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Wen X, Yang Q, Sun D, Jiang ZY, Wang T, Liu HR, Han Z, Wang L, Liang CG. Cumulus Cells Accelerate Postovulatory Oocyte Aging through IL1-IL1R1 Interaction in Mice. Int J Mol Sci 2023; 24:ijms24043530. [PMID: 36834943 PMCID: PMC9959314 DOI: 10.3390/ijms24043530] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2022] [Revised: 02/05/2023] [Accepted: 02/07/2023] [Indexed: 02/12/2023] Open
Abstract
The oocytes of female mammals will undergo aging after ovulation, also known as postovulatory oocyte aging (POA). Until now, the mechanisms of POA have not been fully understood. Although studies have shown that cumulus cells accelerate POA over time, the exact relationship between the two is still unclear. In the study, by employing the methods of mouse cumulus cells and oocytes transcriptome sequencing and experimental verification, we revealed the unique characteristics of cumulus cells and oocytes through ligand-receptor interactions. The results indicate that cumulus cells activated NF-κB signaling in oocytes through the IL1-IL1R1 interaction. Furthermore, it promoted mitochondrial dysfunction, excessive ROS accumulation, and increased early apoptosis, ultimately leading to a decline in the oocyte quality and the appearance of POA. Our results indicate that cumulus cells have a role in accelerating POA, and this result lays a foundation for an in-depth understanding of the molecular mechanism of POA. Moreover, it provides clues for exploring the relationship between cumulus cells and oocytes.
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2
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Shimoi G, Wakabayashi R, Ishikawa R, Kameyama Y. Effects of post-ovulatory aging on centromeric cohesin protection in murine MII oocytes. Reprod Med Biol 2022; 21:RMB212433. [PMID: 35386382 PMCID: PMC8967304 DOI: 10.1002/rmb2.12433] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2021] [Revised: 10/30/2021] [Accepted: 11/23/2021] [Indexed: 11/09/2022] Open
Abstract
Purpose Post-ovulatory aging causes a high frequency of aneuploidy during meiosis II in mouse oocytes, irrespective of maternal age. In this study, we evaluated the effects of post-ovulatory oocyte aging on the protection of chromosomal cohesion involved in aneuploidy and verified the relationship between PP2A or SGO2 expression and the phosphorylation level of REC8 in oocytes. Methods Murine ovulated oocytes were incubated for 6 or 12 h in vitro after collection and denoted as the aged group. The oocytes examined immediately after collection were used as the control group. Immunofluorescent staining was used to detect the localization of PP2A, SGO2, BUB1, AURORA B, and MAD2 in the chromosomal centromere. Immunoblotting was used to quantify the expression of proteins describe above and REC8 in the oocytes. Results PP2A expression involved in the de-phosphorylation of REC8 decreased over time in oocytes, suggesting a deficiency in PP2A in centromeres. This indicated an increase in the level of phosphorylated REC8, which destabilizes centromeric cohesion in oocytes. In contrast, SGO2 expression was significantly high in aged oocytes. Conclusions The findings show that post-ovulatory aging destabilizes the centromeric cohesin protection in oocytes and can cause aneuploidy, which is often observed in aged oocytes during meiosis II.
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Affiliation(s)
- Gaku Shimoi
- Faculty of BioindustryTokyo University of AgricultureAbashiriJapan
- Graduate School of BioindustryTokyo University of AgricultureAbashiriJapan
| | - Rico Wakabayashi
- Faculty of BioindustryTokyo University of AgricultureAbashiriJapan
| | - Ryu Ishikawa
- Graduate School of BioindustryTokyo University of AgricultureAbashiriJapan
| | - Yuichi Kameyama
- Faculty of BioindustryTokyo University of AgricultureAbashiriJapan
- Graduate School of BioindustryTokyo University of AgricultureAbashiriJapan
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3
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Xing X, Zhang J, Zhang J, Wang Y, Wang J, Kang J, Quan F, Su J, Zhang Y. Coenzyme Q10 supplement rescues postovulatory oocyte aging by regulating SIRT4 expression. Curr Mol Pharmacol 2021; 15:190-203. [PMID: 33881976 DOI: 10.2174/1874467214666210420112819] [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: 08/15/2020] [Revised: 03/18/2021] [Accepted: 03/22/2021] [Indexed: 11/22/2022]
Abstract
BACKGROUND High-quality of the oocyte is crucial for embryo development and the success of human assisted reproduction. The postovulatory aged oocytes lose the developmental competence with mitochondrial dysfunction and oxidative stress. Coenzyme Q10 (CoQ10) is widely distributed in the membranes of cells, and has an important role in the mitochondrial respiration chain, against oxidative stress and modulation of gene expression. OBJECTIVE To investigate the functions and mechanisms of CoQ10 on delaying postovulatory oocyte aging. METHODS Quantitative real-time PCR and Immunofluorescence staining were used to determine the expression patterns of the biogenesis genes of CoQ10 in postovulatory aged oocytes compared with fresh oocytes. The mitochondrial function, apoptosis, reactive oxygen species (ROS) accumulation and spindle abnormalities were investigated after treatment with 10 μM CoQ10 in aged groups. SIRT4 siRNA or capped RNA was injected into oocytes to investigate the function of SIRT4 on postovulatory oocyte aging and the relationship between CoQ10 and SIRT4. RESULTS Multiple CoQ10 biosynthesis enzymes are insufficient, and supplement of CoQ10 can improve oocyte quality and elevate the development competency of postovulatory aged oocytes. CoQ10 can attenuate the aging-induced abnormalities including mitochondrial dysfunction, ROS accumulation, spindle abnormalities, and apoptosis in postovulatory aged oocytes. Furthermore, SIRT4, which was first found to be up-regulated in postovulatory aged oocytes, decreased following CoQ10 treatment. Finally, knockdown of SIRT4 can rescue aging-induced dysfunction of mitochondria, and the efficiency of CoQ10 rescuing dysfunction of mitochondria can be weakened by SIRT4 overexpression. CONCLUSION Supplement of CoQ10 protects oocytes from postovulatory aging by inhibiting SIRT4increase.
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Affiliation(s)
- Xupeng Xing
- College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Jinjing Zhang
- College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Jingcheng Zhang
- College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Yongsheng Wang
- College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Jingyi Wang
- College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Jian Kang
- College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Fusheng Quan
- College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Jianmin Su
- College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Yong Zhang
- College of Veterinary Medicine, Northwest A&F University, Yangling, Shaanxi 712100, China
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4
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Marine Nemertean Worms for Immunoblotting Studies of Oocyte Aging. Methods Mol Biol 2021. [PMID: 33074538 DOI: 10.1007/978-1-0716-0974-3_8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
Abstract
Immunoblotting analyses employing phospho-specific antibodies can help elucidate potential roles played by protein kinases as oocytes age and lose their ability to undergo normal fertilization. This chapter updates a previously published protocol for conducting immunoblotting analyses of oocyte maturation in marine nemertean worms by adding general methods for obtaining adult worms and for handling their gametes in experiments assessing oocyte aging.
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5
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Kitasaka H, Tokoro M, Kojima M, Fukunaga N, Asada Y. Gonadotropin levels at the start of ovarian stimulation predict normal fertilization after hCG re-trigger in GnRH antagonist cycles. Reprod Med Biol 2021; 20:96-107. [PMID: 33488289 PMCID: PMC7812458 DOI: 10.1002/rmb2.12359] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2020] [Revised: 09/30/2020] [Accepted: 11/16/2020] [Indexed: 11/21/2022] Open
Abstract
PURPOSE To assess the appropriateness of human chorionic gonadotropin (hCG) re-trigger in poor responders to gonadotropin-releasing hormone agonist (GnRHa) trigger in controlled ovarian stimulation (COS) cycles. METHODS The 2251 cycles in 2251 patients triggered with GnRHa for oocyte stimulation, with or without requiring hCG re-trigger between 2013 and 2018, were retrospectively analyzed to compare gonadotropin levels at the start of COS and the rate of normal fertilization between the re-trigger and non-re-trigger group. Furthermore, patients in the re-trigger group were stratified by the rate of normal fertilization (good: ≥60% or poor: <60%) to compare patient demographics, hormone profiles, and clinical outcome between the subgroups. RESULTS In the re-trigger group, FSH and LH levels at the start of COS were significantly lower in the good fertilization group than in the poor fertilization group (P < .01). Receiver operating characteristic curves identified cutoff values of the FSH and LH levels of 1.30 and 0.35 mIU/mL, respectively, for predicting ≥60% normal fertilization. CONCLUSION Gonadotropin levels at the start of COS are predictors of response to GnRHa trigger and hCG re-trigger necessity, and may serve as indicators to help clinicians appropriately choose hCG re-trigger rather than abandoning the cycles or continuing the first oocyte aspiration attempt.
