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Chen C, Huang Z, Dong S, Ding M, Li J, Wang M, Zeng X, Zhang X, Sun X. Calcium signaling in oocyte quality and functionality and its application. Front Endocrinol (Lausanne) 2024; 15:1411000. [PMID: 39220364 PMCID: PMC11361953 DOI: 10.3389/fendo.2024.1411000] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/02/2024] [Accepted: 07/29/2024] [Indexed: 09/04/2024] Open
Abstract
Calcium (Ca2+) is a second messenger for many signal pathways, and changes in intracellular Ca2+ concentration ([Ca2+]i) are an important signaling mechanism in the oocyte maturation, activation, fertilization, function regulation of granulosa and cumulus cells and offspring development. Ca2+ oscillations occur during oocyte maturation and fertilization, which are maintained by Ca2+ stores and extracellular Ca2+ ([Ca2+]e). Abnormalities in Ca2+ signaling can affect the release of the first polar body, the first meiotic division, and chromosome and spindle morphology. Well-studied aspects of Ca2+ signaling in the oocyte are oocyte activation and fertilization. Oocyte activation, driven by sperm-specific phospholipase PLCζ, is initiated by concerted intracellular patterns of Ca2+ release, termed Ca2+ oscillations. Ca2+ oscillations persist for a long time during fertilization and are coordinately engaged by a variety of Ca2+ channels, pumps, regulatory proteins and their partners. Calcium signaling also regulates granulosa and cumulus cells' function, which further affects oocyte maturation and fertilization outcome. Clinically, there are several physical and chemical options for treating fertilization failure through oocyte activation. Additionally, various exogenous compounds or drugs can cause ovarian dysfunction and female infertility by inducing abnormal Ca2+ signaling or Ca2+ dyshomeostasis in oocytes and granulosa cells. Therefore, the reproductive health risks caused by adverse stresses should arouse our attention. This review will systematically summarize the latest research progress on the aforementioned aspects and propose further research directions on calcium signaling in female reproduction.
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Affiliation(s)
- Chen Chen
- Institute of Reproductive Medicine, Medical School, Nantong University, Nantong, China
| | - Zefan Huang
- Institute of Reproductive Medicine, Medical School, Nantong University, Nantong, China
| | - Shijue Dong
- Institute of Reproductive Medicine, Medical School, Nantong University, Nantong, China
| | - Mengqian Ding
- Institute of Reproductive Medicine, Medical School, Nantong University, Nantong, China
| | - Jinran Li
- Center for Reproductive Medicine, Affiliated Hospital of Nantong University, Nantong University, Nantong, China
| | - Miaomiao Wang
- Institute of Reproductive Medicine, Medical School, Nantong University, Nantong, China
| | - Xuhui Zeng
- Institute of Reproductive Medicine, Medical School, Nantong University, Nantong, China
| | - Xiaoning Zhang
- Institute of Reproductive Medicine, Medical School, Nantong University, Nantong, China
| | - Xiaoli Sun
- Center for Reproductive Medicine, Affiliated Hospital of Nantong University, Nantong University, Nantong, China
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Xue L, Wang S, Wei P, Liu H, Mao X, Qin J, Li Y, Zhang X, Li Z, Huang Y, Chen L, Shi W, Liu L. Early rescue oocyte activation at 5 h post-ICSI is a useful strategy for avoiding unexpected fertilization failure and low fertilization in ICSI cycles. Front Endocrinol (Lausanne) 2024; 14:1301505. [PMID: 38239979 PMCID: PMC10794723 DOI: 10.3389/fendo.2023.1301505] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/26/2023] [Accepted: 12/12/2023] [Indexed: 01/22/2024] Open
Abstract
Introduction Attempts to artificially activate unfertilized oocytes at 24 h post intracytoplasmic sperm injection (ICSI) have generally resulted in poor outcomes. This study aims to explore a new strategy for early judgement and rescue activation of unfertilized oocytes at 5 h post ICSI to avoid unexpected fertilization failure (UFF) or unexpected low fertilization (ULF) in ICSI cycles. Methods Firstly, time-lapse data from 278 ICSI cycles were retrospectively analyzed to establish an indicator for fertilization failure prediction. Secondly, 14 UFF and 20 ULF cycles were enrolled for an observational study, early rescue oocyte activation (EROA) was performed on oocytes without post-ICSI Pb2 extrusion to investigate fertilization efficiency, embryo development and clinical outcomes. Results The average time to Pb2 extrusion post-ICSI was 3.03±1.21 h, 95.54% of oocytes had extruded Pb2 before 5 h, and the sensitivity and specificity for monitoring Pb2 extrusion at 5 h by time-lapse imaging to predict fertilization were 99.59% and 99.78%, respectively. Early rescue activation of oocytes with no Pb2 extrusion resulted in acceptable fertilization and embryo developmental outcomes, in terms of the fertilization rate (75.00, 72.99%), 2PN fertilization rate (61.36, 56.93%), good-quality embryo rate (42.59, 50.00%), blastocyst formation rate (48.28, 46.03%), good-quality blastocyst rate (34.48, 33.33%), and oocyte utilization rate (36.36, 27.74%), for both UFF and ULF cycles. The clinical pregnancy, embryo implantation, and early miscarriage rates in the rescue oocyte activation group did not significantly differ from those in the Pb2 extrusion group. Fourteen unexpected fertilization failures and 20 low fertilization ICSI cycles were rescued and resulted in clinical pregnancy rates of 40.00% (4/10) and 57.14% (8/14), respectively. Conclusions This study demonstrates that monitoring Pb2 extrusion by time-lapse imaging can accurately predict fertilization outcomes, suggesting that early rescue oocyte activation at 5 h post ICSI is an effective strategy for avoiding unexpected fertilization failure and low fertilization in ICSI cycles.
