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Rössler L, Herrmann M, Wiegand A, Kanzow P. Usage of Multiple-Choice Items in Summative Examinations: Questionnaire Survey Among German Undergraduate Dental Training Programmes. JMIR Med Educ 2024. [PMID: 38712378 DOI: 10.2196/58126] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2024]
Abstract
BACKGROUND Multiple-choice examinations are frequently employed among German dental schools. However, details regarding the used item types and applied scoring methods are lacking. OBJECTIVE We aimed to gain an insight into the current usage of multiple-choice items (ie, questions) in summative examinations in German undergraduate dental training programmes. METHODS A paper-based 10-item questionnaire regarding the employed assessment methods, multiple-choice item types, and applied scoring methods was designed. The pilot-tested questionnaire was mailed to the Deans of Studies and to the Heads of Department of Operative/Restorative Dentistry at all 30 dental schools in Germany in February 2023. Statistical analysis was performed using Fisher's exact test (P<.05). RESULTS The response rate amounted to 90.0% (27/30 dental schools). All respondent dental schools employed multiple-choice examinations for summative assessments. Examinations were delivered electronically by 70.4% (19/27) of the dental schools. Almost all dental schools used single-choice Type A items (88.9%) which accounted for the largest number of items in about half of the dental schools. Further item types (eg, conventional multiple-select items, Multiple-True-False, Pick-N) were only used by fewer dental schools (≤66.7%, up to 18 out of 27 dental schools). For the multiple-select item types, the applied scoring methods varied considerably (ie, awarding [intermediate] partial credit, requirements for partial credit). Dental schools with the possibility of electronic examinations used multiple-select items slightly more often (73.7%, 14/19 vs. 50.0%, 4/8). However, this difference was statistically not significant (P=.375). Dental schools used items either individually or as key feature problems consisting of a clinical case scenario followed by a number of items focusing on critical treatment steps (55.6%, 15/27). Not a single school employed alternative testing methods (eg, answer-until-correct). A formal item review process was established at about half of the dental schools (55.6%, 15/27). CONCLUSIONS Summative assessment methods among German dental schools vary widely. Especially, a large variability regarding the use and scoring of multiple-select multiple-choice items was found. CLINICALTRIAL
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Affiliation(s)
- Lena Rössler
- Department of Preventive Dentistry, Periodontology and Cariology, University Medical Center Göttingen, Robert-Koch-Str 40, Göttingen, DE
| | - Manfred Herrmann
- Study Deanery, University Medical Center Göttingen, Göttingen, DE
| | - Annette Wiegand
- Department of Preventive Dentistry, Periodontology and Cariology, University Medical Center Göttingen, Robert-Koch-Str 40, Göttingen, DE
| | - Philipp Kanzow
- Department of Preventive Dentistry, Periodontology and Cariology, University Medical Center Göttingen, Robert-Koch-Str 40, Göttingen, DE
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Zittermann A, Zelzer S, Herrmann M, Gummert JF, Kleber M, Trummer C, Theiler-Schwetz V, Keppel MH, Maerz W, Pilz S. Determinants of circulating calcitriol in cardiovascular disease. J Steroid Biochem Mol Biol 2024; 241:106528. [PMID: 38677380 DOI: 10.1016/j.jsbmb.2024.106528] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/05/2024] [Revised: 03/28/2024] [Accepted: 04/23/2024] [Indexed: 04/29/2024]
Abstract
Circulating calcitriol may contribute to the risk of cardiovascular disease (CVD), but its regulation in patients with CVD is poorly characterized. We therefore aimed to assess determinants of circulating calcitriol in these patients. We analyzed 2183 independent samples from a large cohort of patients scheduled for coronary angiography and 1727 independent samples from different other cohorts from patients with a wide range of CVDs, including heart transplant candidates, to quantify the association of different parameters with circulating calcitriol. We performed univariable and multivariable linear regression analyses using the mathematical function that fitted best with circulating calcitriol. In the multivariable analysis of the large single cohort, nine parameters remained significant, explaining 30.0 % (32.4 % after exclusion of 22 potential outliers) of the variation in circulating calcitriol (r=0.548). Log-transformed 25-hydroxyvitamin D [25(OH)D] and log-transformed glomerular filtration rate were the strongest predictors, explaining 17.6 % and 6.6 %, respectively, of the variation in calcitriol. In the analysis of the combined other cohorts, including heart transplant candidates, the multivariable model explained a total of 42.6 % (46.1 % after exclusion of 21 potential outliers) of the variation in calcitriol (r=0.653) with log-transformed fibroblast growth factor-23 and log-transformed 25(OH)D explaining 29.0 % and 6.2 %, respectively. Circulating 25(OH)D was positively and FGF-23 inversely associated with circulating calcitriol. Although significant, PTH was only a weak predictor of calcitriol in both analyses (<2.5 %). In patients with CVD, FGF-23 and 25(OH)D are important independent determinants of circulating calcitriol. The relative importance of these two parameters may vary according to CVD severity. Future studies should focus on the clinical importance of regulating circulating calcitriol by different parameters.
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Affiliation(s)
- A Zittermann
- Clinic for Thoracic and Cardiovascular Surgery, Herz, und Diabeteszentrum NRW, Ruhr-University Bochum, Bad Oeynhausen, 32545, Germany.
| | - S Zelzer
- Clinical Institute of Medical and Chemical Laboratory Diagnostics, Medical University of Graz, Graz 8036, Austria
| | - M Herrmann
- Clinical Institute of Medical and Chemical Laboratory Diagnostics, Medical University of Graz, Graz 8036, Austria
| | - J F Gummert
- Clinic for Thoracic and Cardiovascular Surgery, Herz, und Diabeteszentrum NRW, Ruhr-University Bochum, Bad Oeynhausen, 32545, Germany
| | - M Kleber
- Vth Department of Medicine (Nephrology, Hypertensiology, Rheumatology, Endocrinology, Diabetology, Lipidology), Medical Faculty Mannheim, University of Heidelberg, Mannheim 68167, Germany; SYNLAB MVZ Humangenetik Mannheim, Mannheim 68163, Germany
| | - C Trummer
- Division of Endocrinology and Diabetology, Department of Internal Medicine, Medical University of Graz, Graz 8036, Austria
| | - V Theiler-Schwetz
- Division of Endocrinology and Diabetology, Department of Internal Medicine, Medical University of Graz, Graz 8036, Austria
| | - M H Keppel
- Clinical Institute of Medical and Chemical Laboratory Diagnostics, Medical University of Graz, Graz 8036, Austria
| | - W Maerz
- Vth Department of Medicine (Nephrology, Hypertensiology, Rheumatology, Endocrinology, Diabetology, Lipidology), Medical Faculty Mannheim, University of Heidelberg, Mannheim 68167, Germany; SYNLAB MVZ Humangenetik Mannheim, Mannheim 68163, Germany; SYNLAB Holding, Deutschland GmbH, Mannheim, Augsburg 68159, Germany
| | - S Pilz
- Division of Endocrinology and Diabetology, Department of Internal Medicine, Medical University of Graz, Graz 8036, Austria
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Kanzow P, Schmidt D, Herrmann M, Wassmann T, Wiegand A, Raupach T. Use of Multiple-Select Multiple-Choice Items in a Dental Undergraduate Curriculum: Retrospective Study Involving the Application of Different Scoring Methods. JMIR Med Educ 2023; 9:e43792. [PMID: 36841970 PMCID: PMC10131704 DOI: 10.2196/43792] [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] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Revised: 12/06/2022] [Accepted: 02/25/2023] [Indexed: 06/18/2023]
Abstract
BACKGROUND Scoring and awarding credit are more complex for multiple-select items than for single-choice items. Forty-one different scoring methods were retrospectively applied to 2 multiple-select multiple-choice item types (Pick-N and Multiple-True-False [MTF]) from existing examination data. OBJECTIVE This study aimed to calculate and compare the mean scores for both item types by applying different scoring methods, and to investigate the effect of item quality on mean raw scores and the likelihood of resulting scores at or above the pass level (≥0.6). METHODS Items and responses from examinees (ie, marking events) were retrieved from previous examinations. Different scoring methods were retrospectively applied to the existing examination data to calculate corresponding examination scores. In addition, item quality was assessed using a validated checklist. Statistical analysis was performed using the Kruskal-Wallis test, Wilcoxon rank-sum test, and multiple logistic regression analysis (P<.05). RESULTS We analyzed 1931 marking events of 48 Pick-N items and 828 marking events of 18 MTF items. For both item types, scoring results widely differed between scoring methods (minimum: 0.02, maximum: 0.98; P<.001). Both the use of an inappropriate item type (34 items) and the presence of cues (30 items) impacted the scoring results. Inappropriately used Pick-N items resulted in lower mean raw scores (0.88 vs 0.93; P<.001), while inappropriately used MTF items resulted in higher mean raw scores (0.88 vs 0.85; P=.001). Mean raw scores were higher for MTF items with cues than for those without cues (0.91 vs 0.8; P<.001), while mean raw scores for Pick-N items with and without cues did not differ (0.89 vs 0.90; P=.09). Item quality also impacted the likelihood of resulting scores at or above the pass level (odds ratio ≤6.977). CONCLUSIONS Educators should pay attention when using multiple-select multiple-choice items and select the most appropriate item type. Different item types, different scoring methods, and presence of cues are likely to impact examinees' scores and overall examination results.
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Affiliation(s)
- Philipp Kanzow
- Department of Preventive Dentistry, Periodontology and Cariology, University Medical Center Göttingen, Göttingen, Germany
| | - Dennis Schmidt
- Department of Preventive Dentistry, Periodontology and Cariology, University Medical Center Göttingen, Göttingen, Germany
| | - Manfred Herrmann
- Division of Medical Education Research and Curriculum Development, Study Deanery of University Medical Center Göttingen, Göttingen, Germany
| | - Torsten Wassmann
- Department of Prosthodontics, University Medical Center Göttingen, Göttingen, Germany
| | - Annette Wiegand
- Department of Preventive Dentistry, Periodontology and Cariology, University Medical Center Göttingen, Göttingen, Germany
| | - Tobias Raupach
- Division of Medical Education Research and Curriculum Development, Study Deanery of University Medical Center Göttingen, Göttingen, Germany
- Department of Cardiology and Pneumology, University Medical Center Göttingen, Göttingen, Germany
- Institute for Medical Education, University Hospital Bonn, Bonn, Germany
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Abstract
Recent research activities have provided new insights in vitamin D metabolism in various conditions. Furthermore, substantial progress has been made in the analysis of vitamin D metabolites and related biomarkers, such as vitamin D binding protein. Liquid chromatography tandem mass spectrometric (LC-MS/MS) methods are capable of accurately measuring multiple vitamin D metabolites in parallel. Nevertheless, only 25(OH)D and the biologically active form 1,25(OH)2D are routinely measured in clinical practice. While 25(OH)D remains the analyte of choice for the diagnosis of vitamin D deficiency, 1,25(OH)2D is only recommended in a few conditions with a dysregulated D metabolism. 24,25(OH)2D, free and bioavailable 25(OH)D, and the vitamin D metabolite ratio (VMR) have shown promising results, but technical pitfalls in their quantification, limited clinical data and the lack of reference values, impede their use in clinical practice. LC-MS/MS is the preferred method for the measurement of all vitamin D related analytes as it offers high sensitivity and specificity. In particular, 25(OH)D and 24,25(OH)2D can accurately be measured with this technology. When interpreted together, they seem to provide a functional measure of vitamin D metabolism beyond the analysis of 25(OH)D alone. The determination of VDBP, free and bioavailable 25(OH)D is compromised by unresolved analytical issues, lacking reference intervals and insufficient clinical data. Therefore, future research activities should focus on analytical standardization and exploration of their clinical value. This review provides an overview on established and new vitamin D related biomarkers including their pathophysiological role, preanalytical and analytical aspects, expected values, indications and influencing conditions.
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Affiliation(s)
- N Alonso
- Clinical Institute of Medical and Chemical Laboratory Diagnostics, Medical University of Graz, Graz, Austria
| | - S Zelzer
- Clinical Institute of Medical and Chemical Laboratory Diagnostics, Medical University of Graz, Graz, Austria
| | - G Eibinger
- Clinical Institute of Medical and Chemical Laboratory Diagnostics, Medical University of Graz, Graz, Austria
| | - M Herrmann
- Clinical Institute of Medical and Chemical Laboratory Diagnostics, Medical University of Graz, Graz, Austria.
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Haeusner S, Jauković A, Kupczyk E, Herrmann M. Review: cellularity in bone marrow autografts for bone and fracture healing. Am J Physiol Cell Physiol 2023; 324:C517-C531. [PMID: 36622067 DOI: 10.1152/ajpcell.00482.2022] [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] [Indexed: 01/10/2023]
Abstract
The use of autografts, as primary cell and tissue source, is the current gold standard approach to treat critical size bone defects and nonunion defects. The unique mixture of the autografts, containing bony compartments and bone marrow (BM), delivers promising results. Although BM mesenchymal stromal cells (BM-MSCs) still represent a major target for various healing approaches in current preclinical research and respective clinical trials, their occurrence in the human BM is typically low. In vitro expansion of this cell type is regulatory challenging as well as time and cost intensive. Compared with marginal percentages of resident BM-MSCs in BM, BM mononuclear cells (BM-MNCs) contained in BM aspirates, concentrates, and bone autografts represent a readily available abundant cell source, applicable within hours during surgical procedures without the need for time-consuming and regulatory challenging cell expansion. This benefit is one reason why autografting has become a clinical standard procedure. However, the exact anatomy and cellularity of BM-MNCs in humans, which is strongly correlated to their unique mode of action and wide application range remains to be elucidated. The aim of this review was to present an overview of the current knowledge on these specific cell types found in human BM, emphasize the contribution of BM-MNCs in bone healing, highlight donor site dependence, and discuss limitations in the current isolation and subsequent characterization procedures. Hereby, the most recent and relevant examples of human BM-MNC cell characterization, flow cytometric analyses, and findings are summarized, with a strong focus on bone therapy.