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Affiliation(s)
| | - Mikiko Tokoro
- Asada Ladies ClinicNagoyaJapan
- Asada Institute for Reproductive MedicineKasugaiJapan
| | | | - Noritaka Fukunaga
- Asada Ladies ClinicNagoyaJapan
- Asada Institute for Reproductive MedicineKasugaiJapan
| | - Yoshimasa Asada
- Asada Ladies ClinicNagoyaJapan
- Asada Institute for Reproductive MedicineKasugaiJapan
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6
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Kim G, Roy PK, Fang X, Hassan BM, Cho J. Improved preimplantation development of porcine somatic cell nuclear transfer embryos by caffeine treatment. J Vet Sci 2019; 20:e31. [PMID: 31161749 PMCID: PMC6538509 DOI: 10.4142/jvs.2019.20.e31] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2018] [Revised: 01/04/2019] [Accepted: 05/07/2019] [Indexed: 11/20/2022] Open
Abstract
This study examined the effects of a caffeine treatment to improve nuclear reprogramming in porcine cloned embryos. Embryonic development and the expression of genes related to pluripotency (POU5F1, SOX2, NANOG, and CDX2) were compared after caffeine supplementation during manipulation at different concentrations (0, 1.25, 2.5, and 5.0 mM) and after varying the delayed activation time (control, 1, 2, and 4 h) after fusion. Caffeine added to media during manipulation produced a higher rate of development to blastocysts in the 1.25 mM group than in the other concentration groups (22.8% vs. 16.1%, 16.2%, and 19.2%; p < 0.05). When caffeine was added during the 4 h delayed activation, the 1.25 mM caffeine concentration produced a significantly higher rate of development than those in the other 4 h-activation-delayed caffeine concentration groups (22.4% vs. 9.4%, 14.0%, and 11.1%; p < 0.05). On the other hand, no significant improvement over that in the control group was observed when caffeine was supplemented during both the manipulation period and delayed activation period (16.0% vs. 15.2%), respectively. The levels of POU5F1, SOX2, and NANOG expression in blastocysts were significantly higher in the delayed activation caffeine group (4 h, 1.25 mM) than in the control group (1 h, 0 mM; p < 0.05). In conclusion, a caffeine treatment at 1.25 mM during delayed activation for 4 h can improve the preimplantation development of porcine somatic cell nuclear transfer embryos by activating nuclear reprogramming.
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Affiliation(s)
- Ghangyong Kim
- College of Veterinary Medicine, Chungnam National University, Daejeon 34134, Korea.,Xenotransplantation Research Center, College of Medicine, Seoul National University, Seoul 03080, Korea
| | - Pantu Kumar Roy
- College of Veterinary Medicine, Chungnam National University, Daejeon 34134, Korea
| | - Xun Fang
- College of Veterinary Medicine, Chungnam National University, Daejeon 34134, Korea
| | - Bahia Ms Hassan
- College of Veterinary Medicine, Chungnam National University, Daejeon 34134, Korea
| | - Jongki Cho
- College of Veterinary Medicine, Chungnam National University, Daejeon 34134, Korea.
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7
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Shimoi G, Tomita M, Kataoka M, Kameyama Y. Destabilization of spindle assembly checkpoint causes aneuploidy during meiosis II in murine post-ovulatory aged oocytes. J Reprod Dev 2019; 65:57-66. [PMID: 30464155 PMCID: PMC6379765 DOI: 10.1262/jrd.2018-056] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Accepted: 11/02/2018] [Indexed: 11/20/2022] Open
Abstract
Mammalian oocyte quality degrades over time after ovulation in vitro, which can cause fatal defects such as chromosomal aneuploidy. As various oocyte manipulations employed in assisted reproductive technology are time consuming, post-ovulatory aging is a serious problem to overcome in reproductive medicine or ova research. In this study, we investigated the effects of postovulatory aging on the incidence of chromosome aneuploidy during meiosis II, with a focus on the expression of functional proteins from the spindle assembly checkpoint (SAC). Chromosome analysis was used to assess the rate of aneuploidy in in vitro aged oocytes, or in early embryos derived from aged oocytes. Immunofluorescent staining was used to detect the localization of MAD2, which is a SAC signal that monitors the correct segregation of sister chromatids. Immunoblotting was used to quantify cohesin subunits, which are adhesion factors connecting sister chromatids at the metaphase II (MII) centromere. It was shown that post-ovulatory oocyte aging inhibits MAD2 localization to the sister kinetochore. Furthermore, oocyte aging prevented cohesin subunits from being maintained or degraded at the appropriate time. These data suggest that the destabilization of SAC signaling causes sister chromatid segregation errors in MII oocytes, and consequently increases the incidence of aneuploidy in early embryos. Our findings have provided distinct evidence that the post-ovulatory aging of oocytes might also be a risk factor for aneuploidy, irrespective of maternal age.
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Affiliation(s)
- Gaku Shimoi
- Laboratory of Animal Resources and Development, Department of Northern Biosphere Agriculture, Faculty of Bioindustry, Tokyo University of Agriculture, Hokkaido 099-2493, Japan
| | - Masaru Tomita
- Laboratory of Animal Resources and Development, Department of Northern Biosphere Agriculture, Faculty of Bioindustry, Tokyo University of Agriculture, Hokkaido 099-2493, Japan
| | - Marino Kataoka
- Laboratory of Animal Resources and Development, Department of Northern Biosphere Agriculture, Faculty of Bioindustry, Tokyo University of Agriculture, Hokkaido 099-2493, Japan
| | - Yuichi Kameyama
- Laboratory of Animal Resources and Development, Department of Northern Biosphere Agriculture, Faculty of Bioindustry, Tokyo University of Agriculture, Hokkaido 099-2493, Japan
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8
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Melatonin prevents postovulatory oocyte aging and promotes subsequent embryonic development in the pig. Aging (Albany NY) 2018; 9:1552-1564. [PMID: 28657543 PMCID: PMC5509455 DOI: 10.18632/aging.101252] [Citation(s) in RCA: 67] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2017] [Accepted: 06/15/2017] [Indexed: 12/22/2022]
Abstract
Oxidative stress is known as a major contributing factor involved in oocyte aging, which negatively affects oocyte quality and development after fertilization. Melatonin is an effective free radical scavenger and its metabolites AFMK and AMK are powerful detoxifiers that eliminate free radicals. In this study, we used porcine oocytes to test the hypothesis that melatonin could scavenge free radicals produced during oocyte aging, thereby maintaining oocyte quality. We compared reactive oxygen species levels, apoptosis levels, mitochondrial membrane potential ratios, total glutathione contents and expression levels in fresh, aged and melatonin-treated aged porcine oocytes and observed the percentage of blastocyst formation following parthenogenetic activation. We found that melatonin could effectively maintain the morphology of oocytes observed in control oocytes, alleviate oxidative stress, markedly decrease early apoptosis levels, retard the decline of mitochondrial membrane potential and significantly promote subsequent embryonic development in oocytes aged for 24 hr in vitro. These results strongly suggest that melatonin can prevent postovulatory oocyte aging and promote subsequent embryonic development in the pig, which might find practical applications to control oocyte aging in other mammalian species including humans to maintain the quality of human oocytes when performing clinical assisted reproductive technology.
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9
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Baek JI, Seol DW, Lee AR, Lee WS, Yoon SY, Lee DR. Maintained MPF Level after Oocyte Vitrification Improves Embryonic Development after IVF, but not after Somatic Cell Nuclear Transfer. Mol Cells 2017; 40:871-879. [PMID: 29145719 PMCID: PMC5712517 DOI: 10.14348/molcells.2017.0184] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2017] [Revised: 09/28/2017] [Accepted: 10/13/2017] [Indexed: 12/23/2022] Open
Abstract
Levels of maturation-promoting factor (MPF) in oocytes decline after vitrification, and this decline has been suggested as one of the main causes of low developmental competence resulting from cryoinjury. Here, we evaluated MPF activity in vitrified mouse eggs following treatment with caffeine, a known stimulator of MPF activity, and/or the proteasome inhibitor MG132. Collected MII oocytes were vitrified and divided into four groups: untreated, 10 mM caffeine (CA), 10 μM MG132 (MG), and 10 mM caffeine +10 μM MG132 (CA+MG). After warming, the MPF activity of oocytes and their blastocyst formation and implantation rates in the CA, MG, and CA+MG groups were much higher than those in the untreated group. However, the cell numbers in blastocysts did not differ among groups. Analysis of the effectiveness of caffeine and MG132 for improving somatic cell nuclear transfer (SCNT) technology using cryopreserved eggs showed that supplementation did not improve the blastocyst formation rate of cloned mouse eggs. These results suggest that maintaining MPF activity after cryopreservation may have a positive effect on further embryonic development, but is unable to fully overcome cryoinjury. Thus, intrinsic factors governing the developmental potential that diminish during oocyte cryopreservation should be explored.
