101
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Engelen L, Boutouyrie P, Ferreira I, Stehouwer C, Laurent S. 3.3 NORMAL AND REFERENCE VALUES FOR CAROTID INTIMA-MEDIA THICKNESS. Artery Res 2011. [DOI: 10.1016/j.artres.2011.10.215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022] Open
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102
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Nguyen V, Collin C, Varinot J, Boutouyrie P, Laurent S. 5.2 ARTERIAL STIFFNESS IS A MAJOR INDEPENDENT DETERMINANT OF VISIT-TO-VISIT VARIABILITY IN SBP: A 9.1 YEAR FOLLOW-UP IN TREATED HYPERTENSIVES. Artery Res 2011. [DOI: 10.1016/j.artres.2011.10.220] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022] Open
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103
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Laurent S. On Vershikian and I-Cosy Random Variables and Filtrations. THEORY OF PROBABILITY AND ITS APPLICATIONS 2011. [DOI: 10.1137/s0040585x97984656] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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104
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Alivon M, Bozec E, Herbert A, Laurent S, Boutouyrie P. P6.18 COMPARISON OF ARTERIAL STIFFNESS ASSESSED BY ARTERIOGRAPH WITH ARTERIAL STIFFNESS ASSESSED BY APPLANATION TONOMETRY AND ECHOTRACKING: A CLINICAL STUDY. Artery Res 2011. [DOI: 10.1016/j.artres.2011.10.103] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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105
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Zanoli L, Alivon M, Estrugo N, Ecriou G, Ketthab H, Pruny J, Castellino P, Yanes S, Laude D, Bean K, Thomas F, Empana J, Jouven X, Laurent S, Boutouyrie P. P1.07 CAROTID FUNCTION AND BARORECEPTOR SENSITIVITY IN MODERATE CHRONIC KIDNEY DISEASE: THE EPP3 STUDY. Artery Res 2011. [DOI: 10.1016/j.artres.2011.10.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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106
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Hering D, Czechowicz K, Nowak R, Kucharska W, Brands P, Boutouyrie P, Laurent S, Narkiewicz K. 5.1 COMMON CAROTID ARTERY PROPERTIES ARE RELATED TO SYMPATHETIC OUTFLOW AND CARDIOVASCULAR VARIABILITY. Artery Res 2011. [DOI: 10.1016/j.artres.2011.10.219] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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107
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Zanoli L, Alivon M, Empana J, Estrugo N, Ecriou G, Ketthab H, Pruny J, Castellino P, Yanes S, Laude D, Bean K, Thomas F, Jouven X, Laurent S, Boutouyrie P. 3.2 SPECTRAL ANALYSIS OF CAROTID DISTENSION RATE AND R–R INTERVAL (SPONTANEOUS BAROREFLEX ACTIVITY) PREDICTS CORONARY HEART DISEASE RISK IN PATIENTS WITH MODERATE CHRONIC KIDNEY DISEASE AND IN THOSE WITH NORMAL RENAL FUNCTION: THE EPP3 STUDY. Artery Res 2011. [DOI: 10.1016/j.artres.2011.10.214] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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108
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Laurent S, Le Parc JM, Clérici T, Bréban M, Mahé E. Onset of psoriasis following treatment with tocilizumab. Br J Dermatol 2010; 163:1364-5. [PMID: 20731650 DOI: 10.1111/j.1365-2133.2010.10005.x] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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109
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Laurent S, Vander Elst L, Henoumont C, Muller RN. How to measure the transmetallation of a gadolinium complex. CONTRAST MEDIA & MOLECULAR IMAGING 2010; 5:305-8. [DOI: 10.1002/cmmi.388] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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110
