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Janot K, Boulouis G, Forestier G, Bala F, Cortese J, Szatmáry Z, Bardet SM, Baudouin M, Perrin ML, Mounier J, Couquet C, Yardin C, Segonds G, Dubois N, Martinez A, Lesage PL, Ding YH, Kadirvel R, Dai D, Mounayer C, Terro F, Rouchaud A. WEB shape modifications: angiography-histopathology correlations in rabbits. J Neurointerv Surg 2024; 16:302-307. [PMID: 37192788 DOI: 10.1136/jnis-2023-020193] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2023] [Accepted: 04/17/2023] [Indexed: 05/18/2023]
Abstract
BACKGROUND WEB Shape Modification (WSM) over time is frequent after aneurysm treatment. In this study, we explored the relationship between histopathological changes and angiographic evolution over time in experimental aneurysms in rabbits treated with the Woven EndoBridge (WEB) procedure. METHODS Quantitative WSM was assessed using flat-panel computed tomography (FPCT) during follow-up by calculating height and width ratio (HR, WR), defined as the ratio between either measurement at an index time point and the measurement immediately after WEB implantation. The index time point varied from 1 day to 6 months. HR and WR were evaluated with angiographic and histopathological assessments of aneurysm healing. RESULTS Final HR of devices varied from 0.30 to 1.02 and final WR varied from 0.62 to 1.59. Altogether, at least 5% of HR and WR variations were observed in 37/40 (92.5%) and 28/40 (70%) WEB devices, respectively, at the time of final assessment. There was no significant correlation between complete or incomplete occlusion groups and HR or WR (p=0.15 and p=0.43). Histopathological analysis revealed a significant association between WR and aneurysm healing and fibrosis 1 month following aneurysm treatment (both p<0.05). CONCLUSION Using longitudinal FPCT assessment, we observed that WSM affects both the height and width of the WEB device. No significant association was found between WSM and aneurysm occlusion status. Although presumably a multifactorial phenomenon, the histopathological analysis highlighted a significant association between width variations, aneurysm healing and fibrosis in the first month following aneurysm treatment.
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Affiliation(s)
- Kevin Janot
- Interventional Neuroradiology, University Hospital of Tours, Tours, France
| | - Grégoire Boulouis
- Interventional Neuroradiology, University Hospital of Tours, Tours, France
| | - Géraud Forestier
- Interventional Neuroradiology, University Hospital of Limoges, Limoges, France
| | - Fouzi Bala
- Interventional Neuroradiology, University Hospital of Tours, Tours, France
| | - Jonathan Cortese
- NEURI The Brain Vascular Center, Bicêtre University Hospital, Le Kremlin-Bicêtre, France
- XLIM UMR CNRS 7252, University of Limoges, Limoges, France
| | | | | | | | | | - Jérémy Mounier
- XLIM UMR CNRS 7252, University of Limoges, Limoges, France
| | - Claude Couquet
- XLIM UMR CNRS 7252, University of Limoges, Limoges, France
| | - Catherine Yardin
- Histology, Cytology, Cellular Biology and Cytogenetics, University Hospital of Limoges, Limoges, France
| | | | | | | | | | | | | | - Daying Dai
- Radiology, Mayo Clinic, Rochester, Minnesota, USA
| | - Charbel Mounayer
- Interventional Neuroradiology, University Hospital of Limoges, Limoges, France
| | - Faraj Terro
- Cell Biology, University Hospital of Limoges, Limoges, France
| | - Aymeric Rouchaud
- Interventional Neuroradiology, University Hospital of Limoges, Limoges, France
- XLIM UMR CNRS 7252, University of Limoges, Limoges, France
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Forestier G, Cortese J, Bardet SM, Baudouin M, Janot K, Ratsimbazafy V, Perrin ML, Mounier J, Couquet C, Yardin C, Larragneguy Y, Souhaut F, Chauvet R, Belgacem A, Brischoux S, Magne J, Mounayer C, Terro F, Rouchaud A. Comparison of arterial wall integration of different flow diverters in rabbits: The CICAFLOW study. J Neuroradiol 2023:S0150-9861(23)00235-3. [PMID: 37634579 DOI: 10.1016/j.neurad.2023.08.005] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2023] [Revised: 08/24/2023] [Accepted: 08/24/2023] [Indexed: 08/29/2023]
Abstract