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Affiliation(s)
- Ji I Baek
- Department of Biomedical Science, College of Life Science, CHA University, Seongnam 13488,
Korea
| | - Dong-Won Seol
- Department of Biomedical Science, College of Life Science, CHA University, Seongnam 13488,
Korea
| | - Ah-Reum Lee
- Department of Biomedical Science, College of Life Science, CHA University, Seongnam 13488,
Korea
| | - Woo Sik Lee
- Fertility Center of CHA Gangnam Medical Center, College of Medicine, CHA University, Seoul 06135,
Korea
| | - Sook-Young Yoon
- Department of Biomedical Science, College of Life Science, CHA University, Seongnam 13488,
Korea
- Fertility Center of CHA Gangnam Medical Center, College of Medicine, CHA University, Seoul 06135,
Korea
| | - Dong Ryul Lee
- Department of Biomedical Science, College of Life Science, CHA University, Seongnam 13488,
Korea
- Fertility Center of CHA Gangnam Medical Center, College of Medicine, CHA University, Seoul 06135,
Korea
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10
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Kanda A, Nobukiyo A, Yoshioka M, Hatakeyama T, Sotomaru Y. Quality of common marmoset (Callithrix jacchus) oocytes collected after ovarian stimulation. Theriogenology 2017; 106:221-226. [PMID: 29096269 DOI: 10.1016/j.theriogenology.2017.10.023] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2017] [Revised: 10/13/2017] [Accepted: 10/15/2017] [Indexed: 10/18/2022]
Abstract
The common marmoset (Callithrix jacchus) is an experimental animal that is considered suitable for the creation of next-generation human disease models. It has recently been used in the reproductive technology field. Oocytes can be effectively collected from female marmosets via ovarian stimulation with injections of follicle-stimulating hormone (FSH) and human chorionic gonadotropin (hCG). The oocytes, collected about 28 h after the hCG injection, include both premature oocytes and postmature (in vivo matured; IVO) oocytes, and the premature oocytes can be matured by in vitro culture (in vitro matured; IVM). Although IVM and IVO oocytes are equivalent in appearance at the MII stage, it remains unclear whether there are differences in their properties. Therefore, we investigated their in vitro fertilization and developmental capacities and cytoskeletal statuses. Our findings revealed that the IVM and IVO oocytes had similar fertilization rates but that no IVO oocytes could develop to the blastocyst stage. Additionally, IVO oocytes showed abnormal cytoskeletal formation. It is concluded that IVM oocytes maintain normal function, whereas IVO oocytes would be affected by aging and other factors when they remain for a long time in the ovary.
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Affiliation(s)
- Akifumi Kanda
- Natural Science Center for Basic Research and Development, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8551, Japan
| | - Asako Nobukiyo
- Natural Science Center for Basic Research and Development, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8551, Japan
| | - Miyuki Yoshioka
- Natural Science Center for Basic Research and Development, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8551, Japan
| | - Teruhiko Hatakeyama
- Natural Science Center for Basic Research and Development, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8551, Japan
| | - Yusuke Sotomaru
- Natural Science Center for Basic Research and Development, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8551, Japan.
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11
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The potential roles of c-Jun N-terminal kinase (JNK) during the maturation and aging of oocytes produced by a marine protostome worm. ZYGOTE 2017; 25:686-696. [PMID: 29032774 DOI: 10.1017/s0967199417000533] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Previous investigations have indicated that c-Jun N-terminal kinase (JNK) regulates the maturation and aging of oocytes produced by deuterostome animals. In order to assess the roles of this kinase in a protostome, oocytes of the marine nemertean worm Cerebratulus were stimulated to mature and subsequently aged before being probed with phospho-specific antibodies against active forms of JNK and maturation-promoting factor (MPF). Based on blots of maturing oocytes, a 40-kD putative JNK is normally activated during germinal vesicle breakdown (GVBD), which begins at 30 min post-stimulation with seawater, whereas treating immature oocytes with JNK inhibitors downregulates both the 40-kD JNK signal and GVBD, collectively suggesting a 40-kD JNK may facilitate oocyte maturation. Along with this JNK activity, mature oocytes also exhibit high levels of MPF at 2 h post-stimulation. However, by ~6-8 h post-GVBD, mature oocytes lose the 40-kD JNK signal, and at ~20-30 h of aging, an ~48-kD phospho-JNK band arises as oocytes deactivate MPF and begin to lyse during a necroptotic-like mode of death. Accordingly, JNK inhibitors reduce the aging-related 48-kD JNK phosphorylation while maintaining MPF activity and retarding oocyte degradation. Such findings suggest that a 48-kD JNK may help deactivate MPF and trigger death. Possible mechanisms by which JNK activation either together with, or independently of, protein neosynthesis might stimulate oocyte degradation are discussed.
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12
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Zhang X, Liu X, Chen L, Wu DY, Nie ZW, Gao YY, Miao YL. Caffeine delays oocyte aging and maintains the quality of aged oocytes safely in mouse. Oncotarget 2017; 8:20602-20611. [PMID: 28206974 PMCID: PMC5400529 DOI: 10.18632/oncotarget.15292] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2016] [Accepted: 01/11/2017] [Indexed: 12/04/2022] Open
Abstract
Caffeine, as an oocyte aging inhibitor, was used in many different species to control or delay oocyte aging. However, the safety of caffeine and developmental competence of aged oocytes inhibited by caffeine has not been studied systematically. So we detected the spindle morphology, distribution of cortical granules, zona pellucida hardening and pronucleus formation to assess oocyte quality of caffeine treated oocytes. We found that aged oocytes treated by caffeine maintained weak susceptibility to activating stimuli and regained normal competent after aged further 6 hr. Caffeine maintained the spindle morphology, changed cortical granules distribution of aged oocytes and could not prevent zona pellucida hardening. Furthermore, caffeine increased pronucleus formation of aged oocytes and decreased fragmentation after fertilization. These results suggested that caffeine could maintain the quality of aged oocytes safely in mouse.
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Affiliation(s)
- Xia Zhang
- Institute of Stem Cell and Regenerative Biology, College of Animal Science and Veterinary Medicine, Huazhong Agricultural University, Wuhan, China.,The Cooperative Innovation Center for Sustainable Pig Production, Wuhan, China
| | - Xiaoyan Liu
- Institute of Stem Cell and Regenerative Biology, College of Animal Science and Veterinary Medicine, Huazhong Agricultural University, Wuhan, China.,Key Lab of Agricultural Animal Genetics, Breeding, and Reproduction of Ministry of Education, Huazhong Agricultural University, Wuhan, China.,Reproductive Medicine Centre, Affiliated Hospital of Qingdao Medical University, Yuhuangding Hospital of Yantai, Yantai, Shandong, China
| | - Li Chen
- Institute of Stem Cell and Regenerative Biology, College of Animal Science and Veterinary Medicine, Huazhong Agricultural University, Wuhan, China.,Key Lab of Agricultural Animal Genetics, Breeding, and Reproduction of Ministry of Education, Huazhong Agricultural University, Wuhan, China
| | - Dan-Ya Wu
- Institute of Stem Cell and Regenerative Biology, College of Animal Science and Veterinary Medicine, Huazhong Agricultural University, Wuhan, China.,Key Lab of Agricultural Animal Genetics, Breeding, and Reproduction of Ministry of Education, Huazhong Agricultural University, Wuhan, China
| | - Zheng-Wen Nie
- Institute of Stem Cell and Regenerative Biology, College of Animal Science and Veterinary Medicine, Huazhong Agricultural University, Wuhan, China.,Key Lab of Agricultural Animal Genetics, Breeding, and Reproduction of Ministry of Education, Huazhong Agricultural University, Wuhan, China
| | - Ying-Ying Gao
- Institute of Stem Cell and Regenerative Biology, College of Animal Science and Veterinary Medicine, Huazhong Agricultural University, Wuhan, China.,Key Lab of Agricultural Animal Genetics, Breeding, and Reproduction of Ministry of Education, Huazhong Agricultural University, Wuhan, China
| | - Yi-Liang Miao
- Institute of Stem Cell and Regenerative Biology, College of Animal Science and Veterinary Medicine, Huazhong Agricultural University, Wuhan, China.,Key Lab of Agricultural Animal Genetics, Breeding, and Reproduction of Ministry of Education, Huazhong Agricultural University, Wuhan, China.,The Cooperative Innovation Center for Sustainable Pig Production, Wuhan, China
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13
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Wakayama S, Tanabe Y, Nagatomo H, Mizutani E, Kishigami S, Wakayama T. Effect of Long-Term Exposure of Donor Nuclei to the Oocyte Cytoplasm on Production of Cloned Mice Using Serial Nuclear Transfer. Cell Reprogram 2016; 18:382-389. [PMID: 27622855 DOI: 10.1089/cell.2016.0026] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Although animal cloning is becoming increasingly practicable, cloned embryos possess many abnormalities and so there has been a low success rate for producing live animals. This is most likely due to incomplete reprogramming of somatic cell nuclei before they start to develop as the donor nuclei are usually only exposed to the oocyte cytoplasm for 1-2 hours before reconstructed oocytes are activated to avoid oocyte aging. Therefore, in this study, we attempted to extend the exposure period of somatic cell nuclei to the oocyte cytoplasm to determine whether this could enhance reprogramming of donor nuclei. Donor nuclei were transferred into oocytes, following which pseudo-MII spindles (pMIIs) derived from these were extracted and injected into newly collected enucleated oocytes 24 hours after the first nuclear transfer (NT). These serial NT oocytes were then activated and their developmental potential was examined to full term. There was no obvious difference in the pMIIs of reconstructed oocytes at 6 and 24 hours after donor nucleus injection; however, in both of these, the chromosomes were more widely spread inside the spindle than in fresh intact oocytes. Furthermore, a few chromosomes remained in 25% and 47% of these enucleated oocytes at 6 and 24 hours after donor nucleus injection, respectively. When these pMIIs were injected into fresh enucleated oocytes, the developmental rate to blastocyst was significantly lower, but we could still obtain several healthy cloned offspring. Thus, serial NT at intervals of 24 hours using fresh oocytes is possible, but the success rate could not be improved due to loss of chromosomes during the second NT.
