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Ahrweiller K, Houvenaghel JF, Riou A, Drapier S, Sauleau P, Haegelen C, Jannin P, Vérin M, Palard X, Le Jeune F. Postural instability and gait disorders after subthalamic nucleus deep brain stimulation in Parkinson's disease: a PET study. J Neurol 2019; 266:2764-2771. [PMID: 31350641 DOI: 10.1007/s00415-019-09482-y] [Citation(s) in RCA: 6] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2019] [Revised: 07/09/2019] [Accepted: 07/22/2019] [Indexed: 01/13/2023]
Abstract
INTRODUCTION Patients with Parkinson's disease sometimes report postural instability and gait disorders (PIGD) after subthalamic nucleus deep brain stimulation (STN-DBS). Whether this is the direct consequence of DBS or the result of natural disease progression is still subject to debate. OBJECTIVE To compare changes in brain metabolism during STN-DBS between patients with and without PIGD after surgery. METHODS We extracted consecutive patients from a database where all Rennes Hospital patients undergoing STN-DBS are registered, with regular prospective updates of their clinical data. Patients were divided into two groups (PIGD and No PIGD) according to changes after surgery, as measured with a composite score based on the selected Unified Parkinson's Disease Rating Scale items. All patients underwent positron emission tomography with 18[F]-fluorodeoxyglucose 3 months before and after surgery. We ran an ANOVA with two factors (group: PIGD vs. No PIGD; and phase: preoperative vs. postoperative) on SPM8 to compare changes in brain metabolism between the two groups. RESULTS Participants were 56 patients, including 10 in the PIGD group. The two groups had similar baseline (i.e., before surgery) characteristics. We found two clusters of increased metabolism in the PIGD group relative to the No PIGD group: dorsal midbrain/pons, including locomotor mesencephalic region and reticular pontine formation, and right motor cerebellum. CONCLUSION We found different metabolic changes during DBS-STN among patients with PIGD, concerning brain regions that are already known to be involved in gait disorders in Parkinson's disease, suggesting that DBS is responsible for the appearance of PIGD.
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Affiliation(s)
- Kévin Ahrweiller
- "Behavior and Basal Ganglia" Research Unit, University of Rennes 1, Rennes, France. .,Department of Neurology, University Hospital of Rennes, Rennes, France.
| | - J F Houvenaghel
- "Behavior and Basal Ganglia" Research Unit, University of Rennes 1, Rennes, France.,Department of Neurology, University Hospital of Rennes, Rennes, France
| | - A Riou
- "Behavior and Basal Ganglia" Research Unit, University of Rennes 1, Rennes, France.,Department of Neurology, University Hospital of Rennes, Rennes, France
| | - S Drapier
- "Behavior and Basal Ganglia" Research Unit, University of Rennes 1, Rennes, France.,Department of Neurology, University Hospital of Rennes, Rennes, France
| | - P Sauleau
- "Behavior and Basal Ganglia" Research Unit, University of Rennes 1, Rennes, France.,Department of Neurophysiology, University Hospital of Rennes, Rennes, France
| | - C Haegelen
- Department of Neurosurgery, University Hospital of Rennes, Rennes, France.,MediCIS" Laboratory, INSERM/University of Rennes 1, Rennes, France
| | - P Jannin
- MediCIS" Laboratory, INSERM/University of Rennes 1, Rennes, France
| | - M Vérin
- "Behavior and Basal Ganglia" Research Unit, University of Rennes 1, Rennes, France.,Department of Neurology, University Hospital of Rennes, Rennes, France
| | - X Palard
- "Behavior and Basal Ganglia" Research Unit, University of Rennes 1, Rennes, France.,Department of Nuclear Medicine, Eugene Marquis Hospital Centre, University Hospital of Rennes, Rennes, France
| | - F Le Jeune
- "Behavior and Basal Ganglia" Research Unit, University of Rennes 1, Rennes, France.,Department of Nuclear Medicine, Eugene Marquis Hospital Centre, University Hospital of Rennes, Rennes, France