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Affiliation(s)
- S Haeusner
- IZKF Group Tissue Regeneration in Musculoskeletal Diseases, University Hospital of Wuerzburg, Wuerzburg, Germany.,Bernhard-Heine-Center for Locomotion Research, University of Wuerzburg, Wuerzburg, Germany
| | - A Jauković
- Group for Hematology and Stem Cells, Institute for Medical Research, University of Belgrade, Belgrade, Serbia
| | - E Kupczyk
- Department of Trauma, Hand, Plastic and Reconstructive Surgery, University Hospital of Wuerzburg, Wuerzburg, Germany
| | - M Herrmann
- IZKF Group Tissue Regeneration in Musculoskeletal Diseases, University Hospital of Wuerzburg, Wuerzburg, Germany.,Bernhard-Heine-Center for Locomotion Research, University of Wuerzburg, Wuerzburg, Germany
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Abstract
Vitamin K, a cofactor for the γ-glutamyl carboxylase enzyme, is required for the post-translational activation of osteocalcin and matrix Gla protein, which play a key role in bone and muscle homeostasis. In vivo and in vitro models for osteoporosis and sarcopenia suggest the vitamin K could exert a positive effect in both conditions. In bone, it increases osteoblastogenesis, whilst decreases osteoclast formation and function. In muscle, it is associated with increased satellite cell proliferation and migration and might play a role in energy metabolism. Observational trials suggest that high levels of vitamin K are associated with increased bone mineral density and reduced fracture risk. However, interventional studies for vitamin K supplementation yielded conflicting results. Clinical trials in sarcopenia suggest that vitamin K supplementation could improve muscle mass and function. One of the main limitations on the vitamin K studies are the technical challenges to measure its levels in serum. Thus, they are obtained from indirect sources like food questionnaires, or levels of undercarboxylated proteins, which can be affected by other environmental or biological processes. Although current research appoints to a beneficial effect of vitamin K in bone and muscle, further studies overcoming the current limitations are required in order to incorporate this supplementation in the clinical management of patients with osteosarcopenia.
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Affiliation(s)
- N Alonso
- Clinical Institute of Medical and Chemical Laboratory Diagnostics, Medical University of Graz, Graz, Austria
| | - A Meinitzer
- Clinical Institute of Medical and Chemical Laboratory Diagnostics, Medical University of Graz, Graz, Austria
| | - E Fritz-Petrin
- Clinical Institute of Medical and Chemical Laboratory Diagnostics, Medical University of Graz, Graz, Austria
| | - D Enko
- Clinical Institute of Medical and Chemical Laboratory Diagnostics, Medical University of Graz, Graz, Austria
| | - M Herrmann
- Clinical Institute of Medical and Chemical Laboratory Diagnostics, Medical University of Graz, Graz, Austria.
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Trivanovic D, Harder J, Leucht M, Kreuzahler T, Schlierf B, Holzapfel BM, Rudert M, Jakob F, Herrmann M. Immune and stem cell compartments of acetabular and femoral bone marrow in hip osteoarthritis patients. Osteoarthritis Cartilage 2022; 30:1116-1129. [PMID: 35569800 DOI: 10.1016/j.joca.2022.05.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Revised: 03/22/2022] [Accepted: 05/02/2022] [Indexed: 02/02/2023]
Abstract
OBJECTIVE Hip osteoarthritis (OA) affects all components of the osteochondral unit, leading to bone marrow (BM) lesions, and unknown consequences on BM cell functionality. We analyzed the cellular composition in OA-affected acetabula compared to proximal femur shafts obtained of hip OA patients to reveal yet not explored immune and stem cell compartments. DESIGN Combining flow cytometry, cellular assays and transcription analyses, we performed extensive ex vivo phenotyping of acetabular BM cells from 18 hip OA patients, comparing them with their counterparts from patient-matched femoral shaft BM samples. Findings were related to differences in skeletal sites and age. RESULTS Acetabular BM had a greater frequency of T-lymphocytes, non-hematopoietic cells and colony-forming units fibroblastic potential than femoral BM. The incidence of acetabular CD45+CD3+ T-lymphocytes increased (95% CI: 0.1770 to 0.0.8416), while clonogenic hematopoietic progenitors declined (95% CI: -0.9023 to -0.2399) with age of patients. On the other side, in femoral BM, we observed higher B-lymphocyte, myeloid and erythroid cell frequencies. Acetabular mesenchymal stromal cells (MSCs) showed a senescent profile associated with the expression of survival and inflammation-related genes. Efficient osteogenic and chondrogenic differentiation was detected in acetabular MSCs, while adipogenesis was more pronounced in their femoral counterparts. CONCLUSION Our results suggest that distinctions in BM cellular compartments and MSCs may be due to the influence of the OA-stressed microenvironment, but also acetabular vs femoral shaft-specific peculiarities cannot be excluded. These results bring new knowledge on acetabular BM cell populations and may be addressed as novel pathogenic mechanisms and therapeutic targets in OA.
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Affiliation(s)
- D Trivanovic
- IZKF Group Tissue Regeneration in Musculoskeletal Diseases, University Hospital Wuerzburg, Wuerzburg, Bavaria, 97070, Germany; Bernhard-Heine-Center for Locomotion Research, University Wuerzburg, Wuerzburg, Bavaria, 97070, Germany
| | - J Harder
- Bernhard-Heine-Center for Locomotion Research, University Wuerzburg, Wuerzburg, Bavaria, 97070, Germany
| | - M Leucht
- Bernhard-Heine-Center for Locomotion Research, University Wuerzburg, Wuerzburg, Bavaria, 97070, Germany
| | - T Kreuzahler
- IZKF Group Tissue Regeneration in Musculoskeletal Diseases, University Hospital Wuerzburg, Wuerzburg, Bavaria, 97070, Germany; Bernhard-Heine-Center for Locomotion Research, University Wuerzburg, Wuerzburg, Bavaria, 97070, Germany
| | - B Schlierf
- IZKF Group Tissue Regeneration in Musculoskeletal Diseases, University Hospital Wuerzburg, Wuerzburg, Bavaria, 97070, Germany; Bernhard-Heine-Center for Locomotion Research, University Wuerzburg, Wuerzburg, Bavaria, 97070, Germany
| | - B M Holzapfel
- Bernhard-Heine-Center for Locomotion Research, University Wuerzburg, Wuerzburg, Bavaria, 97070, Germany; Department of Orthopaedic Surgery, König-Ludwig-Haus, University of Wuerzburg, Wuerzburg, Bavaria, 97070, Germany; Department of Orthopaedic Surgery, University Clinics, Ludwig-Maximilians University Munich, Munich, 81377, Germany
| | - M Rudert
- Bernhard-Heine-Center for Locomotion Research, University Wuerzburg, Wuerzburg, Bavaria, 97070, Germany; Department of Orthopaedic Surgery, König-Ludwig-Haus, University of Wuerzburg, Wuerzburg, Bavaria, 97070, Germany
| | - F Jakob
- Bernhard-Heine-Center for Locomotion Research, University Wuerzburg, Wuerzburg, Bavaria, 97070, Germany
| | - M Herrmann
- IZKF Group Tissue Regeneration in Musculoskeletal Diseases, University Hospital Wuerzburg, Wuerzburg, Bavaria, 97070, Germany; Bernhard-Heine-Center for Locomotion Research, University Wuerzburg, Wuerzburg, Bavaria, 97070, Germany.
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Trivanovic D, Horas K, Schlierf B, Rudert M, Herrmann M. P1414: MARROW ADIPOCYTE-ENRICHED NICHE HOSTS AND INFLUENCES A FRACTION OF HEMATOPOIETIC PROGENITORS IN ADULT HIP BONE. Hemasphere 2022. [PMCID: PMC9430597 DOI: 10.1097/01.hs9.0000848516.33377.2e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022] Open
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Hildebrand M, Herrmann M, Gieling F, Gehweiler D, Mischler D, Verrier S, Alini M, Zeiter S, Thompson K. Development and characterization of a predictive microCT-based non-union model in Fischer F344 rats. Arch Orthop Trauma Surg 2022; 142:579-590. [PMID: 33174612 DOI: 10.1007/s00402-020-03680-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [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: 06/21/2020] [Accepted: 10/28/2020] [Indexed: 11/24/2022]
Abstract
INTRODUCTION Non-unions remain a clinical problem and are characterised by the failure to heal after a defined period of time. Current preclinical non-union models apply a wide variety of techniques to diminish intrinsic healing potential deviating from the clinical situation. The aim of this study was to develop and characterise a non-union model in rats using internal plate fixation without the need for additional healing insults, whereby bone healing can be longitudinally assessed using microCT. It was hypothesized that healing/non-unions can be accurately predicted at early time points by microCT. MATERIALS AND METHODS Female, skeletally mature Fischer F344 rats received a 2 mm or 1 mm femoral osteotomy, stabilized with either a 2 mm thick plate or a 1.25 mm thick plate. Healing was monitored by microCT over 14 weeks and histological analysis at euthanasia. The mechanical environment was characterised using finite element (FE) modelling and biomechanical testing. RESULTS The majority of animals receiving the 2 mm thick plate displayed poor healing responses in both the 2 mm and 1 mm defect size groups. Bone and cartilage formation were markedly improved using the 1.25 mm thick plate. MicroCT could accurately predict bone forming capacity at early time points (3-4 weeks). CONCLUSIONS The 2 mm thick plating system confers poor healing responses in female Fischer F344 rats, comparable to atrophic non-unions. By reducing plate thickness to increase interfragmentary strain within the defect site healing is improved, leading to borderline healing situations or increased abundance of cartilage tissue present in the defect site with ultimate failure to bridge the defect (hypertrophic non-union). Furthermore, microCT can reliably identify delayed/non-healing animals within 4 weeks, thereby allowing their selective targeting for the testing of novel, clinically relevant treatment strategies in different clinical situations aimed at restoring impaired bone healing.
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Affiliation(s)
- M Hildebrand
- AO Research Institute Davos, Clavadelerstrasse 8, 7270, Davos-Platz, Switzerland
| | - M Herrmann
- AO Research Institute Davos, Clavadelerstrasse 8, 7270, Davos-Platz, Switzerland.,IZKF Research Group Tissue Regeneration in Musculoskeletal Diseases, University Hospital Würzburg and Orthopedic Center for Musculoskeletal Research, University of Würzburg, Würzburg, Germany
| | - F Gieling
- AO Research Institute Davos, Clavadelerstrasse 8, 7270, Davos-Platz, Switzerland
| | - D Gehweiler
- AO Research Institute Davos, Clavadelerstrasse 8, 7270, Davos-Platz, Switzerland
| | - D Mischler
- AO Research Institute Davos, Clavadelerstrasse 8, 7270, Davos-Platz, Switzerland
| | - S Verrier
- AO Research Institute Davos, Clavadelerstrasse 8, 7270, Davos-Platz, Switzerland
| | - M Alini
- AO Research Institute Davos, Clavadelerstrasse 8, 7270, Davos-Platz, Switzerland
| | - S Zeiter
- AO Research Institute Davos, Clavadelerstrasse 8, 7270, Davos-Platz, Switzerland
| | - K Thompson
- AO Research Institute Davos, Clavadelerstrasse 8, 7270, Davos-Platz, Switzerland.
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Meusel M, Herrmann M, Machleidt F, Franzen K, Vonthein R, Sayk F. Intranasal oxytocin has sympathoexcitatory effects on vascular tone in healthy males. Am J Physiol Regul Integr Comp Physiol 2020; 320:R162-R172. [PMID: 33296278 DOI: 10.1152/ajpregu.00062.2020] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Oxytocin appears to be involved in the neuroendocrine regulation of sympathetic blood pressure (BP) homeostasis. In animals, intracerebral administration of oxytocin induces BP-relevant sympathetic activation. In humans, central nervous effects of oxytocin on BP regulation remain unclear. Intranasal administration supposedly delivers oligopeptides such as oxytocin directly to the brain. We investigated the effects of intranasal oxytocin on sympathetic vascular baroreflex function in humans using microneurographic techniques. In a balanced, double-blind crossover design, oxytocin or placebo was administered intranasally to 12 lean, healthy males (age 25 ± 4 yr). Muscle sympathetic nerve activity (MSNA) was assessed microneurographically before (presubstance), 30-45 min (postsubstance I), and 105-120 min (postsubstance II) after oxytocin administration. Baroreflex was challenged via graded infusions of vasoactive drugs, and correlation of BP with MSNA and heart rate (HR) defined baroreflex function. Experiments were conducted in the afternoon after a 5-h fasting period. After oxytocin, resting MSNA (burst rate and total activity) showed significant net increases from pre to postsubstance II compared with placebo [Δincrease = +4.3 ± 1.2 (oxytocin) vs. +2.2 ± 1.4 bursts/min (placebo), ANOVA; P < 0.05; total activity = 184 ± 11.5% (oxytocin) vs. 121 ± 14.3% (placebo), ANOVA; P = 0.01). This was combined with a small but significant net increase in resting diastolic BP, whereas systolic and mean arterial BP or HR as well as baroreflex sensitivity at vasoactive drug challenge were not altered. Intranasally administered oxytocin induced vasoconstrictory sympathoactivation in healthy male humans. The concomitant increase of diastolic BP was most likely attributable to increased vascular tone. This suggests oxytocin-mediated upward resetting of the vascular baroreflex set point at centers superordinate to the mere baroreflex-feedback loop.
