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Collignon C, Benaboud S, Gana I, Bendavid M, Fournier B, Oualha M, de Marcellus C. Pharmacokinetic of ceftazidime-avibactam in a critically ill patient under high-volume continuous venovenous haemodiafiltration: A first paediatric case report. Br J Clin Pharmacol 2024; 90:890-894. [PMID: 38178624 DOI: 10.1111/bcp.15993] [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: 09/13/2023] [Revised: 12/01/2023] [Accepted: 12/16/2023] [Indexed: 01/06/2024] Open
Abstract
Ceftazidime-avibactam is a novel cephalosporin/B-lactamase inhibitor developed in the context of increasing resistance. This case reports the pharmacokinetics of ceftazidime-avibactam in a critically ill child under continuous renal replacement (CRRT) therapy for fluid overload. The patient was a 6-month-old female with sepsis due to bloodstream infection to Stenotrophomonas maltophilia following stem cell transplantation for severe combined immunodeficiency. CRRT was started on Day 2. Concentrations have been monitored using liquid chromatography-tandem mass spectrometry. Treatment was given every 8 h with a 2 h infusion of 30-7,5 mg/kg and did not reach pharmacokinetic/pharmacodynamic targets. Total clearance was respectively 1.7 and 3.02 L/h, with CRRT clearance respectively 28.8%-60% for ceftazidime and 14%-33% for avibactam. Those clearances are higher than reported in adult literature leading to a risk of treatment failure and emerging resistance. This supports the benefit of monitoring antimicrobial therapy under CRRT and the necessity to assess higher dosing or continuous infusion of ceftazidime-avibactam.
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Affiliation(s)
- Charlotte Collignon
- Pediatric Intensive Care Unit, APHP University Hospital Necker-Enfants Malades, Paris, France
| | - Sihem Benaboud
- Pharmacology and Drug Evaluation in Children and Pregnant Women EA7323, Department of Clinical Pharmacology, Cochin Hospital, Paris Descartes University, Paris Descartes University, Paris, France
| | - Inès Gana
- Pharmacology and Drug Evaluation in Children and Pregnant Women EA7323, Department of Clinical Pharmacology, Cochin Hospital, Paris Descartes University, Paris Descartes University, Paris, France
| | - Matthieu Bendavid
- Pediatric Intensive Care Unit, APHP University Hospital Necker-Enfants Malades, Paris, France
| | - Benjamin Fournier
- Pediatric Hematology-Immunology and Rheumatology Unit, Necker Children's Hospital, Assistance Publique-Hôpitaux de Paris, Paris, France
| | - Mehdi Oualha
- Pediatric Intensive Care Unit, APHP University Hospital Necker-Enfants Malades, Paris, France
- Université de Paris, Paris, France
| | - Charles de Marcellus
- Pediatric Intensive Care Unit, APHP University Hospital Necker-Enfants Malades, Paris, France
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Khirani S, Dosso M, Fresnel E, Collignon C, Vedrenne-Cloquet M, Griffon L, Fauroux B. Detection of pediatric breathing by CPAP/NIV devices: Clinical experience. Pediatr Pulmonol 2024; 59:510-513. [PMID: 37933796 DOI: 10.1002/ppul.26751] [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] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/04/2023] [Revised: 10/16/2023] [Accepted: 10/29/2023] [Indexed: 11/08/2023]
Affiliation(s)
- Sonia Khirani
- ASV Santé, Gennevilliers, France
- Pediatric Noninvasive Ventilation and Sleep Unit, AP-HP Necker Hospital, Paris, France
| | - Marine Dosso
- Pediatric Noninvasive Ventilation and Sleep Unit, AP-HP Necker Hospital, Paris, France
| | | | | | | | - Lucie Griffon
- Pediatric Noninvasive Ventilation and Sleep Unit, AP-HP Necker Hospital, Paris, France
- VIFASOM, Université Paris Cité, Paris, France
| | - Brigitte Fauroux
- Pediatric Noninvasive Ventilation and Sleep Unit, AP-HP Necker Hospital, Paris, France
- VIFASOM, Université Paris Cité, Paris, France
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Khirani S, Dosso M, Gerin L, Basa M, Collignon C, Vedrenne-Cloquet M, Griffon L, Fauroux B. Why breath-by-breath built-in software data should be used to monitor CPAP/NIV in children? Pediatr Pulmonol 2024; 59:506-509. [PMID: 37921567 DOI: 10.1002/ppul.26740] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/05/2023] [Accepted: 10/17/2023] [Indexed: 11/04/2023]
Affiliation(s)
- Sonia Khirani
- ASV Santé, Gennevilliers, France
- Pediatric Sleep and Noninvasive Ventilation Unit, AP-HP Necker Hospital, Paris, France
| | - Marine Dosso
- Pediatric Sleep and Noninvasive Ventilation Unit, AP-HP Necker Hospital, Paris, France
| | - Lorène Gerin
- Pediatric Sleep and Noninvasive Ventilation Unit, AP-HP Necker Hospital, Paris, France
| | - Mihail Basa
- Department of Pulmonology, Mother and Child Health Care Institute of Serbia, Belgrade, Serbia
| | - Charlotte Collignon
- Department of Pediatric Intensive Care, AP-HP Necker Hospital, Paris, France
| | | | - Lucie Griffon
- Pediatric Sleep and Noninvasive Ventilation Unit, AP-HP Necker Hospital, Paris, France
- Université Paris Cité, VIFASOM, Paris, France
| | - Brigitte Fauroux
- Pediatric Sleep and Noninvasive Ventilation Unit, AP-HP Necker Hospital, Paris, France
- Université Paris Cité, VIFASOM, Paris, France
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Vedrenne-Cloquet M, Tuffet S, Louis B, Khirani S, Collignon C, Renolleau S, Fauroux B, Carteaux G. Accuracy of tidal volume delivery by paediatric intensive care ventilators: A bench-model study. Aust Crit Care 2024:S1036-7314(24)00005-5. [PMID: 38267269 DOI: 10.1016/j.aucc.2023.12.007] [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: 08/12/2023] [Revised: 11/06/2023] [Accepted: 12/02/2023] [Indexed: 01/26/2024] Open
Abstract
BACKGROUND Tidal volume (Vt) delivery during mechanical ventilation is influenced by gas compression, humidity, and temperature. OBJECTIVES This bench study aimed at assessing the accuracy of Vt delivery by paediatric intensive care ventilators according to the humidification system. Secondary objectives were to assess the following: (i) the accuracy of Vt delivery in ventilators with an integrated Y-piece pneumotachograph and (ii) the ability of ventilators to deliver and maintain a preset positive end-expiratory pressure. METHODS Six latest-generation intensive care ventilators equipped with a paediatric mode were tested on the ASL5000 test lung in four simulated paediatric bench models (full-term neonate, infant, preschool-age chile, and school-age child), under volume-controlled mode with a heated humidifier (HH) or a heat moisture exchanger, with various loading conditions. Three ventilators equipped with a Y-piece pneumotachograph were tested with or without the pneumotachograph in the neonatal and infant models. "Accurate Vt" delivery was defined as a volume error (percentage of the preset Vt under body temperature and pressure and saturated water vapour conditions) being ≤10 % of the absolute preset value. RESULTS Vt accuracy varied significantly across ventilators but was acceptable in almost all the ventilators and all the models, except the neonatal model. The humidification system had an impact on Vt delivery in the majority of the tested conditions (p < 0.05). The use of an HH was associated with a better Vt accuracy in four ventilators (V500, V800, R860, and ServoU) and allowed to achieve an acceptable level of volume error in the neonatal model as compared to the use of heat moisture exchanger. The use of an integrated pneumotachograph was associated with lower volume error in only one ventilator (p < 0.01). All the tested ventilators were able to maintain adequate positive end-expiratory pressure levels. CONCLUSION The humidification system affects Vt accuracy of paediatric intensive care ventilators, especially in the youngest patients for whom the HH should be preferred.
