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Laurent T. Change and progress.... Life as they see it. The Education Committee of NATN write on issues that concern or interest them. BRITISH JOURNAL OF PERIOPERATIVE NURSING : THE JOURNAL OF THE NATIONAL ASSOCIATION OF THEATRE NURSES 2000; 10:404. [PMID: 11261004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
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De Bolle X, Laurent T, Tibor A, Godfroid F, Weynants V, Letesson JJ, Mertens P. Antigenic properties of peptidic mimics for epitopes of the lipopolysaccharide from Brucella. J Mol Biol 1999; 294:181-91. [PMID: 10556037 DOI: 10.1006/jmbi.1999.3248] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The lipopolysaccharide (LPS) is up to now the only identified major virulence determinant of Brucella. This bacterium is responsible for brucellosis in animals and for Malta fever in humans. Several monoclonal antibodies (mAbs) directed against various LPS epitopes have been characterized. Two mAbs, named A15-6B3 and B66-2C8, directed against distinct LPS epitopes have been used to select peptides from 11 phage display libraries. The sequences of the selected peptides contain an overrepresentation of either proline or tryptophan residues when selected with either A15-6B3 or B66-2C8 mAbs, respectively. For the best binding peptides, competition with LPS for the binding to the mAb is detected, which suggests that the peptides bind to the paratope of the mAb. The phages selected from the libraries were used to immunise mice, and a weak antibody response directed against LPS has been observed. These data suggest that a subset of the selected peptides are mimotopes of the LPS epitopes.
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Le Gall F, Laurent T, Rochcongar P. Évolution de la force musculaire des fléchisseurs et extenseurs du genou mesurée par dynamomètre isocinétique concentrique chez le footballeur de haut niveau. Sci Sports 1999. [DOI: 10.1016/s0765-1597(99)80065-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Gérard B, Thierry M, Didier C, Laurent T, Pierre G, Thierry CL. Intra-observer concordance of the Neuroradiologic Reviewing Committee in CT scan reviewing in MAST-E. Multicenter Acute Stroke Trial-Europe. Acta Neurol Scand 1998; 98:292-3. [PMID: 9808282 DOI: 10.1111/j.1600-0404.1998.tb07312.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Gudinchet F, Maeder P, Laurent T, Meyrat B, Schnyder P. Magnetic resonance detection of myelodysplasia in children with Currarino triad. Pediatr Radiol 1997; 27:903-7. [PMID: 9388278 DOI: 10.1007/s002470050267] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
PURPOSE To evaluate the role of MRI in the detection of myelodysplasia in children with Currarino triad. MATERIALS AND METHODS Six patients (two girls, four boys, aged 7 months-14 years, mean age 6 years) were studied with MRI, voiding cystourethrogram and barium enema or fistulography. CT and ultrasonography were also performed in two patients. RESULTS All patients presented with partial agenesis of the sacrum. Three patients suffered from an intermediate form of anorectal malformation (ARM) and three had a high form of ARM. The presacral masses consistent with Currarino triad included anterior meningocoele in three patients, lipoma in two patients and anterior lipomeningocoele in one patient. MRI diagnosed tethering of the spinal cord in four of six patients. The tethering of the spinal cord was due to a lipomeningocoele in one patient, an intradural lipoma in one patient and a lipoma of the filum in two patients. CONCLUSION The association of Currarino triad with tethered spinal cord seems more common than generally reported in the literature. Preoperative MRI of the lumbosacral spine is essential to detect significant myelodysplasia in all patients with Currarino triad.