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Affiliation(s)
- Sayaka Wakayama
- 1 Advanced Biotechnology Center, University of Yamanashi , Kofu-shi, Yamanashi, Japan
| | - Yoshiaki Tanabe
- 2 Faculty of Life and Environmental Sciences, University of Yamanashi , Kofu-shi, Yamanashi, Japan
| | - Hiroaki Nagatomo
- 3 COC Promotion Center, University of Yamanashi , Kofu-shi, Yamanashi, Japan
| | - Eiji Mizutani
- 1 Advanced Biotechnology Center, University of Yamanashi , Kofu-shi, Yamanashi, Japan .,2 Faculty of Life and Environmental Sciences, University of Yamanashi , Kofu-shi, Yamanashi, Japan
| | - Satoshi Kishigami
- 2 Faculty of Life and Environmental Sciences, University of Yamanashi , Kofu-shi, Yamanashi, Japan
| | - Teruhiko Wakayama
- 1 Advanced Biotechnology Center, University of Yamanashi , Kofu-shi, Yamanashi, Japan .,2 Faculty of Life and Environmental Sciences, University of Yamanashi , Kofu-shi, Yamanashi, Japan
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Bernal-Ulloa SM, Lucas-Hahn A, Herrmann D, Hadeler KG, Aldag P, Baulain U, Niemann H. Oocyte pre-IVM with caffeine improves bovine embryo survival after vitrification. Theriogenology 2016; 86:1222-30. [DOI: 10.1016/j.theriogenology.2016.04.013] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2016] [Revised: 04/07/2016] [Accepted: 04/09/2016] [Indexed: 12/30/2022]
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Zheng J, Yin XQ, Ge W, He GF, Qian WP, Ma JY, Shen W, Yin S, Sun QY. Post-ovulatory aging of mouse oocytesin vivoandin vitro: Effects of caffeine on exocytosis and translocation of cortical granules. Anim Sci J 2016; 87:1340-1346. [DOI: 10.1111/asj.12611] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2015] [Revised: 12/28/2015] [Accepted: 01/08/2016] [Indexed: 01/09/2023]
Affiliation(s)
- Jie Zheng
- Key Laboratory of Animal Reproduction and Germplasm Enhancement in Universities of Shandong, College of Animal Science and Technology; Qingdao Agricultural University; Qingdao Shandong China
- Institute of Reproductive Sciences; Qingdao Agricultural University; Qingdao China
| | - Xun-Qiang Yin
- Key Laboratory of Animal Reproduction and Germplasm Enhancement in Universities of Shandong, College of Animal Science and Technology; Qingdao Agricultural University; Qingdao Shandong China
- Institute of Reproductive Sciences; Qingdao Agricultural University; Qingdao China
| | - Wei Ge
- Key Laboratory of Animal Reproduction and Germplasm Enhancement in Universities of Shandong, College of Animal Science and Technology; Qingdao Agricultural University; Qingdao Shandong China
- Institute of Reproductive Sciences; Qingdao Agricultural University; Qingdao China
| | - Gui-Fang He
- College of Life Science; Qingdao Agricultural University; Qingdao China
- Institute of Reproductive Sciences; Qingdao Agricultural University; Qingdao China
| | - Wei-Ping Qian
- Department of Reproductive Medicine; Peking University Shenzhen Hospital; Medical Center of Peking University; Shenzhen Guangdong China
| | - Jun-Yu Ma
- Key Laboratory of Animal Reproduction and Germplasm Enhancement in Universities of Shandong, College of Animal Science and Technology; Qingdao Agricultural University; Qingdao Shandong China
- Institute of Reproductive Sciences; Qingdao Agricultural University; Qingdao China
| | - Wei Shen
- Key Laboratory of Animal Reproduction and Germplasm Enhancement in Universities of Shandong, College of Animal Science and Technology; Qingdao Agricultural University; Qingdao Shandong China
- Institute of Reproductive Sciences; Qingdao Agricultural University; Qingdao China
| | - Shen Yin
- Key Laboratory of Animal Reproduction and Germplasm Enhancement in Universities of Shandong, College of Animal Science and Technology; Qingdao Agricultural University; Qingdao Shandong China
- Institute of Reproductive Sciences; Qingdao Agricultural University; Qingdao China
| | - Qing-Yuan Sun
- Key Laboratory of Animal Reproduction and Germplasm Enhancement in Universities of Shandong, College of Animal Science and Technology; Qingdao Agricultural University; Qingdao Shandong China
- Institute of Reproductive Sciences; Qingdao Agricultural University; Qingdao China
- State Key Laboratory of Reproductive Biology; Institute of Zoology; Chinese Academy of Sciences; Beijing China
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Stricker SA, Beckstrom B, Mendoza C, Stanislawski E, Wodajo T. Oocyte aging in a marine protostome worm: The roles of maturation-promoting factor and extracellular signal regulated kinase form of mitogen-activated protein kinase. Dev Growth Differ 2016; 58:250-9. [PMID: 26918273 DOI: 10.1111/dgd.12269] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2015] [Revised: 12/29/2015] [Accepted: 01/10/2016] [Indexed: 12/15/2022]
Abstract
The roles of maturation-promoting factor (MPF) and an extracellular signal regulated kinase form of mitogen-activated protein kinase (ERK MAPK) are analyzed during oocyte aging in the marine protostome worm Cerebratulus. About a day after removal from the ovary, unfertilized metaphase-I-arrested oocytes of Cerebratulus begin to flatten and swell before eventually lysing, thereby exhibiting characteristics of a necroptotic mode of regulated cell death. Based on immunoblots probed with phospho-specific antibodies, MPF and ERK are initially active in freshly mature specimens. However, as oocytes age, both kinase activities decline, with ERK deactivation occurring well before MPF downregulation. Experiments using pharmacological modulators indicate that oocyte degradation is promoted by the maturation-initiated activation of ERK as well as by the deactivation of MPF that occurs in extensively aged specimens. The potential significance of these findings is discussed relative to previously published results for apoptotic eggs and oocytes of echinoderm and vertebrate deuterostomes.