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Affiliation(s)
- Meryl Vedrenne-Cloquet
- Pediatric Sleep and Noninvasive Ventilation Unit, EA 7330 VIFASOM, AP-HP, Hôpital Necker Enfants-Malades, Paris, France; Université de Paris, Paris, France; Réanimation Médicochirurgicale Pédiatrique, AP-HP, CHU Necker-Enfants Malades, Paris, France.
| | - Samuel Tuffet
- INSERM, Université Paris Est Créteil IMRB, CNRS EMR, 7000, Créteil, France; GRC CARMAS, IMRB, Université Paris Est Créteil, Faculté de Santé de Créteil, Créteil, France; Réanimation Médicale, AP-HP, Centre Hospitalier Universitaire Henri Mondor, Créteil, France
| | - Bruno Louis
- INSERM, Université Paris Est Créteil IMRB, CNRS EMR, 7000, Créteil, France
| | - Sonia Khirani
- Pediatric Sleep and Noninvasive Ventilation Unit, EA 7330 VIFASOM, AP-HP, Hôpital Necker Enfants-Malades, Paris, France; Université de Paris, Paris, France; ASV Santé, Gennevilliers, France
| | - Charlotte Collignon
- Réanimation Médicochirurgicale Pédiatrique, AP-HP, CHU Necker-Enfants Malades, Paris, France
| | - Sylvain Renolleau
- Université de Paris, Paris, France; Réanimation Médicochirurgicale Pédiatrique, AP-HP, CHU Necker-Enfants Malades, Paris, France
| | - Brigitte Fauroux
- Pediatric Sleep and Noninvasive Ventilation Unit, EA 7330 VIFASOM, AP-HP, Hôpital Necker Enfants-Malades, Paris, France; Université de Paris, Paris, France
| | - Guillaume Carteaux
- INSERM, Université Paris Est Créteil IMRB, CNRS EMR, 7000, Créteil, France; GRC CARMAS, IMRB, Université Paris Est Créteil, Faculté de Santé de Créteil, Créteil, France; Réanimation Médicale, AP-HP, Centre Hospitalier Universitaire Henri Mondor, Créteil, France
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Collignon C, de Marcellus C, Oualha M, Neuranter V, Heilbronner C, Hirt D. Pharmacokinetic profile of acyclovir in a child receiving continuous kidney replacement therapy for acute liver failure. Pediatr Nephrol 2023; 38:3493-3497. [PMID: 36702934 PMCID: PMC9880359 DOI: 10.1007/s00467-023-05881-6] [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] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/17/2022] [Revised: 01/07/2023] [Accepted: 01/09/2023] [Indexed: 01/28/2023]
Abstract
BACKGROUND Continuous venovenous hemodiafiltration (CVVHDF) is one of the treatments of critically ill children presenting severe acute liver failure. This affliction might be induced by HSV infection requiring a treatment by acyclovir. Continuous kidney replacement therapy (CKRT) can alter its pharmacokinetics, according to its physicochemical properties and CVVHDF settings. CASE-DIAGNOSIS/TREATMENT The patient was a 21-month-old female presenting liver failure with hyperammonemia treated by acyclovir with presumed HSV infection. CKRT was initiated on day 1 with substantial replacement and dialysate flow rates (respectively 75 and 220 mL/kg/h). Acyclovir was intravenously administered every 8 h with a 1-h infusion of 500 mg/m2. Plasma and effluent concentrations were measured by liquid chromatography-tandem mass spectrometry assay to estimate the area under a curve (AUC) and CKRT clearance by 2 methods (one based on pre- and post-filter concentrations and the other one on dialysate flow rates). Clearance was estimated between 19.2 and 26.3 mL/min with the first method and between 27.6 and 44.3 mL/min with the second one. Concentrations were highly above the therapeutic index (peak concentration was measured at 28 mg/L), but AUC was appropriate. CONCLUSIONS This case describes acyclovir pharmacokinetics during CKRT in a pediatric patient treated by acyclovir. The patient was treated with adapted exposure with the usual dosing, but lower dosing should be investigated with complementary studies. TRIAL REGISTRATION ClinicalTrials.gov NCT02539407.
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Affiliation(s)
- Charlotte Collignon
- Pediatric Intensive Care Unit, APHP University Hospital Necker-Enfants Malades, 149 Rue de Sèvres, 75015, Paris, France.
| | - Charles de Marcellus
- Pediatric Intensive Care Unit, APHP University Hospital Necker-Enfants Malades, 149 Rue de Sèvres, 75015, Paris, France
| | - Mehdi Oualha
- Pediatric Intensive Care Unit, APHP University Hospital Necker-Enfants Malades, 149 Rue de Sèvres, 75015, Paris, France
- Université de Paris, Paris, France
| | - Valentin Neuranter
- Pharmacology and Drug Evaluation in Children and Pregnant Women EA7323, Paris Descartes University, Paris, France
- Department of Clinical Pharmacology, Cochin Hospital, Paris, France
| | - Claire Heilbronner
- Pediatric Intensive Care Unit, APHP University Hospital Necker-Enfants Malades, 149 Rue de Sèvres, 75015, Paris, France
| | - Déborah Hirt
- Université de Paris, Paris, France
- Pharmacology and Drug Evaluation in Children and Pregnant Women EA7323, Paris Descartes University, Paris, France
- Department of Clinical Pharmacology, Cochin Hospital, Paris, France
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Cardoen L, Nicolas N, Le Gaudu V, Gauthier A, Carton M, Berrebi D, Cyrta J, Collignon C, Cordero C, Pierron G, Pannier S, Philippe-Chomette P, Orbach D, Brisse HJ. Fat-Containing Soft Tissue Tumors in Children, Adolescents, and Young Adults: Which Require Biopsy? Cancers (Basel) 2023; 15:3228. [PMID: 37370837 DOI: 10.3390/cancers15123228] [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: 06/02/2023] [Revised: 06/14/2023] [Accepted: 06/15/2023] [Indexed: 06/29/2023] Open
Abstract
PURPOSE To confirm the overall benignity of fat-containing soft tissue tumors (STT) on a pediatric cohort and to define the clinical and imaging features that warrant a biopsy. METHODS A retrospective monocentric study was conducted on patients aged less than 25 years consecutively referred for fat-containing STT to our Comprehensive Cancer Center between 1998 and 2022. Tumor imaging characteristics at diagnosis (US, CT, or MRI) were correlated with pathology. RESULTS The database extraction identified 63 fat-containing tumors with clinical, histologic, and imaging data available for review. In total, 58 (92%) were benign tumors: 36 lipoblastomas and lipomas, 12 fibrous hamartomas of infancy (FHI), 5 lipofibromatosis, 2 lipomas arborescens, 2 lipomatosis and 1 spindle-cell lipoma. Five patients (8%) were diagnosed with liposarcoma. Factors significantly correlated with malignancy were age >10 years old (p < 0.001), having a cancer-predisposing condition (p < 0.001), a percentage of fat <25% (p = 0.002), and a presence of myxoid zones (p < 0.001) on imaging. CONCLUSION Most fat-containing STT in children may be classified as benign tumors based on clinics and imaging. The indication for biopsy could be limited to patients aged 10 years or more with either a cancer-predisposing condition or imaging features demonstrating either a low-fat component (<25%) or the presence of myxoid zones.
