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Ley S, Weigert A, Weichand B, Henke N, Mille-Baker B, Janssen RAJ, Brüne B. The role of TRKA signaling in IL-10 production by apoptotic tumor cell-activated macrophages. Oncogene 2012; 32:631-40. [PMID: 22410777 DOI: 10.1038/onc.2012.77] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Tumor-associated macrophages (TAMs) are a major supportive component within neoplasms. Mechanisms of macrophage (MΦ) attraction and differentiation to a tumor-promoting phenotype, which is characterized by pronounced interleukin (IL)-10 production, are under investigation. We report that supernatants of dying cancer cells induced substantial IL-10 release from primary human MΦs, dependent on signaling through tyrosine kinase receptor A (TRKA or neurotrophic tyrosine kinase receptor type 1 (NTRK1)). Mechanistically, sphingosine-1-phosphate (S1P) release from apoptotic cancer cells triggered src-dependent shuttling of cytosolic TRKA to the plasma membrane via S1P receptor signaling. Plasma membrane-associated TRKA, which was activated by constitutively autocrine secreted nerve growth factor, used phosphatidylinositol 3-kinase (PI3K)/AKT and p38 mitogen-activated protein kinase (MAPK) signaling to induce IL-10. Interestingly, TRKA-dependent signaling was required for cytokine production by TAMs isolated from primary murine breast cancer tissue. Besides IL-10, this pathway initiated secretion of IL-6, tumor necrosis factor-α (TNF-α) and monocyte chemotactic protein-1 (MCP-1), indicating relevance in cancer-associated inflammation. Our findings highlight a fine-tuned regulatory system including S1P-dependent TRKA trafficking for executing TAM-like cell function in vitro as well as in vivo.
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Salehi Ravesh M, Brix G, Laun FB, Kuder TA, Puderbach M, Ley-Zaporozhan J, Ley S, Fieselmann A, Herrmann MF, Schranz W, Semmler W, Risse F. Quantification of pulmonary microcirculation by dynamic contrast-enhanced magnetic resonance imaging: Comparison of four regularization methods. Magn Reson Med 2012; 69:188-99. [DOI: 10.1002/mrm.24220] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2011] [Revised: 12/23/2011] [Accepted: 01/27/2012] [Indexed: 11/11/2022]
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Hauke A, Krämer J, Laqua D, Ley S, Husar P. High Performance Triple LED Driver with Digitally Controlled Analog Dimming for Reflection Pulse Oximetry. BIOMED ENG-BIOMED TE 2012. [DOI: 10.1515/bmt-2012-4128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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29
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Weyrich S, Sprenger S, Böttrich M, Schmidt P, Laqua D, Ley S, Husar P. Development of a Phantom to Modulate the Maternal and Fetal Pulse Curve for Pulse Oximetry Measurements. BIOMED ENG-BIOMED TE 2012; 57 Suppl 1:/j/bmte.2012.57.issue-s1-O/bmt-2012-4204/bmt-2012-4204.xml. [DOI: 10.1515/bmt-2012-4204] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Jurczynski K, Scharpegge J, Ley-Zaporozhan J, Ley S, Cracknell J, Lyashchenko K, Greenwald R, Schenk JP. Computed tomographic examination of South American sea lions (Otaria flavescens) with suspected Mycobacterium pinnipedii infection. Vet Rec 2011; 169:608. [PMID: 21984562 DOI: 10.1136/vr.100234] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
Ten South American sea lions (Otaria flavescens) were presented for clinical evaluation and diagnosis of tuberculosis following known exposure to Mycobacterium pinnipedii. CT was used to determine whether foci of calcification in mediastinal lymph nodes, typically associated with pinniped tuberculosis, could be detected and whether CT was a useful diagnostic modality, in conjunction with other tests, for the diagnosis of tuberculosis in this species. Blood was collected from the caudal gluteal vein of each animal for serological testing using commercially available serological tests (ElephantTB STAT-PAK and DPP Vet; Chembio Diagnostic Systems) and a multiantigen print immunoassay (MAPIA), carried out at Chembio to verify the in-house kits. In four of nine animals that underwent CT scanning, lesions consistent with pinniped tuberculosis were apparent and these were confirmed at subsequent postmortem examination. The five remaining animals did not show any abnormalities on CT, with three being negative on serological tests, which were considered to be normal and potentially used as reference images for healthy sea lions. One animal could not be CT scanned due to its large size and weight (510 kg).
