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Okumura H, Mizuno A, Iwamoto E, Sakuma R, Nishio S, Nishijima KI, Matsuda T, Ujita M. New insights into the role of microheterogeneity of ZP3 during structural maturation of the avian equivalent of mammalian zona pellucida. PLoS One 2023; 18:e0283087. [PMID: 36943849 PMCID: PMC10030024 DOI: 10.1371/journal.pone.0283087] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2022] [Accepted: 02/11/2023] [Indexed: 03/23/2023] Open
Abstract
The egg coat including mammalian zona pellucida (ZP) and the avian equivalent, i.e., inner-perivitelline layer (IPVL), is a specialized extracellular matrix being composed of the ZP glycoproteins and surrounds both pre-ovulatory oocytes and ovulated egg cells in vertebrates. The egg coat is well known for its potential importance in both the reproduction and early development, although the underlying molecular mechanisms remain to be fully elucidated. Interestingly, ZP3, one of the ZP-glycoprotein family members forming scaffolds of the egg-coat matrices with other ZP glycoproteins, exhibits extreme but distinctive microheterogeneity to form a large number of isoelectric-point isoforms at least in the chicken IPVL. In the present study, we performed three-dimensional confocal imaging and two-dimensional polyacrylamide-gel electrophoresis (2D-PAGE) of chicken IPVLs that were isolated from the ovarian follicles at different growth stages before ovulation. The results suggest that the relative proportions of the ZP3 isoforms are differentially altered during the structural maturation of the egg-coat matrices. Furthermore, tandem mass spectrometry (MS/MS) analyses and ZP1 binding assays against separated ZP3 isoforms demonstrated that each ZP3 isoform contains characteristic modifications, and there are large differences among ZP3 isoforms in the ZP1 binding affinities. These results suggest that the microheterogeneity of chicken ZP3 might be regulated to be associated with the formation of egg-coat matrices during the structural maturation of chicken IPVL. Our findings may provide new insights into molecular mechanisms of egg-coat assembly processes.
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Affiliation(s)
- Hiroki Okumura
- Department of Applied Biological Chemistry, Faculty of Agriculture, Meijo University, Nagoya, Japan
| | - Ayaka Mizuno
- Department of Applied Biological Chemistry, Faculty of Agriculture, Meijo University, Nagoya, Japan
| | - Eri Iwamoto
- Department of Applied Biological Chemistry, Faculty of Agriculture, Meijo University, Nagoya, Japan
| | - Rio Sakuma
- Department of Applied Biological Chemistry, Faculty of Agriculture, Meijo University, Nagoya, Japan
| | - Shunsuke Nishio
- Department of Biosciences and Nutrition, Karolinska Institutet, Huddinge, Sweden
| | - Ken-Ichi Nishijima
- Avian Bioscience Research Center, Graduate School of Bioagricultural Sciences, Nagoya University, Tokai National Higher Education and Research System, Nagoya, Japan
| | - Tsukasa Matsuda
- Faculty of Food and Agricultural Sciences, Fukushima University, Fukushima, Japan
| | - Minoru Ujita
- Department of Applied Biological Chemistry, Faculty of Agriculture, Meijo University, Nagoya, Japan
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Killingbeck EE, Wilburn DB, Merrihew GE, MacCoss MJ, Swanson WJ. Proteomics support the threespine stickleback egg coat as a protective oocyte envelope. Mol Reprod Dev 2021; 88:500-515. [PMID: 34148267 PMCID: PMC8362008 DOI: 10.1002/mrd.23517] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2020] [Revised: 05/20/2021] [Accepted: 05/22/2021] [Indexed: 12/20/2022]
Abstract
Ancestrally marine threespine stickleback fish (Gasterosteus aculeatus) have undergone an adaptive radiation into freshwater environments throughout the Northern Hemisphere, creating an excellent model system for studying molecular adaptation and speciation. Ecological and behavioral factors have been suggested to underlie stickleback reproductive isolation and incipient speciation, but reproductive proteins mediating gamete recognition during fertilization have so far remained unexplored. To begin to investigate the contribution of reproductive proteins to stickleback reproductive isolation, we have characterized the stickleback egg coat proteome. We find that stickleback egg coats are comprised of homologs to the zona pellucida (ZP) proteins ZP1 and ZP3, as in other teleost fish. Our molecular evolutionary analyses indicate that across teleosts, ZP3 but not ZP1 has experienced positive Darwinian selection. Mammalian ZP3 is also rapidly evolving, and surprisingly some residues under selection in stickleback and mammalian ZP3 directly align. Despite broad homology, however, we find differences between mammalian and stickleback ZP proteins with respect to glycosylation, disulfide bonding, and sites of synthesis. Taken together, the changes we observe in stickleback ZP protein architecture suggest that the egg coats of stickleback fish, and perhaps fish more generally, have evolved to fulfill a more protective functional role than their mammalian counterparts.