BACKGROUND AND PURPOSE New coated flow diverters (FDs) claim antithrombotic properties and increased arterial wall integration. The aim of this study is to compare in vivo endothelial coverage of coated and uncoated FD in the context of different antiplatelet regimens. METHODS Different FDs (Silk Vista - SV, Pipeline with Shield technology - PED shield and Surpass Evolve - SE) were implanted in the aorta of rabbits, all 3 in each animal with 3 different antiplatelet regimens: no antiplatelet therapy, aspirin alone, or aspirin and ticagrelor. Four weeks after FD implantation, angiography, flat-panel CT, and optical coherence tomography (OCT) were performed before harvesting the aorta. Extensive histopathology analyses were performed including environmental scanning electron microscopy (ESEM), multiphoton microscopy (MPM) and histological staining with qualitative and/or quantitative assessment of device coverage. RESULTS All 23 FDs that were implanted remained patent without hyperplasia. Qualitative stent coverage assessment revealed that there were no statistically significant differences between the FD groups (p = 0.19, p = 0.45, p = 0.40, and p = 0.84 for OCT, ESEM, MPM and histology, respectively). Quantitative neointimal measurement of histological sections also showed similar results in all 3 FD groups (p = 0.70). However, there were significant differences between the 3 groups of antiplatelet regimens (p = 0.07) with a higher rate in the no antiplatelet group (p = 0.05 versus aspirin alone and p = 0.03 versus aspirin and ticagrelor). CONCLUSION Our study provides evidence that FD integration into the arterial wall is similar with coated (PED shield) and uncoated devices (SV, SE), regardless of the antiplatelet regimen. FD integration with specific surface coverage should be promoted. TRIAL REGISTRATION APAFIS #2022011215518538.
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Affiliation(s)
- Géraud Forestier
- University Hospital of Limoges, Neuroradiology Department, 2 avenue Martin Luther-King, Dupuytren, Limoges 87042, France; University of Limoges, XLIM UMR CNRS, Limoges 7252, France.
| | - Jonathan Cortese
- University of Limoges, XLIM UMR CNRS, Limoges 7252, France; NEURI Brain Vascular Center, Interventional Neuroradiology, Bicêtre University-Hospital, Le Kremlin-Bicêtre, France
| | | | - Maxime Baudouin
- University Hospital of Limoges, Neuroradiology Department, 2 avenue Martin Luther-King, Dupuytren, Limoges 87042, France
| | - Kévin Janot
- University of Limoges, XLIM UMR CNRS, Limoges 7252, France; Regional University Hospital Center Tours, Radiology, Diagnostic and Interventional Neuroradiology, France
| | - Voahirana Ratsimbazafy
- Service de Pharmacie, CHU de Limoges, Limoges, France; Université de Limoges, IFR 145 GEIST, Institut d'Epidémiologie Neurologique et de Neurologie Tropicale, INSERM, UMR, Limoges 1094, France
| | | | - Jérémy Mounier
- University of Limoges, XLIM UMR CNRS, Limoges 7252, France
| | - Claude Couquet
- University of Limoges, XLIM UMR CNRS, Limoges 7252, France
| | - Catherine Yardin
- University of Limoges, XLIM UMR CNRS, Limoges 7252, France; Cytology Department, Dupuytren Limoges University Hospital, France
| | | | - Flavie Souhaut
- University of Limoges, XLIM UMR CNRS, Limoges 7252, France
| | - Romain Chauvet
- University of Limoges, XLIM UMR CNRS, Limoges 7252, France
| | | | - Sonia Brischoux
- Service de pharmacie centrale, CHU Dupuytren, Limoges, France
| | - Julien Magne
- Department of Cardiology and CEBIMER, Limoges University Hospital, France; INSERM U1094, IRD U270, Univ. Limoges, CHU Limoges, EpiMaCT - Epidémiologie des maladies chroniques en zone tropicale, OmegaHealth, Institut d'Epidémiologie et de Neurologie Tropicale, Limoges, France
| | - Charbel Mounayer
- University Hospital of Limoges, Neuroradiology Department, 2 avenue Martin Luther-King, Dupuytren, Limoges 87042, France; University of Limoges, XLIM UMR CNRS, Limoges 7252, France
| | - Faraj Terro
- University of Limoges, XLIM UMR CNRS, Limoges 7252, France
| | - Aymeric Rouchaud
- University Hospital of Limoges, Neuroradiology Department, 2 avenue Martin Luther-King, Dupuytren, Limoges 87042, France; University of Limoges, XLIM UMR CNRS, Limoges 7252, France
