1
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Neuman V, Vavra D, Drnkova L, Pruhova S, Plachy L, Kolouskova S, Obermannova B, Amaratunga SA, Konecna P, Vyzralkova J, Venhacova P, Pomahacova R, Paterova P, Stichova L, Skvor J, Kocourkova K, Romanova M, Vosahlo J, Strnadel J, Polockova K, Neumann D, Slavenko M, Sumnik Z. Introduction of continuous glucose monitoring (CGM) is a key factor in decreasing HbA1c in war refugee children with type 1 diabetes. Diabetes Res Clin Pract 2024; 208:111118. [PMID: 38309536 DOI: 10.1016/j.diabres.2024.111118] [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: 11/10/2023] [Revised: 01/16/2024] [Accepted: 01/22/2024] [Indexed: 02/05/2024]
Abstract
AIMS Our aim was to describe the changes in therapy and diabetes control in Ukrainian war refugee children with diabetes (CwD) during the first year of their stay in Czechia. METHODS A total of 124 CwD (62 male, 62 female) were enrolled into this observational study. Anthropometric, laboratory and diabetes management data were acquired at baseline and at 3 months intervals for 12 months. All CwD were offered a CGM device during their first visit. Generalized Estimating Equation models were fitted in order to estimate the dynamics of studied characteristics. RESULTS Median baseline HbA1c was 58 mmol/mol (IQR [48; 73]mmol/mol) (7.5 %, IQR[6.5;8.8]%). The HbA1c decreased significantly throughout the course of the study at a pace of - 2.2 mmol/mol (-0.2 %pt.) per visit (P = 0.01, CI[-3.2;-1.1]). The pace of the decrease in the average HbA1c was significantly higher in the group of CwD who received CGM in Czechia than in those who already had it from Ukraine by 2.9 mmol/mol (0.27 %pt.) per visit (P < 0.001, CI [-4.4; -1.3]). CONCLUSIONS The steepest decrease in HbA1c was observed in CwD with newly initiated CGM underlining its vital role in improving the glucose control of CwD regardless of their background.
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Affiliation(s)
- V Neuman
- Department of Pediatrics, 2(nd) Faculty of Medicine, Charles University and Motol University Hospital, Prague, Czech Republic.
| | - D Vavra
- 3(rd) Faculty of Medicine, Charles University, Prague, Czech Republic
| | - L Drnkova
- Department of Pediatrics, 2(nd) Faculty of Medicine, Charles University and Motol University Hospital, Prague, Czech Republic
| | - S Pruhova
- Department of Pediatrics, 2(nd) Faculty of Medicine, Charles University and Motol University Hospital, Prague, Czech Republic
| | - L Plachy
- Department of Pediatrics, 2(nd) Faculty of Medicine, Charles University and Motol University Hospital, Prague, Czech Republic
| | - S Kolouskova
- Department of Pediatrics, 2(nd) Faculty of Medicine, Charles University and Motol University Hospital, Prague, Czech Republic
| | - B Obermannova
- Department of Pediatrics, 2(nd) Faculty of Medicine, Charles University and Motol University Hospital, Prague, Czech Republic
| | - S A Amaratunga
- Department of Pediatrics, 2(nd) Faculty of Medicine, Charles University and Motol University Hospital, Prague, Czech Republic
| | - P Konecna
- Department of Pediatrics, University Hospital Brno, Brno, Czech Republic
| | - J Vyzralkova
- Department of Pediatrics, University Hospital Brno, Brno, Czech Republic
| | - P Venhacova
- Department of Pediatrics, University Hospital Olomouc, Olomouc, Czech Republic
| | - R Pomahacova
- Department of Pediatrics, University Hospital Pilsen, Pilsen, Czech Republic
| | - P Paterova
- Department of Pediatrics, University Hospital Pilsen, Pilsen, Czech Republic
| | - L Stichova
- Department of Pediatrics, Masaryk Hospital, Usti nad Labem, Czech Republic
| | - J Skvor
- Department of Pediatrics, Masaryk Hospital, Usti nad Labem, Czech Republic
| | - K Kocourkova
- Department of Pediatrics, Ceske Budejovice Hospital, Ceske Budejovice, Czech Republic
| | - M Romanova
- Department of Pediatrics, 3(rd) Faculty of Medicine, Charles University and Kralovske Vinohrady University Hospital, Prague, Czech Republic
| | - J Vosahlo
- Department of Pediatrics, 3(rd) Faculty of Medicine, Charles University and Kralovske Vinohrady University Hospital, Prague, Czech Republic
| | - J Strnadel
- Department of Pediatrics, University Hospital Ostrava, Ostrava, Czech Republic
| | - K Polockova
- Department of Pediatrics, University Hospital Ostrava, Ostrava, Czech Republic
| | - D Neumann
- Department of Pediatrics, University Hospital Hradec Kralove, Hradec Kralove, Czech Republic
| | - M Slavenko
- Department of Pediatrics, 2(nd) Faculty of Medicine, Charles University and Motol University Hospital, Prague, Czech Republic
| | - Z Sumnik
- Department of Pediatrics, 2(nd) Faculty of Medicine, Charles University and Motol University Hospital, Prague, Czech Republic
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2
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Ghesu FC, Georgescu B, Mansoor A, Yoo Y, Neumann D, Patel P, Vishwanath RS, Balter JM, Cao Y, Grbic S, Comaniciu D. Contrastive self-supervised learning from 100 million medical images with optional supervision. J Med Imaging (Bellingham) 2022; 9:064503. [PMID: 36466078 PMCID: PMC9710476 DOI: 10.1117/1.jmi.9.6.064503] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Accepted: 11/14/2022] [Indexed: 12/05/2022] Open
Abstract
Purpose Building accurate and robust artificial intelligence systems for medical image assessment requires the creation of large sets of annotated training examples. However, constructing such datasets is very costly due to the complex nature of annotation tasks, which often require expert knowledge (e.g., a radiologist). To counter this limitation, we propose a method to learn from medical images at scale in a self-supervised way. Approach Our approach, based on contrastive learning and online feature clustering, leverages training datasets of over 100,000,000 medical images of various modalities, including radiography, computed tomography (CT), magnetic resonance (MR) imaging, and ultrasonography (US). We propose to use the learned features to guide model training in supervised and hybrid self-supervised/supervised regime on various downstream tasks. Results We highlight a number of advantages of this strategy on challenging image assessment problems in radiography, CT, and MR: (1) significant increase in accuracy compared to the state-of-the-art (e.g., area under the curve boost of 3% to 7% for detection of abnormalities from chest radiography scans and hemorrhage detection on brain CT); (2) acceleration of model convergence during training by up to 85% compared with using no pretraining (e.g., 83% when training a model for detection of brain metastases in MR scans); and (3) increase in robustness to various image augmentations, such as intensity variations, rotations or scaling reflective of data variation seen in the field. Conclusions The proposed approach enables large gains in accuracy and robustness on challenging image assessment problems. The improvement is significant compared with other state-of-the-art approaches trained on medical or vision images (e.g., ImageNet).
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Affiliation(s)
- Florin C. Ghesu
- Siemens Healthineers, Digital Technology and Innovation, Princeton, New Jersey, United States
| | - Bogdan Georgescu
- Siemens Healthineers, Digital Technology and Innovation, Princeton, New Jersey, United States
| | - Awais Mansoor
- Siemens Healthineers, Digital Technology and Innovation, Princeton, New Jersey, United States
| | - Youngjin Yoo
- Siemens Healthineers, Digital Technology and Innovation, Princeton, New Jersey, United States
| | - Dominik Neumann
- Siemens Healthineers, Digital Technology and Innovation, Erlangen, Germany
| | - Pragneshkumar Patel
- Siemens Healthineers, Digital Technology and Innovation, Princeton, New Jersey, United States
| | | | - James M. Balter
- University of Michigan, Department of Radiation Oncology, Ann Arbor, Michigan, United States
| | - Yue Cao
- University of Michigan, Department of Radiation Oncology, Ann Arbor, Michigan, United States
| | - Sasa Grbic
- Siemens Healthineers, Digital Technology and Innovation, Princeton, New Jersey, United States
| | - Dorin Comaniciu
- Siemens Healthineers, Digital Technology and Innovation, Princeton, New Jersey, United States
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Weikert T, Friebe L, Wilder-Smith A, Yang S, Sperl JI, Neumann D, Balachandran A, Bremerich J, Sauter AW. Automated quantification of airway wall thickness on chest CT using retina U-Nets - Performance evaluation and application to a large cohort of chest CTs of COPD patients. Eur J Radiol 2022; 155:110460. [PMID: 35963191 DOI: 10.1016/j.ejrad.2022.110460] [Citation(s) in RCA: 3] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2022] [Revised: 07/17/2022] [Accepted: 07/31/2022] [Indexed: 12/24/2022]
Abstract
PURPOSE Airway wall thickening is a consequence of chronic inflammatory processes and usually only qualitatively described in CT radiology reports. The purpose of this study is to automatically quantify airway wall thickness in multiple airway generations and assess the diagnostic potential of this parameter in a large cohort of patients with Chronic Obstructive Pulmonary Disease (COPD). MATERIALS AND METHODS This retrospective, single-center study included a series of unenhanced chest CTs. Inclusion criteria were the mentioning of an explicit COPD GOLD stage in the written radiology report and time period (01/2019-12/2021). A control group included chest CTs with completely unremarkable lungs according to the report. The DICOM images of all cases (axial orientation; slice-thickness: 1 mm; soft-tissue kernel) were processed by an AI algorithm pipeline consisting of (A) a 3D-U-Net for det detection and tracing of the bronchial tree centerlines (B) extraction of image patches perpendicular to the centerlines of the bronchi, and (C) a 2D U-Net for segmentation of airway walls on those patches. The performance of centerline detection and wall segmentation was assessed. The imaging parameter average wall thickness was calculated for bronchus generations 3-8 (AWT3-8) across the lungs. Mean AWT3-8 was compared between five groups (control, COPD Gold I-IV) using non-parametric statistics. Furthermore, the established emphysema score %LAV-950 was calculated and used to classify scans (normal vs. COPD) alone and in combination with AWT3-8. RESULTS: A total of 575 chest CTs were processed. Algorithm performance was very good (airway centerline detection sensitivity: 86.9%; airway wall segmentation Dice score: 0.86). AWT3-8 was statistically significantly greater in COPD patients compared to controls (2.03 vs. 1.87 mm, p < 0.001) and increased with COPD stage. The classifier that combined %LAV-950 and AWT3-8 was superior to the classifier using only %LAV-950 (AUC = 0.92 vs. 0.79). CONCLUSION Airway wall thickness increases in patients suffering from COPD and is automatically quantifiable. AWT3-8 could become a CT imaging parameter in COPD complementing the established emphysema biomarker %LAV-950. CLINICAL RELEVANCE STATEMENT Quantitative measurements considering the complete visible bronchial tree instead of qualitative description could enhance radiology reports, allow for precise monitoring of disease progression and diagnosis of early stages of disease.