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Affiliation(s)
| | - Nayla Nicolas
- Department of Imaging, Institut Curie, 75005 Paris, France
| | | | - Arnaud Gauthier
- Department of Pathology, Institut Curie, 75005 Paris, France
| | - Matthieu Carton
- Department of Biostatistics, Institut Curie, 75005 Paris, France
| | - Dominique Berrebi
- Department of Pathology, Assistance Publique des Hôpitaux de Paris, Hôpital Necker Enfants Malades, 75015 Paris, France
| | - Joanna Cyrta
- Department of Pathology, Institut Curie, 75005 Paris, France
| | - Charlotte Collignon
- SIREDO Oncology Center (Care, Innovation and Research for Children and AYA with Cancer), Institut Curie, PSL University, 75005 Paris, France
| | - Camille Cordero
- SIREDO Oncology Center (Care, Innovation and Research for Children and AYA with Cancer), Institut Curie, PSL University, 75005 Paris, France
| | - Gaëlle Pierron
- Department of Somatic Genetics, Institut Curie, 75005 Paris, France
| | - Stéphanie Pannier
- Paediatric Orthopaedic Service, Assistance Publique des Hôpitaux de Paris, Université Paris Cité, Hôpital Necker, 75015 Paris, France
| | - Pascale Philippe-Chomette
- Department of Pediatric Surgery, Assistance Publique des Hôpitaux de Paris, Hôpital Robert Debré, 75019 Paris, France
| | - Daniel Orbach
- SIREDO Oncology Center (Care, Innovation and Research for Children and AYA with Cancer), Institut Curie, PSL University, 75005 Paris, France
| | - Hervé J Brisse
- Department of Imaging, Institut Curie, 75005 Paris, France
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Khirani S, Dosso M, Collignon C, Tommesani C, Vedrenne-Cloquet M, Griffon L, Fauroux B. Why home NIV devices should have a Ti min/Ti max? Pediatr Pulmonol 2023. [PMID: 37204233 DOI: 10.1002/ppul.26492] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Revised: 05/02/2023] [Accepted: 05/09/2023] [Indexed: 05/20/2023]
Affiliation(s)
- Sonia Khirani
- ASV Santé, Gennevilliers, France
- Pediatric Sleep and Noninvasive Ventilation Unit, AP-HP Necker Hospital, Paris, France
| | - Marine Dosso
- Pediatric Sleep and Noninvasive Ventilation Unit, AP-HP Necker Hospital, Paris, France
| | | | - Chiara Tommesani
- Pediatric Sleep and Noninvasive Ventilation Unit, AP-HP Necker Hospital, Paris, France
- University Milano-Bicocca, Milan, Italy
- Pediatric Unit, Fondazione IRCCS San Gerardo dei Tintori, Monza, Italy
| | | | - Lucie Griffon
- Pediatric Sleep and Noninvasive Ventilation Unit, AP-HP Necker Hospital, Paris, France
- Université Paris Cité, VIFASOM, Paris, France
| | - Brigitte Fauroux
- Pediatric Sleep and Noninvasive Ventilation Unit, AP-HP Necker Hospital, Paris, France
- Université Paris Cité, VIFASOM, Paris, France
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Vedrenne-Cloquet M, Khirani S, Griffon L, Collignon C, Renolleau S, Fauroux B. Respiratory effort during noninvasive positive pressure ventilation and continuous positive airway pressure in severe acute viral bronchiolitis. Pediatr Pulmonol 2023. [PMID: 37097049 DOI: 10.1002/ppul.26424] [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] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/01/2022] [Revised: 03/22/2023] [Accepted: 03/31/2023] [Indexed: 04/26/2023]
Abstract
OBJECTIVES To assess if noninvasive positive pressure ventilation (NIPPV) is associated with a greater reduction in respiratory effort as compared to continuous positive airway pressure (CPAP) during severe acute bronchiolitis, with both supports set either clinically or physiologically. METHODS Twenty infants (median [IQR] age 1.2 [0.9; 3.2] months) treated <24 h with noninvasive respiratory support (CPAP Clin, set at 7 cmH2 O, or NIPPV Clin) for bronchiolitis were included in a prospective single-center crossover study. Esogastric pressures were measured first with the baseline support, then with the other support. For each support, recordings were performed with the clinical setting and a physiological setting (CPAP Phys and NIPPV Phys), aiming at normalising respiratory effort. Patients were then treated with the optimal support. The primary outcome was the greatest reduction in esophageal pressure-time product (PTPES /min). Other outcomes included improvement of the other components of the respiratory effort. RESULTS NIPPV Clin and Phys were associated with a lower PTPES /min (164 [105; 202] and 106 [78; 161] cmH2 O s/min, respectively) than CPAP Clin (178 [145; 236] cmH2 O s/min; p = 0.01 and 2 × 10-4 , respectively). NIPPV Clin and Phys were also associated with a significant reduction of all other markers of respiratory effort as compared to CPAP Clin. PTPES /min with NIPPV (Clin or Phys) was not different from PTPES /min with CPAP Phys. There was no significant difference between physiological and clinical settings. CONCLUSION NIPPV is associated with a significant reduction in respiratory effort as compared to CPAP set at +7 cmH2 O in infants with severe acute bronchiolitis. CPAP Phys performs as well as NIPPV Clin.
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Affiliation(s)
- Meryl Vedrenne-Cloquet
- Pediatric Noninvasive Ventilation and Sleep Unit, AP-HP, Hôpital Necker Enfants-Malades, Paris, France
- Université de Paris, EA, 7330 VIFASOM, Paris, France
- Pediatric Intensive Care Unit, AP-HP, CHU Necker-Enfants Malades, Paris, France
| | - Sonia Khirani
- Pediatric Noninvasive Ventilation and Sleep Unit, AP-HP, Hôpital Necker Enfants-Malades, Paris, France
- Université de Paris, EA, 7330 VIFASOM, Paris, France
- ASV Santé, Gennevilliers, France
| | - Lucie Griffon
- Pediatric Noninvasive Ventilation and Sleep Unit, AP-HP, Hôpital Necker Enfants-Malades, Paris, France
- Université de Paris, EA, 7330 VIFASOM, Paris, France
| | - Charlotte Collignon
- Pediatric Intensive Care Unit, AP-HP, CHU Necker-Enfants Malades, Paris, France
| | - Sylvain Renolleau
- Université de Paris, EA, 7330 VIFASOM, Paris, France
- Pediatric Intensive Care Unit, AP-HP, CHU Necker-Enfants Malades, Paris, France
| | - Brigitte Fauroux
- Pediatric Noninvasive Ventilation and Sleep Unit, AP-HP, Hôpital Necker Enfants-Malades, Paris, France
- Université de Paris, EA, 7330 VIFASOM, Paris, France
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Collignon C, Domenech C, Ducassou S, Pluchart C, Bruno B, Pasquet M, Simon P, Petit A, Rialland-Battisti F, Brethon B. Temporary contraindication to chemotherapy due to toxicity: blinatumomab's effectiveness in paediatric patients with B‐acute lymphoblastic leukaemia. Br J Haematol 2023; 201:e42-e45. [PMID: 36971071 DOI: 10.1111/bjh.18759] [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] [Received: 01/17/2023] [Revised: 03/06/2023] [Accepted: 03/07/2023] [Indexed: 03/29/2023]
Affiliation(s)
- C Collignon
- Pediatric Intensive Care Unit, APHP University Hospital Necker-Enfants Malades, Paris, France
| | - C Domenech
- Institute of Pediatric Hematology and Oncology, Hospices Civils de Lyon, Université Lyon 1, Lyon, France
| | - S Ducassou
- Pediatrics Oncology Department, Children's Hospital of Bordeaux University Hospital, Bordeaux, France
| | - C Pluchart
- Pediatric Hematology-Oncology Unit, CHU Reims, Reims, France
| | - B Bruno
- Pediatric Hematology Unit, CHU Lille, Lille, France
| | - M Pasquet
- Pediatric Hematology-Oncology Unit, CHU Toulouse, Toulouse, France
| | - P Simon
- Pediatric Hematology-Oncology Unit, CHU Besançon, Besançon, France
| | - A Petit
- Sorbonne Université, Hôpital Armand Trousseau, AP-HP, Paris, France
| | | | - B Brethon
- Hematology and Immunology Pediatric Unit, Robert Debré Hospital, Paris, France
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El Hajj R, Stanzelova A, de Marcellus C, Kossorotoff M, Remangeon F, Roux CJ, Touzé R, Toubiana J, Benaboud S, Oualha M, Moulin F, Collignon C. Severe atypical Lemierre syndrome caused by methicillin-sensitive Staphylococcus aureus: Two pediatric case reports. Arch Pediatr 2023:S0929-693X(23)00037-4. [PMID: 36990936 DOI: 10.1016/j.arcped.2023.02.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2022] [Accepted: 02/12/2023] [Indexed: 03/29/2023]
Abstract
BACKGROUND Lemierre syndrome is typically associated with ear, nose, and throat (ENT) infections caused by Fusobacterium necrophorum. Since 2002, cases of atypical Lemierre-like syndrome secondary to Staphylococcus aureus have been reported. CASES We report two pediatric cases of atypical Lemierre syndrome with a similar presentation: exophthalmia, absence of pharyngitis, metastatic lung infection, and intracranial venous sinus thrombosis. Both patients had a favorable outcome following treatment with antibiotics, anticoagulation, and corticosteroids. CONCLUSION Regular therapeutic monitoring of antibiotic levels helped to optimize antimicrobial treatment in both cases.