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Hue S, Audureau E, Riou A, Colin A, Lalevée S, Anquetin M, Barau C, Valeyrie-Allanore L, Delfau-Larue MH, Chosidow O, Oro S, Wolkenstein P. Profil cytokinique des toxidermies graves : étude monocentrique sur 133 patients. Ann Dermatol Venereol 2017. [DOI: 10.1016/j.annder.2017.09.019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Pepin JF, Riou A, Renault T. Rapid and sensitive detection of ostreid herpesvirus 1 in oyster samples by real-time PCR. J Virol Methods 2008; 149:269-76. [PMID: 18342377 DOI: 10.1016/j.jviromet.2008.01.022] [Citation(s) in RCA: 131] [Impact Index Per Article: 8.2] [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: 06/21/2007] [Revised: 11/29/2007] [Accepted: 01/22/2008] [Indexed: 11/18/2022]
Abstract
Herpes and herpes-like virus infections have been reported in various marine mollusc species associated with high mortality rates. Following the characterisation and genome sequencing of ostreid herpesvirus 1 (OsHV-1), specific diagnostic tools have been developed based on conventional PCR techniques or in situ hybridisation. We have now developed a real-time PCR assay for rapid, sensitive and quantitative detection of OsHV-1, and compared it with a conventional PCR technique described previously. The new assay utilised SYBR((R)) Green chemistry with specific primers C(9)/C(10) targeting the C region. The melt curve analysis of OsHV-1 DNA or DNA extracted from infected material showed only one melting temperature peak (75.75+/-0.1 degrees C). The assay had a detection limit of 4 copies/microL of viral genomic DNA and a dynamic range of 5 logs. Using infected oyster samples as template, the assay was about 100-fold more sensitive than single PCR method using C(2)/C(6) primers. The assay was applied successfully for rapid diagnosis (100 min) and quantitation of OsHV-1 in different developmental stages of Crassostrea gigas. Although it already exists a competitive PCR method to quantify OsHV-1 DNA, quantitative data that will emerge in future using the new sensitive and reliable assay will illuminate aspects of pathogenesis, in particular the viral loads in asymptomatic oysters and the kinetics of infection in specific target tissues.
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Affiliation(s)
- J F Pepin
- Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Laboratoire de Génétique et Pathologie (LGP), 17390 La Tremblade, France.
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Hudhomme P, Le Moustarder S, Durand C, Gallego-Planas N, Mercier N, Blanchard P, Levillain E, Allain M, Gorgues A, Riou A. S-position isomers of BEDT-TTF and EDT-TTF: synthesis and influence of outer sulfur atoms on the electrochemical properties and crystallographic network of related organic metals. Chemistry 2001; 7:5070-83. [PMID: 11775680 DOI: 10.1002/1521-3765(20011203)7:23<5070::aid-chem5070>3.0.co;2-6] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The synthesis and characterization of new modified tetrathiafulvalenes (TTF), the S-position isomers of BEDT-TTF and EDT-TTF, are described. The synthetic strategy presented in this work is based on an efficient and unprecedented two-step sequence for the conversion of a vicinal bis(hydroxymethyl) functionality into a disulfide ring. Different routes are discussed in terms of efficiency for the synthesis of the symmetric S-position isomer of BEDT-TTF and that of EDT-TTF. Their electrochemical properties are combined with data obtained from UV/Vis spectroscopy and orbital calculations, and the electronic influence of peripheral sulfur atoms on the neutral and oxidized species is discussed. The introduction of these outer sulfur atoms at the periphery of the TTF core gives rise to specific intermolecular S...S interactions in the corresponding organic materials. Crystallographic studies of radical cation salts synthesized upon electrocrystallization clearly showed that the network obtained is dictated by the outer sulfur atoms, which are responsible for a characteristic and unprecedented "windmill" array.
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Affiliation(s)
- P Hudhomme
- Ingénierie Moléculaire et Matériaux Organiques, UMR 6501 Université d'Angers, France.