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Szatmary Z, Mounier J, Janot K, Cortese J, Couquet C, Chaubet F, Kadirvel R, Bardet SM, Mounayer C, Rouchaud A. Bioactive refinement for endosaccular treatment of intracranial aneurysms. Neuroradiol J 2021; 34:534-541. [PMID: 34210195 DOI: 10.1177/19714009211024631] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Endovascular treatment is the first-line therapy for most intracranial aneurysms; however, recanalisation remains a major limitation. Developments in bioengineering and material science have led to a novel generation of coil technologies for aneurysm embolisation that address clinical challenges of aneurysm recurrence. This review presents an overview of modified surface coil technologies and summarises the state of the art regarding their efficacy and limitations based on experimental and clinical results. We also present potential perspectives to develop biologically optimised devices.
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Affiliation(s)
- Zoltan Szatmary
- Department of Radiology, Dupuytren Hospital, Limoges University, France
- XLIM UMR CNRS No. 7252, Limoges University, France
| | | | - Kevin Janot
- XLIM UMR CNRS No. 7252, Limoges University, France
- Regional University Hospital Center Tours, Radiology, Diagnostic and Interventional Neuroradiology, France
| | - Jonathan Cortese
- XLIM UMR CNRS No. 7252, Limoges University, France
- Bicêtre Hospital, Interventionnel Neuroradiology, Paris, France
| | | | - Frédéric Chaubet
- Laboratory for Vascular Translational Science, UMRS 1148, INSERM, Université de Paris, France
- Université Sorbonne Paris Nord- Campus de Bobigny, France
| | | | | | - Charbel Mounayer
- Department of Radiology, Dupuytren Hospital, Limoges University, France
- XLIM UMR CNRS No. 7252, Limoges University, France
| | - Aymeric Rouchaud
- Department of Radiology, Dupuytren Hospital, Limoges University, France
- XLIM UMR CNRS No. 7252, Limoges University, France
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Papagiannaki C, Yardin C, Iosif C, Couquet C, Clarençon F, Mounayer C. Intra-arterial in-situ bevacizumab injection effect on angiogenesis. Results on a swine angiogenesis model. J Neuroradiol 2020; 48:299-304. [PMID: 32184118 DOI: 10.1016/j.neurad.2020.03.003] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2019] [Revised: 03/01/2020] [Accepted: 03/05/2020] [Indexed: 11/18/2022]
Abstract
BACKGROUND AND PURPOSE In this study we tested the effect of antiangiogenics on a swine angiogenesis model that shares some brain AVM histological characteristics. The objective was to determine bevacizumab effects on retia volumes and on vessels' wall. MATERIALS AND METHODS Fifteen pigs were divided into 3 groups: Five animals served as controls (group A), 5 animals underwent endovascular left external and common carotid artery occlusion (group B) and 5 animals underwent the same procedure and had an intra-arterial in-situ injection of bevacizumab (groupC) 2 months after the occlusion. A DSA associated with 3D-rotational angiography was performed at day 0 and at 3 months in all groups in order to measure rete mirabile volumes. The animals were sacrificed at 3 months and the retia were harvested for pathological and immunohistochemistry examinations. RESULTS All VEGF-A receptors were blocked at the site of injection and there was a local enhanced endothelial proliferation and apoptosis. The volume of the retia remained unchanged after the bevacizumab injection. Retia vessels presented comparable media thickness, higher endothelial proliferation and apoptosis after the anti-VEGF injection. CONCLUSION A single in-situ injection of bevacizumab in this swine angiogenesis model showed no change in retia volume and an extensive blockage of VEGF receptors at the site of injection one month later. Rete mirabile vessels presented comparable media thickness, higher endothelial proliferation and apoptosis after the anti-VEGF injection, suggesting that bevacizumab antiangiogenic effect does not fragilize vessel wall. More studies are needed to confirm these preliminary insights of in-situ antiangiogenic effect on vascular malformations.