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Affiliation(s)
- M Meusel
- Department of Internal Medicine II, University Heart Center Luebeck, University Hospital Schleswig-Holstein, Luebeck, Germany
| | - M Herrmann
- Department of Internal Medicine II, University Heart Center Luebeck, University Hospital Schleswig-Holstein, Luebeck, Germany
| | - F Machleidt
- Department of Internal Medicine I, University Hospital of Schleswig-Holstein, Luebeck, Germany
| | - K Franzen
- Department of Internal Medicine III, University Hospital of Schleswig-Holstein, Luebeck, Germany
| | - R Vonthein
- Institute for Medical Biometry and Statistics, University of Luebeck, Luebeck, Germany
| | - F Sayk
- Department of Internal Medicine I, University Hospital of Schleswig-Holstein, Luebeck, Germany
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Trost S, Dieterle J, Herrmann M, Signerski-Krieger J. [Video presentations for examination questions in psychiatry : A pilot study]. Nervenarzt 2020; 91:635-641. [PMID: 31468093 DOI: 10.1007/s00115-019-00794-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
BACKGROUND The master plan for medical studies 2020 (MM2020) aims at a restructuring of medical education. The examinations should represent the key element of the evaluation and electronically supported examination methods will be expanded. OBJECTIVE Videos of actors displaying psychopathological phenomena were implemented into examination questions for the first time through the use of an electronically supported examination (e-examination) and therefore in accordance with the aims of MM2020. METHODS A total of four multiple choice (MC) questions referencing short video representations of different psychopathological phenomena were formulated and shown to medical students within an e‑examination. The MC questions were evaluated with respect to scientific quality criteria and the medical students were asked to fill in a questionnaire regarding their evaluation of the content and format of the MC questions after participating in the examination. RESULTS The MC video questions were presented to the students directly following the regular e‑examination of the teaching module in psychiatry. Out of 69 students 60 participated in the study. The MC video questions had a high level of acceptance and positive evaluation by the students. With respect to the scientific quality criteria, the MC questions showed heterogeneous results. CONCLUSION Due to the versatile applicability and high efficiency, MC questions will continue to play an important role in medical examinations. In accordance with the aims of MM2020, it could be shown that psychiatric knowledge can be examined in a competence-oriented manner and with a practical orientation by means of video presentations in an e‑examination. A broader application of video presentations could complement electronically supported examinations in the discipline of psychiatry.
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Affiliation(s)
- Sarah Trost
- Klinik für Psychiatrie und Psychotherapie, Universitätsmedizin Göttingen, Georg-August-Universität, Von-Siebold-Str. 5, 37075, Göttingen, Deutschland.
| | - Julian Dieterle
- Klinik für Psychiatrie und Psychotherapie, Universitätsmedizin Göttingen, Georg-August-Universität, Von-Siebold-Str. 5, 37075, Göttingen, Deutschland.,Maßregelvollzugszentrum Niedersachsen, Moringen, Deutschland
| | - Manfred Herrmann
- Studiendekanat - Medizindidaktik und Ausbildungsforschung, Universitätsmedizin Göttingen, Georg-August-Universität, Göttingen, Deutschland
| | - Jörg Signerski-Krieger
- Klinik für Psychiatrie und Psychotherapie, Universitätsmedizin Göttingen, Georg-August-Universität, Von-Siebold-Str. 5, 37075, Göttingen, Deutschland.,Kompetenzzentrum für seelische Gesundheit, Psychiatrie und Psychotherapie im St. Josef-Hospital, Katholisches Klinikum Oberhausen, Oberhausen, Deutschland.,LVR-Klinikum Essen, Kliniken und Institut der Universität Duisburg-Essen, Essen, Deutschland
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Azizov V, Sokolova MV, Sarter K, Temchura V, Steffen (Née Harre) U, Herrmann M, Schett G, Zaiss M. OP0239 WHY DOES ALCOHOL INHIBIT ARTHRITIS? - AN EXPLANATION OF THE MECHANISM OF ARTHRITIS INHIBITION BY ETHANOL. Ann Rheum Dis 2020. [DOI: 10.1136/annrheumdis-2020-eular.4116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
Background:Alcohol consumption has emerged as consistent protective factor for the development of autoimmune diseases such as rheumatoid arthritis (RA). The underlying mechanism for this tolerance-inducing effect of alcohol, however, is unknown.Objectives:To understand the anti-arthritogenic effect of alcoholMethods:The immune-regulatory properties of alcohol consumption in vivo were tested in the collagen-induced arthritis (CIA) and serum-induced arthritis (SIA) model as well as after immunization with T cell- dependent (NP-CGG) and independent (TNP-FICOLL) antigens. Additional experiments in vivo experiments in these models were done with acetate- the metabolite of ethanol. The models were analysed for T- cell lineage and plasma cell differentiation, germinal centre formation and IgG levels and sialylation. Molecular expression of T follicular helper cell (TFH) activation such as IL-21, Bcl-6 and PD-1, as well as TFH: B cell conjugates were also assessed. Furthermore, TFH cells were generated in vitro, exposed to ethanol or acetate and tested for IL-21 production, PD1 expression and conjugate formation with B cells.Results:Ethanol exposure significantly inhibited arthritis in the active adaptive immunity-driven model of arthritis (CIA) but not in the passive innate immunity-driven model (STA) suggesting that the immune suppressive effect of alcohol is based on interference of T- and B- cell activation. In line ethanol and even more its metabolite acetate, suppressed T cell dependent antibody formation after NP-CGG immunization, while T cell independent antibody formation after TNP-FICOLL immunization was not suppressed. Ethanol, as well as its metabolite acetate, specifically altered the functional state of T follicular helper (TFH) cells in vitro and in vivo, thereby exerting immune regulatory and tolerance-inducing properties. Alcohol-exposed mice showed reduced Bcl6 and PD-1 expression as well as interleukin (IL)-21 production by TFH cells, preventing proper spatial organization of TFH cells to form TFH: B cell conjugates in the germinal centre. This effect of alcohol on TFHcells was associated with impaired autoantibody formation, higher sialylation of autoantibodies and less arthritis. In accordance, overexpression of IL-21 in vivo completely reversed the immune regulatory effects of alcohol.Conclusion:In summary, these data provide a new mechanistic explanation for the immune regulatory and tolerance-inducing effect of alcohol consumption in arthritis.Acknowledgments:Funden by DFG-FOR2886, DFG–CRC1181, Staedtler foundation, Johannes und Frieda Marohn-Stiftung, Else Kröner-Fresenius foundation, Interdisciplinary Centre for Clinical Research, Erlangen, BMBF-MASCARA, IMI funded project RTCure.Disclosure of Interests:Vugar Azizov: None declared, Maria V Sokolova: None declared, Kerstin Sarter: None declared, Vladimir Temchura: None declared, Ulrike Steffen (née Harre): None declared, Martin Herrmann: None declared, Georg Schett Speakers bureau: AbbVie, BMS, Celgene, Janssen, Eli Lilly, Novartis, Roche and UCB, Mario Zaiss: None declared
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Summ O, Schute J, Byhahn C, Kahle T, Herrmann M, Schulte C, Bergold MN, Groß M. [COVID-19 pandemic: structured expansion of ventilation capacities using home respirators]. Anaesthesist 2020; 69:323-330. [PMID: 32350543 PMCID: PMC7189831 DOI: 10.1007/s00101-020-00780-z] [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] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Due to the current COVID-19 pandemic there is a need for a rapid increase in intensive care and ventilation capacities. Delivery times for additional intensive care respirators are currently not foreseeable. An option to increase ventilation capacities not only for COVID-19, but for all patients requiring mechanical ventilation is to use home respirators. Home respirators are turbine respirators, so they can usually be operated without high-pressure oxygen connections and can therefore also be used in areas outside the classical intensive care medical infrastructure. Due to their limited technical features, home respirators are not suitable for the treatment of severely affected patients but can be used for weaning after respiratory improvement, which means that intensive care respirators are available again more quickly. Respiratory therapists are specially trained nurses or therapists in the field of out of hospital ventilation and can independently use home ventilation respirators, for example for weaning in the intensive care unit. Thus, they relieve intensive care nursing staff in the pandemic. Due to the COVID-19 pandemic medical students from the Oldenburg University are currently being trained in operating home respirators to provide basic support in the hospital if necessary.
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Affiliation(s)
- O Summ
- Klinik für Neurologische Intensivmedizin und Frührehabilitation, Evangelisches Krankenhaus, Medizinischer Campus Universität Oldenburg, Steinweg 13-17, 26122, Oldenburg, Deutschland
| | - J Schute
- Therapiezentrum, Evangelisches Krankenhaus, Medizinischer Campus Universität Oldenburg, Oldenburg, Deutschland
| | - C Byhahn
- Klinik für Anästhesiologie, Intensivmedizin und Schmerztherapie, Evangelisches Krankenhaus, Medizinischer Campus Universität Oldenburg, Oldenburg, Deutschland
| | - T Kahle
- Therapiezentrum, Evangelisches Krankenhaus, Medizinischer Campus Universität Oldenburg, Oldenburg, Deutschland
| | - M Herrmann
- Therapiezentrum, Evangelisches Krankenhaus, Medizinischer Campus Universität Oldenburg, Oldenburg, Deutschland
| | - C Schulte
- Therapiezentrum, Evangelisches Krankenhaus, Medizinischer Campus Universität Oldenburg, Oldenburg, Deutschland
| | - M N Bergold
- Klinik für Anästhesiologie, Intensivmedizin und Schmerztherapie, Evangelisches Krankenhaus, Medizinischer Campus Universität Oldenburg, Oldenburg, Deutschland
| | - M Groß
- Klinik für Neurologische Intensivmedizin und Frührehabilitation, Evangelisches Krankenhaus, Medizinischer Campus Universität Oldenburg, Steinweg 13-17, 26122, Oldenburg, Deutschland.
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Herrmann M, Geesink P, Yan L, Lehmann R, Totsche KU, Küsel K. Complex food webs coincide with high genetic potential for chemolithoautotrophy in fractured bedrock groundwater. Water Res 2020; 170:115306. [PMID: 31770650 DOI: 10.1016/j.watres.2019.115306] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [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: 07/11/2019] [Revised: 10/14/2019] [Accepted: 11/12/2019] [Indexed: 06/10/2023]
Abstract
Groundwater ecosystems face the challenge of energy limitation due to the absence of light-driven primary production. Lack of space and low oxygen availability might further contribute to generally assumed low food web complexity. Chemolithoautotrophy provides additional input of carbon within the subsurface, however, we still do not understand how abundances of chemolithoautotrophs, differences in surface carbon input, and oxygen availability control subsurface food web complexity. Using a molecular approach, we aimed to disentangle the different levels of potential trophic interactions in oligotrophic groundwater along a hillslope setting of alternating mixed carbonate-/siliciclastic bedrock with contrasting hydrochemical conditions and hotspots of chemolithoautotrophy. Across all sites, groundwater harbored diverse protist communities including Ciliophora, Cercozoa, Centroheliozoa, and Amoebozoa but correlations with hydrochemical parameters were less pronounced for eukaryotes compared to bacteria. Ciliophora-affiliated reads dominated the eukaryotic data sets across all sites. DNA-based evidence for the presence of metazoan top predators such as Cyclopoida (Arthropoda) and Stenostomidae (Platyhelminthes) was only found at wells where abundances of functional genes associated with chemolithoautotrophy were 10-100 times higher compared to wells without indications of these top predators. At wells closer to recharge areas with presumably increased inputs of soil-derived substances and biota, fungi accounted for up to 85% of the metazoan-curated eukaryotic sequence data, together with a low potential for chemolithoautotrophy. Although we did not directly observe higher organisms, our results point to the existence of complex food webs with several trophic levels in oligotrophic groundwater. Chemolithoautotrophy appears to provide strong support to more complex trophic interactions, feeding in additional biomass produced by light-independent CO2-fixation.
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Affiliation(s)
- M Herrmann
- Friedrich Schiller University Jena, Institute of Biodiversity, Aquatic Geomicrobiology, Dornburger Strasse 159, D-07743, Jena, Germany; German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Deutscher Platz 5e, D-04103, Leipzig, Germany
| | - P Geesink
- Friedrich Schiller University Jena, Institute of Biodiversity, Aquatic Geomicrobiology, Dornburger Strasse 159, D-07743, Jena, Germany
| | - L Yan
- Friedrich Schiller University Jena, Institute of Biodiversity, Aquatic Geomicrobiology, Dornburger Strasse 159, D-07743, Jena, Germany; German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Deutscher Platz 5e, D-04103, Leipzig, Germany
| | - R Lehmann
- Friedrich Schiller University Jena, Institute of Geosciences, Chair of Hydrogeology, Burgweg 11, D-07749, Jena, Germany
| | - K U Totsche
- Friedrich Schiller University Jena, Institute of Geosciences, Chair of Hydrogeology, Burgweg 11, D-07749, Jena, Germany
| | - K Küsel
- Friedrich Schiller University Jena, Institute of Biodiversity, Aquatic Geomicrobiology, Dornburger Strasse 159, D-07743, Jena, Germany; German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Deutscher Platz 5e, D-04103, Leipzig, Germany.
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Gloy K, Herrmann M, Fehr T. Decision making under uncertainty in a quasi realistic binary decision task - An fMRI study. Brain Cogn 2020; 140:105549. [PMID: 32088499 DOI: 10.1016/j.bandc.2020.105549] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2019] [Revised: 12/20/2019] [Accepted: 02/12/2020] [Indexed: 12/15/2022]
Abstract
Approaching real life decision making through Quasi Realistic Decision Making may increase the ecological validity of decision making experiments. This could help narrow the gap between laboratory settings and observations in real world contexts and thus allow for generalization of laboratory results to everyday life. A binary decision task with quasi realistic context and stimuli was created to investigate neural processing of certain and uncertain decision making, using functional Magnetic Resonance Imaging. On the basis of behavioral data (consistency of decisions in identical contexts), trials with uncertain and certain decision making were identified. This allowed for comparing uncertain and certain conditions, and contrasting each condition with a low level baseline (i.e., between trial fixation dot). A Conjunction analysis between contrasts of uncertainty versus baseline and certainty versus baseline indicated a large overlap of neural network recruitment distributed in bilateral middle frontal, medial frontal, inferior parietal, occipito-temporal, and medio-temporal areas, and the cingulate cortex. While basic neural processing principles in uncertain and certain contexts were comparable, the direct contrast revealed activation foci in middle cingulate and in frontal and parietal areas. The quasi realistic approach revealed a common network for decision making which is modulated by uncertainty.