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Affiliation(s)
- Thomas Weikert
- Department of Radiology, University Hospital Basel, University of Basel, Petersgraben 4, 4031 Basel, Switzerland.
| | - Liene Friebe
- Department of Radiology, University Hospital Basel, University of Basel, Petersgraben 4, 4031 Basel, Switzerland
| | - Adrian Wilder-Smith
- Department of Radiology, University Hospital Basel, University of Basel, Petersgraben 4, 4031 Basel, Switzerland
| | - Shan Yang
- Department of Radiology, University Hospital Basel, University of Basel, Petersgraben 4, 4031 Basel, Switzerland
| | | | - Dominik Neumann
- Siemens Healthineers, Henkestrasse 127, 91052 Erlangen, Germany
| | | | - Jens Bremerich
- Department of Radiology, University Hospital Basel, University of Basel, Petersgraben 4, 4031 Basel, Switzerland
| | - Alexander W Sauter
- Department of Radiology, University Hospital Basel, University of Basel, Petersgraben 4, 4031 Basel, Switzerland
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4
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Venker CE, Neumann D, Aladé F. Visual perceptual salience and novel referent selection in children with and without autism spectrum disorder. Autism Dev Lang Impair 2022; 7:23969415221085476. [PMID: 36382081 PMCID: PMC9620699 DOI: 10.1177/23969415221085476] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
BACKGROUND & AIMS Many young children with autism spectrum disorder (ASD) demonstrate striking delays in early vocabulary development. Experimental studies that teach the meanings of novel nonwords can determine the effects of linguistic and attentional factors. One factor that may affect novel referent selection in children with ASD is visual perceptual salience-how interesting (i.e., striking) stimuli are on the basis of their visual properties. The goal of the current study was to determine how the perceptual salience of objects affected novel referent selection in children with ASD and children who are typically developing (TD) of similar ages (mean age 3-4 years). METHODS Using a screen-based experimental paradigm, children were taught the names of four unfamiliar objects: two high-salience objects and two low-salience objects. Their comprehension of the novel words was assessed in low-difficulty and high-difficulty trials. Gaze location was determined from video by trained research assistants. RESULTS Contrary to initial predictions, findings indicated that high perceptual salience disrupted novel referent selection in the children with ASD but facilitated attention to the target object in age-matched TD peers. The children with ASD showed no significant evidence of successful novel referent selection in the high-difficulty trials. Exploratory reaction time analyses suggested that the children with autism showed "stickier" attention-had more difficulty disengaging (i.e., looking away)-from high-salience distracter images than low-salience distracter images, even though the two images were balanced in salience for any given test trial. CONCLUSIONS AND CLINICAL IMPLICATIONS These findings add to growing evidence that high perceptual salience has the potential to disrupt novel referent selection in children with ASD. These results underscore the complexity of novel referent selection and highlight the importance of taking the immediate testing context into account. In particular, it is important to acknowledge that screen-based assessments and screen-based learning activities used with children with ASD are not immune to the effects of lower level visual features, such as perceptual salience.
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Affiliation(s)
- Courtney E. Venker
- Courtney E. Venker, Michigan State
University, College of Communication Arts and Sciences, Dept. of Communicative
Sciences and Disorders, East Lansing, MI, USA.
| | - Dominik Neumann
- Leibniz-Institut für
Wissensmedien (IWM), Tübingen, Germany, Tubingen, Germany
| | - Fashina Aladé
- Department of Advertising and Public Relations,
College of Communication Arts and Sciences, Michigan State
University, East Lansing, MI, USA
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5
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Malka R, Kolomansky A, Ezra JB, Neumann D, Mittelman M, Oster H. Topic: AS04-MDS Biology and Pathogenesis/AS04i-Microenvironment and stem cell niche. Leuk Res 2021. [DOI: 10.1016/j.leukres.2021.106681.35] [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: 10/20/2022]
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6
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Venker CE, Mathée J, Neumann D, Edwards J, Saffran J, Ellis Weismer S. Competing Perceptual Salience in a Visual Word Recognition Task Differentially Affects Children With and Without Autism Spectrum Disorder. Autism Res 2021; 14:1147-1162. [PMID: 33372400 PMCID: PMC8192461 DOI: 10.1002/aur.2457] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Revised: 11/30/2020] [Accepted: 12/01/2020] [Indexed: 11/11/2022]
Abstract
Differences in visual attention have long been recognized as a central characteristic of autism spectrum disorder (ASD). Regardless of social content, children with ASD show a strong preference for perceptual salience-how interesting (i.e., striking) certain stimuli are, based on their visual properties (e.g., color, geometric patterning). However, we do not know the extent to which attentional allocation preferences for perceptual salience persist when they compete with top-down, linguistic information. This study examined the impact of competing perceptual salience on visual word recognition in 17 children with ASD (mean age 31 months) and 17 children with typical development (mean age 20 months) matched on receptive language skills. A word recognition task presented two images on a screen, one of which was named (e.g., Find the bowl!). On Neutral trials, both images had high salience (i.e., were colorful and had geometric patterning). On Competing trials, the distracter image had high salience but the target image had low salience, creating competition between bottom-up (i.e., salience-driven) and top-down (i.e., language-driven) processes. Though both groups of children showed word recognition in an absolute sense, competing perceptual salience significantly decreased attention to the target only in the children with ASD. These findings indicate that perceptual properties of objects can disrupt attention to relevant information in children with ASD, which has implications for supporting their language development. Findings also demonstrate that perceptual salience affects attentional allocation preferences in children with ASD, even in the absence of social stimuli. LAY SUMMARY: This study found that visually striking objects distract young children with autism spectrum disorder (ASD) from looking at relevant (but less striking) objects named by an adult. Language-matched, younger children with typical development were not significantly affected by this visual distraction. Though visual distraction could have cascading negative effects on language development in children with ASD, learning opportunities that build on children's focus of attention are likely to support positive outcomes.
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Affiliation(s)
- Courtney E Venker
- Department of Communicative Sciences and Disorders, Michigan State University, Michigan, USA
| | - Janine Mathée
- Waisman Center and Department of Communication Sciences and Disorders, University of Wisconsin-Madison, Madison, Wisconsin, USA
| | - Dominik Neumann
- College of Communication Arts and Sciences, Michigan State University, East Lansing, Michigan, USA
| | - Jan Edwards
- Waisman Center and Department of Communication Sciences and Disorders, University of Wisconsin-Madison, Madison, Wisconsin, USA
- Department of Hearing and Speech Sciences, Maryland Science Center, University of Maryland, College Park, Maryland, USA
| | - Jenny Saffran
- Waisman Center and Department of Psychology, University of Wisconsin-Madison, Madison, Wisconsin, USA
| | - Susan Ellis Weismer
- Waisman Center and Department of Communication Sciences and Disorders, University of Wisconsin-Madison, Madison, Wisconsin, USA
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7
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Sun A, Simsek Papur O, Dirkx E, Wong L, Sips T, Wang S, Strzelecka A, Nabben M, Glatz JFC, Neumann D, Luiken JJFP. Phosphatidylinositol 4-kinase IIIβ mediates contraction-induced GLUT4 translocation and shows its anti-diabetic action in cardiomyocytes. Cell Mol Life Sci 2020; 78:2839-2856. [PMID: 33090289 PMCID: PMC8004495 DOI: 10.1007/s00018-020-03669-7] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2020] [Revised: 08/31/2020] [Accepted: 10/05/2020] [Indexed: 01/15/2023]
Abstract
In the diabetic heart, long-chain fatty acid (LCFA) uptake is increased at the expense of glucose uptake. This metabolic shift ultimately leads to insulin resistance and a reduced cardiac function. Therefore, signaling kinases that mediate glucose uptake without simultaneously stimulating LCFA uptake could be considered attractive anti-diabetic targets. Phosphatidylinositol-4-kinase-IIIβ (PI4KIIIβ) is a lipid kinase downstream of protein kinase D1 (PKD1) that mediates Golgi-to-plasma membrane vesicular trafficking in HeLa-cells. In this study, we evaluated whether PI4KIIIβ is involved in myocellular GLUT4 translocation induced by contraction or oligomycin (an F1F0-ATP synthase inhibitor that activates contraction-like signaling). Pharmacological targeting, with compound MI14, or genetic silencing of PI4KIIIβ inhibited contraction/oligomycin-stimulated GLUT4 translocation and glucose uptake in cardiomyocytes but did not affect CD36 translocation nor LCFA uptake. Addition of the PI4KIIIβ enzymatic reaction product phosphatidylinositol-4-phosphate restored oligomycin-stimulated glucose uptake in the presence of MI14. PI4KIIIβ activation by PKD1 involves Ser294 phosphorylation and altered its localization with unchanged enzymatic activity. Adenoviral PI4KIIIβ overexpression stimulated glucose uptake, but did not activate hypertrophic signaling, indicating that unlike PKD1, PI4KIIIβ is selectively involved in GLUT4 translocation. Finally, PI4KIIIβ overexpression prevented insulin resistance and contractile dysfunction in lipid-overexposed cardiomyocytes. Together, our studies identify PI4KIIIβ as positive and selective regulator of GLUT4 translocation in response to contraction-like signaling, suggesting PI4KIIIβ as a promising target to rescue defective glucose uptake in diabetics.