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Hochhegger B, Marchiori E, Sedlaczek O, Irion K, Heussel CP, Ley S, Ley-Zaporozhan J, Soares Souza A, Kauczor HU. MRI in lung cancer: a pictorial essay. Br J Radiol 2011; 84:661-8. [PMID: 21697415 DOI: 10.1259/bjr/24661484] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Imaging studies play a critical role in the diagnosis and staging of lung cancer. CT and 18-fluorodeoxyglucose positron emission tomography CT (PET/CT) are widely and routinely used for staging and assessment of treatment response. Many radiologists still use MRI only for the assessment of superior sulcus tumours, and in cases where invasion of the spinal cord canal is suspected. MRI can detect and stage lung cancer, and this method could be an excellent alternative to CT or PET/CT in the investigation of lung malignancies and other diseases. This pictorial essay discusses the use of MRI in the investigation of lung cancer.
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Keller DUJ, Jarrousse O, Fritz T, Ley S, Dossel O, Seemann G. Impact of Physiological Ventricular Deformation on the Morphology of the T-Wave: A Hybrid, Static-Dynamic Approach. IEEE Trans Biomed Eng 2011; 58:2109-19. [DOI: 10.1109/tbme.2011.2147785] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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33
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Robalo Cordeiro C, Singh S, Herth FJF, Ley S, Chavannes NH, Clini E, Cottin V. Selected clinical highlights from the 2010 ERS Congress in Barcelona. Eur Respir J 2011; 38:209-17. [PMID: 21436357 DOI: 10.1183/09031936.00039011] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
This article reviews a selection of presentations at the 2010 annual meeting of the European Respiratory Society held in Barcelona, Spain, which was the largest congress ever in the field of respiratory medicine. The best abstracts from the groups of the Clinical Assembly (Clinical Problems, Rehabilitation and Chronic Care, Imaging, Interventional Pulmonology, Diffuse Parenchymal Lung Disease, and General Practice and Primary Care) are presented in the context of the current literature.
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Hochhegger B, Ley-Zaporozhan J, Marchiori E, Irion K, Souza AS, Moreira J, Kauczor HU, Ley S. Magnetic resonance imaging findings in acute pulmonary embolism. Br J Radiol 2011; 84:282-7. [PMID: 21224294 DOI: 10.1259/bjr/26121475] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
Pulmonary embolism (PE) is the third most common acute cardiovascular disease after myocardial infarction and stroke, and results in thousands of deaths each year. Improvements in MRI accuracy are ongoing with the use of parallel imaging for angiography techniques and pulmonary perfusion. This, associated with other potential advantages of MRI (e.g. a radiation free method and better safety profile of MR contrast media), reinforces its use. The aim of this paper is to perform a pictorial review of the principal findings of MRI in acute PE. Acute PE can manifest itself as complete arterial occlusion and the affected artery may be enlarged. We report the main vascular and parenchymal signs, and an overview of current literature regarding accuracy, limitations and technical aspects is provided.
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Ley S, Ley-Zaporozhan J, Günther P, Deubzer HE, Witt O, Schenk JP. Neuroblastoma imaging. ROFO-FORTSCHR RONTG 2010; 183:217-25. [PMID: 21170823 DOI: 10.1055/s-0029-1245903] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Neuroblastoma is an embryonic tumor of the sympathetic nervous system which represents one of the most common malignancies in early childhood. Its clinical and biological behavior show a remarkable heterogeneity, ranging from spontaneous regression to inexorable progression with a fatal outcome. This review summarizes the clinical risk stratification and treatment options. An extensive overview of the role of imaging during the course of the disease and typical imaging findings in all imaging modalities are demonstrated.