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Affiliation(s)
- K Gloy
- University of Bremen, Department of Neuropsychology and Behavioral Neurobiology, Hochschulring 18, 28359 Bremen, Germany; University of Bremen, Center for Cognitive Sciences, Germany.
| | - M Herrmann
- University of Bremen, Department of Neuropsychology and Behavioral Neurobiology, Hochschulring 18, 28359 Bremen, Germany; University of Bremen, Center for Cognitive Sciences, Germany
| | - T Fehr
- University of Bremen, Department of Neuropsychology and Behavioral Neurobiology, Hochschulring 18, 28359 Bremen, Germany; University of Bremen, Center for Cognitive Sciences, Germany
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Kampmeier S, Rennebaum F, Schmidt H, Riegel A, Herrmann M, Schaumburg F. Peripancreatic abscess supported by Bordetella hinzii. New Microbes New Infect 2020; 34:100650. [PMID: 32025312 PMCID: PMC6997295 DOI: 10.1016/j.nmni.2020.100650] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2019] [Revised: 12/30/2019] [Accepted: 01/03/2020] [Indexed: 11/18/2022] Open
Abstract
We report a novel case of an infection with Bordetella hinzii, a pathogen usually detected in poultry, supporting a peripancreatic abscess formation as a complication of an acute necrotizing pancreatitis.
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Affiliation(s)
- S. Kampmeier
- Institute of Hygiene, University Hospital Münster, Germany
- Institute of Medical Microbiology, University Hospital Münster, Germany
- Corresponding author: S. Kampmeier, Institute of Hygiene, University Hospital Münster, Robert-Koch-Strasse 41, 48149, Münster, Germany.
| | - F. Rennebaum
- Department of Gastroenterology and Hepatology, University Hospital Münster, Germany
| | - H. Schmidt
- Department of Gastroenterology and Hepatology, University Hospital Münster, Germany
| | - A. Riegel
- Department of Clinical Radiology, University of Münster, Münster, Germany
| | - M. Herrmann
- Institute of Medical Microbiology, University Hospital Münster, Germany
- Section of Medical and Geographical Infectiology, University Hospital Münster, Germany
| | - F. Schaumburg
- Institute of Medical Microbiology, University Hospital Münster, Germany
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Strege RJ, Kiefer R, Herrmann M. Contributing factors to quality of life after vertebral artery dissection: a prospective comparative study. BMC Neurol 2019; 19:312. [PMID: 31801464 PMCID: PMC6894297 DOI: 10.1186/s12883-019-1541-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [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] [Received: 08/22/2019] [Accepted: 11/25/2019] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Vertebral artery dissection (VAD) may cause cerebral ischemia and impair quality of life (QOL) despite of good functional outcome. The aim of this study was the multimodal analysis of patient characteristics after VAD to identify contributing factors. METHODS In an exploratory study, 34 consecutive patients with first-ever spontaneous VAD were prospectively examined in comparison to 38 patients with cerebral ischemia without dissection and 25 stroke mimics as control groups. Multimodal assessment was performed for clinical, neurological, cognitive, psychological and radiological data at baseline and for QOL, functional outcome, and stress symptoms by questionnaire at six months follow-up. Subgroup analysis stratified for QOL by Stroke Specific Quality of Life Scale (SS-QOL) were done for patients with good functional outcome (modified Ranking Scale (mRS) scoring 0-2). Predictors for QOL at follow-up were analyzed by regression model. RESULTS 88.2% of patients with VAD suffered from acute cerebral ischemia. Thirteen of 32 VAD patients (40.6%) rated QOL at follow-up as bad (SS-QOL score ≤ 3.9) despite of good functional outcome (mRS score 0-2). Subgroup analysis yielded significantly higher scores for posttraumatic stress symptoms (p = 0.002) in this subgroup. Posttraumatic stress symptoms, severity of neurological disorders, and impaired neuropsychological baseline performance proved to be independent predictors for reduced QOL at follow-up according to regression analysis. CONCLUSION VAD leads to impaired QOL at 6 months follow-up due to multiple factors. The data suggest that posttraumatic stress symptoms are of significant importance for the QOL after VAD. Clinical monitoring should address this topic to make timely treatment possible.
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Affiliation(s)
- Rainer J Strege
- Department of Neurology, AGAPLESION Diakonieklinikum Rotenburg, Elise-Averdieck-Str.17, 27356, Rotenburg, Germany. .,Center for Cognitive Sciences, Department of Neuropsychology and Behavioral Neurobiology, University of Bremen, Hochschulring 18, D-28359, Bremen, Germany.
| | - Reinhard Kiefer
- Department of Neurology, AGAPLESION Diakonieklinikum Rotenburg, Elise-Averdieck-Str.17, 27356, Rotenburg, Germany
| | - Manfred Herrmann
- Center for Cognitive Sciences, Department of Neuropsychology and Behavioral Neurobiology, University of Bremen, Hochschulring 18, D-28359, Bremen, Germany
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van Meer F, van der Laan LN, Eiben G, Lissner L, Wolters M, Rach S, Herrmann M, Erhard P, Molnar D, Orsi G, Viergever MA, Adan RA, Smeets PA. Development and body mass inversely affect children’s brain activation in dorsolateral prefrontal cortex during food choice. Neuroimage 2019; 201:116016. [DOI: 10.1016/j.neuroimage.2019.116016] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2018] [Revised: 06/17/2019] [Accepted: 07/11/2019] [Indexed: 01/21/2023] Open
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Barros MRF, Chagas RA, Herrmann M, Bezerra AM. New record of the invasive snail Melanoides tuberculata (Gastropoda, Thiaridae) - Ceará State, Brazil. BRAZ J BIOL 2019; 80:368-372. [PMID: 31508657 DOI: 10.1590/1519-6984.210408] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2018] [Accepted: 01/11/2019] [Indexed: 11/21/2022] Open
Abstract
Melanoides tuberculata is a freshwater gastropod native to Africa and Asia, and currently presents distributed worldwide. The first record of Melanoides tuberculata in South America occurred in Brazil, in the city of Santos, state of São Paulo, in 1967. Therefore, the objective of the present study is to report the occurrence of Melanoides tuberculata for Banana Lagoon and to characterize the current population situation. The gastropods were collected through direct visualization of shells, morphometric measurements of Melanoides tuberculata shells were determined using a digital caliper. After identifying the gastropod and its first distribution in the area, a preliminary descriptive analysis of the population was carried out. The gastropods were classified by grouping the individuals into four classes according to the shell width (mm). This is the first record of the occurrence of Melanoides tuberculata, in Banana Lagoon, Caucaia municipality, Ceará state, Northeast Brazil, being the largest specimen cited in the literature (33.77 mm) and 92.65% of the gastropods present in sizes above the first reproduction stages.
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Affiliation(s)
- M R F Barros
- Programa de Pós-graduação em Aquicultura e Recursos Aquáticos Tropicais, Instituto Socioambiental e dos Recursos Hídricos - ISARH, Universidade Federal Rural da Amazônia - UFRA, Av. Presidente Tancredo Neves, 2501, Montese, CP 917, CEP 66077-530, Belém, PA, Brasil
| | - R A Chagas
- Programa de Pós-graduação em Aquicultura e Recursos Aquáticos Tropicais, Instituto Socioambiental e dos Recursos Hídricos - ISARH, Universidade Federal Rural da Amazônia - UFRA, Av. Presidente Tancredo Neves, 2501, Montese, CP 917, CEP 66077-530, Belém, PA, Brasil
| | - M Herrmann
- Programa de Pós-graduação em Aquicultura e Recursos Aquáticos Tropicais, Instituto Socioambiental e dos Recursos Hídricos - ISARH, Universidade Federal Rural da Amazônia - UFRA, Av. Presidente Tancredo Neves, 2501, Montese, CP 917, CEP 66077-530, Belém, PA, Brasil
| | - A M Bezerra
- Programa de Pós-graduação em Saúde e Produção Animal na Amazônia, Universidade Federal Rural da Amazônia - UFRA, Av. Presidente Tancredo Neves, 2501, Montese, CP 917, CEP 66077-530, Belém, PA, Brasil
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Le Goff C, Zelzer S, Huyghebaert L, Segura JF, Fabregat-Cabello N, Herrmann M, Cavalier E. Method comparison of the 24,25(OH)2D3 measurement with two different LC-MS/MS assays. Clin Chim Acta 2019. [DOI: 10.1016/j.cca.2019.03.715] [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: 10/26/2022]
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Herrmann M, Simons B, Horst A, Boehme S, Straube T, Polak T. Transcranial direct current stimulation (tDCS) of the right inferior frontal cortex (rIFC) attenuates sustained fear. Brain Stimul 2019. [DOI: 10.1016/j.brs.2018.12.400] [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: 10/27/2022] Open
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Abstract
Mesenchymal stem/stromal cells (MSCs) are an essential element of most modern tissue engineering and regenerative medicine approaches due to their multipotency and immunoregulatory functions. Despite the prospective value of MSCs for the clinics, the stem cells community is questioning their developmental origin, in vivo localization, identification, and regenerative potential after several years of far-reaching research in the field. Although several major progresses have been made in mimicking the complexity of the MSC niche in vitro, there is need for comprehensive studies of fundamental mechanisms triggered by microenvironmental cues before moving to regenerative medicine cell therapy applications. The present comprehensive review extensively discusses the microenvironmental cues that influence MSC phenotype and function in health and disease - including cellular, chemical and physical interactions. The most recent and relevant illustrative examples of novel bioengineering approaches to mimic biological, chemical, and mechanical microenvironmental signals present in the native MSC niche are summarized, with special emphasis on the forefront techniques to achieve bio-chemical complexity and dynamic cultures. In particular, the skeletal MSC niche and applications focusing on the bone regenerative potential of MSC are addressed. The aim of the review was to recognize the limitations of the current MSC niche in vitro models and to identify potential opportunities to fill the bridge between fundamental science and clinical application of MSCs.
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Affiliation(s)
| | | | - M Herrmann
- IZKF Group Tissue Regeneration in Musculoskeletal Diseases, Orthopedic Center for Musculoskeletal Research, Würzburg,
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Perlaki G, Molnar D, Smeets PAM, Ahrens W, Wolters M, Eiben G, Lissner L, Erhard P, van Meer F, Herrmann M, Janszky J, Orsi G. Volumetric gray matter measures of amygdala and accumbens in childhood overweight/obesity. PLoS One 2018; 13:e0205331. [PMID: 30335775 PMCID: PMC6193643 DOI: 10.1371/journal.pone.0205331] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2018] [Accepted: 09/24/2018] [Indexed: 11/18/2022] Open
Abstract
Objectives Neuroimaging data suggest that pediatric overweight and obesity are associated with morphological alterations in gray matter (GM) brain structures, but previous studies using mainly voxel-based morphometry (VBM) showed inconsistent results. Here, we aimed to examine the relationship between youth obesity and the volume of predefined reward system structures using magnetic resonance (MR) volumetry. We also aimed to complement volumetry with VBM-style analysis. Methods Fifty-one Caucasian young subjects (32 females; mean age: 13.8±1.9, range: 10.2–16.5 years) were included. Subjects were selected from a subsample of the I.Family study examined in the Hungarian center. A T1-weighted 1 mm3 isotropic resolution image was acquired. Age- and sex-standardized body mass index (zBMI) was assessed at the day of MRI and ~1.89 years (mean±SD: 689±188 days) before the examination. Obesity related GM alterations were investigated using MR volumetry in five predefined brain structures presumed to play crucial roles in body weight regulation (hippocampus, amygdala, accumbens, caudate, putamen), as well as whole-brain and regional VBM. Results The volumes of accumbens and amygdala showed significant positive correlations with zBMI, while their GM densities were inversely related to zBMI. Voxel-based GM mass also showed significant negative correlation with zBMI when investigated in the predefined amygdala region, but this relationship was mediated by GM density. Conclusions Overweight/obesity related morphometric brain differences already seem to be present in children/adolescents. Our work highlights the disparity between volume and VBM-derived measures and that GM mass (combination of volume and density) is not informative in the context of obesity related volumetric changes. To better characterize the association between childhood obesity and GM morphometry, a combination of volumetric segmentation and VBM methods, as well as future longitudinal studies are necessary. Our results suggest that childhood obesity is associated with enlarged structural volumes, but decreased GM density in the reward system.
