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Tetkova A, Susor A, Kubelka M, Nemcova L, Jansova D, Dvoran M, Del Llano E, Holubcova Z, Kalous J. Follicle-stimulating hormone administration affects amino acid metabolism in mammalian oocytes†. Biol Reprod 2020; 101:719-732. [PMID: 31290535 DOI: 10.1093/biolre/ioz117] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2019] [Revised: 06/18/2019] [Accepted: 07/04/2019] [Indexed: 12/27/2022] Open
Abstract
Culture media used in assisted reproduction are commonly supplemented with gonadotropin hormones to support the nuclear and cytoplasmic maturation of in vitro matured oocytes. However, the effect of gonadotropins on protein synthesis in oocytes is yet to be fully understood. As published data have previously documented a positive in vitro effect of follicle-stimulating hormone (FSH) on cytoplasmic maturation, we exposed mouse denuded oocytes to FSH in order to evaluate the changes in global protein synthesis. We found that dose-dependent administration of FSH resulted in a decrease of methionine incorporation into de novo synthesized proteins in denuded mouse oocytes and oocytes cultured in cumulus-oocyte complexes. Similarly, FSH influenced methionine incorporation in additional mammalian species including human. Furthermore, we showed the expression of FSH-receptor protein in oocytes. We found that major translational regulators were not affected by FSH treatment; however, the amino acid uptake became impaired. We propose that the effect of FSH treatment on amino acid uptake is influenced by FSH receptor with the effect on oocyte metabolism and physiology.
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Affiliation(s)
- Anna Tetkova
- Institute of Animal Physiology and Genetics, Czech Academy of Science, Libechov, Czech Republic.,Department of Cell Biology, Faculty of Science, Charles University in Prague, Prague 2, Czech Republic
| | - Andrej Susor
- Institute of Animal Physiology and Genetics, Czech Academy of Science, Libechov, Czech Republic
| | - Michal Kubelka
- Institute of Animal Physiology and Genetics, Czech Academy of Science, Libechov, Czech Republic
| | - Lucie Nemcova
- Institute of Animal Physiology and Genetics, Czech Academy of Science, Libechov, Czech Republic
| | - Denisa Jansova
- Institute of Animal Physiology and Genetics, Czech Academy of Science, Libechov, Czech Republic
| | - Michal Dvoran
- Institute of Animal Physiology and Genetics, Czech Academy of Science, Libechov, Czech Republic.,Department of Cell Biology, Faculty of Science, Charles University in Prague, Prague 2, Czech Republic
| | - Edgar Del Llano
- Institute of Animal Physiology and Genetics, Czech Academy of Science, Libechov, Czech Republic.,Department of Cell Biology, Faculty of Science, Charles University in Prague, Prague 2, Czech Republic
| | - Zuzana Holubcova
- Department of Histology and Embryology, Faculty of Medicine, Masaryk University, Brno, Czech Republic.,Reprofit International, Clinic of Reproductive Medicine, Brno, Czech Republic
| | - Jaroslav Kalous
- Institute of Animal Physiology and Genetics, Czech Academy of Science, Libechov, Czech Republic
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2
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Zhang J, Yan L, Wang Y, Zhang S, Xu X, Dai Y, Zhao S, Li Z, Zhang Y, Xia G, Qin Y, Zhang H. In vivo and in vitro activation of dormant primordial follicles by EGF treatment in mouse and human. Clin Transl Med 2020; 10:e182. [PMID: 32997412 PMCID: PMC7520080 DOI: 10.1002/ctm2.182] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2020] [Revised: 09/09/2020] [Accepted: 09/12/2020] [Indexed: 12/25/2022] Open
Abstract
In the mammalian ovaries, dormant primordial follicles represent the reproductive reserve of individual females. Recently, stimulating the activation of primordial follicles in vitro has been practiced, making the utilization of those dormant follicles to treat female infertility possible. However, there are still lacks of effective upstream molecule and strategy to elevate follicle activation in vivo. In the current study, we revealed that growth factor EGF improved a transiently primordial follicle activation in mice by elevating the CDC42-PI3K signaling activity, and EGF treatment also improved the activation and development of human follicles in ovarian cortical pieces. Using a liquid-solid phase transition bio-gel as a carrier, an efficient in vivo activation system was established by ovarian topical EGF administration to living mice. We found that EGF treatment led to an increase of primordial follicle activation in short time but had no effect on long-term fertility in females. By establishing an inducible premature ovarian insufficiency (POI) mouse model through selectively ablating growing follicles in Zp3-Cre;iDTR mice, we further revealed that our in vivo EGF treatment system improved primordial follicle activation and ovulation of POI ovaries significantly. Taken together, our results revealed that in situ ovarian EGF administration could improve the activation of primordial follicles in living animals, and manipulating activation and development of primordial follicles in vivo might be an efficient approach to improve reproductive health in women.
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Affiliation(s)
- Jiawei Zhang
- State Key Laboratory of Agrobiotechnology, College of Biological SciencesChina Agricultural UniversityBeijing100193China
| | - Lei Yan
- Center for Reproductive MedicineShandong UniversityJinan250021China
| | - Yibo Wang
- State Key Laboratory of Agrobiotechnology, College of Biological SciencesChina Agricultural UniversityBeijing100193China
| | - Shuo Zhang
- State Key Laboratory of Agrobiotechnology, College of Biological SciencesChina Agricultural UniversityBeijing100193China
| | - Xueqiang Xu
- State Key Laboratory of Agrobiotechnology, College of Biological SciencesChina Agricultural UniversityBeijing100193China
| | - Yanli Dai
- State Key Laboratory of Agrobiotechnology, College of Biological SciencesChina Agricultural UniversityBeijing100193China
| | - Shidou Zhao
- Center for Reproductive MedicineShandong UniversityJinan250021China
| | - Zhen Li
- State Key Laboratory of Plant Physiology and Biochemistry, College of Biological SciencesChina Agricultural UniversityBeijing100193China
| | - Yan Zhang
- State Key Laboratory of Agrobiotechnology, College of Biological SciencesChina Agricultural UniversityBeijing100193China
| | - Guoliang Xia
- State Key Laboratory of Agrobiotechnology, College of Biological SciencesChina Agricultural UniversityBeijing100193China
| | - Yingying Qin
- Center for Reproductive MedicineShandong UniversityJinan250021China
| | - Hua Zhang
- State Key Laboratory of Agrobiotechnology, College of Biological SciencesChina Agricultural UniversityBeijing100193China
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3
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Kim BH, Ju WS, Kim JS, Kim SU, Park SJ, Ward SM, Lyu JH, Choo YK. Effects of Gangliosides on Spermatozoa, Oocytes, and Preimplantation Embryos. Int J Mol Sci 2019; 21:E106. [PMID: 31877897 PMCID: PMC6982094 DOI: 10.3390/ijms21010106] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2019] [Revised: 12/20/2019] [Accepted: 12/20/2019] [Indexed: 01/01/2023] Open
Abstract
Gangliosides are sialic acid-containing glycosphingolipids, which are the most abundant family of glycolipids in eukaryotes. Gangliosides have been suggested to be important lipid molecules required for the control of cellular procedures, such as cell differentiation, proliferation, and signaling. GD1a is expressed in interstitial cells during ovarian maturation in mice and exogenous GD1a is important to oocyte maturation, monospermic fertilization, and embryonic development. In this context, GM1 is known to influence signaling pathways in cells and is important in sperm-oocyte interactions and sperm maturation processes, such as capacitation. GM3 is expressed in the vertebrate oocyte cytoplasm, and exogenously added GM3 induces apoptosis and DNA injury during in vitro oocyte maturation and embryogenesis. As a consequence of this, ganglioside GT1b and GM1 decrease DNA fragmentation and act as H2O2 inhibitors on germ cells and preimplantation embryos. This review describes the functional roles of gangliosides in spermatozoa, oocytes, and early embryonic development.
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Affiliation(s)
- Bo Hyun Kim
- CHA Fertility Center, 5455 Wilshire Blvd. Los Angeles, CA 90036, USA;
| | - Won Seok Ju
- Department of Biological Science, College of Natural Sciences, Wonkwang University, 460, Iksan-daero, Iksan-si, Jeollabuk-do 54538, Korea; (W.S.J.); (S.J.P.)
| | - Ji-Su Kim
- Primate Resources Center (PRC), Korea Research Institute of Bioscience and Biotechnology, Neongme-gil, Ibam-myeon, Jeongup-si, Jeonvuk 56216, Korea;
| | - Sun-Uk Kim
- National Primate Research Center, Korea Research Institute of Bioscience and Biotechnology, 30, Yeonggudanji-ro, Ochang-eup, Cheongwon-gu, Cheongju-si, Chungcheongbuk-do 28116, Korea;
| | - Soon Ju Park
- Department of Biological Science, College of Natural Sciences, Wonkwang University, 460, Iksan-daero, Iksan-si, Jeollabuk-do 54538, Korea; (W.S.J.); (S.J.P.)
| | - Sean M. Ward
- Department of Physiology and Cell Biology, University of Nevada, Reno School of Medicine, Reno, NV 89557, USA; (S.M.W.); (J.H.L.)
| | - Ju Hyeong Lyu
- Department of Physiology and Cell Biology, University of Nevada, Reno School of Medicine, Reno, NV 89557, USA; (S.M.W.); (J.H.L.)
| | - Young-Kug Choo
- Department of Biological Science, College of Natural Sciences, Wonkwang University, 460, Iksan-daero, Iksan-si, Jeollabuk-do 54538, Korea; (W.S.J.); (S.J.P.)