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Affiliation(s)
- Lintao Xue
- Reproductive Medical and Genetic Center, The People’s Hospital of GuangXi Zhuang Autonomous Region, Nanning, China
| | | | | | | | | | | | | | | | | | | | | | | | - Liling Liu
- Reproductive Medical and Genetic Center, The People’s Hospital of GuangXi Zhuang Autonomous Region, Nanning, China
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Suto A, Yano Y, Yamamoto Y, Noguchi H, Takeda A, Yamamoto S, Kagawa T, Yoshida K, Hinokio K, Kuwahara A, Yasui T, Iwasa T. Effects of activation with a Ca ionophore and roscovitine on the development of human oocytes that failed to fertilize after ICSI. THE JOURNAL OF MEDICAL INVESTIGATION 2023; 70:321-324. [PMID: 37940514 DOI: 10.2152/jmi.70.321] [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] [Indexed: 11/10/2023]
Abstract
OBJECTIVE The effects of oocyte activation with a Ca ionophore and roscovitine (Ca+R), a selective inhibitor of M-phase promoting factor, on unfertilized oocytes after intracytoplasmic sperm injection (ICSI) or testicular sperm extraction (TESE)-ICSI were evaluated. METHOD Oocytes without pronuclei at 18 hours after ICSI were judged to be unfertilized and were exposed to the Ca ionophore A23187 (5 ?M) with or without roscovitine (50 ?M). The activation rate was measured 3, 7, and 18 hours later. Oocytes with two polar bodies and two pronuclei with a sperm tail were judged to have been activated. RESULTS At 18 hours, the activation rates in the control, Ca ionophore, and Ca+R groups were 3.5% (4/112), 26.9% (7/26), and 32.1% (17/53), respectively. The activation rate of the Ca+R group was significantly higher than that of the control and similar to that of the Ca ionophore group. Among the oocytes that remained unfertilized after TESE-ICSI, the activation rates of the Ca ionophore and Ca+R groups were 22.2% (2/9) and 43.8% (7/16), respectively. CONCLUSIONS Sequential treatment with an Ca ionophore and roscovitine activates oocytes that remain unfertilized after ICSI. In TESE-ICSI, the activation rate tended to be increased by the co-administration of roscovitine with a Ca ionophore. J. Med. Invest. 70 : 321-324, August, 2023.
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Affiliation(s)
- Ayako Suto
- School of Medicine, Tokushima University, Tokushima, Japan
| | - Yuya Yano
- School of Medicine, Tokushima University, Tokushima, Japan
| | - Yuri Yamamoto
- School of Medicine, Tokushima University, Tokushima, Japan
| | - Hiroki Noguchi
- School of Medicine, Tokushima University, Tokushima, Japan
| | - Asuka Takeda
- School of Medicine, Tokushima University, Tokushima, Japan
| | - Shota Yamamoto
- School of Medicine, Tokushima University, Tokushima, Japan
- Department of Renal and Genitourinary Surgery, Graduate School of Medicine, Hokkaido University, Hokkaido, Japan
| | | | - Kanako Yoshida
- School of Medicine, Tokushima University, Tokushima, Japan
| | - Kenji Hinokio
- School of Medicine, Tokushima University, Tokushima, Japan
| | - Akira Kuwahara
- School of Medicine, Tokushima University, Tokushima, Japan
| | | | - Takeshi Iwasa
- School of Medicine, Tokushima University, Tokushima, Japan
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Wang J, Zhang J, Sun X, Lin Y, Cai L, Cui Y, Liu J, Liu M, Yang X. Novel bi-allelic variants in ACTL7A are associated with male infertility and total fertilization failure. Hum Reprod 2021; 36:3161-3169. [PMID: 34727571 DOI: 10.1093/humrep/deab228] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2021] [Revised: 09/04/2021] [Indexed: 02/07/2023] Open
Abstract
STUDY QUESTION What are the genetic causes of total fertilization failure (TFF) in a proband suffering from male infertility? SUMMARY ANSWER Novel compound heterozygous variants (c.[463C>T];[1084G>A], p.[(Arg155Ter)];[(Gly362Arg)]) in actin-like protein 7A (ACTL7A) were identified as a causative genetic factor for human TFF. WHAT IS KNOWN ALREADY ACTL7A, an actin-related protein, is essential for spermatogenesis. ACTL7A variants have been reported to cause early embryonic arrest in humans but have not been studied in human TFF. STUDY DESIGN, SIZE, DURATION We recruited a non-consanguineous family whose son was affected by infertility characterized by TFF after ICSI. Whole-exome sequencing was used to identify the potential pathogenic variants. Artificial oocyte activation (AOA) after ICSI was performed to overcome TFF and any resulting pregnancy was followed up. PARTICIPANTS/MATERIALS, SETTING, METHODS Sanger sequencing was performed to validate the variants. Pathogenicity of the identified variants was predicted by in silico tools. The ultrastructure of spermatozoa was studied by transmission electron microscopy (TEM). Immunofluorescence staining and western blotting were used to investigate the mechanism of the variants on the affected spermatozoa. MAIN RESULTS AND THE ROLE OF CHANCE Novel compound heterozygous variants in ACTL7A (c.[463C>T];[1084G>A], p.[(Arg155Ter)];[(Gly362Arg)]) were identified in a family with TFF after ICSI. In silico analysis predicted that the variants lead to a disease-causing protein. TEM showed that the ACTL7A variants caused ultrastructural defects in the acrosome and perinuclear theca. Protein expression of ACTL7A and phospholipase C zeta, a key sperm-borne oocyte activation factor, was significantly reduced in the affected sperm compared to healthy controls, suggesting that the ACLT7A variants lead to an oocyte activation deficiency and TFF. AOA by calcium ionophore (A23187) after ICSI successfully rescued the TFF and achieved a live birth for the patient with ACTL7A variants. LIMITATIONS, REASONS FOR CAUTION Given the rarity of sperm-associated TFF, only one family with an only child carrying the ACTL7A variants was found. In addition, the TFF phenotype was not assessed in two or more ICSI cycles, due to the intervention in ICSI with AOA after one failed ICSI cycle. Further studies should validate the ACTL7A variants and its effect on male infertility in larger independent cohorts. WIDER IMPLICATIONS OF THE FINDINGS : Our findings revealed a critical role of ACTL7A in male fertility and identified bi-allelic variants in ACTL7A associated with human TFF, which expands the genetic spectrum of TFF and supports the genetic diagnosis of TFF patients. We also rescued TFF by AOA and obtained a healthy live birth, which provides a potentially effective intervention for patients with ACTL7A pathogenic variants. STUDY FUNDING/COMPETING INTEREST(S) This work was supported by the National Natural Science Foundation of China (81971374 and 81401267). No conflicts of interest were declared. TRIAL REGISTRATION NUMBER N/A.