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Affiliation(s)
- Emily E Killingbeck
- Department of Genome Sciences, University of Washington, Seattle, Washington, USA
| | - Damien B Wilburn
- Department of Genome Sciences, University of Washington, Seattle, Washington, USA
| | - Gennifer E Merrihew
- Department of Genome Sciences, University of Washington, Seattle, Washington, USA
| | - Michael J MacCoss
- Department of Genome Sciences, University of Washington, Seattle, Washington, USA
| | - Willie J Swanson
- Department of Genome Sciences, University of Washington, Seattle, Washington, USA
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Nishimura K, Dioguardi E, Nishio S, Villa A, Han L, Matsuda T, Jovine L. Molecular basis of egg coat cross-linking sheds light on ZP1-associated female infertility. Nat Commun 2019; 10:3086. [PMID: 31300655 DOI: 10.1038/s41467-019-10931-5] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2018] [Accepted: 06/11/2019] [Indexed: 12/19/2022] Open
Abstract
Mammalian fertilisation begins when sperm interacts with the egg zona pellucida (ZP), whose ZP1 subunit is important for fertility by covalently cross-linking ZP filaments into a three-dimensional matrix. Like ZP4, a structurally-related component absent in the mouse, ZP1 is predicted to contain an N-terminal ZP-N domain of unknown function. Here we report a characterisation of ZP1 proteins carrying mutations from infertile patients, which suggests that, in human, filament cross-linking by ZP1 is crucial to form a stable ZP. We map the function of ZP1 to its ZP-N1 domain and determine crystal structures of ZP-N1 homodimers from a chicken homolog of ZP1. These reveal that ZP filament cross-linking is highly plastic and can be modulated by ZP1 fucosylation and, potentially, zinc sparks. Moreover, we show that ZP4 ZP-N1 forms non-covalent homodimers in chicken but not in human. Together, these data identify human ZP1 cross-links as a promising target for non-hormonal contraception.
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Abstract
An ovulated egg of vertebrates is surrounded by unique extracellular matrix, the egg coat or zona pellucida, playing important roles in fertilization and early development. The vertebrate egg coat is composed of two to six zona pellucida (ZP) glycoproteins that are characterized by the evolutionarily conserved ZP-domain module and classified into six subfamilies based on phylogenetic analyses. Interestingly, investigations of biochemical and functional features of the ZP glycoproteins show that the roles of each ZP-glycoprotein family member in the egg-coat formation and the egg-sperm interactions seemingly vary across vertebrates. This might be one reason why comprehensive understandings of the molecular basis of either architecture or physiological functions of egg coat still remain elusive despite more than 3 decades of intensive investigations. In this chapter, an overview of avian egg focusing on the oogenesis are provided in the first section, and unique features of avian egg coat, i.e., perivitelline layer, including the morphology, biogenesis pathway, and physiological functions are discussed mainly on chicken and quail in terms of the characteristics of ZP glycoproteins in the following sections. In addition, these features of avian egg coat are compared to mammalian zona pellucida, from the viewpoint that the structural and functional varieties of ZP glycoproteins might be associated with the evolutionary adaptation to their reproductive strategies. By comparing the egg coat of birds and mammals whose reproductive strategies are largely different, new insights into the molecular mechanisms of vertebrate egg-sperm interactions might be provided.
