76
|
Le DD, Rochlitzer S, Heck S, Bals R, Braun A, Welte T, Dinh QT. Allergische Atemwegsentzündung induziert eine Zunahme von Dendritischen Zellen in den Atemwegsganglien der Maus. Pneumologie 2014. [DOI: 10.1055/s-0034-1367922] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
77
|
Funck U, Le DD, Rochlitzer S, Heck S, Bals R, Braun A, Welte T, Dinh QT. Veränderung von MHC-II positiven Zellen der Atemwegsganglien bei chronischem Hausstaubmilben-Mausmodell und HRV1B Infektion. Pneumologie 2014. [DOI: 10.1055/s-0034-1367785] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
78
|
Paranjpe M, Neuhaus V, Finke JH, Richter C, Gothsch T, Kwade A, Büttgenbach S, Braun A, Müller-Goymann CC. In vitro and ex vivo toxicological testing of sildenafil-loaded solid lipid nanoparticles. Inhal Toxicol 2014; 25:536-43. [PMID: 23905970 DOI: 10.3109/08958378.2013.810315] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
The aim of this study was to investigate the potential cytotoxicity of solid lipid nanoparticles (SLN) loaded with sildenafil. The SLNs were tested as a new drug delivery system (DDS) for the inhalable treatment of pulmonary hypertension in human lungs. Solubility of sildenafil in SLN lipid matrix (30:70 phospholipid:triglyceride) was determined to 1% sildenafil base and 0.1% sildenafil citrate, respectively. Sildenafil-loaded SLN with particle size of approximately 180 nm and monomodal particle size distribution were successfully manufactured using a novel microchannel homogenization method and were stable up to three months. Sildenafil-loaded SLN were then used in in vitro and ex vivo models representing lung and heart tissue. For in vitro models, human alveolar epithelial cell line (A459) and mouse heart endothelium cell line (MHEC5-T) were used. For ex vivo models, rat precision cut lung slices (PCLS) and rat heart slices (PCHS) were used. All the models were treated with plain SLN and sildenafil-loaded SLN in a concentration range of 0-5000 µg/ml of lipid matrix. The toxicity was evaluated in vitro and ex vivo by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay. Median lethal dose 50% (LD50) values for A549 cells and PCLS were found to be in the range of 1200-1900 µg/ml while for MHEC5-T cells and precision cut heart slices values were found between 1500 and 2800 µg/ml. PCHS showed slightly higher LD50 values in comparison to PCLS. Considering the toxicological aspects, sildenafil-loaded SLN could have potential in the treatment of pulmonary hypertension via inhalation route.
Collapse
|
79
|
Wichmann J, Jimenez Delgado SM, Curths C, Becker T, Kaup FJ, Braun A, Sewald K, Knauf S. Frühe Phase der Allergen-induzierten Atemwegsreaktion beim Weißbüschelaffen nach passiver Sensibilisierung von Lungengewebe mit humanem Blutplasma. Pneumologie 2014. [DOI: 10.1055/s-0033-1363101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
80
|
Curths C, Wichmann J, Becker T, Kaup FJ, Hohlfeld JM, Windt H, Dunker S, Hoymann HG, Braun A, Knauf S. Lung function assessment in the common marmoset (Callithrix jacchus) for the evaluation of translational nonhuman primate models of lung inflammation. Pneumologie 2014. [DOI: 10.1055/s-0033-1363117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
81
|
Funck U, Le DD, Rochlitzer S, Heck S, Bals R, Braun A, Welte T, Dinh QT. Veränderung von MHC-II positiven Zellen der Atemwegganglien bei chronischem Hausstaubmilben-Mausmodell und HRV1B Infektion. Pneumologie 2014. [DOI: 10.1055/s-0033-1363097] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
82
|
Semar S, Klotz M, Letiembre M, Van Ginneken C, Braun A, Jost V, Bischof M, Lammers WJ, Liu Y, Fassbender K, Wyss-Coray T, Kirchhoff F, Schäfer KH. Changes of the enteric nervous system in amyloid-β protein precursor transgenic mice correlate with disease progression. J Alzheimers Dis 2013; 36:7-20. [PMID: 23531500 DOI: 10.3233/jad-120511] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
In Alzheimer's disease (AD), fatal neuronal cell loss occurs long before relevant evidence can lead to a reliable diagnosis. If characteristic pathological alterations take place in the enteric nervous system (ENS), it could be one of the most promising targets for an early diagnosis, using submucosal biopsies from the gut. We therefore investigated time- and spatial-dependent changes in an amyloid-β protein precursor (AβPP) overexpressing transgenic mouse model to examine early changes within the ENS. Wholemount preparations and paraffin sections were analyzed for the expression of neuronal, glial, and innate immunity markers. Isolated myenteric networks were screened for differences in overall protein expression, and a motility analysis delivered functional data. The level of AβPP in the gut was significantly higher in the AD mouse model than in wild-type mice and also higher in the gut than in the brain at all ages investigated. The transcriptional level of Nestin, GFAP, and TLR4 increased with age with a peak at 3 months. At the protein level, human amyloid-β was located in myenteric neurons. Myenteric networks showed a reduction of the neuronal density in AβPP compared to wild-type mice, which was functionally relevant as revealed by motility analysis. The ENS undergoes significant changes during the early onset of AβPP expression in AD mouse models that appear before those seen in the brain as demonstrated in this study. Thus, there is a chance of determining similar alterations in the human gut of AD patients, which could be used to develop early diagnostic approaches.