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Affiliation(s)
- Jing Wang
- State Key Laboratory of Reproductive Medicine, The Center for Clinical Reproductive Medicine, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Jintao Zhang
- State Key Laboratory of Reproductive Medicine, Department of Histology and Embryology, School of Basic Medical Sciences, Nanjing Medical University, Nanjing, China
| | - Xueping Sun
- State Key Laboratory of Reproductive Medicine, The Center for Clinical Reproductive Medicine, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Yuting Lin
- State Key Laboratory of Reproductive Medicine, The Center for Clinical Reproductive Medicine, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Lingbo Cai
- State Key Laboratory of Reproductive Medicine, The Center for Clinical Reproductive Medicine, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Yugui Cui
- State Key Laboratory of Reproductive Medicine, The Center for Clinical Reproductive Medicine, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Jiayin Liu
- State Key Laboratory of Reproductive Medicine, The Center for Clinical Reproductive Medicine, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Mingxi Liu
- State Key Laboratory of Reproductive Medicine, Department of Histology and Embryology, School of Basic Medical Sciences, Nanjing Medical University, Nanjing, China
| | - Xiaoyu Yang
- State Key Laboratory of Reproductive Medicine, The Center for Clinical Reproductive Medicine, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
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Shibahara T, Fukasaku Y, Hayashi N, Miyazaki N, Kawato H, Minoura H. Early rescue oocyte activation for activation-impaired oocytes with no second polar body extrusion after intracytoplasmic sperm injection. J Assist Reprod Genet 2021; 38:1061-1068. [PMID: 33619678 DOI: 10.1007/s10815-021-02089-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2020] [Accepted: 01/25/2021] [Indexed: 11/27/2022] Open
Abstract
PURPOSE When rescue artificial oocyte activation (ROA) is performed on the day after intracytoplasmic sperm injection (ICSI) or later, embryonic development is poor and seldom results in live births. The efficacy of an early ROA after ICSI is unclear. Is early ROA effective in rescuing unfertilized oocytes that have not undergone second polar body extrusion several hours after ICSI? METHODS We performed retrospective cohort study between October 2016 and September 2019, targeting 2891 oocytes in 843 cycles when ICSI was performed. We performed ROA with calcium ionophore on 395 of the 475 oocytes with no second polar extrusion 2.5-6 h after ICSI. RESULTS The normal fertilization rate of ROA oocytes was significantly higher than non-ROA oocytes (65.8% vs 6.7%, P < 0.001). The blastocyst development rate in ROA oocytes was significantly lower than spontaneously activated oocytes (48.9% vs 67.2%, P < 0.001). The ROA oocyte implantation rate did not significantly differ from the spontaneously activated oocytes (36.0% vs 41.2%). We observed no differences in the implantation rates and blastocyst development rates over the 2.5-6 h from ICSI until ROA. CONCLUSION Early ROA is effective, and the optimal timing appears to be 2.5-6 h after ICSI.
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Affiliation(s)
- Takashi Shibahara
- Minoura Ladies Clinic, 3-9-17 Isoyama, Suzuka, Mie, 510-0256, Japan.
| | - Yuu Fukasaku
- Minoura Ladies Clinic, 3-9-17 Isoyama, Suzuka, Mie, 510-0256, Japan
| | - Naoko Hayashi
- Minoura Ladies Clinic, 3-9-17 Isoyama, Suzuka, Mie, 510-0256, Japan
| | - Nozomi Miyazaki
- Minoura Ladies Clinic, 3-9-17 Isoyama, Suzuka, Mie, 510-0256, Japan
| | - Hiroaki Kawato
- Kawato Ladies Clinic, 1-16-11 Betumei, Yokkaichi, Mie, 510-0007, Japan
| | - Hiroyuki Minoura
- Minoura Ladies Clinic, 3-9-17 Isoyama, Suzuka, Mie, 510-0256, Japan
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Xu Z, Yao G, Niu W, Fan H, Ma X, Shi S, Jin H, Song W, Sun Y. Calcium Ionophore (A23187) Rescues the Activation of Unfertilized Oocytes After Intracytoplasmic Sperm Injection and Chromosome Analysis of Blastocyst After Activation. Front Endocrinol (Lausanne) 2021; 12:692082. [PMID: 34335469 PMCID: PMC8320372 DOI: 10.3389/fendo.2021.692082] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/08/2021] [Accepted: 06/28/2021] [Indexed: 11/13/2022] Open
Abstract
Calcium is a crucial factor in regulating the biological behavior of cells. The imbalance of calcium homeostasis in cytoplasm will cause abnormal behavior of cells and the occurrence of diseases. In intracytoplasmic sperm injection (ICSI) cycle, the dysfunction of oocyte activation caused by insufficient release of Ca2+ from endoplasmic reticulum is one of the main reasons for repeated fertilization failure. Calcium ionophore (A23187) is a highly selective calcium ionophore, which can form stable complex with Ca2+ and pass through the cell membrane at will, effectively increasing intracellular Ca2+ levels. It has been reported that calcium ionophore (A23187) can activate oocytes and obtain normal embryos. However, there are few studies on unfertilized oocytes after calcium ionophore (A23187) rescue activation in ICSI cycle. The purpose of this study was to analyze the effects of calcium ionophore (A23187) rescue activation on the activation of unfertilized oocytes, embryonic development potential, embryonic development timing and chromosomal aneuploidy, and to compare and analyze the clinical data of patients with calcium ionophore (A23187) activation in clinical application. The results showed that a certain proportion of high-quality blastocysts with normal karyotype could be obtained after calcium ionophore (A23187) rescue activation of unfertilized oocytes, and it did not have a significant effect on the timing of embryo development. In clinical practice, direct activation with calcium ionophore (A23187) after ICSI was better than rescue activation the next day. In conclusions, the studies on the effectiveness and safety of calcium ionophore (A23187) rescue activation for oocytes with ICSI fertilization failure can enable some patients to obtain usable, high-quality embryos during the first ICSI cycle.