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Affiliation(s)
- Chrysanthi Papagiannaki
- CNRS, XLIM, UMR 7252, University of Limoges, 87000 Limoges, France; Department of Interventional Neuroradiology, CHU Rouen, Rouen, France.
| | - Catherine Yardin
- CNRS, XLIM, UMR 7252, University of Limoges, 87000 Limoges, France; Department of Cytology, Histology and Biology, CHU Limoges, Limoges, France
| | - Christina Iosif
- CNRS, XLIM, UMR 7252, University of Limoges, 87000 Limoges, France; Department of Interventional Neuroradioligy, Erasmus University Hospital, ULB University, Brussels, Belgium
| | - Claude Couquet
- CNRS, XLIM, UMR 7252, University of Limoges, 87000 Limoges, France; Haute Vienne Departmental Laboratory for research and analysis, Limoges, France
| | - Frederic Clarençon
- CNRS, XLIM, UMR 7252, University of Limoges, 87000 Limoges, France; Department of Neurorradiology, Pitié Salpetrière Hospital, Paris, France
| | - Charbel Mounayer
- CNRS, XLIM, UMR 7252, University of Limoges, 87000 Limoges, France; Department of Neuroradiology, CHU Limoges, Limoges, France
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Iosif C, Ponsonnard S, Roussie A, Saleme S, Carles P, Ponomarjova S, Pedrolo-Silveira E, Mendes G, Waihrich E, Couquet C, Yardin C, Mounayer C. Jailed Artery Ostia Modifications After Flow-Diverting Stent Deployment at Arterial Bifurcations. Neurosurgery 2016; 79:473-80. [DOI: 10.1227/neu.0000000000001311] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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6
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Papagiannaki C, Clarençon F, Ponsonnard S, Couquet C, Maizeroi-Eugène F, Bresson D, Yardin C, Mounayer C. Development of an angiogenesis animal model featuring brain arteriovenous malformation histological characteristics. J Neurointerv Surg 2016; 9:204-210. [PMID: 27013231 DOI: 10.1136/neurintsurg-2015-012173] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [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: 11/23/2015] [Revised: 02/28/2016] [Accepted: 03/01/2016] [Indexed: 11/03/2022]
Abstract
BACKGROUND Angiogenesis has a key role in the formation and evolution of brain arteriovenous malformations (AVMs). Numerous models have been developed aiming to recreate configuration of brain AVMs. OBJECTIVE To develop an animal model sharing the same pathological characteristics as human brain AVMs. MATERIALS AND METHODS Ten pigs were divided into two groups. Five animals underwent endovascular left common carotid artery (CCA) and external carotid artery (ECA) occlusion and five animals served as controls. DSA, associated with 3D-rotational angiography, was performed at day 0 and at 3 months in both groups. The volume of the retia was calculated. Vascular endothelial growth factor (VEGF)-A serum levels were measured in both groups at the same time intervals. Finally, the animals were sacrificed at 3 months and the retia were harvested for pathological and immunohistochemistry examinations. RESULTS At 3 months, a significantly higher rete volume was seen in group A than in group B (2.92±0.33 mL vs 1.87±0.69 mL, respectively; p=0.016). There was a trend for increased VEGF-A levels in group A at 3 months. In the occlusion group, histological findings showed significant reduction of media thickness and disrupted internal elastic lamina; immunohistochemistry findings showed strong reactivity for VEGF receptors and interleukin 6. CONCLUSIONS Unilateral endovascular occlusion of the CCA-ECA results in angiogenesis triggering of the rete mirabile with both significant augmentation of the rete volume and histological evidence of pro-angiogenic stimulation.