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Lurbe E, Cifkova R, Cruickshank J, Dillon M, Ferreira I, Invitti C, Kuznetsova T, Laurent S, Mancia G, Morales-Olivas F, Rascher W, Redon J, Schaefer F, Seeman T, Stergiou G, Wühl E, Zanchetti A. Manejo de la hipertensión arterial en niños y adolescentes: recomendaciones de la Sociedad Europea de Hipertensión. An Pediatr (Barc) 2010; 73:51.e1-28. [DOI: 10.1016/j.anpedi.2010.04.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2010] [Revised: 03/04/2010] [Accepted: 04/06/2010] [Indexed: 01/20/2023] Open
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111
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Henoumont C, Vander Elst L, Laurent S, Muller RN. Synthesis and physicochemical characterization of Gd-C4-thyroxin-DTPA, a potential MRI contrast agent. Evaluation of its affinity for human serum albumin by proton relaxometry, NMR diffusometry, and electrospray mass spectrometry. J Phys Chem B 2010; 114:3689-97. [PMID: 20175550 DOI: 10.1021/jp910961j] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Gd-C(4)-thyroxin-DTPA, a potential MRI contrast agent, was synthesized from Gd-DTPA and thyroxine, which interacts strongly with human serum albumin (HSA). It was characterized in water by its relaxometric properties and its stability versus zinc transmetalation. The affinity of the complex for HSA was studied by using three different methods: proton relaxometry, NMR diffusometry, and electrospray mass spectrometry. From the results, it appears that Gd-C(4)-thyroxin-DTPA exhibits a relatively high relaxivity (r(1) = 9.01 s(-1) mM(-1) at 1.5 T and 310 K), a good stability versus zinc transmetalation, and a strong interaction with HSA (K(a) approximately 10,000 M(-1) with two binding sites). The kinetics of the exchange between the bound and the free form of the complex was evaluated by the NMR diffusometry technique. Competition experiments have allowed the assignment of the chelate's binding site on HSA.
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112
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Kreutz R, Ferri C, Boehm M, Brunner H, Erdine S, Kolloch R, Laurent S, Persu A, Redon J, Schmieder R, Koch W. INVESTIGATING THE CRITICAL SITUATION IN HYPERTENSION MANAGEMENT: DISPARITIES BETWEEN THE PERCEPTION AND REALITY OF THE BURDEN OF ‘CHALLENGING PATIENTS’ (SHARE SURVEY): PP.26.55. J Hypertens 2010. [DOI: 10.1097/01.hjh.0000379593.35444.ab] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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113
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Cohen-Gogo S, Marioni G, Laurent S, Brugieres L. CL108 - Fin de vie des adolescents et jeunes adultes en oncologie pédiatrique. Arch Pediatr 2010. [DOI: 10.1016/s0929-693x(10)70306-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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114
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Henoumont C, Laurent S, Vander Elst L. How to perform accurate and reliable measurements of longitudinal and transverse relaxation times of MRI contrast media in aqueous solutions. CONTRAST MEDIA & MOLECULAR IMAGING 2010; 4:312-21. [PMID: 19998320 DOI: 10.1002/cmmi.294] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Knowledge of the longitudinal and transverse relaxation times (T(1) and T(2)) of water protons in an aqueous solution of an MRI contrast agent is essential for its characterization. These parameters can be measured at low field on low resolution spectrometers or at high field on high resolution spectrometers. The reliability and the accuracy of T(1) and T(2) measurements rely on several experimental settings and on the equation used to fit the data. Examples of the importance of careful adjustment of the most important parameters are illustrated through several measurements performed on a low-resolution, low-magnetic field instrument. In addition, some specificities of T(1) and T(2) measurements on high-resolution, high-magnetic field spectrometers are pointed out.
