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Nguyen HT, Somfai T, Hirao Y, Dang-Nguyen TQ, Linh NV, Nguyen BX, Nguyen NT, Nguyen HT, Nguyen VH, Kaneko H, Takagi M, Kikuchi K. Dibutyryl-cAMP and roscovitine differently affect premature meiotic resumption and embryo development of vitrified immature porcine oocytes. Anim Sci J 2022; 93:e13795. [PMID: 36562274 DOI: 10.1111/asj.13795] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2022] [Revised: 11/08/2022] [Accepted: 11/22/2022] [Indexed: 12/24/2022]
Abstract
Vitrification and warming can trigger premature meiosis in immature porcine oocytes. Our aim was to compare the efficacies of two meiotic inhibitors, dibutyryl-cAMP and roscovitine for the meiosis synchronization during in vitro maturation (IVM) of porcine oocytes vitrified at the germinal vesicle (GV) stage. We first compared the efficacy of 1 mM dibutyryl-cAMP and 25 μM roscovitine on meiotic arrest during the first 22 h of IVM. Dibutyryl-cAMP could maintain the GV stage in 83.5% of oocytes; however, roscovitine was even more effective (96.6%), whereas only 17.4% of the oocytes remained at the GV stage without these additives. Temporal meiotic arrest for 22 h by roscovitine did not reduce the percentage of oocytes reaching the Metaphase II stage during subsequent IVM. However, after parthenogenetic stimulation or in vitro fertilization, subsequent embryo development to the blastocyst stage was compromised after roscovitine treatment, whereas dibutyryl-cAMP improved the percentage of blastocyst development. In conclusion, dibutyryl-cAMP could derogate but not completely prevent premature meiosis in vitrified oocytes, whereas roscovitine could more efficiently prevent it. However, for embryo production, the use of roscovitine was disadvantageous, whereas the use of dibutyryl-cAMP was beneficial.
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Affiliation(s)
- Hiep Thi Nguyen
- Institute of Agrobiological Sciences, National Agriculture and Food Research Organization (NARO), Tsukuba, Ibaraki, Japan.,Institute of Biotechnology (IBT), Vietnam Academy of Science and Technology (VAST), Hanoi, Vietnam.,The United Graduate School of Veterinary Science, Yamaguchi University, Yamaguchi, Yamaguchi, Japan
| | - Tamás Somfai
- Institute of Agrobiological Sciences, National Agriculture and Food Research Organization (NARO), Tsukuba, Ibaraki, Japan
| | - Yuji Hirao
- Institute of Livestock and Grassland Science, NARO, Tsukuba, Ibaraki, Japan
| | - Thanh Quang Dang-Nguyen
- Institute of Agrobiological Sciences, National Agriculture and Food Research Organization (NARO), Tsukuba, Ibaraki, Japan
| | - Nguyen Viet Linh
- Institute of Biotechnology (IBT), Vietnam Academy of Science and Technology (VAST), Hanoi, Vietnam
| | - Bui Xuan Nguyen
- Institute of Biotechnology (IBT), Vietnam Academy of Science and Technology (VAST), Hanoi, Vietnam
| | - Nhung Thi Nguyen
- Institute of Biotechnology (IBT), Vietnam Academy of Science and Technology (VAST), Hanoi, Vietnam
| | - Hong Thi Nguyen
- Institute of Biotechnology (IBT), Vietnam Academy of Science and Technology (VAST), Hanoi, Vietnam
| | - Van Hanh Nguyen
- Institute of Biotechnology (IBT), Vietnam Academy of Science and Technology (VAST), Hanoi, Vietnam
| | - Hiroyuki Kaneko
- Institute of Agrobiological Sciences, National Agriculture and Food Research Organization (NARO), Tsukuba, Ibaraki, Japan
| | - Mitsuhiro Takagi
- The United Graduate School of Veterinary Science, Yamaguchi University, Yamaguchi, Yamaguchi, Japan
| | - Kazuhiro Kikuchi
- Institute of Agrobiological Sciences, National Agriculture and Food Research Organization (NARO), Tsukuba, Ibaraki, Japan.,The United Graduate School of Veterinary Science, Yamaguchi University, Yamaguchi, Yamaguchi, Japan
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Zhu S, Jia YJ, Pan LZ, Gong S, Sun MJ, Wang GL, Luo MJ, Tan JH. Meiotic block with roscovitine improves competence of porcine oocytes by fine-tuning activities of different cyclin-dependent kinases. J Cell Physiol 2020; 235:7530-7540. [PMID: 32100885 DOI: 10.1002/jcp.29655] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2019] [Accepted: 02/13/2020] [Indexed: 11/07/2022]
Abstract
