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Lefebvre M, Razakandrainibe R, Schapman D, François A, Genty D, Galas L, Villena I, Favennec L, Costa D. Interactions between free-living amoebae and Cryptosporidium parvum: an experimental study. Parasite 2023; 30:31. [PMID: 37606589 PMCID: PMC10443459 DOI: 10.1051/parasite/2023033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2023] [Accepted: 08/05/2023] [Indexed: 08/23/2023] Open
Abstract
Free-Living Amebae (FLA) and Cryptosporidium oocysts occasionally share the same environment. From 2004 to 2016, Cryptosporidium was responsible for 60% of 905 worldwide waterborne outbreaks caused by protozoan parasites. The aim of this study was to evaluate interactions between C. parvum oocysts and two common FLAs (Acanthamoeba castellanii and Vermamoeba vermiformis) in a water environment. Encystment and survival of FLAs were evaluated by microscopy using trypan blue vital coloration. Oocysts were numerated on microscopy. Interactions were studied over time in conditions both unfavorable and favorable to phagocytosis. Potential phagocytosis was directly evaluated by several microscopic approaches and indirectly by numeration of microorganisms and oocyst infectivity evaluation. Occasional phagocytosis of C. parvum by FLAs was documented. However, oocyst concentrations did not decrease significantly, suggesting resistance of oocysts to phagocytosis. A temporary decrease of oocyst infectivity was observed in the presence of A. castellanii. The effect of these interactions on C. parvum infectivity is particularly interesting. The biofilm condition could favor the persistence or even the proliferation of oocysts over time. This study demonstrated interactions between C. parvum and FLAs. Further knowledge of the mechanisms involved in the decrease of oocyst infectivity in the presence of A. castellanii could facilitate the development of new therapeutic approaches.
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Affiliation(s)
- Marion Lefebvre
- Univ Rouen Normandie, Laboratory of Parasitology-Mycology, EA7510 ESCAPE, University hospital of Rouen Normandie 76000 Rouen France
| | - Romy Razakandrainibe
- Univ Rouen Normandie, Laboratory of Parasitology-Mycology, EA7510 ESCAPE, University hospital of Rouen Normandie 76000 Rouen France
- National Reference Center Cryptosporidiosis, microsporidia and other protozoa, University Hospital of Rouen Normandie 76000 Rouen France
| | - Damien Schapman
- Univ Rouen Normandie, INSERM, CNRS, HeRacLeS US 51 UAR 2026, PRIMACEN 76000 Rouen France
| | - Arnaud François
- Univ Rouen Normandie, Laboratory of Parasitology-Mycology, EA7510 ESCAPE, University hospital of Rouen Normandie 76000 Rouen France
- Department of anathomopathology, University Hospital of Rouen Normandie 76000 Rouen France
| | - Damien Genty
- Department of anathomopathology, University Hospital of Rouen Normandie 76000 Rouen France
| | - Ludovic Galas
- Univ Rouen Normandie, INSERM, CNRS, HeRacLeS US 51 UAR 2026, PRIMACEN 76000 Rouen France
| | - Isabelle Villena
- Reims Champagne-Ardenne University, Laboratory of Parasitology-Mycology, EA7510 ESCAPE 51454 Reims France
| | - Loic Favennec
- Univ Rouen Normandie, Laboratory of Parasitology-Mycology, EA7510 ESCAPE, University hospital of Rouen Normandie 76000 Rouen France
- National Reference Center Cryptosporidiosis, microsporidia and other protozoa, University Hospital of Rouen Normandie 76000 Rouen France
| | - Damien Costa
- Univ Rouen Normandie, Laboratory of Parasitology-Mycology, EA7510 ESCAPE, University hospital of Rouen Normandie 76000 Rouen France
- National Reference Center Cryptosporidiosis, microsporidia and other protozoa, University Hospital of Rouen Normandie 76000 Rouen France
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Brosolo M, Lecointre M, Laquerrière A, Janin F, Genty D, Lebon A, Lesueur C, Vivien D, Marret S, Marguet F, Gonzalez BJ. In utero alcohol exposure impairs vessel-associated positioning and differentiation of oligodendrocytes in the developing neocortex. Neurobiol Dis 2022; 171:105791. [PMID: 35760273 DOI: 10.1016/j.nbd.2022.105791] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2022] [Revised: 05/30/2022] [Accepted: 06/10/2022] [Indexed: 11/16/2022] Open
Abstract
