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Magnetic nanoparticles (NPs), such as very small iron oxide NPs (VSOPs) can be used for targeted drug delivery, cancer treatment or tissue engineering. Another important field of application is the labelling of mesenchymal stem cells to allow in vivo tracking and visualization of transplanted cells using magnetic resonance imaging (MRI). For these NPs, however, various toxic effects, as well as functional impairment of the exposed cells, are described. The present study evaluates the influence of VSOPs on the multilineage differentiation ability and cytokine secretion of human adipose tissue derived stromal cells (hASCs) after long-term exposure. Human ASCs were labelled with VSOPs, and the efficacy of the labelling was documented over 4 weeks in vitro cultivation of the labelled cells. Unlabelled hASCs served as negative controls. Four weeks after labelling, adipogenic and osteogenic differentiation was histologically evaluated and quantified by polymerase chain reaction (PCR). Changes in gene expression of IL-6, IL-8, VEGF and caspase 3 were determined over 4 weeks. Four weeks after the labelling procedure, labelled and unlabelled hASCs did not differ in the gene expression of IL-6, IL-8, VEGF and caspase 3. Furthermore, the labelling procedure had no influence on the multidifferentiation ability of hASC. The percentage of labelled cells decreased during in vitro expansion over 4 weeks. Labelling with VSOPs and long-term intracellular disposition probably have no influence on the physiological functions of hASCs. This could be important for the future in vivo use of iron oxide NPs.

Agmal Scherzad, Rudolf Hagen, Stephan Hackenberg Department of Otorhinolaryngology, Plastic, Aesthetic and Reconstructive Head and Neck Surgery, Julius Maximilian University of Wuerzburg, Würzburg 97080, GermanyCorrespondence: Agmal ScherzadDepartment of Otorhinolaryngology, Plastic, Aesthetic and Reconstructive Head and Neck Surgery, Julius Maximilian University of Wuerzburg, Würzburg 97080, GermanyEmail Scherzad_A@ukw.deAbstract: The functional role of the respiratory epithelium is to generate a physical barrier. In addition, the epithelium supports the innate and acquired immune system through various cytokines and chemokines. However, epithelial cells are also involved in the pathogenesis of various respiratory diseases, some of which are mediated by increased permeability of the mucosal membrane or disturbed mucociliary transport. In addition, it has been shown that epithelial cells are involved in the development of inflammatory respiratory diseases. The following review article focuses on the aspects of epithelial mis-differentiation, in particular with respect to nasal mucosal barrier function, epithelial immunogenicity, nasal epithelial–mesenchymal transition and nasal microbiome.Keywords: nasal mucosal barrier function, tight junction, epithelial–mesenchymal transition, microbiome

Background: Antinuclear antibody (ANA) positivity encompass a clinically homogenous group of patients with juvenile idiopathic arthritis (JIA) characterized by early diseases onset, high risk of uveitis and female preponderance. However, less is known whether ANA+ JIA patients also share a common[for full text, please go to the a.m. URL], 47. Kongress der Deutschen Gesellschaft für Rheumatologie (DGRh), 33. Jahrestagung der Deutschen Gesellschaft für Orthopädische Rheumatologie (DGORh), 29. Jahrestagung der Gesellschaft für Kinder- und Jugendrheumatologie (GKJR)

Einleitung Die totale Laryngektomie stellt nach wie vor ein Standardverfahren zur Therapie fortgeschrittener Larynx- und Hypopharynxkarzinome dar. Der Verlust des stimmbildenden Organs schränkt die Lebensqualität der Betroffenen maßgeblich ein. Durch die rekonstruktive Chirurgie stehen[zum vollständigen Text gelangen Sie über die oben angegebene URL], 36. Wissenschaftliche Jahrestagung der Deutschen Gesellschaft für Phoniatrie und Pädaudiologie (DGPP)

Einleitung Die Stimmrehabilitation nach Laryngektomie spielt eine entscheidende Rolle für die Lebensqualität. Eine suffiziente Stimmgebung beeinflusst wesentlich die psychische Verfassung der Patienten. Neben der permanenten Tracheotomie ist der Verlust der eigenen Stimme für die Patienten[zum vollständigen Text gelangen Sie über die oben angegebene URL], 36. Wissenschaftliche Jahrestagung der Deutschen Gesellschaft für Phoniatrie und Pädaudiologie (DGPP)