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Affiliation(s)
- A Sun
- Department of Genetics and Cell Biology, Faculty of Health, Medicine and Life Sciences, Maastricht University Medical Center+, 6200 MD, Maastricht, The Netherlands
| | - O Simsek Papur
- Department of Genetics and Cell Biology, Faculty of Health, Medicine and Life Sciences, Maastricht University Medical Center+, 6200 MD, Maastricht, The Netherlands
| | - E Dirkx
- Department of Genetics and Cell Biology, Faculty of Health, Medicine and Life Sciences, Maastricht University Medical Center+, 6200 MD, Maastricht, The Netherlands
| | - L Wong
- Department of Genetics and Cell Biology, Faculty of Health, Medicine and Life Sciences, Maastricht University Medical Center+, 6200 MD, Maastricht, The Netherlands.,Department of Clinical Genetics, Faculty of Health, Medicine and Life Sciences, Maastricht University Medical Center+, 6200 MD, Maastricht, The Netherlands
| | - T Sips
- Department of Genetics and Cell Biology, Faculty of Health, Medicine and Life Sciences, Maastricht University Medical Center+, 6200 MD, Maastricht, The Netherlands
| | - S Wang
- Department of Genetics and Cell Biology, Faculty of Health, Medicine and Life Sciences, Maastricht University Medical Center+, 6200 MD, Maastricht, The Netherlands
| | - A Strzelecka
- Department of Genetics and Cell Biology, Faculty of Health, Medicine and Life Sciences, Maastricht University Medical Center+, 6200 MD, Maastricht, The Netherlands
| | - M Nabben
- Department of Genetics and Cell Biology, Faculty of Health, Medicine and Life Sciences, Maastricht University Medical Center+, 6200 MD, Maastricht, The Netherlands.,Department of Clinical Genetics, Faculty of Health, Medicine and Life Sciences, Maastricht University Medical Center+, 6200 MD, Maastricht, The Netherlands.,CARIM School for Cardiovascular Diseases, Maastricht, The Netherlands
| | - J F C Glatz
- Department of Genetics and Cell Biology, Faculty of Health, Medicine and Life Sciences, Maastricht University Medical Center+, 6200 MD, Maastricht, The Netherlands.,Department of Clinical Genetics, Faculty of Health, Medicine and Life Sciences, Maastricht University Medical Center+, 6200 MD, Maastricht, The Netherlands
| | - D Neumann
- Department of Pathology, Faculty of Health, Medicine and Life Sciences, Maastricht University Medical Center+, 6200 MD, Maastricht, The Netherlands.,CARIM School for Cardiovascular Diseases, Maastricht, The Netherlands
| | - J J F P Luiken
- Department of Genetics and Cell Biology, Faculty of Health, Medicine and Life Sciences, Maastricht University Medical Center+, 6200 MD, Maastricht, The Netherlands.
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8
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Soe K, Beard H, Neumann D, Trim PJ, Duplock S, Snel MF, Hopwood JJ, Hemsley KM. Early disease course is unaltered in mucopolysaccharidosis type IIIA (MPS IIIA) mice lacking α-synuclein. Neuropathol Appl Neurobiol 2019; 45:715-731. [PMID: 30907009 DOI: 10.1111/nan.12548] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2018] [Accepted: 03/19/2019] [Indexed: 11/26/2022]
Abstract
BACKGROUND Sanfilippo syndrome (mucopolysaccharidosis type IIIA; MPS IIIA) is an inherited paediatric-onset neurodegenerative disorder caused by the lysosomal deficiency of sulphamidase with subsequent accumulation of heparan sulphate. The pathological mechanisms responsible for clinical disease are unknown; however, intraneuronal accumulation of aggregation-prone proteins such as α-synuclein, phosphorylated tau and amyloid precursor protein suggests inefficient intracellular trafficking and lysosomal degradation. AIM To investigate the contribution the accumulating α-synuclein plays in early symptom emergence that is, impaired cognition, reduced anxiety and motor deficits, first detectable between 3-5 months of age. METHODS We have crossed congenic MPS IIIA mice with α-synuclein-deficient (Sncatm1Rosl /J) mice and evaluated phenotype and brain disease lesions. RESULTS In a battery of behavioural tests performed on mice aged 12-22 weeks, we were unable to differentiate α-synuclein-deficient MPS IIIA mice from those with one or both copies of the α-synuclein gene; all three affected genotypes were significantly impaired in test performance when compared to wild-type littermates. Histological studies revealed that the rate, location and nature of deposition of other proteinaceous lesions, the disruption to endolysosomal protein expression and the inflammatory response seen in the brain of α-synuclein-deficient MPS IIIA mice reflected that seen in MPS IIIA mice homo- or heterozygous for α-synuclein. CONCLUSION Deletion and/or deficiency of α-synuclein does not influence clinical and neuropathological disease progression in murine MPS IIIA, demonstrating that in and of itself, this protein does not initiate the cognitive and motor symptoms that occur in the first 5 months of life in MPS IIIA mice.
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Affiliation(s)
- K Soe
- Hopwood Centre for Neurobiology (HCN), South Australian Health and Medical Research Institute (SAHMRI), Adelaide, SA, Australia.,Department of Paediatrics, University of Adelaide, Adelaide, SA, Australia
| | - H Beard
- Hopwood Centre for Neurobiology (HCN), South Australian Health and Medical Research Institute (SAHMRI), Adelaide, SA, Australia
| | - D Neumann
- Hopwood Centre for Neurobiology (HCN), South Australian Health and Medical Research Institute (SAHMRI), Adelaide, SA, Australia
| | - P J Trim
- Hopwood Centre for Neurobiology (HCN), South Australian Health and Medical Research Institute (SAHMRI), Adelaide, SA, Australia.,Department of Paediatrics, University of Adelaide, Adelaide, SA, Australia
| | - S Duplock
- Hopwood Centre for Neurobiology (HCN), South Australian Health and Medical Research Institute (SAHMRI), Adelaide, SA, Australia
| | - M F Snel
- Hopwood Centre for Neurobiology (HCN), South Australian Health and Medical Research Institute (SAHMRI), Adelaide, SA, Australia.,Department of Paediatrics, University of Adelaide, Adelaide, SA, Australia
| | - J J Hopwood
- Hopwood Centre for Neurobiology (HCN), South Australian Health and Medical Research Institute (SAHMRI), Adelaide, SA, Australia.,Department of Paediatrics, University of Adelaide, Adelaide, SA, Australia
| | - K M Hemsley
- Hopwood Centre for Neurobiology (HCN), South Australian Health and Medical Research Institute (SAHMRI), Adelaide, SA, Australia.,Department of Paediatrics, University of Adelaide, Adelaide, SA, Australia
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9
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Goubergrits L, Hellmeier F, Neumann D, Mihalef V, Gulsun MA, Chinali M, Secinaro A, Runte K, Schubert S, Berger F, Kuehne T, Hennemuth A, Kelm M. Patient-specific requirements and clinical validation of MRI-based pressure mapping: A two-center study in patients with aortic coarctation. J Magn Reson Imaging 2019. [DOI: 10.1002/jmri.26633] [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: 11/06/2022] Open
Affiliation(s)
- Leonid Goubergrits
- Institute for Computational and Imaging Science in Cardiovascular Medicine, Charité; Universitätsmedizin Berlin; Berlin Germany
| | - Florian Hellmeier
- Institute for Computational and Imaging Science in Cardiovascular Medicine, Charité; Universitätsmedizin Berlin; Berlin Germany
| | - Dominik Neumann
- Medical Imaging Technologies, Siemens Healthcare; Erlangen Germany
| | - Viorel Mihalef
- Medical Imaging Technologies, Siemens Medical Solutions; Princeton New Jersey USA
| | - Mehmet A. Gulsun
- Medical Imaging Technologies, Siemens Medical Solutions; Princeton New Jersey USA
| | - Marcello Chinali
- Department of Cardiology and Cardiac Surgery; Bambino Gesú Children's Research Hospital; Rome Italy
| | - Aurelio Secinaro
- Department of Imaging; Bambino Gesú Children's Research Hospital; Rome Italy
| | - Kilian Runte
- Institute for Computational and Imaging Science in Cardiovascular Medicine, Charité; Universitätsmedizin Berlin; Berlin Germany
- German Heart Center Berlin, Department of Congenital Heart Disease; Unit of Cardiovascular Imaging; Berlin Germany
| | - Stephan Schubert
- German Heart Center Berlin, Department of Congenital Heart Disease; Unit of Cardiovascular Imaging; Berlin Germany
| | - Felix Berger
- German Heart Center Berlin, Department of Congenital Heart Disease; Unit of Cardiovascular Imaging; Berlin Germany
- Charité, Universitätsmedizin Berlin, Pediatric Cardiology; Berlin Germany
- DZHK (German Centre for Cardiovascular Research), Partner Site Berlin; Berlin Germany
| | - Titus Kuehne
- Institute for Computational and Imaging Science in Cardiovascular Medicine, Charité; Universitätsmedizin Berlin; Berlin Germany
- DZHK (German Centre for Cardiovascular Research), Partner Site Berlin; Berlin Germany
| | - Anja Hennemuth