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Affiliation(s)
- Chrysanthi Papagiannaki
- ERMA (Equipe de Recherche Medicale Appliquée), Limoges University Hospital, Limoges, France.,Interventional Neuroradiology Department, Rouen University Hospital, Rouen, France
| | - Frédéric Clarençon
- ERMA (Equipe de Recherche Medicale Appliquée), Limoges University Hospital, Limoges, France.,Interventional Neuroradiology Department, Pitié-Salpêtrière Hospital, Paris, France
| | - Sébastien Ponsonnard
- ERMA (Equipe de Recherche Medicale Appliquée), Limoges University Hospital, Limoges, France.,Anesthesiology Department, Limoges University Hospital, Limoges, France
| | - Claude Couquet
- Haute Vienne Departmental Laboratory for Research and Analysis, Limoges, France
| | | | - Damien Bresson
- Department of Neurosurgery, Lariboisière University Hospital, Paris, France
| | - Catherine Yardin
- ERMA (Equipe de Recherche Medicale Appliquée), Limoges University Hospital, Limoges, France.,Department of Histology, Cytology, Cellular Biology and Cytogenetics, Limoges University Hospital, Limoges, France
| | - Charbel Mounayer
- ERMA (Equipe de Recherche Medicale Appliquée), Limoges University Hospital, Limoges, France.,Department of Interventional Neuroradiology, Limoges University Hospital, Limoges, France
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Clarençon F, Maizeroi-Eugène F, Bresson D, Maingreaud F, Sourour N, Couquet C, Ayoub D, Chiras J, Yardin C, Mounayer C. Elaboration of a semi-automated algorithm for brain arteriovenous malformation segmentation: initial results. Eur Radiol 2014; 25:436-43. [DOI: 10.1007/s00330-014-3421-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2014] [Accepted: 08/28/2014] [Indexed: 11/28/2022]
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8
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Gauthier T, Marquet P, Kanoun D, Maubon A, Piver P, Couquet C, Aubard Y. Pelvic magnetic resonance imaging in the ewe: A model for experimental gynecologic research. J Obstet Gynaecol Res 2013; 40:133-8. [DOI: 10.1111/jog.12141] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2012] [Accepted: 04/04/2013] [Indexed: 11/29/2022]
Affiliation(s)
- Tristan Gauthier
- Gynecology and Obstetrics Department; Mother and Child Hospital; University Hospital of Limoges; Limoges France
| | - Pierre Marquet
- Pharmacology and Toxicology Department; INSERM; UMR-S850; University Hospital of Limoges; Limoges France
| | - Dorra Kanoun
- Gynecology and Obstetrics Department; Mother and Child Hospital; University Hospital of Limoges; Limoges France
| | - Antoine Maubon
- Medical Imagery; University Hospital of Limoges; Limoges France
| | - Pascal Piver
- Gynecology and Obstetrics Department; Mother and Child Hospital; University Hospital of Limoges; Limoges France
| | - Claude Couquet
- Analysis and Research Laboratory of Haute-Vienne; Limoges France
| | - Yves Aubard
- Gynecology and Obstetrics Department; Mother and Child Hospital; University Hospital of Limoges; Limoges France
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9