- Institute for Glycoscience, Wonkwang University, 460, Iksan-daero, Iksan-si, Jeollabuk-do 54538, Korea
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Influence of Autophagy Induction after Hormone Treatment on Oocytes Maturation of Porcine. JOURNAL OF ANIMAL REPRODUCTION AND BIOTECHNOLOGY 2018. [DOI: 10.12750/jet.2018.33.4.271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
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Kim JW, Park HJ, Chae SK, Ahn JH, DO GY, Choo YK, Park JJ, Jung BD, Kim SU, Chang KT, Koo DB. Ganglioside GD1a promotes oocyte maturation, furthers preimplantation development, and increases blastocyst quality in pigs. J Reprod Dev 2016; 62:249-55. [PMID: 26860251 PMCID: PMC4919288 DOI: 10.1262/jrd.2015-083] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Gangliosides are key lipid molecules required for the regulation of cellular processes such as
proliferation, differentiation, and cell signaling, including signaling of epidermal growth factor receptor
(EGFR). Epidermal growth factor (EGF) has long been considered a potential regulator of meiotic and
cytoplasmic maturation in mammalian oocytes. However, there is no report on the direct effect of ganglioside
GD1a in porcine oocyte maturation. In this study, we first investigated a functional link between GD1a and
meiotic maturation during in vitro maturation (IVM) of porcine embryos. Moreover, we
confirmed the effect of exogenous GD1a treatment on blastocyst development, quality, and fertilization rate in
early embryonic development. First, we observed that the protein level of ST3GAL2, a GD1a synthesizing enzyme,
significantly increased (P < 0.01) in cumulus-oocyte-complexes (COCs) during IVM progress. The proportion
of arrested germinal vesicles (GV) increased in oocytes treated with EGF+GD1a (41.6 ± 1.5%) at the IVM I
stage. Upon completion of meiotic maturation, the proportion of metaphase II (M II) was significantly higher
(P < 0.05) in the EGF+GD1a (89.9 ± 3.6%) treated group. After IVF, the percentage of penetrated oocytes was
significantly higher (P < 0.05) in the EGF+GD1a (89.1 ± 2.3%) treated group than in the control group.
Furthermore, exogenous GD1a treatment improved the developmental competence and quality of blastocysts during
preimplantation embryo development stage. These results suggest that ganglioside GD1a may play an important
role in IVM mechanisms of porcine maturation capacity. Furthermore, our findings will be helpful for better
promoting the embryo development and blastocyst quality in pigs.
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Affiliation(s)
- Jin-Woo Kim
- Department of Biotechnology, College of Engineering, Daegu University, Gyeongbuk 712-714, Republic of Korea
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Mito T, Yoshioka K, Noguchi M, Yamashita S, Hoshi H. Recombinant human follicle-stimulating hormone and transforming growth factor-alpha enhance in vitro maturation of porcine oocytes. Mol Reprod Dev 2013; 80:549-60. [PMID: 23661505 DOI: 10.1002/mrd.22190] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2013] [Accepted: 05/02/2013] [Indexed: 11/11/2022]
Abstract
The biological functions of recombinant human follicle-stimulating hormone (FSH) and transforming growth factor-α (TGF-α) on in vitro maturation of porcine oocytes were investigated. Cumulus-oocyte complexes were matured in defined porcine oocyte medium containing 0-0.1 IU/ml FSH in the presence or absence of 10 ng/ml TGF-α. The percentage of oocytes reaching metaphase II was significantly higher with the addition of 0.01-0.1 IU/ml FSH compared with no addition, and was further enhanced in the presence of TGF-α. The rates of sperm penetration and blastocyst formation were significantly higher with the addition of 0.05-0.1 IU/ml FSH compared with no addition after in vitro fertilization and embryo culture. There was no beneficial effect of FSH and TGF-α on nuclear maturation of denuded oocytes. The specific EGF receptor inhibitor, AG1478, completely inhibited TGF-α-induced meiotic resumption, but did not completely prevent the stimulatory effect of FSH. Addition of both FSH and TGF-α significantly enhanced cumulus expansion compared with no addition. When cumulus expansion-related genes (HAS2, HAPLN1, and VCAN) mRNA expression in COCs was measured during in vitro maturaiton, addition of both of FSH and TGF-α upregulated the expression of HAS2 mRNA after 20 hr culture and HAPLN1 mRNA after 44 hr culture compared with no addition. Expression of VCAN mRNA was significantly higher in the presence of FSH compared with addition of TGF-α alone. These results suggest that FSH and TGF-α synergistically enhance porcine oocyte maturation via cumulus cells, and act through different signaling pathways.
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Affiliation(s)
- Tomomi Mito
- Research Institute for the Functional Peptides, Yamagata, Japan
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Celestino JJH, Bruno JB, Saraiva MVA, Rocha RMP, Brito IR, Duarte ABG, Araújo VR, Silva CMG, Matos MHT, Campello CC, Silva JRV, Figueiredo JR. Steady-state level of epidermal growth factor (EGF) mRNA and effect of EGF on in vitro culture of caprine preantral follicles. Cell Tissue Res 2011; 344:539-50. [PMID: 21503599 DOI: 10.1007/s00441-011-1162-1] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2010] [Accepted: 03/01/2011] [Indexed: 01/27/2023]
Abstract
Our aim was to verify the steady-state level of epidermal growth factor (EGF) mRNA in goat follicles at various developmental stages and to investigate the influence of EGF on the survival, antrum formation and growth of secondary follicles cultured for 6 days. Primordial, primary and secondary goat follicles and small and large antral follicles were obtained to quantify EGF mRNA by real-time reverse transcription with the polymerase chain reaction. The influence of EGF and the presence or absence of follicle-stimulating hormone (FSH) on the development of secondary follicles and on mRNA expression for EGF and FSH receptor (FSH-R) was determined after 6 days of culture. Survival, antrum formation and follicular diameter were evaluated every other day of culture. EGF mRNA levels in secondary follicles were significantly higher than those in primordial follicles, whereas in small and large antral follicles, EGF mRNA levels in cumulus-oocyte complexes (COCs) were significantly higher than in granulosa/theca cells. During culture, EGF in the presence or absence of FSH increased the follicular daily growth rate of secondary follicles when compared with that in enriched alpha minimal essential medium. FSH, EGF or both reduced EGF mRNA levels, whereas EGF reduced FSH-R mRNA levels after follicle culture for 6 days. Thus, EGF mRNA levels are higher in secondary follicles than in earlier stages, with both FSH and EGF promoting the growth of goat secondary follicles. EGF and/or FSH reduce EGF mRNA levels, whereas EGF decreases FSH-R mRNA levels, in cultured secondary follicles.
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8
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Qiao J, Feng HL. Extra- and intra-ovarian factors in polycystic ovary syndrome: impact on oocyte maturation and embryo developmental competence. Hum Reprod Update 2011; 17:17-33. [PMID: 20639519 PMCID: PMC3001338 DOI: 10.1093/humupd/dmq032] [Citation(s) in RCA: 308] [Impact Index Per Article: 23.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2010] [Revised: 06/10/2010] [Accepted: 06/18/2010] [Indexed: 12/18/2022] Open
Abstract
BACKGROUND Polycystic ovary syndrome (PCOS) is a common metabolic dysfunction and heterogeneous endocrine disorder in women of reproductive age. Although patients with PCOS are typically characterized by increased numbers of oocytes retrieved during IVF, they are often of poor quality, leading to lower fertilization, cleavage and implantation rates, and a higher miscarriage rate. METHODS For this review, we searched the database MEDLINE (1950 to January 2010) and Google for all full texts and/or abstract articles published in English with content related to oocyte maturation and embryo developmental competence. RESULTS The search showed that alteration of many factors may directly or indirectly impair the competence of maturating oocytes through endocrine and local paracrine/autocrine actions, resulting in a lower pregnancy rate in patients with PCOS. The extra-ovarian factors identified included gonadotrophins, hyperandrogenemia and hyperinsulinemia, although intra-ovarian factors included members of the epidermal, fibroblast, insulin-like and neurotrophin families of growth factors, as well as the cytokines. CONCLUSIONS Any abnormality in the extra- and/or intra-ovarian factors may negatively affect the granulosa cell-oocyte interaction, oocyte maturation and potential embryonic developmental competence, contributing to unsuccessful outcomes for patients with PCOS who are undergoing assisted reproduction.