- Institute for Computational and Imaging Science in Cardiovascular Medicine, Charité; Universitätsmedizin Berlin; Berlin Germany
| | - Marcus Kelm
- Institute for Computational and Imaging Science in Cardiovascular Medicine, Charité; Universitätsmedizin Berlin; Berlin Germany
- German Heart Center Berlin, Department of Congenital Heart Disease; Unit of Cardiovascular Imaging; Berlin Germany
- DZHK (German Centre for Cardiovascular Research), Partner Site Berlin; Berlin Germany
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Goubergrits L, Hellmeier F, Neumann D, Mihalef V, Gulsun MA, Chinali M, Secinaro A, Runte K, Schubert S, Berger F, Kuehne T, Hennemuth A, Kelm M. Patient-specific requirements and clinical validation of MRI-based pressure mapping: A two-center study in patients with aortic coarctation. J Magn Reson Imaging 2018; 49:81-89. [DOI: 10.1002/jmri.26230] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2018] [Accepted: 05/25/2018] [Indexed: 11/09/2022] Open
Affiliation(s)
- Leonid Goubergrits
- Institute for Computational and Imaging Science in Cardiovascular Medicine, Charité; Universitätsmedizin Berlin; Berlin Germany
| | - Florian Hellmeier
- Institute for Computational and Imaging Science in Cardiovascular Medicine, Charité; Universitätsmedizin Berlin; Berlin Germany
| | - Dominik Neumann
- Medical Imaging Technologies, Siemens Healthcare; Erlangen Germany
| | - Viorel Mihalef
- Medical Imaging Technologies, Siemens Medical Solutions; Princeton New Jersey USA
| | - Mehmet A. Gulsun
- Medical Imaging Technologies, Siemens Medical Solutions; Princeton New Jersey USA
| | - Marcello Chinali
- Department of Cardiology and Cardiac Surgery; Bambino Gesú Children's Research Hospital; Rome Italy
| | - Aurelio Secinaro
- Department of Imaging; Bambino Gesú Children's Research Hospital; Rome Italy
| | - Kilian Runte
- Institute for Computational and Imaging Science in Cardiovascular Medicine, Charité; Universitätsmedizin Berlin; Berlin Germany
- German Heart Center Berlin, Department of Congenital Heart Disease; Unit of Cardiovascular Imaging; Berlin Germany
| | - Stephan Schubert
- German Heart Center Berlin, Department of Congenital Heart Disease; Unit of Cardiovascular Imaging; Berlin Germany
| | - Felix Berger
- German Heart Center Berlin, Department of Congenital Heart Disease; Unit of Cardiovascular Imaging; Berlin Germany
- Charité, Universitätsmedizin Berlin, Pediatric Cardiology; Berlin Germany
- DZHK (German Centre for Cardiovascular Research), Partner Site Berlin; Berlin Germany
| | - Titus Kuehne
- Institute for Computational and Imaging Science in Cardiovascular Medicine, Charité; Universitätsmedizin Berlin; Berlin Germany
- DZHK (German Centre for Cardiovascular Research), Partner Site Berlin; Berlin Germany
| | - Anja Hennemuth
- Institute for Computational and Imaging Science in Cardiovascular Medicine, Charité; Universitätsmedizin Berlin; Berlin Germany
| | - Marcus Kelm
- Institute for Computational and Imaging Science in Cardiovascular Medicine, Charité; Universitätsmedizin Berlin; Berlin Germany
- German Heart Center Berlin, Department of Congenital Heart Disease; Unit of Cardiovascular Imaging; Berlin Germany
- DZHK (German Centre for Cardiovascular Research), Partner Site Berlin; Berlin Germany
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Gorczynski RM, Alexander C, Brandenburg K, Chen Z, Heini A, Neumann D, Mach JP, Rietschel ET, Terskikh A, Ulmer AJ, Yu K, Zahringer U, Khatri I. Corrigendum to "An altered REDOX environment, assisted by over-expression of fetal hemoglobins, protects from inflammatory colitis and reduces inflammatory cytokine expression" [Int. Immunopharmacol. 50 (2017) 69-76]. Int Immunopharmacol 2018; 59:414. [PMID: 29681495 DOI: 10.1016/j.intimp.2018.04.023] [Citation(s) in RCA: 1] [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: 10/17/2022]
Affiliation(s)
- R M Gorczynski
- Institute of Medical Sciences, University of Toronto, Toronto, Canada.
| | - C Alexander
- Research Center Borstel, Leibniz-Center for Medicine and Biosciences, Borstel, Germany
| | - K Brandenburg
- Research Center Borstel, Leibniz-Center for Medicine and Biosciences, Borstel, Germany
| | - Z Chen
- Institute of Medical Sciences, University of Toronto, Toronto, Canada
| | - A Heini
- Clinique La Prairie, Clarens, Montreux, Switzerland
| | - D Neumann
- Clinique La Prairie, Clarens, Montreux, Switzerland
| | - J P Mach
- Department of Biochemistry, University of Lausanne, Switzerland
| | | | - A Terskikh
- Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA, USA
| | - A J Ulmer
- Research Center Borstel, Leibniz-Center for Medicine and Biosciences, Borstel, Germany
| | - Kai Yu
- Institute of Medical Sciences, University of Toronto, Toronto, Canada
| | - U Zahringer
- Research Center Borstel, Leibniz-Center for Medicine and Biosciences, Borstel, Germany
| | - I Khatri
- Institute of Medical Sciences, University of Toronto, Toronto, Canada
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Kremláček J, Vitvarová T, Neumann D. 15-Sensory and cognitive processing of visual stimuli in adolescents with type 1 diabetes mellitus: Electrophysiological study. Clin Neurophysiol 2018. [DOI: 10.1016/j.clinph.2018.01.035] [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: 11/16/2022]
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13
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Neumann D, Kaleta EF, Lierz M. Semen collection and artificial insemination in cockatiels (Nymphicus hollandicus) – A potential model for psittacines. Tierarztl Prax Ausg K 2018. [DOI: 10.1055/s-0038-1623695] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
Summary
Study: Since many psittacine species are endangered and also rare in captivity, the number of offspring produced from breeding is crucial. Many potential breeding birds in species conservation programs are force-paired, and the eggs of many clutches are frequently infertile. Furthermore, male infertility is a common problem. The use of artificial insemination may increase the number of fertile eggs. Material and methods: In this study, 32 cockatiels (Nymphicus hollandicus) were divided into two groups. In one group, the males were endoscopically sterilised. The males of the other group were used as semen donors. After collection using a novel massage technique, semen samples were examined microscopically to assess contamination and quality. Samples with medium to high sperm concentrations, medium to high motility and no contaminants were used for intracloacal artificial insemination of hens in the group with sterile males. Results: In total, 74.2% of all attempts to collect semen were successful. Insemination resulted in fertilisation of 17 of 23 eggs (73.9%), which was slightly lower than the natural fertilisation rate (88.4%). No negative effects were observed on the oviposition interval of the inseminated hens throughout the entire study. Clinical relevance: Easily applicable in veterinary practice, this study demonstrates that the use of artificial insemination may be a valuable tool to address reproductive failure of psittacines in breeding projects.
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Itu L, Neumann D, Mihalef V, Meister F, Kramer M, Gulsun M, Kelm M, Kühne T, Sharma P. Non-invasive assessment of patient-specific aortic haemodynamics from four-dimensional flow MRI data. Interface Focus 2017; 8:20170006. [PMID: 29285343 DOI: 10.1098/rsfs.2017.0006] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
We introduce a parameter estimation framework for automatically and robustly personalizing aortic haemodynamic computations from four-dimensional magnetic resonance imaging data. The framework is based on a reduced-order multiscale fluid-structure interaction blood flow model, and on two calibration procedures. First, Windkessel parameters of the outlet boundary conditions are personalized by solving a system of nonlinear equations. Second, the regional mechanical wall properties of the aorta are personalized by employing a nonlinear least-squares minimization method. The two calibration procedures are run sequentially and iteratively until both procedures have converged. The parameter estimation framework was successfully evaluated on 15 datasets from patients with aortic valve disease. On average, only 1.27 ± 0.96 and 7.07 ± 1.44 iterations were required to personalize the outlet boundary conditions and the regional mechanical wall properties, respectively. Overall, the computational model was in close agreement with the clinical measurements used as objectives (pressures, flow rates, cross-sectional areas), with a maximum error of less than 1%. Given its level of automation, robustness and the short execution time (6.2 ± 1.2 min on a standard hardware configuration), the framework is potentially well suited for a clinical setting.