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Gory B, Bresson D, Kessler I, Perrin ML, Guillaudeau A, Durand K, Ponsonnard S, Couquet C, Yardin C, Mounayer C. Histopathologic evaluation of arterial wall response to 5 neurovascular mechanical thrombectomy devices in a swine model. AJNR Am J Neuroradiol 2013; 34:2192-8. [PMID: 23538407 DOI: 10.3174/ajnr.a3531] [Citation(s) in RCA: 81] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE Five commercial devices are available for mechanical thrombectomy in acute ischemic stroke. This study evaluated and compared the resultant arterial damage from these devices. MATERIALS AND METHODS Wall damage after 4 wall-contact devices (the Merci retriever, Catch thromboembolectomy system, and Solitaire FR revascularization devices of 4 and 6 mm) and 1 aspiration device (the Penumbra System) was evaluated in the superficial femoral arteries of 20 male swine. Each device was tested with and without intraluminal clot. Twenty control vessels were not subjected to any intervention. Acute histopathologic changes were evaluated. RESULTS In the device samples, endothelial denudation (72.8 ± 29.4% versus 0.9 ± 1.9%, P < .0001), medial layer edema (52 ± 35.9% versus 18.1 ± 27.8%, P = .004), and mural thrombus (5.3 ± 14.2% versus 0%, P = .05) were found to a greater extent compared with the control samples. The aspiration device provoked more intimal layer (100 ± 79.1% versus 58.8 ± 48.9%, P = .27) and medial layer (75 ± 35.4% versus 46.3 ± 34.8%, P = .13) edema than the wall-contact devices. CONCLUSIONS All devices caused vascular injuries extending into the medial layer. The aspiration device was associated with more intimal and medial layer edema, compared with the wall-contact devices except for the Catch thromboembolectomy system.
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Affiliation(s)
- B Gory
- Departments of Interventional Neuroradiology
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Gauthier T, Bertin F, Fourcade L, Maubon A, Saint Marcoux F, Piver P, Marquet P, Pommepuy I, Plainard X, Couquet C, Cornuejols MJ, Essig M, Aubard Y. Uterine allotransplantation in ewes using an aortocava patch. Hum Reprod 2011; 26:3028-36. [DOI: 10.1093/humrep/der288] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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11
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Adjou KT, Allix S, Ouidja MO, Backer S, Couquet C, Cornuejols MJ, Deslys JP, Brugère H, Brugère-Picoux J, El-Hachimi KH. Alpha-synuclein Accumulates in the Brain of Scrapie-affected Sheep and Goats. J Comp Pathol 2007; 137:78-81. [PMID: 17544436 DOI: 10.1016/j.jcpa.2007.03.007] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [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: 06/12/2006] [Accepted: 03/26/2007] [Indexed: 10/23/2022]
Abstract
Immunohistochemical examination demonstrated widespread granular deposits of alpha-synuclein (alphaSN) in the brains of sheep and goats with natural scrapie, especially in the cornu ammonis and subiculum of the hippocampus; this contrasted with the diffuse and non-granular immunolabelling seen in healthy controls. There was non-regular "co-localization" of PrP(Sc) and alphaSN. The findings resembled those reported in Creutzfeldt-Jakob disease and in experimental prion disease in hamsters and mice. The results suggest that perturbation of alphaSN metabolism plays a role in human and animal prion diseases.
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Affiliation(s)
- K T Adjou
- Ecole Nationale Vétérinaire d'Alfort (Laboratoire de Pathologie Médicale du Bétail and Service de Physiologie et Thérapeutique), 7 Avenue du Général de Gaulle, 94 704 Maisons-Alfort, Cedex.
