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Yang B, Hao T, Yang S, Hao H, Du W, Zhu H, Zhang P, Zhao X. Study on the expression patterns and function of JUNO and CD9 in bovine oocytes during in vitro maturation. Reprod Domest Anim 2023; 58:81-88. [PMID: 36107170 DOI: 10.1111/rda.14262] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2022] [Revised: 08/16/2022] [Accepted: 09/14/2022] [Indexed: 01/13/2023]
Abstract
Fertilization proteins JUNO and CD9 play vital roles in sperm-egg fusion, but little is known about their expression patterns during in vitro maturation (IVM) and their function during in vitro fertilization (IVF) of bovine oocytes. In this study, qRT-PCR and immunofluorescence staining were used to detect the mRNA and protein expression levels of JUNO and CD9 genes in bovine oocytes and cumulus cells. Then, fertilization rate of MII oocytes treated with (i) JUNO antibody (1, 5 and 25 μg/ml) or (ii) CD9 antibody (1, 5 and 25 μg/ml) or (iii) CD9 antibody (5 μg/ml) + JUNO antibody (5 μg/ml) were recorded. Our results showed that the mRNA and protein expression levels of JUNO and CD9 genes significantly increased from bovine GV oocytes to MII oocytes, and similar mRNA expression patterns of JUNO and CD9 were also detected in cumulus cells. All groups of oocytes treated with CD9 antibody or JUNO antibody showed significantly decreased fertilization rates (p < .05). Particularly, the fertilization ability of oocytes treated with CD9 antibody (5 μg/ml) + JUNO antibody (5 μg/ml) sharply decreased to 3.48 ± 0.11%. In conclusion, our study revealed the expression levels of JUNO and CD9 genes in oocytes and cumulus cells increased during IVM of bovine oocytes, with JUNO protein playing a major role in the fertilization of bovine oocytes.
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Affiliation(s)
- Baigao Yang
- Institute of Animal Sciences (IAS), Chinese Academy of Agricultural Sciences (CAAS), Beijing, China
| | - Tong Hao
- Institute of Animal Sciences (IAS), Chinese Academy of Agricultural Sciences (CAAS), Beijing, China
| | - Sha Yang
- Institute of Animal Sciences (IAS), Chinese Academy of Agricultural Sciences (CAAS), Beijing, China
| | - Haisheng Hao
- Institute of Animal Sciences (IAS), Chinese Academy of Agricultural Sciences (CAAS), Beijing, China
| | - Weihua Du
- Institute of Animal Sciences (IAS), Chinese Academy of Agricultural Sciences (CAAS), Beijing, China
| | - Huabin Zhu
- Institute of Animal Sciences (IAS), Chinese Academy of Agricultural Sciences (CAAS), Beijing, China
| | - Peipei Zhang
- Institute of Animal Sciences (IAS), Chinese Academy of Agricultural Sciences (CAAS), Beijing, China
| | - Xueming Zhao
- Institute of Animal Sciences (IAS), Chinese Academy of Agricultural Sciences (CAAS), Beijing, China
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Jean C, Haghighirad F, Zhu Y, Chalbi M, Ziyyat A, Rubinstein E, Gourier C, Yip P, Wolf JP, Lee JE, Boucheix C, Barraud-Lange V. JUNO, the receptor of sperm IZUMO1, is expressed by the human oocyte and is essential for human fertilisation. Hum Reprod 2019; 34:118-126. [PMID: 30517645 DOI: 10.1093/humrep/dey340] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2018] [Indexed: 12/27/2022] Open
Abstract
STUDY QUESTION Is JUNO protein present at the surface membrane of human oocytes and involved in the fertilisation process? SUMMARY ANSWER JUNO protein is expressed on the plasma membrane of human oocytes and its inhibition by a monoclonal antibody completely blocks gamete fusion. WHAT IS KNOWN ALREADY Fusion of gamete membranes is the culminating event of the fertilisation process, but its molecular mechanisms are poorly understood. Until now, three molecules have been shown to be essential: CD9 tetraspanin in the oocyte, Izumo1 protein on the sperm and Juno, its corresponding receptor on the oocyte. Oocyte CD9 and sperm IZUMO1 have been identified in human gametes and their interaction is also well-conserved among several mammalian