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Gerwing M, Hoffmann E, Geyer C, Helfen A, Maus B, Schinner R, Wachsmuth L, Heindel W, Eisenblaetter M, Faber C, Wildgruber M. Intratumoral heterogeneity after targeted therapy in murine cancer models with differing degrees of malignancy. Transl Oncol 2023; 37:101773. [PMID: 37666208 PMCID: PMC10483060 DOI: 10.1016/j.tranon.2023.101773] [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: 06/30/2023] [Revised: 08/16/2023] [Accepted: 08/25/2023] [Indexed: 09/06/2023] Open
Abstract
INTRODUCTION Conventional morphologic and volumetric assessment of treatment response is not suitable for adequately assessing responses to targeted cancer therapy. The aim of this study was to evaluate changes in tumor composition after targeted therapy in murine models of breast cancer with differing degrees of malignancy via non-invasive magnetic resonance imaging (MRI). MATERIALS AND METHODS Mice bearing highly malignant 4T1 tumors or low malignant 67NR tumors were treated with either a combination of two immune checkpoint inhibitors (ICI, anti-PD1 and anti-CTLA-4) or the multi-tyrosine kinase inhibitor sorafenib, following experiments with macrophage-depleting clodronate-loaded liposomes and vessel-stabilizing angiopoietin-1. Mice were imaged on a 9.4 T small animal MRI system with a multiparametric (mp) protocol, comprising T1 and T2 mapping and diffusion-weighted imaging. Tumors were analyzed ex vivo with histology. RESULTS AND DISCUSSIONS All treatments led to an increase in non-viable areas, but therapy-induced intratumoral changes differed between the two tumor models and the different targeted treatments. While ICI treatment led to intratumoral hemorrhage, sorafenib treatment mainly induced intratumoral necrosis. Treated 4T1 tumors showed increasing and extensive areas of necrosis, in comparison to 67NR tumors with only small, but also increasing, necrotic areas. After either of the applied treatments, intratumoral heterogeneity, was increased in both tumor models, and confirmed ex vivo by histology. Apparent diffusion coefficient with subsequent histogram analysis proved to be the most sensitive MRI sequence. In conclusion, mp MRI enables to assess dedicated therapy-related intratumoral changes and may serve as a biomarker for treatment response assessment.
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Affiliation(s)
- M Gerwing
- Clinic of Radiology, University of Münster, Münster, Germany.
| | - E Hoffmann
- Clinic of Radiology, University of Münster, Münster, Germany
| | - C Geyer
- Clinic of Radiology, University of Münster, Münster, Germany
| | - A Helfen
- Clinic of Radiology, University of Münster, Münster, Germany
| | - B Maus
- Clinic of Radiology, University of Münster, Münster, Germany
| | - R Schinner
- Department of Radiology, University Hospital, LMU Munich, Munich, Germany
| | - L Wachsmuth
- Clinic of Radiology, University of Münster, Münster, Germany
| | - W Heindel
- Clinic of Radiology, University of Münster, Münster, Germany
| | - M Eisenblaetter
- Department of Diagnostic and Interventional Radiology, Medical Faculty OWL, University of Bielefeld, Bielefeld, Germany
| | - C Faber
- Clinic of Radiology, University of Münster, Münster, Germany
| | - M Wildgruber
- Clinic of Radiology, University of Münster, Münster, Germany; Department of Radiology, University Hospital, LMU Munich, Munich, Germany
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Pongratz J, Riess L, Hartl S, Brueck B, Tesche C, Ebersberger U, Helmberger T, Crispin A, Wankerl M, Dorwarth U, Hoffmann E, Straube F. Left atrial appendage volume is an independent predictor of atrial arrhythmia recurrence following cryoballoon pulmonary vein isolation in persistent atrial fibrillation. Front Cardiovasc Med 2023; 10:1190860. [PMID: 37404733 PMCID: PMC10315839 DOI: 10.3389/fcvm.2023.1190860] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2023] [Accepted: 06/02/2023] [Indexed: 07/06/2023] Open
Abstract
Purpose Pulmonary vein isolation (PVI) is the cornerstone of atrial fibrillation (AF) ablation in persistent AF (persAF), and cryoballoon PVI emerged as an initial ablation strategy. Symptomatic atrial arrhythmia recurrence following successful PVI in persAF is observed more frequently than in paroxysmal AF. Predictors for arrhythmia recurrence following cryoballoon PVI for persAF are not well described, and the role of left atrial appendage (LAA) anatomy is uncertain. Methods Patients with symptomatic persAF and pre-procedural cardiac computed tomography angiography (CCTA) images undergoing initial second-generation cryoballoon (CBG2) were enrolled. Left atrial (LA), pulmonary vein (PV) and LAA anatomical data were assessed. Clinical outcome and predictors for atrial arrhythmia recurrence were evaluated by univariate and multivariate regression analysis. Results From May 2012 to September 2016, 488 consecutive persAF patients underwent CBG2-PVI. CCTA with sufficient quality for measurements was available in 196 (60.4%) patients. Mean age was 65.7 ± 9.5 years. Freedom from arrhythmia was 58.2% after a median follow-up of 19 (13; 29) months. No major complications occurred. Independent predictors for arrhythmia recurrence were LAA volume (HR 1.082; 95% CI, 1.032 to 1.134; p = 0.001) and mitral regurgitation ≥ grade 2 (HR, 2.49; 95% CI 1.207 to 5.126; p = 0.013). LA volumes ≥110.35 ml [sensitivity: 0.81, specificity: 0.40, area under the curve (AUC) = 0.62] and LAA volumes ≥9.75 ml (sensitivity: 0.56, specificity 0.70, AUC = 0.64) were associated with recurrence. LAA-morphology, classified as chicken-wing (21.9%), windsock (52.6%), cactus (10.2%) and cauliflower (15.3%), did not predict outcome (log-rank, p = 0.832). Conclusion LAA volume and mitral regurgitation were independent predictors for arrhythmia recurrence following cryoballoon ablation in persAF. LA volume was less predictive and correlated with LAA volume. LAA morphology did not predict the clinical outcome. To improve outcomes in persAF ablation, further studies should focus on treatment strategies for persAF patients with large LAA and mitral regurgitation.
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Affiliation(s)
- J. Pongratz
- Heart Center Munich-Bogenhausen, Department of Cardiology and Internal Intensive Care Medicine, Munich Hospital Bogenhausen, Munich Municipal Hospital Group, Munich, Germany
| | - L. Riess
- Heart Center Munich-Bogenhausen, Department of Cardiology and Internal Intensive Care Medicine, Munich Hospital Bogenhausen, Munich Municipal Hospital Group, Munich, Germany
| | - S. Hartl
- Department of Electrophysiology, Alfried Krupp Hospital, Essen, Germany
- Department of Medicine, Witten/Herdecke University, Witten, Germany
| | - B. Brueck
- Kardiologie Praxis Erkelenz, Erkelenz, Germany
| | - C. Tesche
- Department of Cardiology, Clinic Augustinum Munich, Munich, Germany
| | | | - T. Helmberger
- Department of Radiology, Neuroradiology and Nuclear Medicine, Munich Hospital Bogenhausen, Munich Municipal Hospital Group, Munich, Germany
| | - A. Crispin
- Institute for Medical Information Processing, Biometry and Epidemiology of the Ludwig-Maximilians-University, Campus Grosshadern, Munich, Germany
| | - M. Wankerl
- Heart Center Munich-Bogenhausen, Department of Cardiology and Internal Intensive Care Medicine, Munich Hospital Bogenhausen, Munich Municipal Hospital Group, Munich, Germany
| | - U. Dorwarth
- Heart Center Munich-Bogenhausen, Department of Cardiology and Internal Intensive Care Medicine, Munich Hospital Bogenhausen, Munich Municipal Hospital Group, Munich, Germany
| | - E. Hoffmann
- Heart Center Munich-Bogenhausen, Department of Cardiology and Internal Intensive Care Medicine, Munich Hospital Bogenhausen, Munich Municipal Hospital Group, Munich, Germany
| | - F. Straube
- Heart Center Munich-Bogenhausen, Department of Cardiology and Internal Intensive Care Medicine, Munich Hospital Bogenhausen, Munich Municipal Hospital Group, Munich, Germany
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Eckert F, Ganser K, Bender B, Schittenhelm J, Noell S, Stransky N, Hoffmann E, Zips D, Huber S, Paulsen F. P03.07.A MRI signature in preoperative imaging predicts mesenchymal stem cell features and radioresistance in primary glioblastoma stem cell cultures. Neuro Oncol 2022. [DOI: 10.1093/neuonc/noac174.111] [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] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background
Recently, a molecular signature describing the mesenchymal / proneural features of primary stem-cell-enriched glioblastoma cultures was identified correlating with invasiveness, radiation sensitivity and patient-outcome. However, generating and characterizing primary cultures is time-consuming and this might hamper translation into clinical concepts. The aim of this study was to evaluate the use of standard preoperative MR imaging (T1ce and T2FLAIR sequences) to predict the molecular signature and thus enable the development of clinical treatment concepts based on the molecular properties of the individual tumors.
Material and Methods
For 16 patients, for whom primary stem cell enriched cultures had been characterized for their mesenchymal / proneural signature and radiation sensitivity, tumor volume (hyperintense volume in T1ce), necrosis (hypointense volume inside the tumor volume) and edema (hyperintense volume in T2FLAIR) were contoured for volumetric analysis. Volume parameters were used to calculate ratios (edema/tumor and necrosis/tumor) and a MRI signature, which was then correlated with molecular parameters and patient outcome stratified by MGMT promoter methylation.
Results
As expected, the prognosis of patients with MGMT-promoter-methylated tumors was better (n.s.) compared to those with unmethylated MGMT promoters. Neither molecular nor imaging data were significantly different between these subgroups. In the subgroup of patients with unmethylated MGMT promoter, volumetric imaging parameters correlated with the molecular signature and cellular radiation sensitivity of the stem cell enriched cultures. This association was much weaker in the subgroup with methylated MGMT promoter.
Conclusion
In the subgroup of patients with unmethylated MGMT promoter, volumetric parameters on preoperative standard MR imaging might hint at the molecular properties of the respective tumor and its radiation sensitivity. This might be a clinically applicable method to stratify treatment according to molecular stem cell subtype without tissue culture and molecular analysis.
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Affiliation(s)
- F Eckert
- Medical University Vienna , Vienna , Austria
| | - K Ganser
- Eberhard Karls University Tuebingen , Tuebingen , Germany
| | - B Bender
- Eberhard Karls University Tuebingen , Tuebingen , Germany
| | - J Schittenhelm
- Eberhard Karls University Tuebingen , Tuebingen , Germany
| | - S Noell
- Eberhard Karls University Tuebingen , Tuebingen , Germany
| | - N Stransky
- Eberhard Karls University Tuebingen , Tuebingen , Germany
| | - E Hoffmann
- Eberhard Karls University Tuebingen , Tuebingen , Germany
| | - D Zips
- Eberhard Karls University Tuebingen , Tuebingen , Germany
| | - S Huber
- Eberhard Karls University Tuebingen , Tuebingen , Germany
| | - F Paulsen
- Eberhard Karls University Tuebingen , Tuebingen , Germany
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Wang D, Hildorf S, Ntemou E, Dong L, Pors S, Mamsen L, Fedder J, Hoffmann E, Clasen-Linde E, Cortes D, Thorup J, Andersen C. P-468 Organotypic culture of testicular tissue from infant boys with cryptorchidism. Hum Reprod 2022. [DOI: 10.1093/humrep/deac107.440] [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] [Indexed: 11/15/2022] Open
Abstract
Abstract
Study question
Can organotypic culture support the survival and maturation of germ cells and niche-related cells within testicular tissue from infant boys with cryptorchidism?
Summary answer
The testicular structure and the number of germ cells were maintained during organotypic culture, whereas Sertoli cells and peritubular myoid cells (PTMCs) matured.
What is known already
Testicular tissue cryopreservation (TTC) is a strategy to safeguard the fertility of prepubertal boys who face a risk of infertility. Organotypic culture of immature testicular tissue from mice achieved production of spermatozoa. Similarly, the culture of human fetal gonads resulted in the generation of competent spermatids. However , in vitro spermatogenesis by organotypic culture of human prepubertal testicular tissue has not been achieved. It is also unknown whether germ cells as well as its niche-related cells, in testicular tissue from infant boys with cryptorchidism, can maintain and mature under in vitro conditions.
Study design, size, duration
Testicular tissue was cryopreserved from four infant boys with bilateral cryptorchidism undergoing orchidopexy (age range: 0.5-1.4 years), as part of a fertility preservation program. Culture media with and without retinoic acid were tested. Testicular fragments were harvested at 30 days and 60 days after culture and evaluated by histological assessment of tissue structure, germ cell development, and immunohistochemical staining for germ cell and somatic cell markers.
Participants/materials, setting, methods
Cryopreserved-thawed testicular tissue was cut into fragments (1-2 mm3) and placed on top of agarose gel stands and cultured at 34oC with 5% CO2 in Minimum Essential Medium-alpha supplemented with knockout serum replacement, human umbilical cord plasma, Activin A, hormones, growth factors, with or without retinoic acid. Immunohistochemical analyses were performed using germ cell markers (MAGE-A, GAGE, and VASA), Sertoli cell maturation markers (AMH, AR, SOX9), PTMC marker (alpha-SMA).
