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Barraud-Lange V, Ialy-Radio C, Chalas C, Holtzmann I, Wolf JP, Barbaux S, Ziyyat A. Partial Sperm beta1 Integrin Subunit Deletion Proves its Involvement in Mouse Gamete Adhesion/Fusion. Int J Mol Sci 2020; 21:ijms21228494. [PMID: 33187358 PMCID: PMC7696028 DOI: 10.3390/ijms21228494] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2020] [Revised: 11/06/2020] [Accepted: 11/08/2020] [Indexed: 12/22/2022] Open
Abstract
We have previously shown, using antibodies, that the sperm alpha6beta1 integrin is involved in mouse gamete fusion in vitro. Here we report the conditional knockdown of the sperm Itgb1 gene. It induced a drastic failure of sperm fusogenic ability with sperm accumulation in the perivitelline space of in vitro inseminated oocytes deleted or not for the Itgb1 gene. These data demonstrate that sperm, but not oocyte, beta1 integrin subunit is involved in gamete adhesion/fusion. Curiously, knockdown males were fertile in vivo probably because of the incomplete Cre-mediated deletion of the sperm Itgb1 floxed gene. Indeed, this was shown by Western blot analysis and confirmed by both the viability and litter size of pups obtained by mating partially sperm Itgb1 deleted males with females producing completely deleted Itgb1 oocytes. Because of the total peri-implantation lethality of Itgb1 deletion in mice, we assume that sperm that escaped the Itgb1 excision seemed to be preferentially used to fertilize in vivo. Here, we showed for the first time that the deletion, even partial, of the sperm Itgb1 gene makes the sperm unable to normally fertilize oocytes. However, to elucidate the question of the essentiality of its role during fertilization, further investigations using a mouse expressing a recombinase more effective in male germ cells are necessary.
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Affiliation(s)
- Virginie Barraud-Lange
- Institut Cochin, Université de Paris, INSERM, CNRS, F-75014 Paris, France; (V.B.-L.); (C.I.-R.); (C.C.); (I.H.); (J.-P.W.); (S.B.)
- Service d’Histologie, d’Embryologie, Biologie de la Reproduction, AP-HP, Hôpital Cochin, F-75014 Paris, France
| | - Côme Ialy-Radio
- Institut Cochin, Université de Paris, INSERM, CNRS, F-75014 Paris, France; (V.B.-L.); (C.I.-R.); (C.C.); (I.H.); (J.-P.W.); (S.B.)
| | - Céline Chalas
- Institut Cochin, Université de Paris, INSERM, CNRS, F-75014 Paris, France; (V.B.-L.); (C.I.-R.); (C.C.); (I.H.); (J.-P.W.); (S.B.)
- Service d’Histologie, d’Embryologie, Biologie de la Reproduction, AP-HP, Hôpital Cochin, F-75014 Paris, France
| | - Isabelle Holtzmann
- Institut Cochin, Université de Paris, INSERM, CNRS, F-75014 Paris, France; (V.B.-L.); (C.I.-R.); (C.C.); (I.H.); (J.-P.W.); (S.B.)
| | - Jean-Philippe Wolf
- Institut Cochin, Université de Paris, INSERM, CNRS, F-75014 Paris, France; (V.B.-L.); (C.I.-R.); (C.C.); (I.H.); (J.-P.W.); (S.B.)
- Service d’Histologie, d’Embryologie, Biologie de la Reproduction, AP-HP, Hôpital Cochin, F-75014 Paris, France
| | - Sandrine Barbaux
- Institut Cochin, Université de Paris, INSERM, CNRS, F-75014 Paris, France; (V.B.-L.); (C.I.-R.); (C.C.); (I.H.); (J.-P.W.); (S.B.)
| | - Ahmed Ziyyat
- Institut Cochin, Université de Paris, INSERM, CNRS, F-75014 Paris, France; (V.B.-L.); (C.I.-R.); (C.C.); (I.H.); (J.-P.W.); (S.B.)