species. The presence of JUNO on human oocytes, however, has not yet been reported, nor has its role in fertilisation been investigated. STUDY DESIGN, SIZE, DURATION We selected an anti-human JUNO antibody in order to investigate the presence of JUNO on the oocyte membrane surface and studied its potential involvement in gamete membrane interaction during fertilisation. PARTICIPANTS/MATERIALS, SETTING, METHODS Monoclonal antibodies against human JUNO (anti-hJUNO mAb) were produced by immunisation of mice with HEK cells transfected with the putative human JUNO sequence (HEK-hJUNO). These antibodies were used for immunostaining experiments and in vitro fertilisation assays with human gametes (GERMETHEQUE Biobank). MAIN RESULTS AND THE ROLE OF CHANCE Three hybridoma supernatants, verified by immunostaining, revealed specifically HEK-hJUNO cells. The three purified monoclonal antibodies, FJ2E4 (IgG1), FJ8E8 (IgG1) and FJ4F5 (IgG2a), recognised the soluble recombinant human JUNO protein and, in a western blot of HEK-hJUNO extracts, a protein with an expected MW of 25 kDa. In addition, soluble recombinant human IZUMO protein inhibited the binding of anti-hJUNO mAbs to cells expressing hJUNO. Using these anti-hJUNO mAbs in immunostaining, we identified the presence of JUNO protein at the plasma membrane of human oocytes. Furthermore, we revealed a progressive expression of JUNO according to oocyte maturity. Finally, we showed that human zona-free oocytes, inseminated in the presence of anti-hJUNO mAb, were not fertilised by human sperm. These results suggest that, as seen in the mouse, JUNO is indeed involved in human gamete membrane fusion during fertilisation. LARGE-SCALE DATA N/A. LIMITATIONS, REASONS FOR CAUTION In accordance with French bioethics laws, functional tests were performed using zona-free oocytes, which of course does not fully encompass all normal in vivo physiological conditions. However, these in vitro tests do provide direct information regarding sperm-oocyte membrane interactions. WIDER IMPLICATIONS OF THE FINDINGS Mechanisms of gamete fusion appear to be homologous between mice and humans. However, some differences do exist and analysing the human mechanisms is essential. In fact, this is the first report describing the presence of JUNO on human oocytes and its involvement in human fertilisation. This discovery allows further examination of the understanding of molecular mechanisms that drive gamete fusion: a crucial challenge at a time when infertility affects 16% of reproductively active couples. STUDY FUNDING/COMPETING INTERESTS This work was supported by the Agence Nationale pour la Recherche, Grant no. ANR-13-BVS5-0004, and by Association Institut du Cancer et d'Immunogénétique (ICIG). There are no competing interests.
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Affiliation(s)
- C Jean
- University Paris Descartes, Sorbonne Paris Cité, Faculty of Medicine, Assistance Publique-Hôpitaux de Paris, University Hospital Paris Centre, CHU Cochin, Laboratory of Histology Embryology Biology of Reproduction, 123 boulevard de Port Royal, Paris, France.,Department of Genetic, Development and Cancer, Cochin Institute, Inserm U1016, Team Genomic Epigenetic and Physiopathology of Reproduction, University Paris Descartes, Sorbonne Paris Cité, 22 rue Méchain, Paris, France
| | - F Haghighirad
- Inserm, UMR-S 935, SFR André Lwoff, 12 Avenue Paul Vaillant Couturier, Villejuif, France.,University Paris-Sud 11, UFR Medicine, 63 rue Gabriel Péri, Le Kremlin Bicêtre, France
| | - Y Zhu
- Inserm, UMR-S 935, SFR André Lwoff, 12 Avenue Paul Vaillant Couturier, Villejuif, France.,University Paris-Sud 11, UFR Medicine, 63 rue Gabriel Péri, Le Kremlin Bicêtre, France.,Department of Oncology, Tongji Hospital, Huazhong University of Science and Technology, Wuhan, Hubei Province, China
| | - M Chalbi
- Laboratory of Physic Statistic, Ecole Normale Superieure/PSL Research University, UPMC University Paris 6, University Paris Diderot, CNRS, 24 rue Lhomond, Paris, France