Main results and the role of chance
Following the 60-day culture, the lumen of the seminiferous tubules had developed. The number of germ cells per tubule remained stable during this period. However, no further germ cell maturation was observed. Germ cells showed different phenotypes of MAGEA, GAGE, and VASA expression with no significant difference in number. The number of SOX9-positive Sertoli cells was significantly increased from 30 days to 60 days of culture (p <0.0001). No difference in AMH expression was observed, while AR expression in Sertoli cells was induced during culture. Alpha-SMA expression was detected in the PTMCs surrounding the seminiferous tubules. The two different culture conditions, with and without retinoic acid in the culture media, did not affect cell survival or maturation.
Limitations, reasons for caution
The small number of testicular biopsies available is a limitation.
Wider implications of the findings
Our organotypic culture conditions support the long-term survival of germ cells in testicular tissue from infant boys with cryptorchidism. Thus, further studies are needed to induce the maturation of germ cells under similar experimental conditions.
Trial registration number
not applicable
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Affiliation(s)
- D Wang
- University Hospital of Copenhagen- Rigshospitalet, Laboratory of Reproductive Biology , Copenhagen, Denmark
| | - S Hildorf
- University Hospital of Copenhagen- Rigshospitalet, Department of Pediatric Surgery , Copenhagen, Denmark
| | - E Ntemou
- University Hospital of Copenhagen- Rigshospitalet, Laboratory of Reproductive Biology , Copenhagen, Denmark
| | - L Dong
- University Hospital of Copenhagen- Rigshospitalet, Laboratory of Reproductive Biology , Copenhagen, Denmark
| | - S Pors
- University Hospital of Copenhagen- Rigshospitalet, Laboratory of Reproductive Biology , Copenhagen, Denmark
| | - L Mamsen
- University Hospital of Copenhagen- Rigshospitalet, Laboratory of Reproductive Biology , Copenhagen, Denmark
| | - J Fedder
- Odense University Hospital, Centre of Andrology & Fertility Clinic- Department D , Odense, Denmark
| | - E Hoffmann
- Faculty of Health and Medical Sciences- University of Copenhagen, DNRF Center for Chromosome Stability- Department of Cellular and Molecular Medicine , Copenhagen, Denmark
| | - E Clasen-Linde
- Copenhagen University Hospital- Rigshospitalet, Department of Pathology , Copenhagen, Denmark
| | - D Cortes
- Copenhagen University Hospital Hvidovre, Department of Pediatrics and Adolescent Medicine , Copenhagen, Denmark
| | - J Thorup
- University Hospital of Copenhagen- Rigshospitalet, Department of Pediatric Surgery , Copenhagen, Denmark
| | - C Andersen
- University Hospital of Copenhagen- Rigshospitalet, Laboratory of Reproductive Biology , Copenhagen, Denmark
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Eckert F, Hoffmann E, Zips D, Paulsen F. PO-1163 Metaanalysis of fractionation schedules to hypothesize a benefit of dose escalation in glioblastoma. Radiother Oncol 2022. [DOI: 10.1016/s0167-8140(22)03127-9] [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: 11/28/2022]
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Schleberger R, Metzner A, Kuck KH, Andresen D, Willems S, Hoffmann E, Deneke T, Eckardt L, Brachmann J, Hochadel M, Senges J, Rillig A. Antiarrhythmic drug therapy after catheter ablation for atrial fibrillation has no impact on recurrences, cardiovascular events and mortality – insights from the German Ablation Registry. Eur Heart J 2021. [DOI: 10.1093/eurheartj/ehab724.0357] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background
Data on the optimal treatment strategy for antiarrhythmic drug therapy (AAD) after atrial fibrillation (AF) catheter ablation are inconsistent. While AAD potentially stabilizes sinus rhythm, it also increases the patients' treatment burden.
Methods
Patients from the prospective German Ablation Registry (n=3275) discharged with or without AAD after AF catheter ablation were compared regarding long-term success, cardiovascular events and patient reported outcome.
Results
In patients with paroxysmal AF (n=2138) recurrence and rehospitalization rates did not differ when discharged with (n=1051) or without (n=1087) AAD (recurrence: adjusted odds ratio (OR) 1.13, 95% confidence interval (CI) [0.95–1.35]; rehospitalization: OR 1.08, 95% CI [0.90–1.30]). The reablation rate was higher and reduced treatment satisfaction was reported more often in those discharged with AAD (reablation: OR 1.30, 95% CI [1.05–1.61]; reduced treatment satisfaction: OR 1.76, 95% CI [1.20–2.58]).
Similar rates of recurrences, rehospitalisations, reablations and treatment satisfaction were found in patients with persistent AF (n=1137) discharged with (n=641) or without (n=496) AAD (recurrence: OR 1.22, 95% CI [0.95–1.56]; rehospitalization: OR 1.16, 95% CI [0.90–1.50]; reablation: OR 1.21, 95% CI [0.91–1.61]; treatment satisfaction: OR 1.24, 95% CI [0.74–2.08]).
The incidence of cardiovascular events and mortality did not differ at follow-up in paroxysmal and persistent AF patients discharged with or without AAD.
Conclusion
The rates of recurrences, cardiovascular events and mortality did not differ between patients discharged with or without AAD after AF catheter ablation. However, AAD should be considered carefully in patients with paroxysmal AF, in whom it was associated with a higher reablation rate and reduced treatment satisfaction.
Funding Acknowledgement
Type of funding sources: None.
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Affiliation(s)
- R Schleberger
- University Heart & Vascular Center Hamburg, Hamburg, Germany
| | - A Metzner
- University Heart & Vascular Center Hamburg, Hamburg, Germany
| | | | | | - S Willems
- Asklepios Clinic St. Georg, Hamburg, Germany
| | | | - T Deneke
- Heart Center Bad Neustadt, Bad Neustadt a. d. Saale, Germany
| | - L Eckardt
- Muenster University Hospital, Muenster, Germany
| | | | - M Hochadel
- Stiftung Institut fuer Herzinfarktforschung, Ludwigshafen, Germany
| | - J Senges
- Stiftung Institut fuer Herzinfarktforschung, Ludwigshafen, Germany
| | - A Rillig
- University Heart & Vascular Center Hamburg, Hamburg, Germany
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Spur G, Hoffmann E, Paluncic Z. Erweiterte Ansätze zur Beschreibung des Erwärmungs- und Abkühlungsvorgangs bei Werkzeugmaschinen-Hauptspindeln. ACTA ACUST UNITED AC 2021. [DOI: 10.1515/zwf-1988-831026] [Citation(s) in RCA: 1] [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] [Indexed: 11/15/2022]
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Fischer C, Munks MW, Hill AB, Kroczek RA, Bissinger S, Brand V, Schmittnaegel M, Imhof-Jung S, Hoffmann E, Herting F, Klein C, Knoetgen H. Vaccine-induced CD8 T cells are redirected with peptide-MHC class I-IgG antibody fusion proteins to eliminate tumor cells in vivo. MAbs 2020; 12:1834818. [PMID: 33151105 PMCID: PMC7668529 DOI: 10.1080/19420862.2020.1834818] [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] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Simulating a viral infection in tumor cells is an attractive concept to eliminate tumor cells. We previously reported the molecular design and the in vitro potency of recombinant monoclonal antibodies fused to a virus-derived peptide MHC class I complex that bypass the peptide processing and MHC loading pathway and directly displays a viral peptide in an MHC class I complex on the tumor cell surface. Here, we show that a vaccination-induced single peptide-specific CD8 T cell response was sufficient to eliminate B16 melanoma tumor cells in vivo in a fully immunocompetent, syngeneic mouse tumor model when mice were treated with mouse pMHCI-IgGs fusion proteins targeting the mouse fibroblast activation protein. Tumor growth of small, established B16 lung metastases could be controlled. The pMHCI-IgG had similar potency as an analogous pan-CD3 T-cell bispecific antibody. In contrast to growth control of small tumors, none of the compounds controlled larger solid tumors of MC38 cancer cells, despite penetration of pMHCI-IgGs into the tumor tissue and clear attraction and activation of antigen-specific CD8 T cells inside the tumor. pMHCI-IgG can have a similar potency as classical pan-T-cell recruiting molecules. The results also highlight the need to better understand immune suppression in advanced solid tumors.
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Affiliation(s)
- Cornelia Fischer
- Large Molecule Research, Roche Innovation Center Munich , Penzberg, Germany
| | - Michael W Munks
- Department of Molecular Microbiology and Immunology, Oregon Health & Science University , Portland, OR, USA
| | - Ann B Hill
- Department of Molecular Microbiology and Immunology, Oregon Health & Science University , Portland, OR, USA
| | | | - Stefan Bissinger
- Discovery Oncology, Roche Innovation Center Munich , Penzberg, Germany
| | - Verena Brand
- Discovery Oncology, Roche Innovation Center Munich , Penzberg, Germany
| | | | - Sabine Imhof-Jung
- Large Molecule Research, Roche Innovation Center Munich , Penzberg, Germany
| | - Eike Hoffmann
- Large Molecule Research, Roche Innovation Center Munich , Penzberg, Germany
| | - Frank Herting
- Discovery Oncology, Roche Innovation Center Munich , Penzberg, Germany
| | - Christian Klein
- Discovery Oncology, Roche Innovation Center Zurich , Zurich, Switzerland
| | - Hendrik Knoetgen
- Therapeutic Modalities, Roche Innovation Center Basel , Basel, Switzerland
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Stamer UM, Stammschulte T, Erlenwein J, Koppert W, Freys S, Meißner W, Ahrens P, Brede EM, Lindig M, Dusch M, Heitfeld S, Hoffmann E, Lux EA, Müller E, Pauli-Magnus D, Pogatzki-Zahn E, Quaisser-Kimpfbeck C, Ringeler U, Rittner H, Ulma J, Wirz S. [Recommendations for the perioperative use of dipyrone : Expert recommendation of the working group on acute pain of the German Pain Society, the scientific working group on pain medicine of the German Society for Anesthesiology and Intensive Care Medicine and the surgical working group on acute pain of the German Society for Surgery with participation of representatives of the Drug Commission of the German Medical Association]. Anaesthesist 2020; 68:520-529. [PMID: 31396674 DOI: 10.1007/s00101-019-0622-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [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] [Indexed: 11/30/2022]
Abstract
BACKGROUND Dipyrone (metamizole) is widely used for perioperative pain management in countries where it is marketed; however, uncertainty exists concerning the safe use of this drug, specifically considering the rare adverse event of an agranulocytosis. METHODS As evidence from published studies was lacking, an expert panel developed recommendations for the perioperative use of dipyrone. After a formal, structured consensus process, the recommendations were approved by the involved medical societies. RESULTS The panel agreed that blood cell counts shall not be standard for short-term perioperative use in patients unless they are at risk for neutropenia. The medical staff shall be aware of the symptoms and course of action when agranulocytosis is suspected. Patients shall be informed about the risks and benefits of dipyrone and about potential alternatives. The expert group concluded that dipyrone has a relatively positive risk-benefit ratio compared to other nonopioid analgesics. The group strongly recommended educating patients about the symptoms of agranulocytosis if they have received dipyrone over several days and/or treatment is to be continued after discharge, because agranulocytosis can occur several days after discontinuation of metamizole. Further recommendations refer to the information of the physician taking over the patient's care after discharge and the avoidance of re-exposure in patients having previously suffered from dipyrone-induced agranulocytosis. CONCLUSION The group's recommendations shall be communicated in order to raise medical staff's and patients' awareness of the appropriate use of dipyrone in the perioperative period.