Prenatal alcohol exposure (PAE) is a major cause of nongenetic mental retardation and can lead to fetal alcohol syndrome (FAS), the most severe manifestation of fetal alcohol spectrum disorder (FASD). FASD infants present behavioral disabilities resulting from neurodevelopmental defects. Both grey and white matter lesions have been characterized and are associated with apoptotic death and/or ectopic migration profiles. In the last decade, it was shown that PAE impairs brain angiogenesis, and the radial organization of cortical microvessels is lost. Concurrently, several studies have reported that tangential migration of oligodendrocyte precursors (OPCs) originating from ganglionic eminences is vascular associated. Because numerous migrating oligodendrocytes enter the developing neocortex, the present study aimed to determine whether migrating OPCs interacted with radial cortical microvessels and whether alcohol-induced vascular impairments were associated with altered positioning and differentiation of cortical oligodendrocytes. Using a 3D morphometric analysis, the results revealed that in both human and mouse cortices, 15 to 40% of Olig2-positive cells were in close association with radial cortical microvessels, respectively. Despite perinatal vascular disorganization, PAE did not modify the vessel association of Olig2-positive cells but impaired their positioning between deep and superficial cortical layers. At the molecular level, PAE markedly but transiently reduced the expression of CNPase and MBP, two differentiation markers of immature and mature oligodendrocytes. In particular, PAE inverted their distribution profiles in cortical layers V and VI and reduced the thickness of the myelin sheath of efferent axons. These perinatal oligo-vascular defects were associated with motor disabilities that persisted in adults. Altogether, the present study provides the first evidence that Olig2-positive cells entering the neocortex are associated with radial microvessels. PAE disorganized the cortical microvasculature and delayed the positioning and differentiation of oligodendrocytes. Although most of these oligovascular defects occurred in perinatal life, the offspring developed long-term motor troubles. Altogether, these data suggest that alcohol-induced oligo-vascular impairments contribute to the neurodevelopmental issues described in FASD.
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Affiliation(s)
- M Brosolo
- Normandie Univ, UNIROUEN, INSERM U1245, Normandy Centre for Genomic and Personalized Medicine, F 76000 Rouen, France
| | - M Lecointre
- Normandie Univ, UNIROUEN, INSERM U1245, Normandy Centre for Genomic and Personalized Medicine, F 76000 Rouen, France
| | - A Laquerrière
- Normandie Univ, UNIROUEN, INSERM U1245, Normandy Centre for Genomic and Personalized Medicine, F 76000 Rouen, France; Department of Pathology, Rouen University Hospital, 76000 Rouen, France
| | - F Janin
- Normandie Univ, UNIROUEN, INSERM U1245, Normandy Centre for Genomic and Personalized Medicine, F 76000 Rouen, France
| | - D Genty
- Department of Pathology, Rouen University Hospital, 76000 Rouen, France
| | - A Lebon
- Normandie Univ, UNIROUEN, INSERM US 51, CNRS UAR 2026, HeRacLeS-PRIMACEN, 76000 Rouen, France
| | - C Lesueur
- Normandie Univ, UNIROUEN, INSERM U1245, Normandy Centre for Genomic and Personalized Medicine, F 76000 Rouen, France
| | - D Vivien
- Normandie Univ, UNICAEN, INSERM UMR-S U1237, Physiopathology and Imaging of Neurological Disorders (PhIND), GIP Cyceron, Institut Blood and Brain @ Caen-Normandie (BB@C), 14000 Caen, France; Department of Clinical Research, Caen-Normandie University Hospital, CHU, Avenue de la côte de Nacre, Caen, France
| | - S Marret
- Normandie Univ, UNIROUEN, INSERM U1245, Normandy Centre for Genomic and Personalized Medicine, F 76000 Rouen, France; Department of Neonatal Pediatrics and Intensive Care, Rouen University Hospital, 76000 Rouen, France
| | - F Marguet
- Normandie Univ, UNIROUEN, INSERM U1245, Normandy Centre for Genomic and Personalized Medicine, F 76000 Rouen, France; Department of Pathology, Rouen University Hospital, 76000 Rouen, France
| | - B J Gonzalez
- Normandie Univ, UNIROUEN, INSERM U1245, Normandy Centre for Genomic and Personalized Medicine, F 76000 Rouen, France.
