1
|
Slaby S, Hanotel J, Marchand G, Lescuyer A, Bodart JF, Leprêtre A, Lemière S, Marin M. Maturation of Xenopus laevis oocytes under cadmium and lead exposures: Cell biology investigations. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2017; 193:105-110. [PMID: 29053961 DOI: 10.1016/j.aquatox.2017.10.009] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2017] [Revised: 09/25/2017] [Accepted: 10/14/2017] [Indexed: 06/07/2023]
Abstract
Since amphibians are recognised as good models to assess the quality of environments, only few studies have dealt with the impacts of chemical contaminants on their gametes, while toxic effects at this stage will alter all the next steps of their life cycle. Therefore, we propose to investigate the oocyte maturation of Xenopus laevis in cadmium- and lead-contaminated conditions. The impacts of cadmium and lead ions were explored on events involved in the hormone-dependent process of maturation. In time-course experiments, cadmium, at the highest concentration, delayed and prevented the germinal vesicle breakdown. Even in the absence of progesterone this ion could also induce it. No such spontaneous maturation was observed after lead exposures. An acceleration of the process at the highest tested concentration of lead (90μM), in presence of progesterone, was recorded. Cytological observations highlighted that cadmium exposures drove severe disturbances of meiotic spindle morphogenesis. At last, cadmium exposures altered the MAPK pathway, regarding the activation of ERK2 and RSK, but also the activation and the activity of the MPF, by disturbing the state of phosphorylation of Cdc2 and histone H3. Xenopus laevis oocytes were affected by these metal ion exposures, notably by Cd2+. Signatures of these metal exposures on the oocyte maturation were detected. This germ cell appeared to be a relevant model to assess the effects of environmental contaminants such as metals.
Collapse
Affiliation(s)
- Sylvain Slaby
- Univ. Lille, CNRS, INRA, UMR 8576-UGSF - Unité de Glycobiologie Structurale et Fonctionnelle, F-59000 Lille, France; Univ. Lille, EA 4515-LGCgE - Laboratoire Génie Civil et géo-Environnement, Cité scientifique, SN3, F-59655 Villeneuve d'Ascq, France
| | - Julie Hanotel
- Univ. Lille, CNRS, INRA, UMR 8576-UGSF - Unité de Glycobiologie Structurale et Fonctionnelle, F-59000 Lille, France
| | - Guillaume Marchand
- Univ. Lille, CNRS, INRA, UMR 8576-UGSF - Unité de Glycobiologie Structurale et Fonctionnelle, F-59000 Lille, France
| | - Arlette Lescuyer
- Univ. Lille, CNRS, INRA, UMR 8576-UGSF - Unité de Glycobiologie Structurale et Fonctionnelle, F-59000 Lille, France
| | - Jean-François Bodart
- Univ. Lille, CNRS, INRA, UMR 8576-UGSF - Unité de Glycobiologie Structurale et Fonctionnelle, F-59000 Lille, France
| | - Alain Leprêtre
- Univ. Lille, EA 4515-LGCgE - Laboratoire Génie Civil et géo-Environnement, Cité scientifique, SN3, F-59655 Villeneuve d'Ascq, France
| | - Sébastien Lemière
- Univ. Lille, EA 4515-LGCgE - Laboratoire Génie Civil et géo-Environnement, Cité scientifique, SN3, F-59655 Villeneuve d'Ascq, France
| | - Matthieu Marin
- Univ. Lille, CNRS, INRA, UMR 8576-UGSF - Unité de Glycobiologie Structurale et Fonctionnelle, F-59000 Lille, France.