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Affiliation(s)
- Hiroki Okumura
- Department of Applied Biological Chemistry, Faculty of Agriculture, Meijo University, Nagoya, Japan.
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Abstract
Birds are oviparous vertebrates in terrestrial animals. Birds' eggs accumulate mass of egg yolk during the egg development and are accordingly much larger than the eggs of viviparous vertebrates. Despite such difference in size and contents, the birds' eggs are surrounded with the egg-coat morphologically and compositionally resembling the mammalian egg-coat, zona pellucida. On the other hand, there are some differences in part between the two egg-coats, though relationships of such structural differences to any biological roles specific for the extracellular matrix of birds' eggs are not fully understood. In birds, unlike mammals, ZP proteins constituting the egg-coat are highly conserved and therefore those of chicken are described as a representative of birds. The egg-coat ZP proteins, ZP1, ZP3, and ZPD as the majors, accumulate and form the matrix by self-assembly around the egg rapidly growing in the ovarian follicle, in which ZP1 is from liver and both ZP3 and ZPD are from follicular granulosa cells. Although details of the egg-coat-sperm interaction on fertilization remain to be investigated, the lytic degradation process of egg-coat matrix for the sperm penetration has become to be clarified gradually. ZP1 is the primary target of sperm acrosin, and the limited cleavage in the specific region leading to the loss of intermolecular cross-linkages is crucial for the lysis of egg-coat matrix. Possible roles of the ZP1 with the additional sequence characteristic to birds are discussed from a viewpoint of giving both robustness and elastomeric nature to the egg-coat matrix for the birds' eggs.
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Affiliation(s)
- Shunsuke Nishio
- Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, Japan
| | | | - Tsukasa Matsuda
- Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, Japan.
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Okumura H, Sato T, Sakuma R, Fukushima H, Matsuda T, Ujita M. Identification of distinctive interdomain interactions among ZP-N, ZP-C and other domains of zona pellucida glycoproteins underlying association of chicken egg-coat matrix. FEBS Open Bio 2015; 5:454-65. [PMID: 26106520 PMCID: PMC4475693 DOI: 10.1016/j.fob.2015.05.005] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2015] [Revised: 05/15/2015] [Accepted: 05/22/2015] [Indexed: 12/12/2022] Open
Abstract
Chicken ZP1 and ZP3 assemble through strong interactions between their ZP-C domains. ZP-C domains of chicken ZP1 and ZP3 are deeply embedded in the egg-coat matrix. Chicken ZP1 forms a homocomplex through non-covalent interaction between repeat domains. Chicken ZPD is deposited on the interstices of ZP1–ZP3 matrix in the egg coat. We propose a model for the architecture of chicken egg-coat matrix from these results.