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Selim J, Hamzaoui M, Boukhalfa I, Djerada Z, Chevalier L, Piton N, Genty D, Besnier E, Clavier T, Dumesnil A, Renet S, Mulder P, Doguet F, Tamion F, Veber B, Richard V, Baste JM. Cardiopulmonary bypass increases endothelial dysfunction after pulmonary ischaemia-reperfusion in an animal model. Eur J Cardiothorac Surg 2021; 59:1037-1047. [PMID: 33276375 DOI: 10.1093/ejcts/ezaa412] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Revised: 10/06/2020] [Accepted: 10/18/2020] [Indexed: 11/14/2022] Open
Abstract
OBJECTIVES Endothelial dysfunction during ischaemia-reperfusion (IR) is a major cause of primary graft dysfunction during lung transplantation. The routine use of cardiopulmonary bypass (CPB) during lung transplantation remains controversial. However, the contribution of CPB to pulmonary endothelial dysfunction remains unclear. The objective was to investigate the impact of CPB on endothelial dysfunction in a lung IR rat model. METHODS Rats were allocated to 4 groups: (i) Sham, (ii) IR, (iii) CPB and (iv) IR-CPB. The primary outcome was the study of pulmonary vascular reactivity by wire myograph. We also assessed glycocalyx degradation by enzyme-linked immunosorbent assay and electron microscopy and both systemic and pulmonary inflammation by enzyme-linked immunosorbent assay and immunohistochemistry. Rats were exposed to 45 min of CPB and IR. We used a CPB model allowing femoro-femoral support with left pulmonary hilum ischaemia for IR. RESULTS Pulmonary endothelium-dependent relaxation to acetylcholine was markedly reduced in the IR-CPB group (10.7 ± 9.1%) compared to the IR group (50.5 ± 5.2%, P < 0.001), the CPB group (54.1 ± 4.7%, P < 0.001) and the sham group (80.8 ± 6.7%, P < 0.001), suggesting that the association of pulmonary IR and CPB increases endothelial dysfunction. In IR-CPB, IR and CPB groups, vasorelaxation was completely abolished when inhibiting nitric oxide synthase, suggesting that this relaxation process was mainly mediated by nitric oxide. We observed higher syndecan-1 plasma levels in the IR-CPB group in comparison with the other groups, reflecting an increased degradation of glycocalyx. We also observed higher systemic inflammation in the IR-CPB group as shown by the increased plasma levels of IL-1β, IL-10. CONCLUSIONS CPB significantly increased the IR-mediated effects on pulmonary endothelial dysfunction. Therefore, the use of CPB during lung transplantation could be deleterious, by increasing endothelial dysfunction.
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Affiliation(s)
- Jean Selim
- Normandie Univ, UNIVROUEN, INSERM U1096, Rouen, France.,Rouen University Hospital, Department of Anaesthesia and Critical Care, Rouen, France
| | | | | | | | | | - Nicolas Piton
- Rouen University Hospital, Department of Pathology, Rouen, France
| | - Damien Genty
- Rouen University Hospital, Department of Pathology, Rouen, France
| | - Emmanuel Besnier
- Normandie Univ, UNIVROUEN, INSERM U1096, Rouen, France.,Rouen University Hospital, Department of Anaesthesia and Critical Care, Rouen, France
| | - Thomas Clavier
- Normandie Univ, UNIVROUEN, INSERM U1096, Rouen, France.,Rouen University Hospital, Department of Anaesthesia and Critical Care, Rouen, France
| | | | | | - Paul Mulder
- Normandie Univ, UNIVROUEN, INSERM U1096, Rouen, France
| | - Fabien Doguet
- Normandie Univ, UNIVROUEN, INSERM U1096, Rouen, France
| | | | - Benoît Veber
- Rouen University Hospital, Department of Anaesthesia and Critical Care, Rouen, France
| | | | - Jean-Marc Baste
- Normandie Univ, UNIVROUEN, INSERM U1096, Rouen, France.,Rouen University Hospital, Department of Thoracic Surgery, Rouen, France
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Parmentier J, Lejeune S, Maréchal M, Bourges F, Genty D, Terrapon V, Maréchal JC, Gilet T. A drop does not fall in a straight line: a rationale for the width of stalagmites. Proc Math Phys Eng Sci 2019; 475:20190556. [PMID: 31824227 DOI: 10.1098/rspa.2019.0556] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2019] [Accepted: 10/21/2019] [Indexed: 11/12/2022] Open
Abstract
Drops loaded in calcium ions detach from stalactites and impact the underlying stalagmites, thereby allowing these latter to grow through calcite precipitation. Nevertheless, little is known about the influence of the drop free fall and splash dynamics on stalagmite shape and width. Through high-speed imaging of impacting drops on stalagmites from several caves, we observed that the impact point position of the drops is scattered, sometimes over several centimetres. We show that this dispersal has no external cause and must, therefore, be self-induced. Using a Langevin-like equation, we then propose a prediction of the impact point dispersal as a function of the falling height travelled by the drops. We finally show that measured stalagmite widths are correlated to the dispersal in the impact point position of the drop.