Successful use of oocytes from small follicles (SFs) is of great importance for animal embryo production and human in vitro fertilization with reduced hormone-related side effects. How in vitro meiotic arrest maintenance (MAM) increases the competence of oocytes is not clear. In this study, pig oocytes recovered from SF of 1-2 mm and medium-follicles (MF) of 3-6 mm in diameter from abattoir ovaries were treated by various MAM treatments to improve their competence. The results showed that 25 µM roscovitine or 1 mM db-cAMP efficiently blocked germinal vesicle breakdown in both SF and MF oocytes suggesting a similar cyclin-dependent kinase (CDK) 1 level between the two oocyte groups. MAM with 15- and 25-µM roscovitine alone or with 1-mM db-cAMP improved competence of SF and MF oocytes, respectively, with a promoted chromatin configuration transition from surrounded nucleoli (SN) to re-decondensation (RDC) pattern that supported substantial gene transcription. However, MAM with db-cAMP alone or with higher concentrations of roscovitine did not improve oocyte competence, could not support an SN-to-RDC transition, and/or evoked a premature chromatin condensation (PMC) that suppressed gene transcription. Both CDK2 and CDK5 contents were higher (p < .05) in MF than in SF oocytes. It is concluded that the competence of pig oocytes, particularly that of SF oocytes can be improved by MAM using a proper roscovitine concentration that promotes gene transcription by inhibiting CDK5 while letting CDK2 off to prevent PMC.
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Affiliation(s)
- Shuai Zhu
- Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, College of Animal Science and Veterinary Medicine, Tai'an, China
| | - Ying-Jun Jia
- College of Life Science, North Agricultural University, Harbin, China
| | - Liu-Zhu Pan
- Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, College of Animal Science and Veterinary Medicine, Tai'an, China
| | - Shuai Gong
- Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, College of Animal Science and Veterinary Medicine, Tai'an, China
| | - Ming-Ju Sun
- College of Life Science, North Agricultural University, Harbin, China
| | - Guo-Liang Wang
- Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, College of Animal Science and Veterinary Medicine, Tai'an, China
| | - Ming-Jiu Luo
- Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, College of Animal Science and Veterinary Medicine, Tai'an, China
| | - Jing-He Tan
- Shandong Provincial Key Laboratory of Animal Biotechnology and Disease Control and Prevention, College of Animal Science and Veterinary Medicine, Tai'an, China
- College of Life Science, North Agricultural University, Harbin, China
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An L, Liu J, Du Y, Liu Z, Zhang F, Liu Y, Zhu X, Ling P, Chang S, Hu Y, Li Y, Xu B, Yang L, Xue F, Presicce GA, Du F. Synergistic effect of cysteamine, leukemia inhibitory factor, and Y27632 on goat oocyte maturation and embryo development in vitro. Theriogenology 2018; 108:56-62. [DOI: 10.1016/j.theriogenology.2017.11.028] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2017] [Revised: 11/17/2017] [Accepted: 11/22/2017] [Indexed: 12/11/2022]
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Kumar S, Kumar M, Dholpuria S, Sarwalia P, Batra V, De S, Kumar R, Datta TK. Transient Arrest of Germinal Vesicle Breakdown Improved In Vitro Development Potential of Buffalo (Bubalus Bubalis) Oocytes. J Cell Biochem 2017; 119:278-289. [PMID: 28543358 DOI: 10.1002/jcb.26171] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2016] [Accepted: 05/24/2017] [Indexed: 11/09/2022]
Abstract
Germinal vesicle breakdown (GVBD) is the first milestone that an oocyte needs to achieve toward completing the maturation and gaining potential to fertilize. Significantly lower in vitro embryo production rate in buffaloes can be attributed to heterogeneity of GVBD occurrence among oocytes obtained from abattoir derived ovaries. Evidence from our earlier work had suggested that different qualities of buffalo oocytes differ significantly in their timing of GVBD. Besides, these oocytes also differ in terms of volume of Akt phosphorylation, which initiates the process of GVBD. With objective of synchronizing the oocytes for GVBD, immature buffalo oocytes were subjected to a two-step culture protocol, initially in the presence of GVBD inhibitors and subsequently, in vitro maturation (IVM) with added SC79 (activates Akt). Expression of developmentally important genes was assessed along with embryo development rate and blastocyst health to interpret the consequences. Oocytes subjected to a short GVBD inhibition period of 6 h followed by IVM with SC79 resulted in improved cleavage and blastocyst rates. Resultant blastocysts also possessed higher ICM: TE ratio. Further, GVBD inhibited oocytes displayed a sustained cytoplasmic maturation status in terms of reorganization of cortical granules (CGs), mitochondrial membrane potential, and glutathione levels during the period of inhibition. We conclude that a temporary GVBD arrest of buffalo oocytes and modulation of Akt improves the in vitro embryo development rate as well as quality of resultant embryos. Besides, our meiotic arrest protocol does not affect the cytoplasmic maturation. J. Cell. Biochem. 119: 278-289, 2018. © 2017 Wiley Periodicals, Inc.