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Affiliation(s)
- U M Stamer
- Klinik für Anästhesiologie und Schmerztherapie, Universitätsklinik Bern, Inselspital, Universität Bern, Freiburgstraße, 3010, Bern, Schweiz.
| | - T Stammschulte
- Arzneimittelkommission der deutschen Ärzteschaft, Berlin, Deutschland
| | - J Erlenwein
- Klinik für Anästhesiologie, GF Schmerzmedizin, Universitätsmedizin Göttingen, Göttingen, Deutschland
| | - W Koppert
- Klinik für Anästhesiologie und Intensivmedizin, Medizinische Hochschule Hannover, Hannover, Deutschland
| | - S Freys
- Chirurgische Klinik, DIAKO Ev. Diakonie-Krankenhaus Bremen, Bremen, Deutschland
| | - W Meißner
- Klinik für Anästhesiologie und Intensivmedizin, Universitätsklinikum Jena, Jena, Deutschland
| | - P Ahrens
- Abteilung Anästhesie und operative Intensivmedizin, Aller-Weser-Klinik, Verden, Deutschland
| | - E-M Brede
- Klinik und Poliklinik für Anästhesiologie, Zentrum Interdisziplinäre Schmerzmedizin, Universitätsklinikum Würzburg, Würzburg, Deutschland
| | - M Lindig
- Klinik für Anästhesiologie und Intensivmedizin, Universitätsklinikum Schleswig-Holstein, Campus Lübeck, Universität zu Lübeck, Lübeck, Deutschland
| | - M Dusch
- Klinik für Anästhesiologie und Intensivmedizin, Medizinische Hochschule Hannover, Hannover, Deutschland
| | - S Heitfeld
- Klinik und Poliklinik für Anästhesiologie und Intensivtherapie, UniversitätsSchmerzCentrum Dresden, Dresden, Deutschland
| | - E Hoffmann
- Klinik für Anästhesie, operative Intensivmedizin, Notfall- und Schmerzmedizin, Evangelisches Krankenhaus Herne, Herne, Deutschland
| | - E A Lux
- Klinik für Schmerz- und Palliativmedizin, Katholisches Klinikum Lünen-Werne, Lünen, Deutschland
| | - E Müller
- Klinik für Anästhesiologie, Universitätsmedizin Greifswald, Greifswald, Deutschland
| | - D Pauli-Magnus
- Klinik für Anästhesie, Schmerztherapie, Intensiv- und Notfallmedizin, DRK Kliniken Berlin Westend, Berlin, Deutschland
| | - E Pogatzki-Zahn
- Klinik für Anästhesiologie, operative Intensivmedizin und Schmerztherapie, Universitätsklinikum Münster, Münster, Deutschland
| | - C Quaisser-Kimpfbeck
- Abteilung für Anästhesie und Schmerztherapie, Klinikum Freising, Freising, Deutschland
| | - U Ringeler
- Abteilung für Anästhesiologie, Palliativ‑, Intensiv- und Schmerzmedizin, Paracelsus-Klinik Golzheim, Düsseldorf, Deutschland
| | - H Rittner
- Arzneimittelkommission der deutschen Ärzteschaft, Berlin, Deutschland
- Klinik und Poliklinik für Anästhesiologie, Zentrum Interdisziplinäre Schmerzmedizin, Universitätsklinikum Würzburg, Würzburg, Deutschland
| | - J Ulma
- Klinik für Schmerzmedizin und Schmerzambulanz, Rotes Kreuz Krankenhaus Bremen, Bremen, Deutschland
| | - S Wirz
- Abteilung für Anästhesie, Interdisziplinäre Intensivmedizin, Schmerzmedizin/Palliativmedizin, Zentrum für Schmerzmedizin, Weaningzentrum, CURA-GFO Kliniken Bonn, Bad Honnef, Deutschland
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10
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Dengl S, Mayer K, Bormann F, Duerr H, Hoffmann E, Nussbaum B, Tischler M, Wagner M, Kuglstatter A, Leibrock L, Buldun C, Georges G, Brinkmann U. Format chain exchange (FORCE) for high-throughput generation of bispecific antibodies in combinatorial binder-format matrices. Nat Commun 2020; 11:4974. [PMID: 33009381 PMCID: PMC7532213 DOI: 10.1038/s41467-020-18477-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Accepted: 08/20/2020] [Indexed: 12/17/2022] Open
Abstract
Generation of bispecific antibodies (bsAbs) requires a combination of compatible binders in formats that support desired functionalities. Here, we report that bsAb-matrices can be generated by Format Chain Exchange (FORCE), enabling screening of combinatorial binder/format spaces. Input molecules for generation of bi/multi-valent bsAbs are monospecific entities similar to knob-into-hole half-antibodies, yet with complementary CH3-interface-modulated and affinity-tagged dummy-chains. These contain mutations that lead to limited interface repulsions without compromising expression or biophysical properties of educts. Mild reduction of combinations of educts triggers spontaneous chain-exchange reactions driven by partially flawed CH3-educt interfaces resolving to perfect complementarity. This generates large bsAb matrices harboring different binders in multiple formats. Benign biophysical properties and good expression yields of educts, combined with simplicity of purification enables process automation. Examples that demonstrate the relevance of screening binder/format combinations are provided as a matrix of bsAbs that simultaneously bind Her1/Her2 and DR5 without encountering binder or format-inflicted interferences. Bispecific antibodies have been generated in many different formats and it is becoming clear that rational design alone cannot create optimal functionalities. Here the authors introduce the high throughput methodology, Format Chain Exchange (FORCE), to enable combinatorial generation of bispecific antibodies.
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Affiliation(s)
- Stefan Dengl
- Roche Pharma Research and Early Development (pRED), Large Molecule Research, Roche Innovation Center Munich, Penzberg, Germany
| | - Klaus Mayer
- Roche Pharma Research and Early Development (pRED), Large Molecule Research, Roche Innovation Center Munich, Penzberg, Germany
| | - Felix Bormann
- Roche Pharma Research and Early Development (pRED), Large Molecule Research, Roche Innovation Center Munich, Penzberg, Germany
| | - Harald Duerr
- Roche Pharma Research and Early Development (pRED), Large Molecule Research, Roche Innovation Center Munich, Penzberg, Germany
| | - Eike Hoffmann
- Roche Pharma Research and Early Development (pRED), Large Molecule Research, Roche Innovation Center Munich, Penzberg, Germany
| | - Bianca Nussbaum
- Roche Pharma Research and Early Development (pRED), Large Molecule Research, Roche Innovation Center Munich, Penzberg, Germany
| | - Michael Tischler
- Roche Pharma Research and Early Development (pRED), Large Molecule Research, Roche Innovation Center Munich, Penzberg, Germany
| | - Martina Wagner
- Roche Pharma Research and Early Development (pRED), Large Molecule Research, Roche Innovation Center Munich, Penzberg, Germany
| | - Andreas Kuglstatter
- Roche Pharma Research and Early Development (pRED), Structural Biology, Roche Innovation Center Basel, Basel, Switzerland
| | - Lea Leibrock
- Roche Pharma Research and Early Development (pRED), Structural Biology, Roche Innovation Center Basel, Basel, Switzerland
| | - Can Buldun
- Roche Pharma Research and Early Development (pRED), Large Molecule Research, Roche Innovation Center Munich, Penzberg, Germany
| | - Guy Georges
- Roche Pharma Research and Early Development (pRED), Large Molecule Research, Roche Innovation Center Munich, Penzberg, Germany
| | - Ulrich Brinkmann
- Roche Pharma Research and Early Development (pRED), Large Molecule Research, Roche Innovation Center Munich, Penzberg, Germany.
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11
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Cavenaghi A, Hoffmann E, Labed P, Chiche L, Koskas F, Davaine J. WITHDRAWN: Anterior cage migration during spine surgery: an unusual and severe complication. J Vasc Surg Cases Innov Tech 2020. [DOI: 10.1016/j.jvscit.2020.03.010] [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: 10/24/2022] Open
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12
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Stamer UM, Stammschulte T, Erlenwein J, Koppert W, Freys S, Meißner W, Ahrens P, Brede EM, Lindig M, Dusch M, Heitfeld S, Hoffmann E, Lux EA, Müller E, Pauli-Magnus D, Pogatzki-Zahn E, Quaisser-Kimpfbeck C, Ringeler U, Rittner H, Ulma J, Wirz S. [Recommendations for the perioperative use of dipyrone : Expert recommendation of the working group on acute pain of the German Pain Society, the scientific working group on pain medicine of the German Society for Anesthesiology and Intensive Care Medicine and the surgical working group on acute pain of the German Society for Surgery with participation of representatives of the Drug Commission of the German Medical Association]. Chirurg 2019; 90:652-659. [PMID: 31359112 DOI: 10.1007/s00104-019-0993-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
BACKGROUND Dipyrone (metamizole) is widely used for perioperative pain management in countries where it is marketed; however, uncertainty exists concerning the safe use of this drug, specifically considering the rare adverse event of an agranulocytosis. METHODS As evidence from published studies was lacking, an expert panel developed recommendations for the perioperative use of dipyrone. After a formal, structured consensus process, the recommendations were approved by the involved medical societies. RESULTS The panel agreed that blood cell counts shall not be standard for short-term perioperative use in patients unless they are at risk for neutropenia. The medical staff shall be aware of the symptoms and course of action when agranulocytosis is suspected. Patients shall be informed about the risks and benefits of dipyrone and about potential alternatives. The expert group concluded that dipyrone has a relatively positive risk-benefit ratio compared to other nonopioid analgesics. The group strongly recommended educating patients about the symptoms of agranulocytosis if they have received dipyrone over several days and/or treatment is to be continued after discharge, because agranulocytosis can occur several days after discontinuation of metamizole. Further recommendations refer to the information of the physician taking over the patient's care after discharge and the avoidance of re-exposure in patients having previously suffered from dipyrone-induced agranulocytosis. CONCLUSION The group's recommendations shall be communicated in order to raise medical staff's and patients' awareness of the appropriate use of dipyrone in the perioperative period.
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Affiliation(s)
- U M Stamer
- Klinik für Anästhesiologie und Schmerztherapie, Universitätsklinik Bern, Inselspital, Universität Bern, Freiburgstraße, 3010, Bern, Schweiz.
| | - T Stammschulte
- Arzneimittelkommission der deutschen Ärzteschaft, Berlin, Deutschland
| | - J Erlenwein
- Klinik für Anästhesiologie, GF Schmerzmedizin, Universitätsmedizin Göttingen, Göttingen, Deutschland
| | - W Koppert
- Klinik für Anästhesiologie und Intensivmedizin, Medizinische Hochschule Hannover, Hannover, Deutschland
| | - S Freys
- Chirurgische Klinik, DIAKO Ev. Diakonie-Krankenhaus Bremen, Bremen, Deutschland
| | - W Meißner
- Klinik für Anästhesiologie und Intensivmedizin, Universitätsklinikum Jena, Jena, Deutschland
| | - P Ahrens
- Abteilung Anästhesie und operative Intensivmedizin, Aller-Weser-Klinik, Verden, Deutschland
| | - E-M Brede
- Klinik und Poliklinik für Anästhesiologie, Zentrum Interdisziplinäre Schmerzmedizin, Universitätsklinikum Würzburg, Würzburg, Deutschland
| | - M Lindig
- Klinik für Anästhesiologie und Intensivmedizin, Universitätsklinikum Schleswig-Holstein, Campus Lübeck, Universität zu Lübeck, Lübeck, Deutschland
| | - M Dusch
- Klinik für Anästhesiologie und Intensivmedizin, Medizinische Hochschule Hannover, Hannover, Deutschland
| | - S Heitfeld
- Klinik und Poliklinik für Anästhesiologie und Intensivtherapie, UniversitätsSchmerzCentrum Dresden, Dresden, Deutschland
| | - E Hoffmann
- Klinik für Anästhesie, operative Intensivmedizin, Notfall- und Schmerzmedizin, Evangelisches Krankenhaus Herne, Herne, Deutschland
| | - E A Lux
- Klinik für Schmerz- und Palliativmedizin, Katholisches Klinikum Lünen-Werne, Lünen, Deutschland
| | - E Müller
- Klinik für Anästhesiologie, Universitätsmedizin Greifswald, Greifswald, Deutschland
| | - D Pauli-Magnus
- Klinik für Anästhesie, Schmerztherapie, Intensiv- und Notfallmedizin, DRK Kliniken Berlin Westend, Berlin, Deutschland
| | - E Pogatzki-Zahn
- Klinik für Anästhesiologie, operative Intensivmedizin und Schmerztherapie, Universitätsklinikum Münster, Münster, Deutschland
| | - C Quaisser-Kimpfbeck
- Abteilung für Anästhesie und Schmerztherapie, Klinikum Freising, Freising, Deutschland
| | - U Ringeler
- Abteilung für Anästhesiologie, Palliativ‑, Intensiv- und Schmerzmedizin, Paracelsus-Klinik Golzheim, Düsseldorf, Deutschland
| | - H Rittner
- Arzneimittelkommission der deutschen Ärzteschaft, Berlin, Deutschland.,Klinik und Poliklinik für Anästhesiologie, Zentrum Interdisziplinäre Schmerzmedizin, Universitätsklinikum Würzburg, Würzburg, Deutschland
| | - J Ulma
- Klinik für Schmerzmedizin und Schmerzambulanz, Rotes Kreuz Krankenhaus Bremen, Bremen, Deutschland
| | - S Wirz
- Abteilung für Anästhesie, Interdisziplinäre Intensivmedizin, Schmerzmedizin/Palliativmedizin, Zentrum für Schmerzmedizin, Weaningzentrum, CURA-GFO Kliniken Bonn, Bad Honnef, Deutschland
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13
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Stamer UM, Stammschulte T, Erlenwein J, Koppert W, Freys S, Meißner W, Ahrens P, Brede EM, Lindig M, Dusch M, Heitfeld S, Hoffmann E, Lux EA, Müller E, Pauli-Magnus D, Pogatzki-Zahn E, Quaisser-Kimpfbeck C, Ringeler U, Rittner H, Ulma J, Wirz S. [Recommendations for the perioperative use of dipyrone : Expert recommendation of the working group on acute pain of the German Pain Society, the scientific working group on pain medicine of the German Society for Anesthesiology and Intensive Care Medicine and the surgical working group on acute pain of the German Society for Surgery with participation of representatives of the Drug Commission of the German Medical Association]. Schmerz 2019; 33:287-294. [PMID: 31342162 DOI: 10.1007/s00482-019-0389-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [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] [Indexed: 12/27/2022]
Abstract
BACKGROUND Dipyrone (metamizole) is widely used for perioperative pain management in countries where it is marketed; however, uncertainty exists concerning the safe use of this drug, specifically considering the rare adverse event of an agranulocytosis. METHODS As evidence from published studies was lacking, an expert panel developed recommendations for the perioperative use of dipyrone. After a formal, structured consensus process, the recommendations were approved by the involved medical societies. RESULTS The panel agreed that blood cell counts shall not be standard for short-term perioperative use in patients unless they are at risk for neutropenia. The medical staff shall be aware of the symptoms and course of action when agranulocytosis is suspected. Patients shall be informed about the risks and benefits of dipyrone and about potential alternatives. The expert group concluded that dipyrone has a relatively positive risk-benefit ratio compared to other nonopioid analgesics. The group strongly recommended educating patients about the symptoms of agranulocytosis if they have received dipyrone over several days and/or treatment is to be continued after discharge, because agranulocytosis can occur several days after discontinuation of metamizole. Further recommendations refer to the information of the physician taking over the patient's care after discharge and the avoidance of re-exposure in patients having previously suffered from dipyrone-induced agranulocytosis. CONCLUSION The group's recommendations shall be communicated in order to raise medical staff's and patients' awareness of the appropriate use of dipyrone in the perioperative period.