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Affiliation(s)
- R El Hajj
- Pediatrics, André Mignot Hospital, Versailles, France
| | - A Stanzelova
- Department of General Pediatrics and Pediatric Infectious Diseases, Necker-Enfants Malades University Hospital, Paris, France; Université de Paris Cité, Paris, France
| | - C de Marcellus
- Pediatric Intensive Care Unit, APHP University Hospital Necker-Enfants Malades, Paris, France
| | - M Kossorotoff
- Pediatric Neurology, APHP University Hospital Necker-Enfants Malades, Paris, France
| | - F Remangeon
- Université de Paris Cité, Paris, France; Pediatric Otorhinolaryngology Department, APHP, Hôpital Universitaire Necker-Enfants Malades, Paris, France
| | - C-J Roux
- Pediatric Radiology, APHP University Hospital Necker-Enfants Malades, Paris, France
| | - R Touzé
- Ophthalmology Department and Reference Center for Rare Ophthalmological Diseases (OPHTARA), AP-HP, University Hospital Necker-Enfants Malades, Paris, France; Université de Paris Cité, Paris, France
| | - J Toubiana
- Department of General Pediatrics and Pediatric Infectious Diseases, Necker-Enfants Malades University Hospital, Paris, France; Université de Paris Cité, Paris, France
| | - S Benaboud
- Pharmacology Department, Cochin Hospital, AP-HP Centre-Université de Paris, Paris, France
| | - M Oualha
- Université de Paris Cité, Paris, France; Pediatric Intensive Care Unit, APHP University Hospital Necker-Enfants Malades, Paris, France
| | - F Moulin
- Pediatric Intensive Care Unit, APHP University Hospital Necker-Enfants Malades, Paris, France
| | - C Collignon
- Pediatric Intensive Care Unit, APHP University Hospital Necker-Enfants Malades, Paris, France.
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11
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Collignon C, Frachette C, Callot D, Pinhas Y, Bataille P, Bader-Meunier B, Chouchana L, Frémond ML, Belhadjer Z, Oualha M, Moulin F, Javouhey E, Belot A, Renolleau S. Two pediatric cases of multisystem inflammatory-like syndrome following COVID-19 vaccination. Arch Pediatr 2022; 29:620-623. [PMID: 36283888 PMCID: PMC9510064 DOI: 10.1016/j.arcped.2022.08.018] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2022] [Revised: 06/23/2022] [Accepted: 08/25/2022] [Indexed: 11/25/2022]
Abstract
Multisystem inflammatory syndrome in children (MIS-C) is a novel post-infectious disease occurring in the context of SARS-CoV2 infection. COVID-19 vaccines have been authorized since December 2020, and adverse events including myocarditis have been reported following vaccination. We describe the cases of two pediatric patients presenting with clinical and laboratory features suggestive of MIS-C a few days after receiving their first dose of the Pfizer BNT162b2 vaccine. The outcome was favorable for both patients (after corticosteroid and immunoglobulin administration for one patient). These cases suggest an association between the COVID-19 vaccine and the occurrence of MIS-C.
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Rossi M, Durrleman C, Hayat M, Roux CJ, Kossorotoff M, Gitiaux C, Mazuet C, Moulin F, Collignon C. Infant botulism: Report of a misleading case and important key messages. Arch Pediatr 2022; 29:395-397. [DOI: 10.1016/j.arcped.2022.05.012] [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] [Received: 12/30/2021] [Revised: 03/28/2022] [Accepted: 05/12/2022] [Indexed: 11/28/2022]
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Collignon C, Gana I, Benaboud S, Toubiana J, Castelle M, Oualha M, de Marcellus C. Pharmacokinetics of ceftolozane/tazobactam continuous infusion on renal replacement therapy: A pediatric case report. Therapie 2021; 77:616-620. [PMID: 34776252 DOI: 10.1016/j.therap.2021.10.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Revised: 09/27/2021] [Accepted: 10/14/2021] [Indexed: 11/27/2022]
Affiliation(s)
- Charlotte Collignon
- Pediatric Intensive Care Unit, APHP University Hospital Necker-Enfants Malades, 149, rue de Sèvres, 75015 Paris, France
| | - Ines Gana
- Pharmacology and Drug Evaluation in Children and Pregnant Women EA7323, 75014 Paris, France
| | - Sihem Benaboud
- Pharmacology and Drug Evaluation in Children and Pregnant Women EA7323, 75014 Paris, France; Descartes University, Department of Clinical Pharmacology, Cochin Hospital, Paris-Descartes University, 75015 Paris, France; Université de Paris, 75006 Paris, France
| | - Julie Toubiana
- Department of Infectious Diseases and Tropical Medicine, APHP University Hospital Necker-Enfants Malades, 75015 Paris, France
| | - Martin Castelle
- Pediatric Hematology-Immunology and Rheumatology Unit, APHP University Hospital Necker-enfants malades, Paris, France
| | - Mehdi Oualha
- Pediatric Intensive Care Unit, APHP University Hospital Necker-Enfants Malades, 149, rue de Sèvres, 75015 Paris, France; Université de Paris, 75006 Paris, France
| | - Charles de Marcellus
- Pediatric Intensive Care Unit, APHP University Hospital Necker-Enfants Malades, 149, rue de Sèvres, 75015 Paris, France; Université de Paris, 75006 Paris, France.
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Phinney IY, Bandurin DA, Collignon C, Dmitriev IA, Taniguchi T, Watanabe K, Jarillo-Herrero P. Strong Interminivalley Scattering in Twisted Bilayer Graphene Revealed by High-Temperature Magneto-Oscillations. Phys Rev Lett 2021; 127:056802. [PMID: 34397232 DOI: 10.1103/physrevlett.127.056802] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2021] [Accepted: 06/29/2021] [Indexed: 06/13/2023]
Abstract
Twisted bilayer graphene (TBG) provides an example of a system in which the interplay of interlayer interactions and superlattice structure impacts electron transport in a variety of nontrivial ways and gives rise to a plethora of interesting effects. Understanding the mechanisms of electron scattering in TBG has, however, proven challenging, raising many questions about the origins of resistivity in this system. Here we show that TBG exhibits high-temperature magneto-oscillations originating from the scattering of charge carriers between TBG minivalleys. The amplitude of these oscillations reveals that interminivalley scattering is strong, and its characteristic timescale is comparable to that of its intraminivalley counterpart. Furthermore, by exploring the temperature dependence of these oscillations, we estimate the electron-electron collision rate in TBG and find that it exceeds that of monolayer graphene. Our study demonstrates the consequences of the relatively small size of the superlattice Brillouin zone and Fermi velocity reduction on lateral transport in TBG.