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Affiliation(s)
- Stephen A Stricker
- Department of Biology, MSC03 2020, 1 University of New Mexico, Albuquerque, NM, 87131, USA
| | - Bradley Beckstrom
- Department of Biology, MSC03 2020, 1 University of New Mexico, Albuquerque, NM, 87131, USA
| | - Cristina Mendoza
- Department of Biology, MSC03 2020, 1 University of New Mexico, Albuquerque, NM, 87131, USA
| | - Emma Stanislawski
- Department of Biology, MSC03 2020, 1 University of New Mexico, Albuquerque, NM, 87131, USA
| | - Tewodros Wodajo
- Department of Biology, MSC03 2020, 1 University of New Mexico, Albuquerque, NM, 87131, USA
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Trapphoff T, Heiligentag M, Dankert D, Demond H, Deutsch D, Fröhlich T, Arnold GJ, Grümmer R, Horsthemke B, Eichenlaub-Ritter U. Postovulatory aging affects dynamics of mRNA, expression and localization of maternal effect proteins, spindle integrity and pericentromeric proteins in mouse oocytes. Hum Reprod 2016; 31:133-49. [PMID: 26577303 PMCID: PMC5853592 DOI: 10.1093/humrep/dev279] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2015] [Revised: 10/06/2015] [Accepted: 10/13/2015] [Indexed: 12/20/2022] Open
Abstract
STUDY QUESTION Is the postovulatory aging-dependent differential decrease of mRNAs and polyadenylation of mRNAs coded by maternal effect genes associated with altered abundance and distribution of maternal effect and RNA-binding proteins (MSY2)? SUMMARY ANSWER Postovulatory aging results in differential reduction in abundance of maternal effect proteins, loss of RNA-binding proteins from specific cytoplasmic domains and critical alterations of pericentromeric proteins without globally affecting protein abundance. WHAT IS KNOWN ALREADY Oocyte postovulatory aging is associated with differential alteration in polyadenylation and reduction in abundance of mRNAs coded by selected maternal effect genes. RNA-binding and -processing proteins are involved in storage, polyadenylation and degradation of mRNAs thus regulating stage-specific recruitment of maternal mRNAs, while chromosomal proteins that are stage-specifically expressed at pericentromeres, contribute to control of chromosome segregation and regulation of gene expression in the zygote. STUDY DESIGN, SIZE, DURATION Germinal vesicle (GV) and metaphase II (MII) oocytes from sexually mature C57B1/6J female mice were investigated. Denuded in vivo or in vitro matured MII oocytes were postovulatory aged and analyzed by semiquantitative confocal microscopy for abundance and localization of polyadenylated RNAs, proteins of maternal effect genes (transcription activator BRG1 also known as ATP-dependent helicase SWI/SNF related, matrix associated, actin dependent regulator of chromatin, subfamily a, member 4 (SMARCA4) and NOD-like receptor family pyrin domain containing 5 (NLRP5) also known as MATER), RNA-binding proteins (MSY2 also known as germ cell-specific Y-box-binding protein, YBX2), and post-transcriptionally modified histones (trimethylated histone H3K9 and acetylated histone H4K12), as well as pericentromeric ATRX (alpha thalassemia/mental retardation syndrome X-linked, also termed ATP-dependent helicase ATRX or X-linked nuclear protein (XNP)). For proteome analysis five replicates of 30 mouse oocytes were analyzed by selected reaction monitoring (SRM). MATERIAL AND METHODS GV and MII oocytes were obtained from large antral follicles or ampullae of sexually mature mice, respectively. Denuded MII oocytes were aged for 24 h post ovulation. For analysis of distribution and abundance of polyadenylated RNAs fixed oocytes were in situ hybridized to Cy5 labeled oligo(dT)20 nucleotides. Absolute quantification of protein concentration per oocyte of selected proteins was done by SRM proteome analysis. Relative abundance of ATRX was assessed by confocal laser scanning microscopy (CLSM) of whole mount formaldehyde fixed oocytes or after removal of zona and spreading. MSY2 protein distribution and abundance was studied in MII oocytes prior to, during and after exposure to nocodazole, or after aging for 2 h in presence of H2O2 or for 24 h in presence of a glutathione donor, glutathione ethylester (GEE). MAIN RESULTS AND ROLE OF CHANCE The significant reduction in abundance of proteins (P < 0.001) translated from maternal mRNAs was independent of polyadenylation status, while their protein localization was not significantly changed by aging. Most of other proteins quantified by SRM analysis did not significantly change in abundance upon aging except MSY2 and GTSF1. MSY2 was enriched in the subcortical RNP domain (SCRD) and in the spindle chromosome complex (SCC) in a distinct pattern, right and left to the chromosomes. There was a significant loss of MSY2 from the SCRD (P < 0.001) and the spindle after postovulatory aging. Microtubule de- and repolymerization caused reversible loss of MSY2 spindle-association whereas H2O2 stress did not significantly decrease MSY2 abundance. Aging in presence of GEE decreased significantly (P < 0.05) the aging-related overall and cytoplasmic loss of MSY2. Postovulatory aging increased significantly spindle abnormalities, unaligned chromosomes, and abundance of acetylated histone H4K12, and decreased pericentromeric trimethylated histone H3K9 (all P < 0.001). Spreading revealed a highly significant increase in pericentromeric ATRX (P < 0.001) upon ageing. Thus, the significantly reduced abundance of MSY2 protein, especially at the SCRD and the spindle may disturb the spatial control and timely recruitment, deadenylation and degradation of developmentally important RNAs. An autonomous program of degradation appears to exist which transiently and specifically induces the loss and displacement of transcripts and specific maternal proteins independent of fertilization in aging oocytes and thereby can critically affect chromosome segregation and gene expression in the embryo after fertilization. LIMITATION, REASONS FOR CAUTION We used the mouse oocyte to study processes associated with postovulatory aging, which may not entirely reflect processes in aging human oocytes. However, increases in spindle abnormalities, unaligned chromosomes and H4K12 acetylated histones, as well as in mRNA abundance and polyadenylation have been observed also in aged human oocytes suggesting conserved processes in aging. WIDER IMPLICATIONS OF THE FINDINGS Postovulatory aging precociously induces alterations in expression and epigenetic modifications of chromatin by ATRX and in histone pattern in MII oocytes that normally occur after fertilization, possibly contributing to disturbances in the oocyte-to-embryo transition (OET) and the zygotic gene activation (ZGA). These observations in mouse oocytes are also relevant to explain disturbances and reduced developmental potential of aged human oocytes and caution to prevent oocyte aging in vivo and in vitro. STUDY FUNDING/COMPETING INTERESTS The study has been supported by the German Research Foundation (DFG) (EI 199/7-1 | GR 1138/12-1 | HO 949/21-1 and FOR 1041). There is no competing interest.
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Affiliation(s)
- T Trapphoff
- Institute of Gene Technology/Microbiology, University of Bielefeld, Bielefeld, Germany
| | - M Heiligentag
- Institute of Gene Technology/Microbiology, University of Bielefeld, Bielefeld, Germany
| | - D Dankert
- Institute of Anatomy, University Hospital, University Duisburg-Essen, Essen, Germany
| | - H Demond
- Institute of Human Genetics, University Hospital, University Duisburg-Essen, Essen, Germany
| | - D Deutsch
- Laboratory for Functional Genome Analysis, Gene Center, Ludwig-Maximilians-Universität München, Munich, Germany
| | - T Fröhlich
- Laboratory for Functional Genome Analysis, Gene Center, Ludwig-Maximilians-Universität München, Munich, Germany
| | - G J Arnold
- Laboratory for Functional Genome Analysis, Gene Center, Ludwig-Maximilians-Universität München, Munich, Germany
| | - R Grümmer
- Institute of Anatomy, University Hospital, University Duisburg-Essen, Essen, Germany
| | - B Horsthemke
- Institute of Human Genetics, University Hospital, University Duisburg-Essen, Essen, Germany
| | - U Eichenlaub-Ritter
- Institute of Gene Technology/Microbiology, University of Bielefeld, Bielefeld, Germany
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Prasad S, Tiwari M, Koch B, Chaube SK. Morphological, cellular and molecular changes during postovulatory egg aging in mammals. J Biomed Sci 2015; 22:36. [PMID: 25994054 PMCID: PMC4440248 DOI: 10.1186/s12929-015-0143-1] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2015] [Accepted: 05/01/2015] [Indexed: 11/29/2022] Open
Abstract
Postovulatory aging is associated with several morphological, cellular and molecular changes that deteriorate egg quality either by inducing abortive spontaneous egg activation (SEA) or by egg apoptosis. The reduced egg quality results in poor fertilization rate, embryo quality and reproductive outcome. Although postovulatory aging-induced abortive SEA has been reported in several mammalian species, the molecular mechanism(s) underlying this process remains to be elucidated. The postovulatory aging-induced morphological and cellular changes are characterized by partial cortical granules exocytosis, zona pellucida hardening, exit from metaphase-II (M-II)arrest and initiation of extrusion of second polar body in aged eggs. The molecular changes include reduction of adenosine 3',5'- cyclic monophosphate (cAMP) level, increase of reactive oxygen species (ROS) and thereby cytosolic free calcium (Ca2+) level. Increased levels of cAMP and/or ROS trigger accumulation of Thr-14/Tyr-15 phosphorylated cyclin-dependent kinase 1 (Cdk1) on one hand and degradation of cyclin B1 through ubiquitin-mediated proteolysis on the other hand to destabilize maturation promoting factor (MPF). The destabilized MPF triggers postovulatory aging-induced abortive SEA and limits various assisted reproductive technologies (ARTs) outcome in several mammalian species. Use of certain drugs that can either increase cAMP or reduce ROS level would prevent postovulatory aging-induced deterioration in egg quality so that more number of good quality eggs can be made available to improve ART outcome in mammals including human.