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Affiliation(s)
- Lucian Itu
- Corporate Technology, Siemens SRL, Brasov, Romania.,Department of Automation and Information Technology, Transilvania University of Brasov, Brasov, Romania
| | - Dominik Neumann
- Medical Imaging Technologies, Siemens Healthcare GmbH, Erlangen, Germany
| | - Viorel Mihalef
- Medical Imaging Technologies, Siemens Healthcare, Princeton, NJ, USA
| | - Felix Meister
- Medical Imaging Technologies, Siemens Healthcare GmbH, Erlangen, Germany
| | - Martin Kramer
- Medical Imaging Technologies, Siemens Healthcare GmbH, Erlangen, Germany
| | - Mehmet Gulsun
- Medical Imaging Technologies, Siemens Healthcare, Princeton, NJ, USA
| | - Marcus Kelm
- Department of Congenital Heart Disease, Unit of Cardiovascular Imaging, German Heart Center, Berlin, Germany
| | - Titus Kühne
- Department of Congenital Heart Disease, Unit of Cardiovascular Imaging, German Heart Center, Berlin, Germany
| | | | - Puneet Sharma
- Medical Imaging Technologies, Siemens Healthcare, Princeton, NJ, USA
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16
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Neumann D, Borisenko AV, Coddington JA, Häuser CL, Butler CR, Casino A, Vogel JC, Haszprunar G, Giere P. Global biodiversity research tied up by juridical interpretations of access and benefit sharing. ORG DIVERS EVOL 2017. [DOI: 10.1007/s13127-017-0347-1] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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17
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Gorczynski R, Alexander C, Brandenburg K, Chen Z, Heini A, Neumann D, Mach J, Rietschel E, Tersikh A, Ulmer A, Yu K, Zahringer U, Khatri I. An altered REDOX environment, assisted by over-expression of fetal hemoglobins, protects from inflammatory colitis and reduces inflammatory cytokine expression. Int Immunopharmacol 2017. [DOI: 10.1016/j.intimp.2017.06.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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18
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Oedingen C, Krauth C, Girndt M, Mau W, Neumann D. The Choice of Renal Replacement Therapy (CORETH) Project: Patient Participation, Quality of Life and Economic Consequences. Das Gesundheitswesen 2017. [DOI: 10.1055/s-0037-1605761] [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: 10/18/2022]
Affiliation(s)
- C Oedingen
- Medizinische Hochschule Hannover, Institut für Epidemiologie, Sozialmedizin und Gesundheitssystemforschung, Hannover
| | - C Krauth
- Medizinische Hochschule Hannover, Institut für Epidemiologie, Sozialmedizin und Gesundheitssystemforschung, Hannover
| | - M Girndt
- Martin-Luther-Universität Halle-Wittenberg, Klinik für Innere Medizin II, Halle (Saale)
| | - W Mau
- Martin-Luther-Universität Halle-Wittenberg, Institut für Rehabilitationsmedizin, Halle (Saale)
| | - D Neumann
- Martin-Luther-Universität Halle-Wittenberg, Institut für Rehabilitationsmedizin, Halle (Saale)
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Grbic S, Easley TF, Mansi T, Bloodworth CH, Pierce EL, Voigt I, Neumann D, Krebs J, Yuh DD, Jensen MO, Comaniciu D, Yoganathan AP. Personalized mitral valve closure computation and uncertainty analysis from 3D echocardiography. Med Image Anal 2017; 35:238-249. [DOI: 10.1016/j.media.2016.03.011] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2015] [Revised: 03/22/2016] [Accepted: 03/30/2016] [Indexed: 10/21/2022]
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20
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Del Poggetto E, Tanturli M, Ben-Califa N, Gozzini A, Tusa I, Cheloni G, Marzi I, Cipolleschi MG, Kashman Y, Neumann D, Rovida E, Dello Sbarba P. Salarin C inhibits the maintenance of chronic myeloid leukemia progenitor cells. Cell Cycle 2016; 14:3146-54. [PMID: 26291130 DOI: 10.1080/15384101.2015.1078029] [Citation(s) in RCA: 8] [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: 10/23/2022] Open
Abstract
We previously showed that incubation of chronic myeloid leukemia (CML) cells in very low oxygen selects a cell subset where the oncogenetic BCR/Abl protein is suppressed and which is thereby refractory to tyrosine kinase inhibitors used for CML therapy. In this study, salarin C, an anticancer macrolide extracted from the Fascaplysinopsis sponge, was tested as for its activity on CML cells, especially after their incubation in atmosphere at 0.1% oxygen. Salarin C induced mitotic cycle arrest, apoptosis and DNA damage. Salarin C also concentration-dependently inhibited the maintenance of stem cell potential in cultures in low oxygen of either CML cell lines or primary cells. Surprisingly, the drug also concentration-dependently enforced the maintenance of BCR/Abl signaling in low oxygen, an effect which was paralleled by the rescue of sensitivity of stem cell potential to IM. These results suggest a potential use of salarin C for the suppression of CML cells refractory to tyrosine kinase inhibitors.
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Affiliation(s)
- E Del Poggetto
- a Department of Experimental and Clinical Biomedical Sciences "Mario Serio" ; Universita degli Studi di Firenze ; Florence , Italy
| | - M Tanturli
- a Department of Experimental and Clinical Biomedical Sciences "Mario Serio" ; Universita degli Studi di Firenze ; Florence , Italy
| | - N Ben-Califa
- b Department of Cell and Developmental Biology; Sackler Faculty of Medicine ; Tel Aviv University ; Tel Aviv , Israel
| | - A Gozzini
- c Hematology Unit; "Careggi" University Hospital ; Florence , Italy
| | - I Tusa
- a Department of Experimental and Clinical Biomedical Sciences "Mario Serio" ; Universita degli Studi di Firenze ; Florence , Italy
| | - G Cheloni
- a Department of Experimental and Clinical Biomedical Sciences "Mario Serio" ; Universita degli Studi di Firenze ; Florence , Italy
| | - I Marzi
- a Department of Experimental and Clinical Biomedical Sciences "Mario Serio" ; Universita degli Studi di Firenze ; Florence , Italy
| | - M G Cipolleschi
- a Department of Experimental and Clinical Biomedical Sciences "Mario Serio" ; Universita degli Studi di Firenze ; Florence , Italy
| | - Y Kashman
- d School of Chemistry ; Tel Aviv University ; Tel Aviv , Israel
| | - D Neumann
- b Department of Cell and Developmental Biology; Sackler Faculty of Medicine ; Tel Aviv University ; Tel Aviv , Israel
| | - E Rovida
- a Department of Experimental and Clinical Biomedical Sciences "Mario Serio" ; Universita degli Studi di Firenze ; Florence , Italy
| | - P Dello Sbarba
- a Department of Experimental and Clinical Biomedical Sciences "Mario Serio" ; Universita degli Studi di Firenze ; Florence , Italy
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Amr A, Kayvanpour E, Sedaghat-Hamedani F, Passerini T, Mihalef V, Lai A, Neumann D, Georgescu B, Buss S, Mereles D, Zitron E, Posch AE, Würstle M, Mansi T, Katus HA, Meder B. Personalized Computer Simulation of Diastolic Function in Heart Failure. Genomics Proteomics Bioinformatics 2016; 14:244-52. [PMID: 27477449 PMCID: PMC4996856 DOI: 10.1016/j.gpb.2016.04.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/29/2016] [Revised: 04/21/2016] [Accepted: 04/26/2016] [Indexed: 01/14/2023]
Abstract
The search for a parameter representing left ventricular relaxation from non-invasive and invasive diagnostic tools has been extensive, since heart failure (HF) with preserved ejection fraction (HF-pEF) is a global health problem. We explore here the feasibility using patient-specific cardiac computer modeling to capture diastolic parameters in patients suffering from different degrees of systolic HF. Fifty eight patients with idiopathic dilated cardiomyopathy have undergone thorough clinical evaluation, including cardiac magnetic resonance imaging (MRI), heart catheterization, echocardiography, and cardiac biomarker assessment. A previously-introduced framework for creating multi-scale patient-specific cardiac models has been applied on all these patients. Novel parameters, such as global stiffness factor and maximum left ventricular active stress, representing cardiac active and passive tissue properties have been computed for all patients. Invasive pressure measurements from heart catheterization were then used to evaluate ventricular relaxation using the time constant of isovolumic relaxation Tau (τ). Parameters from heart catheterization and the multi-scale model have been evaluated and compared to patient clinical presentation. The model parameter global stiffness factor, representing diastolic passive tissue properties, is correlated significantly across the patient population with τ. This study shows that multi-modal cardiac models can successfully capture diastolic (dys) function, a prerequisite for future clinical trials on HF-pEF.
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Affiliation(s)
- Ali Amr
- Institute for Cardiomyopathies, Department of Medicine III, University of Heidelberg, 69120 Heidelberg, Germany; German Centre for Cardiovascular Research (DZHK), Heidelberg/Mannheim, Germany
| | - Elham Kayvanpour
- Institute for Cardiomyopathies, Department of Medicine III, University of Heidelberg, 69120 Heidelberg, Germany; German Centre for Cardiovascular Research (DZHK), Heidelberg/Mannheim, Germany
| | - Farbod Sedaghat-Hamedani
- Institute for Cardiomyopathies, Department of Medicine III, University of Heidelberg, 69120 Heidelberg, Germany; German Centre for Cardiovascular Research (DZHK), Heidelberg/Mannheim, Germany
| | - Tiziano Passerini
- Siemens Healthcare, Medical Imaging Technologies, Princeton, NJ 08540, USA
| | - Viorel Mihalef
- Siemens Healthcare, Medical Imaging Technologies, Princeton, NJ 08540, USA
| | - Alan Lai
- Institute for Cardiomyopathies, Department of Medicine III, University of Heidelberg, 69120 Heidelberg, Germany
| | - Dominik Neumann
- Siemens Healthcare, Medical Imaging Technologies, Princeton, NJ 08540, USA
| | - Bogdan Georgescu
- Siemens Healthcare, Medical Imaging Technologies, Princeton, NJ 08540, USA
| | - Sebastian Buss
- Institute for Cardiomyopathies, Department of Medicine III, University of Heidelberg, 69120 Heidelberg, Germany
| | - Derliz Mereles
- Institute for Cardiomyopathies, Department of Medicine III, University of Heidelberg, 69120 Heidelberg, Germany
| | - Edgar Zitron
- Institute for Cardiomyopathies, Department of Medicine III, University of Heidelberg, 69120 Heidelberg, Germany
| | - Andreas E Posch
- Siemens Healthcare, Strategy and Innovation, 91052 Erlangen, Germany
| | | | - Tommaso Mansi
- Siemens Healthcare, Medical Imaging Technologies, Princeton, NJ 08540, USA
| | - Hugo A Katus
- Institute for Cardiomyopathies, Department of Medicine III, University of Heidelberg, 69120 Heidelberg, Germany; German Centre for Cardiovascular Research (DZHK), Heidelberg/Mannheim, Germany
| | - Benjamin Meder
- Institute for Cardiomyopathies, Department of Medicine III, University of Heidelberg, 69120 Heidelberg, Germany; German Centre for Cardiovascular Research (DZHK), Heidelberg/Mannheim, Germany.