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Affiliation(s)
- J Parmentier
- Department of Aerospace and Mechanics, University of Liège, Liège, Belgium
| | - S Lejeune
- Department of Aerospace and Mechanics, University of Liège, Liège, Belgium
| | - M Maréchal
- University of Montpellier, Montpellier, France
| | - F Bourges
- Géologie-Environnement-Conseil, Saint-Girons, France
| | - D Genty
- Environnements et Paléoenvironnements Océaniques et Continentaux, University of Bordeaux, Bordeaux, France
| | - V Terrapon
- Department of Aerospace and Mechanics, University of Liège, Liège, Belgium
| | - J-C Maréchal
- Bureau de Recherches Géologiques et Minières, University of Montpellier, Montpellier, France
| | - T Gilet
- Department of Aerospace and Mechanics, University of Liège, Liège, Belgium
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5
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Chevalier L, Selim J, Genty D, Baste JM, Piton N, Boukhalfa I, Hamzaoui M, Pareige P, Richard V. Electron microscopy approach for the visualization of the epithelial and endothelial glycocalyx. Morphologie 2017; 101:55-63. [PMID: 28506708 DOI: 10.1016/j.morpho.2017.04.001] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2017] [Revised: 04/13/2017] [Accepted: 04/18/2017] [Indexed: 12/17/2022]
Abstract
This study presents a methodological approach for the visualization of the glycocalyx by electron microscopy. The glycocalyx is a three dimensional network mainly composed of glycolipids, glycoproteins and proteoglycans associated with the plasma membrane. Since less than a decade, the epithelial and endothelial glycocalyx proved to play an important role in physiology and pathology, increasing its research interest especially in vascular functions. Therefore, visualization of the glycocalyx requires reliable techniques and its preservation remains challenging due to its fragile and dynamic organization, which is highly sensitive to the different process steps for electron microscopy sampling. In this study, chemical fixation was performed by perfusion as a good alternative to conventional fixation. Additional lanthanum nitrate in the fixative enhances staining of the glycocalyx in transmission electron microscopy bright field and improves its visualization by detecting the elastic scattered electrons, thus providing a chemical contrast.
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Affiliation(s)
- L Chevalier
- Normandie University, Unirouen, INSA Rouen, CNRS, GPM-UMR6634, 76000 Rouen, France.
| | - J Selim
- Inserm, U1096, Normandie University, Unirouen, 76000 Rouen, France
| | - D Genty
- Department of Pathology, Rouen University Hospital, 76000 Rouen, France
| | - J M Baste
- Inserm, U1096, Normandie University, Unirouen, 76000 Rouen, France; Department of Thoracy Surgery, Rouen University Hospital , 76000 Rouen, France
| | - N Piton
- Department of Pathology, Rouen University Hospital, 76000 Rouen, France
| | - I Boukhalfa
- Inserm, U1096, Normandie University, Unirouen, 76000 Rouen, France
| | - M Hamzaoui
- Inserm, U1096, Normandie University, Unirouen, 76000 Rouen, France
| | - P Pareige
- Normandie University, Unirouen, INSA Rouen, CNRS, GPM-UMR6634, 76000 Rouen, France
| | - V Richard
- Inserm, U1096, Normandie University, Unirouen, 76000 Rouen, France
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6
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Roux C, Aligny C, Lesueur C, Girault V, Brunel V, Ramdani Y, Genty D, Driouich A, Laquerrière A, Marret S, Brasse-Lagnel C, Gonzalez BJ, Bekri S. NMDA receptor blockade in the developing cortex induces autophagy-mediated death of immature cortical GABAergic interneurons: An ex vivo and in vivo study in Gad67-GFP mice. Exp Neurol 2015; 267:177-93. [PMID: 25795167 DOI: 10.1016/j.expneurol.2015.02.037] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2014] [Revised: 01/14/2015] [Accepted: 02/05/2015] [Indexed: 01/16/2023]
Abstract
In neonates, excitotoxicity is a major process involved in hypoxic-ischemic brain lesions, and several research groups have suggested the use of NMDA antagonists for neuroprotection. However, despite their clinical interest, there is more and more evidence suggesting that, in the immature brain, these molecules exert deleterious actions on migrating GABAergic interneurons by suppressing glutamatergic trophic inputs. Consequently, preventing the side effects of NMDA antagonists would be therapeutically useful. Because macroautophagy is involved in the adaptive response to trophic deprivation, the aim of the present study was to investigate the impact of autophagy modulators on the MK801-induced death of immature GABAergic interneurons and to characterize the crosstalk between autophagic and apoptotic mechanisms in this cell type. Ex vivo, using cortical slices from NMRI and Gad67-GFP mice, we show that blockade of the NMDA receptor results in an accumulation of autophagosomes due to the disruption of the autophagic flux. This effect precedes the activation of the mitochondrial apoptotic pathway, and the degeneration of immature GABAergic neurons present in developing cortical layers II-IV and is prevented by 3-MA, an autophagy inhibitor. In contrast, modulators of autophagy (3-MA, rapamycin) do not interfere with the anti-excitotoxic and neuroprotective effect of MK801 observed in deep layers V and VI. In vivo, 3-MA blocks the rapid increase in caspase-3 cleavage induced by the blockade of NMDA receptors and prevents the resulting long-term decrease in Gad67-GFP neurons in layers II-IV. Together, these data suggest that, in the developing cortex, the suppression of glutamatergic inputs through NMDA receptor inhibition results in the impairment of the autophagic flux and the subsequent switch to apoptotic death of immature GABAergic interneurons. The concomitant inhibition of autophagy prevents this pro-apoptotic action of the NMDA blocker and favors the long-term rescue of GABAergic interneurons without interfering with its neuroprotective actions. The use of autophagy modulators in the developing brain would create new opportunities to prevent the side effects of NMDA antagonists used for neuroprotection or anesthesia.