The vertebrate egg coat, including mammalian zona pellucida, is an oocyte-specific extracellular matrix comprising two to six zona pellucida (ZP) glycoproteins. The egg coat plays important roles in fertilization, especially in species-specific interactions with sperm to induce the sperm acrosome reaction and to form the block to polyspermy. It is suggested that the physiological functions of the egg coat are mediated and/or regulated coordinately by peptide and carbohydrate moieties of the ZP glycoproteins that are spatially arranged in the egg coat, whereas a comprehensive understanding of the architecture of vertebrate egg-coat matrix remains elusive. Here, we deduced the orientations and/or distributions of chicken ZP glycoproteins, ZP1, ZP3 and ZPD, in the egg-coat matrix by confocal immunofluorescent microscopy, and in the ZP1–ZP3 complexes generated in vitro by co-immunoprecipitation assays. We further confirmed interdomain interactions of the ZP glycoproteins by far-Western blot analyses of the egg-coat proteins and pull-down assays of ZP1 in the serum, using recombinant domains of ZP glycoproteins as probes. Our results suggest that the ZP1 and ZP3 bind through their ZP-C domains to form the ZP1–ZP3 complexes and fibrils, which are assembled into bundles through interactions between the repeat domains of ZP1 to form the ZP1–ZP3 matrix, and that the ZPD molecules self-associate and bind to the ZP1–ZP3 matrix through its ZP-N and ZP-C domains to form the egg-coat matrix. Based on these results, we propose a tentative model for the architecture of the chicken egg-coat matrix that might be applicable to other vertebrate ones.
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Key Words
- CBB, Coomassie Brilliant Blue
- DIC, differential interference contrast
- DTT, dithiothreitol
- EGF, epidermal growth factor
- EHP, external hydrophobic patch
- Egg coat
- Extracellular matrix
- Fertilization
- His6, hexahistidine
- IHP, internal hydrophobic patch
- Interdomain interaction
- MBP, maltose binding protein
- RT, room temperature
- TGFR, transforming growth factor-β receptor
- THP, Tamm–Horsfall protein
- Trx, thioredoxin
- ZP, zona pellucida
- Zona pellucida
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Affiliation(s)
- Hiroki Okumura
- Department of Applied Biological Chemistry, Graduate School of Agriculture, Meijo University, Nagoya 468-8502, Japan
- Corresponding author. Tel.: +81 52 838 2451; fax: +81 52 833 5524.
| | - Takahiro Sato
- Department of Applied Biological Chemistry, Graduate School of Agriculture, Meijo University, Nagoya 468-8502, Japan
| | - Rio Sakuma
- Department of Applied Biological Chemistry, Graduate School of Agriculture, Meijo University, Nagoya 468-8502, Japan
| | - Hideaki Fukushima
- Department of Applied Biological Chemistry, Graduate School of Agriculture, Meijo University, Nagoya 468-8502, Japan
| | - Tsukasa Matsuda
- Department of Applied Molecular Biosciences, Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya 464-8601, Japan
| | - Minoru Ujita
- Department of Applied Biological Chemistry, Graduate School of Agriculture, Meijo University, Nagoya 468-8502, Japan
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Nishio S, Kohno Y, Iwata Y, Arai M, Okumura H, Oshima K, Nadano D, Matsuda T. Glycosylated Chicken ZP2 Accumulates in the Egg Coat of Immature Oocytes and Remains Localized to the Germinal Disc Region of Mature Eggs1. Biol Reprod 2014; 91:107. [DOI: 10.1095/biolreprod.114.119826] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
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Abstract
The zona pellucida (ZP), which surrounds the mammalian oocyte, functions in various aspects of fertilization. The ZP consists of three or four glycoproteins, which are derived from transmembrane proteins that lack the ability to self-assemble. Following posttranslational processing at specific sites, ectodomains of ZP precursor proteins are released from the membrane and begin to form a matrix. Glycosylational modification is thought to be involved in species-selective sperm recognition by ZP proteins. However, in mice, the supramolecular structure of the zona matrix is also important in sperm recognition. One ZP protein, ZP2, is processed at a specific site upon fertilization by ovastacin, which is released from cortical granules inside the oocyte. This phenomenon is involved in the block to polyspermy. The proteolysis of ubiquitinated ZP proteins by a sperm-associated proteasome is involved in penetration of the zona matrix by sperm, at least in the pigs. Thus, the posttranslational modification of ZP proteins is closely tied to ZP formation and the regulation of sperm-oocyte interactions.