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22
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Neumann D, Mansi T, Itu L, Georgescu B, Kayvanpour E, Sedaghat-Hamedani F, Amr A, Haas J, Katus H, Meder B, Steidl S, Hornegger J, Comaniciu D. A self-taught artificial agent for multi-physics computational model personalization. Med Image Anal 2016; 34:52-64. [PMID: 27133269 DOI: 10.1016/j.media.2016.04.003] [Citation(s) in RCA: 12] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2016] [Revised: 04/08/2016] [Accepted: 04/19/2016] [Indexed: 02/05/2023]
Abstract
Personalization is the process of fitting a model to patient data, a critical step towards application of multi-physics computational models in clinical practice. Designing robust personalization algorithms is often a tedious, time-consuming, model- and data-specific process. We propose to use artificial intelligence concepts to learn this task, inspired by how human experts manually perform it. The problem is reformulated in terms of reinforcement learning. In an off-line phase, Vito, our self-taught artificial agent, learns a representative decision process model through exploration of the computational model: it learns how the model behaves under change of parameters. The agent then automatically learns an optimal strategy for on-line personalization. The algorithm is model-independent; applying it to a new model requires only adjusting few hyper-parameters of the agent and defining the observations to match. The full knowledge of the model itself is not required. Vito was tested in a synthetic scenario, showing that it could learn how to optimize cost functions generically. Then Vito was applied to the inverse problem of cardiac electrophysiology and the personalization of a whole-body circulation model. The obtained results suggested that Vito could achieve equivalent, if not better goodness of fit than standard methods, while being more robust (up to 11% higher success rates) and with faster (up to seven times) convergence rate. Our artificial intelligence approach could thus make personalization algorithms generalizable and self-adaptable to any patient and any model.
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Affiliation(s)
- Dominik Neumann
- Medical Imaging Technologies, Siemens Healthcare GmbH, Erlangen, Germany; Pattern Recognition Lab, FAU Erlangen-Nürnberg, Erlangen, Germany.
| | - Tommaso Mansi
- Medical Imaging Technologies, Siemens Healthcare, Princeton, USA
| | - Lucian Itu
- Siemens Corporate Technology, Siemens SRL, Brasov, Romania; Transilvania University of Brasov, Brasov, Romania
| | - Bogdan Georgescu
- Medical Imaging Technologies, Siemens Healthcare, Princeton, USA
| | - Elham Kayvanpour
- Department of Internal Medicine III, University Hospital Heidelberg, Germany
| | | | - Ali Amr
- Department of Internal Medicine III, University Hospital Heidelberg, Germany
| | - Jan Haas
- Department of Internal Medicine III, University Hospital Heidelberg, Germany
| | - Hugo Katus
- Department of Internal Medicine III, University Hospital Heidelberg, Germany
| | - Benjamin Meder
- Department of Internal Medicine III, University Hospital Heidelberg, Germany
| | - Stefan Steidl
- Pattern Recognition Lab, FAU Erlangen-Nürnberg, Erlangen, Germany
| | | | - Dorin Comaniciu
- Medical Imaging Technologies, Siemens Healthcare, Princeton, USA
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23
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Ghesu FC, Georgescu B, Mansi T, Neumann D, Hornegger J, Comaniciu D. An Artificial Agent for Anatomical Landmark Detection in Medical Images. Lecture Notes in Computer Science 2016. [DOI: 10.1007/978-3-319-46726-9_27] [Citation(s) in RCA: 64] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
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24
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Jiang P, Kanzia G, Neumann D, Roider J, Dunst J. 106Ruthenium Eye Plaque Brachytherapy in the Management of Medium Sized Uveal Melanoma. Int J Radiat Oncol Biol Phys 2015. [DOI: 10.1016/j.ijrobp.2015.07.741] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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25
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Kayvanpour E, Mansi T, Sedaghat-Hamedani F, Amr A, Neumann D, Georgescu B, Seegerer P, Kamen A, Haas J, Frese KS, Irawati M, Wirsz E, King V, Buss S, Mereles D, Zitron E, Keller A, Katus HA, Comaniciu D, Meder B. Towards Personalized Cardiology: Multi-Scale Modeling of the Failing Heart. PLoS One 2015; 10:e0134869. [PMID: 26230546 PMCID: PMC4521877 DOI: 10.1371/journal.pone.0134869] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2015] [Accepted: 07/14/2015] [Indexed: 01/14/2023] Open
Abstract
BACKGROUND Despite modern pharmacotherapy and advanced implantable cardiac devices, overall prognosis and quality of life of HF patients remain poor. This is in part due to insufficient patient stratification and lack of individualized therapy planning, resulting in less effective treatments and a significant number of non-responders. METHODS AND RESULTS State-of-the-art clinical phenotyping was acquired, including magnetic resonance imaging (MRI) and biomarker assessment. An individualized, multi-scale model of heart function covering cardiac anatomy, electrophysiology, biomechanics and hemodynamics was estimated using a robust framework. The model was computed on n=46 HF patients, showing for the first time that advanced multi-scale models can be fitted consistently on large cohorts. Novel multi-scale parameters derived from the model of all cases were analyzed and compared against clinical parameters, cardiac imaging, lab tests and survival scores to evaluate the explicative power of the model and its potential for better patient stratification. Model validation was pursued by comparing clinical parameters that were not used in the fitting process against model parameters. CONCLUSION This paper illustrates how advanced multi-scale models can complement cardiovascular imaging and how they could be applied in patient care. Based on obtained results, it becomes conceivable that, after thorough validation, such heart failure models could be applied for patient management and therapy planning in the future, as we illustrate in one patient of our cohort who received CRT-D implantation.
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Affiliation(s)
- Elham Kayvanpour
- Department of Medicine III, University of Heidelberg, Heidelberg, Germany
- DZHK (German Centre for Cardiovascular Research), Heidelberg, Germany
| | - Tommaso Mansi
- Siemens Corporation, Corporate Technology, Imaging and Computer Vision, Princeton, New Jersey, United States of America
| | - Farbod Sedaghat-Hamedani
- Department of Medicine III, University of Heidelberg, Heidelberg, Germany
- DZHK (German Centre for Cardiovascular Research), Heidelberg, Germany
| | - Ali Amr
- Department of Medicine III, University of Heidelberg, Heidelberg, Germany
- DZHK (German Centre for Cardiovascular Research), Heidelberg, Germany
| | - Dominik Neumann
- Siemens Corporation, Corporate Technology, Imaging and Computer Vision, Princeton, New Jersey, United States of America
| | - Bogdan Georgescu
- Siemens Corporation, Corporate Technology, Imaging and Computer Vision, Princeton, New Jersey, United States of America
| | - Philipp Seegerer
- Siemens Corporation, Corporate Technology, Imaging and Computer Vision, Princeton, New Jersey, United States of America
| | - Ali Kamen
- Siemens Corporation, Corporate Technology, Imaging and Computer Vision, Princeton, New Jersey, United States of America
| | - Jan Haas
- Department of Medicine III, University of Heidelberg, Heidelberg, Germany
- DZHK (German Centre for Cardiovascular Research), Heidelberg, Germany
| | - Karen S. Frese
- Department of Medicine III, University of Heidelberg, Heidelberg, Germany
- DZHK (German Centre for Cardiovascular Research), Heidelberg, Germany
| | - Maria Irawati
- Department of Medicine III, University of Heidelberg, Heidelberg, Germany
| | - Emil Wirsz
- Siemens AG, Corporate Technology, Erlangen, Germany
| | - Vanessa King
- Siemens Corporation, Corporate Technology, Sensor Technologies, Princeton, New Jersey, United States of America
| | - Sebastian Buss
- Department of Medicine III, University of Heidelberg, Heidelberg, Germany
| | - Derliz Mereles
- Department of Medicine III, University of Heidelberg, Heidelberg, Germany
| | - Edgar Zitron
- Department of Medicine III, University of Heidelberg, Heidelberg, Germany
| | - Andreas Keller
- Biomarker Discovery Center Heidelberg, Heidelberg, Germany
- Department of Human Genetics, Saarland University, Homburg, Germany
| | - Hugo A. Katus
- Department of Medicine III, University of Heidelberg, Heidelberg, Germany
- DZHK (German Centre for Cardiovascular Research), Heidelberg, Germany
- Klaus Tschira Institute for Computational Cardiology, Heidelberg, Germany
| | - Dorin Comaniciu
- Siemens Corporation, Corporate Technology, Imaging and Computer Vision, Princeton, New Jersey, United States of America
| | - Benjamin Meder
- Department of Medicine III, University of Heidelberg, Heidelberg, Germany
- DZHK (German Centre for Cardiovascular Research), Heidelberg, Germany
- Klaus Tschira Institute for Computational Cardiology, Heidelberg, Germany
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Conn CE, Bythell-Douglas R, Neumann D, Yoshida S, Whittington B, Westwood JH, Shirasu K, Bond CS, Dyer KA, Nelson DC. Convergent evolution of strigolactone perception enabled host detection in parasitic plants. Science 2015; 349:540-3. [DOI: 10.1126/science.aab1140] [Citation(s) in RCA: 219] [Impact Index Per Article: 24.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Seegerer P, Mansi T, Jolly MP, Neumann D, Georgescu B, Kamen A, Kayvanpour E, Amr A, Sedaghat-Hamedani F, Haas J, Katus H, Meder B, Comaniciu D. Estimation of Regional Electrical Properties of the Heart from 12-Lead ECG and Images. ACTA ACUST UNITED AC 2015. [DOI: 10.1007/978-3-319-14678-2_21] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
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Neumann D, Grbic S, John M, Navab N, Hornegger J, Ionasec R. Probabilistic sparse matching for robust 3D/3D fusion in minimally invasive surgery. IEEE Trans Med Imaging 2015; 34:49-60. [PMID: 25095250 DOI: 10.1109/tmi.2014.2343936] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Classical surgery is being overtaken by minimally invasive and transcatheter procedures. As there is no direct view or access to the affected anatomy, advanced imaging techniques such as 3D C-arm computed tomography (CT) and C-arm fluoroscopy are routinely used in clinical practice for intraoperative guidance. However, due to constraints regarding acquisition time and device configuration, intraoperative modalities have limited soft tissue image quality and reliable assessment of the cardiac anatomy typically requires contrast agent, which is harmful to the patient and requires complex acquisition protocols. We propose a probabilistic sparse matching approach to fuse high-quality preoperative CT images and nongated, noncontrast intraoperative C-arm CT images by utilizing robust machine learning and numerical optimization techniques. Thus, high-quality patient-specific models can be extracted from the preoperative CT and mapped to the intraoperative imaging environment to guide minimally invasive procedures. Extensive quantitative experiments on 95 clinical datasets demonstrate that our model-based fusion approach has an average execution time of 1.56 s, while the accuracy of 5.48 mm between the anchor anatomy in both images lies within expert user confidence intervals. In direct comparison with image-to-image registration based on an open-source state-of-the-art medical imaging library and a recently proposed quasi-global, knowledge-driven multi-modal fusion approach for thoracic-abdominal images, our model-based method exhibits superior performance in terms of registration accuracy and robustness with respect to both target anatomy and anchor anatomy alignment errors.