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Affiliation(s)
- U M Stamer
- Klinik für Anästhesiologie und Schmerztherapie, Universitätsklinik Bern, Inselspital, Universität Bern, Freiburgstraße, 3010, Bern, Schweiz.
| | - T Stammschulte
- Arzneimittelkommission der deutschen Ärzteschaft, Berlin, Deutschland
| | - J Erlenwein
- Klinik für Anästhesiologie, GF Schmerzmedizin, Universitätsmedizin Göttingen, Göttingen, Deutschland
| | - W Koppert
- Klinik für Anästhesiologie und Intensivmedizin, Medizinische Hochschule Hannover, Hannover, Deutschland
| | - S Freys
- Chirurgische Klinik, DIAKO Ev. Diakonie-Krankenhaus Bremen, Bremen, Deutschland
| | - W Meißner
- Klinik für Anästhesiologie und Intensivmedizin, Universitätsklinikum Jena, Jena, Deutschland
| | - P Ahrens
- Abteilung Anästhesie und operative Intensivmedizin, Aller-Weser-Klinik, Verden, Deutschland
| | - E-M Brede
- Klinik und Poliklinik für Anästhesiologie, Zentrum Interdisziplinäre Schmerzmedizin, Universitätsklinikum Würzburg, Würzburg, Deutschland
| | - M Lindig
- Klinik für Anästhesiologie und Intensivmedizin, Universitätsklinikum Schleswig-Holstein, Campus Lübeck, Universität zu Lübeck, Lübeck, Deutschland
| | - M Dusch
- Klinik für Anästhesiologie und Intensivmedizin, Medizinische Hochschule Hannover, Hannover, Deutschland
| | - S Heitfeld
- Klinik und Poliklinik für Anästhesiologie und Intensivtherapie, UniversitätsSchmerzCentrum Dresden, Dresden, Deutschland
| | - E Hoffmann
- Klinik für Anästhesie, operative Intensivmedizin, Notfall- und Schmerzmedizin, Evangelisches Krankenhaus Herne, Herne, Deutschland
| | - E A Lux
- Klinik für Schmerz- und Palliativmedizin, Katholisches Klinikum Lünen-Werne, Lünen, Deutschland
| | - E Müller
- Klinik für Anästhesiologie, Universitätsmedizin Greifswald, Greifswald, Deutschland
| | - D Pauli-Magnus
- Klinik für Anästhesie, Schmerztherapie, Intensiv- und Notfallmedizin, DRK Kliniken Berlin Westend, Berlin, Deutschland
| | - E Pogatzki-Zahn
- Klinik für Anästhesiologie, operative Intensivmedizin und Schmerztherapie, Universitätsklinikum Münster, Münster, Deutschland
| | - C Quaisser-Kimpfbeck
- Abteilung für Anästhesie und Schmerztherapie, Klinikum Freising, Freising, Deutschland
| | - U Ringeler
- Abteilung für Anästhesiologie, Palliativ‑, Intensiv- und Schmerzmedizin, Paracelsus-Klinik Golzheim, Düsseldorf, Deutschland
| | - H Rittner
- Arzneimittelkommission der deutschen Ärzteschaft, Berlin, Deutschland
- Klinik und Poliklinik für Anästhesiologie, Zentrum Interdisziplinäre Schmerzmedizin, Universitätsklinikum Würzburg, Würzburg, Deutschland
| | - J Ulma
- Klinik für Schmerzmedizin und Schmerzambulanz, Rotes Kreuz Krankenhaus Bremen, Bremen, Deutschland
| | - S Wirz
- Abteilung für Anästhesie, Interdisziplinäre Intensivmedizin, Schmerzmedizin/Palliativmedizin, Zentrum für Schmerzmedizin, Weaningzentrum, CURA-GFO Kliniken Bonn, Bad Honnef, Deutschland
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14
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Feltgen N, Mele B, Dietlein T, Erb C, Eckstein A, Hager A, Heiligenhaus A, Helbig H, Hoerauf H, Hoffmann E, Pauleikhoff D, Schittkowski M, Seitz B, Sucker C, Suffo S, Schaudig U, Tost F, Thurau S, Walter P, Koscielny J. [Management of anticoagulants in ophthalmic surgery-a survey among ophthalmic surgeons in Germany]. Ophthalmologe 2019; 115:585-591. [PMID: 29770858 DOI: 10.1007/s00347-018-0732-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
INTRODUCTION As our population ages and comorbidities rise, ophthalmic surgeons are increasingly faced with patients on anticoagulant therapy or with clotting disorders. The ophthalmic surgeon has to weigh the perioperative risk of haemorrhage when anticoagulation continues against the risk of thromboembolism caused by discontinuation or changing the patient's medication (bridging, switching, cessation). There are currently no guidelines or recommendations. METHODS A survey was sent to the DOG (German Ophthalmologic Society) divisions and associated surgical organizations to determine the status quo. A questionnaire was sent out and filled out by the different groups of specialists. RESULTS All four divisions of the DOG and four associated organizations returned completed questionnaires. Surgical interventions were listed that are carried out during anticoagulant therapy without exceptions, as well as interventions that were classified to require medical adjustment. Although the assessments varied, general consensus was achieved regarding interventions not requiring adjustments due to anticoagulants (i. e., intravitreal injection, cataract surgery, laser and corneal operations, simple muscle surgery), and those interventions requiring adjustments in medications (glaucoma operations, complex retina surgery, eye socket surgery, complex surgery of the lid). CONCLUSION Main result of this survey was the specification of serious bleeding complications which are permanent vision loss and re-operation. They could serve as endpoint parameters for essential future investigations. Nevertheless, this survey makes clear that the decision about an adjustment of anticoagulant medication in ophthalmic surgery is currently made individually and not based on established standards.
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Affiliation(s)
- N Feltgen
- Klinik für Augenheilkunde, Universitätsklinikum Göttingen, Robert-Koch-Straße 40, 37075, Göttingen, Deutschland.
| | - B Mele
- DOG Geschäftsstelle, Platenstr. 1, 80336, München, Deutschland
| | - T Dietlein
- Klinik für Augenheilkunde, Universitätsklinikum Köln, Köln, Deutschland
| | - C Erb
- Augenklinik am Wittenbergplatz, Berlin, Deutschland
| | - A Eckstein
- Klinik für Augenheilkunde, Universitätsklinikum Essen, Essen, Deutschland
| | - A Hager
- Augenarztpraxis am Elsterplatz, Berlin, Deutschland
| | | | - H Helbig
- Klinik für Augenheilkunde, Universitätsklinikum Regensburg, Regensburg, Deutschland
| | - H Hoerauf
- Klinik für Augenheilkunde, Universitätsklinikum Göttingen, Robert-Koch-Straße 40, 37075, Göttingen, Deutschland
| | - E Hoffmann
- Klinik für Augenheilkunde, Universitätsklinikum Mainz, Mainz, Deutschland
| | - D Pauleikhoff
- St. Franziskus-Hospital Münster, Münster, Deutschland
| | - M Schittkowski
- Klinik für Augenheilkunde, Universitätsklinikum Göttingen, Robert-Koch-Straße 40, 37075, Göttingen, Deutschland
| | - B Seitz
- Klinik für Augenheilkunde, Universitätsklinikum des Saarlandes UKS, Homburg/Saar, Deutschland
| | - C Sucker
- Gerinnungszentrum Berlin Dr. Sucker, Berlin, Deutschland
| | - S Suffo
- Klinik für Augenheilkunde, Universitätsklinikum des Saarlandes UKS, Homburg/Saar, Deutschland
| | - U Schaudig
- Augenklinik, Asklepios Klinik Barmbek, Hamburg, Deutschland
| | - F Tost
- Klinik für Augenheilkunde, Universitätsklinikum Greifswald, Greifswald, Deutschland
| | - S Thurau
- Klinik für Augenheilkunde, Universitätsklinikum München, LMU, München, Deutschland
| | - P Walter
- Klinik für Augenheilkunde, Universitätsklinikum Aachen, Aachen, Deutschland
| | - J Koscielny
- Gerinnungsambulanz und Hämophiliezentrum an der Charité, Berlin, Deutschland
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Abstract
BACKGROUND The HÖRSTAT study conducted in Northwest Germany yielded hearing impairment in approximately 16% of adults according to the World Health Organization (WHO) criterion. However, the robustness of extrapolations on a national level might be questioned, as the epidemiological data were collected on a regional level. METHODS Independently from HÖRSTAT, the "Hearing in Germany" study examined adult hearing in Aalen, a town located in Southwest Germany. Both cross-sectional studies were based on stratified random samples from the general population. Pure-tone average at 0.5, 1, 2, and 4 kHz (PTA4), the prevalence of hearing impairment (WHO criterion: PTA4 in the better ear >25 dB HL), and hearing aid provision were compared. Data from the Aalen study and HÖRSTAT were pooled (n = 3105) to extrapolate the prevalence and degree of hearing impairment for the years 2015, 2020, and 2025. RESULTS Both studies show very similar results for PTA4. Weighted for official population statistics, the prevalence of hearing impairment according to the WHO criterion is 16.2% among adults, affecting 11.1 million persons in Germany. Due to demographic changes, the prevalence is expected to increase in the medium term by around 1% per 5‑year period. With a similar degree of hearing loss, hearing aid provision differs from place to place. CONCLUSION Adjusted for gender and age to the European Standard Population (ESP), the prevalence of hearing impairment observed both in HÖRSTAT and the Aalen sample is considerably lower than reported for international studies. Since the analysis refers to cross-sectional data only, possible cohort effects are not considered in the prevalence projection.
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Affiliation(s)
- P von Gablenz
- Institut für Hörtechnik und Audiologie, Jade Hochschule und Exzellenzcluster "Hearing4All", Ofener Str. 16/19, 26121, Oldenburg, Deutschland.
| | | | - I Holube
- Institut für Hörtechnik und Audiologie, Jade Hochschule und Exzellenzcluster "Hearing4All", Ofener Str. 16/19, 26121, Oldenburg, Deutschland
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Schmid D, Buntz A, Hanh Phan TN, Mayer K, Hoffmann E, Thorey I, Niewöhner J, Vasters K, Sircar R, Mundigl O, Kontermann RE, Brinkmann U. Transcytosis of payloads that are non-covalently complexed to bispecific antibodies across the hCMEC/D3 blood-brain barrier model. Biol Chem 2019; 399:711-721. [PMID: 29466231 DOI: 10.1515/hsz-2017-0311] [Citation(s) in RCA: 4] [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: 12/15/2017] [Accepted: 02/08/2018] [Indexed: 01/23/2023]
Abstract
A transcellular shuttle system was generated for the delivery of non-covalently linked payloads across blood-brain barrier (BBB) endothelial cells. Transcytosis-enabling shuttles are composed of bispecific antibodies (bsAbs) that simultaneously bind transferrin receptor (TfR) and haptens such as digoxigenin or biocytinamide. Haptenylated payloads are attached to these vehicles via non-covalent hapten-antibody complexation. This enables targeting to and internalization into human BBB-derived microvascular endothelial hCMEC/D3 cells. In contrast to other shuttles, this system does not require special affinities or formats of their TfR-binding moieties for transcytosis and subsequent release. Non-covalent payload complexation to bsAb is flexible and robust, works for a multitude of payloads and enables separation of payloads from shuttles during transcytosis. Released payloads can enter the brain without connected bsAb entities, minimizing potential interference with distribution or functionality. Intracellular separation of shuttle and payload and recycling to cell surfaces may also enable recharging of the cell-bound BBB shuttle with payload for subsequent (merry-go-round) transport cycles.
