94-100. [PMID: 26473108 PMCID: PMC4604299 DOI: 10.5653/cerm.2015.42.3.94] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2015] [Revised: 07/13/2015] [Accepted: 08/07/2015] [Indexed: 11/06/2022] Open
Abstract
Objective The goal of this study was to ascertain optimal assisted hatching (AH) method in frozen embryo transfer. We compared the effect of depending on whether mechanical or laser-AH was performed before or after the vitrification of embryo development rate and blastocyst cell numbers. Methods In order to induce superovulation, pregnant mare's serum gonadotropin followed by human chorionic gonadotropin were injected into 4- to 5-week-old female mice. 2-cell embryos were then collected by flushing out the oviducts. The Expanded blastocysts were recovered after the collected embryos were incubated for 48 hours, and were then subjected to artificial shrinkage (AS) and cross-mechanical AH (cMAH) or quarter-laser zona thinning-AH (qLZT-AH) were carried out using the expanded blastocysts before or after vitrification. After 48 hours of incubation, followed by vitrification and thawing (V-T), and blastocysts were fluorescence stained and observed. Results The rate of formation of hatched blastocysts after 24 and 72 hours of incubation was significantly higher in the AS/qLZT-AH/V-T group than in the other groups (p<0.05). The cell number of the inner cell mass was higher in AS/V-T/non-AH and AS/V-T/cMAH groups than those of others (p<0.05). In the control group, the number of trophectoderm and the total cell number were higher than in the AS-AH group (p<0.05). Conclusion The above results suggest that AS and AH in vitrification of expanded blastocysts lead to the more efficient formation of hatched blastocysts in mice.
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Affiliation(s)
- Hye Jin Kim
- Department of Obstetrics and Gynecology, Chungnam National University Hospital, Daejeon, Korea
| | - Ki Hwan Lee
- Department of Obstetrics and Gynecology, Chungnam National University Hospital, Daejeon, Korea
| | | | | | - Jung Bo Yang
- Department of Obstetrics and Gynecology, Chungnam National University Hospital, Daejeon, Korea
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