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Okumura H, Fukushima H, Momoda M, Ima Y, Matsuda T, Ujita M. Diverse lectin-binding specificity of four ZP3 glycoprotein isoforms with a discrete isoelectric point in chicken egg coat. Biochem Biophys Res Commun 2012; 424:586-92. [PMID: 22776203 DOI: 10.1016/j.bbrc.2012.06.157] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2012] [Accepted: 06/29/2012] [Indexed: 10/28/2022]
Abstract
The vertebrate egg coat corresponding to mammalian zona pellucida is a filamentous matrix composed of highly and heterogeneously glycosylated proteins designated ZP glycoproteins including ZP1 to 4, ZPD and ZPAX, and play important roles in species-specific egg-sperm interactions. Recent advance in structural biology of chicken ZP3 provided new insights into molecular mechanisms of the egg-coat function involving its carbohydrate moieties. In this study, chicken ZP3 was separated into four major and distinct isoforms with different pI in 2D-PAGE. To investigate the meanings of the ZP3 heterogeneity in egg-sperm interactions, we preliminary analyzed glycan diversity on the molecules by using lectin-staining assays. The four major ZP3 isoforms 4-7 (from acidic to basic) were recognized equally with PNA (Galβ1-3GalNAc), but the isoforms 5-7 were recognized dominantly with WGA ((β-GlcNAc)n, clustered Sia), PHA-E (bi- and triantennary N-glycan containing Galβ1-4GlcNAcβ1-2Manα1-6) and RCA I (terminal Galβ1-4GlcNAc), respectively. Despite such sugar chain diversity among the ZP3 isoforms, a partner in the egg coat, ZP1, showed specific binding to each isoform equally. Localization of ZP1 and ZP3 in the egg-coat matrix were also analyzed.
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Affiliation(s)
- Hiroki Okumura
- Department of Applied Biological Chemistry, Faculty of Agriculture, Meijo University, Nagoya 468-8502, Japan.
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Han L, Monné M, Okumura H, Schwend T, Cherry AL, Flot D, Matsuda T, Jovine L. Insights into Egg Coat Assembly and Egg-Sperm Interaction from the X-Ray Structure of Full-Length ZP3. Cell 2010; 143:404-15. [DOI: 10.1016/j.cell.2010.09.041] [Citation(s) in RCA: 118] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2010] [Revised: 08/11/2010] [Accepted: 08/24/2010] [Indexed: 11/15/2022]
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Kinoshita M, Rodler D, Sugiura K, Matsushima K, Kansaku N, Tahara K, Tsukada A, Ono H, Yoshimura T, Yoshizaki N, Tanaka R, Kohsaka T, Sasanami T. Zona pellucida protein ZP2 is expressed in the oocyte of Japanese quail (Coturnix japonica). Reproduction 2010; 139:359-71. [DOI: 10.1530/rep-09-0222] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The avian perivitelline layer (PL), a vestment homologous to the zona pellucida (ZP) of mammalian oocytes, is composed of at least three glycoproteins. Our previous studies have demonstrated that the matrix's components, ZP3 and ZPD, are synthesized in ovarian granulosa cells. Another component, ZP1, is synthesized in the liver and is transported to the ovary by blood circulation. In this study, we report the isolation of cDNA encoding quailZP2and its expression in the female bird. By RNase protection assay andin situhybridization, we demonstrate that ZP2 transcripts are restricted to the oocytes of small white follicles (SWF). The expression level ofZP2decreased dramatically during follicular development, and the highest expression was observed in the SWF. Western blot and immunohistochemical analyses using the specific antibody against ZP2 indicate that the 80 kDa protein is the authentic ZP2, and the immunoreactive ZP2 protein is also present in the oocytes. Moreover, ultrastructural analysis demonstrated that the immunoreactive ZP2 localizes to the zona radiata, the perivitelline space, and the oocyte cytoplasm in the SWF. By means of western blot analysis and immunofluorescence microscopy, we detected a possible interaction of the recombinant ZP2 with ZP3 and that this interaction might lead to the formation of amorphous structure on the cell surface. These results demonstrate for the first time that the avian ZP gene is expressed in the oocyte, and that the ZP2 protein in the oocyte might play a role for the PL formation in the immature follicles of the ovary.
