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Wallimann M, Bouayed K, Cannizzaro E, Kaiser D, Belot A, Merlin E, Poignant S, Wouters C, Hofer F, Saurenmann T, Koryllou A, Carlomagno R, Mejbri M, Hofer M, Theodoropoulou K. Disease evolution in systemic juvenile idiopathic arthritis: an international, observational cohort study through JIRcohort. Pediatr Rheumatol Online J 2023; 21:96. [PMID: 37679749 PMCID: PMC10485973 DOI: 10.1186/s12969-023-00886-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/29/2023] [Accepted: 08/31/2023] [Indexed: 09/09/2023] Open
Abstract
BACKGROUND Systemic juvenile idiopathic arthritis (systemic JIA) is a severe disease with both systemic and joint inflammation. This study aims to identify predictors of disease evolution within the systemic JIA population enrolled in the Juvenile Inflammatory Rheumatism cohort (JIRcohort). METHODS Observational patient cohort study with 201 recruited children from 4 countries (3 European, 1 North Africa) from 2005 until 2019, using retrospectively (2005-2015) and prospectively (2015-2019) routine care collected data. RESULTS Sixty-five patients with complete follow-up data for 24 months after first diagnosis were classified as monophasic (n = 23), polyphasic (n = 6) or persistent group (n = 36) corresponding to their evolution (unique flare, recurrent flares, or persistent disease activity respectively). The patients of the persistent group were more likely to have an earlier disease onset, before the age of 6 (OR 2.57, 95%-CI 0.70-9.46), persistence of arthritis at 12-months post-diagnosis (OR 4.45, 95%-CI 0.58-34.20) and higher use of synthetic DMARD (sDMARD, OR 5.28, 95%-CI 1.39-20.01). Other variables like global assessment by physician and by patient and C Reactive Protein levels at 12-months post-diagnosis were assessed but without any predictive value after adjusting for confounding factors. CONCLUSIONS Our results suggest that the earlier disease onset, the persistence of arthritis throughout the first year of disease evolution and the need of sDMARD might predict a persistent disease course.
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Affiliation(s)
- M Wallimann
- Department of Woman, Mother, Child, Unit of Pediatric Immunology, Allergology and Rheumatology, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
| | - K Bouayed
- Department of Pediatrics, Unit of Rheumatology and Nephrology, Mother and Child University Hospital A. Harouchi, CHU Ibn Rochd, Casablanca, Morocco
- Faculty of Medicine and Pharmacy, Hassan II University, Casablanca, Morocco
| | - E Cannizzaro
- Department of Pediatrics, Unit of Pediatric Rheumatology, University Children's Hospital, Zurich, Switzerland
| | - D Kaiser
- Department of Pediatrics, Unit of Pediatric Rheumatology, Childrens Hospital Lucerne, Lucerne, Switzerland
| | - A Belot
- Department of Pediatrics, Unit of Pediatric Nephrology, Rheumatology, Dermatology, Hospital Femme Mère Enfant, Hospices Civils de Lyon, Bron, France
| | - E Merlin
- Department of Pediatrics, Clermont-Ferrand University Hospital, Clermont-Ferrand, F-63000, France
| | - S Poignant
- Department of Pediatrics, University Hospital of Nantes, Nantes, France
| | - C Wouters
- Department of Pediatrics, Unit of Pediatric Rheumatology, University Hospital Leuven, Louvain, Belgium
| | - F Hofer
- Fondation Rhumatismes-Enfants-Suisse, Etoy, 1163, Switzerland
| | - T Saurenmann
- Department of Pediatrics, Cantonal Hospital Winterthur, Winterthur, Switzerland
| | - A Koryllou
- Department of Woman, Mother, Child, Unit of Pediatric Immunology, Allergology and Rheumatology, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
| | - R Carlomagno
- Department of Woman, Mother, Child, Unit of Pediatric Immunology, Allergology and Rheumatology, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
| | - M Mejbri
- Department of Woman, Mother, Child, Unit of Pediatric Immunology, Allergology and Rheumatology, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
| | - M Hofer
- Department of Woman, Mother, Child, Unit of Pediatric Immunology, Allergology and Rheumatology, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
| | - K Theodoropoulou
- Department of Woman, Mother, Child, Unit of Pediatric Immunology, Allergology and Rheumatology, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland.