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Affiliation(s)
- Gabor Perlaki
- MTA-PTE Clinical Neuroscience MR Research Group, Pecs, Hungary
- Department of Neurology, University of Pecs, Medical School, Pecs, Hungary
- * E-mail:
| | - Denes Molnar
- Department of Pediatrics, University of Pecs, Medical School, Pecs, Hungary
| | - Paul A. M. Smeets
- Image Sciences Institute, University Medical Center Utrecht, Utrecht University, Utrecht, Netherlands
- Division of Human Nutrition, Wageningen University & Research, Wageningen, Netherlands
| | - Wolfgang Ahrens
- Leibniz Institute for Prevention Research and Epidemiology—BIPS, Bremen, Germany
| | - Maike Wolters
- Leibniz Institute for Prevention Research and Epidemiology—BIPS, Bremen, Germany
| | - Gabriele Eiben
- Department of Public Health and Community Medicine, University of Gothenburg, Gothenburg, Sweden
- Department of Biomedicine and Public Health, School of Health and Education, University of Skövde, Skövde, Sweden
| | - Lauren Lissner
- Department of Public Health and Community Medicine, University of Gothenburg, Gothenburg, Sweden
| | - Peter Erhard
- Center for Cognitive Sciences, University of Bremen, Bremen, Germany
- Department of Neuropsychology and Behavioral Neurobiology, University of Bremen, Bremen, Germany
| | - Floor van Meer
- Image Sciences Institute, University Medical Center Utrecht, Utrecht University, Utrecht, Netherlands
| | - Manfred Herrmann
- Center for Cognitive Sciences, University of Bremen, Bremen, Germany
- Department of Neuropsychology and Behavioral Neurobiology, University of Bremen, Bremen, Germany
| | - Jozsef Janszky
- MTA-PTE Clinical Neuroscience MR Research Group, Pecs, Hungary
- Department of Neurology, University of Pecs, Medical School, Pecs, Hungary
| | - Gergely Orsi
- MTA-PTE Clinical Neuroscience MR Research Group, Pecs, Hungary
- Department of Neurology, University of Pecs, Medical School, Pecs, Hungary
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Hausdörfer T, Kanzow P, Tschammler C, Herrmann M, Wiegand A. Dental Students' Factual and Procedural Knowledge Retention in Operative Dentistry in a Clinical Dental Curriculum. J Dent Educ 2018; 82:943-948. [PMID: 30173190 DOI: 10.21815/jde.018.092] [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: 09/26/2017] [Accepted: 02/10/2018] [Indexed: 11/20/2022]
Abstract
The aim of this study was to evaluate dental students' retention of factual and procedural knowledge gained in a preclinical course in operative dentistry during a clinical dental curriculum. In 2017, all 157 seventh- to tenth-semester dental students at a dental school in Germany were asked to repeat the same written examination performed at the end of the preclinical course in the sixth semester. The examinations consisted of 30 multiple-choice questions covering factual and procedural knowledge. The percentage of correctly answered questions per exam and differences in correct answers between the original examination and the re-examination (per question) were analyzed. Students were also asked to self-rate their percentage of correctly answered questions and their knowledge in various disciplines of operative dentistry at the times of the original examination and the re-examination. After exclusions, data were analyzed for 129 students, for a participation rate of 82%. For the seventh- and tenth-semester students, the results on the original examination and the re-examination were not significantly different, while the eighth- and ninth-semester students performed significantly better on the original examination than the re-examination. In all semesters, procedural knowledge remained stable between the original examination and the re-examination, while factual knowledge decreased slightly. Their performance on the original examination was underestimated by the eighth- and ninth-semester students. All the students underestimated their performance on the re-examination. Students mostly rated their knowledge level significantly higher on the original examination than on the re-examination. Overall, this study found that factual and procedural knowledge gained in a preclinical course in operative dentistry was not increased during the clinical dental curriculum.
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Affiliation(s)
- Tim Hausdörfer
- Tim Hausdörfer, Dr med dent, is Assistant Professor, Department of Preventive Dentistry, Periodontology, and Cariology, University Medical Center Göttingen, Germany; Philipp Kanzow, Dr med dent, MBA, is Assistant Professor, Department of Preventive Dentistry, Periodontology, and Cariology, University Medical Center Göttingen, Germany; Claudia Tschammler, Dr med dent, is Assistant Professor, Department of Preventive Dentistry, Periodontology, and Cariology, University Medical Center Göttingen, Germany; Manfred Herrmann, Dr rer nat, is Assistant Professor, Division of Medical Education Research and Curriculum Development, Study Deanery of University Medical Center Göttingen, Germany; and Annette Wiegand, Prof Dr med dent, is Professor and Head, Department of Preventive Dentistry, Periodontology, and Cariology, University Medical Center Göttingen, Germany.
| | - Philipp Kanzow
- Tim Hausdörfer, Dr med dent, is Assistant Professor, Department of Preventive Dentistry, Periodontology, and Cariology, University Medical Center Göttingen, Germany; Philipp Kanzow, Dr med dent, MBA, is Assistant Professor, Department of Preventive Dentistry, Periodontology, and Cariology, University Medical Center Göttingen, Germany; Claudia Tschammler, Dr med dent, is Assistant Professor, Department of Preventive Dentistry, Periodontology, and Cariology, University Medical Center Göttingen, Germany; Manfred Herrmann, Dr rer nat, is Assistant Professor, Division of Medical Education Research and Curriculum Development, Study Deanery of University Medical Center Göttingen, Germany; and Annette Wiegand, Prof Dr med dent, is Professor and Head, Department of Preventive Dentistry, Periodontology, and Cariology, University Medical Center Göttingen, Germany
| | - Claudia Tschammler
- Tim Hausdörfer, Dr med dent, is Assistant Professor, Department of Preventive Dentistry, Periodontology, and Cariology, University Medical Center Göttingen, Germany; Philipp Kanzow, Dr med dent, MBA, is Assistant Professor, Department of Preventive Dentistry, Periodontology, and Cariology, University Medical Center Göttingen, Germany; Claudia Tschammler, Dr med dent, is Assistant Professor, Department of Preventive Dentistry, Periodontology, and Cariology, University Medical Center Göttingen, Germany; Manfred Herrmann, Dr rer nat, is Assistant Professor, Division of Medical Education Research and Curriculum Development, Study Deanery of University Medical Center Göttingen, Germany; and Annette Wiegand, Prof Dr med dent, is Professor and Head, Department of Preventive Dentistry, Periodontology, and Cariology, University Medical Center Göttingen, Germany
| | - Manfred Herrmann
- Tim Hausdörfer, Dr med dent, is Assistant Professor, Department of Preventive Dentistry, Periodontology, and Cariology, University Medical Center Göttingen, Germany; Philipp Kanzow, Dr med dent, MBA, is Assistant Professor, Department of Preventive Dentistry, Periodontology, and Cariology, University Medical Center Göttingen, Germany; Claudia Tschammler, Dr med dent, is Assistant Professor, Department of Preventive Dentistry, Periodontology, and Cariology, University Medical Center Göttingen, Germany; Manfred Herrmann, Dr rer nat, is Assistant Professor, Division of Medical Education Research and Curriculum Development, Study Deanery of University Medical Center Göttingen, Germany; and Annette Wiegand, Prof Dr med dent, is Professor and Head, Department of Preventive Dentistry, Periodontology, and Cariology, University Medical Center Göttingen, Germany
| | - Annette Wiegand
- Tim Hausdörfer, Dr med dent, is Assistant Professor, Department of Preventive Dentistry, Periodontology, and Cariology, University Medical Center Göttingen, Germany; Philipp Kanzow, Dr med dent, MBA, is Assistant Professor, Department of Preventive Dentistry, Periodontology, and Cariology, University Medical Center Göttingen, Germany; Claudia Tschammler, Dr med dent, is Assistant Professor, Department of Preventive Dentistry, Periodontology, and Cariology, University Medical Center Göttingen, Germany; Manfred Herrmann, Dr rer nat, is Assistant Professor, Division of Medical Education Research and Curriculum Development, Study Deanery of University Medical Center Göttingen, Germany; and Annette Wiegand, Prof Dr med dent, is Professor and Head, Department of Preventive Dentistry, Periodontology, and Cariology, University Medical Center Göttingen, Germany
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Fehr T, Staniloiu A, Markowitsch HJ, Erhard P, Herrmann M. Neural correlates of free recall of "famous events" in a "hypermnestic" individual as compared to an age- and education-matched reference group. BMC Neurosci 2018; 19:35. [PMID: 29914377 PMCID: PMC6006772 DOI: 10.1186/s12868-018-0435-y] [Citation(s) in RCA: 2] [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] [Received: 05/30/2017] [Accepted: 06/01/2018] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Memory performance of an individual (within the age range: 50-55 years old) showing superior memory abilities (protagonist PR) was compared to an age- and education-matched reference group in a historical facts ("famous events") retrieval task. RESULTS Contrasting task versus baseline performance both PR and the reference group showed fMRI activation patterns in parietal and occipital brain regions. The reference group additionally demonstrated activation patterns in cingulate gyrus, whereas PR showed additional widespread activation patterns comprising frontal and cerebellar brain regions. The direct comparison between PR and the reference group revealed larger fMRI contrasts for PR in right frontal, superior temporal and cerebellar brain regions. CONCLUSIONS It was concluded that PR generally recruits brain regions as normal memory performers do, but in a more elaborate way, and furthermore, that he applied a memory-strategy that potentially includes executively driven multi-modal transcoding of information and recruitment of implicit memory resources.
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Affiliation(s)
- Thorsten Fehr
- Center for Cognitive Sciences, University of Bremen, Bremen, Germany. .,University of Bremen, Hochschulring 18, 28359, Bremen, Germany. .,Center for Advanced Imaging, Universities of Bremen and Magdeburg, Bremen, Germany.
| | - Angelica Staniloiu
- Physiological Psychology, University of Bielefeld, Bielefeld, Germany.,Hanse Institute for Advanced Study (HWK), Delmenhorst, Germany
| | - Hans J Markowitsch
- Physiological Psychology, University of Bielefeld, Bielefeld, Germany.,Hanse Institute for Advanced Study (HWK), Delmenhorst, Germany
| | - Peter Erhard
- Center for Cognitive Sciences, University of Bremen, Bremen, Germany.,Center for Advanced Imaging, Universities of Bremen and Magdeburg, Bremen, Germany.,AG in vivo MR, University of Bremen, Bremen, Germany
| | - Manfred Herrmann
- Center for Cognitive Sciences, University of Bremen, Bremen, Germany.,University of Bremen, Hochschulring 18, 28359, Bremen, Germany.,Center for Advanced Imaging, Universities of Bremen and Magdeburg, Bremen, Germany
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26
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Fedosov A, Puillandre N, Herrmann M, Kantor Y, Oliverio M, Dgebuadze P, Modica MV, Bouchet P. The collapse of Mitra: molecular systematics and morphology of the Mitridae (Gastropoda: Neogastropoda). Zool J Linn Soc 2018. [DOI: 10.1093/zoolinnean/zlx073] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Affiliation(s)
- Alexander Fedosov
- A.N. Severtzov Institute of Ecology and Evolution of Russian Academy of Sciences, Leninskiy Prospect, Moscow, Russia
- Institut de Systématique, Évolution, Biodiversité ISYEB – UMR 7205 – CNRS, MNHN, UPMC, EPHE, Muséum National d’Histoire Naturelle, Sorbonne Universités, Paris, France
| | - Nicolas Puillandre
- Institut de Systématique, Évolution, Biodiversité ISYEB – UMR 7205 – CNRS, MNHN, UPMC, EPHE, Muséum National d’Histoire Naturelle, Sorbonne Universités, Paris, France
| | | | - Yuri Kantor
- A.N. Severtzov Institute of Ecology and Evolution of Russian Academy of Sciences, Leninskiy Prospect, Moscow, Russia
- Institut de Systématique, Évolution, Biodiversité ISYEB – UMR 7205 – CNRS, MNHN, UPMC, EPHE, Muséum National d’Histoire Naturelle, Sorbonne Universités, Paris, France
| | - Marco Oliverio
- Department of Biology and Biotechnologies ‘Charles Darwin’, ‘Sapienza’ University of Rome, Viale dell’Università, Roma, Italy
| | - Polina Dgebuadze
- A.N. Severtzov Institute of Ecology and Evolution of Russian Academy of Sciences, Leninskiy Prospect, Moscow, Russia
| | | | - Philippe Bouchet
- Institut de Systématique, Évolution, Biodiversité ISYEB – UMR 7205 – CNRS, MNHN, UPMC, EPHE, Muséum National d’Histoire Naturelle, Sorbonne Universités, Paris, France
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27
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Harraghy N, Seiler S, Jacobs K, Hannig M, Menger MD, Herrmann M. Advances in in Vitro and in Vivo Models for Studying the Staphylococcal Factors Involved in Implant Infections. Int J Artif Organs 2018; 29:368-78. [PMID: 16705605 DOI: 10.1177/039139880602900406] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Implant infections due to staphylococci are one of the greatest threats facing patients receiving implant devices. For many years researchers have sought to understand the mechanisms involved in the adherence of the bacterium to the implanted device and the formation of the unique structure, the biofilm, which protects the indwelling bacteria from the host defence and renders them resistant to antibiotic treatment. A major goal has been to develop in vitro and in vivo models that adequately reflect the real-life situation. From the simple microtiter plate assay and scanning electron microscopy, tools for studying adherence and biofilm formation have since evolved to include specialised equipment for studying adherence, flow cell systems, real-time analysis of biofilm formation using reporter gene assays both in vitro and in vivo, and a wide variety of animal models. In this article, we discuss advances in the last few years in selected in vitro and in vivo models as well as future developments in the study of adherence and biofilm formation by the staphylococci.
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Affiliation(s)
- N Harraghy
- Institute of Medical Microbiology and Hygiene, University of Saarland, Homburg/Saar, Germany.