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Affiliation(s)
- Ziwen Xu
- Center for Reproductive Medicine, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
- Henan Key Laboratory of Reproduction and Genetics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Guidong Yao
- Center for Reproductive Medicine, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
- Henan Key Laboratory of Reproduction and Genetics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
- *Correspondence: Guidong Yao, ; Yingpu Sun,
| | - Wenbin Niu
- Center for Reproductive Medicine, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
- Henan Key Laboratory of Reproduction and Genetics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Huiying Fan
- Center for Reproductive Medicine, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
- Henan Key Laboratory of Reproduction and Genetics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Xueshan Ma
- Center for Reproductive Medicine, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
- Henan Key Laboratory of Reproduction and Genetics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Senlin Shi
- Center for Reproductive Medicine, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
- Henan Key Laboratory of Reproduction and Genetics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Haixia Jin
- Center for Reproductive Medicine, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
- Henan Key Laboratory of Reproduction and Genetics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Wenyan Song
- Center for Reproductive Medicine, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
- Henan Key Laboratory of Reproduction and Genetics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Yingpu Sun
- Center for Reproductive Medicine, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
- Henan Key Laboratory of Reproduction and Genetics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
- *Correspondence: Guidong Yao, ; Yingpu Sun,
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Jeve YB, Potdar N, Blower JA, Gelbaya T. Strategies to improve fertilisation rates with assisted conception: a systematic review. HUM FERTIL 2017; 21:229-247. [PMID: 28545312 DOI: 10.1080/14647273.2017.1324182] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Successful fertilisation is one of the key steps determining success of assisted conception. Various factors including sperm or oocyte pathology and environmental factors have a significant impact on fertilisation rates. This systematic review is aimed to evaluate the existing evidence about factors affecting fertilisation and strategies to improve fertilisation rates. A literature search was performed using Ovid MEDLINE ® (Jan 1950-April 2016), EMBASE (Jan 1950-April 2016), Ovid OLDMEDLINE ®, Pre-MEDLINE (Jan 1950-April 2016) and the Cochrane Library. Relevant key words were used to combine sets of results and a total 243 papers were screened. Only qualitative analysis was performed, as there was major heterogeneity in study design and methodology for quantitative synthesis. Factors affecting fertilisation were divided into sperm- and oocyte-related factors. The methods to improve fertilisation rates were grouped together based on the approach used to improve fertilisation rates. Optimising laboratory condition and procedural effects in techniques is associated with improved fertilisation rates. Various techniques are described to improve fertilisation rates including assisted oocyte activation, physiological intracytoplasmic sperm injection (PICSI) and intracytoplasmic morphologically selected sperm injection (IMSI). This review highlights the promising strategies under research to enhance fertilisation rates. Adequately powered multicentre randomised trials are required to evaluate these techniques before considering clinical application.
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Affiliation(s)
- Yadava Bapurao Jeve
- a Leicester Fertility Centre , University Hospitals of Leicester , Leicester , UK
| | - Neelam Potdar
- a Leicester Fertility Centre , University Hospitals of Leicester , Leicester , UK.,b Reproductive Sciences Section , University of Leicester , Leicester , UK
| | - Jane A Blower
- a Leicester Fertility Centre , University Hospitals of Leicester , Leicester , UK
| | - Tarek Gelbaya
- a Leicester Fertility Centre , University Hospitals of Leicester , Leicester , UK
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Economou KA, Christopikou D, Tsorva E, Davies S, Mastrominas M, Cazlaris H, Koutsilieris M, Angelogianni P, Loutradis D. The combination of calcium ionophore A23187 and GM-CSF can safely salvage aged human unfertilized oocytes after ICSI. J Assist Reprod Genet 2016; 34:33-41. [PMID: 27743290 DOI: 10.1007/s10815-016-0823-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2016] [Accepted: 09/27/2016] [Indexed: 11/30/2022] Open
Abstract
PURPOSE Artificial oocyte activation using calcium ionophores and enhancement of embryonic developmental potential by the granulocyte-macrophage colony-stimulating factor (GM-CSF) have already been reported. In this study, we evaluated the synergistic effect of these two methods on aged human unfertilized oocytes after intracytoplasmic sperm injection (ICSI). Then, we cultured the resulting embryos to the blastocyst stage and screened them for chromosomal abnormalities, to assess the safety of this protocol. METHODS Aged human oocytes deemed unfertilized after ICSI were activated, either by briefly applying the calcium ionophore A23187 alone (group A) or by briefly applying the ionophore and then supplementing the culture medium with recombinant human GM-CSF (rhGM-CSF) (group B). Next, the development was monitored in a time-lapse incubator system, and ploidy was analyzed by array comparative genomic hybridization (aCGH), after whole embryo biopsy and whole genome amplification. Differences between oocytes and resulting embryos in both groups were evaluated statistically. RESULTS Oocytes unfertilized after ICSI can be activated with the calcium ionophore A23187 to show two pronuclei and two polar bodies. Addition of rhGM-CSF in the culture medium of A23187-activated oocytes enhances their cleaving and blastulation potential and results in more euploid blastocysts compared to the culture medium alone. CONCLUSIONS This study shows that activating post-ICSI aged human unfertilized oocytes with a combination of a calcium ionophore and a cytokine can produce good-morphology euploid blastocysts.