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Matsubara T, Aoki N, Hino S, Okajima T, Nadano D, Matsuda T. Serum and monoclonal immunoglobulin E antibodies from NC/Nga mice with severe atopic-like dermatitis recognize an auto-antigen, histone H3. Clin Exp Allergy 2009; 39:579-90. [PMID: 19226275 DOI: 10.1111/j.1365-2222.2008.03174.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
BACKGROUND NC/Nga mice are known to show a spontaneous outbreak of atopic-like dermatitis accompanied by a marked elevation in serum IgE levels when reared in a conventional environment. The specific effects of such a strong serum IgE response on the development of the dermatitis and specific antigens recognized by the IgE antibodies are still uncertain. OBJECTIVE AND METHODS To characterize the IgE of NC/Nga mice, we established IgE-secreting hybridoma clones from spleen cells of NC/Nga mice spontaneously developing dermatitis and identified variable-region genes and specific antigens of the IgE monoclonal antibodies (mAbs). Serum polyclonal IgE, as well as IgG1 and IgG2a, specific for the identified antigen were also analysed. RESULTS Four IgE-producing hybridoma clones were established. Variable-region nucleotide sequences of the IgE mAbs showed that these clones did not necessarily share common germline gene segments (V, D or J) for each variable region, and several somatic mutations had occurred in the V gene segments. Through antigen screening, histone H3 was identified to be an auto-antigen recognized by three of the four IgE mAbs. Serum IgE as well as IgG1 specific for histone H3 were almost undetectable in 6-week-old mice, but rapidly increased by 10-12 weeks of age. This age-dependent increase in the serum anti-histone H3 IgE was roughly in parallel with the onset of dermatitis, and slightly preceding total IgE elevation. The serum-specific IgE level correlated well with a dermatitis-severity score of each mouse at 12-16 weeks of age, and weakly with the severity of ear erosion of each mouse over 28 weeks of age. Furthermore, immunologically detectable histone-H3 antigens were observed in skin tissue sections from the dermatitis sites. CONCLUSION In NC/Nga mice, anti-histone H3 auto-antibodies may contribute, at least in part, to the considerably elevated serum IgE and might play some roles in the development and exacerbation of dermatitis.
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Affiliation(s)
- T Matsubara
- Department of Applied Molecular Biosciences, Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, Japan
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Kinoshita M, Mizui K, Ishiguro T, Ohtsuki M, Kansaku N, Ogawa H, Tsukada A, Sato T, Sasanami T. Incorporation of ZP1 into perivitelline membrane after in vivo treatment with exogenous ZP1 in Japanese quail (Coturnix japonica). FEBS J 2008; 275:3580-9. [DOI: 10.1111/j.1742-4658.2008.06503.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Elis S, Batellier F, Couty I, Balzergue S, Martin-Magniette ML, Monget P, Blesbois E, Govoroun MS. Search for the genes involved in oocyte maturation and early embryo development in the hen. BMC Genomics 2008; 9:110. [PMID: 18312645 PMCID: PMC2322995 DOI: 10.1186/1471-2164-9-110] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2007] [Accepted: 02/29/2008] [Indexed: 01/01/2023] Open
Abstract
Background The initial stages of development depend on mRNA and proteins accumulated in the oocyte, and during these stages, certain genes are essential for fertilization, first cleavage and embryonic genome activation. The aim of this study was first to search for avian oocyte-specific genes using an in silico and a microarray approaches, then to investigate the temporal and spatial dynamics of the expression of some of these genes during follicular maturation and early embryogenesis. Results The in silico approach allowed us to identify 18 chicken homologs of mouse potential oocyte genes found by digital differential display. Using the chicken Affymetrix microarray, we identified 461 genes