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Affiliation(s)
- Jie Qiao
- Department of Obstetrics and Gynecology, Peking University Third Hospital, Beijing 100083, People's Republic of China
| | - Huai L. Feng
- Department of Obstetrics and Gynecology, North Shore University Hospital, NYU School of Medicine, Manhasset, NY 11030, USA
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Uhm S, Gupta M, Yang J, Chung HJ, Min T, Lee H. Epidermal growth factor can be used in lieu of follicle-stimulating hormone for nuclear maturation of porcine oocytes in vitro. Theriogenology 2010; 73:1024-36. [DOI: 10.1016/j.theriogenology.2009.11.029] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2009] [Revised: 11/10/2009] [Accepted: 11/16/2009] [Indexed: 10/19/2022]
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10
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Mito T, Yoshioka K, Nagano M, Suzuki C, Yamashita S, Hoshi H. Transforming growth factor-α in a defined medium during in vitro maturation of porcine oocytes improves their developmental competence and intracellular ultrastructure. Theriogenology 2009; 72:841-50. [DOI: 10.1016/j.theriogenology.2009.06.004] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2009] [Revised: 05/28/2009] [Accepted: 06/03/2009] [Indexed: 11/26/2022]
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11
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Hsieh M, Zamah AM, Conti M. Epidermal growth factor-like growth factors in the follicular fluid: role in oocyte development and maturation. Semin Reprod Med 2009; 27:52-61. [PMID: 19197805 DOI: 10.1055/s-0028-1108010] [Citation(s) in RCA: 81] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
The growth and maturation of the ovarian follicle requires the coordinate function of somatic cells and the oocyte. Over the past three decades, numerous growth factors involved in the bidirectional signals between the somatic and germ cells have been identified. A possible function of epidermal growth factor (EGF) signaling at selected stages of follicle maturation had been proposed early on and is supported by many observations of in vitro effects of this growth factor on steroidogenesis, oocyte maturation, and cumulus expansion. However, attempts to link EGF levels in the follicular fluid with the state of follicle and oocyte maturation have been inconclusive. More recently, data generated using mouse genetic models perturbing ovulation and fertility indicate that EGF-like growth factors, rather than EGF itself, accumulate in the follicle at the time of ovulation. EGF-like growth factor mRNA is regulated by the luteinizing hormone surge, and corresponding proteins are detected in the follicle. The EGF-like growth factors amphiregulin, epiregulin, and betacellulin are potent stimulators of oocyte maturation and cumulus expansion, and perturbation of this EGF network in vivo impairs ovulation. Similar findings in species other than the mouse confirm an important physiological role for this network at the time of ovulation. Whether this network also plays a critical role in humans and whether it can be used as a biological marker of follicle development or for the improvement of fertility remains to be determined. This review summarizes the most recent findings on the EGF network during ovulation and the potential clinical applications of manipulating this intercellular communication pathway in the control of fertility.
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Affiliation(s)
- Minnie Hsieh
- Department of Obstetrics, Gynecology and Reproductive Sciences, Center for Reproductive Sciences, University of California, San Francisco, California 94143-0556, USA
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12
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Li M, Liang CG, Xiong B, Xu BZ, Lin SL, Hou Y, Chen DY, Schatten H, Sun QY. PI3-kinase and mitogen-activated protein kinase in cumulus cells mediate EGF-induced meiotic resumption of porcine oocyte. Domest Anim Endocrinol 2008; 34:360-71. [PMID: 18023131 DOI: 10.1016/j.domaniend.2007.10.001] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/26/2007] [Revised: 10/03/2007] [Accepted: 10/04/2007] [Indexed: 10/22/2022]
Abstract
Previous studies have shown that epidermal growth factor (EGF) has the ability to promote in vitro cultured porcine oocyte maturation. However, little is known about the detailed downstream events in EGF-induced meiotic resumption. We designed this study to determine the relationship of EGF, EGFR, phosphatidylinositol 3-kinase (PI3-kinase), MAPK, and germinal vesicle breakdown (GVBD) during oocyte maturation. Our results showed that GVBD in cumulus-enclosed oocytes (CEOs) but not in denuded oocytes (DOs) was induced by EGF in a dose-dependent manner, which indicated that cumulus cells but not oocyte itself were the main target for EGF-induced meiotic resumption. Furthermore, we found that MAPK in cumulus cells rather than in oocyte was activated immediately after EGF administration. To explore whether EGF exerts its functions through MAPK pathway, the activities of EGF receptor (EGFR) and MAPK were inhibited by employing AG1478 and U0126, respectively. Inhibition of MAPK blocked EGF-induced GVBD, whereas inhibition of EGFR prevented MAPK activation. Both AG1478 and U0126 could lead to the failure of EGF-induced GVBD singly. Notably, we found that LY294002, a specific inhibitor of PI3-kinase, effectively inhibited EGF-induced MAPK activation as well as subsequent oocyte meiotic resumption and this inhibition could not be reversed by adding additional EGF. Thus, PI3-kinase-induced MAPK activation in cumulus cells mediated EGF-induced meiotic resumption in porcine CEOs. Together, this study provides evidences demonstrating a linear relationship of EGF/EGFR, PI3-kinase, MAPK and GVBD and presents a relatively definitive mechanism of EGF-induced meiotic resumption of porcine oocyte.
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Affiliation(s)
- Mo Li
- State Key Laboratory of Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Da Tun Road, Chaoyang, Beijing 100101, PR China
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13
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Samartzi F, Tsakmakidis I, Theodosiadou E, Vainas E. Effect of porcine and ovine FSH on nuclear maturation of pig oocytes in vitro. Reprod Domest Anim 2008; 43:153-6. [PMID: 18325004 DOI: 10.1111/j.1439-0531.2007.00868.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The effect of porcine or ovine FSH on the maturation rate of porcine oocytes and on the time course of meiotic progression was studied. Groups of 20 grade-A cumulus oocyte complexes, aspirated from slaughterhouse cycling-gilt ovaries, were cultured in vitro in 400 mul of Modified Parker's Medium supplemented with oestrous cow serum and porcine FSH (Folltropin(R)-V, 0.50 mg/ml) or ovine FSH (Ovagen(TM), 0.44 iu/ml), in four-well dishes under mineral oil, at 38.5 degrees C, 5% CO(2) in humidified air. At the end of each 3-h interval, from 3 to 42 h of culture, the nuclear status of oocytes was assessed microscopically (1000x), after fixation (methanol/acetic acid: 3/1) and orcein (2%) staining. Oocytes were classified as (i) immature (IMM), i.e. oocytes at germinal vesicle stage, germinal vesicle break down and prophase I, (ii) metaphase I (MI) and (iii) metaphase II (MII), i.e. oocytes at anaphase I, telophase I and metaphase II. Data were analysed using regression analysis, chi-square and t-test. Nuclear status was assessed in 1610 oocytes (porcine FSH: 787, ovine FSH: 823). Most of the oocytes were at MI from 24 to 33 h (porcine FSH 60.27%, ovine FSH 42.80%, p < 0.001) and at MII from 36 to 42 h (porcine FSH 80.38%, ovine FSH 67.45%, p < 0.01) of culture. Significantly higher maturation rate was observed in porcine FSH than in ovine FSH treated oocytes (86.69 +/- 12.97%, 71.34 +/- 9.86%, mean +/- SD, p < 0.05), after 42 h of culture. In conclusion, under the specific culture conditions, porcine FSH seems to support pig oocyte maturation better than ovine FSH.
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Affiliation(s)
- F Samartzi
- National Agricultural Research Foundation, Veterinary Research Institute, Thessaloniki, Greece.
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14
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Krisher RL, Brad AM, Herrick JR, Sparman ML, Swain JE. A comparative analysis of metabolism and viability in porcine oocytes during in vitro maturation. Anim Reprod Sci 2007; 98:72-96. [PMID: 17110061 DOI: 10.1016/j.anireprosci.2006.10.006] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The importance of oocyte quality cannot be overstated, because it impacts all subsequent events during development of the embryo, the fetus and even the resulting offspring. Oocyte metabolism plays a critical role in supporting developmental competence via multiple mechanisms. It is beginning to be understood that metabolic pathways not only affect cytoplasmic maturation but may control nuclear maturation as well. A complete understanding of the precise roles that metabolism plays in determining oocyte quality is crucial for developing efficient in vitro maturation systems to support acquisition of oocyte competence. To date, this pursuit has not been entirely successful. Work in our laboratory on porcine oocyte metabolism has elucidated some of the intricate control mechanisms at work within the oocyte, not only for energy production, but also encompassing progression of nuclear maturation, mitochondrial activity and distribution, and oxidative and ionic stresses. We hypothesize that by utilizing oocyte metabolic data, we can develop more appropriate in vitro maturation systems that result in increased oocyte and embryo developmental competence.