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Affiliation(s)
- Daniela Schmid
- Roche Pharma Research and Early Development (pRED), Therapeutic Modalities - Large Molecule Research, Roche Innovation Center Munich, D-82377 Penzberg, Germany
| | - Annette Buntz
- Roche Pharma Research and Early Development (pRED), Therapeutic Modalities - Large Molecule Research, Roche Innovation Center Munich, D-82377 Penzberg, Germany
| | - Thi Ngoc Hanh Phan
- Roche Pharma Research and Early Development (pRED), Therapeutic Modalities - Large Molecule Research, Roche Innovation Center Munich, D-82377 Penzberg, Germany
| | - Klaus Mayer
- Roche Pharma Research and Early Development (pRED), Therapeutic Modalities - Large Molecule Research, Roche Innovation Center Munich, D-82377 Penzberg, Germany
| | - Eike Hoffmann
- Roche Pharma Research and Early Development (pRED), Therapeutic Modalities - Large Molecule Research, Roche Innovation Center Munich, D-82377 Penzberg, Germany
| | - Irmgard Thorey
- Roche Pharma Research and Early Development (pRED), Therapeutic Modalities - Large Molecule Research, Roche Innovation Center Munich, D-82377 Penzberg, Germany
| | - Jens Niewöhner
- Roche Pharma Research and Early Development (pRED), Therapeutic Modalities - Large Molecule Research, Roche Innovation Center Munich, D-82377 Penzberg, Germany
| | - Katrin Vasters
- Roche Pharma Research and Early Development (pRED), Therapeutic Modalities - Large Molecule Research, Roche Innovation Center Munich, D-82377 Penzberg, Germany
| | - Ranjan Sircar
- Roche Pharma Research and Early Development (pRED), Therapeutic Modalities - Large Molecule Research, Roche Innovation Center Munich, D-82377 Penzberg, Germany
| | - Olaf Mundigl
- Roche Pharma Research and Early Development (pRED), Therapeutic Modalities - Large Molecule Research, Roche Innovation Center Munich, D-82377 Penzberg, Germany
| | - Roland E Kontermann
- Institute of Cell Biology and Immunology, University of Stuttgart, Allmandring 31, D-70569 Stuttgart, Germany
| | - Ulrich Brinkmann
- Roche Pharma Research and Early Development (pRED), Therapeutic Modalities - Large Molecule Research, Roche Innovation Center Munich, D-82377 Penzberg, Germany
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Schroeder T, Krueger W, Hansen M, Hoffmann E, Dieterich H, Unertl K. Elimination of Meropenem by Continuous Hemo(Dia) Filtration: An in Vitro One-Compartment Model. Int J Artif Organs 2018. [DOI: 10.1177/039139889902200503] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Meropenem is a carbapenem antibiotic with a wide spectrum of activity against most gram positive and gram negative bacteria including anaerobes. Dose adjustments are necessary during continuous renal replacement therapies of acute renal failure. This in vitro study was conducted to investigate the influence of different filter materials, surface areas (AN-69 0.6 m2 and 0.9 m2, polysulfone 0.75 m2, polyamide 0.6 m2), and increasing flow rates (from 3.3 - 26.7 ml/min) on the elimination of meropenem in an in vitro continuous hemo(dia)filtration model. Meropenem was measured using HPLC with UV-detection. While the clearance increased proportionally to increasing dialysate flow rates in filters with a surface area of 0.9 m2, a peak clearance was reached in the small filters at flow rates of 10.0 ml/min (polyamide 0.6 m2) and 18.3 ml/min (AN-69 0.6 m2), when tested under the same conditions. This indicated incomplete dialysate saturation due to the diminished time available for meropenem to equilibrate with the dialysate solution. No adsorption to either of the tested membranes was detected. Dosage recommendations derived from clinical studies might be appropriate when different filter materials, but similar operational settings of the continuous replacement therapy, are applied. Reduction of the recommended dose might be necessary, when renal replacement therapies with lower flow rates and/or filters with smaller surface areas are carried out.
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Affiliation(s)
- T.H. Schroeder
- Department of Anaesthesiology, Eberhard-Karls-University Tuebingen, Tuebingen - Germany
| | - W.A. Krueger
- Department of Anaesthesiology, Eberhard-Karls-University Tuebingen, Tuebingen - Germany
| | - M. Hansen
- Department of Anaesthesiology, Eberhard-Karls-University Tuebingen, Tuebingen - Germany
| | - E. Hoffmann
- Department of Anaesthesiology, Eberhard-Karls-University Tuebingen, Tuebingen - Germany
| | - H.J. Dieterich
- Department of Anaesthesiology, Eberhard-Karls-University Tuebingen, Tuebingen - Germany
| | - K. Unertl
- Department of Anaesthesiology, Eberhard-Karls-University Tuebingen, Tuebingen - Germany
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Abstract
Linezolid is an oxazolidinone antibiotic with activity against important grampositive aerobic bacteria, including nosocomial pathogens. It is not known whether dosage adjustments are necessary in patients treated with continuous renal replacement therapies. This in vitro study was conducted to investigate the elimination of linezolid in an in vitro continuous hemo(dia)filtration model using different filter materials (polysulfone, polyacrylonitrile, polyamide), surface areas, and different modes of renal replacement therapies. Linezolid was measured using HPLC with UV-detection. No adsorption of linezolid to any of the tested membranes was detected. Recovery of linezolid in the ultrafiltrate was 98.2 ± 10.5% in the filtration mode. During dialysis, recovery was significantly less (87.6 ± 16.1%; p = 0.02). Linezolid elimination was not altered by filter size, when polysulfone filters with surface areas of 0.7 m2 and 1.3 m2 were tested. In conclusion, the dosage recommendations for linezolid are independent of the filter materials. However, the elimination is significantly higher during hemofiltration compared to dialysis.
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Affiliation(s)
- T H Schroeder
- Department of Anesthesiology and Intensive Care Medicine, Tuebingen University Hospital, Tuebingen, Germany.
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Sultan A, Lüker J, Andresen D, Kuck KH, Hoffmann E, Brachmann J, Hochadel M, Willems S, Eckardt L, Lewalter T, Senges J, Steven D. Predictors of Atrial Fibrillation Recurrence after Catheter Ablation: Data from the German Ablation Registry. Sci Rep 2017; 7:16678. [PMID: 29192223 PMCID: PMC5709464 DOI: 10.1038/s41598-017-16938-6] [Citation(s) in RCA: 96] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2017] [Accepted: 11/20/2017] [Indexed: 11/09/2022] Open
Abstract
Catheter ablation (CA) for atrial fibrillation (AF) has emerged as a widespread first or second line treatment option. However, up to 45% of patients (pts) show recurrence of AF within 12 month after CA. We present prospective multicenter registry data comparing characteristics of pts with and without recurrence of AF within the first year after CA. This study comprises all pts with complete follow-up one year after CA (1-y-FU; n = 3679). During 1y-FU in 1687 (45.9%) pts recurrence of AF occurred. The multivariate analysis revealed female sex and AF type prior to the procedure as predictors for AF recurrence. Furthermore, comorbidities such as valvular heart disease and renal failure as well as an early AF relapse were also predictors of AF recurrence during 1-y-FU. However, despite an AF recurrence rate of 45.9%, the majority of these pts (72.4%) reported a significant alleviation of clinical symptoms. In conclusion in pts with initially successful CA for AF female sex, AF type, in-hospital AF relapse and comorbidities such as renal failure and valvular heart disease are independent predictors for AF recurrence during 1-y-FU. However, the majority of pts deemed their interventions as successful with significant reduction of symptoms irrespective of AF.
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Affiliation(s)
- A Sultan
- University Heart Center Cologne, Dept. of Electrophysiology, Cologne, Germany.
| | - J Lüker
- University Heart Center Cologne, Dept. of Electrophysiology, Cologne, Germany
| | | | - K H Kuck
- Asklepios Hosp. St. Georg Hamburg, Hamburg, Germany
| | | | | | | | - S Willems
- University Heart Center Hamburg, Dept. of Electrophysiology, Hamburg, Germany
| | - L Eckardt
- University Hosp. Münster, Dept. of Electrophysiology, Münster, Germany
| | - T Lewalter
- Dept. of Medicine-Cardiology, P. Osypka Heart Center Munich, Munich, Germany
| | - J Senges
- IHF Ludwigshafen, Ludwigshafen, Germany
| | - D Steven
- University Heart Center Cologne, Dept. of Electrophysiology, Cologne, Germany
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20
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Hoffmann E. Qualifikation und Weiterbildung in der Facharztausbildung. Ophthalmologe 2017; 114:885-889. [DOI: 10.1007/s00347-017-0532-9] [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: 10/19/2022]
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21
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Kuśmierczyk-Michulec J, Krysta M, Kalinowski M, Hoffmann E, Baré J. Long-range transport of Xe-133 emissions under convective and non-convective conditions. J Environ Radioact 2017; 175-176:135-148. [PMID: 28544976 DOI: 10.1016/j.jenvrad.2017.05.005] [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] [Subscribe] [Scholar Register] [Received: 02/08/2017] [Revised: 05/08/2017] [Accepted: 05/08/2017] [Indexed: 06/07/2023]
Abstract
To investigate the transport of xenon emissions, the Provisional Technical Secretariat (PTS) operates an Atmospheric Transport Modelling (ATM) system based on the Lagrangian Particle Dispersion Model FLEXPART. The air mass trajectory ideally provides a "link" between a radionuclide release and a detection confirmed by radionuclide measurements. This paper investigates the long-range transport of Xe-133 emissions under convective and non-convective conditions, with special emphasis on evaluating the changes in the simulated activity concentration values due to the inclusion of the convective transport in the ATM simulations. For that purpose a series of 14 day forward simulations, with and without convective transport, released daily in the period from 1 January 2011 to 30 June 2013, were analysed. The release point was at the ANSTO facility in Australia. The simulated activity concentrations for the period January 2011 to February 2012 were calculated using the daily emission values provided by the ANSTO facility; outside the aforementioned period, the median daily emission value was used. In the simulations the analysed meteorological input data provided by the European Centre for Medium-Range Weather Forecasts (ECMWF) were used with the spatial resolution of 0.5°. It was found that the long-range transport of Xe-133 emissions under convective conditions, where convection was included in the ATM simulation, led to a small decrease in the activity concentration, as compared to transport without convection. In special cases related to deep convection, the opposite effect was observed. Availability of both daily emission values and measured Xe-133 activity concentration values was an opportunity to validate the simulations. Based on the paired t-test, a 95% confidence interval for the true mean difference between simulations without convective transport and measurements was constructed. It was estimated that the overall uncertainty lies between 0.08 and 0.25 mBq/m3. The uncertainty for the simulations with the convective transport included is slighted shifted to the lower values and is in the range between 0.06 and 0.20 mBq/m3.
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Affiliation(s)
- J Kuśmierczyk-Michulec
- International Data Centre, Comprehensive Nuclear-Test-Ban Treaty Organization, PO Box 1200, 1400 Vienna, Austria.
| | - M Krysta
- International Data Centre, Comprehensive Nuclear-Test-Ban Treaty Organization, PO Box 1200, 1400 Vienna, Austria
| | - M Kalinowski
- International Data Centre, Comprehensive Nuclear-Test-Ban Treaty Organization, PO Box 1200, 1400 Vienna, Austria
| | - E Hoffmann
- Australian Nuclear Science and Technology Organisation (ANSTO), Locked Bag 2001, Kirrawee DC, NSW 2232, Australia
| | - J Baré
- International Data Centre, Comprehensive Nuclear-Test-Ban Treaty Organization, PO Box 1200, 1400 Vienna, Austria
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Moser J, Hoffmann B, Andresen D, Kuck KH, Brachmann J, Eckardt L, Hoffmann E, Lewalter T, Schumacher B, Spitzer S, Hochadel M, Senges J, Willems S. P786Factors associated with acute pacemaker implantation after carvo- tricuspidal isthmus ablation - results from the German ablation registry. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx501.p786] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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23
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Moser J, Hoffmann B, Andresen D, Brachmann J, Eckardt L, Hoffmann E, Kuck KH, Lewalter T, Schumacher B, Spitzer S, Hochadel M, Senges J, Willems S. P2672Which factors are associated with acute pacemaker implantation after ablation of atrial fibrillation? Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx502.p2672] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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24
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Moser J, Hoffmann B, Andresen D, Brachmann J, Eckardt L, Hoffmann E, Kuck K, Lewalter T, Schumacher B, Spitzer S, Hochadel M, Senges J, Willems S. P783Influencing factors of in-hospital pacemaker implantation after ablation of AV-nodal reentry- and AV-reentry tachycardia: results from the German ablation registry. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx501.p783] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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25
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Hoffmann E, Streichert K, Nischan N, Seitz C, Brunner T, Schwagerus S, Hackenberger CPR, Rubini M. Stabilization of bacterially expressed erythropoietin by single site-specific introduction of short branched PEG chains at naturally occurring glycosylation sites. Mol Biosyst 2017; 12:1750-5. [PMID: 26776361 DOI: 10.1039/c5mb00857c] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The covalent attachment of polyethylene glycol (PEG) to therapeutic proteins can improve their physicochemical properties. In this work we utilized the non-natural amino acid p-azidophenylalanine (pAzF) in combination with the chemoselective Staudinger-phosphite reaction to install branched PEG chains to recombinant unglycosylated erythropoietin (EPO) at each single naturally occurring glycosylation site. PEGylation with two short 750 or 2000 Da PEG units at positions 24, 38, or 83 significantly decreased unspecific aggregation and proteolytic degradation while biological activity in vitro was preserved or even increased in comparison to full-glycosylated EPO. This site-specific bioconjugation approach permits to analyse the impact of PEGylation at single positions. These results represent an important step towards the engineering of site-specifically modified EPO variants from bacterial expression with increased therapeutic efficacy.