| | - A Ziyyat
- Department of Genetic, Development and Cancer, Cochin Institute, Inserm U1016, Team Genomic Epigenetic and Physiopathology of Reproduction, University Paris Descartes, Sorbonne Paris Cité, 22 rue Méchain, Paris, France
| | - E Rubinstein
- Inserm, UMR-S 935, SFR André Lwoff, 12 Avenue Paul Vaillant Couturier, Villejuif, France.,University Paris-Sud 11, UFR Medicine, 63 rue Gabriel Péri, Le Kremlin Bicêtre, France
| | - C Gourier
- Laboratory of Physic Statistic, Ecole Normale Superieure/PSL Research University, UPMC University Paris 6, University Paris Diderot, CNRS, 24 rue Lhomond, Paris, France
| | - P Yip
- Faculty of Medicine, Department of Laboratory Medicine and Pathobiology, University of Toronto, 1 King's College Circle, Room 6314, Toronto, ON, Canada
| | - J P Wolf
- University Paris Descartes, Sorbonne Paris Cité, Faculty of Medicine, Assistance Publique-Hôpitaux de Paris, University Hospital Paris Centre, CHU Cochin, Laboratory of Histology Embryology Biology of Reproduction, 123 boulevard de Port Royal, Paris, France.,Department of Genetic, Development and Cancer, Cochin Institute, Inserm U1016, Team Genomic Epigenetic and Physiopathology of Reproduction, University Paris Descartes, Sorbonne Paris Cité, 22 rue Méchain, Paris, France
| | - J E Lee
- Faculty of Medicine, Department of Laboratory Medicine and Pathobiology, University of Toronto, 1 King's College Circle, Room 6314, Toronto, ON, Canada
| | - C Boucheix
- Inserm, UMR-S 935, SFR André Lwoff, 12 Avenue Paul Vaillant Couturier, Villejuif, France.,University Paris-Sud 11, UFR Medicine, 63 rue Gabriel Péri, Le Kremlin Bicêtre, France
| | - V Barraud-Lange
- University Paris Descartes, Sorbonne Paris Cité, Faculty of Medicine, Assistance Publique-Hôpitaux de Paris, University Hospital Paris Centre, CHU Cochin, Laboratory of Histology Embryology Biology of Reproduction, 123 boulevard de Port Royal, Paris, France.,Department of Genetic, Development and Cancer, Cochin Institute, Inserm U1016, Team Genomic Epigenetic and Physiopathology of Reproduction, University Paris Descartes, Sorbonne Paris Cité, 22 rue Méchain, Paris, France
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Suzuki B, Sugano Y, Ito J, Saito H, Niimura S, Yamashiro H. Location and expression of Juno in mice oocytes during maturation. JBRA Assist Reprod 2017; 21:321-326. [PMID: 29124919 PMCID: PMC5714599 DOI: 10.5935/1518-0557.20170065] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Objective Oocyte-sperm interaction is the essential step in fertilization. Juno, which
has been known as Folate receptor 4, is the Izumo1 receptor expressed on the
oocyte membrane. This study aims to investigate the location and expression
of Juno in mice oocytes during maturation. Methods To confirm the stage at which Juno expression begins in the mice oocytes and
its location pattern, we performed immunostaining methods. Next, we
evaluated Juno mRNA expression by a half quantitative RT-PCR. Juno knockdown
oocytes were generated by microinjecting siRNA into the germinal vesicle
(GV) stage oocytes, and analyzed the maturation rate. Results Our results showed that Juno was expressed on the surface of the oocyte
cytoplasmic membrane at the GV stage and it continues to be expressed at
similar levels in the metaphase II (MII) stages of oocytes maturation.
Interestingly, Juno is also expressed on the first polar body membrane at
the MII stage. Fluorescence showing Juno expression was decreased in the
oolemma of siRNA injected oocytes, but it was not completely disappearing in
knock down oocytes. MII stage-rates of siRNA injected oocytes were not
significantly different from sham controls. Conclusion Juno was expressed in oocytes at the GV stage and it continues to be
expressed at similar levels in later stages of oocytes maturation. Juno
accumulation in oolemma during oocyte maturation is essential for
fertilization, such as membrane recognition of both gametes.