The functional role of the respiratory epithelium is to generate a physical barrier. In addition, the epithelium supports the innate and acquired immune system through various cytokines and chemokines. However, epithelial cells are also involved in the pathogenesis of various respiratory diseases, some of which are mediated by increased permeability of the mucosal membrane or disturbed mucociliary transport. In addition, it has been shown that epithelial cells are involved in the development of inflammatory respiratory diseases. The following review article focuses on the aspects of epithelial mis-differentiation, in particular with respect to nasal mucosal barrier function, epithelial immunogenicity, nasal epithelial–mesenchymal transition and nasal microbiome.

Radioresistance is an important cause of head and neck cancer therapy failure. Zinc oxide nanoparticles (ZnO-NP) mediate tumor-selective toxic effects. The aim of this study was to evaluate the potential for radiosensitization of ZnO-NP. The dose-dependent cytotoxicity of ZnO-NP20 nm and ZnO-NP100 nm was investigated in FaDu and primary fibroblasts (FB) by an MTT assay. The clonogenic survival assay was used to evaluate the effects of ZnO-NP alone and in combination with irradiation on FB and FaDu. A formamidopyrimidine-DNA glycosylase (FPG)-modified single-cell microgel electrophoresis (comet) assay was applied to detect oxidative DNA damage in FB as a function of ZnO-NP and irradiation exposure. A significantly increased cytotoxicity after FaDu exposure to ZnO-NP20 nm or ZnO-NP100 nm was observed in a concentration of 10 &micro, g/mL or 1 &micro, g/mL respectively in 30 &micro, g/mL of ZnO-NP20 nm or 20 &micro, g/mL of ZnO-NP100 nm in FB. The addition of 1, 5, or 10 &micro, g/mL ZnO-NP20 nm or ZnO-NP100 nm significantly reduced the clonogenic survival of FaDu after irradiation. The sub-cytotoxic dosage of ZnO-NP100 nm increased the oxidative DNA damage compared to the irradiated control. This effect was not significant for ZnO-NP20 nm. ZnO-NP showed radiosensitizing properties in the sub-cytotoxic dosage. At least for the ZnO-NP100 nm, an increased level of oxidative stress is a possible mechanism of the radiosensitizing effect.

Einleitung Nach Laryngektomie (LE) ist die Stimmrehabilitation mit Hilfe von „Ersatzstimmen“ etabliert. Am häufigsten kommen hierbei Stimmshuntventile (SV) zum Einsatz. Als Alternative hat sich die Laryngoplastik (LP) nach Hagen etabliert [ref:1]. Bei beiden Verfahren[zum vollständigen Text gelangen Sie über die oben angegebene URL], 4. Dreiländertagung D-A-CH, 35. Wissenschaftliche Jahrestagung der Deutschen Gesellschaft für Phoniatrie und Pädaudiologie (DGPP)

Background: Zinc oxide nanoparticles (ZnO NPs) are among the most frequently applied nanomaterials in consumer products. Evidence exists regarding the cytotoxic effects of ZnO NPs in mammalian cells; however, knowledge about the potential genotoxicity of ZnO NPs is rare, and results presented in the current literature are inconsistent. Objectives: The aim of this review is to summarize the existing data regarding the DNA damage that ZnO NPs induce, and focus on the possible molecular mechanisms underlying genotoxic events. Methods: Electronic literature databases were systematically searched for studies that report on the genotoxicity of ZnO NPs. Results: Several methods and different endpoints demonstrate the genotoxic potential of ZnO NPs. Most publications describe in vitro assessments of the oxidative DNA damage triggered by dissoluted Zn2+ ions. Most genotoxicological investigations of ZnO NPs address acute exposure situations. Conclusion: Existing evidence indicates that ZnO NPs possibly have the potential to damage DNA. However, there is a lack of long-term exposure experiments that clarify the intracellular bioaccumulation of ZnO NPs and the possible mechanisms of DNA repair and cell survival.