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Affiliation(s)
- E Hoffmann
- Department of Organic Chemistry, University of Konstanz, D-78464 Konstanz, Germany.
| | - K Streichert
- Leibniz Institute of Molecular Pharmacology, D-13125 Berlin and Humboldt Universität zu Berlin, D-12489 Berlin, Germany.
| | - N Nischan
- Leibniz Institute of Molecular Pharmacology, D-13125 Berlin and Humboldt Universität zu Berlin, D-12489 Berlin, Germany.
| | - C Seitz
- Department of Biochemical Pharmacology, University of Konstanz, D-78464 Konstanz, Germany
| | - T Brunner
- Department of Biochemical Pharmacology, University of Konstanz, D-78464 Konstanz, Germany
| | - S Schwagerus
- Leibniz Institute of Molecular Pharmacology, D-13125 Berlin and Humboldt Universität zu Berlin, D-12489 Berlin, Germany.
| | - C P R Hackenberger
- Leibniz Institute of Molecular Pharmacology, D-13125 Berlin and Humboldt Universität zu Berlin, D-12489 Berlin, Germany.
| | - M Rubini
- Department of Organic Chemistry, University of Konstanz, D-78464 Konstanz, Germany.
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26
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Hartl S, Dorwarth U, Straube F, Wankerl M, Krieg J, Bunz B, Hoffmann E. P1382Age dependent patient characteristics and outcome of 2nd and 3rd generation cryoballoon AF ablation: large center experience. Europace 2017. [DOI: 10.1093/ehjci/eux158.010] [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: 11/14/2022] Open
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27
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Abstract
Glaucoma is the second leading cause of blindness worldwide. The purpose of this paper is to give a review on the epidemiology of the disease, on the importance and the consequences of glaucoma for people regarding their daily life, their ability to work, and quality of life.
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Affiliation(s)
- I Oberacher-Velten
- Klinik und Poliklinik für Augenheilkunde, Klinikum der Universität Regensburg, Franz-Josef-Strauß-Allee 11, 93053, Regensburg, Deutschland.
| | - E Hoffmann
- Augenklinik und Poliklinik, Universitätsmedizin Mainz, Langenbeckstr. 1, 55131, Mainz, Deutschland
| | - H Helbig
- Klinik und Poliklinik für Augenheilkunde, Klinikum der Universität Regensburg, Franz-Josef-Strauß-Allee 11, 93053, Regensburg, Deutschland
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28
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Caimi G, Hoffmann E, Montana M, Incalcaterra E, Canino B, Lo Presti R. Beta-Thromboglobulin and Platelet Factor 4 in Juvenile Myocardial Infarction. Clin Appl Thromb Hemost 2016; 13:108-9. [PMID: 17164501 DOI: 10.1177/1076029606296424] [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: 11/15/2022] Open
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29
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Schmittnaegel M, Hoffmann E, Imhof-Jung S, Fischer C, Drabner G, Georges G, Klein C, Knoetgen H. A New Class of Bifunctional Major Histocompatibility Class I Antibody Fusion Molecules to Redirect CD8 T Cells. Mol Cancer Ther 2016; 15:2130-42. [PMID: 27353170 DOI: 10.1158/1535-7163.mct-16-0207] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2016] [Accepted: 06/17/2016] [Indexed: 11/16/2022]
Abstract
Bifunctional antibody fusion proteins engaging effector T cells for targeted elimination of tumor cells via CD3 binding have shown efficacy in both preclinical and clinical studies. Different from such a polyclonal T-cell recruitment, an alternative concept is to engage only antigen-specific T-cell subsets. Recruitment of specific subsets of T cells may be as potent but potentially lead to fewer side effects. Tumor-targeted peptide-MHC class I complexes (pMHCI-IgGs) bearing known antigenic peptides complexed with MHC class I molecules mark tumor cells as antigenic and utilize the physiologic way to interact with and activate T-cell receptors. If, for example, virus-specific CD8(+) T cells are addressed, the associated strong antigenicity and tight immune surveillance of the effector cells could lead to efficacious antitumor treatment in various tissues. However, peptide-MHC class I fusions are difficult to express recombinantly, especially when fused to entire antibody molecules. Consequently, current formats are largely limited to small antibody fragment fusions expressed in bacteria followed by refolding or chemical conjugation. Here, we describe a new molecular format bearing a single pMHCI complex per IgG fusion molecule characterized by enhanced stability and expression yields. This molecular format can be expressed in a full immunoglobulin format and can be designed as mono- or bivalent antibody binders. Mol Cancer Ther; 15(9); 2130-42. ©2016 AACR.
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Affiliation(s)
| | - Eike Hoffmann
- Large Molecule Research, Roche Innovation Center Munich, Munich, Germany
| | - Sabine Imhof-Jung
- Large Molecule Research, Roche Innovation Center Munich, Munich, Germany
| | - Cornelia Fischer
- Large Molecule Research, Roche Innovation Center Munich, Munich, Germany
| | - Georg Drabner
- Large Molecule Research, Roche Innovation Center Munich, Munich, Germany
| | - Guy Georges
- Large Molecule Research, Roche Innovation Center Munich, Munich, Germany
| | - Christian Klein
- Discovery Oncology, Roche Pharma Research and Early Development, Roche Innovation Center Zurich, Zurich, Switzerland
| | - Hendrik Knoetgen
- Therapeutic Modalities, Roche Pharma Research and Early Development, Roche Innovation Center Basel, Basel, Switzerland.
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Straeter A, Gramer B, Rasper M, Leber A, Rieber J, Hoffmann E, Vembar M, Rummeny E, Huber A. Vergleich der diagnostischen Aussagekraft der First Pass CT-Perfusionsbildgebung und der CT-Koronarangiografie im Hinblick auf die Beurteilung hämodynamisch relevanter Stenosen. ROFO-FORTSCHR RONTG 2016. [DOI: 10.1055/s-0036-1581359] [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: 10/22/2022]
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31
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Morkötter S, Jeon N, Rudolph D, Loitsch B, Spirkoska D, Hoffmann E, Döblinger M, Matich S, Finley JJ, Lauhon LJ, Abstreiter G, Koblmüller G. Demonstration of Confined Electron Gas and Steep-Slope Behavior in Delta-Doped GaAs-AlGaAs Core-Shell Nanowire Transistors. Nano Lett 2015; 15:3295-302. [PMID: 25923841 DOI: 10.1021/acs.nanolett.5b00518] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Strong surface and impurity scattering in III-V semiconductor-based nanowires (NW) degrade the performance of electronic devices, requiring refined concepts for controlling charge carrier conductivity. Here, we demonstrate remote Si delta (δ)-doping of radial GaAs-AlGaAs core-shell NWs that unambiguously exhibit a strongly confined electron gas with enhanced low-temperature field-effect mobilities up to 5 × 10(3) cm(2) V(-1) s(-1). The spatial separation between the high-mobility free electron gas at the NW core-shell interface and the Si dopants in the shell is directly verified by atom probe tomographic (APT) analysis, band-profile calculations, and transport characterization in advanced field-effect transistor (FET) geometries, demonstrating powerful control over the free electron gas density and conductivity. Multigated NW-FETs allow us to spatially resolve channel width- and crystal phase-dependent variations in electron gas density and mobility along single NW-FETs. Notably, dc output and transfer characteristics of these n-type depletion mode NW-FETs reveal excellent drain current saturation and record low subthreshold slopes of 70 mV/dec at on/off ratios >10(4)-10(5) at room temperature.
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Affiliation(s)
- S Morkötter
- †Walter Schottky Institut, Physik Department, and Center of Nanotechnology and Nanomaterials, Technische Universität München, Garching 85748, Germany
| | - N Jeon
- ‡Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60201, United States
| | - D Rudolph
- †Walter Schottky Institut, Physik Department, and Center of Nanotechnology and Nanomaterials, Technische Universität München, Garching 85748, Germany
| | - B Loitsch
- †Walter Schottky Institut, Physik Department, and Center of Nanotechnology and Nanomaterials, Technische Universität München, Garching 85748, Germany
| | - D Spirkoska
- †Walter Schottky Institut, Physik Department, and Center of Nanotechnology and Nanomaterials, Technische Universität München, Garching 85748, Germany
| | - E Hoffmann
- †Walter Schottky Institut, Physik Department, and Center of Nanotechnology and Nanomaterials, Technische Universität München, Garching 85748, Germany
- ∥Institute for Advanced Study, Technische Universität München, Garching 85748, Germany
| | - M Döblinger
- §Department of Chemistry, Ludwig-Maximilians-Universität München, Munich 81377, Germany
| | - S Matich
- †Walter Schottky Institut, Physik Department, and Center of Nanotechnology and Nanomaterials, Technische Universität München, Garching 85748, Germany
| | - J J Finley
- †Walter Schottky Institut, Physik Department, and Center of Nanotechnology and Nanomaterials, Technische Universität München, Garching 85748, Germany
| | - L J Lauhon
- ‡Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60201, United States
| | - G Abstreiter
- †Walter Schottky Institut, Physik Department, and Center of Nanotechnology and Nanomaterials, Technische Universität München, Garching 85748, Germany
- ∥Institute for Advanced Study, Technische Universität München, Garching 85748, Germany
| | - G Koblmüller
- †Walter Schottky Institut, Physik Department, and Center of Nanotechnology and Nanomaterials, Technische Universität München, Garching 85748, Germany
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32
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Schmittnaegel M, Levitsky V, Hoffmann E, Georges G, Mundigl O, Klein C, Knoetgen H. Committing Cytomegalovirus-Specific CD8 T Cells to Eliminate Tumor Cells by Bifunctional Major Histocompatibility Class I Antibody Fusion Molecules. Cancer Immunol Res 2015; 3:764-76. [PMID: 25691327 DOI: 10.1158/2326-6066.cir-15-0037] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2015] [Accepted: 02/07/2015] [Indexed: 11/16/2022]
Abstract
Tumor cells escape immune eradication through multiple mechanisms, including loss of antigenicity and local suppression of effector lymphocytes. To counteract these obstacles, we aimed to direct the unique cytomegalovirus (CMV)-specific immune surveillance against tumor cells. We developed a novel generation of fusion proteins composed of a tumor antigen-specific full immunoglobulin connected to a single major histocompatibility class I complex bearing a covalently linked virus-derived peptide (pMHCI-IgG). Here, we show that tumor antigen-expressing cancer cells, which are decorated with pMHCI-IgGs containing a HLA-A*0201 molecule associated with a CMV-derived peptide, are specifically eliminated through engagement of antigen-specific CD8(+) T cells isolated from peripheral blood mononuclear cell preparations of CMV-infected humans. These CD8(+) T cells act without additional expansion, preactivation, or provision of costimulatory signals. Elimination of tumor cells is induced at similar concentrations and with similar time kinetics as those seen with bispecific T-cell engagers (BiTE). However, while BiTE-like reagents indiscriminately activate T cells through binding to the T-cell receptor complex, pMHCI-IgGs selectively engage antigen-specific, constantly renewable, differentiated effector cytotoxic T lymphocytes to tumor cells, thereby representing a novel class of anticancer immunotherapeutics with potentially improved safety and efficacy profiles.
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Affiliation(s)
- Martina Schmittnaegel
- Large Molecule Research, Roche Innovation Center Penzberg, Roche Pharma Research and Early Development, Penzberg, Germany
| | - Victor Levitsky
- Discovery Oncology, Roche Innovation Center Zurich, Roche Pharma Research and Early Development, Zurich, Switzerland
| | - Eike Hoffmann
- Large Molecule Research, Roche Innovation Center Penzberg, Roche Pharma Research and Early Development, Penzberg, Germany
| | - Guy Georges
- Large Molecule Research, Roche Innovation Center Penzberg, Roche Pharma Research and Early Development, Penzberg, Germany
| | - Olaf Mundigl
- Large Molecule Research, Roche Innovation Center Penzberg, Roche Pharma Research and Early Development, Penzberg, Germany
| | - Christian Klein
- Discovery Oncology, Roche Innovation Center Zurich, Roche Pharma Research and Early Development, Zurich, Switzerland
| | - Hendrik Knoetgen
- Large Molecule Research, Roche Innovation Center Penzberg, Roche Pharma Research and Early Development, Penzberg, Germany.