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Schvartz A, Kechiche R, Bajolle F, Poignant S, Basmaci R, Pajot C, Melki I, Morin L, Adamsbaum C, Matsa N, Hofer M, Koné-Paut I, Galeotti C. POS1284 PAINFUL CERVICAL INVOLVEMENT AND FEBRILE TORTICOLLIS: A FREQUENT SYMPTOM OF PIMS. Ann Rheum Dis 2022. [DOI: 10.1136/annrheumdis-2022-eular.5298] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
BackgroundPediatric Inflammatory Multisystemic Syndrome associated to SARS-CoV2 (PIMS) happens 4 to 6 weeks after SARS-CoV2 infection1-2. Its early diagnostic recognition as well as its early management is important to avoid cardiac complications related to this pathology.ObjectivesTo highlight a frequent symptom in PIMS and improve its therapeutic care.MethodsThe JIR Cohort database, an international registry collecting data on patients with pediatric inflammatory diseases, was consulted to include patients between 03/15/20 and 12/31/2021.ResultsOf the 140 patients in whom a diagnosis of PIMS was retained, we present a series of 38 patients (27%) who presented at diagnosis or during evolution, febrile torticollis or painful cervical involvement. These patients were on average 8.2 years old (0.6-15.2). The proportion of boys was 14 out of 38 (37%). Twenty-four patients out of 33 (73%) were hospitalized in intensive care. Ten patients out of 38 (26%) underwent cervical imaging, 5 (50%) had abnormalities such as collection or infiltration of the soft tissues. At the therapeutic level, 27/38 patients (71%) received corticosteroid therapy, 33/38 (87%) immunoglobulins, and 26/38 (68%) antibiotic therapy.ConclusionPIMS is a pathology with significant clinical heterogeneity and severe consequences in case of delay in therapeutic management. In this epidemic context, it is important to consider PIMS in any patient with febrile torticollis, especially if he does not respond to antibiotics.References[1]Feldstein LR, Rose EB, Horwitz SM, Collins JP, Newhams MM, Son MBF, et al. Multisystem Inflammatory Syndrome in U.S. Children and Adolescents. N Engl J Med. 23 juill 2020.[2]Whittaker E, Bamford A, Kenny J, Kaforou M, Jones CE, Shah P, et al. Clinical Characteristics of 58 Children With a Pediatric Inflammatory Multisystem Syndrome Temporally Associated With SARS-CoV-2. JAMA. 8 juin 2020Disclosure of InterestsNone declared
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Kechiche R, Schvartz A, Bajolle F, Poignant S, Basmaci R, Pajot C, Meinzer U, Morin L, Lambert V, Dusser P, Matsa N, Hofer M, Koné-Paut I, Caroline G. POS1326 PIMS THROUGH THE WAVES OF COVID 19: DATA FROM THE JIR COHORT. Ann Rheum Dis 2022. [DOI: 10.1136/annrheumdis-2022-eular.5227] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
BackgroundPaediatric inflammatory multisystem Syndrome (PIMS) is a new systemic inflammatory disease linked to SARS-CoV2 that affects children. It was first reported in may 2020 [1-2].ObjectivesThe objectives of this study were to describe patients with PIMS through the international JIR cohort registry and to compare the different profiles and treatments of these patients over the different waves.MethodsStudy patients with international PIMS criteria were included from March 2020 to June 2021. Patients were identified in the JIR cohort, an international registry collecting demographic, clinical and paraclinical data on patients with pediatric inflammatory diseases. Two groups were distinguished: from March 2020 to July 2020 for patients in the first wave, from July 2020 to June 2021 for patients in the 2nd and 3rd waves. These two groups were compared using a Fischer test for categorical data and a Mann-Whitney test for quantitative dataResults136 patients meeting the PIMS criteria were included (64 patients in the 1st wave, 72 patients after). Patients had less frequent myocarditis (51 patients in wave 1 vs. 36 patients after, p=0,0003) and