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Affiliation(s)
- Konstantinos A Economou
- Embryogenesis, Assisted Reproduction Unit, 49 Kifissias Avenue and Ziridi Street, 151 23 Maroussi, Athens, Greece.
| | - Dimitra Christopikou
- Embryogenesis, Assisted Reproduction Unit, 49 Kifissias Avenue and Ziridi Street, 151 23 Maroussi, Athens, Greece
| | - Erika Tsorva
- Embryogenesis, Assisted Reproduction Unit, 49 Kifissias Avenue and Ziridi Street, 151 23 Maroussi, Athens, Greece
| | - Stephen Davies
- Embryogenesis, Assisted Reproduction Unit, 49 Kifissias Avenue and Ziridi Street, 151 23 Maroussi, Athens, Greece
| | - Minas Mastrominas
- Embryogenesis, Assisted Reproduction Unit, 49 Kifissias Avenue and Ziridi Street, 151 23 Maroussi, Athens, Greece
| | - Haris Cazlaris
- Embryogenesis, Assisted Reproduction Unit, 49 Kifissias Avenue and Ziridi Street, 151 23 Maroussi, Athens, Greece
| | - Michael Koutsilieris
- Department of Physiology, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece
| | - Panagoula Angelogianni
- Department of Physiology, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece
| | - Dimitris Loutradis
- First Department of Obstetrics and Gynaecology, School of Medicine, Alexandra University Hospital, National and Kapodistrian University of Athens, Athens, Greece
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Rubino P, Viganò P, Luddi A, Piomboni P. The ICSI procedure from past to future: a systematic review of the more controversial aspects. Hum Reprod Update 2015; 22:194-227. [DOI: 10.1093/humupd/dmv050] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2015] [Accepted: 10/19/2015] [Indexed: 12/26/2022] Open
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Yeste M, Jones C, Amdani SN, Patel S, Coward K. Oocyte activation deficiency: a role for an oocyte contribution? Hum Reprod Update 2015; 22:23-47. [DOI: 10.1093/humupd/dmv040] [Citation(s) in RCA: 79] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2015] [Accepted: 08/13/2015] [Indexed: 12/11/2022] Open
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Abstract
SummaryThe aim of the present study was to determine the effects of increased dietary intake and high fat diet (HFD) in mice on artificial oocyte activation by using puromycin or roscovitine. Six-week-old mice were fed as either a control diet group, an increased dietary intake group or an HFD group for 4 weeks. Oocytes were obtained following superovulation and were divided into three treatment groups (no activation treatment, calcium ionophore and puromycin treatment, and calcium ionophore and roscovitine treatment) and were incubated for 4 h. Retrieved oocytes and numbers of oocytes activated as assessed by morphological changes were compared among the three treatment groups. The proportion of degenerated oocytes in HFD mice was significantly higher than that in control diet mice. The rates of activation in oocytes treated with roscovitine were 90.3% in control diet mice, 89.8% in increased dietary intake mice and 67.9% in HFD mice. The rate of activation in oocytes treated with roscovitine in HFD mice was significantly lower than the rates in control diet mice and increased dietary intake mice. The rates of activation in oocytes treated with puromycin were 90.6% in control diet mice, 94.0% in increased dietary intake mice and 71.4% in HFD mice, and the rate of activation in oocytes treated with puromycin in HFD mice was significantly lower than the rates in control diet mice and increased dietary intake mice. HFD-induced obesity deteriorated induction of oocyte activation by roscovitine or puromycin in mice.
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Premkumar KV, Chaube SK. Nitric oxide signals postovulatory aging-induced abortive spontaneous egg activation in rats. Redox Rep 2015; 20:184-92. [PMID: 25780809 DOI: 10.1179/1351000215y.0000000003] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
OBJECTIVE The aim of this study was to determine whether an increase of intracellular nitric oxide (NO) level signals postovulatory aging-induced abortive spontaneous egg activation (SEA) in rats. METHODS Freshly ovulated eggs (arrested at metaphase-II stage; M-II) were cultured in vitro for 3 hours to induce postovulatory egg aging. The morphological changes, inducible nitric oxide synthase (iNOS) expression, NO, cytosolic free Ca(2+), 3',5' cyclic guanosine monophosphate (cGMP), cell division cycle 25B (Cdc25B) and Wee1 levels, specific phosphorylation (pThr-14/Tyr-15) as well as total cyclin-dependent kinases-1 (Cdk1) (PSTAIRE) levels were analyzed. RESULTS Postovulatory aging induced generation of NO possibly through an iNOS-mediated pathway. The increase in NO level was associated with augmented cytosolic free Ca(2+) as well as cGMP levels in aged eggs. A significant increase in Wee1 level and decrease of Cdc25B level were observed in aged eggs. An accumulation of phosphorylated Cdk1 (pThr-14/Tyr-15) level was observed in aged eggs, while total Cdk1 (PSTAIR) level remained unchanged. CONCLUSION Our study demonstrates that generation of NO through an iNOS-mediated pathway increases cytosolic free Ca2+and cGMP levels. High levels of these signal molecules trigger the accumulation of phosphorylated Cdk1 in aged eggs. Thus, NO signals the accumulation of phosphorylated Cdk1 and induces postovulatory aging-induced abortive SEA in the rat.