- Service d’Histologie, d’Embryologie, Biologie de la Reproduction, AP-HP, Hôpital Cochin, F-75014 Paris, France
- Correspondence:
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Bernabò N, Ordinelli A, Di Agostino R, Mattioli M, Barboni B. Network analyses of sperm-egg recognition and binding: ready to rethink fertility mechanisms? OMICS-A JOURNAL OF INTEGRATIVE BIOLOGY 2015; 18:740-53. [PMID: 25454512 DOI: 10.1089/omi.2014.0128] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
The rapid growth of published literature makes biomedical text mining increasingly invaluable for unpacking implicit knowledge hidden in unstructured text. We employed biomedical text mining and biological networks analyses to research the process of sperm egg recognition and binding (SERB). We selected from the literature the molecules expressed either on spermatozoa or on oocytes thought to be involved in SERB and, using an automated literature search software (Agilent Literature Search), we realized a network, SERBN, characterized by a hierarchical scale free and a small world topology. We used an integrated approach, either based on selection of hubs or by a cluster analysis, to discern the key molecules of SERB. We found that in most cases some of them are not directly situated on spermatozoa and oocyte, but are dispersed in oviductal fluid or embedded in exosomes present in the perivitelline space. To confirm and validate our results, we performed further analyses using STRING and Reactome FI software. Our findings underscore that the fertility is not a property of gametes in isolation, but rather depends on the functional integrity of the entire reproductive system. These observations collectively underscore the importance of integrative biology in exploring biological systems and in rethinking of fertility mechanisms in the light of this innovative approach.
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Affiliation(s)
- Nicola Bernabò
- Faculty of Veterinary Medicine, University of Teramo , Teramo, Italy
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Saavedra MD, Mondéjar I, Coy P, Betancourt M, González-Márquez H, Jiménez-Movilla M, Avilés M, Romar R. Calreticulin from suboolemmal vesicles affects membrane regulation of polyspermy. Reproduction 2014; 147:369-78. [DOI: 10.1530/rep-13-0454] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
This study was designed to determine whether calreticulin (CRT), a chaperone protein, is present in in vitro-matured (IVM) pig oocytes and to study its potential role in the block to polyspermy. Western blot analysis, using an anti-CRT antibody, of oocyte lysate showed an immunoreactive band of ∼60 kDa. Simultaneous labeling of IVM oocytes with anti-CRT antibody and peanut agglutinin lectin (PNA lectin, a porcine cortical granules (CG)-specific binding lectin) revealed localization of CRT in the subplasmalemmal region with a 27.7% colocalization with PNA staining. After IVF, PNA labeling was not observed and anti-CRT labeling decreased significantly in zygotes and disappeared in two-cell embryos. Western blot analysis of oocyte exudate obtained from zona pellucida (ZP)-free oocytes activated with calcium ionophore confirmed the presence of a band that reacted with an anti-CRT antibody. Anti-CRT antibody and PNA labeling were not observed in activated oocytes despite being detectable in non-activated oocytes. The presence of CRT in vesicles located under the oolemma was demonstrated using immunogold cytochemistry at the ultrastructural level. To study the role of CRT in fertilization, ZP-enclosed and ZP-free oocytes were incubated with exogenous CRT and then inseminated. Whereas ZP-free oocytes showed fewer penetrating sperm and lower polyspermy rates than untreated oocytes, the opposite effect was observed in ZP-enclosed oocytes. In conclusion, CRT is confined to subplasmalemmal vesicles partially overlapping with CG contents. Its exocytosis after the oocyte activation seems to participate in the membrane block to polyspermy in pigs but is not involved in the ZP block.