respiratory distress (34 patients vs 10 patients, p<0,0001). Corticosteroids were used more frequently in the second wave (32 patients in wave 1 vs. 67 patients after July 2020, p<0,0001). Intravenous immunoglobulins were used as much over the waves (58 patients in wave 1 vs 68 patients after, p=0.5). Antibiotics were less used since the second wave (53 patients received antibiotics before July 2020 vs 11 after, p<0,0001). The duration of hospitalization decreased significantly (p<0,0001) with a median duration of 9 days during the first wave (interquartile range, 7-12) and 7 days (interquartile range, 5-10) after the first wave.ConclusionThere was a decrease in the number of complications of PIMS, particularly cardiac and respiratory complications, and a decrease in the length of hospitalization over time. The treatment of PIMS has also evolved, with a clear increase in the use of corticosteroids and a decrease in the use of antibiotics.References[1]Riphagen S, Gomez X, Gonzalez-Martinez C, Wilkinson N, Theocharis P (2020) Hyperinflammatory shock in children during COVID-19 pandemic. Lancet 395:1607–1608.[2]Verdoni L, Mazza A, Gervasoni A, Martelli L, Ruggeri M, Ciuffreda M, Bonanomi E, D’Antiga L (2020) An outbreak of severe Kawasaki-like disease at the Italian epicentre of the SARS-CoV-2 epidemic: an observational cohort study. Lancet. 395:1771–1778AcknowledgementsAcknowldgements to the French Covid-19 Paediatric Inflammation Consortium.Disclosure of InterestsNone declared
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Poignant S, Moënne-Loccoz J, Cohen B, Laffon M. Acute postoperative hypoxemic respiratory failure as a result of Chilaiditi's syndrome: contribution of high flow oxygen through nasal cannula. Br J Anaesth 2018; 118:465-466. [PMID: 28203744 DOI: 10.1093/bja/aex029] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Quartier P, Despert V, Poignant S, Elie C, Kone-Paut I, Belot A, Kodjikian L, Monnet D, Weber M, Bodaghi B, Baptiste A. THU0235 Adjuvite: A Double-Blind, Randomized, Placebo-Controlled Trial of Adalimumab in Juvenile Idiopathic Arthritis Associated Uveitis: Table 1. Ann Rheum Dis 2016. [DOI: 10.1136/annrheumdis-2016-eular.2362] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Sanchez E, Grandemange S, Mau-Them FT, Louis-Plence P, Carbasse A, Jeziorski E, Picot MC, Girard M, Tran TA, Isidor B, Poignant S, Tiriau S, Pillet P, Jurquet AL, Touitou I, Geneviève D. Identification of rare genetic variants in Juvenile Idiopathic Arthritis using whole exome sequencing. Pediatr Rheumatol Online J 2015. [PMCID: PMC4599929 DOI: 10.1186/1546-0096-13-s1-p144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Poullaouec C, Isnar J, Le Francois T, Querre M, Barbarot S, Aubert H, Poignant S, Tiriau S, Allain-Launay E. CO-61 – Apport de l'IRM dans le diagnostic des DMJ au CHU de Nantes. Arch Pediatr 2015. [DOI: 10.1016/s0929-693x(15)30161-5] [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: 11/29/2022]
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Piram M, Koné-paut I, Djemoui A, Dallochio A, Lechevalier P, Gajdos V, Launay E, Eyssette-Guerreau S, Ballot C, Michelet I, Poignant S, Leblanc A, Arnoux A, Tran TA. AB0754 Kawanet: The french registry for kawasaki disease (KD). Ann Rheum Dis 2013. [DOI: 10.1136/annrheumdis-2012-eular.754] [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: 11/04/2022]
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Abstract
UNLABELLED We report on a 5-year-old boy with hyperzincemia and hypercalprotectinemia. Treatment began with Tacrolimus at the age of 4 years and 6 months. Despite an initial correction of clinical and biological symptoms, zincemia and calprotectinemia progressively worsened with secondary reappearance of symptoms. CONCLUSION Tacrolimus seems to have a transient effect in the treatment of Hyperzincemia and hyperprolactinemia.