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Affiliation(s)
- Sandeep Kumar
- Animal Biotechnology Centre, National Dairy Research Institute, Karnal, Haryana, 132001, India
| | - Manish Kumar
- Animal Biotechnology Centre, National Dairy Research Institute, Karnal, Haryana, 132001, India
| | - Sunny Dholpuria
- Animal Biotechnology Centre, National Dairy Research Institute, Karnal, Haryana, 132001, India
| | - Parul Sarwalia
- Animal Biotechnology Centre, National Dairy Research Institute, Karnal, Haryana, 132001, India
| | - Vipul Batra
- Animal Biotechnology Centre, National Dairy Research Institute, Karnal, Haryana, 132001, India
| | - Sachinandan De
- Animal Biotechnology Centre, National Dairy Research Institute, Karnal, Haryana, 132001, India
| | - Rakesh Kumar
- Animal Biotechnology Centre, National Dairy Research Institute, Karnal, Haryana, 132001, India
| | - Tirtha Kumar Datta
- Animal Biotechnology Centre, National Dairy Research Institute, Karnal, Haryana, 132001, India
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Paramio MT, Izquierdo D. Recent advances in in vitro embryo production in small ruminants. Theriogenology 2016; 86:152-9. [DOI: 10.1016/j.theriogenology.2016.04.027] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2015] [Revised: 11/19/2015] [Accepted: 03/14/2016] [Indexed: 10/21/2022]
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Kim KJ, Chun JL, Lee KB, Lee JH, Park KS, Han KW, Lee BM, Kim EY, Kim JM, Kim MK. Effect of acteoside on the re-localization and abnormal morphology of mitochondria in porcine oocytes during in vitro maturation. J Assist Reprod Genet 2016; 33:939-48. [PMID: 27189054 DOI: 10.1007/s10815-016-0729-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2016] [Accepted: 05/03/2016] [Indexed: 11/28/2022] Open
Abstract
PURPOSE The aim of this study is to investigate the effect of acteoside, an antioxidant, on in vitro maturation (IVM) of oocytes to improve early parthenogenetic embryonic developmental competence. METHODS Porcine immature oocytes (total 770) were cultured in IVM medium with acteoside at various concentrations, 0 (control), 10, 30, and 50 μM. Each group was assessed for maturation and subsequent development rates, reactive oxygen species (ROS) level (15 oocytes per group and four independent experiments performed), ultrastructure observation (15 oocytes per group), mitochondrial activity (30 oocytes per groups and three independent experiments performed), and expression patterns of apoptosis-related genes (100 expended parthenogenetic embryos per group and three independent experiment performed). Main outcome measures were the rates of IVM, blastocyst formation, ROS, mitochondria, and expression of apoptosis-related genes in oocytes treated with acteoside. RESULT(S) Addition of acteoside during IVM did not change the maturation efficiency of oocytes but improved the rate of blastocyst formation with significantly decreased ROS level. Moreover, in acteoside-treated oocytes, cytoplasmic maturation was improved with morphologically uniform distribution of mitochondria and lipid droplets in cytoplasm. Acteoside supplementation also increased the mRNA expression levels of antiapoptotic genes and reduced those of pro-apoptotic genes. CONCLUSION(S) Acteoside supplementation in IVM medium improves the oocyte quality and subsequent development of pre-implantation embryos that would eventually contribute to produce embryos with high embryonic development competence.