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Affiliation(s)
- R L Krisher
- Department of Animal Sciences, 915 West State Street, Purdue University, West Lafayette, IN 47907-2054, USA.
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15
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Schoevers EJ, Colenbrander B, Roelen BAJ. Developmental stage of the oocyte during antral follicle growth and cumulus investment determines in vitro embryo development of sow oocytes. Theriogenology 2007; 67:1108-22. [PMID: 17289139 DOI: 10.1016/j.theriogenology.2006.12.009] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2006] [Revised: 12/22/2006] [Accepted: 12/30/2006] [Indexed: 11/24/2022]
Abstract
The aim of the study was to determine the contribution of cumulus cells on the developmental competence of porcine oocytes during follicle growth. Oocytes from large (5-8mm) and small (2-3mm) follicles were cultured with or without follicle stimulating hormone (FSH), subsequently examined for nuclear stage and spindle morphology, or fertilized and cultured for embryo development, or analyzed for glutathione content. Additionally, the significance of cumulus investment, corona radiata cells, cumulus cell number and origin of cumulus cells for oocyte maturation were investigated. Small follicle oocytes cultured without FSH exhibited the highest incidence of spindle aberrations. Oocytes cultured without FSH exhibited reduced sperm penetration and blastocyst rates, and a higher proportion monospermic oocytes developed to the blastocyst stage when derived from large follicles. The glutathione content in oocytes increased during follicle growth and oocyte maturation, but no direct correlation between oocyte glutathione content and oocyte developmental capacity was observed. Oocytes with a bigger cumulus investment exhibited better embryo development. Oocytes with a single corona radiata cell layer (CROs) exhibited similar progression through meiosis to oocytes with more cumulus cell layers, but showed reduced embryo development. More blastocysts were observed when CROs were cultured with disconnected cumulus cells during IVM, but no blastocyst increase was observed when CROs were cocultured with a higher number of cumulus cells or with cumulus cells from large follicles. We conclude that increased developmental capacity of oocytes during follicle growth is intrinsic and whether cumulus cells originate from large or small follicles, their contribution to oocyte maturation remains unchanged. Further, cumulus investment can be used as a variable to predict oocyte developmental capacity.
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Affiliation(s)
- E J Schoevers
- Department of Farm Animal Health, Faculty of Veterinary Medicine, Utrecht University, Yalelaan 7, 3584 CL Utrecht, The Netherlands.
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16
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Gall L, Boulesteix C, Ruffini S, Germain G. EGF-induced EGF-receptor and MAP kinase phosphorylation in goat cumulus cells during in vitro maturation. Mol Reprod Dev 2006; 71:489-94. [PMID: 15858794 DOI: 10.1002/mrd.20317] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
EGF has been shown to influence meiotic maturation and development competence of oocyte in various mammalian species. We previously reported, in goat, that the EGF receptor (EGF-R) was present both on cumulus cells and oocytes. Here, EGF-induced signaling was investigated during the in vitro maturation process in goat cumulus-oocyte complexes (COCs). Cumulus cells and oocytes were subjected to Western immunoblotting analysis using anti-MAP kinase, anti-phosphotyrosine, anti-phospho MAP kinase, and anti-phospho EGF-R antibodies. We demonstrated that treatment with EGF during the in vitro maturation process induced rapid tyrosine phosphorylation of EGF-R in a time and concentration dependent manner in cumulus cells. A similar pattern of activation by phosphorylation was observed for MAP kinase upon EGF stimulation. AG 1478, an inhibitor of the EGF kinase, suppressed EGF-stimulated phosphorylation of EGF-R and also affected the MAP kinase activation. Treatment with the MEK inhibitor PD 98059 abolished EGF-induced MAP kinase activation. We did not observe oocyte EGF-R phosphorylation in our experiments during the in vitro maturation process. Our data indicate, in goat cumulus cells, that activation of EGF-R by EGF triggers signaling through the MAP kinase pathway during in vitro maturation. This supports the hypothesis that the major site of action for EGF, that regulates oocyte maturation, is the cumulus cell.
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Affiliation(s)
- Laurence Gall
- Unité Biologie du Developpement et de la Reproduction, INRA, Jouy-en-Josas, France.
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17
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Silva JRV, van den Hurk R, Figueiredo JR. Expression of mRNA and protein localization of epidermal growth factor and its receptor in goat ovaries. ZYGOTE 2006; 14:107-17. [PMID: 16719946 DOI: 10.1017/s0967199406003650] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2005] [Accepted: 10/01/2005] [Indexed: 11/07/2022]
Abstract
SummaryTo examine the possibility that epidermal growth factor (EGF) and its receptor (EGF-R) are expressed throughout folliculogenesis, we studied the presence and distribution of EGF and EGF-R in goat ovaries. Ovaries of goats were collected and either fixed in paraformaldehyde for immunohistochemical localization of proteins, or used for the isolation of follicles, luteal cells and ovarian surface epithelium to study mRNA expression for EGF and EGF-R, using the reverse transcriptase polymerase chain reaction. EGF protein and mRNA were found in primordial, primary and secondary follicles as well as in small and large antral follicles and in surface epithelium, but in corpora lutea only the protein could be detected. Antral follicles expressed EGF mRNA in oocyte, cumulus, mural granulosa and theca cells. For EGF-R, both protein and mRNA were present at all stages of follicular development and in all antral follicular compartments. EGF-R protein and mRNA were also found in corpora lutea and surface epithelium. It is concluded that EGF and its receptor are expressed in goat ovarian follicles at all stages of follicle development, in corpora lutea, and in ovarian surface epithelium.
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Affiliation(s)
- José R V Silva
- Department of Farm Animal Health, Faculty of Veterinary Medicine, Utrecht University, Utrecht, The Netherlands
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18
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Ye J, Campbell KHS, Craigon J, Luck MR. Dynamic Changes in Meiotic Progression and Improvement of Developmental Competence of Pig Oocytes in Vitro by Follicle-Stimulating Hormone and Cycloheximide1. Biol Reprod 2005; 72:399-406. [PMID: 15456703 DOI: 10.1095/biolreprod.104.034553] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
Abstract
The effects of FSH, LH, and epidermal growth factor (EGF) on the dynamics of nuclear maturation and subsequent embryo development were examined in pig oocytes cultured either conventionally or after preincubation with cycloheximide (CHX). In conventional culture, FSH or EGF significantly increased the rate of attainment of metaphase II (MII) for both gilt (50.0%+/-4.2% and 54.8%+/-4.3%, respectively; control, 5.8%+/-1.8%; P<0.001) and sow (87.6%+/-3.4% and 78.8%+/-3.9%, respectively; control, 7.8%+/-2.5%; P<0.001) oocytes. Gilt oocytes treated with both FSH and EGF showed an additive response (93.7%+/-2.1%). Treatment with LH had no effect. Preincubation with CHX caused the majority (84-100%) of both gilt and sow oocytes to undergo germinal vesicle breakdown. Compared to those treated with LH and/or EGF (both>80%), fewer FSH-treated oocytes reached metaphase I (43.8%+/-5.3%, P<0.001) by 14 h and MII (48.4%+/-5.9%, P<0.001) by 24 h, although the majority (71%) did mature to MII by 36 h after removal of CHX. After in vitro fertilization, higher proportions of both CHX-pretreated and untreated, FSH-exposed oocytes cleaved (71.3%+/-2.9% and 75.3%+/-3.1%, respectively) compared with those not treated with FSH (37.7%+/-3.0% and 43.0%+/-2.9%, respectively; P<0.001). Pretreatment with CHX significantly increased blastocyst yield for both FSH-treated (32.8%+/-2.0% and 10.3%+/-1.5%, respectively; P<0.001) and untreated (16.7%+/-1.5% and 9.4%+/-1.2%, respectively; P<0.001) oocytes. Polyspermy rates were unaffected. In conclusion, pig oocytes meiotically arrested by CHX before maturation retain and improve their developmental competence. FSH stimulates nuclear maturation but slows meiotic progression.