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Affiliation(s)
- Shilpa Prasad
- Cell Physiology Laboratory, Biochemistry Unit, Department of Zoology, Banaras Hindu University, Varanasi, 221005, UP, India.
| | - Meenakshi Tiwari
- Cell Physiology Laboratory, Biochemistry Unit, Department of Zoology, Banaras Hindu University, Varanasi, 221005, UP, India.
| | - Biplob Koch
- Genotoxicology and Cancer Biology Laboratory, Department of Zoology, Banaras Hindu University, Varanasi, 221005, UP, India.
| | - Shail K Chaube
- Cell Physiology Laboratory, Biochemistry Unit, Department of Zoology, Banaras Hindu University, Varanasi, 221005, UP, India.
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Matsunaga R, Horiuchi T. ICSI with the Assistance of Meiotic Spindle Imaging for the Production of High Quality Embryos. ACTA ACUST UNITED AC 2015. [DOI: 10.1274/jmor.32.3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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20
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Lee SE, Kim EY, Choi HY, Moon JJ, Park MJ, Lee JB, Jeong CJ, Park SP. Rapamycin rescues the poor developmental capacity of aged porcine oocytes. ASIAN-AUSTRALASIAN JOURNAL OF ANIMAL SCIENCES 2014; 27:635-47. [PMID: 25049998 PMCID: PMC4093196 DOI: 10.5713/ajas.2013.13816] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/13/2013] [Revised: 01/22/2014] [Accepted: 02/21/2014] [Indexed: 11/27/2022]
Abstract
Unfertilized oocytes age inevitably after ovulation, which limits their fertilizable life span and embryonic development. Rapamycin affects mammalian target of rapamycin (mTOR) expression and cytoskeleton reorganization during oocyte meiotic maturation. The goal of this study was to examine the effects of rapamycin treatment on aged porcine oocytes and their in vitro development. Rapamycin treatment of aged oocytes for 24 h (68 h in vitro maturation [IVM]; 44 h+10 μM rapamycin/24 h, 47.52±5.68) or control oocytes (44 h IVM; 42.14±4.40) significantly increased the development rate and total cell number compared with untreated aged oocytes (68 h IVM, 22.04±5.68) (p<0.05). Rapamycin treatment of aged IVM oocytes for 24 h also rescued aberrant spindle organization and chromosomal misalignment, blocked the decrease in the level of phosphorylated-p44/42 mitogen-activated protein kinase (MAPK), and increased the mRNA expression of cytoplasmic maturation factor genes (MOS, BMP15, GDF9, and CCNB1) compared with untreated, 24 h-aged IVM oocytes (p<0.05). Furthermore, rapamycin treatment of aged oocytes decreased reactive oxygen species (ROS) activity and DNA fragmentation (p<0.05), and downregulated the mRNA expression of mTOR compared with control or untreated aged oocytes. By contrast, rapamycin treatment of aged oocytes increased mitochondrial localization (p<0.05) and upregulated the mRNA expression of autophagy (BECN1, ATG7, MAP1LC3B, ATG12, GABARAP, and GABARAPL1), anti-apoptosis (BCL2L1 and BIRC5; p<0.05), and development (NANOG and SOX2; p<0.05) genes, but it did not affect the mRNA expression of pro-apoptosis genes (FAS and CASP3) compared with the control. This study demonstrates that rapamycin treatment can rescue the poor developmental capacity of aged porcine oocytes.
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Affiliation(s)
- Seung Eun Lee
- Stem Cell Research Center, Jeju National University, Jeju 690-756, Korea
| | - Eun Young Kim
- Stem Cell Research Center, Jeju National University, Jeju 690-756, Korea ; Miraebio Research Institute, Mirae Biotech, Seoul 143-854, Korea
| | - Hyun Yong Choi
- Stem Cell Research Center, Jeju National University, Jeju 690-756, Korea
| | - Jeremiah Jiman Moon
- Stem Cell Research Center, Jeju National University, Jeju 690-756, Korea ; Faculty of Biotechnology, College of Applied Life Science, Jeju National University, Jeju 690-756, Korea
| | - Min Jee Park
- Stem Cell Research Center, Jeju National University, Jeju 690-756, Korea ; Miraebio Research Institute, Mirae Biotech, Seoul 143-854, Korea . ; Faculty of Biotechnology, College of Applied Life Science, Jeju National University, Jeju 690-756, Korea
| | | | | | - Se Pill Park
- Stem Cell Research Center, Jeju National University, Jeju 690-756, Korea ; Miraebio Research Institute, Mirae Biotech, Seoul 143-854, Korea . ; Faculty of Biotechnology, College of Applied Life Science, Jeju National University, Jeju 690-756, Korea
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Xiao X, Zi XD, Niu HR, Xiong XR, Zhong JC, Li J, Wang L, Wang Y. Effect of addition of FSH, LH and proteasome inhibitor MG132 to in vitro maturation medium on the developmental competence of yak (Bos grunniens) oocytes. Reprod Biol Endocrinol 2014; 12:30. [PMID: 24754924 PMCID: PMC3998235 DOI: 10.1186/1477-7827-12-30] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/20/2014] [Accepted: 04/14/2014] [Indexed: 01/17/2023] Open
Abstract
BACKGROUND The competence for embryonic development after IVF is low in the yak, therefore, we investigated the effects of supplementation of FSH, LH and the proteasome inhibitor MG132 in IVM media on yak oocyte competence for development after IVF. METHODS In Experiment 1, yak cumulus-oocyte complexes (COCs) were in vitro matured (IVM) in TCM-199 with 20% fetal calf serum (FCS), 1 microg/mL estradiol-17beta, and different combinations of LH (50 or 100 IU/mL) and FSH (0, 1, 5, 10 microg/mL) at 38.6 degrees C, 5% CO2 in air for 24 h. Matured oocytes were exposed to frozen-thawed, heparin-capacitated yak sperm. Presumptive zygotes were cultured in SOF medium containing 6 mg/ml BSA, 0.5 mg/mL myoinositol, 3% (v/v) essential amino acids, 1% nonessential amino acids and 100 μg/mL L-glutamine (48 h, 38.5 degrees C, 5% CO2, 5% O2, and 90% N2). In Experiment 2, cumulus cells were collected at the end of IVM to determine FSHR and LHR mRNA expression by real-time PCR. In Experiment 3 and 4, COCs were cultured in the presence or absence of the proteasomal inhibitor MG132 from either 0-6 h or 18-24 h after initiation of maturation. RESULTS The optimum concentration of FSH and LH in IVM media was 5 microg/mL FSH and 50 IU/mL LH which resulted in the greatest cleavage (79.1%) and blastocyst rates (16.1%). Both FSHR and LHR mRNA were detected in yak cumulus cells after IVM. Treatment with MG132 early in maturation reduced (P<0.05) cleavage and blastocyst rates. Conversely, treatment with MG132 late in maturation improved (P<0.05) blastocyst rate. Optimal results with MG132 were achieved at a concentration of 10 microM. CONCLUSIONS An optimum concentration of FSH and LH in IVM medium, and treatment with MG132 late in maturation can improve yak oocytes competence for development after IVF.
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Affiliation(s)
- Xiao Xiao
- College of Life Science and Technology, Southwest University for Nationalities, Chengdu 610041, People’s Republic of China
| | - Xiang-Dong Zi
- College of Life Science and Technology, Southwest University for Nationalities, Chengdu 610041, People’s Republic of China
| | - Hui-Ran Niu
- College of Life Science and Technology, Southwest University for Nationalities, Chengdu 610041, People’s Republic of China
| | - Xian-Rong Xiong
- College of Life Science and Technology, Southwest University for Nationalities, Chengdu 610041, People’s Republic of China
| | - Jin-Cheng Zhong
- College of Tibetan Plateau Research, Southwest University for Nationalities, Chengdu 610041, People’s Republic of China
| | - Jian Li
- College of Tibetan Plateau Research, Southwest University for Nationalities, Chengdu 610041, People’s Republic of China
| | - Li Wang
- College of Life Science and Technology, Southwest University for Nationalities, Chengdu 610041, People’s Republic of China
| | - Yong Wang
- College of Tibetan Plateau Research, Southwest University for Nationalities, Chengdu 610041, People’s Republic of China
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Lee AR, Thanh Ha L, Kishigami S, Hosoi Y. Abnormal lysine acetylation with postovulatory oocyte aging. Reprod Med Biol 2013; 13:81-86. [PMID: 29699152 DOI: 10.1007/s12522-013-0172-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2013] [Accepted: 11/20/2013] [Indexed: 11/30/2022] Open
Abstract
Background A postovulatory mammalian oocyte decreases developmental potential with in vivo aging in the oviduct or in vitro aging in the culture dish. The mechanism underlying oocyte aging still largely remains an enigma. Accumulating data suggest that the epigenetic alterations such as histone acetylation are also associated with postovulatory aging. Objective To perform a review evaluating a new aspect of oocyte aging in terms of the epigenetic alterations focusing on lysine acetylation. Methods In addition to a search of the literature in Pubmed, we introduced our recent published data. Results Histone acetylation in the mouse oocyte increases during aging, potentially impacting gene regulation in the subsequent embryonic development. Oocyte aging results in increased acetylation of alpha-tubulin, a non-histone protein, and nicotinamide, an inhibitor of class III HDAC, partially prevents some of oocyte aging phenotypes. Conclusion Abnormal regulation of protein acetylation itself is suggested in oocyte aging and could contribute to the aging phenotypes.