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Affiliation(s)
- Keun Jung Kim
- Department of Animal Science and Biotechnology, College of Agriculture and Life Science, Chungnam National University, Daejeon, 305-764, Republic of Korea
| | - Ju Lan Chun
- Department of Animal Science and Biotechnology, College of Agriculture and Life Science, Chungnam National University, Daejeon, 305-764, Republic of Korea
| | - Kyung-Bon Lee
- Department of Biology Education, College of Education, Chonnam National University, Gwangju, 500-757, Republic of Korea
| | - Ji Hye Lee
- Department of Animal Science and Biotechnology, College of Agriculture and Life Science, Chungnam National University, Daejeon, 305-764, Republic of Korea
| | - Kang-Sun Park
- Department of Animal Science and Biotechnology, College of Agriculture and Life Science, Chungnam National University, Daejeon, 305-764, Republic of Korea
| | - Kil Woo Han
- Department of Animal Science and Biotechnology, College of Agriculture and Life Science, Chungnam National University, Daejeon, 305-764, Republic of Korea
| | - Bo Myeong Lee
- Department of Animal Science and Biotechnology, College of Agriculture and Life Science, Chungnam National University, Daejeon, 305-764, Republic of Korea
| | - Eun Young Kim
- Department of Animal Science and Biotechnology, College of Agriculture and Life Science, Chungnam National University, Daejeon, 305-764, Republic of Korea
| | - Jin Man Kim
- Department of Pathology, School of Medicine, Chungnam National University, Daejeon, 301-747, Republic of Korea
| | - Min Kyu Kim
- Department of Animal Science and Biotechnology, College of Agriculture and Life Science, Chungnam National University, Daejeon, 305-764, Republic of Korea.
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Maziero RRD, Guaitolini CRF, Paschoal DM, Kievitsbosch T, Guastali MD, Moraes CN, Landim-Alvarenga FC. Effect of Temporary Meiotic Attenuation of Oocytes with Butyrolactone I and Roscovitine in Resistance to Bovine Embryos on Vitrification. Reprod Domest Anim 2016; 51:204-11. [DOI: 10.1111/rda.12667] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2015] [Accepted: 12/22/2015] [Indexed: 12/01/2022]
Affiliation(s)
- RRD Maziero
- Department of Animal Reproduction; School of Veterinary Medicine and Animal Science; Universidade Estadual Paulista - UNESP; Botucatu São Paulo Brazil
| | - CRF Guaitolini
- Department of Animal Reproduction; School of Veterinary Medicine and Animal Science; Universidade Estadual Paulista - UNESP; Botucatu São Paulo Brazil
| | - DM Paschoal
- Department of Animal Reproduction; School of Veterinary Medicine and Animal Science; Universidade Estadual Paulista - UNESP; Botucatu São Paulo Brazil
| | - T Kievitsbosch
- Center for Veterinary Health Sciences, Physiological Sciences; Oklahoma State University (OSU); Stillwater OK USA
| | - MD Guastali
- Department of Animal Reproduction; School of Veterinary Medicine and Animal Science; Universidade Estadual Paulista - UNESP; Botucatu São Paulo Brazil
| | - CN Moraes
- Department of Animal Reproduction; School of Veterinary Medicine and Animal Science; Universidade Estadual Paulista - UNESP; Botucatu São Paulo Brazil
| | - FC Landim-Alvarenga
- Department of Animal Reproduction; School of Veterinary Medicine and Animal Science; Universidade Estadual Paulista - UNESP; Botucatu São Paulo Brazil
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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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Carrying-over effects of GVBD blocking on post-blocking meiotic progression of oocytes: species difference and the signaling pathway leading to MPF activation. PLoS One 2014; 9:e103838. [PMID: 25078078 PMCID: PMC4117542 DOI: 10.1371/journal.pone.0103838] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2014] [Accepted: 07/07/2014] [Indexed: 11/19/2022] Open
Abstract
Efforts to improve the quality of in vitro matured oocytes by blocking germinal vesicle breakdown (GVBD) and allowing more time for ooplasmic maturation have achieved little due to a lack of knowledge on the molecular events during GVBD blocking. Such knowledge is also important for studies aimed at regulating gene expression in maturing oocytes prior to GVBD. We studied species difference and signaling pathways leading to the carrying-over effect of GVBD blocking on post-blocking meiotic progression (PBMP). Overall, GVBD-blocking with roscovitine decelerated PBMP of mouse oocytes but accelerated that of pig oocytes. During blocking culture, whereas cyclin B of pig oocytes increased continuously, that of mouse oocytes declined first and then increased slowly. In both species, (a) whereas active CDC2A showed a dynamics similar to cyclin B, inactive CDC2A decreased continuously; (b) when oocytes were blocked in blocking medium containing cycloheximide, PBMP was decelerated significantly while cyclin B and active CDC2A decreasing to the lowest level; (c) whereas sodium vanadate in blocking medium reduced PBMP, epidermal growth factor (EGF) in blocking medium accelerated PBMP significantly with no effect on cyclin B levels. In conclusion, the EGF signaling cascade accelerated PBMP by promoting the pre-MPF (M-phase-promoting factor) to MPF conversion during GVBD blocking with roscovitine. The significant difference in PBMP observed between mouse and pig oocytes was caused by species difference in cyclin B dynamics during blocking culture as no species difference was observed in either pre-MPF to MPF conversion or the EGF signaling activity.