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Fukuda Y, Akematsu T, Attiq R, Tada C, Nakai Y, Pearlman RE. Role of the Cytosolic Heat Shock Protein 70 Ssa5 in the Ciliate Protozoan Tetrahymena thermophila. J Eukaryot Microbiol 2015; 62:481-93. [DOI: 10.1111/jeu.12203] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2014] [Revised: 11/17/2014] [Accepted: 12/08/2014] [Indexed: 12/29/2022]
Affiliation(s)
- Yasuhiro Fukuda
- Department of Biodiversity Science; Division of Biological Resource Science; Graduate School of Agricultural Science; Tohoku University; Osaki Japan
| | | | - Rizwan Attiq
- Department of Biology; York University; Toronto Ontario Canada
| | - Chika Tada
- Department of Biodiversity Science; Division of Biological Resource Science; Graduate School of Agricultural Science; Tohoku University; Osaki Japan
| | - Yutaka Nakai
- Department of Biodiversity Science; Division of Biological Resource Science; Graduate School of Agricultural Science; Tohoku University; Osaki Japan
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Kim JW, Kim SD, Yang SH, Yoon SH, Jung JH, Lim JH. Successful pregnancy after SrCl2oocyte activation in couples with repeated low fertilization rates following calcium ionophore treatment. Syst Biol Reprod Med 2014; 60:177-82. [DOI: 10.3109/19396368.2014.900832] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Ya R, Downs SM. Suppression of chemically induced and spontaneous mouse oocyte activation by AMP-activated protein kinase. Biol Reprod 2013; 88:70. [PMID: 23390161 PMCID: PMC4013847 DOI: 10.1095/biolreprod.112.106120] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2012] [Revised: 12/04/2012] [Accepted: 02/04/2013] [Indexed: 12/26/2022] Open
Abstract
Oocyte activation is an important process triggered by fertilization that initiates embryonic development. However, parthenogenetic activation can occur either spontaneously or with chemical treatments. The LT/Sv mouse strain is genetically predisposed to spontaneous activation. LT oocytes have a cell cycle defect and are ovulated at the metaphase I stage instead of metaphase II. A thorough understanding of the female meiosis defects in this strain remains elusive. We have reported that AMP-activated protein kinase (PRKA) has an important role in stimulating meiotic resumption and promoting completion of meiosis I while suppressing premature parthenogenetic activation. Here we show that early activation of PRKA during the oocyte maturation period blocked chemically induced activation in B6SJL oocytes and spontaneous activation in LT/SvEiJ oocytes. This inhibitory effect was associated with high levels of MAPK1/3 activity. Furthermore, stimulation of PRKA partially rescued the meiotic defects of LT/Sv mouse oocytes in concert with correction of abnormal spindle pole localization of PRKA and loss of prolonged spindle assembly checkpoint activity. Altogether, these results confirm a role for PRKA in helping sustain the MII arrest in mature oocytes and suggest that dysfunctional PRKA contributes to meiotic defects in LT/SvEiJ oocytes.
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Affiliation(s)
| | - Stephen M. Downs
- Department of Biological Sciences, Marquette University, Milwaukee, Wisconsin
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Kamiyama H, Shimizu T, Oki T, Asada T, Araki Y, Araki Y. Successful delivery following intracytoplasmic sperm injection with calcium ionophore A23187 oocyte activation in a partially globozoospermic patient. Reprod Med Biol 2012; 11:159-164. [PMID: 29699121 PMCID: PMC5907117 DOI: 10.1007/s12522-012-0123-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2011] [Accepted: 02/28/2012] [Indexed: 10/28/2022] Open
Abstract
PURPOSE To describe a successful pregnancy outcome following intracytoplasmic sperm injection (ICSI) with assisted oocyte activation (AOA) in a case of partial globozoospermia. METHODS AOA was accomplished with calcium ionophore A23187. Sperm morphology was observed via light, fluorescent and electron microscopy following a Diff-Quik stain and fluorescein isothiocyanate-labeled peanut agglutinin (FITC-PNA) staining. An activation ability test was employed using a mouse oocyte exposed to strontium chloride. RESULTS Via light microscopy, it was found that a large number of sperm possessed deficient acrosomes and a sharply rounded head; however, we observed both normal and the aforementioned abnormal sperm via FITC-PNA staining of a semen specimen. Mouse oocyte activation was 87.5 % via natural activation without AOA. With AOA after ICSI, 100 % oocyte activation was observed. Five oocytes were retrieved, and AOA with A23187 after ICSI resulted in a high fertilization rate (4 of 5, 80 %). Two embryos developed and the patient subsequently delivered a healthy female infant without any congenital abnormalities. CONCLUSIONS We report a successful pregnancy outcome using an early stage embryo, which developed following ICSI using sperm from a partially globozoospermic patient who possessed temporary potential oocyte activation.
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Affiliation(s)
- Hiroshi Kamiyama
- Shiba Park Kamiyama ClinicDaiyu‐BL, 2‐9‐10 Shiba, Minato‐ku105‐0014TokyoJapan
| | - Taketoshi Shimizu
- Shiba Park Kamiyama ClinicDaiyu‐BL, 2‐9‐10 Shiba, Minato‐ku105‐0014TokyoJapan
| | - Tomomi Oki
- Shiba Park Kamiyama ClinicDaiyu‐BL, 2‐9‐10 Shiba, Minato‐ku105‐0014TokyoJapan
| | - Terumi Asada
- Shiba Park Kamiyama ClinicDaiyu‐BL, 2‐9‐10 Shiba, Minato‐ku105‐0014TokyoJapan
| | - Yasuyuki Araki
- The Institute for Advanced Reproductive Medical Technology909‐21 Ishii, Fujimi371‐0105MaebashiGunmaJapan
| | - Yasuhisa Araki
- The Institute for Advanced Reproductive Medical Technology909‐21 Ishii, Fujimi371‐0105MaebashiGunmaJapan
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Roscovitine in combination with calcium ionophore induces oocyte activation through reduction of M-phase promoting factor activity in mice. ZYGOTE 2011; 20:321-5. [DOI: 10.1017/s0967199411000591] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
SummaryThe aim of the present study was to determine oocyte activation and change in M-phase promoting factor (MPF) activity induced by treatment with calcium ionophore and roscovitine in comparison with those induced by treatment with roscovitine alone and treatment with calcium ionophore and puromycin in mice. Freshly ovulated oocytes obtained from 6–8-week-old mice were divided into five groups (no activation treatment; 5 μM calcium ionophore A23187; 50 μM roscovitine; 5 μM calcium ionophore and 10 μg/ml puromycin; and 5 μM calcium ionophore and 50 μM roscovitine) and were incubated for 6 h. Oocyte activation, assessed by morphological changes, and changes in MPF activity in the five groups at 0, 2, 4 and 6 h of incubation were examined. Activated oocytes were defined as oocytes with at least one pronucleus. Oocytes treated with roscovitine alone were not activated during the 6-h incubation period. All of the oocytes in the calcium ionophore with puromycin group and in the calcium ionophore with roscovitine group were activated. The percentage activity of MPF in oocytes treated with roscovitine alone was decreased after 2 h and increased after 4 h of incubation. The percentage activity of MPF in oocytes treated with calcium ionophore and roscovitine was significantly decreased with suppression of MPF activity being maintained for 6 h, and this change was similar to that in oocytes treated with calcium ionophore and puromycin. Roscovitine with calcium ionophore is effective for induction of oocyte activation through suppression of MPF activity in mice.