Collapse
|
83
|
Hansen T, Kopf J, Danov O, Ströbele M, Braun A, Sewald K, Bockhorn H, Fehrenbach H. In vitro and ex vivo toxicity screening for predicting toxicological effects of synthetic carbon black nanoparticles in humans. Pneumologie 2013. [DOI: 10.1055/s-0033-1357065] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
84
|
Curths C, Becker T, Kaup FJ, Schlumbohm C, Sewald K, Hohlfeld JM, Dunker S, Braun A, Knauf S. Ein translationales Tiermodell für das allergische Asthma des Menschen im Weißbüschelaffen (Callithrix jacchus). Pneumologie 2013. [DOI: 10.1055/s-0033-1343971] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
85
|
Seehase S, Switalla S, Neuhaus V, Zöller M, Kaup FJ, Schlumbohm C, Fuchs E, Lauenstein HD, Sewald K, Hohlfeld JM, Braun A, Knauf S. Ein translationales LPS-Modell zur präklinischen Testung anti-inflammatorischer Substanzen im Weißbüschelaffen (Callithrix jacchus). Pneumologie 2013. [DOI: 10.1055/s-0033-1343970] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
86
|
Braun A, Saracbasi E, Grifka J, Kiltz U, Schnittker J, Braun J. SAT0258 Identification of axial spondyloarthritis among patients with chronic back pain in primary care – does determination of HLA B27 improve the performance of clinical assessments of inflammatory back pain? Ann Rheum Dis 2013. [DOI: 10.1136/annrheumdis-2012-eular.3205] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
|
87
|
Braun A, Gnann H, Saracbasi E, Grifka J, Kiltz U, Letschert K, Braun J. Optimizing the identification of patients with axial spondyloarthritis in primary care--the case for a two-step strategy combining the most relevant clinical items with HLA B27. Rheumatology (Oxford) 2013; 52:1418-24. [DOI: 10.1093/rheumatology/ket115] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
|
88
|
Patrick D, Smith M, Cleeland C, Fallowfield L, Tombal B, Oudard S, Shore N, Saad F, Marx G, Coleman R, Gómez-Veiga F, Damião R, Zhou Y, Arellano J, Braun A, Qian Y. 99 The impact of bone metastases on pain: Results from a phase III denosumab study in men with nonmetastatic castration-resistant prostate cancer. ACTA ACUST UNITED AC 2013. [DOI: 10.1016/s1569-9056(13)60591-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
89
|
Seehase S, Switalla S, Neuhaus V, Zöller M, Kaup FJ, Schlumbohm C, Fuchs E, Lauenstein HD, Sewald K, Hohlfeld JM, Braun A, Knauf S. Ein translationales LPS-Modell zur präklinischen Testung anti-inflammatorischer Substanzen im Weißbüschelaffen (Callitrix jacchus). Pneumologie 2013. [DOI: 10.1055/s-0033-1334803] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
90
|
Curths C, Becker T, Kaup FJ, Schlumbohm C, Sewald K, Hohlfeld JM, Dunker S, Braun A, Knauf S. Ein translationales Tiermodell für das allergische Asthma des Menschen im Weißbüschelaffen (Callithrix jacchus). Pneumologie 2013. [DOI: 10.1055/s-0033-1334802] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
91
|
Switalla S, Knebel J, Ritter D, Dasenbrock C, Krug N, Braun A, Sewald K. Determination of genotoxicity by the Comet assay applied to murine precision-cut lung slices. Toxicol In Vitro 2012; 27:798-803. [PMID: 23274917 DOI: 10.1016/j.tiv.2012.12.015] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2012] [Revised: 12/10/2012] [Accepted: 12/13/2012] [Indexed: 12/30/2022]
Abstract
Precision-cut lung slices (PCLSs) are an organotypic lung model that is widely used in pharmacological, physiological, and toxicological studies. Genotoxicity testing, as a pivotal part of early risk assessment, is currently established in vivo in various organs including lung, brain, or liver, and in vitro in cell lines or primary cells. The aim of the present study was to provide the three-dimensional organ culture PCLS as a new ex vivo model for determination of genotoxicity using the Comet assay. Murine PCLS were exposed to increasing concentrations of ethyl methane sulfonate 'EMS' (0.03-0.4%) and formalin (0.5-5mM). Tissue was subsequently dissociated, and DNA single-strand breaks were quantified using the Comet assay. Number of viable dissociated lung cells was between 4×10(5) and 6.7×10(5)cells/slice. Even treatment with EMS did not induce toxicity compared to untreated tissue control. As expected, DNA single-strand breaks were increased dose-dependently and significantly after exposure to EMS. Here, tail length rose from 24μm to 75μm. In contrast, formalin resulted in a significant induction of DNA cross-links. The effects induced by EMS and formalin demonstrate the usefulness of PCLS as a new ex vivo lung model for genotoxicity testing in the early risk assessment of airborne substances in the future.