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Affiliation(s)
- Christian Roux
- Region-Inserm Team NeoVasc ERI28, Laboratory of Microvascular Endothelium and Neonate Brain Lesions, Institute of Research for Innovation in Biomedicine, Normandy University, Rouen, France
| | - Caroline Aligny
- Region-Inserm Team NeoVasc ERI28, Laboratory of Microvascular Endothelium and Neonate Brain Lesions, Institute of Research for Innovation in Biomedicine, Normandy University, Rouen, France
| | - Céline Lesueur
- Region-Inserm Team NeoVasc ERI28, Laboratory of Microvascular Endothelium and Neonate Brain Lesions, Institute of Research for Innovation in Biomedicine, Normandy University, Rouen, France; Department of Medical Biochemistry, Rouen University Hospital, Rouen, France
| | - Virginie Girault
- Region-Inserm Team NeoVasc ERI28, Laboratory of Microvascular Endothelium and Neonate Brain Lesions, Institute of Research for Innovation in Biomedicine, Normandy University, Rouen, France
| | - Valery Brunel
- Region-Inserm Team NeoVasc ERI28, Laboratory of Microvascular Endothelium and Neonate Brain Lesions, Institute of Research for Innovation in Biomedicine, Normandy University, Rouen, France; Department of Medical Biochemistry, Rouen University Hospital, Rouen, France
| | - Yasmina Ramdani
- Region-Inserm Team NeoVasc ERI28, Laboratory of Microvascular Endothelium and Neonate Brain Lesions, Institute of Research for Innovation in Biomedicine, Normandy University, Rouen, France
| | - Damien Genty
- Department of Pathology, Rouen University Hospital, Rouen, France
| | - Azeddine Driouich
- Research Platform of Cell Imagery (PRIMACEN), France; Laboratory of Glycobiology and Plant Extracellular Matrix (GLYCOMEV) EA 4358, France
| | - Annie Laquerrière
- Region-Inserm Team NeoVasc ERI28, Laboratory of Microvascular Endothelium and Neonate Brain Lesions, Institute of Research for Innovation in Biomedicine, Normandy University, Rouen, France; Department of Pathology, Rouen University Hospital, Rouen, France
| | - Stéphane Marret
- Region-Inserm Team NeoVasc ERI28, Laboratory of Microvascular Endothelium and Neonate Brain Lesions, Institute of Research for Innovation in Biomedicine, Normandy University, Rouen, France; Department of Neonatal Paediatrics and Intensive Care, Rouen University Hospital, Rouen, France
| | - Carole Brasse-Lagnel
- Region-Inserm Team NeoVasc ERI28, Laboratory of Microvascular Endothelium and Neonate Brain Lesions, Institute of Research for Innovation in Biomedicine, Normandy University, Rouen, France; Department of Medical Biochemistry, Rouen University Hospital, Rouen, France
| | - Bruno J Gonzalez
- Region-Inserm Team NeoVasc ERI28, Laboratory of Microvascular Endothelium and Neonate Brain Lesions, Institute of Research for Innovation in Biomedicine, Normandy University, Rouen, France.