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Affiliation(s)
- J Ye
- Division of Animal Physiology, School of Biosciences, University of Nottingham, Sutton Bonington Campus, Loughborough LE12 5RD, United Kingdom
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19
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Hong JY, Yong HY, Lee BC, Hwang WS, Lim JM, Lee ES. Effects of amino acids on maturation, fertilization and embryo development of pig follicular oocytes in two IVM media. Theriogenology 2004; 62:1473-82. [PMID: 15451256 DOI: 10.1016/j.theriogenology.2004.02.013] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2003] [Revised: 11/11/2003] [Accepted: 02/19/2004] [Indexed: 10/26/2022]
Abstract
This study was conducted to develop a serum-free, defined medium for IVM of pig oocytes. Modified North Carolina State University (mNCSU)-23 media with or without supplementation with both epidermal growth factor (EGF) and gonadotrophin were used as base media. In separate experiments, each base medium was supplemented with porcine follicular fluid (pFF), polyvinyl alcohol (PVA), PVA and essential amino acids (EAA), PVA and nonessential amino acids (NEAA) or PVA with both EAA and NEAA. Averaged across these five treatments, the percentage of blastocyst formation was higher (P < 0.05) in the base medium supplemented with EGF and gonadotrophins. In both base media, the addition of NEAA yielded similar percentages of maturation (81-82% versus 75-80%), sperm penetration (89-93% versus 80-86%) and blastocyst formation (4-18% versus 4-13%) as media supplemented with pFF. Although similar benefits were found after the addition of EAA, their addition was associated with lower (P < 0.05) maturation (66%) and sperm penetration (58%) than when pFF was added to the base medium without EGF and gonadotrophins. However, decreased maturation after EAA addition was not detected in the base medium containing EGF and gonadotrophins. Within the same base medium, monospermy, male pronucleus formation, cleavage and blastocyst formation were not affected by the treatments; and combined addition of EAA and NEAA did not further improve oocyte development. In conclusion, a maturation system using a defined mNCSU-23 medium supplemented with EGF, gonadotrophins and EAA or NEAA was developed which yielded a similar number of blastocysts compared with a pFF-containing medium.
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Affiliation(s)
- J Y Hong
- Department of Veterinary Medicine, Kangwon National University, Chunchon 200-701, South Korea
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20
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Roberts R, Stark J, Iatropoulou A, Becker DL, Franks S, Hardy K. Energy Substrate Metabolism of Mouse Cumulus-Oocyte Complexes: Response to Follicle-Stimulating Hormone Is Mediated by the Phosphatidylinositol 3-Kinase Pathway and Is Associated with Oocyte Maturation1. Biol Reprod 2004; 71:199-209. [PMID: 15028625 DOI: 10.1095/biolreprod.103.023549] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
Abstract
Successful in vitro maturation (IVM) of oocytes obtained from medium-sized antral follicles could avoid the need for superovulation for in vitro fertilization. The wide range of doses of FSH used in IVM prompted us to study the effect of varying concentrations of FSH on the dynamics of nutrient uptake and production by individual maturing mouse cumulus-oocyte complexes (COCs). COCs isolated from the antral follicles of unprimed, prepubertal B6CBF(1) mice were cultured individually in increasing concentrations of FSH (0-2000 ng/ml). Following culture, pyruvate, glucose, and lactate uptake or production by individual complexes were noninvasively assessed and compared with the stage of nuclear maturation of the enclosed oocyte. FSH significantly increased oocyte maturation and produced a two- to threefold increase in glucose uptake and lactate production by COCs in which the enclosed oocyte completed maturation. In these COCs, pyruvate was taken up under control conditions but was produced in progressively higher quantities in increasing concentrations of FSH. In COCs where the oocyte failed to complete maturation, pyruvate was taken up (rather than produced) and glucose uptake and lactate production were lower and unaffected by the presence or absence of FSH. This suggests that there is dialogue between cumulus cells and the maturing oocyte that influences FSH responsiveness and substrate metabolism of the whole COC. Finally, inhibition of FSH-stimulated glucose uptake by the PI3-kinase inhibitor LY294002 and the finding of GLUT4 protein in granulosa cells suggest that FSH increases glucose uptake by PI3-kinase-mediated translocation of GLUT4 to the granulosa cell membrane.
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Affiliation(s)
- Ruth Roberts
- Institute of Reproductive and Developmental Biology, Imperial College London, Hammersmith Hospital, London W12 0NN, United Kingdom
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21
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Gall L, Chene N, Dahirel M, Ruffini S, Boulesteix C. Expression of epidermal growth factor receptor in the goat cumulus-oocyte complex. Mol Reprod Dev 2004; 67:439-45. [PMID: 14991735 DOI: 10.1002/mrd.20040] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
It has been previously reported that epidermal growth factor (EGF) influences meiotic maturation and development competence of oocytes in various mammalian species. The present study was undertaken to analyze the expression of the gene encoding the EGF-receptor (EGF-R) in the goat cumulus-oocyte complex during meiotic competence acquisition. Expression of EGF-R mRNA was evaluated by PCR on reverse transcribed mRNA from follicular cells and oocytes, using EGF-R specific primers designed from human cDNA. The presence of the EGF-R transcript was evidenced in follicular cells as well as in meiotically competent and incompetent oocytes. Western blot analysis performed with specific anti EGF-R antibody revealed in meiotically competent and incompetent oocytes and in follicular cells a 170 kD polypeptide corresponding to the goat EGF-R protein. In oocytes the amount of EGF-R increased with meiotic competence acquisition. EGF-R distribution was examined by indirect immunofluorescence on frozen sections of cumulus-oocyte complexes (COCs). EGF-R immunoreactivity was observed in cumulus cells and in oocytes. Staining appeared to be confined to the periphery of the cells for both oocytes and cumulus cells. In this study, we identified the main component required for signaling via EGF-R in the goat oocyte and in follicular cells. These results suggest a possible involvement of EGF in the regulation of follicular growth and oocyte maturation in goat.
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Affiliation(s)
- Laurence Gall
- Unité de Biologie du Développement et de la Reproduction, INRA, Jouy-en-Josas, France.
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22
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Schoevers EJ, Kidson A, Verheijden JHM, Bevers MM. Effect of follicle-stimulating hormone on nuclear and cytoplasmic maturation of sow oocytes in vitro. Theriogenology 2003; 59:2017-28. [PMID: 12600737 DOI: 10.1016/s0093-691x(02)01288-8] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
A series of experiments were conducted to evaluate the effects of FSH supplementation during IVM on porcine oocyte nuclear maturation, and subsequent fertilization, cleavage and embryo development. Cumulus-oocyte complexes (COCs) were cultured 40 h without FSH (control), 40 h with FSH (FSH 0-40 h), or 20 h with FSH followed by a 20-h culture period without FSH (FSH 0-20 h). Nuclear stage of oocytes was assessed at intervals from 12 to 40 h of IVM. Furthermore, oocytes were in vitro fertilized, fixed and stained to determine normally fertilized and polyspermic oocytes. Additionally, COCs were matured with FSH, fertilized and zygotes cultured in NCSU-23. The percentage of cleaved embryos and blastocysts were determined and the number of nuclei was counted. The presence of FSH during the first 20 h of IVM retarded germinal vesicle breakdown. After 40 h of culture 84, 67 and 58% MII oocytes were observed in the FSH 0-20 h, FSH 0-40 h and control groups, respectively. After IVF, penetration rates were similar at 27, 26 and 29%, while the proportion of polyspermic oocytes was 7, 19 and 11% of penetrated oocytes for control, FSH 0-40 and FSH 0-20 h groups, respectively. Cleavage and blastocyst rates differed among treatments (21, 29 and 38%, and 7, 15 and 20% for control, FSH 0-40 and FSH 0-20 h groups, respectively). No differences in blastocyst cell number were found among groups. Blastocyst rates, based on number of cleaved embryos, were 51 and 52% for the FSH 0-40 and FSH 0-20 h groups, which differed significantly from the control group (31%). The results indicate that FSH has a stimulatory effect on nuclear and cytoplasmic maturation of sow oocytes. Addition of FSH for the first 20 h of culture was most beneficial, based on cleavage and blastocyst development rates.
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Affiliation(s)
- E J Schoevers
- Department of Farm Animal Health, Faculty of Veterinary Medicine, Utrecht University, Yalelaan 7, Utrecht, The Netherlands.
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23
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Sun QY, Nagai T. Molecular Mechanisms Underlying Pig Oocyte Maturation and Fertilization. J Reprod Dev 2003; 49:347-59. [PMID: 14967910 DOI: 10.1262/jrd.49.347] [Citation(s) in RCA: 72] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Since the pig is not only an important farm animal, but also a model animal for biomedical applications, the development of reproductive technologies in this species has been very important. In vitro oocyte maturation and fertilization (IVM-IVF) are basic techniques for a number of oocyte- or embryo-related technologies. The practical aspects for pig oocyte IVM-IVF have been reviewed, while the molecular mechanisms underlying oocyte meiotic maturation and fertilization have not been well summarized, although accumulating data have been obtained in recent one decade. This review will focus on what is known about the molecular mechanisms of porcine oocyte maturation and fertilization such as first meiosis resumption, meiotic spindle assembly, second meiosis metaphase (MII) arrest during oocyte maturation, sperm-egg recognition and fusion, sperm acrosome reaction, second meiosis resumption, sperm chromatin decondensation, and pronucleus formation during fertilization, as well as the establishment of polyspermy block.