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Affiliation(s)
- Ah Reum Lee
- Division of Biological Science, Graduate School of Biology-Oriented Science and Technology Kinki University 649-6493 Kinokawa Wakayama Japan
| | - Le Thanh Ha
- Division of Biological Science, Graduate School of Biology-Oriented Science and Technology Kinki University 649-6493 Kinokawa Wakayama Japan
| | - Satoshi Kishigami
- Division of Biological Science, Graduate School of Biology-Oriented Science and Technology Kinki University 649-6493 Kinokawa Wakayama Japan.,PRESTO, Japan Science and Technology Agency 332-0012 Kawaguchi Saitama Japan
| | - Yoshihiko Hosoi
- Division of Biological Science, Graduate School of Biology-Oriented Science and Technology Kinki University 649-6493 Kinokawa Wakayama Japan
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23
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Abstract
With extended periods of time following ovulation, the metaphase II stage oocyte experiences deterioration in quality referred to as post-ovulatory oocyte ageing. Post-ovulatory ageing occurs both in vivo and in vitro and has been associated with reduced fertilization rates, poor embryo quality, post-implantation errors and abnormalities in the offspring. Although the physiological consequences of post-ovulatory oocyte ageing have largely been established, the molecular mechanisms controlling this process are not well defined. This review analyses the relationships between biochemical changes exhibited by the ageing oocyte and the symptoms associated with the ageing phenotype. We also discuss molecular events that are potentially involved in orchestrating post-ovulatory ageing with a particular focus on the role of oxidative stress. We propose that oxidative stress may act as the initiator for a cascade of events that create the aged oocyte phenotype. Specifically, oxidative stress has the capacity to cause a decline in levels of critical cell cycle factors such as maturation-promoting factor, impair calcium homoeostasis, induce mitochondrial dysfunction and directly damage multiple intracellular components of the oocyte such as lipids, proteins and DNA. Finally, this review addresses current strategies for delaying post-ovulatory oocyte ageing with a particular focus on the potential use of compounds such as caffeine or selected antioxidants in the development of more refined media for the preservation of oocyte integrity during IVF procedures.
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Abstract
With extended periods of time following ovulation, the metaphase II stage oocyte experiences deterioration in quality referred to as post-ovulatory oocyte ageing. Post-ovulatory ageing occurs both in vivo and in vitro and has been associated with reduced fertilization rates, poor embryo quality, post-implantation errors and abnormalities in the offspring. Although the physiological consequences of post-ovulatory oocyte ageing have largely been established, the molecular mechanisms controlling this process are not well defined. This review analyses the relationships between biochemical changes exhibited by the ageing oocyte and the symptoms associated with the ageing phenotype. We also discuss molecular events that are potentially involved in orchestrating post-ovulatory ageing with a particular focus on the role of oxidative stress. We propose that oxidative stress may act as the initiator for a cascade of events that create the aged oocyte phenotype. Specifically, oxidative stress has the capacity to cause a decline in levels of critical cell cycle factors such as maturation-promoting factor, impair calcium homoeostasis, induce mitochondrial dysfunction and directly damage multiple intracellular components of the oocyte such as lipids, proteins and DNA. Finally, this review addresses current strategies for delaying post-ovulatory oocyte ageing with a particular focus on the potential use of compounds such as caffeine or selected antioxidants in the development of more refined media for the preservation of oocyte integrity during IVF procedures.
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Salavati M, Ghafari F, Zhang T, Fouladi-Nashta AA. Influence of caffeine pretreatment on biphasic in vitro maturation of dog oocytes. Theriogenology 2013; 80:784-92. [DOI: 10.1016/j.theriogenology.2013.06.020] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2013] [Revised: 06/13/2013] [Accepted: 06/30/2013] [Indexed: 11/29/2022]
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Lord T, Nixon B, Jones KT, Aitken RJ. Melatonin prevents postovulatory oocyte aging in the mouse and extends the window for optimal fertilization in vitro. Biol Reprod 2013; 88:67. [PMID: 23365415 DOI: 10.1095/biolreprod.112.106450] [Citation(s) in RCA: 118] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
Abstract
The quality of metaphase II oocytes deteriorates rapidly following ovulation as the result of an aging process associated with impaired fertilizing potential, disrupted developmental competence, and increased likelihood of embryonic resorption. Because oxidative stress accelerates the onset of apoptosis in oocytes and influences their capacity for fertilization, this study aimed to characterize the significance of such stress in the postovulatory aging of mouse oocytes in vitro. We investigated the ability of the potent antioxidant melatonin to arrest the aging process when used to supplement oocyte culture medium. This study demonstrated that oxidative stress may occur in oocytes after as little as 8 h in culture and coincides with the appearance of early apoptotic markers such as phosphatidylserine externalization, followed 16 h later by caspase activation (P < 0.05) and morphological evidence of oocyte senescence. Importantly, supplementation of oocyte culture medium with 1 mM melatonin was able to significantly relieve the time-dependent appearance of oxidative stress in oocytes (P < 0.05) and, as a result, significantly delay the onset of apoptosis (P < 0.05). Furthermore, melatonin supplementation extended the optimal window for fertilization of oocytes aged for 8 and 16 h in vitro (P < 0.05) and significantly improved the quality of the resulting embryos (P < 0.01). We conclude that melatonin may be a useful tool in a clinical setting to prevent the time-dependent deterioration of oocyte quality following prolonged culture in vitro.
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Affiliation(s)
- Tessa Lord
- Priority Research Centre for Reproductive Biology, School of Environmental and Life Sciences, University of Newcastle, Callaghan, New South Wales, Australia
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Lee AR, Kishigami S, Amano T, Matsumoto K, Wakayama T, Hosoi Y. Nicotinamide: a class III HDACi delays in vitro aging of mouse oocytes. J Reprod Dev 2013; 59:238-44. [PMID: 23474603 PMCID: PMC3934134 DOI: 10.1262/jrd.2012-171] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/04/2022] Open
Abstract
Postovulatory mammalian oocyte developmental potential decreases with aging in
vivo and in vitro. Aging oocytes typically show cellular
fragmentation and chromosome scattering with an abnormally shaped spindle over time.
Previously, it was shown that histone acetylation in the mouse oocyte increased during
aging and that treatment with trichostatin A (TSA), an inhibitor for class I and II
histone deacetylases (HDACs), enhanced the acetylation, that is, aging. In this study, we
examined the effect of nicotinamide (NAM), an inhibitor for class III HDACs, on in
vitro aging of mouse oocytes as well as TSA. We found that treatment with NAM
significantly inhibited cellular fragmentation, spindle elongation and astral microtubules
up to 48 h of culture. Although presence of TSA partially inhibited cellular fragmentation
and spindle elongation up to 36 h of culture, treatment with TSA induced chromosome
scattering at 24 h of culture and more severe cellular fragmentation at 48 h of culture.
Further, we found that α-tubulin, a nonhistone protein, increased acetylation during
aging, suggesting that not only histone but nonhistone protein acetylation may also
increase with oocyte aging. Thus, these data indicate that protein acetylation is
abnormally regulated in aging oocytes, which are associated with a variety of aging
phenotypes, and that class I/II and class III HDACs may play distinct roles in aging
oocytes.