| | - Soumeya Bekri
- Region-Inserm Team NeoVasc ERI28, Laboratory of Microvascular Endothelium and Neonate Brain Lesions, Institute of Research for Innovation in Biomedicine, Normandy University, Rouen, France; Department of Medical Biochemistry, Rouen University Hospital, Rouen, France
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7
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Roux C, Lesueur C, Aligny C, Brasse-Lagnel C, Genty D, Marret S, Laquerrière A, Bekri S, Gonzalez BJ. 3-MA Inhibits Autophagy and Favors Long-Term Integration of Grafted Gad67–GFP GABAergic Precursors in the Developing Neocortex by Preventing Apoptosis. Cell Transplant 2014; 23:1425-50. [DOI: 10.3727/096368913x670174] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
In human neonates, immature GABAergic interneurons are markedly affected by an excitotoxic insult. While in adults the interest of cell transplantation has been demonstrated in several neurological disorders, few data are available regarding the immature brain. The low survival rate constitutes a strong limitation in the capacity of transplanted neurons to integrate the host tissue. Because i) autophagy is an adaptive process to energetic/nutrient deprivation essential for cell survival and ii) literature describes cross-talks between autophagy and apoptosis, we hypothesized that regulation of autophagy would represent an original strategy to favor long-term survival of GABAergic precursors grafted in the immature neocortex. Morphological, neurochemical, and functional data showed that in control conditions, few grafted Gad67-GFP precursors survived. The first hours following transplantation were a critical period with intense apoptosis. Experiments performed on E15.5 ganglionic eminences revealed that Gad67-GFP precursors were highly sensitive to autophagy. Rapamycin and 3-MA impacted on LC3 cleavage, LC3II translocation, and autophagosome formation. Quantification of Bax, mitochondrial integrity, caspase-3 cleavage, and caspase-3 immunolocalization and activity showed that 3-MA induced a significant decrease of Gad67-GFP precursor apoptosis. In vivo, 3-MA induced, within the first 24 h, a diffuse LC3 pattern of grafted Gad67-GFP precursors, an increase of precursors with neurites, a reduction of the density of caspase-3 immunoreactive cells. A twofold increase in the survival rate occurred 15 days after the graft. Surviving neurons were localized in the cortical layers II–IV, which were still immature when the transplantation was done. Altogether, these data indicate that inhibition of autophagy represents an original strategy to allow GABAergic interneurons to overpass the first critical hours following transplantation and to increase their long-term survival in mice neonates.
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Affiliation(s)
- Christian Roux
- NeoVasc Laboratory, ERI28, Microvascular Endothelium and Neonate Brain Lesions, Institute of Research for Innovation in Biomedicine, Normandy University, Rouen, France
| | - Céline Lesueur
- NeoVasc Laboratory, ERI28, Microvascular Endothelium and Neonate Brain Lesions, Institute of Research for Innovation in Biomedicine, Normandy University, Rouen, France
- Department of Medical Biochemistry, Rouen University Hospital, Rouen, France
| | - Caroline Aligny
- NeoVasc Laboratory, ERI28, Microvascular Endothelium and Neonate Brain Lesions, Institute of Research for Innovation in Biomedicine, Normandy University, Rouen, France
| | - Carole Brasse-Lagnel
- NeoVasc Laboratory, ERI28, Microvascular Endothelium and Neonate Brain Lesions, Institute of Research for Innovation in Biomedicine, Normandy University, Rouen, France
- Department of Medical Biochemistry, Rouen University Hospital, Rouen, France
| | - Damien Genty
- Department of Pathology, Rouen University Hospital, Rouen, France
| | - Stéphane Marret
- NeoVasc Laboratory, ERI28, Microvascular Endothelium and Neonate Brain Lesions, Institute of Research for Innovation in Biomedicine, Normandy University, Rouen, France
- Department of Neonatal Paediatrics and Intensive Care, Rouen Hospital, Rouen, France
| | - Annie Laquerrière
- NeoVasc Laboratory, ERI28, Microvascular Endothelium and Neonate Brain Lesions, Institute of Research for Innovation in Biomedicine, Normandy University, Rouen, France
- Department of Pathology, Rouen University Hospital, Rouen, France
| | - Soumeya Bekri
- NeoVasc Laboratory, ERI28, Microvascular Endothelium and Neonate Brain Lesions, Institute of Research for Innovation in Biomedicine, Normandy University, Rouen, France
- Department of Medical Biochemistry, Rouen University Hospital, Rouen, France
| | - Bruno J. Gonzalez
- NeoVasc Laboratory, ERI28, Microvascular Endothelium and Neonate Brain Lesions, Institute of Research for Innovation in Biomedicine, Normandy University, Rouen, France
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8
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Bourges F, Genthon P, Genty D, Lorblanchet M, Mauduit E, D'Hulst D. Conservation of prehistoric caves and stability of their inner climate: lessons from Chauvet and other French caves. Sci Total Environ 2014; 493:79-91. [PMID: 24937493 DOI: 10.1016/j.scitotenv.2014.05.137] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2014] [Revised: 05/27/2014] [Accepted: 05/28/2014] [Indexed: 06/03/2023]
Abstract
In the last 150 years, some prehistoric painted caves suffered irreversible degradations due to misperception of conservation issues and subsequent mismanagement. These sites presented naturally an exceptional stability of their internal climate allowing conservation in situ of outstanding fragile remains, some for nearly 40,000 years. This is for a large part due to exchanges of air, CO2, heat and water with the karstic system in which these caves are included. We introduce the concept of underground confinement, based on the stability of the inner cave climate parameters, especially its temperature. Confined caves present the best conservative properties. It is emphasized that this confined state implies slow exchanges with the surrounding karst and that a stable cave cannot be viewed as a closed system. This is illustrated on four case studies of French caves of various confinement states evidenced by long term continuous monitoring and on strategies to improve their conservation properties. The Chauvet cave presents optimal conservation properties. It is wholly confined as shown by the stability of its internal parameters since its discovery in 1994. In Marsoulas cave, archeological works removed the entrance scree and let a strong opening situation of the decorated zone. Remediation is expected by adding a buffer structure at the entrance. In Pech Merle tourist cave, recurrent painting fading was related to natural seasonal drying of walls. Improvement of the cave closure system restored a confined state insuring optimal visibility of the paintings. In Gargas tourist cave, optimization of closures, lighting system and number of visitors, allowed it to gradually reach a semi-confined state that improved the conservation properties. Conclusions are drawn on the characterization of confinement state of caves and on the ways to improve their conservation properties by restoring their initial regulation mechanisms and to avoid threats to their stability.