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Fischer D, Neumann D, Wehrend A, Lierz M. Comparison of conventional and computer-assisted semen analysis in cockatiels (Nymphicus hollandicus) and evaluation of different insemination dosages for artificial insemination. Theriogenology 2014; 82:613-20. [DOI: 10.1016/j.theriogenology.2014.05.023] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2013] [Revised: 05/26/2014] [Accepted: 05/26/2014] [Indexed: 10/25/2022]
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Zettinig O, Mansi T, Neumann D, Georgescu B, Rapaka S, Seegerer P, Kayvanpour E, Sedaghat-Hamedani F, Amr A, Haas J, Steen H, Katus H, Meder B, Navab N, Kamen A, Comaniciu D. Data-driven estimation of cardiac electrical diffusivity from 12-lead ECG signals. Med Image Anal 2014; 18:1361-76. [PMID: 24857832 DOI: 10.1016/j.media.2014.04.011] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [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: 01/07/2014] [Revised: 03/17/2014] [Accepted: 04/10/2014] [Indexed: 11/25/2022]
Abstract
Diagnosis and treatment of dilated cardiomyopathy (DCM) is challenging due to a large variety of causes and disease stages. Computational models of cardiac electrophysiology (EP) can be used to improve the assessment and prognosis of DCM, plan therapies and predict their outcome, but require personalization. In this work, we present a data-driven approach to estimate the electrical diffusivity parameter of an EP model from standard 12-lead electrocardiograms (ECG). An efficient forward model based on a mono-domain, phenomenological Lattice-Boltzmann model of cardiac EP, and a boundary element-based mapping of potentials to the body surface is employed. The electrical diffusivity of myocardium, left ventricle and right ventricle endocardium is then estimated using polynomial regression which takes as input the QRS duration and electrical axis. After validating the forward model, we computed 9500 EP simulations on 19 different DCM patients in just under three seconds each to learn the regression model. Using this database, we quantify the intrinsic uncertainty of electrical diffusion for given ECG features and show in a leave-one-patient-out cross-validation that the regression method is able to predict myocardium diffusion within the uncertainty range. Finally, our approach is tested on the 19 cases using their clinical ECG. 84% of them could be personalized using our method, yielding mean prediction errors of 18.7ms for the QRS duration and 6.5° for the electrical axis, both values being within clinical acceptability. By providing an estimate of diffusion parameters from readily available clinical data, our data-driven approach could therefore constitute a first calibration step toward a more complete personalization of cardiac EP.
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Affiliation(s)
- Oliver Zettinig
- Siemens Corporate Technology, Imaging and Computer Vision, Princeton, NJ, USA; Computer Aided Medical Procedures, Technische Universität München, Germany
| | - Tommaso Mansi
- Siemens Corporate Technology, Imaging and Computer Vision, Princeton, NJ, USA.
| | - Dominik Neumann
- Siemens Corporate Technology, Imaging and Computer Vision, Princeton, NJ, USA; Pattern Recognition Lab, Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany
| | - Bogdan Georgescu
- Siemens Corporate Technology, Imaging and Computer Vision, Princeton, NJ, USA
| | - Saikiran Rapaka
- Siemens Corporate Technology, Imaging and Computer Vision, Princeton, NJ, USA
| | - Philipp Seegerer
- Siemens Corporate Technology, Imaging and Computer Vision, Princeton, NJ, USA; Pattern Recognition Lab, Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany
| | | | | | - Ali Amr
- Heidelberg University Hospital, Heidelberg, Germany
| | - Jan Haas
- Heidelberg University Hospital, Heidelberg, Germany
| | | | - Hugo Katus
- Heidelberg University Hospital, Heidelberg, Germany
| | | | - Nassir Navab
- Computer Aided Medical Procedures, Technische Universität München, Germany
| | - Ali Kamen
- Siemens Corporate Technology, Imaging and Computer Vision, Princeton, NJ, USA
| | - Dorin Comaniciu
- Siemens Corporate Technology, Imaging and Computer Vision, Princeton, NJ, USA
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Neumann D, Heuer A, Hemkemeyer M, Martens R, Tebbe CC. Response of microbial communities to long-term fertilization depends on their microhabitat. FEMS Microbiol Ecol 2013; 86:71-84. [PMID: 23397964 DOI: 10.1111/1574-6941.12092] [Citation(s) in RCA: 77] [Impact Index Per Article: 7.0] [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: 10/30/2012] [Revised: 01/29/2013] [Accepted: 02/06/2013] [Indexed: 11/30/2022] Open
Abstract
The objective of this study was to characterize the microbial communities attached to clay (< 2 μm), fine silt (2-20 μm), coarse silt (20-63 μm) and sand-sized fractions [> 63 μm; including particulate organic matter (POM)] of an arable soil and analyse their response to more than 100 years of two different fertilization regimes. Mild ultrasonic dispersal, wet-sieving and centrifugation allowed the separation of soil particles with the majority of bacterial cells and DNA still attached. Fertilizations increased soil organic carbon (SOC), total DNA and the abundance of bacterial, archaeal and fungal rRNA genes more strongly in the larger-sized fractions than in fine silt, and no effect was seen with clay, the latter representing above 70% of the total microbial populations. A highly positive correlation was found between microbial rRNA genes and the surface area provided by the particles, while the correlation with SOC was lower, indicating a particle-size-specific heterogeneous effect of SOC. The prokaryotic diversity responded more strongly to fertilization in the larger particles but not with clay. Overall, these results demonstrate that microbial responsiveness to long-term fertilization declined with smaller particle sizes and that especially clay fractions exhibit a high buffering capacity protecting microbial cells against changes even after 100 years under different agricultural management.
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Neumann D, Kaleta EF, Lierz M. Semen collection and artificial inseminationin cockatiels (Nymphicus hollandicus)--a potential model for psittacines. Tierarztl Prax Ausg K Kleintiere Heimtiere 2013; 41:101-105. [PMID: 23608965] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Received: 02/23/2012] [Accepted: 08/17/2012] [Indexed: 06/02/2023]
Abstract
STUDY Since many psittacine species are endangered and also rare in captivity, the number of offspring produced from breeding is crucial. Many potential breeding birds in species conservation programs are force-paired, and the eggs of many clutches are frequently infertile. Furthermore, male infertility is a common problem. The use of artificial insemination may increase the number of fertile eggs. MATERIAL AND METHODS In this study, 32 cockatiels (Nymphicus hollandicus) were divided into two groups. In one group, the males were endoscopically sterilised. The males of the other group were used as semen donors. After collection using a novel massage technique, semen samples were examined microscopically to assess contamination and quality. Samples with medium to high sperm concentrations, medium to high motility and no contaminants were used for intracloacal artificial insemination of hens in the group with sterile males. RESULTS In total, 74.2% of all attempts to collect semen were successful. Insemination resulted in fertilisation of 17 of 23 eggs (73.9%), which was slightly lower than the natural fertilisation rate (88.4%). No negative effects were observed on the oviposition interval of the inseminated hens throughout the entire study. CLINICAL RELEVANCE Easily applicable in veterinary practice, this study demonstrates that the use of artificial insemination may be a valuable tool to address reproductive failure of psittacines in breeding projects.
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Affiliation(s)
- D Neumann
- Clinic for Birds, Reptiles, Amphibians and Fish, Justus-Liebig University Giessen, Frankfurter Strasse 91-93, Giessen, Germany.
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Selzer D, Hahn T, Naegel A, Heisig M, Kostka KH, Lehr CM, Neumann D, Schaefer UF, Wittum G. Finite dose skin mass balance including the lateral part: comparison between experiment, pharmacokinetic modeling and diffusion models. J Control Release 2012; 165:119-28. [PMID: 23099116 DOI: 10.1016/j.jconrel.2012.10.009] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2012] [Revised: 10/10/2012] [Accepted: 10/12/2012] [Indexed: 11/29/2022]
Abstract
This work investigates in vitro finite dose skin absorption of the model compounds flufenamic acid and caffeine experimentally and mathematically. The mass balance in different skin compartments (donor, stratum corneum (SC), deeper skin layers (DSL), lateral skin parts and acceptor) is analyzed as a function of time. For both substances high amounts were found in the lateral skin compartment after 6h of incubation, which emphasizes not to elide these parts in the modeling. Here, three different mathematical models were investigated and tested with the experimental data: a pharmacokinetic model (PK), a detailed microscopic two-dimensional diffusion model (MICRO) and a macroscopic homogenized diffusion model (MACRO). While the PK model was fitted to the experimental data, the MICRO and the MACRO models employed input parameters derived from infinite dose studies to predict the underlying diffusion process. All models could satisfyingly predict or describe the experimental data. The PK model and MACRO model also feature the lateral parts.