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28
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Hawryluk R, Barnes CW, Batha S, Beer M, Bell M, Bell R, Berk H, Bitter M, Bretz N, Budny R, Bush C, Cauffman S, Chang CS, Chang Z, Cheng C, Darrow D, Dendy R, Dorland W, Dudek L, Duong H, Durst R, Efthimion P, Evenson H, Fisch N, Fisher R, Fonck R, Forrest C, Fredrickson E, Fu G, Furth H, Gorelenkov N, Grek B, Grisham L, Hammett G, Heidbrink W, Herrmann H, Herrmann M, Hill K, Hooper B, Hosea J, Houlberg W, Hughes M, Jassby D, Jobes F, Johnson D, Kaita R, Kamperschroer J, Kesner J, Krazilniknov A, Kugel H, Kumar A, LaMarche P, LeBlanc B, Levine J, Levinton F, Lin Z, Machuzak J, Majeski R, Mansfield D, Mazzucato E, Mauel M, McChesney J, McGuire K, McKee G, Meade D, Medley S, Mikkelsen D, Mimov S, Mueller D, Navratil G, Nazikian R, Nevins B, Okabayashi M, Osakabe M, Owens D, Park H, Park W, Paul S, Petrov M, Phillips C, Phillips M, Phillips P, Ramsey A, Redi M, Rewoldt G, Rice B, Rogers J, Roquemore A, Ruskov E, Sabbagh S, Sasao M, Schilling G, Schmidt G, Scott S, Semenov I, Skinner C, Spong D, Strachan J, Strait E, Stratton B, Synakowski E, Takahashi H, Tang W, Taylor G, Goeler SV, Halle AV, White R, Williams M, Wilson J, Wong K, Wurden G, Young K, Zarnstorff M, Zweben S. Review of D-T Results from TFTR. ACTA ACUST UNITED AC 2018. [DOI: 10.13182/fst96-a11963011] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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29
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Herrmann M, Opitz S, Harzer R, Totsche KU, Küsel K. Attached and Suspended Denitrifier Communities in Pristine Limestone Aquifers Harbor High Fractions of Potential Autotrophs Oxidizing Reduced Iron and Sulfur Compounds. Microb Ecol 2017; 74:264-277. [PMID: 28214969 DOI: 10.1007/s00248-017-0950-x] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [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: 09/30/2016] [Accepted: 02/09/2017] [Indexed: 06/06/2023]
Abstract
Oxygen and nitrate availability as well as the presence of suitable organic or inorganic electron donors are strong drivers of denitrification; however, the factors influencing denitrifier abundance and community composition in pristine aquifers are not well understood. We explored the denitrifier community structure of suspended and attached groundwater microorganisms in two superimposed limestone aquifer assemblages with contrasting oxygen regime in the Hainich Critical Zone Exploratory (Germany). Attached communities were retrieved from freshly crushed parent rock material which had been exposed for colonization in two groundwater wells (12.7 and 48 m depth). Quantitative PCR and amplicon pyrosequencing of nirK and nirS genes encoding copper-containing or cytochrome cd1 heme-type nitrite reductase, respectively, and of bacterial 16S ribosomal RNA genes showed a numerical predominance of nirS-type denitrifiers in both attached and suspended groundwater communities and a dominance of nirS-type denitrifiers closely related to the autotrophic thiosulfate- and hydrogen-oxidizing Sulfuritalea hydrogenivorans and the iron- and sulfide-oxidizing Sideroxydans lithotrophicus ES-1. Potential rates of nitrate reduction in association with exposed crushed rock material were higher with an inorganic electron donor (thiosulfate) compared to an organic electron donor (fumarate/acetate) in the upper aquifer assemblage but similar in the lower, oxic aquifer. Our results have clearly demonstrated that groundwater from pristine limestone aquifers harbors diverse denitrifier communities which appear to selectively attach to rock surfaces and harbor a high potential for nitrate reduction. Our findings suggest that the availability of suitable inorganic versus organic electron donors rather than oxygen availability shapes denitrifier communities and their potential activity in these limestone aquifers.
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Affiliation(s)
- M Herrmann
- Aquatic Geomicrobiology, Institute of Ecology, Friedrich Schiller University Jena, Dornburger Strasse 159, 07743, Jena, Germany.
- German Center for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Deutscher Platz 5e, 04103, Leipzig, Germany.
| | - S Opitz
- Aquatic Geomicrobiology, Institute of Ecology, Friedrich Schiller University Jena, Dornburger Strasse 159, 07743, Jena, Germany
| | - R Harzer
- Aquatic Geomicrobiology, Institute of Ecology, Friedrich Schiller University Jena, Dornburger Strasse 159, 07743, Jena, Germany
| | - K U Totsche
- Institute of Geosciences, Friedrich Schiller University Jena, Burgweg 11, 07749, Jena, Germany
| | - K Küsel
- Aquatic Geomicrobiology, Institute of Ecology, Friedrich Schiller University Jena, Dornburger Strasse 159, 07743, Jena, Germany
- German Center for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Deutscher Platz 5e, 04103, Leipzig, Germany
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30
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Stümer J, Biermann MHC, Knopf J, Magorivska I, Kastbom A, Svärd A, Janko C, Bilyy R, Schett G, Sjöwall C, Herrmann M, Muñoz LE. Altered glycan accessibility on native immunoglobulin G complexes in early rheumatoid arthritis and its changes during therapy. Clin Exp Immunol 2017; 189:372-382. [PMID: 28509333 DOI: 10.1111/cei.12987] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/09/2017] [Indexed: 12/31/2022] Open
Abstract
The goal of this study was to investigate the glycosylation profile of native immunoglobulin (Ig)G present in serum immune complexes in patients with rheumatoid arthritis (RA). To accomplish this, lectin binding assays, detecting the accessibility of glycans present on IgG-containing immune complexes by biotinylated lectins, were employed. Lectins capturing fucosyl residues (AAL), fucosylated tri-mannose N-glycan core sites (LCA), terminal sialic acid residues (SNA) and O-glycosidically linked galactose/N-acetylgalactosamine (GalNac-L) were used. Patients with recent-onset RA at baseline and after 3-year follow-up were investigated. We found that native IgG was complexed significantly more often with IgM, C1q, C3c and C-reactive protein (CRP) in RA patients, suggesting alterations of the native structure of IgG. The total accessibility of fucose residues on captured immune complexes to the respective lectin was significantly higher in patients with RA. Moreover, fucose accessibility on IgG-containing immune complexes correlated positively with the levels of antibodies to cyclic citrullinated peptides (anti-CCP). We also observed a significantly higher accessibility to sialic acid residues and galactose/GalNAc glyco-epitopes in native complexed IgG of patients with RA at baseline. While sialic acid accessibility increased during treatment, the accessibility of galactose/GalNAc decreased. Hence, successful treatment of RA was associated with an increase in the SNA/GalNAc-L ratio. Interestingly, the SNA/GalNAc-L ratio in particular rises after glucocorticoid treatment. In summary, this study shows the exposure of glycans in native complexed IgG of patients with early RA, revealing particular glycosylation patterns and its changes following pharmaceutical treatment.
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Affiliation(s)
- J Stümer
- Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Department of Internal Medicine 3, Rheumatology and Immunology, Universitätsklinikum Erlangen, Erlangen, Germany
| | - M H C Biermann
- Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Department of Internal Medicine 3, Rheumatology and Immunology, Universitätsklinikum Erlangen, Erlangen, Germany
| | - J Knopf
- Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Department of Internal Medicine 3, Rheumatology and Immunology, Universitätsklinikum Erlangen, Erlangen, Germany
| | - I Magorivska
- Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Department of Internal Medicine 3, Rheumatology and Immunology, Universitätsklinikum Erlangen, Erlangen, Germany.,Danylo Halytsky Lviv National Medical University, Lviv, Ukraine
| | - A Kastbom
- Rheumatology/Division of Neuro and Inflammation Sciences, Department of Clinical and Experimental Medicine, Linköping University, Linköping, Sweden
| | - A Svärd
- Rheumatology Clinic, Falun Hospital, Falun, Sweden
| | - C Janko
- Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Department of Internal Medicine 3, Rheumatology and Immunology, Universitätsklinikum Erlangen, Erlangen, Germany.,Department of Otorhinolaryngology, Head and Neck Surgery, Section of Experimental Oncology and Nanomedicine (SEON), University Hospital Erlangen, Erlangen, Germany
| | - R Bilyy
- Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Department of Internal Medicine 3, Rheumatology and Immunology, Universitätsklinikum Erlangen, Erlangen, Germany.,Danylo Halytsky Lviv National Medical University, Lviv, Ukraine
| | - G Schett
- Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Department of Internal Medicine 3, Rheumatology and Immunology, Universitätsklinikum Erlangen, Erlangen, Germany
| | - C Sjöwall
- Rheumatology/Division of Neuro and Inflammation Sciences, Department of Clinical and Experimental Medicine, Linköping University, Linköping, Sweden
| | - M Herrmann
- Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Department of Internal Medicine 3, Rheumatology and Immunology, Universitätsklinikum Erlangen, Erlangen, Germany
| | - L E Muñoz
- Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Department of Internal Medicine 3, Rheumatology and Immunology, Universitätsklinikum Erlangen, Erlangen, Germany
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31
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Zink A, Herrmann M, Fischer T, Lauffer F, Garzorz-Stark N, Böhner A, Spinner CD, Biedermann T, Eyerich K. Addiction: an underestimated problem in psoriasis health care. J Eur Acad Dermatol Venereol 2017; 31:1308-1315. [PMID: 28281329 DOI: 10.1111/jdv.14204] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2016] [Accepted: 01/16/2017] [Indexed: 12/13/2022]
Abstract
BACKGROUND Psoriasis is a disease of enormous socio-economic impact. Despite approval of numerous highly efficient and costly therapies, a minor proportion of severely affected patients actually receives sufficient treatment. OBJECTIVE To investigate whether addictions are associated with psoriasis and to develop evidence-based recommendations for dermatologists in their daily clinical practice in order to improve medical assessment of psoriasis and patients' quality of life. PATIENTS AND METHODS Psoriasis patients at the University Department of Dermatology were asked to fill out a paper-based self-reported anonymous questionnaire with 92 questions of validated screening tests for the six most common addictions in Germany (alcohol, nicotine, drugs and illegal drugs, gambling, food). Body weight and height as well as current Psoriasis Area and Severity Index (PASI) were documented as well. RESULTS Between October 2015 and February 2016, 102 patients (65 males, 37 females; mean age 49.7 years (SD 13.4), range 18-83 years) participated in the study. Fifty-seven of the 102 patients showed addictive behaviour. Of these, 23.8% were high-risk drinkers, 41% regular smokers, 11% at risk of drug abuse, 4.1% at risk of food dependency and 19% compulsive gamblers. Compared with the general population, these results are significantly higher for alcohol abuse (P < 0.005), nicotine (P < 0.001) and gambling (P < 0.001). Body mass index was significantly higher in the study population (P < 0.001). CONCLUSION Addictions and gambling are more prevalent in patients with psoriasis compared with the general population. Respective screening measures are recommended in daily practice for doctors treating psoriasis patients, and PeakPASI is suggested as a score to document patients' lifetime highest PASI. Parallel to new drug approvals and even more detailed insights into the pathomechanism of psoriasis, public health strategies and interdisciplinary approaches are essential for a general sustained psoriasis treatment.
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Affiliation(s)
- A Zink
- Department of Dermatology and Allergy, University Hospital Klinikum rechts der Isar, Technical University of Munich, Munich, Germany
| | - M Herrmann
- Department of Dermatology and Allergy, University Hospital Klinikum rechts der Isar, Technical University of Munich, Munich, Germany
| | - T Fischer
- Department of Dermatology and Allergy, University Hospital Klinikum rechts der Isar, Technical University of Munich, Munich, Germany
| | - F Lauffer
- Department of Dermatology and Allergy, University Hospital Klinikum rechts der Isar, Technical University of Munich, Munich, Germany
| | - N Garzorz-Stark
- Department of Dermatology and Allergy, University Hospital Klinikum rechts der Isar, Technical University of Munich, Munich, Germany
| | - A Böhner
- Department of Dermatology and Allergy, University Hospital Klinikum rechts der Isar, Technical University of Munich, Munich, Germany
| | - C D Spinner
- Department of Medicine II, University Hospital Klinikum rechts der Isar, Technical University of Munich, Munich, Germany
| | - T Biedermann
- Department of Dermatology and Allergy, University Hospital Klinikum rechts der Isar, Technical University of Munich, Munich, Germany
| | - K Eyerich
- Department of Dermatology and Allergy, University Hospital Klinikum rechts der Isar, Technical University of Munich, Munich, Germany
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Biermann MHC, Griffante G, Podolska MJ, Boeltz S, Stürmer J, Muñoz LE, Bilyy R, Herrmann M. Sweet but dangerous - the role of immunoglobulin G glycosylation in autoimmunity and inflammation. Lupus 2017; 25:934-42. [PMID: 27252272 DOI: 10.1177/0961203316640368] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Glycosylation is well-known to modulate the functional capabilities of immunoglobulin G (IgG)-mediated cellular and humoral responses. Indeed, highly sialylated and desialylated IgG is endowed with anti- and pro-inflammatory activities, respectively, whereas fully deglycosylated IgG is a rather lame duck, with no effector function besides toxin neutralization. Recently, several studies revealed the impact of different glycosylation patterns on the Fc part and Fab fragment of IgG in several autoimmune diseases, including systemic lupus erythematosus (SLE) and rheumatoid arthritis (RA). Here, we provide a synoptic update summarizing the most important aspects of antibody glycosylation, and the current progress in this field. We also discuss the therapeutic options generated by the modification of the glycosylation of IgG in a potential treatment for chronic inflammatory diseases.