| |
Collapse
|
2
|
Gelaude A, Marin M, Cailliau K, Jeseta M, Lescuyer‐Rousseau A, Vandame P, Nevoral J, Sedmikova M, Martoriati A, Bodart J. Nitric Oxide Donor
s
‐Nitroso‐
n
‐Acetyl Penicillamine (SNAP) Alters Meiotic Spindle Morphogenesis in
Xenopus
Oocytes. J Cell Biochem 2015; 116:2445-54. [DOI: 10.1002/jcb.25211] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2015] [Accepted: 04/22/2015] [Indexed: 11/12/2022]
Affiliation(s)
- Armance Gelaude
- Université Lillel, Sciences et TechnologiesRégulation des Signaux de Division Team, UMR 8576 CNRS, FR3688 CNRSVilleneuve dAscqFrance
| | - Matthieu Marin
- Université Lillel, Sciences et TechnologiesRégulation des Signaux de Division Team, UMR 8576 CNRS, FR3688 CNRSVilleneuve dAscqFrance
| | - Katia Cailliau
- Université Lillel, Sciences et TechnologiesRégulation des Signaux de Division Team, UMR 8576 CNRS, FR3688 CNRSVilleneuve dAscqFrance
| | - Michal Jeseta
- Veterinary Research InstituteBrno ‐ Genetics and ReproductionBrnoCzech Republic
| | - Arlette Lescuyer‐Rousseau
- Université Lillel, Sciences et TechnologiesRégulation des Signaux de Division Team, UMR 8576 CNRS, FR3688 CNRSVilleneuve dAscqFrance
| | - Pauline Vandame
- Université Lillel, Sciences et TechnologiesRégulation des Signaux de Division Team, UMR 8576 CNRS, FR3688 CNRSVilleneuve dAscqFrance
| | - Jan Nevoral
- Czech University of Life Sciences in PragueFaculty of AgrobiologyFood and Natural Resources, Department of Veterinary SciencesPragueCzech Republic
| | - Marketa Sedmikova
- Czech University of Life Sciences in PragueFaculty of AgrobiologyFood and Natural Resources, Department of Veterinary SciencesPragueCzech Republic
| | - Alain Martoriati
- Université Lillel, Sciences et TechnologiesRégulation des Signaux de Division Team, UMR 8576 CNRS, FR3688 CNRSVilleneuve dAscqFrance
| | - Jean‐François Bodart
- Université Lillel, Sciences et TechnologiesRégulation des Signaux de Division Team, UMR 8576 CNRS, FR3688 CNRSVilleneuve dAscqFrance
| |
Collapse
|
3
|
Jeseta M, Marin M, Tichovska H, Melicharova P, Cailliau-Maggio K, Martoriati A, Lescuyer-Rousseau A, Beaujois R, Petr J, Sedmikova M, Bodart JF. Nitric oxide-donor SNAP induces Xenopus eggs activation. PLoS One 2012; 7:e41509. [PMID: 22911804 PMCID: PMC3402422 DOI: 10.1371/journal.pone.0041509] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2012] [Accepted: 06/22/2012] [Indexed: 12/11/2022] Open
Abstract
Nitric oxide (NO) is identified as a signaling molecule involved in many cellular or physiological functions including meiotic maturation and parthenogenetic activation of mammalian oocytes. We observed that nitric oxide donor SNAP was potent to induce parthenogenetic activation in Xenopus eggs. NO-scavenger CPTIO impaired the effects of SNAP, providing evidence for the effects of the latter to be specific upon NO release. In Xenopus eggs, SNAP treatment induced pigment rearrangement, pronucleus formation and exocytosis of cortical granules. At a biochemical level, SNAP exposure lead to MAPK and Rsk inactivation within 30 minutes whereas MPF remained active, in contrast to calcium ionophore control where MPF activity dropped rapidly. MAPK inactivation could be correlated to pronuclear envelope reformation observed. In SNAP-treated eggs, a strong increase in intracellular calcium level was observed. NO effects were impaired in calcium-free or calcium limited medium, suggesting that that parthenogenetic activation of Xenopus oocytes with a NO donor was mainly calcium-dependent.
Collapse
Affiliation(s)
- Michal Jeseta
- Veterinary Research Institute, Department of Genetics and Reproduction, Brno, Czech Republic.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
4
|
Russo C, Beaujois R, Bodart JF, Blossey R. Kicked by Mos and tuned by MPF-the initiation of the MAPK cascade in Xenopus oocytes. HFSP JOURNAL 2009; 3:428-40. [PMID: 20514133 DOI: 10.2976/1.3265771] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2009] [Accepted: 09/24/2009] [Indexed: 11/19/2022]
Abstract
The mitogen-activated protein kinase (MAPK) cascade is a paradigmatic signaling cascade, which plays a crucial role in many aspects of cellular events. The main initiator of the cascade in Xenopus oocytes is the oncoprotein Mos. After activation of the cascade, Mos activity is stabilized by MAPK via a feedback loop. Mos concentration levels are, however, not controlled by MAPK alone. In this paper we show, by imposing either a sustained or a peaked activity of M-phase promoting factor (MPF) (Cdc2-cyclin B), how the latter regulates the dynamics of Mos. Our experiments are supported by a detailed kinetic model for the Mos-MPF-MAPK network, which takes into account the three different phosphorylation states of Mos and, as a consequence, allows us to determine the time evolution of Mos under control of MPF. Our work opens a path toward a more complete and biologically realistic quantitative understanding of the dynamic interdependence of Mos and MPF in Xenopus oocytes.