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115
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Radermacher K, Boutry S, Laurent S, Mahieu I, Vander Elst L, Bouzin C, Magat J, Grégoire V, Feron O, Muller R, Jordan B, Gallez B. 71 poster: Iron Oxide Particles Covered with Hexapeptides Targeted at Phosphatidylserine as MR Biomarkers of Tumor Cell Death. Radiother Oncol 2010. [DOI: 10.1016/s0167-8140(15)34490-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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116
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Laurent S, Boutry S, Mahieu I, Vander Elst L, Muller RN. Iron oxide based MR contrast agents: from chemistry to cell labeling. Curr Med Chem 2010; 16:4712-27. [PMID: 19903138 DOI: 10.2174/092986709789878256] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2009] [Accepted: 11/25/2009] [Indexed: 11/22/2022]
Abstract
Superparamagnetic iron oxide nanoparticles can be used for numerous applications such as MRI contrast enhancement, hyperthermia, detoxification of biological fluids, drug delivery, or cell separation. In this work, we will summarize the chemical routes for synthesis of iron oxide nanoparticles, the fluid stabilization, and the surface modification of superparamagnetic iron oxide nanoparticles. Some examples of the numerous applications of these particles in the biomedical field mainly as MRI negative contrast agents for tissue-specific imaging, cellular labeling, and molecular imaging will be given. Larger particles or particles displaying a non-neutral surface (thanks to their coating or to a cell transfection agent with which they are mixed) are very useful tools, although the cells to be labeled have no professional phagocytic function. Labeled cells can then be transplanted and monitored by MRI in a broad spectrum of applications. Direct in vivo magnetic labeling of cells is mainly performed by intravenous injection of long-circulating iron oxide-based MRI contrast agents, which can extravasate and/or undergo a cellular uptake in an amount sufficient to allow an MRI visualization of areas of interest such as inflamed regions or tumors. Particles with long circulation times, or able to induce a strong negative effect individually have been also modified by conjugation to a ligand, so that their cellular uptake, or at least their binding to the cell surface, could occur through a specific ligand-receptor interaction, in vivo as well as in vitro. Thus, experimentally as well as in a few trials on humans, iron oxide particles currently find promising applications.
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117
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Laurent S, Thibaud JL, Hordeaux J, Reyes-Gomez E, Delisle F, Blot S, Colle MA. Chronic traumatic brain injury in a dog. J Comp Pathol 2010; 143:75-80. [PMID: 20106486 DOI: 10.1016/j.jcpa.2009.12.008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2009] [Revised: 10/27/2009] [Accepted: 12/19/2009] [Indexed: 11/30/2022]
Abstract
Chronic traumatic brain injury is rare in man and has not been previously documented in dogs. This report describes a 2-year-old female American Staffordshire bull terrier that was referred with forelimb and hindlimb ataxia, decreased vigilance and disorientation following repeated aggression and physical abuse by its owner. A diffuse cortical lesion was suspected. Cerebrospinal fluid analysis revealed neutrophilic pleocytosis and computed tomography showed marked widening of the cerebral sulci with mild bilateral ventriculomegaly. The dog was humanely destroyed in view of the poor prognosis. Necropsy examination revealed narrowing of the cerebral cortical gyri and consequent widening of the sulci without distortion or displacement of the neural parenchyma. These features were consistent with bilateral diffuse cortical atrophy. Microscopically, there were chronic subarachnoid haemorrhages and the cortical subpial layer displayed spongiosis, capillary hyperplasia, astrocytosis, microgliosis and frequent neuronal necrosis occurring in a characteristic laminar pattern. This histopathological pattern of damage was significantly different from that previously described in people suffering from repeated traumatic brain injuries over a long period of time.
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118
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Alivon M, Ong K, Khettab H, Yanes S, Pruny J, Bozec E, Empana J, Pannier B, Laurent S, Beaussier H, Boutouyrie P. 6.2 LARGE ARTERY STIFFNESS ASSESSMENT WITH ARTERIOGRAPH DEVICE. Artery Res 2010. [DOI: 10.1016/j.artres.2010.10.179] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
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119
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Laurent S, Grayet D, Lavigne C. Acute and chronic gastric volvulus: radical different prognosis and management. Case report. Acta Chir Belg 2010; 110:76-9. [PMID: 20306915 DOI: 10.1080/00015458.2010.11680570] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Gastric volvulus is an uncommon entity. Management is principally surgical. Diagnosis is often delayed because of the non-specific nature of the symptoms. The authors report two cases of gastric volvulus seen in a six month period. The first is an acute presentation diagnosed by computed tomography with incarceration and necrosis of the stomach, the transverse colon and great omentum. The issue was immediate laparotomy for total gastrectomy, colectomy, terminal colostomy and omentectomy. The patient survived, and the colostomy was closed and continuity restored three months later. The second one is a chronic form diagnosed by gastroscopy and barium swallow radiography. The treatment was elective with closure of the hiatus, Nissen procedure and gastropexy. The pathophysiology, classification and treatment of those two kinds of volvulus are briefly reviewed.