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Tapia S, Rojas M, Morales P, Ramirez MA, Diaz ES. The Laminin-Induced Acrosome Reaction in Human Sperm Is Mediated by Src Kinases and the Proteasome1. Biol Reprod 2011; 85:357-66. [DOI: 10.1095/biolreprod.111.092254] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
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Wang L, Chen W, Zhao C, Huo R, Guo XJ, Lin M, Huang XY, Mao YD, Zhou ZM, Sha JH. The role of ezrin-associated protein network in human sperm capacitation. Asian J Androl 2010; 12:667-76. [PMID: 20711218 PMCID: PMC3739321 DOI: 10.1038/aja.2010.79] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2010] [Revised: 04/28/2010] [Accepted: 06/11/2010] [Indexed: 11/09/2022] Open
Abstract
Membrane modifications in sperm cells represent a key step in sperm capacitation; however, the molecular basis of these modifications is not fully understood. Ezrin is the best-studied member of the ezrin/radixin/merlin family. As a cross-linker between the cortical cytoskeleton and plasma membrane proteins, ezrin contributes to remodeling of the membrane surface structure. Furthermore, activated ezrin and the Rho dissociation inhibitor, RhoGDI, promote the formation of cortical cytoskeleton-polymerized actin through Rho activation. Thus, ezrin, actin, RhoGDI, Rho and plasma membrane proteins form a complicated network in vivo, which contributes to the assembly of the structure of the membrane surface. Previously, we showed that ezrin and RhoGDI1 are expressed in human testes. Thus, we sought to determine whether the ezrin-RhoGDI1-actin-membrane protein network has a role in human sperm capacitation. Our results by Western blot indicate that ezrin is activated by phosphorylation of the threonine567 residue during capacitation. Co-immunoprecipitation studies revealed that, during sperm capacitation, the interaction between ezrin and RhoGDI1 increases, and phosphostaining of two dimensional electrophoresis gels showed that RhoGDI1 is phosphorylated, suggesting that RhoGDI1 dissociates from RhoA and leads to actin polymerization on the sperm head. We speculate that activated ezrin interacts with polymerized actin and the glycosylated membrane protein cd44 after capacitation. Blocking sperm capacitation using ezrin- or actin-specific monoclonal antibodies decreases their acrosome reaction (AR) rate, but has no effect on the AR alone. Taken together, our results show that a network consisting of ezrin, RhoGDI1, RhoA, F-actin and membrane proteins functions to influence the modifications that occur on the membrane of the sperm head during human sperm capacitation.
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Affiliation(s)
- Lei Wang
- Laboratory of Reproductive Medicine, Department of Histology and Embryology, Nanjing Medical University, Nanjing 210029, China
| | - Wen Chen
- Laboratory of Reproductive Medicine, Department of Histology and Embryology, Nanjing Medical University, Nanjing 210029, China
| | - Chun Zhao
- Laboratory of Reproductive Medicine, Department of Histology and Embryology, Nanjing Medical University, Nanjing 210029, China
| | - Ran Huo
- Laboratory of Reproductive Medicine, Department of Histology and Embryology, Nanjing Medical University, Nanjing 210029, China
| | - Xue-Jiang Guo
- Laboratory of Reproductive Medicine, Department of Histology and Embryology, Nanjing Medical University, Nanjing 210029, China
| | - Min Lin
- Laboratory of Reproductive Medicine, Department of Histology and Embryology, Nanjing Medical University, Nanjing 210029, China
| | - Xiao-Yan Huang
- Laboratory of Reproductive Medicine, Department of Histology and Embryology, Nanjing Medical University, Nanjing 210029, China
| | - Yun-Dong Mao
- Laboratory of Reproductive Medicine, Department of Histology and Embryology, Nanjing Medical University, Nanjing 210029, China
- Department of Reproductive Medicine, the First Affiliated Hospital of Nanjing Medical University, Nanjing 210029, China
| | - Zuo-Min Zhou
- Laboratory of Reproductive Medicine, Department of Histology and Embryology, Nanjing Medical University, Nanjing 210029, China
| | - Jia-Hao Sha
- Laboratory of Reproductive Medicine, Department of Histology and Embryology, Nanjing Medical University, Nanjing 210029, China