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Affiliation(s)
- Qing-Yuan Sun
- Developmental Biology Department, National Institute of Agrobiological Sciences, Kannondai 2-1-2, Tsukuba, Ibaraki 305-8602, Japan
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24
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Bogliolo L, Leoni G, Ledda S, Naitana S, Zedda M, Carluccio A, Pau S. Intracytoplasmic sperm injection of in vitro matured oocytes of domestic cats with frozen-thawed epididymal spermatozoa. Theriogenology 2001; 56:955-67. [PMID: 11665895 DOI: 10.1016/s0093-691x(01)00621-5] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
The ability to mature and fertilize oocytes of endangered species may allow us to sustain genetic and global biodiversity. The first objective of this study was to compare the effect of two different culture media and two different incubation times on in vitro maturation (IVM) of domestic cat oocytes. The second objective was to determine the developmental competence of in vitro matured cat oocytes after intracytoplasmic sperm injection (ICSI) with cat spermatozoa. Oocytes recovered from ovaries of ovariectomized cats were cultured either in TCM 199 medium or in synthetic oviductal fluid (SOF), both of which were supplemented with cysteamine, BSA, FSH, LH. Nuclear maturation was assessed after 24 h and 40 h of incubation. Results of IVM showed that the percentage of oocytes reaching MII after 24 h and 40 h of incubation were significantly higher (P<0.001) after culture with SOF (88/110, 80% and 159/192, 82.8%) than TCM 199 (86/129, 66.7% and 58/90, 64.4%). Oocytes (n = 231) matured in vitro in SOF for 24 h were fertilized by ICSI with frozen-thawed epididymal cat spermatozoa. After ICSI, one group of oocytes (n = 129) was activated with ethanol, and a second group (n = 102) was not activated. The developmental competence of all ICSI oocytes was examined after 7 days of in vitro culture. After 28 h of culture, the cleavage frequency of ICSI-activated oocytes was significantly higher (P<0.001) than that of IC
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Affiliation(s)
- L Bogliolo
- Obstetrics Section of the Institute of General Pathology, Pathological Anatomy and Veterinary Obstetrics-Surgery Clinic, University of Sassari, Italy.
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25
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Marchal R, Feugang JM, Perreau C, Venturi E, Terqui M, Mermillod P. Meiotic and developmental competence of prepubertal and adult swine oocytes. Theriogenology 2001; 56:17-29. [PMID: 11467513 DOI: 10.1016/s0093-691x(01)00539-8] [Citation(s) in RCA: 123] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
The present study was conducted to compare meiotic and cytoplasmic competence of prepubertal and adult porcine oocytes, and the effects of EGF (0 to 100 ng/mL), FSH (0 to 400 ng/mL) and prepubertal pFF (0 to 10%) on nuclear maturation. Prepubertal oocytes were less responsive to FSH and pFF than were adult oocytes in terms of stimulation of nuclear maturation. The best nuclear maturation rates for prepubertal oocytes were obtained with 10 ng/mL EGF and 400 ng/mL FSH, whereas for adult oocytes no additional effect of EGF was seen in the presence of 400 ng/mL FSH. Supplementation with pFF had no additional effect on MII yield over that obtained with EGF plus FSH. After maturation in the presence of EGF, FSH and cysteamine, fertilization rates were not different between adult and prepubertal oocytes, but polyspermy was more frequent in prepubertal oocytes (31 +/- 17% vs. 17 +/- 7% in prepubertal and adult oocytes, respectively, P < 0.05). The addition of pFF to maturation medium decreased oocyte fertilization of adult oocytes and polyspermic fertilization in prepubertal oocytes. Blastocyst yield and developmental competence were significantly reduced in prepubertal oocytes compared to adult oocytes. The mean cell numbers in blastocysts cultured for 7 days ranged from 61 to 74, and did not differ among groups. Finally, the viability of the 2- to 4-cell embryos and blastocysts produced was assessed by embryo transfer experiments. One offspring was obtained after transfer of 2- to 4-cell embryos, and one after transfer of in vitro-produced blastocysts. In conclusion, although prepubertal gilt oocytes appeared less meiotically and developmentally competent than their adult counterparts, they can be used to produce blastocysts able to develop to term.
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Affiliation(s)
- R Marchal
- Station de Physiologie de la Reproduction et des Comportements, INRA, Nouzilly, France
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26
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Lorenzo PL, Liu IKM, Illera JC, Picazo RA, Carneiro GF, Illera MJ, Conley AJ, Enders AC, Illera M. Influence of epidermal growth factor on mammalian oocyte maturation via tyrosine-kinase pathway. J Physiol Biochem 2001. [DOI: 10.1007/bf03179809] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Qu J, Nisolle M, Donnez J. Expression of transforming growth factor-alpha, epidermal growth factor, and epidermal growth factor receptor in follicles of human ovarian tissue before and after cryopreservation. Fertil Steril 2000; 74:113-21. [PMID: 10899507 DOI: 10.1016/s0015-0282(00)00549-5] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
OBJECTIVE To study the expression of transforming growth factor-alpha (TGF-alpha), epidermal growth factor (EGF), and EGF receptor in follicles of human ovarian tissue. DESIGN A retrospective, controlled comparative study. SETTING In vitro fertilization laboratory of a university hospital. PATIENT(S) Fifteen women with regular menstrual cycles who underwent laparoscopy and the biopsy of ovarian tissue. INTERVENTION(S) Paraffin sections were prepared from ovarian tissues, followed by immunohistochemical staining of TGF-alpha, EGF, and EGF receptor. MAIN OUTCOME MEASURE(S) Immunostaining for TGF-alpha, EGF, and EGF receptor in follicles of fresh and frozen ovarian tissues. RESULT(S) Immunoreactivities for TGF-alpha and EGF receptor were observed simultaneously in the oocytes of primordial, primary, preantral, and antral follicles. Strong staining for TGF-alpha and EGF receptor was present in thecal cells. The TGF-alpha and EGF receptor was also expressed in some granulosa cells of primary to antral follicles. The EGF only stained weakly in the oocytes of primordial and primary follicles and in thecal cells. There was no difference in staining patterns for TGF-alpha, EGF, and EGF receptor between fresh and frozen ovarian tissues. CONCLUSION(S) The TGF-alpha and EGF receptor was expressed in primordial to antral follicles, indicating a role of TGF-alpha in regulating follicular development through binding to the EGF receptor. Freeze-thawing did not substantially alter immunoreactivites for TGF-alpha, EGF, and EGF receptor in frozen ovarian tissue.
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Affiliation(s)
- J Qu
- Department of Gynaecology, Hospital of Saint Luc, Catholic University of Louvain, Brussels, Belgium
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28
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Abstract
Current methods for detecting complete oocyte maturation and developmental competence are inadequate. The objectives of this study were to (1) examine the relationship between cat oocyte energy metabolism and development in vitro after fertilization and (2) determine if cumulus cell metabolism could be used to predict development of individual oocytes after fertilization in vitro. The hanging drop method was used to assess metabolism of three different types of cat oocytes: immature (IMO), in vitro matured (IVM), and in vivo matured (IVOM). Stage of oocyte nuclear maturation or developmental competence was assessed after metabolic analysis. Glycolysis and oxidation of glucose, glutamine, palmitate, and lactate increased with the resumption of oocyte meiotic maturation (P<0.05). Pyruvate was the preferred substrate, but uptake was not linked to maturation. IVM oocytes had impaired glucose and palmitate metabolism compared to IVOM oocytes (P<0.05). Oocyte glycolytic activity and oocyte glucose oxidation correlated well with embryo development after insemination in vitro (P<0.05). Furthermore, oocytes that had similar glucose metabolism and that were grouped together for culture on this basis had higher (P<0.05) overall rates of development than oocytes grouped randomly. There was no correlation (P>0.05) between cumulus cell metabolism and individual oocyte development after in vitro fertilization. The data reveal that energy metabolism is linked to oocyte maturation in the cat and that glucose metabolic activity can indicate those oocytes most likely to fertilize and develop in vitro. Measuring cumulus cell metabolism does not accurately predict individual oocyte development after insemination in vitro.
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Affiliation(s)
- R E Spindler
- Conservation & Research Center, National Zoological Park, Smithsonian Institution, Front Royal, Virginia 22630, USA.