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Affiliation(s)
- Ah Reum Lee
- Division of Biological Science, Graduate School of Biology-Oriented Science and Technology, Kinki University, Wakayama 649-6493, Japan
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You J, Lee E, Bonilla L, Francis J, Koh J, Block J, Chen S, Hansen PJ. Treatment with the proteasome inhibitor MG132 during the end of oocyte maturation improves oocyte competence for development after fertilization in cattle. PLoS One 2012; 7:e48613. [PMID: 23144909 PMCID: PMC3492449 DOI: 10.1371/journal.pone.0048613] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2012] [Accepted: 09/27/2012] [Indexed: 11/18/2022] Open
Abstract
Maturation of the oocyte involves nuclear and cytoplasmic changes that include post-translational processing of proteins. The objective was to investigate whether inhibition of proteasomes during maturation would alter competence of the bovine oocyte for fertilization and subsequent development. Cumulus-oocyte complexes were cultured in the presence or absence of the proteasomal inhibitor MG132 from either 0-6 h or 16-22 h after initiation of maturation. Treatment with MG132 early in maturation prevented progression to meiosis II and reduced fertilization rate and the proportion of oocytes and cleaved embryos that became blastocysts. Conversely, treatment with MG132 late in maturation improved the percentage of oocytes and cleaved embryos that became blastocysts without affecting nuclear maturation or fertilization rate. Optimal results with MG132 were achieved at a concentration of 10 µM - effects were generally not observed at lower or higher concentrations. Using proteomic analysis, it was found that MG132 at the end of maturation increased relative expression of 6 proteins and decreased relative expression of 23. Among those increased by MG132 that are potentially important for oocyte competence are GAPDH, involved in glycolysis, TUBA1C, needed for organellar movement, and two proteins involved in protein folding (P4HB and HYOU1). MG132 decreased amounts of several proteins that exert anti-apoptotic actions including ASNS, HSP90B1, PDIA3 and VCP. Another protein decreased by MG132, CDK5, can lead to apoptosis if aberrantly activated and one protein increased by MG132, P4HB, is anti-apoptotic. Finally, the pregnancy rate of cows receiving embryos produced from oocytes treated with MG132 from 16-22 h of maturation was similar to that for control embryos, suggesting that use of MG132 for production of embryos in vitro does not cause a substantial decrease in embryo quality.
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Affiliation(s)
- Jinyoung You
- College of Veterinary Medicine, Kangwon National University, Chunchon, Korea
| | - Eunsong Lee
- College of Veterinary Medicine, Kangwon National University, Chunchon, Korea
| | - Luciano Bonilla
- Department of Animal Sciences and D.H. Barron Reproductive and Perinatal Biology Research Program, University of Florida, Gainesville, Florida, United States of America
| | - Jasmine Francis
- Department of Animal Sciences and D.H. Barron Reproductive and Perinatal Biology Research Program, University of Florida, Gainesville, Florida, United States of America
| | - Jin Koh
- Interdisciplinary Center for Biotechnology Research, University of Florida, Gainesville, Florida, United States of America
- Dept. of Biology, University of Florida, Gainesville, Florida, United States of America
| | - Jeremy Block
- Department of Animal Sciences and D.H. Barron Reproductive and Perinatal Biology Research Program, University of Florida, Gainesville, Florida, United States of America
- Ovatech LLC, Gainesville, Florida, United States of America
| | - Sixue Chen
- Interdisciplinary Center for Biotechnology Research, University of Florida, Gainesville, Florida, United States of America
- Dept. of Biology, University of Florida, Gainesville, Florida, United States of America
| | - Peter J. Hansen
- Department of Animal Sciences and D.H. Barron Reproductive and Perinatal Biology Research Program, University of Florida, Gainesville, Florida, United States of America
- * E-mail:
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Terashita Y, Wakayama S, Yamagata K, Li C, Sato E, Wakayama T. Latrunculin A Can Improve the Birth Rate of Cloned Mice and Simplify the Nuclear Transfer Protocol by Gently Inhibiting Actin Polymerization1. Biol Reprod 2012; 86:180. [DOI: 10.1095/biolreprod.111.098764] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
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Hosseini S, Asgari V, Ostadhosseini S, Hajian M, Piryaei A, Najarasl M, Nasr-Esfahani M. Potential applications of sheep oocytes as affected by vitrification and in vitro aging. Theriogenology 2012; 77:1741-53. [DOI: 10.1016/j.theriogenology.2011.12.005] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2011] [Revised: 11/28/2011] [Accepted: 12/04/2011] [Indexed: 11/30/2022]
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Zhang N, Wakai T, Fissore RA. Caffeine alleviates the deterioration of Ca(2+) release mechanisms and fragmentation of in vitro-aged mouse eggs. Mol Reprod Dev 2012; 78:684-701. [PMID: 22095868 DOI: 10.1002/mrd.21366] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
The developmental competence of mammalian eggs is compromised by postovulatory aging. We and others have found that in these eggs, the intracellular calcium ([Ca(2+)](i)) responses required for egg activation and initiation of development are altered. Nevertheless, the mechanism(s) underlying this defective Ca(2+) release is not well known. Here, we investigated if the function of IP(3)R1, the major Ca(2+) release channel at fertilization, was undermined in in vitro-aged mouse eggs. We found that in aged eggs, IP(3)R1 displayed reduced function as many of the changes acquired during maturation that enhance IP(3)R1 Ca(2+) conductivity, such as phosphorylation, receptor reorganization and increased Ca(2+) store content ([Ca(2+)](ER)), were lost with increasing postovulatory time. IP(3)R1 fragmentation, possibly associated with the activation of caspase-3, was also observed in these eggs. Many of these changes were prevented when the postovulatory aging of eggs was carried out in the presence of caffeine, which minimized the decline in IP(3)R(1) function and maintained [Ca(2+)](ER) content. Caffeine also maintained mitochondrial membrane potential, as measured by JC-1 fluorescence. We therefore conclude that [Ca(2+)](i) responses in aged eggs are undermined by reduced IP(3)R1 sensitivity, decreased [Ca(2+)](ER) , and compromised mitochondrial function, and that addition of caffeine ameliorates most of these aging-associated changes. Understanding the molecular basis of the protective effects of caffeine will be useful in elucidating, and possibly reversing, the signaling pathway(s) compromised by in vitro culture of eggs.
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Affiliation(s)
- Nan Zhang
- Department of Veterinary and Animal Sciences, University of Massachusetts, Amherst, Massachusetts 01003, USA
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Sun SC, Gao WW, Xu YN, Jin YX, Wang QL, Yin XJ, Cui XS, Kim NH. Degradation of actin nucleators affects cortical polarity of aged mouse oocytes. Fertil Steril 2012; 97:984-90. [PMID: 22306711 DOI: 10.1016/j.fertnstert.2012.01.101] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2011] [Revised: 01/12/2012] [Accepted: 01/12/2012] [Indexed: 11/17/2022]
Abstract
OBJECTIVE To investigate the molecular mechanism of mouse oocyte polarity loss during aging. DESIGN Experimental study. SETTING Academic basic research laboratory. ANIMAL(S) Mice. INTERVENTION(S) Oocytes were collected 16 hours after injection of hCG and cultured in M16 medium for an additional 14 hours with or without caffeine. MAIN OUTCOME MEASURE(S) Expression and localizations of actin nucleators actin-related protein 2/3 complex, JMY, and WAVE2 were examined by immunofluorescence staining, and their messenger RNA levels were examined by real-time reverse transcription-polymerase chain reaction. RESULT(S) The protein and messenger RNA levels of actin-related protein 2/3 complex, JMY, and WAVE2 were decreased in aged oocytes, but the levels were normal in caffeine-treated aged oocytes. CONCLUSION(S) Our data indicated that the loss of oocyte polarity may be due to the degradation of actin nucleators in aged oocytes.
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Affiliation(s)
- Shao-Chen Sun
- Department of Animal Sciences, Chungbuk National University, Cheongju, Chungbuk, South Korea
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Yoo JG, Hur CG, Park MR, Park JY, Hwang KC, Kim JH, Kim JH, Cho SK. Electrical activation enhances pre-implantation embryo development following sperm injection into in vitro matured pig oocytes. J Vet Med Sci 2011; 74:429-34. [PMID: 22123305 DOI: 10.1292/jvms.11-0073] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The objective of this study was to evaluate the effect of electrical stimulation (EST) on pronuclear formation, chromosomal constitution, and developmental capability among in vitro matured pig oocytes following intracytoplasmic sperm injection (ICSI). After ICSI, the oocytes were randomly distributed and cultured into 3 groups: the EST activated ICSI group, non-activation ICSI group, and in vitro fertilization (IVF) group. The proportion of oocytes in which 2 pronuclei were formed in ICSI groups was significantly higher in the former groups than in the IVF group (96.2 and 93.5 vs. 64.5%, respectively, P<0.05). The cleavage rate was significantly higher in EST activated ICSI group (78.6%) than in the IVF and non-activated ICSI groups (51.8 and 46.0%, respectively, P<0.05), as was the proportion of oocytes that developed to the blastocyst stage at day 7 (18.9 vs. 11.6 and 9.1%, respectively, P<0.05). Diploid blastocysts were observed in 52.4, 63.0, and 65.2% of oocytes in the IVF, activated, and non-activated ICSI groups, respectively. Eight out of 23 gilts (34.8%) were confirmed to be pregnant in activated ICSI groups, but none of these pregnancies were carried to term. These results show that oocyte activation after ICSI is effective in elevating the cleavage rate and blastocyst development, while ensuring normal chromosome composition. Further research is needed to determine the pregnancy maintenance requirements for ICSI-embryos in pigs.
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Affiliation(s)
- Jae-Gyu Yoo
- Division of Animal Science, National Institute of Animal Science, Rural Development Administration, Suwon, Gyeonggi 441-706, Republic of Korea
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