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Affiliation(s)
- I Y Phinney
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - D A Bandurin
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - C Collignon
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - I A Dmitriev
- Physics Department, University of Regensburg, 93040, Regensburg, Germany
- Ioffe Institute, 194021 St. Petersburg, Russia
| | - T Taniguchi
- International Center for Materials Nanoarchitectonics, National Institute of Material Science, Tsukuba 305-0044, Japan
| | - K Watanabe
- Research Center for Functional Materials, National Institute of Material Science, Tsukuba 305-0044, Japan
| | - P Jarillo-Herrero
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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Collignon C, Brisse HJ, Lemelle L, Cardoen L, Gauthier A, Pierron G, Roussel A, Dumont B, Alimi A, Cordero C, Rouffiange L, Orbach D. [Diagnostic strategy in pediatrics soft tissue sarcomas]. Bull Cancer 2020; 107:963-971. [PMID: 32950242 DOI: 10.1016/j.bulcan.2020.06.008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [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: 02/22/2020] [Revised: 06/09/2020] [Accepted: 06/18/2020] [Indexed: 02/08/2023]
Abstract
Soft tissue sarcomas in children are rare tumor, representing around 6 to 7% of children cancer. They spread mostly sporadically (90%) and therefore are rarely associated to an underlying constitutional genetic disease (10%). About half of those sarcomas are rhabdomyosarcomas and the others are a very heterogenous histologic group with various bio-pathologies and prognosis. Clinical presentation is mainly a soft tissue lump often difficult to distinguish from more frequent benign causes (malformative, infectious, benign, or pseudotumor). Inappropriate initial diagnosis work-up has a strong impact on soft tissue sarcomas' prognosis. Adapted complementary investigations (first ultrasound and MRI) are important to compile arguments for a malign origin and to indicate a biopsy. However, predictive value of imaging exams still remains imperfect, and histological analysis by percutaneous image-guided biopsy and sometimes by surgical biopsy is often necessary. Authors realize an update on optimal diagnostic pathway including molecular tests in presence of a soft tissue mass in a child.
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Affiliation(s)
- Charlotte Collignon
- Institut Curie, centre intégré de soins et de recherche en oncologie de l'enfant, adolescent et jeune adulte (SIREDO), 26, rue d'Ulm, 75005 Paris, France.
| | - Hervé J Brisse
- Institut Curie, département d'imagerie, 26, rue d'Ulm, 75005 Paris, France
| | - Lauriane Lemelle
- Institut Curie, centre intégré de soins et de recherche en oncologie de l'enfant, adolescent et jeune adulte (SIREDO), 26, rue d'Ulm, 75005 Paris, France
| | - Liesbeth Cardoen
- Institut Curie, département d'imagerie, 26, rue d'Ulm, 75005 Paris, France
| | - Arnaud Gauthier
- Institut Curie, département de médecine diagnostique et théranaustique, 26, rue d'Ulm, 75005 Paris, France
| | - Gaëlle Pierron
- Institut Curie, unité de génétique somatique, 26, rue d'Ulm, 75005 Paris, France
| | - Aphaia Roussel
- Hôpital Robert-Debré, service d'immuno-hématologie, 48, boulevard Sérurier, 75019 Paris, France
| | - Benoit Dumont
- Institut Curie, centre intégré de soins et de recherche en oncologie de l'enfant, adolescent et jeune adulte (SIREDO), 26, rue d'Ulm, 75005 Paris, France
| | - Aurélia Alimi
- Institut Curie, centre intégré de soins et de recherche en oncologie de l'enfant, adolescent et jeune adulte (SIREDO), 26, rue d'Ulm, 75005 Paris, France
| | - Camille Cordero
- Institut Curie, centre intégré de soins et de recherche en oncologie de l'enfant, adolescent et jeune adulte (SIREDO), 26, rue d'Ulm, 75005 Paris, France
| | - Lucie Rouffiange
- Institut Curie, centre intégré de soins et de recherche en oncologie de l'enfant, adolescent et jeune adulte (SIREDO), 26, rue d'Ulm, 75005 Paris, France
| | - Daniel Orbach
- Institut Curie, centre intégré de soins et de recherche en oncologie de l'enfant, adolescent et jeune adulte (SIREDO), 26, rue d'Ulm, 75005 Paris, France
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Fraysse B, Thai Van H, Collignon C, Ruidavets B. The French Cochlear Implant Registry (EPIIC): Place and role of registries in post-registration studies of medical devices. Eur Ann Otorhinolaryngol Head Neck Dis 2020; 137 Suppl 1:S1-S3. [DOI: 10.1016/j.anorl.2020.07.008] [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: 10/23/2022]
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Collignon C, Carton M, Brisse HJ, Pannier S, Gauthier A, Sarnacki S, Tiléa B, Savignoni A, Helfre S, Philippe-Chomette P, Cardoen L, Boccara O, Pierron G, Orbach D. Soft tissue sarcoma in children, adolescents and young adults: Outcomes according to compliance with international initial care guidelines. Eur J Surg Oncol 2019; 46:1277-1286. [PMID: 31839437 DOI: 10.1016/j.ejso.2019.11.518] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [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: 08/27/2019] [Revised: 11/14/2019] [Accepted: 11/29/2019] [Indexed: 01/17/2023] Open
Abstract
BACKGROUND Outcomes for adults with soft tissue sarcoma are better when managed at referral centers. Care guidelines advise for 5 main criteria: 1-Imaging before biopsy; 2-Tumor biopsy before surgery; 3-Multidiscipinary team discussion (MTD) before biopsy; 4-Biopsy in "expert centers"; 5-Somatic molecular biology feasible. The aim is to describe and assess the prognostic impact of initial management of STS according to the type of referring centers and the number of optimal criteria. METHODS Monocentric retrospective analysis of the management of 127 youths (0-25 years) with localized STS treated from 2006 to 2015. RESULTS Median age at diagnosis was 9.6 years (range: 025). Overall, only 41% patients had 5/5, 28% 3-4, 31% ≤2. No adequate imaging was performed before surgery/biopsy for 18% patients, no biopsy before treatment for 29%. Patients referred by "expert centers" had higher compliance to guidelines (P = 0.025). Upfront surgery was performed in 59/127 patients. Immediate re-operation was inversely related to the number of criteria (0% when 5 criteria vs. 14% for 3-4, 46% if ≤ 2; P < 0.001). For malignant tumors, outcome was better when 5 criteria were reached: 5 year EFS 90.8% (81.4-100.0%) vs. 71.6 for (60.4-84.9%; ≤4 criteria; p = 0.033), OS 93.6% (85.5-100%) vs. 79.5% (68.9-91.8%; p = 0.11), and LRFFS 90.6% (81.0-100.0) vs. 73.1% (62.0-86.3%; p = 0.047). CONCLUSION Less than half of the youths with STS are initially managed according to international guidelines, highlighting the need for better information about optimal management. These results plead for immediate management in reference centers to reduce initial burden of therapy.
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Affiliation(s)
- C Collignon
- SIREDO Oncology Center Care, Innovation and Research for Children, Adolescents and Young Adults with Cancer Institut Curie, PSL University, Paris, France.
| | - M Carton
- Department of Biostatistics, Institut Curie, PSL University, Paris, France
| | - H J Brisse
- Imaging Department, Institut Curie, Paris, France
| | - S Pannier
- Department of Orthopedic Pediatric Surgery, Necker Enfants Malades Hospital, Paris, France; Paris Descartes University, Sorbonne Paris Cité, Paris, France
| | - A Gauthier
- Department of Pathology, Institut Curie, Paris, France
| | - S Sarnacki
- Department of Pediatric Surgery and Urology, Necker Enfants Malades Hospital, Paris, France; Paris Descartes University, Sorbonne Paris Cité, Paris, France
| | - B Tiléa
- Department of Radiology, Robert Debré́ Hospital, Paris, France
| | - A Savignoni
- Department of Biostatistics, Institut Curie, PSL University, Paris, France
| | - S Helfre
- Department of Radiotherapy, Institut Curie, Paris, France
| | | | - L Cardoen
- Imaging Department, Institut Curie, Paris, France
| | - O Boccara
- Department of Dermatology and Reference Center for Genodermatoses and Rare Skin Diseases (MAGEC), Université Paris Descartes, Sorbonne Paris Cité, Institut Imagine, Hôpital Universitaire Necker-Enfants Malades, France
| | - G Pierron
- Department of Somatic Genetics, Institut Curie, Paris, France
| | - D Orbach
- SIREDO Oncology Center Care, Innovation and Research for Children, Adolescents and Young Adults with Cancer Institut Curie, PSL University, Paris, France
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Neeland MR, Shi W, Collignon C, Meeusen ENT, Didierlaurent AM, de Veer MJ. The adjuvant system AS01 up-regulates neutrophil CD14 expression and neutrophil-associated antigen transport in the local lymphatic network. Clin Exp Immunol 2018; 192:46-53. [PMID: 29194575 DOI: 10.1111/cei.13088] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [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: 08/31/2017] [Revised: 10/27/2017] [Accepted: 11/13/2017] [Indexed: 12/14/2022] Open
Abstract
The liposome-based adjuvant system AS01 is under evaluation for use in several vaccines in clinical development. We have shown previously that AS01 injected with hepatitis B surface antigen (HBsAg) induces a distinct cellular signature within the draining lymphatics that enhances local lymphocyte recruitment and antigen-specific humoral immunity. Here, we show that AS01-induced neutrophil recruitment is associated with increased expression of CD14 and enhanced antigen uptake capacity in neutrophils from both afferent and efferent lymphatic compartments during the first 48 h after vaccination. Significant and transient increases in CD14 expression on systemic neutrophils were also observed following primary and boost vaccination with HBsAg-AS01; however, they were not observed following additional encounter with HBsAg-alone or HBsAg-alum. These results show that following immunization with AS01, neutrophils expressing higher levels of CD14 are both more abundant and efficient at antigen uptake, warranting further investigation into the role of neutrophil-associated CD14 in the adjuvanticity of AS01.