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Brownsword RA, Hillenkamp M, Laurent T, Volpp HR, Wolfrum J, Vatsa RK, Yoo HS. H atom formation dynamics in the dissociation of CH3–CF2Cl (HCFC-142b) after UV and VUV laser photoexcitation. J Chem Phys 1997. [DOI: 10.1063/1.474376] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
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Brownsword RA, Laurent T, Hillenkamp M, Vatsa RK, Volpp HR. Dissociation dynamics of HNCO and DNCO after laser photoexcitation in the vacuum ultraviolet. J Chem Phys 1997. [DOI: 10.1063/1.473857] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
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Brownsword RA, Hillenkamp M, Laurent T, Vatsa RK, Volpp HR. Photodissociation dynamics in the UV laser photolysis of DNCO: Comparison with HNCO. J Chem Phys 1997. [DOI: 10.1063/1.473489] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Brownsword RA, Hillenkamp M, Laurent T, Vatsa RK, Volpp HR, Wolfrum J. Photodissociation dynamics of the chloromethanes at the Lyman-α wavelength (121.6 nm). J Chem Phys 1997. [DOI: 10.1063/1.473304] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
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Laurent T, de Grandi P, Schnyder P. Abdominal actinomycosis associated with intrauterine device: CT features. Eur Radiol 1996; 6:670-3. [PMID: 8934133 DOI: 10.1007/bf00187670] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Abdominal actinomycosis is a severe and progressive peritoneal infection, due to an anerobic gram-positive bacterium, Actinomyces israelii. The presence of a long-standing intrauterine device (IUD) is a well-known risk factor in young women. We report two cases of pelviperitoneal actinomycosis appearing in two young women with acute low abdominal pain. Abdominal CT demonstrated multiple solid or encapsulated peritoneal masses with marked contrast enhancement and infiltration of the adjacent mesenteric fat. Laparoscopy confirmed the presence of intraperitoneal abscesses which contained Actinomyces israelii. High doses of amoxicillin and clavulanic acid (Augmentine) were given and following CT scan after 2 and 6 weeks showed a slow, but complete, resolution of the lesions. Although the radiologic presentation of actinomycosis is nonspecific, the diagnosis should be raised in the presence of pseudotumoral mesenteric infiltration, particularly in young women with an IUD. Abdominal CT is a useful method for diagnosis and for follow-up.
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Brownsword R, Hillenkamp M, Laurent T, Vatsa R, Volpp HR, Wolfrum J. Dynamics of the H + D2O → D + HOD hydrogen exchange reaction. Chem Phys Lett 1996. [DOI: 10.1016/0009-2614(96)00825-1] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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Brownsword R, Laurent T, Vatsa R, Volpp HR, Wolfrum J. Photodissociation dynamics of HNCO at 248 nm. Chem Phys Lett 1996. [DOI: 10.1016/0009-2614(96)00626-4] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Brownsword R, Laurent T, Vatsa R, Volpp HR, Wolfrum J. Branching ratio for the H + NCO channel in the 193 nm photodissociation of HNCO. Chem Phys Lett 1996. [DOI: 10.1016/0009-2614(95)01409-8] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Laurent T, Markert M, Feihl F, Schaller MD, Perret C. Oxidant-antioxidant balance in granulocytes during ARDS. Effect of N-acetylcysteine. Chest 1996; 109:163-6. [PMID: 8549180 DOI: 10.1378/chest.109.1.163] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
The production of cytotoxic oxygen radicals by activated granulocytes is a proposed mechanism of lung injury in ARDS. Protective effects of N-acetylcysteine (NAC) have been described in experimental and clinical ARDS. NAC could act in part by replenishing the intracellular stores of glutathione (GSH) in activated granulocytes, leading to detoxification of oxygen radicals produced by these cells. To test this hypothesis, 16 patients in the early phase of ARDS were randomized to receive either NAC (n = 8) or placebo (n = 8); granulocyte GSH, granulocyte oxygen radical production, and plasma levels of granulocyte elastase were measured in blood samples drawn sequentially within 8 h after the onset of ARDS (day 0), and then 24 (day 1), 72 (day 3), and 120 h (day 5) after the first sample; treatment with NAC or placebo was started immediately after day 0 and stopped just after day 3. Granulocyte GSH was significantly higher on days 1 and 3 when NAC was received by the patient. Unstimulated oxygen radical production, as measured ex vivo by luminol- and lucigenin-amplified chemiluminescence (CL), was higher in granulocytes from ARDS patients than from healthy control subjects, but was not influenced by NAC. The plasma levels of granulocyte elastase were five to eight times above the upper normal limit on day 0, decreased steadily until day 5, and were uninfluenced by NAC. In summary, parenteral NAC treatment started within 8 h of diagnosis increases the intracellular GSH in the granulocytes of ARDS patients without decreasing spontaneous oxidant production by these cells. The mechanisms of the protective effects of this drug previously reported in experimental and clinical ARDS remain to be established.