Collapse
|
5
|
Sellier C, Bodart JF, Flament S, Baert F, Gannon J, Vilain JP. Intracellular acidification delays hormonal G2/M transition and inhibits G2/M transition triggered by thiophosphorylated MAPK in Xenopus oocytes. J Cell Biochem 2006; 98:287-300. [PMID: 16408274 DOI: 10.1002/jcb.20764] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Xenopus oocyte maturation is analogous to G2/M transition and characterized by germinal vesicle breakdown (GVBD), spindle formation, activation of MPF and Mos-Xp42(Mpk1) pathways. It is accompanied prior to GVBD by a transient increase in intracellular pH. We determined that a well known acidifying compound, NH(4)Cl, delayed progesterone-induced GVBD in a dose-dependent manner. GVBD(50) was delayed up to 2.3-fold by 10 mM NH(4)Cl. Cyclin B2 phosphorylation, Cdk1 Tyr15 dephosphorylation as well as p39(Mos) accumulation, Xp42(Mpk1) and p90(Rsk) phosphorylation induced by progesterone were also delayed by incubation of oocyte in NH(4)Cl. The delay induced by NH(4)Cl was prevented by injection of MOPS buffer pH 7.7. In contrast to acidifying medium, alkalyzing treatment such as Tris buffer pH 9 injections, accelerated GVBD, MPF and Xp42(Mpk1) activation, indicating that pHi changes control early steps of G2/M dynamics. When injected in an immature recipient oocyte, egg cytoplasm triggers GVBD through MPF auto-amplification, independently of protein synthesis. In these conditions, GVBD and Xp42(Mpk1) activation were delayed by high concentration of NH(4)Cl, which never prevented or delayed MPF activation. Strickingly, NH(4)Cl strongly inhibited thiophosphorylated active MAPK-induced GVBD and MPF activation. Nevertheless, Tris pH 9 did not have any effects on egg cytoplasm- or active MAPK-induced GVBD. Taken together, our results suggest that dynamic of early events driving Xp42(Mpk1) and MPF activation induced by progesterone may be negatively or positively regulated by pH(i) changes. However Xp42(Mpk1) pathway was inhibited by acidification alone. Finally, MPF auto-amplification loop was not sensitive to pH(i) changes.
Collapse
Affiliation(s)
- C Sellier
- Laboratoire de Biologie du Développement, EA 1033, IFR 118, Université des Sciences et Technologies de Lille, SN3, Villeneuve d'Ascq, France
| | | | | | | | | | | |
Collapse
|
6
|
Abstract
In meiotic cell cycles, meiosis I (MI) is followed by meiosis II (MII) without an intervening S phase, whereas in mitotic cell cycles, an S phase necessarily alternates with an M phase. For the study of mitotic cell cycles, extracts prepared from unfertilized and parthenogenetically activated Xenopus eggs have been very useful as they can perform the progression of mitotic cycles in vitro. To establish a cell-free system to study the regulatory mechanisms of meiotic transition from MI to MII, extracts have been prepared from maturing Xenopus oocytes isolated from ovaries, stimulated with progesterone to induce the resumption of meiosis, and arrested at meiotic metaphase I by cold treatment. In oocyte extracts, the activity of cyclin B-Cdc2 complexes, the M phase inducer, fluctuates in the same manner as it does in maturing oocytes during the MI to MII transition period. By the use of oocyte extracts, it has been found that incomplete inactivation of Cdc2 at the end of MI is required for meiotic M-M transition. The meiotic extract should provide a useful tool to elucidate molecular mechanisms of meiotic M to M transition, including a role of Mos/mitogen-activated protein kinase cascade in the suppression of S phase entry after MI exit. In this chapter, we describe methods for the preparation and the uses of meiotic extracts. As a comparison, we also include a protocol for the preparation of mitotic extracts.