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Affiliation(s)
- M R Neeland
- Biotechnology Research Laboratories, School of Biomedical Sciences, Monash University, Clayton, Victoria, Australia
| | - W Shi
- Biotechnology Research Laboratories, School of Biomedical Sciences, Monash University, Clayton, Victoria, Australia
| | | | - E N T Meeusen
- Biotechnology Research Laboratories, School of Biomedical Sciences, Monash University, Clayton, Victoria, Australia
| | | | - M J de Veer
- Biotechnology Research Laboratories, School of Biomedical Sciences, Monash University, Clayton, Victoria, Australia
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Lepleux C, Uroz S, Collignon C, Churin JL, Turpault MP, Frey-Klett P. A short-term mineral amendment impacts the mineral weathering bacterial communities in an acidic forest soil. Res Microbiol 2013; 164:729-39. [PMID: 23583355 DOI: 10.1016/j.resmic.2013.03.022] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [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: 01/04/2013] [Accepted: 03/19/2013] [Indexed: 11/29/2022]
Abstract
Mineral amendment (i.e. calcium, phosphorous, potassium and/or magnesium) is a management practice used in forestry to improve nutrient availability and recover soil fertility, especially in nutrient-poor forest ecosystems. However, whether this amendment can lead to modifications of the soil characteristics and an improvement in tree growth, and its impact on the soil bacterial communities, especially the mineral weathering bacterial communities, remains poorly documented. In this study, we investigated the short-term impact of a mineral amendment on the taxonomic and functional structure of the mineral weathering bacterial communities. To do this, a plantation of four-year old oak (Quercus petraea) trees amended with or without dolomite [CaMg(CO3)2] was established in the experimental forest site of Breuil-Chenue, which is characterized by an acidic soil and a low availability of calcium and magnesium. Three years after amendment, soil samples were used to isolate bacteria as well as to determine the soil characteristics and the metabolic potentials of these soil microbial communities. Based on a bioassay for quantifying the solubilisation of inorganic phosphorous, we demonstrate that the bacterial isolates coming from the non-amended bulk soil were significantly more efficient than those from the amended bulk soil. No difference was observed between the bacterial isolates coming from the amended and non-amended rhizospheres. Notably, the taxonomic analyses revealed a dominance of bacterial isolates belonging to the Burkholderia genus in both samples. Overall, our results suggest that the bioavailability of nutritive cations into soil impacts the distribution and the efficacy of mineral weathering bacterial communities coming from the soil but not those coming from the rhizosphere.
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Affiliation(s)
- C Lepleux
- INRA, UMR 1136 INRA Université de Lorraine Interactions Arbres Micro-organismes, Centre INRA de Nancy, 54280 Champenoux, France
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Collignon C, Zahra A, Guenego L, Gautier R, Madelenat A. Polyarthrite associée à une leishmaniose chez un jeune chien. Pratique Médicale et Chirurgicale de l'Animal de Compagnie 2009. [PMCID: PMC7147862 DOI: 10.1016/j.anicom.2009.01.002] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Un chien de race Cane corso, mâle, âgé de deux ans, est examiné en consultation pour abattement et dysorexie. Il présente également une boiterie d’appui persistante du membre postérieur gauche depuis plusieurs semaines. À l’examen clinique, le chien est en hyperthermie (39,3 °C) ; il a des saignements spontanés des babines, une polyadénomégalie périphérique, notamment des nœuds lymphatiques poplités, ainsi qu’une splénomégalie. Par ailleurs, l’examen orthopédique montre que les tarses sont gonflés et chauds. Cela laisse suspecter une synovite bilatérale. L’examen cytologique des nœuds lymphatiques et du liquide synovial permet de diagnostiquer avec certitude une leishmaniose. En effet, de très nombreuses formes amastigotes sont visualisées dans les macrophages. Une analyse par PCR sur sang, liquide synovial, suc ganglionnaire et ponction de moelle osseuse écarte l’ehrlichiose et la borréliose. Une PCR leishmaniose sur sang est également effectuée pour suivre la réponse au traitement. Malgré une forte infestation, une anémie non régénérative, une leucopénie, des signes de néphropathie et l’apparition d’une épistaxis, le chien est traité avec succès principalement à l’aide d’antimoniate de méglumine, d’allopurinol, de corticostéroïdes, associés à des antibiotiques.
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Choi WS, Collignon C, Thiriart C, Burns DP, Stott EJ, Kent KA, Desrosiers RC. Effects of natural sequence variation on recognition by monoclonal antibodies neutralize simian immunodeficiency virus infectivity. J Virol 1994; 68:5395-402. [PMID: 7520089 PMCID: PMC236939 DOI: 10.1128/jvi.68.9.5395-5402.1994] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
The determinants of immune recognition by five monoclonal antibodies (KK5, KK9, KK17, Senv7.1, and Senv101.1) that neutralize simian immunodeficiency virus infectivity were analyzed. These five neutralizing monoclonal antibodies were generated to native SIVmac251 envelope glycoprotein expressed by a vaccinia virus recombinant vector. All five recognize conformational or discontinuous epitopes and require native antigen for optimal recognition. These monoclonal antibodies also recognize SIVmac239 gp120, but they do not recognize gp120 of two natural variants of SIVmac239, 1-12 and 8-22, which evolved during the course of persistent infection in vivo (D.P.W. Burns and R.C. Desrosiers, J. Virol. 65:1843-1854, 1991). Recombinant viruses which were constructed by exchanging variable regions between SIVmac239 and variant 1-12 were used to define domains important for recognition. Radioimmunoprecipitation analysis demonstrated that sequence changes in variable regions 4 and 5 (V4/V5) were primarily responsible for the loss of recognition of the 1-12 variant. Site-specific mutants were used to define precise changes that eliminate recognition by these neutralizing antibodies. Changing N-409 to D, deletion of KPKE, and deletion of KEQH in V4 each resulted in loss of recognition by all five monoclonal antibodies. SIVs with these natural sequence changes are still replication competent and viable. Changing A-417 to T or A/N-417/418 to TK in V4 or Q-477 to K in V5 did not alter recognition detectably. These results define specific, naturally occurring sequence changes in V4 of SIVmac that result in loss of recognition by one class of SIVmac neutralizing antibodies.