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29
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Procházka R, Srsen V, Nagyová E, Miyano T, Flechon JE. Developmental regulation of effect of epidermal growth factor on porcine oocyte-cumulus cell complexes: nuclear maturation, expansion, and F-actin remodeling. Mol Reprod Dev 2000; 56:63-73. [PMID: 10737968 DOI: 10.1002/(sici)1098-2795(200005)56:1<63::aid-mrd8>3.0.co;2-d] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Epidermal growth factor (EGF) efficiently stimulates expansion of mouse and rat oocyte-cumulus complexes (OCC). Contradictory data have been published by several laboratories about the ability of EGF to stimulate expansion of porcine OCC. We assumed that these contradictions may have resulted from heterogeneous conditions used for isolation, culture, and assessment of OCC. The present experiments were designed to test the hypothesis that porcine OCC acquire the ability to synthesize hyaluronic acid (HA) and undergo expansion following EGF-stimulation gradually during the growth of follicles. For this reason, we isolated OCC from follicles of different sizes and assessed quantity of produced HA and proportions of expanding OCC after stimulation by EGF. In addition, we assessed in those OCC changes in morphology of cumulus cells and assembly of F-actin microfilaments, which are necessary for expansion to occur. Finally, nuclear maturation of EGF-stimulated OCC was assessed and its relationship with occurrence of expansion was evaluated. In all experiments, OCC stimulated with FSH were used as positive controls. The results showed that EGF did not stimulate production of HA, rearrangement of F-actin and expansion in OCC isolated from small follicles (<4 mm in diameter). OCC isolated from large preovulatory follicles (6-7 mm in diameter and PMSG-stimulated follicles) underwent efficient expansion when stimulated by EGF (93% and 100%, respectively). EGF dramatically stimulated total production of HA in these OCC and its retention in extracellular matrix of the expanding cumulus. Cumulus cells of the large OCC underwent essential changes of their morphology and extensive rearrangement of F-actin microfilaments following stimulation with EGF. Interestingly, EGF enhanced nuclear maturation of OCC isolated from both small and large follicles, which suggest diversity of signaling pathways controlling maturation and expansion. FSH caused cumulus expansion, F-actin remodeling, and enhancement of oocyte nuclear maturation in OCC originated from both small and large follicles. We conclude that EGF can stimulate expansion of porcine OCC in vitro; however, only of those isolated from large follicles. This indicates that EGF may have a physiological role in regulation of porcine cumulus expansion in preovulatory follicles, presumably as a mediator of signals elicited by the LH surge.
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Affiliation(s)
- R Procházka
- Academy of Sciences of the Czech Republic, Institute of Animal Physiology and Genetics, Libĕchov, Czech Republic.
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Pavlok A. D-penicillamine and granulosa cells can effectively extend the fertile life span of bovine frozen-thawed spermatozoa in vitro: effect on fertilization and polyspermy. Theriogenology 2000; 53:1135-46. [PMID: 10798490 DOI: 10.1016/s0093-691x(00)00258-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
The effect of D-penicillamine on the fertile life span of frozen-thawed bull spermatozoa was studied in Experiment 1. After thawing, the washed spermatozoa were incubated for 8 h in fertilization medium with 1 mg/mL polyvinyl alcohol (PVA) and 0.5 mg/mL D-penicillamine. The addition of cumulus-free oocytes together with 10% of bovine serum (BOS) + 4 IU/mL heparin to the 8-h incubated spermatozoa resulted in high fertilization and polyspermy rates (97/103, 94.2% and 49/97, 50.5%, respectively). When BOS was substituted with 3 mg/mL of BSA, the fertilization and polyspermy rates decreased to 33/91 (36.3%) and 3/33 (9.1%), respectively. The total absence of fertilization was observed after substitution of proteins with PVA. The 8-h sperm incubation in fertilization medium without D-penicillamine and following fertilization in medium + different capacitation supplements resulted in the total absence of or a very low fertilization rate. In Experiment 2, the first set of cumulus-oocyte complexes (COC) and cumulus-free oocytes were fertilized for 8 h with nonincubated spermatozoa. The second set of COC and cumulus-free oocytes were fertilized in the same wells with spermatozoa after removal of the first set. The fertilization rate for the first set of COC and cumulus-free oocytes was 65/67 (97%) and 73/73 (100%), respectively, with 21/65 (32.3%) and 32/73 (43.8%) polyspermy, respectively. In the second set, the high penetration rate (67/73, 91.8%) was observed only for COC, while that for cumulus-free oocytes (19/76, 25%) was significantly lower (P < 0.01). In Experiment 3, the fertilization rate of COC in medium + PVA + 10 or 100 IU/mL heparin was 69/92 (75%) and 52/74 (70.2%), respectively, with no polyspermy. In medium + BSA + 10 or 100 IU/mL heparin, the fertilization rate of COC was 64/72 (88.9%) and 70/79 (88.6%), respectively, with polyspermy at 2/64 (3.1%) and 7/70 (10%), respectively. In medium + BOS + 10 or 100 IU/mL heparin, the fertilization rate was 79/82 (96.3%) and 79/80 (98.7%), respectively, with a significantly (P < 0.05) higher polyspermy rate (34/79, 43% and 30/79, 38%, respectively). The vitality and capacitation changes of frozen-thawed and 8-h incubated spermatozoa were assessed by Hoechst and chlortetracycline (CTC) staining.
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Affiliation(s)
- A Pavlok
- Institute of Animal Physiology and Genetics, Academy of Sciences of the Czech Republic, Libechov
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Brzyski RG, Leland MM, Eddy CA. In vitro maturation of baboon oocytes retrieved at the time of cesarean section. Fertil Steril 1999; 71:1153-6. [PMID: 10360928 DOI: 10.1016/s0015-0282(99)00130-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
OBJECTIVE To investigate the feasibility of oocyte retrieval at the time of cesarean delivery and the potential of such oocytes to undergo nuclear maturation in vitro using a baboon model and an established culture system. DESIGN Randomized, controlled animal study. SETTING Research foundation and university research laboratory. ANIMAL(S) Mature pregnant baboons. INTERVENTION(S) In vitro culture of aspirated oocytes with or without epidermal growth factor (EGF). MAIN OUTCOME MEASURE(S) Oocyte yield, germinal vesicle breakdown, polar body extrusion. RESULT(S) A total of 246 oocytes were retrieved (mean, 35; range, 14-67). Eighty-seven oocytes (35%) underwent germinal vesicle breakdown and 72 oocytes (29%) extruded a polar body. A chi2 analysis revealed no significant effect of EGF on outcome parameters. No effect of gestational age or maternal age on oocyte yield or development was observed. CONCLUSION(S) A sizeable proportion of oocytes obtained from puerperal primates exhibited the capacity to undergo nuclear maturation in vitro.
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Affiliation(s)
- R G Brzyski
- Department of Obstetrics and Gynecology, The University of Texas Health Science Center at San Antonio, 78284-7836, USA.
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Goudet G, Belin F, Bézard J, Gérard N. Intrafollicular content of luteinizing hormone receptor, alpha-inhibin, and aromatase in relation to follicular growth, estrous cycle stage, and oocyte competence for in vitro maturation in the mare. Biol Reprod 1999; 60:1120-7. [PMID: 10208973 DOI: 10.1095/biolreprod60.5.1120] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
Abstract
The intrafollicular content of LH receptor, alpha-inhibin, and aromatase are known good indicators of follicular status. We investigated the amounts of these proteins in granulosa and cumulus cells in relation to oocyte competence for in vitro maturation, follicular growth, and estrous cycle stage in the mare. Follicular punctures were performed 34 h after an injection of crude equine gonadotropins, either during the follicular phase, at the end of the follicular phase, or during the luteal phase. The cumulus-oocyte complex, granulosa cells, and follicular fluid of follicles larger than 5 mm were collected. The nuclear stage of the oocytes after in vitro culture was determined microscopically. Granulosa and cumulus cell amounts of LH receptor, alpha-inhibin, and aromatase were assessed by the semiquantitative Western blot method and image analysis. Follicular fluids were assayed for progesterone (P4) and estradiol-17beta (E2). The three factors were expressed in mural granulosa and cumulus cells from all follicles from the gonadotropin-independent growth period until the preovulatory stage. Considering all the follicles punctured, the amounts of LH receptor and alpha-inhibin in granulosa cells were not different for the three physiological stages studied. The amounts of aromatase in granulosa cells, as well as the E2:P4 ratios, were higher for follicles punctured during the follicular phase than for the two other groups (p < 0.05). Considering the data from the three groups, the E2:P4 ratio and the LH receptor and aromatase contents, but not alpha-inhibin, in granulosa cells increased with an increase in follicular diameter (p < 0.01). The E2:P4 ratios and the amounts of LH receptor, alpha-inhibin, and aromatase in granulosa cells were lower in follicles 5-9 mm in diameter than in larger ones (p < 0.05). In cumulus cells, the amounts of the three factors were different neither between the three groups nor between the follicular diameters. Although we could not establish any obvious relationship to oocyte competence for in vitro maturation, the influence of the follicle diameter on the content of LH receptors, alpha-inhibin, and aromatase in granulosa cells was similar to the influence of follicle diameter on oocyte competence. Therefore, one can hypothesize that, in the mare, there is a link between the acquisition of oocyte competence and the expression of these factors in the follicular cells.