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33
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Dengl S, Hoffmann E, Grote M, Wagner C, Mundigl O, Georges G, Thorey I, Stubenrauch KG, Bujotzek A, Josel HP, Dziadek S, Benz J, Brinkmann U. Hapten-directed spontaneous disulfide shuffling: a universal technology for site-directed covalent coupling of payloads to antibodies. FASEB J 2015; 29:1763-79. [PMID: 25670234 PMCID: PMC4415024 DOI: 10.1096/fj.14-263665] [Citation(s) in RCA: 13] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2014] [Accepted: 12/15/2014] [Indexed: 01/14/2023]
Abstract
Humanized hapten-binding IgGs were designed with an accessible cysteine close to their binding pockets, for specific covalent payload attachment. Individual analyses of known structures of digoxigenin (Dig)- and fluorescein (Fluo) binding antibodies and a new structure of a biotin (Biot)-binder, revealed a “universal” coupling position (52+2) in proximity to binding pockets but without contributing to hapten interactions. Payloads that carry a free thiol are positioned on the antibody and covalently linked to it via disulfides. Covalent coupling is achieved and driven toward complete (95–100%) payload occupancy by spontaneous redox shuffling between antibody and payload. Attachment at the universal position works with different haptens, antibodies, and payloads. Examples are the haptens Fluo, Dig, and Biot combined with various fluorescent or peptidic payloads. Disulfide-bonded covalent antibody-payload complexes do not dissociate in vitro and in vivo. Coupling requires the designed cysteine and matching payload thiol because payload or antibody without the Cys/thiol are not linked (<5% nonspecific coupling). Hapten-mediated positioning is necessary as hapten-thiol-payload is only coupled to antibodies that bind matching haptens. Covalent complexes are more stable in vivo than noncovalent counterparts because digoxigeninylated or biotinylated fluorescent payloads without disulfide-linkage are cleared more rapidly in mice (approximately 50% reduced 48 hour serum levels) compared with their covalently linked counterparts. The coupling technology is applicable to many haptens and hapten binding antibodies (confirmed by automated analyses of the structures of 140 additional hapten binding antibodies) and can be applied to modulate the pharmacokinetics of small compounds or peptides. It is also suitable to link payloads in a reduction-releasable manner to tumor- or tissue-targeting delivery vehicles.—Dengl, S., Hoffmann, E., Grote, M., Wagner, C., Mundigl, O., Georges, G., Thorey, I., Stubenrauch, K.-G., Bujotzek, A., Josel, H.-P., Dziadek, S., Benz, J., Brinkmann, U. Hapten-directed spontaneous disulfide shuffling: a universal technology for site-directed covalent coupling of payloads to antibodies.
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Affiliation(s)
- Stefan Dengl
- *Roche Pharma Research & Early Development, Large Molecule Research, Roche Innovation Center Penzberg, Penzberg, Germany; Roche Diagnostics GmbH, Penzberg, Germany; and Roche Discovery Technologies, Roche Innovation Center Basel, Basel, Switzerland
| | - Eike Hoffmann
- *Roche Pharma Research & Early Development, Large Molecule Research, Roche Innovation Center Penzberg, Penzberg, Germany; Roche Diagnostics GmbH, Penzberg, Germany; and Roche Discovery Technologies, Roche Innovation Center Basel, Basel, Switzerland
| | - Michael Grote
- *Roche Pharma Research & Early Development, Large Molecule Research, Roche Innovation Center Penzberg, Penzberg, Germany; Roche Diagnostics GmbH, Penzberg, Germany; and Roche Discovery Technologies, Roche Innovation Center Basel, Basel, Switzerland
| | - Cornelia Wagner
- *Roche Pharma Research & Early Development, Large Molecule Research, Roche Innovation Center Penzberg, Penzberg, Germany; Roche Diagnostics GmbH, Penzberg, Germany; and Roche Discovery Technologies, Roche Innovation Center Basel, Basel, Switzerland
| | - Olaf Mundigl
- *Roche Pharma Research & Early Development, Large Molecule Research, Roche Innovation Center Penzberg, Penzberg, Germany; Roche Diagnostics GmbH, Penzberg, Germany; and Roche Discovery Technologies, Roche Innovation Center Basel, Basel, Switzerland
| | - Guy Georges
- *Roche Pharma Research & Early Development, Large Molecule Research, Roche Innovation Center Penzberg, Penzberg, Germany; Roche Diagnostics GmbH, Penzberg, Germany; and Roche Discovery Technologies, Roche Innovation Center Basel, Basel, Switzerland
| | - Irmgard Thorey
- *Roche Pharma Research & Early Development, Large Molecule Research, Roche Innovation Center Penzberg, Penzberg, Germany; Roche Diagnostics GmbH, Penzberg, Germany; and Roche Discovery Technologies, Roche Innovation Center Basel, Basel, Switzerland
| | - Kay-Gunnar Stubenrauch
- *Roche Pharma Research & Early Development, Large Molecule Research, Roche Innovation Center Penzberg, Penzberg, Germany; Roche Diagnostics GmbH, Penzberg, Germany; and Roche Discovery Technologies, Roche Innovation Center Basel, Basel, Switzerland
| | - Alexander Bujotzek
- *Roche Pharma Research & Early Development, Large Molecule Research, Roche Innovation Center Penzberg, Penzberg, Germany; Roche Diagnostics GmbH, Penzberg, Germany; and Roche Discovery Technologies, Roche Innovation Center Basel, Basel, Switzerland
| | - Hans-Peter Josel
- *Roche Pharma Research & Early Development, Large Molecule Research, Roche Innovation Center Penzberg, Penzberg, Germany; Roche Diagnostics GmbH, Penzberg, Germany; and Roche Discovery Technologies, Roche Innovation Center Basel, Basel, Switzerland
| | - Sebastian Dziadek
- *Roche Pharma Research & Early Development, Large Molecule Research, Roche Innovation Center Penzberg, Penzberg, Germany; Roche Diagnostics GmbH, Penzberg, Germany; and Roche Discovery Technologies, Roche Innovation Center Basel, Basel, Switzerland
| | - Joerg Benz
- *Roche Pharma Research & Early Development, Large Molecule Research, Roche Innovation Center Penzberg, Penzberg, Germany; Roche Diagnostics GmbH, Penzberg, Germany; and Roche Discovery Technologies, Roche Innovation Center Basel, Basel, Switzerland
| | - Ulrich Brinkmann
- *Roche Pharma Research & Early Development, Large Molecule Research, Roche Innovation Center Penzberg, Penzberg, Germany; Roche Diagnostics GmbH, Penzberg, Germany; and Roche Discovery Technologies, Roche Innovation Center Basel, Basel, Switzerland
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Rashad A, Sadr-Eshkevari P, Heiland M, Smeets R, Prochnow N, Hoffmann E, Maurer P. Practitioner experience with sonic osteotomy compared to bur and ultrasonic saw: a pilot in vitro study. Int J Oral Maxillofac Surg 2014; 44:203-8. [PMID: 25277806 DOI: 10.1016/j.ijom.2014.09.004] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2013] [Revised: 05/07/2014] [Accepted: 09/04/2014] [Indexed: 10/24/2022]
Abstract
The aim of the present study was to compare subjective experiences using bur, ultrasonic, and sonic osteotomy systems. Ten novice (N) and 10 expert (E) practitioners performed osteotomies on bovine ribs with each system. They scored ease of handling and sense of accuracy on visual analogue scales. The duration of the osteotomy procedure and the amount of noise were recorded objectively. Learning experience was evaluated in a second run. The Mann-Whitney U-test, Wilcoxon signed rank tests, and Spearman's rank correlation coefficient were used for the statistical analyses. The sonic system was significantly slower, with the worst noise impact (92.9dB; standard deviation (SD) 7.1). However, both user groups improved significantly in the second run (N 7.9, E 7.6). There were no significant differences in handling. The sense of accuracy was evaluated to be significantly best for the sonic system (N 8.4, E 8.4), compared to the ultrasonic system (N 7.1, E 7.1; both P=0.043) and bur system (N 5.5, P=0.002; E 6.0, P=0.006). The practitioners had a promising experience with the application of the ultrasonic system and particularly with the sonic system.
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Affiliation(s)
- A Rashad
- Department of Oral and Maxillofacial Surgery, University Medical Centre Hamburg-Eppendorf, Hamburg, Germany.
| | - P Sadr-Eshkevari
- Department of Neuroanatomy and Molecular Brain Research, Ruhr-University, Bochum, Germany
| | - M Heiland
- Department of Oral and Maxillofacial Surgery, University Medical Centre Hamburg-Eppendorf, Hamburg, Germany
| | - R Smeets
- Department of Oral and Maxillofacial Surgery, University Medical Centre Hamburg-Eppendorf, Hamburg, Germany
| | - N Prochnow
- Department of Neuroanatomy and Molecular Brain Research, Ruhr-University, Bochum, Germany
| | - E Hoffmann
- Department of Neuroanatomy and Molecular Brain Research, Ruhr-University, Bochum, Germany
| | - P Maurer
- Department of Neuroanatomy and Molecular Brain Research, Ruhr-University, Bochum, Germany
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Moser J, Kuck KH, Andresen D, Spitzer SG, Hoffmann E, Schumacher B, Eckardt L, Brachmann J, Lewalter T, Hochadel M, Senges J, Willems S, Hoffmann BA. [Anticoagulation in high thromboembolic risk after catheter ablation for atrial fibrillation: results from the German Ablation Registry]. Dtsch Med Wochenschr 2014; 139:1923-8. [PMID: 25225860 DOI: 10.1055/s-0034-1387316] [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] [Indexed: 10/24/2022]
Abstract
BACKGROUND Catheter ablation (CA) for atrial fibrillation (AF) is an effective therapeutic option for the treatment of symptomatic drug-refractory AF. According to current guidelines, the prevention of stroke and embolism is the most important therapeutic goal in AF and the recommendations for anticoagulation (OAC) after successful CA are based upon the CHA2DS2-VASc-Score 3. The aim of this study was to evaluate the use of OAC in patients with a high risk for thromboembolic events 1 year after CA and to identify predictor variables for discontinuation of OAC. METHODS Between January 2007 and January 2010 13092 patients were enrolled in the study. A total of 52 German electrophysiological centers agreed to participate in this prospective multicenter registry. 41 centers included patients undergoing CA for AF. Analysis included patients who were discharged with OAC after CA and had a CHA2DS2-VASc-Score ≥ 2. A centralized 1 year follow-up (FU) was conducted via telephone. RESULTS 1300 patients fulfilled the inclusion criteria. One year after CA 51.8 % of these patients were on OAC. Factors significantly associated with discontinuation of OAC included no AF recurrence in FU (adjusted odds ratio (OR): 2.14, [95 % confidence interval (CI): 1.73-2.66], P < 0.001) and paroxysmal AF (OR: 1.53 [95 % CI: 1.29-1.81], P < 0.001). Factors associated with continuation of OAK were patient age (OR per 10 years: 0.79 [95 % CI: 0.68-0.91], P = 0.002), valvular heart disease (OR: 0.67 [95 % CI: 0.48-0.92], P = 0.013), an implanted pacemaker, defibrillator or a cardiac resynchronization therapy system (OR: 0.55 [95 % CI: 0.41-0.74], P < 0.001) and neurological events in hospital or during FU (OR: 0.40 [95 % CI: 0.18-0.88], P < 0.022). CONCLUSION Almost half of the patients with an indication for OAC are not adequately anticoagulated one year after CA for AF. Paroxysmal AF or freedom from AF is significantly associated with discontinuation of OAC.
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Affiliation(s)
- J Moser
- Klinik für Kardiologie mit Schwerpunkt Elektrophysiologie, Universitäres Herzzentrum Hamburg, Universitätsklinikum Hamburg-Eppendorf
| | - K H Kuck
- Abteilung für Kardiologie, Asklepios Klinik St. Georg, Hamburg
| | - D Andresen
- Klinik für Innere Medizin - Kardiologie, Vivantes Klinikum Am Urban, Berlin
| | | | - E Hoffmann
- Klinik für Kardiologie und Intensivmedizin , Städtische Kliniken München, Klinikum Bogenhausen, München
| | - B Schumacher
- Medizinische Klinik II, Westpfalz-Klinikum, Kaiserslautern
| | - L Eckardt
- Abteilung Rhythmologie, Department für Kardiologie und Angiologie, Universitätsklinikum Münster, Münster
| | - J Brachmann
- II. Medizinische Klinik, Regiomed Klinik, Coburg
| | - T Lewalter
- Klinik für Kardiologie und internistische Intensivmedizin, Isar Herz Zentrum, Isar Kliniken GmbH, München
| | - M Hochadel
- Institut für Herzinfarktforschung, Ludwigshafen
| | - J Senges
- Institut für Herzinfarktforschung, Ludwigshafen
| | - S Willems
- Klinik für Kardiologie mit Schwerpunkt Elektrophysiologie, Universitäres Herzzentrum Hamburg, Universitätsklinikum Hamburg-Eppendorf
| | - B A Hoffmann
- Klinik für Kardiologie mit Schwerpunkt Elektrophysiologie, Universitäres Herzzentrum Hamburg, Universitätsklinikum Hamburg-Eppendorf
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Heyn M, Hoffmann E. „Starker Wille statt Promille“ – Neue Wege in der Prävention von Alkoholmissbrauch. Gesundheitswesen 2014. [DOI: 10.1055/s-0034-1386924] [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: 10/24/2022]
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Miller RT, Miksys S, Hoffmann E, Tyndale RF. Ethanol self-administration and nicotine treatment increase brain levels of CYP2D in African green monkeys. Br J Pharmacol 2014; 171:3077-88. [PMID: 24611668 PMCID: PMC4055207 DOI: 10.1111/bph.12652] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2013] [Revised: 01/31/2014] [Accepted: 02/09/2014] [Indexed: 01/20/2023] Open
Abstract
BACKGROUND AND PURPOSE CYP2D6 metabolizes many centrally acting drugs, neurotoxins and endogenous neurochemicals, and differences in brain levels of CYP2D have been associated with brain function and drug response. Alcohol consumers and smokers have higher levels of CYP2D6 in brain, but not liver, suggesting ethanol and/or nicotine may induce human brain CYP2D6. We investigated the independent and combined effects of chronic ethanol self-administration and nicotine treatment on CYP2D expression in African green monkeys. EXPERIMENTAL APPROACH Forty monkeys were randomized into control, ethanol-only, nicotine-only and ethanol + nicotine groups. Two groups voluntarily self-administered 10% ethanol in sucrose solution for 4 h·day(-1) , whereas two groups consumed sucrose solution on the same schedule. Two groups received daily s.c. injections of 0.5 mg·kg(-1) nicotine in saline bid, whereas two groups were injected with saline on the same schedule. KEY RESULTS Both nicotine and ethanol dose-dependently increased CYP2D in brain; brain mRNA was unaffected, and neither drug altered hepatic CYP2D protein or mRNA. The combination of ethanol and nicotine increased brain CYP2D protein levels to a greater extent than either drug alone (1.2-2.2-fold, P < 0.05 among the eight brain regions assessed). Immunohistochemistry revealed the induction of brain CYP2D protein within specific cell types and regions in the treatment groups. CONCLUSIONS AND IMPLICATIONS Ethanol and nicotine increase brain CYP2D protein levels in monkeys, in a region and treatment-specific manner, suggesting that CNS drug responses, neurodegeneration and personality may be affected among people who consume alcohol and/or nicotine.