| | - S Allix
- Ecole Nationale Vétérinaire d'Alfort (Laboratoire de Pathologie Médicale du Bétail and Service de Physiologie et Thérapeutique), 7 Avenue du Général de Gaulle, 94 704 Maisons-Alfort, Cedex
| | - M O Ouidja
- Ecole Nationale Vétérinaire d'Alfort (Laboratoire de Pathologie Médicale du Bétail and Service de Physiologie et Thérapeutique), 7 Avenue du Général de Gaulle, 94 704 Maisons-Alfort, Cedex
| | - S Backer
- Ecole Nationale Vétérinaire d'Alfort (Laboratoire de Pathologie Médicale du Bétail and Service de Physiologie et Thérapeutique), 7 Avenue du Général de Gaulle, 94 704 Maisons-Alfort, Cedex
| | - C Couquet
- Laboratoire Départemental Vétérinaire, Avenue du Professeur J de Léobardy, 87 000 Limoges
| | - M-J Cornuejols
- Laboratoire Départemental Vétérinaire, Avenue du Professeur J de Léobardy, 87 000 Limoges
| | - J-P Deslys
- GID/TIP, CEA, DSV/DRM, 18 rue du Panorama, 92 265 Fontenay-aux-Roses, Cedex
| | - H Brugère
- Ecole Nationale Vétérinaire d'Alfort (Laboratoire de Pathologie Médicale du Bétail and Service de Physiologie et Thérapeutique), 7 Avenue du Général de Gaulle, 94 704 Maisons-Alfort, Cedex
| | - J Brugère-Picoux
- Ecole Nationale Vétérinaire d'Alfort (Laboratoire de Pathologie Médicale du Bétail and Service de Physiologie et Thérapeutique), 7 Avenue du Général de Gaulle, 94 704 Maisons-Alfort, Cedex
| | - K H El-Hachimi
- EPHE and INSERM U616, Hôpital la Salpêtrière, 47 Boulevard de l'Hôpital, 75 013 Paris, France
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Boda C, Enanga B, Dumet H, Chauviere G, Labrousse F, Couquet C, Saivin S, Houin G, Perie J, Dumas M, Bouteille B. Plasma kinetics and efficacy of oral megazol treatment in Trypanosoma brucei brucei-infected sheep. Vet Parasitol 2004; 121:213-23. [PMID: 15135860 DOI: 10.1016/j.vetpar.2004.02.027] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [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: 08/21/2003] [Revised: 01/30/2004] [Accepted: 02/09/2004] [Indexed: 11/18/2022]
Abstract
Experimentally infected sheep have been previously developed as an animal model of trypanosomosis. We used this model to test the efficacy of megazol on eleven Trypanosoma brucei brucei-infected sheep. When parasites were found in blood on day 11 post-infection, megazol was orally administered at a single dose of 40 or 80mg/kg. After a transient aparasitaemic period, all animals except two relapsed starting at day 2 post-treatment, which were considerated as cured on day 150 post-treatment and showed no relapse after a follow-up period of 270 days. In order to understand the high failure of megazol treatment to cure animals, a kinetic study was carried out. Plasma concentrations of megazol determined, by reverse-phase high-performance liquid chromatography at 8h post-treatment in these animals, were lowered, suggesting slow megazol absorption, except in cured animals. However, megazol plasma profiles in uninfected sheep after a single oral dose of megazol showed a fast megazol lowered absorption associated with a short plasma half-life of drug. Inter-individual variation of megazol pharmacokinetic properties was also observed. These findings suggested that the high failure rates of megazol treatment were related to poor drug availability after oral administration in sheep. In conclusion, megazol could cure sheep with T. b. brucei infection but oral administration was not an effective route.
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Affiliation(s)
- Caroline Boda
- Institut d'Epidémiologie Neurologique et de Neurologie Tropicale (EA3174), Faculté de Médecine, 2 rue du Docteur Marcland, 87025 Limoges Cedex, France.