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Affiliation(s)
- G Goudet
- I.N.R.A.-Haras Nationaux, Reproduction Equine, P.R.M.D., F-37380 Nouzilly, France
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Coy P, Ruiz S, Romar R, Campos I, Gadea J. Maturation, fertilization and complete development of porcine oocytes matured under different systems. Theriogenology 1999; 51:799-812. [PMID: 10729004 DOI: 10.1016/s0093-691x(99)00028-x] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
This study was designed 1) to determine the effectiveness of 2 in vitro maturation systems commonly employed to produce nuclear and cytoplasmically mature pig oocytes, 2) to assess the effects of boar, sperm concentration and maturation system on oocyte penetrability and male pronucleus formation and 3) to determine the ability of the in vitro matured oocytes to be fertilized in vivo by artificial insemination (AI) of sows. The differences examined between the 2 maturation systems included the culture medium (Waymouth vs TCM199), hormones, additives, culture conditions (static vs gentle agitation) presence or absence of porcine follicular fluid (PFF) and presence or absence of follicular shells. The results showed that nuclear maturation rate was similar in both systems (83.3 +/- 3.5 vs 86.4 +/- 2.5%), and intracellular content of glutathione was 5.21 +/- 0.73 vs 3.5 +/- 0.39 pmol/oocyte, although no correlation between these parameters was observed. The penetration rate and number of sperm cells per oocyte were dependent on the boar, maturation system and sperm concentration, but the rate of male pronuclear formation seemed to be influenced only by the boar and the maturation system but not by sperm concentration. In vivo fertilization of in vitro matured oocytes showed that both maturation systems could yield viable oocytes since 3 of 4 gilts and 2 of 4 gilts, respectively, became pregnant. Failure to become pregnant was not associated with inadequate oocyte maturation since control gilts, which received their own ovulated oocytes rather than in vitro matured oocytes at transfer, also did not become pregnant. We conclude that polyspermy may be an inherent problem in the IVF but not in the IVM systems.
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Affiliation(s)
- P Coy
- Department of Animal Biology, University of Murcia, Spain.
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Abeydeera LR, Wang WH, Cantley TC, Rieke A, Prather RS, Day BN. Presence of epidermal growth factor during in vitro maturation of pig oocytes and embryo culture can modulate blastocyst development after in vitro fertilization. Mol Reprod Dev 1998; 51:395-401. [PMID: 9820198 DOI: 10.1002/(sici)1098-2795(199812)51:4<395::aid-mrd6>3.0.co;2-y] [Citation(s) in RCA: 89] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The present study examined the effect of epidermal growth factor (EGF) during in vitro maturation (IVM) and embryo culture on blastocyst development in the pig. In experiment 1, cumulus oocyte complexes were cultured in North Carolina State University (NCSU) 23 medium containing porcine follicular fluid, cysteine, hormonal supplements, and with or without EGF (0-40 ng/ml) for 20-22 hr. They then were cultured for an additional 20-22 hr without hormones. After maturation, cumulus-free oocytes were co-incubated with frozen-thawed spermatozoa for 5-6 hr. Putative embryos were transferred to NCSU 23 containing 0.4% BSA and cultured for 144 hr. In experiment 2, oocytes were matured in medium containing 10 ng/ml EGF, inseminated, and putative embryos were cultured in the presence of 0-40 ng/ml EGF. In experiment 3, oocytes were cultured in the presence of 0, 10 and 40 ng/ml EGF to examine the kinetics of meiotic maturation. In experiment 4, 2- to 4-cell and 8-cell to morula stage embryos derived from oocytes matured with 10 ng/ml EGF were transferred to the oviduct and uterus, respectively, of each of three recipient gilts (3 and 4 days post-estrus, respectively). The presence or absence of EGF during IVM did not affect cumulus expansion, nuclear maturation, fertilization parameters, or cleavage rate. However, compared to no addition (21%), presence of 1 (33%) and 10 ng/ml EGF (42%) during IVM increased (P < 0.01) the rate of blastocyst development in a concentration-dependent manner. Compared to 10 ng/ml EGF, higher concentrations (20 and 40 ng/ml) reduced (P < 0.01) blastocyst development in a concentration-dependent manner (35% and 24%, respectively). No difference was observed between no addition and 40 ng/ml EGF (22%). Compared to no addition and 10 ng/ml EGF, a significantly (P < 0.001) higher proportion (25% vs. 55%) of oocytes reached metaphase II stage 33 hr after IVM with 40 ng/ml EGF. However, no difference was observed at 44 hr. Transfer of embryos to six recipient gilts resulted in three pregnancies and birth of 18 piglets. The results show that EGF at certain concentrations in IVM medium can influence the developmental competence of oocytes. However, addition of EGF during the culture of pig embryos derived from oocytes matured in the presence of EGF is without effect. Birth of piglets provides evidence that embryos derived from oocytes matured in a medium containing EGF are viable.
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Affiliation(s)
- L R Abeydeera
- Department of Animal Sciences, University of Missouri-Columbia, 65211, USA
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Goudet G, Bézard J, Belin F, Duchamp G, Palmer E, Gérard N. Oocyte competence for in vitro maturation is associated with histone H1 kinase activity and is influenced by estrous cycle stage in the mare. Biol Reprod 1998; 59:456-62. [PMID: 9687322 DOI: 10.1095/biolreprod59.2.456] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
Abstract
The in vitro maturation rate of equine oocytes remains low, regardless of culture conditions. Our objective was to determine the reasons for failure of equine oocytes to resume meiosis during in vitro maturation and to ascertain the influence of the estrous cycle stage on meiotic competence. In 10 cyclic mares, 7 ultrasound-guided follicular punctures were performed alternately during the follicular phase (group DF; n = 3 punctures), at the end of the follicular phase (group EF; n = 2), and during the luteal phase (group DL; n = 2). We evaluated the competence of the oocytes for in vitro maturation and measured their maturation-promoting factor activity by histone H1 kinase assay. Puncturing once at the end of the follicular phase and once during the luteal phase, or three times during the follicular phase, yielded about 11 cumulus-oocyte complexes per 22 days. The maturation rate was different between the groups, 51% in group EF, 34% in group DL (p < 0.05), and 15% in group DF (p < 0.01), and it increased with an increase in follicular diameter (p < 0.05). After in vitro culture, the H1 kinase activity was lower in oocytes that remained in germinal vesicle or dense chromatin stages than in oocytes that reached metaphase I or metaphase II (p < 0.05). The H1 kinase activity was not different between oocytes in germinal vesicle stage after in vitro maturation and immature oocytes that were not cultured in vitro, and was higher in preovulatory oocytes that reached metaphase II in vivo than in the oocytes that reached metaphase II after in vitro maturation (p < 0.001). This is the first report on kinase activity in the equine oocyte.
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Affiliation(s)
- G Goudet
- Institut National de al Recerche Agronomique-Haras Nationaux, Equipe de Reproduction Equine, P.R.M.D., F-37380 Nouzilly, France
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YOSHIDA Y, YOSHIDA M, BAMBA K. Detection of Growth Factor mRNAs in Porcine Cumulus-Oocyte Complexes During Maturation In Vivo and In Vitro. J Reprod Dev 1998. [DOI: 10.1262/jrd.44.121] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
- Yumiko YOSHIDA
- Department of Applied Biological Chemistry, Faculty of Agriculture, Shizuoka University, Shizuoka 422-8529, Japan
| | - Mitsutoshi YOSHIDA
- Department of Applied Biological Chemistry, Faculty of Agriculture, Shizuoka University, Shizuoka 422-8529, Japan
| | - Kimio BAMBA
- Department of Applied Biological Chemistry, Faculty of Agriculture, Shizuoka University, Shizuoka 422-8529, Japan
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YOSHIDA Y, YOSHIDA M, BAMBA K. Expression of mRNA for Growth Factor Receptors in Porcine Cumulus-Oocyte Complexes during In Vitro Maturation. J Reprod Dev 1998. [DOI: 10.1262/jrd.44.65] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Affiliation(s)
- Yumiko YOSHIDA
- Department of Applied Biological Chemistry, Faculty of Agriculture, Shizuoka University, Shizuoka 422-8529, Japan
| | - Mitsutoshi YOSHIDA
- Department of Applied Biological Chemistry, Faculty of Agriculture, Shizuoka University, Shizuoka 422-8529, Japan
| | - Kimio BAMBA
- Department of Applied Biological Chemistry, Faculty of Agriculture, Shizuoka University, Shizuoka 422-8529, Japan
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