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Ong K, Delerme S, Pannier B, Laurent S, Boutouyrie P. P9.04 AORTIC STIFFNESS IS REDUCED BEYOND BLOOD PRESSURE LOWERING BY SHORT AND LONG-TERM ANTIHYPERTENSIVE TREATMENT: A META-ANALYSIS OF INDIVIDUAL DATA IN 294 PATIENTS. Artery Res 2010. [DOI: 10.1016/j.artres.2010.10.096] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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121
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Engelen L, Boutouyrie P, Ferreira I, Stehouwer C, Laurent S. P8.01 REFERENCE VALUES FOR CAROTID STIFFNESS AND IMT. Artery Res 2010. [DOI: 10.1016/j.artres.2010.10.083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
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122
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Collin C, Revera M, Mazoyer B, Laurent S, Tzourio C, Boutouyrie P, Dufouil C. P3.03 ARTERIAL STIFFNESS IS ASSOCIATED WITH A HIGHER RISK OF EXTEND PERIVENTRICULAR AND DEEP WHITE MATTER LESIONS ACCORDING TO GENDER IN ELDERLY. Artery Res 2010. [DOI: 10.1016/j.artres.2010.10.046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
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123
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Laurent S, Vander Elst L, Muller RN. Lanthanide complexes for magnetic resonance and optical molecular imaging. THE QUARTERLY JOURNAL OF NUCLEAR MEDICINE AND MOLECULAR IMAGING : OFFICIAL PUBLICATION OF THE ITALIAN ASSOCIATION OF NUCLEAR MEDICINE (AIMN) [AND] THE INTERNATIONAL ASSOCIATION OF RADIOPHARMACOLOGY (IAR), [AND] SECTION OF THE SOCIETY OF... 2009; 53:586-603. [PMID: 20016451] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Lanthanide complexes are more and more used in biomedical imaging as contrast agents (CA). The development of these paramagnetic complexes as CA for medical magnetic resonance imaging (MRI) and luminescent probes for optical imaging is very complementary. Gd complexes are well known as CA for MRI and Eu/Tb complexes are often used in microscopy or fluorescence imaging. Each imaging technique has its limitation: low sensitivity but high spatial resolution for MRI and limited penetration but high sensitivity for optical imaging. A bimodal agent can be used for these two methods and give more informations, they can be visualized simultaneously by light and MR imaging. Such compounds are based on the coordination chemistry of the lanthanide ions with an organic ligand to form a stable complex and on the properties of the lanthanide ions. Gd complexes with a chromophore allows also the luminescent detection. This review describes the properties of the lanthanide ions and of their complexes and gives some typical applications of the complexes. The luminescence properties show high quantum yield and long luminescence lifetimes. The relaxometric data of the Gd complexes are comparable or higher than commercial and clinically Gd-DTPA derivatives.
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Foitzik S, Bauer S, Laurent S, Pennings PS. Genetic diversity, population structure and sex-biased dispersal in three co-evolving species. J Evol Biol 2009; 22:2470-80. [PMID: 19888940 DOI: 10.1111/j.1420-9101.2009.01863.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Genetic diversity and spatial structure of populations are important for antagonistic coevolution. We investigated genetic variation and population structure of three closely related European ant species: the social parasite Harpagoxenus sublaevis and its two host species Leptothorax acervorum and Leptothorax muscorum. We sampled populations in 12 countries and analysed eight microsatellite loci and an mtDNA sequence. We found high levels of genetic variation in all three species, only slightly less variation in the host L. muscorum. Using a newly introduced measure of differentiation (Jost's D(est)), we detected strong population structuring in all species and less male-biased dispersal than previously thought. We found no phylogeographic patterns that could give information on post-glacial colonization routes - northern populations are as variable as more southern populations. We conclude that conditions for Thompson's geographic mosaic of coevolution are ideal in this system: all three species show ample genetic variation and strong population structure.
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Laurent S, Vander Elst L, Henrotte V, Muller RN. CMR2009: 5.08: StructureâHSA affinity relationship of some new Gd-DTPA derivatives. CONTRAST MEDIA & MOLECULAR IMAGING 2009. [DOI: 10.1002/cmmi.327] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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