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Artificial oocyte activation and human failed-matured oocyte vitrification followed by in vitro maturation. ZYGOTE 2011; 21:71-6. [DOI: 10.1017/s0967199411000530] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
SummaryThe investigation presented in this paper was conducted on the effect of oocytes activation on frozen–thawed human immature oocytes followed by in vitro maturation (IVM). A total of 386 failed-matured oocytes (germinal vesicle (GV) and metaphase I (MI) stages) was randomly divided into two groups: fresh group and vitrification group, GV group and MI group, respectively). The matured oocytes were subject to intracytoplasmic sperm injection (ICSI) after IVM had been carried out. The vitrification group was randomly divided into two groups: controlled and artificial oocyte activation (AOA). The injected oocytes in the controlled group were cultured in cleavage medium. The AOA group oocytes were activated by exposing them to 7% anhydrous alcohol for 6 min then cultured in cleavage medium as well. The rates of fertilization and early embryonic development were compared between the controlled and AOA groups. In MI vitrification group, the high-quality embryo formation rate and blastocyst formation rate were significantly higher in the AOA group than in the controlled group (P < 0.01). In the GV vitrification group, the high-quality embryo formation rate was significantly higher in the AOA group than in the controlled group (P < 0.05). These results indicate that AOA may be good for early embryonic development of vitrified immature human oocytes.
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Stecher A, Bach M, Neyer A, Vanderzwalmen P, Zintz M, Zech NH. Case report: live birth following ICSI with non-vital frozen-thawed testicular sperm and oocyte activation with calcium ionophore. J Assist Reprod Genet 2011; 28:411-4. [PMID: 21424819 DOI: 10.1007/s10815-011-9546-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2010] [Accepted: 02/03/2011] [Indexed: 11/26/2022] Open
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RETRACTED: Failed fertilization after clinical intracytoplasmic sperm injection. Reprod Biomed Online 2010; 20:56-67. [DOI: 10.1016/j.rbmo.2009.10.010] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2009] [Revised: 05/06/2009] [Accepted: 09/10/2009] [Indexed: 11/24/2022]
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Morbeck DE, Walker DL, Fredrickson JR, Barud KM, Coddington CC. Parthenogenic activation of surplus in vitro–matured human oocytes: a tool for validation of oocyte cryopreservation. Fertil Steril 2009; 92:2091-3. [DOI: 10.1016/j.fertnstert.2009.05.084] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2009] [Revised: 05/14/2009] [Accepted: 05/27/2009] [Indexed: 11/16/2022]
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Abstract
SummaryObjective: To investigate the effects of various activation methods on freeze–thawed rabbit oocytes developmental potential. Methods: Rabbit oocytes were vitrified by cryoleafs and cryoprotected with ethylene glycol and propanediol. After thawing, the oocytes were fertilized by intracytoplasmic sperm injection (ICSI). Surviving oocytes after ICSI were divided into five groups at random. Group 1: Oocytes (n = 30) activated 1 h after ICSI by calcium ionomycin (I0634); Group 2: Oocytes (n = 26) activated by strontium chloride an hour after ICSI; Group 3: Oocytes (n = 33) activated by I0634 twice; Group 4: Oocytes (n = 28) were activated by strontium chloride twice; Control Group: Inactivated oocytes (n = 39). Blastocysts derived from each group were transplanted to recipient rabbits. Results: Rates of fertilization, cleavage and blastocyst formation of Group 3 were higher than those of Group 1 and Group 2 (81.8% vs 33.3% vs 53.8%, 54.5% vs 16.7% vs 26.9%, p < 0.05; 15.2% vs 3.3% vs 7.7%, p > 0.05). The rabbit transplanted with embryos derived from Group 3 became pregnant. Embryos derived from double activation could implant into endometrium. Conclusion: Double activation may increase freeze–thawed oocytes developmental potential. After activation, oocytes cleavage velocity may be faster than that of oocytes without activation.
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Nasr-Esfahani MH, Deemeh MR, Tavalaee M. Artificial oocyte activation and intracytoplasmic sperm injection. Fertil Steril 2009; 94:520-6. [PMID: 19393997 DOI: 10.1016/j.fertnstert.2009.03.061] [Citation(s) in RCA: 98] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2008] [Revised: 02/23/2009] [Accepted: 03/14/2009] [Indexed: 10/20/2022]
Abstract
OBJECTIVE To review different methods for artificial oocyte activation and its impact on intracytoplasmic sperm injection (ICSI). DESIGN Literature review. SETTING University-based and university-affiliated medical centers. PATIENT(S) None. INTERVENTION(S) None. MAIN OUTCOME MEASURE(S) None. RESULT(S) The ICSI procedure improves fertilization rates in cases of male factor infertility; however, fertilization failure still occurs in 2% to 3% of ICSI cycles. The main cause of failed fertilization is failure to complete oocyte activation. The investigators do not use a variety of mechanical, electrical, and chemical methods to mimic the calcium rise necessary to activate oocytes after ICSI. Chemical activation is the most commonly used method for artificial oocyte activation, resulting in high fertilization rates. CONCLUSION(S) Artificial oocyte activation (AOA) may be useful in selected patients who have low fertilization potential. Further studies are required to establish the biosafety of AOA, and clinical tests are needed to evaluate the activation potential of semen samples for proper patient selection.