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Affiliation(s)
- B Isidor
- Service de Génétique Médicale, Centre Hospitalo-Universitaire, Nantes, France.
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Frot AS, Barbarot S, Poignant S, Guyot C, Stalder JF. Angiœdèmes à évolution ecchymotique révélant un lupus érythémateux systémique de l’enfant avec anticorps anti-C1q. Ann Dermatol Venereol 2008; 135:584-6. [DOI: 10.1016/j.annder.2007.11.036] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2007] [Accepted: 11/23/2007] [Indexed: 11/25/2022]
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Isidor B, Corradini N, Poignant S, Picherot G, Thomas C, Méchinaud F, David A. SFP-18 – Métabolisme – Hypercalprotectinémie-hyperzincémie : un nouveau syndrome autoinflammatoire héréditaire. Arch Pediatr 2008. [DOI: 10.1016/s0929-693x(08)72085-2] [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: 10/21/2022]
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Kuster A, Picherot G, Liet JM, Hazart I, Poignant S. Nouvelles intoxications de l'enfant. Arch Pediatr 2004; 11:689-91. [PMID: 15158882 DOI: 10.1016/j.arcped.2004.03.091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Affiliation(s)
- A Kuster
- Clinique médicale, urgence et réanimation pédiatriques, hôpital Mère-Enfant, CHU, 44093 Nantes, France
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Tellier C, Vallet-Strouve C, Akoka S, Poignant S. Interactions between biliary lipid micelles and intestinal brush border membranes investigated by 1H and 31P nuclear magnetic resonance. Eur Biophys J 1987; 15:177-84. [PMID: 3443080 DOI: 10.1007/bf00263682] [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] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The effect of taurocholate and lecithin-cholesterol-taurocholate mixed micelles on the structure of isolated intestinal brush border membranes was investigated by nuclear magnetic resonance (NMR). Rabbit brush border membranes isolated by a Mg2+ precipitation step were chosen for this study because of their stability and integrity as revealed by 31P NMR. Incubation of taurocholate with the brush border membranes does not induce significant solubilization of these membranes even when the taurocholate/phospholipid ratio reaches 3.0. 1H NMR studies indicate that taurocholate is included in the membrane bilayer at low concentration (3 mM). However this biliary salt produces a size diminution of the vesicles when its concentration increases. Incorporation of lecithin or lecithin-cholesterol in micelles of taurocholate and subsequent incubation with brush border membranes lead simultaneously to a decrease in the 31P NMR isotropic/bilayer line ratio, and to an increase in delta sigma. These results indicate a protective effect of these compounds against lytic damage of taurocholate. Furthermore the equilibrium distribution of lecithin between mixed micelles and the membrane bilayer is strongly in favour of complete integration of micellar components in the bilayer. These data suggest that uptake of lipids from the micellar phase by isolated brush border membranes involves an interaction of the micelles with membranes followed by a fusion process.