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Ley S, O’Brien M, Baxendale I. Flow Ozonolysis Using a Semipermeable Teflon AF-2400 Membrane. ACTA ACUST UNITED AC 2010. [DOI: 10.1055/s-0030-1258661] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Grünig E, Barner A, Bell M, Claussen M, Dandel M, Dumitrescu D, Gorenflo M, Holt S, Kovacs G, Ley S, Meyer JF, Pabst S, Riemekasten G, Saur J, Schwaiblmair M, Seck C, Sinn L, Sorichter S, Winkler J, Leuchte HH. [Non-invasive diagnosis of pulmonary hypertension: ESC/ERS Guidelines with commentary of the Cologne Consensus Conference 2010]. Dtsch Med Wochenschr 2010; 135 Suppl 3:S67-77. [PMID: 20862623 DOI: 10.1055/s-0030-1263314] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
The 2009 European Guidelines on Diagnosis and Treatment of Pulmonary Hypertension have been adopted for Germany. The guidelines contain detailed recommendations for the diagnosis of pulmonary hypertension. However, the practical implementation of the European Guidelines in Germany requires the consideration of several country-specific issues and already existing novel data. This requires a detailed commentary to the guidelines, and in some aspects an update y appears necessary. In June 2010, a Consensus Conference organized by the PH working groups of the German Society of Cardiology (DGK), the German Society of Respiratory Medicine (DGP) and the German Society of Pediatric Cardiology (DGPK) was held in Cologne, Germany. This conference aimed to solve practical and controversial issues surrounding the implementation of the European Guidelines in Germany. To this end, a number of working groups was initiated, one of which was specifically dedicated to non-invasive diagnosis of PH. This commentary summarizes the results and recommendations of the working group on treatment of PAH.
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Ley S, Cameron A. Brugada Syndrome and Brugada ECG Pattern: Unusual Causes of ST Elevation. Scott Med J 2010. [DOI: 10.1258/rsmsmj.55.2.58g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Brugada Syndrome is a channelopathy that leads to ST elevation or right bundle branch block pattern in the right ventricular leads on ECG analysis and predisposes to ventricular tachyarrhythmias and sudden death. The ECG pattern can also be drug induced with several agents. This case describes a patient who presented after a mixed overdose of amitriptyline, olanzapine and alimemazine with ST elevation and T wave inversion on his ECG that were initially thought to be due to an Acute Coronary Syndrome.
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Ley S, Ley-Zaporozhan J. Diagnostik von Fehlbildungen der thorakalen und mediastinalen Gefäße. ROFO-FORTSCHR RONTG 2010. [DOI: 10.1055/s-0030-1252348] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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40
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Ley S. Airspace-Verschattungen. ROFO-FORTSCHR RONTG 2010. [DOI: 10.1055/s-0030-1252438] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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41
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Kreuter M, Geissler T, Molinari F, Eichinger M, Ley S, Bonomo L, Heußel CP, Kauczor HU, Herth FJF, Puderbach M. Reproduzierbarkeit der Navigator-getriggerten Sauerstoff-verstärkten MRT der Lunge. Pneumologie 2010. [DOI: 10.1055/s-0030-1251424] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Ley-Zaporozhan J, Unterhinninghofen R, Rengier F, Markl M, Eichhorn J, von Tengg-Kobligk H, Ley S. Four-dimensional visualization of thoracic blood flow by magnetic resonance imaging in a patient following correction of transposition of the great arteries (d-TGA) and uncorrected aortic coarctation. Acta Radiol 2009; 50:909-13. [PMID: 19639472 DOI: 10.1080/02841850903061437] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
Recent advances in flow-sensitive magnetic resonance imaging (MRI) and data analysis allow for comprehensive noninvasive three-dimensional (3D) visualization of complex blood flow. Electrocardiogram (ECG)-gated three-directional (3dir) flow measurements were employed to assess and visualize time-resolved 3D blood flow in the pulmonary arteries (PA) and thoracic aorta. We present findings in a juvenile patient with surgically corrected transposition of the great arteries (d-TGA) and aortic coarctation. For the first time, the complex flow patterns in the PA following d-TGA were visualized. Morphologically, a slight asymmetry of the PA was found, with considerable impact on vascular hemodynamics, resulting in diastolic retrograde flow in the larger vessel and diastolic filling of the smaller PA. Additionally, increased flow to the supraaortic vessels was found due to aortic coarctation.