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Affiliation(s)
- Banri Suzuki
- Laboratory of Animal Reproduction, Graduate School of Science and Technology, Niigata University, Japan
| | - Yukou Sugano
- Laboratory of Animal Reproduction, Graduate School of Science and Technology, Niigata University, Japan
| | - Jun Ito
- Laboratory of Animal Reproduction, Graduate School of Science and Technology, Niigata University, Japan
| | - Haruka Saito
- Laboratory of Animal Reproduction, Graduate School of Science and Technology, Niigata University, Japan
| | - Sueo Niimura
- Laboratory of Animal Reproduction, Graduate School of Science and Technology, Niigata University, Japan
| | - Hideaki Yamashiro
- Laboratory of Animal Reproduction, Graduate School of Science and Technology, Niigata University, Japan
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Zhou GB, Zeng Y, Meng QG, Liu Y, Dai YP, Zhu SE, Bunch TD, Hou YP. Decreased Expression of CD9 in Bovine Oocytes After Cryopreservation and the Relationship to Fertilization Capacity. Mol Reprod Dev 2013; 80:451-9. [DOI: 10.1002/mrd.22181] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2012] [Accepted: 04/04/2013] [Indexed: 01/08/2023]
Affiliation(s)
- Guang-Bin Zhou
- Institute of Animal Genetics and Breeding; College of Animal Science and Technology, Sichuan Agricultural University (Chengdu Campus); Wenjiang, P.R. China
- State Key Laboratory for Agrobiotechnology; College of Biological Sciences, and College of Animal Science and Technology, China Agricultural University; Beijing, P.R. China
| | - Yan Zeng
- State Key Laboratory for Agrobiotechnology; College of Biological Sciences, and College of Animal Science and Technology, China Agricultural University; Beijing, P.R. China
| | - Qing-Gang Meng
- Department of Animal, Dairy, and Veterinary Sciences; Utah State University; Logan, Utah
| | - Ying Liu
- State Key Laboratory for Agrobiotechnology; College of Biological Sciences, and College of Animal Science and Technology, China Agricultural University; Beijing, P.R. China
- Department of Animal Science; Aarhus University; Tjele Denmark
| | - Yun-Ping Dai
- State Key Laboratory for Agrobiotechnology; College of Biological Sciences, and College of Animal Science and Technology, China Agricultural University; Beijing, P.R. China
| | - Shi-En Zhu
- State Key Laboratory for Agrobiotechnology; College of Biological Sciences, and College of Animal Science and Technology, China Agricultural University; Beijing, P.R. China
| | - Thomas D. Bunch
- Department of Animal, Dairy, and Veterinary Sciences; Utah State University; Logan, Utah
| | - Yun-Peng Hou
- State Key Laboratory for Agrobiotechnology; College of Biological Sciences, and College of Animal Science and Technology, China Agricultural University; Beijing, P.R. China
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Li L, Madu CO, Lu A, Lu Y. HIF-1α Promotes A Hypoxia-Independent Cell Migration. THE OPEN BIOLOGY JOURNAL 2010; 3:8-14. [PMID: 20882121 PMCID: PMC2946250 DOI: 10.2174/1874196701003010008] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Hypoxia-inducible factor-1α (HIF-1α) is known as a transactivator for VEGF gene promoter. It can be induced by hypoxia. However, no study has been done so far to dissect HIF-1α-mediated effects from hypoxia or VEGF-mediated effects. By using a HIF-1α knockout (HIF-1α KO) cell system in mouse embryonic fibroblast (MEF) cells, this study analyzes cell migration and HIF-1α, hypoxia and VEGF activation. A hypoxia-mediated HIF-1α induction and VEGF transactivation were observed: both HIF-1α WT lines had significantly increased VEGF transactivation, as an indicator for HIF-1α induction, in hypoxia compared to normoxia; in contrast, HIF-1α KO line had no increased VEGF transactivation under hypoxia. HIF-1α promotes cell migration: HIF-1α-KO cells had a significantly reduced migration compared to that of the HIF-1α WT cells under both normoxia and hypoxia. The significantly reduced cell migration in HIF-1α KO cells can be partially rescued by the restoration of WT HIF-1α expression mediated by adenoviral-mediated gene transfer. Interestingly, hypoxia has no effect on cell migration: the cells had a similar cell migration rate under hypoxic and normoxic conditions for both HIF-1α WT and HIF-1α KO lines, respectively. Collectively, these data suggest that HIF-1α plays a role in MEF cell migration that is independent from hypoxia-mediated effects.
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Affiliation(s)
- Liyuan Li
- Department of Pathology and Laboratory Medicine, Memphis, TN
| | | | - Andrew Lu
- Department of Medicine, University of Tennessee Health Science Center, Memphis, TN
- Princeton University, Princeton, NJ, USA
| | - Yi Lu
- Department of Pathology and Laboratory Medicine, Memphis, TN
- Department of Medicine, University of Tennessee Health Science Center, Memphis, TN
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