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Affiliation(s)
- W S Choi
- New England Regional Primate Research Center, Harvard Medical School, Southborough, Massachusetts 01772-9102
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Burns DP, Collignon C, Desrosiers RC. Simian immunodeficiency virus mutants resistant to serum neutralization arise during persistent infection of rhesus monkeys. J Virol 1993; 67:4104-13. [PMID: 8510218 PMCID: PMC237779 DOI: 10.1128/jvi.67.7.4104-4113.1993] [Citation(s) in RCA: 102] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
We previously described the pattern of sequence variation in gp120 following persistent infection of rhesus monkeys with the pathogenic simian immunodeficiency virus SIVmac239 molecular clone (D.P.W. Burns and R.C. Desrosiers, J. Virol. 65:1843, 1991). Sequence changes were confined largely to five variable regions (V1 to V5), four of which correspond to human immunodeficiency virus type 1 (HIV-1) gp120 variable regions. Remarkably, 182 of 186 nucleotide substitutions that were documented in these variable regions resulted in amino acid changes. This is an extremely nonrandom pattern, which suggests selective pressure driving amino acid changes in discrete variable domains. In the present study, we investigated whether neutralizing-antibody responses are one selective force responsible at least in part for the observed pattern of sequence variation. Variant env sequences called 1-12 and 8-22 obtained 69 and 93 weeks after infection of a rhesus monkey with cloned SIVmac239 were recombined into the parental SIVmac239 genome, and variant viruses were generated by transfection of cultured cells with cloned DNA. The 1-12 and 8-22 recombinants differ from the parental SIVmac239 at 18 amino acid positions in gp120 and at 5 and 10 amino acid positions, respectively, in gp41. Sequential sera from the monkey infected with cloned SIVmac239 from which the 1-12 and 8-22 variants were isolated showed much higher neutralizing antibody titers to cloned SIVmac239 than to the cloned 1-12 and 8-22 variants. For example, at 55 weeks postinfection the neutralizing antibody titer against SIVmac239 was 640 while those to the variant viruses were 40 and less than 20. Two other rhesus monkeys infected with cloned SIVmac239 showed a similar pattern. Rhesus monkeys were also experimentally infected with the cloned variants so that the type-specific nature of the neutralizing antibody responses could be verified. Indeed, each of these monkeys showed neutralizing-antibody responses of much higher titer to the homologous variant used for infection. These experiments unambiguously demonstrate that SIV mutants resistant to serum neutralization arise during the course of persistent infection of rhesus monkeys.
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Affiliation(s)
- D P Burns
- New England Regional Primate Research Center, Harvard Medical School, Southborough, Massachusetts 01772-9102
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D'Souza MP, Kent KA, Thiriart C, Collignon C, Milman G. International collaboration comparing neutralization and binding assays for monoclonal antibodies to simian immunodeficiency virus. AIDS Res Hum Retroviruses 1993; 9:415-22. [PMID: 7686385 DOI: 10.1089/aid.1993.9.415] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [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: 01/26/2023] Open
Abstract
Thirteen laboratories characterized a coded panel of 10 MAbs to SIVmac251 envelope protein in a collaboration organized by the National Institute of Allergy and Infectious Diseases (NIAID). The MAbs were examined against SIV isolates in neutralization and radioimmune precipitation, immunoblot, enzyme-linked immunosorbent, and radioimmune assays. Although laboratories employed diverse neutralization assays that varied in sensitivity there was agreement on the relative ability of the MAbs to neutralize SIVmac251. Additionally, even though the quantity of any single MAb required to neutralize SIVmac251 varied between laboratories, there was agreement on the rank-order strength fo the five neutralizing MAbs. Based on the data from this study, the MAbs were classified according to their neutralization potential as high efficiency (MAb concentration, < 5 micrograms/ml), low efficiency (MAb concentration, 5-100 micrograms/ml), or nonneutralizing (MAb concentration, > 100 micrograms/ml). The MAbs could be assigned to four serological groups based on ability to cross-neutralize and bind different SIV isolates. The distinction between groups I, II, and III were based on the limited neutralization data obtained with the sooty mangabey isolate.
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Affiliation(s)
- M P D'Souza
- Division of AIDS, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892
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Kent KA, Rud E, Corcoran T, Powell C, Thiriart C, Collignon C, Stott EJ. Identification of two neutralizing and 8 non-neutralizing epitopes on simian immunodeficiency virus envelope using monoclonal antibodies. AIDS Res Hum Retroviruses 1992; 8:1147-51. [PMID: 1380261 DOI: 10.1089/aid.1992.8.1147] [Citation(s) in RCA: 90] [Impact Index Per Article: 2.8] [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: 12/26/2022] Open
Abstract
Ten new monoclonal antibodies (MAbs) to SIV envelope were produced and characterized. Using a panel of 28 MAbs, 10 antibody binding sites on SIV envelope protein were identified. Seven sites were located in gp120 and three in gp41. Five sites in gp120 and two in gp41 were defined by overlapping peptides. The remaining two sites on gp120 and one on gp41 were distinguished by competition binding assays but could not be defined by overlapping peptides, suggesting that they were discontinuous or conformational epitopes. Five of the 28 MAbs consistently and reliably neutralized the infectivity of SIVmac251. Two of these bound to a peptide (aa171-190) in the V2 region. The remaining three MAbs bound to a conformational epitope on gp120. These two neutralizing epitopes on SIV are analogous to similar epitopes recently described in HIV-1. In contrast, three MAbs binding to the V3 region of SIV failed to neutralize infectivity, suggesting that this region in SIV may by functionally different from the V3 loop in HIV-1.
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Affiliation(s)
- K A Kent
- National Institute for Biological Standards and Control, Potters Bar, Herts, England
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Kent KA, Gritz L, Stallard G, Cranage MP, Collignon C, Thiriart C, Corcoran T, Silvera P, Stott EJ. Production and of monoclonal antibodies to simian immunodeficiency virus envelope glycoproteins. AIDS 1991; 5:829-36. [PMID: 1716442 DOI: 10.1097/00002030-199107000-00006] [Citation(s) in RCA: 68] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Eighteen monoclonal antibodies (MAb) to simian immunodeficiency virus (SIV) envelope have been characterized. All MAb were shown to bind to viral antigens on the surface of unfixed SIV-infected cells and to precipitate surface glycoproteins of SIVmac251. In Western blot 11 MAb bound to gp160 and gp120, five bound to gp160 and the transmembrane protein gp41 and two MAb did not react with denatured antigen. Preliminary competition assays identified the existence of six competition groups; two groups were within gp41 and four were within gp120. Of the latter four groups, three contained MAb with neutralizing activity. Two of the neutralizing MAb (KK5 and KK9) did not react with denatured antigen in Western blot suggesting that they may recognize conformational epitopes. Enzyme-linked immunosorbent-assay titres of MAb against SIVmac251 ranged from 10(2.4) to 10(5.6) and although similar titres were obtained with some MAb against other SIV and HIV antigens, the presence of isolate specific and shared group epitopes was demonstrated.
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Affiliation(s)
- K A Kent
- National Institute for Biological Standards and Control, Hertfordshire, UK
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DiSilvestro RA, David EA, Collignon C. Interleukin 1 slowly increases lung fibroblast Cu-Zn superoxide dismutase activity levels. Proc Soc Exp Biol Med 1991; 197:197-200. [PMID: 2031055 DOI: 10.3181/00379727-197-43246] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Certain pulmonary stress raises rat lung Cu-Zn superoxide dismutase (SOD) activity levels, but cytokines released during stress are reported to exert no regulatory effects on Cu-Zn SOD levels in cultured cells. In contrast, our study found that interleukin 1 (IL-1) can increase Cu-Zn SOD activities in human W138 lung fibroblasts. The difference in results could be explained by differences in experimental conditions. The increases seen here did not occur during the first 24 hr, but Cu-Zn SOD activities more than doubled by 3 days. In addition, little increase occurred unless the medium was changed at 24-hr intervals. On the other hand, some other potential experimental variables showed little or no effects on IL-1-induced increases in Cu-Zn SOD activities. These variables included IL-1 isoform (alpha, beta, or both), IL-1 concentration (0.5, 2, 5, or 7 units IL-1 alpha/ml medium), and the presence or absence of exogenously added copper as CuO or ceruloplasmin. In addition, combining IL-1 with dexamethasone, a synthetic glucocorticoid that enhances some IL-1 actions, produced only additive, not synergistic, increases in Cu-Zn SOD activities. In conclusion, IL-1, in several different experimental protocols, raised lung fibroblast Cu-Zn SOD activity levels, but only after a 1 day lag time. Stress-induced increases in Cu-Zn SOD activity levels in vivo also tend to occur only after lag times.