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Affiliation(s)
- C Tellier
- Centre de Recherche en Biologie et Physico-Chimie Cellulaires, Faculté des Sciences, Université de Nantes, France
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Akoka S, Tellier C, Poignant S. Molecular order, dynamics, and ionization state of phosphatidylethanolamine bilayers as studied by 15N NMR. Biochemistry 1986; 25:6972-7. [PMID: 3801405 DOI: 10.1021/bi00370a035] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Dipalmitoylphosphatidylethanolamine (DPPE) and dipalmitoylphosphatidylcholine (DPPC), 15N-labeled in the polar head group, were synthesized. The proton-decoupled 15N spectra of DPPC and DPPE in aqueous dispersion have exactly the form anticipated for powder line shapes governed by an axially symmetric shielding tensor. The chemical shift anisotropy (delta sigma) of DPPC is lower than 0.4 ppm at 30 degrees C and vanished when the temperature or the half-height line width is increased; DPPE always exhibits an asymmetric line shape, and 15N NMR spectra of DPPE are obtained at various temperatures and simulated to measure exactly the chemical shift anisotropy. At each temperature, the order parameter of the C-N bond segment is derivated from delta sigma and reveals that the average orientation of the C-N bond around the axis of rotation is near the "magic angle" (54.7 degrees). Isotropic correlation times are derived from T1, which are higher than values obtained for phosphatidylcholine by other nuclei. Arrhenius plots of T1 and T2 allowed us to calculate the activation energy for the motion of the DPPE and the DPPC C-N bond. The value of this activation energy for the DPPE (53 kJ/mol) is higher than the one found for the DPPC C-N bond (32 kJ/mol). These differences agree with the capacity of the ethanolamine head groups to bind noncovalently to their neighbors in the plane of the membrane surface. A direct titration curve of the amino group is achieved by the variation of the chemical shift with the bulk pH, and the interfacial pKa is calculated to be 11.1.(ABSTRACT TRUNCATED AT 250 WORDS)
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Vallet-Strouve C, Tellier C, Poignant S, Boucrot P. Effect of micellar lipids on rabbit intestinal brush-border membrane phospholipid bilayer integrity studied by 31P NMR. J Membr Biol 1985; 84:73-9. [PMID: 3999126 DOI: 10.1007/bf01871649] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The effect of biliary salts and fatty acids on the bilayer structure of rabbit intestinal brush-border membranes was studied using the nonperturbing probe 31P NMR. The broad, asymmetric lineshape of the 31P NMR spectrum of isolated brush-border vesicles demonstrates that their component phospholipids are organized in extended bilayers. These membranes are not significantly perturbed by incubation with physiological concentrations of biliary salts (3, 9, 18 mM), demonstrating that the vesicles are highly stable, corresponding to their biological function. However, the emergence of a narrow peak superimposed on the broad lineshape indicates that a small proportion of the membrane phospholipids has reached isotropic motion, which may correspond to external or internal micellar structures. Incubation with mixed micelles of fatty acids and taurochlorate show that long-chain fatty acids enhance the membrane-perturbing effect of taurocholate while short-chain, water-soluble fatty acids do not, suggesting a difference in the absorption mechanisms.
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Maugras M, Poignant S, Bischoff P, Oth D. [Visualization of different types of hapten-cell membrane interaction by fluorine high-field nuclear magnetic resonance]. Biol Cell 1984; 49:91-3. [PMID: 6199063 DOI: 10.1111/j.1768-322x.1984.tb00226.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Using a high field spectrometer (5.9 Tesla) 19F-NMR spectrum of soluble material from 4 trifluoromethyl 2,6 dinitrobenzene sulphonate (CF3-DNBS) treated murine lymphocytes was recorded. CF3-DNBS is a fluorinated analog of 2,4,6 trinitrobenzene sulphonate (TNBS), and these compounds have been found to create cross-reacting antigenic modifications of cell surface. At least 4 distinguishable signals have been detected, and we think that 19F-NMR could be used to study, at a molecular level, some immunochemical problems concerning modification with TNBS.