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Affiliation(s)
- R T Miller
- Campbell Family Mental Health Research Institute, Centre for Addiction and Mental Health and Departments of Psychiatry, Pharmacology and Toxicology, University of Toronto, Toronto, ON, Canada
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Ould-Slimane M, Foulongne E, Leroux J, Bertiaux S, Lenoir T, Guigui P, Hoffmann E. Sacro-iliac joint arthroscopy for arthrodesis after traumatic dislocation. Cadaver and clinical feasibility study. Orthop Traumatol Surg Res 2014; 100:159-63. [PMID: 24440546 DOI: 10.1016/j.otsr.2013.10.014] [Citation(s) in RCA: 2] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/27/2012] [Revised: 06/05/2013] [Accepted: 10/07/2013] [Indexed: 02/02/2023]
Abstract
BACKGROUND Sacro-iliac arthrodesis usually requires an extended posterior approach, which is associated with a number of dreaded complications. Here, we assessed the feasibility of arthroscopic exploration of the dislocated sacro-iliac joint. MATERIALS AND METHODS In the first step of our study, we used ligament section to induce loss of sacro-iliac joint coaptation in a cadaver. We then studied 5 patients with Tile C pelvic ring injuries. Arthroscopy was used to clear the joint of fibrous tissue and to roughen the bone to subchondral level in order to induce sacro-iliac arthrodesis. In addition, posterior fixation was performed using a hinge system or an ilio-sacral screw. RESULTS The cadaver study confirmed the feasibility of sacro-iliac arthroscopy after disruption of the strong posterior inter-osseous ligament. In the clinical part of the study in 5 patients with Tile C pelvic ring injuries, arthroscopy allowed direct visualisation extending to the anterior part of the joint space. A power burr and synovial knife were introduced to remove the interposed fibrous tissue and to roughen the bone to subchondral level in order to induce joint fusion. In addition, percutaneous or open posterior fixation was performed in all 5 patients. No infectious complications were recorded. DISCUSSION An arthroscope cannot be introduced into the normal sacro-iliac joint. In contrast, after traumatic sacro-iliac dislocation, arthroscopy can be used to evaluate the intra-articular injuries and to roughen the bone to subchondral level.
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Affiliation(s)
- M Ould-Slimane
- Service de chirurgie orthopédique, CHU de Rouen, Université de Rouen, 1, rue de Germont, 76031 Rouen cedex, France.
| | - E Foulongne
- Service de chirurgie orthopédique, CHU de Rouen, Université de Rouen, 1, rue de Germont, 76031 Rouen cedex, France
| | - J Leroux
- Service de chirurgie pédiatrique, CHU de Rouen, Université de Rouen, 1, rue de Germont, 76031 Rouen cedex, France
| | - S Bertiaux
- Service de chirurgie orthopédique, CHU de Rouen, Université de Rouen, 1, rue de Germont, 76031 Rouen cedex, France
| | - T Lenoir
- Service de chirurgie orthopédique, Hôpital Beaujon, AP-HP, Université Paris VII, 100, boulevard du Général-Leclerc, 92110 Clichy, France
| | - P Guigui
- Service de chirurgie orthopédique, Hôpital Beaujon, AP-HP, Université Paris VII, 100, boulevard du Général-Leclerc, 92110 Clichy, France
| | - E Hoffmann
- Service de chirurgie orthopédique, Hôpital Beaujon, AP-HP, Université Paris VII, 100, boulevard du Général-Leclerc, 92110 Clichy, France
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Schöppner M, Plastino W, Hermanspahn N, Hoffmann E, Kalinowski M, Orr B, Tinker R. Atmospheric transport modelling of time resolved 133Xe emissions from the isotope production facility ANSTO, Australia. J Environ Radioact 2013; 126:1-7. [PMID: 23917155 DOI: 10.1016/j.jenvrad.2013.07.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2012] [Revised: 07/02/2013] [Accepted: 07/03/2013] [Indexed: 06/02/2023]
Abstract
The verification of the Comprehensive Nuclear-Test Ban Treaty (CTBT) relies amongst other things on the continuous and worldwide monitoring of radioxenon. The characterization of the existing and legitimate background, which is produced mainly by nuclear power plants and isotope production facilities, is of high interest to improve the capabilities of the monitoring network. However, the emissions from legitimate sources can usually only be estimated. For this paper historic source terms of (133)Xe emissions from the isotope production facility at ANSTO, Sydney, Australia, have been made available in a daily resolution. Based on these high resolution data, different source term sets with weekly, monthly and yearly time resolution have been compiled. These different sets are then applied together with atmospheric transport modelling (ATM) to predict the concentration time series at two radioxenon monitoring stations. The results are compared with each other in order to examine the improvement of the prediction capability depending on the used time resolution of the most dominant source term in the region.
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Affiliation(s)
- M Schöppner
- University of Roma Tre, Department of Mathematics and Physics, Via della Vasca Navale 84, I-00146 Roma, Italy; INFN, Section of Roma Tre, Via della Vasca Navale 84, I-00146 Roma, Italy.
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Hoffmann E, Schiff-Shenhav H. The Reaction Between Bis-Trialkylammonium Phthalate and Alkyl Chloroformate. Isr J Chem 2013. [DOI: 10.1002/ijch.196300063] [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: 11/08/2022]
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Schmidt M, Dorwarth U, Andresen D, Brachmann J, Kuck KH, Kuniss M, Willems S, Senges J, Lewalter T, Hoffmann E. RF versus cryoballoon in atrial fibrillation ablation: outcome data from the German ablation registry I. Eur Heart J 2013. [DOI: 10.1093/eurheartj/eht309.3538] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Deneke T, Lewalter T, Andresen D, Becker R, Brachmann J, Eckadt L, Hoffmann E, Kuck KH, Willems S, Senges J. Ablation of sustained ventricular tachycardia in patients with and without structural heart disease. Eur Heart J 2013. [DOI: 10.1093/eurheartj/eht310.p4928] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Dorwarth U, Schmidt M, Straube F, Wankerl M, Krieg J, Hoffmann E. New cryoballoon generation enhances procedural efficacy without compromising safety. Eur Heart J 2013. [DOI: 10.1093/eurheartj/eht307.p498] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Rieber J, Rittger H, Henrichs S, Ostermeier M, Baylacher M, Schmidt M, Hoffmann E. Clinical evaluation of dynamic layer separation for coronary DSA and enhancement in fluoroscopic sequences. Eur Heart J 2013. [DOI: 10.1093/eurheartj/eht307.p265] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Fiek M, Gindele F, von Bary C, Muessig D, Lucic A, Hoffmann E, Reithmann C, Steinbeck G. Direct thermography-a new in vitro method to characterize temperature kinetics of ablation catheters. J Interv Card Electrophysiol 2013; 38:53-9. [PMID: 23851713 DOI: 10.1007/s10840-013-9815-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/12/2012] [Accepted: 05/23/2013] [Indexed: 10/26/2022]
Abstract
PURPOSE For the treatment of increasingly complex cardiac arrhythmias, new catheter designs as well as alternative energy sources are constantly being developed. However, there is presently no in vitro method available for assessment of the temperature changes induced at various myocardial levels during energy delivery. Therefore, our study was aimed at developing an in vitro model to record and display the temperature kinetics during ablation in the entire muscle cross section. METHODS AND RESULTS A sapphire glass pane was inserted into one wall of the in vitro experimental set-up. Due to its thermodynamic properties, the temperature distribution in an adjacent cross section of the cardiac muscle can be measured exactly ( 1 °C) through this pane by means of a thermography camera. Computer-supported image processing enables the colour-coded and two-dimensional display of the temperature kinetics during the energy application at any location of the myocardial cross section (± 0.5 mm). This new measuring methodology was validated by direct temperature measurements utilizing several intramyocardial thermo elements. CONCLUSION This new method allows a temporal and spatial analysis of the temperature phenomena during ablation without the interference and spatial limitation of intramyocardial temperature probes. New ablation technologies can thus be evaluated, independent of the catheter configuration or source of energy used.
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Affiliation(s)
- M Fiek
- Medical Hospital I, Klinikum Pasing, Steinerweg 5, 81241, Munich, Germany,
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Hoffmann E, Konkar A, Dziadek S, Josel HP, Conde-Knape K, Kropp H, Kling L, Stubenrauch K, Thorey I, Dengl S, Brinkmann U. PK modulation of haptenylated peptides via non-covalent antibody complexation. J Control Release 2013; 171:48-56. [PMID: 23800420 DOI: 10.1016/j.jconrel.2013.06.021] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [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: 02/26/2013] [Revised: 06/11/2013] [Accepted: 06/15/2013] [Indexed: 11/15/2022]
Abstract
We applied noncovalent complexes of digoxigenin (Dig) binding antibodies with digoxigeninylated peptide derivatives to modulate their pharmacokinetic properties. A peptide derivative which activates the Y2R receptor was selectively mono-digoxigeninylated by reacting a NHS-Dig derivative with an ε-amino group of lysine 2. This position tolerates modifications without destroying receptor binding and functionality of the peptide. Dig-peptide derivatives can be loaded onto Dig-binding IgGs in a simple and robust reaction, thereby generating peptide-IgG complexes in a defined two to one molar ratio. This indicates that each antibody arm becomes occupied by one haptenylated peptide. In vitro receptor binding and signaling assays showed that Dig-peptides as well as the peptide-antibody complexes retain better potency than the corresponding pegylated peptides. In vivo analyses revealed prolonged serum half-life of antibody-complexed peptides compared to unmodified peptides. Thus, complexes are of sufficient stability for PK modulation. We observed more prolonged weight reduction in a murine diet-induced obesity (DIO) model with antibody-complexed peptides compared to unmodified peptides. We conclude that antibody-hapten complexation can be applied to modulate the PK of haptenylated peptides and in consequence improve the therapeutic efficacy of therapeutic peptides.
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Affiliation(s)
- Eike Hoffmann
- Roche Pharma Research & Early Development pRED, Large Molecule Research, Nonnenwald 2, D-82372 Penzberg, Germany.
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Dempsey DA, Sambol NC, Jacob P, Hoffmann E, Tyndale RF, Fuentes-Afflick E, Benowitz NL. CYP2A6 genotype but not age determines cotinine half-life in infants and children. Clin Pharmacol Ther 2013; 94:400-6. [PMID: 23714690 PMCID: PMC3820275 DOI: 10.1038/clpt.2013.114] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2013] [Accepted: 05/19/2013] [Indexed: 01/08/2023]
Abstract
The formation of cotinine, the main proximate metabolite and a biomarker of nicotine exposure, is mediated primarily by cytochrome P450 (CYP)2A6. Our aim was to determine whether higher cotinine levels in young children exposed to secondhand smoke (SHS) are a result of age-related differences in pharmacokinetics. Forty-nine participants, aged 2-84 months, received oral deuterium-labeled cotinine, with daily urine samples for up to 10 days for cotinine half-life measurement. DNA from saliva was used for CYP2A6 genotyping. The estimate of half-life using a mixed-effect model was 17.9 h (95% confidence interval: 16.5, 19.3), similar to that reported in adults. There was no statistically significant effect of sex, race, age, or weight. Children with normal-activity CYP2A6*1/*1 genotypes had a shorter half-life than those with one or two reduced-activity variant alleles. Our data suggest that higher cotinine levels in SHS-exposed young children as compared with adults are due to greater SHS exposure rather than to different cotinine pharmacokinetics.
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Affiliation(s)
- D A Dempsey
- Division of Clinical Pharmacology and Experimental Therapeutics, Medical Service, San Francisco General Hospital Medical Center, San Francisco, California, USA
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Hoffmann E, Räder C, Fuhrmann H, Maurer P. Styloid–carotid artery syndrome treated surgically with Piezosurgery: A case report and literature review. J Craniomaxillofac Surg 2013; 41:162-6. [DOI: 10.1016/j.jcms.2012.07.004] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2010] [Revised: 04/11/2012] [Accepted: 07/03/2012] [Indexed: 10/28/2022] Open
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