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Affiliation(s)
- F Bourges
- GEconseil, 30 rue de la République, 09200 St Girons, France.
| | - P Genthon
- IRD/HSM, Univ. Montpellier II, Case MSE, 34095 Montpellier, France.
| | - D Genty
- LSCE, UMR CEA/CNRS 8212, L'Orme des Merisiers CEA Saclay, 91191 Gif/Yvette cedex, France.
| | - M Lorblanchet
- Directeur de recherche honoraire au CNRS, Roc des Monges, 46200 Saint-Sozy, France.
| | - E Mauduit
- Service Régional de l'Archéologie, Direction Régionale des Affaires Culturelles de Midi-Pyrénées 32, rue de la Dalbade, 31080 Toulouse, France
| | - D D'Hulst
- GEconseil, 30 rue de la République, 09200 St Girons, France.
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Portmann A, Miri A, Genevois C, Chevalier L, Genty D, François A, Muraine M, Genevois O. [Secondary opacification of hydrophilic acrylic intraocular lenses: report of two cases]. J Fr Ophtalmol 2013; 36:561-6. [PMID: 23688613 DOI: 10.1016/j.jfo.2012.09.014] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2012] [Revised: 09/24/2012] [Accepted: 09/26/2012] [Indexed: 10/26/2022]
Abstract
PURPOSE To describe two cases of secondary opacification of hydrophilic acrylic IOLs after vitreoretinal surgery. METHODS Analysis of IOL deposits with anterior segment optical coherence tomography (OCT Visante(®)) and high-frequency ultrasound biomicroscopy (CineScan HF, Quantel Medical(®)) was carried out preoperatively. The explanted IOLs were analyzed with optical and electron microscopy, and energy dispersive spectrometry (EDS). RESULTS In both patients, the deposits were located on the surface and within the implant and were composed of calcium phosphate crystals. Vitreoretinal surgery performed a few months prior to the secondary opacification was identified as a risk factor. CONCLUSION When a patient presents with a secondary opacification of the IOL involving the visual axis, explantation is sometimes necessary, fortunately with typically good functional recovery in the postoperative period. While this complication is rare and the exact pathophysiology poorly understood, it must be considered in a pseudophakic patient with an unexplained decrease in visual acuity who has undergone more than one intraocular procedure.
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Affiliation(s)
- A Portmann
- Service d'ophtalmologie, hôpital Charles-Nicolle, 1, rue Germont, 76031 Rouen cedex, France
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Guérout N, Paviot A, Bon-Mardion N, Duclos C, Genty D, Jean L, Boyer O, Marie JP. Co-transplantation of olfactory ensheathing cells from mucosa and bulb origin enhances functional recovery after peripheral nerve lesion. PLoS One 2011; 6:e22816. [PMID: 21826209 PMCID: PMC3149611 DOI: 10.1371/journal.pone.0022816] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2011] [Accepted: 06/29/2011] [Indexed: 01/28/2023] Open
Abstract
Olfactory ensheathing cells (OECs) represent an interesting candidate for cell therapy and could be obtained from olfactory mucosa (OM-OECs) or olfactory bulbs (OB-OECs). Recent reports suggest that, depending on their origin, OECs display different functional properties. We show here the complementary and additive effects of co-transplanting OM-OECs and OB-OECs after lesion of a peripheral nerve. For this, a selective motor denervation of the laryngeal muscles was performed by a section/anastomosis of the recurrent laryngeal nerve (RLN). Two months after surgery, recovery of the laryngeal movements and synkinesis phenonema were analyzed by videolaryngoscopy. To complete these assessments, measure of latency and potential duration were determined by electrophysiological recordings and myelinated nerve fiber profiles were defined based on toluidine blue staining. To explain some of the mechanisms involved, tracking of GFP positive OECs was performed. It appears that transplantation of OM-OECs or OB-OECs displayed opposite abilities to improve functional recovery. Indeed, OM-OECs increased recuperation of laryngeal muscles activities without appropriate functional recovery. In contrast, OB-OECs induced some functional recovery by enhancing axonal regrowth. Importantly, co-transplantation of OM-OECs and OB-OECs supported a major functional recovery, with reduction of synkinesis phenomena. This study is the first which clearly demonstrates the complementary and additive properties of OECs obtained from olfactory mucosa and olfactory bulb to improve functional recovery after transplantation in a nerve lesion model.