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Affiliation(s)
- D Selzer
- Biopharmaceutics and Pharmaceutical Technology, Saarland University, Saarbruecken, Germany
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Krauss M, Mielczarek SR, Neumann D, Kuyatt CE. Mechanism for production of the Fourth Positive Band System of CO by electron impact on CO2. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/ja076i016p03733] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Abstract
Background: Recombinant human erythropoietin (EPO) is the leading biotechnology engineered hormone for treatment of anaemia associated with chronic conditions including kidney failure and cancer. The finding of EPO receptors on cancer cells has raised the concern that in addition to its action in erythropoiesis, EPO may promote tumour cell growth. We questioned whether EPO-induced signalling and consequent malignant cell manifestation is mediated by polyADP-ribosylation. Methods: Erythropoietin-mediated PARP (polyADP-ribose polymerase-1) activation, gene expression and core histone H4 acetylation were examined in UT7 cells, using western blot analysis, RT–PCR and immunofluorescence. Erythropoietin-driven migration of the human breast epithelial cell line MDA-MB-435 was determined by the scratch assay and in migration chambers. Results: We have found that EPO treatment induced PARP activation. Moreover, EPO-driven c-fos and Egr-1 gene expression as well as histone H4 acetylation were mediated via polyADP-ribosylation. Erythropoietin-induced cell migration was blocked by the PARP inhibitor, ABT-888, indicating an essential role for polyADP-ribosylation in this process. Conclusions: We have identified a novel pathway by which EPO-induced gene expression and breast cancer cell migration are regulated by polyADP-ribosylation. This study introduces new possibilities regarding EPO treatment for cancer-associated anaemia where combining systemic EPO treatment with targeted administration of PARP inhibitors to the tumour may allow safe treatment with EPO, minimising its possible undesirable proliferative effects on the tumour.
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Affiliation(s)
- D Inbar
- Department of Cell and Developmental Biology, Sackler Faculty of Medicine, Tel-Aviv University, Israel
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Mewes PW, Neumann D, Juloski AL, Angelopoulou E, Hornegger J. On-the-fly detection of images with gastritis aspects in magnetically guided capsule endoscopy. SPIE Proceedings 2011. [DOI: 10.1117/12.878803] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/30/2023]
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Neumann D, Prutchi-Sagiv S, Lifshitz L, Mittelman M. Erythropoietin receptor is detectable on peripheral blood lymphocytes and its expression increases in activated T lymphocytes (reply). Haematologica 2011. [DOI: 10.3324/haematol.2011.040030] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
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Mewes PW, Neumann D, Licegevic O, Simon J, Juloski AL, Angelopoulou E. Automatic region-of-interest segmentation and pathology detection in magnetically guided capsule endoscopy. Med Image Comput Comput Assist Interv 2011; 14:141-8. [PMID: 22003694 DOI: 10.1007/978-3-642-23626-6_18] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Magnetically-guided capsule endoscopy (MGCE) was introduced in 2010 as a procedure where a capsule in the stomach is navigated via an external magnetic field. The quality of the examination depends on the operator's ability to detect aspects of interest in real time. We present a novel two step computer-assisted diagnostic-procedure (CADP) algorithm for indicating gastritis and gastrointestinal bleedings in the stomach during the examination. First, we identify and exclude subregions of bubbles which can interfere with further processing. Then we address the challenge of lesion localization in an environment with changing contrast and lighting conditions. After a contrast-normalized filtering, feature extraction is performed. The proposed algorithm was tested on 300 images of different patients with uniformly distributed occurrences of the target pathologies. We correctly segmented 84.72% of bubble areas. A mean detection rate of 86% for the target pathologies was achieved during a 5-fold leave-one-out cross-validation.
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Boguhn J, Neumann D, Helm A, Strobel E, Tebbe CC, Dänicke S, Rodehutscord M. Effects of concentrate proportion in the diet with or withoutFusariumtoxin-contaminated triticale on ruminal fermentation and the structural diversity of rumen microbial communitiesin vitro. Arch Anim Nutr 2010; 64:467-83. [DOI: 10.1080/1745039x.2010.511515] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Maier W, Neumann D, Schröler HB, Schütte HR. Synthesen radioaktiv markierter Verbindungen; Synthese von Monomethylputrescin-[14CH3] und Monomethylputrescin-[14CH3-15N]. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/zfch.19660060909] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Neumann D, Schröler HB. Synthesen radioaktiv markierter Verbindungen; XIV. Synthese von α-N-14CH3-Ornithin und δ-N-14CH3-Ornithin [1]. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/zfch.19650051016] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Neumann D, Metzner G, Hofmann F, Dorn U. [Urinary bladder perforation caused by a loosened acetabular reinforcement ring]. Z Orthop Unfall 2010; 148:426-8. [PMID: 20391323 DOI: 10.1055/s-0030-1249815] [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: 10/19/2022]
Abstract
Reinforcement cages are widely used for the treatment of large acetabular bone defects. We report the case of a loosened Burch-Schneider reinforcement ring causing a recurrent macrohaematuria due to a perforation of the urinary bladder. After performing several diagnostic procedures, the patient underwent interdisciplinary revision surgery. Due to the severe destruction of the acetabular bone stock and an infection of the total hip prosthesis as confirmed by fresh frozen section, the hip prosthesis was explanted. At the last follow-up the patient was free of infect-related symptoms and was able to walk with one crutch.
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Affiliation(s)
- D Neumann
- Universitätsklinik für Orthopädie, Paracelsus Medizinische Privatuniversität Salzburg, Osterreich.
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Metzner G, Lindner B, Neumann D, Dorn U. [Incidence of anterior intertrochanteric ossifications after total hip arthroplasty--a retrospective long-term follow-up study]. Z Orthop Unfall 2010; 148:174-9. [PMID: 20178081 DOI: 10.1055/s-0029-1240860] [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: 10/19/2022]
Abstract
AIM This retrospective study investigates the incidence of anterior intertrochanteric ossifications (AIO), especially in comparison with heterotopic ossifications classified according to Brooker. A classification system of AIO regarding short-term results (< 1 year after surgery) was introduced in 2003: AIO occurred solely in 13 % of all cases (ossifications according to Brooker grade 0) and would have been "overlooked" without a lateral X-ray. The incidence of AIO combined with ossifications according to Brooker > 0 was 48.8 % of all cases. Our study reports long-term results, furthermore correlations between ossifications and clinical outcome, rated by the Harris hip score (HHS) and range of motion (ROM), are evaluated. MATERIAL AND METHODS 149 cementless total hip arthroplasties (Hofer-Imhof threaded cup, straight stem), implanted into 140 patients from November 1991 to December 1994 underwent complete clinical and radiological follow-up from December 2005 to October 2006. The average age of the 81 female and 59 male patients at the time of implantation was 64 years. Without exception, a conventional, transgluteal approach (Bauer) was performed. All patients received indomethacin prophylaxis for 8 consecutive days after surgery. Current X-rays (a.-p. and lateral view) were evaluated in comparison with the former X-rays. RESULTS AIO were found in 77 cases (51.7 %), heterotopic ossifications corresponding to Brooker in 93 cases (62.4 %), a combination of AIO and Brooker in 58 cases (38.9 %) and solitary AIO in 19 cases (12.8 %). HHS and ROM were not significantly altered by ossifications. CONCLUSION Our long-term findings compare with the short-term results (indicating lack of new bone formation [heterotopic ossification] after more than one year after surgery, as previously described in the literature concerning ossifications according to Brooker) and verify the incidence rate of solitary AIO. Despite a minor correlation with clinical outcome, AIO could be considered as a possible indicator for predilection of heterotopic bone formation, especially if revision arthroplasty or THA of the contralateral side is needed.
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Affiliation(s)
- G Metzner
- Universitätsklinik für Orthopädie, Paracelsus Medizinische Privatuniversität Salzburg, Osterreich.
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Appleton E, Thomas P, Neumann D. The effect of attentional cues on cycling performance at different levels of skill development. J Sci Med Sport 2010. [DOI: 10.1016/j.jsams.2009.10.029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Hahn T, Hansen S, Neumann D, Kostka KH, Lehr CM, Muys L, Schaefer U. Infrared Densitometry: A Fast and Non-Destructive Method for Exact Stratum Corneum Depth Calculation for in vitro Tape-Stripping. Skin Pharmacol Physiol 2010; 23:183-92. [DOI: 10.1159/000288165] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2009] [Accepted: 12/09/2009] [Indexed: 11/19/2022]
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Fischer D, Heuser W, Pantchev N, Wolken S, Neumann D, Lierz M. [Subcutaneous sparganosis in an Australian green tree frog (Litoria caerulea)]. Tierarztl Prax Ausg K Kleintiere Heimtiere 2010; 38:249-253. [PMID: 22215301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Subscribe] [Scholar Register] [Received: 02/03/2010] [Accepted: 12/03/2009] [Indexed: 05/31/2023]
Affiliation(s)
- D Fischer
- Dominik Fischer, Klinik für Vögel, Reptilien, Amphibien und Fische, Justus-Liebig-Universität Gießen, Frankfurter Straße 91-93, 35392 Gießen, E-Mail:
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Burdick M, Neumann D, Pohlman B, Reddy C, Tendulkar R, Macklis R. External Beam Radiotherapy followed by Y90 Ibritumomab Tiuxetan in Relapsed Bulky Follicular Lymphoma. Int J Radiat Oncol Biol Phys 2009. [DOI: 10.1016/j.ijrobp.2009.07.1100] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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