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Mansour R, Fahmy I, Tawab NA, Kamal A, El-Demery Y, Aboulghar M, Serour G. Electrical activation of oocytes after intracytoplasmic sperm injection: a controlled randomized study. Fertil Steril 2009; 91:133-9. [DOI: 10.1016/j.fertnstert.2007.08.017] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2007] [Revised: 08/07/2007] [Accepted: 08/07/2007] [Indexed: 11/24/2022]
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Nasr-Esfahani MH, Razavi S, Javdan Z, Tavalaee M. Artificial oocyte activation in severe teratozoospermia undergoing intracytoplasmic sperm injection. Fertil Steril 2008; 90:2231-7. [DOI: 10.1016/j.fertnstert.2007.10.047] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2007] [Revised: 10/22/2007] [Accepted: 10/22/2007] [Indexed: 11/26/2022]
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Yanagida K, Fujikura Y, Katayose H. The present status of artificial oocyte activation in assisted reproductive technology. Reprod Med Biol 2008; 7:133-142. [PMID: 29699294 PMCID: PMC5907121 DOI: 10.1111/j.1447-0578.2008.00210.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
Intracytoplasmic sperm injection (ICSI) is the most effective treatment for achieving fertilization in assisted reproductive technology (ART). However, fertilization failure occurs. The incidence of fertilization failure after ICSI is 1-5%. Approximately 50% of fertilization failure cases could be attributed to the abnormality of sperm factor. As the fertilization fails after ICSI using mature sperm, round spermatids and globozoospermia, artificial oocyte activation may provide a means of improving fertilization rates in such cases. The oocyte activation treatments used in clinical research include calcium (Ca) ionophore treatment, electrostimulation and strontium treatment. In terms of the efficiency of oocyte activation, electrostimulation and Ca ionophore gave better outcomes than strontium treatment. Strontium treatment causes Ca2+ oscillations in mice, so it has been viewed favorably. However, in human oocytes calcium oscillation has not been observed. The fertilization rate after ICSI was low in the case of globozoospermia and wiht round spermatids. Some cases of pregnancy were achieved by ICSI alone and oocyte activation methods were not essential in these cases. Among the various oocyte activation methods currently used, it should be noted that issues of genetic safety have not been addressed for the combined use of these oocyte activation methods. (Reprod Med Biol 2008; 7: 133-142).
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Affiliation(s)
- Kaoru Yanagida
- Center for Infertility and IVF, International University of Health and Welfare Hospital, Nasushiobarashi, Tochigi, Japan
| | - Yoko Fujikura
- Center for Infertility and IVF, International University of Health and Welfare Hospital, Nasushiobarashi, Tochigi, Japan
| | - Haruo Katayose
- Center for Infertility and IVF, International University of Health and Welfare Hospital, Nasushiobarashi, Tochigi, Japan
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McElroy SL, Kee K, Tran N, Menses J, Giudice LC, Reijo Pera RA. Developmental competence of immature and failed/abnormally fertilized human oocytes in nuclear transfer. Reprod Biomed Online 2008; 16:684-93. [PMID: 18492373 DOI: 10.1016/s1472-6483(10)60483-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Somatic cell nuclear transfer holds great promise for basic studies of reprogramming human somatic cells and for the potential development of novel cell-based therapeutics. The aim of this study was to examine experimental aspects of human nuclear transfer via use of an abundant source of oocytes, those that are routinely discarded from assisted reproduction clinics. The results suggest and reinforce several findings based on the analysis of multiple parameters: first, it was observed that supplementation of commercial culture media with hormones promoted embryo development after parthenogenetic activation. Second, the use of the chemical activation reagent puromycin resulted in significant differences in cleavage rates in oocytes that were failed/abnormally fertilized after intracytoplasmic sperm injection relative to those from IVF (P < 0.05). Third, cycloheximide promoted cleavage rates >/=40% in both groups of oocytes; moreover, two blastocysts were produced following cycloheximide treatment. Finally, the use of a subset of oocytes for nuclear transfer resulted in cleaved embryos that expressed green fluorescent protein from a transgene in donor nuclei from human embryonic stem cells. In light of these results, it is suggested that the discarded oocytes can be used to investigate new human nuclear transfer protocols for embryonic stem cell derivation.
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Affiliation(s)
- Sohyun Lee McElroy
- Institute for Stem Cell Biology and Regenerative Medicine, Department of Obstetrics and Gynecology, Stanford University School of Medicine, Stanford, Palo Alto, CA 94304-5542, USA
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Yanagida K, Morozumi K, Katayose H, Hayashi S, Sato A. Successful pregnancy after ICSI with strontium oocyte activation in low rates of fertilization. Reprod Biomed Online 2006; 13:801-6. [PMID: 17169199 DOI: 10.1016/s1472-6483(10)61027-9] [Citation(s) in RCA: 69] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Fertilization failure (complete fertilization failure or low fertilization rates) after intracytoplasmic sperm injection (ICSI) can occur in rare cases. In the majority of these cases, the unfertilized oocytes are inactivated. Assisted oocyte activation was applied as a treatment option for a case of low fertilization rate as a clinical trial. A patient with a low fertilization rate (ranging from 0% to 33.3%; mean = 17.0%) after eight previous ICSI cycles at another hospital, was diagnosed with fertilization failure. The most likely cause of fertilization failure was failure of oocyte activation. Therefore, artificial oocyte activation by strontium treatment was combined with ICSI to achieve viable fertilized oocytes. Oocytes were stimulated with strontium (10 mM SrCl(2), 60 min) approximately 30 min after ICSl. Six injected oocytes were stimulated and all were then successfully fertilized. Two blastocysts were transferred into the uterus, resulting in a pregnancy and birth. A second pregnancy was achieved following implantation of two cryopreserved embryos (one blastocyst and one morula). In conclusion, strontium treatment was found to be an effective method for artificial oocyte activation in a case with a low fertilization rate after ICSI.
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Affiliation(s)
- K Yanagida
- Centre for Infertility IVF International University Of Health and Welfare Hospital, International University of Health and Welfare, Tochigi, Japan.
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