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Ley-Zaporozhan J, Ley S, Sommerburg O, Komm N, Müller FMC, Schenk JP. Clinical application of MRI in children for the assessment of pulmonary diseases. ROFO-FORTSCHR RONTG 2009; 181:419-32. [PMID: 19353481 DOI: 10.1055/s-0028-1109128] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
The standard examination technique for the chest in children is an X-ray examination - it is fast, cheap and provides a good overview of anatomy and pathology. In cases with an unclear pathology or if more details are needed (i. e. pre-therapeutically), computed tomography is most often performed with the well known drawbacks of limited soft tissue contrast and radiation. Radiation should be avoided in children, especially if follow-up examinations are needed. Recent magnetic resonance (MR) techniques allow for fast and reliable assessment of pulmonary diseases in children. Due to the inherent soft tissue contrast, diagnosis can be frequently performed without contrast media application. This review provides an exemplary MR examination protocol for routine application in pediatric patients. The diagnostic value of MRI is shown in patients with infectious diseases, patients with immunodeficiency, anatomic abnormalities, acquired chronic diseases, and pulmonary tumors. Since MRI is especially suitable for functional imaging, an MR protocol is provided for the examination of thoracic deformities. This review summarizes the use of thoracic MRI in the clinical pediatric setting with special focus on the clinical indications as a radiation-free method.
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Weber TF, Habetler V, Kauczor HU, Ley S, Tengg-Kobligk HV. Phasenkontrastangiographische Quantifizierung des aortalen Blutflusses während körperlicher Belastung mit einem MRT-kompatiblen Fahrradergometer. ROFO-FORTSCHR RONTG 2009. [DOI: 10.1055/s-0029-1221485] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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45
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Ley S, Schenk JP. Neuroblastom und andere Nebennierentumore im Kindesalter. ROFO-FORTSCHR RONTG 2009. [DOI: 10.1055/s-0029-1220989] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Schenk JP, Ley S. Pädiatrische Besonderheiten: Tumoren der Nieren und Nebennieren. ROFO-FORTSCHR RONTG 2009. [DOI: 10.1055/s-0029-1221074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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47
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Kauczor HU, Ley S. Pulmonale Gefäßerkrankungen. ROFO-FORTSCHR RONTG 2009. [DOI: 10.1055/s-0029-1221064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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48
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Owsijewitsch M, Ley-Zaporozhan J, Kuhnigk J, Heußel CP, Kauczor HU, Ley S. COPD-Phänotypisierung mittels Computertomografie: Vergleich eines anatomischen, lappenbasierten und eines nicht-anatomischen Ansatzes zur Verteilungsbeschreibung von Emphysem. Pneumologie 2009. [DOI: 10.1055/s-0029-1213841] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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49
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Owsijewitsch M, Ley-Zaporozhan J, Kuhnigk J, Heußel CP, Kauczor HU, Ley S. COPD-Phänotypisierung mittels Computertomografie: Emphysemverteilung zwischen Kern- und Rindenregion der Lunge. Pneumologie 2009. [DOI: 10.1055/s-0029-1213840] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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50
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von Tengg-Kobligk H, Ley-Zaporozhan J, Henninger V, Grünberg K, Giesel F, Böckler D, Krummenauer F, Kauczor HU, Ley S. Intraindividual Assessment of the Thoracic Aorta using Contrast and Non-Contrast-Enhanced MR Angiography. ROFO-FORTSCHR RONTG 2009; 181:230-6. [DOI: 10.1055/s-0028-1109039] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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