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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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Rascado TDS, Martins LR, Minto BW, de Sá Lorena S, Landim-Alvarenga FDC. Parthenogenetic development of domestic cat oocytes treated with ionomycin, cycloheximide, roscovitine and strontium. Theriogenology 2010; 74:596-601. [DOI: 10.1016/j.theriogenology.2010.03.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2009] [Revised: 12/23/2009] [Accepted: 03/14/2010] [Indexed: 11/28/2022]
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Quetglas MD, Adona PR, De Bem THC, Pires PRL, Leal CLV. Effect of Cyclin-dependent Kinase (CDK) Inhibition on Expression, Localization and Activity of Maturation Promoting Factor (MPF) and Mitogen Activated Protein Kinase (MAPK) in Bovine Oocytes. Reprod Domest Anim 2009; 45:1074-81. [DOI: 10.1111/j.1439-0531.2009.01498.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Anguita B, Paramio MT, Jiménez-Macedo AR, Morató R, Mogas T, Izquierdo D. Total RNA and protein content, Cyclin B1 expression and developmental competence of prepubertal goat oocytes. Anim Reprod Sci 2008; 103:290-303. [PMID: 17250980 DOI: 10.1016/j.anireprosci.2006.12.018] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2006] [Revised: 12/12/2006] [Accepted: 12/18/2006] [Indexed: 10/23/2022]
Abstract
The aim of this study was to examine the relationship between the developmental competence of oocytes and their total RNA and protein contents, and the level of Cyclin B1 transcription. Ovaries from prepubertal goats were collected from a slaughterhouse. Oocytes were recovered by slicing and those with two or more layers of cumulus cells and homogenous cytoplasm were matured in vitro (20-25 oocytes per drop) for 27 h. Both before and after IVM, samples of oocytes were denuded and categorised into four group treatments by diameter (<110 microm, 110-125 microm, 125-135 microm; >135 microm), separated into sub-groups of 10 oocytes per treatment-replicate and stored in liquid nitrogen until total RNA content analysis by spectophotometry, total protein content analysis by a colorimetric assay and Cyclin B1 transcription analysis by RT-PCR. For the study of developmental competence, the rest of the matured oocytes were fertilised in vitro in groups of 20-25 for 24 h. Presumptive zygotes were denuded, sorted into the four categories of diameter noted above, and placed into culture drops in groups of 18-25 for in vitro culture. Cleavage rate was evaluated at 48 hpi and embryo development at 8 d post-insemination. There were four replicates of each treatment for each assay or evaluation point of the experiment. There were no significant differences between the size categories of oocytes at collection in total RNA content, total protein content and Cyclin B1 mRNA. There were significant differences (P<0.05) in the expression of Cyclin B1 before IVM with oocytes in the >135 mm diameter category having the highest value for this variant. There were no significant differences in these characteristics between the categories of oocyte diameter after IVM except in respect of total RNA content, which was lower for the largest size of oocytes (>135 microm; mean+/-S.D.=12.3+/-1.84 ng/oocyte) than the other three size groups (19.2+/-1.38-22.1+/-4.44 ng/oocyte; P<0.05). Significant differences (P<0.05) in cleavage rate were observed between the different oocyte size categories (<110 microm, 3.0%; 110-125 microm, 32%; 125-135 microm, 50%; >135 microm, 73%). Only oocytes >125 microm diameter developed to the blastocyst stage (125-135 microm, 7%; >135 microm, 10%). This study showed that the RNA content and the Cyclin B1 RNA expression of prepubertal goat oocytes, and their development to embryos varied between the different size categories of the oocytes.
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Affiliation(s)
- Begoña Anguita
- Departament de Ciència Animal i dels Aliments, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain
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