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Affiliation(s)
- Nicolas Guérout
- Experimental Surgery Laboratory, Groupe de Recherche sur le Handicap Ventilatoire (GRHV), UPRES EA 3830, Institut de Recherche et d'Innovation Biomédicale de Haute Normandie (IRIB), Faculty of Medicine and Pharmacy, University of Rouen, Rouen, France.
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11
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Chévrier M, Brakch N, Céline L, Genty D, Ramdani Y, Moll S, Djavaheri-Mergny M, Brasse-Lagnel C, Annie Laquerrière AL, Barbey F, Bekri S. Autophagosome maturation is impaired in Fabry disease. Autophagy 2010; 6:589-99. [PMID: 20431343 DOI: 10.4161/auto.6.5.11943] [Citation(s) in RCA: 79] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Fabry disease is a lysosomal storage disorder (LSD) caused by a deficiency in α-galactosidase A. The disease is characterized by severe major organ involvement, but the pathologic mechanisms responsible have not been elucidated. Disruptions of autophagic processes have been reported for other LSDs, but have not yet been investigated in Fabry disease. Renal biopsies were obtained from 5 adult male Fabry disease patients before and after 3 years of enzyme replacement therapy (ERT) with agalsidase alfa. Vacuole accumulation was seen in renal biopsies from all patients compared with control biopsies. Decreases in the number of vacuoles were seen after 3 years of ERT primarily in renal endothelial cells and mesangial cells. Measurement of the levels of LC3, a specific autophagy marker, in cultured cells from Fabry patients revealed increased basal levels compared to cells from non-Fabry subjects and a larger increase in response to starvation than seen in non-Fabry cells. Starvation in the presence of protease inhibitors did not result in a significant increase in LC3 in Fabry cells, whereas a further increase in LC3 was observed in non-Fabry cells, an observation that is consistent with impaired autophagic flux in Fabry disease. Overexpression of LC3 mRNA in Fabry fibroblasts compared to control cells is consistent with an upregulation of autophagy. Furthermore, LC3 and p62/SQSTM1 (that binds to LC3) staining in renal tissues and in cultured fibroblasts from Fabry patients supports impairment of autophagic flux. These findings suggest that Fabry disease is linked to a deregulation of autophagy.
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Affiliation(s)
- Marc Chévrier
- Laboratoire de Biochimie Médicale, Rouen University Hospital and EA 4309, University of Rouen, Rouen, France
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Genty D, Blamart D, Ouahdi R, Gilmour M, Baker A, Jouzel J, Van-Exter S. Precise dating of Dansgaard-Oeschger climate oscillations in western Europe from stalagmite data. Nature 2003; 421:833-7. [PMID: 12594510 DOI: 10.1038/nature01391] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2002] [Accepted: 12/23/2002] [Indexed: 11/09/2022]
Abstract
The signature of Dansgaard-Oeschger events--millennial-scale abrupt climate oscillations during the last glacial period--is well established in ice cores and marine records. But the effects of such events in continental settings are not as clear, and their absolute chronology is uncertain beyond the limit of (14)C dating and annual layer counting for marine records and ice cores, respectively. Here we present carbon and oxygen isotope records from a stalagmite collected in southwest France which have been precisely dated using 234U/230Th ratios. We find rapid climate oscillations coincident with the established Dansgaard-Oeschger events between 83,000 and 32,000 years ago in both isotope records. The oxygen isotope signature is similar to a record from Soreq cave, Israel, and deep-sea records, indicating the large spatial scale of the climate oscillations. The signal in the carbon isotopes gives evidence of drastic and rapid vegetation changes in western Europe, an important site in human cultural evolution. We also find evidence for a long phase of extremely cold climate in southwest France between 61.2 +/- 0.6 and 67.4 +/- 0.9 kyr ago.
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Affiliation(s)
- D Genty
- IPSL/Laboratoire des Sciences du Climat et de l'Environnement, UMR CEA/CNRS 1572 Bat. 709, L'Orme des Merisiers CEA Saclay, 91191 Gif sur Yvette cedex, France.
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Etienne I, François A, Redonnet M, Mouton-Schleifer D, Guerrier V, Janvresse C, Mendel I, Genty D, Métayer J, Bessou JP, Godin M. Does polyomavirus infection induce renal failure in cardiac transplant recipients? Transplant Proc 2000; 32:2794-5. [PMID: 11134809 DOI: 10.1016/s0041-1345(00)01889-3] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- I Etienne
- Service de Néphrologie, Rouen University, Rouen, France
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