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Laurent T, Lillich H, Volpp HR, Wolfrum J, Bar I, Melchior A, Rosenwaks S. State-resolved dynamics of the O(1D) + CHF2Cl → OH + CF2Cl reaction. Chem Phys Lett 1995. [DOI: 10.1016/s0009-2614(95)01230-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Laurent T, Fournier D, Doenz F, Karaaslan T, Wassmer FA. Complex lesion of the gastric wall: an unusual presentation of ectopic pancreas. JOURNAL OF CLINICAL ULTRASOUND : JCU 1995; 23:438-441. [PMID: 7560159 DOI: 10.1002/jcu.1870230709] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
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Laurent T, Meuli R, Landry M, Leyvraz PF. [Correlation between arthroscopy and MRI in the diagnosis of meniscal tears of the knee]. PRAXIS 1995; 84:335-340. [PMID: 7701172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
The sensibility and specificity of MRI diagnosis of meniscal tears are still debated. We compared the radiologic and arthroscopic diagnosis of 37 patients who underwent MRI study of the knee, followed by arthroscopic surgery. Meniscal lesions were classified according to their size and the grading system of Lotysch and Crues (1). In patients without previous arthroscopic surgery (n = 32), 92% of the grade-3b lesions are found to be torn at surgery. The probability for tears is weaker for grade-3a lesions (one meniscus torn out of three). An intact or slightly degenerated meniscus on MRI (grades 1 and 2) relates in 91% of cases to a normal fibrocartilage at arthroscopy. In patients with previous knee surgery (n = 5), the specificity of MRI for grade-3b lesions is weak (55%), owing to the presence of granulation tissue. Our results agree with those of recent publications, confirming the high value of MRI in the diagnosis of traumatic or degenerative meniscal tears. The use of a grading system incorporating the size of the lesion gives a better specificity to MRI diagnosis.
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Laurent T, Markert M, Von Fliedner V, Feihl F, Schaller MD, Tagan MC, Chiolero R, Perret C. CD11b/CD18 expression, adherence, and chemotaxis of granulocyte in adult respiratory distress syndrome. Am J Respir Crit Care Med 1994; 149:1534-8. [PMID: 7911707 DOI: 10.1164/ajrccm.149.6.7911707] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
The accumulation of granulocytes in the pulmonary microvasculature is generally thought a cardinal event in the pathology of adult respiratory distress syndrome (ARDS). However, the mechanism by which granulocytes are sequestered in the pulmonary vascular bed remains largely unknown. Because the CD11b/CD18 membrane receptors mediate various adhesion-dependent functions, their expression was investigated in granulocytes from patients during the course of ARDS development in relation to adherence and chemotaxis. CD11b expression of ARDS resting granulocytes was increased within 24 h of ARDS onset by a factor of two in comparison with control patients (p < 0.05) and remained significantly increased 72 to 120 h later. In contrast, the stimulated expression was significantly decreased only within 24 h of ARDS onset. Adherence was not modified within 8 h of the onset of ARDS, but was increased at Days 1, 3, and 5. The time course of granulocyte chemotaxis shows a decreased chemotaxis capacity during the first 3 d of ARDS, followed by normalization at Day 5. The dynamic changes observed in the various functions studied indicate a possible relationship between the modulation of the CD11b expression and a hyperadhesive state of granulocytes in ARDS. These sticky granulocytes may potentially contribute to the microvascular injury.
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Wells A, Larsson E, Hanás E, Laurent T, Hällgren R, Tufveson G. Increased hyaluronan in acutely rejecting human kidney grafts. Transplantation 1993; 55:1346-9. [PMID: 8516820 DOI: 10.1097/00007890-199306000-00025] [Citation(s) in RCA: 60] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
The glycosaminoglycan hyaluronan is not only involved in cellular differentiation and migration but may also play a role in several inflammatory diseases. We have previously demonstrated an increased local production of hyaluronan in chronically rejected kidneys and the correspondingly affected renal vessels. In this report, we demonstrate the presence of hyaluronan in acutely rejecting kidneys. A total of 77 biopsies classified as either acute rejection or nonrejecting were analyzed using a biotin-labeled hyaluronan-binding protein in conjunction with an avidin-biotin peroxidase detection system and graded using an arbitrary scale from 0 to 3. Those biopsies classified as nonrejecting did not contain any peritubular hyaluronan in the cortex, with hyaluronan being localized only in the medulla. In contrast, those biopsies exhibiting acute rejection had an increase of hyaluronan both in the cortex and in the medulla. This increase was significantly different (P = 0.0001) and correlated with edema and interstitial inflammation. The detection of the local hyaluronan production may be a useful marker to measure acute rejection episodes.