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Affiliation(s)
- R A DiSilvestro
- Department of Foods and Nutrition, Purdue University, West Lafayette, Indiana 47907
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Thiriart C, Francotte M, Cohen J, Collignon C, Delers A, Kummert S, Molitor C, Gilles D, Roelants P, van Wijnendaele F. Several antigenic determinants exposed on the gp120 moiety of HIV-1 gp160 are hidden on the mature gp120. The Journal of Immunology 1989. [DOI: 10.4049/jimmunol.143.6.1832] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Abstract
Mouse mAb reactive to the HIV-1 envelope glycoprotein precursor gp160 of the HTLVIII(B) isolate were characterized in radioimmunoprecipitation and immunoblot tests with the use of HTLVIII(B) isolate as Ag. The reactivities of these mAb were also measured in a capture enzyme immunoassay and in radioimmunoprecipitation assay by using gp160 and gp120 expressed as vaccinia recombinants. Striking differences in exposure of specific epitopes were noted between the gp120 component of the gp160 precursor and the fully processed gp120 in both tests. These conformational rearrangements affecting the gp120 moiety of the HIV-1 envelope glycoprotein might have important implications on its immunogenicity.
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Affiliation(s)
- C Thiriart
- Department of Molecular and Cellular Biology, Smith Kline-RIT, Rixensart, Belgium
| | - M Francotte
- Department of Molecular and Cellular Biology, Smith Kline-RIT, Rixensart, Belgium
| | - J Cohen
- Department of Molecular and Cellular Biology, Smith Kline-RIT, Rixensart, Belgium
| | - C Collignon
- Department of Molecular and Cellular Biology, Smith Kline-RIT, Rixensart, Belgium
| | - A Delers
- Department of Molecular and Cellular Biology, Smith Kline-RIT, Rixensart, Belgium
| | - S Kummert
- Department of Molecular and Cellular Biology, Smith Kline-RIT, Rixensart, Belgium
| | - C Molitor
- Department of Molecular and Cellular Biology, Smith Kline-RIT, Rixensart, Belgium
| | - D Gilles
- Department of Molecular and Cellular Biology, Smith Kline-RIT, Rixensart, Belgium
| | - P Roelants
- Department of Molecular and Cellular Biology, Smith Kline-RIT, Rixensart, Belgium
| | - F van Wijnendaele
- Department of Molecular and Cellular Biology, Smith Kline-RIT, Rixensart, Belgium
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Thiriart C, Francotte M, Cohen J, Collignon C, Delers A, Kummert S, Molitor C, Gilles D, Roelants P, van Wijnendaele F. Several antigenic determinants exposed on the gp120 moiety of HIV-1 gp160 are hidden on the mature gp120. J Immunol 1989; 143:1832-6. [PMID: 2476484] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Mouse mAb reactive to the HIV-1 envelope glycoprotein precursor gp160 of the HTLVIII(B) isolate were characterized in radioimmunoprecipitation and immunoblot tests with the use of HTLVIII(B) isolate as Ag. The reactivities of these mAb were also measured in a capture enzyme immunoassay and in radioimmunoprecipitation assay by using gp160 and gp120 expressed as vaccinia recombinants. Striking differences in exposure of specific epitopes were noted between the gp120 component of the gp160 precursor and the fully processed gp120 in both tests. These conformational rearrangements affecting the gp120 moiety of the HIV-1 envelope glycoprotein might have important implications on its immunogenicity.
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Affiliation(s)
- C Thiriart
- Department of Molecular and Cellular Biology, Smith Kline-RIT, Rixensart, Belgium
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Sneyers M, Thiriart C, Bruyns C, Lambert AF, Collignon C, Schwers A, Coppe P, Antoine H, Franssen JD, Urbain J. Detection of rotavirus in faecal specimens with a monoclonal antibody enzyme-linked immunosorbent assay: comparison with polyclonal antibody enzyme immuno-assays and a latex agglutination test. Comp Immunol Microbiol Infect Dis 1989; 12:95-104. [PMID: 2558838 PMCID: PMC7134035 DOI: 10.1016/0147-9571(89)90058-1] [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] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Monoclonal antibodies have been produced against the 81/36F strain of rotavirus. One of them, was chosen as diagnostic reagent: it showed high ELISA reactivity with all the bovine, human and porcine rotavirus strains tested and reacted with VP6, structural protein product known to support the common rotavirus antigen. A sandwich ELISA procedure using the chosen monoclonal as "capture and detecting" antibody was performed to detect rotavirus in faecal samples from experimentally inoculated newborn calves: it always gave a negative response with meconium and a positive response for the stool specimens which rotavirus have been isolated. This assay was compared with Enzygnost and Slidex Rota Kit tests and with a non-commercial sandwich ELISA test using polyclonal antibodies: it showed more sensitivity than the agglutination test and was as sensitive as the other two tests to detect rotavirus in routine diagnostic material. The test evaluated showed no equivocal results.
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Affiliation(s)
- M Sneyers
- Faculté de Médecine vétérinaire de l'Université de Liège, Institut de Chimie, Belgium
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Winkler M, Franssen JD, Collignon C, Leo O, Mariamé B, van de Walle P, de Groote D, Urbain J. Idiotypic regulation of the immune system. Common idiotypic specificities between idiotypes and antibodies raised against anti-idiotypic antibodies in rabbits. J Exp Med 1979; 150:184-95. [PMID: 312906 PMCID: PMC2185609 DOI: 10.1084/jem.150.1.184] [Citation(s) in RCA: 72] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Anti-idiotypic antibodies (Ab2) were raised in allotype-matched rabbits against anti-carbohydrate or anti-tobacco mosaic virus antibodies (Ab1). Several Ab2 were purified and injected into a third series of rabbits III which synthesized antiantiidiotypic antibodies (Ab3). Antigen was then given for the first time in those rabbits who had synthesized Ab3. The specific antibody synthesized in rabbits III was called Ab1'. Anti-idiotypic antibodies were raised against purified Ab3 antibodies (Ab4). In most cases, Ab1' antibodies are sharing idiotypic specificities with Ab1. Ab3 did not react with antigen but shared idiotopes with Ab1 and Ab1' because Ab4 antibodies, which are anti-idiotypes to Ab3 do recognize specifically Ab1 and Ab1' antibodies belonging to the same chain of immunization. It seems therefore that Ab3 looks idiotypically like Ab1 and Ab4 displays the same behaviour as Ab2. A general view of the functioning of the immune system is presented.
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Urbain J, Collignon C, Franssen JD, Mariamé B, Léo O, Urbain-Vansanten G, Van de Walle P, Wikler M, Wuilmart C. Idiotypic networks and self-recognition in the immune system. Ann Immunol (Paris) 1979; 130:281-91. [PMID: 313746] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Urbain J, Wikler M, Franssen JD, Collignon C. Idiotypic regulation of the immune system by the induction of antibodies against anti-idiotypic antibodies. Proc Natl Acad Sci U S A 1977; 74:5126-30. [PMID: 303775 PMCID: PMC432113 DOI: 10.1073/pnas.74.11.5126] [Citation(s) in RCA: 175] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Anticarbohydrate antibodies (Ab1) were isolated from a rabbit hyperimmunized with Micrococcus lysodeikticus and injected into allotype-matched rabbits in order to obtain specific anti-iodiotypic antibodies (Ab2). Ab2 was isolated by means of a Sepharose column coupled to the anticarbohydrate antibodies and was injected into two allotype-matched rabbits. These latter rabbits produced specific anti-anti-idiotypic antibodies (Ab3) probably sharing idiotypic specificities with Ab1. However, these Ab3 did not react with the antigenic carbohydrate moiety of bacteria. The two rabbits that had produced Ab3 were then immunized with M. lysodeikticus and synthesized anticarbohydrate antibodies (Ab1') bearing idiotypic specificities similar to those of Ab1. The immune repertoire which is effectively expressed in one individual depends not only on the antigenic stimulation but also on the previous idiotypic history of the individual. These data support the concept that the immune system is a functional idiotypic network.
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