Collapse
|
92
|
Braun A, Novelli A, Vieira B, Espindola E. Ecotoxicological effects of Vertimec® 18EC on plankton. ACTA ACUST UNITED AC 2012. [DOI: 10.5132/jbse.2012.02.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
93
|
Fischer A, Bausch D, Baier P, Braun A, Richter-Schrag H. Risk of biodegradable stent-induced hypergranulation causing re-stenosis of a gastric conduit after esophageal resection. Endoscopy 2012; 44 Suppl 2 UCTN:E125-6. [PMID: 22477178 DOI: 10.1055/s-0031-1291693] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
|
94
|
Coleman R, Barrios C, Bell R, Finkelstein D, Iwata H, Martin M, Braun A, Ke C, Maniar T, Goss P. Denosumab Versus Placebo as Adjuvant Treatment for Women With Early-Stage Breast Cancer at High Risk of Disease Recurrence (D-CARE): An in Progress, Phase 3 Clinical Trial. Ann Oncol 2012. [DOI: 10.1016/s0923-7534(20)32883-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
|
95
|
Braun A, Egger F, Koch K, Briesen H. CFD-Simulation der Strömung einer Herschel-Bulkley-Flüssigkeit in einem Pfropfenstromfermenter. CHEM-ING-TECH 2012. [DOI: 10.1002/cite.201250325] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
96
|
Mayer G, Fitzpatrick G, Frey G, Wigginton H, Woodhead S, Cleeland C, Qian Y, Braun A, Chung K. 14 Addressing Pain in Patients with Solid Tumours and Bone Metastases Receiving the Bone-targeted Therapies Denosumab or Zoledronic Acid. Eur J Oncol Nurs 2012. [DOI: 10.1016/s1462-3889(12)70029-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
|
97
|
Stopeck A, Richardson G, Siena S, Lipton A, Brown J, Fizazi K, Henry D, Saad F, Ke C, Braun A. AOS13 Denosumab versus zoledronic acid for the prevention of skeletal-related events in patients with bone metastases secondary to solid tumours: An integrated analysis of three phase 3 studies. Eur J Cancer 2012. [DOI: 10.1016/j.ejca.2012.02.030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
|
98
|
Stopeck A, Lipton A, Martín M, Body JJ, Paterson A, Steger G, Tonkin K, de Boer R, Fujiwara Y, Yardley D, Jassem J, Takano T, Solal-Céligny P, Fan M, Braun A. AOSOP6 Results from the 2-year open-label extension treatment phase of a pivotal phase 3 study of denosumab in patients with breast cancer and bone metastases previously treated with zoledronic acid or denosumab. Eur J Cancer 2012. [DOI: 10.1016/j.ejca.2012.02.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
|
99
|
Ramanathan G, Gupta S, Thielmann I, Pleines I, Varga-Szabo D, May F, Mannhalter C, Dietrich A, Nieswandt B, Braun A. Defective diacylglycerol-induced Ca2+ entry but normal agonist-induced activation responses in TRPC6-deficient mouse platelets. J Thromb Haemost 2012; 10:419-29. [PMID: 22176814 DOI: 10.1111/j.1538-7836.2011.04596.x] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
BACKGROUND Platelet adhesion, activation and aggregation at sites of vascular injury are essential processes for primary hemostasis. Elevation of the intracellular Ca(2+) concentration is a central event in platelet activation but the underlying mechanisms are not fully understood. Store-operated calcium entry (SOCE) through Orai1 was shown to be the main Ca(2+) influx pathway in murine platelets, but there are additional non-store-operated Ca(2+) (non-SOC) and receptor operated Ca(2+) (ROC) channels expressed in the platelet plasma membrane. OBJECTIVE Canonical transient receptor potential (TRPC) channel 6 is found both in human and murine platelets and has been proposed to mediate diacylglycerol (DAG) activated ROCE but also a role in the regulation of SOCE has been suggested. METHODS To investigate the function of TRPC6 in platelet Ca(2+) signaling and activation, we analyzed platelets from mice deficient in TRPC6 using a wide range of in vitro and in vivo assays. RESULTS In the mutant platelets, DAG activated Ca(2+) influx was found to be abolished. However, this did not significantly affect SOCE or agonist induced Ca(2+) responses. Platelet function in vitro and in vivo was also unaltered in the absence of TRPC6. CONCLUSION Our results indicate that DAG activated ROCE is mediated exclusively by TRPC6 in murine platelets, but this Ca(2+) influx has no major functional relevance for hemostasis and thrombosis. Further, in contrast to previous suggestions, based on studies with human platelets, TRPC6 appears to play an insignificant role in the regulation of SOCE in murine platelets.
Collapse
|
100
|
Kupfer J, Gieler U, Braun A, Niemeier V, Huzler C, Renz H. Stress and Atopic Eczema. Int Arch Allergy Immunol 2012. [DOI: 10.1159/000053755] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
|