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Affiliation(s)
- M H C Biermann
- Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Department of Internal Medicine 3 - Rheumatology and Immunology, Universitätsklinikum Erlangen, Erlangen, Germany
| | - G Griffante
- Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Department of Internal Medicine 3 - Rheumatology and Immunology, Universitätsklinikum Erlangen, Erlangen, Germany
| | - M J Podolska
- Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Department of Internal Medicine 3 - Rheumatology and Immunology, Universitätsklinikum Erlangen, Erlangen, Germany
| | - S Boeltz
- Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Department of Internal Medicine 3 - Rheumatology and Immunology, Universitätsklinikum Erlangen, Erlangen, Germany
| | - J Stürmer
- Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Department of Internal Medicine 3 - Rheumatology and Immunology, Universitätsklinikum Erlangen, Erlangen, Germany
| | - L E Muñoz
- Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Department of Internal Medicine 3 - Rheumatology and Immunology, Universitätsklinikum Erlangen, Erlangen, Germany
| | - R Bilyy
- Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Department of Internal Medicine 3 - Rheumatology and Immunology, Universitätsklinikum Erlangen, Erlangen, Germany Danylo Halytsky Lviv National Medical University, Lviv, Ukraine
| | - M Herrmann
- Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Department of Internal Medicine 3 - Rheumatology and Immunology, Universitätsklinikum Erlangen, Erlangen, Germany
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Trudzinski F, Schlotthauer U, Kamp A, Hennemann K, Gärtner B, Wilkens H, Bals R, Herrmann M, Lepper PM, Becker SL. Die klinische Relevanz des Nachweises von Mycobacterium Chimaera in Themperaturregulierungsgeräten für die extrakorporale Membranoxygenierung. Pneumologie 2017. [DOI: 10.1055/s-0037-1598431] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- F Trudzinski
- Innere Medizin V, Pneumologie, Allergologie, Beatmungs- und Umweltmedizin, Universitätsklinikum des Saarlandes
| | - U Schlotthauer
- Institut für Medizinische Mikrobiologie und Hygiene am Universitätsklinikum des Saarlandes
| | - A Kamp
- Innere Medizin V, Pneumologie, Allergologie, Beatmungs- und Umweltmedizin, Universitätsklinikum des Saarlandes
| | - K Hennemann
- Klinik für Thorax- und Herz-Gefäßchirurgie am Universitätsklinikum des Saarlandes
| | - B Gärtner
- Institut für Medizinische Mikrobiologie und Hygiene am Universitätsklinikum des Saarlandes
| | - H Wilkens
- Innere Medizin V, Pneumologie, Allergologie, Beatmungs- und Umweltmedizin, Universitätsklinikum des Saarlandes
| | - R Bals
- Innere Medizin V, Pneumologie, Allergologie, Beatmungs- und Umweltmedizin, Universitätsklinikum des Saarlandes
| | - M Herrmann
- Institut für Medizinische Mikrobiologie und Hygiene am Universitätsklinikum des Saarlandes
| | - PM Lepper
- Innere Medizin V, Pneumologie, Allergologie, Beatmungs- und Umweltmedizin, Universitätsklinikum des Saarlandes
| | - SL Becker
- Institut für Medizinische Mikrobiologie und Hygiene am Universitätsklinikum des Saarlandes
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Zink A, Herrmann M, Fischer T, Böhner A, Lauffer F, Garzorz-Stark N, Biedermann T, Eyerich K. 045 Psoriasis and addictions: a neglected challenge. J Invest Dermatol 2016. [DOI: 10.1016/j.jid.2016.06.062] [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: 11/25/2022]
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Herrmann M, Meisel P, Lippmann W, Hurtado A. Joining technology—A challenge for the use of SiC components in HTRs. Nuclear Engineering and Design 2016. [DOI: 10.1016/j.nucengdes.2015.12.022] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Siemann J, Herrmann M, Galashan D. fMRI-constrained source analysis reveals early top-down modulations of interference processing using a flanker task. Neuroimage 2016; 136:45-56. [DOI: 10.1016/j.neuroimage.2016.05.036] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2015] [Revised: 04/13/2016] [Accepted: 05/10/2016] [Indexed: 11/16/2022] Open
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Schneider H, Brock M, Herrmann M, Wolf K. CFC-Free Hot-Curing Moulded Flexible Foam for Automotive Seating. J CELL PLAST 2016. [DOI: 10.1177/0021955x9202800303] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Affiliation(s)
- H.G. Schneider
- Bayer AG, PU-Anwendungstechnik, Technische Stellungnahme, 5090 Leverkusen, Bayerwerk, Federal Republic of Germany
| | - M. Brock
- Bayer AG, PU-Anwendungstechnik, Technische Stellungnahme, 5090 Leverkusen, Bayerwerk, Federal Republic of Germany
| | - M. Herrmann
- Bayer AG, PU-Anwendungstechnik, Technische Stellungnahme, 5090 Leverkusen, Bayerwerk, Federal Republic of Germany
| | - K.D. Wolf
- Bayer AG, PU-Anwendungstechnik, Technische Stellungnahme, 5090 Leverkusen, Bayerwerk, Federal Republic of Germany
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Phaku P, Lebughe M, Strauß L, Peters G, Herrmann M, Mumba D, Mellmann A, Muyembe-Tamfum JJ, Schaumburg F. Unveiling the molecular basis of antimicrobial resistance in Staphylococcus aureus from the Democratic Republic of the Congo using whole genome sequencing. Clin Microbiol Infect 2016; 22:644.e1-5. [PMID: 27102139 DOI: 10.1016/j.cmi.2016.04.009] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [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: 02/24/2016] [Revised: 03/29/2016] [Accepted: 04/08/2016] [Indexed: 11/25/2022]
Abstract
Staphylococcus aureus from sub-Saharan Africa is frequently resistant to antimicrobial agents that are commonly used to treat invasive infections in resource-limited settings. The underlying mechanisms of resistance are largely unknown. We therefore performed whole genome sequencing (WGS) on S. aureus from the Democratic Republic of the Congo (DRC) to analyse the genetic determinants of antimicrobial resistance. One hundred S. aureus samples were collected from community-associated asymptomatic nasal carriers in the metropolitan area of Kinshasa, DRC, between 2013 and 2014. Phenotypic resistance against 15 antimicrobial agents was compared to the genotypic results that were extracted from WGS data using Mykrobe predictor and the SeqSphere(+) software that screened for 106 target genes associated with resistance. Isolates were phenotypically resistant against penicillin (97%, n=97), trimethoprim (72%, n=72) and tetracycline (54%, n=45). Thirty-three isolates (33%) were methicillin-resistant S. aureus (MRSA). Of these, nine isolates (27.3%) were oxacillin-susceptible MRSA (OS-MRSA) and belonged to ST8 (t1476). The Y195F mutation of FemA was associated with OS-MRSA (p 0.015). The majority of trimethoprim resistant isolates carried dfrG. Tetracycline resistance was associated with tet(K). The concordance between phenotypic susceptibility testing and both WGS analysis tools was similar and ranged between 96% and 100%. In conclusion, a high proportion of OS-MRSA in the DRC was linked to mutations of FemA. Genotypic and phenotypical antimicrobial susceptibility testing showed high concordance. This encourages the future use of WGS in routine antimicrobial susceptibility testing.
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Affiliation(s)
- P Phaku
- Institut National de Recherche Bio-Médicale, Université de Kinshasa, Kinshasa, Democratic Republic of the Congo
| | - M Lebughe
- Institut National de Recherche Bio-Médicale, Université de Kinshasa, Kinshasa, Democratic Republic of the Congo
| | - L Strauß
- Institute of Hygiene, University Hospital Münster, Münster, Germany
| | - G Peters
- Institute of Medical Microbiology, University Hospital Münster, Münster, Germany
| | - M Herrmann
- Institute of Medical Microbiology and Hygiene, University Hospital of Saarland, Homburg, Germany
| | - D Mumba
- Institut National de Recherche Bio-Médicale, Université de Kinshasa, Kinshasa, Democratic Republic of the Congo
| | - A Mellmann
- Institute of Hygiene, University Hospital Münster, Münster, Germany
| | - J-J Muyembe-Tamfum
- Institut National de Recherche Bio-Médicale, Université de Kinshasa, Kinshasa, Democratic Republic of the Congo
| | - F Schaumburg
- Institute of Medical Microbiology, University Hospital Münster, Münster, Germany.
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Heudorf U, Cuny C, Herrmann M, Kempf V, Mischler D, Schulze J, Zinn C. Multiresistente Erreger (MRE) in der ambulanten Dialyse, der ambulanten und stationären Pflege sowie in der Rehabilitation – Daten aus dem MRE-Netz Rhein-Main 2012 – 2014. Gesundheitswesen 2016. [DOI: 10.1055/s-0036-1578866] [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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43
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Herrmann M, Bara JJ, Sprecher CM, Menzel U, Jalowiec JM, Osinga R, Scherberich A, Alini M, Verrier S. Pericyte plasticity - comparative investigation of the angiogenic and multilineage potential of pericytes from different human tissues. Eur Cell Mater 2016; 31:236-49. [PMID: 27062725 DOI: 10.22203/ecm.v031a16] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [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: 01/31/2023] Open
Abstract
Pericyte recruitment is essential for the stability of newly formed vessels. It was also suggested that pericytes represent common ancestor cells giving rise to mesenchymal stem cells (MSCs) in the adult. Here, we systematically investigated pericytes and MSCs from different human tissues in terms of their angiogenic and multilineage differentiation potential in vitro in order to assess the suitability of the different cell types for the regeneration of vascularised tissues. Magnetic-activated cell sorting (MACS®) was used to enrich CD34-CD146+ pericytes from adipose tissue (AT) and bone marrow (BM). The multilineage potential of pericytes was assessed by testing their capability to differentiate towards osteogenic, adipogenic and chondrogenic lineage in vitro. Pericytes and endothelial cells were co-seeded on Matrigel™ and the formation of tube-like structures was examined to study the angiogenic potential of pericytes. MSCs from AT and BM were used as controls. CD34-CD146+ cells were successfully enriched from AT and BM. Only BM-derived cells exhibited trilineage differentiation potential. AT-derived cells displayed poor chondrogenic differentiation upon stimulation with transforming growth factor-β1. Interestingly, osteogenic differentiation was more efficient in AT-PC and BM-PC compared to the respective full MSC population. Matrigel™ assays revealed that pericytes from all tissues integrated into tube-like structures. We show that MACS®-enriched pericytes from BM and AT have the potential to regenerate tissues of different mesenchymal lineages and support neovascularisation. MACS® represents a simple enrichment strategy of cells, which is of particular interest for clinical application. Finally, our results suggest that the regenerative potential of pericytes depends on their tissue origin, which is an important consideration for future studies.
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Affiliation(s)
- M Herrmann
- AO Research Institute Davos, Clavadelerstrasse 8, 7270 Davos Platz,
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Korsch M, Frühholz S, Herrmann M. Conflict-Specific Aging Effects Mainly Manifest in Early Information Processing Stages-An ERP Study with Different Conflict Types. Front Aging Neurosci 2016; 8:53. [PMID: 27014059 PMCID: PMC4792879 DOI: 10.3389/fnagi.2016.00053] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [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] [Received: 08/11/2015] [Accepted: 02/29/2016] [Indexed: 12/03/2022] Open
Abstract
Aging is usually accompanied by alterations of cognitive control functions such as conflict processing. Recent research suggests that aging effects on cognitive control seem to vary with degree and source of conflict, and conflict specific aging effects on performance measures as well as neural activation patterns have been shown. However, there is sparse information whether and how aging affects different stages of conflict processing as indicated by event related potentials (ERPs) such as the P2, N2 and P3 components. In the present study, 19 young and 23 elderly adults performed a combined Flanker conflict and stimulus-response-conflict (SRC) task. Analysis of the reaction times (RTs) revealed an increased SRC related conflict effect in elderly. ERP analysis furthermore demonstrated an age-related increase of the P2 amplitude in response to the SRC task. In addition, elderly adults exhibited an increased P3 amplitude modulation induced by incongruent SRC and Flanker conflict trials.
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Affiliation(s)
- Margarethe Korsch
- Department of Neuropsychology and Behavioral Neurobiology, Bremen UniversityHochschulring, Bremen, Germany; Center for Cognitive Sciences (ZKW), Bremen UniversityHochschulring, Bremen, Germany
| | - Sascha Frühholz
- Department of Neuropsychology and Behavioral Neurobiology, Bremen UniversityHochschulring, Bremen, Germany; Department of Psychology, University of ZurichZurich, Switzerland
| | - Manfred Herrmann
- Department of Neuropsychology and Behavioral Neurobiology, Bremen UniversityHochschulring, Bremen, Germany; Center for Cognitive Sciences (ZKW), Bremen UniversityHochschulring, Bremen, Germany
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45
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Maueröder C, Chaurio RA, Dumych T, Podolska M, Lootsik MD, Culemann S, Friedrich RP, Bilyy R, Alexiou C, Schett G, Berens C, Herrmann M, Munoz LE. A blast without power - cell death induced by the tuberculosis-necrotizing toxin fails to elicit adequate immune responses. Cell Death Differ 2016; 23:1016-25. [PMID: 26943324 DOI: 10.1038/cdd.2016.4] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2015] [Revised: 12/25/2015] [Accepted: 12/29/2015] [Indexed: 12/14/2022] Open
Abstract
In this study, we deploy a doxycycline-dependent suicide switch integrated in a tumor challenge model. With this experimental setup, we characterized the immunological consequences of cells dying by four distinct cell death stimuli in vivo. We observed that apoptotic cell death induced by expression of the truncated form of BH3 interacting-domain death agonist (tBid) and a constitutively active form of caspase 3 (revC3), respectively, showed higher immunogenicity than cell death induced by expression of the tuberculosis-necrotizing toxin (TNT). Our data indicate that the early release of ATP induces the silent clearance of dying cells, whereas the simultaneous presence of 'find me' signals and danger-associated molecular patterns (DAMPs) promotes inflammatory reactions and increased immunogenicity. This proposed model is supported by findings showing that the production and release of high concentrations of IL-27 by bone-marrow-derived macrophages (BMDM) is limited to BMDM exposed to those forms of death that simultaneously released ATP and the DAMPs heat-shock protein 90 (HSP90) and high-mobility group box-1 protein (HMGB1). These results demonstrate that the tissue microenvironment generated by dying cells may determine the subsequent immune response.