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Jouad EM, Larcher G, Allain M, Riou A, Bouet GM, Khan MA, Thanh XD. Synthesis, structure and biological activity of nickel(II) complexes of 5-methyl 2-furfural thiosemicarbazone. J Inorg Biochem 2001; 86:565-71. [PMID: 11566328 DOI: 10.1016/s0162-0134(01)00220-3] [Citation(s) in RCA: 77] [Impact Index Per Article: 3.3] [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: 11/20/2022]
Abstract
5-Methyl 2-furfuraldehyde thiosemicarbazone (M5HFTSC) with nickel(II) leads to three types of complexes: [Ni(M5HFTSC)(2)X(2)], [Ni(M5FTSC)(2)] and [Ni(M5FTSC)(2)] x 2DMF. In the first type the ligand remains in thione form, while in the two other, the anionic thiolato form is involved. The species [Ni(M5HFTSC)(2)X(2)] has been characterized spectroscopically. The structures of [Ni(M5FTSC)(2)] x 2DMF and [Ni(M5FTSC)(2)] have been solved using X-ray diffraction. Biological studies of [Ni(M5HFTSC)(2)Cl(2)] have been carried out in vitro for antifungal activity on human pathogenic fungi, Aspergillus fumigatus and Candida albicans, and in vivo for toxicity on mice. The results are compared to those of the ligand, the metal salt and a similar copper complex [Cu(M5HFTSC)Cl(2)].
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Affiliation(s)
- E M Jouad
- Chimie de Coordination, Faculté de Pharmacie, Université d'Angers, 16 Boulevard Daviers, F-49045 Angers Cedex 01, France
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Le Derf F, Mazari M, Mercier N, Levillain E, Trippé G, Riou A, Richomme P, Becher J, Garín J, Orduna J, Gallego-Planas N, Gorgues A, Sallé M. Tetrathiafulvalene crowns: redox-switchable ligands. Chemistry 2001; 7:447-55. [PMID: 11271531 DOI: 10.1002/1521-3765(20010119)7:2<447::aid-chem447>3.0.co;2-a] [Citation(s) in RCA: 91] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
A series of redox-responsive ligands that associate the electroactive tetrathiafulvalene core with polyether subunits of various lengths has been synthesized. X-ray structures are provided for each of the free ligands. The requisite structural criteria for reaching switchable ligands are satisfied for the largest macrocycles, that is, planarity of the 1,1',3,3'-tetrathiafulvalene (TTF) pi system and correctly oriented coordinating atoms. The ability of these ligands to recognize various metal cations as a function of the cavity size has been investigated by various techniques (LSIMS, 1H NMR, and UV/Vis spectroscopy, cyclic voltammetry). These systems exhibit an unprecedented high coordination ability among TTF crown ethers. Their switchable ligating properties have been confirmed by cyclic voltammetry, and metal-cation complexation has been illustrated by X-ray structures of three of the corresponding metal complexes (Pb2+, Sr2+, and Ba2+). Solid-state structures of these complexes display original packing modes with channel-like arrangements.
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Affiliation(s)
- F Le Derf
- Laboratoire d'Ingénierie Moléculaire et Matériaux Organiques, UMR CNRS 6501, Université d'Angers, France
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Triki S, Bérézovsky F, Sala Pala J, Coronado E, Gómez-García CJ, Clemente JM, Riou A, Molinié P. Oxalato-bridged dinuclear complexes of Cr(III) and Fe(III): synthesis, structure, and magnetism of [(C2H5)4N]4[MM'(ox)(NCS)8] with MM' = CrCr, FeFe, and CrFe. Inorg Chem 2000; 39:3771-6. [PMID: 11196768 DOI: 10.1021/ic990439w] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A new series of homo- and heterometallic oxalato-bridged dinuclear compounds of formulas [Et4N]4[MM'(ox)(NCS)8] ([Et4N]+ = [(C2H5)4N]+; ox = C2O4(2-)) with MM' = Cr(III)-Cr(III) (1), Fe(III)-Fe(III) (2), and Cr(III)-Fe(III) (3) is reported. They have been structurally characterized by infrared spectra and single-crystal X-ray diffraction. The three compounds are isostructural and crystallize in the orthorhombic space group Cmca with Z = 8, a = 16.561(8) A, b = 13.481(7) A, and c = 28.168(8) A for 1, a = 16.515(2) A, b = 13.531(1) A, and c = 28.289(4) A for 2, a = 16.664(7) A, b = 13.575(6) A, and c = 28.386(8) A for 3. The structure of 3 is made up of a discrete dinuclear anion [CrFe(ox)(NCS)8]4- and four disordered [Et4N]+ cations, each of them located on special positions. The anion, in a crystallographically imposed C2h symmetry, contains metal cations in distorted octahedral sites. The Cr(ox)Fe group, which is planar within 0.02 A, presents an intramolecular metal-metal distance of 5.43 A. Magnetic susceptibility measurements indicate antiferromagnetic pairwise interactions for 1 and 2 with J = -3.23 and -3.84 cm-1, respectively, and ferromagnetic Cr-Fe coupling with J = 1.10 cm-1 for 3 (J being the parameter of the exchange Hamiltonian H = -2JS1S2). The ESR spectra at different temperatures confirm the magnetic susceptibility data.