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Diaz ES, Kong M, Morales P. Effect of fibronectin on proteasome activity, acrosome reaction, tyrosine phosphorylation and intracellular calcium concentrations of human sperm. Hum Reprod 2007; 22:1420-30. [PMID: 17347169 DOI: 10.1093/humrep/dem023] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
BACKGROUND Previously we showed that the human sperm proteasome plays significant roles during mammalian fertilization. Here we studied the effect of fibronectin (Fn), an extracellular matrix protein present in the cumulus oophorus of the oocyte, on proteasome activity, acrosome reaction, intracellular calcium concentration ([Ca(2+)](i)) and protein tyrosine phosphorylation of human sperm. METHODS Aliquots of motile sperm were incubated for 15 min (T0), 5 h (T5) and 18 h (T18), at 37 degrees C, 5% CO(2) and 95% air with Fn (0-100 microg/ml). The chymotrypsin- and trypsin-like activity of the proteasome was measured using the fluorogenic substrates, Suc-Leu-Leu-Val-Tyr-AMC and Boc-Gln-Ala-Arg-AMC, respectively. At T18, sperm aliquots were incubated for 15 min with Fn and/or progesterone in the presence or absence of epoxomicin (a proteasome inhibitor). The percentage of viable acrosome reacted sperm was evaluated using the Fluorescein isothiocyanate (FITC)-labeled Pisum sativum agglutinin. Tyrosine phosphorylation was evaluated by western blot and [Ca(2+)](i) using fura 2. RESULTS Fn stimulated both enzymatic activities of the proteasome and the acrosome reaction of human sperm. Progesterone enhanced and epoxomicin drastically inhibited the effect of Fn. Fn treatment also increased the [Ca(2+)](i). Western blot analysis revealed that Fn increased tyrosine protein phosphorylation and that some proteasome subunits became tyrosine phosphorylated upon Fn treatment. CONCLUSIONS These results suggest that Fn activates the proteasome and induces the acrosome reaction in human sperm. This effect may involve binding with specific receptors (integrins) on the sperm surface and the activation of tyrosine kinases.
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Affiliation(s)
- Emilce S Diaz
- Department of Biomedicine, University of Antofagasta, Antofagasta, Chile
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Spinaci M, Volpe S, Bernardini C, De Ambrogi M, Tamanini C, Seren E, Galeati G. Immunolocalization of heat shock protein 70 (Hsp 70) in boar spermatozoa and its role during fertilization. Mol Reprod Dev 2005; 72:534-41. [PMID: 16142794 DOI: 10.1002/mrd.20367] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The presence and cellular distribution of heat protein 70 (Hsp70) in ejaculated, capacitated, and acrosome-reacted boar spermatozoa was evaluated by immunofluorescence and Western blot; the role of Hsp70 during fertilization was also studied. In freshly ejaculated spermatozoa, Hsp70 immunoreactivity is present in a well-defined triangular-shaped area in the equatorial segment that seems to correspond to the equatorial sub-segment. The distribution of the fluorescent signal changes in capacitated sperm, that exhibit different patterns probably in relation to the stage of capacitation of individual cells; after acrosome reaction Hsp70 immunoreactivity is localized on both a thick sub-equatorial band and a triangle in the equatorial segment. In reacted spermatozoa, Hsp70 seems to be not only relocalized but also translocated from the inner to the outer leaflet of the sperm plasma membrane, as a significant (P < 0.05) increase in the proportion of unfixed cells showing the fluorescent signal has been recorded. No differences in Hsp70 amount between fresh, capacitated, and reacted semen were observed by Western blot. The presence of anti-Hsp70 antibody in the fertilization medium significantly reduced, in a concentration-dependent manner, the fertilization rate of both zona-intact and zona-free oocytes. The overall data demonstrate that Hsp70 is present on boar sperm with a dynamic redistribution as the sperm undergoes capacitation and acrosome reaction and suggest an important role of this protein during porcine gamete interaction.
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Affiliation(s)
- Marcella Spinaci
- Dipartimento di Morfofisiologia Veterinaria e Produzioni Animali, Facoltà di Medicina Veterinaria, Università di Bologna, Ozzano Emilia, Italia.
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