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Bischoff P, Maugras M, Poignant S, Oth D. Cell surface modifications with trifluoromethyl dinitrophenyl-soluble protein conjugates: immunogenic role of noncovalently bound hapten. Int Arch Allergy Appl Immunol 1984; 75:20-6. [PMID: 6611313 DOI: 10.1159/000233584] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Bovine serum albumin (BSA) was derivatized, under mild conditions, with trifluoromethyl-dinitrophenyl (CF3-DNP), a haptenic group cross-reacting with trinitrophenyl (TNP). High-field nuclear magnetic resonance of fluorine (19F-NMR) permitted to calculate the number of covalently and noncovalently bound haptenic groups per BSA molecule. Further dialysis against paratoluene sulfonic acid permitted to obtain CF3-DNP-BSA conjugates from which noncovalently bound hapten had been removed. Soluble conjugates containing 4 covalently bound plus 1 noncovalently bound hapten groups, or only 4 covalently bound groups, were added to splenocytes in culture. These splenocytes, after such treatments, were added to effector lymphocytes in a 5-day culture aimed at the generation of cytotoxic T lymphocytes (CTL) against the CF3-DNP-induced cell surface modification antigens. It was found that only the BSA conjugates that contained noncovalently bound haptens were able to generate CTL against target cells whose surface had been directly modified with CF3-DNP, whereas BSA bearing only covalently bound hapten groups were not. Replacing BSA by human serum albumin, or CF3-DNP by TNP, gave comparable results. Thus, under the conditions used, haptenic groups covalently bound to their soluble carrier protein did not generate hapten-dependent CTL, but noncovalently bound or free haptenic groups at very low concentration were able to do so.
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Tellier C, Curtet C, Poignant S, Godard A, Aubry J. Proton NMR study of the binding of concanavalin A on myeloma plasma membranes. Biochem Biophys Res Commun 1982; 104:113-20. [PMID: 7073662 DOI: 10.1016/0006-291x(82)91947-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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Maugras M, Oth D, Bischoff P, Rubini P, Poignant S, Mehrishi J. Covalent and non-covalent binding of nitrobenzene sulphonates to cell surface membranes. Biochem Biophys Res Commun 1981; 100:1477-83. [PMID: 7295312 DOI: 10.1016/0006-291x(81)90685-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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Poignant S, Gauvreau JR, Martin GJ. Etude par resonance magnétique multinucléaire d'intermédiaires réactionnels électrophiles. Partie 8. Action des acides de Lewis chlorés COCl2, POCl3, (CH3)2N=CHCl+Cl− et Cl2 sur l'hexaméthylphosphotriamide (HMPT). CAN J CHEM 1980. [DOI: 10.1139/v80-150] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The structural study of the electrophilic intermediates obtained from carboxamides and chlorinated Lewis acids is extended to the phosphoric amides. The action of COCl2 and POCl3 on hexamethylphosphotriamide (HMPT) can lead to a chlorophosphonium salt (3a) the structure of which is proved by nmr spectroscopy (1H, 13C, 31P, 15N). The mechanism of formation is comparable to that of the chloroiminium chloride (Vilsmeier reagent) from the corresponding amides. The action of chlorine on HMPT does not lead to a stable salt of the same kind but essentially to the substitution product (2). A new biphosphorylated compound (6) has been identified when an excess of chlorine is reacted with HMPT.
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Guidoin R, Domurado D, Poignant S, Gosselin C, Awad J. Stored blood microfiltration. Evaluation of micro-aggregate filter composed of polyurethane foam and nylon wool. Res Exp Med (Berl) 1977; 171:129-39. [PMID: 928974 DOI: 10.1007/bf01851360] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Aggregates of amorphous material which develop during storage of banked blood have been implicated as a cause of pulmonary micro-embolism in man following massive transfusion. Such pulmonary micro-embolism may be a causal factor in the development of post traumatic pulmonary insufficiency. At present several microaggregate filters for use in massive transfusion are commercially available, and on of these is the Fenwal filter. It is composed of a screen filter which removes microclots of 250 microns and higher, a layer of polyurethane foam and a layer of nylon wool. The resistance of this device is very acceptable and the filter may be used for several blood units, but its efficiency seems less than that of Dacron wool filter.
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