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Affiliation(s)
- S Triki
- UMR CNRS 6521, Chimie, Electrochimie Moléculaires et Chimie Analytique, Université de Bretagne Occidentale, 29285 Brest, France. ;
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Terkia-Derdra N, Andreu R, Salle M, Levillain E, Orduna J, Garin J, Orti E, Viruela R, Pou-Amerigo R, Sahraoui B, Gorgues A, Favard JF, Riou A. pi conjugation across the tetrathiafulvalene core: synthesis of extended tetrathiafulvalene derivatives and theoretical analysis of their unusual electrochemical properties. Chemistry 2000; 6:1199-213. [PMID: 10785806 DOI: 10.1002/(sici)1521-3765(20000403)6:7<1199::aid-chem1199>3.3.co;2-7] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
A series of extended tetrathiafulvalene (TTF) derivatives bearing one or two 1,4-dithiafulven-6-yl substitutents has been prepared. The new compounds present remarkable electrochemical singularities compared with other TTF derivatives, which are strongly affected by the nature of the substitution on the lateral heterocycle(s). This unusual electrochemical behaviour follows a square-scheme sequence and is attributed to structural changes upon oxidation of the pi-donating molecules. Digital simulations of the electrochemical data have been used to reach the values of the kinetic and thermodynamic constants involved in the square scheme. Theoretical calculations establish an important contribution of a highly delocalised resonant form involving a tetravalent sulphur in oxidised species, which could justify the occurrence of an electrochemical behaviour distinct from that of TTF. Finally, third-order susceptibilities chi 3 of two of these systems, for which electron-donating and electron-withdrawing substituents coexist and are conjugated through the TTF pi system, are given.
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Affiliation(s)
- N Terkia-Derdra
- Laboratoire d'Ingenierie Moleculaire et Materiaux Organiques, UMR CNRS 6501, Universite d'Angers, France
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Gautier N, Mercier N, Riou A, Gorgues A, Hudhomme P. A new strategy to reach highly extended and quinonoid tetrathiafulvalene (TTF) derivatives. Tetrahedron Lett 1999. [DOI: 10.1016/s0040-4039(99)01162-4] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Nguyen TT, Sallé M, Delaunay J, Riou A, Richomme P, Raimundo JM, Gorgues A, Ledoux I, Dhenaut C, Zyss J, Orduna J, Garín J. Functionalized polyolefinic nonlinear optic chromophores incorporating the 1,3-dithiol-2-ylidene moiety as the electron-donating part. ACTA ACUST UNITED AC 1998. [DOI: 10.1039/a709055b] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Gerault Y, Riou A, Cudennec Y. Structure cristalline des bis(dichromate) de bismuth et de thallium et bis(dichromate) d'ammonium et de bismuth. Acta Crystallogr C 1989. [DOI: 10.1107/s0108270189002374] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Riou A, Gerault Y, Cudennec Y. Etude par diffraction X de la structure du chromate dichromate de bismuth et de potassium monohydraté. Acta Crystallogr B Struct Crystallogr Cryst Chem 1982. [DOI: 10.1107/s0567740882006979] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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