overexpressed in granulosa cells (GCs) and 250 genes overexpressed in the germinal disc (GD) of the hen oocyte. Six genes were identified using both in silico and microarray approaches. Based on GO annotations, GC and GD genes were differentially involved in biological processes, reflecting different physiological destinations of these two cell layers. Finally we studied the spatial and temporal dynamics of the expression of 21 chicken genes. According to their expression patterns all these genes are involved in different stages of final follicular maturation and/or early embryogenesis in the chicken. Among them, 8 genes (btg4, chkmos, wee, zpA, dazL, cvh, zar1 and ktfn) were preferentially expressed in the maturing occyte and cvh, zar1 and ktfn were also highly expressed in the early embryo. Conclusion We showed that in silico and Affymetrix microarray approaches were relevant and complementary in order to find new avian genes potentially involved in oocyte maturation and/or early embryo development, and allowed the discovery of new potential chicken mature oocyte and chicken granulosa cell markers for future studies. Moreover, detailed study of the expression of some of these genes revealed promising candidates for maternal effect genes in the chicken. Finally, the finding concerning the different state of rRNA compared to that of mRNA during the postovulatory period shed light on some mechanisms through which oocyte to embryo transition occurs in the hen.
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Affiliation(s)
- Sebastien Elis
- Physiologie de Reproduction et des Comportements, UMR 6175 INRA-CNRS-Université F, Rabelais de Tours, Haras Nationaux, 37380 Nouzilly, France.
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Ohtsuki M, Hiyama G, Kansaku N, Ogawa H, Mori M, Sasanami T. Cloning of Perivitelline Membrane Protein; ZP1 in Turkey (Meleagris gallopavo). J Poult Sci 2008; 45:67-74. [DOI: 10.2141/jpsa.45.67] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Kanai S, Kitayama T, Yonezawa N, Sawano Y, Tanokura M, Nakano M. Disulfide linkage patterns of pig zona pellucida glycoproteins ZP3 and ZP4. Mol Reprod Dev 2008; 75:847-56. [DOI: 10.1002/mrd.20836] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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Okumura H, Okajima T, Nadano D, Matsuda T. Association of chicken zona pellucida glycoprotein (ZP) B1 with ZPC induces formation of ZPB1-ZPC fibrous aggregates containing disulfide-bridged ZPB1 dimer. Biochem Biophys Res Commun 2007; 364:682-8. [PMID: 17964539 DOI: 10.1016/j.bbrc.2007.10.072] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2007] [Accepted: 10/15/2007] [Indexed: 02/07/2023]
Abstract
Egg-envelope, a fibrous extracellular matrix, surrounding an oocyte is constructed from ZPC, ZPX2, both of which are secreted from ovarian granulosa cells, and ZPB1 which is secreted from liver cells and transported into ovary in birds. We report here that in vitro incubation of ZPB1 with ZPC spontaneously produced fibrous aggregates of ZPB1-ZPC hetero-complexes, which were visible under optical microscopy and morphologically resembled the aggregates obtained from mechanically decomposed chicken egg-envelope. Formation of such fibrous aggregates depended on ZPC/ZPB1 ratio, and involved ZPB1 dimerization through disulfide cross-linking, which had been found in authentic egg-envelope developed in hen's ovary. Furthermore, addition of excessive amounts of ZPC to ZPB1 produced soluble but high molecular weight hetero-complexes with increased adherence property against polystyrene ELISA plates. Thus, the specific association between ZPB1 and ZPC could play pivotal roles to initiate complex formation of hetero-polymers of ZP proteins in egg-envelope matrix construction.
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Affiliation(s)
- Hiroki Okumura
- Department of Applied Molecular Biosciences, Graduate School of Bio-agricultural Sciences, Nagoya University, Nagoya 464-8601, Japan
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