Collapse
Affiliation(s)
- Keita Ohsumi
- Laboratory of Cell and Developmental Biology, Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology, Yokohama, Japan
| | | | | |
Collapse
|
7
|
Baert F, Bodart JF, Bocquet-Muchembled B, Lescuyer-Rousseau A, Vilain JP. Xp42(Mpk1) activation is not required for germinal vesicle breakdown but for Raf complete phosphorylation in insulin-stimulated Xenopus oocytes. J Biol Chem 2003; 278:49714-20. [PMID: 14507918 DOI: 10.1074/jbc.m308067200] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Fully grown G2-arrested Xenopus oocytes resume meiosis in vitro upon exposure to hormonal stimulation. Progesterone triggers oocyte meiosis resumption through a Ras-independent pathway that involves a p39Mos-dependent activation of the mitogen-activated protein (MAP) kinases. Insulin also triggers meiosis resumption through a tyrosine kinase receptor that activates a Ras-dependent pathway leading to the MAP kinases activation. Antisense phosphorothioate oligonucleotides were used to prevent p39Mos accumulation and Erk-like Xp42(Mpk1) activation during insulin-induced Xenopus oocytes maturation. In contrast to previous works, prevention of p39Mos-induced activation of Xp42(Mpk1) in insulin-treated oocytes did not inhibit but delayed meiotic resumption, like in progesterone-stimulated oocytes. Activations of Xp42(Mpk1), the unique Erk of the oocyte, and of its downstream target p90Rsk, were impaired and phosphorylation of the MAPKK kinase Raf was partially inhibited. Similarly, oocytes treated with the MEK inhibitor U0126, stimulated by insulin exhibited delayed germinal vesicle breakdown, absence of Xp42(Mpk1) activation, and partial phosphorylation of Raf. To summarize, whereas p39Mos-induced activation of MEK/MAPK pathway is dispensable for insulin-induced germinal vesicle breakdown, Xp42(Mpk1) activation induced by insulin is dependent upon p39Mos synthesis. Raf complete phosphorylation appears to require the MEK/MAPK pathway activation both in progesterone and insulin-stimulated oocytes.
Collapse
Affiliation(s)
- Frédéric Baert
- Laboratoire de Biologie du Développement UPRES-EA1033, Bâtiment SN3, IFR118, Université des Sciences et Technologies de Lille, 59655 Villeneuve d'Ascq, France
| | | | | | | | | |
Collapse
|
8
|
Fan HY, Tong C, Lian L, Li SW, Gao WX, Cheng Y, Chen DY, Schatten H, Sun QY. Characterization of ribosomal S6 protein kinase p90rsk during meiotic maturation and fertilization in pig oocytes: mitogen-activated protein kinase-associated activation and localization. Biol Reprod 2003; 68:968-77. [PMID: 12604650 DOI: 10.1095/biolreprod.102.008839] [Citation(s) in RCA: 42] [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
Mitogen-activated protein kinase (MAPK) becomes activated during the meiotic maturation of pig oocytes, but its physiological substrate is unknown. The 90-kDa ribosome S6 protein kinase (p90rsk) is the best known MAPK substrate in Xenopus and mouse oocytes. The present study was designed to investigate the expression, phosphorylation, subcellular localization, and possible roles of p90rsk in porcine oocytes during meiotic maturation, fertilization, and parthenogenetic activation. This kinase was partially phosphorylated in oocytes at germinal vesicle (GV) stage through a MAPK-independent mechanism, but its full phosphorylation is dependent on MAPK activity. After fertilization or electrical activation, p90rsk was dephosphorylated shortly before pronucleus formation, which coincided with the inactivation of MAPK. A protein phosphatase inhibitor, okadaic acid, accelerated the phosphorylation of p90rsk during meiotic maturation and induced its rephosphorylation in activated eggs. MAPK kinase (MAPKK or MEK) inhibitor U0126 inhibited the activation of MAPK and p90rsk in both cumulus-enclosed and denuded pig oocytes, but prevented GV breakdown (GVBD) only in cumulus-enclosed oocytes. Active MAPK and p90rsk were detected in pig cumulus cells, and U0126 induced their dephosphorylation. In meiosis II arrested eggs, U0126 led to the inactivation of MAPK and p90rsk, as well as the interphase transition of the eggs. P90rsk was distributed evenly in GV oocytes, but it accumulated in the nucleus before GVBD. It was localized to the meiotic spindle after GVBD and concentrated in the spindle mid zone during emission of the polar bodies. All these results suggest that p90rsk is downstream of MAPK and plays functional roles in the regulation of nuclear status and microtubule organization. Although MAPK and p90rsk activity are not essential for the spontaneous meiotic resumption in denuded oocytes, activation of this cascade in cumulus cells is indispensable for the gonadotropin-induced meiotic resumption of pig oocytes.
Collapse
Affiliation(s)
- Heng-Yu Fan
- State Key Laboratory of Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing 100080, People's Republic of China
| | | | | | | | | | | | | | | | | |
Collapse
|