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Affiliation(s)
- C Maueröder
- Department of Internal Medicine 3 - Rheumatology and Immunology, Friedrich-Alexander University of Erlangen-Nuremberg, Erlangen, Germany
| | - R A Chaurio
- Department of Internal Medicine 3 - Rheumatology and Immunology, Friedrich-Alexander University of Erlangen-Nuremberg, Erlangen, Germany
| | - T Dumych
- Danylo Halytsky Lviv National Medical University, Lviv, Ukraine.,Institute of Cell Biology, National Academy of Sciences of Ukraine, Lviv, Ukraine
| | - M Podolska
- Department of Internal Medicine 3 - Rheumatology and Immunology, Friedrich-Alexander University of Erlangen-Nuremberg, Erlangen, Germany
| | - M D Lootsik
- Danylo Halytsky Lviv National Medical University, Lviv, Ukraine.,Institute of Cell Biology, National Academy of Sciences of Ukraine, Lviv, Ukraine
| | - S Culemann
- Department of Internal Medicine 3 - Rheumatology and Immunology, Friedrich-Alexander University of Erlangen-Nuremberg, Erlangen, Germany
| | - R P Friedrich
- ENT Clinic, Section of Experimental Oncology and Nanomedicine (SEON), Else Kröner-Fresenius-Stiftung Professorship, University Hospital Erlangen, Erlangen, Germany
| | - R Bilyy
- Department of Internal Medicine 3 - Rheumatology and Immunology, Friedrich-Alexander University of Erlangen-Nuremberg, Erlangen, Germany.,Danylo Halytsky Lviv National Medical University, Lviv, Ukraine
| | - C Alexiou
- ENT Clinic, Section of Experimental Oncology and Nanomedicine (SEON), Else Kröner-Fresenius-Stiftung Professorship, University Hospital Erlangen, Erlangen, Germany
| | - G Schett
- Department of Internal Medicine 3 - Rheumatology and Immunology, Friedrich-Alexander University of Erlangen-Nuremberg, Erlangen, Germany
| | - C Berens
- Institute of Molecular Pathogenesis, Friedrich-Loeffler-Institut, Federal Research Institute for Animal Health, Jena, Germany
| | - M Herrmann
- Department of Internal Medicine 3 - Rheumatology and Immunology, Friedrich-Alexander University of Erlangen-Nuremberg, Erlangen, Germany
| | - L E Munoz
- Department of Internal Medicine 3 - Rheumatology and Immunology, Friedrich-Alexander University of Erlangen-Nuremberg, Erlangen, Germany
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Birge RB, Boeltz S, Kumar S, Carlson J, Wanderley J, Calianese D, Barcinski M, Brekken RA, Huang X, Hutchins JT, Freimark B, Empig C, Mercer J, Schroit AJ, Schett G, Herrmann M. Phosphatidylserine is a global immunosuppressive signal in efferocytosis, infectious disease, and cancer. Cell Death Differ 2016; 23:962-78. [PMID: 26915293 PMCID: PMC4987730 DOI: 10.1038/cdd.2016.11] [Citation(s) in RCA: 442] [Impact Index Per Article: 55.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2015] [Revised: 01/05/2016] [Accepted: 01/07/2016] [Indexed: 02/06/2023] Open
Abstract
Apoptosis is an evolutionarily conserved and tightly regulated cell death modality. It serves important roles in physiology by sculpting complex tissues during embryogenesis and by removing effete cells that have reached advanced age or whose genomes have been irreparably damaged. Apoptosis culminates in the rapid and decisive removal of cell corpses by efferocytosis, a term used to distinguish the engulfment of apoptotic cells from other phagocytic processes. Over the past decades, the molecular and cell biological events associated with efferocytosis have been rigorously studied, and many eat-me signals and receptors have been identified. The externalization of phosphatidylserine (PS) is arguably the most emblematic eat-me signal that is in turn bound by a large number of serum proteins and opsonins that facilitate efferocytosis. Under physiological conditions, externalized PS functions as a dominant and evolutionarily conserved immunosuppressive signal that promotes tolerance and prevents local and systemic immune activation. Pathologically, the innate immunosuppressive effect of externalized PS has been hijacked by numerous viruses, microorganisms, and parasites to facilitate infection, and in many cases, establish infection latency. PS is also profoundly dysregulated in the tumor microenvironment and antagonizes the development of tumor immunity. In this review, we discuss the biology of PS with respect to its role as a global immunosuppressive signal and how PS is exploited to drive diverse pathological processes such as infection and cancer. Finally, we outline the rationale that agents targeting PS could have significant value in cancer and infectious disease therapeutics.
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Affiliation(s)
- R B Birge
- Department of Microbiology, Biochemistry and Molecular Genetics, Cancer Center, Rutgers New Jersey Medical School, 205 South Orange Ave, Newark, NJ 07103, USA
| | - S Boeltz
- Department of Internal Medicine 3-Rheumatology and Immunology, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), University Hospital Erlangen, 91054 Erlangen, Germany
| | - S Kumar
- Department of Microbiology, Biochemistry and Molecular Genetics, Cancer Center, Rutgers New Jersey Medical School, 205 South Orange Ave, Newark, NJ 07103, USA
| | - J Carlson
- Peregrine Pharmaceuticals, 14282 Franklin Avenue, Tustin, CA 92780, USA
| | - J Wanderley
- Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - D Calianese
- Department of Microbiology, Biochemistry and Molecular Genetics, Cancer Center, Rutgers New Jersey Medical School, 205 South Orange Ave, Newark, NJ 07103, USA
| | - M Barcinski
- Laboratório de Biologia Celular, Instituto Oswaldo Cruz, Rio de Janeiro, Brazil
| | - R A Brekken
- Division of Surgical Oncology, Department of Surgery, Hamon Center for Therapeutic Oncology Research, Dallas, TX 75390-8593, USA.,Department of Pharmacology, University of Texas Southwestern Medical Center, Dallas, TX 75390-8593, USA
| | - X Huang
- Division of Surgical Oncology, Department of Surgery, Hamon Center for Therapeutic Oncology Research, Dallas, TX 75390-8593, USA.,Department of Pharmacology, University of Texas Southwestern Medical Center, Dallas, TX 75390-8593, USA
| | - J T Hutchins
- Peregrine Pharmaceuticals, 14282 Franklin Avenue, Tustin, CA 92780, USA
| | - B Freimark
- Peregrine Pharmaceuticals, 14282 Franklin Avenue, Tustin, CA 92780, USA
| | - C Empig
- Peregrine Pharmaceuticals, 14282 Franklin Avenue, Tustin, CA 92780, USA
| | - J Mercer
- Medical Research Council Laboratory for Molecular Cell Biology, University College London, Gower Street, London WC1E 6BT, UK
| | - A J Schroit
- Simmons Cancer Center and the Department of Immunology, University of Texas Southwestern Medical Center, Dallas, TX 75390 USA
| | - G Schett
- Department of Internal Medicine 3-Rheumatology and Immunology, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), University Hospital Erlangen, 91054 Erlangen, Germany
| | - M Herrmann
- Department of Internal Medicine 3-Rheumatology and Immunology, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), University Hospital Erlangen, 91054 Erlangen, Germany
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Trudzinski F, Becker S, Flaig M, Langer F, Bals R, Wilkens H, Herrmann M, Lepper PM. Nachweis von Mycobacterium chimaera in Temperaturregulierungsgeräten der extrakorporalen Membranoxygenation (ECMO). Pneumologie 2016. [DOI: 10.1055/s-0036-1572109] [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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48
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Magorivska I, Muñoz LE, Janko C, Dumych T, Rech J, Schett G, Nimmerjahn F, Bilyy R, Herrmann M. Sialylation of anti-histone immunoglobulin G autoantibodies determines their capabilities to participate in the clearance of late apoptotic cells. Clin Exp Immunol 2016; 184:110-7. [PMID: 26618514 DOI: 10.1111/cei.12744] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/27/2015] [Indexed: 12/22/2022] Open
Abstract
The Fc portion of immunoglobulin (Ig)G harbours a single glycosylation site. Glycan sialylation is critical for structure and for certain effector functions of IgG. Anti-histone IgG of patients with systemic lupus erythematosus is reportedly responsible for the recruitment of polymorphonuclear cells (PMN) to the clearance of apoptotic cells. Autoantibodies decorating secondary necrotic cells (SNEC) induce proinflammatory responses after activation of blood-borne phagocytes. Analysing the sialylation status of affinity-purified anti-histone IgG in patients with systemic lupus erythematosus (SLE), we demonstrated that the anti-histone IgG was contained preferentially in the non-sialylated fraction. In functional ex-vivo phagocytosis studies, non-sialylated anti-SNEC IgG directed SNEC preferentially into PMN but did not change their cytokine secretion profiles. In contrast, sialylated IgG reduced the phagocytosis by monocytes of SNEC. Moreover, the sialylated anti-SNEC IgG was not simply anti-inflammatory, but switched the cytokine secretion profiles from interleukin (IL)-6/IL-8 to tumour necrosis factor (TNF)-α/IL-1β. Here we describe how different sialylation statuses of IgG autoantibodies contribute to the complex inflammatory network that regulates chronic inflammation.
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Affiliation(s)
- I Magorivska
- Department of Internal Medicine 3 Rheumatology and Immunology, Friedrich-Alexander University Erlangen-Nürnberg, Erlangen, Germany.,Institute of Cell Biology, National Academy of Sciences of Ukraine, Lviv, Ukraine
| | - L E Muñoz
- Department of Internal Medicine 3 Rheumatology and Immunology, Friedrich-Alexander University Erlangen-Nürnberg, Erlangen, Germany
| | - C Janko
- Department of Otorhinolaryngology, Head and Neck Surgery, Friedrich-Alexander University Erlangen-Nürnberg, Erlangen, Germany
| | - T Dumych
- Institute of Cell Biology, National Academy of Sciences of Ukraine, Lviv, Ukraine
| | - J Rech
- Department of Internal Medicine 3 Rheumatology and Immunology, Friedrich-Alexander University Erlangen-Nürnberg, Erlangen, Germany
| | - G Schett
- Department of Internal Medicine 3 Rheumatology and Immunology, Friedrich-Alexander University Erlangen-Nürnberg, Erlangen, Germany
| | - F Nimmerjahn
- Chair of Genetic, Department of Biology, Friedrich-Alexander University Erlangen-Nürnberg, Erlangen, Germany
| | - R Bilyy
- Department of Internal Medicine 3 Rheumatology and Immunology, Friedrich-Alexander University Erlangen-Nürnberg, Erlangen, Germany.,Institute of Cell Biology, National Academy of Sciences of Ukraine, Lviv, Ukraine
| | - M Herrmann
- Department of Internal Medicine 3 Rheumatology and Immunology, Friedrich-Alexander University Erlangen-Nürnberg, Erlangen, Germany
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Heudorf U, Färber D, Mischler D, Schade M, Zinn C, Nillius D, Herrmann M. Multiresistente Erreger in Rehabilitationseinrichtungen im Rhein-Main-Gebiet, Deutschland, 2014: II. Ärztliche Risikoanalyse und Hygienemaßnahmen. REHABILITATION 2015; 54:375-81. [DOI: 10.1055/s-0035-1564099] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
| | | | | | | | - C. Zinn
- Institut für Medizinische Diagnostik GmbH, Zentrum für Hygiene und Infektionsprävention, Ingelheim
| | - D. Nillius
- Institut für Medizinische Mikrobiologie und Hygiene, Universitätsklinikum des Saarlandes, Homburg/Saar und MRSAar Netz
| | - M. Herrmann
- Institut für Medizinische Mikrobiologie und Hygiene, Universitätsklinikum des Saarlandes, Homburg/Saar und MRSAar Netz
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Heudorf U, Färber D, Mischler D, Schade M, Zinn C, Cuny C, Nillius D, Herrmann M. [Multidrug-Resistant Organisms (MDRO) in Rehabilitation Clinics in the Rhine-Main-District, Germany, 2014: Prevalence and Risk Factors]. REHABILITATION 2015; 54:339-45. [PMID: 26505186 DOI: 10.1055/s-0035-1559642] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
BACKGROUND While a limited number of studies have investigated the prevalence of methicillin-resistant Staphylococcus aureus (MRSA) in medical rehabilitation institutions, almost no data on the colonization of rehabilitation patients with multiresistant gram-negative rods is available. Here we report on a large multicenter study on the prevalence of MRSA and multiresistant pathogens in rehabilitation institutions in the Rhine-Main area in 2014. MATERIALS AND METHODS Altogether, 21 rehabilitation hospitals participated. For all patients, age, gender, previous history of hospitalizations, surgery, previous colonization with multidrug-resistant organisms, use of a medical device, current antimicrobial therapy, and the current infection status were ascertained. On voluntary basis, nare and throat swabs were taken for analysis of MRSA and rectal swabs were tested for extended spectrum betalactamase-producing gram-negative bacteria (ESBL). RESULTS 50% of 2 440 patients had a history of hospitalization within the previous 6 months while 39% had undergone surgery during the past 30 days. Approximately a quarter of the patients had been transferred to a rehabilitation hospital directly from an acute care hospital, had been under antimicrobial therapy with the past three months, or had travelled to a foreign country within the previous year. Risk factors such as lesions of the intact skin or presence of medical devices were rarely reported (< 5%) within the exception of patients undergoing geriatric or neurologic acute care rehabilitation. 0.7% (15/2155) of the patients were colonized with MRSA, while 7.7% (110/1434) showed a positive result for ESBL. The highest prevalence rates for multiresistant organisms were encountered among patients with neurologic rehabilitation (MRSA, 1.3%, and ESBL, 10.2%) or with geriatric rehabilitation (MRSA, 9.4%, and ESBL, 22.7%). CONCLUSION In the rehabilitation patient population, the prevalence rates of MRSA and ESBL were found to be in the range of rates encountered in the general population (reported rates for MRSA, 0.5%, and ESBL, 6.3%). The known risk factors for MRSA such as skin lesions, medical devices and previous history for MRSA were also confirmed among this patient population. Direct transfer from an acute care hospital, antimicrobial treatment during the past 3 months, and wounds proved significant risk factors for ESBL colonization. Patients of neurologic rehabilitation and geriatric patients showed the highest rates of risk factors and the highest prevalence rates of multidrug-resistant organisms. It appears to be of importance for rehabilitation hospitals to be geared to the needs of patients with multidrug-resistant organisms, and prevent the transmission of these pathogens by appropriate hygiene measures.
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Affiliation(s)
- U Heudorf
- MRE-Netz Rhein-Main, Gesundheitsamt der Stadt Frankfurt am Main
| | - D Färber
- MRE-Netz Rhein-Main, Gesundheitsamt der Stadt Frankfurt am Main
| | - D Mischler
- MRE-Netz Rhein-Main, Gesundheitsamt der Stadt Frankfurt am Main
| | - M Schade
- MRE-Netz Rhein-Main, Gesundheitsamt der Stadt Frankfurt am Main
| | - C Zinn
- Zentrum für Hygiene und Infektionsprävention, Institut für Medizinische Diagnostik GmbH, Ingelheim
| | - C Cuny
- Nationales Referenzzentrum für Staphylokokken, Wernigerode
| | - D Nillius
- Institut für Medizinische Mikrobiologie und Hygiene, Universitätsklinikum des Saarlandes, Homburg/Saar, und MRSAar Netz
| | - M Herrmann
- Institut für Medizinische Mikrobiologie und Hygiene, Universitätsklinikum des Saarlandes, Homburg/Saar, und MRSAar Netz
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