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Chartier C, Soubirac F, Pors I, Silvestre A, Hubert J, Couquet C, Cabaret J. Prevalence of anthelmintic resistance in gastrointestinal nematodes of dairy goats under extensive management conditions in southwestern France. J Helminthol 2001; 75:325-30. [PMID: 11818048 DOI: 10.1017/s0022149x01000506] [Citation(s) in RCA: 47] [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] [Indexed: 11/05/2022]
Abstract
The occurrence of benzimidazole (BZ) and levamisole resistance was investigated in 18 randomly selected dairy goat herds located in southwestern France and characterized by extensive management. On each of the 18 farms, 45 adult goats were randomly allocated into three groups of 15 animals each: an untreated control group, a group that was orally administered fenbendazole (10 mg kg(-1) body weight) and a group that received orally a levamisole drench (12 mg kg(-1) body weight). Individual faecal egg counts and pooled larval cultures were done 10 days after anthelmintic treatment. Naive lambs were infected with larvae obtained from control and fenbendazole treated groups and were necropsied 35 days after infection for worm recovery. Faecal egg count reductions (FERC) were calculated for fenbendazole and levamisole and, when less than 95 per 100, were considered as indicative of anthelmintic resistance. An in vitro egg hatch test (EHT) was conducted with thiabendazole on eggs isolated from pooled faeces of fenbendazole treated goats in nine farms. Faecal egg count reductions indicated the occurrence of benzimidazole resistance in 15 out of 18 farms. Among these farms, nine had EHT values above 0.1 microg thiabendazole ml(-1) confirming the benzimidazole resistance status. Levamisole resistance was detected in two farms through FECR. Based on necropsy results, the prevalence of benzimidazole resistance was higher in Trichostrongylus colubriformis, medium in Haemonchus contortus and lower in Teladorsagia circumcincta. In nine farms the benzimidazole resistance was monospecific whereas multispecific resistance was found in the six remaining farms. A negative relationship was found between FECR for fenbendazole and the average number of anthelmintic treatments given per year on the farm. Despite extensive management including a low number of treatments, the prevalence of benzimidazole resistance was very high suggesting that the repeated and sometimes exclusive use of benzimidazole drugs, even at low frequency, is probably the main cause in developing nematode resistance in dairy goat herds. The importance of other factors such as under-dosing or buying animals already carrying resistant nematodes are discussed.
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Affiliation(s)
- C Chartier
- AFFSA Site de Niort, Laboratoire d'études et de recherches caprines, Niort, France.
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Guédon L, Saumande J, Dupron F, Couquet C, Desbals B. Serum cholesterol and triglycerides in postpartum beef cows and their relationship to the resumption of ovulation. Theriogenology 1999; 51:1405-15. [PMID: 10729103 DOI: 10.1016/s0093-691x(99)00083-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
The variations in lipid metabolism according to the physiological stage and their relationship to the resumption of postpartum ovarian cyclicity were assessed in Limousine beef cows fed a grass diet over 3 yr. Weekly blood samples were collected from 59 cows beginning 10 wk before to 20 wk after calving to evaluate serum cholesterol and triglyceride concentrations and electrophoretic lipoprotein fractions. After parturition, progesterone concentrations were also measured at weekly intervals to determine time of resumption of ovulation. Cows were categorized by resumption of postpartum ovarian cyclicity into 3 groups: early (4 to 6 wk post partum, n = 36); mid (7 to 10 wk post partum, n = 46) and late (after 11 wk post partum, n = 38). Higher serum triglyceride values (P<0.05) were observed during the last 10 wk of pregnancy (0.36+/-0.15 g/L) than during the first 20 wk of suckling (0.29+/-0.09 g/L). Cholesterol values decreased significantly (P<0.05) at the end of pregnancy, were minimal (1.01+/-0.03 g/L) at parturition, and increased again up to 9 wk post calving. Increased cholesterolemia and low serum triglyceride values after calving could be linked to the increased bovine alpha-lipoprotein fraction and decreased beta fraction. Serum triglyceride concentrations were not related to the resumption of postpartum ovarian cyclicity. Higher serum cholesterol values were observed from 2 wk before to 4 wk after calving in cows with early rather than mid and late resumption of ovarian cyclicity. Therefore, modifications in lipid metabolism during the puerperium seem to be related to resumption of cyclicity during the early postpartum period.
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Affiliation(s)
- L Guédon
- Laboratoire d'Endocrinologie Générale Université de Limoges, France
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