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Wells A, Larsson E, Fellström B, Tufveson G, Klareskog L, Laurent T. Role of hyaluronan in chronic and acutely rejecting kidneys. Transplant Proc 1993; 25:2048-9. [PMID: 8470267] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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Järnefelt J, Laurent T, Rigler R. Diffusion of fluorescein-labelled molecules in suspensions of erythrocyte ghosts. FEBS Lett 1988; 242:129-33. [PMID: 2462510 DOI: 10.1016/0014-5793(88)81000-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The diffusion of fluorescein isothiocyanate-labelled dextran molecules in suspensions of centrifugally, tightly packed, erythrocyte ghosts was measured by fluorescence recovery after photobleaching. In comparison with diffusion in aqueous solution, the diffusion coefficients for probe molecules of varying size were about two orders of magnitude smaller. It was established that the dextran molecules remained in the space between the ghosts. Since crosslinking membrane surface carbohydrates with antibodies further inhibits diffusion, it is assumed that interactions between surface carbohydrates and the probe molecules are the cause of slow diffusion. Two alternative models are discussed.
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Edelstein MB, Schellekens H, Laurent T, Gauci L. A phase I clinical tolerance study of rDNA alpha 2 human interferon in patients with non-reticuloendothelial system malignancies. EUROPEAN JOURNAL OF CANCER & CLINICAL ONCOLOGY 1983; 19:891-4. [PMID: 6350014 DOI: 10.1016/0277-5379(83)90053-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Twenty-seven patients with non-reticuloendothelial malignancies were treated with a single intramuscular injection of recombinant leukocyte alpha 2 interferon (rIFN) to assess clinical tolerance and define a maximum tolerated dose. A single patient in each of six increasing dosage groups (0.3 X 10(6) IU, 1 X 10(6) IU, 3 X 10(6) IU, 10 X 10(6) IU, 30 X 10(6) IU, 100 X 10(6) IU) received a low dose (0.01 X 10(6) IU) and served as a control for subjective and objective toxicity measurements. Severe fatigue proved dose-limiting at 100 X 10(6) IU, and all dosages above 3.0 X 10(6) IU produced one or more signs or symptoms, which typically resembled a 'flu-like' syndrome. Objective toxicity was mild to moderate (leukopenia, thrombopenia) and no toxicities were found not already known from work with interferon obtained directly from leukocytes. Evidence of an antitumor effect was apparent in 3/19 evaluable patients.
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Helting T, Ogren S, Lindahl U, Pertoft H, Laurent T. Glycosaminoglycan synthesis in mouse mastocytoma. Biochem J 1972; 126:587-92. [PMID: 4263037 PMCID: PMC1178415 DOI: 10.1042/bj1260587] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The glycosaminoglycan synthesis in Furth solid mastocytoma tissue has been studied. Approx. 10% of the polysaccharide isolated after incubation in vitro with [(14)C]-glucosamine was digestible with chondroitinase ABC and the product of digestion was identified as 2-acetamido-2-deoxy-3-O-(beta-d-gluco-4-enepyranosyluronic acid)-4-O-sulpho-d-galactose. Similarly, labelling of polysaccharide in vivo with (35)SO(4) (2-) followed by isolation of mast-cell fractions by density-gradient centrifugation on colloidal silica revealed the presence of a polysaccharide which migrated as did chondroitin sulphate on electrophoresis in barium acetate. Chondroitinase ABC produced the same digestion product as before. Finally, the presence of the UDP-N-acetylgalactosamine-chondroitin 6-sulphate hexasaccharide N-acetylgalactosaminyltransferase previously implicated in chondroitin sulphate biosynthesis was demonstrated in microsomal particles from fractions of purified mast cells.
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Bertani G, Torheim B, Laurent T. Multiplication in Serratia of a bacteriophage originating from Escherichia coli: Lysogenization and host-controlled variation. Virology 1967; 32:619-32. [DOI: 10.1016/0042-6822(67)90038-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Lindahl KM, Laurent T, Palmstierna H, Linderot T, Veige S, Diczfalusy E. On the Biological Methylation of Histamine. ACTA ACUST UNITED AC 1958. [DOI: 10.3891/acta.chem.scand.12-1690] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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